linux-kernel - Re: Dirtiable inode bdi default != sb bdi btrfs

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Message-ID: <4C9BAD1E.2030007@fusionio.com>
Date:	Thu, 23 Sep 2010 21:40:14 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Cesar Eduardo Barros <cesarb@...arb.net>,
	<linux-kernel@...r.kernel.org>, Jan Kara <jack@...e.cz>,
	Chris Mason <chris.mason@...cle.com>,
	<linux-btrfs@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	<linux-fsdevel@...r.kernel.org>, <stable@...nel.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: Dirtiable inode bdi default != sb bdi btrfs

On 2010-09-23 21:38, Andrew Morton wrote:
> 
> (Cc stable@...nel.org)
> 
> On Wed, 22 Sep 2010 21:54:30 -0300
> Cesar Eduardo Barros <cesarb@...arb.net> wrote:
> 
>> This started appearing for me on v2.6.36-rc5-49-gc79bd89; it did not 
>> happen on v2.6.36-rc5-33-g1ce1e41, probably because it does not have 
>> commit 692ebd17c2905313fff3c504c249c6a0faad16ec which introduces the 
>> warning.
>>
>> [...]
>> device fsid 44d595920ddedfa-3ece6b56e80f689e devid 1 transid 22342 
>> /dev/mapper/vg_cesarbinspiro-lv_home
>> SELinux: initialized (dev dm-3, type btrfs), uses xattr
>> ------------[ cut here ]------------
>> WARNING: at fs/fs-writeback.c:87 inode_to_bdi+0x62/0x6d()
>> Hardware name: Inspiron N4010
>> Dirtiable inode bdi default != sb bdi btrfs
>> Modules linked in: ipv6 kvm_intel kvm uinput arc4 ecb 
>> snd_hda_codec_intelhdmi snd_hda_codec_realtek iwlagn snd_hda_intel 
>> iwlcore snd_hda_codec uvcvideo snd_hwdep mac80211 videodev snd_seq 
>> snd_seq_device v4l1_compat snd_pcm atl1c v4l2_compat_ioctl32 btusb 
>> cfg80211 snd_timer i2c_i801 bluetooth iTCO_wdt dell_wmi dell_laptop snd 
>> pcspkr wmi dcdbas shpchp iTCO_vendor_support soundcore snd_page_alloc 
>> rfkill joydev microcode btrfs zlib_deflate libcrc32c cryptd aes_x86_64 
>> aes_generic xts gf128mul dm_crypt usb_storage i915 drm_kms_helper drm 
>> i2c_algo_bit i2c_core video output [last unloaded: scsi_wait_scan]
>> Pid: 1073, comm: find Not tainted 2.6.36-rc5+ #8
>> Call Trace:
>>   [<ffffffff8104d0e4>] warn_slowpath_common+0x85/0x9d
>>   [<ffffffff8104d19f>] warn_slowpath_fmt+0x46/0x48
>>   [<ffffffff811308b7>] inode_to_bdi+0x62/0x6d
>>   [<ffffffff81131b48>] __mark_inode_dirty+0xd0/0x177
>>   [<ffffffff81127168>] touch_atime+0x107/0x12a
>>   [<ffffffff81122384>] ? filldir+0x0/0xd0
>>   [<ffffffff8112259b>] vfs_readdir+0x8d/0xb4
>>   [<ffffffff8112270b>] sys_getdents+0x81/0xd1
>>   [<ffffffff81009c72>] system_call_fastpath+0x16/0x1b
> 
> Thanks.  692ebd17c2905313fff3c504c249c6a0faad16ec had a cc:stable in
> the changelog.  I'd suggest it not be merged into -stable until this
> regression is sorted out!

It was just added, I'm discussing this with Chris on irc as I type this.
But yes, lets not replace a regression with a new regression :-). So
Greg, please hold off on these for a little while.

-- 
Jens Axboe

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