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SubjectDirtiable inode bdi default != sb bdi btrfs
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
---[ end trace 8907b335812c497b ]---
------------[ 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 Tainted: G W 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
---[ end trace 8907b335812c497c ]---
[...]
These are only the first two; they keep happening, with several
different processes (it is not only find), but always btrfs (I have /
and /home on btrfs and /boot on ext4). In case it makes any difference,
/dev seems to be on devtmpfs, and everything uses relatime.
There is also the following one which is not on vfs_readdir:

------------[ 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: 1104, comm: mkdir Tainted: G W 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
[<ffffffffa01408c6>] btrfs_setattr+0x210/0x23a [btrfs]
[<ffffffff8112865e>] notify_change+0x1a2/0x29d
[<ffffffff81113794>] sys_fchmod+0xac/0xfd
[<ffffffff811188e2>] ? sys_newfstat+0x2e/0x39
[<ffffffff81009c72>] system_call_fastpath+0x16/0x1b
---[ end trace 8907b335812c498d ]---
--
Cesar Eduardo Barros
cesarb@cesarb.net
cesar.barros@gmail.com


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