From: Kirill Tkhai <ktkhai@virtuozzo.com>
To: martin.petersen@oracle.com, bob.liu@oracle.com, axboe@kernel.dk,
darrick.wong@oracle.com
Cc: agk@redhat.com, snitzer@redhat.com, dm-devel@redhat.com,
song@kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca,
Chaitanya.Kulkarni@wdc.com, ming.lei@redhat.com, osandov@fb.com,
jthumshirn@suse.de, minwoo.im.dev@gmail.com,
damien.lemoal@wdc.com, andrea.parri@amarulasolutions.com,
hare@suse.com, tj@kernel.org, ajay.joshi@wdc.com,
sagi@grimberg.me, dsterba@suse.com, chaitanya.kulkarni@wdc.com,
bvanassche@acm.org, dhowells@redhat.com, asml.silence@gmail.com,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
ktkhai@virtuozzo.com
Subject: [PATCH v7 6/6] loop: Add support for REQ_ALLOCATE
Date: Thu, 13 Feb 2020 10:39:35 +0300 [thread overview]
Message-ID: <158157957565.111879.5952051034259419400.stgit@localhost.localdomain> (raw)
In-Reply-To: <158157930219.111879.12072477040351921368.stgit@localhost.localdomain>
Support for new modifier of REQ_OP_WRITE_ZEROES command.
This results in allocation extents in backing file instead
of actual blocks zeroing.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
---
drivers/block/loop.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 739b372a5112..0704167a5aaa 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -581,6 +581,16 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
return 0;
}
+/* Convert REQ_OP_WRITE_ZEROES modifiers into fallocate mode */
+static unsigned int write_zeroes_to_fallocate_mode(unsigned int flags)
+{
+ if (flags & REQ_ALLOCATE)
+ return 0;
+ if (flags & REQ_NOUNMAP)
+ return FALLOC_FL_ZERO_RANGE;
+ return FALLOC_FL_PUNCH_HOLE;
+}
+
static int do_req_filebacked(struct loop_device *lo, struct request *rq)
{
struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
@@ -599,14 +609,8 @@ 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_WRITE_ZEROES:
- /*
- * If the caller doesn't want deallocation, call zeroout to
- * write zeroes the range. Otherwise, punch them out.
- */
return lo_fallocate(lo, rq, pos,
- (rq->cmd_flags & REQ_NOUNMAP) ?
- FALLOC_FL_ZERO_RANGE :
- FALLOC_FL_PUNCH_HOLE);
+ write_zeroes_to_fallocate_mode(rq->cmd_flags));
case REQ_OP_DISCARD:
return lo_fallocate(lo, rq, pos, FALLOC_FL_PUNCH_HOLE);
case REQ_OP_WRITE:
@@ -877,6 +881,7 @@ static void loop_config_discard(struct loop_device *lo)
q->limits.discard_alignment = 0;
blk_queue_max_discard_sectors(q, 0);
blk_queue_max_write_zeroes_sectors(q, 0);
+ blk_queue_max_allocate_sectors(q, 0);
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
return;
}
@@ -886,6 +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);
}
next prev parent reply other threads:[~2020-02-13 7:40 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 7:39 [PATCH v7 0/6] block: Introduce REQ_ALLOCATE flag for REQ_OP_WRITE_ZEROES Kirill Tkhai
2020-02-13 7:39 ` [PATCH v7 1/6] block: Add @flags argument to bdev_write_zeroes_sectors() Kirill Tkhai
2020-02-13 7:39 ` [PATCH v7 2/6] block: Pass op_flags into blk_queue_get_max_sectors() Kirill Tkhai
2020-02-13 7:39 ` [PATCH v7 3/6] block: Introduce blk_queue_get_max_write_zeroes_sectors() Kirill Tkhai
2020-02-13 7:39 ` [PATCH v7 4/6] block: Add support for REQ_ALLOCATE flag Kirill Tkhai
2020-02-13 7:39 ` [PATCH v7 5/6] block: Add blk_queue_max_allocate_sectors() Kirill Tkhai
2020-02-13 7:39 ` Kirill Tkhai [this message]
2020-02-13 18:11 ` [PATCH v7 6/6] loop: Add support for REQ_ALLOCATE Darrick J. Wong
2020-02-13 20:07 ` Kirill Tkhai
2020-02-13 7:55 ` [PATCH v7 0/6] block: Introduce REQ_ALLOCATE flag for REQ_OP_WRITE_ZEROES Kirill Tkhai
2020-03-06 9:11 ` Kirill Tkhai
2020-03-13 13:08 ` Kirill Tkhai
2020-03-19 10:28 ` Christoph Hellwig
2020-03-19 10:42 ` Kirill Tkhai
2020-03-19 13:03 ` Martin K. Petersen
2020-03-25 16:26 ` Darrick J. Wong
2020-03-25 16:32 ` Christoph Hellwig
2020-03-25 17:23 ` Martin K. Petersen
2020-03-26 9:29 ` Christoph Hellwig
2020-03-26 14:34 ` Martin K. Petersen
2020-03-26 14:45 ` Christoph Hellwig
2020-03-26 16:48 ` Chaitanya Kulkarni
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