linux/fs/btrfs/free-space-cache.h
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   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_truncate_free_space_cache(struct btrfs_root *root,
  58                                    struct btrfs_trans_handle *trans,
  59                                    struct btrfs_path *path,
  60                                    struct inode *inode);
  61int load_free_space_cache(struct btrfs_fs_info *fs_info,
  62                          struct btrfs_block_group_cache *block_group);
  63int btrfs_write_out_cache(struct btrfs_root *root,
  64                          struct btrfs_trans_handle *trans,
  65                          struct btrfs_block_group_cache *block_group,
  66                          struct btrfs_path *path);
  67
  68struct inode *lookup_free_ino_inode(struct btrfs_root *root,
  69                                    struct btrfs_path *path);
  70int create_free_ino_inode(struct btrfs_root *root,
  71                          struct btrfs_trans_handle *trans,
  72                          struct btrfs_path *path);
  73int load_free_ino_cache(struct btrfs_fs_info *fs_info,
  74                        struct btrfs_root *root);
  75int btrfs_write_out_ino_cache(struct btrfs_root *root,
  76                              struct btrfs_trans_handle *trans,
  77                              struct btrfs_path *path);
  78
  79void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
  80int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
  81                           u64 bytenr, u64 size);
  82static inline int
  83btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
  84                     u64 bytenr, u64 size)
  85{
  86        return __btrfs_add_free_space(block_group->free_space_ctl,
  87                                      bytenr, size);
  88}
  89int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
  90                            u64 bytenr, u64 size);
  91void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
  92void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
  93                                     *block_group);
  94u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
  95                               u64 offset, u64 bytes, u64 empty_size);
  96u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
  97void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
  98                           u64 bytes);
  99int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
 100                             struct btrfs_root *root,
 101                             struct btrfs_block_group_cache *block_group,
 102                             struct btrfs_free_cluster *cluster,
 103                             u64 offset, u64 bytes, u64 empty_size);
 104void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
 105u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
 106                             struct btrfs_free_cluster *cluster, u64 bytes,
 107                             u64 min_start);
 108int btrfs_return_cluster_to_free_space(
 109                               struct btrfs_block_group_cache *block_group,
 110                               struct btrfs_free_cluster *cluster);
 111int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
 112                           u64 *trimmed, u64 start, u64 end, u64 minlen);
 113#endif
 114
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