/**
* Shrink logpack header.
*
* @logh logpack header to shrink.
* @invalid_idx new logpack header's n_records must be invalid_idx.
* @pbs physical block size [byte].
* @salt checksum salt.
*/
void shrink_logpack_header(
struct walb_logpack_header *logh, unsigned int invalid_idx,
unsigned int pbs, u32 salt)
{
unsigned int i;
/* Invalidate records. */
ASSERT(invalid_idx < logh->n_records);
for (i = invalid_idx; i < logh->n_records; i++) {
log_record_init(&logh->record[i]);
}
/* Set n_records, n_padding, and total_io_size. */
logh->n_records = invalid_idx;
logh->n_padding = 0;
logh->total_io_size = 0;
for (i = 0; i < invalid_idx; i++) {
const struct walb_log_record *rec = &logh->record[i];
if (!test_bit_u32(LOG_RECORD_DISCARD, &rec->flags)) {
logh->total_io_size += capacity_pb(pbs, rec->io_size);
}
if (test_bit_u32(LOG_RECORD_PADDING, &rec->flags)) {
logh->n_padding++;
}
}
/* Calculate checksum. */
logh->checksum = 0;
logh->checksum = checksum((const u8 *)logh, pbs, salt);
ASSERT(is_valid_logpack_header_with_checksum(logh, pbs, salt));
}
/**
* Redo logpack.
*
* @fd file descriptor of data device (opened).
* @logpack logpack header to be redo.
* @buf logpack data.
* (data size: logh->total_io_size * physical_bs)
*
* RETURN:
* true in success, or false.
*/
bool redo_logpack(
int fd,
const struct walb_logpack_header* logh,
const struct sector_data_array *sect_ary)
{
int i, n_req;
ASSERT(logh);
ASSERT_SECTOR_DATA_ARRAY(sect_ary);
n_req = logh->n_records;
for (i = 0; i < n_req; i++) {
unsigned int idx_lb, n_lb;
u64 off_lb;
const struct walb_log_record *rec = &logh->record[i];
if (test_bit_u32(LOG_RECORD_PADDING, &rec->flags)) {
continue;
}
off_lb = rec->offset;
idx_lb = addr_lb(sect_ary->sector_size, rec->lsid_local - 1);
n_lb = rec->io_size;
if (test_bit_u32(LOG_RECORD_DISCARD, &rec->flags)) {
/* If the data device supports discard request,
you must issue discard requests. */
/* now editing */
continue;
}
if (!sector_array_pwrite_lb(fd, off_lb, sect_ary, idx_lb, n_lb)) {
LOGe("write sectors failed.\n");
return false;
}
}
return true;
}
/**
* Read a logpack data from a stream.
*
* @fd file descriptor (opened, seeked)
* @logh corresponding logpack header.
* @salt checksum salt.
* @sect_ary sector data array to be store data.
*
* RETURN:
* true in success, or false.
*/
bool read_logpack_data(
int fd,
const struct walb_logpack_header* logh, u32 salt,
struct sector_data_array *sect_ary)
{
unsigned int pbs;
u32 total_pb;
int i;
int n_req;
ASSERT(fd >= 0);
ASSERT(logh);
n_req = logh->n_records;
ASSERT_SECTOR_DATA_ARRAY(sect_ary);
pbs = sect_ary->sector_size;
ASSERT_PBS(pbs);
if (logh->total_io_size > sect_ary->size) {
LOGe("sect_ary size is not enough.\n");
return false;
}
total_pb = 0;
for (i = 0; i < n_req; i++) {
unsigned int idx_pb, log_lb, log_pb;
u32 csum;
const struct walb_log_record *rec = &logh->record[i];
if (test_bit_u32(LOG_RECORD_DISCARD, &rec->flags)) {
continue;
}
idx_pb = rec->lsid_local - 1;
log_lb = rec->io_size;
log_pb = capacity_pb(pbs, log_lb);
/* Read data of the log record. */
if (!sector_array_read(fd, sect_ary, idx_pb, log_pb)) {
LOGe("read log data failed.\n");
return false;
}
if (test_bit_u32(LOG_RECORD_PADDING, &rec->flags)) {
total_pb += log_pb;
continue;
}
/* Confirm checksum. */
csum = sector_array_checksum(
sect_ary,
idx_pb * pbs,
log_lb * LOGICAL_BLOCK_SIZE, salt);
if (csum != rec->checksum) {
LOGe("log record[%d] checksum is invalid. %08x %08x\n",
i, csum, rec->checksum);
return false;
}
total_pb += log_pb;
}
ASSERT(total_pb == logh->total_io_size);
return true;
}
/**
* Debug print of logpack header.
*
*/
void walb_logpack_header_print(
const char *level, const struct walb_logpack_header *lhead)
{
int i;
printk("%s*****logpack header*****\n"
"checksum: %08x\n"
"n_records: %u\n"
"n_padding: %u\n"
"total_io_size: %u\n"
"logpack_lsid: %"PRIu64"\n",
level,
lhead->checksum,
lhead->n_records,
lhead->n_padding,
lhead->total_io_size,
lhead->logpack_lsid);
for (i = 0; i < lhead->n_records; i++) {
printk("%srecord %d\n"
" checksum: %08x\n"
" lsid: %llu\n"
" lsid_local: %u\n"
" is_exist: %u\n"
" is_padding: %u\n"
" is_discard: %u\n"
" offset: %"PRIu64"\n"
" io_size: %u\n",
level, i,
lhead->record[i].checksum,
lhead->record[i].lsid,
lhead->record[i].lsid_local,
test_bit_u32(LOG_RECORD_EXIST, &lhead->record[i].flags),
test_bit_u32(LOG_RECORD_PADDING, &lhead->record[i].flags),
test_bit_u32(LOG_RECORD_DISCARD, &lhead->record[i].flags),
lhead->record[i].offset,
lhead->record[i].io_size);
printk("%slogpack lsid: %llu\n", level,
lhead->record[i].lsid - lhead->record[i].lsid_local);
}
}
/**
* Print logpack header.
*
* @loghk log pack header.
*/
void print_logpack_header(const struct walb_logpack_header* logh)
{
ASSERT(logh);
int i;
printf("*****logpack header*****\n"
"checksum: %08x\n"
"n_records: %u\n"
"n_padding: %u\n"
"total_io_size: %u\n"
"logpack_lsid: %"PRIu64"\n",
logh->checksum,
logh->n_records,
logh->n_padding,
logh->total_io_size,
logh->logpack_lsid);
for (i = 0; i < logh->n_records; i++) {
printf("record %d\n"
" checksum: %08x\n"
" lsid: %"PRIu64"\n"
" lsid_local: %u\n"
" is_exist: %u\n"
" is_padding: %u\n"
" is_discard: %u\n"
" offset: %"PRIu64"\n"
" io_size: %u\n",
i,
logh->record[i].checksum,
logh->record[i].lsid,
logh->record[i].lsid_local,
test_bit_u32(LOG_RECORD_EXIST, &logh->record[i].flags),
test_bit_u32(LOG_RECORD_PADDING, &logh->record[i].flags),
test_bit_u32(LOG_RECORD_DISCARD, &logh->record[i].flags),
logh->record[i].offset,
logh->record[i].io_size);
printf("logpack lsid: %"PRIu64"\n",
logh->record[i].lsid - logh->record[i].lsid_local);
}
}
/**
* Get total size of padding data in a logpack header.
*
* RETURN:
* total padding size [physical block].
*/
unsigned int get_padding_size_in_logpack_header(
const struct walb_logpack_header *logh, unsigned int pbs)
{
unsigned int total_padding_size = 0;
const struct walb_log_record *rec;
int i;
for_each_logpack_record(i, rec, logh) {
if (test_bit_u32(LOG_RECORD_PADDING, &rec->flags)) {
total_padding_size += capacity_pb(pbs, rec->io_size);
}
}
return total_padding_size;
}
/**
* Read logpack data.
* Padding area will be also read.
*
* @fd file descriptor of log device.
* @super super sector.
* @logh logpack header.
* @salt checksum salt.
* @sect_ary sector array.
*
* RETURN:
* index of invalid record found at first.
* logh->n_records if the whole logpack is valid.
*/
unsigned int read_logpack_data_from_wldev(
int fd,
const struct walb_super_sector* super,
const struct walb_logpack_header* logh, u32 salt,
struct sector_data_array *sect_ary)
{
const int lbs = super->logical_bs;
const int pbs = super->physical_bs;
int i;
int total_pb;
ASSERT(lbs == LOGICAL_BLOCK_SIZE);
ASSERT_PBS(pbs);
if (logh->total_io_size > sect_ary->size) {
LOGe("buffer size is not enough.\n");
return false;
}
total_pb = 0;
for (i = 0; i < logh->n_records; i++) {
u64 log_off;
u32 log_lb, log_pb;
if (test_bit_u32(LOG_RECORD_DISCARD, &logh->record[i].flags)) {
continue;
}
log_lb = logh->record[i].io_size;
log_pb = capacity_pb(pbs, log_lb);
log_off = get_offset_of_lsid_2
(super, logh->record[i].lsid);
LOGd_("lsid: %"PRIu64" log_off: %"PRIu64"\n",
logh->record[i].lsid,
log_off);
/* Read data for the log record. */
if (!sector_array_pread(
fd, log_off, sect_ary,
total_pb, log_pb)) {
LOGe("read sectors failed.\n");
return i;
}
if (test_bit_u32(LOG_RECORD_PADDING, &logh->record[i].flags)) {
total_pb += log_pb;
continue;
}
/* Confirm checksum */
u32 csum = sector_array_checksum(
sect_ary, total_pb * pbs,
log_lb * lbs, salt);
if (csum != logh->record[i].checksum) {
LOGe("log header checksum is invalid. %08x %08x\n",
csum, logh->record[i].checksum);
return i;
}
total_pb += log_pb;
}
ASSERT(i == logh->n_records);
return logh->n_records;
}