vcount, count_dev - "get total number of references to a device"
Synopsis Description Return Values See Also Authors
.In sys/param.h .In sys/time.h .In sys/conf.h .In sys/vnode.h int vcount "struct vnode *vp" int count_dev "dev_t dev"
vcount is used to get the number of references to a particular device. It allows for the fact that multiple vnodes may reference the same device. count_dev does the same thing as vcount, but takes a .Vt dev_t rather than a .Vt "struct vnode" pointer as an argument.
vcount and count_dev both return the number of references to the device.