614 lines
14 KiB
C
614 lines
14 KiB
C
/*
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* Copyright (c) 1990, 1992 Jan-Simon Pendry
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: fdesc_vnops.c,v 1.4 1993/06/07 05:25:22 cgd Exp $
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*/
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/*
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* /dev/fd Filesystem
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*/
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#include "param.h"
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#include "systm.h"
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#include "types.h"
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#include "time.h"
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#include "proc.h"
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#include "resourcevar.h"
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#include "filedesc.h"
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#include "vnode.h"
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#include "file.h"
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#include "stat.h"
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#include "mount.h"
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#include "namei.h"
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#include "buf.h"
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#include "miscfs/fdesc/fdesc.h"
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#include "../ufs/dir.h" /* For readdir() XXX */
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/*
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* vp is the current namei directory
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* ndp is the name to locate in that directory...
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*/
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fdesc_lookup(dvp, ndp, p)
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struct vnode *dvp;
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struct nameidata *ndp;
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struct proc *p;
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{
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char *pname = ndp->ni_ptr;
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int nfiles = p->p_fd->fd_nfiles;
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unsigned fd;
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int error;
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struct vnode *fvp;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_lookup(%s)\n", pname);
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#endif
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if (ndp->ni_namelen == 1 && *pname == '.') {
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ndp->ni_dvp = dvp;
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ndp->ni_vp = dvp;
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VREF(dvp);
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/*VOP_LOCK(dvp);*/
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return (0);
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}
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fd = 0;
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while (*pname >= '0' && *pname <= '9') {
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fd = 10 * fd + *pname++ - '0';
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if (fd >= nfiles)
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break;
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}
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_lookup: fd = %d, *pname = %x\n", fd, *pname);
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#endif
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if (*pname == '/') {
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error = ENOTDIR;
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goto bad;
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}
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if (*pname != '\0') {
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error = ENOENT;
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goto bad;
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}
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if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
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error = EBADF;
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goto bad;
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}
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_lookup: allocate new vnode\n");
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#endif
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error = getnewvnode(VT_FDESC, dvp->v_mount, &fdesc_vnodeops, &fvp);
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if (error)
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goto bad;
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VTOFDESC(fvp)->f_fd = fd;
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/*VTOFDESC(fvp)->f_isroot = 0;*/
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ndp->ni_dvp = dvp;
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ndp->ni_vp = fvp;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_lookup: newvp = %x\n", fvp);
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#endif
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return (0);
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bad:;
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ndp->ni_dvp = dvp;
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ndp->ni_vp = NULL;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_lookup: error = %d\n", error);
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#endif
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return (error);
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}
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fdesc_open(vp, mode, cred, p)
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struct vnode *vp;
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int mode;
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struct ucred *cred;
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struct proc *p;
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{
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int error;
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struct filedesc *fdp;
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struct file *fp;
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int dfd;
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int fd;
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/*
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* Can always open the root (modulo perms)
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*/
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if (vp->v_flag & VROOT)
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return (0);
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/*
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* XXX Kludge: set p->p_dupfd to contain the value of the
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* the file descriptor being sought for duplication. The error
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* return ensures that the vnode for this device will be released
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* by vn_open. Open will detect this special error and take the
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* actions in dupfdopen. Other callers of vn_open or VOP_OPEN
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* will simply report the error.
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*/
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p->p_dupfd = VTOFDESC(vp)->f_fd; /* XXX */
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return (ENODEV);
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}
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static int
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fdesc_attr(fd, vap, cred, p)
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int fd;
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struct vattr *vap;
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struct ucred *cred;
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struct proc *p;
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{
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struct filedesc *fdp = p->p_fd;
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struct file *fp;
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int error;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_attr: fd = %d, nfiles = %d\n", fd, fdp->fd_nfiles);
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#endif
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if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) {
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_attr: fp = %x (EBADF)\n", fp);
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#endif
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return (EBADF);
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}
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/*
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* Can stat the underlying vnode, but not sockets because
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* they don't use struct vattrs. Well, we could convert from
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* a struct stat back to a struct vattr, later...
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*/
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switch (fp->f_type) {
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case DTYPE_VNODE:
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error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p);
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break;
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case DTYPE_SOCKET:
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error = EOPNOTSUPP;
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break;
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default:
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panic("fdesc attr");
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break;
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}
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_attr: returns error %d\n", error);
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#endif
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return (error);
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}
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fdesc_getattr(vp, vap, cred, p)
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struct vnode *vp;
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struct vattr *vap;
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struct ucred *cred;
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struct proc *p;
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{
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unsigned fd;
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int error;
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if (vp->v_flag & VROOT) {
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_getattr: stat rootdir\n");
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#endif
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bzero((caddr_t) vap, sizeof(*vap));
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vattr_null(vap);
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vap->va_type = VDIR;
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vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
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vap->va_nlink = 2;
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vap->va_uid = 0;
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vap->va_gid = 0;
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vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
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vap->va_fileid = 2;
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/* vap->va_qsize = 0; */
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vap->va_size = DEV_BSIZE;
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vap->va_blocksize = DEV_BSIZE;
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microtime(&vap->va_atime);
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vap->va_mtime = vap->va_atime;
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vap->va_ctime = vap->va_ctime;
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vap->va_gen = 0;
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vap->va_flags = 0;
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vap->va_rdev = 0;
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/* vap->va_qbytes = 0; */
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vap->va_bytes = 0;
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return (0);
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}
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fd = VTOFDESC(vp)->f_fd;
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error = fdesc_attr(fd, vap, cred, p);
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if (error == 0)
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vp->v_type = vap->va_type;
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return (error);
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}
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fdesc_setattr(vp, vap, cred, p)
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struct vnode *vp;
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struct vattr *vap;
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struct ucred *cred;
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struct proc *p;
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{
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struct filedesc *fdp = p->p_fd;
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struct file *fp;
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unsigned fd;
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int error;
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/*
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* Can't mess with the root vnode
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*/
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if (vp->v_flag & VROOT)
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return (EACCES);
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fd = VTOFDESC(vp)->f_fd;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_setattr: fd = %d, nfiles = %d\n", fd, fdp->fd_nfiles);
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#endif
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if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) {
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_setattr: fp = %x (EBADF)\n", fp);
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#endif
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return (EBADF);
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}
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/*
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* Can setattr the underlying vnode, but not sockets!
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*/
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switch (fp->f_type) {
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case DTYPE_VNODE:
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error = VOP_SETATTR((struct vnode *) fp->f_data, vap, cred, p);
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break;
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case DTYPE_SOCKET:
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error = EOPNOTSUPP;
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break;
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default:
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panic("fdesc setattr");
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break;
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}
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_setattr: returns error %d\n", error);
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#endif
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return (error);
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}
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fdesc_readdir(vp, uio, cred, eofflagp)
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struct vnode *vp;
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struct uio *uio;
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struct ucred *cred;
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int *eofflagp;
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{
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struct filedesc *fdp;
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int ind, i;
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int error;
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#define UIO_MX 16
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fdp = uio->uio_procp->p_fd;
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ind = uio->uio_offset / UIO_MX;
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error = 0;
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while (uio->uio_resid > 0) {
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struct direct d;
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struct direct *dp = &d;
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if (ind < 2) { /* . or .. */
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bzero((caddr_t) dp, UIO_MX);
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if (ind == 0) {
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strcpy(dp->d_name, ".");
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dp->d_namlen = 1;
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} else if (ind == 1) {
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strcpy(dp->d_name, "..");
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dp->d_namlen = 2;
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} else
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panic("fdesc: ind is negative!");
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dp->d_reclen = UIO_MX;
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dp->d_ino = 2;
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/*
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* And ship to userland
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*/
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error = uiomove((caddr_t) dp, UIO_MX, uio);
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if (error)
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break;
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ind++;
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continue;
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}
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i = ind - 2;
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if (i >= fdp->fd_nfiles) {
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*eofflagp = 1;
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break;
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}
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if (fdp->fd_ofiles[i] != NULL) {
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struct direct d;
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struct direct *dp = &d;
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char *cp = dp->d_name;
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#ifdef FDESC_FILEID
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struct vattr va;
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#endif
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int j;
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bzero((caddr_t) dp, UIO_MX);
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/*
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* Generate an ASCII representation of the name.
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* This can cope with fds in the range 0..99999
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*/
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cp++;
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if (i > 10) cp++;
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if (i > 100) cp++;
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if (i > 1000) cp++;
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if (i > 10000) cp++;
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if (i > 100000) panic("fdesc_readdir");
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dp->d_namlen = cp - dp->d_name;
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*cp = '\0';
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j = i;
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do {
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*--cp = j % 10 + '0';
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j /= 10;
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} while (j > 0);
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/*
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* Fill in the remaining fields
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*/
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dp->d_reclen = UIO_MX;
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dp->d_ino = i + 3;
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#ifdef FDESC_FILEID
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/*
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* If we want the file ids to match the
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* we must call getattr on the underlying file.
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* fdesc_attr may return an error, in which case
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* we ignore the returned file id.
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*/
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error = fdesc_attr(i, &va, cred, p);
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if (error == 0)
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dp->d_ino = va.va_fileid;
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#endif
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/*
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* And ship to userland
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*/
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error = uiomove((caddr_t) dp, UIO_MX, uio);
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if (error)
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break;
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}
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ind++;
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}
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uio->uio_offset = ind * UIO_MX;
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return (error);
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}
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fdesc_inactive(vp, p)
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struct vnode *vp;
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struct proc *p;
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{
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/*
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* Clear out the v_type field to avoid
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* nasty things happening in vgone().
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*/
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vp->v_type = VNON;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_inactive(%x)\n", vp);
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#endif
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return (0);
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}
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/*
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* Print out the contents of a /dev/fd vnode.
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*/
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/* ARGSUSED */
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fdesc_print(vp)
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struct vnode *vp;
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{
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printf("tag VT_FDESC, fdesc vnode\n");
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}
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/*
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* /dev/fd vnode unsupported operation
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*/
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fdesc_enotsupp()
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{
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return (EOPNOTSUPP);
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}
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/*
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* /dev/fd "should never get here" operation
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*/
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fdesc_badop()
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{
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panic("fdesc: bad op");
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/* NOTREACHED */
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}
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/*
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* /dev/fd vnode null operation
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*/
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fdesc_nullop()
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{
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return (0);
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}
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#define fdesc_create ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_mknod ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct ucred *cred, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_close ((int (*) __P(( \
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struct vnode *vp, \
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int fflag, \
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struct ucred *cred, \
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struct proc *p))) nullop)
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#define fdesc_access ((int (*) __P(( \
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struct vnode *vp, \
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int mode, \
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struct ucred *cred, \
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struct proc *p))) nullop)
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#define fdesc_read ((int (*) __P(( \
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struct vnode *vp, \
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struct uio *uio, \
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int ioflag, \
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struct ucred *cred))) fdesc_enotsupp)
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#define fdesc_write ((int (*) __P(( \
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struct vnode *vp, \
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struct uio *uio, \
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int ioflag, \
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struct ucred *cred))) fdesc_enotsupp)
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#define fdesc_ioctl ((int (*) __P(( \
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struct vnode *vp, \
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int command, \
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caddr_t data, \
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int fflag, \
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struct ucred *cred, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_select ((int (*) __P(( \
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struct vnode *vp, \
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int which, \
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int fflags, \
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struct ucred *cred, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_mmap ((int (*) __P(( \
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struct vnode *vp, \
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int fflags, \
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struct ucred *cred, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_fsync ((int (*) __P(( \
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struct vnode *vp, \
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int fflags, \
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struct ucred *cred, \
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int waitfor, \
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struct proc *p))) nullop)
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#define fdesc_seek ((int (*) __P(( \
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struct vnode *vp, \
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off_t oldoff, \
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off_t newoff, \
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struct ucred *cred))) nullop)
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#define fdesc_remove ((int (*) __P(( \
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struct nameidata *ndp, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_link ((int (*) __P(( \
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struct vnode *vp, \
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struct nameidata *ndp, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_rename ((int (*) __P(( \
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struct nameidata *fndp, \
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struct nameidata *tdnp, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_mkdir ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_rmdir ((int (*) __P(( \
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struct nameidata *ndp, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_symlink ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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char *target, \
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struct proc *p))) fdesc_enotsupp)
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#define fdesc_readlink ((int (*) __P(( \
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struct vnode *vp, \
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struct uio *uio, \
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struct ucred *cred))) fdesc_enotsupp)
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#define fdesc_abortop ((int (*) __P(( \
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struct nameidata *ndp))) nullop)
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#ifdef FDESC_DIAGNOSTIC
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int fdesc_reclaim(vp)
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struct vnode *vp;
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{
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printf("fdesc_reclaim(%x)\n", vp);
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return (0);
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}
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#else
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#define fdesc_reclaim ((int (*) __P(( \
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struct vnode *vp))) nullop)
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#endif
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#define fdesc_lock ((int (*) __P(( \
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struct vnode *vp))) nullop)
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#define fdesc_unlock ((int (*) __P(( \
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|
struct vnode *vp))) nullop)
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#define fdesc_bmap ((int (*) __P(( \
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struct vnode *vp, \
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daddr_t bn, \
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|
struct vnode **vpp, \
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|
daddr_t *bnp))) fdesc_badop)
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#define fdesc_strategy ((int (*) __P(( \
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|
struct buf *bp))) fdesc_badop)
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#define fdesc_islocked ((int (*) __P(( \
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|
struct vnode *vp))) nullop)
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#define fdesc_advlock ((int (*) __P(( \
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|
struct vnode *vp, \
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|
caddr_t id, \
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int op, \
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|
struct flock *fl, \
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|
int flags))) fdesc_enotsupp)
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struct vnodeops fdesc_vnodeops = {
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fdesc_lookup, /* lookup */
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fdesc_create, /* create */
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fdesc_mknod, /* mknod */
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fdesc_open, /* open */
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fdesc_close, /* close */
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fdesc_access, /* access */
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fdesc_getattr, /* getattr */
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fdesc_setattr, /* setattr */
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fdesc_read, /* read */
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fdesc_write, /* write */
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fdesc_ioctl, /* ioctl */
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fdesc_select, /* select */
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|
fdesc_mmap, /* mmap */
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fdesc_fsync, /* fsync */
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fdesc_seek, /* seek */
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|
fdesc_remove, /* remove */
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fdesc_link, /* link */
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fdesc_rename, /* rename */
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|
fdesc_mkdir, /* mkdir */
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fdesc_rmdir, /* rmdir */
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|
fdesc_symlink, /* symlink */
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|
fdesc_readdir, /* readdir */
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|
fdesc_readlink, /* readlink */
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|
fdesc_abortop, /* abortop */
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fdesc_inactive, /* inactive */
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|
fdesc_reclaim, /* reclaim */
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|
fdesc_lock, /* lock */
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|
fdesc_unlock, /* unlock */
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|
fdesc_bmap, /* bmap */
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|
fdesc_strategy, /* strategy */
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|
fdesc_print, /* print */
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|
fdesc_islocked, /* islocked */
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|
fdesc_advlock, /* advlock */
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|
};
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