[PATCH] xfs_repair: fix max block offset test

From: Eric Sandeen <sandeen@redhat.com>
To: xfs-oss <xfs@oss.sgi.com>
Cc: Eryu Guan <eguan@redhat.com>
Subject: [PATCH] xfs_repair: fix max block offset test
Date: Thu, 11 Dec 2014 11:54:03 -0600	[thread overview]
Message-ID: <5489DA3B.5050908@redhat.com> (raw)

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.

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

diff --git a/repair/dinode.c b/repair/dinode.c
index 38a6562..ca57a61 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -667,7 +667,9 @@ _("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"),

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