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