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Linux kernel mirror (for testing)
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linux
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
11enum {
12 IORING_RSRC_FILE = 0,
13 IORING_RSRC_BUFFER = 1,
14};
15
16struct 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
26typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
27
28struct 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
39struct 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
48struct 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
56void io_rsrc_put_tw(struct callback_head *cb);
57void io_rsrc_put_work(struct work_struct *work);
58void io_rsrc_refs_refill(struct io_ring_ctx *ctx);
59void io_wait_rsrc_data(struct io_rsrc_data *data);
60void io_rsrc_node_destroy(struct io_rsrc_node *ref_node);
61void io_rsrc_refs_drop(struct io_ring_ctx *ctx);
62int io_rsrc_node_switch_start(struct io_ring_ctx *ctx);
63int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
64 struct io_rsrc_node *node, void *rsrc);
65void io_rsrc_node_switch(struct io_ring_ctx *ctx,
66 struct io_rsrc_data *data_to_kill);
67
68int io_import_fixed(int ddir, struct iov_iter *iter,
69 struct io_mapped_ubuf *imu,
70 u64 buf_addr, size_t len);
71
72void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
73int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
74int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
75 unsigned int nr_args, u64 __user *tags);
76void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
77int io_sqe_files_unregister(struct io_ring_ctx *ctx);
78int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
79 unsigned nr_args, u64 __user *tags);
80
81int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
82
83#if defined(CONFIG_UNIX)
84static inline bool io_file_need_scm(struct file *filp)
85{
86 return !!unix_get_socket(filp);
87}
88#else
89static inline bool io_file_need_scm(struct file *filp)
90{
91 return false;
92}
93#endif
94
95static 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
103int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
104 unsigned nr_args);
105int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
106 unsigned size, unsigned type);
107int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
108 unsigned int size, unsigned int type);
109
110static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr)
111{
112 percpu_ref_put_many(&node->refs, nr);
113}
114
115static 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
121static 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
135static 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
142static 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
159static 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
167int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
168int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
169
170int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
171
172static 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