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    Subject[PATCH 0/3] Fix warnings in __mark_inode_dirty
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    Hi,

    patches below fix (some of) warnings in __mark_inode_dirty complaining about
    unregistered BDI (https://bugzilla.kernel.org/show_bug.cgi?id=16312). The
    issue is that device inodes describing non-writeable BDI can still get dirty
    but they would be filed to writeback lists of these non-writeable BDI's.
    Normally, we would just silently throw away the inode modification (bug) but
    some unwriteable BDI's (like the one of /dev/zero) aren't marked as such and so
    the code in __mark_inode_dirty gets upset that writeback isn't properly setup
    although BDI is writeable.
    The solution is slightly hacky but it should be a reasonable short term
    solution until we resolve the principial issue that device inode should be
    written to a different BDI than inode's data. Christoph wrote he has some
    ideas in this direction.

    Honza

    PS: There might be another issue in sd.c code triggering this warning --- BDI
    is registered from async callback (add_disk() called from sd_probe_async())
    which might happen after userspace tries to access the device if I'm right.
    At least this is the only explanation I have for some of the warnings.



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