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Subject[PATCH liburing 1/2] splice: add splice(2) helpers
Date
Add splice helpers and update io_uring.h

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
src/include/liburing.h | 12 ++++++++++++
src/include/liburing/io_uring.h | 14 +++++++++++++-
2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/include/liburing.h b/src/include/liburing.h
index 8ca6cd9..16ccadd 100644
--- a/src/include/liburing.h
+++ b/src/include/liburing.h
@@ -191,6 +191,18 @@ static inline void io_uring_prep_rw(int op, struct io_uring_sqe *sqe, int fd,
sqe->__pad2[0] = sqe->__pad2[1] = sqe->__pad2[2] = 0;
}

+static void io_uring_prep_splice(struct io_uring_sqe *sqe,
+ int fd_in, loff_t off_in,
+ int fd_out, loff_t off_out,
+ unsigned int nbytes, int splice_flags)
+{
+ io_uring_prep_rw(IORING_OP_SPLICE, sqe, fd_out, (void *)off_in,
+ nbytes, off_out);
+ sqe->splice_fd_in = fd_in;
+ sqe->splice_flags = splice_flags;
+}
+
+
static inline void io_uring_prep_readv(struct io_uring_sqe *sqe, int fd,
const struct iovec *iovecs,
unsigned nr_vecs, off_t offset)
diff --git a/src/include/liburing/io_uring.h b/src/include/liburing/io_uring.h
index 424fb4b..0623e00 100644
--- a/src/include/liburing/io_uring.h
+++ b/src/include/liburing/io_uring.h
@@ -23,7 +23,10 @@ struct io_uring_sqe {
__u64 off; /* offset into file */
__u64 addr2;
};
- __u64 addr; /* pointer to buffer or iovecs */
+ union {
+ __u64 addr; /* pointer to buffer or iovecs */
+ __u64 off_in;
+ };
__u32 len; /* buffer size or number of iovecs */
union {
__kernel_rwf_t rw_flags;
@@ -37,6 +40,7 @@ struct io_uring_sqe {
__u32 open_flags;
__u32 statx_flags;
__u32 fadvise_advice;
+ __u32 splice_flags;
};
__u64 user_data; /* data to be passed back at completion time */
union {
@@ -45,6 +49,7 @@ struct io_uring_sqe {
__u16 buf_index;
/* personality to use, if used */
__u16 personality;
+ __u32 splice_fd_in;
};
__u64 __pad2[3];
};
@@ -113,6 +118,7 @@ enum {
IORING_OP_RECV,
IORING_OP_OPENAT2,
IORING_OP_EPOLL_CTL,
+ IORING_OP_SPLICE,

/* this goes last, obviously */
IORING_OP_LAST,
@@ -128,6 +134,12 @@ enum {
*/
#define IORING_TIMEOUT_ABS (1U << 0)

+/*
+ * sqe->splice_flags
+ * extends splice(2) flags
+ */
+#define SPLICE_F_FD_IN_FIXED (1U << 31) /* last bit for __u32 */
+
/*
* IO completion data structure (Completion Queue Entry)
*/
--
2.24.0
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