forked from mirrors/linux
aebb224fd4
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>
112 lines
2.8 KiB
C
112 lines
2.8 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/namei.h>
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#include <linux/io_uring.h>
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#include <linux/fsnotify.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "sync.h"
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struct io_sync {
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struct file *file;
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loff_t len;
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loff_t off;
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int flags;
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int mode;
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};
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int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
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if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in))
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return -EINVAL;
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sync->off = READ_ONCE(sqe->off);
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sync->len = READ_ONCE(sqe->len);
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sync->flags = READ_ONCE(sqe->sync_range_flags);
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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_sync_file_range(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
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int ret;
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/* sync_file_range always requires a blocking context */
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = sync_file_range(req->file, sync->off, sync->len, sync->flags);
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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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int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
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if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in))
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return -EINVAL;
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sync->flags = READ_ONCE(sqe->fsync_flags);
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if (unlikely(sync->flags & ~IORING_FSYNC_DATASYNC))
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return -EINVAL;
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sync->off = READ_ONCE(sqe->off);
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sync->len = READ_ONCE(sqe->len);
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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_fsync(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
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loff_t end = sync->off + sync->len;
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int ret;
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/* fsync always requires a blocking context */
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = vfs_fsync_range(req->file, sync->off, end > 0 ? end : LLONG_MAX,
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sync->flags & IORING_FSYNC_DATASYNC);
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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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int io_fallocate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
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if (sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
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return -EINVAL;
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sync->off = READ_ONCE(sqe->off);
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sync->len = READ_ONCE(sqe->addr);
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sync->mode = READ_ONCE(sqe->len);
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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_fallocate(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
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int ret;
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/* fallocate always requiring blocking context */
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = vfs_fallocate(req->file, sync->mode, sync->off, sync->len);
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if (ret >= 0)
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fsnotify_modify(req->file);
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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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