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Add function and wrapper to switch lockmgr and vnode lock back to

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auto-promotion of shared to exclusive.

Approved by:	re (gjb)
This commit is contained in:
kib 2014-09-05 13:22:28 +00:00
parent ddbdadae3d
commit 78a27e5e59
3 changed files with 10 additions and 0 deletions
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8
sys/kern/kern_lock.c
View File

@ -418,6 +418,14 @@ lockallowshare(struct lock *lk)
lk->lock_object.lo_flags &= ~LK_NOSHARE;
}
void
lockdisableshare(struct lock *lk)
{
lockmgr_assert(lk, KA_XLOCKED);
lk->lock_object.lo_flags |= LK_NOSHARE;
}
void
lockallowrecurse(struct lock *lk)
{

1
sys/sys/lockmgr.h
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@ -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

1
sys/sys/vnode.h
View File

@ -428,6 +428,7 @@ extern struct vattr va_null; /* predefined null vattr structure */
#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 */