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io_uring: split out splice related operations 

This splits out splice and tee support.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-05-24 21:19:47 -06:00
parent 11aeb71406
commit 531113bbd5
5 changed files with 154 additions and 130 deletions
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2
io_uring/Makefile
View File

@ -2,5 +2,5 @@
#
# Makefile for io_uring
obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o
obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o splice.o
obj-$(CONFIG_IO_WQ) += io-wq.o

133
io_uring/io_uring.c
View File

@ -95,6 +95,7 @@
#include "xattr.h"
#include "nop.h"
#include "fs.h"
#include "splice.h"
#define IORING_MAX_ENTRIES 32768
#define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES)
@ -436,15 +437,6 @@ struct io_epoll {
struct epoll_event event;
};
struct io_splice {
struct file *file_out;
loff_t off_out;
loff_t off_in;
u64 len;
int splice_fd_in;
unsigned int flags;
};
struct io_provide_buf {
struct file *file;
__u64 addr;
@ -596,9 +588,6 @@ static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
struct io_uring_rsrc_update2 *up,
unsigned nr_args);
static void io_clean_op(struct io_kiocb *req);
static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
unsigned issue_flags);
static struct file *io_file_get_normal(struct io_kiocb *req, int fd);
static void io_queue_sqe(struct io_kiocb *req);
static void io_rsrc_put_work(struct work_struct *work);
@ -1078,15 +1067,6 @@ static inline bool req_has_async_data(struct io_kiocb *req)
return req->flags & REQ_F_ASYNC_DATA;
}
static inline void req_set_fail(struct io_kiocb *req)
{
req->flags |= REQ_F_FAIL;
if (req->flags & REQ_F_CQE_SKIP) {
req->flags &= ~REQ_F_CQE_SKIP;
req->flags |= REQ_F_SKIP_LINK_CQES;
}
}
static inline void req_fail_link_node(struct io_kiocb *req, int res)
{
req_set_fail(req);
@ -1941,12 +1921,6 @@ static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx)
return container_of(node, struct io_kiocb, comp_list);
}
static inline void io_put_file(struct file *file)
{
if (file)
fput(file);
}
static inline void io_dismantle_req(struct io_kiocb *req)
{
unsigned int flags = req->flags;
@ -3919,105 +3893,6 @@ static int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
return IOU_ISSUE_SKIP_COMPLETE;
}
static int __io_splice_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
struct io_splice *sp = io_kiocb_to_cmd(req);
unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL;
sp->len = READ_ONCE(sqe->len);
sp->flags = READ_ONCE(sqe->splice_flags);
if (unlikely(sp->flags & ~valid_flags))
return -EINVAL;
sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in);
return 0;
}
static int io_tee_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off))
return -EINVAL;
return __io_splice_prep(req, sqe);
}
static int io_tee(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_splice *sp = io_kiocb_to_cmd(req);
struct file *out = sp->file_out;
unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
struct file *in;
long ret = 0;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
if (sp->flags & SPLICE_F_FD_IN_FIXED)
in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
else
in = io_file_get_normal(req, sp->splice_fd_in);
if (!in) {
ret = -EBADF;
goto done;
}
if (sp->len)
ret = do_tee(in, out, sp->len, flags);
if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
io_put_file(in);
done:
if (ret != sp->len)
req_set_fail(req);
io_req_set_res(req, ret, 0);
return IOU_OK;
}
static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_splice *sp = io_kiocb_to_cmd(req);
sp->off_in = READ_ONCE(sqe->splice_off_in);
sp->off_out = READ_ONCE(sqe->off);
return __io_splice_prep(req, sqe);
}
static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_splice *sp = io_kiocb_to_cmd(req);
struct file *out = sp->file_out;
unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
loff_t *poff_in, *poff_out;
struct file *in;
long ret = 0;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
if (sp->flags & SPLICE_F_FD_IN_FIXED)
in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
else
in = io_file_get_normal(req, sp->splice_fd_in);
if (!in) {
ret = -EBADF;
goto done;
}
poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
if (sp->len)
ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);
if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
io_put_file(in);
done:
if (ret != sp->len)
req_set_fail(req);
io_req_set_res(req, ret, 0);
return IOU_OK;
}
static int io_msg_ring_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@ -7157,8 +7032,8 @@ static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file
file_slot->file_ptr = file_ptr;
}
static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
unsigned int issue_flags)
inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
unsigned int issue_flags)
{
struct io_ring_ctx *ctx = req->ctx;
struct file *file = NULL;
@ -7181,7 +7056,7 @@ out:
return file;
}
static struct file *io_file_get_normal(struct io_kiocb *req, int fd)
struct file *io_file_get_normal(struct io_kiocb *req, int fd)
{
struct file *file = fget(fd);

19
io_uring/io_uring.h
View File

@ -9,10 +9,29 @@ enum {
IOU_ISSUE_SKIP_COMPLETE = -EIOCBQUEUED,
};
static inline void req_set_fail(struct io_kiocb *req)
{
req->flags |= REQ_F_FAIL;
if (req->flags & REQ_F_CQE_SKIP) {
req->flags &= ~REQ_F_CQE_SKIP;
req->flags |= REQ_F_SKIP_LINK_CQES;
}
}
static inline void io_req_set_res(struct io_kiocb *req, s32 res, u32 cflags)
{
req->cqe.res = res;
req->cqe.flags = cflags;
}
static inline void io_put_file(struct file *file)
{
if (file)
fput(file);
}
struct file *io_file_get_normal(struct io_kiocb *req, int fd);
struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
unsigned issue_flags);
#endif

123
io_uring/splice.c Normal file
View File

@ -0,0 +1,123 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/io_uring.h>
#include <linux/splice.h>
#include <uapi/linux/io_uring.h>
#include "io_uring_types.h"
#include "io_uring.h"
#include "splice.h"
struct io_splice {
struct file *file_out;
loff_t off_out;
loff_t off_in;
u64 len;
int splice_fd_in;
unsigned int flags;
};
static int __io_splice_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
struct io_splice *sp = io_kiocb_to_cmd(req);
unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL;
sp->len = READ_ONCE(sqe->len);
sp->flags = READ_ONCE(sqe->splice_flags);
if (unlikely(sp->flags & ~valid_flags))
return -EINVAL;
sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in);
return 0;
}
int io_tee_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off))
return -EINVAL;
return __io_splice_prep(req, sqe);
}
int io_tee(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_splice *sp = io_kiocb_to_cmd(req);
struct file *out = sp->file_out;
unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
struct file *in;
long ret = 0;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
if (sp->flags & SPLICE_F_FD_IN_FIXED)
in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
else
in = io_file_get_normal(req, sp->splice_fd_in);
if (!in) {
ret = -EBADF;
goto done;
}
if (sp->len)
ret = do_tee(in, out, sp->len, flags);
if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
io_put_file(in);
done:
if (ret != sp->len)
req_set_fail(req);
io_req_set_res(req, ret, 0);
return IOU_OK;
}
int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_splice *sp = io_kiocb_to_cmd(req);
sp->off_in = READ_ONCE(sqe->splice_off_in);
sp->off_out = READ_ONCE(sqe->off);
return __io_splice_prep(req, sqe);
}
int io_splice(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_splice *sp = io_kiocb_to_cmd(req);
struct file *out = sp->file_out;
unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
loff_t *poff_in, *poff_out;
struct file *in;
long ret = 0;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
if (sp->flags & SPLICE_F_FD_IN_FIXED)
in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
else
in = io_file_get_normal(req, sp->splice_fd_in);
if (!in) {
ret = -EBADF;
goto done;
}
poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
if (sp->len)
ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);
if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
io_put_file(in);
done:
if (ret != sp->len)
req_set_fail(req);
io_req_set_res(req, ret, 0);
return IOU_OK;
}

7
io_uring/splice.h Normal file
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@ -0,0 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
int io_tee_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_tee(struct io_kiocb *req, unsigned int issue_flags);
int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_splice(struct io_kiocb *req, unsigned int issue_flags);