xfs: make the reserved block permission flag explicit in xfs_attr_set

Make the use of reserved blocks an explicit parameter to xfs_attr_set.
Userspace setting XFS_ATTR_ROOT attrs should continue to be able to use
it, but for online repairs we can back out and therefore do not care.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/libxfs/xfs_attr.c

@@ -952,7 +952,7 @@ xfs_attr_lookup(
  * Make a change to the xattr structure.
  *
  * The caller must have initialized @args, attached dquots, and must not hold
- * any ILOCKs.
+ * any ILOCKs.  Reserved data blocks may be used if @rsvd is set.
  *
  * Returns -EEXIST for XFS_ATTRUPDATE_CREATE if the name already exists.
  * Returns -ENOATTR for XFS_ATTRUPDATE_REMOVE if the name does not exist.
@@ -961,12 +961,12 @@ xfs_attr_lookup(
 int
 xfs_attr_set(
 	struct xfs_da_args	*args,
-	enum xfs_attr_update	op)
+	enum xfs_attr_update	op,
+	bool			rsvd)
 {
 	struct xfs_inode	*dp = args->dp;
 	struct xfs_mount	*mp = dp->i_mount;
 	struct xfs_trans_res	tres;
-	bool			rsvd = (args->attr_filter & XFS_ATTR_ROOT);
 	int			error, local;
 	int			rmt_blks = 0;
 	unsigned int		total;

fs/xfs/libxfs/xfs_attr.h

@@ -558,7 +558,7 @@ enum xfs_attr_update {
 	XFS_ATTRUPDATE_REPLACE,	/* set value, fail if attr does not exist */
 };
 
-int xfs_attr_set(struct xfs_da_args *args, enum xfs_attr_update op);
+int xfs_attr_set(struct xfs_da_args *args, enum xfs_attr_update op, bool rsvd);
 int xfs_attr_set_iter(struct xfs_attr_intent *attr);
 int xfs_attr_remove_iter(struct xfs_attr_intent *attr);
 bool xfs_attr_check_namespace(unsigned int attr_flags);

fs/xfs/scrub/attr_repair.c

@@ -606,7 +606,7 @@ xrep_xattr_insert_rec(
 	 * already exists, we'll just drop it during the rebuild.
 	 */
 	xfs_attr_sethash(&args);
-	error = xfs_attr_set(&args, XFS_ATTRUPDATE_CREATE);
+	error = xfs_attr_set(&args, XFS_ATTRUPDATE_CREATE, false);
 	if (error == -EEXIST)
 		error = 0;
 

fs/xfs/xfs_xattr.c

@@ -110,7 +110,7 @@ xfs_attr_change(
 	args->whichfork = XFS_ATTR_FORK;
 	xfs_attr_sethash(args);
 
-	return xfs_attr_set(args, op);
+	return xfs_attr_set(args, op, args->attr_filter & XFS_ATTR_ROOT);
 }