1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/kernel.h>
  3#include <linux/errno.h>
  4#include <linux/fs.h>
  5#include <linux/file.h>
  6#include <linux/mm.h>
  7#include <linux/slab.h>
  8#include <linux/namei.h>
  9#include <linux/io_uring.h>
 10
 11#include <uapi/linux/fadvise.h>
 12#include <uapi/linux/io_uring.h>
 13
 14#include "io_uring.h"
 15#include "advise.h"
 16
 17struct io_fadvise {
 18	struct file			*file;
 19	u64				offset;
 20	u32				len;
 21	u32				advice;
 22};
 23
 24struct io_madvise {
 25	struct file			*file;
 26	u64				addr;
 27	u32				len;
 28	u32				advice;
 29};
 30
 31int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 32{
 33#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
 34	struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
 35
 36	if (sqe->buf_index || sqe->off || sqe->splice_fd_in)
 37		return -EINVAL;
 38
 39	ma->addr = READ_ONCE(sqe->addr);
 40	ma->len = READ_ONCE(sqe->len);
 41	ma->advice = READ_ONCE(sqe->fadvise_advice);
 42	req->flags |= REQ_F_FORCE_ASYNC;
 43	return 0;
 44#else
 45	return -EOPNOTSUPP;
 46#endif
 47}
 48
 49int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
 50{
 51#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
 52	struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
 53	int ret;
 54
 55	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
 56
 57	ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
 58	io_req_set_res(req, ret, 0);
 59	return IOU_OK;
 60#else
 61	return -EOPNOTSUPP;
 62#endif
 63}
 64
 65static bool io_fadvise_force_async(struct io_fadvise *fa)
 66{
 67	switch (fa->advice) {
 68	case POSIX_FADV_NORMAL:
 69	case POSIX_FADV_RANDOM:
 70	case POSIX_FADV_SEQUENTIAL:
 71		return false;
 72	default:
 73		return true;
 74	}
 75}
 76
 77int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 78{
 79	struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
 80
 81	if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
 82		return -EINVAL;
 83
 84	fa->offset = READ_ONCE(sqe->off);
 85	fa->len = READ_ONCE(sqe->len);
 86	fa->advice = READ_ONCE(sqe->fadvise_advice);
 87	if (io_fadvise_force_async(fa))
 88		req->flags |= REQ_F_FORCE_ASYNC;
 89	return 0;
 90}
 91
 92int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
 93{
 94	struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
 95	int ret;
 96
 97	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa));
 98
 99	ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
100	if (ret < 0)
101		req_set_fail(req);
102	io_req_set_res(req, ret, 0);
103	return IOU_OK;
104}