34d52cb6c5
So we can re-use the code to cache free inode numbers. The change is quite straightforward. Two new structures are introduced. - struct btrfs_free_space_ctl We move those variables that are used for caching free space from struct btrfs_block_group_cache to this new struct. - struct btrfs_free_space_op We do block group specific work (e.g. calculation of extents threshold) through functions registered in this struct. And then we can remove references to struct btrfs_block_group_cache. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
/*
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* Copyright (C) 2009 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_FREE_SPACE_CACHE
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#define __BTRFS_FREE_SPACE_CACHE
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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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unsigned long *bitmap;
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struct list_head list;
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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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struct btrfs_free_space_op *op;
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void *private;
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};
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struct btrfs_free_space_op {
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void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
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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 inode *lookup_free_space_inode(struct btrfs_root *root,
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struct btrfs_block_group_cache
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*block_group, struct btrfs_path *path);
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int create_free_space_inode(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path);
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int btrfs_truncate_free_space_cache(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_path *path,
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struct inode *inode);
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int load_free_space_cache(struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group);
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int btrfs_write_out_cache(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path);
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void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
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int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
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u64 bytenr, u64 size);
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int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
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u64 bytenr, u64 size);
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void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
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*block_group);
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u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
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u64 offset, u64 bytes, u64 empty_size);
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void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
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u64 bytes);
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int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_block_group_cache *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_cache *block_group,
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struct btrfs_free_cluster *cluster, u64 bytes,
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u64 min_start);
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int btrfs_return_cluster_to_free_space(
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struct btrfs_block_group_cache *block_group,
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struct btrfs_free_cluster *cluster);
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int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
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u64 *trimmed, u64 start, u64 end, u64 minlen);
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#endif
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