/* 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;typedef DARRAY(char *) darray_str; 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(_d, _i)						\	for (typeof(&(_d).data[0]) _i = (_d).data; _i < (_d).data + (_d).nr; _i++) #define darray_for_each_reverse(_d, _i)					\	for (typeof(&(_d).data[0]) _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 */