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btrfs: drop uuid_mutex in btrfs_destroy_dev_replace_tgtdev 

Delete the uuid_mutex lock here as this thread accesses the
btrfs_fs_devices::devices only (counters or called functions do a list
traversal). And the device_list_mutex lock is already taken.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2018-04-12 10:29:37 +08:00 committed by David Sterba
parent b25e59e2b2
commit ab5c2f65de
1 changed files with 0 additions and 2 deletions
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2
fs/btrfs/volumes.c
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@ -2152,7 +2152,6 @@ void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info,
void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
struct btrfs_device *tgtdev)
{
mutex_lock(&uuid_mutex);
WARN_ON(!tgtdev);
mutex_lock(&fs_info->fs_devices->device_list_mutex);
@ -2168,7 +2167,6 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
list_del_rcu(&tgtdev->dev_list);
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
mutex_unlock(&uuid_mutex);
/*
* The update_dev_time() with in btrfs_scratch_superblocks()