[PATCH V2] xfs_repair: fix max block offset test

Eryu pointed out that in fstest xfs/071, we find corruption
reported at the end.  This test attempts to do IO at the
maximum possible offsets, and repair yields:

inode 1027 - extent offset too large - start 70, count 1, offset 2251799813685247
correcting nextents for inode 1027
bad data fork in inode 1027
would have cleared inode 1027

Repair is complaining that an extent *starts* at the maximum
block, but AFAICT, starting there is just fine, as long as
we also end there.  i.e. a one-block extent at the limit
is just fine.

So change the xfs_repair test to allow this situation.

Also, the warning text is a bit unclear, mixing in the physical
block w/ the logical block... rearrange that a little to make
it obvious.

Reported-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
---

V2: Update the warning text

diff --git a/repair/dinode.c b/repair/dinode.c
index 38a6562..59824ec 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -667,12 +667,14 @@ _("inode %" PRIu64 " - bad extent overflows - start %" PRIu64 ", "
 					irec.br_startoff);
 				goto done;
 		}
-		if (irec.br_startoff >= fs_max_file_offset)  {
+		/* Ensure this extent does not extend beyond the max offset */
+		if (irec.br_startoff + irec.br_blockcount - 1 >
+							fs_max_file_offset) {
 			do_warn(
-_("inode %" PRIu64 " - extent offset too large - start %" PRIu64 ", "
-  "count %" PRIu64 ", offset %" PRIu64 "\n"),
-				ino, irec.br_startblock, irec.br_blockcount,
-				irec.br_startoff);
+_("inode %" PRIu64 " - extent exceeds max offset - start %" PRIu64 ", "
+  "count %" PRIu64 ", physical block %" PRIu64 "\n"),
+				ino, irec.br_startoff, irec.br_blockcount,
+				irec.br_startblock);
 			goto done;
 		}