Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _BCACHEFS_DARRAY_H
3#define _BCACHEFS_DARRAY_H
4
5/*
6 * Dynamic arrays:
7 *
8 * Inspired by CCAN's darray
9 */
10
11#include "util.h"
12#include <linux/slab.h>
13
14#define DARRAY(type) \
15struct { \
16 size_t nr, size; \
17 type *data; \
18}
19
20typedef DARRAY(void) darray_void;
21
22static inline int __darray_make_room(darray_void *d, size_t t_size, size_t more, gfp_t gfp)
23{
24 if (d->nr + more > d->size) {
25 size_t new_size = roundup_pow_of_two(d->nr + more);
26 void *data = krealloc_array(d->data, new_size, t_size, gfp);
27
28 if (!data)
29 return -ENOMEM;
30
31 d->data = data;
32 d->size = new_size;
33 }
34
35 return 0;
36}
37
38#define darray_make_room_gfp(_d, _more, _gfp) \
39 __darray_make_room((darray_void *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
40
41#define darray_make_room(_d, _more) \
42 darray_make_room_gfp(_d, _more, GFP_KERNEL)
43
44#define darray_top(_d) ((_d).data[(_d).nr])
45
46#define darray_push_gfp(_d, _item, _gfp) \
47({ \
48 int _ret = darray_make_room_gfp((_d), 1, _gfp); \
49 \
50 if (!_ret) \
51 (_d)->data[(_d)->nr++] = (_item); \
52 _ret; \
53})
54
55#define darray_push(_d, _item) darray_push_gfp(_d, _item, GFP_KERNEL)
56
57#define darray_pop(_d) ((_d)->data[--(_d)->nr])
58
59#define darray_first(_d) ((_d).data[0])
60#define darray_last(_d) ((_d).data[(_d).nr - 1])
61
62#define darray_insert_item(_d, pos, _item) \
63({ \
64 size_t _pos = (pos); \
65 int _ret = darray_make_room((_d), 1); \
66 \
67 if (!_ret) \
68 array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \
69 _ret; \
70})
71
72#define darray_remove_item(_d, _pos) \
73 array_remove_item((_d)->data, (_d)->nr, (_pos) - (_d)->data)
74
75#define darray_for_each(_d, _i) \
76 for (_i = (_d).data; _i < (_d).data + (_d).nr; _i++)
77
78#define darray_for_each_reverse(_d, _i) \
79 for (_i = (_d).data + (_d).nr - 1; _i >= (_d).data; --_i)
80
81#define darray_init(_d) \
82do { \
83 (_d)->data = NULL; \
84 (_d)->nr = (_d)->size = 0; \
85} while (0)
86
87#define darray_exit(_d) \
88do { \
89 kfree((_d)->data); \
90 darray_init(_d); \
91} while (0)
92
93#endif /* _BCACHEFS_DARRAY_H */