Commit 6b6c8110 authored by NeilBrown's avatar NeilBrown Committed by Shaohua Li

md/raid1, raid10: move rXbio accounting closer to allocation.

When raid1 or raid10 find they will need to allocate a new
r1bio/r10bio, in order to work around a known bad block, they
account for the allocation well before the allocation is
made.  This separation makes the correctness less obvious
and requires comments.

The accounting needs to be a little before: before the first
rXbio is submitted, but that is all.

So move the accounting down to where it makes more sense.
Signed-off-by: default avatarNeilBrown <neilb@suse.com>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent 97d53438
...@@ -1436,18 +1436,9 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio) ...@@ -1436,18 +1436,9 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio)
goto retry_write; goto retry_write;
} }
if (max_sectors < r1_bio->sectors) { if (max_sectors < r1_bio->sectors)
/* We are splitting this write into multiple parts, so
* we need to prepare for allocating another r1_bio.
*/
r1_bio->sectors = max_sectors; r1_bio->sectors = max_sectors;
spin_lock_irq(&conf->device_lock);
if (bio->bi_phys_segments == 0)
bio->bi_phys_segments = 2;
else
bio->bi_phys_segments++;
spin_unlock_irq(&conf->device_lock);
}
sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector; sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector;
atomic_set(&r1_bio->remaining, 1); atomic_set(&r1_bio->remaining, 1);
...@@ -1553,10 +1544,17 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio) ...@@ -1553,10 +1544,17 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio)
* as it could result in the bio being freed. * as it could result in the bio being freed.
*/ */
if (sectors_handled < bio_sectors(bio)) { if (sectors_handled < bio_sectors(bio)) {
r1_bio_write_done(r1_bio); /* We need another r1_bio, which must be accounted
/* We need another r1_bio. It has already been counted
* in bio->bi_phys_segments * in bio->bi_phys_segments
*/ */
spin_lock_irq(&conf->device_lock);
if (bio->bi_phys_segments == 0)
bio->bi_phys_segments = 2;
else
bio->bi_phys_segments++;
spin_unlock_irq(&conf->device_lock);
r1_bio_write_done(r1_bio);
r1_bio = alloc_r1bio(mddev, bio, sectors_handled); r1_bio = alloc_r1bio(mddev, bio, sectors_handled);
goto retry_write; goto retry_write;
} }
......
...@@ -1384,18 +1384,8 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio, ...@@ -1384,18 +1384,8 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
goto retry_write; goto retry_write;
} }
if (max_sectors < r10_bio->sectors) { if (max_sectors < r10_bio->sectors)
/* We are splitting this into multiple parts, so
* we need to prepare for allocating another r10_bio.
*/
r10_bio->sectors = max_sectors; r10_bio->sectors = max_sectors;
spin_lock_irq(&conf->device_lock);
if (bio->bi_phys_segments == 0)
bio->bi_phys_segments = 2;
else
bio->bi_phys_segments++;
spin_unlock_irq(&conf->device_lock);
}
sectors_handled = r10_bio->sector + max_sectors - sectors_handled = r10_bio->sector + max_sectors -
bio->bi_iter.bi_sector; bio->bi_iter.bi_sector;
...@@ -1505,10 +1495,16 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio, ...@@ -1505,10 +1495,16 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
*/ */
if (sectors_handled < bio_sectors(bio)) { if (sectors_handled < bio_sectors(bio)) {
one_write_done(r10_bio); /* We need another r10_bio and it needs to be counted
/* We need another r10_bio. It has already been counted
* in bio->bi_phys_segments. * in bio->bi_phys_segments.
*/ */
spin_lock_irq(&conf->device_lock);
if (bio->bi_phys_segments == 0)
bio->bi_phys_segments = 2;
else
bio->bi_phys_segments++;
spin_unlock_irq(&conf->device_lock);
one_write_done(r10_bio);
r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
r10_bio->master_bio = bio; r10_bio->master_bio = bio;
......
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