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
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
56 void io_rsrc_put_work(struct work_struct *work);
57 void io_rsrc_refs_refill(struct io_ring_ctx *ctx);
58 void io_wait_rsrc_data(struct io_rsrc_data *data);
59 void io_rsrc_node_destroy(struct io_rsrc_node *ref_node);
60 void io_rsrc_refs_drop(struct io_ring_ctx *ctx);
61 int io_rsrc_node_switch_start(struct io_ring_ctx *ctx);
62 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
63 struct io_rsrc_node *node, void *rsrc);
64 void io_rsrc_node_switch(struct io_ring_ctx *ctx,
65 struct io_rsrc_data *data_to_kill);
66
67 int io_import_fixed(int ddir, struct iov_iter *iter,
68 struct io_mapped_ubuf *imu,
69 u64 buf_addr, size_t len);
70
71 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
72 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
73 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
74 unsigned int nr_args, u64 __user *tags);
75 void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
76 int io_sqe_files_unregister(struct io_ring_ctx *ctx);
77 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
78 unsigned nr_args, u64 __user *tags);
79
80 int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
81
io_file_need_scm(struct file * filp)82 static inline bool io_file_need_scm(struct file *filp)
83 {
84 return false;
85 }
86
io_scm_file_account(struct io_ring_ctx * ctx,struct file * file)87 static inline int io_scm_file_account(struct io_ring_ctx *ctx,
88 struct file *file)
89 {
90 if (likely(!io_file_need_scm(file)))
91 return 0;
92 return __io_scm_file_account(ctx, file);
93 }
94
95 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
96 unsigned nr_args);
97 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
98 unsigned size, unsigned type);
99 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
100 unsigned int size, unsigned int type);
101
io_rsrc_put_node(struct io_rsrc_node * node,int nr)102 static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr)
103 {
104 percpu_ref_put_many(&node->refs, nr);
105 }
106
io_req_put_rsrc(struct io_kiocb * req)107 static inline void io_req_put_rsrc(struct io_kiocb *req)
108 {
109 if (req->rsrc_node)
110 io_rsrc_put_node(req->rsrc_node, 1);
111 }
112
io_req_put_rsrc_locked(struct io_kiocb * req,struct io_ring_ctx * ctx)113 static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
114 struct io_ring_ctx *ctx)
115 __must_hold(&ctx->uring_lock)
116 {
117 struct io_rsrc_node *node = req->rsrc_node;
118
119 if (node) {
120 if (node == ctx->rsrc_node)
121 ctx->rsrc_cached_refs++;
122 else
123 io_rsrc_put_node(node, 1);
124 }
125 }
126
io_charge_rsrc_node(struct io_ring_ctx * ctx)127 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx)
128 {
129 ctx->rsrc_cached_refs--;
130 if (unlikely(ctx->rsrc_cached_refs < 0))
131 io_rsrc_refs_refill(ctx);
132 }
133
io_req_set_rsrc_node(struct io_kiocb * req,struct io_ring_ctx * ctx,unsigned int issue_flags)134 static inline void io_req_set_rsrc_node(struct io_kiocb *req,
135 struct io_ring_ctx *ctx,
136 unsigned int issue_flags)
137 {
138 if (!req->rsrc_node) {
139 io_ring_submit_lock(ctx, issue_flags);
140
141 lockdep_assert_held(&ctx->uring_lock);
142
143 req->rsrc_node = ctx->rsrc_node;
144 io_charge_rsrc_node(ctx);
145 io_ring_submit_unlock(ctx, issue_flags);
146 }
147 }
148
io_get_tag_slot(struct io_rsrc_data * data,unsigned int idx)149 static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
150 {
151 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
152 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
153
154 return &data->tags[table_idx][off];
155 }
156
157 int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
158 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
159
160 int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
161
__io_unaccount_mem(struct user_struct * user,unsigned long nr_pages)162 static inline void __io_unaccount_mem(struct user_struct *user,
163 unsigned long nr_pages)
164 {
165 atomic_long_sub(nr_pages, &user->locked_vm);
166 }
167
168 #endif
169