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
22struct 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
30struct 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
45struct 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
51struct btrfs_io_ctl;
52
53struct inode *lookup_free_space_inode(struct btrfs_root *root,
54				      struct btrfs_block_group_cache
55				      *block_group, struct btrfs_path *path);
56int 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
61int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
62				       struct btrfs_block_rsv *rsv);
63int 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);
67int load_free_space_cache(struct btrfs_fs_info *fs_info,
68			  struct btrfs_block_group_cache *block_group);
69int 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);
74int 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);
78struct inode *lookup_free_ino_inode(struct btrfs_root *root,
79				    struct btrfs_path *path);
80int create_free_ino_inode(struct btrfs_root *root,
81			  struct btrfs_trans_handle *trans,
82			  struct btrfs_path *path);
83int load_free_ino_cache(struct btrfs_fs_info *fs_info,
84			struct btrfs_root *root);
85int 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
90void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
91int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
92			   u64 bytenr, u64 size);
93static inline int
94btrfs_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}
100int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
101			    u64 bytenr, u64 size);
102void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
103void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
104				     *block_group);
105u64 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);
108u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
109void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
110			   u64 bytes);
111int 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);
115void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
116u64 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);
119int btrfs_return_cluster_to_free_space(
120			       struct btrfs_block_group_cache *block_group,
121			       struct btrfs_free_cluster *cluster);
122int 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
127int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
128			      u64 offset, u64 bytes, bool bitmap);
129int test_check_exists(struct btrfs_block_group_cache *cache,
130		      u64 offset, u64 bytes);
131#endif
132
133#endif
134