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md/raid1: fix write behind issues introduced by bio_clone_bioset_partial

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There are two issues, introduced by commit 8e58e32(md/raid1: use
bio_clone_bioset_partial() in case of write behind):
- bio_clone_bioset_partial() uses bytes instead of sectors as parameters
- in writebehind mode, we return bio if all !writemostly disk bios finish,
  which could happen before writemostly disk bios run. So all
  writemostly disk bios should have their bvec. Here we just make sure
  all bios are cloned instead of fast cloned.

Reviewed-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Shaohua Li 2017-02-21 14:27:57 -08:00
parent aff8da09f2
commit 1ec492232e
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/md/raid1.c
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@ -1472,8 +1472,8 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio)
!waitqueue_active(&bitmap->behind_wait)) {
mbio = bio_clone_bioset_partial(bio, GFP_NOIO,
mddev->bio_set,
offset,
max_sectors);
offset << 9,
max_sectors << 9);
alloc_behind_pages(mbio, r1_bio);
}
@ -1485,9 +1485,16 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio)
}
if (!mbio) {
if (r1_bio->behind_bvecs)
mbio = bio_clone_bioset_partial(bio, GFP_NOIO,
mddev->bio_set,
offset << 9,
max_sectors << 9);
else {
mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
bio_trim(mbio, offset, max_sectors);
}
}
if (r1_bio->behind_bvecs) {
struct bio_vec *bvec;