linux-ext4 - Re: [PATCH 1/1] Extent overlap bugfix in ext4

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Message-ID: <20070104081314.GB5345@amitarora.in.ibm.com>
Date:	Thu, 4 Jan 2007 13:43:14 +0530
From:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Alex Tomas <alex@...sterfs.com>, linux-ext4@...r.kernel.org,
	suparna@...ibm.com
Subject: Re: [PATCH 1/1] Extent overlap bugfix in ext4

On Wed, Jan 03, 2007 at 10:07:01AM -0800, Mingming Cao wrote:
> Alex Tomas wrote:
> >I think that stuff that converts uninitialized blocks
> >to initialized ones should be a separate codepath and
> >shouldn't be done in the insert path. and an insert
> >(basic tree manipulation) should BUG_ON() one tries
> >to add extent with a block which is already covered
> >by the tree.
> >
> >IMHO, get_blocks() should look like:
> >
> >  path = find_path()
> >  if (found extent covers request block(s)) {
> >    if (extent is uninitialized) {
> >      convert();
> >    }
> >  }
> >
> >where
> >   function convert()
> >  {
> >    /* adopt existing extent so that it
> >     * doesn't cover requested blocks */
> >
> >    /* insert head or tail of existing
> >     * extent, if necessary */
> >
> >    /* insert new extent of initialized blocks */
> >  }
> >
> >thanks, Alex
> 
> I was thing about the same thing. The current ext4_ext_get_blocks()
> function becomes very bulky. The code to convert uninitialized blocks to
> initialized ones is pretty selfcontained, and worth the effort to put it
> into a seperate function.

Ok. I will move this code to a new function.

--
Regards,
Amit Arora
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