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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#define IO_NODE_ALLOC_CACHE_MAX 32
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 u64 tag;
18 union {
19 void *rsrc;
20 struct file *file;
21 struct io_mapped_ubuf *buf;
22 };
23};
24
25typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
26
27struct io_rsrc_data {
28 struct io_ring_ctx *ctx;
29
30 u64 **tags;
31 unsigned int nr;
32 u16 rsrc_type;
33 bool quiesce;
34};
35
36struct io_rsrc_node {
37 struct io_ring_ctx *ctx;
38 int refs;
39 bool empty;
40 u16 type;
41 struct list_head node;
42 struct io_rsrc_put item;
43};
44
45struct io_mapped_ubuf {
46 u64 ubuf;
47 u64 ubuf_end;
48 unsigned int nr_bvecs;
49 unsigned long acct_pages;
50 struct bio_vec bvec[] __counted_by(nr_bvecs);
51};
52
53void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
54void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
55struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
56int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
57
58int io_import_fixed(int ddir, struct iov_iter *iter,
59 struct io_mapped_ubuf *imu,
60 u64 buf_addr, size_t len);
61
62void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
63int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
64int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
65 unsigned int nr_args, u64 __user *tags);
66void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
67int io_sqe_files_unregister(struct io_ring_ctx *ctx);
68int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
69 unsigned nr_args, u64 __user *tags);
70
71int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
72 unsigned nr_args);
73int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
74 unsigned size, unsigned type);
75int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
76 unsigned int size, unsigned int type);
77
78static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
79{
80 lockdep_assert_held(&ctx->uring_lock);
81
82 if (node && !--node->refs)
83 io_rsrc_node_ref_zero(node);
84}
85
86static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
87 struct io_rsrc_node *node)
88{
89 node->refs++;
90}
91
92static inline void __io_req_set_rsrc_node(struct io_kiocb *req,
93 struct io_ring_ctx *ctx)
94{
95 lockdep_assert_held(&ctx->uring_lock);
96 req->rsrc_node = ctx->rsrc_node;
97 io_charge_rsrc_node(ctx, ctx->rsrc_node);
98}
99
100static inline void io_req_set_rsrc_node(struct io_kiocb *req,
101 struct io_ring_ctx *ctx,
102 unsigned int issue_flags)
103{
104 if (!req->rsrc_node) {
105 io_ring_submit_lock(ctx, issue_flags);
106 __io_req_set_rsrc_node(req, ctx);
107 io_ring_submit_unlock(ctx, issue_flags);
108 }
109}
110
111static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
112{
113 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
114 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
115
116 return &data->tags[table_idx][off];
117}
118
119static inline int io_rsrc_init(struct io_ring_ctx *ctx)
120{
121 ctx->rsrc_node = io_rsrc_node_alloc(ctx);
122 return ctx->rsrc_node ? 0 : -ENOMEM;
123}
124
125int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
126int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
127
128int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
129
130static inline void __io_unaccount_mem(struct user_struct *user,
131 unsigned long nr_pages)
132{
133 atomic_long_sub(nr_pages, &user->locked_vm);
134}
135
136#endif