tree f4d8e4e8d8ee220b448566a08e75bccfb0ca966f
parent 7c01745781177795e39f78b2c2c42c470a13833a
author Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> 1278490794 +0900
committer Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> 1279846932 +0900

nilfs2: add sanity check in nilfs_btree_add_dirty_buffer

According to the report titled "problem with nilfs_cleanerd" from
Łukasz Wójcicki, nilfs_btree_lookup_dirty_buffers or
nilfs_btree_add_dirty_buffer got memory violation during garbage
collection.

This could happen if a level field of given btree node buffer is
incorrect, which is a crucial internal bug.

This inserts a sanity check to figure out the problem.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>