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Date: Tue, 10 Apr 2007 11:44:51 -0500 From: Matt Mackall <mpm@...enic.com> To: Jörn Engel <joern@...ybastard.org> Cc: Theodore Tso <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>, Phillip Susi <psusi@....rr.com>, Samuel Thibault <samuel.thibault@...-lyon.org>, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: Add a norecovery option to ext3/4? On Tue, Apr 10, 2007 at 02:08:26PM +0200, Jörn Engel wrote: > On Tue, 10 April 2007 07:27:18 -0400, Theodore Tso wrote: > > > > I suppose what you could do is to read in the journal, and use it to > > create an remapping table so that when you want to read block #5126, > > and block number 5126 is in the journal, to read the journal version > > of the block instead of the one on disk. That would allow for safe > > access to a filesystem being mounted read-only without the journal > > being present. > > Another option would be to access the medium through a mapping inode, > replay the journal into the mapping inode and _not_ flush the dirty > pages. But as long as a remapping table is sufficient for ext3 journal > format, such a table should be simpler and faster. Or you could make a snapshot with device-mapper and then mount it. Requires some free disk space somewhere (or a hack with loop on tmpfs), but should be doable today. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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