mirror of
https://github.com/torvalds/linux.git
synced 2024-12-28 13:51:44 +00:00
91d961badf
Inspired by CCAN darray - simple, stupid resizable (dynamic) arrays. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/* 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)
|
|
{
|
|
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_KERNEL);
|
|
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
d->data = data;
|
|
d->size = new_size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define darray_make_room(_d, _more) \
|
|
__darray_make_room((darray_void *) (_d), sizeof((_d)->data[0]), (_more))
|
|
|
|
#define darray_top(_d) ((_d).data[(_d).nr])
|
|
|
|
#define darray_push(_d, _item) \
|
|
({ \
|
|
int _ret = darray_make_room((_d), 1); \
|
|
\
|
|
if (!_ret) \
|
|
(_d)->data[(_d)->nr++] = (_item); \
|
|
_ret; \
|
|
})
|
|
|
|
#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_for_each(_d, _i) \
|
|
for (_i = (_d).data; _i < (_d).data + (_d).nr; _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 */
|