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-rw-r--r--drivers/md/raid0.c116
1 files changed, 102 insertions, 14 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 84e58596594d..d6c0bc76e837 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -385,7 +385,7 @@ static int raid0_run(struct mddev *mddev)
blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors);
- blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
+ blk_queue_max_discard_sectors(mddev->queue, UINT_MAX);
blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
blk_queue_io_opt(mddev->queue,
@@ -459,6 +459,95 @@ static inline int is_io_in_chunk_boundary(struct mddev *mddev,
}
}
+static void raid0_handle_discard(struct mddev *mddev, struct bio *bio)
+{
+ struct r0conf *conf = mddev->private;
+ struct strip_zone *zone;
+ sector_t start = bio->bi_iter.bi_sector;
+ sector_t end;
+ unsigned int stripe_size;
+ sector_t first_stripe_index, last_stripe_index;
+ sector_t start_disk_offset;
+ unsigned int start_disk_index;
+ sector_t end_disk_offset;
+ unsigned int end_disk_index;
+ unsigned int disk;
+
+ zone = find_zone(conf, &start);
+
+ if (bio_end_sector(bio) > zone->zone_end) {
+ struct bio *split = bio_split(bio,
+ zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO,
+ mddev->bio_set);
+ bio_chain(split, bio);
+ generic_make_request(bio);
+ bio = split;
+ end = zone->zone_end;
+ } else
+ end = bio_end_sector(bio);
+
+ if (zone != conf->strip_zone)
+ end = end - zone[-1].zone_end;
+
+ /* Now start and end is the offset in zone */
+ stripe_size = zone->nb_dev * mddev->chunk_sectors;
+
+ first_stripe_index = start;
+ sector_div(first_stripe_index, stripe_size);
+ last_stripe_index = end;
+ sector_div(last_stripe_index, stripe_size);
+
+ start_disk_index = (int)(start - first_stripe_index * stripe_size) /
+ mddev->chunk_sectors;
+ start_disk_offset = ((int)(start - first_stripe_index * stripe_size) %
+ mddev->chunk_sectors) +
+ first_stripe_index * mddev->chunk_sectors;
+ end_disk_index = (int)(end - last_stripe_index * stripe_size) /
+ mddev->chunk_sectors;
+ end_disk_offset = ((int)(end - last_stripe_index * stripe_size) %
+ mddev->chunk_sectors) +
+ last_stripe_index * mddev->chunk_sectors;
+
+ 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)
+ dev_start = (first_stripe_index + 1) *
+ mddev->chunk_sectors;
+ else if (disk > start_disk_index)
+ dev_start = first_stripe_index * mddev->chunk_sectors;
+ else
+ dev_start = start_disk_offset;
+
+ if (disk < end_disk_index)
+ dev_end = (last_stripe_index + 1) * mddev->chunk_sectors;
+ else if (disk > end_disk_index)
+ dev_end = last_stripe_index * mddev->chunk_sectors;
+ else
+ dev_end = end_disk_offset;
+
+ if (dev_end <= dev_start)
+ continue;
+
+ rdev = conf->devlist[(zone - conf->strip_zone) *
+ conf->strip_zone[0].nb_dev + disk];
+ if (__blkdev_issue_discard(rdev->bdev,
+ 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);
+ if (mddev->gendisk)
+ trace_block_bio_remap(bdev_get_queue(rdev->bdev),
+ discard_bio, disk_devt(mddev->gendisk),
+ bio->bi_iter.bi_sector);
+ generic_make_request(discard_bio);
+ }
+ bio_endio(bio);
+}
+
static void raid0_make_request(struct mddev *mddev, struct bio *bio)
{
struct strip_zone *zone;
@@ -473,6 +562,11 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio)
return;
}
+ if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) {
+ raid0_handle_discard(mddev, bio);
+ return;
+ }
+
bio_sector = bio->bi_iter.bi_sector;
sector = bio_sector;
chunk_sects = mddev->chunk_sectors;
@@ -498,19 +592,13 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio)
bio->bi_iter.bi_sector = sector + zone->dev_start +
tmp_dev->data_offset;
- if (unlikely((bio_op(bio) == REQ_OP_DISCARD) &&
- !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) {
- /* Just ignore it */
- bio_endio(bio);
- } else {
- if (mddev->gendisk)
- trace_block_bio_remap(bdev_get_queue(bio->bi_bdev),
- bio, disk_devt(mddev->gendisk),
- bio_sector);
- mddev_check_writesame(mddev, bio);
- mddev_check_write_zeroes(mddev, bio);
- generic_make_request(bio);
- }
+ if (mddev->gendisk)
+ trace_block_bio_remap(bdev_get_queue(bio->bi_bdev),
+ bio, disk_devt(mddev->gendisk),
+ bio_sector);
+ mddev_check_writesame(mddev, bio);
+ mddev_check_write_zeroes(mddev, bio);
+ generic_make_request(bio);
}
static void raid0_status(struct seq_file *seq, struct mddev *mddev)