/* $OpenBSD: netbsd_getdents.c,v 1.4 2001/09/05 23:38:28 art Exp $ */ /* * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 */ #include #include #include #include #include #include #include #include #include #include static int netbsd_vn_readdir __P((struct file *, char *, int, u_int, int *, struct proc *, off_t **, int *)); static int netbsd_vn_readdir(fp, buf, segflg, count, done, p, cookies, ncookies) struct file *fp; char *buf; int segflg, *done, *ncookies; u_int count; struct proc *p; off_t **cookies; { struct vnode *vp = (struct vnode *)fp->f_data; struct iovec aiov; struct uio auio; int error, eofflag; unionread: if (vp->v_type != VDIR) return (EINVAL); aiov.iov_base = buf; aiov.iov_len = count; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_segflg = segflg; auio.uio_procp = p; auio.uio_resid = count; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); auio.uio_offset = fp->f_offset; error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, ncookies, (u_long **)cookies); /* XXX 32-bit? */ fp->f_offset = auio.uio_offset; VOP_UNLOCK(vp, 0, p); if (error) return (error); #ifdef UNION { extern int (**union_vnodeop_p) __P((void *)); extern struct vnode *union_dircache __P((struct vnode *)); if (count == auio.uio_resid && (vp->v_op == union_vnodeop_p)) { struct vnode *lvp; lvp = union_dircache(vp); if (lvp != NULLVP) { struct vattr va; /* * If the directory is opaque, * then don't show lower entries */ error = VOP_GETATTR(vp, &va, fp->f_cred, p); if (va.va_flags & OPAQUE) { vput(lvp); lvp = NULL; } } if (lvp != NULLVP) { error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); if (error) { vput(lvp); return (error); } VOP_UNLOCK(lvp, 0, p); fp->f_data = (caddr_t) lvp; fp->f_offset = 0; error = vn_close(vp, FREAD, fp->f_cred, p); if (error) return (error); vp = lvp; goto unionread; } } } #endif /* UNION */ if (count == auio.uio_resid && (vp->v_flag & VROOT) && (vp->v_mount->mnt_flag & MNT_UNION)) { struct vnode *tvp = vp; vp = vp->v_mount->mnt_vnodecovered; VREF(vp); fp->f_data = (caddr_t) vp; fp->f_offset = 0; vrele(tvp); goto unionread; } *done = count - auio.uio_resid; return error; } /* * Read a block of directory entries in a file system independent format. */ int netbsd_sys_getdents(p, v, retval) struct proc *p; void *v; register_t *retval; { register struct netbsd_sys_getdents_args /* { syscallarg(int) fd; syscallarg(char *) buf; syscallarg(size_t) count; } */ *uap = v; struct file *fp; int error, done; if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FREAD) == 0) return (EBADF); error = netbsd_vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, SCARG(uap, count), &done, p, 0, 0); *retval = done; return (error); }