WAPBL fsync vs v_dirtyblkhd

[Matthias Drochner <M.Drochner%fz-juelich.de@localhost>]

There seems to be something wrong in this area.

Symptom is that ffs_sync gets into an endless loop
(as was already reported) in some cases.
In my case it is a vnd disk (with plain ffs) backed
by a file on WAPBL.
In ffs_sync(), v_dirtyblkhd never gets empty.
If I limit the number of loops I get KASSERTS later
and/or data corruption.

best regards
Matthias




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