drivers/md/persistent-data/dm-space-map.h

   1 /*
   2  * Copyright (C) 2011 Red Hat, Inc. All rights reserved.
   3  *
   4  * This file is released under the GPL.
   5  */
   6
   7 #ifndef _LINUX_DM_SPACE_MAP_H
   8 #define _LINUX_DM_SPACE_MAP_H
   9
  10 #include "dm-block-manager.h"
  11
  12 /*
  13  * struct dm_space_map keeps a record of how many times each block in a device
  14  * is referenced.  It needs to be fixed on disk as part of the transaction.
  15  */
  16 struct dm_space_map {
  17         void (*destroy)(struct dm_space_map *sm);
  18
  19         int (*extend)(struct dm_space_map *sm, dm_block_t extra_blocks);
  20
  21         int (*get_nr_blocks)(struct dm_space_map *sm, dm_block_t *count);
  22         int (*get_nr_free)(struct dm_space_map *sm, dm_block_t *count);
  23
  24         int (*get_count)(struct dm_space_map *sm, dm_block_t b, uint32_t *result);
  25         int (*count_is_more_than_one)(struct dm_space_map *sm, dm_block_t b,
  26                                       int *result);
  27         int (*set_count)(struct dm_space_map *sm, dm_block_t b, uint32_t count);
  28
  29         int (*commit)(struct dm_space_map *sm);
  30
  31         int (*inc_block)(struct dm_space_map *sm, dm_block_t b);
  32         int (*dec_block)(struct dm_space_map *sm, dm_block_t b);
  33
  34         /*
  35          * new_block will increment the returned block.
  36          */
  37         int (*new_block)(struct dm_space_map *sm, dm_block_t *b);
  38
  39         /*
  40          * The root contains all the information needed to fix the space map.
  41          * Generally this info is small, so squirrel it away in a disk block
  42          * along with other info.
  43          */
  44         int (*root_size)(struct dm_space_map *sm, size_t *result);
  45         int (*copy_root)(struct dm_space_map *sm, void *copy_to_here_le, size_t len);
  46 };
  47
  48 /*----------------------------------------------------------------*/
  49
  50 static inline void dm_sm_destroy(struct dm_space_map *sm)
  51 {
  52         sm->destroy(sm);
  53 }
  54
  55 static inline int dm_sm_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
  56 {
  57         return sm->extend(sm, extra_blocks);
  58 }
  59
  60 static inline int dm_sm_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
  61 {
  62         return sm->get_nr_blocks(sm, count);
  63 }
  64
  65 static inline int dm_sm_get_nr_free(struct dm_space_map *sm, dm_block_t *count)
  66 {
  67         return sm->get_nr_free(sm, count);
  68 }
  69
  70 static inline int dm_sm_get_count(struct dm_space_map *sm, dm_block_t b,
  71                                   uint32_t *result)
  72 {
  73         return sm->get_count(sm, b, result);
  74 }
  75
  76 static inline int dm_sm_count_is_more_than_one(struct dm_space_map *sm,
  77                                                dm_block_t b, int *result)
  78 {
  79         return sm->count_is_more_than_one(sm, b, result);
  80 }
  81
  82 static inline int dm_sm_set_count(struct dm_space_map *sm, dm_block_t b,
  83                                   uint32_t count)
  84 {
  85         return sm->set_count(sm, b, count);
  86 }
  87
  88 static inline int dm_sm_commit(struct dm_space_map *sm)
  89 {
  90         return sm->commit(sm);
  91 }
  92
  93 static inline int dm_sm_inc_block(struct dm_space_map *sm, dm_block_t b)
  94 {
  95         return sm->inc_block(sm, b);
  96 }
  97
  98 static inline int dm_sm_dec_block(struct dm_space_map *sm, dm_block_t b)
  99 {
 100         return sm->dec_block(sm, b);
 101 }
 102
 103 static inline int dm_sm_new_block(struct dm_space_map *sm, dm_block_t *b)
 104 {
 105         return sm->new_block(sm, b);
 106 }
 107
 108 static inline int dm_sm_root_size(struct dm_space_map *sm, size_t *result)
 109 {
 110         return sm->root_size(sm, result);
 111 }
 112
 113 static inline int dm_sm_copy_root(struct dm_space_map *sm, void *copy_to_here_le, size_t len)
 114 {
 115         return sm->copy_root(sm, copy_to_here_le, len);
 116 }
 117
 118 #endif  /* _LINUX_DM_SPACE_MAP_H */