linux-kernel - Re: [PATCH v2 1/5] fat: allocate persistent inode numbers

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Message-ID: <87ehm6p15v.fsf@devron.myhome.or.jp>
Date:	Thu, 13 Sep 2012 21:17:32 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Namjae Jeon <linkinjeon@...il.com>,
	"Steven J. Magnani" <steve@...idescorp.com>,
	Al Viro <viro@...iv.linux.org.uk>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ravishankar N <ravi.n1@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH v2 1/5] fat: allocate persistent inode numbers

"J. Bruce Fields" <bfields@...ldses.org> writes:

>> >> Grepping around... Documentation/sysctl/vm.txt mentions a
>> >> vfs_cache_pressure parameter.
>> >> Yeah. And dirty hack will be possible to adjust sb->s_shrink.batch.
>> > I am worrying if it could lead to OOM condition on embedded
>> > system(short memory(DRAM) and support 3TB HDD disk of big size.)
>> >
>> > Please let me know if any issues or queries.
>> 
>> So, now I think stable inode number may be useful if there are users of
>> it. And I guess those functionality is no collisions with -mm. And I
>> suppose we can add two modes for "nfs" option (e.g. nfs=1 and nfs=2).
>> 
>> If nfs=1, works like current -mm without no limited operations.
>
> Apologies, I haven't been following the conversation carefully: remind
> me what "works like current -mm" means?

Current -mm means the best-effort work only if inode cache is not
evicted.  I.e. if there is no inode cache anymore on server, server
would return ESTALE. So I guess the behavior would not be stable
relatively.

Thanks.

>> If nfs=2, try to make stable FH and limit some operations
>> 
>> (option name doesn't matter here.)
>> 
>> Does this work fine?
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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