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SubjectFW: What is the difference between 'login: root' and 'su -' ?
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>>>>correction follows

> Hi,
>
> BTW, /dev/hdc4, is that a regular hard disk partition? I was always used
> to
> create /dev/hda1, /dev/hda5, /dev/hda6 etc. as normal partitions (via
> fdisk).
>
> Is your /dev/hda hard disk drive or some other device?
>
[> ] ^^^^^ of course not /dev/hda but /dev/hdc. Oops: concentration of
blood in my cofein is increasing :)

> Just for my curiosity :)
>
> Regards
> Petr
>
>
> > -----Původní zpráva-----
> > Od: Peter Seiderer [SMTP:Peter.Seiderer@ciselant.de]
> > Odesláno: 8. listopadu 2001 9:47
> > Komu: linux-kernel@vger.kernel.org
> > Kopie: Ville Herva
> > Předmět: Re: What is the difference between 'login: root' and 'su -'
> > ?
> >
> > Hello,
> > in both cases file descriptor 4 is from 'open("/dev/hdc4", O_RDWR) = 4'
> > ....
> > Peter
> >
> > On Thu, Nov 08, 2001 at 08:10:07AM +0200, Ville Herva wrote:
> > > On Wed, Nov 07, 2001 at 11:40:25PM +0100, you [Peter Seiderer]
> claimed:
> > > > Mhhh,
> > > > the strace output from the 'login: root' one (the one which was
> good)
> > > > looks the same till the EFBIG place:
> > > >
> > > > write(1, "\10\10\10\10\10", 5) = 5
> > > > write(1, "16/44", 5) = 5
> > > > _llseek(4, 18446744071562084352, [2147500032], SEEK_SET) = 0
> > > > write(4,
> > "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) =
> > 32768
> > > > _llseek(4, 18446744071562117120, [2147532800], SEEK_SET) = 0
> > > > write(4,
> > "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) =
> > 32768
> > > > _llseek(4, 18446744071562149888, [2147565568], SEEK_SET) = 0
> > > > write(4,
> > "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) =
> > 32768
> > > > _llseek(4, 18446744071562182656, [2147598336], SEEK_SET) = 0
> > > > write(4,
> > "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) =
> > 32768
> > >
> > > Weird. Perhaps strace gets that wrong and the problem is elsewhere.
> > >
> > > Did you make sure that fd 4 is the same _partition_ in both cases
> (using
> > > strace)? The only thing I could imagine exposing 2GB limit is writing
> to
> > a
> > > file.
> > >
> > > > > > zodiak login: seiderer
> > > > > > Password:
> > > > > > seiderer@zodiak:~ > su -
> > > > > > Password:
> > > > > > zodiak:~ #
> > > > > > zodiak:~ # mkfs.ext2 /dev/hdc4
> > > > > > mke2fs 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09
> > > > > > Filesystem label=
> > > > > > OS type: Linux
> > > > > > Block size=4096 (log=2)
> > > > > > Fragment size=4096 (log=2)
> > > > > > 716672 inodes, 1432116 blocks
> > > > > > 71605 blocks (5.00%) reserved for the super user
> > > > > > First data block=0
> > > > > > 44 block groups
> > > > > > 32768 blocks per group, 32768 fragments per group
> > > > > > 16288 inodes per group
> > > > > > Superblock backups stored on blocks:
> > > > > > 32768, 98304, 163840, 229376, 294912, 819200, 884736
> > > > > >
> > > > > > Writing inode tables: 16/44File size limit exceeded
> > > > > >
> > > > > > strace showed that write returned wit EFBIG and the process
> ended
> > with SIGXFSZ:
> > > > > >
> > > > > > write(1, "\10\10\10\10\10", 5) = 5
> > > > > > write(1, "16/44", 5) = 5
> > > > > > _llseek(4, 18446744071562084352, [2147500032], SEEK_SET) = 0
> > > > > > write(4,
> > "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) = -1
> > EFBIG (File too large)
> > > > > > --- SIGXFSZ (File size limit exceeded) ---
> > > > > > +++ killed by SIGXFSZ +++
> > > > >
> > > > > Hmm, 18446744071562084352 = 0xffffffff80004000, 2147500032 =
> > 0x80004000...
> > > > > It looks a tad like llseek's offset_high would have been
> > corrupted...
> > > > > Strange.
> > > > >
> > > > > 1432116 blocks * 4096 bytes/block * 16/44 written =
> 2133071685.81818
> > so
> > > > > 2147500032 looks sane(ish).
> > >
> > > -- v --
> > >
> > > v@iki.fi
> >
> > -
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