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;
40 struct list_head node;
41 struct io_rsrc_data *rsrc_data;
42 struct llist_node llist;
47 * Keeps a list of struct io_rsrc_put to be completed. Each entry
48 * represents one rsrc (e.g. file or buffer), but all of them should've
49 * came from the same table and so are of the same type.
51 struct list_head item_list;
54 struct io_mapped_ubuf {
57 unsigned int nr_bvecs;
58 unsigned long acct_pages;
59 struct bio_vec bvec[];
62 void io_rsrc_put_tw(struct callback_head *cb);
63 void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
64 void io_rsrc_put_work(struct work_struct *work);
65 void io_wait_rsrc_data(struct io_rsrc_data *data);
66 void io_rsrc_node_destroy(struct io_rsrc_node *ref_node);
67 int io_rsrc_node_switch_start(struct io_ring_ctx *ctx);
68 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
69 struct io_rsrc_node *node, void *rsrc);
70 void io_rsrc_node_switch(struct io_ring_ctx *ctx,
71 struct io_rsrc_data *data_to_kill);
73 int io_import_fixed(int ddir, struct iov_iter *iter,
74 struct io_mapped_ubuf *imu,
75 u64 buf_addr, size_t len);
77 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
78 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
79 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
80 unsigned int nr_args, u64 __user *tags);
81 void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
82 int io_sqe_files_unregister(struct io_ring_ctx *ctx);
83 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
84 unsigned nr_args, u64 __user *tags);
86 int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
88 #if defined(CONFIG_UNIX)
89 static inline bool io_file_need_scm(struct file *filp)
91 return !!unix_get_socket(filp);
94 static inline bool io_file_need_scm(struct file *filp)
100 static inline int io_scm_file_account(struct io_ring_ctx *ctx,
103 if (likely(!io_file_need_scm(file)))
105 return __io_scm_file_account(ctx, file);
108 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
110 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
111 unsigned size, unsigned type);
112 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
113 unsigned int size, unsigned int type);
115 static inline void io_put_rsrc_node(struct io_rsrc_node *node)
117 if (node && !--node->refs)
118 io_rsrc_node_ref_zero(node);
121 static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
122 struct io_ring_ctx *ctx)
124 io_put_rsrc_node(req->rsrc_node);
127 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
128 struct io_rsrc_node *node)
133 static inline void io_req_set_rsrc_node(struct io_kiocb *req,
134 struct io_ring_ctx *ctx,
135 unsigned int issue_flags)
137 if (!req->rsrc_node) {
138 io_ring_submit_lock(ctx, issue_flags);
140 lockdep_assert_held(&ctx->uring_lock);
142 req->rsrc_node = ctx->rsrc_node;
143 io_charge_rsrc_node(ctx, ctx->rsrc_node);
144 io_ring_submit_unlock(ctx, issue_flags);
148 static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
150 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
151 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
153 return &data->tags[table_idx][off];
156 int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
157 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
159 int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
161 static inline void __io_unaccount_mem(struct user_struct *user,
162 unsigned long nr_pages)
164 atomic_long_sub(nr_pages, &user->locked_vm);