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https://github.com/torvalds/linux
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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>
74 lines
1.6 KiB
C
74 lines
1.6 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/file.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 "statx.h"
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struct io_statx {
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struct file *file;
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int dfd;
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unsigned int mask;
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unsigned int flags;
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struct filename *filename;
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struct statx __user *buffer;
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};
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int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
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const char __user *path;
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if (sqe->buf_index || sqe->splice_fd_in)
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return -EINVAL;
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if (req->flags & REQ_F_FIXED_FILE)
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return -EBADF;
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sx->dfd = READ_ONCE(sqe->fd);
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sx->mask = READ_ONCE(sqe->len);
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path = u64_to_user_ptr(READ_ONCE(sqe->addr));
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sx->buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
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sx->flags = READ_ONCE(sqe->statx_flags);
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sx->filename = getname_flags(path,
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getname_statx_lookup_flags(sx->flags),
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NULL);
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if (IS_ERR(sx->filename)) {
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int ret = PTR_ERR(sx->filename);
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sx->filename = NULL;
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return ret;
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}
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req->flags |= REQ_F_NEED_CLEANUP;
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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_statx(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
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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_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer);
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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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void io_statx_cleanup(struct io_kiocb *req)
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{
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struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
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if (sx->filename)
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putname(sx->filename);
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}
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