get a vnode from the free list
Get a vnode from the free list and increment its reference count.
- The vnode to remove from the free list.
- If non-zero, the vnode will also be locked.
When not in use, vnodes are kept on a free list. The vnodes still reference
valid files but may be reused to refer to a new file at any time. Often, these
vnodes are also held in caches in the system, such as the name cache.
When a vnode which is on the free list is used again, for instance if the vnode
was found in the name cache as a result of a call to
then the new user must call
increment the reference count and remove it from the free list.
This manual page was written by Doug