153 lines
5.2 KiB
C
153 lines
5.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2009 Oracle. All rights reserved.
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*/
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#ifndef BTRFS_FREE_SPACE_CACHE_H
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#define BTRFS_FREE_SPACE_CACHE_H
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/*
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* This is the trim state of an extent or bitmap.
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*
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* BTRFS_TRIM_STATE_TRIMMING is special and used to maintain the state of a
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* bitmap as we may need several trims to fully trim a single bitmap entry.
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* This is reset should any free space other than trimmed space be added to the
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* bitmap.
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*/
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enum btrfs_trim_state {
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BTRFS_TRIM_STATE_UNTRIMMED,
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BTRFS_TRIM_STATE_TRIMMED,
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BTRFS_TRIM_STATE_TRIMMING,
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};
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struct btrfs_free_space {
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struct rb_node offset_index;
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u64 offset;
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u64 bytes;
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u64 max_extent_size;
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unsigned long *bitmap;
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struct list_head list;
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enum btrfs_trim_state trim_state;
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s32 bitmap_extents;
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};
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static inline bool btrfs_free_space_trimmed(struct btrfs_free_space *info)
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{
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return (info->trim_state == BTRFS_TRIM_STATE_TRIMMED);
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}
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static inline bool btrfs_free_space_trimming_bitmap(
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struct btrfs_free_space *info)
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{
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return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING);
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}
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struct btrfs_free_space_ctl {
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spinlock_t tree_lock;
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struct rb_root free_space_offset;
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u64 free_space;
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int extents_thresh;
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int free_extents;
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int total_bitmaps;
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int unit;
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u64 start;
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s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
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s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
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const struct btrfs_free_space_op *op;
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void *private;
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struct mutex cache_writeout_mutex;
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struct list_head trimming_ranges;
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};
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struct btrfs_free_space_op {
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bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
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struct btrfs_free_space *info);
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};
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struct btrfs_io_ctl {
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void *cur, *orig;
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struct page *page;
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struct page **pages;
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struct btrfs_fs_info *fs_info;
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struct inode *inode;
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unsigned long size;
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int index;
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int num_pages;
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int entries;
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int bitmaps;
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};
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struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,
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struct btrfs_path *path);
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int create_free_space_inode(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path);
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int btrfs_remove_free_space_inode(struct btrfs_trans_handle *trans,
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struct inode *inode,
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struct btrfs_block_group *block_group);
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int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
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struct btrfs_block_rsv *rsv);
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int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct inode *inode);
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int load_free_space_cache(struct btrfs_block_group *block_group);
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int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path);
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int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path);
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void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group,
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struct btrfs_free_space_ctl *ctl);
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int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
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struct btrfs_free_space_ctl *ctl,
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u64 bytenr, u64 size,
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enum btrfs_trim_state trim_state);
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int btrfs_add_free_space(struct btrfs_block_group *block_group,
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u64 bytenr, u64 size);
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int btrfs_add_free_space_unused(struct btrfs_block_group *block_group,
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u64 bytenr, u64 size);
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int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group,
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u64 bytenr, u64 size);
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int btrfs_remove_free_space(struct btrfs_block_group *block_group,
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u64 bytenr, u64 size);
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void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
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void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group);
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bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group);
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u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
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u64 offset, u64 bytes, u64 empty_size,
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u64 *max_extent_size);
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void btrfs_dump_free_space(struct btrfs_block_group *block_group,
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u64 bytes);
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int btrfs_find_space_cluster(struct btrfs_block_group *block_group,
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struct btrfs_free_cluster *cluster,
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u64 offset, u64 bytes, u64 empty_size);
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void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
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u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group,
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struct btrfs_free_cluster *cluster, u64 bytes,
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u64 min_start, u64 *max_extent_size);
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void btrfs_return_cluster_to_free_space(
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struct btrfs_block_group *block_group,
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struct btrfs_free_cluster *cluster);
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int btrfs_trim_block_group(struct btrfs_block_group *block_group,
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u64 *trimmed, u64 start, u64 end, u64 minlen);
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int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group,
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u64 *trimmed, u64 start, u64 end, u64 minlen,
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bool async);
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int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
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u64 *trimmed, u64 start, u64 end, u64 minlen,
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u64 maxlen, bool async);
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bool btrfs_free_space_cache_v1_active(struct btrfs_fs_info *fs_info);
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int btrfs_set_free_space_cache_v1_active(struct btrfs_fs_info *fs_info, bool active);
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/* Support functions for running our sanity tests */
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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int test_add_free_space_entry(struct btrfs_block_group *cache,
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u64 offset, u64 bytes, bool bitmap);
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int test_check_exists(struct btrfs_block_group *cache, u64 offset, u64 bytes);
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#endif
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#endif
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