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| author | Christoph Hellwig | 2017-04-05 19:21:15 +0200 |
|---|---|---|
| committer | Jens Axboe | 2017-04-08 19:25:38 +0200 |
| commit | 19372e2769179ddd154a0d6fbbdb719eb5d0af12 (patch) | |
| tree | 024ee1cc37ae90328dac4627daa160972691543b /drivers/block/loop.c | |
| parent | zram: implement REQ_OP_WRITE_ZEROES (diff) | |
| download | kernel-qcow2-linux-19372e2769179ddd154a0d6fbbdb719eb5d0af12.tar.gz kernel-qcow2-linux-19372e2769179ddd154a0d6fbbdb719eb5d0af12.tar.xz kernel-qcow2-linux-19372e2769179ddd154a0d6fbbdb719eb5d0af12.zip | |
loop: implement REQ_OP_WRITE_ZEROES
It's identical to discard as hole punches will always leave us with
zeroes on reads.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index cc981f34e017..3bb04c1a4ba1 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -528,6 +528,7 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq) case REQ_OP_FLUSH: return lo_req_flush(lo, rq); case REQ_OP_DISCARD: + case REQ_OP_WRITE_ZEROES: return lo_discard(lo, rq, pos); case REQ_OP_WRITE: if (lo->transfer) @@ -826,6 +827,7 @@ static void loop_config_discard(struct loop_device *lo) q->limits.discard_granularity = 0; q->limits.discard_alignment = 0; blk_queue_max_discard_sectors(q, 0); + blk_queue_max_write_zeroes_sectors(q, 0); q->limits.discard_zeroes_data = 0; queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); return; @@ -834,6 +836,7 @@ static void loop_config_discard(struct loop_device *lo) q->limits.discard_granularity = inode->i_sb->s_blocksize; q->limits.discard_alignment = 0; blk_queue_max_discard_sectors(q, UINT_MAX >> 9); + blk_queue_max_write_zeroes_sectors(q, UINT_MAX >> 9); q->limits.discard_zeroes_data = 1; queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); } @@ -1660,6 +1663,7 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx, switch (req_op(cmd->rq)) { case REQ_OP_FLUSH: case REQ_OP_DISCARD: + case REQ_OP_WRITE_ZEROES: cmd->use_aio = false; break; default: |