linux-IllusionX/io_uring/truncate.c
Tony Solomonik b4bb1900c1 io_uring: add support for ftruncate
Adds support for doing truncate through io_uring, eliminating
the need for applications to roll their own thread pool or offload
mechanism to be able to do non-blocking truncates.

Signed-off-by: Tony Solomonik <tony.solomonik@gmail.com>
Link: https://lore.kernel.org/r/20240202121724.17461-3-tony.solomonik@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2024-02-09 09:04:39 -07:00

48 lines
1 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/syscalls.h>
#include <linux/io_uring.h>
#include <uapi/linux/io_uring.h>
#include "../fs/internal.h"
#include "io_uring.h"
#include "truncate.h"
struct io_ftrunc {
struct file *file;
loff_t len;
};
int io_ftruncate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc);
if (sqe->rw_flags || sqe->addr || sqe->len || sqe->buf_index ||
sqe->splice_fd_in || sqe->addr3)
return -EINVAL;
ft->len = READ_ONCE(sqe->off);
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
int io_ftruncate(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc);
int ret;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_ftruncate(req->file, ft->len, 1);
io_req_set_res(req, ret, 0);
return IOU_OK;
}