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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,
linux-block@vger.kernel.org, ming.lei@redhat.com,
gost.dev@samsung.com, Anuj Gupta <anuj20.g@samsung.com>,
Kanchan Joshi <joshi.k@samsung.com>
Subject: [PATCH for-next 1/4] io_uring: introduce io_uring_cmd_import_fixed
Date: Fri, 19 Aug 2022 16:00:18 +0530
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References: <20220819103021.240340-1-joshi.k@samsung.com>
<CGME20220819104036epcas5p2bb4d9b2cccbdfcdb460e085abe7fd1a8@epcas5p2.samsung.com>
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List-ID: <io-uring.vger.kernel.org>
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From: Anuj Gupta <anuj20.g@samsung.com>
This is a new helper that callers can use to obtain a bvec iterator for
the previously mapped buffer. This is preparatory work to enable
fixed-buffer support for io_uring_cmd.
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
---
include/linux/io_uring.h | 7 +++++++
io_uring/uring_cmd.c | 10 ++++++++++
2 files changed, 17 insertions(+)
diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 58676c0a398f..60aba10468fc 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -32,6 +32,8 @@ struct io_uring_cmd {
};
#if defined(CONFIG_IO_URING)
+int io_uring_cmd_import_fixed(u64 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, ssize_t res2);
void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
void (*task_work_cb)(struct io_uring_cmd *));
@@ -59,6 +61,11 @@ static inline void io_uring_free(struct task_struct *tsk)
__io_uring_free(tsk);
}
#else
+int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
+ struct iov_iter *iter, void *ioucmd)
+{
+ return -1;
+}
static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
ssize_t ret2)
{
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index 8900856fa588..ff65cc8ab6cc 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -121,3 +121,13 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
return IOU_ISSUE_SKIP_COMPLETE;
}
+
+int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len,
+ int rw, struct iov_iter *iter, void *ioucmd)
+{
+ struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd);
+ struct io_mapped_ubuf *imu = req->imu;
+
+ return io_import_fixed(rw, iter, imu, ubuf, len);
+}
+EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
--
2.25.1