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>

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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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408

fs/btrfs/ctree.c

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5

fs/btrfs/ctree.h

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