1 // SPDX-License-Identifier: GPL-2.0 2 #ifndef IOU_RSRC_H 3 #define IOU_RSRC_H 4 5 #define IO_NODE_ALLOC_CACHE_MAX 32 6 7 #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) 8 #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) 9 #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) 10 11 enum { 12 IORING_RSRC_FILE = 0, 13 IORING_RSRC_BUFFER = 1, 14 }; 15 16 struct io_rsrc_node { 17 unsigned char type; 18 int refs; 19 20 u64 tag; 21 union { 22 unsigned long file_ptr; 23 struct io_mapped_ubuf *buf; 24 }; 25 }; 26 27 struct io_mapped_ubuf { 28 u64 ubuf; 29 unsigned int len; 30 unsigned int nr_bvecs; 31 unsigned int folio_shift; 32 refcount_t refs; 33 unsigned long acct_pages; 34 struct bio_vec bvec[] __counted_by(nr_bvecs); 35 }; 36 37 struct io_imu_folio_data { 38 /* Head folio can be partially included in the fixed buf */ 39 unsigned int nr_pages_head; 40 /* For non-head/tail folios, has to be fully included */ 41 unsigned int nr_pages_mid; 42 unsigned int folio_shift; 43 unsigned int nr_folios; 44 }; 45 46 struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type); 47 void io_free_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node); 48 void io_rsrc_data_free(struct io_ring_ctx *ctx, struct io_rsrc_data *data); 49 int io_rsrc_data_alloc(struct io_rsrc_data *data, unsigned nr); 50 51 int io_import_fixed(int ddir, struct iov_iter *iter, 52 struct io_mapped_ubuf *imu, 53 u64 buf_addr, size_t len); 54 55 int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg); 56 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); 57 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, 58 unsigned int nr_args, u64 __user *tags); 59 int io_sqe_files_unregister(struct io_ring_ctx *ctx); 60 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, 61 unsigned nr_args, u64 __user *tags); 62 63 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, 64 unsigned nr_args); 65 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, 66 unsigned size, unsigned type); 67 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, 68 unsigned int size, unsigned int type); 69 70 bool io_check_coalesce_buffer(struct page **page_array, int nr_pages, 71 struct io_imu_folio_data *data); 72 73 static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data, 74 int index) 75 { 76 if (index < data->nr) 77 return data->nodes[array_index_nospec(index, data->nr)]; 78 return NULL; 79 } 80 81 static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node) 82 { 83 if (node && !--node->refs) 84 io_free_rsrc_node(ctx, node); 85 } 86 87 static inline bool io_reset_rsrc_node(struct io_ring_ctx *ctx, 88 struct io_rsrc_data *data, int index) 89 { 90 struct io_rsrc_node *node = data->nodes[index]; 91 92 if (!node) 93 return false; 94 io_put_rsrc_node(ctx, node); 95 data->nodes[index] = NULL; 96 return true; 97 } 98 99 static inline void io_req_put_rsrc_nodes(struct io_kiocb *req) 100 { 101 if (req->file_node) { 102 io_put_rsrc_node(req->ctx, req->file_node); 103 req->file_node = NULL; 104 } 105 if (req->flags & REQ_F_BUF_NODE) { 106 io_put_rsrc_node(req->ctx, req->buf_node); 107 req->buf_node = NULL; 108 } 109 } 110 111 static inline void io_req_assign_rsrc_node(struct io_rsrc_node **dst_node, 112 struct io_rsrc_node *node) 113 { 114 node->refs++; 115 *dst_node = node; 116 } 117 118 static inline void io_req_assign_buf_node(struct io_kiocb *req, 119 struct io_rsrc_node *node) 120 { 121 io_req_assign_rsrc_node(&req->buf_node, node); 122 req->flags |= REQ_F_BUF_NODE; 123 } 124 125 int io_files_update(struct io_kiocb *req, unsigned int issue_flags); 126 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); 127 128 int __io_account_mem(struct user_struct *user, unsigned long nr_pages); 129 130 static inline void __io_unaccount_mem(struct user_struct *user, 131 unsigned long nr_pages) 132 { 133 atomic_long_sub(nr_pages, &user->locked_vm); 134 } 135 136 #endif 137