mirror of
https://github.com/torvalds/linux.git
synced 2024-11-21 19:46:16 +00:00
0d98c50908
`io_rsrc_node` instance won't be shared among different io_uring ctxs, and its allocation 'ctx' is always same with the user's 'ctx', so it is safe to pass user 'ctx' reference to rsrc helpers. Even in io_clone_buffers(), `io_rsrc_node` instance is allocated actually for destination io_uring_ctx. Then io_rsrc_node_ctx() can be removed, and the 8 bytes `ctx` pointer will be removed from `io_rsrc_node` in the following patch. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20241107110149.890530-2-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
// 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.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;
|
|
struct io_rsrc_node *rsrc_node;
|
|
};
|
|
|
|
static int __io_splice_prep(struct io_kiocb *req,
|
|
const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
|
|
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);
|
|
sp->rsrc_node = NULL;
|
|
req->flags |= REQ_F_FORCE_ASYNC;
|
|
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);
|
|
}
|
|
|
|
void io_splice_cleanup(struct io_kiocb *req)
|
|
{
|
|
struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
|
|
|
|
io_put_rsrc_node(req->ctx, sp->rsrc_node);
|
|
}
|
|
|
|
static struct file *io_splice_get_file(struct io_kiocb *req,
|
|
unsigned int issue_flags)
|
|
{
|
|
struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
|
|
struct io_ring_ctx *ctx = req->ctx;
|
|
struct io_rsrc_node *node;
|
|
struct file *file = NULL;
|
|
|
|
if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
|
|
return io_file_get_normal(req, sp->splice_fd_in);
|
|
|
|
io_ring_submit_lock(ctx, issue_flags);
|
|
node = io_rsrc_node_lookup(&ctx->file_table.data, sp->splice_fd_in);
|
|
if (node) {
|
|
node->refs++;
|
|
sp->rsrc_node = node;
|
|
file = io_slot_file(node);
|
|
req->flags |= REQ_F_NEED_CLEANUP;
|
|
}
|
|
io_ring_submit_unlock(ctx, issue_flags);
|
|
return file;
|
|
}
|
|
|
|
int io_tee(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
|
|
struct file *out = sp->file_out;
|
|
unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
|
|
struct file *in;
|
|
ssize_t ret = 0;
|
|
|
|
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
|
|
|
|
in = io_splice_get_file(req, issue_flags);
|
|
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))
|
|
fput(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, struct io_splice);
|
|
|
|
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 io_splice);
|
|
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;
|
|
ssize_t ret = 0;
|
|
|
|
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
|
|
|
|
in = io_splice_get_file(req, issue_flags);
|
|
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))
|
|
fput(in);
|
|
done:
|
|
if (ret != sp->len)
|
|
req_set_fail(req);
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|