From 5d556ec213d6dd5814c734c3a53c2e5282719052 Mon Sep 17 00:00:00 2001
From: David Chinner <dgc@sgi.com>
Date: Wed, 10 Jan 2007 23:15:41 -0800
Subject: [PATCH] --- yaml --- r: 45481 b: refs/heads/master c:
 f73ca1b76c6880b934d3ef566c1592efc80bb759 h: refs/heads/master i:   45479:
 5978d0f05de0127c6b7b7231ff83d95589902fab v: v3

---
 [refs]                     | 2 +-
 trunk/fs/block_dev.c       | 2 +-
 trunk/fs/buffer.c          | 6 +++---
 trunk/fs/gfs2/ops_fstype.c | 4 ++--
 trunk/fs/super.c           | 4 ++--
 trunk/include/linux/fs.h   | 2 +-
 6 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/[refs] b/[refs]
index 4aa3f774d703..6e847af73371 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 88bf7b391dca840f03fe25e4ff8fe6b4319fa07b
+refs/heads/master: f73ca1b76c6880b934d3ef566c1592efc80bb759
diff --git a/trunk/fs/block_dev.c b/trunk/fs/block_dev.c
index 1715d6b5f411..8b18e43b82fe 100644
--- a/trunk/fs/block_dev.c
+++ b/trunk/fs/block_dev.c
@@ -411,7 +411,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 	{
 		memset(bdev, 0, sizeof(*bdev));
 		mutex_init(&bdev->bd_mutex);
-		mutex_init(&bdev->bd_mount_mutex);
+		sema_init(&bdev->bd_mount_sem, 1);
 		INIT_LIST_HEAD(&bdev->bd_inodes);
 		INIT_LIST_HEAD(&bdev->bd_list);
 #ifdef CONFIG_SYSFS
diff --git a/trunk/fs/buffer.c b/trunk/fs/buffer.c
index 263f88e4dffb..3b116078b4c3 100644
--- a/trunk/fs/buffer.c
+++ b/trunk/fs/buffer.c
@@ -180,7 +180,7 @@ int fsync_bdev(struct block_device *bdev)
  * freeze_bdev  --  lock a filesystem and force it into a consistent state
  * @bdev:	blockdevice to lock
  *
- * This takes the block device bd_mount_mutex to make sure no new mounts
+ * This takes the block device bd_mount_sem to make sure no new mounts
  * happen on bdev until thaw_bdev() is called.
  * If a superblock is found on this device, we take the s_umount semaphore
  * on it to make sure nobody unmounts until the snapshot creation is done.
@@ -189,7 +189,7 @@ struct super_block *freeze_bdev(struct block_device *bdev)
 {
 	struct super_block *sb;
 
-	mutex_lock(&bdev->bd_mount_mutex);
+	down(&bdev->bd_mount_sem);
 	sb = get_super(bdev);
 	if (sb && !(sb->s_flags & MS_RDONLY)) {
 		sb->s_frozen = SB_FREEZE_WRITE;
@@ -231,7 +231,7 @@ void thaw_bdev(struct block_device *bdev, struct super_block *sb)
 		drop_super(sb);
 	}
 
-	mutex_unlock(&bdev->bd_mount_mutex);
+	up(&bdev->bd_mount_sem);
 }
 EXPORT_SYMBOL(thaw_bdev);
 
diff --git a/trunk/fs/gfs2/ops_fstype.c b/trunk/fs/gfs2/ops_fstype.c
index d14e139d2674..ee80b8a5e7bc 100644
--- a/trunk/fs/gfs2/ops_fstype.c
+++ b/trunk/fs/gfs2/ops_fstype.c
@@ -867,9 +867,9 @@ static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 		error = -EBUSY;
 		goto error;
 	}
-	mutex_lock(&sb->s_bdev->bd_mount_mutex);
+	down(&sb->s_bdev->bd_mount_sem);
 	new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
-	mutex_unlock(&sb->s_bdev->bd_mount_mutex);
+	up(&sb->s_bdev->bd_mount_sem);
 	if (IS_ERR(new)) {
 		error = PTR_ERR(new);
 		goto error;
diff --git a/trunk/fs/super.c b/trunk/fs/super.c
index f961e0307997..3e7458c2bb76 100644
--- a/trunk/fs/super.c
+++ b/trunk/fs/super.c
@@ -753,9 +753,9 @@ int get_sb_bdev(struct file_system_type *fs_type,
 	 * will protect the lockfs code from trying to start a snapshot
 	 * while we are mounting
 	 */
-	mutex_lock(&bdev->bd_mount_mutex);
+	down(&bdev->bd_mount_sem);
 	s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
-	mutex_unlock(&bdev->bd_mount_mutex);
+	up(&bdev->bd_mount_sem);
 	if (IS_ERR(s))
 		goto error_s;
 
diff --git a/trunk/include/linux/fs.h b/trunk/include/linux/fs.h
index 14a337cc3464..1410e5330c8d 100644
--- a/trunk/include/linux/fs.h
+++ b/trunk/include/linux/fs.h
@@ -459,7 +459,7 @@ struct block_device {
 	struct inode *		bd_inode;	/* will die */
 	int			bd_openers;
 	struct mutex		bd_mutex;	/* open/close mutex */
-	struct mutex		bd_mount_mutex;	/* mount mutex */
+	struct semaphore	bd_mount_sem;
 	struct list_head	bd_inodes;
 	void *			bd_holder;
 	int			bd_holders;