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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_DARRAY_H
#define _BCACHEFS_DARRAY_H
/*
* Dynamic arrays:
*
* Inspired by CCAN's darray
*/
#include "util.h"
#include <linux/slab.h>
#define DARRAY(type) \
struct { \
size_t nr, size; \
type *data; \
}
typedef DARRAY(void) darray_void;
static inline int __darray_make_room(darray_void *d, size_t t_size, size_t more, gfp_t gfp)
{
if (d->nr + more > d->size) {
size_t new_size = roundup_pow_of_two(d->nr + more);
void *data = krealloc_array(d->data, new_size, t_size, gfp);
if (!data)
return -ENOMEM;
d->data = data;
d->size = new_size;
}
return 0;
}
#define darray_make_room_gfp(_d, _more, _gfp) \
__darray_make_room((darray_void *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
#define darray_make_room(_d, _more) \
darray_make_room_gfp(_d, _more, GFP_KERNEL)
#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)->data = NULL; \
(_d)->nr = (_d)->size = 0; \
} while (0)
#define darray_exit(_d) \
do { \
kfree((_d)->data); \
darray_init(_d); \
} while (0)
#endif /* _BCACHEFS_DARRAY_H */
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