linux-kernel - Re: [PATCH] LogFS take three

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Message-ID: <464CC209.4060500@cs.helsinki.fi>
Date:	Thu, 17 May 2007 23:58:49 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"Jörn Engel" <joern@...ybastard.org>
CC:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, akpm@...l.org,
	Albert Cahalan <acahalan@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Greg KH <greg@...ah.com>, Ingo Oeser <ioe-lkml@...eria.de>
Subject: Re: [PATCH] LogFS take three

Jörn Engel wrote:
> Compressing random data will actually enlarge it.  If that happens I
> simply store the verbatim uncompressed data instead and mark it as such.
> 
> There is also demand for a user-controlled bit in the inode to disable
> compression completely.  All those .jpg, .mpg, .mp3, etc. just waste
> time by trying and failing to compress them.

So any sane way to enable compression is on per-inode basis which makes 
me still wonder why you need per-object compression.
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