DEVEL15-windows-afsd-misc-20080306

DEVEL15-windows-afsd-misc-20080306

LICENSE MIT

(1) an attempt to make better use of bandwidth from the BkgDaemon threads
    by preventing the thread from blocking on a vnode that is already
    storing data in another thread

(2) prevents CM_SCACHEFLAG_ASYNCSTORE from being reset on a write failure.

(3) fixes cm_EvaluateSysName to avoid accessing uninitialized memory

(4) prevents a lock leak if the symlink's mountpointstring is too long.
    (This could never actually happen but better to correct the code.)

(cherry picked from commit 6a631075c478794e998ad67d90e33d304521fbd3)