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raid5: add a new flag to track if a stripe can be batched 

A freshly new stripe with write request can be batched. Any time the stripe is
handled or new read is queued, the flag will be cleared.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
shli@kernel.org 2014-12-15 12:57:03 +11:00 committed by NeilBrown
parent 46d5b78562
commit da41ba6597
2 changed files with 10 additions and 3 deletions
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12
drivers/md/raid5.c
View File

@ -555,6 +555,7 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
goto retry;
insert_hash(conf, sh);
sh->cpu = smp_processor_id();
set_bit(STRIPE_BATCH_READY, &sh->state);
}
static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector,
@ -2645,7 +2646,8 @@ schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s,
* toread/towrite point to the first in a chain.
* The bi_next chain must be in order.
*/
static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite)
static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx,
int forwrite, int previous)
{
struct bio **bip;
struct r5conf *conf = sh->raid_conf;
@ -2678,6 +2680,9 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi))
goto overlap;
if (!forwrite || previous)
clear_bit(STRIPE_BATCH_READY, &sh->state);
BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next);
if (*bip)
bi->bi_next = *bip;
@ -3824,6 +3829,7 @@ static void handle_stripe(struct stripe_head *sh)
return;
}
clear_bit(STRIPE_BATCH_READY, &sh->state);
if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) {
spin_lock(&sh->stripe_lock);
/* Cannot process 'sync' concurrently with 'discard' */
@ -4793,7 +4799,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
}
if (test_bit(STRIPE_EXPANDING, &sh->state) ||
!add_stripe_bio(sh, bi, dd_idx, rw)) {
!add_stripe_bio(sh, bi, dd_idx, rw, previous)) {
/* Stripe is busy expanding or
* add failed due to overlap. Flush everything
* and wait a while
@ -5206,7 +5212,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
return handled;
}
if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) {
if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) {
release_stripe(sh);
raid5_set_bi_processed_stripes(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;

1
drivers/md/raid5.h
View File

@ -327,6 +327,7 @@ enum {
STRIPE_ON_UNPLUG_LIST,
STRIPE_DISCARD,
STRIPE_ON_RELEASE_LIST,
STRIPE_BATCH_READY,
};
/*