From: Chris Mason <chris.mason@fusionio.com>
Date: Wed, 6 Feb 2013 17:06:02 +0000 (-0500)
Subject: Btrfs: move d_instantiate outside the transaction during mksubvol
X-Git-Tag: MMI-PSA29.97-13-9~15079^2
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1a65e24b0bb7dde48cac4a2bf74d5558f9e32ba7;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

Btrfs: move d_instantiate outside the transaction during mksubvol

Dave Sterba triggered a lockdep complaint about lock ordering
between the sb_internal lock and the cleaner semaphore.

btrfs_lookup_dentry() checks for orphans if we're looking up
the inode for a subvolume, and subvolume creation is triggering
the lookup with a transaction running.

This commit moves the d_instantiate after the transaction closes.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index afbf3ac2079d..a31cd931d36e 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -515,7 +515,6 @@ static noinline int create_subvol(struct btrfs_root *root,
 
 	BUG_ON(ret);
 
-	d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
 fail:
 	if (async_transid) {
 		*async_transid = trans->transid;
@@ -525,6 +524,10 @@ fail:
 	}
 	if (err && !ret)
 		ret = err;
+
+	if (!ret)
+		d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
+
 	return ret;
 }