linux-ext4 - Re: [PATCH -V2 3/5] ext4: Fix the race between read_block_bitmap and mark_diskspace

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Date:	Fri, 21 Nov 2008 11:22:04 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	cmm@...ibm.com, tytso@....edu, linux-ext4@...r.kernel.org
Subject: Re: [PATCH -V2 3/5] ext4: Fix the race between read_block_bitmap
 and mark_diskspace_used

Aneesh Kumar K.V wrote:
> We need to make sure we update the block bitmap and clear
> EXT4_BG_BLOCK_UNINIT flag with sb_bgl_lock held. We look
> at EXT4_BG_BLOCK_UNINIT and reinit the block bitmap each
> time in ext4_read_block_bitmap (introduced by
> c806e68f5647109350ec546fee5b526962970fd2 )

Can you add details about the failure mode(s) of this race, so people
(i.e. me) have an idea which bugs they've seen that it might address?

Thanks,
-Eric
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