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Btrfs: add tree modification log functions
authorJan Schmidt <list.btrfs@jan-o-sch.net>
Wed, 16 May 2012 15:18:50 +0000 (17:18 +0200)
committerJan Schmidt <list.btrfs@jan-o-sch.net>
Wed, 30 May 2012 13:17:01 +0000 (15:17 +0200)
commitbd989ba359f2acb8bc5f5490e19010fc0a6f8356
tree3689629e226678802bfe9b8a91ae560ef50a93f0tree | snapshot (tar.gz zip)
parentf29021b29a85701c08afadfd51d87163fb078059commit | diff
Btrfs: add tree modification log functions

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>
fs/btrfs/ctree.c diff | blob | blame | history
fs/btrfs/ctree.h diff | blob | blame | history