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raid5-ppl: fix handling flush requests 

Add missing bio completion. Without this any flush request would hang.

Fixes: 1532d9e87e ("raid5-ppl: PPL support for disks with write-back cache enabled")
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <sh.li@alibaba-inc.com>
This commit is contained in:
Artur Paszkiewicz 2018-02-20 10:10:36 +01:00 committed by Shaohua Li
parent 01a69cab01
commit f4bc0c813e
2 changed files with 12 additions and 1 deletions
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3
drivers/md/raid5-log.h
View File

@ -44,6 +44,7 @@ extern void ppl_write_stripe_run(struct r5conf *conf);
extern void ppl_stripe_write_finished(struct stripe_head *sh);
extern int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add);
extern void ppl_quiesce(struct r5conf *conf, int quiesce);
extern int ppl_handle_flush_request(struct r5l_log *log, struct bio *bio);
static inline bool raid5_has_ppl(struct r5conf *conf)
{
@ -104,7 +105,7 @@ static inline int log_handle_flush_request(struct r5conf *conf, struct bio *bio)
if (conf->log)
ret = r5l_handle_flush_request(conf->log, bio);
else if (raid5_has_ppl(conf))
ret = 0;
ret = ppl_handle_flush_request(conf->log, bio);
return ret;
}

10
drivers/md/raid5-ppl.c
View File

@ -693,6 +693,16 @@ void ppl_quiesce(struct r5conf *conf, int quiesce)
}
}
int ppl_handle_flush_request(struct r5l_log *log, struct bio *bio)
{
if (bio->bi_iter.bi_size == 0) {
bio_endio(bio);
return 0;
}
bio->bi_opf &= ~REQ_PREFLUSH;
return -EAGAIN;
}
void ppl_stripe_write_finished(struct stripe_head *sh)
{
struct ppl_io_unit *io;