Merge Linus' tree.

96 files changed, 2771 insertions, 1996 deletions

diff --git a/fs/9p/9p.c b/fs/9p/9p.c
index e847f504a47c7e..1a6d08761f3942 100644
--- a/fs/9p/9p.c
+++ b/fs/9p/9p.c
@@ -1,8 +1,9 @@
 /*
  *  linux/fs/9p/9p.c
  *
- *  This file contains functions 9P2000 functions
+ *  This file contains functions to perform synchronous 9P calls
  *
+ *  Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  *
@@ -33,6 +34,7 @@
 #include "debug.h"
 #include "v9fs.h"
 #include "9p.h"
+#include "conv.h"
 #include "mux.h"
 
 /**
@@ -46,16 +48,21 @@
 
 int
 v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
-	       char *version, struct v9fs_fcall **fcall)
+	       char *version, struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall *tc;
 
 	dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
-	msg.id = TVERSION;
-	msg.params.tversion.msize = msize;
-	msg.params.tversion.version = version;
+	tc = v9fs_create_tversion(msize, version);
 
-	return v9fs_mux_rpc(v9ses, &msg, fcall);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
+
+	return ret;
 }
 
 /**
@@ -71,19 +78,45 @@ v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
 
 int
 v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
-	      u32 fid, u32 afid, struct v9fs_fcall **fcall)
+	      u32 fid, u32 afid, struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall* tc;
 
 	dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
 		aname, fid, afid);
-	msg.id = TATTACH;
-	msg.params.tattach.fid = fid;
-	msg.params.tattach.afid = afid;
-	msg.params.tattach.uname = uname;
-	msg.params.tattach.aname = aname;
 
-	return v9fs_mux_rpc(v9ses, &msg, fcall);
+	tc = v9fs_create_tattach(fid, afid, uname, aname);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
+
+	return ret;
+}
+
+static void v9fs_t_clunk_cb(void *a, struct v9fs_fcall *tc,
+	struct v9fs_fcall *rc, int err)
+{
+	int fid;
+	struct v9fs_session_info *v9ses;
+
+	if (err)
+		return;
+
+	fid = tc->params.tclunk.fid;
+	kfree(tc);
+
+	if (!rc)
+		return;
+
+	dprintk(DEBUG_9P, "tcall id %d rcall id %d\n", tc->id, rc->id);
+	v9ses = a;
+	if (rc->id == RCLUNK)
+		v9fs_put_idpool(fid, &v9ses->fidpool);
+
+	kfree(rc);
 }
 
 /**
@@ -95,16 +128,25 @@ v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
  */
 
 int
-v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid,
-	     struct v9fs_fcall **fcall)
+v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall *tc, *rc;
 
 	dprintk(DEBUG_9P, "fid %d\n", fid);
-	msg.id = TCLUNK;
-	msg.params.tclunk.fid = fid;
 
-	return v9fs_mux_rpc(v9ses, &msg, fcall);
+	rc = NULL;
+	tc = v9fs_create_tclunk(fid);
+	if (!IS_ERR(tc))
+		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
+	else
+		ret = PTR_ERR(tc);
+
+	if (ret)
+		dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret);
+
+	v9fs_t_clunk_cb(v9ses, tc, rc, ret);
+	return ret;
 }
 
 /**
@@ -114,14 +156,21 @@ v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid,
  *
  */
 
-int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 tag)
+int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall *tc;
+
+	dprintk(DEBUG_9P, "oldtag %d\n", oldtag);
+
+	tc = v9fs_create_tflush(oldtag);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, NULL);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
 
-	dprintk(DEBUG_9P, "oldtag %d\n", tag);
-	msg.id = TFLUSH;
-	msg.params.tflush.oldtag = tag;
-	return v9fs_mux_rpc(v9ses, &msg, NULL);
+	return ret;
 }
 
 /**
@@ -133,17 +182,22 @@ int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 tag)
  */
 
 int
-v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **fcall)
+v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall *tc;
 
 	dprintk(DEBUG_9P, "fid %d\n", fid);
-	if (fcall)
-		*fcall = NULL;
 
-	msg.id = TSTAT;
-	msg.params.tstat.fid = fid;
-	return v9fs_mux_rpc(v9ses, &msg, fcall);
+	ret = -ENOMEM;
+	tc = v9fs_create_tstat(fid);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
+
+	return ret;
 }
 
 /**
@@ -157,16 +211,21 @@ v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **fcall)
 
 int
 v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
-	     struct v9fs_stat *stat, struct v9fs_fcall **fcall)
+	     struct v9fs_wstat *wstat, struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall *tc;
+
+	dprintk(DEBUG_9P, "fid %d\n", fid);
 
-	dprintk(DEBUG_9P, "fid %d length %d\n", fid, (int)stat->length);
-	msg.id = TWSTAT;
-	msg.params.twstat.fid = fid;
-	msg.params.twstat.stat = stat;
+	tc = v9fs_create_twstat(fid, wstat, v9ses->extended);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
 
-	return v9fs_mux_rpc(v9ses, &msg, fcall);
+	return ret;
 }
 
 /**
@@ -183,23 +242,27 @@ v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
 
 int
 v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
-	    char *name, struct v9fs_fcall **fcall)
+	    char *name, struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall *tc;
+	int nwname;
 
 	dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
-	msg.id = TWALK;
-	msg.params.twalk.fid = fid;
-	msg.params.twalk.newfid = newfid;
-
-	if (name) {
-		msg.params.twalk.nwname = 1;
-		msg.params.twalk.wnames = &name;
-	} else {
-		msg.params.twalk.nwname = 0;
-	}
-
-	return v9fs_mux_rpc(v9ses, &msg, fcall);
+
+	if (name)
+		nwname = 1;
+	else
+		nwname = 0;
+
+	tc = v9fs_create_twalk(fid, newfid, nwname, &name);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
+
+	return ret;
 }
 
 /**
@@ -214,19 +277,21 @@ v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
 
 int
 v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
-	    struct v9fs_fcall **fcall)
+	    struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
-	long errorno = -1;
+	int ret;
+	struct v9fs_fcall *tc;
 
 	dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
-	msg.id = TOPEN;
-	msg.params.topen.fid = fid;
-	msg.params.topen.mode = mode;
 
-	errorno = v9fs_mux_rpc(v9ses, &msg, fcall);
+	tc = v9fs_create_topen(fid, mode);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
 
-	return errorno;
+	return ret;
 }
 
 /**
@@ -239,14 +304,21 @@ v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
 
 int
 v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
-	      struct v9fs_fcall **fcall)
+	      struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall *tc;
 
 	dprintk(DEBUG_9P, "fid %d\n", fid);
-	msg.id = TREMOVE;
-	msg.params.tremove.fid = fid;
-	return v9fs_mux_rpc(v9ses, &msg, fcall);
+
+	tc = v9fs_create_tremove(fid);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
+
+	return ret;
 }
 
 /**
@@ -262,20 +334,22 @@ v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
 
 int
 v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
-	      u32 perm, u8 mode, struct v9fs_fcall **fcall)
+	      u32 perm, u8 mode, struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
+	int ret;
+	struct v9fs_fcall *tc;
 
 	dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
 		fid, name, perm, mode);
 
-	msg.id = TCREATE;
-	msg.params.tcreate.fid = fid;
-	msg.params.tcreate.name = name;
-	msg.params.tcreate.perm = perm;
-	msg.params.tcreate.mode = mode;
+	tc = v9fs_create_tcreate(fid, name, perm, mode);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
 
-	return v9fs_mux_rpc(v9ses, &msg, fcall);
+	return ret;
 }
 
 /**
@@ -290,31 +364,29 @@ v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
 
 int
 v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
-	    u32 count, struct v9fs_fcall **fcall)
+	    u32 count, struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
-	struct v9fs_fcall *rc = NULL;
-	long errorno = -1;
-
-	dprintk(DEBUG_9P, "fid %d offset 0x%lx count 0x%x\n", fid,
-		(long unsigned int)offset, count);
-	msg.id = TREAD;
-	msg.params.tread.fid = fid;
-	msg.params.tread.offset = offset;
-	msg.params.tread.count = count;
-	errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
-
-	if (!errorno) {
-		errorno = rc->params.rread.count;
-		dump_data(rc->params.rread.data, rc->params.rread.count);
-	}
-
-	if (fcall)
-		*fcall = rc;
-	else
-		kfree(rc);
-
-	return errorno;
+	int ret;
+	struct v9fs_fcall *tc, *rc;
+
+	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
+		(long long unsigned) offset, count);
+
+	tc = v9fs_create_tread(fid, offset, count);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
+		if (!ret)
+			ret = rc->params.rread.count;
+		if (rcp)
+			*rcp = rc;
+		else
+			kfree(rc);
+
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
+
+	return ret;
 }
 
 /**
@@ -328,32 +400,30 @@ v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
  */
 
 int
-v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid,
-	     u64 offset, u32 count, void *data, struct v9fs_fcall **fcall)
+v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset, u32 count,
+	const char __user *data, struct v9fs_fcall **rcp)
 {
-	struct v9fs_fcall msg;
-	struct v9fs_fcall *rc = NULL;
-	long errorno = -1;
+	int ret;
+	struct v9fs_fcall *tc, *rc;
 
-	dprintk(DEBUG_9P, "fid %d offset 0x%llx count 0x%x\n", fid,
-		(unsigned long long)offset, count);
-	dump_data(data, count);
+	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
+		(long long unsigned) offset, count);
 
-	msg.id = TWRITE;
-	msg.params.twrite.fid = fid;
-	msg.params.twrite.offset = offset;
-	msg.params.twrite.count = count;
-	msg.params.twrite.data = data;
+	tc = v9fs_create_twrite(fid, offset, count, data);
+	if (!IS_ERR(tc)) {
+		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
 
-	errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
+		if (!ret)
+			ret = rc->params.rwrite.count;
+		if (rcp)
+			*rcp = rc;
+		else
+			kfree(rc);
 
-	if (!errorno)
-		errorno = rc->params.rwrite.count;
+		kfree(tc);
+	} else
+		ret = PTR_ERR(tc);
 
-	if (fcall)
-		*fcall = rc;
-	else
-		kfree(rc);
-
-	return errorno;
+	return ret;
 }
+
diff --git a/fs/9p/9p.h b/fs/9p/9p.h
index f55424216be236..0cd374d94717f0 100644
--- a/fs/9p/9p.h
+++ b/fs/9p/9p.h
@@ -3,6 +3,7 @@
  *
  * 9P protocol definitions.
  *
+ *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  *
@@ -100,9 +101,18 @@ enum {
 	V9FS_QTFILE = 0x00,
 };
 
+#define V9FS_NOTAG	(u16)(~0)
+#define V9FS_NOFID	(u32)(~0)
+#define V9FS_MAXWELEM	16
+
 /* ample room for Twrite/Rread header (iounit) */
 #define V9FS_IOHDRSZ	24
 
+struct v9fs_str {
+	u16 len;
+	char *str;
+};
+
 /* qids are the unique ID for a file (like an inode */
 struct v9fs_qid {
 	u8 type;
@@ -120,6 +130,29 @@ struct v9fs_stat {
 	u32 atime;
 	u32 mtime;
 	u64 length;
+	struct v9fs_str name;
+	struct v9fs_str uid;
+	struct v9fs_str gid;
+	struct v9fs_str muid;
+	struct v9fs_str extension;	/* 9p2000.u extensions */
+	u32 n_uid;		/* 9p2000.u extensions */
+	u32 n_gid;		/* 9p2000.u extensions */
+	u32 n_muid;		/* 9p2000.u extensions */
+};
+
+/* file metadata (stat) structure used to create Twstat message
+   The is similar to v9fs_stat, but the strings don't point to
+   the same memory block and should be freed separately
+*/
+struct v9fs_wstat {
+	u16 size;
+	u16 type;
+	u32 dev;
+	struct v9fs_qid qid;
+	u32 mode;
+	u32 atime;
+	u32 mtime;
+	u64 length;
 	char *name;
 	char *uid;
 	char *gid;
@@ -128,25 +161,24 @@ struct v9fs_stat {
 	u32 n_uid;		/* 9p2000.u extensions */
 	u32 n_gid;		/* 9p2000.u extensions */
 	u32 n_muid;		/* 9p2000.u extensions */
-	char data[0];
 };
 
 /* Structures for Protocol Operations */
 
 struct Tversion {
 	u32 msize;
-	char *version;
+	struct v9fs_str version;
 };
 
 struct Rversion {
 	u32 msize;
-	char *version;
+	struct v9fs_str version;
 };
 
 struct Tauth {
 	u32 afid;
-	char *uname;
-	char *aname;
+	struct v9fs_str uname;
+	struct v9fs_str aname;
 };
 
 struct Rauth {
@@ -154,12 +186,12 @@ struct Rauth {
 };
 
 struct Rerror {
-	char *error;
+	struct v9fs_str error;
 	u32 errno;		/* 9p2000.u extension */
 };
 
 struct Tflush {
-	u32 oldtag;
+	u16 oldtag;
 };
 
 struct Rflush {
@@ -168,8 +200,8 @@ struct Rflush {
 struct Tattach {
 	u32 fid;
 	u32 afid;
-	char *uname;
-	char *aname;
+	struct v9fs_str uname;
+	struct v9fs_str aname;
 };
 
 struct Rattach {
@@ -179,13 +211,13 @@ struct Rattach {
 struct Twalk {
 	u32 fid;
 	u32 newfid;
-	u32 nwname;
-	char **wnames;
+	u16 nwname;
+	struct v9fs_str wnames[16];
 };
 
 struct Rwalk {
-	u32 nwqid;
-	struct v9fs_qid *wqids;
+	u16 nwqid;
+	struct v9fs_qid wqids[16];
 };
 
 struct Topen {
@@ -200,7 +232,7 @@ struct Ropen {
 
 struct Tcreate {
 	u32 fid;
-	char *name;
+	struct v9fs_str name;
 	u32 perm;
 	u8 mode;
 };
@@ -251,12 +283,12 @@ struct Tstat {
 };
 
 struct Rstat {
-	struct v9fs_stat *stat;
+	struct v9fs_stat stat;
 };
 
 struct Twstat {
 	u32 fid;
-	struct v9fs_stat *stat;
+	struct v9fs_stat stat;
 };
 
 struct Rwstat {
@@ -271,6 +303,7 @@ struct v9fs_fcall {
 	u32 size;
 	u8 id;
 	u16 tag;
+	void *sdata;
 
 	union {
 		struct Tversion tversion;
@@ -303,7 +336,9 @@ struct v9fs_fcall {
 	} params;
 };
 
-#define FCALL_ERROR(fcall) (fcall ? fcall->params.rerror.error : "")
+#define PRINT_FCALL_ERROR(s, fcall) dprintk(DEBUG_ERROR, "%s: %.*s\n", s, \
+	fcall?fcall->params.rerror.error.len:0, \
+	fcall?fcall->params.rerror.error.str:"");
 
 int v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
 		   char *version, struct v9fs_fcall **rcall);
@@ -311,8 +346,7 @@ int v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
 int v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
 		  u32 fid, u32 afid, struct v9fs_fcall **rcall);
 
-int v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid,
-		 struct v9fs_fcall **rcall);
+int v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid);
 
 int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag);
 
@@ -320,7 +354,7 @@ int v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid,
 		struct v9fs_fcall **rcall);
 
 int v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
-		 struct v9fs_stat *stat, struct v9fs_fcall **rcall);
+		 struct v9fs_wstat *wstat, struct v9fs_fcall **rcall);
 
 int v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
 		char *name, struct v9fs_fcall **rcall);
@@ -338,4 +372,5 @@ int v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid,
 		u64 offset, u32 count, struct v9fs_fcall **rcall);
 
 int v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
-		 u32 count, void *data, struct v9fs_fcall **rcall);
+		 u32 count, const char __user * data,
+		 struct v9fs_fcall **rcall);
diff --git a/fs/9p/Makefile b/fs/9p/Makefile
index e4e4ffe5a7dc50..3d023089707efe 100644
--- a/fs/9p/Makefile
+++ b/fs/9p/Makefile
@@ -1,17 +1,17 @@
 obj-$(CONFIG_9P_FS) := 9p2000.o
 
 9p2000-objs := \
+	trans_fd.o \
+	trans_sock.o \
+	mux.o \
+	9p.o \
+	conv.o \
 	vfs_super.o \
 	vfs_inode.o \
 	vfs_file.o \
 	vfs_dir.o \
 	vfs_dentry.o \
 	error.o \
-	mux.o \
-	trans_fd.o \
-	trans_sock.o \
-	9p.o \
-	conv.o \
 	v9fs.o \
 	fid.o
 
diff --git a/fs/9p/conv.c b/fs/9p/conv.c
index 18121af99d3ef1..55ccfa10ee9eee 100644
--- a/fs/9p/conv.c
+++ b/fs/9p/conv.c
@@ -30,7 +30,7 @@
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/idr.h>
-
+#include <asm/uaccess.h>
 #include "debug.h"
 #include "v9fs.h"
 #include "9p.h"
@@ -58,12 +58,15 @@ static inline int buf_check_overflow(struct cbuf *buf)
 
 static inline int buf_check_size(struct cbuf *buf, int len)
 {
-	if (buf->p+len > buf->ep) {
+	if (buf->p + len > buf->ep) {
 		if (buf->p < buf->ep) {
-			eprintk(KERN_ERR, "buffer overflow\n");
+			eprintk(KERN_ERR, "buffer overflow: want %d has %d\n",
+				len, (int)(buf->ep - buf->p));
+			dump_stack();
 			buf->p = buf->ep + 1;
-			return 0;
 		}
+
+		return 0;
 	}
 
 	return 1;
@@ -127,14 +130,6 @@ static inline void buf_put_string(struct cbuf *buf, const char *s)
 	buf_put_stringn(buf, s, strlen(s));
 }
 
-static inline void buf_put_data(struct cbuf *buf, void *data, u32 datalen)
-{
-	if (buf_check_size(buf, datalen)) {
-		memcpy(buf->p, data, datalen);
-		buf->p += datalen;
-	}
-}
-
 static inline u8 buf_get_int8(struct cbuf *buf)
 {
 	u8 ret = 0;
@@ -183,86 +178,37 @@ static inline u64 buf_get_int64(struct cbuf *buf)
 	return ret;
 }
 
-static inline int
-buf_get_string(struct cbuf *buf, char *data, unsigned int datalen)
-{
-	u16 len = 0;
-
-	len = buf_get_int16(buf);
-	if (!buf_check_overflow(buf) && buf_check_size(buf, len) && len+1>datalen) {
-		memcpy(data, buf->p, len);
-		data[len] = 0;
-		buf->p += len;
-		len++;
-	}
-
-	return len;
-}
-
-static inline char *buf_get_stringb(struct cbuf *buf, struct cbuf *sbuf)
-{
-	char *ret;
-	u16 len;
-
-	ret = NULL;
-	len = buf_get_int16(buf);
-
-	if (!buf_check_overflow(buf) && buf_check_size(buf, len) &&
-		buf_check_size(sbuf, len+1)) {
-
-		memcpy(sbuf->p, buf->p, len);
-		sbuf->p[len] = 0;
-		ret = sbuf->p;
-		buf->p += len;
-		sbuf->p += len + 1;
-	}
-
-	return ret;
-}
-
-static inline int buf_get_data(struct cbuf *buf, void *data, int datalen)
+static inline void buf_get_str(struct cbuf *buf, struct v9fs_str *vstr)
 {
-	int ret = 0;
-
-	if (buf_check_size(buf, datalen)) {
-		memcpy(data, buf->p, datalen);
-		buf->p += datalen;
-		ret = datalen;
+	vstr->len = buf_get_int16(buf);
+	if (!buf_check_overflow(buf) && buf_check_size(buf, vstr->len)) {
+		vstr->str = buf->p;
+		buf->p += vstr->len;
+	} else {
+		vstr->len = 0;
+		vstr->str = NULL;
 	}
-
-	return ret;
 }
 
-static inline void *buf_get_datab(struct cbuf *buf, struct cbuf *dbuf,
-				  int datalen)
+static inline void buf_get_qid(struct cbuf *bufp, struct v9fs_qid *qid)
 {
-	char *ret = NULL;
-	int n = 0;
-
-	if (buf_check_size(dbuf, datalen)) {
-		n = buf_get_data(buf, dbuf->p, datalen);
-		if (n > 0) {
-			ret = dbuf->p;
-			dbuf->p += n;
-		}
-	}
-
-	return ret;
+	qid->type = buf_get_int8(bufp);
+	qid->version = buf_get_int32(bufp);
+	qid->path = buf_get_int64(bufp);
 }
 
 /**
- * v9fs_size_stat - calculate the size of a variable length stat struct
- * @v9ses: session information
+ * v9fs_size_wstat - calculate the size of a variable length stat struct
  * @stat: metadata (stat) structure
+ * @extended: non-zero if 9P2000.u
  *
  */
 
-static int v9fs_size_stat(struct v9fs_session_info *v9ses,
-			  struct v9fs_stat *stat)
+static int v9fs_size_wstat(struct v9fs_wstat *wstat, int extended)
 {
 	int size = 0;
 
-	if (stat == NULL) {
+	if (wstat == NULL) {
 		eprintk(KERN_ERR, "v9fs_size_stat: got a NULL stat pointer\n");
 		return 0;
 	}
@@ -279,82 +225,38 @@ static int v9fs_size_stat(struct v9fs_session_info *v9ses,
 	    8 +			/* length[8] */
 	    8;			/* minimum sum of string lengths */
 
-	if (stat->name)
-		size += strlen(stat->name);
-	if (stat->uid)
-		size += strlen(stat->uid);
-	if (stat->gid)
-		size += strlen(stat->gid);
-	if (stat->muid)
-		size += strlen(stat->muid);
+	if (wstat->name)
+		size += strlen(wstat->name);
+	if (wstat->uid)
+		size += strlen(wstat->uid);
+	if (wstat->gid)
+		size += strlen(wstat->gid);
+	if (wstat->muid)
+		size += strlen(wstat->muid);
 
-	if (v9ses->extended) {
+	if (extended) {
 		size += 4 +	/* n_uid[4] */
 		    4 +		/* n_gid[4] */
 		    4 +		/* n_muid[4] */
 		    2;		/* string length of extension[4] */
-		if (stat->extension)
-			size += strlen(stat->extension);
+		if (wstat->extension)
+			size += strlen(wstat->extension);
 	}
 
 	return size;
 }
 
 /**
- * serialize_stat - safely format a stat structure for transmission
- * @v9ses: session info
- * @stat: metadata (stat) structure
- * @bufp: buffer to serialize structure into
- *
- */
-
-static int
-serialize_stat(struct v9fs_session_info *v9ses, struct v9fs_stat *stat,
-	       struct cbuf *bufp)
-{
-	buf_put_int16(bufp, stat->size);
-	buf_put_int16(bufp, stat->type);
-	buf_put_int32(bufp, stat->dev);
-	buf_put_int8(bufp, stat->qid.type);
-	buf_put_int32(bufp, stat->qid.version);
-	buf_put_int64(bufp, stat->qid.path);
-	buf_put_int32(bufp, stat->mode);
-	buf_put_int32(bufp, stat->atime);
-	buf_put_int32(bufp, stat->mtime);
-	buf_put_int64(bufp, stat->length);
-
-	buf_put_string(bufp, stat->name);
-	buf_put_string(bufp, stat->uid);
-	buf_put_string(bufp, stat->gid);
-	buf_put_string(bufp, stat->muid);
-
-	if (v9ses->extended) {
-		buf_put_string(bufp, stat->extension);
-		buf_put_int32(bufp, stat->n_uid);
-		buf_put_int32(bufp, stat->n_gid);
-		buf_put_int32(bufp, stat->n_muid);
-	}
-
-	if (buf_check_overflow(bufp))
-		return 0;
-
-	return stat->size;
-}
-
-/**
- * deserialize_stat - safely decode a recieved metadata (stat) structure
- * @v9ses: session info
+ * buf_get_stat - safely decode a recieved metadata (stat) structure
  * @bufp: buffer to deserialize
  * @stat: metadata (stat) structure
- * @dbufp: buffer to deserialize variable strings into
+ * @extended: non-zero if 9P2000.u
  *
  */
 
-static inline int
-deserialize_stat(struct v9fs_session_info *v9ses, struct cbuf *bufp,
-		 struct v9fs_stat *stat, struct cbuf *dbufp)
+static inline void
+buf_get_stat(struct cbuf *bufp, struct v9fs_stat *stat, int extended)
 {
-
 	stat->size = buf_get_int16(bufp);
 	stat->type = buf_get_int16(bufp);
 	stat->dev = buf_get_int32(bufp);
@@ -365,282 +267,82 @@ deserialize_stat(struct v9fs_session_info *v9ses, struct cbuf *bufp,
 	stat->atime = buf_get_int32(bufp);
 	stat->mtime = buf_get_int32(bufp);
 	stat->length = buf_get_int64(bufp);
-	stat->name = buf_get_stringb(bufp, dbufp);
-	stat->uid = buf_get_stringb(bufp, dbufp);
-	stat->gid = buf_get_stringb(bufp, dbufp);
-	stat->muid = buf_get_stringb(bufp, dbufp);
+	buf_get_str(bufp, &stat->name);
+	buf_get_str(bufp, &stat->uid);
+	buf_get_str(bufp, &stat->gid);
+	buf_get_str(bufp, &stat->muid);
 
-	if (v9ses->extended) {
-		stat->extension = buf_get_stringb(bufp, dbufp);
+	if (extended) {
+		buf_get_str(bufp, &stat->extension);
 		stat->n_uid = buf_get_int32(bufp);
 		stat->n_gid = buf_get_int32(bufp);
 		stat->n_muid = buf_get_int32(bufp);
 	}
-
-	if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
-		return 0;
-
-	return stat->size + 2;
-}
-
-/**
- * deserialize_statb - wrapper for decoding a received metadata structure
- * @v9ses: session info
- * @bufp: buffer to deserialize
- * @dbufp: buffer to deserialize variable strings into
- *
- */
-
-static inline struct v9fs_stat *deserialize_statb(struct v9fs_session_info
-						  *v9ses, struct cbuf *bufp,
-						  struct cbuf *dbufp)
-{
-	struct v9fs_stat *ret = buf_alloc(dbufp, sizeof(struct v9fs_stat));
-
-	if (ret) {
-		int n = deserialize_stat(v9ses, bufp, ret, dbufp);
-		if (n <= 0)
-			return NULL;
-	}
-
-	return ret;
 }
 
 /**
  * v9fs_deserialize_stat - decode a received metadata structure
- * @v9ses: session info
  * @buf: buffer to deserialize
  * @buflen: length of received buffer
  * @stat: metadata structure to decode into
- * @statlen: length of destination metadata structure
+ * @extended: non-zero if 9P2000.u
  *
+ * Note: stat will point to the buf region.
  */
 
 int
-v9fs_deserialize_stat(struct v9fs_session_info *v9ses, void *buf,
-		      u32 buflen, struct v9fs_stat *stat, u32 statlen)
+v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
+		int extended)
 {
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
-	struct cbuf dbuffer;
-	struct cbuf *dbufp = &dbuffer;
+	unsigned char *p;
 
 	buf_init(bufp, buf, buflen);
-	buf_init(dbufp, (char *)stat + sizeof(struct v9fs_stat),
-		 statlen - sizeof(struct v9fs_stat));
-
-	return deserialize_stat(v9ses, bufp, stat, dbufp);
-}
-
-static inline int
-v9fs_size_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall)
-{
-	int size = 4 + 1 + 2;	/* size[4] msg[1] tag[2] */
-	int i = 0;
-
-	switch (fcall->id) {
-	default:
-		eprintk(KERN_ERR, "bad msg type %d\n", fcall->id);
-		return 0;
-	case TVERSION:		/* msize[4] version[s] */
-		size += 4 + 2 + strlen(fcall->params.tversion.version);
-		break;
-	case TAUTH:		/* afid[4] uname[s] aname[s] */
-		size += 4 + 2 + strlen(fcall->params.tauth.uname) +
-		    2 + strlen(fcall->params.tauth.aname);
-		break;
-	case TFLUSH:		/* oldtag[2] */
-		size += 2;
-		break;
-	case TATTACH:		/* fid[4] afid[4] uname[s] aname[s] */
-		size += 4 + 4 + 2 + strlen(fcall->params.tattach.uname) +
-		    2 + strlen(fcall->params.tattach.aname);
-		break;
-	case TWALK:		/* fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
-		size += 4 + 4 + 2;
-		/* now compute total for the array of names */
-		for (i = 0; i < fcall->params.twalk.nwname; i++)
-			size += 2 + strlen(fcall->params.twalk.wnames[i]);
-		break;
-	case TOPEN:		/* fid[4] mode[1] */
-		size += 4 + 1;
-		break;
-	case TCREATE:		/* fid[4] name[s] perm[4] mode[1] */
-		size += 4 + 2 + strlen(fcall->params.tcreate.name) + 4 + 1;
-		break;
-	case TREAD:		/* fid[4] offset[8] count[4] */
-		size += 4 + 8 + 4;
-		break;
-	case TWRITE:		/* fid[4] offset[8] count[4] data[count] */
-		size += 4 + 8 + 4 + fcall->params.twrite.count;
-		break;
-	case TCLUNK:		/* fid[4] */
-		size += 4;
-		break;
-	case TREMOVE:		/* fid[4] */
-		size += 4;
-		break;
-	case TSTAT:		/* fid[4] */
-		size += 4;
-		break;
-	case TWSTAT:		/* fid[4] stat[n] */
-		fcall->params.twstat.stat->size =
-		    v9fs_size_stat(v9ses, fcall->params.twstat.stat);
-		size += 4 + 2 + 2 + fcall->params.twstat.stat->size;
-	}
-	return size;
-}
-
-/*
- * v9fs_serialize_fcall - marshall fcall struct into a packet
- * @v9ses: session information
- * @fcall: structure to convert
- * @data: buffer to serialize fcall into
- * @datalen: length of buffer to serialize fcall into
- *
- */
-
-int
-v9fs_serialize_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall,
-		     void *data, u32 datalen)
-{
-	int i = 0;
-	struct v9fs_stat *stat = NULL;
-	struct cbuf buffer;
-	struct cbuf *bufp = &buffer;
-
-	buf_init(bufp, data, datalen);
-
-	if (!fcall) {
-		eprintk(KERN_ERR, "no fcall\n");
-		return -EINVAL;
-	}
-
-	fcall->size = v9fs_size_fcall(v9ses, fcall);
-
-	buf_put_int32(bufp, fcall->size);
-	buf_put_int8(bufp, fcall->id);
-	buf_put_int16(bufp, fcall->tag);
-
-	dprintk(DEBUG_CONV, "size %d id %d tag %d\n", fcall->size, fcall->id,
-		fcall->tag);
-
-	/* now encode it */
-	switch (fcall->id) {
-	default:
-		eprintk(KERN_ERR, "bad msg type: %d\n", fcall->id);
-		return -EPROTO;
-	case TVERSION:
-		buf_put_int32(bufp, fcall->params.tversion.msize);
-		buf_put_string(bufp, fcall->params.tversion.version);
-		break;
-	case TAUTH:
-		buf_put_int32(bufp, fcall->params.tauth.afid);
-		buf_put_string(bufp, fcall->params.tauth.uname);
-		buf_put_string(bufp, fcall->params.tauth.aname);
-		break;
-	case TFLUSH:
-		buf_put_int16(bufp, fcall->params.tflush.oldtag);
-		break;
-	case TATTACH:
-		buf_put_int32(bufp, fcall->params.tattach.fid);
-		buf_put_int32(bufp, fcall->params.tattach.afid);
-		buf_put_string(bufp, fcall->params.tattach.uname);
-		buf_put_string(bufp, fcall->params.tattach.aname);
-		break;
-	case TWALK:
-		buf_put_int32(bufp, fcall->params.twalk.fid);
-		buf_put_int32(bufp, fcall->params.twalk.newfid);
-		buf_put_int16(bufp, fcall->params.twalk.nwname);
-		for (i = 0; i < fcall->params.twalk.nwname; i++)
-			buf_put_string(bufp, fcall->params.twalk.wnames[i]);
-		break;
-	case TOPEN:
-		buf_put_int32(bufp, fcall->params.topen.fid);
-		buf_put_int8(bufp, fcall->params.topen.mode);
-		break;
-	case TCREATE:
-		buf_put_int32(bufp, fcall->params.tcreate.fid);
-		buf_put_string(bufp, fcall->params.tcreate.name);
-		buf_put_int32(bufp, fcall->params.tcreate.perm);
-		buf_put_int8(bufp, fcall->params.tcreate.mode);
-		break;
-	case TREAD:
-		buf_put_int32(bufp, fcall->params.tread.fid);
-		buf_put_int64(bufp, fcall->params.tread.offset);
-		buf_put_int32(bufp, fcall->params.tread.count);
-		break;
-	case TWRITE:
-		buf_put_int32(bufp, fcall->params.twrite.fid);
-		buf_put_int64(bufp, fcall->params.twrite.offset);
-		buf_put_int32(bufp, fcall->params.twrite.count);
-		buf_put_data(bufp, fcall->params.twrite.data,
-			     fcall->params.twrite.count);
-		break;
-	case TCLUNK:
-		buf_put_int32(bufp, fcall->params.tclunk.fid);
-		break;
-	case TREMOVE:
-		buf_put_int32(bufp, fcall->params.tremove.fid);
-		break;
-	case TSTAT:
-		buf_put_int32(bufp, fcall->params.tstat.fid);
-		break;
-	case TWSTAT:
-		buf_put_int32(bufp, fcall->params.twstat.fid);
-		stat = fcall->params.twstat.stat;
-
-		buf_put_int16(bufp, stat->size + 2);
-		serialize_stat(v9ses, stat, bufp);
-		break;
-	}
+	p = bufp->p;
+	buf_get_stat(bufp, stat, extended);
 
 	if (buf_check_overflow(bufp))
-		return -EIO;
-
-	return fcall->size;
+		return 0;
+	else
+		return bufp->p - p;
 }
 
 /**
  * deserialize_fcall - unmarshal a response
- * @v9ses: session information
- * @msgsize: size of rcall message
  * @buf: recieved buffer
  * @buflen: length of received buffer
  * @rcall: fcall structure to populate
  * @rcalllen: length of fcall structure to populate
+ * @extended: non-zero if 9P2000.u
  *
  */
 
 int
-v9fs_deserialize_fcall(struct v9fs_session_info *v9ses, u32 msgsize,
-		       void *buf, u32 buflen, struct v9fs_fcall *rcall,
-		       int rcalllen)
+v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
+		       int extended)
 {
 
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
-	struct cbuf dbuffer;
-	struct cbuf *dbufp = &dbuffer;
 	int i = 0;
 
 	buf_init(bufp, buf, buflen);
-	buf_init(dbufp, (char *)rcall + sizeof(struct v9fs_fcall),
-		 rcalllen - sizeof(struct v9fs_fcall));
 
-	rcall->size = msgsize;
+	rcall->size = buf_get_int32(bufp);
 	rcall->id = buf_get_int8(bufp);
 	rcall->tag = buf_get_int16(bufp);
 
 	dprintk(DEBUG_CONV, "size %d id %d tag %d\n", rcall->size, rcall->id,
 		rcall->tag);
+
 	switch (rcall->id) {
 	default:
 		eprintk(KERN_ERR, "unknown message type: %d\n", rcall->id);
 		return -EPROTO;
 	case RVERSION:
 		rcall->params.rversion.msize = buf_get_int32(bufp);
-		rcall->params.rversion.version = buf_get_stringb(bufp, dbufp);
+		buf_get_str(bufp, &rcall->params.rversion.version);
 		break;
 	case RFLUSH:
 		break;
@@ -651,34 +353,27 @@ v9fs_deserialize_fcall(struct v9fs_session_info *v9ses, u32 msgsize,
 		break;
 	case RWALK:
 		rcall->params.rwalk.nwqid = buf_get_int16(bufp);
-		rcall->params.rwalk.wqids = buf_alloc(dbufp,
-		      rcall->params.rwalk.nwqid * sizeof(struct v9fs_qid));
-		if (rcall->params.rwalk.wqids)
-			for (i = 0; i < rcall->params.rwalk.nwqid; i++) {
-				rcall->params.rwalk.wqids[i].type =
-				    buf_get_int8(bufp);
-				rcall->params.rwalk.wqids[i].version =
-				    buf_get_int16(bufp);
-				rcall->params.rwalk.wqids[i].path =
-				    buf_get_int64(bufp);
-			}
+		if (rcall->params.rwalk.nwqid > V9FS_MAXWELEM) {
+			eprintk(KERN_ERR, "Rwalk with more than %d qids: %d\n",
+				V9FS_MAXWELEM, rcall->params.rwalk.nwqid);
+			return -EPROTO;
+		}
+
+		for (i = 0; i < rcall->params.rwalk.nwqid; i++)
+			buf_get_qid(bufp, &rcall->params.rwalk.wqids[i]);
 		break;
 	case ROPEN:
-		rcall->params.ropen.qid.type = buf_get_int8(bufp);
-		rcall->params.ropen.qid.version = buf_get_int32(bufp);
-		rcall->params.ropen.qid.path = buf_get_int64(bufp);
+		buf_get_qid(bufp, &rcall->params.ropen.qid);
 		rcall->params.ropen.iounit = buf_get_int32(bufp);
 		break;
 	case RCREATE:
-		rcall->params.rcreate.qid.type = buf_get_int8(bufp);
-		rcall->params.rcreate.qid.version = buf_get_int32(bufp);
-		rcall->params.rcreate.qid.path = buf_get_int64(bufp);
+		buf_get_qid(bufp, &rcall->params.rcreate.qid);
 		rcall->params.rcreate.iounit = buf_get_int32(bufp);
 		break;
 	case RREAD:
 		rcall->params.rread.count = buf_get_int32(bufp);
-		rcall->params.rread.data = buf_get_datab(bufp, dbufp,
-			rcall->params.rread.count);
+		rcall->params.rread.data = bufp->p;
+		buf_check_size(bufp, rcall->params.rread.count);
 		break;
 	case RWRITE:
 		rcall->params.rwrite.count = buf_get_int32(bufp);
@@ -689,20 +384,443 @@ v9fs_deserialize_fcall(struct v9fs_session_info *v9ses, u32 msgsize,
 		break;
 	case RSTAT:
 		buf_get_int16(bufp);
-		rcall->params.rstat.stat =
-		    deserialize_statb(v9ses, bufp, dbufp);
+		buf_get_stat(bufp, &rcall->params.rstat.stat, extended);
 		break;
 	case RWSTAT:
 		break;
 	case RERROR:
-		rcall->params.rerror.error = buf_get_stringb(bufp, dbufp);
-		if (v9ses->extended)
+		buf_get_str(bufp, &rcall->params.rerror.error);
+		if (extended)
 			rcall->params.rerror.errno = buf_get_int16(bufp);
 		break;
 	}
 
-	if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
+	if (buf_check_overflow(bufp)) {
+		dprintk(DEBUG_ERROR, "buffer overflow\n");
 		return -EIO;
+	}
+
+	return bufp->p - bufp->sp;
+}
+
+static inline void v9fs_put_int8(struct cbuf *bufp, u8 val, u8 * p)
+{
+	*p = val;
+	buf_put_int8(bufp, val);
+}
+
+static inline void v9fs_put_int16(struct cbuf *bufp, u16 val, u16 * p)
+{
+	*p = val;
+	buf_put_int16(bufp, val);
+}
+
+static inline void v9fs_put_int32(struct cbuf *bufp, u32 val, u32 * p)
+{
+	*p = val;
+	buf_put_int32(bufp, val);
+}
+
+static inline void v9fs_put_int64(struct cbuf *bufp, u64 val, u64 * p)
+{
+	*p = val;
+	buf_put_int64(bufp, val);
+}
 
-	return rcall->size;
+static inline void
+v9fs_put_str(struct cbuf *bufp, char *data, struct v9fs_str *str)
+{
+	if (data) {
+		str->len = strlen(data);
+		str->str = bufp->p;
+	} else {
+		str->len = 0;
+		str->str = NULL;
+	}
+
+	buf_put_stringn(bufp, data, str->len);
+}
+
+static inline int
+v9fs_put_user_data(struct cbuf *bufp, const char __user * data, int count,
+		   unsigned char **pdata)
+{
+	*pdata = buf_alloc(bufp, count);
+	return copy_from_user(*pdata, data, count);
+}
+
+static void
+v9fs_put_wstat(struct cbuf *bufp, struct v9fs_wstat *wstat,
+	       struct v9fs_stat *stat, int statsz, int extended)
+{
+	v9fs_put_int16(bufp, statsz, &stat->size);
+	v9fs_put_int16(bufp, wstat->type, &stat->type);
+	v9fs_put_int32(bufp, wstat->dev, &stat->dev);
+	v9fs_put_int8(bufp, wstat->qid.type, &stat->qid.type);
+	v9fs_put_int32(bufp, wstat->qid.version, &stat->qid.version);
+	v9fs_put_int64(bufp, wstat->qid.path, &stat->qid.path);
+	v9fs_put_int32(bufp, wstat->mode, &stat->mode);
+	v9fs_put_int32(bufp, wstat->atime, &stat->atime);
+	v9fs_put_int32(bufp, wstat->mtime, &stat->mtime);
+	v9fs_put_int64(bufp, wstat->length, &stat->length);
+
+	v9fs_put_str(bufp, wstat->name, &stat->name);
+	v9fs_put_str(bufp, wstat->uid, &stat->uid);
+	v9fs_put_str(bufp, wstat->gid, &stat->gid);
+	v9fs_put_str(bufp, wstat->muid, &stat->muid);
+
+	if (extended) {
+		v9fs_put_str(bufp, wstat->extension, &stat->extension);
+		v9fs_put_int32(bufp, wstat->n_uid, &stat->n_uid);
+		v9fs_put_int32(bufp, wstat->n_gid, &stat->n_gid);
+		v9fs_put_int32(bufp, wstat->n_muid, &stat->n_muid);
+	}
+}
+
+static struct v9fs_fcall *
+v9fs_create_common(struct cbuf *bufp, u32 size, u8 id)
+{
+	struct v9fs_fcall *fc;
+
+	size += 4 + 1 + 2;	/* size[4] id[1] tag[2] */
+	fc = kmalloc(sizeof(struct v9fs_fcall) + size, GFP_KERNEL);
+	if (!fc)
+		return ERR_PTR(-ENOMEM);
+
+	fc->sdata = (char *)fc + sizeof(*fc);
+
+	buf_init(bufp, (char *)fc->sdata, size);
+	v9fs_put_int32(bufp, size, &fc->size);
+	v9fs_put_int8(bufp, id, &fc->id);
+	v9fs_put_int16(bufp, V9FS_NOTAG, &fc->tag);
+
+	return fc;
+}
+
+void v9fs_set_tag(struct v9fs_fcall *fc, u16 tag)
+{
+	fc->tag = tag;
+	*(__le16 *) (fc->sdata + 5) = cpu_to_le16(tag);
+}
+
+struct v9fs_fcall *v9fs_create_tversion(u32 msize, char *version)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4 + 2 + strlen(version);	/* msize[4] version[s] */
+	fc = v9fs_create_common(bufp, size, TVERSION);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, msize, &fc->params.tversion.msize);
+	v9fs_put_str(bufp, version, &fc->params.tversion.version);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tauth(u32 afid, char *uname, char *aname)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4 + 2 + strlen(uname) + 2 + strlen(aname);	/* afid[4] uname[s] aname[s] */
+	fc = v9fs_create_common(bufp, size, TAUTH);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, afid, &fc->params.tauth.afid);
+	v9fs_put_str(bufp, uname, &fc->params.tauth.uname);
+	v9fs_put_str(bufp, aname, &fc->params.tauth.aname);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *
+v9fs_create_tattach(u32 fid, u32 afid, char *uname, char *aname)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4 + 4 + 2 + strlen(uname) + 2 + strlen(aname);	/* fid[4] afid[4] uname[s] aname[s] */
+	fc = v9fs_create_common(bufp, size, TATTACH);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tattach.fid);
+	v9fs_put_int32(bufp, afid, &fc->params.tattach.afid);
+	v9fs_put_str(bufp, uname, &fc->params.tattach.uname);
+	v9fs_put_str(bufp, aname, &fc->params.tattach.aname);
+
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tflush(u16 oldtag)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 2;		/* oldtag[2] */
+	fc = v9fs_create_common(bufp, size, TFLUSH);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int16(bufp, oldtag, &fc->params.tflush.oldtag);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
+				     char **wnames)
+{
+	int i, size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	if (nwname > V9FS_MAXWELEM) {
+		dprintk(DEBUG_ERROR, "nwname > %d\n", V9FS_MAXWELEM);
+		return NULL;
+	}
+
+	size = 4 + 4 + 2;	/* fid[4] newfid[4] nwname[2] ... */
+	for (i = 0; i < nwname; i++) {
+		size += 2 + strlen(wnames[i]);	/* wname[s] */
+	}
+
+	fc = v9fs_create_common(bufp, size, TWALK);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.twalk.fid);
+	v9fs_put_int32(bufp, newfid, &fc->params.twalk.newfid);
+	v9fs_put_int16(bufp, nwname, &fc->params.twalk.nwname);
+	for (i = 0; i < nwname; i++) {
+		v9fs_put_str(bufp, wnames[i], &fc->params.twalk.wnames[i]);
+	}
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4 + 1;		/* fid[4] mode[1] */
+	fc = v9fs_create_common(bufp, size, TOPEN);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.topen.fid);
+	v9fs_put_int8(bufp, mode, &fc->params.topen.mode);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4 + 2 + strlen(name) + 4 + 1;	/* fid[4] name[s] perm[4] mode[1] */
+	fc = v9fs_create_common(bufp, size, TCREATE);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tcreate.fid);
+	v9fs_put_str(bufp, name, &fc->params.tcreate.name);
+	v9fs_put_int32(bufp, perm, &fc->params.tcreate.perm);
+	v9fs_put_int8(bufp, mode, &fc->params.tcreate.mode);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tread(u32 fid, u64 offset, u32 count)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4 + 8 + 4;	/* fid[4] offset[8] count[4] */
+	fc = v9fs_create_common(bufp, size, TREAD);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tread.fid);
+	v9fs_put_int64(bufp, offset, &fc->params.tread.offset);
+	v9fs_put_int32(bufp, count, &fc->params.tread.count);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
+				      const char __user * data)
+{
+	int size, err;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4 + 8 + 4 + count;	/* fid[4] offset[8] count[4] data[count] */
+	fc = v9fs_create_common(bufp, size, TWRITE);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.twrite.fid);
+	v9fs_put_int64(bufp, offset, &fc->params.twrite.offset);
+	v9fs_put_int32(bufp, count, &fc->params.twrite.count);
+	err = v9fs_put_user_data(bufp, data, count, &fc->params.twrite.data);
+	if (err) {
+		kfree(fc);
+		fc = ERR_PTR(err);
+	}
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tclunk(u32 fid)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4;		/* fid[4] */
+	fc = v9fs_create_common(bufp, size, TCLUNK);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tclunk.fid);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tremove(u32 fid)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4;		/* fid[4] */
+	fc = v9fs_create_common(bufp, size, TREMOVE);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tremove.fid);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tstat(u32 fid)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4;		/* fid[4] */
+	fc = v9fs_create_common(bufp, size, TSTAT);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tstat.fid);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_twstat(u32 fid, struct v9fs_wstat *wstat,
+				      int extended)
+{
+	int size, statsz;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	statsz = v9fs_size_wstat(wstat, extended);
+	size = 4 + 2 + 2 + statsz;	/* fid[4] stat[n] */
+	fc = v9fs_create_common(bufp, size, TWSTAT);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.twstat.fid);
+	buf_put_int16(bufp, statsz + 2);
+	v9fs_put_wstat(bufp, wstat, &fc->params.twstat.stat, statsz, extended);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
 }
diff --git a/fs/9p/conv.h b/fs/9p/conv.h
index ee849613c61a52..26a736e4a2e746 100644
--- a/fs/9p/conv.h
+++ b/fs/9p/conv.h
@@ -1,8 +1,9 @@
 /*
  * linux/fs/9p/conv.h
  *
- * 9P protocol conversion definitions
+ * 9P protocol conversion definitions.
  *
+ *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  *
@@ -24,13 +25,27 @@
  *
  */
 
-int v9fs_deserialize_stat(struct v9fs_session_info *, void *buf,
-			  u32 buflen, struct v9fs_stat *stat, u32 statlen);
-int v9fs_serialize_fcall(struct v9fs_session_info *, struct v9fs_fcall *tcall,
-			 void *buf, u32 buflen);
-int v9fs_deserialize_fcall(struct v9fs_session_info *, u32 msglen,
-			   void *buf, u32 buflen, struct v9fs_fcall *rcall,
-			   int rcalllen);
+int v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
+	int extended);
+int v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
+	int extended);
 
-/* this one is actually in error.c right now */
-int v9fs_errstr2errno(char *errstr);
+void v9fs_set_tag(struct v9fs_fcall *fc, u16 tag);
+
+struct v9fs_fcall *v9fs_create_tversion(u32 msize, char *version);
+struct v9fs_fcall *v9fs_create_tauth(u32 afid, char *uname, char *aname);
+struct v9fs_fcall *v9fs_create_tattach(u32 fid, u32 afid, char *uname,
+	char *aname);
+struct v9fs_fcall *v9fs_create_tflush(u16 oldtag);
+struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
+	char **wnames);
+struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode);
+struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode);
+struct v9fs_fcall *v9fs_create_tread(u32 fid, u64 offset, u32 count);
+struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
+	const char __user *data);
+struct v9fs_fcall *v9fs_create_tclunk(u32 fid);
+struct v9fs_fcall *v9fs_create_tremove(u32 fid);
+struct v9fs_fcall *v9fs_create_tstat(u32 fid);
+struct v9fs_fcall *v9fs_create_twstat(u32 fid, struct v9fs_wstat *wstat,
+	int extended);
diff --git a/fs/9p/debug.h b/fs/9p/debug.h
index 4445f06919d9bd..fe551032788b68 100644
--- a/fs/9p/debug.h
+++ b/fs/9p/debug.h
@@ -51,16 +51,23 @@ do { \
 #if DEBUG_DUMP_PKT
 static inline void dump_data(const unsigned char *data, unsigned int datalen)
 {
-	int i, j;
-	int len = datalen;
+	int i, n;
+	char buf[5*8];
 
-	printk(KERN_DEBUG "data ");
-	for (i = 0; i < len; i += 4) {
-		for (j = 0; (j < 4) && (i + j < len); j++)
-			printk(KERN_DEBUG "%02x", data[i + j]);
-		printk(KERN_DEBUG " ");
+	n = 0;
+	i = 0;
+	while (i < datalen) {
+		n += snprintf(buf+n, sizeof(buf)-n, "%02x", data[i++]);
+		if (i%4 == 0)
+			n += snprintf(buf+n, sizeof(buf)-n, " ");
+
+		if (i%16 == 0) {
+			dprintk(DEBUG_ERROR, "%s\n", buf);
+			n = 0;
+		}
 	}
-	printk(KERN_DEBUG "\n");
+
+	dprintk(DEBUG_ERROR, "%s\n", buf);
 }
 #else				/* DEBUG_DUMP_PKT */
 static inline void dump_data(const unsigned char *data, unsigned int datalen)
diff --git a/fs/9p/error.c b/fs/9p/error.c
index 834cb179e3888c..e4b6f8f38b6fbc 100644
--- a/fs/9p/error.c
+++ b/fs/9p/error.c
@@ -33,7 +33,6 @@
 
 #include <linux/list.h>
 #include <linux/jhash.h>
-#include <linux/string.h>
 
 #include "debug.h"
 #include "error.h"
@@ -55,7 +54,8 @@ int v9fs_error_init(void)
 
 	/* load initial error map into hash table */
 	for (c = errmap; c->name != NULL; c++) {
-		bucket = jhash(c->name, strlen(c->name), 0) % ERRHASHSZ;
+		c->namelen = strlen(c->name);
+		bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
 		INIT_HLIST_NODE(&c->list);
 		hlist_add_head(&c->list, &hash_errmap[bucket]);
 	}
@@ -69,15 +69,15 @@ int v9fs_error_init(void)
  *
  */
 
-int v9fs_errstr2errno(char *errstr)
+int v9fs_errstr2errno(char *errstr, int len)
 {
 	int errno = 0;
 	struct hlist_node *p = NULL;
 	struct errormap *c = NULL;
-	int bucket = jhash(errstr, strlen(errstr), 0) % ERRHASHSZ;
+	int bucket = jhash(errstr, len, 0) % ERRHASHSZ;
 
 	hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
-		if (!strcmp(c->name, errstr)) {
+		if (c->namelen==len && !memcmp(c->name, errstr, len)) {
 			errno = c->val;
 			break;
 		}
diff --git a/fs/9p/error.h b/fs/9p/error.h
index 78f89acf7c9aff..a9794e85fe5101 100644
--- a/fs/9p/error.h
+++ b/fs/9p/error.h
@@ -36,6 +36,7 @@ struct errormap {
 	char *name;
 	int val;
 
+	int namelen;
 	struct hlist_node list;
 };
 
@@ -175,4 +176,3 @@ static struct errormap errmap[] = {
 };
 
 extern int v9fs_error_init(void);
-extern int v9fs_errstr2errno(char *errstr);
diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index d95f8626d1702e..eda449778fa55d 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -31,9 +31,6 @@
 #include "v9fs.h"
 #include "9p.h"
 #include "v9fs_vfs.h"
-#include "transport.h"
-#include "mux.h"
-#include "conv.h"
 #include "fid.h"
 
 /**
@@ -164,7 +161,7 @@ static struct v9fs_fid *v9fs_fid_walk_up(struct dentry *dentry)
 	return v9fs_fid_create(dentry, v9ses, fidnum, 0);
 
 clunk_fid:
-	v9fs_t_clunk(v9ses, fidnum, NULL);
+	v9fs_t_clunk(v9ses, fidnum);
 	return ERR_PTR(err);
 }
 
diff --git a/fs/9p/mux.c b/fs/9p/mux.c
index 8835b576f7445c..945cb368d45194 100644
--- a/fs/9p/mux.c
+++ b/fs/9p/mux.c
@@ -4,7 +4,7 @@
  * Protocol Multiplexer
  *
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
- *  Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -28,448 +28,943 @@
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
+#include <linux/poll.h>
 #include <linux/kthread.h>
 #include <linux/idr.h>
 
 #include "debug.h"
 #include "v9fs.h"
 #include "9p.h"
-#include "transport.h"
 #include "conv.h"
+#include "transport.h"
 #include "mux.h"
 
+#define ERREQFLUSH	1
+#define SCHED_TIMEOUT	10
+#define MAXPOLLWADDR	2
+
+enum {
+	Rworksched = 1,		/* read work scheduled or running */
+	Rpending = 2,		/* can read */
+	Wworksched = 4,		/* write work scheduled or running */
+	Wpending = 8,		/* can write */
+};
+
+struct v9fs_mux_poll_task;
+
+struct v9fs_req {
+	int tag;
+	struct v9fs_fcall *tcall;
+	struct v9fs_fcall *rcall;
+	int err;
+	v9fs_mux_req_callback cb;
+	void *cba;
+	struct list_head req_list;
+};
+
+struct v9fs_mux_data {
+	spinlock_t lock;
+	struct list_head mux_list;
+	struct v9fs_mux_poll_task *poll_task;
+	int msize;
+	unsigned char *extended;
+	struct v9fs_transport *trans;
+	struct v9fs_idpool tidpool;
+	int err;
+	wait_queue_head_t equeue;
+	struct list_head req_list;
+	struct list_head unsent_req_list;
+	struct v9fs_fcall *rcall;
+	int rpos;
+	char *rbuf;
+	int wpos;
+	int wsize;
+	char *wbuf;
+	wait_queue_t poll_wait[MAXPOLLWADDR];
+	wait_queue_head_t *poll_waddr[MAXPOLLWADDR];
+	poll_table pt;
+	struct work_struct rq;
+	struct work_struct wq;
+	unsigned long wsched;
+};
+
+struct v9fs_mux_poll_task {
+	struct task_struct *task;
+	struct list_head mux_list;
+	int muxnum;
+};
+
+struct v9fs_mux_rpc {
+	struct v9fs_mux_data *m;
+	struct v9fs_req *req;
+	int err;
+	struct v9fs_fcall *rcall;
+	wait_queue_head_t wqueue;
+};
+
+static int v9fs_poll_proc(void *);
+static void v9fs_read_work(void *);
+static void v9fs_write_work(void *);
+static void v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address,
+			  poll_table * p);
+static u16 v9fs_mux_get_tag(struct v9fs_mux_data *);
+static void v9fs_mux_put_tag(struct v9fs_mux_data *, u16);
+
+static DECLARE_MUTEX(v9fs_mux_task_lock);
+static struct workqueue_struct *v9fs_mux_wq;
+
+static int v9fs_mux_num;
+static int v9fs_mux_poll_task_num;
+static struct v9fs_mux_poll_task v9fs_mux_poll_tasks[100];
+
+int v9fs_mux_global_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++)
+		v9fs_mux_poll_tasks[i].task = NULL;
+
+	v9fs_mux_wq = create_workqueue("v9fs");
+	if (!v9fs_mux_wq)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void v9fs_mux_global_exit(void)
+{
+	destroy_workqueue(v9fs_mux_wq);
+}
+
 /**
- * dprintcond - print condition of session info
- * @v9ses: session info structure
- * @req: RPC request structure
+ * v9fs_mux_calc_poll_procs - calculates the number of polling procs
+ * based on the number of mounted v9fs filesystems.
  *
+ * The current implementation returns sqrt of the number of mounts.
  */
+inline int v9fs_mux_calc_poll_procs(int muxnum)
+{
+	int n;
+
+	if (v9fs_mux_poll_task_num)
+		n = muxnum / v9fs_mux_poll_task_num +
+		    (muxnum % v9fs_mux_poll_task_num ? 1 : 0);
+	else
+		n = 1;
+
+	if (n > ARRAY_SIZE(v9fs_mux_poll_tasks))
+		n = ARRAY_SIZE(v9fs_mux_poll_tasks);
+
+	return n;
+}
 
-static inline int
-dprintcond(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
+static int v9fs_mux_poll_start(struct v9fs_mux_data *m)
 {
-	dprintk(DEBUG_MUX, "condition: %d, %p\n", v9ses->transport->status,
-		req->rcall);
+	int i, n;
+	struct v9fs_mux_poll_task *vpt, *vptlast;
+	struct task_struct *pproc;
+
+	dprintk(DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, v9fs_mux_num,
+		v9fs_mux_poll_task_num);
+	up(&v9fs_mux_task_lock);
+
+	n = v9fs_mux_calc_poll_procs(v9fs_mux_num + 1);
+	if (n > v9fs_mux_poll_task_num) {
+		for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++) {
+			if (v9fs_mux_poll_tasks[i].task == NULL) {
+				vpt = &v9fs_mux_poll_tasks[i];
+				dprintk(DEBUG_MUX, "create proc %p\n", vpt);
+				pproc = kthread_create(v9fs_poll_proc, vpt,
+						   "v9fs-poll");
+
+				if (!IS_ERR(pproc)) {
+					vpt->task = pproc;
+					INIT_LIST_HEAD(&vpt->mux_list);
+					vpt->muxnum = 0;
+					v9fs_mux_poll_task_num++;
+					wake_up_process(vpt->task);
+				}
+				break;
+			}
+		}
+
+		if (i >= ARRAY_SIZE(v9fs_mux_poll_tasks))
+			dprintk(DEBUG_ERROR, "warning: no free poll slots\n");
+	}
+
+	n = (v9fs_mux_num + 1) / v9fs_mux_poll_task_num +
+	    ((v9fs_mux_num + 1) % v9fs_mux_poll_task_num ? 1 : 0);
+
+	vptlast = NULL;
+	for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++) {
+		vpt = &v9fs_mux_poll_tasks[i];
+		if (vpt->task != NULL) {
+			vptlast = vpt;
+			if (vpt->muxnum < n) {
+				dprintk(DEBUG_MUX, "put in proc %d\n", i);
+				list_add(&m->mux_list, &vpt->mux_list);
+				vpt->muxnum++;
+				m->poll_task = vpt;
+				memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
+				init_poll_funcptr(&m->pt, v9fs_pollwait);
+				break;
+			}
+		}
+	}
+
+	if (i >= ARRAY_SIZE(v9fs_mux_poll_tasks)) {
+		if (vptlast == NULL)
+			return -ENOMEM;
+
+		dprintk(DEBUG_MUX, "put in proc %d\n", i);
+		list_add(&m->mux_list, &vptlast->mux_list);
+		vptlast->muxnum++;
+		m->poll_task = vptlast;
+		memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
+		init_poll_funcptr(&m->pt, v9fs_pollwait);
+	}
+
+	v9fs_mux_num++;
+	down(&v9fs_mux_task_lock);
+
 	return 0;
 }
 
+static void v9fs_mux_poll_stop(struct v9fs_mux_data *m)
+{
+	int i;
+	struct v9fs_mux_poll_task *vpt;
+
+	up(&v9fs_mux_task_lock);
+	vpt = m->poll_task;
+	list_del(&m->mux_list);
+	for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
+		if (m->poll_waddr[i] != NULL) {
+			remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]);
+			m->poll_waddr[i] = NULL;
+		}
+	}
+	vpt->muxnum--;
+	if (!vpt->muxnum) {
+		dprintk(DEBUG_MUX, "destroy proc %p\n", vpt);
+		send_sig(SIGKILL, vpt->task, 1);
+		vpt->task = NULL;
+		v9fs_mux_poll_task_num--;
+	}
+	v9fs_mux_num--;
+	down(&v9fs_mux_task_lock);
+}
+
 /**
- * xread - force read of a certain number of bytes
- * @v9ses: session info structure
- * @ptr: pointer to buffer
- * @sz: number of bytes to read
+ * v9fs_mux_init - allocate and initialize the per-session mux data
+ * Creates the polling task if this is the first session.
  *
- * Chuck Cranor CS-533 project1
+ * @trans - transport structure
+ * @msize - maximum message size
+ * @extended - pointer to the extended flag
  */
-
-static int xread(struct v9fs_session_info *v9ses, void *ptr, unsigned long sz)
+struct v9fs_mux_data *v9fs_mux_init(struct v9fs_transport *trans, int msize,
+				    unsigned char *extended)
 {
-	int rd = 0;
-	int ret = 0;
-	while (rd < sz) {
-		ret = v9ses->transport->read(v9ses->transport, ptr, sz - rd);
-		if (ret <= 0) {
-			dprintk(DEBUG_ERROR, "xread errno %d\n", ret);
-			return ret;
+	int i, n;
+	struct v9fs_mux_data *m, *mtmp;
+
+	dprintk(DEBUG_MUX, "transport %p msize %d\n", trans, msize);
+	m = kmalloc(sizeof(struct v9fs_mux_data), GFP_KERNEL);
+	if (!m)
+		return ERR_PTR(-ENOMEM);
+
+	spin_lock_init(&m->lock);
+	INIT_LIST_HEAD(&m->mux_list);
+	m->msize = msize;
+	m->extended = extended;
+	m->trans = trans;
+	idr_init(&m->tidpool.pool);
+	init_MUTEX(&m->tidpool.lock);
+	m->err = 0;
+	init_waitqueue_head(&m->equeue);
+	INIT_LIST_HEAD(&m->req_list);
+	INIT_LIST_HEAD(&m->unsent_req_list);
+	m->rcall = NULL;
+	m->rpos = 0;
+	m->rbuf = NULL;
+	m->wpos = m->wsize = 0;
+	m->wbuf = NULL;
+	INIT_WORK(&m->rq, v9fs_read_work, m);
+	INIT_WORK(&m->wq, v9fs_write_work, m);
+	m->wsched = 0;
+	memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
+	m->poll_task = NULL;
+	n = v9fs_mux_poll_start(m);
+	if (n)
+		return ERR_PTR(n);
+
+	n = trans->poll(trans, &m->pt);
+	if (n & POLLIN) {
+		dprintk(DEBUG_MUX, "mux %p can read\n", m);
+		set_bit(Rpending, &m->wsched);
+	}
+
+	if (n & POLLOUT) {
+		dprintk(DEBUG_MUX, "mux %p can write\n", m);
+		set_bit(Wpending, &m->wsched);
+	}
+
+	for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
+		if (IS_ERR(m->poll_waddr[i])) {
+			v9fs_mux_poll_stop(m);
+			mtmp = (void *)m->poll_waddr;	/* the error code */
+			kfree(m);
+			m = mtmp;
+			break;
 		}
-		rd += ret;
-		ptr += ret;
 	}
-	return (rd);
+
+	return m;
 }
 
 /**
- * read_message - read a full 9P2000 fcall packet
- * @v9ses: session info structure
- * @rcall: fcall structure to read into
- * @rcalllen: size of fcall buffer
- *
+ * v9fs_mux_destroy - cancels all pending requests and frees mux resources
  */
+void v9fs_mux_destroy(struct v9fs_mux_data *m)
+{
+	dprintk(DEBUG_MUX, "mux %p prev %p next %p\n", m,
+		m->mux_list.prev, m->mux_list.next);
+	v9fs_mux_cancel(m, -ECONNRESET);
+
+	if (!list_empty(&m->req_list)) {
+		/* wait until all processes waiting on this session exit */
+		dprintk(DEBUG_MUX, "mux %p waiting for empty request queue\n",
+			m);
+		wait_event_timeout(m->equeue, (list_empty(&m->req_list)), 5000);
+		dprintk(DEBUG_MUX, "mux %p request queue empty: %d\n", m,
+			list_empty(&m->req_list));
+	}
+
+	v9fs_mux_poll_stop(m);
+	m->trans = NULL;
+
+	kfree(m);
+}
 
-static int
-read_message(struct v9fs_session_info *v9ses,
-	     struct v9fs_fcall *rcall, int rcalllen)
+/**
+ * v9fs_pollwait - called by files poll operation to add v9fs-poll task
+ * 	to files wait queue
+ */
+static void
+v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address,
+	      poll_table * p)
 {
-	unsigned char buf[4];
-	void *data;
-	int size = 0;
-	int res = 0;
-
-	res = xread(v9ses, buf, sizeof(buf));
-	if (res < 0) {
-		dprintk(DEBUG_ERROR,
-			"Reading of count field failed returned: %d\n", res);
-		return res;
+	int i;
+	struct v9fs_mux_data *m;
+
+	m = container_of(p, struct v9fs_mux_data, pt);
+	for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++)
+		if (m->poll_waddr[i] == NULL)
+			break;
+
+	if (i >= ARRAY_SIZE(m->poll_waddr)) {
+		dprintk(DEBUG_ERROR, "not enough wait_address slots\n");
+		return;
 	}
 
-	if (res < 4) {
-		dprintk(DEBUG_ERROR,
-			"Reading of count field failed returned: %d\n", res);
-		return -EIO;
+	m->poll_waddr[i] = wait_address;
+
+	if (!wait_address) {
+		dprintk(DEBUG_ERROR, "no wait_address\n");
+		m->poll_waddr[i] = ERR_PTR(-EIO);
+		return;
 	}
 
-	size = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
-	dprintk(DEBUG_MUX, "got a packet count: %d\n", size);
+	init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task);
+	add_wait_queue(wait_address, &m->poll_wait[i]);
+}
+
+/**
+ * v9fs_poll_mux - polls a mux and schedules read or write works if necessary
+ */
+static inline void v9fs_poll_mux(struct v9fs_mux_data *m)
+{
+	int n;
 
-	/* adjust for the four bytes of size */
-	size -= 4;
+	if (m->err < 0)
+		return;
 
-	if (size > v9ses->maxdata) {
-		dprintk(DEBUG_ERROR, "packet too big: %d\n", size);
-		return -E2BIG;
+	n = m->trans->poll(m->trans, NULL);
+	if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
+		dprintk(DEBUG_MUX, "error mux %p err %d\n", m, n);
+		if (n >= 0)
+			n = -ECONNRESET;
+		v9fs_mux_cancel(m, n);
 	}
 
-	data = kmalloc(size, GFP_KERNEL);
-	if (!data) {
-		eprintk(KERN_WARNING, "out of memory\n");
-		return -ENOMEM;
+	if (n & POLLIN) {
+		set_bit(Rpending, &m->wsched);
+		dprintk(DEBUG_MUX, "mux %p can read\n", m);
+		if (!test_and_set_bit(Rworksched, &m->wsched)) {
+			dprintk(DEBUG_MUX, "schedule read work mux %p\n", m);
+			queue_work(v9fs_mux_wq, &m->rq);
+		}
 	}
 
-	res = xread(v9ses, data, size);
-	if (res < size) {
-		dprintk(DEBUG_ERROR, "Reading of fcall failed returned: %d\n",
-			res);
-		kfree(data);
-		return res;
+	if (n & POLLOUT) {
+		set_bit(Wpending, &m->wsched);
+		dprintk(DEBUG_MUX, "mux %p can write\n", m);
+		if ((m->wsize || !list_empty(&m->unsent_req_list))
+		    && !test_and_set_bit(Wworksched, &m->wsched)) {
+			dprintk(DEBUG_MUX, "schedule write work mux %p\n", m);
+			queue_work(v9fs_mux_wq, &m->wq);
+		}
 	}
+}
+
+/**
+ * v9fs_poll_proc - polls all v9fs transports for new events and queues
+ * 	the appropriate work to the work queue
+ */
+static int v9fs_poll_proc(void *a)
+{
+	struct v9fs_mux_data *m, *mtmp;
+	struct v9fs_mux_poll_task *vpt;
 
-	/* we now have an in-memory string that is the reply.
-	 * deserialize it. There is very little to go wrong at this point
-	 * save for v9fs_alloc errors.
-	 */
-	res = v9fs_deserialize_fcall(v9ses, size, data, v9ses->maxdata,
-				     rcall, rcalllen);
+	vpt = a;
+	dprintk(DEBUG_MUX, "start %p %p\n", current, vpt);
+	allow_signal(SIGKILL);
+	while (!kthread_should_stop()) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (signal_pending(current))
+			break;
 
-	kfree(data);
+		list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) {
+			v9fs_poll_mux(m);
+		}
 
-	if (res < 0)
-		return res;
+		dprintk(DEBUG_MUX, "sleeping...\n");
+		schedule_timeout(SCHED_TIMEOUT * HZ);
+	}
 
+	__set_current_state(TASK_RUNNING);
+	dprintk(DEBUG_MUX, "finish\n");
 	return 0;
 }
 
 /**
- * v9fs_recv - receive an RPC response for a particular tag
- * @v9ses: session info structure
- * @req: RPC request structure
- *
+ * v9fs_write_work - called when a transport can send some data
  */
-
-static int v9fs_recv(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
+static void v9fs_write_work(void *a)
 {
-	int ret = 0;
+	int n, err;
+	struct v9fs_mux_data *m;
+	struct v9fs_req *req;
 
-	dprintk(DEBUG_MUX, "waiting for response: %d\n", req->tcall->tag);
-	ret = wait_event_interruptible(v9ses->read_wait,
-		       ((v9ses->transport->status != Connected) ||
-			(req->rcall != 0) || (req->err < 0) ||
-			dprintcond(v9ses, req)));
+	m = a;
 
-	dprintk(DEBUG_MUX, "got it: rcall %p\n", req->rcall);
+	if (m->err < 0) {
+		clear_bit(Wworksched, &m->wsched);
+		return;
+	}
 
-	spin_lock(&v9ses->muxlock);
-	list_del(&req->next);
-	spin_unlock(&v9ses->muxlock);
+	if (!m->wsize) {
+		if (list_empty(&m->unsent_req_list)) {
+			clear_bit(Wworksched, &m->wsched);
+			return;
+		}
 
-	if (req->err < 0)
-		return req->err;
+		spin_lock(&m->lock);
+		req =
+		    list_entry(m->unsent_req_list.next, struct v9fs_req,
+			       req_list);
+		list_move_tail(&req->req_list, &m->req_list);
+		m->wbuf = req->tcall->sdata;
+		m->wsize = req->tcall->size;
+		m->wpos = 0;
+		dump_data(m->wbuf, m->wsize);
+		spin_unlock(&m->lock);
+	}
 
-	if (v9ses->transport->status == Disconnected)
-		return -ECONNRESET;
+	dprintk(DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, m->wsize);
+	clear_bit(Wpending, &m->wsched);
+	err = m->trans->write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos);
+	dprintk(DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
+	if (err == -EAGAIN) {
+		clear_bit(Wworksched, &m->wsched);
+		return;
+	}
 
-	return ret;
-}
+	if (err <= 0)
+		goto error;
 
-/**
- * v9fs_send - send a 9P request
- * @v9ses: session info structure
- * @req: RPC request to send
- *
- */
+	m->wpos += err;
+	if (m->wpos == m->wsize)
+		m->wpos = m->wsize = 0;
+
+	if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
+		if (test_and_clear_bit(Wpending, &m->wsched))
+			n = POLLOUT;
+		else
+			n = m->trans->poll(m->trans, NULL);
+
+		if (n & POLLOUT) {
+			dprintk(DEBUG_MUX, "schedule write work mux %p\n", m);
+			queue_work(v9fs_mux_wq, &m->wq);
+		} else
+			clear_bit(Wworksched, &m->wsched);
+	} else
+		clear_bit(Wworksched, &m->wsched);
+
+	return;
 
-static int v9fs_send(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
+      error:
+	v9fs_mux_cancel(m, err);
+	clear_bit(Wworksched, &m->wsched);
+}
+
+static void process_request(struct v9fs_mux_data *m, struct v9fs_req *req)
 {
-	int ret = -1;
-	void *data = NULL;
-	struct v9fs_fcall *tcall = req->tcall;
+	int ecode, tag;
+	struct v9fs_str *ename;
 
-	data = kmalloc(v9ses->maxdata + V9FS_IOHDRSZ, GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
+	tag = req->tag;
+	if (req->rcall->id == RERROR && !req->err) {
+		ecode = req->rcall->params.rerror.errno;
+		ename = &req->rcall->params.rerror.error;
 
-	tcall->size = 0;	/* enforce size recalculation */
-	ret =
-	    v9fs_serialize_fcall(v9ses, tcall, data,
-				 v9ses->maxdata + V9FS_IOHDRSZ);
-	if (ret < 0)
-		goto free_data;
+		dprintk(DEBUG_MUX, "Rerror %.*s\n", ename->len, ename->str);
 
-	spin_lock(&v9ses->muxlock);
-	list_add(&req->next, &v9ses->mux_fcalls);
-	spin_unlock(&v9ses->muxlock);
+		if (*m->extended)
+			req->err = -ecode;
 
-	dprintk(DEBUG_MUX, "sending message: tag %d size %d\n", tcall->tag,
-		tcall->size);
-	ret = v9ses->transport->write(v9ses->transport, data, tcall->size);
+		if (!req->err) {
+			req->err = v9fs_errstr2errno(ename->str, ename->len);
 
-	if (ret != tcall->size) {
-		spin_lock(&v9ses->muxlock);
-		list_del(&req->next);
-		kfree(req->rcall);
+			if (!req->err) {	/* string match failed */
+				PRINT_FCALL_ERROR("unknown error", req->rcall);
+			}
+
+			if (!req->err)
+				req->err = -ESERVERFAULT;
+		}
+	} else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
+		dprintk(DEBUG_ERROR, "fcall mismatch: expected %d, got %d\n",
+			req->tcall->id + 1, req->rcall->id);
+		if (!req->err)
+			req->err = -EIO;
+	}
 
-		spin_unlock(&v9ses->muxlock);
-		if (ret >= 0)
-			ret = -EREMOTEIO;
+	if (req->cb && req->err != ERREQFLUSH) {
+		dprintk(DEBUG_MUX, "calling callback tcall %p rcall %p\n",
+			req->tcall, req->rcall);
+
+		(*req->cb) (req->cba, req->tcall, req->rcall, req->err);
+		req->cb = NULL;
 	} else
-		ret = 0;
+		kfree(req->rcall);
 
-      free_data:
-	kfree(data);
-	return ret;
+	v9fs_mux_put_tag(m, tag);
+
+	wake_up(&m->equeue);
+	kfree(req);
 }
 
 /**
- * v9fs_mux_rpc - send a request, receive a response
- * @v9ses: session info structure
- * @tcall: fcall to send
- * @rcall: buffer to place response into
- *
+ * v9fs_read_work - called when there is some data to be read from a transport
  */
-
-long
-v9fs_mux_rpc(struct v9fs_session_info *v9ses, struct v9fs_fcall *tcall,
-	     struct v9fs_fcall **rcall)
+static void v9fs_read_work(void *a)
 {
-	int tid = -1;
-	struct v9fs_fcall *fcall = NULL;
-	struct v9fs_rpcreq req;
-	int ret = -1;
-
-	if (!v9ses)
-		return -EINVAL;
-
-	if (!v9ses->transport || v9ses->transport->status != Connected)
-		return -EIO;
+	int n, err;
+	struct v9fs_mux_data *m;
+	struct v9fs_req *req, *rptr, *rreq;
+	struct v9fs_fcall *rcall;
+	char *rbuf;
+
+	m = a;
+
+	if (m->err < 0)
+		return;
+
+	rcall = NULL;
+	dprintk(DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
+
+	if (!m->rcall) {
+		m->rcall =
+		    kmalloc(sizeof(struct v9fs_fcall) + m->msize, GFP_KERNEL);
+		if (!m->rcall) {
+			err = -ENOMEM;
+			goto error;
+		}
 
-	if (rcall)
-		*rcall = NULL;
+		m->rbuf = (char *)m->rcall + sizeof(struct v9fs_fcall);
+		m->rpos = 0;
+	}
 
-	if (tcall->id != TVERSION) {
-		tid = v9fs_get_idpool(&v9ses->tidpool);
-		if (tid < 0)
-			return -ENOMEM;
+	clear_bit(Rpending, &m->wsched);
+	err = m->trans->read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos);
+	dprintk(DEBUG_MUX, "mux %p got %d bytes\n", m, err);
+	if (err == -EAGAIN) {
+		clear_bit(Rworksched, &m->wsched);
+		return;
 	}
 
-	tcall->tag = tid;
+	if (err <= 0)
+		goto error;
 
-	req.tcall = tcall;
-	req.err = 0;
-	req.rcall = NULL;
+	m->rpos += err;
+	while (m->rpos > 4) {
+		n = le32_to_cpu(*(__le32 *) m->rbuf);
+		if (n >= m->msize) {
+			dprintk(DEBUG_ERROR,
+				"requested packet size too big: %d\n", n);
+			err = -EIO;
+			goto error;
+		}
 
-	ret = v9fs_send(v9ses, &req);
+		if (m->rpos < n)
+			break;
 
-	if (ret < 0) {
-		if (tcall->id != TVERSION)
-			v9fs_put_idpool(tid, &v9ses->tidpool);
-		dprintk(DEBUG_MUX, "error %d\n", ret);
-		return ret;
-	}
+		dump_data(m->rbuf, n);
+		err =
+		    v9fs_deserialize_fcall(m->rbuf, n, m->rcall, *m->extended);
+		if (err < 0) {
+			goto error;
+		}
+
+		rcall = m->rcall;
+		rbuf = m->rbuf;
+		if (m->rpos > n) {
+			m->rcall = kmalloc(sizeof(struct v9fs_fcall) + m->msize,
+					   GFP_KERNEL);
+			if (!m->rcall) {
+				err = -ENOMEM;
+				goto error;
+			}
 
-	ret = v9fs_recv(v9ses, &req);
-
-	fcall = req.rcall;
-
-	dprintk(DEBUG_MUX, "received: tag=%x, ret=%d\n", tcall->tag, ret);
-	if (ret == -ERESTARTSYS) {
-		if (v9ses->transport->status != Disconnected
-		    && tcall->id != TFLUSH) {
-			unsigned long flags;
-
-			dprintk(DEBUG_MUX, "flushing the tag: %d\n",
-				tcall->tag);
-			clear_thread_flag(TIF_SIGPENDING);
-			v9fs_t_flush(v9ses, tcall->tag);
-			spin_lock_irqsave(&current->sighand->siglock, flags);
-			recalc_sigpending();
-			spin_unlock_irqrestore(&current->sighand->siglock,
-					       flags);
-			dprintk(DEBUG_MUX, "flushing done\n");
+			m->rbuf = (char *)m->rcall + sizeof(struct v9fs_fcall);
+			memmove(m->rbuf, rbuf + n, m->rpos - n);
+			m->rpos -= n;
+		} else {
+			m->rcall = NULL;
+			m->rbuf = NULL;
+			m->rpos = 0;
 		}
 
-		goto release_req;
-	} else if (ret < 0)
-		goto release_req;
-
-	if (!fcall)
-		ret = -EIO;
-	else {
-		if (fcall->id == RERROR) {
-			ret = v9fs_errstr2errno(fcall->params.rerror.error);
-			if (ret == 0) {	/* string match failed */
-				if (fcall->params.rerror.errno)
-					ret = -(fcall->params.rerror.errno);
-				else
-					ret = -ESERVERFAULT;
+		dprintk(DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, rcall->id,
+			rcall->tag);
+
+		req = NULL;
+		spin_lock(&m->lock);
+		list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
+			if (rreq->tag == rcall->tag) {
+				req = rreq;
+				req->rcall = rcall;
+				list_del(&req->req_list);
+				spin_unlock(&m->lock);
+				process_request(m, req);
+				break;
 			}
-		} else if (fcall->id != tcall->id + 1) {
-			dprintk(DEBUG_ERROR,
-				"fcall mismatch: expected %d, got %d\n",
-				tcall->id + 1, fcall->id);
-			ret = -EIO;
+
+		}
+
+		if (!req) {
+			spin_unlock(&m->lock);
+			if (err >= 0 && rcall->id != RFLUSH)
+				dprintk(DEBUG_ERROR,
+					"unexpected response mux %p id %d tag %d\n",
+					m, rcall->id, rcall->tag);
+			kfree(rcall);
 		}
 	}
 
-      release_req:
-	if (tcall->id != TVERSION)
-		v9fs_put_idpool(tid, &v9ses->tidpool);
-	if (rcall)
-		*rcall = fcall;
-	else
-		kfree(fcall);
+	if (!list_empty(&m->req_list)) {
+		if (test_and_clear_bit(Rpending, &m->wsched))
+			n = POLLIN;
+		else
+			n = m->trans->poll(m->trans, NULL);
+
+		if (n & POLLIN) {
+			dprintk(DEBUG_MUX, "schedule read work mux %p\n", m);
+			queue_work(v9fs_mux_wq, &m->rq);
+		} else
+			clear_bit(Rworksched, &m->wsched);
+	} else
+		clear_bit(Rworksched, &m->wsched);
+
+	return;
 
-	return ret;
+      error:
+	v9fs_mux_cancel(m, err);
+	clear_bit(Rworksched, &m->wsched);
 }
 
 /**
- * v9fs_mux_cancel_requests - cancels all pending requests
+ * v9fs_send_request - send 9P request
+ * The function can sleep until the request is scheduled for sending.
+ * The function can be interrupted. Return from the function is not
+ * a guarantee that the request is sent succesfully. Can return errors
+ * that can be retrieved by PTR_ERR macros.
  *
- * @v9ses: session info structure
- * @err: error code to return to the requests
+ * @m: mux data
+ * @tc: request to be sent
+ * @cb: callback function to call when response is received
+ * @cba: parameter to pass to the callback function
  */
-void v9fs_mux_cancel_requests(struct v9fs_session_info *v9ses, int err)
+static struct v9fs_req *v9fs_send_request(struct v9fs_mux_data *m,
+					  struct v9fs_fcall *tc,
+					  v9fs_mux_req_callback cb, void *cba)
 {
-	struct v9fs_rpcreq *rptr;
-	struct v9fs_rpcreq *rreq;
+	int n;
+	struct v9fs_req *req;
 
-	dprintk(DEBUG_MUX, " %d\n", err);
-	spin_lock(&v9ses->muxlock);
-	list_for_each_entry_safe(rreq, rptr, &v9ses->mux_fcalls, next) {
-		rreq->err = err;
-	}
-	spin_unlock(&v9ses->muxlock);
-	wake_up_all(&v9ses->read_wait);
-}
+	dprintk(DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
+		tc, tc->id);
+	if (m->err < 0)
+		return ERR_PTR(m->err);
 
-/**
- * v9fs_recvproc - kproc to handle demultiplexing responses
- * @data: session info structure
- *
- */
+	req = kmalloc(sizeof(struct v9fs_req), GFP_KERNEL);
+	if (!req)
+		return ERR_PTR(-ENOMEM);
 
-static int v9fs_recvproc(void *data)
-{
-	struct v9fs_session_info *v9ses = (struct v9fs_session_info *)data;
-	struct v9fs_fcall *rcall = NULL;
-	struct v9fs_rpcreq *rptr;
-	struct v9fs_rpcreq *req;
-	struct v9fs_rpcreq *rreq;
-	int err = 0;
+	if (tc->id == TVERSION)
+		n = V9FS_NOTAG;
+	else
+		n = v9fs_mux_get_tag(m);
 
-	allow_signal(SIGKILL);
-	set_current_state(TASK_INTERRUPTIBLE);
-	complete(&v9ses->proccmpl);
-	while (!kthread_should_stop() && err >= 0) {
-		req = rptr = rreq = NULL;
-
-		rcall = kmalloc(v9ses->maxdata + V9FS_IOHDRSZ, GFP_KERNEL);
-		if (!rcall) {
-			eprintk(KERN_ERR, "no memory for buffers\n");
-			break;
-		}
+	if (n < 0)
+		return ERR_PTR(-ENOMEM);
 
-		err = read_message(v9ses, rcall, v9ses->maxdata + V9FS_IOHDRSZ);
-		spin_lock(&v9ses->muxlock);
-		if (err < 0) {
-			list_for_each_entry_safe(rreq, rptr, &v9ses->mux_fcalls, next) {
-				rreq->err = err;
-			}
-			if(err != -ERESTARTSYS)
-				eprintk(KERN_ERR,
-					"Transport error while reading message %d\n", err);
-		} else {
-			list_for_each_entry_safe(rreq, rptr, &v9ses->mux_fcalls, next) {
-				if (rreq->tcall->tag == rcall->tag) {
-					req = rreq;
-					req->rcall = rcall;
-					break;
-				}
-			}
-		}
+	v9fs_set_tag(tc, n);
 
-		if (req && (req->tcall->id == TFLUSH)) {
-			struct v9fs_rpcreq *treq = NULL;
-			list_for_each_entry_safe(treq, rptr, &v9ses->mux_fcalls, next) {
-				if (treq->tcall->tag ==
-				    req->tcall->params.tflush.oldtag) {
-					list_del(&rptr->next);
-					kfree(treq->rcall);
-					break;
-				}
+	req->tag = n;
+	req->tcall = tc;
+	req->rcall = NULL;
+	req->err = 0;
+	req->cb = cb;
+	req->cba = cba;
+
+	spin_lock(&m->lock);
+	list_add_tail(&req->req_list, &m->unsent_req_list);
+	spin_unlock(&m->lock);
+
+	if (test_and_clear_bit(Wpending, &m->wsched))
+		n = POLLOUT;
+	else
+		n = m->trans->poll(m->trans, NULL);
+
+	if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
+		queue_work(v9fs_mux_wq, &m->wq);
+
+	return req;
+}
+
+static inline void
+v9fs_mux_flush_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc,
+		  int err)
+{
+	v9fs_mux_req_callback cb;
+	int tag;
+	struct v9fs_mux_data *m;
+	struct v9fs_req *req, *rptr;
+
+	m = a;
+	dprintk(DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, tc,
+		rc, err, tc->params.tflush.oldtag);
+
+	spin_lock(&m->lock);
+	cb = NULL;
+	tag = tc->params.tflush.oldtag;
+	list_for_each_entry_safe(req, rptr, &m->req_list, req_list) {
+		if (req->tag == tag) {
+			list_del(&req->req_list);
+			if (req->cb) {
+				cb = req->cb;
+				req->cb = NULL;
+				spin_unlock(&m->lock);
+				(*cb) (req->cba, req->tcall, req->rcall,
+				       req->err);
 			}
+			kfree(req);
+			wake_up(&m->equeue);
+			break;
 		}
+	}
 
-		spin_unlock(&v9ses->muxlock);
+	if (!cb)
+		spin_unlock(&m->lock);
 
-		if (!req) {
-			if (err >= 0)
-				dprintk(DEBUG_ERROR,
-					"unexpected response: id %d tag %d\n",
-					rcall->id, rcall->tag);
+	v9fs_mux_put_tag(m, tag);
+	kfree(tc);
+	kfree(rc);
+}
 
-			kfree(rcall);
-		}
+static void
+v9fs_mux_flush_request(struct v9fs_mux_data *m, struct v9fs_req *req)
+{
+	struct v9fs_fcall *fc;
 
-		wake_up_all(&v9ses->read_wait);
-		set_current_state(TASK_INTERRUPTIBLE);
+	dprintk(DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
+
+	fc = v9fs_create_tflush(req->tag);
+	v9fs_send_request(m, fc, v9fs_mux_flush_cb, m);
+}
+
+static void
+v9fs_mux_rpc_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc, int err)
+{
+	struct v9fs_mux_rpc *r;
+
+	if (err == ERREQFLUSH) {
+		dprintk(DEBUG_MUX, "err req flush\n");
+		return;
 	}
 
-	v9ses->transport->close(v9ses->transport);
+	r = a;
+	dprintk(DEBUG_MUX, "mux %p req %p tc %p rc %p err %d\n", r->m, r->req,
+		tc, rc, err);
+	r->rcall = rc;
+	r->err = err;
+	wake_up(&r->wqueue);
+}
 
-	/* Inform all pending processes about the failure */
-	wake_up_all(&v9ses->read_wait);
+/**
+ * v9fs_mux_rpc - sends 9P request and waits until a response is available.
+ *	The function can be interrupted.
+ * @m: mux data
+ * @tc: request to be sent
+ * @rc: pointer where a pointer to the response is stored
+ */
+int
+v9fs_mux_rpc(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
+	     struct v9fs_fcall **rc)
+{
+	int err;
+	unsigned long flags;
+	struct v9fs_req *req;
+	struct v9fs_mux_rpc r;
+
+	r.err = 0;
+	r.rcall = NULL;
+	r.m = m;
+	init_waitqueue_head(&r.wqueue);
+
+	if (rc)
+		*rc = NULL;
+
+	req = v9fs_send_request(m, tc, v9fs_mux_rpc_cb, &r);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		dprintk(DEBUG_MUX, "error %d\n", err);
+		return PTR_ERR(req);
+	}
 
-	if (signal_pending(current))
-		complete(&v9ses->proccmpl);
+	r.req = req;
+	dprintk(DEBUG_MUX, "mux %p tc %p tag %d rpc %p req %p\n", m, tc,
+		req->tag, &r, req);
+	err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0);
+	if (r.err < 0)
+		err = r.err;
+
+	if (err == -ERESTARTSYS && m->trans->status == Connected && m->err == 0) {
+		spin_lock(&m->lock);
+		req->tcall = NULL;
+		req->err = ERREQFLUSH;
+		spin_unlock(&m->lock);
+
+		clear_thread_flag(TIF_SIGPENDING);
+		v9fs_mux_flush_request(m, req);
+		spin_lock_irqsave(&current->sighand->siglock, flags);
+		recalc_sigpending();
+		spin_unlock_irqrestore(&current->sighand->siglock, flags);
+	}
 
-	dprintk(DEBUG_MUX, "recvproc: end\n");
-	v9ses->recvproc = NULL;
+	if (!err) {
+		if (r.rcall)
+			dprintk(DEBUG_MUX, "got response id %d tag %d\n",
+				r.rcall->id, r.rcall->tag);
+
+		if (rc)
+			*rc = r.rcall;
+		else
+			kfree(r.rcall);
+	} else {
+		kfree(r.rcall);
+		dprintk(DEBUG_MUX, "got error %d\n", err);
+		if (err > 0)
+			err = -EIO;
+	}
 
-	return err >= 0;
+	return err;
 }
 
 /**
- * v9fs_mux_init - initialize multiplexer (spawn kproc)
- * @v9ses: session info structure
- * @dev_name: mount device information (to create unique kproc)
- *
+ * v9fs_mux_rpcnb - sends 9P request without waiting for response.
+ * @m: mux data
+ * @tc: request to be sent
+ * @cb: callback function to be called when response arrives
+ * @cba: value to pass to the callback function
  */
+int v9fs_mux_rpcnb(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
+		   v9fs_mux_req_callback cb, void *a)
+{
+	int err;
+	struct v9fs_req *req;
+
+	req = v9fs_send_request(m, tc, cb, a);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		dprintk(DEBUG_MUX, "error %d\n", err);
+		return PTR_ERR(req);
+	}
+
+	dprintk(DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag);
+	return 0;
+}
 
-int v9fs_mux_init(struct v9fs_session_info *v9ses, const char *dev_name)
+/**
+ * v9fs_mux_cancel - cancel all pending requests with error
+ * @m: mux data
+ * @err: error code
+ */
+void v9fs_mux_cancel(struct v9fs_mux_data *m, int err)
 {
-	char procname[60];
-
-	strncpy(procname, dev_name, sizeof(procname));
-	procname[sizeof(procname) - 1] = 0;
-
-	init_waitqueue_head(&v9ses->read_wait);
-	init_completion(&v9ses->fcread);
-	init_completion(&v9ses->proccmpl);
-	spin_lock_init(&v9ses->muxlock);
-	INIT_LIST_HEAD(&v9ses->mux_fcalls);
-	v9ses->recvproc = NULL;
-	v9ses->curfcall = NULL;
-
-	v9ses->recvproc = kthread_create(v9fs_recvproc, v9ses,
-					 "v9fs_recvproc %s", procname);
-
-	if (IS_ERR(v9ses->recvproc)) {
-		eprintk(KERN_ERR, "cannot create receiving thread\n");
-		v9fs_session_close(v9ses);
-		return -ECONNABORTED;
+	struct v9fs_req *req, *rtmp;
+	LIST_HEAD(cancel_list);
+
+	dprintk(DEBUG_MUX, "mux %p err %d\n", m, err);
+	m->err = err;
+	spin_lock(&m->lock);
+	list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
+		list_move(&req->req_list, &cancel_list);
 	}
+	spin_unlock(&m->lock);
 
-	wake_up_process(v9ses->recvproc);
-	wait_for_completion(&v9ses->proccmpl);
+	list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
+		list_del(&req->req_list);
+		if (!req->err)
+			req->err = err;
 
-	return 0;
+		if (req->cb)
+			(*req->cb) (req->cba, req->tcall, req->rcall, req->err);
+		else
+			kfree(req->rcall);
+
+		kfree(req);
+	}
+
+	wake_up(&m->equeue);
+}
+
+static u16 v9fs_mux_get_tag(struct v9fs_mux_data *m)
+{
+	int tag;
+
+	tag = v9fs_get_idpool(&m->tidpool);
+	if (tag < 0)
+		return V9FS_NOTAG;
+	else
+		return (u16) tag;
+}
+
+static void v9fs_mux_put_tag(struct v9fs_mux_data *m, u16 tag)
+{
+	if (tag != V9FS_NOTAG && v9fs_check_idpool(tag, &m->tidpool))
+		v9fs_put_idpool(tag, &m->tidpool);
 }
diff --git a/fs/9p/mux.h b/fs/9p/mux.h
index 4994cb10badfef..9473b84f24b24e 100644
--- a/fs/9p/mux.h
+++ b/fs/9p/mux.h
@@ -3,6 +3,7 @@
  *
  * Multiplexer Definitions
  *
+ *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -23,19 +24,35 @@
  *
  */
 
-/* structure to manage each RPC transaction */
+struct v9fs_mux_data;
 
-struct v9fs_rpcreq {
-	struct v9fs_fcall *tcall;
-	struct v9fs_fcall *rcall;
-	int err;	/* error code if response failed */
+/**
+ * v9fs_mux_req_callback - callback function that is called when the
+ * response of a request is received. The callback is called from
+ * a workqueue and shouldn't block.
+ *
+ * @a - the pointer that was specified when the request was send to be
+ *      passed to the callback
+ * @tc - request call
+ * @rc - response call
+ * @err - error code (non-zero if error occured)
+ */
+typedef void (*v9fs_mux_req_callback)(void *a, struct v9fs_fcall *tc,
+	struct v9fs_fcall *rc, int err);
+
+int v9fs_mux_global_init(void);
+void v9fs_mux_global_exit(void);
 
-	/* XXX - could we put scatter/gather buffers here? */
+struct v9fs_mux_data *v9fs_mux_init(struct v9fs_transport *trans, int msize,
+	unsigned char *extended);
+void v9fs_mux_destroy(struct v9fs_mux_data *);
 
-	struct list_head next;
-};
+int v9fs_mux_send(struct v9fs_mux_data *m, struct v9fs_fcall *tc);
+struct v9fs_fcall *v9fs_mux_recv(struct v9fs_mux_data *m);
+int v9fs_mux_rpc(struct v9fs_mux_data *m, struct v9fs_fcall *tc, struct v9fs_fcall **rc);
+int v9fs_mux_rpcnb(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
+	v9fs_mux_req_callback cb, void *a);
 
-int v9fs_mux_init(struct v9fs_session_info *v9ses, const char *dev_name);
-long v9fs_mux_rpc(struct v9fs_session_info *v9ses,
-		  struct v9fs_fcall *tcall, struct v9fs_fcall **rcall);
-void v9fs_mux_cancel_requests(struct v9fs_session_info *v9ses, int err);
+void v9fs_mux_flush(struct v9fs_mux_data *m, int sendflush);
+void v9fs_mux_cancel(struct v9fs_mux_data *m, int err);
+int v9fs_errstr2errno(char *errstr, int len);
diff --git a/fs/9p/trans_fd.c b/fs/9p/trans_fd.c
index 63b58ce98ff45c..1a28ef97a3d116 100644
--- a/fs/9p/trans_fd.c
+++ b/fs/9p/trans_fd.c
@@ -3,6 +3,7 @@
  *
  * File Descriptor Transport Layer
  *
+ *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
  *  Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -106,9 +107,6 @@ v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
 		return -ENOPROTOOPT;
 	}
 
-	sema_init(&trans->writelock, 1);
-	sema_init(&trans->readlock, 1);
-
 	ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
 
 	if (!ts)
@@ -148,12 +146,12 @@ static void v9fs_fd_close(struct v9fs_transport *trans)
 	if (!trans)
 		return;
 
-	trans->status = Disconnected;
-	ts = trans->priv;
+	ts = xchg(&trans->priv, NULL);
 
 	if (!ts)
 		return;
 
+	trans->status = Disconnected;
 	if (ts->in_file)
 		fput(ts->in_file);
 
@@ -163,10 +161,55 @@ static void v9fs_fd_close(struct v9fs_transport *trans)
 	kfree(ts);
 }
 
+static unsigned int
+v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
+{
+	int ret, n;
+	struct v9fs_trans_fd *ts;
+	mm_segment_t oldfs;
+
+	if (!trans)
+		return -EIO;
+
+	ts = trans->priv;
+	if (trans->status != Connected || !ts)
+		return -EIO;
+
+	oldfs = get_fs();
+	set_fs(get_ds());
+
+	if (!ts->in_file->f_op || !ts->in_file->f_op->poll) {
+		ret = -EIO;
+		goto end;
+	}
+
+	ret = ts->in_file->f_op->poll(ts->in_file, pt);
+
+	if (ts->out_file != ts->in_file) {
+		if (!ts->out_file->f_op || !ts->out_file->f_op->poll) {
+			ret = -EIO;
+			goto end;
+		}
+
+		n = ts->out_file->f_op->poll(ts->out_file, pt);
+
+		ret &= ~POLLOUT;
+		n &= ~POLLIN;
+
+		ret |= n;
+	}
+
+end:
+	set_fs(oldfs);
+	return ret;
+}
+
+
 struct v9fs_transport v9fs_trans_fd = {
 	.init = v9fs_fd_init,
 	.write = v9fs_fd_send,
 	.read = v9fs_fd_recv,
 	.close = v9fs_fd_close,
+	.poll = v9fs_fd_poll,
 };
 
diff --git a/fs/9p/trans_sock.c b/fs/9p/trans_sock.c
index 6a9a75d40f735c..44e830697acb04 100644
--- a/fs/9p/trans_sock.c
+++ b/fs/9p/trans_sock.c
@@ -3,6 +3,7 @@
  *
  * Socket Transport Layer
  *
+ *  Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  *  Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
  *  Copyright (C) 1995, 1996 by Olaf Kirch <okir@monad.swb.de>
@@ -36,6 +37,7 @@
 #include <asm/uaccess.h>
 #include <linux/inet.h>
 #include <linux/idr.h>
+#include <linux/file.h>
 
 #include "debug.h"
 #include "v9fs.h"
@@ -45,6 +47,7 @@
 
 struct v9fs_trans_sock {
 	struct socket *s;
+	struct file *filp;
 };
 
 /**
@@ -57,41 +60,26 @@ struct v9fs_trans_sock {
 
 static int v9fs_sock_recv(struct v9fs_transport *trans, void *v, int len)
 {
-	struct msghdr msg;
-	struct kvec iov;
-	int result;
-	mm_segment_t oldfs;
-	struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
+	int ret;
+	struct v9fs_trans_sock *ts;
 
-	if (trans->status == Disconnected)
+	if (!trans || trans->status == Disconnected) {
+		dprintk(DEBUG_ERROR, "disconnected ...\n");
 		return -EREMOTEIO;
+	}
 
-	result = -EINVAL;
-
-	oldfs = get_fs();
-	set_fs(get_ds());
-
-	iov.iov_base = v;
-	iov.iov_len = len;
-	msg.msg_name = NULL;
-	msg.msg_namelen = 0;
-	msg.msg_iovlen = 1;
-	msg.msg_control = NULL;
-	msg.msg_controllen = 0;
-	msg.msg_namelen = 0;
-	msg.msg_flags = MSG_NOSIGNAL;
+	ts = trans->priv;
 
-	result = kernel_recvmsg(ts->s, &msg, &iov, 1, len, 0);
+	if (!(ts->filp->f_flags & O_NONBLOCK))
+		dprintk(DEBUG_ERROR, "blocking read ...\n");
 
-	dprintk(DEBUG_TRANS, "socket state %d\n", ts->s->state);
-	set_fs(oldfs);
-
-	if (result <= 0) {
-		if (result != -ERESTARTSYS)
+	ret = kernel_read(ts->filp, ts->filp->f_pos, v, len);
+	if (ret <= 0) {
+		if (ret != -ERESTARTSYS && ret != -EAGAIN)
 			trans->status = Disconnected;
 	}
 
-	return result;
+	return ret;
 }
 
 /**
@@ -104,40 +92,72 @@ static int v9fs_sock_recv(struct v9fs_transport *trans, void *v, int len)
 
 static int v9fs_sock_send(struct v9fs_transport *trans, void *v, int len)
 {
-	struct kvec iov;
-	struct msghdr msg;
-	int result = -1;
+	int ret;
 	mm_segment_t oldfs;
-	struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
+	struct v9fs_trans_sock *ts;
 
-	dprintk(DEBUG_TRANS, "Sending packet size %d (%x)\n", len, len);
-	dump_data(v, len);
+	if (!trans || trans->status == Disconnected) {
+		dprintk(DEBUG_ERROR, "disconnected ...\n");
+		return -EREMOTEIO;
+	}
+
+	ts = trans->priv;
+	if (!ts) {
+		dprintk(DEBUG_ERROR, "no transport ...\n");
+		return -EREMOTEIO;
+	}
 
-	down(&trans->writelock);
+	if (!(ts->filp->f_flags & O_NONBLOCK))
+		dprintk(DEBUG_ERROR, "blocking write ...\n");
 
 	oldfs = get_fs();
 	set_fs(get_ds());
-	iov.iov_base = v;
-	iov.iov_len = len;
-	msg.msg_name = NULL;
-	msg.msg_namelen = 0;
-	msg.msg_iovlen = 1;
-	msg.msg_control = NULL;
-	msg.msg_controllen = 0;
-	msg.msg_namelen = 0;
-	msg.msg_flags = MSG_NOSIGNAL;
-	result = kernel_sendmsg(ts->s, &msg, &iov, 1, len);
+	ret = vfs_write(ts->filp, (void __user *)v, len, &ts->filp->f_pos);
 	set_fs(oldfs);
 
-	if (result < 0) {
-		if (result != -ERESTARTSYS)
+	if (ret < 0) {
+		if (ret != -ERESTARTSYS)
 			trans->status = Disconnected;
 	}
 
-	up(&trans->writelock);
-	return result;
+	return ret;
+}
+
+static unsigned int v9fs_sock_poll(struct v9fs_transport *trans,
+	struct poll_table_struct *pt) {
+
+	int ret;
+	struct v9fs_trans_sock *ts;
+	mm_segment_t oldfs;
+
+	if (!trans) {
+		dprintk(DEBUG_ERROR, "no transport\n");
+		return -EIO;
+	}
+
+	ts = trans->priv;
+	if (trans->status != Connected || !ts) {
+		dprintk(DEBUG_ERROR, "transport disconnected: %d\n", trans->status);
+		return -EIO;
+	}
+
+	oldfs = get_fs();
+	set_fs(get_ds());
+
+	if (!ts->filp->f_op || !ts->filp->f_op->poll) {
+		dprintk(DEBUG_ERROR, "no poll operation\n");
+		ret = -EIO;
+		goto end;
+	}
+
+	ret = ts->filp->f_op->poll(ts->filp, pt);
+
+end:
+	set_fs(oldfs);
+	return ret;
 }
 
+
 /**
  * v9fs_tcp_init - initialize TCP socket
  * @v9ses: session information
@@ -154,9 +174,9 @@ v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
 	int rc = 0;
 	struct v9fs_trans_sock *ts = NULL;
 	struct v9fs_transport *trans = v9ses->transport;
+	int fd;
 
-	sema_init(&trans->writelock, 1);
-	sema_init(&trans->readlock, 1);
+	trans->status = Disconnected;
 
 	ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
 
@@ -165,6 +185,7 @@ v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
 
 	trans->priv = ts;
 	ts->s = NULL;
+	ts->filp = NULL;
 
 	if (!addr)
 		return -EINVAL;
@@ -185,7 +206,18 @@ v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
 		return rc;
 	}
 	csocket->sk->sk_allocation = GFP_NOIO;
+
+	fd = sock_map_fd(csocket);
+	if (fd < 0) {
+		sock_release(csocket);
+		kfree(ts);
+		trans->priv = NULL;
+		return fd;
+	}
+
 	ts->s = csocket;
+	ts->filp = fget(fd);
+	ts->filp->f_flags |= O_NONBLOCK;
 	trans->status = Connected;
 
 	return 0;
@@ -203,7 +235,7 @@ static int
 v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
 	       char *data)
 {
-	int rc;
+	int rc, fd;
 	struct socket *csocket;
 	struct sockaddr_un sun_server;
 	struct v9fs_transport *trans;
@@ -213,6 +245,8 @@ v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
 	csocket = NULL;
 	trans = v9ses->transport;
 
+	trans->status = Disconnected;
+
 	if (strlen(dev_name) > UNIX_PATH_MAX) {
 		eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
 			dev_name);
@@ -225,9 +259,7 @@ v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
 
 	trans->priv = ts;
 	ts->s = NULL;
-
-	sema_init(&trans->writelock, 1);
-	sema_init(&trans->readlock, 1);
+	ts->filp = NULL;
 
 	sun_server.sun_family = PF_UNIX;
 	strcpy(sun_server.sun_path, dev_name);
@@ -241,7 +273,18 @@ v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
 		return rc;
 	}
 	csocket->sk->sk_allocation = GFP_NOIO;
+
+	fd = sock_map_fd(csocket);
+	if (fd < 0) {
+		sock_release(csocket);
+		kfree(ts);
+		trans->priv = NULL;
+		return fd;
+	}
+
 	ts->s = csocket;
+	ts->filp = fget(fd);
+	ts->filp->f_flags |= O_NONBLOCK;
 	trans->status = Connected;
 
 	return 0;
@@ -262,12 +305,11 @@ static void v9fs_sock_close(struct v9fs_transport *trans)
 
 	ts = trans->priv;
 
-	if ((ts) && (ts->s)) {
-		dprintk(DEBUG_TRANS, "closing the socket %p\n", ts->s);
-		sock_release(ts->s);
+	if ((ts) && (ts->filp)) {
+		fput(ts->filp);
+		ts->filp = NULL;
 		ts->s = NULL;
 		trans->status = Disconnected;
-		dprintk(DEBUG_TRANS, "socket closed\n");
 	}
 
 	kfree(ts);
@@ -280,6 +322,7 @@ struct v9fs_transport v9fs_trans_tcp = {
 	.write = v9fs_sock_send,
 	.read = v9fs_sock_recv,
 	.close = v9fs_sock_close,
+	.poll = v9fs_sock_poll,
 };
 
 struct v9fs_transport v9fs_trans_unix = {
@@ -287,4 +330,5 @@ struct v9fs_transport v9fs_trans_unix = {
 	.write = v9fs_sock_send,
 	.read = v9fs_sock_recv,
 	.close = v9fs_sock_close,
+	.poll = v9fs_sock_poll,
 };
diff --git a/fs/9p/transport.h b/fs/9p/transport.h
index 9e9cd418efd54c..91fcdb94b361be 100644
--- a/fs/9p/transport.h
+++ b/fs/9p/transport.h
@@ -3,6 +3,7 @@
  *
  * Transport Definition
  *
+ *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -31,14 +32,13 @@ enum v9fs_transport_status {
 
 struct v9fs_transport {
 	enum v9fs_transport_status status;
-	struct semaphore writelock;
-	struct semaphore readlock;
 	void *priv;
 
 	int (*init) (struct v9fs_session_info *, const char *, char *);
 	int (*write) (struct v9fs_transport *, void *, int);
 	int (*read) (struct v9fs_transport *, void *, int);
 	void (*close) (struct v9fs_transport *);
+	unsigned int (*poll)(struct v9fs_transport *, struct poll_table_struct *);
 };
 
 extern struct v9fs_transport v9fs_trans_tcp;
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 418c3743fdee85..5250c428fc1f0b 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -37,7 +37,6 @@
 #include "v9fs_vfs.h"
 #include "transport.h"
 #include "mux.h"
-#include "conv.h"
 
 /* TODO: sysfs or debugfs interface */
 int v9fs_debug_level = 0;	/* feature-rific global debug level  */
@@ -213,7 +212,8 @@ retry:
 		return -1;
 	}
 
-	error = idr_get_new(&p->pool, NULL, &i);
+	/* no need to store exactly p, we just need something non-null */
+	error = idr_get_new(&p->pool, p, &i);
 	up(&p->lock);
 
 	if (error == -EAGAIN)
@@ -243,6 +243,16 @@ void v9fs_put_idpool(int id, struct v9fs_idpool *p)
 }
 
 /**
+ * v9fs_check_idpool - check if the specified id is available
+ * @id - id to check
+ * @p - pool
+ */
+int v9fs_check_idpool(int id, struct v9fs_idpool *p)
+{
+	return idr_find(&p->pool, id) != NULL;
+}
+
+/**
  * v9fs_session_init - initialize session
  * @v9ses: session information structure
  * @dev_name: device being mounted
@@ -259,6 +269,7 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
 	int n = 0;
 	int newfid = -1;
 	int retval = -EINVAL;
+	struct v9fs_str *version;
 
 	v9ses->name = __getname();
 	if (!v9ses->name)
@@ -281,9 +292,6 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
 	/* id pools that are session-dependent: FIDs and TIDs */
 	idr_init(&v9ses->fidpool.pool);
 	init_MUTEX(&v9ses->fidpool.lock);
-	idr_init(&v9ses->tidpool.pool);
-	init_MUTEX(&v9ses->tidpool.lock);
-
 
 	switch (v9ses->proto) {
 	case PROTO_TCP:
@@ -320,7 +328,12 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
 	v9ses->shutdown = 0;
 	v9ses->session_hung = 0;
 
-	if ((retval = v9fs_mux_init(v9ses, dev_name)) < 0) {
+	v9ses->mux = v9fs_mux_init(v9ses->transport, v9ses->maxdata + V9FS_IOHDRSZ,
+		&v9ses->extended);
+
+	if (IS_ERR(v9ses->mux)) {
+		retval = PTR_ERR(v9ses->mux);
+		v9ses->mux = NULL;
 		dprintk(DEBUG_ERROR, "problem initializing mux\n");
 		goto SessCleanUp;
 	}
@@ -339,13 +352,16 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
 			goto FreeFcall;
 		}
 
-		/* Really should check for 9P1 and report error */
-		if (!strcmp(fcall->params.rversion.version, "9P2000.u")) {
+		version = &fcall->params.rversion.version;
+		if (version->len==8 && !memcmp(version->str, "9P2000.u", 8)) {
 			dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
 			v9ses->extended = 1;
-		} else {
+		} else if (version->len==6 && !memcmp(version->str, "9P2000", 6)) {
 			dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
 			v9ses->extended = 0;
+		} else {
+			retval = -EREMOTEIO;
+			goto FreeFcall;
 		}
 
 		n = fcall->params.rversion.msize;
@@ -381,7 +397,7 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
 	}
 
 	if (v9ses->afid != ~0) {
-		if (v9fs_t_clunk(v9ses, v9ses->afid, NULL))
+		if (v9fs_t_clunk(v9ses, v9ses->afid))
 			dprintk(DEBUG_ERROR, "clunk failed\n");
 	}
 
@@ -403,13 +419,16 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
 
 void v9fs_session_close(struct v9fs_session_info *v9ses)
 {
-	if (v9ses->recvproc) {
-		send_sig(SIGKILL, v9ses->recvproc, 1);
-		wait_for_completion(&v9ses->proccmpl);
+	if (v9ses->mux) {
+		v9fs_mux_destroy(v9ses->mux);
+		v9ses->mux = NULL;
 	}
 
-	if (v9ses->transport)
+	if (v9ses->transport) {
 		v9ses->transport->close(v9ses->transport);
+		kfree(v9ses->transport);
+		v9ses->transport = NULL;
+	}
 
 	__putname(v9ses->name);
 	__putname(v9ses->remotename);
@@ -420,8 +439,9 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
  * 	and cancel all pending requests.
  */
 void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
+	dprintk(DEBUG_ERROR, "cancel session %p\n", v9ses);
 	v9ses->transport->status = Disconnected;
-	v9fs_mux_cancel_requests(v9ses, -EIO);
+	v9fs_mux_cancel(v9ses->mux, -EIO);
 }
 
 extern int v9fs_error_init(void);
@@ -433,11 +453,17 @@ extern int v9fs_error_init(void);
 
 static int __init init_v9fs(void)
 {
+	int ret;
+
 	v9fs_error_init();
 
 	printk(KERN_INFO "Installing v9fs 9P2000 file system support\n");
 
-	return register_filesystem(&v9fs_fs_type);
+	ret = v9fs_mux_global_init();
+	if (!ret)
+		ret = register_filesystem(&v9fs_fs_type);
+
+	return ret;
 }
 
 /**
@@ -447,6 +473,7 @@ static int __init init_v9fs(void)
 
 static void __exit exit_v9fs(void)
 {
+	v9fs_mux_global_exit();
 	unregister_filesystem(&v9fs_fs_type);
 }
 
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 45dcef42bdd63b..f337da7a0eec1c 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -57,24 +57,14 @@ struct v9fs_session_info {
 
 	/* book keeping */
 	struct v9fs_idpool fidpool;	/* The FID pool for file descriptors */
-	struct v9fs_idpool tidpool;	/* The TID pool for transactions ids */
 
-	/* transport information */
 	struct v9fs_transport *transport;
+	struct v9fs_mux_data *mux;
 
 	int inprogress;		/* session in progress => true */
 	int shutdown;		/* session shutting down. no more attaches. */
 	unsigned char session_hung;
-
-	/* mux private data */
-	struct v9fs_fcall *curfcall;
-	wait_queue_head_t read_wait;
-	struct completion fcread;
-	struct completion proccmpl;
-	struct task_struct *recvproc;
-
-	spinlock_t muxlock;
-	struct list_head mux_fcalls;
+	struct dentry *debugfs_dir;
 };
 
 /* possible values of ->proto */
@@ -84,11 +74,14 @@ enum {
 	PROTO_FD,
 };
 
+extern struct dentry *v9fs_debugfs_root;
+
 int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
 struct v9fs_session_info *v9fs_inode2v9ses(struct inode *);
 void v9fs_session_close(struct v9fs_session_info *v9ses);
 int v9fs_get_idpool(struct v9fs_idpool *p);
 void v9fs_put_idpool(int id, struct v9fs_idpool *p);
+int v9fs_check_idpool(int id, struct v9fs_idpool *p);
 void v9fs_session_cancel(struct v9fs_session_info *v9ses);
 
 #define V9FS_MAGIC 0x01021997
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index 2f2cea7ee3e712..c78502ad00ed3d 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -45,9 +45,8 @@ extern struct dentry_operations v9fs_dentry_operations;
 
 struct inode *v9fs_get_inode(struct super_block *sb, int mode);
 ino_t v9fs_qid2ino(struct v9fs_qid *qid);
-void v9fs_mistat2inode(struct v9fs_stat *, struct inode *,
-		       struct super_block *);
+void v9fs_stat2inode(struct v9fs_stat *, struct inode *, struct super_block *);
 int v9fs_dir_release(struct inode *inode, struct file *filp);
 int v9fs_file_open(struct inode *inode, struct file *file);
-void v9fs_inode2mistat(struct inode *inode, struct v9fs_stat *mistat);
+void v9fs_inode2stat(struct inode *inode, struct v9fs_stat *stat);
 void v9fs_dentry_release(struct dentry *);
diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c
index a6aa947de0f9b7..2dd806dac9f192 100644
--- a/fs/9p/vfs_dentry.c
+++ b/fs/9p/vfs_dentry.c
@@ -40,7 +40,6 @@
 #include "v9fs.h"
 #include "9p.h"
 #include "v9fs_vfs.h"
-#include "conv.h"
 #include "fid.h"
 
 /**
@@ -95,24 +94,22 @@ static int v9fs_dentry_validate(struct dentry *dentry, struct nameidata *nd)
 
 void v9fs_dentry_release(struct dentry *dentry)
 {
+	int err;
+
 	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
 
 	if (dentry->d_fsdata != NULL) {
 		struct list_head *fid_list = dentry->d_fsdata;
 		struct v9fs_fid *temp = NULL;
 		struct v9fs_fid *current_fid = NULL;
-		struct v9fs_fcall *fcall = NULL;
 
 		list_for_each_entry_safe(current_fid, temp, fid_list, list) {
-			if (v9fs_t_clunk
-			    (current_fid->v9ses, current_fid->fid, &fcall))
-				dprintk(DEBUG_ERROR, "clunk failed: %s\n",
-					FCALL_ERROR(fcall));
+			err = v9fs_t_clunk(current_fid->v9ses, current_fid->fid);
 
-			v9fs_put_idpool(current_fid->fid,
-					&current_fid->v9ses->fidpool);
+			if (err < 0)
+				dprintk(DEBUG_ERROR, "clunk failed: %d name %s\n",
+					err, dentry->d_iname);
 
-			kfree(fcall);
 			v9fs_fid_destroy(current_fid);
 		}
 
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 57a43b8feef56e..ae6d032b9b59f9 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -37,8 +37,8 @@
 #include "debug.h"
 #include "v9fs.h"
 #include "9p.h"
-#include "v9fs_vfs.h"
 #include "conv.h"
+#include "v9fs_vfs.h"
 #include "fid.h"
 
 /**
@@ -74,20 +74,16 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	struct inode *inode = filp->f_dentry->d_inode;
 	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
 	struct v9fs_fid *file = filp->private_data;
-	unsigned int i, n;
+	unsigned int i, n, s;
 	int fid = -1;
 	int ret = 0;
-	struct v9fs_stat *mi = NULL;
+	struct v9fs_stat stat;
 	int over = 0;
 
 	dprintk(DEBUG_VFS, "name %s\n", filp->f_dentry->d_name.name);
 
 	fid = file->fid;
 
-	mi = kmalloc(v9ses->maxdata, GFP_KERNEL);
-	if (!mi)
-		return -ENOMEM;
-
 	if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) {
 		kfree(file->rdir_fcall);
 		file->rdir_fcall = NULL;
@@ -97,20 +93,20 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 		n = file->rdir_fcall->params.rread.count;
 		i = file->rdir_fpos;
 		while (i < n) {
-			int s = v9fs_deserialize_stat(v9ses,
-				  file->rdir_fcall->params.rread.data + i,
-			          n - i, mi, v9ses->maxdata);
+			s = v9fs_deserialize_stat(
+				file->rdir_fcall->params.rread.data + i,
+				n - i, &stat, v9ses->extended);
 
 			if (s == 0) {
 				dprintk(DEBUG_ERROR,
-					"error while deserializing mistat\n");
+					"error while deserializing stat\n");
 				ret = -EIO;
 				goto FreeStructs;
 			}
 
-			over = filldir(dirent, mi->name, strlen(mi->name),
-				    filp->f_pos, v9fs_qid2ino(&mi->qid),
-				    dt_type(mi));
+			over = filldir(dirent, stat.name.str, stat.name.len,
+				    filp->f_pos, v9fs_qid2ino(&stat.qid),
+				    dt_type(&stat));
 
 			if (over) {
 				file->rdir_fpos = i;
@@ -130,7 +126,7 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 
 	while (!over) {
 		ret = v9fs_t_read(v9ses, fid, filp->f_pos,
-					    v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
+			v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
 		if (ret < 0) {
 			dprintk(DEBUG_ERROR, "error while reading: %d: %p\n",
 				ret, fcall);
@@ -141,19 +137,18 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 		n = ret;
 		i = 0;
 		while (i < n) {
-			int s = v9fs_deserialize_stat(v9ses,
-			          fcall->params.rread.data + i, n - i, mi,
-			          v9ses->maxdata);
+			s = v9fs_deserialize_stat(fcall->params.rread.data + i,
+				n - i, &stat, v9ses->extended);
 
 			if (s == 0) {
 				dprintk(DEBUG_ERROR,
-					"error while deserializing mistat\n");
+					"error while deserializing stat\n");
 				return -EIO;
 			}
 
-			over = filldir(dirent, mi->name, strlen(mi->name),
-				    filp->f_pos, v9fs_qid2ino(&mi->qid),
-				    dt_type(mi));
+			over = filldir(dirent, stat.name.str, stat.name.len,
+				    filp->f_pos, v9fs_qid2ino(&stat.qid),
+				    dt_type(&stat));
 
 			if (over) {
 				file->rdir_fcall = fcall;
@@ -172,7 +167,6 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 
       FreeStructs:
 	kfree(fcall);
-	kfree(mi);
 	return ret;
 }
 
@@ -193,18 +187,15 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
 		fid->fid);
 	fidnum = fid->fid;
 
-	filemap_fdatawrite(inode->i_mapping);
-	filemap_fdatawait(inode->i_mapping);
+	filemap_write_and_wait(inode->i_mapping);
 
 	if (fidnum >= 0) {
 		dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
 			fid->fid);
 
-		if (v9fs_t_clunk(v9ses, fidnum, NULL))
+		if (v9fs_t_clunk(v9ses, fidnum))
 			dprintk(DEBUG_ERROR, "clunk failed\n");
 
-		v9fs_put_idpool(fid->fid, &v9ses->fidpool);
-
 		kfree(fid->rdir_fcall);
 		kfree(fid);
 
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 89c849da85040e..6852f0eb96ed3a 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -32,6 +32,7 @@
 #include <linux/string.h>
 #include <linux/smp_lock.h>
 #include <linux/inet.h>
+#include <linux/version.h>
 #include <linux/list.h>
 #include <asm/uaccess.h>
 #include <linux/idr.h>
@@ -117,9 +118,7 @@ int v9fs_file_open(struct inode *inode, struct file *file)
 
 		result = v9fs_t_open(v9ses, newfid, open_mode, &fcall);
 		if (result < 0) {
-			dprintk(DEBUG_ERROR,
-				"open failed, open_mode 0x%x: %s\n", open_mode,
-				FCALL_ERROR(fcall));
+			PRINT_FCALL_ERROR("open failed", fcall);
 			kfree(fcall);
 			return result;
 		}
@@ -165,8 +164,7 @@ static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
 		return -ENOLCK;
 
 	if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
-		filemap_fdatawrite(inode->i_mapping);
-		filemap_fdatawait(inode->i_mapping);
+		filemap_write_and_wait(inode->i_mapping);
 		invalidate_inode_pages(&inode->i_data);
 	}
 
@@ -257,7 +255,6 @@ v9fs_file_write(struct file *filp, const char __user * data,
 	int result = -EIO;
 	int rsize = 0;
 	int total = 0;
-	char *buf;
 
 	dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count,
 		(int)*offset);
@@ -265,28 +262,14 @@ v9fs_file_write(struct file *filp, const char __user * data,
 	if (v9fid->iounit != 0 && rsize > v9fid->iounit)
 		rsize = v9fid->iounit;
 
-	buf = kmalloc(v9ses->maxdata - V9FS_IOHDRSZ, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
 	do {
 		if (count < rsize)
 			rsize = count;
 
-		result = copy_from_user(buf, data, rsize);
-		if (result) {
-			dprintk(DEBUG_ERROR, "Problem copying from user\n");
-			kfree(buf);
-			return -EFAULT;
-		}
-
-		dump_data(buf, rsize);
-		result = v9fs_t_write(v9ses, fid, *offset, rsize, buf, &fcall);
+		result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall);
 		if (result < 0) {
-			eprintk(KERN_ERR, "error while writing: %s(%d)\n",
-				FCALL_ERROR(fcall), result);
+			PRINT_FCALL_ERROR("error while writing", fcall);
 			kfree(fcall);
-			kfree(buf);
 			return result;
 		} else
 			*offset += result;
@@ -306,7 +289,6 @@ v9fs_file_write(struct file *filp, const char __user * data,
 		total += result;
 	} while (count);
 
-	kfree(buf);
 	return total;
 }
 
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 0ea965c3bb7d0d..d933ef1fbd8ac4 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -40,7 +40,6 @@
 #include "v9fs.h"
 #include "9p.h"
 #include "v9fs_vfs.h"
-#include "conv.h"
 #include "fid.h"
 
 static struct inode_operations v9fs_dir_inode_operations;
@@ -127,100 +126,32 @@ static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
 }
 
 /**
- * v9fs_blank_mistat - helper function to setup a 9P stat structure
+ * v9fs_blank_wstat - helper function to setup a 9P stat structure
  * @v9ses: 9P session info (for determining extended mode)
- * @mistat: structure to initialize
+ * @wstat: structure to initialize
  *
  */
 
 static void
-v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat)
+v9fs_blank_wstat(struct v9fs_wstat *wstat)
 {
-	mistat->type = ~0;
-	mistat->dev = ~0;
-	mistat->qid.type = ~0;
-	mistat->qid.version = ~0;
-	*((long long *)&mistat->qid.path) = ~0;
-	mistat->mode = ~0;
-	mistat->atime = ~0;
-	mistat->mtime = ~0;
-	mistat->length = ~0;
-	mistat->name = mistat->data;
-	mistat->uid = mistat->data;
-	mistat->gid = mistat->data;
-	mistat->muid = mistat->data;
-	if (v9ses->extended) {
-		mistat->n_uid = ~0;
-		mistat->n_gid = ~0;
-		mistat->n_muid = ~0;
-		mistat->extension = mistat->data;
-	}
-	*mistat->data = 0;
-}
-
-/**
- * v9fs_mistat2unix - convert mistat to unix stat
- * @mistat: Plan 9 metadata (mistat) structure
- * @buf: unix metadata (stat) structure to populate
- * @sb: superblock
- *
- */
-
-static void
-v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf,
-		 struct super_block *sb)
-{
-	struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL;
-
-	buf->st_nlink = 1;
-
-	buf->st_atime = mistat->atime;
-	buf->st_mtime = mistat->mtime;
-	buf->st_ctime = mistat->mtime;
-
-	buf->st_uid = (unsigned short)-1;
-	buf->st_gid = (unsigned short)-1;
-
-	if (v9ses && v9ses->extended) {
-		/* TODO: string to uid mapping via user-space daemon */
-		if (mistat->n_uid != -1)
-			sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
-
-		if (mistat->n_gid != -1)
-			sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
-	}
-
-	if (buf->st_uid == (unsigned short)-1)
-		buf->st_uid = v9ses->uid;
-	if (buf->st_gid == (unsigned short)-1)
-		buf->st_gid = v9ses->gid;
-
-	buf->st_mode = p9mode2unixmode(v9ses, mistat->mode);
-	if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) {
-		char type = 0;
-		int major = -1;
-		int minor = -1;
-		sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
-		switch (type) {
-		case 'c':
-			buf->st_mode &= ~S_IFBLK;
-			buf->st_mode |= S_IFCHR;
-			break;
-		case 'b':
-			break;
-		default:
-			dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
-				type, mistat->extension);
-		};
-		buf->st_rdev = MKDEV(major, minor);
-	} else
-		buf->st_rdev = 0;
-
-	buf->st_size = mistat->length;
-
-	buf->st_blksize = sb->s_blocksize;
-	buf->st_blocks =
-	    (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits;
+	wstat->type = ~0;
+	wstat->dev = ~0;
+	wstat->qid.type = ~0;
+	wstat->qid.version = ~0;
+	*((long long *)&wstat->qid.path) = ~0;
+	wstat->mode = ~0;
+	wstat->atime = ~0;
+	wstat->mtime = ~0;
+	wstat->length = ~0;
+	wstat->name = NULL;
+	wstat->uid = NULL;
+	wstat->gid = NULL;
+	wstat->muid = NULL;
+	wstat->n_uid = ~0;
+	wstat->n_gid = ~0;
+	wstat->n_muid = ~0;
+	wstat->extension = NULL;
 }
 
 /**
@@ -312,12 +243,12 @@ v9fs_create(struct inode *dir,
 	struct inode *file_inode = NULL;
 	struct v9fs_fcall *fcall = NULL;
 	struct v9fs_qid qid;
-	struct stat newstat;
 	int dirfidnum = -1;
 	long newfid = -1;
 	int result = 0;
 	unsigned int iounit = 0;
 	int wfidno = -1;
+	int err;
 
 	perm = unixmode2p9mode(v9ses, perm);
 
@@ -349,57 +280,64 @@ v9fs_create(struct inode *dir,
 
 	result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
 	if (result < 0) {
-		dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
+		PRINT_FCALL_ERROR("clone error", fcall);
 		v9fs_put_idpool(newfid, &v9ses->fidpool);
 		newfid = -1;
 		goto CleanUpFid;
 	}
 
 	kfree(fcall);
+	fcall = NULL;
 
 	result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
 			       perm, open_mode, &fcall);
 	if (result < 0) {
-		dprintk(DEBUG_ERROR, "create fails: %s(%d)\n",
-			FCALL_ERROR(fcall), result);
-
+		PRINT_FCALL_ERROR("create fails", fcall);
 		goto CleanUpFid;
 	}
 
 	iounit = fcall->params.rcreate.iounit;
 	qid = fcall->params.rcreate.qid;
 	kfree(fcall);
+	fcall = NULL;
 
-	fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
-	dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
-	if (!fid) {
-		result = -ENOMEM;
-		goto CleanUpFid;
-	}
+	if (!(perm&V9FS_DMDIR)) {
+		fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
+		dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
+		if (!fid) {
+			result = -ENOMEM;
+			goto CleanUpFid;
+		}
 
-	fid->qid = qid;
-	fid->iounit = iounit;
+		fid->qid = qid;
+		fid->iounit = iounit;
+	} else {
+		err = v9fs_t_clunk(v9ses, newfid);
+		newfid = -1;
+		if (err < 0)
+			dprintk(DEBUG_ERROR, "clunk for mkdir failed: %d\n", err);
+	}
 
 	/* walk to the newly created file and put the fid in the dentry */
 	wfidno = v9fs_get_idpool(&v9ses->fidpool);
-	if (newfid < 0) {
+	if (wfidno < 0) {
 		eprintk(KERN_WARNING, "no free fids available\n");
 		return -ENOSPC;
 	}
 
 	result = v9fs_t_walk(v9ses, dirfidnum, wfidno,
-		(char *) file_dentry->d_name.name, NULL);
+		(char *) file_dentry->d_name.name, &fcall);
 	if (result < 0) {
-		dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
+		PRINT_FCALL_ERROR("clone error", fcall);
 		v9fs_put_idpool(wfidno, &v9ses->fidpool);
 		wfidno = -1;
 		goto CleanUpFid;
 	}
+	kfree(fcall);
+	fcall = NULL;
 
 	if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) {
-		if (!v9fs_t_clunk(v9ses, newfid, &fcall)) {
-			v9fs_put_idpool(wfidno, &v9ses->fidpool);
-		}
+		v9fs_put_idpool(wfidno, &v9ses->fidpool);
 
 		goto CleanUpFid;
 	}
@@ -409,62 +347,43 @@ v9fs_create(struct inode *dir,
 	    (perm & V9FS_DMDEVICE))
 		return 0;
 
-	result = v9fs_t_stat(v9ses, newfid, &fcall);
+	result = v9fs_t_stat(v9ses, wfidno, &fcall);
 	if (result < 0) {
-		dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall),
-			result);
+		PRINT_FCALL_ERROR("stat error", fcall);
 		goto CleanUpFid;
 	}
 
-	v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
 
-	file_inode = v9fs_get_inode(sb, newstat.st_mode);
+	file_inode = v9fs_get_inode(sb,
+		p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode));
+
 	if ((!file_inode) || IS_ERR(file_inode)) {
 		dprintk(DEBUG_ERROR, "create inode failed\n");
 		result = -EBADF;
 		goto CleanUpFid;
 	}
 
-	v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb);
+	v9fs_stat2inode(&fcall->params.rstat.stat, file_inode, sb);
 	kfree(fcall);
 	fcall = NULL;
 	file_dentry->d_op = &v9fs_dentry_operations;
 	d_instantiate(file_dentry, file_inode);
 
-	if (perm & V9FS_DMDIR) {
-		if (!v9fs_t_clunk(v9ses, newfid, &fcall))
-			v9fs_put_idpool(newfid, &v9ses->fidpool);
-		else
-			dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
-				FCALL_ERROR(fcall));
-		kfree(fcall);
-		fid->fidopen = 0;
-		fid->fidcreate = 0;
-		d_drop(file_dentry);
-	}
-
 	return 0;
 
       CleanUpFid:
 	kfree(fcall);
+	fcall = NULL;
 
 	if (newfid >= 0) {
-		if (!v9fs_t_clunk(v9ses, newfid, &fcall))
-			v9fs_put_idpool(newfid, &v9ses->fidpool);
-		else
-			dprintk(DEBUG_ERROR, "clunk failed: %s\n",
-				FCALL_ERROR(fcall));
-
-		kfree(fcall);
+ 		err = v9fs_t_clunk(v9ses, newfid);
+ 		if (err < 0)
+ 			dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
 	}
 	if (wfidno >= 0) {
-		if (!v9fs_t_clunk(v9ses, wfidno, &fcall))
-			v9fs_put_idpool(wfidno, &v9ses->fidpool);
-		else
-			dprintk(DEBUG_ERROR, "clunk failed: %s\n",
-				FCALL_ERROR(fcall));
-
-		kfree(fcall);
+ 		err = v9fs_t_clunk(v9ses, wfidno);
+ 		if (err < 0)
+ 			dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
 	}
 	return result;
 }
@@ -509,10 +428,9 @@ static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
 	}
 
 	result = v9fs_t_remove(v9ses, fid, &fcall);
-	if (result < 0)
-		dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n",
-			FCALL_ERROR(fcall), result);
-	else {
+	if (result < 0) {
+		PRINT_FCALL_ERROR("remove fails", fcall);
+	} else {
 		v9fs_put_idpool(fid, &v9ses->fidpool);
 		v9fs_fid_destroy(v9fid);
 	}
@@ -567,7 +485,6 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 	struct v9fs_fid *fid;
 	struct inode *inode;
 	struct v9fs_fcall *fcall = NULL;
-	struct stat newstat;
 	int dirfidnum = -1;
 	int newfid = -1;
 	int result = 0;
@@ -620,8 +537,8 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 		goto FreeFcall;
 	}
 
-	v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
-	inode = v9fs_get_inode(sb, newstat.st_mode);
+	inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
+		fcall->params.rstat.stat.mode));
 
 	if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
 		eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
@@ -631,7 +548,7 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 		goto FreeFcall;
 	}
 
-	inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid);
+	inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
 
 	fid = v9fs_fid_create(dentry, v9ses, newfid, 0);
 	if (fid == NULL) {
@@ -640,10 +557,10 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 		goto FreeFcall;
 	}
 
-	fid->qid = fcall->params.rstat.stat->qid;
+	fid->qid = fcall->params.rstat.stat.qid;
 
 	dentry->d_op = &v9fs_dentry_operations;
-	v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb);
+	v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
 
 	d_add(dentry, inode);
 	kfree(fcall);
@@ -699,7 +616,7 @@ v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	    v9fs_fid_lookup(old_dentry->d_parent);
 	struct v9fs_fid *newdirfid =
 	    v9fs_fid_lookup(new_dentry->d_parent);
-	struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+	struct v9fs_wstat wstat;
 	struct v9fs_fcall *fcall = NULL;
 	int fid = -1;
 	int olddirfidnum = -1;
@@ -708,9 +625,6 @@ v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 
 	dprintk(DEBUG_VFS, "\n");
 
-	if (!mistat)
-		return -ENOMEM;
-
 	if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
 		dprintk(DEBUG_ERROR, "problem with arguments\n");
 		return -EBADF;
@@ -734,26 +648,15 @@ v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		goto FreeFcallnBail;
 	}
 
-	v9fs_blank_mistat(v9ses, mistat);
+	v9fs_blank_wstat(&wstat);
+	wstat.muid = v9ses->name;
+	wstat.name = (char *) new_dentry->d_name.name;
 
-	strcpy(mistat->data + 1, v9ses->name);
-	mistat->name = mistat->data + 1 + strlen(v9ses->name);
-
-	if (new_dentry->d_name.len >
-	    (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) {
-		dprintk(DEBUG_ERROR, "new name too long\n");
-		goto FreeFcallnBail;
-	}
-
-	strcpy(mistat->name, new_dentry->d_name.name);
-	retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
+	retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
 
       FreeFcallnBail:
-	kfree(mistat);
-
 	if (retval < 0)
-		dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
-			FCALL_ERROR(fcall));
+		PRINT_FCALL_ERROR("wstat error", fcall);
 
 	kfree(fcall);
 	return retval;
@@ -788,7 +691,7 @@ v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 	if (err < 0)
 		dprintk(DEBUG_ERROR, "stat error\n");
 	else {
-		v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode,
+		v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
 				  dentry->d_inode->i_sb);
 		generic_fillattr(dentry->d_inode, stat);
 	}
@@ -809,57 +712,44 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
 	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
 	struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
 	struct v9fs_fcall *fcall = NULL;
-	struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+	struct v9fs_wstat wstat;
 	int res = -EPERM;
 
 	dprintk(DEBUG_VFS, "\n");
 
-	if (!mistat)
-		return -ENOMEM;
-
 	if (!fid) {
 		dprintk(DEBUG_ERROR,
 			"Couldn't find fid associated with dentry\n");
 		return -EBADF;
 	}
 
-	v9fs_blank_mistat(v9ses, mistat);
+	v9fs_blank_wstat(&wstat);
 	if (iattr->ia_valid & ATTR_MODE)
-		mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
+		wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
 
 	if (iattr->ia_valid & ATTR_MTIME)
-		mistat->mtime = iattr->ia_mtime.tv_sec;
+		wstat.mtime = iattr->ia_mtime.tv_sec;
 
 	if (iattr->ia_valid & ATTR_ATIME)
-		mistat->atime = iattr->ia_atime.tv_sec;
+		wstat.atime = iattr->ia_atime.tv_sec;
 
 	if (iattr->ia_valid & ATTR_SIZE)
-		mistat->length = iattr->ia_size;
+		wstat.length = iattr->ia_size;
 
 	if (v9ses->extended) {
-		char *ptr = mistat->data+1;
-
-		if (iattr->ia_valid & ATTR_UID) {
-			mistat->uid = ptr;
-			ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid);
-			mistat->n_uid = iattr->ia_uid;
-		}
+		if (iattr->ia_valid & ATTR_UID)
+			wstat.n_uid = iattr->ia_uid;
 
-		if (iattr->ia_valid & ATTR_GID) {
-			mistat->gid = ptr;
-			ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid);
-			mistat->n_gid = iattr->ia_gid;
-		}
+		if (iattr->ia_valid & ATTR_GID)
+			wstat.n_gid = iattr->ia_gid;
 	}
 
-	res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
+	res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
 
 	if (res < 0)
-		dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall));
+		PRINT_FCALL_ERROR("wstat error", fcall);
 
-	kfree(mistat);
 	kfree(fcall);
-
 	if (res >= 0)
 		res = inode_setattr(dentry->d_inode, iattr);
 
@@ -867,51 +757,47 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
 }
 
 /**
- * v9fs_mistat2inode - populate an inode structure with mistat info
- * @mistat: Plan 9 metadata (mistat) structure
+ * v9fs_stat2inode - populate an inode structure with mistat info
+ * @stat: Plan 9 metadata (mistat) structure
  * @inode: inode to populate
  * @sb: superblock of filesystem
  *
  */
 
 void
-v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
-		  struct super_block *sb)
+v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode,
+	struct super_block *sb)
 {
+	int n;
+	char ext[32];
 	struct v9fs_session_info *v9ses = sb->s_fs_info;
 
 	inode->i_nlink = 1;
 
-	inode->i_atime.tv_sec = mistat->atime;
-	inode->i_mtime.tv_sec = mistat->mtime;
-	inode->i_ctime.tv_sec = mistat->mtime;
+	inode->i_atime.tv_sec = stat->atime;
+	inode->i_mtime.tv_sec = stat->mtime;
+	inode->i_ctime.tv_sec = stat->mtime;
 
-	inode->i_uid = -1;
-	inode->i_gid = -1;
+	inode->i_uid = v9ses->uid;
+	inode->i_gid = v9ses->gid;
 
 	if (v9ses->extended) {
-		/* TODO: string to uid mapping via user-space daemon */
-		inode->i_uid = mistat->n_uid;
-		inode->i_gid = mistat->n_gid;
-
-		if (mistat->n_uid == -1)
-			sscanf(mistat->uid, "%x", &inode->i_uid);
-
-		if (mistat->n_gid == -1)
-			sscanf(mistat->gid, "%x", &inode->i_gid);
+		inode->i_uid = stat->n_uid;
+		inode->i_gid = stat->n_gid;
 	}
 
-	if (inode->i_uid == -1)
-		inode->i_uid = v9ses->uid;
-	if (inode->i_gid == -1)
-		inode->i_gid = v9ses->gid;
-
-	inode->i_mode = p9mode2unixmode(v9ses, mistat->mode);
+	inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
 	if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
 		char type = 0;
 		int major = -1;
 		int minor = -1;
-		sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
+
+		n = stat->extension.len;
+		if (n > sizeof(ext)-1)
+			n = sizeof(ext)-1;
+		memmove(ext, stat->extension.str, n);
+		ext[n] = 0;
+		sscanf(ext, "%c %u %u", &type, &major, &minor);
 		switch (type) {
 		case 'c':
 			inode->i_mode &= ~S_IFBLK;
@@ -920,14 +806,14 @@ v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
 		case 'b':
 			break;
 		default:
-			dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
-				type, mistat->extension);
+			dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
+				type, stat->extension.len, stat->extension.str);
 		};
 		inode->i_rdev = MKDEV(major, minor);
 	} else
 		inode->i_rdev = 0;
 
-	inode->i_size = mistat->length;
+	inode->i_size = stat->length;
 
 	inode->i_blksize = sb->s_blocksize;
 	inode->i_blocks =
@@ -955,71 +841,6 @@ ino_t v9fs_qid2ino(struct v9fs_qid *qid)
 }
 
 /**
- * v9fs_vfs_symlink - helper function to create symlinks
- * @dir: directory inode containing symlink
- * @dentry: dentry for symlink
- * @symname: symlink data
- *
- * See 9P2000.u RFC for more information
- *
- */
-
-static int
-v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
-{
-	int retval = -EPERM;
-	struct v9fs_fid *newfid;
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
-	struct v9fs_fcall *fcall = NULL;
-	struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
-
-	dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
-		symname);
-
-	if (!mistat)
-		return -ENOMEM;
-
-	if (!v9ses->extended) {
-		dprintk(DEBUG_ERROR, "not extended\n");
-		goto FreeFcall;
-	}
-
-	/* issue a create */
-	retval = v9fs_create(dir, dentry, S_IFLNK, 0);
-	if (retval != 0)
-		goto FreeFcall;
-
-	newfid = v9fs_fid_lookup(dentry);
-
-	/* issue a twstat */
-	v9fs_blank_mistat(v9ses, mistat);
-	strcpy(mistat->data + 1, symname);
-	mistat->extension = mistat->data + 1;
-	retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
-	if (retval < 0) {
-		dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
-			FCALL_ERROR(fcall));
-		goto FreeFcall;
-	}
-
-	kfree(fcall);
-
-	if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
-		dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
-			FCALL_ERROR(fcall));
-		goto FreeFcall;
-	}
-
-	d_drop(dentry);		/* FID - will this also clunk? */
-
-      FreeFcall:
-	kfree(mistat);
-	kfree(fcall);
-
-	return retval;
-}
-
-/**
  * v9fs_readlink - read a symlink's location (internal version)
  * @dentry: dentry for symlink
  * @buffer: buffer to load symlink location into
@@ -1058,16 +879,17 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
 	if (!fcall)
 		return -EIO;
 
-	if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
+	if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
 		retval = -EINVAL;
 		goto FreeFcall;
 	}
 
 	/* copy extension buffer into buffer */
-	if (strlen(fcall->params.rstat.stat->extension) < buflen)
-		buflen = strlen(fcall->params.rstat.stat->extension);
+	if (fcall->params.rstat.stat.extension.len < buflen)
+		buflen = fcall->params.rstat.stat.extension.len;
 
-	memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1);
+	memcpy(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
+	buffer[buflen-1] = 0;
 
 	retval = buflen;
 
@@ -1157,6 +979,77 @@ static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void
 		__putname(s);
 }
 
+static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
+	int mode, const char *extension)
+{
+	int err, retval;
+	struct v9fs_session_info *v9ses;
+	struct v9fs_fcall *fcall;
+	struct v9fs_fid *fid;
+	struct v9fs_wstat wstat;
+
+	v9ses = v9fs_inode2v9ses(dir);
+	retval = -EPERM;
+	fcall = NULL;
+
+	if (!v9ses->extended) {
+		dprintk(DEBUG_ERROR, "not extended\n");
+		goto free_mem;
+	}
+
+	/* issue a create */
+	retval = v9fs_create(dir, dentry, mode, 0);
+	if (retval != 0)
+		goto free_mem;
+
+	fid = v9fs_fid_get_created(dentry);
+	if (!fid) {
+		dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
+		goto free_mem;
+	}
+
+	/* issue a Twstat */
+	v9fs_blank_wstat(&wstat);
+	wstat.muid = v9ses->name;
+	wstat.extension = (char *) extension;
+	retval = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
+	if (retval < 0) {
+		PRINT_FCALL_ERROR("wstat error", fcall);
+		goto free_mem;
+	}
+
+	err = v9fs_t_clunk(v9ses, fid->fid);
+	if (err < 0) {
+		dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
+		goto free_mem;
+	}
+
+	d_drop(dentry);		/* FID - will this also clunk? */
+
+free_mem:
+	kfree(fcall);
+	return retval;
+}
+
+/**
+ * v9fs_vfs_symlink - helper function to create symlinks
+ * @dir: directory inode containing symlink
+ * @dentry: dentry for symlink
+ * @symname: symlink data
+ *
+ * See 9P2000.u RFC for more information
+ *
+ */
+
+static int
+v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+{
+	dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
+		symname);
+
+	return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
+}
+
 /**
  * v9fs_vfs_link - create a hardlink
  * @old_dentry: dentry for file to link to
@@ -1173,64 +1066,24 @@ static int
 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
 	      struct dentry *dentry)
 {
-	int retval = -EPERM;
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
-	struct v9fs_fcall *fcall = NULL;
-	struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
-	struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
-	struct v9fs_fid *newfid = NULL;
-	char *symname = __getname();
+	int retval;
+	struct v9fs_fid *oldfid;
+	char *name;
 
 	dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
 		old_dentry->d_name.name);
 
-	if (!v9ses->extended) {
-		dprintk(DEBUG_ERROR, "not extended\n");
-		goto FreeMem;
-	}
-
-	/* get fid of old_dentry */
-	sprintf(symname, "hardlink(%d)\n", oldfid->fid);
-
-	/* issue a create */
-	retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0);
-	if (retval != 0)
-		goto FreeMem;
-
-	newfid = v9fs_fid_lookup(dentry);
-	if (!newfid) {
-		dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
-		goto FreeMem;
-	}
-
-	/* issue a twstat */
-	v9fs_blank_mistat(v9ses, mistat);
-	strcpy(mistat->data + 1, symname);
-	mistat->extension = mistat->data + 1;
-	retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
-	if (retval < 0) {
-		dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
-			FCALL_ERROR(fcall));
-		goto FreeMem;
-	}
-
-	kfree(fcall);
-
-	if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
-		dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
-			FCALL_ERROR(fcall));
-		goto FreeMem;
+	oldfid = v9fs_fid_lookup(old_dentry);
+	if (!oldfid) {
+		dprintk(DEBUG_ERROR, "can't find oldfid\n");
+		return -EPERM;
 	}
 
-	d_drop(dentry);		/* FID - will this also clunk? */
-
-	kfree(fcall);
-	fcall = NULL;
+	name = __getname();
+	sprintf(name, "hardlink(%d)\n", oldfid->fid);
+	retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
+	__putname(name);
 
-      FreeMem:
-	kfree(mistat);
-	kfree(fcall);
-	__putname(symname);
 	return retval;
 }
 
@@ -1246,82 +1099,30 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
 static int
 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 {
-	int retval = -EPERM;
-	struct v9fs_fid *newfid;
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
-	struct v9fs_fcall *fcall = NULL;
-	struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
-	char *symname = __getname();
+	int retval;
+	char *name;
 
 	dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
 		dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
 
-	if (!mistat)
-		return -ENOMEM;
-
-	if (!new_valid_dev(rdev)) {
-		retval = -EINVAL;
-		goto FreeMem;
-	}
-
-	if (!v9ses->extended) {
-		dprintk(DEBUG_ERROR, "not extended\n");
-		goto FreeMem;
-	}
-
-	/* issue a create */
-	retval = v9fs_create(dir, dentry, mode, 0);
-
-	if (retval != 0)
-		goto FreeMem;
-
-	newfid = v9fs_fid_lookup(dentry);
-	if (!newfid) {
-		dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
-		retval = -EINVAL;
-		goto FreeMem;
-	}
+	if (!new_valid_dev(rdev))
+		return -EINVAL;
 
+	name = __getname();
 	/* build extension */
 	if (S_ISBLK(mode))
-		sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
+		sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
 	else if (S_ISCHR(mode))
-		sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
+		sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
 	else if (S_ISFIFO(mode))
-		;	/* DO NOTHING */
+		*name = 0;
 	else {
-		retval = -EINVAL;
-		goto FreeMem;
-	}
-
-	if (!S_ISFIFO(mode)) {
-		/* issue a twstat */
-		v9fs_blank_mistat(v9ses, mistat);
-		strcpy(mistat->data + 1, symname);
-		mistat->extension = mistat->data + 1;
-		retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
-		if (retval < 0) {
-			dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
-				FCALL_ERROR(fcall));
-			goto FreeMem;
-		}
+		__putname(name);
+		return -EINVAL;
 	}
 
-	/* need to update dcache so we show up */
-	kfree(fcall);
-
-	if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
-		dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
-			FCALL_ERROR(fcall));
-		goto FreeMem;
-	}
-
-	d_drop(dentry);		/* FID - will this also clunk? */
-
-      FreeMem:
-	kfree(mistat);
-	kfree(fcall);
-	__putname(symname);
+	retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
+	__putname(name);
 
 	return retval;
 }
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 82c5b00840796d..ae0f06b3c11a04 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -44,7 +44,6 @@
 #include "v9fs.h"
 #include "9p.h"
 #include "v9fs_vfs.h"
-#include "conv.h"
 #include "fid.h"
 
 static void v9fs_clear_inode(struct inode *);
@@ -123,12 +122,13 @@ static struct super_block *v9fs_get_sb(struct file_system_type
 
 	dprintk(DEBUG_VFS, " \n");
 
-	v9ses = kcalloc(1, sizeof(struct v9fs_session_info), GFP_KERNEL);
+	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
 	if (!v9ses)
 		return ERR_PTR(-ENOMEM);
 
 	if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
 		dprintk(DEBUG_ERROR, "problem initiating session\n");
+		kfree(v9ses);
 		return ERR_PTR(newfid);
 	}
 
@@ -157,7 +157,7 @@ static struct super_block *v9fs_get_sb(struct file_system_type
 	stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
 	if (stat_result < 0) {
 		dprintk(DEBUG_ERROR, "stat error\n");
-		v9fs_t_clunk(v9ses, newfid, NULL);
+		v9fs_t_clunk(v9ses, newfid);
 		v9fs_put_idpool(newfid, &v9ses->fidpool);
 	} else {
 		/* Setup the Root Inode */
@@ -167,10 +167,10 @@ static struct super_block *v9fs_get_sb(struct file_system_type
 			goto put_back_sb;
 		}
 
-		root_fid->qid = fcall->params.rstat.stat->qid;
+		root_fid->qid = fcall->params.rstat.stat.qid;
 		root->d_inode->i_ino =
-		    v9fs_qid2ino(&fcall->params.rstat.stat->qid);
-		v9fs_mistat2inode(fcall->params.rstat.stat, root->d_inode, sb);
+		    v9fs_qid2ino(&fcall->params.rstat.stat.qid);
+		v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb);
 	}
 
 	kfree(fcall);
diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 175b2e8177c136..f3d3d81eb7e985 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -1,6 +1,6 @@
 config BINFMT_ELF
 	bool "Kernel support for ELF binaries"
-	depends on MMU
+	depends on MMU && (BROKEN || !FRV)
 	default y
 	---help---
 	  ELF (Executable and Linkable Format) is a format for libraries and
diff --git a/fs/Makefile b/fs/Makefile
index 73676111ebbe76..35e9aec608e494 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -10,7 +10,7 @@ obj-y :=	open.o read_write.o file_table.o buffer.o  bio.o super.o \
 		ioctl.o readdir.o select.o fifo.o locks.o dcache.o inode.o \
 		attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \
 		seq_file.o xattr.o libfs.o fs-writeback.o mpage.o direct-io.o \
-		ioprio.o pnode.o
+		ioprio.o pnode.o drop_caches.o
 
 obj-$(CONFIG_INOTIFY)		+= inotify.o
 obj-$(CONFIG_EPOLL)		+= eventpoll.o
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 6682d6d7f29408..5c61c24dab2a12 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -137,7 +137,7 @@ static inline void afs_dir_check_page(struct inode *dir, struct page *page)
 #endif
 
 	/* determine how many magic numbers there should be in this page */
-	latter = dir->i_size - (page->index << PAGE_CACHE_SHIFT);
+	latter = dir->i_size - page_offset(page);
 	if (latter >= PAGE_SIZE)
 		qty = PAGE_SIZE;
 	else
diff --git a/fs/afs/volume.h b/fs/afs/volume.h
index 1e691889c4c969..bfdcf19ba3f387 100644
--- a/fs/afs/volume.h
+++ b/fs/afs/volume.h
@@ -18,8 +18,6 @@
 #include "kafsasyncd.h"
 #include "cache.h"
 
-#define __packed __attribute__((packed))
-
 typedef enum {
 	AFS_VLUPD_SLEEP,		/* sleeping waiting for update timer to fire */
 	AFS_VLUPD_PENDING,		/* on pending queue */
@@ -115,7 +113,7 @@ struct afs_volume
 	struct cachefs_cookie	*cache;		/* caching cookie */
 #endif
 	afs_volid_t		vid;		/* volume ID */
-	afs_voltype_t __packed	type;		/* type of volume */
+	afs_voltype_t		type;		/* type of volume */
 	char			type_force;	/* force volume type (suppress R/O -> R/W) */
 	unsigned short		nservers;	/* number of server slots filled */
 	unsigned short		rjservers;	/* number of servers discarded due to -ENOMEDIUM */
diff --git a/fs/aio.c b/fs/aio.c
index 5a28b69ad223b2..aec2b1916d1b27 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -29,7 +29,6 @@
 #include <linux/highmem.h>
 #include <linux/workqueue.h>
 #include <linux/security.h>
-#include <linux/rcuref.h>
 
 #include <asm/kmap_types.h>
 #include <asm/uaccess.h>
@@ -514,7 +513,7 @@ static int __aio_put_req(struct kioctx *ctx, struct kiocb *req)
 	/* Must be done under the lock to serialise against cancellation.
 	 * Call this aio_fput as it duplicates fput via the fput_work.
 	 */
-	if (unlikely(rcuref_dec_and_test(&req->ki_filp->f_count))) {
+	if (unlikely(atomic_dec_and_test(&req->ki_filp->f_count))) {
 		get_ioctx(ctx);
 		spin_lock(&fput_lock);
 		list_add(&req->ki_list, &fput_head);
diff --git a/fs/attr.c b/fs/attr.c
index 67bcd9b14ea580..b34732506f1dcf 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -67,20 +67,12 @@ EXPORT_SYMBOL(inode_change_ok);
 int inode_setattr(struct inode * inode, struct iattr * attr)
 {
 	unsigned int ia_valid = attr->ia_valid;
-	int error = 0;
-
-	if (ia_valid & ATTR_SIZE) {
-		if (attr->ia_size != i_size_read(inode)) {
-			error = vmtruncate(inode, attr->ia_size);
-			if (error || (ia_valid == ATTR_SIZE))
-				goto out;
-		} else {
-			/*
-			 * We skipped the truncate but must still update
-			 * timestamps
-			 */
-			ia_valid |= ATTR_MTIME|ATTR_CTIME;
-		}
+
+	if (ia_valid & ATTR_SIZE &&
+	    attr->ia_size != i_size_read(inode)) {
+		int error = vmtruncate(inode, attr->ia_size);
+		if (error)
+			return error;
 	}
 
 	if (ia_valid & ATTR_UID)
@@ -104,8 +96,8 @@ int inode_setattr(struct inode * inode, struct iattr * attr)
 		inode->i_mode = mode;
 	}
 	mark_inode_dirty(inode);
-out:
-	return error;
+
+	return 0;
 }
 EXPORT_SYMBOL(inode_setattr);
 
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index fca83e28edcf67..385bed09b0d840 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -209,7 +209,7 @@ static inline int simple_empty_nolock(struct dentry *dentry)
 	struct dentry *child;
 	int ret = 0;
 
-	list_for_each_entry(child, &dentry->d_subdirs, d_child)
+	list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child)
 		if (simple_positive(child))
 			goto out;
 	ret = 1;
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index feb6ac427d058b..dc39589df165a0 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -105,7 +105,7 @@ repeat:
 	next = this_parent->d_subdirs.next;
 resume:
 	while (next != &this_parent->d_subdirs) {
-		struct dentry *dentry = list_entry(next, struct dentry, d_child);
+		struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
 
 		/* Negative dentry - give up */
 		if (!simple_positive(dentry)) {
@@ -138,7 +138,7 @@ resume:
 	}
 
 	if (this_parent != top) {
-		next = this_parent->d_child.next;
+		next = this_parent->d_u.d_child.next;
 		this_parent = this_parent->d_parent;
 		goto resume;
 	}
@@ -163,7 +163,7 @@ repeat:
 	next = this_parent->d_subdirs.next;
 resume:
 	while (next != &this_parent->d_subdirs) {
-		struct dentry *dentry = list_entry(next, struct dentry, d_child);
+		struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
 
 		/* Negative dentry - give up */
 		if (!simple_positive(dentry)) {
@@ -199,7 +199,7 @@ cont:
 	}
 
 	if (this_parent != parent) {
-		next = this_parent->d_child.next;
+		next = this_parent->d_u.d_child.next;
 		this_parent = this_parent->d_parent;
 		goto resume;
 	}
@@ -238,7 +238,7 @@ static struct dentry *autofs4_expire(struct super_block *sb,
 	/* On exit from the loop expire is set to a dgot dentry
 	 * to expire or it's NULL */
 	while ( next != &root->d_subdirs ) {
-		struct dentry *dentry = list_entry(next, struct dentry, d_child);
+		struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
 
 		/* Negative dentry - give up */
 		if ( !simple_positive(dentry) ) {
@@ -302,7 +302,7 @@ next:
 			expired, (int)expired->d_name.len, expired->d_name.name);
 		spin_lock(&dcache_lock);
 		list_del(&expired->d_parent->d_subdirs);
-		list_add(&expired->d_parent->d_subdirs, &expired->d_child);
+		list_add(&expired->d_parent->d_subdirs, &expired->d_u.d_child);
 		spin_unlock(&dcache_lock);
 		return expired;
 	}
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 818b37be5153f3..2d3082854a292d 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -91,7 +91,7 @@ repeat:
 	next = this_parent->d_subdirs.next;
 resume:
 	while (next != &this_parent->d_subdirs) {
-		struct dentry *dentry = list_entry(next, struct dentry, d_child);
+		struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
 
 		/* Negative dentry - don`t care */
 		if (!simple_positive(dentry)) {
@@ -117,7 +117,7 @@ resume:
 	if (this_parent != sbi->root) {
 		struct dentry *dentry = this_parent;
 
-		next = this_parent->d_child.next;
+		next = this_parent->d_u.d_child.next;
 		this_parent = this_parent->d_parent;
 		spin_unlock(&dcache_lock);
 		DPRINTK("parent dentry %p %.*s",
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 2a771ec66956f9..2241405ffc413a 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -143,7 +143,8 @@ static int autofs4_dcache_readdir(struct file * filp, void * dirent, filldir_t f
 			}
 
 			while(1) {
-				struct dentry *de = list_entry(list, struct dentry, d_child);
+				struct dentry *de = list_entry(list,
+						struct dentry, d_u.d_child);
 
 				if (!d_unhashed(de) && de->d_inode) {
 					spin_unlock(&dcache_lock);
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index f36f2210204f52..80ca932ba0bdda 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -58,7 +58,7 @@ extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
  * If we don't support core dumping, then supply a NULL so we
  * don't even try.
  */
-#ifdef USE_ELF_CORE_DUMP
+#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
 static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file);
 #else
 #define elf_core_dump	NULL
@@ -288,11 +288,17 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
 			struct elf_phdr *eppnt, int prot, int type)
 {
 	unsigned long map_addr;
+	unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr);
 
 	down_write(&current->mm->mmap_sem);
-	map_addr = do_mmap(filep, ELF_PAGESTART(addr),
-			   eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot, type,
-			   eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));
+	/* mmap() will return -EINVAL if given a zero size, but a
+	 * segment with zero filesize is perfectly valid */
+	if (eppnt->p_filesz + pageoffset)
+		map_addr = do_mmap(filep, ELF_PAGESTART(addr),
+				   eppnt->p_filesz + pageoffset, prot, type,
+				   eppnt->p_offset - pageoffset);
+	else
+		map_addr = ELF_PAGESTART(addr);
 	up_write(&current->mm->mmap_sem);
 	return(map_addr);
 }
@@ -1107,7 +1113,7 @@ out:
  * Note that some platforms still use traditional core dumps and not
  * the ELF core dump.  Each platform can select it as appropriate.
  */
-#ifdef USE_ELF_CORE_DUMP
+#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
 
 /*
  * ELF core dumper
diff --git a/fs/buffer.c b/fs/buffer.c
index 5287be18633bc7..55f0975a9b15dc 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -153,14 +153,8 @@ int sync_blockdev(struct block_device *bdev)
 {
 	int ret = 0;
 
-	if (bdev) {
-		int err;
-
-		ret = filemap_fdatawrite(bdev->bd_inode->i_mapping);
-		err = filemap_fdatawait(bdev->bd_inode->i_mapping);
-		if (!ret)
-			ret = err;
-	}
+	if (bdev)
+		ret = filemap_write_and_wait(bdev->bd_inode->i_mapping);
 	return ret;
 }
 EXPORT_SYMBOL(sync_blockdev);
@@ -1768,7 +1762,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
 	 * handle that here by just cleaning them.
 	 */
 
-	block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+	block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
 	head = page_buffers(page);
 	bh = head;
 
@@ -2160,11 +2154,12 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
  * truncates.  Uses prepare/commit_write to allow the filesystem to
  * deal with the hole.  
  */
-int generic_cont_expand(struct inode *inode, loff_t size)
+static int __generic_cont_expand(struct inode *inode, loff_t size,
+				 pgoff_t index, unsigned int offset)
 {
 	struct address_space *mapping = inode->i_mapping;
 	struct page *page;
-	unsigned long index, offset, limit;
+	unsigned long limit;
 	int err;
 
 	err = -EFBIG;
@@ -2176,24 +2171,24 @@ int generic_cont_expand(struct inode *inode, loff_t size)
 	if (size > inode->i_sb->s_maxbytes)
 		goto out;
 
-	offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
-
-	/* ugh.  in prepare/commit_write, if from==to==start of block, we 
-	** skip the prepare.  make sure we never send an offset for the start
-	** of a block
-	*/
-	if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
-		offset++;
-	}
-	index = size >> PAGE_CACHE_SHIFT;
 	err = -ENOMEM;
 	page = grab_cache_page(mapping, index);
 	if (!page)
 		goto out;
 	err = mapping->a_ops->prepare_write(NULL, page, offset, offset);
-	if (!err) {
-		err = mapping->a_ops->commit_write(NULL, page, offset, offset);
+	if (err) {
+		/*
+		 * ->prepare_write() may have instantiated a few blocks
+		 * outside i_size.  Trim these off again.
+		 */
+		unlock_page(page);
+		page_cache_release(page);
+		vmtruncate(inode, inode->i_size);
+		goto out;
 	}
+
+	err = mapping->a_ops->commit_write(NULL, page, offset, offset);
+
 	unlock_page(page);
 	page_cache_release(page);
 	if (err > 0)
@@ -2202,6 +2197,36 @@ out:
 	return err;
 }
 
+int generic_cont_expand(struct inode *inode, loff_t size)
+{
+	pgoff_t index;
+	unsigned int offset;
+
+	offset = (size & (PAGE_CACHE_SIZE - 1)); /* Within page */
+
+	/* ugh.  in prepare/commit_write, if from==to==start of block, we
+	** skip the prepare.  make sure we never send an offset for the start
+	** of a block
+	*/
+	if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
+		/* caller must handle this extra byte. */
+		offset++;
+	}
+	index = size >> PAGE_CACHE_SHIFT;
+
+	return __generic_cont_expand(inode, size, index, offset);
+}
+
+int generic_cont_expand_simple(struct inode *inode, loff_t size)
+{
+	loff_t pos = size - 1;
+	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+	unsigned int offset = (pos & (PAGE_CACHE_SIZE - 1)) + 1;
+
+	/* prepare/commit_write can handle even if from==to==start of block. */
+	return __generic_cont_expand(inode, size, index, offset);
+}
+
 /*
  * For moronic filesystems that do not allow holes in file.
  * We may have to extend the file.
@@ -2610,7 +2635,7 @@ int block_truncate_page(struct address_space *mapping,
 	pgoff_t index = from >> PAGE_CACHE_SHIFT;
 	unsigned offset = from & (PAGE_CACHE_SIZE-1);
 	unsigned blocksize;
-	pgoff_t iblock;
+	sector_t iblock;
 	unsigned length, pos;
 	struct inode *inode = mapping->host;
 	struct page *page;
@@ -2626,7 +2651,7 @@ int block_truncate_page(struct address_space *mapping,
 		return 0;
 
 	length = blocksize - length;
-	iblock = index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+	iblock = (sector_t)index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
 	
 	page = grab_cache_page(mapping, index);
 	err = -ENOMEM;
@@ -3145,6 +3170,7 @@ EXPORT_SYMBOL(fsync_bdev);
 EXPORT_SYMBOL(generic_block_bmap);
 EXPORT_SYMBOL(generic_commit_write);
 EXPORT_SYMBOL(generic_cont_expand);
+EXPORT_SYMBOL(generic_cont_expand_simple);
 EXPORT_SYMBOL(init_buffer);
 EXPORT_SYMBOL(invalidate_bdev);
 EXPORT_SYMBOL(ll_rw_block);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 14a1c72ced92e1..5ade53d7bca896 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -127,8 +127,7 @@ static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
 		if (file->f_dentry->d_inode->i_mapping) {
 		/* BB no need to lock inode until after invalidate
 		   since namei code should already have it locked? */
-			filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
-			filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
+			filemap_write_and_wait(file->f_dentry->d_inode->i_mapping);
 		}
 		cFYI(1, ("invalidating remote inode since open detected it "
 			 "changed"));
@@ -419,8 +418,7 @@ static int cifs_reopen_file(struct inode *inode, struct file *file,
 		pCifsInode = CIFS_I(inode);
 		if (pCifsInode) {
 			if (can_flush) {
-				filemap_fdatawrite(inode->i_mapping);
-				filemap_fdatawait(inode->i_mapping);
+				filemap_write_and_wait(inode->i_mapping);
 			/* temporarily disable caching while we
 			   go to server to get inode info */
 				pCifsInode->clientCanCacheAll = FALSE;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 411c1f7f84da60..9558f51bca55a1 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1148,8 +1148,7 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
 	/* BB check if we need to refresh inode from server now ? BB */
 
 	/* need to flush data before changing file size on server */
-	filemap_fdatawrite(direntry->d_inode->i_mapping);
-	filemap_fdatawait(direntry->d_inode->i_mapping);
+	filemap_write_and_wait(direntry->d_inode->i_mapping);
 
 	if (attrs->ia_valid & ATTR_SIZE) {
 		/* To avoid spurious oplock breaks from server, in the case of
diff --git a/fs/coda/cache.c b/fs/coda/cache.c
index 80072fd9b7faf6..c607d923350a4e 100644
--- a/fs/coda/cache.c
+++ b/fs/coda/cache.c
@@ -93,7 +93,7 @@ static void coda_flag_children(struct dentry *parent, int flag)
 	spin_lock(&dcache_lock);
 	list_for_each(child, &parent->d_subdirs)
 	{
-		de = list_entry(child, struct dentry, d_child);
+		de = list_entry(child, struct dentry, d_u.d_child);
 		/* don't know what to do with negative dentries */
 		if ( ! de->d_inode ) 
 			continue;
diff --git a/fs/compat.c b/fs/compat.c
index 55ac0324aaf164..271b75d1597f50 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -494,9 +494,21 @@ asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 		ret = sys_fcntl(fd, cmd, (unsigned long)&f);
 		set_fs(old_fs);
 		if (cmd == F_GETLK && ret == 0) {
-			if ((f.l_start >= COMPAT_OFF_T_MAX) ||
-			    ((f.l_start + f.l_len) > COMPAT_OFF_T_MAX))
+			/* GETLK was successfule and we need to return the data...
+			 * but it needs to fit in the compat structure.
+			 * l_start shouldn't be too big, unless the original
+			 * start + end is greater than COMPAT_OFF_T_MAX, in which
+			 * case the app was asking for trouble, so we return
+			 * -EOVERFLOW in that case.
+			 * l_len could be too big, in which case we just truncate it,
+			 * and only allow the app to see that part of the conflicting
+			 * lock that might make sense to it anyway
+			 */
+
+			if (f.l_start > COMPAT_OFF_T_MAX)
 				ret = -EOVERFLOW;
+			if (f.l_len > COMPAT_OFF_T_MAX)
+				f.l_len = COMPAT_OFF_T_MAX;
 			if (ret == 0)
 				ret = put_compat_flock(&f, compat_ptr(arg));
 		}
@@ -515,9 +527,11 @@ asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 				(unsigned long)&f);
 		set_fs(old_fs);
 		if (cmd == F_GETLK64 && ret == 0) {
-			if ((f.l_start >= COMPAT_LOFF_T_MAX) ||
-			    ((f.l_start + f.l_len) > COMPAT_LOFF_T_MAX))
+			/* need to return lock information - see above for commentary */
+			if (f.l_start > COMPAT_LOFF_T_MAX)
 				ret = -EOVERFLOW;
+			if (f.l_len > COMPAT_LOFF_T_MAX)
+				f.l_len = COMPAT_LOFF_T_MAX;
 			if (ret == 0)
 				ret = put_compat_flock64(&f, compat_ptr(arg));
 		}
diff --git a/fs/dcache.c b/fs/dcache.c
index 17e4391386818d..1536f15c4d4c78 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -71,7 +71,7 @@ struct dentry_stat_t dentry_stat = {
 
 static void d_callback(struct rcu_head *head)
 {
-	struct dentry * dentry = container_of(head, struct dentry, d_rcu);
+	struct dentry * dentry = container_of(head, struct dentry, d_u.d_rcu);
 
 	if (dname_external(dentry))
 		kfree(dentry->d_name.name);
@@ -86,7 +86,7 @@ static void d_free(struct dentry *dentry)
 {
 	if (dentry->d_op && dentry->d_op->d_release)
 		dentry->d_op->d_release(dentry);
- 	call_rcu(&dentry->d_rcu, d_callback);
+ 	call_rcu(&dentry->d_u.d_rcu, d_callback);
 }
 
 /*
@@ -193,7 +193,7 @@ kill_it: {
   			list_del(&dentry->d_lru);
   			dentry_stat.nr_unused--;
   		}
-  		list_del(&dentry->d_child);
+  		list_del(&dentry->d_u.d_child);
 		dentry_stat.nr_dentry--;	/* For d_free, below */
 		/*drops the locks, at that point nobody can reach this dentry */
 		dentry_iput(dentry);
@@ -367,7 +367,7 @@ static inline void prune_one_dentry(struct dentry * dentry)
 	struct dentry * parent;
 
 	__d_drop(dentry);
-	list_del(&dentry->d_child);
+	list_del(&dentry->d_u.d_child);
 	dentry_stat.nr_dentry--;	/* For d_free, below */
 	dentry_iput(dentry);
 	parent = dentry->d_parent;
@@ -518,7 +518,7 @@ repeat:
 resume:
 	while (next != &this_parent->d_subdirs) {
 		struct list_head *tmp = next;
-		struct dentry *dentry = list_entry(tmp, struct dentry, d_child);
+		struct dentry *dentry = list_entry(tmp, struct dentry, d_u.d_child);
 		next = tmp->next;
 		/* Have we found a mount point ? */
 		if (d_mountpoint(dentry))
@@ -532,7 +532,7 @@ resume:
 	 * All done at this level ... ascend and resume the search.
 	 */
 	if (this_parent != parent) {
-		next = this_parent->d_child.next; 
+		next = this_parent->d_u.d_child.next;
 		this_parent = this_parent->d_parent;
 		goto resume;
 	}
@@ -569,7 +569,7 @@ repeat:
 resume:
 	while (next != &this_parent->d_subdirs) {
 		struct list_head *tmp = next;
-		struct dentry *dentry = list_entry(tmp, struct dentry, d_child);
+		struct dentry *dentry = list_entry(tmp, struct dentry, d_u.d_child);
 		next = tmp->next;
 
 		if (!list_empty(&dentry->d_lru)) {
@@ -610,7 +610,7 @@ dentry->d_parent->d_name.name, dentry->d_name.name, found);
 	 * All done at this level ... ascend and resume the search.
 	 */
 	if (this_parent != parent) {
-		next = this_parent->d_child.next; 
+		next = this_parent->d_u.d_child.next;
 		this_parent = this_parent->d_parent;
 #ifdef DCACHE_DEBUG
 printk(KERN_DEBUG "select_parent: ascending to %s/%s, found=%d\n",
@@ -753,12 +753,12 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name)
 		dentry->d_parent = dget(parent);
 		dentry->d_sb = parent->d_sb;
 	} else {
-		INIT_LIST_HEAD(&dentry->d_child);
+		INIT_LIST_HEAD(&dentry->d_u.d_child);
 	}
 
 	spin_lock(&dcache_lock);
 	if (parent)
-		list_add(&dentry->d_child, &parent->d_subdirs);
+		list_add(&dentry->d_u.d_child, &parent->d_subdirs);
 	dentry_stat.nr_dentry++;
 	spin_unlock(&dcache_lock);
 
@@ -1310,8 +1310,8 @@ already_unhashed:
 	/* Unhash the target: dput() will then get rid of it */
 	__d_drop(target);
 
-	list_del(&dentry->d_child);
-	list_del(&target->d_child);
+	list_del(&dentry->d_u.d_child);
+	list_del(&target->d_u.d_child);
 
 	/* Switch the names.. */
 	switch_names(dentry, target);
@@ -1322,15 +1322,15 @@ already_unhashed:
 	if (IS_ROOT(dentry)) {
 		dentry->d_parent = target->d_parent;
 		target->d_parent = target;
-		INIT_LIST_HEAD(&target->d_child);
+		INIT_LIST_HEAD(&target->d_u.d_child);
 	} else {
 		do_switch(dentry->d_parent, target->d_parent);
 
 		/* And add them back to the (new) parent lists */
-		list_add(&target->d_child, &target->d_parent->d_subdirs);
+		list_add(&target->d_u.d_child, &target->d_parent->d_subdirs);
 	}
 
-	list_add(&dentry->d_child, &dentry->d_parent->d_subdirs);
+	list_add(&dentry->d_u.d_child, &dentry->d_parent->d_subdirs);
 	spin_unlock(&target->d_lock);
 	spin_unlock(&dentry->d_lock);
 	write_sequnlock(&rename_lock);
@@ -1568,7 +1568,7 @@ repeat:
 resume:
 	while (next != &this_parent->d_subdirs) {
 		struct list_head *tmp = next;
-		struct dentry *dentry = list_entry(tmp, struct dentry, d_child);
+		struct dentry *dentry = list_entry(tmp, struct dentry, d_u.d_child);
 		next = tmp->next;
 		if (d_unhashed(dentry)||!dentry->d_inode)
 			continue;
@@ -1579,7 +1579,7 @@ resume:
 		atomic_dec(&dentry->d_count);
 	}
 	if (this_parent != root) {
-		next = this_parent->d_child.next; 
+		next = this_parent->d_u.d_child.next;
 		atomic_dec(&this_parent->d_count);
 		this_parent = this_parent->d_parent;
 		goto resume;
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
new file mode 100644
index 00000000000000..4e4762389bdc56
--- /dev/null
+++ b/fs/drop_caches.c
@@ -0,0 +1,68 @@
+/*
+ * Implement the manual drop-all-pagecache function
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/writeback.h>
+#include <linux/sysctl.h>
+#include <linux/gfp.h>
+
+/* A global variable is a bit ugly, but it keeps the code simple */
+int sysctl_drop_caches;
+
+static void drop_pagecache_sb(struct super_block *sb)
+{
+	struct inode *inode;
+
+	spin_lock(&inode_lock);
+	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+		if (inode->i_state & (I_FREEING|I_WILL_FREE))
+			continue;
+		invalidate_inode_pages(inode->i_mapping);
+	}
+	spin_unlock(&inode_lock);
+}
+
+void drop_pagecache(void)
+{
+	struct super_block *sb;
+
+	spin_lock(&sb_lock);
+restart:
+	list_for_each_entry(sb, &super_blocks, s_list) {
+		sb->s_count++;
+		spin_unlock(&sb_lock);
+		down_read(&sb->s_umount);
+		if (sb->s_root)
+			drop_pagecache_sb(sb);
+		up_read(&sb->s_umount);
+		spin_lock(&sb_lock);
+		if (__put_super_and_need_restart(sb))
+			goto restart;
+	}
+	spin_unlock(&sb_lock);
+}
+
+void drop_slab(void)
+{
+	int nr_objects;
+
+	do {
+		nr_objects = shrink_slab(1000, GFP_KERNEL, 1000);
+	} while (nr_objects > 10);
+}
+
+int drop_caches_sysctl_handler(ctl_table *table, int write,
+	struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
+{
+	proc_dointvec_minmax(table, write, file, buffer, length, ppos);
+	if (write) {
+		if (sysctl_drop_caches & 1)
+			drop_pagecache();
+		if (sysctl_drop_caches & 2)
+			drop_slab();
+	}
+	return 0;
+}
diff --git a/fs/exec.c b/fs/exec.c
index e75a9548da8ef3..fd02ea4a81e96b 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -760,7 +760,7 @@ no_thread_group:
 		spin_lock(&oldsighand->siglock);
 		spin_lock(&newsighand->siglock);
 
-		current->sighand = newsighand;
+		rcu_assign_pointer(current->sighand, newsighand);
 		recalc_sigpending();
 
 		spin_unlock(&newsighand->siglock);
@@ -768,7 +768,7 @@ no_thread_group:
 		write_unlock_irq(&tasklist_lock);
 
 		if (atomic_dec_and_test(&oldsighand->count))
-			kmem_cache_free(sighand_cachep, oldsighand);
+			sighand_free(oldsighand);
 	}
 
 	BUG_ON(!thread_group_leader(current));
@@ -1462,6 +1462,7 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
 	if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) {
 		current->signal->flags = SIGNAL_GROUP_EXIT;
 		current->signal->group_exit_code = exit_code;
+		current->signal->group_stop_count = 0;
 		retval = 0;
 	}
 	spin_unlock_irq(&current->sighand->siglock);
@@ -1477,7 +1478,6 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
 	 * Clear any false indication of pending signals that might
 	 * be seen by the filesystem code called to write the core file.
 	 */
-	current->signal->group_stop_count = 0;
 	clear_thread_flag(TIF_SIGPENDING);
 
 	if (current->signal->rlim[RLIMIT_CORE].rlim_cur < binfmt->min_coredump)
@@ -1505,7 +1505,7 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
 		goto close_fail;
 	if (!file->f_op->write)
 		goto close_fail;
-	if (do_truncate(file->f_dentry, 0, file) != 0)
+	if (do_truncate(file->f_dentry, 0, 0, file) != 0)
 		goto close_fail;
 
 	retval = binfmt->core_dump(signr, regs, file);
diff --git a/fs/ext3/ialloc.c b/fs/ext3/ialloc.c
index 9e4a243762109a..69078079b19cc4 100644
--- a/fs/ext3/ialloc.c
+++ b/fs/ext3/ialloc.c
@@ -651,7 +651,7 @@ struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
 	/* Error cases - e2fsck has already cleaned up for us */
 	if (ino > max_ino) {
 		ext3_warning(sb, __FUNCTION__,
-			     "bad orphan ino %lu!  e2fsck was run?\n", ino);
+			     "bad orphan ino %lu!  e2fsck was run?", ino);
 		goto out;
 	}
 
@@ -660,7 +660,7 @@ struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
 	bitmap_bh = read_inode_bitmap(sb, block_group);
 	if (!bitmap_bh) {
 		ext3_warning(sb, __FUNCTION__,
-			     "inode bitmap error for orphan %lu\n", ino);
+			     "inode bitmap error for orphan %lu", ino);
 		goto out;
 	}
 
@@ -672,7 +672,7 @@ struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
 			!(inode = iget(sb, ino)) || is_bad_inode(inode) ||
 			NEXT_ORPHAN(inode) > max_ino) {
 		ext3_warning(sb, __FUNCTION__,
-			     "bad orphan inode %lu!  e2fsck was run?\n", ino);
+			     "bad orphan inode %lu!  e2fsck was run?", ino);
 		printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n",
 		       bit, (unsigned long long)bitmap_bh->b_blocknr,
 		       ext3_test_bit(bit, bitmap_bh->b_data));
diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
index b3c690a3b54acc..af193a304ee586 100644
--- a/fs/ext3/namei.c
+++ b/fs/ext3/namei.c
@@ -1476,7 +1476,7 @@ static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
 		if (levels && (dx_get_count(frames->entries) ==
 			       dx_get_limit(frames->entries))) {
 			ext3_warning(sb, __FUNCTION__,
-				     "Directory index full!\n");
+				     "Directory index full!");
 			err = -ENOSPC;
 			goto cleanup;
 		}
diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c
index 6104ad3105077e..1041dab6de2fd9 100644
--- a/fs/ext3/resize.c
+++ b/fs/ext3/resize.c
@@ -31,7 +31,7 @@ static int verify_group_input(struct super_block *sb,
 	unsigned start = le32_to_cpu(es->s_blocks_count);
 	unsigned end = start + input->blocks_count;
 	unsigned group = input->group;
-	unsigned itend = input->inode_table + EXT3_SB(sb)->s_itb_per_group;
+	unsigned itend = input->inode_table + sbi->s_itb_per_group;
 	unsigned overhead = ext3_bg_has_super(sb, group) ?
 		(1 + ext3_bg_num_gdb(sb, group) +
 		 le16_to_cpu(es->s_reserved_gdt_blocks)) : 0;
@@ -340,7 +340,7 @@ static int verify_reserved_gdb(struct super_block *sb,
 	while ((grp = ext3_list_backups(sb, &three, &five, &seven)) < end) {
 		if (le32_to_cpu(*p++) != grp * EXT3_BLOCKS_PER_GROUP(sb) + blk){
 			ext3_warning(sb, __FUNCTION__,
-				     "reserved GDT %ld missing grp %d (%ld)\n",
+				     "reserved GDT %ld missing grp %d (%ld)",
 				     blk, grp,
 				     grp * EXT3_BLOCKS_PER_GROUP(sb) + blk);
 			return -EINVAL;
@@ -393,7 +393,7 @@ static int add_new_gdb(handle_t *handle, struct inode *inode,
 	if (EXT3_SB(sb)->s_sbh->b_blocknr !=
 	    le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block)) {
 		ext3_warning(sb, __FUNCTION__,
-			"won't resize using backup superblock at %llu\n",
+			"won't resize using backup superblock at %llu",
 			(unsigned long long)EXT3_SB(sb)->s_sbh->b_blocknr);
 		return -EPERM;
 	}
@@ -417,7 +417,7 @@ static int add_new_gdb(handle_t *handle, struct inode *inode,
 	data = (__u32 *)dind->b_data;
 	if (le32_to_cpu(data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)]) != gdblock) {
 		ext3_warning(sb, __FUNCTION__,
-			     "new group %u GDT block %lu not reserved\n",
+			     "new group %u GDT block %lu not reserved",
 			     input->group, gdblock);
 		err = -EINVAL;
 		goto exit_dind;
@@ -540,7 +540,7 @@ static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
 	for (res = 0; res < reserved_gdb; res++, blk++) {
 		if (le32_to_cpu(*data) != blk) {
 			ext3_warning(sb, __FUNCTION__,
-				     "reserved block %lu not at offset %ld\n",
+				     "reserved block %lu not at offset %ld",
 				     blk, (long)(data - (__u32 *)dind->b_data));
 			err = -EINVAL;
 			goto exit_bh;
@@ -683,7 +683,7 @@ exit_err:
 	if (err) {
 		ext3_warning(sb, __FUNCTION__,
 			     "can't update backup for group %d (err %d), "
-			     "forcing fsck on next reboot\n", group, err);
+			     "forcing fsck on next reboot", group, err);
 		sbi->s_mount_state &= ~EXT3_VALID_FS;
 		sbi->s_es->s_state &= ~cpu_to_le16(EXT3_VALID_FS);
 		mark_buffer_dirty(sbi->s_sbh);
@@ -722,7 +722,7 @@ int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input)
 	if (gdb_off == 0 && !EXT3_HAS_RO_COMPAT_FEATURE(sb,
 					EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
 		ext3_warning(sb, __FUNCTION__,
-			     "Can't resize non-sparse filesystem further\n");
+			     "Can't resize non-sparse filesystem further");
 		return -EPERM;
 	}
 
@@ -730,13 +730,13 @@ int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input)
 		if (!EXT3_HAS_COMPAT_FEATURE(sb,
 					     EXT3_FEATURE_COMPAT_RESIZE_INODE)){
 			ext3_warning(sb, __FUNCTION__,
-				     "No reserved GDT blocks, can't resize\n");
+				     "No reserved GDT blocks, can't resize");
 			return -EPERM;
 		}
 		inode = iget(sb, EXT3_RESIZE_INO);
 		if (!inode || is_bad_inode(inode)) {
 			ext3_warning(sb, __FUNCTION__,
-				     "Error opening resize inode\n");
+				     "Error opening resize inode");
 			iput(inode);
 			return -ENOENT;
 		}
@@ -764,9 +764,9 @@ int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input)
 	}
 
 	lock_super(sb);
-	if (input->group != EXT3_SB(sb)->s_groups_count) {
+	if (input->group != sbi->s_groups_count) {
 		ext3_warning(sb, __FUNCTION__,
-			     "multiple resizers run on filesystem!\n");
+			     "multiple resizers run on filesystem!");
 		err = -EBUSY;
 		goto exit_journal;
 	}
@@ -799,7 +799,7 @@ int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input)
 	 * data.  So we need to be careful to set all of the relevant
 	 * group descriptor data etc. *before* we enable the group.
 	 *
-	 * The key field here is EXT3_SB(sb)->s_groups_count: as long as
+	 * The key field here is sbi->s_groups_count: as long as
 	 * that retains its old value, nobody is going to access the new
 	 * group.
 	 *
@@ -859,7 +859,7 @@ int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input)
 	smp_wmb();
 
 	/* Update the global fs size fields */
-	EXT3_SB(sb)->s_groups_count++;
+	sbi->s_groups_count++;
 
 	ext3_journal_dirty_metadata(handle, primary);
 
@@ -874,7 +874,7 @@ int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input)
 	percpu_counter_mod(&sbi->s_freeinodes_counter,
 			   EXT3_INODES_PER_GROUP(sb));
 
-	ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
+	ext3_journal_dirty_metadata(handle, sbi->s_sbh);
 	sb->s_dirt = 1;
 
 exit_journal:
@@ -937,7 +937,7 @@ int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es,
 
 	if (last == 0) {
 		ext3_warning(sb, __FUNCTION__,
-			     "need to use ext2online to resize further\n");
+			     "need to use ext2online to resize further");
 		return -EPERM;
 	}
 
@@ -973,7 +973,7 @@ int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es,
 	lock_super(sb);
 	if (o_blocks_count != le32_to_cpu(es->s_blocks_count)) {
 		ext3_warning(sb, __FUNCTION__,
-			     "multiple resizers run on filesystem!\n");
+			     "multiple resizers run on filesystem!");
 		err = -EBUSY;
 		goto exit_put;
 	}
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 4e6730622d9052..7c45acf94589c1 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -43,7 +43,8 @@
 #include "acl.h"
 #include "namei.h"
 
-static int ext3_load_journal(struct super_block *, struct ext3_super_block *);
+static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
+			     unsigned long journal_devnum);
 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
 			       int);
 static void ext3_commit_super (struct super_block * sb,
@@ -628,7 +629,7 @@ enum {
 	Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 	Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
-	Opt_commit, Opt_journal_update, Opt_journal_inum,
+	Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
@@ -666,6 +667,7 @@ static match_table_t tokens = {
 	{Opt_commit, "commit=%u"},
 	{Opt_journal_update, "journal=update"},
 	{Opt_journal_inum, "journal=%u"},
+	{Opt_journal_dev, "journal_dev=%u"},
 	{Opt_abort, "abort"},
 	{Opt_data_journal, "data=journal"},
 	{Opt_data_ordered, "data=ordered"},
@@ -705,8 +707,9 @@ static unsigned long get_sb_block(void **data)
 	return sb_block;
 }
 
-static int parse_options (char * options, struct super_block *sb,
-			  unsigned long * inum, unsigned long *n_blocks_count, int is_remount)
+static int parse_options (char *options, struct super_block *sb,
+			  unsigned long *inum, unsigned long *journal_devnum,
+			  unsigned long *n_blocks_count, int is_remount)
 {
 	struct ext3_sb_info *sbi = EXT3_SB(sb);
 	char * p;
@@ -839,6 +842,16 @@ static int parse_options (char * options, struct super_block *sb,
 				return 0;
 			*inum = option;
 			break;
+		case Opt_journal_dev:
+			if (is_remount) {
+				printk(KERN_ERR "EXT3-fs: cannot specify "
+				       "journal on remount\n");
+				return 0;
+			}
+			if (match_int(&args[0], &option))
+				return 0;
+			*journal_devnum = option;
+			break;
 		case Opt_noload:
 			set_opt (sbi->s_mount_opt, NOLOAD);
 			break;
@@ -1331,6 +1344,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 	unsigned long logic_sb_block;
 	unsigned long offset = 0;
 	unsigned long journal_inum = 0;
+	unsigned long journal_devnum = 0;
 	unsigned long def_mount_opts;
 	struct inode *root;
 	int blocksize;
@@ -1411,7 +1425,8 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 
 	set_opt(sbi->s_mount_opt, RESERVATION);
 
-	if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
+	if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
+			    NULL, 0))
 		goto failed_mount;
 
 	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
@@ -1622,7 +1637,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 	 */
 	if (!test_opt(sb, NOLOAD) &&
 	    EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
-		if (ext3_load_journal(sb, es))
+		if (ext3_load_journal(sb, es, journal_devnum))
 			goto failed_mount2;
 	} else if (journal_inum) {
 		if (ext3_create_journal(sb, es, journal_inum))
@@ -1902,15 +1917,24 @@ out_bdev:
 	return NULL;
 }
 
-static int ext3_load_journal(struct super_block * sb,
-			     struct ext3_super_block * es)
+static int ext3_load_journal(struct super_block *sb,
+			     struct ext3_super_block *es,
+			     unsigned long journal_devnum)
 {
 	journal_t *journal;
 	int journal_inum = le32_to_cpu(es->s_journal_inum);
-	dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
+	dev_t journal_dev;
 	int err = 0;
 	int really_read_only;
 
+	if (journal_devnum &&
+	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
+		printk(KERN_INFO "EXT3-fs: external journal device major/minor "
+			"numbers have changed\n");
+		journal_dev = new_decode_dev(journal_devnum);
+	} else
+		journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
+
 	really_read_only = bdev_read_only(sb->s_bdev);
 
 	/*
@@ -1969,6 +1993,16 @@ static int ext3_load_journal(struct super_block * sb,
 
 	EXT3_SB(sb)->s_journal = journal;
 	ext3_clear_journal_err(sb, es);
+
+	if (journal_devnum &&
+	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
+		es->s_journal_dev = cpu_to_le32(journal_devnum);
+		sb->s_dirt = 1;
+
+		/* Make sure we flush the recovery flag to disk. */
+		ext3_commit_super(sb, es, 1);
+	}
+
 	return 0;
 }
 
@@ -2197,7 +2231,7 @@ static int ext3_remount (struct super_block * sb, int * flags, char * data)
 	/*
 	 * Allow the "check" option to be passed as a remount option.
 	 */
-	if (!parse_options(data, sb, NULL, &n_blocks_count, 1)) {
+	if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
 		err = -EINVAL;
 		goto restore_opts;
 	}
diff --git a/fs/fat/cache.c b/fs/fat/cache.c
index 77c24fcf712aef..1acc941245fb4a 100644
--- a/fs/fat/cache.c
+++ b/fs/fat/cache.c
@@ -295,7 +295,8 @@ static int fat_bmap_cluster(struct inode *inode, int cluster)
 	return dclus;
 }
 
-int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys)
+int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
+	     unsigned long *mapped_blocks)
 {
 	struct super_block *sb = inode->i_sb;
 	struct msdos_sb_info *sbi = MSDOS_SB(sb);
@@ -303,9 +304,12 @@ int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys)
 	int cluster, offset;
 
 	*phys = 0;
+	*mapped_blocks = 0;
 	if ((sbi->fat_bits != 32) && (inode->i_ino == MSDOS_ROOT_INO)) {
-		if (sector < (sbi->dir_entries >> sbi->dir_per_block_bits))
+		if (sector < (sbi->dir_entries >> sbi->dir_per_block_bits)) {
 			*phys = sector + sbi->dir_start;
+			*mapped_blocks = 1;
+		}
 		return 0;
 	}
 	last_block = (MSDOS_I(inode)->mmu_private + (sb->s_blocksize - 1))
@@ -318,7 +322,11 @@ int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys)
 	cluster = fat_bmap_cluster(inode, cluster);
 	if (cluster < 0)
 		return cluster;
-	else if (cluster)
+	else if (cluster) {
 		*phys = fat_clus_to_blknr(sbi, cluster) + offset;
+		*mapped_blocks = sbi->sec_per_clus - offset;
+		if (*mapped_blocks > last_block - sector)
+			*mapped_blocks = last_block - sector;
+	}
 	return 0;
 }
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index ba824964b9bbaf..eef1b81aa294d8 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -45,8 +45,8 @@ static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
 	if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
 		return;
 
-	bh = sb_getblk(sb, phys);
-	if (bh && !buffer_uptodate(bh)) {
+	bh = sb_find_get_block(sb, phys);
+	if (bh == NULL || !buffer_uptodate(bh)) {
 		for (sec = 0; sec < sbi->sec_per_clus; sec++)
 			sb_breadahead(sb, phys + sec);
 	}
@@ -68,8 +68,8 @@ static int fat__get_entry(struct inode *dir, loff_t *pos,
 {
 	struct super_block *sb = dir->i_sb;
 	sector_t phys, iblock;
-	int offset;
-	int err;
+	unsigned long mapped_blocks;
+	int err, offset;
 
 next:
 	if (*bh)
@@ -77,7 +77,7 @@ next:
 
 	*bh = NULL;
 	iblock = *pos >> sb->s_blocksize_bits;
-	err = fat_bmap(dir, iblock, &phys);
+	err = fat_bmap(dir, iblock, &phys, &mapped_blocks);
 	if (err || !phys)
 		return -1;	/* beyond EOF or error */
 
@@ -418,7 +418,7 @@ EODir:
 	return err;
 }
 
-EXPORT_SYMBOL(fat_search_long);
+EXPORT_SYMBOL_GPL(fat_search_long);
 
 struct fat_ioctl_filldir_callback {
 	struct dirent __user *dirent;
@@ -780,7 +780,7 @@ int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
 	return -ENOENT;
 }
 
-EXPORT_SYMBOL(fat_get_dotdot_entry);
+EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
 
 /* See if directory is empty */
 int fat_dir_empty(struct inode *dir)
@@ -803,7 +803,7 @@ int fat_dir_empty(struct inode *dir)
 	return result;
 }
 
-EXPORT_SYMBOL(fat_dir_empty);
+EXPORT_SYMBOL_GPL(fat_dir_empty);
 
 /*
  * fat_subdirs counts the number of sub-directories of dir. It can be run
@@ -849,7 +849,7 @@ int fat_scan(struct inode *dir, const unsigned char *name,
 	return -ENOENT;
 }
 
-EXPORT_SYMBOL(fat_scan);
+EXPORT_SYMBOL_GPL(fat_scan);
 
 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
 {
@@ -936,7 +936,7 @@ int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
 	return 0;
 }
 
-EXPORT_SYMBOL(fat_remove_entries);
+EXPORT_SYMBOL_GPL(fat_remove_entries);
 
 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
 			      struct buffer_head **bhs, int nr_bhs)
@@ -1048,7 +1048,7 @@ error:
 	return err;
 }
 
-EXPORT_SYMBOL(fat_alloc_new_dir);
+EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
 
 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
 			       int *nr_cluster, struct msdos_dir_entry **de,
@@ -1264,4 +1264,4 @@ error_remove:
 	return err;
 }
 
-EXPORT_SYMBOL(fat_add_entries);
+EXPORT_SYMBOL_GPL(fat_add_entries);
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 4164cd54c4d1e6..a1a9e04512175c 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -476,6 +476,7 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
 				sbi->prev_free = entry;
 				if (sbi->free_clusters != -1)
 					sbi->free_clusters--;
+				sb->s_dirt = 1;
 
 				cluster[idx_clus] = entry;
 				idx_clus++;
@@ -496,6 +497,7 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
 
 	/* Couldn't allocate the free entries */
 	sbi->free_clusters = 0;
+	sb->s_dirt = 1;
 	err = -ENOSPC;
 
 out:
@@ -509,7 +511,6 @@ out:
 	}
 	for (i = 0; i < nr_bhs; i++)
 		brelse(bhs[i]);
-	fat_clusters_flush(sb);
 
 	if (err && idx_clus)
 		fat_free_clusters(inode, cluster[0]);
@@ -542,8 +543,10 @@ int fat_free_clusters(struct inode *inode, int cluster)
 		}
 
 		ops->ent_put(&fatent, FAT_ENT_FREE);
-		if (sbi->free_clusters != -1)
+		if (sbi->free_clusters != -1) {
 			sbi->free_clusters++;
+			sb->s_dirt = 1;
+		}
 
 		if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) {
 			if (sb->s_flags & MS_SYNCHRONOUS) {
@@ -578,7 +581,7 @@ error:
 	return err;
 }
 
-EXPORT_SYMBOL(fat_free_clusters);
+EXPORT_SYMBOL_GPL(fat_free_clusters);
 
 int fat_count_free_clusters(struct super_block *sb)
 {
@@ -605,6 +608,7 @@ int fat_count_free_clusters(struct super_block *sb)
 		} while (fat_ent_next(sbi, &fatent));
 	}
 	sbi->free_clusters = free;
+	sb->s_dirt = 1;
 	fatent_brelse(&fatent);
 out:
 	unlock_fat(sbi);
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 7134403d5be255..9b07c328a6fca0 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -11,6 +11,7 @@
 #include <linux/msdos_fs.h>
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
+#include <linux/writeback.h>
 
 int fat_generic_ioctl(struct inode *inode, struct file *filp,
 		      unsigned int cmd, unsigned long arg)
@@ -124,6 +125,24 @@ struct file_operations fat_file_operations = {
 	.sendfile	= generic_file_sendfile,
 };
 
+static int fat_cont_expand(struct inode *inode, loff_t size)
+{
+	struct address_space *mapping = inode->i_mapping;
+	loff_t start = inode->i_size, count = size - inode->i_size;
+	int err;
+
+	err = generic_cont_expand_simple(inode, size);
+	if (err)
+		goto out;
+
+	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+	if (IS_SYNC(inode))
+		err = sync_page_range_nolock(inode, mapping, start, count);
+out:
+	return err;
+}
+
 int fat_notify_change(struct dentry *dentry, struct iattr *attr)
 {
 	struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
@@ -132,11 +151,17 @@ int fat_notify_change(struct dentry *dentry, struct iattr *attr)
 
 	lock_kernel();
 
-	/* FAT cannot truncate to a longer file */
+	/*
+	 * Expand the file. Since inode_setattr() updates ->i_size
+	 * before calling the ->truncate(), but FAT needs to fill the
+	 * hole before it.
+	 */
 	if (attr->ia_valid & ATTR_SIZE) {
 		if (attr->ia_size > inode->i_size) {
-			error = -EPERM;
-			goto out;
+			error = fat_cont_expand(inode, attr->ia_size);
+			if (error || attr->ia_valid == ATTR_SIZE)
+				goto out;
+			attr->ia_valid &= ~ATTR_SIZE;
 		}
 	}
 
@@ -173,7 +198,7 @@ out:
 	return error;
 }
 
-EXPORT_SYMBOL(fat_notify_change);
+EXPORT_SYMBOL_GPL(fat_notify_change);
 
 /* Free all clusters after the skip'th cluster. */
 static int fat_free(struct inode *inode, int skip)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index a0f9b9fe1307ad..e7f4aa7fc6864b 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -18,10 +18,12 @@
 #include <linux/seq_file.h>
 #include <linux/msdos_fs.h>
 #include <linux/pagemap.h>
+#include <linux/mpage.h>
 #include <linux/buffer_head.h>
 #include <linux/mount.h>
 #include <linux/vfs.h>
 #include <linux/parser.h>
+#include <linux/uio.h>
 #include <asm/unaligned.h>
 
 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
@@ -48,51 +50,97 @@ static int fat_add_cluster(struct inode *inode)
 	return err;
 }
 
-static int fat_get_block(struct inode *inode, sector_t iblock,
-			 struct buffer_head *bh_result, int create)
+static int __fat_get_blocks(struct inode *inode, sector_t iblock,
+			    unsigned long *max_blocks,
+			    struct buffer_head *bh_result, int create)
 {
 	struct super_block *sb = inode->i_sb;
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
 	sector_t phys;
-	int err;
+	unsigned long mapped_blocks;
+	int err, offset;
 
-	err = fat_bmap(inode, iblock, &phys);
+	err = fat_bmap(inode, iblock, &phys, &mapped_blocks);
 	if (err)
 		return err;
 	if (phys) {
 		map_bh(bh_result, sb, phys);
+		*max_blocks = min(mapped_blocks, *max_blocks);
 		return 0;
 	}
 	if (!create)
 		return 0;
+
 	if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) {
 		fat_fs_panic(sb, "corrupted file size (i_pos %lld, %lld)",
 			     MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private);
 		return -EIO;
 	}
-	if (!((unsigned long)iblock & (MSDOS_SB(sb)->sec_per_clus - 1))) {
+
+	offset = (unsigned long)iblock & (sbi->sec_per_clus - 1);
+	if (!offset) {
+		/* TODO: multiple cluster allocation would be desirable. */
 		err = fat_add_cluster(inode);
 		if (err)
 			return err;
 	}
-	MSDOS_I(inode)->mmu_private += sb->s_blocksize;
-	err = fat_bmap(inode, iblock, &phys);
+	/* available blocks on this cluster */
+	mapped_blocks = sbi->sec_per_clus - offset;
+
+	*max_blocks = min(mapped_blocks, *max_blocks);
+	MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits;
+
+	err = fat_bmap(inode, iblock, &phys, &mapped_blocks);
 	if (err)
 		return err;
-	if (!phys)
-		BUG();
+	BUG_ON(!phys);
+	BUG_ON(*max_blocks != mapped_blocks);
 	set_buffer_new(bh_result);
 	map_bh(bh_result, sb, phys);
 	return 0;
 }
 
+static int fat_get_blocks(struct inode *inode, sector_t iblock,
+			  unsigned long max_blocks,
+			  struct buffer_head *bh_result, int create)
+{
+	struct super_block *sb = inode->i_sb;
+	int err;
+
+	err = __fat_get_blocks(inode, iblock, &max_blocks, bh_result, create);
+	if (err)
+		return err;
+	bh_result->b_size = max_blocks << sb->s_blocksize_bits;
+	return 0;
+}
+
+static int fat_get_block(struct inode *inode, sector_t iblock,
+			 struct buffer_head *bh_result, int create)
+{
+	unsigned long max_blocks = 1;
+	return __fat_get_blocks(inode, iblock, &max_blocks, bh_result, create);
+}
+
 static int fat_writepage(struct page *page, struct writeback_control *wbc)
 {
 	return block_write_full_page(page, fat_get_block, wbc);
 }
 
+static int fat_writepages(struct address_space *mapping,
+			  struct writeback_control *wbc)
+{
+	return mpage_writepages(mapping, wbc, fat_get_block);
+}
+
 static int fat_readpage(struct file *file, struct page *page)
 {
-	return block_read_full_page(page, fat_get_block);
+	return mpage_readpage(page, fat_get_block);
+}
+
+static int fat_readpages(struct file *file, struct address_space *mapping,
+			 struct list_head *pages, unsigned nr_pages)
+{
+	return mpage_readpages(mapping, pages, nr_pages, fat_get_block);
 }
 
 static int fat_prepare_write(struct file *file, struct page *page,
@@ -115,6 +163,34 @@ static int fat_commit_write(struct file *file, struct page *page,
 	return err;
 }
 
+static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
+			     const struct iovec *iov,
+			     loff_t offset, unsigned long nr_segs)
+{
+	struct file *file = iocb->ki_filp;
+	struct inode *inode = file->f_mapping->host;
+
+	if (rw == WRITE) {
+		/*
+		 * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(),
+		 * so we need to update the ->mmu_private to block boundary.
+		 *
+		 * But we must fill the remaining area or hole by nul for
+		 * updating ->mmu_private.
+		 */
+		loff_t size = offset + iov_length(iov, nr_segs);
+		if (MSDOS_I(inode)->mmu_private < size)
+			return -EINVAL;
+	}
+
+	/*
+	 * FAT need to use the DIO_LOCKING for avoiding the race
+	 * condition of fat_get_block() and ->truncate().
+	 */
+	return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+				  offset, nr_segs, fat_get_blocks, NULL);
+}
+
 static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
 {
 	return generic_block_bmap(mapping, block, fat_get_block);
@@ -122,10 +198,13 @@ static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
 
 static struct address_space_operations fat_aops = {
 	.readpage	= fat_readpage,
+	.readpages	= fat_readpages,
 	.writepage	= fat_writepage,
+	.writepages	= fat_writepages,
 	.sync_page	= block_sync_page,
 	.prepare_write	= fat_prepare_write,
 	.commit_write	= fat_commit_write,
+	.direct_IO	= fat_direct_IO,
 	.bmap		= _fat_bmap
 };
 
@@ -182,7 +261,7 @@ void fat_attach(struct inode *inode, loff_t i_pos)
 	spin_unlock(&sbi->inode_hash_lock);
 }
 
-EXPORT_SYMBOL(fat_attach);
+EXPORT_SYMBOL_GPL(fat_attach);
 
 void fat_detach(struct inode *inode)
 {
@@ -193,7 +272,7 @@ void fat_detach(struct inode *inode)
 	spin_unlock(&sbi->inode_hash_lock);
 }
 
-EXPORT_SYMBOL(fat_detach);
+EXPORT_SYMBOL_GPL(fat_detach);
 
 struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
 {
@@ -347,7 +426,7 @@ out:
 	return inode;
 }
 
-EXPORT_SYMBOL(fat_build_inode);
+EXPORT_SYMBOL_GPL(fat_build_inode);
 
 static void fat_delete_inode(struct inode *inode)
 {
@@ -374,12 +453,17 @@ static void fat_clear_inode(struct inode *inode)
 	unlock_kernel();
 }
 
-static void fat_put_super(struct super_block *sb)
+static void fat_write_super(struct super_block *sb)
 {
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
+	sb->s_dirt = 0;
 
 	if (!(sb->s_flags & MS_RDONLY))
 		fat_clusters_flush(sb);
+}
+
+static void fat_put_super(struct super_block *sb)
+{
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
 
 	if (sbi->nls_disk) {
 		unload_nls(sbi->nls_disk);
@@ -537,7 +621,7 @@ int fat_sync_inode(struct inode *inode)
 	return fat_write_inode(inode, 1);
 }
 
-EXPORT_SYMBOL(fat_sync_inode);
+EXPORT_SYMBOL_GPL(fat_sync_inode);
 
 static int fat_show_options(struct seq_file *m, struct vfsmount *mnt);
 static struct super_operations fat_sops = {
@@ -546,6 +630,7 @@ static struct super_operations fat_sops = {
 	.write_inode	= fat_write_inode,
 	.delete_inode	= fat_delete_inode,
 	.put_super	= fat_put_super,
+	.write_super	= fat_write_super,
 	.statfs		= fat_statfs,
 	.clear_inode	= fat_clear_inode,
 	.remount_fs	= fat_remount,
@@ -1347,7 +1432,7 @@ out_fail:
 	return error;
 }
 
-EXPORT_SYMBOL(fat_fill_super);
+EXPORT_SYMBOL_GPL(fat_fill_super);
 
 int __init fat_cache_init(void);
 void fat_cache_destroy(void);
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 2a0df2122f5d3d..32fb0a3f1da46b 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -33,7 +33,7 @@ void fat_fs_panic(struct super_block *s, const char *fmt, ...)
 	}
 }
 
-EXPORT_SYMBOL(fat_fs_panic);
+EXPORT_SYMBOL_GPL(fat_fs_panic);
 
 /* Flushes the number of free clusters on FAT32 */
 /* XXX: Need to write one per FSINFO block.  Currently only writes 1 */
@@ -67,8 +67,6 @@ void fat_clusters_flush(struct super_block *sb)
 		if (sbi->prev_free != -1)
 			fsinfo->next_cluster = cpu_to_le32(sbi->prev_free);
 		mark_buffer_dirty(bh);
-		if (sb->s_flags & MS_SYNCHRONOUS)
-			sync_dirty_buffer(bh);
 	}
 	brelse(bh);
 }
@@ -194,7 +192,7 @@ void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date)
 	*date = cpu_to_le16(nl_day-day_n[month-1]+1+(month << 5)+(year << 9));
 }
 
-EXPORT_SYMBOL(fat_date_unix2dos);
+EXPORT_SYMBOL_GPL(fat_date_unix2dos);
 
 int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
 {
@@ -222,4 +220,4 @@ int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
 	return err;
 }
 
-EXPORT_SYMBOL(fat_sync_bhs);
+EXPORT_SYMBOL_GPL(fat_sync_bhs);
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 863b46e0d78a65..9903bde475f2ec 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -457,11 +457,11 @@ static void send_sigio_to_task(struct task_struct *p,
 			else
 				si.si_band = band_table[reason - POLL_IN];
 			si.si_fd    = fd;
-			if (!send_group_sig_info(fown->signum, &si, p))
+			if (!group_send_sig_info(fown->signum, &si, p))
 				break;
 		/* fall-through: fall back on the old plain SIGIO signal */
 		case 0:
-			send_group_sig_info(SIGIO, SEND_SIG_PRIV, p);
+			group_send_sig_info(SIGIO, SEND_SIG_PRIV, p);
 	}
 }
 
@@ -495,7 +495,7 @@ static void send_sigurg_to_task(struct task_struct *p,
                                 struct fown_struct *fown)
 {
 	if (sigio_perm(p, fown, SIGURG))
-		send_group_sig_info(SIGURG, SEND_SIG_PRIV, p);
+		group_send_sig_info(SIGURG, SEND_SIG_PRIV, p);
 }
 
 int send_sigurg(struct fown_struct *fown)
diff --git a/fs/file_table.c b/fs/file_table.c
index c3a5e2fd663b77..6142250104a6db 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -117,7 +117,7 @@ EXPORT_SYMBOL(get_empty_filp);
 
 void fastcall fput(struct file *file)
 {
-	if (rcuref_dec_and_test(&file->f_count))
+	if (atomic_dec_and_test(&file->f_count))
 		__fput(file);
 }
 
@@ -166,7 +166,7 @@ struct file fastcall *fget(unsigned int fd)
 	rcu_read_lock();
 	file = fcheck_files(files, fd);
 	if (file) {
-		if (!rcuref_inc_lf(&file->f_count)) {
+		if (!atomic_inc_not_zero(&file->f_count)) {
 			/* File object ref couldn't be taken */
 			rcu_read_unlock();
 			return NULL;
@@ -198,7 +198,7 @@ struct file fastcall *fget_light(unsigned int fd, int *fput_needed)
 		rcu_read_lock();
 		file = fcheck_files(files, fd);
 		if (file) {
-			if (rcuref_inc_lf(&file->f_count))
+			if (atomic_inc_not_zero(&file->f_count))
 				*fput_needed = 1;
 			else
 				/* Didn't get the reference, someone's freed */
@@ -213,7 +213,7 @@ struct file fastcall *fget_light(unsigned int fd, int *fput_needed)
 
 void put_filp(struct file *file)
 {
-	if (rcuref_dec_and_test(&file->f_count)) {
+	if (atomic_dec_and_test(&file->f_count)) {
 		security_file_free(file);
 		file_kill(file);
 		file_free(file);
diff --git a/fs/freevxfs/vxfs_immed.c b/fs/freevxfs/vxfs_immed.c
index d0401dc68d4130..6f5df1700e9506 100644
--- a/fs/freevxfs/vxfs_immed.c
+++ b/fs/freevxfs/vxfs_immed.c
@@ -99,8 +99,8 @@ static int
 vxfs_immed_readpage(struct file *fp, struct page *pp)
 {
 	struct vxfs_inode_info	*vip = VXFS_INO(pp->mapping->host);
-	u_int64_t		offset = pp->index << PAGE_CACHE_SHIFT;
-	caddr_t			kaddr;
+	u_int64_t	offset = (u_int64_t)pp->index << PAGE_CACHE_SHIFT;
+	caddr_t		kaddr;
 
 	kaddr = kmap(pp);
 	memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
diff --git a/fs/inode.c b/fs/inode.c
index d8d04bd72b5951..fd568caf7f74f8 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -770,7 +770,7 @@ EXPORT_SYMBOL(igrab);
  *
  * Note, @test is called with the inode_lock held, so can't sleep.
  */
-static inline struct inode *ifind(struct super_block *sb,
+static struct inode *ifind(struct super_block *sb,
 		struct hlist_head *head, int (*test)(struct inode *, void *),
 		void *data, const int wait)
 {
@@ -804,7 +804,7 @@ static inline struct inode *ifind(struct super_block *sb,
  *
  * Otherwise NULL is returned.
  */
-static inline struct inode *ifind_fast(struct super_block *sb,
+static struct inode *ifind_fast(struct super_block *sb,
 		struct hlist_head *head, unsigned long ino)
 {
 	struct inode *inode;
diff --git a/fs/jffs/inode-v23.c b/fs/jffs/inode-v23.c
index 3dcc6d2162cb81..2559ee10beda19 100644
--- a/fs/jffs/inode-v23.c
+++ b/fs/jffs/inode-v23.c
@@ -757,7 +757,7 @@ jffs_do_readpage_nolock(struct file *file, struct page *page)
 
 	read_len = 0;
 	result = 0;
-	offset = page->index << PAGE_CACHE_SHIFT;
+	offset = page_offset(page);
 
 	kmap(page);
 	buf = page_address(page);
@@ -1545,7 +1545,7 @@ jffs_commit_write(struct file *filp, struct page *page,
 {
        void *addr = page_address(page) + from;
        /* XXX: PAGE_CACHE_SHIFT or PAGE_SHIFT */
-       loff_t pos = (page->index<<PAGE_CACHE_SHIFT) + from;
+       loff_t pos = page_offset(page) + from;
 
        return jffs_file_write(filp, addr, to-from, &pos);
 } /* jffs_commit_write() */
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index 68000a50ceb606..2967b73934151f 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -302,8 +302,7 @@ int dbSync(struct inode *ipbmap)
 	/*
 	 * write out dirty pages of bmap
 	 */
-	filemap_fdatawrite(ipbmap->i_mapping);
-	filemap_fdatawait(ipbmap->i_mapping);
+	filemap_write_and_wait(ipbmap->i_mapping);
 
 	diWriteSpecial(ipbmap, 0);
 
diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index 28201b194f531b..31b4aa13dd4b98 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -265,8 +265,7 @@ int diSync(struct inode *ipimap)
 	/*
 	 * write out dirty pages of imap
 	 */
-	filemap_fdatawrite(ipimap->i_mapping);
-	filemap_fdatawait(ipimap->i_mapping);
+	filemap_write_and_wait(ipimap->i_mapping);
 
 	diWriteSpecial(ipimap, 0);
 
@@ -565,8 +564,7 @@ void diFreeSpecial(struct inode *ip)
 		jfs_err("diFreeSpecial called with NULL ip!");
 		return;
 	}
-	filemap_fdatawrite(ip->i_mapping);
-	filemap_fdatawait(ip->i_mapping);
+	filemap_write_and_wait(ip->i_mapping);
 	truncate_inode_pages(ip->i_mapping, 0);
 	iput(ip);
 }
diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index b660c93c92deaf..2ddb6b892bcf17 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -1231,10 +1231,8 @@ int txCommit(tid_t tid,		/* transaction identifier */
 		 * when we don't need to worry about it at all.
 		 *
 		 * if ((!S_ISDIR(ip->i_mode))
-		 *    && (tblk->flag & COMMIT_DELETE) == 0) {
-		 *	filemap_fdatawrite(ip->i_mapping);
-		 *	filemap_fdatawait(ip->i_mapping);
-		 * }
+		 *    && (tblk->flag & COMMIT_DELETE) == 0)
+		 *	filemap_write_and_wait(ip->i_mapping);
 		 */
 
 		/*
diff --git a/fs/jfs/jfs_umount.c b/fs/jfs/jfs_umount.c
index 5cf91785b5416b..21eaf7ac0fcb6c 100644
--- a/fs/jfs/jfs_umount.c
+++ b/fs/jfs/jfs_umount.c
@@ -108,8 +108,7 @@ int jfs_umount(struct super_block *sb)
 	 * Make sure all metadata makes it to disk before we mark
 	 * the superblock as clean
 	 */
-	filemap_fdatawrite(sbi->direct_inode->i_mapping);
-	filemap_fdatawait(sbi->direct_inode->i_mapping);
+	filemap_write_and_wait(sbi->direct_inode->i_mapping);
 
 	/*
 	 * ensure all file system file pages are propagated to their
@@ -161,8 +160,7 @@ int jfs_umount_rw(struct super_block *sb)
 	 * mark the superblock clean before everything is flushed to
 	 * disk.
 	 */
-	filemap_fdatawrite(sbi->direct_inode->i_mapping);
-	filemap_fdatawait(sbi->direct_inode->i_mapping);
+	filemap_write_and_wait(sbi->direct_inode->i_mapping);
 
 	updateSuper(sb, FM_CLEAN);
 
diff --git a/fs/jfs/resize.c b/fs/jfs/resize.c
index c6dc254d325325..45180361871c9a 100644
--- a/fs/jfs/resize.c
+++ b/fs/jfs/resize.c
@@ -376,8 +376,7 @@ int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
 	 * by txCommit();
 	 */
 	filemap_fdatawait(ipbmap->i_mapping);
-	filemap_fdatawrite(ipbmap->i_mapping);
-	filemap_fdatawait(ipbmap->i_mapping);
+	filemap_write_and_wait(ipbmap->i_mapping);
 	diWriteSpecial(ipbmap, 0);
 
 	newPage = nPages;	/* first new page number */
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 4226af3ea91bc1..8d31f1336431a9 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -502,8 +502,7 @@ out_no_rw:
 		jfs_err("jfs_umount failed with return code %d", rc);
 	}
 out_mount_failed:
-	filemap_fdatawrite(sbi->direct_inode->i_mapping);
-	filemap_fdatawait(sbi->direct_inode->i_mapping);
+	filemap_write_and_wait(sbi->direct_inode->i_mapping);
 	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 	make_bad_inode(sbi->direct_inode);
 	iput(sbi->direct_inode);
diff --git a/fs/libfs.c b/fs/libfs.c
index 58101dff2c66de..9c50523382e7ec 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -93,16 +93,16 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
 			loff_t n = file->f_pos - 2;
 
 			spin_lock(&dcache_lock);
-			list_del(&cursor->d_child);
+			list_del(&cursor->d_u.d_child);
 			p = file->f_dentry->d_subdirs.next;
 			while (n && p != &file->f_dentry->d_subdirs) {
 				struct dentry *next;
-				next = list_entry(p, struct dentry, d_child);
+				next = list_entry(p, struct dentry, d_u.d_child);
 				if (!d_unhashed(next) && next->d_inode)
 					n--;
 				p = p->next;
 			}
-			list_add_tail(&cursor->d_child, p);
+			list_add_tail(&cursor->d_u.d_child, p);
 			spin_unlock(&dcache_lock);
 		}
 	}
@@ -126,7 +126,7 @@ int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
 {
 	struct dentry *dentry = filp->f_dentry;
 	struct dentry *cursor = filp->private_data;
-	struct list_head *p, *q = &cursor->d_child;
+	struct list_head *p, *q = &cursor->d_u.d_child;
 	ino_t ino;
 	int i = filp->f_pos;
 
@@ -153,7 +153,7 @@ int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
 			}
 			for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
 				struct dentry *next;
-				next = list_entry(p, struct dentry, d_child);
+				next = list_entry(p, struct dentry, d_u.d_child);
 				if (d_unhashed(next) || !next->d_inode)
 					continue;
 
@@ -261,7 +261,7 @@ int simple_empty(struct dentry *dentry)
 	int ret = 0;
 
 	spin_lock(&dcache_lock);
-	list_for_each_entry(child, &dentry->d_subdirs, d_child)
+	list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child)
 		if (simple_positive(child))
 			goto out;
 	ret = 1;
diff --git a/fs/locks.c b/fs/locks.c
index fb32d6218e213e..909eab8fb1d09b 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -154,7 +154,7 @@ static struct file_lock *locks_alloc_lock(void)
 }
 
 /* Free a lock which is not in use. */
-static inline void locks_free_lock(struct file_lock *fl)
+static void locks_free_lock(struct file_lock *fl)
 {
 	if (fl == NULL) {
 		BUG();
@@ -475,8 +475,7 @@ static inline int locks_overlap(struct file_lock *fl1, struct file_lock *fl2)
 /*
  * Check whether two locks have the same owner.
  */
-static inline int
-posix_same_owner(struct file_lock *fl1, struct file_lock *fl2)
+static int posix_same_owner(struct file_lock *fl1, struct file_lock *fl2)
 {
 	if (fl1->fl_lmops && fl1->fl_lmops->fl_compare_owner)
 		return fl2->fl_lmops == fl1->fl_lmops &&
@@ -487,7 +486,7 @@ posix_same_owner(struct file_lock *fl1, struct file_lock *fl2)
 /* Remove waiter from blocker's block list.
  * When blocker ends up pointing to itself then the list is empty.
  */
-static inline void __locks_delete_block(struct file_lock *waiter)
+static void __locks_delete_block(struct file_lock *waiter)
 {
 	list_del_init(&waiter->fl_block);
 	list_del_init(&waiter->fl_link);
diff --git a/fs/mpage.c b/fs/mpage.c
index f1d2d02bd4c81e..e431cb3878d699 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -184,7 +184,7 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
 	if (page_has_buffers(page))
 		goto confused;
 
-	block_in_file = page->index << (PAGE_CACHE_SHIFT - blkbits);
+	block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
 	last_block = (i_size_read(inode) + blocksize - 1) >> blkbits;
 
 	bh.b_page = page;
@@ -466,7 +466,7 @@ __mpage_writepage(struct bio *bio, struct page *page, get_block_t get_block,
 	 * The page has no buffers: map it to disk
 	 */
 	BUG_ON(!PageUptodate(page));
-	block_in_file = page->index << (PAGE_CACHE_SHIFT - blkbits);
+	block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
 	last_block = (i_size - 1) >> blkbits;
 	map_bh.b_page = page;
 	for (page_block = 0; page_block < blocks_per_page; ) {
diff --git a/fs/namei.c b/fs/namei.c
index 6dbbd42d8b95fb..300eae088d5f8c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1491,7 +1491,7 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
 		if (!error) {
 			DQUOT_INIT(inode);
 			
-			error = do_truncate(dentry, 0, NULL);
+			error = do_truncate(dentry, 0, ATTR_MTIME|ATTR_CTIME, NULL);
 		}
 		put_write_access(inode);
 		if (error)
diff --git a/fs/namespace.c b/fs/namespace.c
index 2019899f2ab822..3e8fb61ad597cf 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -451,7 +451,7 @@ EXPORT_SYMBOL(may_umount);
 void release_mounts(struct list_head *head)
 {
 	struct vfsmount *mnt;
-	while(!list_empty(head)) {
+	while (!list_empty(head)) {
 		mnt = list_entry(head->next, struct vfsmount, mnt_hash);
 		list_del_init(&mnt->mnt_hash);
 		if (mnt->mnt_parent != mnt) {
@@ -1526,6 +1526,10 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
  * pointed to by put_old must yield the same directory as new_root. No other
  * file system may be mounted on put_old. After all, new_root is a mountpoint.
  *
+ * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem.
+ * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives
+ * in this situation.
+ *
  * Notes:
  *  - we don't move root/cwd if they are not at the root (reason: if something
  *    cared enough to change them, it's probably wrong to force them elsewhere)
diff --git a/fs/ncpfs/dir.c b/fs/ncpfs/dir.c
index a9f7a8ab1d595d..cfd76f431dc0ec 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -365,7 +365,7 @@ ncp_dget_fpos(struct dentry *dentry, struct dentry *parent, unsigned long fpos)
 	spin_lock(&dcache_lock);
 	next = parent->d_subdirs.next;
 	while (next != &parent->d_subdirs) {
-		dent = list_entry(next, struct dentry, d_child);
+		dent = list_entry(next, struct dentry, d_u.d_child);
 		if ((unsigned long)dent->d_fsdata == fpos) {
 			if (dent->d_inode)
 				dget_locked(dent);
diff --git a/fs/ncpfs/ncplib_kernel.h b/fs/ncpfs/ncplib_kernel.h
index 9e4dc30c2435c2..799e5c2bec55bf 100644
--- a/fs/ncpfs/ncplib_kernel.h
+++ b/fs/ncpfs/ncplib_kernel.h
@@ -196,7 +196,7 @@ ncp_renew_dentries(struct dentry *parent)
 	spin_lock(&dcache_lock);
 	next = parent->d_subdirs.next;
 	while (next != &parent->d_subdirs) {
-		dentry = list_entry(next, struct dentry, d_child);
+		dentry = list_entry(next, struct dentry, d_u.d_child);
 
 		if (dentry->d_fsdata == NULL)
 			ncp_age_dentry(server, dentry);
@@ -218,7 +218,7 @@ ncp_invalidate_dircache_entries(struct dentry *parent)
 	spin_lock(&dcache_lock);
 	next = parent->d_subdirs.next;
 	while (next != &parent->d_subdirs) {
-		dentry = list_entry(next, struct dentry, d_child);
+		dentry = list_entry(next, struct dentry, d_u.d_child);
 		dentry->d_fsdata = NULL;
 		ncp_age_dentry(server, dentry);
 		next = next->next;
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index e7bd0d92600f6e..3e4ba9cb7f806c 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -644,10 +644,7 @@ int nfs_sync_mapping(struct address_space *mapping)
 	if (mapping->nrpages == 0)
 		return 0;
 	unmap_mapping_range(mapping, 0, 0, 0);
-	ret = filemap_fdatawrite(mapping);
-	if (ret != 0)
-		goto out;
-	ret = filemap_fdatawait(mapping);
+	ret = filemap_write_and_wait(mapping);
 	if (ret != 0)
 		goto out;
 	ret = nfs_wb_all(mapping->host);
@@ -864,8 +861,7 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
 	nfs_begin_data_update(inode);
 	/* Write all dirty data if we're changing file permissions or size */
 	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
-		if (filemap_fdatawrite(inode->i_mapping) == 0)
-			filemap_fdatawait(inode->i_mapping);
+		filemap_write_and_wait(inode->i_mapping);
 		nfs_wb_all(inode);
 	}
 	/*
diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index 985cc53b8dd5b3..e897e00c2c9d3c 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -275,7 +275,9 @@ static int __init root_nfs_parse(char *name, char *buf)
 			case Opt_noacl:
 				nfs_data.flags |= NFS_MOUNT_NOACL;
 				break;
-			default : 
+			default:
+				printk(KERN_WARNING "Root-NFS: unknown "
+					"option: %s\n", p);
 				return 0;
 		}
 	}
diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h
index f5ef5ea61a05af..e8c56a3d9c646d 100644
--- a/fs/ocfs2/cluster/masklog.h
+++ b/fs/ocfs2/cluster/masklog.h
@@ -212,11 +212,10 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
 	mlog(ML_ENTRY, "ENTRY:\n");					\
 } while (0)
 
-/* We disable this for old compilers since they don't have support for
- * __builtin_types_compatible_p.
+/*
+ * We disable this for sparse.
  */
-#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) && \
-    !defined(__CHECKER__)
+#if !defined(__CHECKER__)
 #define mlog_exit(st) do {						     \
 	if (__builtin_types_compatible_p(typeof(st), unsigned long))	     \
 		mlog(ML_EXIT, "EXIT: %lu\n", (unsigned long) (st));	     \
diff --git a/fs/open.c b/fs/open.c
index f53a5b9ffb7dce..75f3329e8a6788 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -194,7 +194,8 @@ out:
 	return error;
 }
 
-int do_truncate(struct dentry *dentry, loff_t length, struct file *filp)
+int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
+	struct file *filp)
 {
 	int err;
 	struct iattr newattrs;
@@ -204,7 +205,7 @@ int do_truncate(struct dentry *dentry, loff_t length, struct file *filp)
 		return -EINVAL;
 
 	newattrs.ia_size = length;
-	newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
+	newattrs.ia_valid = ATTR_SIZE | time_attrs;
 	if (filp) {
 		newattrs.ia_file = filp;
 		newattrs.ia_valid |= ATTR_FILE;
@@ -216,7 +217,7 @@ int do_truncate(struct dentry *dentry, loff_t length, struct file *filp)
 	return err;
 }
 
-static inline long do_sys_truncate(const char __user * path, loff_t length)
+static long do_sys_truncate(const char __user * path, loff_t length)
 {
 	struct nameidata nd;
 	struct inode * inode;
@@ -266,7 +267,7 @@ static inline long do_sys_truncate(const char __user * path, loff_t length)
 	error = locks_verify_truncate(inode, NULL, length);
 	if (!error) {
 		DQUOT_INIT(inode);
-		error = do_truncate(nd.dentry, length, NULL);
+		error = do_truncate(nd.dentry, length, 0, NULL);
 	}
 	put_write_access(inode);
 
@@ -282,7 +283,7 @@ asmlinkage long sys_truncate(const char __user * path, unsigned long length)
 	return do_sys_truncate(path, (long)length);
 }
 
-static inline long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
+static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 {
 	struct inode * inode;
 	struct dentry *dentry;
@@ -318,7 +319,7 @@ static inline long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 
 	error = locks_verify_truncate(inode, file, length);
 	if (!error)
-		error = do_truncate(dentry, length, file);
+		error = do_truncate(dentry, length, 0, file);
 out_putf:
 	fput(file);
 out:
@@ -970,7 +971,7 @@ out:
 
 EXPORT_SYMBOL(get_unused_fd);
 
-static inline void __put_unused_fd(struct files_struct *files, unsigned int fd)
+static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 {
 	struct fdtable *fdt = files_fdtable(files);
 	__FD_CLR(fd, fdt->open_fds);
diff --git a/fs/pnode.c b/fs/pnode.c
index aeeec8ba8dd28b..f1871f773f642c 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -103,7 +103,7 @@ static struct vfsmount *propagation_next(struct vfsmount *m,
 		struct vfsmount *next;
 		struct vfsmount *master = m->mnt_master;
 
-		if ( master == origin->mnt_master ) {
+		if (master == origin->mnt_master) {
 			next = next_peer(m);
 			return ((next == origin) ? NULL : next);
 		} else if (m->mnt_slave.next != &master->mnt_slave_list)
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 72b431d0a0a412..20e5c4509a4389 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -21,6 +21,8 @@
 #include <linux/bitops.h>
 #include <asm/uaccess.h>
 
+#include "internal.h"
+
 static ssize_t proc_file_read(struct file *file, char __user *buf,
 			      size_t nbytes, loff_t *ppos);
 static ssize_t proc_file_write(struct file *file, const char __user *buffer,
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index e6a818a93f3d75..6573f31f1fd9a1 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -19,7 +19,7 @@
 #include <asm/system.h>
 #include <asm/uaccess.h>
 
-extern void free_proc_entry(struct proc_dir_entry *);
+#include "internal.h"
 
 static inline struct proc_dir_entry * de_get(struct proc_dir_entry *de)
 {
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 3e55198f980628..95a1cf32b838e1 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -37,6 +37,10 @@ extern int proc_tgid_stat(struct task_struct *, char *);
 extern int proc_pid_status(struct task_struct *, char *);
 extern int proc_pid_statm(struct task_struct *, char *);
 
+void free_proc_entry(struct proc_dir_entry *de);
+
+int proc_init_inodecache(void);
+
 static inline struct task_struct *proc_task(struct inode *inode)
 {
 	return PROC_I(inode)->task;
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 5b6b0b6038a7bc..63bf6c00fa0ccc 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -323,6 +323,7 @@ static struct file_operations proc_modules_operations = {
 };
 #endif
 
+#ifdef CONFIG_SLAB
 extern struct seq_operations slabinfo_op;
 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 static int slabinfo_open(struct inode *inode, struct file *file)
@@ -336,6 +337,7 @@ static struct file_operations proc_slabinfo_operations = {
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };
+#endif
 
 static int show_stat(struct seq_file *p, void *v)
 {
@@ -600,7 +602,9 @@ void __init proc_misc_init(void)
 	create_seq_entry("partitions", 0, &proc_partitions_operations);
 	create_seq_entry("stat", 0, &proc_stat_operations);
 	create_seq_entry("interrupts", 0, &proc_interrupts_operations);
+#ifdef CONFIG_SLAB
 	create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
+#endif
 	create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 	create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 	create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
diff --git a/fs/proc/root.c b/fs/proc/root.c
index aef148f099a289..68896283c8ae54 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -18,6 +18,8 @@
 #include <linux/bitops.h>
 #include <linux/smp_lock.h>
 
+#include "internal.h"
+
 struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver;
 
 #ifdef CONFIG_SYSCTL
@@ -36,7 +38,6 @@ static struct file_system_type proc_fs_type = {
 	.kill_sb	= kill_anon_super,
 };
 
-extern int __init proc_init_inodecache(void);
 void __init proc_root_init(void)
 {
 	int err = proc_init_inodecache();
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 50bd5a8f0446d9..0eaad41f4658f3 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -390,129 +390,12 @@ struct seq_operations proc_pid_smaps_op = {
 };
 
 #ifdef CONFIG_NUMA
-
-struct numa_maps {
-	unsigned long pages;
-	unsigned long anon;
-	unsigned long mapped;
-	unsigned long mapcount_max;
-	unsigned long node[MAX_NUMNODES];
-};
-
-/*
- * Calculate numa node maps for a vma
- */
-static struct numa_maps *get_numa_maps(struct vm_area_struct *vma)
-{
-	int i;
-	struct page *page;
-	unsigned long vaddr;
-	struct numa_maps *md = kmalloc(sizeof(struct numa_maps), GFP_KERNEL);
-
-	if (!md)
-		return NULL;
-	md->pages = 0;
-	md->anon = 0;
-	md->mapped = 0;
-	md->mapcount_max = 0;
-	for_each_node(i)
-		md->node[i] =0;
-
- 	for (vaddr = vma->vm_start; vaddr < vma->vm_end; vaddr += PAGE_SIZE) {
-		page = follow_page(vma, vaddr, 0);
-		if (page) {
-			int count = page_mapcount(page);
-
-			if (count)
-				md->mapped++;
-			if (count > md->mapcount_max)
-				md->mapcount_max = count;
-			md->pages++;
-			if (PageAnon(page))
-				md->anon++;
-			md->node[page_to_nid(page)]++;
-		}
-		cond_resched();
-	}
-	return md;
-}
-
-static int show_numa_map(struct seq_file *m, void *v)
-{
-	struct task_struct *task = m->private;
-	struct vm_area_struct *vma = v;
-	struct mempolicy *pol;
-	struct numa_maps *md;
-	struct zone **z;
-	int n;
-	int first;
-
-	if (!vma->vm_mm)
-		return 0;
-
-	md = get_numa_maps(vma);
-	if (!md)
-		return 0;
-
-	seq_printf(m, "%08lx", vma->vm_start);
-	pol = get_vma_policy(task, vma, vma->vm_start);
-	/* Print policy */
-	switch (pol->policy) {
-	case MPOL_PREFERRED:
-		seq_printf(m, " prefer=%d", pol->v.preferred_node);
-		break;
-	case MPOL_BIND:
-		seq_printf(m, " bind={");
-		first = 1;
-		for (z = pol->v.zonelist->zones; *z; z++) {
-
-			if (!first)
-				seq_putc(m, ',');
-			else
-				first = 0;
-			seq_printf(m, "%d/%s", (*z)->zone_pgdat->node_id,
-					(*z)->name);
-		}
-		seq_putc(m, '}');
-		break;
-	case MPOL_INTERLEAVE:
-		seq_printf(m, " interleave={");
-		first = 1;
-		for_each_node(n) {
-			if (node_isset(n, pol->v.nodes)) {
-				if (!first)
-					seq_putc(m,',');
-				else
-					first = 0;
-				seq_printf(m, "%d",n);
-			}
-		}
-		seq_putc(m, '}');
-		break;
-	default:
-		seq_printf(m," default");
-		break;
-	}
-	seq_printf(m, " MaxRef=%lu Pages=%lu Mapped=%lu",
-			md->mapcount_max, md->pages, md->mapped);
-	if (md->anon)
-		seq_printf(m," Anon=%lu",md->anon);
-
-	for_each_online_node(n) {
-		if (md->node[n])
-			seq_printf(m, " N%d=%lu", n, md->node[n]);
-	}
-	seq_putc(m, '\n');
-	kfree(md);
-	if (m->count < m->size)  /* vma is copied successfully */
-		m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0;
-	return 0;
-}
+extern int show_numa_map(struct seq_file *m, void *v);
 
 struct seq_operations proc_pid_numa_maps_op = {
-	.start	= m_start,
-	.next	= m_next,
-	.stop	= m_stop,
-	.show	= show_numa_map
+        .start  = m_start,
+        .next   = m_next,
+        .stop   = m_stop,
+        .show   = show_numa_map
 };
 #endif
diff --git a/fs/relayfs/buffers.c b/fs/relayfs/buffers.c
index 84e21ffa5ca8e8..10187812771ef5 100644
--- a/fs/relayfs/buffers.c
+++ b/fs/relayfs/buffers.c
@@ -185,5 +185,6 @@ void relay_destroy_buf(struct rchan_buf *buf)
 void relay_remove_buf(struct kref *kref)
 {
 	struct rchan_buf *buf = container_of(kref, struct rchan_buf, kref);
-	relayfs_remove(buf->dentry);
+	buf->chan->cb->remove_buf_file(buf->dentry);
+	relay_destroy_buf(buf);
 }
diff --git a/fs/relayfs/inode.c b/fs/relayfs/inode.c
index 0f7f88d067adad..7b7f2cb5f0e1da 100644
--- a/fs/relayfs/inode.c
+++ b/fs/relayfs/inode.c
@@ -26,31 +26,22 @@
 
 static struct vfsmount *		relayfs_mount;
 static int				relayfs_mount_count;
-static kmem_cache_t *			relayfs_inode_cachep;
 
 static struct backing_dev_info		relayfs_backing_dev_info = {
 	.ra_pages	= 0,	/* No readahead */
 	.capabilities	= BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
 };
 
-static struct inode *relayfs_get_inode(struct super_block *sb, int mode,
-				       struct rchan *chan)
+static struct inode *relayfs_get_inode(struct super_block *sb,
+				       int mode,
+ 				       struct file_operations *fops,
+				       void *data)
 {
-	struct rchan_buf *buf = NULL;
 	struct inode *inode;
 
-	if (S_ISREG(mode)) {
-		BUG_ON(!chan);
-		buf = relay_create_buf(chan);
-		if (!buf)
-			return NULL;
-	}
-
 	inode = new_inode(sb);
-	if (!inode) {
-		relay_destroy_buf(buf);
+	if (!inode)
 		return NULL;
-	}
 
 	inode->i_mode = mode;
 	inode->i_uid = 0;
@@ -61,8 +52,9 @@ static struct inode *relayfs_get_inode(struct super_block *sb, int mode,
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 	switch (mode & S_IFMT) {
 	case S_IFREG:
-		inode->i_fop = &relayfs_file_operations;
-		RELAYFS_I(inode)->buf = buf;
+		inode->i_fop = fops;
+		if (data)
+			inode->u.generic_ip = data;
 		break;
 	case S_IFDIR:
 		inode->i_op = &simple_dir_inode_operations;
@@ -83,7 +75,8 @@ static struct inode *relayfs_get_inode(struct super_block *sb, int mode,
  *	@name: the name of the file to create
  *	@parent: parent directory
  *	@mode: mode
- *	@chan: relay channel associated with the file
+ *	@fops: file operations to use for the file
+ *	@data: user-associated data for this file
  *
  *	Returns the new dentry, NULL on failure
  *
@@ -92,7 +85,8 @@ static struct inode *relayfs_get_inode(struct super_block *sb, int mode,
 static struct dentry *relayfs_create_entry(const char *name,
 					   struct dentry *parent,
 					   int mode,
-					   struct rchan *chan)
+					   struct file_operations *fops,
+					   void *data)
 {
 	struct dentry *d;
 	struct inode *inode;
@@ -127,7 +121,7 @@ static struct dentry *relayfs_create_entry(const char *name,
 		goto release_mount;
 	}
 
-	inode = relayfs_get_inode(parent->d_inode->i_sb, mode, chan);
+	inode = relayfs_get_inode(parent->d_inode->i_sb, mode, fops, data);
 	if (!inode) {
 		d = NULL;
 		goto release_mount;
@@ -155,20 +149,26 @@ exit:
  *	@name: the name of the file to create
  *	@parent: parent directory
  *	@mode: mode, if not specied the default perms are used
- *	@chan: channel associated with the file
+ *	@fops: file operations to use for the file
+ *	@data: user-associated data for this file
  *
  *	Returns file dentry if successful, NULL otherwise.
  *
  *	The file will be created user r on behalf of current user.
  */
-struct dentry *relayfs_create_file(const char *name, struct dentry *parent,
-				   int mode, struct rchan *chan)
+struct dentry *relayfs_create_file(const char *name,
+				   struct dentry *parent,
+				   int mode,
+				   struct file_operations *fops,
+				   void *data)
 {
+	BUG_ON(!fops);
+
 	if (!mode)
 		mode = S_IRUSR;
 	mode = (mode & S_IALLUGO) | S_IFREG;
 
-	return relayfs_create_entry(name, parent, mode, chan);
+	return relayfs_create_entry(name, parent, mode, fops, data);
 }
 
 /**
@@ -183,7 +183,7 @@ struct dentry *relayfs_create_file(const char *name, struct dentry *parent,
 struct dentry *relayfs_create_dir(const char *name, struct dentry *parent)
 {
 	int mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
-	return relayfs_create_entry(name, parent, mode, NULL);
+	return relayfs_create_entry(name, parent, mode, NULL, NULL);
 }
 
 /**
@@ -225,6 +225,17 @@ int relayfs_remove(struct dentry *dentry)
 }
 
 /**
+ *	relayfs_remove_file - remove a file from relay filesystem
+ *	@dentry: directory dentry
+ *
+ *	Returns 0 if successful, negative otherwise.
+ */
+int relayfs_remove_file(struct dentry *dentry)
+{
+	return relayfs_remove(dentry);
+}
+
+/**
  *	relayfs_remove_dir - remove a directory in the relay filesystem
  *	@dentry: directory dentry
  *
@@ -236,45 +247,45 @@ int relayfs_remove_dir(struct dentry *dentry)
 }
 
 /**
- *	relayfs_open - open file op for relayfs files
+ *	relay_file_open - open file op for relay files
  *	@inode: the inode
  *	@filp: the file
  *
  *	Increments the channel buffer refcount.
  */
-static int relayfs_open(struct inode *inode, struct file *filp)
+static int relay_file_open(struct inode *inode, struct file *filp)
 {
-	struct rchan_buf *buf = RELAYFS_I(inode)->buf;
+	struct rchan_buf *buf = inode->u.generic_ip;
 	kref_get(&buf->kref);
+	filp->private_data = buf;
 
 	return 0;
 }
 
 /**
- *	relayfs_mmap - mmap file op for relayfs files
+ *	relay_file_mmap - mmap file op for relay files
  *	@filp: the file
  *	@vma: the vma describing what to map
  *
  *	Calls upon relay_mmap_buf to map the file into user space.
  */
-static int relayfs_mmap(struct file *filp, struct vm_area_struct *vma)
+static int relay_file_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct inode *inode = filp->f_dentry->d_inode;
-	return relay_mmap_buf(RELAYFS_I(inode)->buf, vma);
+	struct rchan_buf *buf = filp->private_data;
+	return relay_mmap_buf(buf, vma);
 }
 
 /**
- *	relayfs_poll - poll file op for relayfs files
+ *	relay_file_poll - poll file op for relay files
  *	@filp: the file
  *	@wait: poll table
  *
  *	Poll implemention.
  */
-static unsigned int relayfs_poll(struct file *filp, poll_table *wait)
+static unsigned int relay_file_poll(struct file *filp, poll_table *wait)
 {
 	unsigned int mask = 0;
-	struct inode *inode = filp->f_dentry->d_inode;
-	struct rchan_buf *buf = RELAYFS_I(inode)->buf;
+	struct rchan_buf *buf = filp->private_data;
 
 	if (buf->finalized)
 		return POLLERR;
@@ -289,27 +300,27 @@ static unsigned int relayfs_poll(struct file *filp, poll_table *wait)
 }
 
 /**
- *	relayfs_release - release file op for relayfs files
+ *	relay_file_release - release file op for relay files
  *	@inode: the inode
  *	@filp: the file
  *
  *	Decrements the channel refcount, as the filesystem is
  *	no longer using it.
  */
-static int relayfs_release(struct inode *inode, struct file *filp)
+static int relay_file_release(struct inode *inode, struct file *filp)
 {
-	struct rchan_buf *buf = RELAYFS_I(inode)->buf;
+	struct rchan_buf *buf = filp->private_data;
 	kref_put(&buf->kref, relay_remove_buf);
 
 	return 0;
 }
 
 /**
- *	relayfs_read_consume - update the consumed count for the buffer
+ *	relay_file_read_consume - update the consumed count for the buffer
  */
-static void relayfs_read_consume(struct rchan_buf *buf,
-				 size_t read_pos,
-				 size_t bytes_consumed)
+static void relay_file_read_consume(struct rchan_buf *buf,
+				    size_t read_pos,
+				    size_t bytes_consumed)
 {
 	size_t subbuf_size = buf->chan->subbuf_size;
 	size_t n_subbufs = buf->chan->n_subbufs;
@@ -332,9 +343,9 @@ static void relayfs_read_consume(struct rchan_buf *buf,
 }
 
 /**
- *	relayfs_read_avail - boolean, are there unconsumed bytes available?
+ *	relay_file_read_avail - boolean, are there unconsumed bytes available?
  */
-static int relayfs_read_avail(struct rchan_buf *buf, size_t read_pos)
+static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
 {
 	size_t bytes_produced, bytes_consumed, write_offset;
 	size_t subbuf_size = buf->chan->subbuf_size;
@@ -365,16 +376,16 @@ static int relayfs_read_avail(struct rchan_buf *buf, size_t read_pos)
 	if (bytes_produced == bytes_consumed)
 		return 0;
 
-	relayfs_read_consume(buf, read_pos, 0);
+	relay_file_read_consume(buf, read_pos, 0);
 
 	return 1;
 }
 
 /**
- *	relayfs_read_subbuf_avail - return bytes available in sub-buffer
+ *	relay_file_read_subbuf_avail - return bytes available in sub-buffer
  */
-static size_t relayfs_read_subbuf_avail(size_t read_pos,
-					struct rchan_buf *buf)
+static size_t relay_file_read_subbuf_avail(size_t read_pos,
+					   struct rchan_buf *buf)
 {
 	size_t padding, avail = 0;
 	size_t read_subbuf, read_offset, write_subbuf, write_offset;
@@ -396,14 +407,14 @@ static size_t relayfs_read_subbuf_avail(size_t read_pos,
 }
 
 /**
- *	relayfs_read_start_pos - find the first available byte to read
+ *	relay_file_read_start_pos - find the first available byte to read
  *
  *	If the read_pos is in the middle of padding, return the
  *	position of the first actually available byte, otherwise
  *	return the original value.
  */
-static size_t relayfs_read_start_pos(size_t read_pos,
-				     struct rchan_buf *buf)
+static size_t relay_file_read_start_pos(size_t read_pos,
+					struct rchan_buf *buf)
 {
 	size_t read_subbuf, padding, padding_start, padding_end;
 	size_t subbuf_size = buf->chan->subbuf_size;
@@ -422,11 +433,11 @@ static size_t relayfs_read_start_pos(size_t read_pos,
 }
 
 /**
- *	relayfs_read_end_pos - return the new read position
+ *	relay_file_read_end_pos - return the new read position
  */
-static size_t relayfs_read_end_pos(struct rchan_buf *buf,
-				   size_t read_pos,
-				   size_t count)
+static size_t relay_file_read_end_pos(struct rchan_buf *buf,
+				      size_t read_pos,
+				      size_t count)
 {
 	size_t read_subbuf, padding, end_pos;
 	size_t subbuf_size = buf->chan->subbuf_size;
@@ -445,7 +456,7 @@ static size_t relayfs_read_end_pos(struct rchan_buf *buf,
 }
 
 /**
- *	relayfs_read - read file op for relayfs files
+ *	relay_file_read - read file op for relay files
  *	@filp: the file
  *	@buffer: the userspace buffer
  *	@count: number of bytes to read
@@ -454,23 +465,23 @@ static size_t relayfs_read_end_pos(struct rchan_buf *buf,
  *	Reads count bytes or the number of bytes available in the
  *	current sub-buffer being read, whichever is smaller.
  */
-static ssize_t relayfs_read(struct file *filp,
-			    char __user *buffer,
-			    size_t count,
-			    loff_t *ppos)
+static ssize_t relay_file_read(struct file *filp,
+			       char __user *buffer,
+			       size_t count,
+			       loff_t *ppos)
 {
+	struct rchan_buf *buf = filp->private_data;
 	struct inode *inode = filp->f_dentry->d_inode;
-	struct rchan_buf *buf = RELAYFS_I(inode)->buf;
 	size_t read_start, avail;
 	ssize_t ret = 0;
 	void *from;
 
 	down(&inode->i_sem);
-	if(!relayfs_read_avail(buf, *ppos))
+	if(!relay_file_read_avail(buf, *ppos))
 		goto out;
 
-	read_start = relayfs_read_start_pos(*ppos, buf);
-	avail = relayfs_read_subbuf_avail(read_start, buf);
+	read_start = relay_file_read_start_pos(*ppos, buf);
+	avail = relay_file_read_subbuf_avail(read_start, buf);
 	if (!avail)
 		goto out;
 
@@ -480,58 +491,25 @@ static ssize_t relayfs_read(struct file *filp,
 		ret = -EFAULT;
 		goto out;
 	}
-	relayfs_read_consume(buf, read_start, count);
-	*ppos = relayfs_read_end_pos(buf, read_start, count);
+	relay_file_read_consume(buf, read_start, count);
+	*ppos = relay_file_read_end_pos(buf, read_start, count);
 out:
 	up(&inode->i_sem);
 	return ret;
 }
 
-/**
- *	relayfs alloc_inode() implementation
- */
-static struct inode *relayfs_alloc_inode(struct super_block *sb)
-{
-	struct relayfs_inode_info *p = kmem_cache_alloc(relayfs_inode_cachep, SLAB_KERNEL);
-	if (!p)
-		return NULL;
-	p->buf = NULL;
-
-	return &p->vfs_inode;
-}
-
-/**
- *	relayfs destroy_inode() implementation
- */
-static void relayfs_destroy_inode(struct inode *inode)
-{
-	if (RELAYFS_I(inode)->buf)
-		relay_destroy_buf(RELAYFS_I(inode)->buf);
-
-	kmem_cache_free(relayfs_inode_cachep, RELAYFS_I(inode));
-}
-
-static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
-{
-	struct relayfs_inode_info *i = p;
-	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
-		inode_init_once(&i->vfs_inode);
-}
-
-struct file_operations relayfs_file_operations = {
-	.open		= relayfs_open,
-	.poll		= relayfs_poll,
-	.mmap		= relayfs_mmap,
-	.read		= relayfs_read,
+struct file_operations relay_file_operations = {
+	.open		= relay_file_open,
+	.poll		= relay_file_poll,
+	.mmap		= relay_file_mmap,
+	.read		= relay_file_read,
 	.llseek		= no_llseek,
-	.release	= relayfs_release,
+	.release	= relay_file_release,
 };
 
 static struct super_operations relayfs_ops = {
 	.statfs		= simple_statfs,
 	.drop_inode	= generic_delete_inode,
-	.alloc_inode	= relayfs_alloc_inode,
-	.destroy_inode	= relayfs_destroy_inode,
 };
 
 static int relayfs_fill_super(struct super_block * sb, void * data, int silent)
@@ -544,7 +522,7 @@ static int relayfs_fill_super(struct super_block * sb, void * data, int silent)
 	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 	sb->s_magic = RELAYFS_MAGIC;
 	sb->s_op = &relayfs_ops;
-	inode = relayfs_get_inode(sb, mode, NULL);
+	inode = relayfs_get_inode(sb, mode, NULL, NULL);
 
 	if (!inode)
 		return -ENOMEM;
@@ -575,33 +553,27 @@ static struct file_system_type relayfs_fs_type = {
 
 static int __init init_relayfs_fs(void)
 {
-	int err;
-
-	relayfs_inode_cachep = kmem_cache_create("relayfs_inode_cache",
-				sizeof(struct relayfs_inode_info), 0,
-				0, init_once, NULL);
-	if (!relayfs_inode_cachep)
-		return -ENOMEM;
-
-	err = register_filesystem(&relayfs_fs_type);
-	if (err)
-		kmem_cache_destroy(relayfs_inode_cachep);
-
-	return err;
+	return register_filesystem(&relayfs_fs_type);
 }
 
 static void __exit exit_relayfs_fs(void)
 {
+
+
+
+
+
 	unregister_filesystem(&relayfs_fs_type);
-	kmem_cache_destroy(relayfs_inode_cachep);
 }
 
 module_init(init_relayfs_fs)
 module_exit(exit_relayfs_fs)
 
-EXPORT_SYMBOL_GPL(relayfs_file_operations);
+EXPORT_SYMBOL_GPL(relay_file_operations);
 EXPORT_SYMBOL_GPL(relayfs_create_dir);
 EXPORT_SYMBOL_GPL(relayfs_remove_dir);
+EXPORT_SYMBOL_GPL(relayfs_create_file);
+EXPORT_SYMBOL_GPL(relayfs_remove_file);
 
 MODULE_AUTHOR("Tom Zanussi <zanussi@us.ibm.com> and Karim Yaghmour <karim@opersys.com>");
 MODULE_DESCRIPTION("Relay Filesystem");
diff --git a/fs/relayfs/relay.c b/fs/relayfs/relay.c
index 2a6f7f12b7f945..abf3ceaace4916 100644
--- a/fs/relayfs/relay.c
+++ b/fs/relayfs/relay.c
@@ -80,11 +80,34 @@ static void buf_unmapped_default_callback(struct rchan_buf *buf,
 {
 }
 
+/*
+ * create_buf_file_create() default callback.  Creates file to represent buf.
+ */
+static struct dentry *create_buf_file_default_callback(const char *filename,
+						       struct dentry *parent,
+						       int mode,
+						       struct rchan_buf *buf,
+						       int *is_global)
+{
+	return relayfs_create_file(filename, parent, mode,
+				   &relay_file_operations, buf);
+}
+
+/*
+ * remove_buf_file() default callback.  Removes file representing relay buffer.
+ */
+static int remove_buf_file_default_callback(struct dentry *dentry)
+{
+	return relayfs_remove(dentry);
+}
+
 /* relay channel default callbacks */
 static struct rchan_callbacks default_channel_callbacks = {
 	.subbuf_start = subbuf_start_default_callback,
 	.buf_mapped = buf_mapped_default_callback,
 	.buf_unmapped = buf_unmapped_default_callback,
+	.create_buf_file = create_buf_file_default_callback,
+	.remove_buf_file = remove_buf_file_default_callback,
 };
 
 /**
@@ -148,14 +171,16 @@ static inline void __relay_reset(struct rchan_buf *buf, unsigned int init)
 void relay_reset(struct rchan *chan)
 {
 	unsigned int i;
+	struct rchan_buf *prev = NULL;
 
 	if (!chan)
 		return;
 
 	for (i = 0; i < NR_CPUS; i++) {
-		if (!chan->buf[i])
-			continue;
+		if (!chan->buf[i] || chan->buf[i] == prev)
+			break;
 		__relay_reset(chan->buf[i], 0);
+		prev = chan->buf[i];
 	}
 }
 
@@ -166,17 +191,27 @@ void relay_reset(struct rchan *chan)
  */
 static struct rchan_buf *relay_open_buf(struct rchan *chan,
 					const char *filename,
-					struct dentry *parent)
+					struct dentry *parent,
+					int *is_global)
 {
 	struct rchan_buf *buf;
 	struct dentry *dentry;
 
+	if (*is_global)
+		return chan->buf[0];
+
+ 	buf = relay_create_buf(chan);
+ 	if (!buf)
+ 		return NULL;
+
 	/* Create file in fs */
-	dentry = relayfs_create_file(filename, parent, S_IRUSR, chan);
-	if (!dentry)
+ 	dentry = chan->cb->create_buf_file(filename, parent, S_IRUSR,
+ 					   buf, is_global);
+ 	if (!dentry) {
+ 		relay_destroy_buf(buf);
 		return NULL;
+ 	}
 
-	buf = RELAYFS_I(dentry->d_inode)->buf;
 	buf->dentry = dentry;
 	__relay_reset(buf, 1);
 
@@ -214,6 +249,10 @@ static inline void setup_callbacks(struct rchan *chan,
 		cb->buf_mapped = buf_mapped_default_callback;
 	if (!cb->buf_unmapped)
 		cb->buf_unmapped = buf_unmapped_default_callback;
+	if (!cb->create_buf_file)
+		cb->create_buf_file = create_buf_file_default_callback;
+	if (!cb->remove_buf_file)
+		cb->remove_buf_file = remove_buf_file_default_callback;
 	chan->cb = cb;
 }
 
@@ -241,6 +280,7 @@ struct rchan *relay_open(const char *base_filename,
 	unsigned int i;
 	struct rchan *chan;
 	char *tmpname;
+	int is_global = 0;
 
 	if (!base_filename)
 		return NULL;
@@ -265,7 +305,8 @@ struct rchan *relay_open(const char *base_filename,
 
 	for_each_online_cpu(i) {
 		sprintf(tmpname, "%s%d", base_filename, i);
-		chan->buf[i] = relay_open_buf(chan, tmpname, parent);
+		chan->buf[i] = relay_open_buf(chan, tmpname, parent,
+					      &is_global);
 		chan->buf[i]->cpu = i;
 		if (!chan->buf[i])
 			goto free_bufs;
@@ -279,6 +320,8 @@ free_bufs:
 		if (!chan->buf[i])
 			break;
 		relay_close_buf(chan->buf[i]);
+		if (is_global)
+			break;
 	}
 	kfree(tmpname);
 
@@ -388,14 +431,16 @@ void relay_destroy_channel(struct kref *kref)
 void relay_close(struct rchan *chan)
 {
 	unsigned int i;
+	struct rchan_buf *prev = NULL;
 
 	if (!chan)
 		return;
 
 	for (i = 0; i < NR_CPUS; i++) {
-		if (!chan->buf[i])
-			continue;
+		if (!chan->buf[i] || chan->buf[i] == prev)
+			break;
 		relay_close_buf(chan->buf[i]);
+		prev = chan->buf[i];
 	}
 
 	if (chan->last_toobig)
@@ -415,14 +460,16 @@ void relay_close(struct rchan *chan)
 void relay_flush(struct rchan *chan)
 {
 	unsigned int i;
+	struct rchan_buf *prev = NULL;
 
 	if (!chan)
 		return;
 
 	for (i = 0; i < NR_CPUS; i++) {
-		if (!chan->buf[i])
-			continue;
+		if (!chan->buf[i] || chan->buf[i] == prev)
+			break;
 		relay_switch_subbuf(chan->buf[i], 0);
+		prev = chan->buf[i];
 	}
 }
 
diff --git a/fs/relayfs/relay.h b/fs/relayfs/relay.h
index 703503fa22b6f3..0993d3e5753b59 100644
--- a/fs/relayfs/relay.h
+++ b/fs/relayfs/relay.h
@@ -1,10 +1,6 @@
 #ifndef _RELAY_H
 #define _RELAY_H
 
-struct dentry *relayfs_create_file(const char *name,
-				   struct dentry *parent,
-				   int mode,
-				   struct rchan *chan);
 extern int relayfs_remove(struct dentry *dentry);
 extern int relay_buf_empty(struct rchan_buf *buf);
 extern void relay_destroy_channel(struct kref *kref);
diff --git a/fs/romfs/inode.c b/fs/romfs/inode.c
index c74f382dabba27..0a13859fd57bc0 100644
--- a/fs/romfs/inode.c
+++ b/fs/romfs/inode.c
@@ -418,7 +418,7 @@ static int
 romfs_readpage(struct file *file, struct page * page)
 {
 	struct inode *inode = page->mapping->host;
-	unsigned long offset, avail, readlen;
+	loff_t offset, avail, readlen;
 	void *buf;
 	int result = -EIO;
 
@@ -429,8 +429,8 @@ romfs_readpage(struct file *file, struct page * page)
 		goto err_out;
 
 	/* 32 bit warning -- but not for us :) */
-	offset = page->index << PAGE_CACHE_SHIFT;
-	if (offset < inode->i_size) {
+	offset = page_offset(page);
+	if (offset < i_size_read(inode)) {
 		avail = inode->i_size-offset;
 		readlen = min_t(unsigned long, avail, PAGE_SIZE);
 		if (romfs_copyfrom(inode, buf, ROMFS_I(inode)->i_dataoffset+offset, readlen) == readlen) {
diff --git a/fs/smbfs/cache.c b/fs/smbfs/cache.c
index f3e6b81288abf4..74b86d9725a63c 100644
--- a/fs/smbfs/cache.c
+++ b/fs/smbfs/cache.c
@@ -66,7 +66,7 @@ smb_invalidate_dircache_entries(struct dentry *parent)
 	spin_lock(&dcache_lock);
 	next = parent->d_subdirs.next;
 	while (next != &parent->d_subdirs) {
-		dentry = list_entry(next, struct dentry, d_child);
+		dentry = list_entry(next, struct dentry, d_u.d_child);
 		dentry->d_fsdata = NULL;
 		smb_age_dentry(server, dentry);
 		next = next->next;
@@ -100,7 +100,7 @@ smb_dget_fpos(struct dentry *dentry, struct dentry *parent, unsigned long fpos)
 	spin_lock(&dcache_lock);
 	next = parent->d_subdirs.next;
 	while (next != &parent->d_subdirs) {
-		dent = list_entry(next, struct dentry, d_child);
+		dent = list_entry(next, struct dentry, d_u.d_child);
 		if ((unsigned long)dent->d_fsdata == fpos) {
 			if (dent->d_inode)
 				dget_locked(dent);
diff --git a/fs/smbfs/file.c b/fs/smbfs/file.c
index b4fcfa8b55a149..7042e62726a419 100644
--- a/fs/smbfs/file.c
+++ b/fs/smbfs/file.c
@@ -209,8 +209,8 @@ smb_updatepage(struct file *file, struct page *page, unsigned long offset,
 {
 	struct dentry *dentry = file->f_dentry;
 
-	DEBUG1("(%s/%s %d@%ld)\n", DENTRY_PATH(dentry), 
-	       count, (page->index << PAGE_CACHE_SHIFT)+offset);
+	DEBUG1("(%s/%s %d@%lld)\n", DENTRY_PATH(dentry), count,
+		((unsigned long long)page->index << PAGE_CACHE_SHIFT) + offset);
 
 	return smb_writepage_sync(dentry->d_inode, page, offset, count);
 }
@@ -374,8 +374,7 @@ smb_file_release(struct inode *inode, struct file * file)
 		/* We must flush any dirty pages now as we won't be able to
 		   write anything after close. mmap can trigger this.
 		   "openers" should perhaps include mmap'ers ... */
-		filemap_fdatawrite(inode->i_mapping);
-		filemap_fdatawait(inode->i_mapping);
+		filemap_write_and_wait(inode->i_mapping);
 		smb_close(inode);
 	}
 	unlock_kernel();
diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c
index 10b994428fef29..6ec88bf59b2def 100644
--- a/fs/smbfs/inode.c
+++ b/fs/smbfs/inode.c
@@ -697,8 +697,7 @@ smb_notify_change(struct dentry *dentry, struct iattr *attr)
 			DENTRY_PATH(dentry),
 			(long) inode->i_size, (long) attr->ia_size);
 
-		filemap_fdatawrite(inode->i_mapping);
-		filemap_fdatawait(inode->i_mapping);
+		filemap_write_and_wait(inode->i_mapping);
 
 		error = smb_open(dentry, O_WRONLY);
 		if (error)
diff --git a/fs/smbfs/proc.c b/fs/smbfs/proc.c
index 38ab558835c4ba..d6baec0f24ad5f 100644
--- a/fs/smbfs/proc.c
+++ b/fs/smbfs/proc.c
@@ -3113,7 +3113,7 @@ smb_proc_setattr_unix(struct dentry *d, struct iattr *attr,
 	LSET(data, 32, SMB_TIME_NO_CHANGE);
 	LSET(data, 40, SMB_UID_NO_CHANGE);
 	LSET(data, 48, SMB_GID_NO_CHANGE);
-	LSET(data, 56, smb_filetype_from_mode(attr->ia_mode));
+	DSET(data, 56, smb_filetype_from_mode(attr->ia_mode));
 	LSET(data, 60, major);
 	LSET(data, 68, minor);
 	LSET(data, 76, 0);
diff --git a/fs/super.c b/fs/super.c
index 5a347a4f673a4a..0a30e51692cf69 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -700,8 +700,7 @@ struct super_block *get_sb_bdev(struct file_system_type *fs_type,
 
 		s->s_flags = flags;
 		strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
-		s->s_old_blocksize = block_size(bdev);
-		sb_set_blocksize(s, s->s_old_blocksize);
+		sb_set_blocksize(s, block_size(bdev));
 		error = fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
 		if (error) {
 			up_write(&s->s_umount);
diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c
index 69a085abad6f8b..cce8b05cba5a03 100644
--- a/fs/sysv/dir.c
+++ b/fs/sysv/dir.c
@@ -103,7 +103,7 @@ static int sysv_readdir(struct file * filp, void * dirent, filldir_t filldir)
 			offset = (char *)de - kaddr;
 
 			over = filldir(dirent, name, strnlen(name,SYSV_NAMELEN),
-					(n<<PAGE_CACHE_SHIFT) | offset,
+					((loff_t)n<<PAGE_CACHE_SHIFT) | offset,
 					fs16_to_cpu(SYSV_SB(sb), de->inode),
 					DT_UNKNOWN);
 			if (over) {
@@ -115,7 +115,7 @@ static int sysv_readdir(struct file * filp, void * dirent, filldir_t filldir)
 	}
 
 done:
-	filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
+	filp->f_pos = ((loff_t)n << PAGE_CACHE_SHIFT) | offset;
 	unlock_kernel();
 	return 0;
 }
diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c
index 6598a5037ac80c..4fae57d9d11510 100644
--- a/fs/udf/balloc.c
+++ b/fs/udf/balloc.c
@@ -41,7 +41,7 @@
 #define uint(x) xuint(x)
 #define xuint(x) __le ## x
 
-extern inline int find_next_one_bit (void * addr, int size, int offset)
+static inline int find_next_one_bit (void * addr, int size, int offset)
 {
 	uintBPL_t * p = ((uintBPL_t *) addr) + (offset / BITS_PER_LONG);
 	int result = offset & ~(BITS_PER_LONG-1);
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 4014f17d382e70..395e582ee5425c 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1957,11 +1957,6 @@ int8_t inode_bmap(struct inode *inode, int block, kernel_lb_addr *bloc, uint32_t
 		printk(KERN_ERR "udf: inode_bmap: block < 0\n");
 		return -1;
 	}
-	if (!inode)
-	{
-		printk(KERN_ERR "udf: inode_bmap: NULL inode\n");
-		return -1;
-	}
 
 	*extoffset = 0;
 	*elen = 0;
diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 54828ebcf1bacd..2ba11a9aa99596 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -1296,8 +1296,10 @@ static ssize_t ufs_quota_write(struct super_block *sb, int type,
 		blk++;
 	}
 out:
-	if (len == towrite)
+	if (len == towrite) {
+		up(&inode->i_sem);
 		return err;
+	}
 	if (inode->i_size < off+len-towrite)
 		i_size_write(inode, off+len-towrite);
 	inode->i_version++;
diff --git a/fs/xfs/linux-2.6/xfs_fs_subr.c b/fs/xfs/linux-2.6/xfs_fs_subr.c
index f89340c61bf289..4fa4b1a5187e09 100644
--- a/fs/xfs/linux-2.6/xfs_fs_subr.c
+++ b/fs/xfs/linux-2.6/xfs_fs_subr.c
@@ -79,8 +79,7 @@ fs_flushinval_pages(
 	struct inode	*ip = LINVFS_GET_IP(vp);
 
 	if (VN_CACHED(vp)) {
-		filemap_fdatawrite(ip->i_mapping);
-		filemap_fdatawait(ip->i_mapping);
+		filemap_write_and_wait(ip->i_mapping);
 
 		truncate_inode_pages(ip->i_mapping, first);
 	}
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
index 158829ca56f699..f40d4391fcfcc0 100644
--- a/fs/xfs/xfs_log.h
+++ b/fs/xfs/xfs_log.h
@@ -30,13 +30,7 @@
  * By comparing each compnent, we don't have to worry about extra
  * endian issues in treating two 32 bit numbers as one 64 bit number
  */
-static
-#if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
-__attribute__((unused))	/* gcc 2.95, 2.96 miscompile this when inlined */
-#else
-__inline__
-#endif
-xfs_lsn_t	_lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
+static inline xfs_lsn_t	_lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
 {
 	if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
 		return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;