git.sesse.net Git - bcachefs-tools-debian/blob - c_src/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_PREALLOCATED(_type, _nr)                                 \
  14 struct {                                                                \
  15         size_t nr, size;                                                \
  16         _type *data;                                                    \
  17         _type preallocated[_nr];                                        \
  18 }
  19
  20 #define DARRAY(_type) DARRAY_PREALLOCATED(_type, 0)
  21
  22 typedef DARRAY(char)    darray_char;
  23 typedef DARRAY(char *) darray_str;
  24
  25 int __bch2_darray_resize(darray_char *, size_t, size_t, gfp_t);
  26
  27 static inline int __darray_resize(darray_char *d, size_t element_size,
  28                                   size_t new_size, gfp_t gfp)
  29 {
  30         return unlikely(new_size > d->size)
  31                 ? __bch2_darray_resize(d, element_size, new_size, gfp)
  32                 : 0;
  33 }
  34
  35 #define darray_resize_gfp(_d, _new_size, _gfp)                          \
  36         unlikely(__darray_resize((darray_char *) (_d), sizeof((_d)->data[0]), (_new_size), _gfp))
  37
  38 #define darray_resize(_d, _new_size)                                    \
  39         darray_resize_gfp(_d, _new_size, GFP_KERNEL)
  40
  41 static inline int __darray_make_room(darray_char *d, size_t t_size, size_t more, gfp_t gfp)
  42 {
  43         return __darray_resize(d, t_size, d->nr + more, gfp);
  44 }
  45
  46 #define darray_make_room_gfp(_d, _more, _gfp)                           \
  47         __darray_make_room((darray_char *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
  48
  49 #define darray_make_room(_d, _more)                                     \
  50         darray_make_room_gfp(_d, _more, GFP_KERNEL)
  51
  52 #define darray_room(_d)         ((_d).size - (_d).nr)
  53
  54 #define darray_top(_d)          ((_d).data[(_d).nr])
  55
  56 #define darray_push_gfp(_d, _item, _gfp)                                \
  57 ({                                                                      \
  58         int _ret = darray_make_room_gfp((_d), 1, _gfp);                 \
  59                                                                         \
  60         if (!_ret)                                                      \
  61                 (_d)->data[(_d)->nr++] = (_item);                       \
  62         _ret;                                                           \
  63 })
  64
  65 #define darray_push(_d, _item)  darray_push_gfp(_d, _item, GFP_KERNEL)
  66
  67 #define darray_pop(_d)          ((_d)->data[--(_d)->nr])
  68
  69 #define darray_first(_d)        ((_d).data[0])
  70 #define darray_last(_d)         ((_d).data[(_d).nr - 1])
  71
  72 #define darray_insert_item(_d, pos, _item)                              \
  73 ({                                                                      \
  74         size_t _pos = (pos);                                            \
  75         int _ret = darray_make_room((_d), 1);                           \
  76                                                                         \
  77         if (!_ret)                                                      \
  78                 array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \
  79         _ret;                                                           \
  80 })
  81
  82 #define darray_remove_item(_d, _pos)                                    \
  83         array_remove_item((_d)->data, (_d)->nr, (_pos) - (_d)->data)
  84
  85 #define __darray_for_each(_d, _i)                                               \
  86         for ((_i) = (_d).data; _i < (_d).data + (_d).nr; _i++)
  87
  88 #define darray_for_each(_d, _i)                                         \
  89         for (typeof(&(_d).data[0]) _i = (_d).data; _i < (_d).data + (_d).nr; _i++)
  90
  91 #define darray_for_each_reverse(_d, _i)                                 \
  92         for (typeof(&(_d).data[0]) _i = (_d).data + (_d).nr - 1; _i >= (_d).data; --_i)
  93
  94 #define darray_init(_d)                                                 \
  95 do {                                                                    \
  96         (_d)->nr = 0;                                                   \
  97         (_d)->size = ARRAY_SIZE((_d)->preallocated);                    \
  98         (_d)->data = (_d)->size ? (_d)->preallocated : NULL;            \
  99 } while (0)
 100
 101 #define darray_exit(_d)                                                 \
 102 do {                                                                    \
 103         if (!ARRAY_SIZE((_d)->preallocated) ||                          \
 104             (_d)->data != (_d)->preallocated)                           \
 105                 kvfree((_d)->data);                                     \
 106         darray_init(_d);                                                \
 107 } while (0)
 108
 109 #endif /* _BCACHEFS_DARRAY_H */