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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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