linux-ext4 - Re: [PATCH][BUG] ext4: dx_map_entry cannot support over 64KB block size

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Message-ID: <4A404CC0.9050202@jp.fujitsu.com>
Date:	Tue, 23 Jun 2009 12:32:16 +0900
From:	Toshiyuki Okajima <toshi.okajima@...fujitsu.com>
To:	Theodore Tso <tytso@....edu>
CC:	Andreas Dilger <adilger@....com>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH][BUG] ext4: dx_map_entry cannot support over 64KB block
 size

Ted-san,

Theodore Tso wrote:
 > Are you aware of any patches that enable an IA64 system to support a
 > page size greater than 64kB?  (And whether any customer would actually
 > want to use them, given the downsides of very large page size?)  The
No, I am not. But I have considered that POWERPC system has been
supported over 64KB page size after I examined all Kconfig's in kernel
source. Therefore I thought this bug should be fixed in kernel side.

 > issue is that Linux doesn't support filesystem block sizes > than the
 > page size.  In any case, I don't mind adding patches that attempt to
 > make it better to support large block sizes; I don't really want to
 > claim that we support it until we can actually fully test for that
I think so, too.

 > feature, though.  Is it your intent to actually try to provide support
 > for this at some point?  I'll help you if you are, but you'll have to
 > do the testing, since I don't have access to an IA64 platform that
 > might be able to support these sorts of large pages.
 >
 > Thanks,
 >
 > 						- Ted
I don't think this feature (over 64KB block size support) to be necessary
immediately. Because I have been investigating ext4 for my customers
in order that I may provide them greater quality and performance but they don't
  want it now.
But when my customers want this feature, I will try to test it.

Best regards,
Toshiyuki Okajima

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