From: Josef Bacik <jbacik@fb.com>
Date: Fri, 7 Feb 2014 17:21:23 +0000 (-0500)
Subject: Btrfs: unlock extent and pages on error in cow_file_range
X-Git-Tag: firefly_0821_release~176^2~3883^2~122
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=29bce2f3997a8dc5195b7a7724362d1e55df7bb2;p=firefly-linux-kernel-4.4.55.git

Btrfs: unlock extent and pages on error in cow_file_range

When I converted the BUG_ON() for the free_space_cache_inode in cow_file_range I
made it so we just return an error instead of unlocking all of our various
stuff.  This is a mistake and causes us to hang when we run into this.  This
patch fixes this problem.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
---

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a7e6690e0946..5b8925003090 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -864,7 +864,8 @@ static noinline int cow_file_range(struct inode *inode,
 
 	if (btrfs_is_free_space_inode(inode)) {
 		WARN_ON_ONCE(1);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto out_unlock;
 	}
 
 	num_bytes = ALIGN(end - start + 1, blocksize);