linux-kernel - Re: [PATCH 3.12 40/56] ext4: fix ext4_discard_allocated_blocks() if we can't allocate the pa struct

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Date:	Mon, 15 Sep 2014 09:40:26 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	stable@...r.kernel.org, linux-kernel@...r.kernel.org,
	Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH 3.12 40/56] ext4: fix ext4_discard_allocated_blocks()
 if we can't allocate the pa struct

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On 09/15/2014, 04:46 AM, Ben Hutchings wrote:
> On Wed, 2014-09-03 at 11:26 +0200, Jiri Slaby wrote:
>> From: Theodore Ts'o <tytso@....edu>
>> 
>> 3.12-stable review patch.  If anyone has any objections, please
>> let me know.
>> 
>> ===============
>> 
>> commit 86f0afd463215fc3e58020493482faa4ac3a4d69 upstream.
>> 
>> If there is a failure while allocating the preallocation
>> structure, a number of blocks can end up getting marked in the
>> in-memory buddy bitmap, and then not getting released.  This can
>> result in the following corruption getting reported by the
>> kernel:
>> 
>> EXT4-fs error (device sda3): ext4_mb_generate_buddy:758: group
>> 1126, 12793 clusters in bitmap, 12729 in gd
>> 
>> In that case, we need to release the blocks using
>> mb_free_blocks().
>> 
>> Tested: fs smoke test; also demonstrated that with injected
>> errors, the file system is no longer getting corrupted
>> 
>> Google-Bug-Id: 16657874
>> 
>> Signed-off-by: "Theodore Ts'o" <tytso@....edu> Signed-off-by:
>> Jiri Slaby <jslaby@...e.cz>
> [...]
> 
> It's a bit late now, but Ted said this introduced a regression
> that's fixed by commit c99d1e6e83b0 ("ext4: fix BUG_ON in
> mb_free_blocks()").

Oh, now queued for 3.12. Thanks!

- -- 
js
suse labs
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