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f2ccb5aed7
We need to make sure (at build time) that struct io_cmd_data is not casted to a structure that's larger. Signed-off-by: Stefan Metzmacher <metze@samba.org> Link: https://lore.kernel.org/r/c024cdf25ae19fc0319d4180e2298bade8ed17b8.1660201408.git.metze@samba.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
100 lines
2.1 KiB
C
100 lines
2.1 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 <uapi/linux/fadvise.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "advise.h"
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struct io_fadvise {
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struct file *file;
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u64 offset;
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u32 len;
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u32 advice;
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};
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struct io_madvise {
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struct file *file;
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u64 addr;
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u32 len;
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u32 advice;
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};
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int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
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struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
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if (sqe->buf_index || sqe->off || sqe->splice_fd_in)
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return -EINVAL;
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ma->addr = READ_ONCE(sqe->addr);
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ma->len = READ_ONCE(sqe->len);
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ma->advice = READ_ONCE(sqe->fadvise_advice);
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return 0;
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#else
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return -EOPNOTSUPP;
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#endif
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}
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int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
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{
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#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
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struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
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int ret;
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if (issue_flags & IO_URING_F_NONBLOCK)
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return -EAGAIN;
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ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
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io_req_set_res(req, ret, 0);
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return IOU_OK;
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#else
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return -EOPNOTSUPP;
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#endif
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}
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int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
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if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
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return -EINVAL;
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fa->offset = READ_ONCE(sqe->off);
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fa->len = READ_ONCE(sqe->len);
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fa->advice = READ_ONCE(sqe->fadvise_advice);
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return 0;
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}
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int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
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int ret;
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if (issue_flags & IO_URING_F_NONBLOCK) {
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switch (fa->advice) {
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case POSIX_FADV_NORMAL:
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case POSIX_FADV_RANDOM:
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case POSIX_FADV_SEQUENTIAL:
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break;
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default:
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return -EAGAIN;
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}
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}
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ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
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if (ret < 0)
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req_set_fail(req);
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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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