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md/raid10: fix FailFast test for wrong device

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We need to test FailFast flag for replacement device here
since the set up for writing is for the replacement, so we
need fix it like:

- if (test_bit(FailFast, &conf->mirrors[d].rdev->flags))
+ if (test_bit(FailFast, &conf->mirrors[d].replacement->flags))

Since commit f90145f317 ("md/raid10: add rcu protection
to rdev access in raid10_sync_request.") had added the rcu
protection for the part, so let's extend the range protected
by rcu and use rdev directly.

Fixes: 1919cbb ("md/raid10: add failfast handling for writes.")
Reviewed-by: NeilBrown <[email protected]>
Signed-off-by: Guoqing Jiang <[email protected]>
Signed-off-by: Shaohua Li <[email protected]>
This commit is contained in:
Guoqing Jiang 2017-06-13 11:16:08 +08:00 • committed by Shaohua Li
commit 1cdd125794
1 changed files with 3 additions and 3 deletions
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6
drivers/md/raid10.c
View file

@ -3295,7 +3295,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
biolist = bio;
bio->bi_end_io = end_sync_read;
bio_set_op_attrs(bio, REQ_OP_READ, 0);
if (test_bit(FailFast, &conf->mirrors[d].rdev->flags))
if (test_bit(FailFast, &rdev->flags))
bio->bi_opf |= MD_FAILFAST;
bio->bi_iter.bi_sector = sector + rdev->data_offset;
bio->bi_bdev = rdev->bdev;
@ -3307,7 +3307,6 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
continue;
}
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
/* Need to set up for writing to the replacement */
bio = r10_bio->devs[i].repl_bio;
@ -3318,11 +3317,12 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
biolist = bio;
bio->bi_end_io = end_sync_write;
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
if (test_bit(FailFast, &conf->mirrors[d].rdev->flags))
if (test_bit(FailFast, &rdev->flags))
bio->bi_opf |= MD_FAILFAST;
bio->bi_iter.bi_sector = sector + rdev->data_offset;
bio->bi_bdev = rdev->bdev;
count++;
rcu_read_unlock();
}
if (count < 2) {