md: add md_submit_discard_bio() for submitting discard bio

Move these logic from raid0.c to md.c, so that we can also use it in
raid10.c.

Reviewed-by: Coly Li <colyli@suse.de>
Reviewed-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 64bc22d..dfff4bb 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8583,6 +8583,26 @@ 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 f9e2ccd..5433660 100644 (file)
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -713,6 +713,8 @@ 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 aa2d727..e2de0cc 100644 (file)
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -494,7 +494,6 @@ 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)
@@ -517,18 +516,9 @@ 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];
-               if (__blkdev_issue_discard(rdev->bdev,
+               md_submit_discard_bio(mddev, rdev, bio,
                        dev_start + zone->dev_start + rdev->data_offset,
-                       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);
+                       dev_end - dev_start);
        }
        bio_endio(bio);
 }