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md/raid5. Don't write to known bad block on doubtful devices. 

If a device has seen write errors, don't write to any known
bad blocks on that device.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-07-28 11:39:22 +10:00
parent bc2607f393
commit 73e92e51b7
1 changed files with 30 additions and 1 deletions
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31
drivers/md/raid5.c
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@ -526,6 +526,36 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
atomic_inc(&rdev->nr_pending); atomic_inc(&rdev->nr_pending);
rcu_read_unlock(); rcu_read_unlock();
/* We have already checked bad blocks for reads. Now
* need to check for writes.
*/
while ((rw & WRITE) && rdev &&
test_bit(WriteErrorSeen, &rdev->flags)) {
sector_t first_bad;
int bad_sectors;
int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS,
&first_bad, &bad_sectors);
if (!bad)
break;
if (bad < 0) {
set_bit(BlockedBadBlocks, &rdev->flags);
if (!conf->mddev->external &&
conf->mddev->flags) {
/* It is very unlikely, but we might
* still need to write out the
* bad block log - better give it
* a chance*/
md_check_recovery(conf->mddev);
}
md_wait_for_blocked_rdev(rdev, conf->mddev);
} else {
/* Acknowledged bad block - skip the write */
rdev_dec_pending(rdev, conf->mddev);
rdev = NULL;
}
}
if (rdev) { if (rdev) {
if (s->syncing || s->expanding || s->expanded) if (s->syncing || s->expanding || s->expanded)
md_sync_acct(rdev->bdev, STRIPE_SECTORS); md_sync_acct(rdev->bdev, STRIPE_SECTORS);
@ -3317,7 +3347,6 @@ finish:
ops_run_io(sh, &s); ops_run_io(sh, &s);
if (s.dec_preread_active) { if (s.dec_preread_active) {
/* We delay this until after ops_run_io so that if make_request /* We delay this until after ops_run_io so that if make_request
* is waiting on a flush, it won't continue until the writes * is waiting on a flush, it won't continue until the writes