[PATCH 10/18] xfs: simplify xfs_map_blocks by using xfs_iext_lookup_extent directly

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xfs_bmapi_read adds zero value in xfs_map_blocks.  Replace it with a
direct call to the low-level extent lookup function.

Note that we now always pass a 0 length to the trace points as we ask
for an unspecified len.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/xfs/xfs_aops.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 587493e9c8a1..cef2bc3cf98b 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -387,7 +387,6 @@ xfs_map_blocks(
 	int			whichfork = XFS_DATA_FORK;
 	struct xfs_iext_cursor	icur;
 	int			error = 0;
-	int			nimaps = 1;
 
 	if (XFS_FORCED_SHUTDOWN(mp))
 		return -EIO;
@@ -429,24 +428,16 @@ xfs_map_blocks(
 		goto allocate_blocks;
 	}
 
-	error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
-				imap, &nimaps, XFS_BMAPI_ENTIRE);
+	if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, imap))
+		imap->br_startoff = end_fsb;	/* fake a hole past EOF */
 	xfs_iunlock(ip, XFS_ILOCK_SHARED);
-	if (error)
-		return error;
 
-	if (!nimaps) {
-		/*
-		 * Lookup returns no match? Beyond eof? regardless,
-		 * return it as a hole so we don't write it
-		 */
+	if (imap->br_startoff > offset_fsb) {
+		/* landed in a hole or beyond EOF */
+		imap->br_blockcount = imap->br_startoff - offset_fsb;
 		imap->br_startoff = offset_fsb;
-		imap->br_blockcount = end_fsb - offset_fsb;
 		imap->br_startblock = HOLESTARTBLOCK;
 		*type = XFS_IO_HOLE;
-	} else if (imap->br_startblock == HOLESTARTBLOCK) {
-		/* landed in a hole */
-		*type = XFS_IO_HOLE;
 	} else {
 		if (isnullstartblock(imap->br_startblock)) {
 			/* got a delalloc extent */
-- 
2.17.0




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