mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-29 17:22:07 +00:00
6f94cbc29a
Currently the io_rsrc_node assignment in io_kiocb is an array of two pointers, as two nodes may be assigned to a request - one file node, and one buffer node. However, the buffer node can co-exist with the provided buffers, as currently it's not supported to use both provided and registered buffers at the same time. This crucially brings struct io_kiocb down to 4 cache lines again, as before it spilled into the 5th cacheline. Signed-off-by: Jens Axboe <axboe@kernel.dk>
82 lines
1.9 KiB
C
82 lines
1.9 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/io_uring.h>
|
|
|
|
#include <uapi/linux/io_uring.h>
|
|
|
|
#include "io_uring.h"
|
|
#include "rsrc.h"
|
|
#include "nop.h"
|
|
|
|
struct io_nop {
|
|
/* NOTE: kiocb has the file as the first member, so don't do it here */
|
|
struct file *file;
|
|
int result;
|
|
int fd;
|
|
int buffer;
|
|
unsigned int flags;
|
|
};
|
|
|
|
#define NOP_FLAGS (IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \
|
|
IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE)
|
|
|
|
int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
|
|
|
|
nop->flags = READ_ONCE(sqe->nop_flags);
|
|
if (nop->flags & ~NOP_FLAGS)
|
|
return -EINVAL;
|
|
|
|
if (nop->flags & IORING_NOP_INJECT_RESULT)
|
|
nop->result = READ_ONCE(sqe->len);
|
|
else
|
|
nop->result = 0;
|
|
if (nop->flags & IORING_NOP_FIXED_FILE)
|
|
nop->fd = READ_ONCE(sqe->fd);
|
|
if (nop->flags & IORING_NOP_FIXED_BUFFER)
|
|
nop->buffer = READ_ONCE(sqe->buf_index);
|
|
return 0;
|
|
}
|
|
|
|
int io_nop(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
|
|
int ret = nop->result;
|
|
|
|
if (nop->flags & IORING_NOP_FILE) {
|
|
if (nop->flags & IORING_NOP_FIXED_FILE) {
|
|
req->file = io_file_get_fixed(req, nop->fd, issue_flags);
|
|
req->flags |= REQ_F_FIXED_FILE;
|
|
} else {
|
|
req->file = io_file_get_normal(req, nop->fd);
|
|
}
|
|
if (!req->file) {
|
|
ret = -EBADF;
|
|
goto done;
|
|
}
|
|
}
|
|
if (nop->flags & IORING_NOP_FIXED_BUFFER) {
|
|
struct io_ring_ctx *ctx = req->ctx;
|
|
struct io_rsrc_node *node;
|
|
|
|
ret = -EFAULT;
|
|
io_ring_submit_lock(ctx, issue_flags);
|
|
node = io_rsrc_node_lookup(&ctx->buf_table, nop->buffer);
|
|
if (node) {
|
|
io_req_assign_rsrc_node(&req->buf_node, node);
|
|
req->flags |= REQ_F_BUF_NODE;
|
|
ret = 0;
|
|
}
|
|
io_ring_submit_unlock(ctx, issue_flags);
|
|
}
|
|
done:
|
|
if (ret < 0)
|
|
req_set_fail(req);
|
|
io_req_set_res(req, nop->result, 0);
|
|
return IOU_OK;
|
|
}
|