btrfs: xattr: fix attribute removal

An attribute is not removed by 'setfattr -x attr file' and remains
visible in attr list. This makes xfstests/062 pass again.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index d733b9cfea34..69565e5fc6a0 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -116,6 +116,12 @@ static int do_setxattr(struct btrfs_trans_handle *trans,
                 if (ret)
                         goto out;
                 btrfs_release_path(path);
+
+                /*
+                 * remove the attribute
+                 */
+                if (!value)
+                        goto out;
         }
 
 again:
@@ -158,6 +164,9 @@ out:
         return ret;
 }
 
+/*
+ * @value: "" makes the attribute to empty, NULL removes it
+ */
 int __btrfs_setxattr(struct btrfs_trans_handle *trans,
                      struct inode *inode, const char *name,
                      const void *value, size_t size, int flags)