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| author | Darrick J. Wong <djwong@us.ibm.com> | 2012-05-27 16:12:12 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-05-27 16:12:12 +0400 |
| commit | c390087591dcbecd244c31d979ccdad49ae83364 (patch) | |
| tree | c3ccbd028cb7970070114a8b0f45adfbebb113cb /fs/jbd2/recovery.c | |
| parent | 1f56c5890e3e815c6f4eabfc87a8a81f439b6f3d (diff) | |
| download | linux-c390087591dcbecd244c31d979ccdad49ae83364.tar.xz | |
jbd2: checksum data blocks that are stored in the journal
Calculate and verify checksums of each data block being stored in the journal.
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.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c index df4a20e7d854..0131e4362534 100644 --- a/fs/jbd2/recovery.c +++ b/fs/jbd2/recovery.c @@ -393,6 +393,23 @@ static int jbd2_commit_block_csum_verify(journal_t *j, void *buf) return provided == calculated; } +static int jbd2_block_tag_csum_verify(journal_t *j, journal_block_tag_t *tag, + void *buf, __u32 sequence) +{ + __u32 provided, calculated; + + if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) + return 1; + + sequence = cpu_to_be32(sequence); + calculated = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence, + sizeof(sequence)); + calculated = jbd2_chksum(j, calculated, buf, j->j_blocksize); + provided = be32_to_cpu(tag->t_checksum); + + return provided == cpu_to_be32(calculated); +} + static int do_one_pass(journal_t *journal, struct recovery_info *info, enum passtype pass) { @@ -569,6 +586,19 @@ static int do_one_pass(journal_t *journal, goto skip_write; } + /* Look for block corruption */ + if (!jbd2_block_tag_csum_verify( + journal, tag, obh->b_data, + be32_to_cpu(tmp->h_sequence))) { + brelse(obh); + success = -EIO; + printk(KERN_ERR "JBD: Invalid " + "checksum recovering " + "block %llu in log\n", + blocknr); + continue; + } + /* Find a buffer for the new * data being restored */ nbh = __getblk(journal->j_fs_dev, |