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  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)portal_vfsops.c     8.11 (Berkeley) 5/14/95
  37  *
  38  * $FreeBSD: src/sys/miscfs/portal/portal_vfsops.c,v 1.26.2.2 2001/07/26 20:37:16 iedowse Exp $
  39  * $DragonFly: src/sys/vfs/portal/portal_vfsops.c,v 1.24 2007/05/18 17:05:13 dillon Exp $
  40  */
  41
  42 /*
  43  * Portal Filesystem
  44  */
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/proc.h>
  50 #include <sys/filedesc.h>
  51 #include <sys/file.h>
  52 #include <sys/vnode.h>
  53 #include <sys/mount.h>
  54 #include <sys/malloc.h>
  55 #include <sys/socket.h>
  56 #include <sys/socketvar.h>
  57 #include <sys/protosw.h>
  58 #include <sys/domain.h>
  59 #include "portal.h"
  60
  61 extern struct vop_ops portal_vnode_vops;
  62
  63 static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
  64
  65 static int      portal_mount (struct mount *mp, char *path, caddr_t data,
  66                                   struct ucred *cred);
  67 static int      portal_unmount (struct mount *mp, int mntflags);
  68 static int      portal_root (struct mount *mp, struct vnode **vpp);
  69 static int      portal_statfs (struct mount *mp, struct statfs *sbp,
  70                                 struct ucred *);
  71
  72 /*
  73  * Mount the per-process file descriptors (/dev/fd)
  74  */
  75 static int
  76 portal_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
  77 {
  78         struct file *fp;
  79         struct portal_args args;
  80         struct portalmount *fmp;
  81         struct socket *so;
  82         struct vnode *rvp;
  83         struct portalnode *pn;
  84         size_t size;
  85         int error;
  86
  87         /*
  88          * Update is a no-op
  89          */
  90         if (mp->mnt_flag & MNT_UPDATE)
  91                 return (EOPNOTSUPP);
  92
  93         error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
  94         if (error)
  95                 return (error);
  96
  97         KKASSERT(curproc != NULL);
  98         error = holdsock(curproc->p_fd, args.pa_socket, &fp);
  99         if (error)
 100                 return (error);
 101         so = (struct socket *) fp->f_data;
 102         if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
 103                 fdrop(fp);
 104                 return (ESOCKTNOSUPPORT);
 105         }
 106
 107         MALLOC(pn, struct portalnode *, sizeof(struct portalnode),
 108                 M_TEMP, M_WAITOK);
 109
 110         MALLOC(fmp, struct portalmount *, sizeof(struct portalmount),
 111                 M_PORTALFSMNT, M_WAITOK);       /* XXX */
 112
 113
 114         vfs_add_vnodeops(mp, &portal_vnode_vops, &mp->mnt_vn_norm_ops);
 115
 116         error = getnewvnode(VT_PORTAL, mp, &rvp, 0, 0);
 117         if (error) {
 118                 FREE(fmp, M_PORTALFSMNT);
 119                 FREE(pn, M_TEMP);
 120                 fdrop(fp);
 121                 return (error);
 122         }
 123
 124         rvp->v_data = pn;
 125         rvp->v_type = VDIR;
 126         rvp->v_flag |= VROOT;
 127         VTOPORTAL(rvp)->pt_arg = 0;
 128         VTOPORTAL(rvp)->pt_size = 0;
 129         VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
 130         fmp->pm_root = rvp;
 131         fmp->pm_server = fp; fp->f_count++;
 132
 133         mp->mnt_flag |= MNT_LOCAL;
 134         mp->mnt_data = (qaddr_t) fmp;
 135         vfs_getnewfsid(mp);
 136
 137         (void)copyinstr(args.pa_config,
 138             mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
 139         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 140
 141 #ifdef notdef
 142         bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
 143         bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
 144 #endif
 145         vx_unlock(rvp);
 146
 147         (void)portal_statfs(mp, &mp->mnt_stat, cred);
 148         fdrop(fp);
 149         return (0);
 150 }
 151
 152 static int
 153 portal_unmount(struct mount *mp, int mntflags)
 154 {
 155         int error, flags = 0;
 156
 157
 158         if (mntflags & MNT_FORCE)
 159                 flags |= FORCECLOSE;
 160
 161         /*
 162          * Clear out buffer cache.  I don't think we
 163          * ever get anything cached at this level at the
 164          * moment, but who knows...
 165          */
 166 #ifdef notyet
 167         mntflushbuf(mp, 0);
 168         if (mntinvalbuf(mp, 1))
 169                 return (EBUSY);
 170 #endif
 171         /* There is 1 extra root vnode reference (pm_root). */
 172         error = vflush(mp, 1, flags);
 173         if (error)
 174                 return (error);
 175
 176         /*
 177          * Shutdown the socket.  This will cause the select in the
 178          * daemon to wake up, and then the accept will get ECONNABORTED
 179          * which it interprets as a request to go and bury itself.
 180          */
 181         soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data,
 182                 SHUT_RDWR);
 183         /*
 184          * Discard reference to underlying file.  Must call closef because
 185          * this may be the last reference.
 186          */
 187         closef(VFSTOPORTAL(mp)->pm_server, NULL);
 188         /*
 189          * Finally, throw away the portalmount structure
 190          */
 191         kfree(mp->mnt_data, M_PORTALFSMNT);     /* XXX */
 192         mp->mnt_data = 0;
 193         return (0);
 194 }
 195
 196 static int
 197 portal_root(struct mount *mp, struct vnode **vpp)
 198 {
 199         struct vnode *vp;
 200         int error;
 201
 202         /*
 203          * Return locked reference to root.
 204          */
 205         vp = VFSTOPORTAL(mp)->pm_root;
 206         error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
 207         if (error == 0)
 208                 *vpp = vp;
 209         return (error);
 210 }
 211
 212 static int
 213 portal_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 214 {
 215         sbp->f_flags = 0;
 216         sbp->f_bsize = DEV_BSIZE;
 217         sbp->f_iosize = DEV_BSIZE;
 218         sbp->f_blocks = 2;              /* 1K to keep df happy */
 219         sbp->f_bfree = 0;
 220         sbp->f_bavail = 0;
 221         sbp->f_files = 1;               /* Allow for "." */
 222         sbp->f_ffree = 0;               /* See comments above */
 223         if (sbp != &mp->mnt_stat) {
 224                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
 225                 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
 226                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 227         }
 228         return (0);
 229 }
 230
 231 static struct vfsops portal_vfsops = {
 232         .vfs_mount =            portal_mount,
 233         .vfs_unmount =          portal_unmount,
 234         .vfs_root =             portal_root,
 235         .vfs_statfs =           portal_statfs,
 236         .vfs_sync =             vfs_stdsync
 237 };
 238
 239 VFS_SET(portal_vfsops, portal, VFCF_SYNTHETIC);