git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/darray.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_DARRAY_H
   3 #define _BCACHEFS_DARRAY_H
   4
   5 /*
   6  * Dynamic arrays:
   7  *
   8  * Inspired by CCAN's darray
   9  */
  10
  11 #include "util.h"
  12 #include <linux/slab.h>
  13
  14 #define DARRAY(type)                                                    \
  15 struct {                                                                \
  16         size_t nr, size;                                                \
  17         type *data;                                                     \
  18 }
  19
  20 typedef DARRAY(void) darray_void;
  21
  22 static inline int __darray_make_room(darray_void *d, size_t t_size, size_t more)
  23 {
  24         if (d->nr + more > d->size) {
  25                 size_t new_size = roundup_pow_of_two(d->nr + more);
  26                 void *data = krealloc_array(d->data, new_size, t_size, GFP_KERNEL);
  27
  28                 if (!data)
  29                         return -ENOMEM;
  30
  31                 d->data = data;
  32                 d->size = new_size;
  33         }
  34
  35         return 0;
  36 }
  37
  38 #define darray_make_room(_d, _more)                                     \
  39         __darray_make_room((darray_void *) (_d), sizeof((_d)->data[0]), (_more))
  40
  41 #define darray_top(_d)          ((_d).data[(_d).nr])
  42
  43 #define darray_push(_d, _item)                                          \
  44 ({                                                                      \
  45         int _ret = darray_make_room((_d), 1);                           \
  46                                                                         \
  47         if (!_ret)                                                      \
  48                 (_d)->data[(_d)->nr++] = (_item);                       \
  49         _ret;                                                           \
  50 })
  51
  52 #define darray_insert_item(_d, _pos, _item)                             \
  53 ({                                                                      \
  54         int _ret = darray_make_room((_d), 1);                           \
  55                                                                         \
  56         if (!_ret)                                                      \
  57                 array_insert_item((_d)->data, (_d)->nr, (_pos), (_item));\
  58         _ret;                                                           \
  59 })
  60
  61 #define darray_for_each(_d, _i)                                         \
  62         for (_i = (_d).data; _i < (_d).data + (_d).nr; _i++)
  63
  64 #define darray_init(_d)                                                 \
  65 do {                                                                    \
  66         (_d)->data = NULL;                                              \
  67         (_d)->nr = (_d)->size = 0;                                      \
  68 } while (0)
  69
  70 #define darray_exit(_d)                                                 \
  71 do {                                                                    \
  72         kfree((_d)->data);                                              \
  73         darray_init(_d);                                                \
  74 } while (0)
  75
  76 #endif /* _BCACHEFS_DARRAY_H */