freebsd man page for vop_vptocnp

VOP_VPTOCNP(9)						   BSD Kernel Developer's Manual					    VOP_VPTOCNP(9)

NAME
     VOP_VPTOCNP -- translate a vnode to its component name

SYNOPSIS
     #include <sys/param.h>
     #include <sys/vnode.h>

     int
     VOP_VPTOCNP(struct vnode *vp, struct vnode **dvp, 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.

     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.

BSD
								 November 19, 2011							       BSD