Re: [gentoo-user] mount nfs thru mount system call

Re: [gentoo-user] mount nfs thru mount system call

[Josh Helmer]

On Wednesday 08 March 2006 19:55, c.s.prakash wrote:
> when i mount the nfs through the system call
>
> mount("192.168.0.51:/root", "/mnt/9", "nfs", 0, "rw, async");
>
> it shows an invalid argument. but when i do this thru mount command it
> mounts without any problem

It's been about 4 years since I last had to do that (so no guarantees), but 
If I remember correctly the data argument for NFS is not just a string.  
Instead I believe that you have to do some other magic to encode the data 
correctly.  I would recommend looking at the source code for mount and see 
what happens.

Josh
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Re: [gentoo-user] mount nfs thru mount system call

[Josh Helmer]

On Wednesday 08 March 2006 21:07, Petr Uzel wrote:
> IMHO it's easier to look at 'man 2 mount' :
>
> ...
> Values for the filesystemtype argument supported by the kernel are listed
> in /proc/filesystems (like  "minix",  "ext2", "msdos", "proc", "nfs",
> "iso9660" etc.).

man 2 mount is not going to help.  If you had looked closer you would realize 
that the "data" argument is the last argument not the filesystem type.  The 
man page only says that the data argument is "typically" a comma separated 
string.   I don't believe that is the case with NFS.

Josh
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Re: [gentoo-user] mount nfs thru mount system call

[Josh Helmer]

On Wednesday 08 March 2006 22:04, Darryl Wagoner wrote:
> On 3/8/06, Josh Helmer <joshhelmer@cox.net> wrote:
> > man 2 mount is not going to help.  If you had looked closer you would
> > realize
> > that the "data" argument is the last argument not the filesystem
> > type.  The
> > man page only says that the data argument is "typically" a comma
> > separated string.   I don't believe that is the case with NFS.
>
>  Why not?  I would try something like for data:
>
> rsize=8192,wsize=8192,soft.  Check nfs(5) for details.

OK...  I did some googling... 

Source:  http://www.die.net/doc/linux/man/man8/mount.8.html

"""
Instead of a textual option string, parsed by the kernel, the nfs file system 
expects a binary argument of type struct nfs_mount_data. The program mount 
itself parses the following options of the form `tag=value', and puts them in 
the structure mentioned: rsize=n, wsize=n, timeo=n, retrans=n, acregmin=n, 
acregmax=n, acdirmin=n, acdirmax=n, actimeo=n, retry=n, port=n, mountport=n, 
mounthost=name, mountprog=n, mountvers=n, nfsprog=n, nfsvers=n, namlen=n. The 
option addr=n is accepted but ignored. Also the following Boolean options, 
possibly preceded by no are recognized: bg, fg, soft, hard, intr, posix, cto, 
ac, tcp, udp, lock. For details, see nfs(5). 
"""

I would still recommend looking into the mount source code.  If I remember 
correctly, there is more to it than just creating a struct and populating it.  
I seem to recall that I also had to do something to register the remote 
export with the local machine.   I vaguely remember fighting to have to get 
something to show up in /proc before I could successfully mount a filesystem.

Josh
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[gentoo-user] mount nfs thru mount system call

[c.s.prakash]

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when i mount the nfs through the system call

mount("192.168.0.51:/root", "/mnt/9", "nfs", 0, "rw, async");

it shows an invalid argument. but when i do this thru mount command it
mounts without any problem

--
C.S.Prakash

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Re: [gentoo-user] mount nfs thru mount system call

[Petr Uzel]

> It's been about 4 years since I last had to do that (so no guarantees), but
> If I remember correctly the data argument for NFS is not just a string.
> Instead I believe that you have to do some other magic to encode the data
> correctly.  I would recommend looking at the source code for mount and see
> what happens.

IMHO it's easier to look at 'man 2 mount' :

...
Values for the filesystemtype argument supported by the kernel are listed 
in /proc/filesystems (like  "minix",  "ext2", "msdos", "proc", "nfs", 
"iso9660" etc.).
...

But I also can't help more...

Petr
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Re: [gentoo-user] mount nfs thru mount system call

[DebianTux23]

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*www.wolfspakt.de/spiel.php?id=7358*

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Re: [gentoo-user] mount nfs thru mount system call

[Darryl Wagoner]

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On 3/8/06, Josh Helmer <joshhelmer@cox.net> wrote:
>
>
> man 2 mount is not going to help.  If you had looked closer you would
> realize
> that the "data" argument is the last argument not the filesystem
> type.  The
> man page only says that the data argument is "typically" a comma separated
> string.   I don't believe that is the case with NFS.
>

 Why not?  I would try something like for data:

rsize=8192,wsize=8192,soft.  Check nfs(5) for details.


--
Darryl Wagoner - WA1GON

"Evil triumphs when good men do nothing."  - Edmund Burke [1729-1797]

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[gentoo-user] Good Game??

[wieseltux23]

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www.wolfspakt.de/spiel.php?id=7358









On Wed, 8 Mar 2006 14:37:19 +0000
Josh Helmer <joshhelmer@cox.net> wrote:

> On Wednesday 08 March 2006 21:07, Petr Uzel wrote:
> > IMHO it's easier to look at 'man 2 mount' :
> >
> > ...
> > Values for the filesystemtype argument supported by the kernel are listed
> > in /proc/filesystems (like  "minix",  "ext2", "msdos", "proc", "nfs",
> > "iso9660" etc.).
> 
> man 2 mount is not going to help.  If you had looked closer you would realize 
> that the "data" argument is the last argument not the filesystem type.  The 
> man page only says that the data argument is "typically" a comma separated 
> string.   I don't believe that is the case with NFS.
> 
> Josh
> -- 
> gentoo-user@gentoo.org mailing list
> 

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Re: [gentoo-user] Good Game??

[Heiko Wundram]

Am Mittwoch, 8. März 2006 23:26 schrieb wieseltux23:
> www.wolfspakt.de/spiel.php?id=7358

For all people who haven't looked there yet, this is a crappy german 
advertising game, in which the player gets points for the number of people 
visiting his "site."

So: don't go look there, this has absolutely nothing to do with this thread.

-- 
--- Heiko.

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gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Good Game??

[Michael Sullivan]

On Wed, 2006-03-08 at 23:42 +0100, Heiko Wundram wrote:
> Am Mittwoch, 8. März 2006 23:26 schrieb wieseltux23:
> > www.wolfspakt.de/spiel.php?id=7358
> 
> For all people who haven't looked there yet, this is a crappy german 
> advertising game, in which the player gets points for the number of people 
> visiting his "site."
> 
> So: don't go look there, this has absolutely nothing to do with this thread.
> 
> -- 
> --- Heiko.
> 

Anyway, the site's in German and I haven't gotten around to learning it
yet...

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