1 // SPDX-License-Identifier: GPL-2.0 2 #ifndef IOU_RSRC_H 3 #define IOU_RSRC_H 4 5 #include <net/af_unix.h> 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_put { 17 struct list_head list; 18 u64 tag; 19 union { 20 void *rsrc; 21 struct file *file; 22 struct io_mapped_ubuf *buf; 23 }; 24 }; 25 26 typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); 27 28 struct io_rsrc_data { 29 struct io_ring_ctx *ctx; 30 31 u64 **tags; 32 unsigned int nr; 33 rsrc_put_fn *do_put; 34 atomic_t refs; 35 struct completion done; 36 bool quiesce; 37 }; 38 39 struct io_rsrc_node { 40 struct percpu_ref refs; 41 struct list_head node; 42 struct list_head rsrc_list; 43 struct io_rsrc_data *rsrc_data; 44 struct llist_node llist; 45 bool done; 46 }; 47 48 struct io_mapped_ubuf { 49 u64 ubuf; 50 u64 ubuf_end; 51 unsigned int nr_bvecs; 52 unsigned long acct_pages; 53 struct bio_vec bvec[]; 54 }; 55 56 void io_rsrc_put_work(struct work_struct *work); 57 void io_rsrc_refs_refill(struct io_ring_ctx *ctx); 58 void io_wait_rsrc_data(struct io_rsrc_data *data); 59 void io_rsrc_node_destroy(struct io_rsrc_node *ref_node); 60 void io_rsrc_refs_drop(struct io_ring_ctx *ctx); 61 int io_rsrc_node_switch_start(struct io_ring_ctx *ctx); 62 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, 63 struct io_rsrc_node *node, void *rsrc); 64 void io_rsrc_node_switch(struct io_ring_ctx *ctx, 65 struct io_rsrc_data *data_to_kill); 66 67 int io_import_fixed(int ddir, struct iov_iter *iter, 68 struct io_mapped_ubuf *imu, 69 u64 buf_addr, size_t len); 70 71 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); 72 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); 73 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, 74 unsigned int nr_args, u64 __user *tags); 75 void __io_sqe_files_unregister(struct io_ring_ctx *ctx); 76 int io_sqe_files_unregister(struct io_ring_ctx *ctx); 77 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, 78 unsigned nr_args, u64 __user *tags); 79 80 int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file); 81 82 #if defined(CONFIG_UNIX) 83 static inline bool io_file_need_scm(struct file *filp) 84 { 85 return !!unix_get_socket(filp); 86 } 87 #else 88 static inline bool io_file_need_scm(struct file *filp) 89 { 90 return false; 91 } 92 #endif 93 94 static inline int io_scm_file_account(struct io_ring_ctx *ctx, 95 struct file *file) 96 { 97 if (likely(!io_file_need_scm(file))) 98 return 0; 99 return __io_scm_file_account(ctx, file); 100 } 101 102 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, 103 unsigned nr_args); 104 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, 105 unsigned size, unsigned type); 106 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, 107 unsigned int size, unsigned int type); 108 109 static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr) 110 { 111 percpu_ref_put_many(&node->refs, nr); 112 } 113 114 static inline void io_req_put_rsrc(struct io_kiocb *req) 115 { 116 if (req->rsrc_node) 117 io_rsrc_put_node(req->rsrc_node, 1); 118 } 119 120 static inline void io_req_put_rsrc_locked(struct io_kiocb *req, 121 struct io_ring_ctx *ctx) 122 __must_hold(&ctx->uring_lock) 123 { 124 struct io_rsrc_node *node = req->rsrc_node; 125 126 if (node) { 127 if (node == ctx->rsrc_node) 128 ctx->rsrc_cached_refs++; 129 else 130 io_rsrc_put_node(node, 1); 131 } 132 } 133 134 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx) 135 { 136 ctx->rsrc_cached_refs--; 137 if (unlikely(ctx->rsrc_cached_refs < 0)) 138 io_rsrc_refs_refill(ctx); 139 } 140 141 static inline void io_req_set_rsrc_node(struct io_kiocb *req, 142 struct io_ring_ctx *ctx, 143 unsigned int issue_flags) 144 { 145 if (!req->rsrc_node) { 146 req->rsrc_node = ctx->rsrc_node; 147 148 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 149 lockdep_assert_held(&ctx->uring_lock); 150 151 io_charge_rsrc_node(ctx); 152 } else { 153 percpu_ref_get(&req->rsrc_node->refs); 154 } 155 } 156 } 157 158 static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) 159 { 160 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; 161 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; 162 163 return &data->tags[table_idx][off]; 164 } 165 166 int io_files_update(struct io_kiocb *req, unsigned int issue_flags); 167 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); 168 169 int __io_account_mem(struct user_struct *user, unsigned long nr_pages); 170 171 static inline void __io_unaccount_mem(struct user_struct *user, 172 unsigned long nr_pages) 173 { 174 atomic_long_sub(nr_pages, &user->locked_vm); 175 } 176 177 #endif 178