diff options
| -rw-r--r-- | drivers/md/dm-io.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index 629083b..b8ed01b 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -299,11 +299,15 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where, sector_t remaining = where->count; struct request_queue *q = bdev_get_queue(where->bdev); sector_t discard_sectors; + unsigned int uninitialized_var(special_cmd_max_sectors); /* Reject unsupported discard requests */ - if ((rw & REQ_DISCARD) && !blk_queue_discard(q)) { - dec_count(io, region, -EOPNOTSUPP); - return; + if (rw & REQ_DISCARD) { + special_cmd_max_sectors = q->limits.max_discard_sectors; + if (special_cmd_max_sectors == 0) { + dec_count(io, region, -EOPNOTSUPP); + return; + } } /* @@ -328,7 +332,7 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where, store_io_and_region_in_bio(bio, io, region); if (rw & REQ_DISCARD) { - discard_sectors = min_t(sector_t, q->limits.max_discard_sectors, remaining); + discard_sectors = min_t(sector_t, special_cmd_max_sectors, remaining); bio->bi_size = discard_sectors << SECTOR_SHIFT; remaining -= discard_sectors; } else while (remaining) { |