linux-ext4 - Re: [RFC] ext3 freeze feature

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Message-ID: <20080126191041.GA5233@lst.de>
Date:	Sat, 26 Jan 2008 20:10:41 +0100
From:	Christoph Hellwig <hch@....de>
To:	Takashi Sato <t-sato@...jp.nec.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>
Subject: Re: [RFC] ext3 freeze feature

On Fri, Jan 25, 2008 at 09:42:30PM +0900, Takashi Sato wrote:
> Hi,
> 
> >I am also wondering whether we should have system call(s) for these:
> >
> >On Jan 25, 2008 12:59 PM, Takashi Sato <t-sato@...jp.nec.com> wrote:
> >>+       case EXT3_IOC_FREEZE: {
> >
> >>+       case EXT3_IOC_THAW: {
> >
> >And just convert XFS to use them too?
> 
> I think it is reasonable to implement it as the generic system call, as you 
> said.
> Does XFS folks think so?

Given that XFS has implemented the ioctls for such a long time it might
make more sense to simply move the ioctl implementation to fs/ioctl.c
so it applies to all filesystem.  No need to add a new syscall when the
equivalent-functionality ioctls have to be supported forever anyway.
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