Re: [Dump-users] restore -C and mount points

[Stelian P. <st...@po...>]

Le vendredi 20 juin 2008 à 17:32 -0700, Kenneth Porter a écrit :
> On Friday, June 06, 2008 2:32 PM -0700 Kenneth Porter 
> <sh...@se...> wrote:
> 
> > It would be desirable if these miscompares were instead reported with a
> > different message to identify the true nature of the miscompare. For
> > example, "<path> masked by mount point <mount point>".
> 
> > (Alas, I don't know which API to use to query a path's filesystem. I use
> > "df <path>" from the command line, so I'd go digging through the df
> > source  for that.)
> 
> It looks like the filesystem is identified by the st_dev member returned by 
> stat(2). stat() is invoked on the root of the compared filesystem at the 
> start of the compare operation, and for each node compared, so in principle 
> one could compare the st_dev of the two before comparing anything else.

This would work if the target file exists, but how to deal with a
missing target file ? (for example, supposed that you dumped /dev/hda,
but when comparing you don't found this file).

What we need when comparing is to find out if a whole path is masked my
a mount point and then stop comparing all the leafs of this path. But
since the comparing is done in the inode number order (not in the
directory / contents order), it's not that simple.

Stelian.
-- 
Stelian Pop <st...@po...>