From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Sandeen <sandeen@redhat.com>
Subject: Re: [PATCH -V2 3/5] ext4: Fix the race between read_block_bitmap
 and mark_diskspace_used
Date: Fri, 21 Nov 2008 11:22:04 -0600
Message-ID: <4926EE3C.7050207@redhat.com>
References: <1227285875-18011-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1227285875-18011-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1227285875-18011-3-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
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Cc: cmm@us.ibm.com, tytso@mit.edu, linux-ext4@vger.kernel.org
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
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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