[PATCH 03/13] xfs_repair: make CRC checking consistent in path verification

[Eric Sandeen <sandeen@xxxxxxxxxxx>]

verify_da_path and verify_dir2_path both take steps to
re-compute the CRC of the block if it otherwise looks
ok and no other changes are needed.  They do this inside
a loop, but the approach differs; verify_da_path expects
its caller to check the first buffer prior to the loop,
and verify_dir2_path expects its caller to check the last
buffer after the loop.

Make this consistent by semi-arbitrarily choosing to make
verify_da_path (and its caller) match the method used by
verify_dir2_path, and check the last buffer after the
loop is done.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxxx>
---
 repair/attr_repair.c |   24 ++++++++++++++----------
 1 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/repair/attr_repair.c b/repair/attr_repair.c
index f29a5bd..aba0782 100644
--- a/repair/attr_repair.c
+++ b/repair/attr_repair.c
@@ -606,6 +606,14 @@ verify_da_path(xfs_mount_t *mp,
                ASSERT(cursor->level[this_level].dirty == 0 ||
                        (cursor->level[this_level].dirty && !no_modify));
 
+               /*
+                * 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].dirty && !no_modify)
                        libxfs_writebuf(cursor->level[this_level].bp, 0);
                else
@@ -618,14 +626,6 @@ verify_da_path(xfs_mount_t *mp,
                cursor->level[this_level].hashval =
                                        be32_to_cpu(btree[0].hashval);
                entry = cursor->level[this_level].index = 0;
-
-               /*
-                * We want to rewrite the buffer on a CRC error seeing as it
-                * contains what appears to be a valid node block, but only if
-                * we are fixing errors.
-                */
-               if (bp->b_error == -EFSBADCRC && !no_modify)
-                       cursor->level[this_level].dirty++;
        }
        /*
         * ditto for block numbers
@@ -1363,8 +1363,6 @@ process_leaf_attr_level(xfs_mount_t       *mp,
                                da_bno, dev_bno, ino);
                        goto error_out;
                }
-               if (bp->b_error == -EFSBADCRC)
-                       repair++;
 
                leaf = bp->b_addr;
                xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
@@ -1419,6 +1417,12 @@ process_leaf_attr_level(xfs_mount_t      *mp,
                }
 
                current_hashval = greatest_hashval;
+                /*
+                * If block looks ok but CRC didn't match, make sure to
+                * recompute it.
+                */
+               if (!no_modify && bp->b_error == -EFSBADCRC)
+                       repair++;
 
                if (repair && !no_modify)
                        libxfs_writebuf(bp, 0);
-- 
1.7.1