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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 <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 */
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