sys/vfs/portal/portal_vfsops.c

   1 /*
   2  * Copyright (c) 1992, 1993, 1995
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software donated to Berkeley by
   6  * Jan-Simon Pendry.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)portal_vfsops.c     8.11 (Berkeley) 5/14/95
  33  *
  34  * $FreeBSD: src/sys/miscfs/portal/portal_vfsops.c,v 1.26.2.2 2001/07/26 20:37:16 iedowse Exp $
  35  */
  36
  37 /*
  38  * Portal Filesystem
  39  */
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/kernel.h>
  44 #include <sys/proc.h>
  45 #include <sys/filedesc.h>
  46 #include <sys/file.h>
  47 #include <sys/vnode.h>
  48 #include <sys/mount.h>
  49 #include <sys/malloc.h>
  50 #include <sys/socket.h>
  51 #include <sys/socketvar.h>
  52 #include <sys/protosw.h>
  53 #include <sys/domain.h>
  54 #include "portal.h"
  55
  56 extern struct vop_ops portal_vnode_vops;
  57
  58 static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
  59
  60 static int      portal_mount (struct mount *mp, char *path, caddr_t data,
  61                                   struct ucred *cred);
  62 static int      portal_unmount (struct mount *mp, int mntflags);
  63 static int      portal_root (struct mount *mp, struct vnode **vpp);
  64 static int      portal_statfs (struct mount *mp, struct statfs *sbp,
  65                                 struct ucred *);
  66
  67 /*
  68  * Mount the per-process file descriptors (/dev/fd)
  69  */
  70 static int
  71 portal_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
  72 {
  73         struct file *fp;
  74         struct portal_args args;
  75         struct portalmount *fmp;
  76         struct socket *so;
  77         struct vnode *rvp;
  78         struct portalnode *pn;
  79         size_t size;
  80         int error;
  81
  82         /*
  83          * Update is a no-op
  84          */
  85         if (mp->mnt_flag & MNT_UPDATE)
  86                 return (EOPNOTSUPP);
  87
  88         error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
  89         if (error)
  90                 return (error);
  91
  92         KKASSERT(curproc != NULL);
  93         error = holdsock(curproc->p_fd, args.pa_socket, &fp);
  94         if (error)
  95                 return (error);
  96         so = (struct socket *) fp->f_data;
  97         if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
  98                 fdrop(fp);
  99                 return (ESOCKTNOSUPPORT);
 100         }
 101
 102         pn = kmalloc(sizeof(struct portalnode), M_TEMP, M_WAITOK);
 103
 104         fmp = kmalloc(sizeof(struct portalmount), M_PORTALFSMNT, M_WAITOK);     /* XXX */
 105
 106
 107         vfs_add_vnodeops(mp, &portal_vnode_vops, &mp->mnt_vn_norm_ops);
 108
 109         error = getnewvnode(VT_PORTAL, mp, &rvp, 0, 0);
 110         if (error) {
 111                 kfree(fmp, M_PORTALFSMNT);
 112                 kfree(pn, M_TEMP);
 113                 fdrop(fp);
 114                 return (error);
 115         }
 116
 117         rvp->v_data = pn;
 118         rvp->v_type = VDIR;
 119         vsetflags(rvp, VROOT);
 120         VTOPORTAL(rvp)->pt_arg = 0;
 121         VTOPORTAL(rvp)->pt_size = 0;
 122         VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
 123         fmp->pm_root = rvp;
 124         fmp->pm_server = fp; fp->f_count++;
 125
 126         mp->mnt_flag |= MNT_LOCAL;
 127         mp->mnt_data = (qaddr_t) fmp;
 128         vfs_getnewfsid(mp);
 129
 130         (void)copyinstr(args.pa_config,
 131             mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 132         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 133
 134 #ifdef notdef
 135         bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
 136         bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
 137 #endif
 138         vx_unlock(rvp);
 139
 140         (void)portal_statfs(mp, &mp->mnt_stat, cred);
 141         fdrop(fp);
 142         return (0);
 143 }
 144
 145 static int
 146 portal_unmount(struct mount *mp, int mntflags)
 147 {
 148         int error, flags = 0;
 149
 150
 151         if (mntflags & MNT_FORCE)
 152                 flags |= FORCECLOSE;
 153
 154         /*
 155          * Clear out buffer cache.  I don't think we
 156          * ever get anything cached at this level at the
 157          * moment, but who knows...
 158          */
 159 #ifdef notyet
 160         mntflushbuf(mp, 0);
 161         if (mntinvalbuf(mp, 1))
 162                 return (EBUSY);
 163 #endif
 164         /* There is 1 extra root vnode reference (pm_root). */
 165         error = vflush(mp, 1, flags);
 166         if (error)
 167                 return (error);
 168
 169         /*
 170          * Shutdown the socket.  This will cause the select in the
 171          * daemon to wake up, and then the accept will get ECONNABORTED
 172          * which it interprets as a request to go and bury itself.
 173          */
 174         soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data,
 175                 SHUT_RDWR);
 176         /*
 177          * Discard reference to underlying file.  Must call closef because
 178          * this may be the last reference.
 179          */
 180         closef(VFSTOPORTAL(mp)->pm_server, NULL);
 181         /*
 182          * Finally, throw away the portalmount structure
 183          */
 184         kfree(mp->mnt_data, M_PORTALFSMNT);     /* XXX */
 185         mp->mnt_data = 0;
 186         return (0);
 187 }
 188
 189 static int
 190 portal_root(struct mount *mp, struct vnode **vpp)
 191 {
 192         struct vnode *vp;
 193         int error;
 194
 195         /*
 196          * Return locked reference to root.
 197          */
 198         vp = VFSTOPORTAL(mp)->pm_root;
 199         error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
 200         if (error == 0)
 201                 *vpp = vp;
 202         return (error);
 203 }
 204
 205 static int
 206 portal_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 207 {
 208         sbp->f_flags = 0;
 209         sbp->f_bsize = DEV_BSIZE;
 210         sbp->f_iosize = DEV_BSIZE;
 211         sbp->f_blocks = 2;              /* 1K to keep df happy */
 212         sbp->f_bfree = 0;
 213         sbp->f_bavail = 0;
 214         sbp->f_files = 1;               /* Allow for "." */
 215         sbp->f_ffree = 0;               /* See comments above */
 216         if (sbp != &mp->mnt_stat) {
 217                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
 218                 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
 219                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 220         }
 221         return (0);
 222 }
 223
 224 static struct vfsops portal_vfsops = {
 225         .vfs_mount =            portal_mount,
 226         .vfs_unmount =          portal_unmount,
 227         .vfs_root =             portal_root,
 228         .vfs_statfs =           portal_statfs,
 229         .vfs_sync =             vfs_stdsync
 230 };
 231
 232 VFS_SET(portal_vfsops, portal, VFCF_SYNTHETIC);
 233 MODULE_VERSION(portal, 1);