e2fsck: verify and correct MMP checksum problems

Check and handle MMP checksum problems by resetting the block.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index c948fcd..78b05bb 100644 (file)
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -442,6 +442,11 @@ static struct e2fsck_problem problem_table[] = {
             "bits cannot be set simultaneously."),
          PROMPT_FIX, PR_PREEN_OK | PR_NO_OK},
 
+       /* Superblock has invalid MMP checksum. */
+       { PR_0_MMP_CSUM_INVALID,
+         N_("@S MMP block checksum does not match MMP block.  "),
+         PROMPT_FIX, PR_PREEN_OK | PR_NO_OK},
+
        /* Pass 1 errors */
 
        /* Pass 1: Checking inodes, blocks, and sizes */

diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index db135dc..5caade4 100644 (file)
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -255,6 +255,9 @@ struct problem_context {
  */
 #define PR_0_META_AND_GDT_CSUM_SET             0x000046
 
+/* Superblock has invalid MMP checksum. */
+#define PR_0_MMP_CSUM_INVALID                  0x000047
+
 
 /*
  * Pass 1 errors

diff --git a/e2fsck/unix.c b/e2fsck/unix.c
index e058d2b..d2b1bbd 100644 (file)
--- a/e2fsck/unix.c
+++ b/e2fsck/unix.c
@@ -1151,6 +1151,11 @@ check_error:
                        ext2fs_mmp_clear(fs);
                        retval = 0;
                }
+       } else if (retval == EXT2_ET_MMP_CSUM_INVALID) {
+               if (fix_problem(ctx, PR_0_MMP_CSUM_INVALID, &pctx)) {
+                       ext2fs_mmp_clear(fs);
+                       retval = 0;
+               }
        }
        return retval;
 }