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 }; 44 45 struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type); 46 void io_free_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node); 47 void io_rsrc_data_free(struct io_ring_ctx *ctx, struct io_rsrc_data *data); 48 int io_rsrc_data_alloc(struct io_rsrc_data *data, unsigned nr); 49 50 int io_import_fixed(int ddir, struct iov_iter *iter, 51 struct io_mapped_ubuf *imu, 52 u64 buf_addr, size_t len); 53 54 int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg); 55 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); 56 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, 57 unsigned int nr_args, u64 __user *tags); 58 int io_sqe_files_unregister(struct io_ring_ctx *ctx); 59 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, 60 unsigned nr_args, u64 __user *tags); 61 62 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, 63 unsigned nr_args); 64 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, 65 unsigned size, unsigned type); 66 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, 67 unsigned int size, unsigned int type); 68 69 static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data, 70 int index) 71 { 72 if (index < data->nr) 73 return data->nodes[array_index_nospec(index, data->nr)]; 74 return NULL; 75 } 76 77 static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node) 78 { 79 if (node && !--node->refs) 80 io_free_rsrc_node(ctx, node); 81 } 82 83 static inline bool io_reset_rsrc_node(struct io_ring_ctx *ctx, 84 struct io_rsrc_data *data, int index) 85 { 86 struct io_rsrc_node *node = data->nodes[index]; 87 88 if (!node) 89 return false; 90 io_put_rsrc_node(ctx, node); 91 data->nodes[index] = NULL; 92 return true; 93 } 94 95 static inline void io_req_put_rsrc_nodes(struct io_kiocb *req) 96 { 97 if (req->file_node) { 98 io_put_rsrc_node(req->ctx, req->file_node); 99 req->file_node = NULL; 100 } 101 if (req->flags & REQ_F_BUF_NODE) { 102 io_put_rsrc_node(req->ctx, req->buf_node); 103 req->buf_node = NULL; 104 } 105 } 106 107 static inline void io_req_assign_rsrc_node(struct io_rsrc_node **dst_node, 108 struct io_rsrc_node *node) 109 { 110 node->refs++; 111 *dst_node = node; 112 } 113 114 static inline void io_req_assign_buf_node(struct io_kiocb *req, 115 struct io_rsrc_node *node) 116 { 117 io_req_assign_rsrc_node(&req->buf_node, node); 118 req->flags |= REQ_F_BUF_NODE; 119 } 120 121 int io_files_update(struct io_kiocb *req, unsigned int issue_flags); 122 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); 123 124 int __io_account_mem(struct user_struct *user, unsigned long nr_pages); 125 126 static inline void __io_unaccount_mem(struct user_struct *user, 127 unsigned long nr_pages) 128 { 129 atomic_long_sub(nr_pages, &user->locked_vm); 130 } 131 132 #endif 133