[deliverable/linux.git] / fs / btrfs / free-space-cache.h

/*
 * Copyright (C) 2009 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef __BTRFS_FREE_SPACE_CACHE
#define __BTRFS_FREE_SPACE_CACHE

struct btrfs_free_space {
	struct rb_node offset_index;
	u64 offset;
	u64 bytes;
	u64 max_extent_size;
	unsigned long *bitmap;
	struct list_head list;
};

struct btrfs_free_space_ctl {
	spinlock_t tree_lock;
	struct rb_root free_space_offset;
	u64 free_space;
	int extents_thresh;
	int free_extents;
	int total_bitmaps;
	int unit;
	u64 start;
	const struct btrfs_free_space_op *op;
	void *private;
	struct mutex cache_writeout_mutex;
	struct list_head trimming_ranges;
};

struct btrfs_free_space_op {
	void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
	bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
			   struct btrfs_free_space *info);
};

struct btrfs_io_ctl;

struct inode *lookup_free_space_inode(struct btrfs_root *root,
				      struct btrfs_block_group_cache
				      *block_group, struct btrfs_path *path);
int create_free_space_inode(struct btrfs_root *root,
			    struct btrfs_trans_handle *trans,
			    struct btrfs_block_group_cache *block_group,
			    struct btrfs_path *path);

int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
				       struct btrfs_block_rsv *rsv);
int btrfs_truncate_free_space_cache(struct btrfs_root *root,
				    struct btrfs_trans_handle *trans,
				    struct btrfs_block_group_cache *block_group,
				    struct inode *inode);
int load_free_space_cache(struct btrfs_fs_info *fs_info,
			  struct btrfs_block_group_cache *block_group);
int btrfs_wait_cache_io(struct btrfs_root *root,
			struct btrfs_trans_handle *trans,
			struct btrfs_block_group_cache *block_group,
			struct btrfs_io_ctl *io_ctl,
			struct btrfs_path *path, u64 offset);
int btrfs_write_out_cache(struct btrfs_root *root,
			  struct btrfs_trans_handle *trans,
			  struct btrfs_block_group_cache *block_group,
			  struct btrfs_path *path);
struct inode *lookup_free_ino_inode(struct btrfs_root *root,
				    struct btrfs_path *path);
int create_free_ino_inode(struct btrfs_root *root,
			  struct btrfs_trans_handle *trans,
			  struct btrfs_path *path);
int load_free_ino_cache(struct btrfs_fs_info *fs_info,
			struct btrfs_root *root);
int btrfs_write_out_ino_cache(struct btrfs_root *root,
			      struct btrfs_trans_handle *trans,
			      struct btrfs_path *path,
			      struct inode *inode);

void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
			   u64 bytenr, u64 size);
static inline int
btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
		     u64 bytenr, u64 size)
{
	return __btrfs_add_free_space(block_group->free_space_ctl,
				      bytenr, size);
}
int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
			    u64 bytenr, u64 size);
void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
				     *block_group);
u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
			       u64 offset, u64 bytes, u64 empty_size,
			       u64 *max_extent_size);
u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
			   u64 bytes);
int btrfs_find_space_cluster(struct btrfs_root *root,
			     struct btrfs_block_group_cache *block_group,
			     struct btrfs_free_cluster *cluster,
			     u64 offset, u64 bytes, u64 empty_size);
void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
			     struct btrfs_free_cluster *cluster, u64 bytes,
			     u64 min_start, u64 *max_extent_size);
int btrfs_return_cluster_to_free_space(
			       struct btrfs_block_group_cache *block_group,
			       struct btrfs_free_cluster *cluster);
int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
			   u64 *trimmed, u64 start, u64 end, u64 minlen);

/* Support functions for runnint our sanity tests */
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
			      u64 offset, u64 bytes, bool bitmap);
int test_check_exists(struct btrfs_block_group_cache *cache,
		      u64 offset, u64 bytes);
#endif

#endif
Commit	Line	Data
fa9c0d79 CM	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
96303081 JB	22	struct btrfs_free_space {
	23	struct rb_node offset_index;
	24	u64 offset;
	25	u64 bytes;
cef40483	26	u64 max_extent_size;
96303081 JB	27	unsigned long *bitmap;
	28	struct list_head list;
	29	};
	30
34d52cb6 LZ	31	struct btrfs_free_space_ctl {
	32	spinlock_t tree_lock;
	33	struct rb_root free_space_offset;
	34	u64 free_space;
	35	int extents_thresh;
	36	int free_extents;
	37	int total_bitmaps;
	38	int unit;
	39	u64 start;
20e5506b	40	const struct btrfs_free_space_op *op;
34d52cb6	41	void *private;
55507ce3 FM	42	struct mutex cache_writeout_mutex;
55507ce3 FM	43	struct list_head trimming_ranges;
34d52cb6 LZ	44	};
	45
	46	struct btrfs_free_space_op {
	47	void (recalc_thresholds)(struct btrfs_free_space_ctl ctl);
	48	bool (use_bitmap)(struct btrfs_free_space_ctl ctl,
	49	struct btrfs_free_space *info);
	50	};
	51
c9dc4c65 CM	52	struct btrfs_io_ctl;
c9dc4c65 CM	53
0af3d00b JB	54	struct inode lookup_free_space_inode(struct btrfs_root root,
	55	struct btrfs_block_group_cache
	56	block_group, struct btrfs_path path);
	57	int create_free_space_inode(struct btrfs_root *root,
	58	struct btrfs_trans_handle *trans,
	59	struct btrfs_block_group_cache *block_group,
	60	struct btrfs_path *path);
0cb59c99	61
7b61cd92 MX	62	int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
7b61cd92 MX	63	struct btrfs_block_rsv *rsv);
0af3d00b JB	64	int btrfs_truncate_free_space_cache(struct btrfs_root *root,
0af3d00b JB	65	struct btrfs_trans_handle *trans,
1bbc621e	66	struct btrfs_block_group_cache *block_group,
0af3d00b	67	struct inode *inode);
9d66e233 JB	68	int load_free_space_cache(struct btrfs_fs_info *fs_info,
9d66e233 JB	69	struct btrfs_block_group_cache *block_group);
c9dc4c65 CM	70	int btrfs_wait_cache_io(struct btrfs_root *root,
	71	struct btrfs_trans_handle *trans,
	72	struct btrfs_block_group_cache *block_group,
	73	struct btrfs_io_ctl *io_ctl,
	74	struct btrfs_path *path, u64 offset);
0cb59c99 JB	75	int btrfs_write_out_cache(struct btrfs_root *root,
	76	struct btrfs_trans_handle *trans,
	77	struct btrfs_block_group_cache *block_group,
	78	struct btrfs_path *path);
82d5902d LZ	79	struct inode lookup_free_ino_inode(struct btrfs_root root,
	80	struct btrfs_path *path);
	81	int create_free_ino_inode(struct btrfs_root *root,
	82	struct btrfs_trans_handle *trans,
	83	struct btrfs_path *path);
	84	int load_free_ino_cache(struct btrfs_fs_info *fs_info,
	85	struct btrfs_root *root);
	86	int btrfs_write_out_ino_cache(struct btrfs_root *root,
	87	struct btrfs_trans_handle *trans,
53645a91 FDBM	88	struct btrfs_path *path,
53645a91 FDBM	89	struct inode *inode);
82d5902d	90
34d52cb6	91	void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
581bb050 LZ	92	int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
	93	u64 bytenr, u64 size);
	94	static inline int
	95	btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
	96	u64 bytenr, u64 size)
	97	{
	98	return __btrfs_add_free_space(block_group->free_space_ctl,
	99	bytenr, size);
	100	}
fa9c0d79 CM	101	int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
fa9c0d79 CM	102	u64 bytenr, u64 size);
581bb050	103	void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
fa9c0d79	104	void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
581bb050	105	*block_group);
fa9c0d79	106	u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
a4820398 MX	107	u64 offset, u64 bytes, u64 empty_size,
a4820398 MX	108	u64 *max_extent_size);
581bb050	109	u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
fa9c0d79 CM	110	void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
fa9c0d79 CM	111	u64 bytes);
00361589	112	int btrfs_find_space_cluster(struct btrfs_root *root,
fa9c0d79 CM	113	struct btrfs_block_group_cache *block_group,
	114	struct btrfs_free_cluster *cluster,
	115	u64 offset, u64 bytes, u64 empty_size);
	116	void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
	117	u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
	118	struct btrfs_free_cluster *cluster, u64 bytes,
a4820398	119	u64 min_start, u64 *max_extent_size);
fa9c0d79 CM	120	int btrfs_return_cluster_to_free_space(
	121	struct btrfs_block_group_cache *block_group,
	122	struct btrfs_free_cluster *cluster);
f7039b1d LD	123	int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
f7039b1d LD	124	u64 *trimmed, u64 start, u64 end, u64 minlen);
74255aa0	125
dc11dd5d JB	126	/* Support functions for runnint our sanity tests */
	127	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	128	int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
	129	u64 offset, u64 bytes, bool bitmap);
	130	int test_check_exists(struct btrfs_block_group_cache *cache,
	131	u64 offset, u64 bytes);
	132	#endif
74255aa0	133
fa9c0d79	134	#endif