linux-kernel - Re: [PATCH] fix ext2 allocator overflows above 31 bit blocks

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Message-Id: <1177115236.3778.23.camel@dyn9047017103.beaverton.ibm.com>
Date:	Fri, 20 Apr 2007 17:27:15 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] fix ext2 allocator overflows above 31 bit blocks

On Fri, 2007-04-20 at 18:14 -0500, Eric Sandeen wrote:
> Andreas Dilger wrote:
> > On Apr 20, 2007  12:10 -0500, Eric Sandeen wrote:
> >> If ext3 can do 16T, ext2 probably should be able to as well.
> >> There are still "int" block containers in the block allocation path
> >> that need to be fixed up.
> > 
> > Yeah, but who wants to do 16TB e2fsck on every boot?  I think there
> > needs to be some limits imposed for the sake of usability.
> 
> I figure this is in the fine tradition of "enough rope to hang oneself"
> 
> If you have 16T of filesystem you probably know enough to not hang 
> yourself this way.
> 
> *shrug*
> 
> It's a bug, today.   

They are fixed in mm tree, as part of the patches which backports ext3
block reservation code to ext2. filesystem block numbers are all
ext2_fsblk_t type(i.e. unsigned long)(see ext2_new_blocks()). Maybe need
a round of thorough review to see if anything left, but I think what in
mm tree looks good.

And those patches in mm tree also backports the ext3 best-effort
allocates multiple blocks code (allocate multiple blocks within the
block reservation window as much as possible), FYI.

Mingming

> If we need another change to limit ext2 to 500G or 
> something, fine by me.  :)
> 
> -Eric
> -
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