diff -u --recursive --new-file linux-2.4.17-cto/fs/nfs/dir.c linux-2.4.17-rdplus/fs/nfs/dir.c
--- linux-2.4.17-cto/fs/nfs/dir.c	Tue Dec 11 00:20:27 2001
+++ linux-2.4.17-rdplus/fs/nfs/dir.c	Tue Dec 11 00:20:52 2001
@@ -37,6 +37,8 @@
 static loff_t nfs_dir_llseek(struct file *, loff_t, int);
 static int nfs_readdir(struct file *, void *, filldir_t);
 static struct dentry *nfs_lookup(struct inode *, struct dentry *);
+static int nfs_cached_lookup(struct inode *, struct dentry *,
+				struct nfs_fh *, struct nfs_fattr *);
 static int nfs_create(struct inode *, struct dentry *, int);
 static int nfs_mkdir(struct inode *, struct dentry *, int);
 static int nfs_rmdir(struct inode *, struct dentry *);
@@ -130,13 +132,15 @@
 	error = NFS_PROTO(inode)->readdir(inode, cred, desc->entry->cookie, buffer,
 					  NFS_SERVER(inode)->dtsize, desc->plus);
 	/* We requested READDIRPLUS, but the server doesn't grok it */
-	if (desc->plus && error == -ENOTSUPP) {
-		NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS;
-		desc->plus = 0;
-		goto again;
-	}
-	if (error < 0)
+	if (error < 0) {
+		if (error == -ENOTSUPP && desc->plus) {
+			NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS;
+			NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS;
+			desc->plus = 0;
+			goto again;
+		}
 		goto error;
+	}
 	SetPageUptodate(page);
 	kunmap(page);
 	/* Ensure consistent page alignment of the data.
@@ -217,7 +221,6 @@
 
 	dfprintk(VFS, "NFS: find_dirent_page() searching directory page %ld\n", desc->page_index);
 
-	desc->plus = NFS_USE_READDIRPLUS(inode);
 	page = read_cache_page(&inode->i_data, desc->page_index,
 			       (filler_t *)nfs_readdir_filler, desc);
 	if (IS_ERR(page)) {
@@ -269,6 +272,24 @@
 	return res;
 }
 
+static unsigned int nfs_type2dtype[] = {
+	DT_UNKNOWN,
+	DT_REG,
+	DT_DIR,
+	DT_BLK,
+	DT_CHR,
+	DT_LNK,
+	DT_SOCK,
+	DT_UNKNOWN,
+	DT_FIFO
+};
+
+static inline
+unsigned int nfs_type_to_d_type(enum nfs_ftype type)
+{
+	return nfs_type2dtype[type];
+}
+
 /*
  * Once we've found the start of the dirent within a page: fill 'er up...
  */
@@ -285,11 +306,17 @@
 	dfprintk(VFS, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", (long long)desc->target);
 
 	for(;;) {
+		unsigned d_type = DT_UNKNOWN;
 		/* Note: entry->prev_cookie contains the cookie for
 		 *	 retrieving the current dirent on the server */
 		fileid = nfs_fileid_to_ino_t(entry->ino);
+
+		/* Use readdirplus info */
+		if (desc->plus && (entry->fattr->valid & NFS_ATTR_FATTR))
+			d_type = nfs_type_to_d_type(entry->fattr->type);
+
 		res = filldir(dirent, entry->name, entry->len, 
-			      entry->prev_cookie, fileid, DT_UNKNOWN);
+			      entry->prev_cookie, fileid, d_type);
 		if (res < 0)
 			break;
 		file->f_pos = desc->target = entry->cookie;
@@ -356,7 +383,8 @@
 	/* Reset read descriptor so it searches the page cache from
 	 * the start upon the next call to readdir_search_pagecache() */
 	desc->page_index = 0;
-	memset(desc->entry, 0, sizeof(*desc->entry));
+	desc->entry->cookie = desc->entry->prev_cookie = 0;
+	desc->entry->eof = 0;
  out:
 	dfprintk(VFS, "NFS: uncached_readdir() returns %d\n", status);
 	return status;
@@ -375,9 +403,11 @@
 	nfs_readdir_descriptor_t my_desc,
 			*desc = &my_desc;
 	struct nfs_entry my_entry;
+	struct nfs_fh	fh;
+	struct nfs_fattr fattr;
 	long		res;
 
-	res = nfs_revalidate(dentry);
+	res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
 	if (res < 0)
 		return res;
 
@@ -388,12 +418,16 @@
 	 * itself.
 	 */
 	memset(desc, 0, sizeof(*desc));
-	memset(&my_entry, 0, sizeof(my_entry));
-
 	desc->file = filp;
 	desc->target = filp->f_pos;
-	desc->entry = &my_entry;
 	desc->decode = NFS_PROTO(inode)->decode_dirent;
+	desc->plus = NFS_USE_READDIRPLUS(inode);
+
+	my_entry.cookie = my_entry.prev_cookie = 0;
+	my_entry.eof = 0;
+	my_entry.fh = &fh;
+	my_entry.fattr = &fattr;
+	desc->entry = &my_entry;
 
 	while(!desc->entry->eof) {
 		res = readdir_search_pagecache(desc);
@@ -528,6 +562,15 @@
 		goto out_valid;
 	}
 
+	error = nfs_cached_lookup(dir, dentry, &fhandle, &fattr);
+	if (!error) {
+		if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
+			goto out_bad;
+		if (nfs_lookup_verify_inode(inode, flags))
+			goto out_bad;
+		goto out_valid_renew;
+	}
+
 	if (NFS_STALE(inode))
 		goto out_bad;
 
@@ -539,6 +582,7 @@
 	if ((error = nfs_refresh_inode(inode, &fattr)) != 0)
 		goto out_bad;
 
+ out_valid_renew:
 	nfs_renew_times(dentry);
  out_valid:
 	unlock_kernel();
@@ -612,6 +656,20 @@
 	error = -ENOMEM;
 	dentry->d_op = &nfs_dentry_operations;
 
+	error = nfs_cached_lookup(dir, dentry, &fhandle, &fattr);
+	if (!error) {
+		error = -EACCES;
+		inode = nfs_fhget(dentry, &fhandle, &fattr);
+		if (inode) {
+			if (!(NFS_SERVER(dir)->flags & NFS_MOUNT_NOCTO))
+				NFS_CACHEINV(inode);
+			d_add(dentry, inode);
+			nfs_renew_times(dentry);
+			error = 0;
+		}
+		goto out;
+	}
+
 	error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
 	inode = NULL;
 	if (error == -ENOENT)
@@ -630,6 +688,77 @@
 	return ERR_PTR(error);
 }
 
+static inline
+int find_dirent_name(nfs_readdir_descriptor_t *desc, struct page *page, struct dentry *dentry)
+{
+	struct nfs_entry *entry = desc->entry;
+	int		 status;
+
+	while((status = dir_decode(desc)) == 0) {
+		if (entry->len != dentry->d_name.len)
+			continue;
+		if (memcmp(entry->name, dentry->d_name.name, entry->len))
+			continue;
+		if (!(entry->fattr->valid & NFS_ATTR_FATTR))
+			continue;
+		break;
+	}
+	return status;
+}
+
+/*
+ * Use the cached Readdirplus results in order to avoid a LOOKUP call
+ * whenever we believe that the parent directory has not changed.
+ *
+ * We assume that any file creation/rename changes the directory mtime.
+ * As this results in a page cache invalidation whenever it occurs,
+ * we don't require any other tests for cache coherency.
+ */
+static
+int nfs_cached_lookup(struct inode *dir, struct dentry *dentry,
+			struct nfs_fh *fh, struct nfs_fattr *fattr)
+{
+	nfs_readdir_descriptor_t desc;
+	struct nfs_server *server;
+	struct nfs_entry entry;
+	struct page *page;
+	int res;
+
+	if (!NFS_USE_READDIRPLUS(dir))
+		return -ENOENT;
+	server = NFS_SERVER(dir);
+	if (server->flags & NFS_MOUNT_NOAC)
+		return -ENOENT;
+	nfs_revalidate_inode(server, dir);
+
+	entry.fh = fh;
+	entry.fattr = fattr;
+
+	desc.decode = NFS_PROTO(dir)->decode_dirent;
+	desc.entry = &entry;
+	desc.page_index = 0;
+	desc.plus = 1;
+
+	for(;(page = find_get_page(&dir->i_data, desc.page_index)); desc.page_index++) {
+
+		res = -EIO;
+		if (Page_Uptodate(page)) {
+			desc.ptr = kmap(page);
+			res = find_dirent_name(&desc, page, dentry);
+			kunmap(page);
+		}
+		page_cache_release(page);
+
+		if (res == 0)
+			goto out_found;
+		if (res != -EAGAIN)
+			break;
+	}
+	return -ENOENT;
+ out_found:
+	return 0;
+}
+
 /*
  * Code common to create, mkdir, and mknod.
  */
diff -u --recursive --new-file linux-2.4.17-cto/fs/nfs/inode.c linux-2.4.17-rdplus/fs/nfs/inode.c
--- linux-2.4.17-cto/fs/nfs/inode.c	Tue Dec 11 00:20:27 2001
+++ linux-2.4.17-rdplus/fs/nfs/inode.c	Tue Dec 11 00:24:06 2001
@@ -395,6 +395,7 @@
 #ifdef CONFIG_NFS_V3
 		server->rpc_ops = &nfs_v3_clientops;
 		version = 3;
+		server->caps |= NFS_CAP_READDIRPLUS;
 		if (data->version < 4) {
 			printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n");
 			goto out_unlock;
@@ -631,37 +632,36 @@
 	nfs_zap_caches(inode);
 }
 
+/* Don't use READDIRPLUS on directories that we believe are too large */
+#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
+
 /*
  * Fill in inode information from the fattr.
  */
 static void
 nfs_fill_inode(struct inode *inode, struct nfs_fh *fh, struct nfs_fattr *fattr)
 {
-	/*
-	 * Check whether the mode has been set, as we only want to
-	 * do this once. (We don't allow inodes to change types.)
+	NFS_FILEID(inode) = fattr->fileid;
+	NFS_FSID(inode) = fattr->fsid;
+	inode->i_mode = fattr->mode;
+	/* Why so? Because we want revalidate for devices/FIFOs, and
+	 * that's precisely what we have in nfs_file_inode_operations.
 	 */
-	if (inode->i_mode == 0) {
-		NFS_FILEID(inode) = fattr->fileid;
-		NFS_FSID(inode) = fattr->fsid;
-		inode->i_mode = fattr->mode;
-		/* Why so? Because we want revalidate for devices/FIFOs, and
-		 * that's precisely what we have in nfs_file_inode_operations.
-		 */
-		inode->i_op = &nfs_file_inode_operations;
-		if (S_ISREG(inode->i_mode)) {
-			inode->i_fop = &nfs_file_operations;
-			inode->i_data.a_ops = &nfs_file_aops;
-		} else if (S_ISDIR(inode->i_mode)) {
-			inode->i_op = &nfs_dir_inode_operations;
-			inode->i_fop = &nfs_dir_operations;
-		} else if (S_ISLNK(inode->i_mode))
-			inode->i_op = &nfs_symlink_inode_operations;
-		else
-			init_special_inode(inode, inode->i_mode, fattr->rdev);
-		memcpy(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh));
-	}
-	nfs_refresh_inode(inode, fattr);
+	inode->i_op = &nfs_file_inode_operations;
+	if (S_ISREG(inode->i_mode)) {
+		inode->i_fop = &nfs_file_operations;
+		inode->i_data.a_ops = &nfs_file_aops;
+	} else if (S_ISDIR(inode->i_mode)) {
+		inode->i_op = &nfs_dir_inode_operations;
+		inode->i_fop = &nfs_dir_operations;
+		if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
+		    && fattr->size <= NFS_LIMIT_READDIRPLUS)
+			NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS;
+	} else if (S_ISLNK(inode->i_mode))
+		inode->i_op = &nfs_symlink_inode_operations;
+	else
+		init_special_inode(inode, inode->i_mode, fattr->rdev);
+	memcpy(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh));
 }
 
 struct nfs_find_desc {
@@ -736,7 +736,19 @@
 	if (!(inode = iget4(sb, ino, nfs_find_actor, &desc)))
 		goto out_no_inode;
 
-	nfs_fill_inode(inode, fh, fattr);
+	/*
+	 * Check whether the mode has been set, as we only want to
+	 * do this once. (We don't allow inodes to change types.)
+	 */
+	if (inode->i_mode == 0) {
+		nfs_fill_inode(inode, fh, fattr);
+		nfs_refresh_inode(inode, fattr);
+
+		/* We don't trust READDIRPLUS attributes */
+		if (fattr->valid & NFS_ATTR_RDPLUS)
+			NFS_CACHEINV(inode);
+	} else if (!(fattr->valid & NFS_ATTR_RDPLUS))
+		nfs_refresh_inode(inode, fattr);
 	dprintk("NFS: __nfs_fhget(%x/%Ld ct=%d)\n",
 		inode->i_dev, (long long)NFS_FILEID(inode),
 		atomic_read(&inode->i_count));
diff -u --recursive --new-file linux-2.4.17-cto/fs/nfs/nfs3xdr.c linux-2.4.17-rdplus/fs/nfs/nfs3xdr.c
--- linux-2.4.17-cto/fs/nfs/nfs3xdr.c	Tue Dec 11 00:19:55 2001
+++ linux-2.4.17-rdplus/fs/nfs/nfs3xdr.c	Tue Dec 11 00:20:52 2001
@@ -669,21 +669,21 @@
 	entry->cookie = nfs_transform_cookie64(cookie);
 
 	if (plus) {
-		p = xdr_decode_post_op_attr(p, &entry->fattr);
+		entry->fattr->valid = 0;
+		p = xdr_decode_post_op_attr(p, entry->fattr);
+		if (entry->fattr->valid != 0)
+			entry->fattr->valid |= NFS_ATTR_RDPLUS;
 		/* In fact, a post_op_fh3: */
 		if (*p++) {
-			p = xdr_decode_fhandle(p, &entry->fh);
+			p = xdr_decode_fhandle(p, entry->fh);
 			/* Ugh -- server reply was truncated */
 			if (p == NULL) {
 				dprintk("NFS: FH truncated\n");
 				*entry = old;
 				return ERR_PTR(-EAGAIN);
 			}
-		} else {
-			/* If we don't get a file handle, the attrs
-			 * aren't worth a lot. */
-			entry->fattr.valid = 0;
-		}
+		} else
+			memset((u8*)(entry->fh), 0, sizeof(*entry->fh));
 	}
 
 	entry->eof = !p[0] && p[1];
diff -u --recursive --new-file linux-2.4.17-cto/include/linux/nfs_fs.h linux-2.4.17-rdplus/include/linux/nfs_fs.h
--- linux-2.4.17-cto/include/linux/nfs_fs.h	Tue Dec 11 00:20:27 2001
+++ linux-2.4.17-rdplus/include/linux/nfs_fs.h	Tue Dec 11 00:20:52 2001
@@ -102,8 +102,15 @@
 #define NFS_FILEID(inode)		((inode)->u.nfs_i.fileid)
 #define NFS_FSID(inode)			((inode)->u.nfs_i.fsid)
 
-/* Inode Flags */
-#define NFS_USE_READDIRPLUS(inode)	((NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS) ? 1 : 0)
+static inline int nfs_server_capable(struct inode *inode, int cap)
+{
+	return NFS_SERVER(inode)->caps & cap;
+}
+
+static inline int NFS_USE_READDIRPLUS(struct inode *inode)
+{
+	return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
+}
 
 /*
  * These are the default flags for swap requests
diff -u --recursive --new-file linux-2.4.17-cto/include/linux/nfs_fs_sb.h linux-2.4.17-rdplus/include/linux/nfs_fs_sb.h
--- linux-2.4.17-cto/include/linux/nfs_fs_sb.h	Sat Dec  8 17:42:36 2001
+++ linux-2.4.17-rdplus/include/linux/nfs_fs_sb.h	Tue Dec 11 00:20:52 2001
@@ -10,6 +10,7 @@
 	struct rpc_clnt *	client;		/* RPC client handle */
 	struct nfs_rpc_ops *	rpc_ops;	/* NFS protocol vector */
 	int			flags;		/* various flags */
+	unsigned int		caps;		/* server capabilities */
 	unsigned int		rsize;		/* read size */
 	unsigned int		rpages;		/* read size (in pages) */
 	unsigned int		wsize;		/* write size */
@@ -36,4 +37,8 @@
 	struct nfs_server	s_server;
 };
 
+/* Server capabilities */
+#define NFS_CAP_READDIRPLUS	1
+
+
 #endif
diff -u --recursive --new-file linux-2.4.17-cto/include/linux/nfs_xdr.h linux-2.4.17-rdplus/include/linux/nfs_xdr.h
--- linux-2.4.17-cto/include/linux/nfs_xdr.h	Tue Dec 11 00:19:23 2001
+++ linux-2.4.17-rdplus/include/linux/nfs_xdr.h	Tue Dec 11 00:20:52 2001
@@ -35,6 +35,7 @@
 #define NFS_ATTR_WCC		0x0001		/* pre-op WCC data    */
 #define NFS_ATTR_FATTR		0x0002		/* post-op attributes */
 #define NFS_ATTR_FATTR_V3	0x0004		/* NFSv3 attributes */
+#define NFS_ATTR_RDPLUS		0x0008		/* Made in readdirplus */
 
 /*
  * Info on the file system
@@ -135,8 +136,8 @@
 	const char *		name;
 	unsigned int		len;
 	int			eof;
-	struct nfs_fh		fh;
-	struct nfs_fattr	fattr;
+	struct nfs_fh		*fh;
+	struct nfs_fattr	*fattr;
 };
 
 /*