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Subject: PERFORCE change 200660 for review
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http://p4web.freebsd.org/@@200660?ac=10

Change 200660 by jhb@jhb_jhbbsd on 2011/10/24 18:36:43

	Add a new V_CLEANONLY flag for vinvalbuf() which causes it
	to only flush clean buffers.

Affected files ...

.. //depot/projects/fadvise/sys/kern/vfs_subr.c#2 edit
.. //depot/projects/fadvise/sys/sys/vnode.h#3 edit

Differences ...

==== //depot/projects/fadvise/sys/kern/vfs_subr.c#2 (text+ko) ====

@@ -1191,7 +1191,7 @@
 	do {
 		error = flushbuflist(&bo->bo_clean,
 		    flags, bo, slpflag, slptimeo);
-		if (error == 0)
+		if (error == 0 && !(flags & V_CLEANONLY))
 			error = flushbuflist(&bo->bo_dirty,
 			    flags, bo, slpflag, slptimeo);
 		if (error != 0 && error != EAGAIN) {
@@ -1220,7 +1220,8 @@
 	/*
 	 * Destroy the copy in the VM cache, too.
 	 */
-	if (bo->bo_object != NULL && (flags & (V_ALT | V_NORMAL)) == 0) {
+	if (bo->bo_object != NULL &&
+	    (flags & (V_ALT | V_NORMAL | V_CLEANONLY)) == 0) {
 		VM_OBJECT_LOCK(bo->bo_object);
 		vm_object_page_remove(bo->bo_object, 0, 0, (flags & V_SAVE) ?
 		    OBJPR_CLEANONLY : 0);
@@ -1229,7 +1230,7 @@
 
 #ifdef INVARIANTS
 	BO_LOCK(bo);
-	if ((flags & (V_ALT | V_NORMAL)) == 0 &&
+	if ((flags & (V_ALT | V_NORMAL | V_CLEANONLY)) == 0 &&
 	    (bo->bo_dirty.bv_cnt > 0 || bo->bo_clean.bv_cnt > 0))
 		panic("vinvalbuf: flush failed");
 	BO_UNLOCK(bo);

==== //depot/projects/fadvise/sys/sys/vnode.h#3 (text+ko) ====

@@ -384,6 +384,7 @@
 #define	V_SAVE		0x0001	/* vinvalbuf: sync file first */
 #define	V_ALT		0x0002	/* vinvalbuf: invalidate only alternate bufs */
 #define	V_NORMAL	0x0004	/* vinvalbuf: invalidate only regular bufs */
+#define	V_CLEANONLY	0x0008	/* vinvalbuf: invalidate only clean bufs */
 #define	REVOKEALL	0x0001	/* vop_revoke: revoke all aliases */
 #define	V_WAIT		0x0001	/* vn_start_write: sleep for suspend */
 #define	V_NOWAIT	0x0002	/* vn_start_write: don't sleep for suspend */