109 lines · c
1// SPDX-License-Identifier: GPL-2.02#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 u64 len;21 u32 advice;22};23 24struct io_madvise {25 struct file *file;26 u64 addr;27 u64 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->splice_fd_in)37 return -EINVAL;38 39 ma->addr = READ_ONCE(sqe->addr);40 ma->len = READ_ONCE(sqe->off);41 if (!ma->len)42 ma->len = READ_ONCE(sqe->len);43 ma->advice = READ_ONCE(sqe->fadvise_advice);44 req->flags |= REQ_F_FORCE_ASYNC;45 return 0;46#else47 return -EOPNOTSUPP;48#endif49}50 51int io_madvise(struct io_kiocb *req, unsigned int issue_flags)52{53#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)54 struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);55 int ret;56 57 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);58 59 ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);60 io_req_set_res(req, ret, 0);61 return IOU_OK;62#else63 return -EOPNOTSUPP;64#endif65}66 67static bool io_fadvise_force_async(struct io_fadvise *fa)68{69 switch (fa->advice) {70 case POSIX_FADV_NORMAL:71 case POSIX_FADV_RANDOM:72 case POSIX_FADV_SEQUENTIAL:73 return false;74 default:75 return true;76 }77}78 79int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)80{81 struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);82 83 if (sqe->buf_index || sqe->splice_fd_in)84 return -EINVAL;85 86 fa->offset = READ_ONCE(sqe->off);87 fa->len = READ_ONCE(sqe->addr);88 if (!fa->len)89 fa->len = READ_ONCE(sqe->len);90 fa->advice = READ_ONCE(sqe->fadvise_advice);91 if (io_fadvise_force_async(fa))92 req->flags |= REQ_F_FORCE_ASYNC;93 return 0;94}95 96int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)97{98 struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);99 int ret;100 101 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa));102 103 ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);104 if (ret < 0)105 req_set_fail(req);106 io_req_set_res(req, ret, 0);107 return IOU_OK;108}109