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
123