1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 2 #include <linux/kernel.h> 3 #include <linux/errno.h> 3 #include <linux/errno.h> 4 #include <linux/fs.h> 4 #include <linux/fs.h> 5 #include <linux/file.h> 5 #include <linux/file.h> 6 #include <linux/mm.h> 6 #include <linux/mm.h> 7 #include <linux/slab.h> 7 #include <linux/slab.h> 8 #include <linux/namei.h> 8 #include <linux/namei.h> 9 #include <linux/io_uring.h> 9 #include <linux/io_uring.h> 10 10 11 #include <uapi/linux/fadvise.h> 11 #include <uapi/linux/fadvise.h> 12 #include <uapi/linux/io_uring.h> 12 #include <uapi/linux/io_uring.h> 13 13 14 #include "io_uring.h" 14 #include "io_uring.h" 15 #include "advise.h" 15 #include "advise.h" 16 16 17 struct io_fadvise { 17 struct io_fadvise { 18 struct file *file; 18 struct file *file; 19 u64 offset 19 u64 offset; 20 u64 len; !! 20 u32 len; 21 u32 advice 21 u32 advice; 22 }; 22 }; 23 23 24 struct io_madvise { 24 struct io_madvise { 25 struct file *file; 25 struct file *file; 26 u64 addr; 26 u64 addr; 27 u64 len; !! 27 u32 len; 28 u32 advice 28 u32 advice; 29 }; 29 }; 30 30 31 int io_madvise_prep(struct io_kiocb *req, cons 31 int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 32 { 32 { 33 #if defined(CONFIG_ADVISE_SYSCALLS) && defined 33 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) 34 struct io_madvise *ma = io_kiocb_to_cm 34 struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise); 35 35 36 if (sqe->buf_index || sqe->splice_fd_i !! 36 if (sqe->buf_index || sqe->off || sqe->splice_fd_in) 37 return -EINVAL; 37 return -EINVAL; 38 38 39 ma->addr = READ_ONCE(sqe->addr); 39 ma->addr = READ_ONCE(sqe->addr); 40 ma->len = READ_ONCE(sqe->off); !! 40 ma->len = READ_ONCE(sqe->len); 41 if (!ma->len) << 42 ma->len = READ_ONCE(sqe->len); << 43 ma->advice = READ_ONCE(sqe->fadvise_ad 41 ma->advice = READ_ONCE(sqe->fadvise_advice); 44 req->flags |= REQ_F_FORCE_ASYNC; << 45 return 0; 42 return 0; 46 #else 43 #else 47 return -EOPNOTSUPP; 44 return -EOPNOTSUPP; 48 #endif 45 #endif 49 } 46 } 50 47 51 int io_madvise(struct io_kiocb *req, unsigned 48 int io_madvise(struct io_kiocb *req, unsigned int issue_flags) 52 { 49 { 53 #if defined(CONFIG_ADVISE_SYSCALLS) && defined 50 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) 54 struct io_madvise *ma = io_kiocb_to_cm 51 struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise); 55 int ret; 52 int ret; 56 53 57 WARN_ON_ONCE(issue_flags & IO_URING_F_ !! 54 if (issue_flags & IO_URING_F_NONBLOCK) >> 55 return -EAGAIN; 58 56 59 ret = do_madvise(current->mm, ma->addr 57 ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); 60 io_req_set_res(req, ret, 0); 58 io_req_set_res(req, ret, 0); 61 return IOU_OK; 59 return IOU_OK; 62 #else 60 #else 63 return -EOPNOTSUPP; 61 return -EOPNOTSUPP; 64 #endif 62 #endif 65 } 63 } 66 64 67 static bool io_fadvise_force_async(struct io_f << 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 << 79 int io_fadvise_prep(struct io_kiocb *req, cons 65 int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 80 { 66 { 81 struct io_fadvise *fa = io_kiocb_to_cm 67 struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise); 82 68 83 if (sqe->buf_index || sqe->splice_fd_i !! 69 if (sqe->buf_index || sqe->addr || sqe->splice_fd_in) 84 return -EINVAL; 70 return -EINVAL; 85 71 86 fa->offset = READ_ONCE(sqe->off); 72 fa->offset = READ_ONCE(sqe->off); 87 fa->len = READ_ONCE(sqe->addr); !! 73 fa->len = READ_ONCE(sqe->len); 88 if (!fa->len) << 89 fa->len = READ_ONCE(sqe->len); << 90 fa->advice = READ_ONCE(sqe->fadvise_ad 74 fa->advice = READ_ONCE(sqe->fadvise_advice); 91 if (io_fadvise_force_async(fa)) << 92 req->flags |= REQ_F_FORCE_ASYN << 93 return 0; 75 return 0; 94 } 76 } 95 77 96 int io_fadvise(struct io_kiocb *req, unsigned 78 int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) 97 { 79 { 98 struct io_fadvise *fa = io_kiocb_to_cm 80 struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise); 99 int ret; 81 int ret; 100 82 101 WARN_ON_ONCE(issue_flags & IO_URING_F_ !! 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 } 102 93 103 ret = vfs_fadvise(req->file, fa->offse 94 ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); 104 if (ret < 0) 95 if (ret < 0) 105 req_set_fail(req); 96 req_set_fail(req); 106 io_req_set_res(req, ret, 0); 97 io_req_set_res(req, ret, 0); 107 return IOU_OK; 98 return IOU_OK; 108 } 99 } 109 100
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