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Btrfs: fix lockdep warning 

The locking order for stuff is

__sb_start_write
ordered_mutex

but with sync() we don't do __sb_start_write for some strange reason, which
means that our iput in wait_ordered_extents could start a transaction which does
the __sb_start_write while we're holding the ordered_mutex.  Fix this by using
delayed iput in sync.  Thanks,

Reported-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-04-17 12:16:59 -04:00
parent 534e6623b7
commit 62dbd7176e
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/super.c
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@ -866,7 +866,7 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
return 0;
}
btrfs_wait_ordered_extents(root, 0);
btrfs_wait_ordered_extents(root, 1);
trans = btrfs_attach_transaction_barrier(root);
if (IS_ERR(trans)) {