On Thu, Feb 21, 2013 at 04:40:42PM +1100, Chris Naunton wrote: > I think I'm the victim of a resize2fs bug that was addressed in > 1.42.7: http://e2fsprogs.sourceforge.net/e2fsprogs-release.html#1.42.7 > > My senario: > > * Running Ubuntu 12.10 with the latest x64 e2fsprogs package, which is 1.47.5 > > * I have a 3.6T ext4 filesystem that had been created with the "resize" option: > > mkfs -t ext4 -T ext4 -E stripe-width=64,resize=20T -i 1048576 -L > data -m 0 /dev/raid5/data > > (This was three years ago. I think at the time I assumed if I didn't > specify this option my ability to resize would be limited.) >..... Yup, I think you're correct. You hit the bug which we only discovered and fixed in time for the 1.42.7 release. ;-( Unfortunately, the corruption that happened included wiping out parts of the inode table. This means the data loss is going to be non-trivial, and possibly extremely bad. Sorry. :-( I don't know how big your RAID array is, and how recent was your last backups, but basically, if you can afford to make a disk image copy of the file system, I would recommend doing that first. Then trying running fsck -y on the copy, and see if that allows you to recover all of the data that you really need. If it doesn't, it may be possible to get more data back by doing either (a) using tools that search for critical keywords (i.e., if there is an extremely critical file, say like a Ph.D. thesis for which ten years of work was un backed up), or (b) by using tools that search for file signatures in the data blocks. The tool I recommend for the latter is called PhotoRec: http://www.cgsecurity.org/wiki/PhotoRec It was originally designed to extract digital photos from damaged SD cards, but it now understands hundreds of file formats, including OpenOffice/LibreOffice, zip files, MS Office files, etc.: http://www.cgsecurity.org/wiki/File_Formats_Recovered_By_PhotoRec I'm sorry to have to tell you this, and I'm really sorry you ran across this bug before we had a chance to get it fixed and pushed out to the distributions. Regards, - Ted -- 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
