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.

Debian                                            March 8, 2015                                   VOP_VPTOCNP(9)