/**
* Create a logpack.
*
* @logh_sectdp pointer to sector data pointer
* for logpack header (will be set).
* @logd_sect_aryp pointer to sector data array pointer
* for logpack data (will be set).
* @pbs physical block size [byte].
* @bufsize buffer size for log data [byte].
*
* RETURN:
* allocated logpack in success, or NULL.
*/
struct logpack *alloc_logpack(
unsigned int pbs, unsigned int n_sectors)
{
struct logpack *pack;
ASSERT(is_valid_pbs(pbs));
ASSERT(0 < n_sectors);
pack = (struct logpack *)malloc(sizeof(*pack));
if (!pack) { goto error1; }
memset(pack, 0, sizeof(*pack));
/* Buffer for logpack header. */
pack->sectd = sector_alloc(pbs);
if (!pack->sectd) { goto error1; }
pack->header = get_logpack_header(pack->sectd);
/* Buffer for logpack data. */
pack->sectd_ary = sector_array_alloc(pbs, n_sectors);
if (!pack->sectd_ary) { goto error1; }
return pack;
error1:
LOGe("Memory allocation failure.\n");
free_logpack(pack);
return NULL;
}
/**
* Read logpack header sector from log device.
*
* @fd log device fd opened.
* @super_sectp super sector.
* @lsid logpack lsid to read.
* @logh_sect buffer to store logpack header data.
* This allocated size must be sector size.
* @salt log checksum salt.
*
* RETURN:
* ture in success, or false.
*/
bool read_logpack_header_from_wldev(
int fd, const struct walb_super_sector* super_sectp,
u64 lsid, u32 salt, struct sector_data *logh_sect)
{
/* calc offset in the ring buffer */
u64 ring_buffer_offset = get_ring_buffer_offset_2(super_sectp);
u64 ring_buffer_size = super_sectp->ring_buffer_size;
u64 off = ring_buffer_offset + lsid % ring_buffer_size;
struct walb_logpack_header *logh = get_logpack_header(logh_sect);
/* read sector */
if (!sector_read(fd, off, logh_sect)) {
LOGe("read logpack header (lsid %"PRIu64") failed.\n", lsid);
return false;
}
/* check lsid */
if (lsid != logh->logpack_lsid) {
LOGe("lsid (given %"PRIu64" read %"PRIu64") is invalid.\n",
lsid, logh->logpack_lsid);
return false;
}
if (!is_valid_logpack_header_with_checksum(
logh, super_sectp->physical_bs, salt)) {
LOGe("check logpack header failed.\n");
return false;
}
return true;
}
/**
* Check logpack of the given lsid exists.
*
* @lsid lsid to check.
*
* @return Non-zero if valid, or 0.
*/
int walb_check_lsid_valid(struct walb_dev *wdev, u64 lsid)
{
struct sector_data *sect;
struct walb_logpack_header *logh;
u64 off;
ASSERT(wdev);
sect = sector_alloc(wdev->physical_bs, GFP_NOIO);
if (!sect) {
LOGe("walb_check_lsid_valid: alloc sector failed.\n");
goto error0;
}
ASSERT(is_same_size_sector(sect, wdev->lsuper0));
logh = get_logpack_header(sect);
spin_lock(&wdev->lsuper0_lock);
off = get_offset_of_lsid_2(get_super_sector(wdev->lsuper0), lsid);
spin_unlock(&wdev->lsuper0_lock);
if (!sector_io(READ, wdev->ldev, off, sect)) {
LOGe("walb_check_lsid_valid: read sector failed.\n");
goto error1;
}
/* Check valid logpack header. */
if (!is_valid_logpack_header_with_checksum(
logh, wdev->physical_bs, wdev->log_checksum_salt)) {
goto error1;
}
/* Check lsid. */
if (logh->logpack_lsid != lsid) {
goto error1;
}
sector_free(sect);
return 1;
error1:
sector_free(sect);
error0:
return 0;
}
/**
* Write an end logpack header block.
*/
bool write_end_logpack_header(int fd, unsigned int pbs, u32 salt)
{
bool ret = false;
struct walb_logpack_header *h;
struct sector_data *sect = sector_alloc(pbs);
if (!sect) {
LOGe("sector_alloc failed.\n");
return false;
}
h = get_logpack_header(sect);
memset(h, 0, pbs);
h->sector_type = SECTOR_TYPE_LOGPACK;
h->n_records = 0;
h->logpack_lsid = (u64)(-1);
h->checksum = 0;
h->checksum = checksum((const u8 *)h, pbs, salt);
ret = write_data(fd, (const u8 *)h, pbs);
if (!ret) LOGe("write_data failed.\n");
sector_free(sect);
return ret;
}