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md/raid5: call bio_endio() directly rather than queueing for later.

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We currently gather bios that need to be returned into a bio_list
and call bio_endio() on them all together.
The original reason for this was to avoid making the calls while
holding a spinlock.
Locking has changed a lot since then, and that reason is no longer
valid.

So discard return_io() and various return_bi lists, and just call
bio_endio() directly as needed.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown 2017-03-15 14:05:12 +11:00 committed by Shaohua Li
parent 16d997b78b
commit bd83d0a28c
4 changed files with 16 additions and 38 deletions
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13
drivers/md/raid5-cache.c
View File

@ -308,8 +308,7 @@ static void __r5l_set_io_unit_state(struct r5l_io_unit *io,
}
static void
r5c_return_dev_pending_writes(struct r5conf *conf, struct r5dev *dev,
struct bio_list *return_bi)
r5c_return_dev_pending_writes(struct r5conf *conf, struct r5dev *dev)
{
struct bio *wbi, *wbi2;
@ -319,23 +318,21 @@ r5c_return_dev_pending_writes(struct r5conf *conf, struct r5dev *dev,
dev->sector + STRIPE_SECTORS) {
wbi2 = r5_next_bio(wbi, dev->sector);
md_write_end(conf->mddev);
if (!raid5_dec_bi_active_stripes(wbi)) {
bio_list_add(return_bi, wbi);
}
if (!raid5_dec_bi_active_stripes(wbi))
bio_endio(wbi);
wbi = wbi2;
}
}
void r5c_handle_cached_data_endio(struct r5conf *conf,
struct stripe_head *sh, int disks, struct bio_list *return_bi)
struct stripe_head *sh, int disks)
{
int i;
for (i = sh->disks; i--; ) {
if (sh->dev[i].written) {
set_bit(R5_UPTODATE, &sh->dev[i].flags);
r5c_return_dev_pending_writes(conf, &sh->dev[i],
return_bi);
r5c_return_dev_pending_writes(conf, &sh->dev[i]);
bitmap_endwrite(conf->mddev->bitmap, sh->sector,
STRIPE_SECTORS,
!test_bit(STRIPE_DEGRADED, &sh->state),

2
drivers/md/raid5-log.h
View File

@ -21,7 +21,7 @@ extern void r5c_release_extra_page(struct stripe_head *sh);
extern void r5c_use_extra_page(struct stripe_head *sh);
extern void r5l_wake_reclaim(struct r5l_log *log, sector_t space);
extern void r5c_handle_cached_data_endio(struct r5conf *conf,
struct stripe_head *sh, int disks, struct bio_list *return_bi);
struct stripe_head *sh, int disks);
extern int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh);
extern void r5c_make_stripe_write_out(struct stripe_head *sh);
extern void r5c_flush_cache(struct r5conf *conf, int num);

38
drivers/md/raid5.c
View File

@ -158,17 +158,6 @@ static int raid6_idx_to_slot(int idx, struct stripe_head *sh,
return slot;
}
static void return_io(struct bio_list *return_bi)
{
struct bio *bi;
while ((bi = bio_list_pop(return_bi)) != NULL) {
bi->bi_iter.bi_size = 0;
trace_block_bio_complete(bdev_get_queue(bi->bi_bdev),
bi, 0);
bio_endio(bi);
}
}
static void print_raid5_conf (struct r5conf *conf);
static int stripe_operations_active(struct stripe_head *sh)
@ -1310,7 +1299,6 @@ async_copy_data(int frombio, struct bio *bio, struct page **page,
static void ops_complete_biofill(void *stripe_head_ref)
{
struct stripe_head *sh = stripe_head_ref;
struct bio_list return_bi = BIO_EMPTY_LIST;
int i;
pr_debug("%s: stripe %llu\n", __func__,
@ -1335,15 +1323,13 @@ static void ops_complete_biofill(void *stripe_head_ref)
dev->sector + STRIPE_SECTORS) {
rbi2 = r5_next_bio(rbi, dev->sector);
if (!raid5_dec_bi_active_stripes(rbi))
bio_list_add(&return_bi, rbi);
bio_endio(rbi);
rbi = rbi2;
}
}
}
clear_bit(STRIPE_BIOFILL_RUN, &sh->state);
return_io(&return_bi);
set_bit(STRIPE_HANDLE, &sh->state);
raid5_release_stripe(sh);
}
@ -3351,8 +3337,7 @@ static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous,
static void
handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
struct stripe_head_state *s, int disks,
struct bio_list *return_bi)
struct stripe_head_state *s, int disks)
{
int i;
BUG_ON(sh->batch_head);
@ -3400,7 +3385,7 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
bi->bi_error = -EIO;
md_write_end(conf->mddev);
if (!raid5_dec_bi_active_stripes(bi))
bio_list_add(return_bi, bi);
bio_endio(bi);
bi = nextbi;
}
if (bitmap_end)
@ -3423,7 +3408,7 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
bi->bi_error = -EIO;
md_write_end(conf->mddev);
if (!raid5_dec_bi_active_stripes(bi))
bio_list_add(return_bi, bi);
bio_endio(bi);
bi = bi2;
}
@ -3449,7 +3434,7 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
bi->bi_error = -EIO;
if (!raid5_dec_bi_active_stripes(bi))
bio_list_add(return_bi, bi);
bio_endio(bi);
bi = nextbi;
}
}
@ -3748,7 +3733,7 @@ static void break_stripe_batch_list(struct stripe_head *head_sh,
* never LOCKED, so we don't need to test 'failed' directly.
*/
static void handle_stripe_clean_event(struct r5conf *conf,
struct stripe_head *sh, int disks, struct bio_list *return_bi)
struct stripe_head *sh, int disks)
{
int i;
struct r5dev *dev;
@ -3782,7 +3767,7 @@ returnbi:
wbi2 = r5_next_bio(wbi, dev->sector);
md_write_end(conf->mddev);
if (!raid5_dec_bi_active_stripes(wbi))
bio_list_add(return_bi, wbi);
bio_endio(wbi);
wbi = wbi2;
}
bitmap_endwrite(conf->mddev->bitmap, sh->sector,
@ -4725,7 +4710,7 @@ static void handle_stripe(struct stripe_head *sh)
sh->reconstruct_state = 0;
break_stripe_batch_list(sh, 0);
if (s.to_read+s.to_write+s.written)
handle_failed_stripe(conf, sh, &s, disks, &s.return_bi);
handle_failed_stripe(conf, sh, &s, disks);
if (s.syncing + s.replacing)
handle_failed_sync(conf, sh, &s);
}
@ -4791,10 +4776,10 @@ static void handle_stripe(struct stripe_head *sh)
&& !test_bit(R5_LOCKED, &qdev->flags)
&& (test_bit(R5_UPTODATE, &qdev->flags) ||
test_bit(R5_Discard, &qdev->flags))))))
handle_stripe_clean_event(conf, sh, disks, &s.return_bi);
handle_stripe_clean_event(conf, sh, disks);
if (s.just_cached)
r5c_handle_cached_data_endio(conf, sh, disks, &s.return_bi);
r5c_handle_cached_data_endio(conf, sh, disks);
log_stripe_write_finished(sh);
/* Now we might consider reading some blocks, either to check/generate
@ -5022,9 +5007,6 @@ finish:
md_wakeup_thread(conf->mddev->thread);
}
if (!bio_list_empty(&s.return_bi))
return_io(&s.return_bi);
clear_bit_unlock(STRIPE_ACTIVE, &sh->state);
}

1
drivers/md/raid5.h
View File

@ -278,7 +278,6 @@ struct stripe_head_state {
int dec_preread_active;
unsigned long ops_request;
struct bio_list return_bi;
struct md_rdev *blocked_rdev;
int handle_bad_blocks;
int log_failed;