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authorChristoph Hellwig <hch@lst.de>2017-04-05 19:21:15 +0200
committerJens Axboe <axboe@fb.com>2017-04-08 11:25:38 -0600
commit19372e2769179ddd154a0d6fbbdb719eb5d0af12 (patch)
tree024ee1cc37ae90328dac4627daa160972691543b /drivers/block/loop.c
parent31edeacd77b3b0bfe0d1b38db15cdd687cb89e34 (diff)
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.c4
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: