Manual Pages  — VOP_VPTOCNP

VOP_VPTOCNP – translate a vnode to its component name

SYNOPSIS DESCRIPTION LOCKS RETURN VALUES ERRORS SEE ALSO NOTES HISTORY AUTHORS

#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);

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, Ns, 's parent directory looking for a dirent with a matching file number. If vp is not a directory, then VOP_VPTOCNP returns ENOENT.

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.

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

[ENOMEM]
	The buffer was not large enough to hold the vnode's component name.
[ENOENT]
	The vnode was not found on the file system.

This interface is a work in progress.

The function VOP_VPTOCNP appeared in FreeBSD 8.0 .

This manual page was written by Joe Marcus Clarke.