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Message-Id: <20070920162208.17f96f78.akpm@linux-foundation.org> Date: Thu, 20 Sep 2007 16:22:08 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Avantika Mathur <mathur@...ux.vnet.ibm.com> Cc: linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org, Andreas Dilger <adilger@...sterfs.com>, cmm@...ibm.com Subject: Re: [PATCH] Ext4: Uninitialized Block Groups On Tue, 18 Sep 2007 17:25:31 -0700 Avantika Mathur <mathur@...ux.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. - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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