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         u64 max_extent_size;
  27         unsigned long *bitmap;
  28         struct list_head list;
  29 };
  30
  31 struct btrfs_free_space_ctl {
  32         spinlock_t tree_lock;
  33         struct rb_root free_space_offset;
  34         u64 free_space;
  35         int extents_thresh;
  36         int free_extents;
  37         int total_bitmaps;
  38         int unit;
  39         u64 start;
  40         const struct btrfs_free_space_op *op;
  41         void *private;
  42         struct mutex cache_writeout_mutex;
  43         struct list_head trimming_ranges;
  44 };
  45
  46 struct btrfs_free_space_op {
  47         void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
  48         bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
  49                            struct btrfs_free_space *info);
  50 };
  51
  52 struct btrfs_io_ctl;
  53
  54 struct inode *lookup_free_space_inode(struct btrfs_root *root,
  55                                       struct btrfs_block_group_cache
  56                                       *block_group, struct btrfs_path *path);
  57 int create_free_space_inode(struct btrfs_root *root,
  58                             struct btrfs_trans_handle *trans,
  59                             struct btrfs_block_group_cache *block_group,
  60                             struct btrfs_path *path);
  61
  62 int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
  63                                        struct btrfs_block_rsv *rsv);
  64 int btrfs_truncate_free_space_cache(struct btrfs_root *root,
  65                                     struct btrfs_trans_handle *trans,
  66                                     struct btrfs_block_group_cache *block_group,
  67                                     struct inode *inode);
  68 int load_free_space_cache(struct btrfs_fs_info *fs_info,
  69                           struct btrfs_block_group_cache *block_group);
  70 int btrfs_wait_cache_io(struct btrfs_root *root,
  71                         struct btrfs_trans_handle *trans,
  72                         struct btrfs_block_group_cache *block_group,
  73                         struct btrfs_io_ctl *io_ctl,
  74                         struct btrfs_path *path, u64 offset);
  75 int btrfs_write_out_cache(struct btrfs_root *root,
  76                           struct btrfs_trans_handle *trans,
  77                           struct btrfs_block_group_cache *block_group,
  78                           struct btrfs_path *path);
  79 struct inode *lookup_free_ino_inode(struct btrfs_root *root,
  80                                     struct btrfs_path *path);
  81 int create_free_ino_inode(struct btrfs_root *root,
  82                           struct btrfs_trans_handle *trans,
  83                           struct btrfs_path *path);
  84 int load_free_ino_cache(struct btrfs_fs_info *fs_info,
  85                         struct btrfs_root *root);
  86 int btrfs_write_out_ino_cache(struct btrfs_root *root,
  87                               struct btrfs_trans_handle *trans,
  88                               struct btrfs_path *path,
  89                               struct inode *inode);
  90
  91 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
  92 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
  93                            struct btrfs_free_space_ctl *ctl,
  94                            u64 bytenr, u64 size);
  95 static inline int
  96 btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
  97                      u64 bytenr, u64 size)
  98 {
  99         return __btrfs_add_free_space(block_group->fs_info,
 100                                       block_group->free_space_ctl,
 101                                       bytenr, size);
 102 }
 103 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
 104                             u64 bytenr, u64 size);
 105 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
 106 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
 107                                      *block_group);
 108 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
 109                                u64 offset, u64 bytes, u64 empty_size,
 110                                u64 *max_extent_size);
 111 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
 112 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
 113                            u64 bytes);
 114 int btrfs_find_space_cluster(struct btrfs_root *root,
 115                              struct btrfs_block_group_cache *block_group,
 116                              struct btrfs_free_cluster *cluster,
 117                              u64 offset, u64 bytes, u64 empty_size);
 118 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
 119 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
 120                              struct btrfs_free_cluster *cluster, u64 bytes,
 121                              u64 min_start, u64 *max_extent_size);
 122 int btrfs_return_cluster_to_free_space(
 123                                struct btrfs_block_group_cache *block_group,
 124                                struct btrfs_free_cluster *cluster);
 125 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
 126                            u64 *trimmed, u64 start, u64 end, u64 minlen);
 127
 128 /* Support functions for running our sanity tests */
 129 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 130 int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
 131                               u64 offset, u64 bytes, bool bitmap);
 132 int test_check_exists(struct btrfs_block_group_cache *cache,
 133                       u64 offset, u64 bytes);
 134 #endif
 135
 136 #endif