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VGET (9) | Kernel routines | Unix Manual Pages | :man

NAME

vget - get a vnode from the free list

CONTENTS

Synopsis
Description
See Also
Authors

SYNOPSIS


.In sys/param.h
.In sys/vnode.h int vget "struct vnode *vp" "int lockflag" "struct thread *td"

DESCRIPTION

Get a vnode from the free list and increment its reference count.
vp The vnode to remove from the free list.
lockflag
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 VOP_LOOKUP(9) then the new user must call vget to increment the reference count and remove it from the free list.

SEE ALSO

vnode(9), vput(9), vref(9), vrele(9)

AUTHORS


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