+__u32 crc32c_le(__u32 crc, unsigned char const *p, size_t len);
+
+static int write_init_ppl_imsm(struct supertype *st, struct mdinfo *info, int fd)
+{
+ struct intel_super *super = st->sb;
+ void *buf;
+ struct ppl_header *ppl_hdr;
+ int ret;
+
+ /* first clear entire ppl space */
+ ret = zero_disk_range(fd, info->ppl_sector, info->ppl_size);
+ if (ret)
+ return ret;
+
+ ret = posix_memalign(&buf, MAX_SECTOR_SIZE, PPL_HEADER_SIZE);
+ if (ret) {
+ pr_err("Failed to allocate PPL header buffer\n");
+ return ret;
+ }
+
+ memset(buf, 0, PPL_HEADER_SIZE);
+ ppl_hdr = buf;
+ memset(ppl_hdr->reserved, 0xff, PPL_HDR_RESERVED);
+ ppl_hdr->signature = __cpu_to_le32(super->anchor->orig_family_num);
+
+ if (info->mismatch_cnt) {
+ /*
+ * We are overwriting an invalid ppl. Make one entry with wrong
+ * checksum to prevent the kernel from skipping resync.
+ */
+ ppl_hdr->entries_count = __cpu_to_le32(1);
+ ppl_hdr->entries[0].checksum = ~0;
+ }
+
+ ppl_hdr->checksum = __cpu_to_le32(~crc32c_le(~0, buf, PPL_HEADER_SIZE));
+
+ if (lseek64(fd, info->ppl_sector * 512, SEEK_SET) < 0) {
+ ret = errno;
+ perror("Failed to seek to PPL header location");
+ }
+
+ if (!ret && write(fd, buf, PPL_HEADER_SIZE) != PPL_HEADER_SIZE) {
+ ret = errno;
+ perror("Write PPL header failed");
+ }
+
+ if (!ret)
+ fsync(fd);
+
+ free(buf);
+ return ret;
+}
+
+static int validate_ppl_imsm(struct supertype *st, struct mdinfo *info,
+ struct mdinfo *disk)
+{
+ struct intel_super *super = st->sb;
+ struct dl *d;
+ void *buf;
+ int ret = 0;
+ struct ppl_header *ppl_hdr;
+ __u32 crc;
+ struct imsm_dev *dev;
+ struct imsm_map *map;
+ __u32 idx;
+ unsigned int i;
+ unsigned long long ppl_offset = 0;
+ unsigned long long prev_gen_num = 0;
+
+ if (disk->disk.raid_disk < 0)
+ return 0;
+
+ if (posix_memalign(&buf, MAX_SECTOR_SIZE, PPL_HEADER_SIZE)) {
+ pr_err("Failed to allocate PPL header buffer\n");
+ return -1;
+ }
+
+ dev = get_imsm_dev(super, info->container_member);
+ map = get_imsm_map(dev, MAP_X);
+ idx = get_imsm_disk_idx(dev, disk->disk.raid_disk, MAP_X);
+ d = get_imsm_dl_disk(super, idx);
+
+ if (!d || d->index < 0 || is_failed(&d->disk))
+ goto out;
+
+ ret = 1;
+ while (ppl_offset < MULTIPLE_PPL_AREA_SIZE_IMSM) {
+ dprintf("Checking potential PPL at offset: %llu\n", ppl_offset);
+
+ if (lseek64(d->fd, info->ppl_sector * 512 + ppl_offset,
+ SEEK_SET) < 0) {
+ perror("Failed to seek to PPL header location");
+ ret = -1;
+ goto out;
+ }
+
+ if (read(d->fd, buf, PPL_HEADER_SIZE) != PPL_HEADER_SIZE) {
+ perror("Read PPL header failed");
+ ret = -1;
+ goto out;
+ }
+
+ ppl_hdr = buf;
+
+ crc = __le32_to_cpu(ppl_hdr->checksum);
+ ppl_hdr->checksum = 0;
+
+ if (crc != ~crc32c_le(~0, buf, PPL_HEADER_SIZE)) {
+ dprintf("Wrong PPL header checksum on %s\n",
+ d->devname);
+ goto out;
+ }
+
+ if (prev_gen_num > __le64_to_cpu(ppl_hdr->generation)) {
+ /* previous was newest, it was already checked */
+ goto out;
+ }
+
+ if ((__le32_to_cpu(ppl_hdr->signature) !=
+ super->anchor->orig_family_num)) {
+ dprintf("Wrong PPL header signature on %s\n",
+ d->devname);
+ ret = 1;
+ goto out;
+ }
+
+ ret = 0;
+ prev_gen_num = __le64_to_cpu(ppl_hdr->generation);
+
+ ppl_offset += PPL_HEADER_SIZE;
+ for (i = 0; i < __le32_to_cpu(ppl_hdr->entries_count); i++)
+ ppl_offset +=
+ __le32_to_cpu(ppl_hdr->entries[i].pp_size);
+ }
+
+out:
+ free(buf);
+
+ /*
+ * Update metadata to use mutliple PPLs area (1MB).
+ * This is done once for all RAID members
+ */
+ if (info->consistency_policy == CONSISTENCY_POLICY_PPL &&
+ info->ppl_size != (MULTIPLE_PPL_AREA_SIZE_IMSM >> 9)) {
+ char subarray[20];
+ struct mdinfo *member_dev;
+
+ sprintf(subarray, "%d", info->container_member);
+
+ if (mdmon_running(st->container_devnm))
+ st->update_tail = &st->updates;
+
+ if (st->ss->update_subarray(st, subarray, "ppl", NULL)) {
+ pr_err("Failed to update subarray %s\n",
+ subarray);
+ } else {
+ if (st->update_tail)
+ flush_metadata_updates(st);
+ else
+ st->ss->sync_metadata(st);
+ info->ppl_size = (MULTIPLE_PPL_AREA_SIZE_IMSM >> 9);
+ for (member_dev = info->devs; member_dev;
+ member_dev = member_dev->next)
+ member_dev->ppl_size =
+ (MULTIPLE_PPL_AREA_SIZE_IMSM >> 9);
+ }
+ }
+
+ if (ret == 1) {
+ if (map->map_state == IMSM_T_STATE_UNINITIALIZED ||
+ (map->map_state == IMSM_T_STATE_NORMAL &&
+ !(dev->vol.dirty & RAIDVOL_DIRTY)))
+ ret = st->ss->write_init_ppl(st, info, d->fd);
+ else
+ info->mismatch_cnt++;
+ }
+
+ return ret;
+}
+
+static int write_init_ppl_imsm_all(struct supertype *st, struct mdinfo *info)
+{
+ struct intel_super *super = st->sb;
+ struct dl *d;
+ int ret = 0;
+
+ if (info->consistency_policy != CONSISTENCY_POLICY_PPL ||
+ info->array.level != 5)
+ return 0;
+
+ for (d = super->disks; d ; d = d->next) {
+ if (d->index < 0 || is_failed(&d->disk))
+ continue;
+
+ ret = st->ss->write_init_ppl(st, info, d->fd);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+