/*
* calc_chksums calculates the checksums for the blocks described in the
* descriptor block.
*/
static int calc_chksums(journal_t *journal, struct buffer_head *bh,
unsigned long long *next_log_block, __u32 *crc32_sum)
{
int i, num_blks, err;
unsigned long long io_block;
struct buffer_head *obh;
num_blks = count_tags(journal, bh);
/* Calculate checksum of the descriptor block. */
*crc32_sum = ext2fs_crc32_be(*crc32_sum, (void *)bh->b_data,
bh->b_size);
for (i = 0; i < num_blks; i++) {
io_block = (*next_log_block)++;
wrap(journal, *next_log_block);
err = jread(&obh, journal, io_block);
if (err) {
printk(KERN_ERR "JBD: IO error %d recovering block "
"%llu in log\n", err, io_block);
return 1;
} else {
*crc32_sum = ext2fs_crc32_be(*crc32_sum,
(void *)obh->b_data,
obh->b_size);
}
brelse(obh);
}
return 0;
}
static errcode_t journal_commit_trans(journal_transaction_t *trans)
{
struct buffer_head *bh, *cbh = NULL;
struct commit_header *commit;
#ifdef HAVE_SYS_TIME_H
struct timeval tv;
#endif
errcode_t err;
JOURNAL_CHECK_TRANS_MAGIC(trans);
if ((trans->flags & J_TRANS_COMMITTED) ||
!(trans->flags & J_TRANS_OPEN))
return EXT2_ET_INVALID_ARGUMENT;
bh = getblk(trans->journal->j_dev, 0, trans->journal->j_blocksize);
if (bh == NULL)
return ENOMEM;
/* write the descriptor block header */
commit = (struct commit_header *)bh->b_data;
commit->h_magic = ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER);
commit->h_blocktype = ext2fs_cpu_to_be32(JFS_COMMIT_BLOCK);
commit->h_sequence = ext2fs_cpu_to_be32(trans->tid);
if (JFS_HAS_COMPAT_FEATURE(trans->journal,
JFS_FEATURE_COMPAT_CHECKSUM)) {
__u32 csum_v1 = ~0;
blk64_t cblk;
cbh = getblk(trans->journal->j_dev, 0,
trans->journal->j_blocksize);
if (cbh == NULL) {
err = ENOMEM;
goto error;
}
for (cblk = trans->start; cblk < trans->block; cblk++) {
err = journal_bmap(trans->journal, cblk,
&cbh->b_blocknr);
if (err)
goto error;
mark_buffer_uptodate(cbh, 0);
ll_rw_block(READ, 1, &cbh);
err = cbh->b_err;
if (err)
goto error;
csum_v1 = ext2fs_crc32_be(csum_v1,
(unsigned char const *)cbh->b_data,
cbh->b_size);
}
commit->h_chksum_type = JFS_CRC32_CHKSUM;
commit->h_chksum_size = JFS_CRC32_CHKSUM_SIZE;
commit->h_chksum[0] = ext2fs_cpu_to_be32(csum_v1);
} else {
commit->h_chksum_type = 0;
commit->h_chksum_size = 0;
commit->h_chksum[0] = 0;
}
#ifdef HAVE_SYS_TIME_H
gettimeofday(&tv, NULL);
commit->h_commit_sec = ext2fs_cpu_to_be32(tv.tv_sec);
commit->h_commit_nsec = ext2fs_cpu_to_be32(tv.tv_usec * 1000);
#else
commit->h_commit_sec = 0;
commit->h_commit_nsec = 0;
#endif
/* Write block */
jbd2_commit_block_csum_set(trans->journal, bh);
err = journal_bmap(trans->journal, trans->block, &bh->b_blocknr);
if (err)
goto error;
dbg_printf("Writing commit block at %llu:%llu\n", trans->block,
bh->b_blocknr);
mark_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
err = bh->b_err;
if (err)
goto error;
trans->flags |= J_TRANS_COMMITTED;
trans->flags &= ~J_TRANS_OPEN;
trans->block++;
trans->fs->super->s_feature_incompat |= EXT3_FEATURE_INCOMPAT_RECOVER;
ext2fs_mark_super_dirty(trans->fs);
error:
if (cbh)
brelse(cbh);
brelse(bh);
return err;
}
