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73572984 JA |
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 | ||
11 | enum { | |
12 | IORING_RSRC_FILE = 0, | |
13 | IORING_RSRC_BUFFER = 1, | |
14 | }; | |
15 | ||
16 | struct 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 | ||
26 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); | |
27 | ||
28 | struct 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 | ||
39 | struct 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 | ||
ad163a7e JA |
48 | struct 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 | ||
d34b1b0b | 56 | void io_rsrc_put_tw(struct callback_head *cb); |
73572984 JA |
57 | void io_rsrc_put_work(struct work_struct *work); |
58 | void io_rsrc_refs_refill(struct io_ring_ctx *ctx); | |
59 | void io_wait_rsrc_data(struct io_rsrc_data *data); | |
60 | void io_rsrc_node_destroy(struct io_rsrc_node *ref_node); | |
61 | void io_rsrc_refs_drop(struct io_ring_ctx *ctx); | |
62 | int io_rsrc_node_switch_start(struct io_ring_ctx *ctx); | |
63 | int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, | |
64 | struct io_rsrc_node *node, void *rsrc); | |
65 | void io_rsrc_node_switch(struct io_ring_ctx *ctx, | |
66 | struct io_rsrc_data *data_to_kill); | |
67 | ||
c059f785 PB |
68 | int io_import_fixed(int ddir, struct iov_iter *iter, |
69 | struct io_mapped_ubuf *imu, | |
70 | u64 buf_addr, size_t len); | |
73572984 JA |
71 | |
72 | void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); | |
73 | int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); | |
74 | int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, | |
75 | unsigned int nr_args, u64 __user *tags); | |
76 | void __io_sqe_files_unregister(struct io_ring_ctx *ctx); | |
77 | int io_sqe_files_unregister(struct io_ring_ctx *ctx); | |
78 | int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, | |
79 | unsigned nr_args, u64 __user *tags); | |
80 | ||
81 | int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file); | |
82 | ||
83 | #if defined(CONFIG_UNIX) | |
84 | static inline bool io_file_need_scm(struct file *filp) | |
85 | { | |
73572984 | 86 | return !!unix_get_socket(filp); |
73572984 JA |
87 | } |
88 | #else | |
89 | static inline bool io_file_need_scm(struct file *filp) | |
90 | { | |
91 | return false; | |
92 | } | |
93 | #endif | |
94 | ||
95 | static 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 | ||
103 | int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, | |
104 | unsigned nr_args); | |
105 | int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
106 | unsigned size, unsigned type); | |
107 | int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, | |
108 | unsigned int size, unsigned int type); | |
109 | ||
110 | static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr) | |
111 | { | |
112 | percpu_ref_put_many(&node->refs, nr); | |
113 | } | |
114 | ||
115 | static 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 | ||
121 | static 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 | ||
68ef5578 PB |
135 | static 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 | ||
73572984 JA |
142 | static 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) { | |
4ff0b50d | 147 | io_ring_submit_lock(ctx, issue_flags); |
73572984 | 148 | |
4ff0b50d | 149 | lockdep_assert_held(&ctx->uring_lock); |
68ef5578 | 150 | |
4ff0b50d PB |
151 | req->rsrc_node = ctx->rsrc_node; |
152 | io_charge_rsrc_node(ctx); | |
153 | io_ring_submit_unlock(ctx, issue_flags); | |
73572984 JA |
154 | } |
155 | } | |
156 | ||
157 | static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) | |
158 | { | |
159 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
160 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
161 | ||
162 | return &data->tags[table_idx][off]; | |
163 | } | |
164 | ||
d9808ceb PB |
165 | int io_files_update(struct io_kiocb *req, unsigned int issue_flags); |
166 | int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); | |
6a9ce66f PB |
167 | |
168 | int __io_account_mem(struct user_struct *user, unsigned long nr_pages); | |
169 | ||
170 | static inline void __io_unaccount_mem(struct user_struct *user, | |
171 | unsigned long nr_pages) | |
172 | { | |
173 | atomic_long_sub(nr_pages, &user->locked_vm); | |
174 | } | |
175 | ||
73572984 | 176 | #endif |