xfs: indicate if xfs_bmap_adjacent changed ap->blkno

Add a return value to xfs_bmap_adjacent to indicate if it did change
ap->blkno or not.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

fs/xfs/libxfs/xfs_bmap.c

@@ -3044,7 +3044,8 @@ xfs_bmap_extsize_align(
 
 #define XFS_ALLOC_GAP_UNITS	4
 
-void
+/* returns true if ap->blkno was modified */
+bool
 xfs_bmap_adjacent(
 	struct xfs_bmalloca	*ap)	/* bmap alloc argument struct */
 {
@@ -3079,13 +3080,14 @@ xfs_bmap_adjacent(
 		if (adjust &&
 		    ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
 			ap->blkno += adjust;
+		return true;
 	}
 	/*
 	 * If not at eof, then compare the two neighbor blocks.
 	 * Figure out whether either one gives us a good starting point,
 	 * and pick the better one.
 	 */
-	else if (!ap->eof) {
+	if (!ap->eof) {
 		xfs_fsblock_t	gotbno;		/* right side block number */
 		xfs_fsblock_t	gotdiff=0;	/* right side difference */
 		xfs_fsblock_t	prevbno;	/* left side block number */
@@ -3165,14 +3167,21 @@ xfs_bmap_adjacent(
 		 * If both valid, pick the better one, else the only good
 		 * one, else ap->blkno is already set (to 0 or the inode block).
 		 */
-		if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
+		if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK) {
 			ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
-		else if (prevbno != NULLFSBLOCK)
+			return true;
+		}
+		if (prevbno != NULLFSBLOCK) {
 			ap->blkno = prevbno;
-		else if (gotbno != NULLFSBLOCK)
+			return true;
+		}
+		if (gotbno != NULLFSBLOCK) {
 			ap->blkno = gotbno;
+			return true;
+		}
 	}
 #undef ISVALID
+	return false;
 }
 
 int

fs/xfs/xfs_bmap_util.h

@@ -47,7 +47,7 @@ int	xfs_bmap_extsize_align(struct xfs_mount *mp, struct xfs_bmbt_irec *gotp,
 			       struct xfs_bmbt_irec *prevp, xfs_extlen_t extsz,
 			       int rt, int eof, int delay, int convert,
 			       xfs_fileoff_t *offp, xfs_extlen_t *lenp);
-void	xfs_bmap_adjacent(struct xfs_bmalloca *ap);
+bool	xfs_bmap_adjacent(struct xfs_bmalloca *ap);
 int	xfs_bmap_last_extent(struct xfs_trans *tp, struct xfs_inode *ip,
 			     int whichfork, struct xfs_bmbt_irec *rec,
 			     int *is_empty);