On Mon, Mar 17, 2008 at 06:13:27PM -0700, Zach Brown wrote: > So, I had a fun time throwing together a utility last weekend. I > thought I'd share it sooner rather than later. > > I found myself wanting to backup a copy of an ancient ~75g ext3 file > system. I got frustrated by of our utilities which don't saturate > storage. I wanted dd line rates but I also only wanted to copy > referenced data. > > So I threw something together which does that. I made it work roughly > like tar so that people have some idea what to expect. So you can do > something like: > > $ bdar -cf - /dev/sda3 | gzip -c > /tmp/sda3-backup.bdar.gz > ... > $ zcat /tmp/sda3-backup.bdar.gz | bdar -xf - /dev/sda3 > > and it will do exactly what you would guess it would do after reading > those command lines. > > The bdar file format is just a header and then a series of regions of > bytes described by their length and offset. To create a bdar file from > a file system bdar needs to know enough to figure out what extents are > referenced. Restoring a bdar is generic, though, it just stamps bytes > into the target file. Neat, Zach. You should look at xfs_copy - it does pretty much this for XFS filesystems.... Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
