mirror of
https://github.com/torvalds/linux
synced 2024-09-06 09:51:23 +00:00
![Dylan Yudaken](/assets/img/avatar_default.png)
Some requests require being run async as they do not support non-blocking. Instead of trying to issue these requests, getting -EAGAIN and then queueing them for async issue, rather just force async upfront. Add WARN_ON_ONCE to make sure surprising code paths do not come up, however in those cases the bug would end up being a blocking io_uring_enter(2) which should not be critical. Signed-off-by: Dylan Yudaken <dylany@meta.com> Link: https://lore.kernel.org/r/20230127135227.3646353-3-dylany@meta.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
113 lines
2.8 KiB
C
113 lines
2.8 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/fsnotify.h>
|
|
|
|
#include <uapi/linux/io_uring.h>
|
|
|
|
#include "io_uring.h"
|
|
#include "sync.h"
|
|
|
|
struct io_sync {
|
|
struct file *file;
|
|
loff_t len;
|
|
loff_t off;
|
|
int flags;
|
|
int mode;
|
|
};
|
|
|
|
int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
|
|
|
|
if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in))
|
|
return -EINVAL;
|
|
|
|
sync->off = READ_ONCE(sqe->off);
|
|
sync->len = READ_ONCE(sqe->len);
|
|
sync->flags = READ_ONCE(sqe->sync_range_flags);
|
|
req->flags |= REQ_F_FORCE_ASYNC;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
|
|
int ret;
|
|
|
|
/* sync_file_range always requires a blocking context */
|
|
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
|
|
|
|
ret = sync_file_range(req->file, sync->off, sync->len, sync->flags);
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|
|
|
|
int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
|
|
|
|
if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in))
|
|
return -EINVAL;
|
|
|
|
sync->flags = READ_ONCE(sqe->fsync_flags);
|
|
if (unlikely(sync->flags & ~IORING_FSYNC_DATASYNC))
|
|
return -EINVAL;
|
|
|
|
sync->off = READ_ONCE(sqe->off);
|
|
sync->len = READ_ONCE(sqe->len);
|
|
req->flags |= REQ_F_FORCE_ASYNC;
|
|
return 0;
|
|
}
|
|
|
|
int io_fsync(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
|
|
loff_t end = sync->off + sync->len;
|
|
int ret;
|
|
|
|
/* fsync always requires a blocking context */
|
|
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
|
|
|
|
ret = vfs_fsync_range(req->file, sync->off, end > 0 ? end : LLONG_MAX,
|
|
sync->flags & IORING_FSYNC_DATASYNC);
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|
|
|
|
int io_fallocate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
|
|
|
|
if (sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
|
|
return -EINVAL;
|
|
|
|
sync->off = READ_ONCE(sqe->off);
|
|
sync->len = READ_ONCE(sqe->addr);
|
|
sync->mode = READ_ONCE(sqe->len);
|
|
req->flags |= REQ_F_FORCE_ASYNC;
|
|
return 0;
|
|
}
|
|
|
|
int io_fallocate(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
|
|
int ret;
|
|
|
|
/* fallocate always requiring blocking context */
|
|
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
|
|
|
|
ret = vfs_fallocate(req->file, sync->mode, sync->off, sync->len);
|
|
if (ret >= 0)
|
|
fsnotify_modify(req->file);
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|