With commit 38f25255330 ("block: add __blkdev_issue_discard") DM thinp
no longer needs to carry its own async discard method.
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Acked-by: Joe Thornber <ejt@xxxxxxxxxx>
---
drivers/md/dm-thin.c | 70 ++++++++++++----------------------------------------
1 file changed, 16 insertions(+), 54 deletions(-)
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index da42c49..598a78b 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -322,56 +322,6 @@ struct thin_c {
/*----------------------------------------------------------------*/
-/**
- * __blkdev_issue_discard_async - queue a discard with async completion
- * @bdev: blockdev to issue discard for
- * @sector: start sector
- * @nr_sects: number of sectors to discard
- * @gfp_mask: memory allocation flags (for bio_alloc)
- * @flags: BLKDEV_IFL_* flags to control behaviour
- * @parent_bio: parent discard bio that all sub discards get chained to
- *
- * Description:
- * Asynchronously issue a discard request for the sectors in question.
- */
-static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sector,
- sector_t nr_sects, gfp_t gfp_mask, unsigned long flags,
- struct bio *parent_bio)
-{
- struct request_queue *q = bdev_get_queue(bdev);
- int type = REQ_WRITE | REQ_DISCARD;
- struct bio *bio;
-
- if (!q || !nr_sects)
- return -ENXIO;
-
- if (!blk_queue_discard(q))
- return -EOPNOTSUPP;
-
- if (flags & BLKDEV_DISCARD_SECURE) {
- if (!blk_queue_secdiscard(q))
- return -EOPNOTSUPP;
- type |= REQ_SECURE;
- }
-
- /*
- * Required bio_put occurs in bio_endio thanks to bio_chain below
- */
- bio = bio_alloc(gfp_mask, 1);
- if (!bio)
- return -ENOMEM;
-
- bio_chain(bio, parent_bio);
-
- bio->bi_iter.bi_sector = sector;
- bio->bi_bdev = bdev;
- bio->bi_iter.bi_size = nr_sects << 9;
-
- submit_bio(type, bio);
-
- return 0;
-}
-
static bool block_size_is_power_of_two(struct pool *pool)
{
return pool->sectors_per_block_shift >= 0;
@@ -387,11 +337,23 @@ static sector_t block_to_sectors(struct pool *pool, dm_block_t b)
static int issue_discard(struct thin_c *tc, dm_block_t data_b, dm_block_t data_e,
struct bio *parent_bio)
{
+ int type = REQ_WRITE | REQ_DISCARD;
sector_t s = block_to_sectors(tc->pool, data_b);
sector_t len = block_to_sectors(tc->pool, data_e - data_b);
+ struct bio *bio = NULL;
+ struct blk_plug plug;
+ int ret;
+
+ blk_start_plug(&plug);
+ ret = __blkdev_issue_discard(tc->pool_dev->bdev, s, len,
+ GFP_NOWAIT, type, &bio);
+ if (!ret && bio) {
+ bio_chain(bio, parent_bio);
+ submit_bio(type, bio);
+ }
+ blk_finish_plug(&plug);
- return __blkdev_issue_discard_async(tc->pool_dev->bdev, s, len,
- GFP_NOWAIT, 0, parent_bio);
+ return ret;
}
/*----------------------------------------------------------------*/
@@ -1543,11 +1505,11 @@ static void break_up_discard_bio(struct thin_c *tc, dm_block_t begin, dm_block_t
/*
* The parent bio must not complete before sub discard bios are
- * chained to it (see __blkdev_issue_discard_async's bio_chain)!
+ * chained to it (see issue_discard's bio_chain)!
*
* This per-mapping bi_remaining increment is paired with
* the implicit decrement that occurs via bio_endio() in
- * process_prepared_discard_{passdown,no_passdown}.
+ * process_prepared_discard_passdown().
*/
bio_inc_remaining(bio);
if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list))
--
2.6.4 (Apple Git-63)
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