VOP_VPTOCNP(9)

NAME
VOP_VPTOCNP - translate a vnode to its component name

SYNOPSIS
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/vnode.h>
int
VOP_VPTOCNP(struct vnode *vp, struct vnode **dvp, struct ucred *cred, char *buf, int *buflen);

DESCRIPTION
This translates a vnode into its component name, and writes that name to the head of the buffer specified by buf.

vp  The vnode to translate.

dvp The vnode of the parent directory of vp.

cred
    The caller credentials.

buf The buffer into which to prepend the component name.

buflen
    The remaining size of the buffer.

The default implementation of VOP_VPTOCNP scans through vp's parent directory looking for a dirent with a matching file number. If vp is not a directory, then VOP_VPTOCNP returns ENOENT.

LOCKS
The vnode should be locked on entry and will still be locked on exit. The parent directory vnode will be unlocked on a successful exit. However, it will have its use count incremented.

RETURN VALUES
Zero is returned on success, otherwise an error code is returned.

ERRORS

[ENOMEM]
    The buffer was not large enough to hold the vnode's component name.

[ENOENT]
    The vnode was not found on the file system.

SEE ALSO
vnode(9), VOP_LOOKUP(9)

NOTES
This interface is a work in progress.

HISTORY
The function VOP_VPTOCNP appeared in FreeBSD 8.0.

AUTHORS
This manual page was written by Joe Marcus Clarke.