diff options
Diffstat (limited to 'drivers/md')
-rw-r--r-- | drivers/md/raid10.c | 118 |
1 files changed, 67 insertions, 51 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index f2ec44fda1a0..4ad8447fa868 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1275,12 +1275,75 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio, } } +static void wait_blocked_dev(struct mddev *mddev, struct r10bio *r10_bio) +{ + int i; + struct r10conf *conf = mddev->private; + struct md_rdev *blocked_rdev; + +retry_wait: + blocked_rdev = NULL; + rcu_read_lock(); + for (i = 0; i < conf->copies; i++) { + struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); + struct md_rdev *rrdev = rcu_dereference( + conf->mirrors[i].replacement); + if (rdev == rrdev) + rrdev = NULL; + if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { + atomic_inc(&rdev->nr_pending); + blocked_rdev = rdev; + break; + } + if (rrdev && unlikely(test_bit(Blocked, &rrdev->flags))) { + atomic_inc(&rrdev->nr_pending); + blocked_rdev = rrdev; + break; + } + + if (rdev && test_bit(WriteErrorSeen, &rdev->flags)) { + sector_t first_bad; + sector_t dev_sector = r10_bio->devs[i].addr; + int bad_sectors; + int is_bad; + + /* Discard request doesn't care the write result + * so it doesn't need to wait blocked disk here. + */ + if (!r10_bio->sectors) + continue; + + is_bad = is_badblock(rdev, dev_sector, r10_bio->sectors, + &first_bad, &bad_sectors); + if (is_bad < 0) { + /* Mustn't write here until the bad block + * is acknowledged + */ + atomic_inc(&rdev->nr_pending); + set_bit(BlockedBadBlocks, &rdev->flags); + blocked_rdev = rdev; + break; + } + } + } + rcu_read_unlock(); + + if (unlikely(blocked_rdev)) { + /* Have to wait for this device to get unblocked, then retry */ + allow_barrier(conf); + raid10_log(conf->mddev, "%s wait rdev %d blocked", + __func__, blocked_rdev->raid_disk); + md_wait_for_blocked_rdev(blocked_rdev, mddev); + wait_barrier(conf); + goto retry_wait; + } +} + static void raid10_write_request(struct mddev *mddev, struct bio *bio, struct r10bio *r10_bio) { struct r10conf *conf = mddev->private; int i; - struct md_rdev *blocked_rdev; sector_t sectors; int max_sectors; @@ -1338,8 +1401,9 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio, r10_bio->read_slot = -1; /* make sure repl_bio gets freed */ raid10_find_phys(conf, r10_bio); -retry_write: - blocked_rdev = NULL; + + wait_blocked_dev(mddev, r10_bio); + rcu_read_lock(); max_sectors = r10_bio->sectors; @@ -1350,16 +1414,6 @@ retry_write: conf->mirrors[d].replacement); if (rdev == rrdev) rrdev = NULL; - if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { - atomic_inc(&rdev->nr_pending); - blocked_rdev = rdev; - break; - } - if (rrdev && unlikely(test_bit(Blocked, &rrdev->flags))) { - atomic_inc(&rrdev->nr_pending); - blocked_rdev = rrdev; - break; - } if (rdev && (test_bit(Faulty, &rdev->flags))) rdev = NULL; if (rrdev && (test_bit(Faulty, &rrdev->flags))) @@ -1380,15 +1434,6 @@ retry_write: is_bad = is_badblock(rdev, dev_sector, max_sectors, &first_bad, &bad_sectors); - if (is_bad < 0) { - /* Mustn't write here until the bad block - * is acknowledged - */ - atomic_inc(&rdev->nr_pending); - set_bit(BlockedBadBlocks, &rdev->flags); - blocked_rdev = rdev; - break; - } if (is_bad && first_bad <= dev_sector) { /* Cannot write here at all */ bad_sectors -= (dev_sector - first_bad); @@ -1424,35 +1469,6 @@ retry_write: } rcu_read_unlock(); - if (unlikely(blocked_rdev)) { - /* Have to wait for this device to get unblocked, then retry */ - int j; - int d; - - for (j = 0; j < i; j++) { - if (r10_bio->devs[j].bio) { - d = r10_bio->devs[j].devnum; - rdev_dec_pending(conf->mirrors[d].rdev, mddev); - } - if (r10_bio->devs[j].repl_bio) { - struct md_rdev *rdev; - d = r10_bio->devs[j].devnum; - rdev = conf->mirrors[d].replacement; - if (!rdev) { - /* Race with remove_disk */ - smp_mb(); - rdev = conf->mirrors[d].rdev; - } - rdev_dec_pending(rdev, mddev); - } - } - allow_barrier(conf); - raid10_log(conf->mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); - md_wait_for_blocked_rdev(blocked_rdev, mddev); - wait_barrier(conf); - goto retry_write; - } - if (max_sectors < r10_bio->sectors) r10_bio->sectors = max_sectors; |