Re: [GIT PULL] ext4 updates for 3.9

Dave Jones
2013-02-27T19:11:45Z

On Wed, Feb 27, 2013 at 02:04:19PM -0500, Theodore Ts'o wrote:
> On Wed, Feb 27, 2013 at 01:57:55PM -0500, Dave Jones wrote:
> > Building now. Can you confirm that nothing on-disk should be awry ?
> > Or will I need a new fsck to detect what happened ?
> >
>
> Well, it's possible that a read from data file which had blocks
> located above 512GB might have gotten bogus information, or a block
> allocated above 512GB might result in a write to the wrong place on
> disk.
>
> So if you are very cautious, running fsck just to make sure things are
> OK is not a bad idea. But it's likely that the directory sanity
> checks would have caught things quickly, or trying run an executable
> would have caused a seg fault quickly enough. If your system crashed
> very quickly during the boot process, you'll probably be OK.

It had been up a few hours before I hit those checks.

fsck never found anything. I do have another disk (XFS formatted) with
a backup from a week ago. I'll run a --dry-run rsync to see if it
picks up any changes that I don't expect.

Dave