diff options
Diffstat (limited to 'drivers/md/raid1.c')
| -rw-r--r-- | drivers/md/raid1.c | 173 |
1 files changed, 95 insertions, 78 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 2817c477302d..13b59e6a6acb 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1368,6 +1368,95 @@ static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) * 3. Performs writes following reads for array syncronising. */ +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; + } +} + static void raid1d(mddev_t *mddev) { r1bio_t *r1_bio; @@ -1460,86 +1549,14 @@ static void raid1d(mddev_t *mddev) * This is all done synchronously while the array is * frozen */ - sector_t sect = r1_bio->sector; - int sectors = r1_bio->sectors; - freeze_array(conf); - if (mddev->ro == 0) while(sectors) { - int s = sectors; - int d = r1_bio->read_disk; - int success = 0; - - 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 != r1_bio->read_disk); - - if (success) { - /* write it back and re-read */ - int start = d; - while (d != r1_bio->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 != r1_bio->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, 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)); - } - } - } - } else { - /* Cannot read from anywhere -- bye bye array */ - md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); - break; - } - sectors -= s; - sect += s; + if (mddev->ro == 0) { + freeze_array(conf); + fix_read_error(conf, r1_bio->read_disk, + r1_bio->sector, + r1_bio->sectors); + unfreeze_array(conf); } - unfreeze_array(conf); - bio = r1_bio->bios[r1_bio->read_disk]; if ((disk=read_balance(conf, r1_bio)) == -1) { printk(KERN_ALERT "raid1: %s: unrecoverable I/O" |