Date: Thu, 16 Nov 2000 20:55:22 -0700
From: "Jeff V. Merkey" <jmerkey@vger.timpanogas.org>
To: linux-kernel@vger.kernel.org
Subject: Re: NCPFS not returning Volume Size (???)
Message-ID: <20001116205522.A15544@vger.timpanogas.org>
In-Reply-To: <20001116204029.A15356@vger.timpanogas.org>
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In-Reply-To: <20001116204029.A15356@vger.timpanogas.org>; from jmerkey@vger.timpanogas.org on Thu, Nov 16, 2000 at 08:40:29PM -0700
Sender: linux-kernel-owner@vger.kernel.org

On Thu, Nov 16, 2000 at 08:40:29PM -0700, Jeff V. Merkey wrote:
> Petr,
> 
> NCPFS in 2.2.18-pre21 is not returning volume size via df -h.  I checked
> your code and found this comment:
> 
> static int ncp_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
> {
> 	struct statfs tmp;
> 
> 	/* We cannot say how much disk space is left on a mounted
> 	   NetWare Server, because free space is distributed over
> 	   volumes, and the current user might have disk quotas. So
> 	   free space is not that simple to determine. Our decision
> 	   here is to err conservatively. */
> 
> 	tmp.f_type = NCP_SUPER_MAGIC;
> 	tmp.f_bsize = 512;
> 	tmp.f_blocks = 0;
> 	tmp.f_bfree = 0;
> 	tmp.f_bavail = 0;
> 	tmp.f_files = -1;
> 	tmp.f_ffree = -1;
> 	tmp.f_namelen = 12;
> 	return copy_to_user(buf, &tmp, bufsiz) ? -EFAULT : 0;
> }
> 
> NCP Code
> 
> 2222/17E6   Get Object's Remaining Disk Space
> 
> (I have docs on this one and can send if you need it).
> 
> will return in NetWare sized blocks the space remaining for this 
> user (which will be the user ID used to login).  The fact that quota's 
> are present for a user (user space restriction node -- in NWDIR.H) 
> should be irrelevant, since from the view of a Linux client attached to 
> a NetWare server, this is their assigned storage.
> 
> This NCP also speaks in hardcoded blocksizes of 4096 bytes, so that's 
> the factor for free space for whatever login ID was used to mount 
> the NetWare Volume that can be used in ncpfs_statfs() to return 
> free space.

COrrection.  3.x always reports as 4096 blocks, 4.11 > reports as
4K, 8K, 16K, 32K, and 64K.  I have not checked what NSS is reporting,
but will test tonight.  

Jeff

> 
> I have not gone through your userspace code as of yet, but to make 
> this work, you need the ObjectID for the User Account you used to
> connect to the server in order to make this work.  
> 
> I noticed I could not get free space from my Server with NCPFS with
> df -h, and tracked it down.  Several NetWare customers migrating 
> installations of NetWare to Linux pointed it out when they were 
> moving Oracle databases over to Linux from NetWare.
> 
> I noticed that 2.4 also is not reporting Volume free space.  
> 
> The current NCPFS code, like a lot of Linux code, is structured
> in a manner that's very different from Novell's internal code,
> (the names are shorter for one, which is an improvement).  The 
> way the NCP codes are peeled off is different and not the 
> large case and switch structure employed in NetWare, so it's
> a little hard for me to follow since I am used to NCPs being 
> grouped into case/switch classes.  If you can point me to 
> where 1) the login ID is stored and B) where NCP packet 
> request/reponse headers are constructed, i.e. a skeleton 
> to send/receive the requests I can grab, I'll try to 
> code this for you.
> 
> :-)
> 
> Jeff 
> 
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