blob: 83774bfd7b3bb09119d0258900b0514307e5536b [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
* Copyright (C) 2009 Oracle. All rights reserved.
#include <linux/rbtree.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include "fs.h"
struct inode;
struct page;
struct btrfs_fs_info;
struct btrfs_path;
struct btrfs_trans_handle;
struct btrfs_trim_block_group;
* This is the trim state of an extent or bitmap.
* BTRFS_TRIM_STATE_TRIMMING is special and used to maintain the state of a
* bitmap as we may need several trims to fully trim a single bitmap entry.
* This is reset should any free space other than trimmed space be added to the
* bitmap.
enum btrfs_trim_state {
struct btrfs_free_space {
struct rb_node offset_index;
struct rb_node bytes_index;
u64 offset;
u64 bytes;
u64 max_extent_size;
unsigned long *bitmap;
struct list_head list;
enum btrfs_trim_state trim_state;
s32 bitmap_extents;
static inline bool btrfs_free_space_trimmed(struct btrfs_free_space *info)
return (info->trim_state == BTRFS_TRIM_STATE_TRIMMED);
static inline bool btrfs_free_space_trimming_bitmap(
struct btrfs_free_space *info)
return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING);
* Deltas are an effective way to populate global statistics. Give macro names
* to make it clear what we're doing. An example is discard_extents in
* btrfs_free_space_ctl.
enum {
struct btrfs_free_space_ctl {
spinlock_t tree_lock;
struct rb_root free_space_offset;
struct rb_root_cached free_space_bytes;
u64 free_space;
int extents_thresh;
int free_extents;
int total_bitmaps;
int unit;
u64 start;
s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
const struct btrfs_free_space_op *op;
struct btrfs_block_group *block_group;
struct mutex cache_writeout_mutex;
struct list_head trimming_ranges;
struct btrfs_free_space_op {
bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info);
struct btrfs_io_ctl {
void *cur, *orig;
struct page *page;
struct page **pages;
struct btrfs_fs_info *fs_info;
struct inode *inode;
unsigned long size;
int index;
int num_pages;
int entries;
int bitmaps;
int __init btrfs_free_space_init(void);
void __cold btrfs_free_space_exit(void);
struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,
struct btrfs_path *path);
int create_free_space_inode(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group,
struct btrfs_path *path);
int btrfs_remove_free_space_inode(struct btrfs_trans_handle *trans,
struct inode *inode,
struct btrfs_block_group *block_group);
int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group,
struct inode *inode);
int load_free_space_cache(struct btrfs_block_group *block_group);
int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group,
struct btrfs_path *path);
int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group,
struct btrfs_path *path);
void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group,
struct btrfs_free_space_ctl *ctl);
int btrfs_add_free_space(struct btrfs_block_group *block_group,
u64 bytenr, u64 size);
int btrfs_add_free_space_unused(struct btrfs_block_group *block_group,
u64 bytenr, u64 size);
int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group,
u64 bytenr, u64 size);
int btrfs_remove_free_space(struct btrfs_block_group *block_group,
u64 bytenr, u64 size);
void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group);
bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group);
u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
u64 offset, u64 bytes, u64 empty_size,
u64 *max_extent_size);
void btrfs_dump_free_space(struct btrfs_block_group *block_group,
u64 bytes);
int btrfs_find_space_cluster(struct btrfs_block_group *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 *block_group,
struct btrfs_free_cluster *cluster, u64 bytes,
u64 min_start, u64 *max_extent_size);
void btrfs_return_cluster_to_free_space(
struct btrfs_block_group *block_group,
struct btrfs_free_cluster *cluster);
int btrfs_trim_block_group(struct btrfs_block_group *block_group,
u64 *trimmed, u64 start, u64 end, u64 minlen);
int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group,
u64 *trimmed, u64 start, u64 end, u64 minlen,
bool async);
int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
u64 *trimmed, u64 start, u64 end, u64 minlen,
u64 maxlen, bool async);
bool btrfs_free_space_cache_v1_active(struct btrfs_fs_info *fs_info);
int btrfs_set_free_space_cache_v1_active(struct btrfs_fs_info *fs_info, bool active);
/* Support functions for running our sanity tests */
int test_add_free_space_entry(struct btrfs_block_group *cache,
u64 offset, u64 bytes, bool bitmap);
int test_check_exists(struct btrfs_block_group *cache, u64 offset, u64 bytes);