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;
23typedef DARRAY(char *) darray_str;
24
25int __bch2_darray_resize_noprof(darray_char *, size_t, size_t, gfp_t);
26
27#define __bch2_darray_resize(...) alloc_hooks(__bch2_darray_resize_noprof(__VA_ARGS__))
28
29#define __darray_resize(_d, _element_size, _new_size, _gfp) \
30 (unlikely((_new_size) > (_d)->size) \
31 ? __bch2_darray_resize((_d), (_element_size), (_new_size), (_gfp))\
32 : 0)
33
34#define darray_resize_gfp(_d, _new_size, _gfp) \
35 __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
40#define darray_make_room_gfp(_d, _more, _gfp) \
41 darray_resize_gfp((_d), (_d)->nr + (_more), _gfp)
42
43#define darray_make_room(_d, _more) \
44 darray_make_room_gfp(_d, _more, GFP_KERNEL)
45
46#define darray_room(_d) ((_d).size - (_d).nr)
47
48#define darray_top(_d) ((_d).data[(_d).nr])
49
50#define darray_push_gfp(_d, _item, _gfp) \
51({ \
52 int _ret = darray_make_room_gfp((_d), 1, _gfp); \
53 \
54 if (!_ret) \
55 (_d)->data[(_d)->nr++] = (_item); \
56 _ret; \
57})
58
59#define darray_push(_d, _item) darray_push_gfp(_d, _item, GFP_KERNEL)
60
61#define darray_pop(_d) ((_d)->data[--(_d)->nr])
62
63#define darray_first(_d) ((_d).data[0])
64#define darray_last(_d) ((_d).data[(_d).nr - 1])
65
66#define darray_insert_item(_d, pos, _item) \
67({ \
68 size_t _pos = (pos); \
69 int _ret = darray_make_room((_d), 1); \
70 \
71 if (!_ret) \
72 array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \
73 _ret; \
74})
75
76#define darray_remove_item(_d, _pos) \
77 array_remove_item((_d)->data, (_d)->nr, (_pos) - (_d)->data)
78
79#define __darray_for_each(_d, _i) \
80 for ((_i) = (_d).data; _i < (_d).data + (_d).nr; _i++)
81
82#define darray_for_each(_d, _i) \
83 for (typeof(&(_d).data[0]) _i = (_d).data; _i < (_d).data + (_d).nr; _i++)
84
85#define darray_for_each_reverse(_d, _i) \
86 for (typeof(&(_d).data[0]) _i = (_d).data + (_d).nr - 1; _i >= (_d).data; --_i)
87
88#define darray_init(_d) \
89do { \
90 (_d)->nr = 0; \
91 (_d)->size = ARRAY_SIZE((_d)->preallocated); \
92 (_d)->data = (_d)->size ? (_d)->preallocated : NULL; \
93} while (0)
94
95#define darray_exit(_d) \
96do { \
97 if (!ARRAY_SIZE((_d)->preallocated) || \
98 (_d)->data != (_d)->preallocated) \
99 kvfree((_d)->data); \
100 darray_init(_d); \
101} while (0)
102
103#endif /* _BCACHEFS_DARRAY_H */