When raid1 or raid10 need find they will need to allocate
a new r1bio/r10bio, in order to work around a known bad block,
the 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: NeilBrown <neilb@xxxxxxxx>
---
drivers/md/raid1.c | 23 ++++++++++-------------
drivers/md/raid10.c | 22 +++++++++-------------
2 files changed, 19 insertions(+), 26 deletions(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 7b0f647bcccb..c1d0675880fb 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1326,18 +1326,9 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
goto retry_write;
}
- if (max_sectors < r1_bio->sectors) {
- /* We are splitting this write into multiple parts, so
- * we need to prepare for allocating another r1_bio.
- */
+ if (max_sectors < r1_bio->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;
atomic_set(&r1_bio->remaining, 1);
@@ -1426,10 +1417,16 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
* as it could result in the bio being freed.
*/
if (sectors_handled < bio_sectors(bio)) {
- r1_bio_write_done(r1_bio);
- /* We need another r1_bio. It has already been counted
+ /* We need another r1_bio, which must be accounted
* 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 = mempool_alloc(conf->r1bio_pool, GFP_NOIO);
r1_bio->master_bio = bio;
r1_bio->sectors = bio_sectors(bio) - sectors_handled;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 1920756828df..9258cbe233bb 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1383,18 +1383,8 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
goto retry_write;
}
- if (max_sectors < r10_bio->sectors) {
- /* We are splitting this into multiple parts, so
- * we need to prepare for allocating another r10_bio.
- */
+ if (max_sectors < r10_bio->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 -
bio->bi_iter.bi_sector;
@@ -1491,10 +1481,16 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
*/
if (sectors_handled < bio_sectors(bio)) {
- one_write_done(r10_bio);
- /* We need another r10_bio. It has already been counted
+ /* We need another r10_bio and it needs to be counted
* 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->master_bio = bio;
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
