K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2005-03-13T11:54:28.000000Z
K 7
svn:log
V 1674
 - Remove vx_lock, vx_unlock, vx_wait, etc.
 - Add a vn_start_write/vn_finished_write around vlrureclaim so we don't do
   writing ops without suspending.  This could suspend the vlruproc which
   should not be a problem under normal circumstances.
 - Manually implement VMIGHTFREE in vlrureclaim as this was the only instance
   where it was used.
 - Acquire a lock before calling vgone() as it now requires it.
 - Move the acquisition of the vnode interlock from vtryrecycle() to
   getnewvnode() so that if it fails we don't drop and reacquire the
   vnode_free_list_mtx.
 - Check for a usecount or holdcount at the end of vtryrecycle() in case
   someone grabbed a ref while we were recycling.  Abort the recycle, and
   on the final ref drop this vnode will be placed on the head of the free
   list.
 - Move the redundant VOP_INACTIVE protection code into the local
   vinactive() routine to avoid code bloat.
 - Keep the vnode lock held across calls to vgone() in several places.
 - vgonel() no longer uses XLOCK, instead callers must hold an exclusive
   vnode lock.  The VI_DOOMED flag is set to allow other threads to detect
   a vnode which is no longer valid.  This flag is set until the last
   reference is gone, and there are no chances for a new ref.  vgonel()
   holds this lock across the entire function, which greatly simplifies
   logic.
 _ Only vfree() in one place in vgone() not three.
 - Adjust vget() to check the VI_DOOMED flag prior to waiting on the lock
   in the LK_NOWAIT case.  In other cases, check after we have slept and
   acquired an exlusive lock.  This will simulate the old vx_wait()
   behavior.

Sponsored by:	Isilon Systems, Inc.

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