fs/btrfs/free-space-cache.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2009 Oracle.  All rights reserved.
   4  */
   5
   6 #ifndef BTRFS_FREE_SPACE_CACHE_H
   7 #define BTRFS_FREE_SPACE_CACHE_H
   8
   9 struct btrfs_free_space {
  10         struct rb_node offset_index;
  11         u64 offset;
  12         u64 bytes;
  13         u64 max_extent_size;
  14         unsigned long *bitmap;
  15         struct list_head list;
  16 };
  17
  18 struct btrfs_free_space_ctl {
  19         spinlock_t tree_lock;
  20         struct rb_root free_space_offset;
  21         u64 free_space;
  22         int extents_thresh;
  23         int free_extents;
  24         int total_bitmaps;
  25         int unit;
  26         u64 start;
  27         const struct btrfs_free_space_op *op;
  28         void *private;
  29         struct mutex cache_writeout_mutex;
  30         struct list_head trimming_ranges;
  31 };
  32
  33 struct btrfs_free_space_op {
  34         void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
  35         bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
  36                            struct btrfs_free_space *info);
  37 };
  38
  39 struct btrfs_io_ctl;
  40
  41 struct inode *lookup_free_space_inode(struct btrfs_fs_info *fs_info,
  42                                       struct btrfs_block_group_cache
  43                                       *block_group, struct btrfs_path *path);
  44 int create_free_space_inode(struct btrfs_fs_info *fs_info,
  45                             struct btrfs_trans_handle *trans,
  46                             struct btrfs_block_group_cache *block_group,
  47                             struct btrfs_path *path);
  48
  49 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
  50                                        struct btrfs_block_rsv *rsv);
  51 int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
  52                                     struct btrfs_block_group_cache *block_group,
  53                                     struct inode *inode);
  54 int load_free_space_cache(struct btrfs_fs_info *fs_info,
  55                           struct btrfs_block_group_cache *block_group);
  56 int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
  57                         struct btrfs_block_group_cache *block_group,
  58                         struct btrfs_path *path);
  59 int btrfs_write_out_cache(struct btrfs_fs_info *fs_info,
  60                           struct btrfs_trans_handle *trans,
  61                           struct btrfs_block_group_cache *block_group,
  62                           struct btrfs_path *path);
  63 struct inode *lookup_free_ino_inode(struct btrfs_root *root,
  64                                     struct btrfs_path *path);
  65 int create_free_ino_inode(struct btrfs_root *root,
  66                           struct btrfs_trans_handle *trans,
  67                           struct btrfs_path *path);
  68 int load_free_ino_cache(struct btrfs_fs_info *fs_info,
  69                         struct btrfs_root *root);
  70 int btrfs_write_out_ino_cache(struct btrfs_root *root,
  71                               struct btrfs_trans_handle *trans,
  72                               struct btrfs_path *path,
  73                               struct inode *inode);
  74
  75 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
  76 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
  77                            struct btrfs_free_space_ctl *ctl,
  78                            u64 bytenr, u64 size);
  79 static inline int
  80 btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
  81                      u64 bytenr, u64 size)
  82 {
  83         return __btrfs_add_free_space(block_group->fs_info,
  84                                       block_group->free_space_ctl,
  85                                       bytenr, size);
  86 }
  87 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
  88                             u64 bytenr, u64 size);
  89 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
  90 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
  91                                      *block_group);
  92 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
  93                                u64 offset, u64 bytes, u64 empty_size,
  94                                u64 *max_extent_size);
  95 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
  96 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
  97                            u64 bytes);
  98 int btrfs_find_space_cluster(struct btrfs_fs_info *fs_info,
  99                              struct btrfs_block_group_cache *block_group,
 100                              struct btrfs_free_cluster *cluster,
 101                              u64 offset, u64 bytes, u64 empty_size);
 102 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
 103 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
 104                              struct btrfs_free_cluster *cluster, u64 bytes,
 105                              u64 min_start, u64 *max_extent_size);
 106 int btrfs_return_cluster_to_free_space(
 107                                struct btrfs_block_group_cache *block_group,
 108                                struct btrfs_free_cluster *cluster);
 109 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
 110                            u64 *trimmed, u64 start, u64 end, u64 minlen);
 111
 112 /* Support functions for running our sanity tests */
 113 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 114 int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
 115                               u64 offset, u64 bytes, bool bitmap);
 116 int test_check_exists(struct btrfs_block_group_cache *cache,
 117                       u64 offset, u64 bytes);
 118 #endif
 119
 120 #endif