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} 105