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md/raid1: use bio_clone_bioset_partial() in case of write behind
Write behind need to replace pages in bio's bvecs, and we have to clone a fresh bio with new bvec table, so use the introduced bio_clone_bioset_partial() for it. For other bio_clone_mddev() cases, we will use fast clone since they don't need to touch bvec table. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Shaohua Li <shli@fb.com>
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@ -1345,13 +1345,12 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
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first_clone = 1;
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for (i = 0; i < disks; i++) {
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struct bio *mbio;
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struct bio *mbio = NULL;
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sector_t offset;
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if (!r1_bio->bios[i])
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continue;
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mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
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bio_trim(mbio, r1_bio->sector - bio->bi_iter.bi_sector,
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max_sectors);
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offset = r1_bio->sector - bio->bi_iter.bi_sector;
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if (first_clone) {
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/* do behind I/O ?
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@ -1361,8 +1360,13 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
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if (bitmap &&
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(atomic_read(&bitmap->behind_writes)
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< mddev->bitmap_info.max_write_behind) &&
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!waitqueue_active(&bitmap->behind_wait))
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!waitqueue_active(&bitmap->behind_wait)) {
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mbio = bio_clone_bioset_partial(bio, GFP_NOIO,
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mddev->bio_set,
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offset,
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max_sectors);
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alloc_behind_pages(mbio, r1_bio);
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}
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bitmap_startwrite(bitmap, r1_bio->sector,
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r1_bio->sectors,
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@ -1370,6 +1374,12 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
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&r1_bio->state));
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first_clone = 0;
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}
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if (!mbio) {
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mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
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bio_trim(mbio, offset, max_sectors);
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}
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if (r1_bio->behind_bvecs) {
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struct bio_vec *bvec;
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int j;
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