Re: overlayfs patches for ovl_copy_up & ovl_rename

[Jordi Pujol <jordipujolp@gmail.com>]

A Dijous 19 Maig 2011 10:49:31, Miklos Szeredi va escriure:
> This file, which modifications are lost, is this on the upper
> filesystem, the lower filesystem or both, before the modification?  And
> after the modification?
> 
> >  or when doing a big
> > upgrade of the system packages, some files are lost.
> 
> How are they lost?  They don't exist when they should?  What's the
> contents of the upper and lower filesystems?

in the sed case, the file exists in the lower filesystem and is copied to tmpfs, 
removed and moved from tmpfs to the original file; several times the same 
operations are done.
in the package upgrade, the file does not exists, it is created on tmpfs and 
moved to the final overlayfs directory; after we can check that it does not 
exist there.

As I thinked previously, the common operation that appears in both processes 
and maybe the cause of the problem is move from another filesystem to 
overlayfs.

Thanks,

Jordi Pujol

Live never ending Tale
GNU/Linux Live forever!
http://livenet.selfip.com