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Btrfs: add tree modification log functions

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The tree mod log will log modifications made fs-tree nodes. Most
modifications are done by autobalance of the tree. Such changes are recorded
as long as a block entry exists. When released, the log is cleaned.

With the tree modification log, it's possible to reconstruct a consistent
old state of the tree. This is required to do backref walking on a busy
file system.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt
2012-05-16 17:18:50 +02:00
parent f29021b29a
commit bd989ba359
2 changed files with 412 additions and 1 deletions
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5
fs/btrfs/ctree.h
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@@ -3114,4 +3114,9 @@ struct seq_list {
u32 flags;
};
void btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
struct seq_list *elem);
void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
struct seq_list *elem);
#endif