0864ef1e8a
the number of references on the filesystem root vnode to be both expected and released. Many filesystems hold an extra reference on the filesystem root vnode, which must be accounted for when determining if the filesystem is busy and then released if it isn't busy. The old `skipvp' approach required individual filesystem xxx_unmount functions to re-implement much of vflush()'s logic to deal with the root vnode. All 9 filesystems that hold an extra reference on the root vnode got the logic wrong in the case of forced unmounts, so `umount -f' would always fail if there were any extra root vnode references. Fix this issue centrally in vflush(), now that we can. This commit also fixes a vnode reference leak in devfs, which could result in idle devfs filesystems that refuse to unmount. Reviewed by: phk, bp
258 lines
6.8 KiB
C
258 lines
6.8 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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/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 <miscfs/portal/portal.h>
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static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
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static int portal_mount __P((struct mount *mp, char *path, caddr_t data,
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struct nameidata *ndp, struct proc *p));
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static int portal_unmount __P((struct mount *mp, int mntflags,
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struct proc *p));
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static int portal_root __P((struct mount *mp, struct vnode **vpp));
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static int portal_statfs __P((struct mount *mp, struct statfs *sbp,
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struct proc *p));
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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(mp, path, data, ndp, p)
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struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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struct file *fp;
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struct portal_args args;
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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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u_int size;
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int error;
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/*
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* Update is a no-op
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*/
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
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if (error)
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return (error);
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error = holdsock(p->p_fd, args.pa_socket, &fp);
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if (error)
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return (error);
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so = (struct socket *) fp->f_data;
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if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
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fdrop(fp, p);
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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(VT_PORTAL, mp, portal_vnodeop_p, &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, p);
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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_flag |= VROOT;
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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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fmp->pm_server = fp; fp->f_count++;
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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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(void)copyinstr(args.pa_config,
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mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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#ifdef notdef
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bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
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bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
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#endif
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(void)portal_statfs(mp, &mp->mnt_stat, p);
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fdrop(fp, p);
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return (0);
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}
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static int
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portal_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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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);
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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((struct socket *) 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 proc *) 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, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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struct proc *p = curproc; /* XXX */
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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, p);
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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, p)
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struct mount *mp;
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struct statfs *sbp;
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struct proc *p;
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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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if (sbp != &mp->mnt_stat) {
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sbp->f_type = mp->mnt_vfc->vfc_typenum;
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bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
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bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
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}
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return (0);
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}
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static struct vfsops portal_vfsops = {
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portal_mount,
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vfs_stdstart,
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portal_unmount,
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portal_root,
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vfs_stdquotactl,
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portal_statfs,
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vfs_stdsync,
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vfs_stdvget,
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vfs_stdfhtovp,
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vfs_stdcheckexp,
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vfs_stdvptofh,
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vfs_stdinit,
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vfs_stduninit,
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vfs_stdextattrctl,
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};
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VFS_SET(portal_vfsops, portal, VFCF_SYNTHETIC);
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