+int process_ubb(struct active_array *a, struct mdinfo *mdi, const unsigned long
+ long sector, const int length, const char *buf,
+ const int buf_len)
+{
+ struct superswitch *ss = a->container->ss;
+
+ /*
+ * record bad block in metadata first, then acknowledge it to the driver
+ * via sysfs file
+ */
+ if ((ss->record_bad_block(a, mdi->disk.raid_disk, sector, length)) &&
+ (write(mdi->bb_fd, buf, buf_len) == buf_len))
+ return 1;
+
+ /*
+ * failed to store or acknowledge bad block, switch of bad block support
+ * to get it out of blocked state
+ */
+ sysfs_set_str(&a->info, mdi, "state", "-external_bbl");
+ return -1;
+}
+
+int compare_bb(struct active_array *a, struct mdinfo *mdi, const unsigned long
+ long sector, const unsigned int length, void *arg)
+{
+ struct superswitch *ss = a->container->ss;
+ struct md_bb *bb = (struct md_bb *) arg;
+ int record = 1;
+ int i;
+
+ for (i = 0; i < bb->count; i++) {
+ unsigned long long start = bb->entries[i].sector;
+ unsigned long long len = bb->entries[i].length;
+
+ /*
+ * bad block in metadata exactly matches bad block in kernel
+ * list, just remove it from a list
+ */
+ if ((start == sector) && (len == length)) {
+ if (i < bb->count - 1)
+ bb->entries[i] = bb->entries[bb->count - 1];
+ bb->count -= 1;
+ record = 0;
+ break;
+ }
+ /*
+ * bad block in metadata spans bad block in kernel list,
+ * clear it and record new bad block
+ */
+ if ((sector >= start) && (sector + length <= start + len)) {
+ ss->clear_bad_block(a, mdi->disk.raid_disk, start, len);
+ break;
+ }
+ }
+
+ /* record all bad blocks not in metadata list */
+ if (record && (ss->record_bad_block(a, mdi->disk.raid_disk, sector,
+ length) <= 0)) {
+ sysfs_set_str(&a->info, mdi, "state", "-external_bbl");
+ return -1;
+ }
+
+ return 1;
+}
+
+static int read_bb_file(int fd, struct active_array *a, struct mdinfo *mdi,
+ enum bb_action action, void *arg)
+{
+ char buf[30];
+ int n = 0;
+ int ret = 0;
+ int read_again = 0;
+ int off = 0;
+ int pos = 0;
+ int preserve_pos = (action == RECORD_BB ? 0 : 1);
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
+ return -1;
+
+ do {
+ read_again = 0;
+ n = read(fd, buf + pos, sizeof(buf) - 1 - pos);
+ if (n < 0)
+ return -1;
+ n += pos;
+
+ buf[n] = '\0';
+ off = 0;
+
+ while (off < n) {
+ unsigned long long sector;
+ int length;
+ char newline;
+ int consumed;
+ int matched;
+ int rc;
+
+ /* kernel sysfs file format: "sector length\n" */
+ matched = sscanf(buf + off, "%llu %d%c%n", §or,
+ &length, &newline, &consumed);
+ if ((matched != 3) && (off > 0)) {
+ /* truncated entry, read again */
+ if (preserve_pos) {
+ pos = sizeof(buf) - off - 1;
+ memmove(buf, buf + off, pos);
+ } else {
+ if (lseek(fd, 0, SEEK_SET) ==
+ (off_t) -1)
+ return -1;
+ }
+ read_again = 1;
+ break;
+ }
+ if (matched != 3)
+ return -1;
+ if (newline != '\n')
+ return -1;
+ if (length <= 0)
+ return -1;
+
+ if (action == RECORD_BB)
+ rc = process_ubb(a, mdi, sector, length,
+ buf + off, consumed);
+ else if (action == COMPARE_BB)
+ rc = compare_bb(a, mdi, sector, length, arg);
+ else
+ rc = -1;
+
+ if (rc < 0)
+ return rc;
+ ret += rc;
+ off += consumed;
+ }
+ } while (read_again);
+
+ return ret;
+}
+
+static int process_dev_ubb(struct active_array *a, struct mdinfo *mdi)
+{
+ return read_bb_file(mdi->ubb_fd, a, mdi, RECORD_BB, NULL);
+}
+
+static int check_for_cleared_bb(struct active_array *a, struct mdinfo *mdi)
+{
+ struct superswitch *ss = a->container->ss;
+ struct md_bb *bb;
+ int i;
+
+ if (!ss->get_bad_blocks)
+ return -1;
+
+ /*
+ * Get a list of bad blocks for an array, then read list of
+ * acknowledged bad blocks from kernel and compare it against metadata
+ * list, clear all bad blocks remaining in metadata list
+ */
+ bb = ss->get_bad_blocks(a, mdi->disk.raid_disk);
+ if (!bb)
+ return -1;
+
+ if (read_bb_file(mdi->bb_fd, a, mdi, COMPARE_BB, bb) < 0)
+ return -1;
+
+ for (i = 0; i < bb->count; i++) {
+ unsigned long long sector = bb->entries[i].sector;
+ int length = bb->entries[i].length;
+
+ ss->clear_bad_block(a, mdi->disk.raid_disk, sector, length);
+ }
+
+ return 0;
+}
+