Author: kib
Date: Fri Aug 29 09:02:01 2014
New Revision: 270795
URL: http://svnweb.freebsd.org/changeset/base/270795
Log:
Add function and wrapper to switch lockmgr and vnode lock back to
auto-promotion of shared to exclusive.
Tested by: hrs, pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/kern/kern_lock.c
head/sys/sys/lockmgr.h
head/sys/sys/vnode.h
Modified: head/sys/kern/kern_lock.c
==============================================================================
--- head/sys/kern/kern_lock.c Fri Aug 29 08:55:58 2014 (r270794)
+++ head/sys/kern/kern_lock.c Fri Aug 29 09:02:01 2014 (r270795)
@@ -418,6 +418,14 @@ lockallowshare(struct lock *lk)
}
void
+lockdisableshare(struct lock *lk)
+{
+
+ lockmgr_assert(lk, KA_XLOCKED);
+ lk->lock_object.lo_flags |= LK_NOSHARE;
+}
+
+void
lockallowrecurse(struct lock *lk)
{
Modified: head/sys/sys/lockmgr.h
==============================================================================
--- head/sys/sys/lockmgr.h Fri Aug 29 08:55:58 2014 (r270794)
+++ head/sys/sys/lockmgr.h Fri Aug 29 09:02:01 2014 (r270795)
@@ -77,6 +77,7 @@ void lockallowrecurse(struct lock *lk);
void lockallowshare(struct lock *lk);
void lockdestroy(struct lock *lk);
void lockdisablerecurse(struct lock *lk);
+void lockdisableshare(struct lock *lk);
void lockinit(struct lock *lk, int prio, const char *wmesg, int timo,
int flags);
#ifdef DDB
Modified: head/sys/sys/vnode.h
==============================================================================
--- head/sys/sys/vnode.h Fri Aug 29 08:55:58 2014 (r270794)
+++ head/sys/sys/vnode.h Fri Aug 29 09:02:01 2014 (r270795)
@@ -428,6 +428,7 @@ extern struct vattr va_null; /* predefi
#define VN_LOCK_AREC(vp) lockallowrecurse((vp)->v_vnlock)
#define VN_LOCK_ASHARE(vp) lockallowshare((vp)->v_vnlock)
+#define VN_LOCK_DSHARE(vp) lockdisableshare((vp)->v_vnlock)
#endif /* _KERNEL */
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