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raid5-cache: optimize FLUSH IO with log enabled 

With log enabled, bio is written to raid disks after the bio is settled
down in log disk. The recovery guarantees we can recovery the bio data
from log disk, so we we skip FLUSH IO.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Shaohua Li 2015-09-02 13:49:49 -07:00 committed by NeilBrown
parent 509ffec708
commit 828cbe989e
3 changed files with 28 additions and 2 deletions
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18
drivers/md/raid5-cache.c
View File

@ -507,6 +507,24 @@ void r5l_write_stripe_run(struct r5l_log *log)
mutex_unlock(&log->io_mutex);
}
int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio)
{
if (!log)
return -ENODEV;
/*
* we flush log disk cache first, then write stripe data to raid disks.
* So if bio is finished, the log disk cache is flushed already. The
* recovery guarantees we can recovery the bio from log disk, so we
* don't need to flush again
*/
if (bio->bi_iter.bi_size == 0) {
bio_endio(bio);
return 0;
}
bio->bi_rw &= ~REQ_FLUSH;
return -EAGAIN;
}
/* This will run after log space is reclaimed */
static void r5l_run_no_space_stripes(struct r5l_log *log)
{

11
drivers/md/raid5.c
View File

@ -5146,8 +5146,15 @@ static void make_request(struct mddev *mddev, struct bio * bi)
bool do_prepare;
if (unlikely(bi->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bi);
return;
int ret = r5l_handle_flush_request(conf->log, bi);
if (ret == 0)
return;
if (ret == -ENODEV) {
md_flush_request(mddev, bi);
return;
}
/* ret == -EAGAIN, fallback */
}
md_write_start(mddev, bi);

1
drivers/md/raid5.h
View File

@ -629,4 +629,5 @@ extern int r5l_write_stripe(struct r5l_log *log, struct stripe_head *head_sh);
extern void r5l_write_stripe_run(struct r5l_log *log);
extern void r5l_flush_stripe_to_raid(struct r5l_log *log);
extern void r5l_stripe_write_finished(struct stripe_head *sh);
extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio);
#endif