diff options
Diffstat (limited to 'fs/btrfs/ref-cache.h')
| -rw-r--r-- | fs/btrfs/ref-cache.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/fs/btrfs/ref-cache.h b/fs/btrfs/ref-cache.h new file mode 100644 index 00000000..24f7001f --- /dev/null +++ b/fs/btrfs/ref-cache.h @@ -0,0 +1,52 @@ +/* + * Copyright (C) 2008 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ +#ifndef __REFCACHE__ +#define __REFCACHE__ + +struct btrfs_extent_info { + /* bytenr and num_bytes find the extent in the extent allocation tree */ + u64 bytenr; + u64 num_bytes; + + /* objectid and offset find the back reference for the file */ + u64 objectid; + u64 offset; +}; + +struct btrfs_leaf_ref { + struct rb_node rb_node; + struct btrfs_leaf_ref_tree *tree; + int in_tree; + atomic_t usage; + + u64 root_gen; + u64 bytenr; + u64 owner; + u64 generation; + int nritems; + + struct list_head list; + struct btrfs_extent_info extents[]; +}; + +static inline size_t btrfs_leaf_ref_size(int nr_extents) +{ + return sizeof(struct btrfs_leaf_ref) + + sizeof(struct btrfs_extent_info) * nr_extents; +} +#endif |