linux-ext4 - Re: [Ocfs2-devel] [PATCH 1/3] ext3/ext4: Factor out disk addressability check

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Date:	Mon, 16 Aug 2010 09:44:35 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>, Jan Kara <jack@...e.cz>,
	Andreas Dilger <adilger@...ger.ca>, "Ted Ts'o" <tytso@....edu>,
	ocfs2-devel@....oracle.com, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	"linux-kernel@...r.kernel.org Patrick J. LoPresti" 
	<lopresti@...il.com>
Subject: Re: [Ocfs2-devel] [PATCH 1/3] ext3/ext4: Factor out disk addressability
 check

Joel Becker wrote:
> On Sun, Aug 15, 2010 at 10:36:36PM -0500, Eric Sandeen wrote:
>> Er, yeah.  I had 32 bits in my head since that's the case we're
>> checking for... whoops.
>>
>> So I guess your
>>
>>  	    ... ||
>> 	    ((last_fs_block >> (PAGE_CACHE_SHIFT - blocksize_bits)) >
>> 	     (pgoff_t)(!0ULL))) {
>>
>> is right :)  (my feeble brain has a hard time reading that, though, TBH)
> 
> 	Well, note the bug in my quickly typed version: "(!0ULL)" vs
> "(~0ULL)".  

*nod* saw that but figured it was just a typo & didn't mention it ;)

> How about:
> 
> 	u64 last_fs_page = last_fs_block >> (PAGE_CACHE_SHIFT - blocksize_bits);
> 
> 	... ||
> 	(last_fs_page > (pgoff_t)(~0ULL))) {
> 
> Is that more readable?

To me, yes.  Maybe do similar for last_fs_sector.

If it's getting too verbose I understand, but less dense is a lot easier
to read, IMHO.  Just style though, really, so *shrug*

Thanks,
-Eric

> Joel
> 

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