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authorPavel Begunkov <asml.silence@gmail.com>2020-02-24 19:03:49 +0300
committerJens Axboe <axboe@kernel.dk>2020-02-24 09:08:25 -0700
commit4f4eff4ca75f7ef843834ab8e66655438b1cf82f (patch)
treeda307c06b8e6a160c6c2c0cb3f2c77292d80712c
parent1b5c910775a5967b63a7632add2f4d00d3722036 (diff)
downloadliburing-4f4eff4ca75f7ef843834ab8e66655438b1cf82f.tar.gz
liburing-4f4eff4ca75f7ef843834ab8e66655438b1cf82f.tar.bz2
splice: add splice(2) helpers
Add splice helpers and update io_uring.h Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--src/include/liburing.h12
-rw-r--r--src/include/liburing/io_uring.h14
2 files changed, 25 insertions, 1 deletions
diff --git a/src/include/liburing.h b/src/include/liburing.h
index b8bcdf5..7edd4f1 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 inline 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,
+ unsigned 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 7e7c2d9..a3d5e25 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 splice_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;
+ __s32 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,
@@ -129,6 +135,12 @@ enum {
#define IORING_TIMEOUT_ABS (1U << 0)
/*
+ * sqe->splice_flags
+ * extends splice(2) flags
+ */
+#define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */
+
+/*
* IO completion data structure (Completion Queue Entry)
*/
struct io_uring_cqe {