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
11 enum {
12 IORING_RSRC_FILE = 0,
13 IORING_RSRC_BUFFER = 1,
14 };
15
16 struct io_rsrc_put {
17 u64 tag;
18 union {
19 void *rsrc;
20 struct file *file;
21 struct io_mapped_ubuf *buf;
22 };
23 };
24
25 typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
26
27 struct 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
36 struct 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
45 struct 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
53 void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
54 void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
55 struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
56 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
57
58 int io_import_fixed(int ddir, struct iov_iter *iter,
59 struct io_mapped_ubuf *imu,
60 u64 buf_addr, size_t len);
61
62 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
63 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
64 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
65 unsigned int nr_args, u64 __user *tags);
66 void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
67 int io_sqe_files_unregister(struct io_ring_ctx *ctx);
68 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
69 unsigned nr_args, u64 __user *tags);
70
71 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
72 unsigned nr_args);
73 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
74 unsigned size, unsigned type);
75 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
76 unsigned int size, unsigned int type);
77
78 static 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
86 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
87 struct io_rsrc_node *node)
88 {
89 node->refs++;
90 }
91
92 static 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
100 static 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
111 static 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
119 static 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
125 int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
126 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
127
128 int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
129
130 static 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
137
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