LXR linux/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
  22struct 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
  30struct 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
  43struct 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
  49struct inode *lookup_free_space_inode(struct btrfs_root *root,
  50                                      struct btrfs_block_group_cache
  51                                      *block_group, struct btrfs_path *path);
  52int 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
  57int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
  58                                       struct btrfs_block_rsv *rsv);
  59int btrfs_truncate_free_space_cache(struct btrfs_root *root,
  60                                    struct btrfs_trans_handle *trans,
  61                                    struct inode *inode);
  62int load_free_space_cache(struct btrfs_fs_info *fs_info,
  63                          struct btrfs_block_group_cache *block_group);
  64int 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
  69struct inode *lookup_free_ino_inode(struct btrfs_root *root,
  70                                    struct btrfs_path *path);
  71int create_free_ino_inode(struct btrfs_root *root,
  72                          struct btrfs_trans_handle *trans,
  73                          struct btrfs_path *path);
  74int load_free_ino_cache(struct btrfs_fs_info *fs_info,
  75                        struct btrfs_root *root);
  76int 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
  81void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
  82int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
  83                           u64 bytenr, u64 size);
  84static inline int
  85btrfs_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}
  91int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
  92                            u64 bytenr, u64 size);
  93void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
  94void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
  95                                     *block_group);
  96u64 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);
  99u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
 100void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
 101                           u64 bytes);
 102int 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);
 106void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
 107u64 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);
 110int btrfs_return_cluster_to_free_space(
 111                               struct btrfs_block_group_cache *block_group,
 112                               struct btrfs_free_cluster *cluster);
 113int 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
 118int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
 119                              u64 offset, u64 bytes, bool bitmap);
 120int test_check_exists(struct btrfs_block_group_cache *cache,
 121                      u64 offset, u64 bytes);
 122#endif
 123
 124#endif
 125