btrfs: Fix a deadlock in btrfs_dev_replace_finishing()

btrfs-transacion:5657
[stack snip]
btrfs_bio_map()
    btrfs_bio_counter_inc_blocked()
        percpu_counter_inc(&fs_info->bio_counter)  ###bio_counter > 0(A)
        __btrfs_bio_map()
            btrfs_dev_replace_lock()
                mutex_lock(dev_replace->lock)	   ###wait mutex(B)

btrfs:32612
[stack snip]
btrfs_dev_replace_start()
    btrfs_dev_replace_lock()
	mutex_lock(dev_replace->lock)		   ###hold mutex(B)
    btrfs_dev_replace_finishing()
        btrfs_rm_dev_replace_blocked()
            wait until percpu_counter_sum == 0	   ###wait on bio_counter(A)

This bug can be triggered quite easily by the following test script:
http://pastebin.com/MQmb37Cy

This patch will fix the ABBA problem by calling
btrfs_dev_replace_unlock() before btrfs_rm_dev_replace_blocked().

The consistency of btrfs devices list and their superblocks is protected
by device_list_mutex, not btrfs_dev_replace_lock/unlock().
So it is safe the move btrfs_dev_replace_unlock() before
btrfs_rm_dev_replace_blocked().

Reported-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Cc: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 64657b3ae97a..a85b5f53856e 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -569,6 +569,8 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
         btrfs_kobj_rm_device(fs_info, src_device);
         btrfs_kobj_add_device(fs_info, tgt_device);
 
+        btrfs_dev_replace_unlock(dev_replace);
+
         btrfs_rm_dev_replace_blocked(fs_info);
 
         btrfs_rm_dev_replace_srcdev(fs_info, src_device);
@@ -582,7 +584,6 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
          * superblock is scratched out so that it is no longer marked to
          * belong to this filesystem.
          */
-        btrfs_dev_replace_unlock(dev_replace);
         mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
         mutex_unlock(&root->fs_info->chunk_mutex);