linux-ext4 - Re: [PATCH, RFC] ext4: add EXT4_IOC_ALLOC_DA

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Message-ID: <20090224131649.GB1362@mit.edu>
Date:	Tue, 24 Feb 2009 08:16:49 -0500
From:	Theodore Tso <tytso@....edu>
To:	Andreas Dilger <adilger@....com>
Cc:	linux-ext4@...r.kernel.org, aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [PATCH, RFC] ext4: add EXT4_IOC_ALLOC_DA_BLKS ioctl

On Tue, Feb 24, 2009 at 03:11:05AM -0700, Andreas Dilger wrote:
> On Feb 24, 2009  00:05 -0500, Theodore Ts'o wrote:
> > +#define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 10)
> >   /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
> 
> Please don't use ioctl number 10 - it was used by an early
> version of the FIEMAP ioctl that we still have in use in Lustre
> filesystems.  Not that there is much chance of a collision, but
> it is also easily enough avoided.

Ok, I'll also add a note that ioctl number 10 should be reserved.

    	      	    	      	    	   - Ted
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