linux-ext4 - Re: [PATCH 1/3] Implement generic freeze feature

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Message-id: <20080822070958.GU3392@webber.adilger.int>
Date:	Fri, 22 Aug 2008 01:09:58 -0600
From:	Andreas Dilger <adilger@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Takashi Sato <t-sato@...jp.nec.com>, linux-fsdevel@...r.kernel.org,
	dm-devel@...hat.com, viro@...IV.linux.org.uk,
	linux-ext4@...r.kernel.org, xfs@....sgi.com, hch@...radead.org,
	axboe@...nel.dk, mtk.manpages@...glemail.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] Implement generic freeze feature

On Aug 21, 2008  12:58 -0700, Andrew Morton wrote:
> >  #define FIGETBSZ   _IO(0x00,2)	/* get the block size used for bmap */
> > +#define FIFREEZE	_IOWR('X', 119, int)	/* Freeze */
> > +#define FITHAW		_IOWR('X', 120, int)	/* Thaw */
> 
> FIFREEZE is 119, but a few lines above we have
> 
> #define BLKDISCARD _IO(0x12,119)
>
> Should we be using 120 and 121 here?

No, because 'X' != 0x12...  The 'X' is used because this ioctl is compatible
with the XFS implementation of this feature.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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