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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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