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 /*
  10  * This is the trim state of an extent or bitmap.
  11  *
  12  * BTRFS_TRIM_STATE_TRIMMING is special and used to maintain the state of a
  13  * bitmap as we may need several trims to fully trim a single bitmap entry.
  14  * This is reset should any free space other than trimmed space be added to the
  15  * bitmap.
  16  */
  17 enum btrfs_trim_state {
  18         BTRFS_TRIM_STATE_UNTRIMMED,
  19         BTRFS_TRIM_STATE_TRIMMED,
  20         BTRFS_TRIM_STATE_TRIMMING,
  21 };
  22
  23 struct btrfs_free_space {
  24         struct rb_node offset_index;
  25         u64 offset;
  26         u64 bytes;
  27         u64 max_extent_size;
  28         unsigned long *bitmap;
  29         struct list_head list;
  30         enum btrfs_trim_state trim_state;
  31         s32 bitmap_extents;
  32 };
  33
  34 static inline bool btrfs_free_space_trimmed(struct btrfs_free_space *info)
  35 {
  36         return (info->trim_state == BTRFS_TRIM_STATE_TRIMMED);
  37 }
  38
  39 static inline bool btrfs_free_space_trimming_bitmap(
  40                                             struct btrfs_free_space *info)
  41 {
  42         return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING);
  43 }
  44
  45 struct btrfs_free_space_ctl {
  46         spinlock_t tree_lock;
  47         struct rb_root free_space_offset;
  48         u64 free_space;
  49         int extents_thresh;
  50         int free_extents;
  51         int total_bitmaps;
  52         int unit;
  53         u64 start;
  54         s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
  55         s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
  56         const struct btrfs_free_space_op *op;
  57         void *private;
  58         struct mutex cache_writeout_mutex;
  59         struct list_head trimming_ranges;
  60 };
  61
  62 struct btrfs_free_space_op {
  63         void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
  64         bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
  65                            struct btrfs_free_space *info);
  66 };
  67
  68 struct btrfs_io_ctl {
  69         void *cur, *orig;
  70         struct page *page;
  71         struct page **pages;
  72         struct btrfs_fs_info *fs_info;
  73         struct inode *inode;
  74         unsigned long size;
  75         int index;
  76         int num_pages;
  77         int entries;
  78         int bitmaps;
  79         unsigned check_crcs:1;
  80 };
  81
  82 struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,
  83                 struct btrfs_path *path);
  84 int create_free_space_inode(struct btrfs_trans_handle *trans,
  85                             struct btrfs_block_group *block_group,
  86                             struct btrfs_path *path);
  87
  88 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
  89                                        struct btrfs_block_rsv *rsv);
  90 int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
  91                                     struct btrfs_block_group *block_group,
  92                                     struct inode *inode);
  93 int load_free_space_cache(struct btrfs_block_group *block_group);
  94 int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
  95                         struct btrfs_block_group *block_group,
  96                         struct btrfs_path *path);
  97 int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
  98                           struct btrfs_block_group *block_group,
  99                           struct btrfs_path *path);
 100 struct inode *lookup_free_ino_inode(struct btrfs_root *root,
 101                                     struct btrfs_path *path);
 102 int create_free_ino_inode(struct btrfs_root *root,
 103                           struct btrfs_trans_handle *trans,
 104                           struct btrfs_path *path);
 105 int load_free_ino_cache(struct btrfs_fs_info *fs_info,
 106                         struct btrfs_root *root);
 107 int btrfs_write_out_ino_cache(struct btrfs_root *root,
 108                               struct btrfs_trans_handle *trans,
 109                               struct btrfs_path *path,
 110                               struct inode *inode);
 111
 112 void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group);
 113 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
 114                            struct btrfs_free_space_ctl *ctl,
 115                            u64 bytenr, u64 size,
 116                            enum btrfs_trim_state trim_state);
 117 int btrfs_add_free_space(struct btrfs_block_group *block_group,
 118                          u64 bytenr, u64 size);
 119 int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group,
 120                                        u64 bytenr, u64 size);
 121 int btrfs_remove_free_space(struct btrfs_block_group *block_group,
 122                             u64 bytenr, u64 size);
 123 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
 124 void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group);
 125 bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group);
 126 u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
 127                                u64 offset, u64 bytes, u64 empty_size,
 128                                u64 *max_extent_size);
 129 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
 130 void btrfs_dump_free_space(struct btrfs_block_group *block_group,
 131                            u64 bytes);
 132 int btrfs_find_space_cluster(struct btrfs_block_group *block_group,
 133                              struct btrfs_free_cluster *cluster,
 134                              u64 offset, u64 bytes, u64 empty_size);
 135 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
 136 u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group,
 137                              struct btrfs_free_cluster *cluster, u64 bytes,
 138                              u64 min_start, u64 *max_extent_size);
 139 int btrfs_return_cluster_to_free_space(
 140                                struct btrfs_block_group *block_group,
 141                                struct btrfs_free_cluster *cluster);
 142 int btrfs_trim_block_group(struct btrfs_block_group *block_group,
 143                            u64 *trimmed, u64 start, u64 end, u64 minlen);
 144 int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group,
 145                                    u64 *trimmed, u64 start, u64 end, u64 minlen,
 146                                    bool async);
 147 int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
 148                                    u64 *trimmed, u64 start, u64 end, u64 minlen,
 149                                    u64 maxlen, bool async);
 150
 151 /* Support functions for running our sanity tests */
 152 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 153 int test_add_free_space_entry(struct btrfs_block_group *cache,
 154                               u64 offset, u64 bytes, bool bitmap);
 155 int test_check_exists(struct btrfs_block_group *cache, u64 offset, u64 bytes);
 156 #endif
 157
 158 #endif