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From: KaiGai Kohei <kaigai@ak.jp.nec.com>
To: David Woodhouse <dwmw2@infradead.org>
Cc: linux-mtd@lists.infradead.org, Kaigai Kohei <kaigai@ak.jp.nec.com>
Subject: Re: JFFS2/xattr problems.
Date: Mon, 12 Jun 2006 18:43:46 +0900	[thread overview]
Message-ID: <448D3752.3090605@ak.jp.nec.com> (raw)
In-Reply-To: <1150099418.11159.44.camel@shinybook.infradead.org>

Hi,

> I have an unrelated question.... what is the maximum size of an XATTR?
> Am I right in thinking that it's 64KiB? That's rather large; we won't be
> able to write it in a single node on some flash chips, where the
> eraseblock size is smaller than that. Don't we need to allow multiple
> nodes, to cover the range of an xdatum?

Indeed, the maximum size of an XATTR is limited by eraseblock size.
As it may be smaller than XATTR_SIZE_MAX (=65536), we can't handle
very large xattr in the current implementation.
It was blind spot for me.

But is it actually needed ?
For example, the length of xattr in EXT2 implementation is limited
by block size which is 4096 at most. But nobody (probably) has claimed
yet.

In my opinion, a xattr across multiple nodes isn't neccesary.
What do you think?

Thanks,
-- 
Open Source Software Promotion Center, NEC
KaiGai Kohei <kaigai@ak.jp.nec.com>

  reply	other threads:[~2006-06-12  9:44 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-20 18:41 JFFS2/xattr problems David Woodhouse
2006-05-21  3:22 ` David Woodhouse
2006-05-21 11:24   ` KaiGai Kohei
2006-05-21 11:19 ` KaiGai Kohei
2006-05-21 12:41   ` David Woodhouse
2006-06-12  2:17   ` KaiGai Kohei
2006-06-12  8:03     ` David Woodhouse
2006-06-12  9:43       ` KaiGai Kohei [this message]
2006-06-12  9:53         ` David Woodhouse
2006-06-12 18:06           ` Jörn Engel
2006-06-13 13:36             ` KaiGai Kohei
2006-06-13 14:13               ` Jörn Engel
2006-06-14 21:58                 ` Theodore Tso
2006-06-15 11:47                   ` Jörn Engel
2006-06-15 15:24                     ` Theodore Tso
2006-06-13 13:30           ` KaiGai Kohei
2006-06-24  5:58             ` KaiGai Kohei
2006-06-24 12:44               ` David Woodhouse
2006-06-26 15:45               ` David Woodhouse
2006-06-27  2:43                 ` KaiGai Kohei
2006-06-29  6:02                   ` KaiGai Kohei

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