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_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
79 unsigned nr_args);
80 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
81 unsigned size, unsigned type);
82 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
83 unsigned int size, unsigned int type);
84
io_put_rsrc_node(struct io_ring_ctx * ctx,struct io_rsrc_node * node)85 static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
86 {
87 lockdep_assert_held(&ctx->uring_lock);
88
89 if (node && !--node->refs)
90 io_rsrc_node_ref_zero(node);
91 }
92
io_req_put_rsrc_locked(struct io_kiocb * req,struct io_ring_ctx * ctx)93 static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
94 struct io_ring_ctx *ctx)
95 {
96 io_put_rsrc_node(ctx, req->rsrc_node);
97 }
98
io_charge_rsrc_node(struct io_ring_ctx * ctx,struct io_rsrc_node * node)99 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
100 struct io_rsrc_node *node)
101 {
102 node->refs++;
103 }
104
io_req_set_rsrc_node(struct io_kiocb * req,struct io_ring_ctx * ctx,unsigned int issue_flags)105 static inline void io_req_set_rsrc_node(struct io_kiocb *req,
106 struct io_ring_ctx *ctx,
107 unsigned int issue_flags)
108 {
109 if (!req->rsrc_node) {
110 io_ring_submit_lock(ctx, issue_flags);
111
112 lockdep_assert_held(&ctx->uring_lock);
113
114 req->rsrc_node = ctx->rsrc_node;
115 io_charge_rsrc_node(ctx, ctx->rsrc_node);
116 io_ring_submit_unlock(ctx, issue_flags);
117 }
118 }
119
io_get_tag_slot(struct io_rsrc_data * data,unsigned int idx)120 static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
121 {
122 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
123 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
124
125 return &data->tags[table_idx][off];
126 }
127
io_rsrc_init(struct io_ring_ctx * ctx)128 static inline int io_rsrc_init(struct io_ring_ctx *ctx)
129 {
130 ctx->rsrc_node = io_rsrc_node_alloc(ctx);
131 return ctx->rsrc_node ? 0 : -ENOMEM;
132 }
133
134 int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
135 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
136
137 int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
138
__io_unaccount_mem(struct user_struct * user,unsigned long nr_pages)139 static inline void __io_unaccount_mem(struct user_struct *user,
140 unsigned long nr_pages)
141 {
142 atomic_long_sub(nr_pages, &user->locked_vm);
143 }
144
145 #endif
146