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-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
