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jbd2: checksum data blocks that are stored in the journal

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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>
This commit is contained in:
Darrick J. Wong
2012-05-27 08:12:12 -04:00
committed by Theodore Ts'o
parent 1f56c5890e
commit c390087591
3 changed files with 60 additions and 2 deletions
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22
fs/jbd2/commit.c
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@@ -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;