xfs: rename and simplify xfs_bmap_one_block

xfs_bmap_one_block is only called for the attribute fork.  Move it to
xfs_attr.c, drop the unused whichfork argument and code only executed for
the data fork and rename the result to xfs_attr_is_leaf.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NBrian Foster <bfoster@redhat.com>
Reviewed-by: NDarrick J. Wong <djwong@kernel.org>
Signed-off-by: NDarrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_attr.c

@@ -70,6 +70,26 @@ xfs_inode_hasattr(
 	return 1;
 }
 
+/*
+ * Returns true if the there is exactly only block in the attr fork, in which
+ * case the attribute fork consists of a single leaf block entry.
+ */
+bool
+xfs_attr_is_leaf(
+	struct xfs_inode	*ip)
+{
+	struct xfs_ifork	*ifp = ip->i_afp;
+	struct xfs_iext_cursor	icur;
+	struct xfs_bmbt_irec	imap;
+
+	if (ifp->if_nextents != 1 || ifp->if_format != XFS_DINODE_FMT_EXTENTS)
+		return false;
+
+	xfs_iext_first(ifp, &icur);
+	xfs_iext_get_extent(ifp, &icur, &imap);
+	return imap.br_startoff == 0 && imap.br_blockcount == 1;
+}
+
 /*========================================================================
  * Overall external interface routines.
  *========================================================================*/
@@ -89,7 +109,7 @@ xfs_attr_get_ilocked(
 
 	if (args->dp->i_afp->if_format == XFS_DINODE_FMT_LOCAL)
 		return xfs_attr_shortform_getvalue(args);
-	if (xfs_bmap_one_block(args->dp, XFS_ATTR_FORK))
+	if (xfs_attr_is_leaf(args->dp))
 		return xfs_attr_leaf_get(args);
 	return xfs_attr_node_get(args);
 }
@@ -293,7 +313,7 @@ xfs_attr_set_args(
 			return error;
 	}
 
-	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
+	if (xfs_attr_is_leaf(dp)) {
 		error = xfs_attr_leaf_addname(args);
 		if (error != -ENOSPC)
 			return error;
@@ -347,7 +367,7 @@ xfs_has_attr(
 		return xfs_attr_sf_findname(args, NULL, NULL);
 	}
 
-	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
+	if (xfs_attr_is_leaf(dp)) {
 		error = xfs_attr_leaf_hasname(args, &bp);
 
 		if (bp)
@@ -374,7 +394,7 @@ xfs_attr_remove_args(
 	} else if (dp->i_afp->if_format == XFS_DINODE_FMT_LOCAL) {
 		ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
 		error = xfs_attr_shortform_remove(args);
-	} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
+	} else if (xfs_attr_is_leaf(dp)) {
 		error = xfs_attr_leaf_removename(args);
 	} else {
 		error = xfs_attr_node_removename(args);
@@ -1283,7 +1303,7 @@ xfs_attr_node_removename(
 	/*
 	 * If the result is small enough, push it all into the inode.
 	 */
-	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
+	if (xfs_attr_is_leaf(dp))
 		error = xfs_attr_node_shrink(args, state);
 
 out:

fs/xfs/libxfs/xfs_attr.h

@@ -85,6 +85,7 @@ int xfs_attr_inactive(struct xfs_inode *dp);
 int xfs_attr_list_ilocked(struct xfs_attr_list_context *);
 int xfs_attr_list(struct xfs_attr_list_context *);
 int xfs_inode_hasattr(struct xfs_inode *ip);
+bool xfs_attr_is_leaf(struct xfs_inode *ip);
 int xfs_attr_get_ilocked(struct xfs_da_args *args);
 int xfs_attr_get(struct xfs_da_args *args);
 int xfs_attr_set(struct xfs_da_args *args);

fs/xfs/libxfs/xfs_bmap.c

@@ -1441,38 +1441,6 @@ xfs_bmap_last_offset(
 	return 0;
 }
 
-/*
- * Returns whether the selected fork of the inode has exactly one
- * block or not.  For the data fork we check this matches i_disk_size,
- * implying the file's range is 0..bsize-1.
- */
-int					/* 1=>1 block, 0=>otherwise */
-xfs_bmap_one_block(
-	struct xfs_inode	*ip,		/* incore inode */
-	int			whichfork)	/* data or attr fork */
-{
-	struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, whichfork);
-	int			rval;		/* return value */
-	struct xfs_bmbt_irec	s;		/* internal version of extent */
-	struct xfs_iext_cursor icur;
-
-#ifndef DEBUG
-	if (whichfork == XFS_DATA_FORK)
-		return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize;
-#endif	/* !DEBUG */
-	if (ifp->if_nextents != 1)
-		return 0;
-	if (ifp->if_format != XFS_DINODE_FMT_EXTENTS)
-		return 0;
-	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
-	xfs_iext_first(ifp, &icur);
-	xfs_iext_get_extent(ifp, &icur, &s);
-	rval = s.br_startoff == 0 && s.br_blockcount == 1;
-	if (rval && whichfork == XFS_DATA_FORK)
-		ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize);
-	return rval;
-}
-
 /*
  * Extent tree manipulation functions used during allocation.
  */

fs/xfs/libxfs/xfs_bmap.h

@@ -200,7 +200,6 @@ int	xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t *last_block, int whichfork);
 int	xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
 		int whichfork);
-int	xfs_bmap_one_block(struct xfs_inode *ip, int whichfork);
 int	xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
 		xfs_filblks_t len, struct xfs_bmbt_irec *mval,
 		int *nmap, int flags);

fs/xfs/xfs_attr_list.c

@@ -514,7 +514,7 @@ xfs_attr_list_ilocked(
 		return 0;
 	if (dp->i_afp->if_format == XFS_DINODE_FMT_LOCAL)
 		return xfs_attr_shortform_list(context);
-	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
+	if (xfs_attr_is_leaf(dp))
 		return xfs_attr_leaf_list(context);
 	return xfs_attr_node_list(context);
 }