DragonFly commits List (threaded) for 2006-05
cvs commit: src/sys/vfs/deadfs dead_vnops.c
dillon 2006/05/24 18:20:07 PDT
DragonFly src repository
When a vnode is vgone()'d its v_ops is replaced with dead_vnode_ops.
dead_vnode_ops replaces VOP_LOCK with a dummy routine that just returns
This blows up anyone actually trying to access the vnode by improperly
returning a successful lock which then panics the machine when the caller
tries to unlock it. This also screws up VOP_LOCK vs vx_lock() interactions
and can theoretically create other problems.
Normally vgone()'d vnodes have no references and this isn't a problem.
The two notable exceptions are (1) when revoke() is called on a device
(i.e. tty), and (2) when a procfs or linprocfs vnode is destroyed due
to a process exit while another process is accessing it.
Remove dead_lock(). Dead vnodes revert to defaultops which implement
the expected lockmgr lock.
Revision Changes Path
1.17 +0 -13 src/sys/vfs/deadfs/dead_vnops.c