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
455 lines
11 KiB
C
455 lines
11 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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* the UCLA Ficus project.
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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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* @(#)umap_vfsops.c 8.8 (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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* Umap Layer
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* (See mount_umap(8) for a description of this layer.)
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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/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <miscfs/umapfs/umap.h>
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static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure");
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static int umapfs_fhtovp __P((struct mount *mp, struct fid *fidp,
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struct vnode **vpp));
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static int umapfs_checkexp __P((struct mount *mp, struct sockaddr *nam,
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int *extflagsp, struct ucred **credanonp));
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static int umapfs_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 umapfs_quotactl __P((struct mount *mp, int cmd, uid_t uid,
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caddr_t arg, struct proc *p));
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static int umapfs_root __P((struct mount *mp, struct vnode **vpp));
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static int umapfs_start __P((struct mount *mp, int flags, struct proc *p));
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static int umapfs_statfs __P((struct mount *mp, struct statfs *sbp,
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struct proc *p));
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static int umapfs_sync __P((struct mount *mp, int waitfor,
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struct ucred *cred, struct proc *p));
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static int umapfs_unmount __P((struct mount *mp, int mntflags,
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struct proc *p));
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static int umapfs_vget __P((struct mount *mp, ino_t ino,
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struct vnode **vpp));
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static int umapfs_vptofh __P((struct vnode *vp, struct fid *fhp));
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static int umapfs_extattrctl __P((struct mount *mp, int cmd,
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struct vnode *filename_vp,
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int namespace, const char *attrname,
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struct proc *p));
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/*
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* Mount umap layer
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*/
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static int
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umapfs_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 umap_args args;
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struct vnode *lowerrootvp, *vp;
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struct vnode *umapm_rootvp;
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struct umap_mount *amp;
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u_int size;
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int error;
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#ifdef DEBUG
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int i;
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#endif
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/*
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* Only for root
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*/
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if ((error = suser(p)) != 0)
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return (error);
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#ifdef DEBUG
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printf("umapfs_mount(mp = %p)\n", (void *)mp);
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#endif
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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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/* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/
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}
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/*
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* Get argument
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*/
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error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
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if (error)
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return (error);
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/*
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* Find lower node
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*/
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NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
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UIO_USERSPACE, args.target, p);
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error = namei(ndp);
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if (error)
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return (error);
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NDFREE(ndp, NDF_ONLY_PNBUF);
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/*
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* Sanity check on lower vnode
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*/
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lowerrootvp = ndp->ni_vp;
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#ifdef DEBUG
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printf("vp = %p, check for VDIR...\n", (void *)lowerrootvp);
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#endif
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vrele(ndp->ni_dvp);
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ndp->ni_dvp = 0;
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if (lowerrootvp->v_type != VDIR) {
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vput(lowerrootvp);
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return (EINVAL);
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}
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#ifdef DEBUG
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printf("mp = %p\n", (void *)mp);
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#endif
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amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
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M_UMAPFSMNT, M_WAITOK); /* XXX */
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/*
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* Save reference to underlying FS
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*/
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amp->umapm_vfs = lowerrootvp->v_mount;
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/*
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* Now copy in the number of entries and maps for umap mapping.
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*/
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amp->info_nentries = args.nentries;
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amp->info_gnentries = args.gnentries;
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error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
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2*sizeof(u_long)*args.nentries);
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if (error)
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return (error);
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#ifdef DEBUG
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printf("umap_mount:nentries %d\n",args.nentries);
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for (i = 0; i < args.nentries; i++)
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printf(" %lu maps to %lu\n", amp->info_mapdata[i][0],
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amp->info_mapdata[i][1]);
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#endif
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error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
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2*sizeof(u_long)*args.gnentries);
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if (error)
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return (error);
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#ifdef DEBUG
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printf("umap_mount:gnentries %d\n",args.gnentries);
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for (i = 0; i < args.gnentries; i++)
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printf(" group %lu maps to %lu\n",
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amp->info_gmapdata[i][0],
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amp->info_gmapdata[i][1]);
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#endif
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/*
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* Save reference. Each mount also holds
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* a reference on the root vnode.
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*/
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error = umap_node_create(mp, lowerrootvp, &vp);
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/*
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* Unlock the node (either the lower or the alias)
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*/
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VOP_UNLOCK(vp, 0, p);
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/*
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* Make sure the node alias worked
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*/
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if (error) {
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vrele(lowerrootvp);
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free(amp, M_UMAPFSMNT); /* XXX */
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return (error);
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}
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/*
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* Keep a held reference to the root vnode.
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* It is vrele'd in umapfs_unmount.
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*/
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umapm_rootvp = vp;
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umapm_rootvp->v_flag |= VROOT;
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amp->umapm_rootvp = umapm_rootvp;
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if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = (qaddr_t) amp;
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vfs_getnewfsid(mp);
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(void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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(void)umapfs_statfs(mp, &mp->mnt_stat, p);
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#ifdef DEBUG
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printf("umapfs_mount: lower %s, alias at %s\n",
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mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
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#endif
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return (0);
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}
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/*
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* VFS start. Nothing needed here - the start routine
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* on the underlying filesystem will have been called
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* when that filesystem was mounted.
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*/
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static int
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umapfs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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return (0);
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/* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
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}
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/*
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* Free reference to umap layer
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*/
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static int
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umapfs_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;
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int flags = 0;
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#ifdef DEBUG
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printf("umapfs_unmount(mp = %p)\n", (void *)mp);
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#endif
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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 (umapm_rootvp). */
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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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* Finally, throw away the umap_mount structure
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*/
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free(mp->mnt_data, M_UMAPFSMNT); /* 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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umapfs_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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#ifdef DEBUG
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printf("umapfs_root(mp = %p, vp = %p->%p)\n",
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(void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
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(void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
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#endif
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/*
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* Return locked reference to root.
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*/
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vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
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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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umapfs_quotactl(mp, cmd, uid, arg, p)
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struct mount *mp;
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int cmd;
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uid_t uid;
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caddr_t arg;
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struct proc *p;
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{
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return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p));
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}
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static int
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umapfs_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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int error;
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struct statfs mstat;
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#ifdef DEBUG
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printf("umapfs_statfs(mp = %p, vp = %p->%p)\n",
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(void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
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(void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
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#endif
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bzero(&mstat, sizeof(mstat));
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error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p);
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if (error)
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return (error);
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/* now copy across the "interesting" information and fake the rest */
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sbp->f_type = mstat.f_type;
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sbp->f_flags = mstat.f_flags;
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sbp->f_bsize = mstat.f_bsize;
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sbp->f_iosize = mstat.f_iosize;
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sbp->f_blocks = mstat.f_blocks;
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sbp->f_bfree = mstat.f_bfree;
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sbp->f_bavail = mstat.f_bavail;
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sbp->f_files = mstat.f_files;
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sbp->f_ffree = mstat.f_ffree;
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if (sbp != &mp->mnt_stat) {
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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 int
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umapfs_sync(mp, waitfor, cred, p)
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struct mount *mp;
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int waitfor;
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struct ucred *cred;
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struct proc *p;
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{
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/*
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* XXX - Assumes no data cached at umap layer.
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*/
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return (0);
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}
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static int
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umapfs_vget(mp, ino, vpp)
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struct mount *mp;
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ino_t ino;
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struct vnode **vpp;
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{
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return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
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}
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static int
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umapfs_fhtovp(mp, fidp, vpp)
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struct mount *mp;
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struct fid *fidp;
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struct vnode **vpp;
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{
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return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, vpp));
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}
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static int
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umapfs_checkexp(mp, nam, exflagsp, credanonp)
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struct mount *mp;
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struct sockaddr *nam;
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int *exflagsp;
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struct ucred **credanonp;
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{
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return (VFS_CHECKEXP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, nam,
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exflagsp, credanonp));
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}
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static int
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umapfs_vptofh(vp, fhp)
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struct vnode *vp;
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struct fid *fhp;
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{
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return (VFS_VPTOFH(UMAPVPTOLOWERVP(vp), fhp));
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}
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static int
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umapfs_extattrctl(mp, cmd, filename_vp, namespace, attrname, p)
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struct mount *mp;
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int cmd;
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struct vnode *filename_vp;
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int namespace;
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const char *attrname;
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struct proc *p;
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{
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return (VFS_EXTATTRCTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd,
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filename_vp, namespace, attrname, p));
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}
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static struct vfsops umap_vfsops = {
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umapfs_mount,
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umapfs_start,
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umapfs_unmount,
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umapfs_root,
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umapfs_quotactl,
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umapfs_statfs,
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umapfs_sync,
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umapfs_vget,
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umapfs_fhtovp,
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umapfs_checkexp,
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umapfs_vptofh,
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umapfs_init,
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vfs_stduninit,
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umapfs_extattrctl,
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};
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VFS_SET(umap_vfsops, umap, VFCF_LOOPBACK);
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