Re: [PATCH 1/2] BDI: Provide backing device capability information

[Miklos Szeredi]

> The attached patch replaces backing_dev_info::memory_backed with
> capabilitied bitmap. The capabilities available include:

Wouldn't it be better to reverse the meaning of BDI_CAP_ACCOUNT_DIRTY
and BDI_CAP_WRITEBACK_DIRTY (BDI_CAP_NO_ACCOUNT_DIRTY...)?  That way
out of tree filesystems that implicitly zero bdi->memory_backed
wouldn't _silently_ break.  E.g. fuse does this, though it would not
actually break since it doesn't dirty any pages currently.  I have no
idea whether there are other filesystems that are affected.

Miklos
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