On Thursday 27 April 2006 06:04, Eric Warnke wrote:
> SOLUTION!!!!
I haven't found the FIBMAP doc, but are you really sure that this will permit
a program to properly read it. I say that because I pointed filefrag at a
non-sparse file, and it seems to report a discontinuity. Perhaps the
underlying ioctl() gives the information a user program needs, but filefrag
seems to report fragmentations rather than "holes" in the file.
>
> Turns out there is a way to not only identify sparse files, but also read
> the map as root!
>
> FIBMAP ioctl will do the job quite nicely and there is even a utility to
> read it ( as root ) filefrag -v <filename>
>
> This sure as heck beats scanning the file for zeros manually!
>
> Cheers,
> Eric
>
> On 4/26/06, Scott Ruckh <[EMAIL PROTECTED]> wrote:
> > This is what you said Eric Warnke
> >
> > > Unfortunately I have looked high and low, there is just no good way to
> > > read
> > > sparse files intelligently. Whoever though of providing the
> >
> > functionality
> >
> > > without an API to step through the block mapping was a moron. It is
> >
> > truly
> >
> > > a
> > > brain dead technology. At least there is a fcntl under Win32 to deal
> >
> > with
> >
> > > it with some intelligence.
> > >
> > > Cheers,
> > > Eric
> > >
> > > On 4/26/06, Bill Moran <[EMAIL PROTECTED]> wrote:
> > >> "Scott Ruckh" <[EMAIL PROTECTED]> wrote:
> > >> > This is what you said Eric Warnke
> > >> >
> > >> > > Oops tar -Scf lowercase s is somthing else.
> > >> > >
> > >> > > Cheers,
> > >> > > Eric
> > >> >
> > >> > Good idea.
> > >> >
> > >> > I tried:
> > >> > tar -Sc -f /var/log/lastlog.tar /var/log/lastlog
> > >> >
> > >> > But it appears to do much the same as bacula. It too must read
> > >>
> > >> through
> > >>
> > >> > the entire file, so it does not speed things up.
> > >>
> > >> The only program I'm aware of that will back up sparse files
> >
> > efficiently
> >
> > >> is dump. But dump isn't cross-platform - not even a little.
> >
> > I want to thank everyone for their help.
> >
> > I am not even sure why this file is created this way, seems like a
> > strange implementation from someone on the outside looking in.
> >
> > I will just learn to deal with /var/log/lastlog until something better
> > come up.
> >
> > Thanks.
> > Scott
--
Best regards,
Kern
(">
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