linux-ext4 - [PATCH V2 3/4] loop: Forward REQ_OP

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Date:   Mon,  6 Apr 2020 15:21:47 -0700
From:   Chaitanya Kulkarni <chaitanya.kulkarni@....com>
To:     hch@....de, martin.petersen@...cle.com
Cc:     darrick.wong@...cle.com, axboe@...nel.dk, tytso@....edu,
        adilger.kernel@...ger.ca, ming.lei@...hat.com, jthumshirn@...e.de,
        minwoo.im.dev@...il.com, chaitanya.kulkarni@....com,
        damien.lemoal@....com, andrea.parri@...rulasolutions.com,
        hare@...e.com, tj@...nel.org, hannes@...xchg.org,
        khlebnikov@...dex-team.ru, ajay.joshi@....com, bvanassche@....org,
        arnd@...db.de, houtao1@...wei.com, asml.silence@...il.com,
        ktkhai@...tuozzo.com, linux-block@...r.kernel.org,
        linux-ext4@...r.kernel.org
Subject: [PATCH V2 3/4] loop: Forward REQ_OP_ALLOCATE into fallocate(0)

From: Kirill Tkhai <ktkhai@...tuozzo.com>

Send fallocate(0) request into underlining filesystem after upper
filesystem sent REQ_OP_ALLOCATE request to block device.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
[Use blk_queue_max_allocate_sectors() from newly updated previous
 patch.]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
---
 drivers/block/loop.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index a42c49e04954..26ff16e34f5a 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -611,6 +611,8 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)
 				FALLOC_FL_PUNCH_HOLE);
 	case REQ_OP_DISCARD:
 		return lo_fallocate(lo, rq, pos, FALLOC_FL_PUNCH_HOLE);
+	case REQ_OP_ALLOCATE:
+		return lo_fallocate(lo, rq, pos, 0);
 	case REQ_OP_WRITE:
 		if (lo->transfer)
 			return lo_write_transfer(lo, rq, pos);
@@ -878,6 +880,7 @@ 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_allocate_sectors(q, 0);
 		blk_queue_max_write_zeroes_sectors(q, 0);
 		blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 		return;
@@ -888,6 +891,7 @@ static void loop_config_discard(struct loop_device *lo)
 
 	blk_queue_max_discard_sectors(q, UINT_MAX >> 9);
 	blk_queue_max_write_zeroes_sectors(q, UINT_MAX >> 9);
+	blk_queue_max_allocate_sectors(q, UINT_MAX >> 9);
 	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 }
 
@@ -1919,6 +1923,7 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 	case REQ_OP_FLUSH:
 	case REQ_OP_DISCARD:
 	case REQ_OP_WRITE_ZEROES:
+	case REQ_OP_ALLOCATE:
 		cmd->use_aio = false;
 		break;
 	default:
-- 
2.22.0