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 <linux/slab.h>
  12
  13 #define DARRAY(type)                                                    \
  14 struct {                                                                \
  15         size_t nr, size;                                                \
  16         type *data;                                                     \
  17 }
  18
  19 typedef DARRAY(void) darray_void;
  20
  21 int __bch2_darray_resize(darray_void *, size_t, size_t, gfp_t);
  22
  23 static inline int __darray_resize(darray_void *d, size_t element_size,
  24                                   size_t new_size, gfp_t gfp)
  25 {
  26         return unlikely(new_size > d->size)
  27                 ? __bch2_darray_resize(d, element_size, new_size, gfp)
  28                 : 0;
  29 }
  30
  31 #define darray_resize_gfp(_d, _new_size, _gfp)                          \
  32         __darray_resize((darray_void *) (_d), sizeof((_d)->data[0]), (_new_size), _gfp)
  33
  34 #define darray_resize(_d, _new_size)                                    \
  35         darray_resize_gfp(_d, _new_size, GFP_KERNEL)
  36
  37 static inline int __darray_make_room(darray_void *d, size_t t_size, size_t more, gfp_t gfp)
  38 {
  39         return __darray_resize(d, t_size, d->nr + more, gfp);
  40 }
  41
  42 #define darray_make_room_gfp(_d, _more, _gfp)                           \
  43         __darray_make_room((darray_void *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
  44
  45 #define darray_make_room(_d, _more)                                     \
  46         darray_make_room_gfp(_d, _more, GFP_KERNEL)
  47
  48 #define darray_room(_d)         ((_d).size - (_d).nr)
  49
  50 #define darray_top(_d)          ((_d).data[(_d).nr])
  51
  52 #define darray_push_gfp(_d, _item, _gfp)                                \
  53 ({                                                                      \
  54         int _ret = darray_make_room_gfp((_d), 1, _gfp);                 \
  55                                                                         \
  56         if (!_ret)                                                      \
  57                 (_d)->data[(_d)->nr++] = (_item);                       \
  58         _ret;                                                           \
  59 })
  60
  61 #define darray_push(_d, _item)  darray_push_gfp(_d, _item, GFP_KERNEL)
  62
  63 #define darray_pop(_d)          ((_d)->data[--(_d)->nr])
  64
  65 #define darray_first(_d)        ((_d).data[0])
  66 #define darray_last(_d)         ((_d).data[(_d).nr - 1])
  67
  68 #define darray_insert_item(_d, pos, _item)                              \
  69 ({                                                                      \
  70         size_t _pos = (pos);                                            \
  71         int _ret = darray_make_room((_d), 1);                           \
  72                                                                         \
  73         if (!_ret)                                                      \
  74                 array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \
  75         _ret;                                                           \
  76 })
  77
  78 #define darray_remove_item(_d, _pos)                                    \
  79         array_remove_item((_d)->data, (_d)->nr, (_pos) - (_d)->data)
  80
  81 #define __darray_for_each(_d, _i)                                               \
  82         for ((_i) = (_d).data; _i < (_d).data + (_d).nr; _i++)
  83
  84 #define darray_for_each(_d, _i)                                         \
  85         for (typeof(&(_d).data[0]) _i = (_d).data; _i < (_d).data + (_d).nr; _i++)
  86
  87 #define darray_for_each_reverse(_d, _i)                                 \
  88         for (typeof(&(_d).data[0]) _i = (_d).data + (_d).nr - 1; _i >= (_d).data; --_i)
  89
  90 #define darray_init(_d)                                                 \
  91 do {                                                                    \
  92         (_d)->data = NULL;                                              \
  93         (_d)->nr = (_d)->size = 0;                                      \
  94 } while (0)
  95
  96 #define darray_exit(_d)                                                 \
  97 do {                                                                    \
  98         kvfree((_d)->data);                                             \
  99         darray_init(_d);                                                \
 100 } while (0)
 101
 102 #endif /* _BCACHEFS_DARRAY_H */