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

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Date:	Tue, 24 Feb 2009 03:11:05 -0700
From:	Andreas Dilger <adilger@....com>
To:	"Theodore Ts'o" <tytso@....edu>
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 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.

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

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