Messages in this thread | | | Date | Thu, 20 Sep 2007 16:22:08 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] Ext4: Uninitialized Block Groups |
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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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