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From: Kanchan Joshi <joshi.k@samsung.com>
To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org
Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org,
	anuj20.g@samsung.com, javier.gonz@samsung.com, hare@suse.de,
	Kanchan Joshi <joshi.k@samsung.com>
Subject: [RFC PATCH 4/6] io_uring: add helper for fixed-buffer uring-cmd
Date: Thu,  5 Aug 2021 18:25:37 +0530	[thread overview]
Message-ID: <20210805125539.66958-5-joshi.k@samsung.com> (raw)
In-Reply-To: <20210805125539.66958-1-joshi.k@samsung.com>

Refactor the existing code and factor out helper that can be used
for passthrough with fixed-buffer. This is a prep patch.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
---
 fs/io_uring.c            | 21 +++++++++++++++------
 include/linux/io_uring.h |  7 +++++++
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3361056313a7..1f2263a78c8e 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2792,12 +2792,10 @@ static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
 		}
 	}
 }
-
-static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter,
-			     struct io_mapped_ubuf *imu)
+static int __io_import_fixed(u64 buf_addr, size_t len, int rw,
+			struct iov_iter *iter, struct io_mapped_ubuf *imu)
 {
-	size_t len = req->rw.len;
-	u64 buf_end, buf_addr = req->rw.addr;
+	u64 buf_end;
 	size_t offset;
 
 	if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end)))
@@ -2864,8 +2862,19 @@ static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter)
 		imu = READ_ONCE(ctx->user_bufs[index]);
 		req->imu = imu;
 	}
-	return __io_import_fixed(req, rw, iter, imu);
+	return __io_import_fixed(req->rw.addr, req->rw.len, rw, iter, imu);
+}
+
+int io_uring_cmd_import_fixed(void *ubuf, unsigned long len,
+		int rw, struct iov_iter *iter, void *ioucmd)
+{
+	u64 buf_addr = (u64)ubuf;
+	struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd);
+	struct io_mapped_ubuf *imu = req->imu;
+
+	return __io_import_fixed(buf_addr, len, rw, iter, imu);
 }
+EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
 
 static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock)
 {
diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 235d1603f97e..0bd8f611edb8 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -20,6 +20,8 @@ struct io_uring_cmd {
 };
 
 #if defined(CONFIG_IO_URING)
+int io_uring_cmd_import_fixed(void *ubuf, unsigned long len,
+		int rw, struct iov_iter *iter, void *ioucmd);
 void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret);
 void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
 			void (*driver_cb)(struct io_uring_cmd *));
@@ -49,6 +51,11 @@ static inline void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
 			void (*driver_cb)(struct io_uring_cmd *))
 {
 }
+int io_uring_cmd_import_fixed(void *ubuf, unsigned long len,
+		int rw, struct iov_iter *iter, void *ioucmd)
+{
+	return -1;
+}
 static inline struct sock *io_uring_get_socket(struct file *file)
 {
 	return NULL;
-- 
2.25.1


  parent reply	other threads:[~2021-08-05 13:16 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210805125910epcas5p1100e7093dd2b1ac5bbb751331e2ded23@epcas5p1.samsung.com>
2021-08-05 12:55 ` [RFC PATCH 0/6] Fixed-buffers io_uring passthrough over nvme-char Kanchan Joshi
     [not found]   ` <CGME20210805125917epcas5p4f75c9423a7b886dc79500901cc8f55ab@epcas5p4.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 1/6] io_uring: add infra for uring_cmd completion in submitter-task Kanchan Joshi
     [not found]   ` <CGME20210805125923epcas5p10e6c1b95475440be68f58244d5a3cb9a@epcas5p1.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 2/6] nvme: wire-up support for async-passthru on char-device Kanchan Joshi
2021-09-07  7:46       ` Christoph Hellwig
2021-09-07 16:20         ` Kanchan Joshi
2021-09-08  6:15           ` Christoph Hellwig
2021-09-22  7:19             ` Kanchan Joshi
     [not found]   ` <CGME20210805125927epcas5p28f3413fe3d0a2baed37a05453df0d482@epcas5p2.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 3/6] io_uring: mark iopoll not supported for uring-cmd Kanchan Joshi
     [not found]   ` <CGME20210805125931epcas5p259fec172085ea34fdbf5a1c1f8da5e90@epcas5p2.samsung.com>
2021-08-05 12:55     ` Kanchan Joshi [this message]
2021-09-07  7:47       ` [RFC PATCH 4/6] io_uring: add helper for fixed-buffer uring-cmd Christoph Hellwig
     [not found]   ` <CGME20210805125934epcas5p4ff88e95d558ad9f65d77a888a4211b18@epcas5p4.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 5/6] io_uring: add support for uring_cmd with fixed-buffer Kanchan Joshi
2021-09-07  7:48       ` Christoph Hellwig
2021-09-07 16:29         ` Kanchan Joshi
     [not found]   ` <CGME20210805125937epcas5p15667b460e28d87bd40400f69005aafe3@epcas5p1.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 6/6] nvme: enable passthrough " Kanchan Joshi
2021-09-07  7:50       ` Christoph Hellwig
2021-09-07 16:47         ` Kanchan Joshi
2021-09-08  6:16           ` Christoph Hellwig
2021-09-07  7:10   ` [RFC PATCH 0/6] Fixed-buffers io_uring passthrough over nvme-char Christoph Hellwig
2021-09-07 12:38     ` Jens Axboe

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