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md/raid5: fix handling of degraded stripes in batches. 

There is no need for special handling of stripe-batches when the array
is degraded.

There may be if there is a failure in the batch, but STRIPE_DEGRADED
does not imply an error.

So don't set STRIPE_BATCH_ERR in ops_run_io just because the array is
degraded.
This actually causes a bug: the STRIPE_DEGRADED flag gets cleared in
check_break_stripe_batch_list() and so the bitmap bit gets cleared
when it shouldn't.

So in check_break_stripe_batch_list(), split the batch up completely -
again STRIPE_DEGRADED isn't meaningful.

Also don't set STRIPE_BATCH_ERR when there is a write error to a
replacement device.  This simply removes the replacement device and
requires no extra handling.

Signed-off-by: NeilBrown <neilb@suse.de>
hifive-unleashed-5.1
NeilBrown 2015-05-08 18:19:40 +10:00
parent 738a273806
commit bb27051f9f
1 changed files with 3 additions and 14 deletions
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17
drivers/md/raid5.c
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@ -1078,9 +1078,6 @@ again:
pr_debug("skip op %ld on disc %d for sector %llu\n",
bi->bi_rw, i, (unsigned long long)sh->sector);
clear_bit(R5_LOCKED, &sh->dev[i].flags);
if (sh->batch_head)
set_bit(STRIPE_BATCH_ERR,
&sh->batch_head->state);
set_bit(STRIPE_HANDLE, &sh->state);
}
@ -2448,7 +2445,7 @@ static void raid5_end_write_request(struct bio *bi, int error)
}
rdev_dec_pending(rdev, conf->mddev);
if (sh->batch_head && !uptodate)
if (sh->batch_head && !uptodate && !replacement)
set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state);
if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags))
@ -4214,15 +4211,9 @@ static void check_break_stripe_batch_list(struct stripe_head *sh)
return;
head_sh = sh;
do {
sh = list_first_entry(&sh->batch_list,
struct stripe_head, batch_list);
BUG_ON(sh == head_sh);
} while (!test_bit(STRIPE_DEGRADED, &sh->state));
while (sh != head_sh) {
next = list_first_entry(&sh->batch_list,
struct stripe_head, batch_list);
list_for_each_entry_safe(sh, next, &head_sh->batch_list, batch_list) {
list_del_init(&sh->batch_list);
set_mask_bits(&sh->state, ~STRIPE_EXPAND_SYNC_FLAG,
@ -4242,8 +4233,6 @@ static void check_break_stripe_batch_list(struct stripe_head *sh)
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
sh = next;
}
}