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WDCIronportException: Internal
From:   Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
To:     hch@lst.de, martin.petersen@oracle.com
Cc:     darrick.wong@oracle.com, axboe@kernel.dk, tytso@mit.edu,
        adilger.kernel@dilger.ca, ming.lei@redhat.com, jthumshirn@suse.de,
        minwoo.im.dev@gmail.com, chaitanya.kulkarni@wdc.com,
        damien.lemoal@wdc.com, andrea.parri@amarulasolutions.com,
        hare@suse.com, tj@kernel.org, hannes@cmpxchg.org,
        khlebnikov@yandex-team.ru, ajay.joshi@wdc.com, bvanassche@acm.org,
        arnd@arndb.de, houtao1@huawei.com, asml.silence@gmail.com,
        linux-block@vger.kernel.org, linux-ext4@vger.kernel.org,
        Kirill Tkhai <ktkhai@virtuozzo.com>
Subject: [PATCH 3/4] loop: Forward REQ_OP_ASSIGN_RANGE into fallocate(0)
Date:   Sun, 29 Mar 2020 10:47:13 -0700
Message-Id: <20200329174714.32416-4-chaitanya.kulkarni@wdc.com>
In-Reply-To: <20200329174714.32416-1-chaitanya.kulkarni@wdc.com>
References: <20200329174714.32416-1-chaitanya.kulkarni@wdc.com>
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From: Kirill Tkhai <ktkhai@virtuozzo.com>

From: Kirill Tkhai <ktkhai@virtuozzo.com>

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

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

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 739b372a5112..0a28db66c485 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -609,6 +609,8 @@ 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_ASSIGN_RANGE:
+		return lo_fallocate(lo, rq, pos, 0);
 	case REQ_OP_WRITE:
 		if (lo->transfer)
 			return lo_write_transfer(lo, rq, pos);
@@ -876,6 +878,7 @@ 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_assign_range_sectors(q, 0);
 		blk_queue_max_write_zeroes_sectors(q, 0);
 		blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 		return;
@@ -886,6 +889,7 @@ 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_assign_range_sectors(q, UINT_MAX >> 9);
 	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 }
 
@@ -1917,6 +1921,7 @@ 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_ASSIGN_RANGE:
 		cmd->use_aio = false;
 		break;
 	default:
-- 
2.22.0