+static void fix_read_error(conf_t *conf, int read_disk,
+ sector_t sect, int sectors)
+{
+ mddev_t *mddev = conf->mddev;
+ while(sectors) {
+ int s = sectors;
+ int d = read_disk;
+ int success = 0;
+ int start;
+ mdk_rdev_t *rdev;
+
+ if (s > (PAGE_SIZE>>9))
+ s = PAGE_SIZE >> 9;
+
+ do {
+ /* Note: no rcu protection needed here
+ * as this is synchronous in the raid1d thread
+ * which is the thread that might remove
+ * a device. If raid1d ever becomes multi-threaded....
+ */
+ rdev = conf->mirrors[d].rdev;
+ if (rdev &&
+ test_bit(In_sync, &rdev->flags) &&
+ sync_page_io(rdev->bdev,
+ sect + rdev->data_offset,
+ s<<9,
+ conf->tmppage, READ))
+ success = 1;
+ else {
+ d++;
+ if (d == conf->raid_disks)
+ d = 0;
+ }
+ } while (!success && d != read_disk);
+
+ if (!success) {
+ /* Cannot read from anywhere -- bye bye array */
+ md_error(mddev, conf->mirrors[read_disk].rdev);
+ break;
+ }
+ /* write it back and re-read */
+ start = d;
+ while (d != read_disk) {
+ if (d==0)
+ d = conf->raid_disks;
+ d--;
+ rdev = conf->mirrors[d].rdev;
+ if (rdev &&
+ test_bit(In_sync, &rdev->flags)) {
+ if (sync_page_io(rdev->bdev,
+ sect + rdev->data_offset,
+ s<<9, conf->tmppage, WRITE)
+ == 0)
+ /* Well, this device is dead */
+ md_error(mddev, rdev);
+ }
+ }
+ d = start;
+ while (d != read_disk) {
+ char b[BDEVNAME_SIZE];
+ if (d==0)
+ d = conf->raid_disks;
+ d--;
+ rdev = conf->mirrors[d].rdev;
+ if (rdev &&
+ test_bit(In_sync, &rdev->flags)) {
+ if (sync_page_io(rdev->bdev,
+ sect + rdev->data_offset,
+ s<<9, conf->tmppage, READ)
+ == 0)
+ /* Well, this device is dead */
+ md_error(mddev, rdev);
+ else {
+ atomic_add(s, &rdev->corrected_errors);
+ printk(KERN_INFO
+ "raid1:%s: read error corrected "
+ "(%d sectors at %llu on %s)\n",
+ mdname(mddev), s,
+ (unsigned long long)(sect +
+ rdev->data_offset),
+ bdevname(rdev->bdev, b));
+ }
+ }
+ }
+ sectors -= s;
+ sect += s;
+ }
+}
+