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Linux kernel mirror (for testing)
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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#include "alloc_cache.h"
8
9#define IO_NODE_ALLOC_CACHE_MAX 32
10
11#define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3)
12#define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT)
13#define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1)
14
15enum {
16 IORING_RSRC_FILE = 0,
17 IORING_RSRC_BUFFER = 1,
18};
19
20struct io_rsrc_put {
21 u64 tag;
22 union {
23 void *rsrc;
24 struct file *file;
25 struct io_mapped_ubuf *buf;
26 };
27};
28
29typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
30
31struct io_rsrc_data {
32 struct io_ring_ctx *ctx;
33
34 u64 **tags;
35 unsigned int nr;
36 u16 rsrc_type;
37 bool quiesce;
38};
39
40struct io_rsrc_node {
41 union {
42 struct io_cache_entry cache;
43 struct io_ring_ctx *ctx;
44 };
45 int refs;
46 bool empty;
47 u16 type;
48 struct list_head node;
49 struct io_rsrc_put item;
50};
51
52struct io_mapped_ubuf {
53 u64 ubuf;
54 u64 ubuf_end;
55 unsigned int nr_bvecs;
56 unsigned long acct_pages;
57 struct bio_vec bvec[];
58};
59
60void io_rsrc_put_tw(struct callback_head *cb);
61void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
62void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
63struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
64int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
65
66int io_import_fixed(int ddir, struct iov_iter *iter,
67 struct io_mapped_ubuf *imu,
68 u64 buf_addr, size_t len);
69
70void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
71int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
72int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
73 unsigned int nr_args, u64 __user *tags);
74void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
75int io_sqe_files_unregister(struct io_ring_ctx *ctx);
76int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
77 unsigned nr_args, u64 __user *tags);
78
79int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
80
81#if defined(CONFIG_UNIX)
82static inline bool io_file_need_scm(struct file *filp)
83{
84 return !!unix_get_socket(filp);
85}
86#else
87static inline bool io_file_need_scm(struct file *filp)
88{
89 return false;
90}
91#endif
92
93static inline int io_scm_file_account(struct io_ring_ctx *ctx,
94 struct file *file)
95{
96 if (likely(!io_file_need_scm(file)))
97 return 0;
98 return __io_scm_file_account(ctx, file);
99}
100
101int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
102 unsigned nr_args);
103int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
104 unsigned size, unsigned type);
105int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
106 unsigned int size, unsigned int type);
107
108static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
109{
110 lockdep_assert_held(&ctx->uring_lock);
111
112 if (node && !--node->refs)
113 io_rsrc_node_ref_zero(node);
114}
115
116static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
117 struct io_ring_ctx *ctx)
118{
119 io_put_rsrc_node(ctx, req->rsrc_node);
120}
121
122static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
123 struct io_rsrc_node *node)
124{
125 node->refs++;
126}
127
128static inline void io_req_set_rsrc_node(struct io_kiocb *req,
129 struct io_ring_ctx *ctx,
130 unsigned int issue_flags)
131{
132 if (!req->rsrc_node) {
133 io_ring_submit_lock(ctx, issue_flags);
134
135 lockdep_assert_held(&ctx->uring_lock);
136
137 req->rsrc_node = ctx->rsrc_node;
138 io_charge_rsrc_node(ctx, ctx->rsrc_node);
139 io_ring_submit_unlock(ctx, issue_flags);
140 }
141}
142
143static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
144{
145 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
146 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
147
148 return &data->tags[table_idx][off];
149}
150
151static inline int io_rsrc_init(struct io_ring_ctx *ctx)
152{
153 ctx->rsrc_node = io_rsrc_node_alloc(ctx);
154 return ctx->rsrc_node ? 0 : -ENOMEM;
155}
156
157int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
158int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
159
160int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
161
162static inline void __io_unaccount_mem(struct user_struct *user,
163 unsigned long nr_pages)
164{
165 atomic_long_sub(nr_pages, &user->locked_vm);
166}
167
168#endif