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 <linux/slab.h>
12
13#define DARRAY_PREALLOCATED(_type, _nr) \
14struct { \
15 size_t nr, size; \
16 _type *data; \
17 _type preallocated[_nr]; \
18}
19
20#define DARRAY(_type) DARRAY_PREALLOCATED(_type, 0)
21
22typedef DARRAY(char) darray_char;
23
24int __bch2_darray_resize(darray_char *, size_t, size_t, gfp_t);
25
26static inline int __darray_resize(darray_char *d, size_t element_size,
27 size_t new_size, gfp_t gfp)
28{
29 return unlikely(new_size > d->size)
30 ? __bch2_darray_resize(d, element_size, new_size, gfp)
31 : 0;
32}
33
34#define darray_resize_gfp(_d, _new_size, _gfp) \
35 unlikely(__darray_resize((darray_char *) (_d), sizeof((_d)->data[0]), (_new_size), _gfp))
36
37#define darray_resize(_d, _new_size) \
38 darray_resize_gfp(_d, _new_size, GFP_KERNEL)
39
40static inline int __darray_make_room(darray_char *d, size_t t_size, size_t more, gfp_t gfp)
41{
42 return __darray_resize(d, t_size, d->nr + more, gfp);
43}
44
45#define darray_make_room_gfp(_d, _more, _gfp) \
46 __darray_make_room((darray_char *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
47
48#define darray_make_room(_d, _more) \
49 darray_make_room_gfp(_d, _more, GFP_KERNEL)
50
51#define darray_room(_d) ((_d).size - (_d).nr)
52
53#define darray_top(_d) ((_d).data[(_d).nr])
54
55#define darray_push_gfp(_d, _item, _gfp) \
56({ \
57 int _ret = darray_make_room_gfp((_d), 1, _gfp); \
58 \
59 if (!_ret) \
60 (_d)->data[(_d)->nr++] = (_item); \
61 _ret; \
62})
63
64#define darray_push(_d, _item) darray_push_gfp(_d, _item, GFP_KERNEL)
65
66#define darray_pop(_d) ((_d)->data[--(_d)->nr])
67
68#define darray_first(_d) ((_d).data[0])
69#define darray_last(_d) ((_d).data[(_d).nr - 1])
70
71#define darray_insert_item(_d, pos, _item) \
72({ \
73 size_t _pos = (pos); \
74 int _ret = darray_make_room((_d), 1); \
75 \
76 if (!_ret) \
77 array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \
78 _ret; \
79})
80
81#define darray_remove_item(_d, _pos) \
82 array_remove_item((_d)->data, (_d)->nr, (_pos) - (_d)->data)
83
84#define darray_for_each(_d, _i) \
85 for (_i = (_d).data; _i < (_d).data + (_d).nr; _i++)
86
87#define darray_for_each_reverse(_d, _i) \
88 for (_i = (_d).data + (_d).nr - 1; _i >= (_d).data; --_i)
89
90#define darray_init(_d) \
91do { \
92 (_d)->nr = 0; \
93 (_d)->size = ARRAY_SIZE((_d)->preallocated); \
94 (_d)->data = (_d)->size ? (_d)->preallocated : NULL; \
95} while (0)
96
97#define darray_exit(_d) \
98do { \
99 if (!ARRAY_SIZE((_d)->preallocated) || \
100 (_d)->data != (_d)->preallocated) \
101 kvfree((_d)->data); \
102 darray_init(_d); \
103} while (0)
104
105#endif /* _BCACHEFS_DARRAY_H */