The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/portalfs/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: releng/9.0/sys/fs/portalfs/portal_vfsops.c 224778 2011-08-11 12:30:23Z rwatson $
   35  */
   36 
   37 /*
   38  * Portal Filesystem
   39  */
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/capability.h>
   44 #include <sys/domain.h>
   45 #include <sys/filedesc.h>
   46 #include <sys/kernel.h>
   47 #include <sys/lock.h>
   48 #include <sys/mutex.h>
   49 #include <sys/malloc.h>
   50 #include <sys/file.h>           /* Must come after sys/malloc.h */
   51 #include <sys/mount.h>
   52 #include <sys/proc.h>
   53 #include <sys/protosw.h>
   54 #include <sys/socket.h>
   55 #include <sys/socketvar.h>
   56 #include <sys/vnode.h>
   57 
   58 #include <fs/portalfs/portal.h>
   59 
   60 static MALLOC_DEFINE(M_PORTALFSMNT, "portal_mount", "PORTAL mount structure");
   61 
   62 static vfs_unmount_t    portal_unmount;
   63 static vfs_root_t       portal_root;
   64 static vfs_statfs_t     portal_statfs;
   65 
   66 static const char *portal_opts[] = {
   67         "socket", "config",
   68         NULL
   69 };
   70 
   71 static int
   72 portal_cmount(struct mntarg *ma, void *data, int flags)
   73 {
   74         struct portal_args args;
   75         int error;
   76 
   77         if (data == NULL)
   78                 return (EINVAL);
   79         error = copyin(data, &args, sizeof args);
   80         if (error)
   81                 return (error);
   82 
   83         ma = mount_argf(ma, "socket", "%d", args.pa_socket);
   84         ma = mount_argsu(ma, "config", args.pa_config, MAXPATHLEN);
   85         error = kernel_mount(ma, flags);
   86 
   87         return (error);
   88 }
   89 
   90 /*
   91  * Mount the per-process file descriptors (/dev/fd)
   92  */
   93 static int
   94 portal_mount(struct mount *mp)
   95 {
   96         struct file *fp;
   97         struct portalmount *fmp;
   98         struct socket *so;
   99         struct vnode *rvp;
  100         struct thread *td;
  101         struct portalnode *pn;
  102         int error, v;
  103         char *p;
  104 
  105         td = curthread;
  106         if (vfs_filteropt(mp->mnt_optnew, portal_opts))
  107                 return (EINVAL);
  108 
  109         error = vfs_scanopt(mp->mnt_optnew, "socket", "%d", &v);
  110         if (error != 1)
  111                 return (EINVAL);
  112         error = vfs_getopt(mp->mnt_optnew, "config", (void **)&p, NULL);
  113         if (error)
  114                 return (error);
  115 
  116         /*
  117          * Capsicum is not incompatible with portalfs, but we don't really
  118          * know what rights are required. In the spirit of "better safe than
  119          * sorry", pretend that all rights are required for now.
  120          */
  121         if ((error = fget(td, v, CAP_MASK_VALID, &fp)) != 0)
  122                 return (error);
  123         if (fp->f_type != DTYPE_SOCKET) {
  124                 fdrop(fp, td);
  125                 return(ENOTSOCK);
  126         }
  127         so = fp->f_data;        /* XXX race against userland */
  128         if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
  129                 fdrop(fp, td);
  130                 return (ESOCKTNOSUPPORT);
  131         }
  132 
  133         pn = malloc(sizeof(struct portalnode),
  134                 M_TEMP, M_WAITOK);
  135 
  136         fmp = malloc(sizeof(struct portalmount),
  137                 M_PORTALFSMNT, M_WAITOK);       /* XXX */
  138 
  139         error = getnewvnode("portal", mp, &portal_vnodeops, &rvp); /* XXX */
  140         if (error) {
  141                 free(fmp, M_PORTALFSMNT);
  142                 free(pn, M_TEMP);
  143                 fdrop(fp, td);
  144                 return (error);
  145         }
  146 
  147         error = insmntque(rvp, mp);     /* XXX: Too early for mpsafe fs */
  148         if (error != 0) {
  149                 free(fmp, M_PORTALFSMNT);
  150                 free(pn, M_TEMP);
  151                 fdrop(fp, td);
  152                 return (error);
  153         }
  154         rvp->v_data = pn;
  155         rvp->v_type = VDIR;
  156         rvp->v_vflag |= VV_ROOT;
  157         VTOPORTAL(rvp)->pt_arg = 0;
  158         VTOPORTAL(rvp)->pt_size = 0;
  159         VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
  160         fmp->pm_root = rvp;
  161         fhold(fp);
  162         fmp->pm_server = fp;
  163 
  164         MNT_ILOCK(mp);
  165         mp->mnt_flag |= MNT_LOCAL;
  166         MNT_IUNLOCK(mp);
  167         mp->mnt_data =  fmp;
  168         vfs_getnewfsid(mp);
  169 
  170         vfs_mountedfrom(mp, p);
  171         fdrop(fp, td);
  172         return (0);
  173 }
  174 
  175 static int
  176 portal_unmount(mp, mntflags)
  177         struct mount *mp;
  178         int mntflags;
  179 {
  180         int error, flags = 0;
  181 
  182 
  183         if (mntflags & MNT_FORCE)
  184                 flags |= FORCECLOSE;
  185 
  186         /*
  187          * Clear out buffer cache.  I don't think we
  188          * ever get anything cached at this level at the
  189          * moment, but who knows...
  190          */
  191 #ifdef notyet
  192         mntflushbuf(mp, 0);
  193         if (mntinvalbuf(mp, 1))
  194                 return (EBUSY);
  195 #endif
  196         /* There is 1 extra root vnode reference (pm_root). */
  197         error = vflush(mp, 1, flags, curthread);
  198         if (error)
  199                 return (error);
  200 
  201         /*
  202          * Shutdown the socket.  This will cause the select in the
  203          * daemon to wake up, and then the accept will get ECONNABORTED
  204          * which it interprets as a request to go and bury itself.
  205          */
  206         soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2);
  207         /*
  208          * Discard reference to underlying file.  Must call closef because
  209          * this may be the last reference.
  210          */
  211         closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0);
  212         /*
  213          * Finally, throw away the portalmount structure
  214          */
  215         free(mp->mnt_data, M_PORTALFSMNT);      /* XXX */
  216         mp->mnt_data = 0;
  217         return (0);
  218 }
  219 
  220 static int
  221 portal_root(mp, flags, vpp)
  222         struct mount *mp;
  223         int flags;
  224         struct vnode **vpp;
  225 {
  226         struct vnode *vp;
  227 
  228         /*
  229          * Return locked reference to root.
  230          */
  231         vp = VFSTOPORTAL(mp)->pm_root;
  232         VREF(vp);
  233         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
  234         *vpp = vp;
  235         return (0);
  236 }
  237 
  238 static int
  239 portal_statfs(mp, sbp)
  240         struct mount *mp;
  241         struct statfs *sbp;
  242 {
  243 
  244         sbp->f_flags = 0;
  245         sbp->f_bsize = DEV_BSIZE;
  246         sbp->f_iosize = DEV_BSIZE;
  247         sbp->f_blocks = 2;              /* 1K to keep df happy */
  248         sbp->f_bfree = 0;
  249         sbp->f_bavail = 0;
  250         sbp->f_files = 1;               /* Allow for "." */
  251         sbp->f_ffree = 0;               /* See comments above */
  252         return (0);
  253 }
  254 
  255 static struct vfsops portal_vfsops = {
  256         .vfs_cmount =           portal_cmount,
  257         .vfs_mount =            portal_mount,
  258         .vfs_root =             portal_root,
  259         .vfs_statfs =           portal_statfs,
  260         .vfs_unmount =          portal_unmount,
  261 };
  262 
  263 VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC);

Cache object: 6c1b28c6521895cc81942a09b3efd056


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