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v6.8
  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 */
 17enum btrfs_trim_state {
 18	BTRFS_TRIM_STATE_UNTRIMMED,
 19	BTRFS_TRIM_STATE_TRIMMED,
 20	BTRFS_TRIM_STATE_TRIMMING,
 21};
 22
 23struct btrfs_free_space {
 24	struct rb_node offset_index;
 25	struct rb_node bytes_index;
 26	u64 offset;
 27	u64 bytes;
 28	u64 max_extent_size;
 29	unsigned long *bitmap;
 30	struct list_head list;
 31	enum btrfs_trim_state trim_state;
 32	s32 bitmap_extents;
 33};
 34
 35static inline bool btrfs_free_space_trimmed(struct btrfs_free_space *info)
 36{
 37	return (info->trim_state == BTRFS_TRIM_STATE_TRIMMED);
 38}
 39
 40static inline bool btrfs_free_space_trimming_bitmap(
 41					    struct btrfs_free_space *info)
 42{
 43	return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING);
 44}
 45
 46/*
 47 * Deltas are an effective way to populate global statistics.  Give macro names
 48 * to make it clear what we're doing.  An example is discard_extents in
 49 * btrfs_free_space_ctl.
 50 */
 51enum {
 52	BTRFS_STAT_CURR,
 53	BTRFS_STAT_PREV,
 54	BTRFS_STAT_NR_ENTRIES,
 55};
 56
 57struct btrfs_free_space_ctl {
 58	spinlock_t tree_lock;
 59	struct rb_root free_space_offset;
 60	struct rb_root_cached free_space_bytes;
 61	u64 free_space;
 62	int extents_thresh;
 63	int free_extents;
 64	int total_bitmaps;
 65	int unit;
 66	u64 start;
 67	s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
 68	s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
 69	const struct btrfs_free_space_op *op;
 70	struct btrfs_block_group *block_group;
 71	struct mutex cache_writeout_mutex;
 72	struct list_head trimming_ranges;
 73};
 74
 75struct btrfs_free_space_op {
 
 76	bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
 77			   struct btrfs_free_space *info);
 78};
 79
 80struct btrfs_io_ctl {
 81	void *cur, *orig;
 82	struct page *page;
 83	struct page **pages;
 84	struct btrfs_fs_info *fs_info;
 85	struct inode *inode;
 86	unsigned long size;
 87	int index;
 88	int num_pages;
 89	int entries;
 90	int bitmaps;
 91};
 92
 93int __init btrfs_free_space_init(void);
 94void __cold btrfs_free_space_exit(void);
 95struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,
 96		struct btrfs_path *path);
 97int create_free_space_inode(struct btrfs_trans_handle *trans,
 98			    struct btrfs_block_group *block_group,
 99			    struct btrfs_path *path);
100int btrfs_remove_free_space_inode(struct btrfs_trans_handle *trans,
101				  struct inode *inode,
102				  struct btrfs_block_group *block_group);
103
104int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
105				    struct btrfs_block_group *block_group,
 
106				    struct inode *inode);
107int load_free_space_cache(struct btrfs_block_group *block_group);
108int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
109			struct btrfs_block_group *block_group,
110			struct btrfs_path *path);
111int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
112			  struct btrfs_block_group *block_group,
113			  struct btrfs_path *path);
114
115void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group,
116			       struct btrfs_free_space_ctl *ctl);
117int __btrfs_add_free_space(struct btrfs_block_group *block_group, u64 bytenr,
118			   u64 size, enum btrfs_trim_state trim_state);
119int btrfs_add_free_space(struct btrfs_block_group *block_group,
120			 u64 bytenr, u64 size);
121int btrfs_add_free_space_unused(struct btrfs_block_group *block_group,
122				u64 bytenr, u64 size);
123int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group,
124				       u64 bytenr, u64 size);
125int btrfs_remove_free_space(struct btrfs_block_group *block_group,
 
 
 
 
 
 
 
 
 
 
 
126			    u64 bytenr, u64 size);
127void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group);
128bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group);
129u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
130			       u64 offset, u64 bytes, u64 empty_size,
131			       u64 *max_extent_size);
132void btrfs_dump_free_space(struct btrfs_block_group *block_group,
 
133			   u64 bytes);
134int btrfs_find_space_cluster(struct btrfs_block_group *block_group,
 
 
135			     struct btrfs_free_cluster *cluster,
136			     u64 offset, u64 bytes, u64 empty_size);
137void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
138u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group,
139			     struct btrfs_free_cluster *cluster, u64 bytes,
140			     u64 min_start, u64 *max_extent_size);
141void btrfs_return_cluster_to_free_space(
142			       struct btrfs_block_group *block_group,
143			       struct btrfs_free_cluster *cluster);
144int btrfs_trim_block_group(struct btrfs_block_group *block_group,
145			   u64 *trimmed, u64 start, u64 end, u64 minlen);
146int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group,
147				   u64 *trimmed, u64 start, u64 end, u64 minlen,
148				   bool async);
149int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
150				   u64 *trimmed, u64 start, u64 end, u64 minlen,
151				   u64 maxlen, bool async);
152
153bool btrfs_free_space_cache_v1_active(struct btrfs_fs_info *fs_info);
154int btrfs_set_free_space_cache_v1_active(struct btrfs_fs_info *fs_info, bool active);
155/* Support functions for running our sanity tests */
156#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
157int test_add_free_space_entry(struct btrfs_block_group *cache,
158			      u64 offset, u64 bytes, bool bitmap);
159int test_check_exists(struct btrfs_block_group *cache, u64 offset, u64 bytes);
160#endif
161
162#endif
v3.5.6
 
  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};
 42
 43struct btrfs_free_space_op {
 44	void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
 45	bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
 46			   struct btrfs_free_space *info);
 47};
 48
 49struct inode *lookup_free_space_inode(struct btrfs_root *root,
 50				      struct btrfs_block_group_cache
 51				      *block_group, struct btrfs_path *path);
 52int create_free_space_inode(struct btrfs_root *root,
 53			    struct btrfs_trans_handle *trans,
 54			    struct btrfs_block_group_cache *block_group,
 
 
 
 
 
 
 
 
 
 
 
 
 
 55			    struct btrfs_path *path);
 
 
 
 56
 57int btrfs_truncate_free_space_cache(struct btrfs_root *root,
 58				    struct btrfs_trans_handle *trans,
 59				    struct btrfs_path *path,
 60				    struct inode *inode);
 61int load_free_space_cache(struct btrfs_fs_info *fs_info,
 62			  struct btrfs_block_group_cache *block_group);
 63int btrfs_write_out_cache(struct btrfs_root *root,
 64			  struct btrfs_trans_handle *trans,
 65			  struct btrfs_block_group_cache *block_group,
 
 66			  struct btrfs_path *path);
 67
 68struct inode *lookup_free_ino_inode(struct btrfs_root *root,
 69				    struct btrfs_path *path);
 70int create_free_ino_inode(struct btrfs_root *root,
 71			  struct btrfs_trans_handle *trans,
 72			  struct btrfs_path *path);
 73int load_free_ino_cache(struct btrfs_fs_info *fs_info,
 74			struct btrfs_root *root);
 75int btrfs_write_out_ino_cache(struct btrfs_root *root,
 76			      struct btrfs_trans_handle *trans,
 77			      struct btrfs_path *path);
 78
 79void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
 80int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
 81			   u64 bytenr, u64 size);
 82static inline int
 83btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
 84		     u64 bytenr, u64 size)
 85{
 86	return __btrfs_add_free_space(block_group->free_space_ctl,
 87				      bytenr, size);
 88}
 89int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
 90			    u64 bytenr, u64 size);
 91void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
 92void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
 93				     *block_group);
 94u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
 95			       u64 offset, u64 bytes, u64 empty_size);
 96u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
 97void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
 98			   u64 bytes);
 99int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
100			     struct btrfs_root *root,
101			     struct btrfs_block_group_cache *block_group,
102			     struct btrfs_free_cluster *cluster,
103			     u64 offset, u64 bytes, u64 empty_size);
104void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
105u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
106			     struct btrfs_free_cluster *cluster, u64 bytes,
107			     u64 min_start);
108int btrfs_return_cluster_to_free_space(
109			       struct btrfs_block_group_cache *block_group,
110			       struct btrfs_free_cluster *cluster);
111int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
112			   u64 *trimmed, u64 start, u64 end, u64 minlen);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
113#endif