tjr 35c71928a0 MFp4: Fix two bugs causing possible deadlocks or panics, and one nit: ... - Emulate lock draining (LK_DRAIN) in null_lock() to avoid deadlocks when the vnode is being recycled. - Don't allow null_nodeget() to return a nullfs vnode from the wrong mount when multiple nullfs's are mounted. It's unclear why these checks were removed in null_subr.c 1.35, but they are definitely necessary. Without the checks, trying to unmount a nullfs mount will erroneously return EBUSY, and forcibly unmounting with -f will cause a panic. - Bump LOG2_SIZEVNODE up to 8, since vnodes are >256 bytes now. The old value (7) didn't cause any problems, but made the hash algorithm suboptimal. These changes fix nullfs enough that a parallel buildworld succeeds. Submitted by: tegge (partially; LK_DRAIN) Tested by: kris		2003-06-17 08:52:45 +00:00
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null_subr.c	MFp4: Fix two bugs causing possible deadlocks or panics, and one nit:	2003-06-17 08:52:45 +00:00
null_vfsops.c	Initialize struct vfsops C99-sparsely.	2003-06-12 20:48:38 +00:00
null_vnops.c	MFp4: Fix two bugs causing possible deadlocks or panics, and one nit:	2003-06-17 08:52:45 +00:00
null.h	MFp4: Fix two bugs causing possible deadlocks or panics, and one nit:	2003-06-17 08:52:45 +00:00