1 // SPDX-License-Identifier: GPL-2.0
5 #include <net/af_unix.h>
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)
13 IORING_RSRC_BUFFER = 1,
17 struct list_head list;
22 struct io_mapped_ubuf *buf;
26 typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
29 struct io_ring_ctx *ctx;
35 struct completion done;
41 struct list_head node;
42 struct list_head rsrc_list;
43 struct io_rsrc_data *rsrc_data;
44 struct llist_node llist;
49 struct io_mapped_ubuf {
52 unsigned int nr_bvecs;
53 unsigned long acct_pages;
54 struct bio_vec bvec[];
57 void io_rsrc_put_tw(struct callback_head *cb);
58 void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
59 void io_rsrc_put_work(struct work_struct *work);
60 void io_rsrc_refs_refill(struct io_ring_ctx *ctx, struct io_rsrc_node *node);
61 void io_wait_rsrc_data(struct io_rsrc_data *data);
62 void io_rsrc_node_destroy(struct io_rsrc_node *ref_node);
63 void io_rsrc_refs_drop(struct io_ring_ctx *ctx);
64 int io_rsrc_node_switch_start(struct io_ring_ctx *ctx);
65 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
66 struct io_rsrc_node *node, void *rsrc);
67 void io_rsrc_node_switch(struct io_ring_ctx *ctx,
68 struct io_rsrc_data *data_to_kill);
70 int io_import_fixed(int ddir, struct iov_iter *iter,
71 struct io_mapped_ubuf *imu,
72 u64 buf_addr, size_t len);
74 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
75 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
76 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
77 unsigned int nr_args, u64 __user *tags);
78 void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
79 int io_sqe_files_unregister(struct io_ring_ctx *ctx);
80 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
81 unsigned nr_args, u64 __user *tags);
83 int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
85 #if defined(CONFIG_UNIX)
86 static inline bool io_file_need_scm(struct file *filp)
88 return !!unix_get_socket(filp);
91 static inline bool io_file_need_scm(struct file *filp)
97 static inline int io_scm_file_account(struct io_ring_ctx *ctx,
100 if (likely(!io_file_need_scm(file)))
102 return __io_scm_file_account(ctx, file);
105 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
107 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
108 unsigned size, unsigned type);
109 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
110 unsigned int size, unsigned int type);
112 static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr)
114 if (refcount_sub_and_test(nr, &node->refs))
115 io_rsrc_node_ref_zero(node);
118 static inline void io_put_rsrc_node(struct io_rsrc_node *node)
121 io_rsrc_put_node(node, 1);
124 static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
125 struct io_ring_ctx *ctx)
126 __must_hold(&ctx->uring_lock)
128 struct io_rsrc_node *node = req->rsrc_node;
131 if (node == ctx->rsrc_node)
134 io_rsrc_put_node(node, 1);
138 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
139 struct io_rsrc_node *node)
142 if (unlikely(node->cached_refs < 0))
143 io_rsrc_refs_refill(ctx, node);
146 static inline void io_req_set_rsrc_node(struct io_kiocb *req,
147 struct io_ring_ctx *ctx,
148 unsigned int issue_flags)
150 if (!req->rsrc_node) {
151 io_ring_submit_lock(ctx, issue_flags);
153 lockdep_assert_held(&ctx->uring_lock);
155 req->rsrc_node = ctx->rsrc_node;
156 io_charge_rsrc_node(ctx, ctx->rsrc_node);
157 io_ring_submit_unlock(ctx, issue_flags);
161 static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
163 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
164 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
166 return &data->tags[table_idx][off];
169 int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
170 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
172 int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
174 static inline void __io_unaccount_mem(struct user_struct *user,
175 unsigned long nr_pages)
177 atomic_long_sub(nr_pages, &user->locked_vm);