linux-ext4 - Re: [PATCH 3 2/4] Return 32/64-bit dir name hash according to usage type

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Date:	Sat, 20 Aug 2011 00:23:24 -0600
From:	Andreas Dilger <adilger@...mcloud.com>
To:	Ted Ts'o <tytso@....edu>
Cc:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>,
	linux-nfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	bfields@...ldses.org, bernd.schubert@...tmail.fm,
	hch@...radead.org, yong.fan@...mcloud.com,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 3 2/4] Return 32/64-bit dir name hash according to usage type

On 2011-08-19, at 4:29 PM, Ted Ts'o wrote:
> On Tue, Aug 16, 2011 at 01:54:14PM +0200, Bernd Schubert wrote:
>> +static inline int is_32bit_api(void)
>> +{
>> +#ifdef HAVE_IS_COMPAT_TASK
>> +	return is_compat_task();
>> +#else
>> +	return (BITS_PER_LONG == 32);
>> +#endif
> 
> I assume is_compat_task() is coming from another patch?  What is the
> status of that change?

No, is_compat_task() is upstream for most (all?) of the architectures
that support hybrid 32-/64-bit operation.  It is set at 32-bit syscall
entry when running on 64-bit architectures.

The only minor error in this patch (fixed with a new version from Bernd)
is that this should be under CONFIG_COMPAT instead of HAVE_IS_COMPAT_TASK.

> In the case where is_compat_task() is not defined, we can't just test
> based on BITS_PER_LONG == 32, since even on an x86_64 machine, it's
> possible we're running a 32-bit binary in compat mode....

It is definitely available on x86_64.

Cheers, Andreas
--
Andreas Dilger 
Principal Engineer
Whamcloud, Inc.



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