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md/raid5: always convert llbitmap bits for discard

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llbitmap discard is useful even when no underlying member device supports
it. The discard still converts the llbitmap range to unwritten, so later
reads and recovery do not rely on stale parity for that range.

Let llbitmap discard bypass the raid5 lower discard support check. If lower
discard is not safe or not supported, complete the accounted clone after
md_account_bio() so the llbitmap conversion callbacks run without member
discard bios.

Link: https://patch.msgid.link/20260605072639.2434847-4-yukuai@kernel.org
Signed-off-by: Yu Kuai <yukuai@fygo.io>
This commit is contained in:
Yu Kuai
2026-06-05 15:26:39 +08:00
parent 9057309267
commit 53528031e7
1 changed files with 9 additions and 0 deletions
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9
drivers/md/raid5.c
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@@ -1138,6 +1138,9 @@ static bool raid5_discard_limits(struct mddev *mddev, struct bio *bi)
{
struct r5conf *conf = mddev->private;
if (mddev->bitmap_id == ID_LLBITMAP)
return true;
if (!conf->raid5_discard_unsupported)
return true;
@@ -5740,6 +5743,12 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
bi->bi_iter = bi_iter;
bi->bi_next = NULL;
if (mddev->bitmap_id == ID_LLBITMAP &&
conf->raid5_discard_unsupported) {
bio_endio(bi);
return;
}
logical_sector = first_stripe * conf->chunk_sectors;
last_sector = last_stripe * conf->chunk_sectors;