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From: Ming Lei <[email protected]>
To: Jens Axboe <[email protected]>,
	[email protected], [email protected]
Cc: [email protected],
	Miklos Szeredi <[email protected]>,
	ZiyangZhang <[email protected]>,
	Xiaoguang Wang <[email protected]>,
	Bernd Schubert <[email protected]>,
	Pavel Begunkov <[email protected]>,
	Stefan Hajnoczi <[email protected]>,
	Ming Lei <[email protected]>
Subject: [PATCH V4 14/17] block: ublk_drv: support to copy any part of request pages
Date: Fri, 24 Mar 2023 21:58:05 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Add 'offset' to 'struct ublk_map_data', so that ublk_copy_user_pages()
can be used to copy any sub-buffer(linear mapped) of the request.

Signed-off-by: Ming Lei <[email protected]>
---
 drivers/block/ublk_drv.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 88d5a657834d..26a14c54da1d 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -511,19 +511,36 @@ static void ublk_copy_io_pages(struct ublk_io_iter *data,
 	}
 }
 
+static bool ublk_advance_io_iter(const struct request *req,
+		struct ublk_io_iter *iter, unsigned int offset)
+{
+	struct bio *bio = req->bio;
+
+	for_each_bio(bio) {
+		if (bio->bi_iter.bi_size > offset) {
+			iter->bio = bio;
+			iter->iter = bio->bi_iter;
+			bio_advance_iter(iter->bio, &iter->iter, offset);
+			return true;
+		}
+		offset -= bio->bi_iter.bi_size;
+	}
+	return false;
+}
+
 /*
  * Copy data between request pages and io_iter, and 'offset'
  * is the start point of linear offset of request.
  */
 static size_t ublk_copy_user_pages(const struct request *req,
-		struct iov_iter *uiter, int dir)
+		unsigned offset, struct iov_iter *uiter, int dir)
 {
-	struct ublk_io_iter iter = {
-		.bio	= req->bio,
-		.iter	= req->bio->bi_iter,
-	};
+	struct ublk_io_iter iter;
 	size_t done = 0;
 
+	if (!ublk_advance_io_iter(req, &iter, offset))
+		return 0;
+
 	while (iov_iter_count(uiter) && iter.bio) {
 		unsigned nr_pages;
 		size_t len, off;
@@ -576,7 +593,7 @@ static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req,
 		import_single_range(dir, u64_to_user_ptr(io->addr), rq_bytes,
 				&iov, &iter);
 
-		return ublk_copy_user_pages(req, &iter, dir);
+		return ublk_copy_user_pages(req, 0, &iter, dir);
 	}
 	return rq_bytes;
 }
@@ -596,7 +613,7 @@ static int ublk_unmap_io(const struct ublk_queue *ubq,
 
 		import_single_range(dir, u64_to_user_ptr(io->addr), io->res,
 				&iov, &iter);
-		return ublk_copy_user_pages(req, &iter, dir);
+		return ublk_copy_user_pages(req, 0, &iter, dir);
 	}
 	return rq_bytes;
 }
-- 
2.39.2


  parent reply	other threads:[~2023-03-24 14:01 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20230324135916epcas5p37aad4c49c76c05567a484377d8909092@epcas5p3.samsung.com>
2023-03-24 13:57 ` [PATCH V4 00/17] io_uring/ublk: add IORING_OP_FUSED_CMD Ming Lei
2023-03-24 13:57   ` [PATCH V4 01/17] io_uring: increase io_kiocb->flags into 64bit Ming Lei
2023-03-24 13:57   ` [PATCH V4 02/17] io_uring: add IORING_OP_FUSED_CMD Ming Lei
2023-03-24 13:57   ` [PATCH V4 03/17] io_uring: support normal SQE for fused command Ming Lei
2023-03-24 13:57   ` [PATCH V4 04/17] io_uring: support OP_READ/OP_WRITE for fused slave request Ming Lei
2023-03-24 13:57   ` [PATCH V4 05/17] io_uring: support OP_SEND_ZC/OP_RECV " Ming Lei
2023-03-24 13:57   ` [PATCH V4 06/17] block: ublk_drv: mark device as LIVE before adding disk Ming Lei
2023-03-24 13:57   ` [PATCH V4 07/17] block: ublk_drv: add common exit handling Ming Lei
2023-03-24 13:57   ` [PATCH V4 08/17] block: ublk_drv: don't consider flush request in map/unmap io Ming Lei
2023-03-24 13:58   ` [PATCH V4 09/17] block: ublk_drv: add two helpers to clean up map/unmap request Ming Lei
2023-03-24 13:58   ` [PATCH V4 10/17] block: ublk_drv: clean up several helpers Ming Lei
2023-03-24 13:58   ` [PATCH V4 11/17] block: ublk_drv: cleanup 'struct ublk_map_data' Ming Lei
2023-03-24 13:58   ` [PATCH V4 12/17] block: ublk_drv: cleanup ublk_copy_user_pages Ming Lei
2023-03-24 13:58   ` [PATCH V4 13/17] block: ublk_drv: grab request reference when the request is handled by userspace Ming Lei
2023-03-24 13:58   ` Ming Lei [this message]
2023-03-24 13:58   ` [PATCH V4 15/17] block: ublk_drv: add read()/write() support for ublk char device Ming Lei
2023-03-24 13:58   ` [PATCH V4 16/17] block: ublk_drv: don't check buffer in case of zero copy Ming Lei
2023-03-24 13:58   ` [PATCH V4 17/17] block: ublk_drv: apply io_uring FUSED_CMD for supporting " Ming Lei
2023-03-28  0:36   ` [PATCH V4 00/17] io_uring/ublk: add IORING_OP_FUSED_CMD Dan Williams
2023-03-28  1:16     ` Ming Lei
2023-03-28  1:29       ` Jens Axboe
2023-03-28  1:35         ` Ming Lei
2023-03-28  1:31       ` Dan Williams
2023-03-28  2:02         ` Ming Lei
2023-03-28  6:32           ` Dan Williams
2023-03-28  3:13       ` Gao Xiang
2023-03-28  3:33         ` Ming Lei
2023-03-28  5:10   ` Kanchan Joshi

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