root/fs/btrfs/free-space-cache.h

INCLUDED FROM

   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         void *cur, *orig;
  41         struct page *page;
  42         struct page **pages;
  43         struct btrfs_fs_info *fs_info;
  44         struct inode *inode;
  45         unsigned long size;
  46         int index;
  47         int num_pages;
  48         int entries;
  49         int bitmaps;
  50         unsigned check_crcs:1;
  51 };
  52 
  53 struct inode *lookup_free_space_inode(
  54                 struct btrfs_block_group_cache *block_group,
  55                 struct btrfs_path *path);
  56 int create_free_space_inode(struct btrfs_trans_handle *trans,
  57                             struct btrfs_block_group_cache *block_group,
  58                             struct btrfs_path *path);
  59 
  60 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
  61                                        struct btrfs_block_rsv *rsv);
  62 int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
  63                                     struct btrfs_block_group_cache *block_group,
  64                                     struct inode *inode);
  65 int load_free_space_cache(struct btrfs_block_group_cache *block_group);
  66 int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
  67                         struct btrfs_block_group_cache *block_group,
  68                         struct btrfs_path *path);
  69 int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
  70                           struct btrfs_block_group_cache *block_group,
  71                           struct btrfs_path *path);
  72 struct inode *lookup_free_ino_inode(struct btrfs_root *root,
  73                                     struct btrfs_path *path);
  74 int create_free_ino_inode(struct btrfs_root *root,
  75                           struct btrfs_trans_handle *trans,
  76                           struct btrfs_path *path);
  77 int load_free_ino_cache(struct btrfs_fs_info *fs_info,
  78                         struct btrfs_root *root);
  79 int btrfs_write_out_ino_cache(struct btrfs_root *root,
  80                               struct btrfs_trans_handle *trans,
  81                               struct btrfs_path *path,
  82                               struct inode *inode);
  83 
  84 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
  85 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
  86                            struct btrfs_free_space_ctl *ctl,
  87                            u64 bytenr, u64 size);
  88 int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
  89                          u64 bytenr, u64 size);
  90 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
  91                             u64 bytenr, u64 size);
  92 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
  93 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
  94                                      *block_group);
  95 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
  96                                u64 offset, u64 bytes, u64 empty_size,
  97                                u64 *max_extent_size);
  98 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
  99 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
 100                            u64 bytes);
 101 int btrfs_find_space_cluster(struct btrfs_block_group_cache *block_group,
 102                              struct btrfs_free_cluster *cluster,
 103                              u64 offset, u64 bytes, u64 empty_size);
 104 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
 105 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
 106                              struct btrfs_free_cluster *cluster, u64 bytes,
 107                              u64 min_start, u64 *max_extent_size);
 108 int btrfs_return_cluster_to_free_space(
 109                                struct btrfs_block_group_cache *block_group,
 110                                struct btrfs_free_cluster *cluster);
 111 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
 112                            u64 *trimmed, u64 start, u64 end, u64 minlen);
 113 
 114 /* Support functions for running our sanity tests */
 115 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 116 int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
 117                               u64 offset, u64 bytes, bool bitmap);
 118 int test_check_exists(struct btrfs_block_group_cache *cache,
 119                       u64 offset, u64 bytes);
 120 #endif
 121 
 122 #endif