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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_work(struct work_struct *work);
57void io_rsrc_refs_refill(struct io_ring_ctx *ctx);
58void io_wait_rsrc_data(struct io_rsrc_data *data);
59void io_rsrc_node_destroy(struct io_rsrc_node *ref_node);
60void io_rsrc_refs_drop(struct io_ring_ctx *ctx);
61int io_rsrc_node_switch_start(struct io_ring_ctx *ctx);
62int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
63 struct io_rsrc_node *node, void *rsrc);
64void io_rsrc_node_switch(struct io_ring_ctx *ctx,
65 struct io_rsrc_data *data_to_kill);
66
67int io_import_fixed(int ddir, struct iov_iter *iter,
68 struct io_mapped_ubuf *imu,
69 u64 buf_addr, size_t len);
70
71void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
72int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
73int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
74 unsigned int nr_args, u64 __user *tags);
75void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
76int io_sqe_files_unregister(struct io_ring_ctx *ctx);
77int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
78 unsigned nr_args, u64 __user *tags);
79
80int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
81
82#if defined(CONFIG_UNIX)
83static inline bool io_file_need_scm(struct file *filp)
84{
85#if defined(IO_URING_SCM_ALL)
86 return true;
87#else
88 return !!unix_get_socket(filp);
89#endif
90}
91#else
92static inline bool io_file_need_scm(struct file *filp)
93{
94 return false;
95}
96#endif
97
98static inline int io_scm_file_account(struct io_ring_ctx *ctx,
99 struct file *file)
100{
101 if (likely(!io_file_need_scm(file)))
102 return 0;
103 return __io_scm_file_account(ctx, file);
104}
105
106int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
107 unsigned nr_args);
108int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
109 unsigned size, unsigned type);
110int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
111 unsigned int size, unsigned int type);
112
113static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr)
114{
115 percpu_ref_put_many(&node->refs, nr);
116}
117
118static inline void io_req_put_rsrc(struct io_kiocb *req)
119{
120 if (req->rsrc_node)
121 io_rsrc_put_node(req->rsrc_node, 1);
122}
123
124static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
125 struct io_ring_ctx *ctx)
126 __must_hold(&ctx->uring_lock)
127{
128 struct io_rsrc_node *node = req->rsrc_node;
129
130 if (node) {
131 if (node == ctx->rsrc_node)
132 ctx->rsrc_cached_refs++;
133 else
134 io_rsrc_put_node(node, 1);
135 }
136}
137
138static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx)
139{
140 ctx->rsrc_cached_refs--;
141 if (unlikely(ctx->rsrc_cached_refs < 0))
142 io_rsrc_refs_refill(ctx);
143}
144
145static inline void io_req_set_rsrc_node(struct io_kiocb *req,
146 struct io_ring_ctx *ctx,
147 unsigned int issue_flags)
148{
149 if (!req->rsrc_node) {
150 req->rsrc_node = ctx->rsrc_node;
151
152 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
153 lockdep_assert_held(&ctx->uring_lock);
154
155 io_charge_rsrc_node(ctx);
156 } else {
157 percpu_ref_get(&req->rsrc_node->refs);
158 }
159 }
160}
161
162static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
163{
164 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
165 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
166
167 return &data->tags[table_idx][off];
168}
169
170int io_rsrc_update(struct io_kiocb *req, unsigned int issue_flags);
171int io_rsrc_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
172
173int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
174
175static inline void __io_unaccount_mem(struct user_struct *user,
176 unsigned long nr_pages)
177{
178 atomic_long_sub(nr_pages, &user->locked_vm);
179}
180
181#endif