fs/btrfs/free-space-cache.h

   1 /*
   2  * Copyright (C) 2009 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS_FREE_SPACE_CACHE
  20 #define __BTRFS_FREE_SPACE_CACHE
  21
  22 struct btrfs_free_space {
  23         struct rb_node offset_index;
  24         u64 offset;
  25         u64 bytes;
  26         unsigned long *bitmap;
  27         struct list_head list;
  28 };
  29
  30 struct btrfs_free_space_ctl {
  31         spinlock_t tree_lock;
  32         struct rb_root free_space_offset;
  33         u64 free_space;
  34         int extents_thresh;
  35         int free_extents;
  36         int total_bitmaps;
  37         int unit;
  38         u64 start;
  39         struct btrfs_free_space_op *op;
  40         void *private;
  41 };
  42
  43 struct btrfs_free_space_op {
  44         void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
  45         bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
  46                            struct btrfs_free_space *info);
  47 };
  48
  49 struct inode *lookup_free_space_inode(struct btrfs_root *root,
  50                                       struct btrfs_block_group_cache
  51                                       *block_group, struct btrfs_path *path);
  52 int create_free_space_inode(struct btrfs_root *root,
  53                             struct btrfs_trans_handle *trans,
  54                             struct btrfs_block_group_cache *block_group,
  55                             struct btrfs_path *path);
  56
  57 int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
  58                                        struct btrfs_block_rsv *rsv);
  59 int btrfs_truncate_free_space_cache(struct btrfs_root *root,
  60                                     struct btrfs_trans_handle *trans,
  61                                     struct inode *inode);
  62 int load_free_space_cache(struct btrfs_fs_info *fs_info,
  63                           struct btrfs_block_group_cache *block_group);
  64 int btrfs_write_out_cache(struct btrfs_root *root,
  65                           struct btrfs_trans_handle *trans,
  66                           struct btrfs_block_group_cache *block_group,
  67                           struct btrfs_path *path);
  68
  69 struct inode *lookup_free_ino_inode(struct btrfs_root *root,
  70                                     struct btrfs_path *path);
  71 int create_free_ino_inode(struct btrfs_root *root,
  72                           struct btrfs_trans_handle *trans,
  73                           struct btrfs_path *path);
  74 int load_free_ino_cache(struct btrfs_fs_info *fs_info,
  75                         struct btrfs_root *root);
  76 int btrfs_write_out_ino_cache(struct btrfs_root *root,
  77                               struct btrfs_trans_handle *trans,
  78                               struct btrfs_path *path,
  79                               struct inode *inode);
  80
  81 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
  82 int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
  83                            u64 bytenr, u64 size);
  84 static inline int
  85 btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
  86                      u64 bytenr, u64 size)
  87 {
  88         return __btrfs_add_free_space(block_group->free_space_ctl,
  89                                       bytenr, size);
  90 }
  91 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
  92                             u64 bytenr, u64 size);
  93 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
  94 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
  95                                      *block_group);
  96 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
  97                                u64 offset, u64 bytes, u64 empty_size,
  98                                u64 *max_extent_size);
  99 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
 100 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
 101                            u64 bytes);
 102 int btrfs_find_space_cluster(struct btrfs_root *root,
 103                              struct btrfs_block_group_cache *block_group,
 104                              struct btrfs_free_cluster *cluster,
 105                              u64 offset, u64 bytes, u64 empty_size);
 106 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
 107 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
 108                              struct btrfs_free_cluster *cluster, u64 bytes,
 109                              u64 min_start, u64 *max_extent_size);
 110 int btrfs_return_cluster_to_free_space(
 111                                struct btrfs_block_group_cache *block_group,
 112                                struct btrfs_free_cluster *cluster);
 113 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
 114                            u64 *trimmed, u64 start, u64 end, u64 minlen);
 115
 116 /* Support functions for runnint our sanity tests */
 117 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 118 int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
 119                               u64 offset, u64 bytes, bool bitmap);
 120 int test_check_exists(struct btrfs_block_group_cache *cache,
 121                       u64 offset, u64 bytes);
 122 #endif
 123
 124 #endif