[PATCH 3.13 136/140] Btrfs: handle EAGAIN case properly in btrfs_drop_snapshot()

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3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>

commit 90515e7f5d7d24cbb2a4038a3f1b5cfa2921aa17 upstream.

We may return early in btrfs_drop_snapshot(), we shouldn't
call btrfs_std_err() for this case, fix it.

Signed-off-by: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Josef Bacik <jbacik@xxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/btrfs/extent-tree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7779,7 +7779,7 @@ out:
 	 */
 	if (!for_reloc && root_dropped == false)
 		btrfs_add_dead_root(root);
-	if (err)
+	if (err && err != -EAGAIN)
 		btrfs_std_error(root->fs_info, err);
 	return err;
 }


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