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_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) \ 89 do { \ 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) \ 96 do { \ 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 */ 104