Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 19372e27 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 31edeacd

drivers/block/loop.c

+4 −0
Original line number Diff line number Diff line
@@ -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: