Re: [REVIEW] Don't make lazy counters default for mkfs

[Eric Sandeen <sandeen@xxxxxxxxxxx>]

Mark Goodwin wrote:
> 
> Russell Cattelan wrote:
>> Eric Sandeen wrote:
>>> Russell Cattelan wrote:
>>>
>>>
>>>
>>>>> Hmm, that still seems pretty soon to me.  I'd have thought you'd at
>>>>> least want to wait until most of the distributions (esp. SUSE for you
>>>>> guys) have released versions that have kernels sufficiently recent
>>>>> that the default mkfs will work.  Otherwise this will be a recurring
>>>>> problem.
>>>>>
>>>> I don't suppose there is an easy way to query xfs and find out if it
>>>> can support
>>>> the lazy SB option?
>>> I thought about that; xfs *could* stick someting in /proc/fs/xfs with
>>> supported features or somesuch.
> 
> how about /proc/fs/xfs/features
> .. any format suggestions?

maybe just 2 values, with the actual supported features (& features2)
values anded together?  Easy enough to parse in the code.

i.e.

# cat /proc/fs/xfs/features
0xffffffff
0x00000001


?

-Eric