diff options
| -rw-r--r-- | drivers/md/dm.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 0e4c8d3ca9f..9687a084b5f 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -991,22 +991,38 @@ int dm_swap_table(struct mapped_device *md, struct dm_table *table) */ static int __lock_fs(struct mapped_device *md) { + int error = -ENOMEM; + if (test_and_set_bit(DMF_FS_LOCKED, &md->flags)) return 0; md->frozen_bdev = bdget_disk(md->disk, 0); if (!md->frozen_bdev) { DMWARN("bdget failed in __lock_fs"); - return -ENOMEM; + goto out; } WARN_ON(md->frozen_sb); + md->frozen_sb = freeze_bdev(md->frozen_bdev); + if (IS_ERR(md->frozen_sb)) { + error = PTR_ERR(md->frozen_sb); + goto out_bdput; + } + /* don't bdput right now, we don't want the bdev * to go away while it is locked. We'll bdput * in __unlock_fs */ return 0; + +out_bdput: + bdput(md->frozen_bdev); + md->frozen_sb = NULL; + md->frozen_bdev = NULL; +out: + clear_bit(DMF_FS_LOCKED, &md->flags); + return error; } static void __unlock_fs(struct mapped_device *md) |