UBUNTU: Start new release

[linux-flexiantxendom0-natty.git] / fs / super.c

diff --git a/fs/super.c b/fs/super.c
index 968ba01..0d89e93 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -71,6 +71,7 @@ static struct super_block *alloc_super(struct file_system_type *type)
 #else
                INIT_LIST_HEAD(&s->s_files);
 #endif
+               s->s_bdi = &default_backing_dev_info;
                INIT_LIST_HEAD(&s->s_instances);
                INIT_HLIST_BL_HEAD(&s->s_anon);
                INIT_LIST_HEAD(&s->s_inodes);
@@ -177,6 +178,11 @@ void deactivate_locked_super(struct super_block *s)
        struct file_system_type *fs = s->s_type;
        if (atomic_dec_and_test(&s->s_active)) {
                fs->kill_sb(s);
+               /*
+                * We need to call rcu_barrier so all the delayed rcu free
+                * inodes are flushed before we release the fs module.
+                */
+               rcu_barrier();
                put_filesystem(fs);
                put_super(s);
        } else {
@@ -767,13 +773,13 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
 {
        struct block_device *bdev;
        struct super_block *s;
-       fmode_t mode = FMODE_READ;
+       fmode_t mode = FMODE_READ | FMODE_EXCL;
        int error = 0;
 
        if (!(flags & MS_RDONLY))
                mode |= FMODE_WRITE;
 
-       bdev = open_bdev_exclusive(dev_name, mode, fs_type);
+       bdev = blkdev_get_by_path(dev_name, mode, fs_type);
        if (IS_ERR(bdev))
                return ERR_CAST(bdev);
 
@@ -802,13 +808,13 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
 
                /*
                 * s_umount nests inside bd_mutex during
-                * __invalidate_device().  close_bdev_exclusive()
-                * acquires bd_mutex and can't be called under
-                * s_umount.  Drop s_umount temporarily.  This is safe
-                * as we're holding an active reference.
+                * __invalidate_device().  blkdev_put() acquires
+                * bd_mutex and can't be called under s_umount.  Drop
+                * s_umount temporarily.  This is safe as we're
+                * holding an active reference.
                 */
                up_write(&s->s_umount);
-               close_bdev_exclusive(bdev, mode);
+               blkdev_put(bdev, mode);
                down_write(&s->s_umount);
        } else {
                char b[BDEVNAME_SIZE];
@@ -832,7 +838,7 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
 error_s:
        error = PTR_ERR(s);
 error_bdev:
-       close_bdev_exclusive(bdev, mode);
+       blkdev_put(bdev, mode);
 error:
        return ERR_PTR(error);
 }
@@ -863,7 +869,8 @@ void kill_block_super(struct super_block *sb)
        bdev->bd_super = NULL;
        generic_shutdown_super(sb);
        sync_blockdev(bdev);
-       close_bdev_exclusive(bdev, mode);
+       WARN_ON_ONCE(!(mode & FMODE_EXCL));
+       blkdev_put(bdev, mode | FMODE_EXCL);
 }
 
 EXPORT_SYMBOL(kill_block_super);
@@ -997,6 +1004,7 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
        }
        BUG_ON(!mnt->mnt_sb);
        WARN_ON(!mnt->mnt_sb->s_bdi);
+       WARN_ON(mnt->mnt_sb->s_bdi == &default_backing_dev_info);
        mnt->mnt_sb->s_flags |= MS_BORN;
 
        error = security_sb_kern_mount(mnt->mnt_sb, flags, secdata);