linux/linux

the linux kernel

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Linus TorvaldsLinux 7.3-rc1cee9395acd80

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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