tree 0d80791532d2d022c91f20013003716eaf0afb40
parent 2ac3b6e00acb46406c993d57921f86a594aafe08
author Theodore Ts'o <tytso@mit.edu> 1242589081 -0400
committer Theodore Ts'o <tytso@mit.edu> 1242589081 -0400

ext4: Add a comprehensive block validity check to ext4_get_blocks()

To catch filesystem bugs or corruption which could lead to the
filesystem getting severly damaged, this patch adds a facility for
tracking all of the filesystem metadata blocks by contiguous regions
in a red-black tree.  This allows quick searching of the tree to
locate extents which might overlap with filesystem metadata blocks.

This facility is also used by the multi-block allocator to assure that
it is not allocating blocks out of the system zone, as well as by the
routines used when reading indirect blocks and extents information
from disk to make sure their contents are valid.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>