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); 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 return 0; 43 #else 44 return -EOPNOTSUPP; 45 #endif 46 } 47 48 int io_madvise(struct io_kiocb *req, unsigned int issue_flags) 49 { 50 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) 51 struct io_madvise *ma = io_kiocb_to_cmd(req); 52 int ret; 53 54 if (issue_flags & IO_URING_F_NONBLOCK) 55 return -EAGAIN; 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 int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 66 { 67 struct io_fadvise *fa = io_kiocb_to_cmd(req); 68 69 if (sqe->buf_index || sqe->addr || sqe->splice_fd_in) 70 return -EINVAL; 71 72 fa->offset = READ_ONCE(sqe->off); 73 fa->len = READ_ONCE(sqe->len); 74 fa->advice = READ_ONCE(sqe->fadvise_advice); 75 return 0; 76 } 77 78 int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) 79 { 80 struct io_fadvise *fa = io_kiocb_to_cmd(req); 81 int ret; 82 83 if (issue_flags & IO_URING_F_NONBLOCK) { 84 switch (fa->advice) { 85 case POSIX_FADV_NORMAL: 86 case POSIX_FADV_RANDOM: 87 case POSIX_FADV_SEQUENTIAL: 88 break; 89 default: 90 return -EAGAIN; 91 } 92 } 93 94 ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); 95 if (ret < 0) 96 req_set_fail(req); 97 io_req_set_res(req, ret, 0); 98 return IOU_OK; 99 } 100