d9b2d9f7a2
these filesystems will support shared locks until they are explicitly modified to do so. Careful review must be done to ensure that this is safe for each individual filesystem. Sponsored by: Isilon Systems, Inc.
250 lines
6.2 KiB
C
250 lines
6.2 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95
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*
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* $FreeBSD$
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*/
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/*
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* Portal Filesystem
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/domain.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <sys/file.h> /* Must come after sys/malloc.h */
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/vnode.h>
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#include <fs/portalfs/portal.h>
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static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
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static vfs_unmount_t portal_unmount;
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static vfs_root_t portal_root;
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static vfs_statfs_t portal_statfs;
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static const char *portal_opts[] = {
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"socket", "config",
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NULL
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};
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static int
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portal_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
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{
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struct portal_args args;
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int error;
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if (data == NULL)
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return (EINVAL);
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error = copyin(data, &args, sizeof args);
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if (error)
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return (error);
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ma = mount_argf(ma, "socket", "%d", args.pa_socket);
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ma = mount_argsu(ma, "config", args.pa_config, MAXPATHLEN);
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error = kernel_mount(ma, flags);
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return (error);
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}
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/*
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* Mount the per-process file descriptors (/dev/fd)
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*/
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static int
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portal_mount(struct mount *mp, struct thread *td)
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{
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struct file *fp;
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struct portalmount *fmp;
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struct socket *so;
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struct vnode *rvp;
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struct portalnode *pn;
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int error, v;
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char *p;
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if (vfs_filteropt(mp->mnt_optnew, portal_opts))
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return (EINVAL);
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error = vfs_scanopt(mp->mnt_optnew, "socket", "%d", &v);
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if (error != 1)
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return (EINVAL);
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error = vfs_getopt(mp->mnt_optnew, "config", (void **)&p, NULL);
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if (error)
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return (error);
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if ((error = fget(td, v, &fp)) != 0)
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return (error);
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if (fp->f_type != DTYPE_SOCKET) {
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fdrop(fp, td);
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return(ENOTSOCK);
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}
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so = fp->f_data; /* XXX race against userland */
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if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
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fdrop(fp, td);
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return (ESOCKTNOSUPPORT);
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}
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MALLOC(pn, struct portalnode *, sizeof(struct portalnode),
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M_TEMP, M_WAITOK);
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MALLOC(fmp, struct portalmount *, sizeof(struct portalmount),
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M_PORTALFSMNT, M_WAITOK); /* XXX */
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error = getnewvnode("portal", mp, &portal_vnodeops, &rvp); /* XXX */
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if (error) {
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FREE(fmp, M_PORTALFSMNT);
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FREE(pn, M_TEMP);
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fdrop(fp, td);
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return (error);
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}
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rvp->v_data = pn;
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rvp->v_type = VDIR;
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rvp->v_vflag |= VV_ROOT;
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VTOPORTAL(rvp)->pt_arg = 0;
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VTOPORTAL(rvp)->pt_size = 0;
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VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
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fmp->pm_root = rvp;
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fhold(fp);
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fmp->pm_server = fp;
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = (qaddr_t) fmp;
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vfs_getnewfsid(mp);
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vfs_mountedfrom(mp, p);
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fdrop(fp, td);
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return (0);
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}
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static int
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portal_unmount(mp, mntflags, td)
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struct mount *mp;
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int mntflags;
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struct thread *td;
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{
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int error, flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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/*
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* Clear out buffer cache. I don't think we
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* ever get anything cached at this level at the
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* moment, but who knows...
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*/
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#ifdef notyet
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mntflushbuf(mp, 0);
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if (mntinvalbuf(mp, 1))
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return (EBUSY);
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#endif
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/* There is 1 extra root vnode reference (pm_root). */
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error = vflush(mp, 1, flags, td);
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if (error)
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return (error);
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/*
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* Shutdown the socket. This will cause the select in the
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* daemon to wake up, and then the accept will get ECONNABORTED
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* which it interprets as a request to go and bury itself.
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*/
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soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2);
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/*
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* Discard reference to underlying file. Must call closef because
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* this may be the last reference.
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*/
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closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0);
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/*
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* Finally, throw away the portalmount structure
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*/
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free(mp->mnt_data, M_PORTALFSMNT); /* XXX */
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mp->mnt_data = 0;
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return (0);
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}
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static int
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portal_root(mp, flags, vpp, td)
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struct mount *mp;
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int flags;
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struct vnode **vpp;
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struct thread *td;
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{
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struct vnode *vp;
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/*
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* Return locked reference to root.
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*/
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vp = VFSTOPORTAL(mp)->pm_root;
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VREF(vp);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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*vpp = vp;
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return (0);
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}
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static int
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portal_statfs(mp, sbp, td)
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struct mount *mp;
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struct statfs *sbp;
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struct thread *td;
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{
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sbp->f_flags = 0;
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sbp->f_bsize = DEV_BSIZE;
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sbp->f_iosize = DEV_BSIZE;
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sbp->f_blocks = 2; /* 1K to keep df happy */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = 1; /* Allow for "." */
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sbp->f_ffree = 0; /* See comments above */
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return (0);
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}
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static struct vfsops portal_vfsops = {
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.vfs_cmount = portal_cmount,
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.vfs_mount = portal_mount,
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.vfs_root = portal_root,
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.vfs_statfs = portal_statfs,
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.vfs_unmount = portal_unmount,
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};
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VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC);
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