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017e5369eb
This changes the reference cache to make a single cache per root instead of one cache per transaction, and to key by the byte number of the disk block instead of the keys inside. This makes it much less likely to have cache misses if a snapshot or something has an extra reference on a higher node or a leaf while the first transaction that added the leaf into the cache is dropping. Some throttling is added to functions that free blocks heavily so they wait for old transactions to drop. Signed-off-by: Chris Mason <chris.mason@oracle.com>
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
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* Copyright (C) 2008 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 __REFCACHE__
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#define __REFCACHE__
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struct btrfs_extent_info {
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u64 bytenr;
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u64 num_bytes;
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u64 objectid;
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u64 offset;
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};
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struct btrfs_leaf_ref {
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struct rb_node rb_node;
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int in_tree;
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atomic_t usage;
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u64 bytenr;
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u64 owner;
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u64 generation;
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int nritems;
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struct list_head list;
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struct btrfs_extent_info extents[];
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};
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static inline size_t btrfs_leaf_ref_size(int nr_extents)
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{
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return sizeof(struct btrfs_leaf_ref) +
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sizeof(struct btrfs_extent_info) * nr_extents;
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}
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static inline void btrfs_leaf_ref_tree_init(struct btrfs_leaf_ref_tree *tree)
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{
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tree->root.rb_node = NULL;
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tree->last = NULL;
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INIT_LIST_HEAD(&tree->list);
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spin_lock_init(&tree->lock);
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}
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static inline int btrfs_leaf_ref_tree_empty(struct btrfs_leaf_ref_tree *tree)
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{
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return RB_EMPTY_ROOT(&tree->root);
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}
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void btrfs_leaf_ref_tree_init(struct btrfs_leaf_ref_tree *tree);
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struct btrfs_leaf_ref *btrfs_alloc_leaf_ref(int nr_extents);
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void btrfs_free_leaf_ref(struct btrfs_leaf_ref *ref);
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struct btrfs_leaf_ref *btrfs_lookup_leaf_ref(struct btrfs_root *root,
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u64 bytenr);
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int btrfs_add_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
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int btrfs_remove_leaf_refs(struct btrfs_root *root);
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int btrfs_remove_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
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#endif
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