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SubjectRe: [PATCH] Ext4: Uninitialized Block Groups
On Tue, 18 Sep 2007 17:25:31 -0700
Avantika Mathur <mathur@linux.vnet.ibm.com> wrote:

> In pass1 of e2fsck, every inode table in the fileystem is scanned and checked,
> regardless of whether it is in use. This is this the most time consuming part
> of the filesystem check. The unintialized block group feature can greatly
> reduce e2fsck time by eliminating checking of uninitialized inodes.
>
> With this feature, there is a a high water mark of used inodes for each block
> group. Block and inode bitmaps can be uninitialized on disk via a flag in the
> group descriptor to avoid reading or scanning them at e2fsck time. A checksum
> of each group descriptor is used to ensure that corruption in the group
> descriptor's bit flags does not cause incorrect operation.

This needed a few fixups due to conflicts with
ext2-ext3-ext4-add-block-bitmap-validation.patch but they were pretty
straightforward. Please check that the result is OK.


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