Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull misc VFS updates from Al Viro:
 "This cycle a lot of stuff sits on topical branches, so I'll be sending
  more or less one pull request per branch.

  This is the first pile; more to follow in a few.  In this one are
  several misc commits from early in the cycle (before I went for
  separate branches), plus the rework of mntput/dput ordering on umount,
  switching to use of fs_pin instead of convoluted games in
  namespace_unlock()"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  switch the IO-triggering parts of umount to fs_pin
  new fs_pin killing logics
  allow attaching fs_pin to a group not associated with some superblock
  get rid of the second argument of acct_kill()
  take count and rcu_head out of fs_pin
  dcache: let the dentry count go down to zero without taking d_lock
  pull bumping refcount into ->kill()
  kill pin_put()
  mode_t whack-a-mole: chelsio
  file->f_path.dentry is pinned down for as long as the file is open...
  get rid of lustre_dump_dentry()
  gut proc_register() a bit
  kill d_validate()
  ncpfs: get rid of d_validate() nonsense
  selinuxfs: don't open-code d_genocide()

4 files changed, 19 insertions, 16 deletions

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 5a813988e6d473..92c08cf7670e2a 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -319,9 +319,6 @@ static inline unsigned d_count(const struct dentry *dentry)
 	return dentry->d_lockref.count;
 }
 
-/* validate "insecure" dentry pointer */
-extern int d_validate(struct dentry *, struct dentry *);
-
 /*
  * helper function for dentry_operations.d_dname() members
  */
diff --git a/include/linux/fs_pin.h b/include/linux/fs_pin.h
index f66525e72ccf1a..9dc4e0384bfb7a 100644
--- a/include/linux/fs_pin.h
+++ b/include/linux/fs_pin.h
@@ -1,17 +1,22 @@
-#include <linux/fs.h>
+#include <linux/wait.h>
 
 struct fs_pin {
-	atomic_long_t		count;
-	union {
-		struct {
-			struct hlist_node	s_list;
-			struct hlist_node	m_list;
-		};
-		struct rcu_head rcu;
-	};
+	wait_queue_head_t	wait;
+	int			done;
+	struct hlist_node	s_list;
+	struct hlist_node	m_list;
 	void (*kill)(struct fs_pin *);
 };
 
-void pin_put(struct fs_pin *);
+struct vfsmount;
+
+static inline void init_fs_pin(struct fs_pin *p, void (*kill)(struct fs_pin *))
+{
+	init_waitqueue_head(&p->wait);
+	p->kill = kill;
+}
+
 void pin_remove(struct fs_pin *);
+void pin_insert_group(struct fs_pin *, struct vfsmount *, struct hlist_head *);
 void pin_insert(struct fs_pin *, struct vfsmount *);
+void pin_kill(struct fs_pin *);
diff --git a/include/linux/lockref.h b/include/linux/lockref.h
index 4bfde0e99ed516..b10b122dd09989 100644
--- a/include/linux/lockref.h
+++ b/include/linux/lockref.h
@@ -28,12 +28,13 @@ struct lockref {
 #endif
 		struct {
 			spinlock_t lock;
-			unsigned int count;
+			int count;
 		};
 	};
 };
 
 extern void lockref_get(struct lockref *);
+extern int lockref_put_return(struct lockref *);
 extern int lockref_get_not_zero(struct lockref *);
 extern int lockref_get_or_lock(struct lockref *);
 extern int lockref_put_or_lock(struct lockref *);
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index b9cf6c51b18106..918b117a7cd303 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -19,7 +19,7 @@ struct pidmap {
 #define BITS_PER_PAGE_MASK	(BITS_PER_PAGE-1)
 #define PIDMAP_ENTRIES		((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
 
-struct bsd_acct_struct;
+struct fs_pin;
 
 struct pid_namespace {
 	struct kref kref;
@@ -37,7 +37,7 @@ struct pid_namespace {
 	struct dentry *proc_thread_self;
 #endif
 #ifdef CONFIG_BSD_PROCESS_ACCT
-	struct bsd_acct_struct *bacct;
+	struct fs_pin *bacct;
 #endif
 	struct user_namespace *user_ns;
 	struct work_struct proc_work;