b4bb1900c1
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>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/syscalls.h>
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#include <linux/io_uring.h>
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#include <uapi/linux/io_uring.h>
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#include "../fs/internal.h"
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#include "io_uring.h"
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#include "truncate.h"
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struct io_ftrunc {
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struct file *file;
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loff_t len;
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};
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int io_ftruncate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc);
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if (sqe->rw_flags || sqe->addr || sqe->len || sqe->buf_index ||
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sqe->splice_fd_in || sqe->addr3)
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return -EINVAL;
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ft->len = READ_ONCE(sqe->off);
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req->flags |= REQ_F_FORCE_ASYNC;
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return 0;
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}
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int io_ftruncate(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc);
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int ret;
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = do_ftruncate(req->file, ft->len, 1);
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io_req_set_res(req, ret, 0);
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return IOU_OK;
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}
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