88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_DARRAY_H
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#define _BCACHEFS_DARRAY_H
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/*
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* Dynamic arrays:
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*
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* Inspired by CCAN's darray
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*/
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#include "util.h"
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#include <linux/slab.h>
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#define DARRAY(type) \
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struct { \
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size_t nr, size; \
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type *data; \
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}
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typedef DARRAY(void) darray_void;
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static inline int __darray_make_room(darray_void *d, size_t t_size, size_t more, gfp_t gfp)
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{
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if (d->nr + more > d->size) {
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size_t new_size = roundup_pow_of_two(d->nr + more);
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void *data = krealloc_array(d->data, new_size, t_size, gfp);
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if (!data)
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return -ENOMEM;
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d->data = data;
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d->size = new_size;
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}
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return 0;
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}
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#define darray_make_room_gfp(_d, _more, _gfp) \
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__darray_make_room((darray_void *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
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#define darray_make_room(_d, _more) \
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darray_make_room_gfp(_d, _more, GFP_KERNEL)
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#define darray_top(_d) ((_d).data[(_d).nr])
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#define darray_push_gfp(_d, _item, _gfp) \
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({ \
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int _ret = darray_make_room_gfp((_d), 1, _gfp); \
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\
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if (!_ret) \
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(_d)->data[(_d)->nr++] = (_item); \
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_ret; \
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})
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#define darray_push(_d, _item) darray_push_gfp(_d, _item, GFP_KERNEL)
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#define darray_pop(_d) ((_d)->data[--(_d)->nr])
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#define darray_first(_d) ((_d).data[0])
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#define darray_last(_d) ((_d).data[(_d).nr - 1])
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#define darray_insert_item(_d, pos, _item) \
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({ \
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size_t _pos = (pos); \
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int _ret = darray_make_room((_d), 1); \
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\
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if (!_ret) \
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array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \
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_ret; \
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})
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#define darray_for_each(_d, _i) \
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for (_i = (_d).data; _i < (_d).data + (_d).nr; _i++)
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#define darray_init(_d) \
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do { \
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(_d)->data = NULL; \
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(_d)->nr = (_d)->size = 0; \
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} while (0)
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#define darray_exit(_d) \
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do { \
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kfree((_d)->data); \
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darray_init(_d); \
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} while (0)
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#endif /* _BCACHEFS_DARRAY_H */
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