- Move softdep from using a global worklist to per-mount worklists. This

   has many positive effects including improved smp locking, reducing
   interdependencies between mounts that can lead to deadlocks, etc.
 - Add the softdep worklist and various counters to the ufsmnt structure.
 - Add a mount pointer to the workitem and remove mount pointers from the
   various structures derived from the workitem as they are now redundant.
 - Remove the poor-man's semaphore protecting softdep_process_worklist and
   softdep_flushworklist.  Several threads may now process the list
   simultaneously.
 - Add softdep_waitidle() to block the thread until all pending
   dependencies being operated on by other threads have been flushed.
 - Use softdep_waitidle() in unmount and snapshots to block either
   operation until the fs is stable.
 - Remove softdep worklist processing from the syncer and move it into the
   softdep_flush() thread.  This thread processes all softdep mounts
   once each second and when it is called via the new softdep_speedup()
   when there is a resource shortage.  This removes the softdep hook
   from the kernel and various hacks in header files to support it.

Reviewed by/Discussed with:	tegge, truckman, mckusick
Tested by:	kris

1 files changed, 0 insertions, 10 deletions

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index f850b67..d1a3ed7 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -270,9 +270,6 @@ static int vnlru_nowhere;
 SYSCTL_INT(_debug, OID_AUTO, vnlru_nowhere, CTLFLAG_RW,
     &vnlru_nowhere, 0, "Number of times the vnlru process ran without success");
 
-/* Hook for calling soft updates. */
-int (*softdep_process_worklist_hook)(struct mount *);
-
 /*
  * Macros to control when a vnode is freed and recycled.  All require
  * the vnode interlock.
@@ -1675,13 +1672,6 @@ sched_sync(void)
 		if (syncer_state == SYNCER_FINAL_DELAY && syncer_final_iter > 0)
 			syncer_final_iter--;
 		mtx_unlock(&sync_mtx);
-
-		/*
-		 * Do soft update processing.
-		 */
-		if (softdep_process_worklist_hook != NULL)
-			(*softdep_process_worklist_hook)(NULL);
-
 		/*
 		 * The variable rushjob allows the kernel to speed up the
 		 * processing of the filesystem syncer process. A rushjob