portal_vfsops.c

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    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  * $FreeBSD$
   35  */
   36 
   37 /*
   38  * Portal Filesystem
   39  */
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/domain.h>
   44 #include <sys/filedesc.h>
   45 #include <sys/kernel.h>
   46 #include <sys/lock.h>
   47 #include <sys/mutex.h>
   48 #include <sys/malloc.h>
   49 #include <sys/file.h>           /* Must come after sys/malloc.h */
   50 #include <sys/mount.h>
   51 #include <sys/proc.h>
   52 #include <sys/protosw.h>
   53 #include <sys/socket.h>
   54 #include <sys/socketvar.h>
   55 #include <sys/vnode.h>
   56 
   57 #include <fs/portalfs/portal.h>
   58 
   59 static MALLOC_DEFINE(M_PORTALFSMNT, "portal_mount", "PORTAL mount structure");
   60 
   61 static vfs_unmount_t    portal_unmount;
   62 static vfs_root_t       portal_root;
   63 static vfs_statfs_t     portal_statfs;
   64 
   65 static const char *portal_opts[] = {
   66         "socket", "config",
   67         NULL
   68 };
   69 
   70 static int
   71 portal_cmount(struct mntarg *ma, void *data, int flags)
   72 {
   73         struct portal_args args;
   74         int error;
   75 
   76         if (data == NULL)
   77                 return (EINVAL);
   78         error = copyin(data, &args, sizeof args);
   79         if (error)
   80                 return (error);
   81 
   82         ma = mount_argf(ma, "socket", "%d", args.pa_socket);
   83         ma = mount_argsu(ma, "config", args.pa_config, MAXPATHLEN);
   84         error = kernel_mount(ma, flags);
   85 
   86         return (error);
   87 }
   88 
   89 /*
   90  * Mount the per-process file descriptors (/dev/fd)
   91  */
   92 static int
   93 portal_mount(struct mount *mp)
   94 {
   95         struct file *fp;
   96         struct portalmount *fmp;
   97         struct socket *so;
   98         struct vnode *rvp;
   99         struct thread *td;
  100         struct portalnode *pn;
  101         int error, v;
  102         char *p;
  103 
  104         td = curthread;
  105         if (vfs_filteropt(mp->mnt_optnew, portal_opts))
  106                 return (EINVAL);
  107 
  108         error = vfs_scanopt(mp->mnt_optnew, "socket", "%d", &v);
  109         if (error != 1)
  110                 return (EINVAL);
  111         error = vfs_getopt(mp->mnt_optnew, "config", (void **)&p, NULL);
  112         if (error)
  113                 return (error);
  114 
  115         if ((error = fget(td, v, &fp)) != 0)
  116                 return (error);
  117         if (fp->f_type != DTYPE_SOCKET) {
  118                 fdrop(fp, td);
  119                 return(ENOTSOCK);
  120         }
  121         so = fp->f_data;        /* XXX race against userland */
  122         if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
  123                 fdrop(fp, td);
  124                 return (ESOCKTNOSUPPORT);
  125         }
  126 
  127         pn = malloc(sizeof(struct portalnode),
  128                 M_TEMP, M_WAITOK);
  129 
  130         fmp = malloc(sizeof(struct portalmount),
  131                 M_PORTALFSMNT, M_WAITOK);       /* XXX */
  132 
  133         error = getnewvnode("portal", mp, &portal_vnodeops, &rvp); /* XXX */
  134         if (error) {
  135                 free(fmp, M_PORTALFSMNT);
  136                 free(pn, M_TEMP);
  137                 fdrop(fp, td);
  138                 return (error);
  139         }
  140 
  141         error = insmntque(rvp, mp);     /* XXX: Too early for mpsafe fs */
  142         if (error != 0) {
  143                 free(fmp, M_PORTALFSMNT);
  144                 free(pn, M_TEMP);
  145                 fdrop(fp, td);
  146                 return (error);
  147         }
  148         rvp->v_data = pn;
  149         rvp->v_type = VDIR;
  150         rvp->v_vflag |= VV_ROOT;
  151         VTOPORTAL(rvp)->pt_arg = 0;
  152         VTOPORTAL(rvp)->pt_size = 0;
  153         VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
  154         fmp->pm_root = rvp;
  155         fhold(fp);
  156         fmp->pm_server = fp;
  157 
  158         MNT_ILOCK(mp);
  159         mp->mnt_flag |= MNT_LOCAL;
  160         MNT_IUNLOCK(mp);
  161         mp->mnt_data =  fmp;
  162         vfs_getnewfsid(mp);
  163 
  164         vfs_mountedfrom(mp, p);
  165         fdrop(fp, td);
  166         return (0);
  167 }
  168 
  169 static int
  170 portal_unmount(mp, mntflags)
  171         struct mount *mp;
  172         int mntflags;
  173 {
  174         int error, flags = 0;
  175 
  176 
  177         if (mntflags & MNT_FORCE)
  178                 flags |= FORCECLOSE;
  179 
  180         /*
  181          * Clear out buffer cache.  I don't think we
  182          * ever get anything cached at this level at the
  183          * moment, but who knows...
  184          */
  185 #ifdef notyet
  186         mntflushbuf(mp, 0);
  187         if (mntinvalbuf(mp, 1))
  188                 return (EBUSY);
  189 #endif
  190         /* There is 1 extra root vnode reference (pm_root). */
  191         error = vflush(mp, 1, flags, curthread);
  192         if (error)
  193                 return (error);
  194 
  195         /*
  196          * Shutdown the socket.  This will cause the select in the
  197          * daemon to wake up, and then the accept will get ECONNABORTED
  198          * which it interprets as a request to go and bury itself.
  199          */
  200         soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2);
  201         /*
  202          * Discard reference to underlying file.  Must call closef because
  203          * this may be the last reference.
  204          */
  205         closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0);
  206         /*
  207          * Finally, throw away the portalmount structure
  208          */
  209         free(mp->mnt_data, M_PORTALFSMNT);      /* XXX */
  210         mp->mnt_data = 0;
  211         return (0);
  212 }
  213 
  214 static int
  215 portal_root(mp, flags, vpp)
  216         struct mount *mp;
  217         int flags;
  218         struct vnode **vpp;
  219 {
  220         struct vnode *vp;
  221 
  222         /*
  223          * Return locked reference to root.
  224          */
  225         vp = VFSTOPORTAL(mp)->pm_root;
  226         VREF(vp);
  227         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
  228         *vpp = vp;
  229         return (0);
  230 }
  231 
  232 static int
  233 portal_statfs(mp, sbp)
  234         struct mount *mp;
  235         struct statfs *sbp;
  236 {
  237 
  238         sbp->f_flags = 0;
  239         sbp->f_bsize = DEV_BSIZE;
  240         sbp->f_iosize = DEV_BSIZE;
  241         sbp->f_blocks = 2;              /* 1K to keep df happy */
  242         sbp->f_bfree = 0;
  243         sbp->f_bavail = 0;
  244         sbp->f_files = 1;               /* Allow for "." */
  245         sbp->f_ffree = 0;               /* See comments above */
  246         return (0);
  247 }
  248 
  249 static struct vfsops portal_vfsops = {
  250         .vfs_cmount =           portal_cmount,
  251         .vfs_mount =            portal_mount,
  252         .vfs_root =             portal_root,
  253         .vfs_statfs =           portal_statfs,
  254         .vfs_unmount =          portal_unmount,
  255 };
  256 
  257 VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC);

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FreeBSD/Linux Kernel Cross Reference sys/fs/portalfs/portal_vfsops.c

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sys/fs/portalfs/portal_vfsops.c