Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _BCACHEFS_DARRAY_H #define _BCACHEFS_DARRAY_H /* * Dynamic arrays: * * Inspired by CCAN's darray */ #include <linux/slab.h> #define DARRAY_PREALLOCATED(_type, _nr) \ struct { \ size_t nr, size; \ _type *data; \ _type preallocated[_nr]; \ } #define DARRAY(_type) DARRAY_PREALLOCATED(_type, 0) typedef DARRAY(char) darray_char; int __bch2_darray_resize(darray_char *, size_t, size_t, gfp_t); static inline int __darray_resize(darray_char *d, size_t element_size, size_t new_size, gfp_t gfp) { return unlikely(new_size > d->size) ? __bch2_darray_resize(d, element_size, new_size, gfp) : 0; } #define darray_resize_gfp(_d, _new_size, _gfp) \ unlikely(__darray_resize((darray_char *) (_d), sizeof((_d)->data[0]), (_new_size), _gfp)) #define darray_resize(_d, _new_size) \ darray_resize_gfp(_d, _new_size, GFP_KERNEL) static inline int __darray_make_room(darray_char *d, size_t t_size, size_t more, gfp_t gfp) { return __darray_resize(d, t_size, d->nr + more, gfp); } #define darray_make_room_gfp(_d, _more, _gfp) \ __darray_make_room((darray_char *) (_d), sizeof((_d)->data[0]), (_more), _gfp) #define darray_make_room(_d, _more) \ darray_make_room_gfp(_d, _more, GFP_KERNEL) #define darray_room(_d) ((_d).size - (_d).nr) #define darray_top(_d) ((_d).data[(_d).nr]) #define darray_push_gfp(_d, _item, _gfp) \ ({ \ int _ret = darray_make_room_gfp((_d), 1, _gfp); \ \ if (!_ret) \ (_d)->data[(_d)->nr++] = (_item); \ _ret; \ }) #define darray_push(_d, _item) darray_push_gfp(_d, _item, GFP_KERNEL) #define darray_pop(_d) ((_d)->data[--(_d)->nr]) #define darray_first(_d) ((_d).data[0]) #define darray_last(_d) ((_d).data[(_d).nr - 1]) #define darray_insert_item(_d, pos, _item) \ ({ \ size_t _pos = (pos); \ int _ret = darray_make_room((_d), 1); \ \ if (!_ret) \ array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \ _ret; \ }) #define darray_remove_item(_d, _pos) \ array_remove_item((_d)->data, (_d)->nr, (_pos) - (_d)->data) #define darray_for_each(_d, _i) \ for (_i = (_d).data; _i < (_d).data + (_d).nr; _i++) #define darray_for_each_reverse(_d, _i) \ for (_i = (_d).data + (_d).nr - 1; _i >= (_d).data; --_i) #define darray_init(_d) \ do { \ (_d)->nr = 0; \ (_d)->size = ARRAY_SIZE((_d)->preallocated); \ (_d)->data = (_d)->size ? (_d)->preallocated : NULL; \ } while (0) #define darray_exit(_d) \ do { \ if (!ARRAY_SIZE((_d)->preallocated) || \ (_d)->data != (_d)->preallocated) \ kvfree((_d)->data); \ darray_init(_d); \ } while (0) #endif /* _BCACHEFS_DARRAY_H */ |