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  * $FreeBSD$
   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_omount_t     portal_omount;
   62 static vfs_unmount_t    portal_unmount;
   63 static vfs_root_t       portal_root;
   64 static vfs_statfs_t     portal_statfs;
   65 
   66 /*
   67  * Mount the per-process file descriptors (/dev/fd)
   68  */
   69 static int
   70 portal_omount(mp, path, data, td)
   71         struct mount *mp;
   72         char *path;
   73         caddr_t data;
   74         struct thread *td;
   75 {
   76         struct file *fp;
   77         struct portal_args args;
   78         struct portalmount *fmp;
   79         struct socket *so;
   80         struct vnode *rvp;
   81         struct portalnode *pn;
   82         size_t size;
   83         int error;
   84 
   85         /*
   86          * Update is a no-op
   87          */
   88         if (mp->mnt_flag & MNT_UPDATE)
   89                 return (EOPNOTSUPP);
   90 
   91         error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
   92         if (error)
   93                 return (error);
   94 
   95         if ((error = fget(td, args.pa_socket, &fp)) != 0)
   96                 return (error);
   97         if (fp->f_type != DTYPE_SOCKET) {
   98                 fdrop(fp, td);
   99                 return(ENOTSOCK);
  100         }
  101         so = fp->f_data;        /* XXX race against userland */
  102         if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
  103                 fdrop(fp, td);
  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         error = getnewvnode("portal", mp, portal_vnodeop_p, &rvp); /* XXX */
  114         if (error) {
  115                 FREE(fmp, M_PORTALFSMNT);
  116                 FREE(pn, M_TEMP);
  117                 fdrop(fp, td);
  118                 return (error);
  119         }
  120 
  121         rvp->v_data = pn;
  122         rvp->v_type = VDIR;
  123         rvp->v_vflag |= VV_ROOT;
  124         VTOPORTAL(rvp)->pt_arg = 0;
  125         VTOPORTAL(rvp)->pt_size = 0;
  126         VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
  127         fmp->pm_root = rvp;
  128         fhold(fp);
  129         fmp->pm_server = fp;
  130 
  131         mp->mnt_flag |= MNT_LOCAL;
  132         mp->mnt_data = (qaddr_t) fmp;
  133         vfs_getnewfsid(mp);
  134 
  135         (void)copyinstr(args.pa_config,
  136             mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
  137         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
  138 
  139 #ifdef notdef
  140         bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
  141         bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
  142 #endif
  143 
  144         (void)portal_statfs(mp, &mp->mnt_stat, td);
  145         fdrop(fp, td);
  146         return (0);
  147 }
  148 
  149 static int
  150 portal_unmount(mp, mntflags, td)
  151         struct mount *mp;
  152         int mntflags;
  153         struct thread *td;
  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, td);
  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(VFSTOPORTAL(mp)->pm_server->f_data, 2);
  182         /*
  183          * Discard reference to underlying file.  Must call closef because
  184          * this may be the last reference.
  185          */
  186         closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0);
  187         /*
  188          * Finally, throw away the portalmount structure
  189          */
  190         free(mp->mnt_data, M_PORTALFSMNT);      /* XXX */
  191         mp->mnt_data = 0;
  192         return (0);
  193 }
  194 
  195 static int
  196 portal_root(mp, vpp, td)
  197         struct mount *mp;
  198         struct vnode **vpp;
  199         struct thread *td;
  200 {
  201         struct vnode *vp;
  202 
  203         /*
  204          * Return locked reference to root.
  205          */
  206         vp = VFSTOPORTAL(mp)->pm_root;
  207         VREF(vp);
  208         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
  209         *vpp = vp;
  210         return (0);
  211 }
  212 
  213 static int
  214 portal_statfs(mp, sbp, td)
  215         struct mount *mp;
  216         struct statfs *sbp;
  217         struct thread *td;
  218 {
  219 
  220         sbp->f_flags = 0;
  221         sbp->f_bsize = DEV_BSIZE;
  222         sbp->f_iosize = DEV_BSIZE;
  223         sbp->f_blocks = 2;              /* 1K to keep df happy */
  224         sbp->f_bfree = 0;
  225         sbp->f_bavail = 0;
  226         sbp->f_files = 1;               /* Allow for "." */
  227         sbp->f_ffree = 0;               /* See comments above */
  228         if (sbp != &mp->mnt_stat) {
  229                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
  230                 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
  231                 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
  232                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
  233         }
  234         return (0);
  235 }
  236 
  237 static struct vfsops portal_vfsops = {
  238         .vfs_omount =           portal_omount,
  239         .vfs_root =             portal_root,
  240         .vfs_statfs =           portal_statfs,
  241         .vfs_unmount =          portal_unmount,
  242 };
  243 
  244 VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC);

Cache object: 3017c9fb0f36d239ac829be699d3aebd


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