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  * 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: releng/5.2/sys/fs/portalfs/portal_vfsops.c 116271 2003-06-12 20:48:38Z phk $
   39  */
   40 
   41 /*
   42  * Portal Filesystem
   43  */
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/domain.h>
   48 #include <sys/filedesc.h>
   49 #include <sys/kernel.h>
   50 #include <sys/lock.h>
   51 #include <sys/mutex.h>
   52 #include <sys/malloc.h>
   53 #include <sys/file.h>           /* Must come after sys/malloc.h */
   54 #include <sys/mount.h>
   55 #include <sys/proc.h>
   56 #include <sys/protosw.h>
   57 #include <sys/socket.h>
   58 #include <sys/socketvar.h>
   59 #include <sys/vnode.h>
   60 
   61 #include <fs/portalfs/portal.h>
   62 
   63 static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
   64 
   65 static vfs_mount_t      portal_mount;
   66 static vfs_unmount_t    portal_unmount;
   67 static vfs_root_t       portal_root;
   68 static vfs_statfs_t     portal_statfs;
   69 
   70 /*
   71  * Mount the per-process file descriptors (/dev/fd)
   72  */
   73 static int
   74 portal_mount(mp, path, data, ndp, td)
   75         struct mount *mp;
   76         char *path;
   77         caddr_t data;
   78         struct nameidata *ndp;
   79         struct thread *td;
   80 {
   81         struct file *fp;
   82         struct portal_args args;
   83         struct portalmount *fmp;
   84         struct socket *so;
   85         struct vnode *rvp;
   86         struct portalnode *pn;
   87         size_t size;
   88         int error;
   89 
   90         /*
   91          * Update is a no-op
   92          */
   93         if (mp->mnt_flag & MNT_UPDATE)
   94                 return (EOPNOTSUPP);
   95 
   96         error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
   97         if (error)
   98                 return (error);
   99 
  100         if ((error = fget(td, args.pa_socket, &fp)) != 0)
  101                 return (error);
  102         if (fp->f_type != DTYPE_SOCKET) {
  103                 fdrop(fp, td);
  104                 return(ENOTSOCK);
  105         }
  106         so = fp->f_data;        /* XXX race against userland */
  107         if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
  108                 fdrop(fp, td);
  109                 return (ESOCKTNOSUPPORT);
  110         }
  111 
  112         MALLOC(pn, struct portalnode *, sizeof(struct portalnode),
  113                 M_TEMP, M_WAITOK);
  114 
  115         MALLOC(fmp, struct portalmount *, sizeof(struct portalmount),
  116                 M_PORTALFSMNT, M_WAITOK);       /* XXX */
  117 
  118         error = getnewvnode("portal", mp, portal_vnodeop_p, &rvp); /* XXX */
  119         if (error) {
  120                 FREE(fmp, M_PORTALFSMNT);
  121                 FREE(pn, M_TEMP);
  122                 fdrop(fp, td);
  123                 return (error);
  124         }
  125 
  126         rvp->v_data = pn;
  127         rvp->v_type = VDIR;
  128         rvp->v_vflag |= VV_ROOT;
  129         VTOPORTAL(rvp)->pt_arg = 0;
  130         VTOPORTAL(rvp)->pt_size = 0;
  131         VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
  132         fmp->pm_root = rvp;
  133         fhold(fp);
  134         fmp->pm_server = fp;
  135 
  136         mp->mnt_flag |= MNT_LOCAL;
  137         mp->mnt_data = (qaddr_t) fmp;
  138         vfs_getnewfsid(mp);
  139 
  140         (void)copyinstr(args.pa_config,
  141             mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
  142         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
  143 
  144 #ifdef notdef
  145         bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
  146         bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
  147 #endif
  148 
  149         (void)portal_statfs(mp, &mp->mnt_stat, td);
  150         fdrop(fp, td);
  151         return (0);
  152 }
  153 
  154 static int
  155 portal_unmount(mp, mntflags, td)
  156         struct mount *mp;
  157         int mntflags;
  158         struct thread *td;
  159 {
  160         int error, flags = 0;
  161 
  162 
  163         if (mntflags & MNT_FORCE)
  164                 flags |= FORCECLOSE;
  165 
  166         /*
  167          * Clear out buffer cache.  I don't think we
  168          * ever get anything cached at this level at the
  169          * moment, but who knows...
  170          */
  171 #ifdef notyet
  172         mntflushbuf(mp, 0);
  173         if (mntinvalbuf(mp, 1))
  174                 return (EBUSY);
  175 #endif
  176         /* There is 1 extra root vnode reference (pm_root). */
  177         error = vflush(mp, 1, flags);
  178         if (error)
  179                 return (error);
  180 
  181         /*
  182          * Shutdown the socket.  This will cause the select in the
  183          * daemon to wake up, and then the accept will get ECONNABORTED
  184          * which it interprets as a request to go and bury itself.
  185          */
  186         soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2);
  187         /*
  188          * Discard reference to underlying file.  Must call closef because
  189          * this may be the last reference.
  190          */
  191         closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0);
  192         /*
  193          * Finally, throw away the portalmount structure
  194          */
  195         free(mp->mnt_data, M_PORTALFSMNT);      /* XXX */
  196         mp->mnt_data = 0;
  197         return (0);
  198 }
  199 
  200 static int
  201 portal_root(mp, vpp)
  202         struct mount *mp;
  203         struct vnode **vpp;
  204 {
  205         struct thread *td = curthread;  /* XXX */
  206         struct vnode *vp;
  207 
  208         /*
  209          * Return locked reference to root.
  210          */
  211         vp = VFSTOPORTAL(mp)->pm_root;
  212         VREF(vp);
  213         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
  214         *vpp = vp;
  215         return (0);
  216 }
  217 
  218 static int
  219 portal_statfs(mp, sbp, td)
  220         struct mount *mp;
  221         struct statfs *sbp;
  222         struct thread *td;
  223 {
  224 
  225         sbp->f_flags = 0;
  226         sbp->f_bsize = DEV_BSIZE;
  227         sbp->f_iosize = DEV_BSIZE;
  228         sbp->f_blocks = 2;              /* 1K to keep df happy */
  229         sbp->f_bfree = 0;
  230         sbp->f_bavail = 0;
  231         sbp->f_files = 1;               /* Allow for "." */
  232         sbp->f_ffree = 0;               /* See comments above */
  233         if (sbp != &mp->mnt_stat) {
  234                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
  235                 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
  236                 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
  237                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
  238         }
  239         return (0);
  240 }
  241 
  242 static struct vfsops portal_vfsops = {
  243         .vfs_mount =            portal_mount,
  244         .vfs_root =             portal_root,
  245         .vfs_statfs =           portal_statfs,
  246         .vfs_unmount =          portal_unmount,
  247 };
  248 
  249 VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC);

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

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