diff options
| -rw-r--r-- | drivers/block/brd.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/block/brd.c b/drivers/block/brd.c index b900fe9e0030..558d8e670566 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -222,6 +222,23 @@ out: return err; } +static void brd_do_discard(struct brd_device *brd, sector_t sector, u32 size) +{ + sector_t aligned_sector = (sector + PAGE_SECTORS) & ~PAGE_SECTORS; + struct page *page; + + size -= (aligned_sector - sector) * SECTOR_SIZE; + xa_lock(&brd->brd_pages); + while (size >= PAGE_SIZE && aligned_sector < rd_size * 2) { + page = __xa_erase(&brd->brd_pages, aligned_sector >> PAGE_SECTORS_SHIFT); + if (page) + __free_page(page); + aligned_sector += PAGE_SECTORS; + size -= PAGE_SIZE; + } + xa_unlock(&brd->brd_pages); +} + static void brd_submit_bio(struct bio *bio) { struct brd_device *brd = bio->bi_bdev->bd_disk->private_data; @@ -229,6 +246,12 @@ static void brd_submit_bio(struct bio *bio) struct bio_vec bvec; struct bvec_iter iter; + if (unlikely(op_is_discard(bio->bi_opf))) { + brd_do_discard(brd, sector, bio->bi_iter.bi_size); + bio_endio(bio); + return; + } + bio_for_each_segment(bvec, bio, iter) { unsigned int len = bvec.bv_len; int err; @@ -309,6 +332,9 @@ static int brd_alloc(int i) * is harmless) */ .physical_block_size = PAGE_SIZE, + .max_hw_discard_sectors = UINT_MAX, + .max_discard_segments = 1, + .discard_granularity = PAGE_SIZE, }; list_for_each_entry(brd, &brd_devices, brd_list) |