[PATCH] xfs_repair: log when buffers fail CRC checks even if we just recompute it

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

We should always log metadata block CRC validation errors, even if we
decide that the block contents are ok and that we'll simply recompute
the checksum.  Without this, xfs_repair -n doesn't say anything about
crc errors.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 repair/attr_repair.c |   15 ++++++++++++---
 repair/da_util.c     |   12 ++++++++----
 repair/dir2.c        |   28 +++++++++++++++++++++-------
 3 files changed, 41 insertions(+), 14 deletions(-)

diff --git a/repair/attr_repair.c b/repair/attr_repair.c
index 2d0df492f71a..2324757d4c44 100644
--- a/repair/attr_repair.c
+++ b/repair/attr_repair.c
@@ -971,8 +971,13 @@ process_leaf_attr_level(xfs_mount_t	*mp,
 		 * If block looks ok but CRC didn't match, make sure to
 		 * recompute it.
 		 */
-		if (!no_modify && bp->b_error == -EFSBADCRC)
-			repair++;
+		if (bp->b_error == -EFSBADCRC) {
+			do_warn(
+ _("bad checksum for block %u in attribute fork for inode %" PRIu64 "\n"),
+				da_bno, ino);
+			if (!no_modify)
+				repair++;
+		}
 
 		if (repair && !no_modify) {
 			libxfs_buf_mark_dirty(bp);
@@ -1252,8 +1257,12 @@ process_longform_attr(
 		return 1;
 	}
 
-	if (bp->b_error == -EFSBADCRC)
+	if (bp->b_error == -EFSBADCRC) {
+		do_warn(
+ _("bad checksum for block 0 in attribute fork for inode %" PRIu64 "\n"),
+				ino);
 		(*repair)++;
+	}
 
 	/* is this block sane? */
 	if (__check_attr_header(mp, bp, ino)) {
diff --git a/repair/da_util.c b/repair/da_util.c
index b229422c81e8..7f94f4012062 100644
--- a/repair/da_util.c
+++ b/repair/da_util.c
@@ -562,7 +562,7 @@ _("can't read %s block %u for inode %" PRIu64 "\n"),
 				FORKNAME(whichfork), dabno, cursor->ino);
 			return 1;
 		}
-		if (bp->b_error == -EFSCORRUPTED || bp->b_error == -EFSBADCRC) {
+		if (bp->b_error == -EFSCORRUPTED) {
 			do_warn(
 _("corrupt %s tree block %u for inode %" PRIu64 "\n"),
 				FORKNAME(whichfork), dabno, cursor->ino);
@@ -625,9 +625,13 @@ _("bad level %d in %s block %u for inode %" PRIu64 "\n"),
 		 * If block looks ok but CRC didn't match, make sure to
 		 * recompute it.
 		 */
-		if (!no_modify &&
-		    cursor->level[this_level].bp->b_error == -EFSBADCRC)
-			cursor->level[this_level].dirty = 1;
+		if (cursor->level[this_level].bp->b_error == -EFSBADCRC) {
+			do_warn(
+ _("bad checksum in %s tree block %u for inode %" PRIu64 "\n"),
+				FORKNAME(whichfork), dabno, cursor->ino);
+			if (!no_modify)
+				cursor->level[this_level].dirty = 1;
+		}
 
 		if (cursor->level[this_level].dirty && !no_modify) {
 			libxfs_buf_mark_dirty(cursor->level[this_level].bp);
diff --git a/repair/dir2.c b/repair/dir2.c
index 9fd9569ec9f8..c9b54c3a2802 100644
--- a/repair/dir2.c
+++ b/repair/dir2.c
@@ -1103,8 +1103,13 @@ _("bad directory block magic # %#x in block %u for directory inode %" PRIu64 "\n
 	rval = process_dir2_data(mp, ino, dip, ino_discovery, dirname, parent,
 		bp, dot, dotdot, mp->m_dir_geo->datablk, (char *)blp, &dirty);
 	/* If block looks ok but CRC didn't match, make sure to recompute it. */
-	if (!rval && bp->b_error == -EFSBADCRC)
-		dirty = 1;
+	if (bp->b_error == -EFSBADCRC) {
+		do_warn(
+ _("corrupt directory block %u for inode %" PRIu64 "\n"),
+				mp->m_dir_geo->datablk, ino);
+		if (!rval)
+			dirty = 1;
+	}
 	if (dirty && !no_modify) {
 		*repair = 1;
 		libxfs_buf_mark_dirty(bp);
@@ -1280,8 +1285,14 @@ _("bad sibling back pointer for block %u in directory inode %" PRIu64 "\n"),
 		 * If block looks ok but CRC didn't match, make sure to
 		 * recompute it.
 		 */
-		if (!no_modify && bp->b_error == -EFSBADCRC)
-			buf_dirty = 1;
+		if (bp->b_error == -EFSBADCRC) {
+			do_warn(
+ _("bad checksum for directory leafn block %u for inode %" PRIu64 "\n"),
+				da_bno, ino);
+			if (!no_modify)
+				buf_dirty = 1;
+		}
+
 		ASSERT(buf_dirty == 0 || (buf_dirty && !no_modify));
 		if (buf_dirty && !no_modify) {
 			*repair = 1;
@@ -1444,10 +1455,13 @@ _("bad directory block magic # %#x in block %" PRIu64 " for directory inode %" P
 		i = process_dir2_data(mp, ino, dip, ino_discovery, dirname,
 			parent, bp, dot, dotdot, (xfs_dablk_t)dbno,
 			(char *)data + mp->m_dir_geo->blksize, &dirty);
-		if (i == 0) {
+		if (i == 0)
 			good++;
-			/* Maybe just CRC is wrong. Make sure we correct it. */
-			if (bp->b_error == -EFSBADCRC)
+		if (bp->b_error == -EFSBADCRC) {
+			do_warn(
+ _("bad checksum in directory data block %" PRIu64 " for inode %" PRIu64 "\n"),
+				dbno, ino);
+			if (i == 0)
 				dirty = 1;
 		}
 		if (dirty && !no_modify) {