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Diffstat (limited to 'fs/btrfs/free-space-cache.h')
| -rw-r--r-- | fs/btrfs/free-space-cache.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h new file mode 100644 index 000000000..e3d5e0ad8 --- /dev/null +++ b/fs/btrfs/free-space-cache.h @@ -0,0 +1,158 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2009 Oracle. All rights reserved. + */ + +#ifndef BTRFS_FREE_SPACE_CACHE_H +#define BTRFS_FREE_SPACE_CACHE_H + +/* + * 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 { + BTRFS_TRIM_STATE_UNTRIMMED, + BTRFS_TRIM_STATE_TRIMMED, + BTRFS_TRIM_STATE_TRIMMING, +}; + +struct btrfs_free_space { + struct rb_node offset_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); +} + +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; + s32 discardable_extents[BTRFS_STAT_NR_ENTRIES]; + s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES]; + 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 { + 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; + unsigned check_crcs:1; +}; + +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_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info, + struct btrfs_block_rsv *rsv); +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); +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 *block_group); +int __btrfs_add_free_space(struct btrfs_fs_info *fs_info, + struct btrfs_free_space_ctl *ctl, + u64 bytenr, u64 size, + enum btrfs_trim_state trim_state); +int btrfs_add_free_space(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_free_space_ctl *ctl); +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); +u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root); +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); + +/* Support functions for running our sanity tests */ +#ifdef CONFIG_BTRFS_FS_RUN_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); +#endif + +#endif |