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| author | Darrick J. Wong <djwong@us.ibm.com> | 2012-05-27 08:12:12 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-05-27 08:12:12 -0400 |
| commit | c390087591dcbecd244c31d979ccdad49ae83364 (patch) | |
| tree | c3ccbd028cb7970070114a8b0f45adfbebb113cb /fs/jbd2/commit.c | |
| parent | 1f56c5890e3e815c6f4eabfc87a8a81f439b6f3d (diff) | |
| download | linux-c390087591dcbecd244c31d979ccdad49ae83364.tar.bz2 | |
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/commit.c')
| -rw-r--r-- | fs/jbd2/commit.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c index 16e1fe2a769f..216f4299f65e 100644 --- a/fs/jbd2/commit.c +++ b/fs/jbd2/commit.c @@ -338,6 +338,26 @@ static void jbd2_descr_block_csum_set(journal_t *j, tail->t_checksum = cpu_to_be32(csum); } +static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, + struct buffer_head *bh, __u32 sequence) +{ + struct page *page = bh->b_page; + __u8 *addr; + __u32 csum; + + if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) + return; + + sequence = cpu_to_be32(sequence); + addr = kmap_atomic(page, KM_USER0); + csum = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence, + sizeof(sequence)); + csum = jbd2_chksum(j, csum, addr + offset_in_page(bh->b_data), + bh->b_size); + kunmap_atomic(addr, KM_USER0); + + tag->t_checksum = cpu_to_be32(csum); +} /* * jbd2_journal_commit_transaction * @@ -669,6 +689,8 @@ void jbd2_journal_commit_transaction(journal_t *journal) tag = (journal_block_tag_t *) tagp; write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); tag->t_flags = cpu_to_be16(tag_flag); + jbd2_block_tag_csum_set(journal, tag, jh2bh(new_jh), + commit_transaction->t_tid); tagp += tag_bytes; space_left -= tag_bytes; |