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_tw(struct callback_head *cb); 57 void io_rsrc_put_work(struct work_struct *work); 58 void io_rsrc_refs_refill(struct io_ring_ctx *ctx); 59 void io_wait_rsrc_data(struct io_rsrc_data *data); 60 void io_rsrc_node_destroy(struct io_rsrc_node *ref_node); 61 void io_rsrc_refs_drop(struct io_ring_ctx *ctx); 62 int io_rsrc_node_switch_start(struct io_ring_ctx *ctx); 63 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, 64 struct io_rsrc_node *node, void *rsrc); 65 void io_rsrc_node_switch(struct io_ring_ctx *ctx, 66 struct io_rsrc_data *data_to_kill); 67 68 int io_import_fixed(int ddir, struct iov_iter *iter, 69 struct io_mapped_ubuf *imu, 70 u64 buf_addr, size_t len); 71 72 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); 73 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); 74 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, 75 unsigned int nr_args, u64 __user *tags); 76 void __io_sqe_files_unregister(struct io_ring_ctx *ctx); 77 int io_sqe_files_unregister(struct io_ring_ctx *ctx); 78 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, 79 unsigned nr_args, u64 __user *tags); 80 81 int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file); 82 83 #if defined(CONFIG_UNIX) 84 static inline bool io_file_need_scm(struct file *filp) 85 { 86 return !!unix_get_socket(filp); 87 } 88 #else 89 static inline bool io_file_need_scm(struct file *filp) 90 { 91 return false; 92 } 93 #endif 94 95 static inline int io_scm_file_account(struct io_ring_ctx *ctx, 96 struct file *file) 97 { 98 if (likely(!io_file_need_scm(file))) 99 return 0; 100 return __io_scm_file_account(ctx, file); 101 } 102 103 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, 104 unsigned nr_args); 105 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, 106 unsigned size, unsigned type); 107 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, 108 unsigned int size, unsigned int type); 109 110 static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr) 111 { 112 percpu_ref_put_many(&node->refs, nr); 113 } 114 115 static inline void io_req_put_rsrc(struct io_kiocb *req) 116 { 117 if (req->rsrc_node) 118 io_rsrc_put_node(req->rsrc_node, 1); 119 } 120 121 static inline void io_req_put_rsrc_locked(struct io_kiocb *req, 122 struct io_ring_ctx *ctx) 123 __must_hold(&ctx->uring_lock) 124 { 125 struct io_rsrc_node *node = req->rsrc_node; 126 127 if (node) { 128 if (node == ctx->rsrc_node) 129 ctx->rsrc_cached_refs++; 130 else 131 io_rsrc_put_node(node, 1); 132 } 133 } 134 135 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx) 136 { 137 ctx->rsrc_cached_refs--; 138 if (unlikely(ctx->rsrc_cached_refs < 0)) 139 io_rsrc_refs_refill(ctx); 140 } 141 142 static inline void io_req_set_rsrc_node(struct io_kiocb *req, 143 struct io_ring_ctx *ctx, 144 unsigned int issue_flags) 145 { 146 if (!req->rsrc_node) { 147 req->rsrc_node = ctx->rsrc_node; 148 149 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 150 lockdep_assert_held(&ctx->uring_lock); 151 152 io_charge_rsrc_node(ctx); 153 } else { 154 percpu_ref_get(&req->rsrc_node->refs); 155 } 156 } 157 } 158 159 static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) 160 { 161 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; 162 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; 163 164 return &data->tags[table_idx][off]; 165 } 166 167 int io_files_update(struct io_kiocb *req, unsigned int issue_flags); 168 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); 169 170 int __io_account_mem(struct user_struct *user, unsigned long nr_pages); 171 172 static inline void __io_unaccount_mem(struct user_struct *user, 173 unsigned long nr_pages) 174 { 175 atomic_long_sub(nr_pages, &user->locked_vm); 176 } 177 178 #endif 179