From bc2607f393bd4fb844c1886a02af929ca0372056 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 28 Jul 2011 11:39:22 +1000 Subject: md/raid5: write errors should be recorded as bad blocks if possible. When a write error is detected, don't mark the device as failed immediately but rather record the fact for handle_stripe to deal with. Handle_stripe then attempts to record a bad block. Only if that fails does the device get marked as faulty. Signed-off-by: NeilBrown --- drivers/md/raid5.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) (limited to 'drivers/md/raid5.c') diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 5fc621673e6c..9768a7d67148 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -1658,8 +1658,10 @@ static void raid5_end_write_request(struct bio *bi, int error) return; } - if (!uptodate) - md_error(conf->mddev, conf->disks[i].rdev); + if (!uptodate) { + set_bit(WriteErrorSeen, &conf->disks[i].rdev->flags); + set_bit(R5_WriteError, &sh->dev[i].flags); + } rdev_dec_pending(conf->disks[i].rdev, conf->mddev); @@ -3038,6 +3040,14 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) set_bit(R5_Insync, &dev->flags); } + if (test_bit(R5_WriteError, &dev->flags)) { + clear_bit(R5_Insync, &dev->flags); + if (!test_bit(Faulty, &rdev->flags)) { + s->handle_bad_blocks = 1; + atomic_inc(&rdev->nr_pending); + } else + clear_bit(R5_WriteError, &dev->flags); + } if (!test_bit(R5_Insync, &dev->flags)) { /* The ReadError flag will just be confusing now */ clear_bit(R5_ReadError, &dev->flags); @@ -3086,6 +3096,11 @@ static void handle_stripe(struct stripe_head *sh) analyse_stripe(sh, &s); + if (s.handle_bad_blocks) { + set_bit(STRIPE_HANDLE, &sh->state); + goto finish; + } + if (unlikely(s.blocked_rdev)) { if (s.syncing || s.expanding || s.expanded || s.to_write || s.written) { @@ -3283,6 +3298,20 @@ finish: if (unlikely(s.blocked_rdev)) md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev); + if (s.handle_bad_blocks) + for (i = disks; i--; ) { + mdk_rdev_t *rdev; + struct r5dev *dev = &sh->dev[i]; + if (test_and_clear_bit(R5_WriteError, &dev->flags)) { + /* We own a safe reference to the rdev */ + rdev = conf->disks[i].rdev; + if (!rdev_set_badblocks(rdev, sh->sector, + STRIPE_SECTORS, 0)) + md_error(conf->mddev, rdev); + rdev_dec_pending(rdev, conf->mddev); + } + } + if (s.ops_request) raid_run_ops(sh, s.ops_request); -- cgit v1.2.3