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btrfs: document uuid_mutex uasge in read_chunk_tree

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read_chunk_tree() calls read_one_dev(), but for seed device we have
to search the fs_uuids list, so we need the uuid_mutex. Add a comment
comment, so that we can improve this part.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2018-04-12 10:29:32 +08:00 committed by David Sterba
parent 41a52a0f1b
commit 3dd0f7a364
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/volumes.c
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@ -6932,6 +6932,10 @@ int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info)
if (!path)
return -ENOMEM;
/*
* uuid_mutex is needed only if we are mounting a sprout FS
* otherwise we don't need it.
*/
mutex_lock(&uuid_mutex);
mutex_lock(&fs_info->chunk_mutex);