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 17 struct io_fadvise { 18 struct file *file; 19 u64 offset; 20 u32 len; 21 u32 advice; 22 }; 23 24 struct io_madvise { 25 struct file *file; 26 u64 addr; 27 u32 len; 28 u32 advice; 29 }; 30 31 int 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 49 int 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 65 static 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 77 int 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 92 int 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