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) \
14 struct { \
15 size_t nr, size; \
16 _type *data; \
17 _type preallocated[_nr]; \
18 }
19
20 #define DARRAY(_type) DARRAY_PREALLOCATED(_type, 0)
21
22 typedef DARRAY(char) darray_char;
23 typedef DARRAY(char *) darray_str;
24
25 int __bch2_darray_resize(darray_char *, size_t, size_t, gfp_t);
26
27 static inline int __darray_resize(darray_char *d, size_t element_size,
28 size_t new_size, gfp_t gfp)
29 {
30 return unlikely(new_size > d->size)
31 ? __bch2_darray_resize(d, element_size, new_size, gfp)
32 : 0;
33 }
34
35 #define darray_resize_gfp(_d, _new_size, _gfp) \
36 unlikely(__darray_resize((darray_char *) (_d), sizeof((_d)->data[0]), (_new_size), _gfp))
37
38 #define darray_resize(_d, _new_size) \
39 darray_resize_gfp(_d, _new_size, GFP_KERNEL)
40
41 static inline int __darray_make_room(darray_char *d, size_t t_size, size_t more, gfp_t gfp)
42 {
43 return __darray_resize(d, t_size, d->nr + more, gfp);
44 }
45
46 #define darray_make_room_gfp(_d, _more, _gfp) \
47 __darray_make_room((darray_char *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
48
49 #define darray_make_room(_d, _more) \
50 darray_make_room_gfp(_d, _more, GFP_KERNEL)
51
52 #define darray_room(_d) ((_d).size - (_d).nr)
53
54 #define darray_top(_d) ((_d).data[(_d).nr])
55
56 #define darray_push_gfp(_d, _item, _gfp) \
57 ({ \
58 int _ret = darray_make_room_gfp((_d), 1, _gfp); \
59 \
60 if (!_ret) \
61 (_d)->data[(_d)->nr++] = (_item); \
62 _ret; \
63 })
64
65 #define darray_push(_d, _item) darray_push_gfp(_d, _item, GFP_KERNEL)
66
67 #define darray_pop(_d) ((_d)->data[--(_d)->nr])
68
69 #define darray_first(_d) ((_d).data[0])
70 #define darray_last(_d) ((_d).data[(_d).nr - 1])
71
72 #define darray_insert_item(_d, pos, _item) \
73 ({ \
74 size_t _pos = (pos); \
75 int _ret = darray_make_room((_d), 1); \
76 \
77 if (!_ret) \
78 array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \
79 _ret; \
80 })
81
82 #define darray_remove_item(_d, _pos) \
83 array_remove_item((_d)->data, (_d)->nr, (_pos) - (_d)->data)
84
85 #define __darray_for_each(_d, _i) \
86 for ((_i) = (_d).data; _i < (_d).data + (_d).nr; _i++)
87
88 #define darray_for_each(_d, _i) \
89 for (typeof(&(_d).data[0]) _i = (_d).data; _i < (_d).data + (_d).nr; _i++)
90
91 #define darray_for_each_reverse(_d, _i) \
92 for (typeof(&(_d).data[0]) _i = (_d).data + (_d).nr - 1; _i >= (_d).data; --_i)
93
94 #define darray_init(_d) \
95 do { \
96 (_d)->nr = 0; \
97 (_d)->size = ARRAY_SIZE((_d)->preallocated); \
98 (_d)->data = (_d)->size ? (_d)->preallocated : NULL; \
99 } while (0)
100
101 #define darray_exit(_d) \
102 do { \
103 if (!ARRAY_SIZE((_d)->preallocated) || \
104 (_d)->data != (_d)->preallocated) \
105 kvfree((_d)->data); \
106 darray_init(_d); \
107 } while (0)
108
109 #endif /* _BCACHEFS_DARRAY_H */
110
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