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md/raid10: unify handling of write completion. 

A write can complete at two different places:
1/ when the last member-device write completes, through
   raid10_end_write_request
2/ in make_request() when we remove the initial bias from ->remaining.

These two should do exactly the same thing and the comment says they
do, but they don't.

So factor the correct code out into a function and call it in both
places.  This makes the code much more similar to RAID1.

The difference is only significant if there is an error, and they
usually take a while, so it is unlikely that there will be an error
already when make_request is completing, so this is unlikely to cause
real problems.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-09-10 17:21:17 +10:00
parent 94007751bb
commit 19d5f834d6
1 changed files with 18 additions and 20 deletions
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38
drivers/md/raid10.c
View File

@ -337,6 +337,21 @@ static void close_write(r10bio_t *r10_bio)
md_write_end(r10_bio->mddev);
}
static void one_write_done(r10bio_t *r10_bio)
{
if (atomic_dec_and_test(&r10_bio->remaining)) {
if (test_bit(R10BIO_WriteError, &r10_bio->state))
reschedule_retry(r10_bio);
else {
close_write(r10_bio);
if (test_bit(R10BIO_MadeGood, &r10_bio->state))
reschedule_retry(r10_bio);
else
raid_end_bio_io(r10_bio);
}
}
}
static void raid10_end_write_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
@ -387,17 +402,7 @@ static void raid10_end_write_request(struct bio *bio, int error)
* Let's see if all mirrored write operations have finished
* already.
*/
if (atomic_dec_and_test(&r10_bio->remaining)) {
if (test_bit(R10BIO_WriteError, &r10_bio->state))
reschedule_retry(r10_bio);
else {
close_write(r10_bio);
if (test_bit(R10BIO_MadeGood, &r10_bio->state))
reschedule_retry(r10_bio);
else
raid_end_bio_io(r10_bio);
}
}
one_write_done(r10_bio);
if (dec_rdev)
rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev);
}
@ -1127,15 +1132,8 @@ retry_write:
spin_unlock_irqrestore(&conf->device_lock, flags);
}
if (atomic_dec_and_test(&r10_bio->remaining)) {
/* This matches the end of raid10_end_write_request() */
bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector,
r10_bio->sectors,
!test_bit(R10BIO_Degraded, &r10_bio->state),
0);
md_write_end(mddev);
raid_end_bio_io(r10_bio);
}
/* Remove the bias on 'remaining' */
one_write_done(r10_bio);
/* In case raid10d snuck in to freeze_array */
wake_up(&conf->wait_barrier);