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 | |
15 | enum { |
16 | IORING_RSRC_FILE = 0, |
17 | IORING_RSRC_BUFFER = 1, |
18 | }; |
19 | |
20 | struct io_rsrc_put { |
21 | u64 tag; |
22 | union { |
23 | void *rsrc; |
24 | struct file *file; |
25 | struct io_mapped_ubuf *buf; |
26 | }; |
27 | }; |
28 | |
29 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
30 | |
31 | struct 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 | |
40 | struct 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 | |
52 | struct 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[] __counted_by(nr_bvecs); |
58 | }; |
59 | |
60 | void io_rsrc_node_ref_zero(struct io_rsrc_node *node); |
61 | void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node); |
62 | struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx); |
63 | int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc); |
64 | |
65 | int io_import_fixed(int ddir, struct iov_iter *iter, |
66 | struct io_mapped_ubuf *imu, |
67 | u64 buf_addr, size_t len); |
68 | |
69 | void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); |
70 | int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); |
71 | int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
72 | unsigned int nr_args, u64 __user *tags); |
73 | void __io_sqe_files_unregister(struct io_ring_ctx *ctx); |
74 | int io_sqe_files_unregister(struct io_ring_ctx *ctx); |
75 | int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
76 | unsigned nr_args, u64 __user *tags); |
77 | |
78 | int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file); |
79 | |
80 | #if defined(CONFIG_UNIX) |
81 | static inline bool io_file_need_scm(struct file *filp) |
82 | { |
83 | return !!unix_get_socket(filp); |
84 | } |
85 | #else |
86 | static inline bool io_file_need_scm(struct file *filp) |
87 | { |
88 | return false; |
89 | } |
90 | #endif |
91 | |
92 | static inline int io_scm_file_account(struct io_ring_ctx *ctx, |
93 | struct file *file) |
94 | { |
95 | if (likely(!io_file_need_scm(file))) |
96 | return 0; |
97 | return __io_scm_file_account(ctx, file); |
98 | } |
99 | |
100 | int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
101 | unsigned nr_args); |
102 | int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, |
103 | unsigned size, unsigned type); |
104 | int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
105 | unsigned int size, unsigned int type); |
106 | |
107 | static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node) |
108 | { |
109 | lockdep_assert_held(&ctx->uring_lock); |
110 | |
111 | if (node && !--node->refs) |
112 | io_rsrc_node_ref_zero(node); |
113 | } |
114 | |
115 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, |
116 | struct io_ring_ctx *ctx) |
117 | { |
118 | io_put_rsrc_node(ctx, node: req->rsrc_node); |
119 | } |
120 | |
121 | static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx, |
122 | struct io_rsrc_node *node) |
123 | { |
124 | node->refs++; |
125 | } |
126 | |
127 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
128 | struct io_ring_ctx *ctx, |
129 | unsigned int issue_flags) |
130 | { |
131 | if (!req->rsrc_node) { |
132 | io_ring_submit_lock(ctx, issue_flags); |
133 | |
134 | lockdep_assert_held(&ctx->uring_lock); |
135 | |
136 | req->rsrc_node = ctx->rsrc_node; |
137 | io_charge_rsrc_node(ctx, node: ctx->rsrc_node); |
138 | io_ring_submit_unlock(ctx, issue_flags); |
139 | } |
140 | } |
141 | |
142 | static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
143 | { |
144 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; |
145 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; |
146 | |
147 | return &data->tags[table_idx][off]; |
148 | } |
149 | |
150 | static inline int io_rsrc_init(struct io_ring_ctx *ctx) |
151 | { |
152 | ctx->rsrc_node = io_rsrc_node_alloc(ctx); |
153 | return ctx->rsrc_node ? 0 : -ENOMEM; |
154 | } |
155 | |
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); |
158 | |
159 | int __io_account_mem(struct user_struct *user, unsigned long nr_pages); |
160 | |
161 | static inline void __io_unaccount_mem(struct user_struct *user, |
162 | unsigned long nr_pages) |
163 | { |
164 | atomic_long_sub(i: nr_pages, v: &user->locked_vm); |
165 | } |
166 | |
167 | #endif |
168 | |