[Bug 213507] [msdosfs]: Prevent occasional directory corruption while extending it to another cluster

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213507

--- Comment #20 from Kirk McKusick <mckusick at FreeBSD.org> ---
(In reply to Damjan Jovanovic from comment #19)
You are correct in what the code needs to do. The general areas that are likely
to be problematic are when a write fails and when a file is deleted. For write
failures the UFS strategy is to deallocate and invalidate the block. When a
file is deleted, any of its in-memory data needs to be freed so that it does
not "reappear" if the file once again is written.

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