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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _BCACHEFS_DARRAY_H3#define _BCACHEFS_DARRAY_H4 5/*6 * Dynamic arrays:7 *8 * Inspired by CCAN's darray9 */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 */104