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authorDarrick J. Wong <djwong@us.ibm.com>2012-05-27 08:10:25 -0400
committerTheodore Ts'o <tytso@mit.edu>2012-05-27 08:10:25 -0400
commit1f56c5890e3e815c6f4eabfc87a8a81f439b6f3d (patch)
tree667650c31970f9a89b26d701bf595c5599776eda /fs/jbd2/recovery.c
parent3caa487f53f65fd1e3950a6b6ae1709e6c43b334 (diff)
downloadlinux-1f56c5890e3e815c6f4eabfc87a8a81f439b6f3d.tar.bz2
jbd2: checksum commit blocks
Calculate and verify the checksum of commit blocks. In checksum v2, deprecate most of the checksum v1 commit block checksum fields, since each block has its own checksum. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2/recovery.c')
-rw-r--r--fs/jbd2/recovery.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 066ee603db50..df4a20e7d854 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -375,6 +375,24 @@ static int calc_chksums(journal_t *journal, struct buffer_head *bh,
return 0;
}
+static int jbd2_commit_block_csum_verify(journal_t *j, void *buf)
+{
+ struct commit_header *h;
+ __u32 provided, calculated;
+
+ if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ return 1;
+
+ h = buf;
+ provided = h->h_chksum[0];
+ h->h_chksum[0] = 0;
+ calculated = jbd2_chksum(j, j->j_csum_seed, buf, j->j_blocksize);
+ h->h_chksum[0] = provided;
+
+ provided = be32_to_cpu(provided);
+ return provided == calculated;
+}
+
static int do_one_pass(journal_t *journal,
struct recovery_info *info, enum passtype pass)
{
@@ -685,6 +703,19 @@ static int do_one_pass(journal_t *journal,
}
crc32_sum = ~0;
}
+ if (pass == PASS_SCAN &&
+ !jbd2_commit_block_csum_verify(journal,
+ bh->b_data)) {
+ info->end_transaction = next_commit_ID;
+
+ if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
+ JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
+ journal->j_failed_commit =
+ next_commit_ID;
+ brelse(bh);
+ break;
+ }
+ }
brelse(bh);
next_commit_ID++;
continue;