linux-ext4 - Re: [RFC][PATCH 00/12] Enhanced file stat system call

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Date:	Thu, 26 Nov 2015 15:06:19 -0700
From:	Andreas Dilger <adilger@...ger.ca>
To:	David Howells <dhowells@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>, arnd@...db.de,
	linux-afs@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [RFC][PATCH 00/12] Enhanced file stat system call

On Nov 26, 2015, at 8:19 AM, David Howells <dhowells@...hat.com> wrote:
> 
> Christoph Hellwig <hch@...radead.org> wrote:
> 
>> from a quick look the statx bits looks fine in general.  I think Ted
>> last time had a problem with the IOC flag allocation, so you might
>> want to ping him.
> 
> Yeah - he commented on that.
> 
>> But fsinfo with the multiplexer and the void pointer is just horrible.
>> What were you thinking there?
> 
> I think the fsinfo data struct probably wants splitting up.

Could we separate the statx() and fsinfo() submissions so that this doesn't
block statx() landing indefinitely?  I think people are generally in support
of statx() as it is today, and it's been _sooo_ long in coming that I'd hate
to see it delayed further.  The statx() syscall definitely has value without
fsinfo() to improve the life of network filesystems.

Cheers, Andreas

>  Now this could be
> done in a number of ways, including:
> 
> (1) By adding multiple syscalls (statfsx, fsinfo, netfsinfo, ...) but each
>     one needs a bit in the kernel to handle the basics (path/fd lookup,
>     security check, buffer allocation and freeing, ...) which could all be in
>     common - hence the mux method.
> 
> (2) Adding an argument to the fsinfo syscall since it has at least one
>     syscall argument spare.
> 
> (3) Offloading some of the bits to standardised xattr calls.  The large
>     string fields (domain name, volume name, ...) would seem to be obvious
>     candidates for this.
> 
> Given that the core VFS gets to manage the contents of the buffer, it
> shouldn't be as controversial as pioctl().
> 
> David
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Cheers, Andreas






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