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Re: [PATCH] xfsprogs: guard fsxattr definition for newer kernels

To: xfs@xxxxxxxxxxx
Subject: Re: [PATCH] xfsprogs: guard fsxattr definition for newer kernels
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 9 Feb 2016 15:27:18 -0600
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20160209211010.GA14668@dastard>
References: <56BA24A9.4090403@xxxxxxxxxx> <20160209195502.GR27429@dastard> <56BA4495.9060304@xxxxxxxxxx> <20160209211010.GA14668@dastard>
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On 2/9/16 3:10 PM, Dave Chinner wrote:
> On Tue, Feb 09, 2016 at 01:57:09PM -0600, Eric Sandeen wrote:
>> On 2/9/16 1:55 PM, Dave Chinner wrote:
>>> On Tue, Feb 09, 2016 at 11:40:57AM -0600, Eric Sandeen wrote:
>>>> After 334e580,
>>>> fs: XFS_IOC_FS[SG]SETXATTR to FS_IOC_FS[SG]ETXATTR promotion
>>>>
>>>> the file include/linux/fs.h now defines struct fsxattr.
>>>>
>>>> It defines FS_IOC_FSGETXATTR as well, so use that to wrap
>>>> our local definition, and skip it if the kernel is providing
>>>> it so that we don't get multiple definitions.
>>>>
>>>> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
>>>> ---
>>>>
>>>> Should the kernel also #define HAVE_FSXATTR to help existing
>>>> xfsprogs-devel installations?
>>>>
>>>> (And what if headers are included in the other order?  Should
>>>> we try to guard on the kernel side or no?)
>>>
>>> I've already sent a patch to fix this - it was with the foreign
>>> filesystem xfs_quota patch....
>>
>> Oh, sorry, spaced it.
>>
>> What do you think of the HAVE_FSXATTR definition in fs.h?
> 
> Which fs.h? The include/linux/fs.h file does not have such
> guards...

If include/linux/fs.h defined HAVE_FSXATTR, a subsequent inclusion
of xfs_fs.h would not redefine the structure, because it is
guarded with that (for irix!)

-Eric
 

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