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md: revert io stats accounting

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The commit 41d2d848e5 ("md: improve io stats accounting") could cause
double fault problem per the report [1], and also it is not correct to
change ->bi_end_io if md don't own it, so let's revert it.

And io stats accounting will be replemented in later commits.

[1]. https://lore.kernel.org/linux-raid/3bf04253-3fad-434a-63a7-20214e38cf26@gmail.com/T/#t

Fixes: 41d2d848e5 ("md: improve io stats accounting")
Signed-off-by: Guoqing Jiang <jiangguoqing@kylinos.cn>
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Guoqing Jiang 2021-05-25 17:46:16 +08:00 committed by Song Liu
parent d07f3b081e
commit ad3fc79880
2 changed files with 0 additions and 46 deletions
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45
drivers/md/md.c
View file

@ -441,30 +441,6 @@ void md_handle_request(struct mddev *mddev, struct bio *bio)
}
EXPORT_SYMBOL(md_handle_request);
struct md_io {
struct mddev *mddev;
bio_end_io_t *orig_bi_end_io;
void *orig_bi_private;
struct block_device *orig_bi_bdev;
unsigned long start_time;
};
static void md_end_io(struct bio *bio)
{
struct md_io *md_io = bio->bi_private;
struct mddev *mddev = md_io->mddev;
bio_end_io_acct_remapped(bio, md_io->start_time, md_io->orig_bi_bdev);
bio->bi_end_io = md_io->orig_bi_end_io;
bio->bi_private = md_io->orig_bi_private;
mempool_free(md_io, &mddev->md_io_pool);
if (bio->bi_end_io)
bio->bi_end_io(bio);
}
static blk_qc_t md_submit_bio(struct bio *bio)
{
const int rw = bio_data_dir(bio);
@ -489,21 +465,6 @@ static blk_qc_t md_submit_bio(struct bio *bio)
return BLK_QC_T_NONE;
}
if (bio->bi_end_io != md_end_io) {
struct md_io *md_io;
md_io = mempool_alloc(&mddev->md_io_pool, GFP_NOIO);
md_io->mddev = mddev;
md_io->orig_bi_end_io = bio->bi_end_io;
md_io->orig_bi_private = bio->bi_private;
md_io->orig_bi_bdev = bio->bi_bdev;
bio->bi_end_io = md_end_io;
bio->bi_private = md_io;
md_io->start_time = bio_start_io_acct(bio);
}
/* bio could be mergeable after passing to underlayer */
bio->bi_opf &= ~REQ_NOMERGE;
@ -5608,7 +5569,6 @@ static void md_free(struct kobject *ko)
bioset_exit(&mddev->bio_set);
bioset_exit(&mddev->sync_set);
mempool_exit(&mddev->md_io_pool);
kfree(mddev);
}
@ -5705,11 +5665,6 @@ static int md_alloc(dev_t dev, char *name)
*/
mddev->hold_active = UNTIL_STOP;
error = mempool_init_kmalloc_pool(&mddev->md_io_pool, BIO_POOL_SIZE,
sizeof(struct md_io));
if (error)
goto abort;
error = -ENOMEM;
mddev->queue = blk_alloc_queue(NUMA_NO_NODE);
if (!mddev->queue)

1
drivers/md/md.h
View file

@ -487,7 +487,6 @@ struct mddev {
struct bio_set sync_set; /* for sync operations like
* metadata and bitmap writes
*/
mempool_t md_io_pool;
/* Generic flush handling.
* The last to finish preflush schedules a worker to submit