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1// SPDX-License-Identifier: GPL-2.0
2#ifndef IOU_RSRC_H
3#define IOU_RSRC_H
4
5#include <linux/bvec.h>
6#include <linux/io_uring_types.h>
7#include <linux/lockdep.h>
8#include <linux/uio.h>
9
10#define IO_VEC_CACHE_SOFT_CAP 256
11
12enum {
13 IORING_RSRC_FILE = 0,
14 IORING_RSRC_BUFFER = 1,
15};
16
17struct io_rsrc_node {
18 unsigned char type;
19 int refs;
20
21 u64 tag;
22 union {
23 unsigned long file_ptr;
24 struct io_mapped_ubuf *buf;
25 };
26};
27
28enum {
29 IO_REGBUF_F_KBUF = 1,
30};
31
32struct io_mapped_ubuf {
33 u64 ubuf;
34 size_t len;
35 unsigned int nr_bvecs;
36 unsigned int folio_shift;
37 refcount_t refs;
38 u8 flags;
39 u8 dir;
40 void (*release)(void *);
41 void *priv;
42 struct bio_vec bvec[] __counted_by(nr_bvecs);
43};
44
45struct io_imu_folio_data {
46 /* Head folio can be partially included in the fixed buf */
47 unsigned int nr_pages_head;
48 /* For non-head/tail folios, has to be fully included */
49 unsigned int nr_pages_mid;
50 unsigned int folio_shift;
51 unsigned int nr_folios;
52 unsigned long first_folio_page_idx;
53};
54
55bool io_rsrc_cache_init(struct io_ring_ctx *ctx);
56void io_rsrc_cache_free(struct io_ring_ctx *ctx);
57struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type);
58void io_free_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node);
59void io_rsrc_data_free(struct io_ring_ctx *ctx, struct io_rsrc_data *data);
60int io_rsrc_data_alloc(struct io_rsrc_data *data, unsigned nr);
61
62struct io_rsrc_node *io_find_buf_node(struct io_kiocb *req,
63 unsigned issue_flags);
64int io_import_reg_buf(struct io_kiocb *req, struct iov_iter *iter,
65 u64 buf_addr, size_t len, int ddir,
66 unsigned issue_flags);
67int io_import_reg_vec(int ddir, struct iov_iter *iter,
68 struct io_kiocb *req, struct iou_vec *vec,
69 unsigned nr_iovs, unsigned issue_flags);
70int io_prep_reg_iovec(struct io_kiocb *req, struct iou_vec *iv,
71 const struct iovec __user *uvec, size_t uvec_segs);
72
73int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg);
74int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
75int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
76 unsigned int nr_args, u64 __user *tags);
77int io_sqe_files_unregister(struct io_ring_ctx *ctx);
78int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
79 unsigned nr_args, u64 __user *tags);
80
81int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
82 unsigned nr_args);
83int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
84 unsigned size, unsigned type);
85int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
86 unsigned int size, unsigned int type);
87int io_validate_user_buf_range(u64 uaddr, u64 ulen);
88
89bool io_check_coalesce_buffer(struct page **page_array, int nr_pages,
90 struct io_imu_folio_data *data);
91
92static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data,
93 unsigned int index)
94{
95 if (index < data->nr)
96 return data->nodes[array_index_nospec(index, data->nr)];
97 return NULL;
98}
99
100static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
101{
102 lockdep_assert_held(&ctx->uring_lock);
103 if (!--node->refs)
104 io_free_rsrc_node(ctx, node);
105}
106
107static inline bool io_reset_rsrc_node(struct io_ring_ctx *ctx,
108 struct io_rsrc_data *data,
109 unsigned int index)
110{
111 struct io_rsrc_node *node;
112
113 if (index >= data->nr)
114 return false;
115 index = array_index_nospec(index, data->nr);
116 node = data->nodes[index];
117 if (!node)
118 return false;
119 io_put_rsrc_node(ctx, node);
120 data->nodes[index] = NULL;
121 return true;
122}
123
124int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
125int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
126
127int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
128int io_account_mem(struct user_struct *user, struct mm_struct *mm_account,
129 unsigned long nr_pages);
130void io_unaccount_mem(struct user_struct *user, struct mm_struct *mm_account,
131 unsigned long nr_pages);
132
133static inline void __io_unaccount_mem(struct user_struct *user,
134 unsigned long nr_pages)
135{
136 atomic_long_sub(nr_pages, &user->locked_vm);
137}
138
139void io_vec_free(struct iou_vec *iv);
140int io_vec_realloc(struct iou_vec *iv, unsigned nr_entries);
141
142static inline void io_vec_reset_iovec(struct iou_vec *iv,
143 struct iovec *iovec, unsigned nr)
144{
145 io_vec_free(iv);
146 iv->iovec = iovec;
147 iv->nr = nr;
148}
149
150static inline void io_alloc_cache_vec_kasan(struct iou_vec *iv)
151{
152 if (IS_ENABLED(CONFIG_KASAN))
153 io_vec_free(iv);
154}
155
156#endif