587 lines
16 KiB
C
587 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1994, 1995 The Regents of the University of California.
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* Copyright (c) 1994, 1995 Jan-Simon Pendry.
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* Copyright (c) 2005, 2006, 2012 Masanori Ozawa <ozawa@ongs.co.jp>, ONGS Inc.
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* Copyright (c) 2006, 2012 Daichi Goto <daichi@freebsd.org>
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* 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. 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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* @(#)union_vfsops.c 8.20 (Berkeley) 5/20/95
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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/kdb.h>
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#include <sys/fcntl.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/namei.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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#include <fs/unionfs/union.h>
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static MALLOC_DEFINE(M_UNIONFSMNT, "UNIONFS mount", "UNIONFS mount structure");
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static vfs_fhtovp_t unionfs_fhtovp;
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static vfs_checkexp_t unionfs_checkexp;
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static vfs_mount_t unionfs_domount;
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static vfs_quotactl_t unionfs_quotactl;
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static vfs_root_t unionfs_root;
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static vfs_sync_t unionfs_sync;
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static vfs_statfs_t unionfs_statfs;
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static vfs_unmount_t unionfs_unmount;
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static vfs_vget_t unionfs_vget;
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static vfs_extattrctl_t unionfs_extattrctl;
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static struct vfsops unionfs_vfsops;
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/*
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* Mount unionfs layer.
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*/
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static int
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unionfs_domount(struct mount *mp)
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{
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struct mount *lowermp, *uppermp;
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struct vnode *lowerrootvp;
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struct vnode *upperrootvp;
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struct unionfs_mount *ump;
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char *target;
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char *tmp;
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char *ep;
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struct nameidata nd, *ndp;
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struct vattr va;
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unionfs_copymode copymode;
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unionfs_whitemode whitemode;
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int below;
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int error;
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int len;
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uid_t uid;
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gid_t gid;
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u_short udir;
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u_short ufile;
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UNIONFSDEBUG("unionfs_mount(mp = %p)\n", mp);
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error = 0;
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below = 0;
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uid = 0;
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gid = 0;
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udir = 0;
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ufile = 0;
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copymode = UNIONFS_TRANSPARENT; /* default */
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whitemode = UNIONFS_WHITE_ALWAYS;
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ndp = &nd;
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if (mp->mnt_flag & MNT_ROOTFS) {
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vfs_mount_error(mp, "Cannot union mount root filesystem");
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return (EOPNOTSUPP);
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}
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/*
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* Update is a no operation.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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vfs_mount_error(mp, "unionfs does not support mount update");
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return (EOPNOTSUPP);
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}
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/*
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* Get argument
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*/
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error = vfs_getopt(mp->mnt_optnew, "target", (void **)&target, &len);
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if (error)
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error = vfs_getopt(mp->mnt_optnew, "from", (void **)&target,
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&len);
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if (error || target[len - 1] != '\0') {
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vfs_mount_error(mp, "Invalid target");
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return (EINVAL);
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}
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if (vfs_getopt(mp->mnt_optnew, "below", NULL, NULL) == 0)
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below = 1;
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if (vfs_getopt(mp->mnt_optnew, "udir", (void **)&tmp, NULL) == 0) {
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if (tmp != NULL)
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udir = (mode_t)strtol(tmp, &ep, 8);
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if (tmp == NULL || *ep) {
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vfs_mount_error(mp, "Invalid udir");
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return (EINVAL);
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}
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udir &= S_IRWXU | S_IRWXG | S_IRWXO;
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}
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if (vfs_getopt(mp->mnt_optnew, "ufile", (void **)&tmp, NULL) == 0) {
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if (tmp != NULL)
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ufile = (mode_t)strtol(tmp, &ep, 8);
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if (tmp == NULL || *ep) {
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vfs_mount_error(mp, "Invalid ufile");
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return (EINVAL);
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}
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ufile &= S_IRWXU | S_IRWXG | S_IRWXO;
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}
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/* check umask, uid and gid */
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if (udir == 0 && ufile != 0)
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udir = ufile;
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if (ufile == 0 && udir != 0)
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ufile = udir;
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vn_lock(mp->mnt_vnodecovered, LK_SHARED | LK_RETRY);
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error = VOP_GETATTR(mp->mnt_vnodecovered, &va, mp->mnt_cred);
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if (!error) {
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if (udir == 0)
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udir = va.va_mode;
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if (ufile == 0)
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ufile = va.va_mode;
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uid = va.va_uid;
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gid = va.va_gid;
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}
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VOP_UNLOCK(mp->mnt_vnodecovered);
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if (error)
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return (error);
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if (mp->mnt_cred->cr_ruid == 0) { /* root only */
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if (vfs_getopt(mp->mnt_optnew, "uid", (void **)&tmp,
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NULL) == 0) {
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if (tmp != NULL)
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uid = (uid_t)strtol(tmp, &ep, 10);
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if (tmp == NULL || *ep) {
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vfs_mount_error(mp, "Invalid uid");
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return (EINVAL);
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}
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}
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if (vfs_getopt(mp->mnt_optnew, "gid", (void **)&tmp,
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NULL) == 0) {
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if (tmp != NULL)
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gid = (gid_t)strtol(tmp, &ep, 10);
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if (tmp == NULL || *ep) {
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vfs_mount_error(mp, "Invalid gid");
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return (EINVAL);
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}
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}
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if (vfs_getopt(mp->mnt_optnew, "copymode", (void **)&tmp,
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NULL) == 0) {
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if (tmp == NULL) {
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vfs_mount_error(mp, "Invalid copymode");
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return (EINVAL);
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} else if (strcasecmp(tmp, "traditional") == 0)
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copymode = UNIONFS_TRADITIONAL;
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else if (strcasecmp(tmp, "transparent") == 0)
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copymode = UNIONFS_TRANSPARENT;
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else if (strcasecmp(tmp, "masquerade") == 0)
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copymode = UNIONFS_MASQUERADE;
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else {
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vfs_mount_error(mp, "Invalid copymode");
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return (EINVAL);
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}
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}
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if (vfs_getopt(mp->mnt_optnew, "whiteout", (void **)&tmp,
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NULL) == 0) {
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if (tmp == NULL) {
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vfs_mount_error(mp, "Invalid whiteout mode");
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return (EINVAL);
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} else if (strcasecmp(tmp, "always") == 0)
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whitemode = UNIONFS_WHITE_ALWAYS;
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else if (strcasecmp(tmp, "whenneeded") == 0)
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whitemode = UNIONFS_WHITE_WHENNEEDED;
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else {
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vfs_mount_error(mp, "Invalid whiteout mode");
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return (EINVAL);
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}
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}
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}
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/* If copymode is UNIONFS_TRADITIONAL, uid/gid is mounted user. */
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if (copymode == UNIONFS_TRADITIONAL) {
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uid = mp->mnt_cred->cr_ruid;
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gid = mp->mnt_cred->cr_rgid;
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}
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UNIONFSDEBUG("unionfs_mount: uid=%d, gid=%d\n", uid, gid);
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UNIONFSDEBUG("unionfs_mount: udir=0%03o, ufile=0%03o\n", udir, ufile);
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UNIONFSDEBUG("unionfs_mount: copymode=%d\n", copymode);
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/*
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* Find upper node
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*/
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NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, target);
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if ((error = namei(ndp)))
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return (error);
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NDFREE_PNBUF(ndp);
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/* get root vnodes */
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lowerrootvp = mp->mnt_vnodecovered;
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upperrootvp = ndp->ni_vp;
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KASSERT(lowerrootvp != NULL, ("%s: NULL lower root vp", __func__));
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KASSERT(upperrootvp != NULL, ("%s: NULL upper root vp", __func__));
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/* create unionfs_mount */
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ump = malloc(sizeof(struct unionfs_mount), M_UNIONFSMNT,
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M_WAITOK | M_ZERO);
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/*
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* Save reference
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*/
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if (below) {
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VOP_UNLOCK(upperrootvp);
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vn_lock(lowerrootvp, LK_EXCLUSIVE | LK_RETRY);
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ump->um_lowervp = upperrootvp;
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ump->um_uppervp = lowerrootvp;
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} else {
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ump->um_lowervp = lowerrootvp;
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ump->um_uppervp = upperrootvp;
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}
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ump->um_rootvp = NULLVP;
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ump->um_uid = uid;
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ump->um_gid = gid;
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ump->um_udir = udir;
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ump->um_ufile = ufile;
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ump->um_copymode = copymode;
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ump->um_whitemode = whitemode;
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mp->mnt_data = ump;
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/*
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* Copy upper layer's RDONLY flag.
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*/
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mp->mnt_flag |= ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY;
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/*
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* Unlock the node
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*/
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VOP_UNLOCK(ump->um_uppervp);
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/*
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* Get the unionfs root vnode.
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*/
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error = unionfs_nodeget(mp, ump->um_uppervp, ump->um_lowervp,
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NULLVP, &(ump->um_rootvp), NULL);
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if (error != 0) {
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vrele(upperrootvp);
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free(ump, M_UNIONFSMNT);
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mp->mnt_data = NULL;
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return (error);
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}
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KASSERT(ump->um_rootvp != NULL, ("rootvp cannot be NULL"));
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KASSERT((ump->um_rootvp->v_vflag & VV_ROOT) != 0,
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("%s: rootvp without VV_ROOT", __func__));
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/*
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* Do not release the namei() reference on upperrootvp until after
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* we attempt to register the upper mounts. A concurrent unmount
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* of the upper or lower FS may have caused unionfs_nodeget() to
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* create a unionfs node with a NULL upper or lower vp and with
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* no reference held on upperrootvp or lowerrootvp.
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* vfs_register_upper() should subsequently fail, which is what
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* we want, but we must ensure neither underlying vnode can be
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* reused until that happens. We assume the caller holds a reference
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* to lowerrootvp as it is the mount's covered vnode.
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*/
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lowermp = vfs_register_upper_from_vp(ump->um_lowervp, mp,
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&ump->um_lower_link);
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uppermp = vfs_register_upper_from_vp(ump->um_uppervp, mp,
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&ump->um_upper_link);
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vrele(upperrootvp);
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if (lowermp == NULL || uppermp == NULL) {
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if (lowermp != NULL)
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vfs_unregister_upper(lowermp, &ump->um_lower_link);
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if (uppermp != NULL)
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vfs_unregister_upper(uppermp, &ump->um_upper_link);
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vflush(mp, 1, FORCECLOSE, curthread);
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free(ump, M_UNIONFSMNT);
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mp->mnt_data = NULL;
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return (ENOENT);
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}
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/*
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* Specify that the covered vnode lock should remain held while
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* lookup() performs the cross-mount walk. This prevents a lock-order
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* reversal between the covered vnode lock (which is also locked by
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* unionfs_lock()) and the mountpoint's busy count. Without this,
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* unmount will lock the covered vnode lock (directly through the
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* covered vnode) and wait for the busy count to drain, while a
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* concurrent lookup will increment the busy count and then lock
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* the covered vnode lock (indirectly through unionfs_lock()).
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*
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* Note that we can't yet use this facility for the 'below' case
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* in which the upper vnode is the covered vnode, because that would
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* introduce a different LOR in which the cross-mount lookup would
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* effectively hold the upper vnode lock before acquiring the lower
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* vnode lock, while an unrelated lock operation would still acquire
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* the lower vnode lock before the upper vnode lock, which is the
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* order unionfs currently requires.
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*/
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if (!below) {
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vn_lock(mp->mnt_vnodecovered, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE);
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mp->mnt_vnodecovered->v_vflag |= VV_CROSSLOCK;
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VOP_UNLOCK(mp->mnt_vnodecovered);
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}
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MNT_ILOCK(mp);
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if ((lowermp->mnt_flag & MNT_LOCAL) != 0 &&
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(uppermp->mnt_flag & MNT_LOCAL) != 0)
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_kern_flag |= MNTK_NOMSYNC | MNTK_UNIONFS;
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MNT_IUNLOCK(mp);
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/*
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* Get new fsid
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*/
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vfs_getnewfsid(mp);
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snprintf(mp->mnt_stat.f_mntfromname, MNAMELEN, "<%s>:%s",
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below ? "below" : "above", target);
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UNIONFSDEBUG("unionfs_mount: from %s, on %s\n",
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mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
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return (0);
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}
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/*
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* Free reference to unionfs layer
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*/
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static int
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unionfs_unmount(struct mount *mp, int mntflags)
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{
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struct unionfs_mount *ump;
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int error;
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int num;
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int freeing;
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int flags;
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UNIONFSDEBUG("unionfs_unmount: mp = %p\n", mp);
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ump = MOUNTTOUNIONFSMOUNT(mp);
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flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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/* vflush (no need to call vrele) */
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for (freeing = 0; (error = vflush(mp, 1, flags, curthread)) != 0;) {
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num = mp->mnt_nvnodelistsize;
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if (num == freeing)
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break;
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freeing = num;
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}
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if (error)
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return (error);
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vn_lock(mp->mnt_vnodecovered, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE);
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mp->mnt_vnodecovered->v_vflag &= ~VV_CROSSLOCK;
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VOP_UNLOCK(mp->mnt_vnodecovered);
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vfs_unregister_upper(ump->um_lowervp->v_mount, &ump->um_lower_link);
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vfs_unregister_upper(ump->um_uppervp->v_mount, &ump->um_upper_link);
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free(ump, M_UNIONFSMNT);
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mp->mnt_data = NULL;
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return (0);
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}
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static int
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unionfs_root(struct mount *mp, int flags, struct vnode **vpp)
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{
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struct unionfs_mount *ump;
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struct vnode *vp;
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ump = MOUNTTOUNIONFSMOUNT(mp);
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vp = ump->um_rootvp;
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UNIONFSDEBUG("unionfs_root: rootvp=%p locked=%x\n",
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vp, VOP_ISLOCKED(vp));
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vref(vp);
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if (flags & LK_TYPE_MASK)
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vn_lock(vp, flags);
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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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unionfs_quotactl(struct mount *mp, int cmd, uid_t uid, void *arg,
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bool *mp_busy)
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{
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struct mount *uppermp;
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struct unionfs_mount *ump;
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int error;
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bool unbusy;
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ump = MOUNTTOUNIONFSMOUNT(mp);
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uppermp = atomic_load_ptr(&ump->um_uppervp->v_mount);
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KASSERT(*mp_busy == true, ("upper mount not busy"));
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/*
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* See comment in sys_quotactl() for an explanation of why the
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* lower mount needs to be busied by the caller of VFS_QUOTACTL()
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* but may be unbusied by the implementation. We must unbusy
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* the upper mount for the same reason; otherwise a namei lookup
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* issued by the VFS_QUOTACTL() implementation could traverse the
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* upper mount and deadlock.
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*/
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vfs_unbusy(mp);
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*mp_busy = false;
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unbusy = true;
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error = vfs_busy(uppermp, 0);
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/*
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* Writing is always performed to upper vnode.
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*/
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if (error == 0)
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error = VFS_QUOTACTL(uppermp, cmd, uid, arg, &unbusy);
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if (unbusy)
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vfs_unbusy(uppermp);
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return (error);
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}
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static int
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unionfs_statfs(struct mount *mp, struct statfs *sbp)
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{
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struct unionfs_mount *ump;
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struct statfs *mstat;
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uint64_t lbsize;
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int error;
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ump = MOUNTTOUNIONFSMOUNT(mp);
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UNIONFSDEBUG("unionfs_statfs(mp = %p, lvp = %p, uvp = %p)\n",
|
|
mp, ump->um_lowervp, ump->um_uppervp);
|
|
|
|
mstat = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK | M_ZERO);
|
|
|
|
error = VFS_STATFS(ump->um_lowervp->v_mount, mstat);
|
|
if (error) {
|
|
free(mstat, M_STATFS);
|
|
return (error);
|
|
}
|
|
|
|
/* now copy across the "interesting" information and fake the rest */
|
|
sbp->f_blocks = mstat->f_blocks;
|
|
sbp->f_files = mstat->f_files;
|
|
|
|
lbsize = mstat->f_bsize;
|
|
|
|
error = VFS_STATFS(ump->um_uppervp->v_mount, mstat);
|
|
if (error) {
|
|
free(mstat, M_STATFS);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* The FS type etc is copy from upper vfs.
|
|
* (write able vfs have priority)
|
|
*/
|
|
sbp->f_type = mstat->f_type;
|
|
sbp->f_flags = mstat->f_flags;
|
|
sbp->f_bsize = mstat->f_bsize;
|
|
sbp->f_iosize = mstat->f_iosize;
|
|
|
|
if (mstat->f_bsize != lbsize)
|
|
sbp->f_blocks = ((off_t)sbp->f_blocks * lbsize) /
|
|
mstat->f_bsize;
|
|
|
|
sbp->f_blocks += mstat->f_blocks;
|
|
sbp->f_bfree = mstat->f_bfree;
|
|
sbp->f_bavail = mstat->f_bavail;
|
|
sbp->f_files += mstat->f_files;
|
|
sbp->f_ffree = mstat->f_ffree;
|
|
|
|
free(mstat, M_STATFS);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
unionfs_sync(struct mount *mp, int waitfor)
|
|
{
|
|
/* nothing to do */
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
unionfs_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
static int
|
|
unionfs_fhtovp(struct mount *mp, struct fid *fidp, int flags,
|
|
struct vnode **vpp)
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
static int
|
|
unionfs_checkexp(struct mount *mp, struct sockaddr *nam, uint64_t *extflagsp,
|
|
struct ucred **credanonp, int *numsecflavors, int *secflavors)
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
static int
|
|
unionfs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
|
|
int namespace, const char *attrname)
|
|
{
|
|
struct unionfs_mount *ump;
|
|
struct unionfs_node *unp;
|
|
|
|
ump = MOUNTTOUNIONFSMOUNT(mp);
|
|
unp = VTOUNIONFS(filename_vp);
|
|
|
|
if (unp->un_uppervp != NULLVP) {
|
|
return (VFS_EXTATTRCTL(ump->um_uppervp->v_mount, cmd,
|
|
unp->un_uppervp, namespace, attrname));
|
|
} else {
|
|
return (VFS_EXTATTRCTL(ump->um_lowervp->v_mount, cmd,
|
|
unp->un_lowervp, namespace, attrname));
|
|
}
|
|
}
|
|
|
|
static struct vfsops unionfs_vfsops = {
|
|
.vfs_checkexp = unionfs_checkexp,
|
|
.vfs_extattrctl = unionfs_extattrctl,
|
|
.vfs_fhtovp = unionfs_fhtovp,
|
|
.vfs_init = unionfs_init,
|
|
.vfs_mount = unionfs_domount,
|
|
.vfs_quotactl = unionfs_quotactl,
|
|
.vfs_root = unionfs_root,
|
|
.vfs_statfs = unionfs_statfs,
|
|
.vfs_sync = unionfs_sync,
|
|
.vfs_uninit = unionfs_uninit,
|
|
.vfs_unmount = unionfs_unmount,
|
|
.vfs_vget = unionfs_vget,
|
|
};
|
|
|
|
VFS_SET(unionfs_vfsops, unionfs, VFCF_LOOPBACK);
|