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.