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Btrfs: remove scrub_super_lock holding in btrfs_sync_log()

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Originally, we introduced scrub_super_lock to synchronize
tree log code with scrubbing super.

However we can replace scrub_super_lock with device_list_mutex,
because writing super will hold this mutex, this will reduce an extra
lock holding when writing supers in sync log code.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Wang Shilong 2013-10-25 19:12:02 +08:00 • committed by Chris Mason
parent 7fdf4b608d
commit 9b011adfe1
5 changed files with 8 additions and 20 deletions
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2
fs/btrfs/tree-log.c
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@ -2586,9 +2586,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
* the running transaction open, so a full commit can't hop
* in and cause problems either.
*/
btrfs_scrub_pause_super(root);
ret = write_ctree_super(trans, root->fs_info->tree_root, 1);
btrfs_scrub_continue_super(root);
if (ret) {
btrfs_abort_transaction(trans, root, ret);
goto out_wake_log_root;