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Date: Mon, 5 Jul 2010 17:46:36 -0600 From: Andreas Dilger <adilger@...ger.ca> To: Eric Sandeen <sandeen@...hat.com> Cc: ext4 development <linux-ext4@...r.kernel.org> Subject: Re: extent counting fun On 2010-07-05, at 13:24, Eric Sandeen wrote: > [root@...t ~]# filefrag -B /mnt/test/file > /mnt/test/file: 34 extents found > [root@...t ~]# filefrag /mnt/test/file > /mnt/test/file: 1058 extents found, perfection would be 1 extent > > Hum, is it 34 or 1058? :) What do the extents look like on disk? Is this just because it is running on a block-mapped file and is skipping a singleton block periodically for indirect blocks, or is there a bug in the way the extents are being reported? > Older filefrag counted contiguous metadata as part of a contiguous > extent... newer filefrag works in fiemap query-only mode by default, > and just takes what fiemap tells it. The inconsistency is weird > though, and led to a Red Hat bug that I'm inclined to NOTABUG... but > do people think this needs to be made any more consistent? > > Should we hack ext3_fiemap() to include the checks for contiguous > metadata? Or was that too shady/clever to start with ...? :) I wouldn't object to having FIEMAP add a flag for metadata blocks. I've always thought it would be useful to be able to query/dump metadata blocks (e.g. indirect/index blocks) and the inode itself. Cheers, Andreas -- 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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