From 57a0f3a81ef21fe51d6223aa78a1a890098d4ada Mon Sep 17 00:00:00 2001
From: Song Liu <songliubraving@fb.com>
Date: Wed, 9 Dec 2020 11:44:42 -0800
Subject: [PATCH] Revert "md: add md_submit_discard_bio() for submitting
discard bio"
This reverts commit 2628089b74d5a64bd0bcb5d247a18f78d7b6f4d0.
Matthew Ruffell reported data corruption in raid10 due to the changes
in discard handling [1]. Revert these changes before we find a proper fix.
[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1907262/
Cc: Matthew Ruffell <matthew.ruffell@canonical.com>
Cc: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
drivers/md/md.c | 20 --------------------
drivers/md/md.h | 2 --
drivers/md/raid0.c | 14 ++++++++++++--
3 files changed, 12 insertions(+), 24 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 98bac4f304ae26..0037c6ecab6501 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8582,26 +8582,6 @@ void md_write_end(struct mddev *mddev)
EXPORT_SYMBOL(md_write_end);
-/* This is used by raid0 and raid10 */
-void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
- struct bio *bio, sector_t start, sector_t size)
-{
- struct bio *discard_bio = NULL;
-
- if (__blkdev_issue_discard(rdev->bdev, start, size,
- GFP_NOIO, 0, &discard_bio) || !discard_bio)
- return;
-
- bio_chain(discard_bio, bio);
- bio_clone_blkg_association(discard_bio, bio);
- if (mddev->gendisk)
- trace_block_bio_remap(bdev_get_queue(rdev->bdev),
- discard_bio, disk_devt(mddev->gendisk),
- bio->bi_iter.bi_sector);
- submit_bio_noacct(discard_bio);
-}
-EXPORT_SYMBOL(md_submit_discard_bio);
-
/* md_allow_write(mddev)
* Calling this ensures that the array is marked 'active' so that writes
* may proceed without blocking. It is important to call this before
diff --git a/drivers/md/md.h b/drivers/md/md.h
index ccfb69868c2ec9..2175a5ac4f7c68 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -713,8 +713,6 @@ extern void md_write_end(struct mddev *mddev);
extern void md_done_sync(struct mddev *mddev, int blocks, int ok);
extern void md_error(struct mddev *mddev, struct md_rdev *rdev);
extern void md_finish_reshape(struct mddev *mddev);
-extern void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
- struct bio *bio, sector_t start, sector_t size);
extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio);
extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 6f44177593a552..35843df15b5e68 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -477,6 +477,7 @@ static void raid0_handle_discard(struct mddev *mddev, struct bio *bio)
for (disk = 0; disk < zone->nb_dev; disk++) {
sector_t dev_start, dev_end;
+ struct bio *discard_bio = NULL;
struct md_rdev *rdev;
if (disk < start_disk_index)
@@ -499,9 +500,18 @@ static void raid0_handle_discard(struct mddev *mddev, struct bio *bio)
rdev = conf->devlist[(zone - conf->strip_zone) *
conf->strip_zone[0].nb_dev + disk];
- md_submit_discard_bio(mddev, rdev, bio,
+ if (__blkdev_issue_discard(rdev->bdev,
dev_start + zone->dev_start + rdev->data_offset,
- dev_end - dev_start);
+ dev_end - dev_start, GFP_NOIO, 0, &discard_bio) ||
+ !discard_bio)
+ continue;
+ bio_chain(discard_bio, bio);
+ bio_clone_blkg_association(discard_bio, bio);
+ if (mddev->gendisk)
+ trace_block_bio_remap(bdev_get_queue(rdev->bdev),
+ discard_bio, disk_devt(mddev->gendisk),
+ bio->bi_iter.bi_sector);
+ submit_bio_noacct(discard_bio);
}
bio_endio(bio);
}
--
GitLab