linux-kernel - Re: [PATCH 5 of 11] XFS: Use SEEK_{SET, CUR, END} instead of hardcoded values

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Date:	Mon, 18 Sep 2006 13:34:31 +1000
From:	David Chinner <dgc@....com>
To:	"Josef 'Jeff' Sipek" <jeffpc@...efsipek.net>
Cc:	linux-kernel@...r.kernel.org, xfs-masters@....sgi.com,
	akpm@...l.org, dhowells@...hat.com
Subject: Re: [PATCH 5 of 11] XFS: Use SEEK_{SET, CUR, END} instead of hardcoded values

On Sat, Sep 16, 2006 at 09:09:31PM -0400, Josef 'Jeff' Sipek wrote:
> XFS: Use SEEK_{SET,CUR,END} instead of hardcoded values

The hard coded values  used in xfs_change_file_space() are documented as part
of the API to the userspace functions that use this interface in xfsctl(3).
That is:

  XFS_IOC_FREESP
  XFS_IOC_FREESP64
  XFS_IOC_ALLOCSP
  XFS_IOC_ALLOCSP64

  Alter storage space associated with a section of the ordinary file specified.
  The section is specified by a variable of type  xfs_flock64_t,  pointed  to  by
  the  final argument.  The data type xfs_flock64_t contains the following
  members: l_whence is 0, 1, or 2 to indicate that the relative offset l_start
  will be measured from the start  of  the  file,  the current  position, or the
  end of the file, respectively.

Hence I think that the hard coded values should not be changed to something
that is defined outside of XFS's API.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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