ba8e255297
options for ext2fs. Now that we use nmount() directly from the mount binary to access ext2fs filesystems, add the list of acceptable mount options to ext2_ops, so that vfs_filteropts() will accept options like "noatime" for ext2fs. PR: 105483 Noticed by: Dr. Markus Waldeck <waldeck gmx de> MFC after: 1 month
1171 lines
31 KiB
C
1171 lines
31 KiB
C
/*-
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* modified for EXT2FS support in Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*/
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/*-
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* Copyright (c) 1989, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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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* @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
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* $FreeBSD$
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*/
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/*-
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* COPYRIGHT.INFO says this has some GPL'd code from ext2_super.c in it
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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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/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h>
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#include <sys/stat.h>
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#include <sys/mutex.h>
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#include <geom/geom.h>
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#include <geom/geom_vfs.h>
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#include <gnu/fs/ext2fs/ext2_mount.h>
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#include <gnu/fs/ext2fs/inode.h>
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#include <gnu/fs/ext2fs/fs.h>
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#include <gnu/fs/ext2fs/ext2_extern.h>
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#include <gnu/fs/ext2fs/ext2_fs.h>
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#include <gnu/fs/ext2fs/ext2_fs_sb.h>
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static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
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static int ext2_mountfs(struct vnode *, struct mount *, struct thread *);
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static int ext2_reload(struct mount *mp, struct thread *td);
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static int ext2_sbupdate(struct ext2mount *, int);
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static vfs_unmount_t ext2_unmount;
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static vfs_root_t ext2_root;
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static vfs_statfs_t ext2_statfs;
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static vfs_sync_t ext2_sync;
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static vfs_vget_t ext2_vget;
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static vfs_fhtovp_t ext2_fhtovp;
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static vfs_vptofh_t ext2_vptofh;
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static vfs_mount_t ext2_mount;
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MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
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static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
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static struct vfsops ext2fs_vfsops = {
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.vfs_fhtovp = ext2_fhtovp,
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.vfs_mount = ext2_mount,
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.vfs_root = ext2_root, /* root inode via vget */
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.vfs_statfs = ext2_statfs,
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.vfs_sync = ext2_sync,
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.vfs_unmount = ext2_unmount,
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.vfs_vget = ext2_vget,
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.vfs_vptofh = ext2_vptofh,
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};
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VFS_SET(ext2fs_vfsops, ext2fs, 0);
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#define bsd_malloc malloc
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#define bsd_free free
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static int ext2_check_sb_compat(struct ext2_super_block *es, struct cdev *dev,
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int ronly);
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static int compute_sb_data(struct vnode * devvp,
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struct ext2_super_block * es, struct ext2_sb_info * fs);
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static const char *ext2_opts[] = { "from", "export", "union", "acls", "exec",
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"atime", "union", "suiddir", "multilabel", "symfollow", "clusterr",
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"clusterw" };
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/*
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* VFS Operations.
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*
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* mount system call
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*/
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static int
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ext2_mount(mp, td)
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struct mount *mp;
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struct thread *td;
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{
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struct vfsoptlist *opts;
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struct vnode *devvp;
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struct ext2mount *ump = 0;
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struct ext2_sb_info *fs;
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char *path, *fspec;
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int error, flags, len;
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mode_t accessmode;
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struct nameidata nd, *ndp = &nd;
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opts = mp->mnt_optnew;
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if (vfs_filteropt(opts, ext2_opts))
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return (EINVAL);
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vfs_getopt(opts, "fspath", (void **)&path, NULL);
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/* Double-check the length of path.. */
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if (strlen(path) >= MAXMNTLEN - 1)
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return (ENAMETOOLONG);
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fspec = NULL;
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error = vfs_getopt(opts, "from", (void **)&fspec, &len);
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if (!error && fspec[len - 1] != '\0')
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return (EINVAL);
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/*
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* If updating, check whether changing from read-only to
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* read/write; if there is no device name, that's all we do.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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ump = VFSTOEXT2(mp);
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fs = ump->um_e2fs;
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error = 0;
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if (fs->s_rd_only == 0 &&
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vfs_flagopt(opts, "ro", NULL, 0)) {
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error = VFS_SYNC(mp, MNT_WAIT, td);
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if (error)
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return (error);
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flags = WRITECLOSE;
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if (mp->mnt_flag & MNT_FORCE)
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flags |= FORCECLOSE;
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if (vfs_busy(mp, LK_NOWAIT, 0, td))
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return (EBUSY);
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error = ext2_flushfiles(mp, flags, td);
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vfs_unbusy(mp, td);
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if (!error && fs->s_wasvalid) {
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fs->s_es->s_state |= EXT2_VALID_FS;
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ext2_sbupdate(ump, MNT_WAIT);
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}
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fs->s_rd_only = 1;
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vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
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DROP_GIANT();
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g_topology_lock();
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g_access(ump->um_cp, 0, -1, 0);
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g_topology_unlock();
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PICKUP_GIANT();
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}
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if (!error && (mp->mnt_flag & MNT_RELOAD))
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error = ext2_reload(mp, td);
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if (error)
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return (error);
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devvp = ump->um_devvp;
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if (fs->s_rd_only && !vfs_flagopt(opts, "ro", NULL, 0)) {
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if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev, 0))
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return (EPERM);
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/*
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* If upgrade to read-write by non-root, then verify
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* that user has necessary permissions on the device.
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*/
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
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error = VOP_ACCESS(devvp, VREAD | VWRITE,
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td->td_ucred, td);
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if (error)
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error = priv_check(td, PRIV_VFS_MOUNT_PERM);
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if (error) {
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VOP_UNLOCK(devvp, 0, td);
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return (error);
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}
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VOP_UNLOCK(devvp, 0, td);
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DROP_GIANT();
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g_topology_lock();
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error = g_access(ump->um_cp, 0, 1, 0);
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g_topology_unlock();
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PICKUP_GIANT();
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if (error)
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return (error);
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if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 ||
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(fs->s_es->s_state & EXT2_ERROR_FS)) {
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if (mp->mnt_flag & MNT_FORCE) {
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printf(
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"WARNING: %s was not properly dismounted\n",
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fs->fs_fsmnt);
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} else {
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printf(
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"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
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fs->fs_fsmnt);
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return (EPERM);
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}
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}
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fs->s_es->s_state &= ~EXT2_VALID_FS;
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ext2_sbupdate(ump, MNT_WAIT);
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fs->s_rd_only = 0;
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MNT_ILOCK(mp);
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mp->mnt_flag &= ~MNT_RDONLY;
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MNT_IUNLOCK(mp);
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}
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if (vfs_flagopt(opts, "export", NULL, 0)) {
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/* Process export requests in vfs_mount.c. */
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return (error);
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}
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}
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/*
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* Not an update, or updating the name: look up the name
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* and verify that it refers to a sensible disk device.
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*/
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if (fspec == NULL)
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return (EINVAL);
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NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
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if ((error = namei(ndp)) != 0)
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return (error);
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NDFREE(ndp, NDF_ONLY_PNBUF);
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devvp = ndp->ni_vp;
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if (!vn_isdisk(devvp, &error)) {
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vput(devvp);
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return (error);
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}
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/*
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* If mount by non-root, then verify that user has necessary
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* permissions on the device.
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*
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* XXXRW: VOP_ACCESS() enough?
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*/
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accessmode = VREAD;
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if ((mp->mnt_flag & MNT_RDONLY) == 0)
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accessmode |= VWRITE;
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error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td);
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if (error)
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error = priv_check(td, PRIV_VFS_MOUNT_PERM);
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if (error) {
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vput(devvp);
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return (error);
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}
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if ((mp->mnt_flag & MNT_UPDATE) == 0) {
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error = ext2_mountfs(devvp, mp, td);
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} else {
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if (devvp != ump->um_devvp) {
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vput(devvp);
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return (EINVAL); /* needs translation */
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} else
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vput(devvp);
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}
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if (error) {
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vrele(devvp);
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return (error);
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}
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ump = VFSTOEXT2(mp);
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fs = ump->um_e2fs;
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/*
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* Note that this strncpy() is ok because of a check at the start
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* of ext2_mount().
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*/
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strncpy(fs->fs_fsmnt, path, MAXMNTLEN);
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fs->fs_fsmnt[MAXMNTLEN - 1] = '\0';
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vfs_mountedfrom(mp, fspec);
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return (0);
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}
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|
|
/*
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* checks that the data in the descriptor blocks make sense
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* this is taken from ext2/super.c
|
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*/
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static int ext2_check_descriptors (struct ext2_sb_info * sb)
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{
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int i;
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int desc_block = 0;
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unsigned long block = sb->s_es->s_first_data_block;
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struct ext2_group_desc * gdp = NULL;
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/* ext2_debug ("Checking group descriptors"); */
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for (i = 0; i < sb->s_groups_count; i++)
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{
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/* examine next descriptor block */
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if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
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gdp = (struct ext2_group_desc *)
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sb->s_group_desc[desc_block++]->b_data;
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if (gdp->bg_block_bitmap < block ||
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gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
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{
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printf ("ext2_check_descriptors: "
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"Block bitmap for group %d"
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" not in group (block %lu)!\n",
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i, (unsigned long) gdp->bg_block_bitmap);
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return 0;
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}
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if (gdp->bg_inode_bitmap < block ||
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gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
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{
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printf ("ext2_check_descriptors: "
|
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"Inode bitmap for group %d"
|
|
" not in group (block %lu)!\n",
|
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i, (unsigned long) gdp->bg_inode_bitmap);
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return 0;
|
|
}
|
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if (gdp->bg_inode_table < block ||
|
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gdp->bg_inode_table + sb->s_itb_per_group >=
|
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block + EXT2_BLOCKS_PER_GROUP(sb))
|
|
{
|
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printf ("ext2_check_descriptors: "
|
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"Inode table for group %d"
|
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" not in group (block %lu)!\n",
|
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i, (unsigned long) gdp->bg_inode_table);
|
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return 0;
|
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}
|
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block += EXT2_BLOCKS_PER_GROUP(sb);
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gdp++;
|
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}
|
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return 1;
|
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}
|
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|
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static int
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ext2_check_sb_compat(es, dev, ronly)
|
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struct ext2_super_block *es;
|
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struct cdev *dev;
|
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int ronly;
|
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{
|
|
|
|
if (es->s_magic != EXT2_SUPER_MAGIC) {
|
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printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
|
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devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC);
|
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return (1);
|
|
}
|
|
if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
|
|
if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
|
|
printf(
|
|
"WARNING: mount of %s denied due to unsupported optional features\n",
|
|
devtoname(dev));
|
|
return (1);
|
|
}
|
|
if (!ronly &&
|
|
(es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
|
|
printf(
|
|
"WARNING: R/W mount of %s denied due to unsupported optional features\n",
|
|
devtoname(dev));
|
|
return (1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* this computes the fields of the ext2_sb_info structure from the
|
|
* data in the ext2_super_block structure read in
|
|
*/
|
|
static int compute_sb_data(devvp, es, fs)
|
|
struct vnode * devvp;
|
|
struct ext2_super_block * es;
|
|
struct ext2_sb_info * fs;
|
|
{
|
|
int db_count, error;
|
|
int i, j;
|
|
int logic_sb_block = 1; /* XXX for now */
|
|
|
|
#if 1
|
|
#define V(v)
|
|
#else
|
|
#define V(v) printf(#v"= %d\n", fs->v);
|
|
#endif
|
|
|
|
fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
|
|
V(s_blocksize)
|
|
fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size;
|
|
V(s_bshift)
|
|
fs->s_fsbtodb = es->s_log_block_size + 1;
|
|
V(s_fsbtodb)
|
|
fs->s_qbmask = fs->s_blocksize - 1;
|
|
V(s_bmask)
|
|
fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es);
|
|
V(s_blocksize_bits)
|
|
fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size;
|
|
V(s_frag_size)
|
|
if (fs->s_frag_size)
|
|
fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size;
|
|
V(s_frags_per_block)
|
|
fs->s_blocks_per_group = es->s_blocks_per_group;
|
|
V(s_blocks_per_group)
|
|
fs->s_frags_per_group = es->s_frags_per_group;
|
|
V(s_frags_per_group)
|
|
fs->s_inodes_per_group = es->s_inodes_per_group;
|
|
V(s_inodes_per_group)
|
|
fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE;
|
|
V(s_inodes_per_block)
|
|
fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block;
|
|
V(s_itb_per_group)
|
|
fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc);
|
|
V(s_desc_per_block)
|
|
/* s_resuid / s_resgid ? */
|
|
fs->s_groups_count = (es->s_blocks_count -
|
|
es->s_first_data_block +
|
|
EXT2_BLOCKS_PER_GROUP(fs) - 1) /
|
|
EXT2_BLOCKS_PER_GROUP(fs);
|
|
V(s_groups_count)
|
|
db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) /
|
|
EXT2_DESC_PER_BLOCK(fs);
|
|
fs->s_db_per_group = db_count;
|
|
V(s_db_per_group)
|
|
|
|
fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *),
|
|
M_EXT2MNT, M_WAITOK);
|
|
|
|
/* adjust logic_sb_block */
|
|
if(fs->s_blocksize > SBSIZE)
|
|
/* Godmar thinks: if the blocksize is greater than 1024, then
|
|
the superblock is logically part of block zero.
|
|
*/
|
|
logic_sb_block = 0;
|
|
|
|
for (i = 0; i < db_count; i++) {
|
|
error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1),
|
|
fs->s_blocksize, NOCRED, &fs->s_group_desc[i]);
|
|
if(error) {
|
|
for (j = 0; j < i; j++)
|
|
brelse(fs->s_group_desc[j]);
|
|
bsd_free(fs->s_group_desc, M_EXT2MNT);
|
|
printf("EXT2-fs: unable to read group descriptors (%d)\n", error);
|
|
return EIO;
|
|
}
|
|
LCK_BUF(fs->s_group_desc[i])
|
|
}
|
|
if(!ext2_check_descriptors(fs)) {
|
|
for (j = 0; j < db_count; j++)
|
|
ULCK_BUF(fs->s_group_desc[j])
|
|
bsd_free(fs->s_group_desc, M_EXT2MNT);
|
|
printf("EXT2-fs: (ext2_check_descriptors failure) "
|
|
"unable to read group descriptors\n");
|
|
return EIO;
|
|
}
|
|
|
|
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
|
|
fs->s_inode_bitmap_number[i] = 0;
|
|
fs->s_inode_bitmap[i] = NULL;
|
|
fs->s_block_bitmap_number[i] = 0;
|
|
fs->s_block_bitmap[i] = NULL;
|
|
}
|
|
fs->s_loaded_inode_bitmaps = 0;
|
|
fs->s_loaded_block_bitmaps = 0;
|
|
if (es->s_rev_level == EXT2_GOOD_OLD_REV || (es->s_feature_ro_compat &
|
|
EXT2_FEATURE_RO_COMPAT_LARGE_FILE) == 0)
|
|
fs->fs_maxfilesize = 0x7fffffff;
|
|
else
|
|
fs->fs_maxfilesize = 0x7fffffffffffffff;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reload all incore data for a filesystem (used after running fsck on
|
|
* the root filesystem and finding things to fix). The filesystem must
|
|
* be mounted read-only.
|
|
*
|
|
* Things to do to update the mount:
|
|
* 1) invalidate all cached meta-data.
|
|
* 2) re-read superblock from disk.
|
|
* 3) re-read summary information from disk.
|
|
* 4) invalidate all inactive vnodes.
|
|
* 5) invalidate all cached file data.
|
|
* 6) re-read inode data for all active vnodes.
|
|
*/
|
|
static int
|
|
ext2_reload(struct mount *mp, struct thread *td)
|
|
{
|
|
struct vnode *vp, *mvp, *devvp;
|
|
struct inode *ip;
|
|
struct buf *bp;
|
|
struct ext2_super_block * es;
|
|
struct ext2_sb_info *fs;
|
|
int error;
|
|
|
|
if ((mp->mnt_flag & MNT_RDONLY) == 0)
|
|
return (EINVAL);
|
|
/*
|
|
* Step 1: invalidate all cached meta-data.
|
|
*/
|
|
devvp = VFSTOEXT2(mp)->um_devvp;
|
|
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
if (vinvalbuf(devvp, 0, td, 0, 0) != 0)
|
|
panic("ext2_reload: dirty1");
|
|
VOP_UNLOCK(devvp, 0, td);
|
|
|
|
/*
|
|
* Step 2: re-read superblock from disk.
|
|
* constants have been adjusted for ext2
|
|
*/
|
|
if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
|
|
return (error);
|
|
es = (struct ext2_super_block *)bp->b_data;
|
|
if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
|
|
brelse(bp);
|
|
return (EIO); /* XXX needs translation */
|
|
}
|
|
fs = VFSTOEXT2(mp)->um_e2fs;
|
|
bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block));
|
|
|
|
if((error = compute_sb_data(devvp, es, fs)) != 0) {
|
|
brelse(bp);
|
|
return error;
|
|
}
|
|
#ifdef UNKLAR
|
|
if (fs->fs_sbsize < SBSIZE)
|
|
bp->b_flags |= B_INVAL;
|
|
#endif
|
|
brelse(bp);
|
|
|
|
loop:
|
|
MNT_ILOCK(mp);
|
|
MNT_VNODE_FOREACH(vp, mp, mvp) {
|
|
VI_LOCK(vp);
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
VI_UNLOCK(vp);
|
|
continue;
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
/*
|
|
* Step 4: invalidate all cached file data.
|
|
*/
|
|
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
|
|
MNT_VNODE_FOREACH_ABORT(mp, mvp);
|
|
goto loop;
|
|
}
|
|
if (vinvalbuf(vp, 0, td, 0, 0))
|
|
panic("ext2_reload: dirty2");
|
|
/*
|
|
* Step 5: re-read inode data for all active vnodes.
|
|
*/
|
|
ip = VTOI(vp);
|
|
error =
|
|
bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
|
|
(int)fs->s_blocksize, NOCRED, &bp);
|
|
if (error) {
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vrele(vp);
|
|
MNT_VNODE_FOREACH_ABORT(mp, mvp);
|
|
return (error);
|
|
}
|
|
ext2_ei2i((struct ext2_inode *) ((char *)bp->b_data +
|
|
EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)), ip);
|
|
brelse(bp);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vrele(vp);
|
|
MNT_ILOCK(mp);
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Common code for mount and mountroot
|
|
*/
|
|
static int
|
|
ext2_mountfs(devvp, mp, td)
|
|
struct vnode *devvp;
|
|
struct mount *mp;
|
|
struct thread *td;
|
|
{
|
|
struct ext2mount *ump;
|
|
struct buf *bp;
|
|
struct ext2_sb_info *fs;
|
|
struct ext2_super_block * es;
|
|
struct cdev *dev = devvp->v_rdev;
|
|
struct g_consumer *cp;
|
|
struct bufobj *bo;
|
|
int error;
|
|
int ronly;
|
|
|
|
ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
|
|
/* XXX: use VOP_ACESS to check FS perms */
|
|
DROP_GIANT();
|
|
g_topology_lock();
|
|
error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
|
|
g_topology_unlock();
|
|
PICKUP_GIANT();
|
|
VOP_UNLOCK(devvp, 0, td);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* XXX: should we check for some sectorsize or 512 instead? */
|
|
if (((SBSIZE % cp->provider->sectorsize) != 0) ||
|
|
(SBSIZE < cp->provider->sectorsize)) {
|
|
DROP_GIANT();
|
|
g_topology_lock();
|
|
g_vfs_close(cp, td);
|
|
g_topology_unlock();
|
|
PICKUP_GIANT();
|
|
return (EINVAL);
|
|
}
|
|
|
|
bo = &devvp->v_bufobj;
|
|
bo->bo_private = cp;
|
|
bo->bo_ops = g_vfs_bufops;
|
|
if (devvp->v_rdev->si_iosize_max != 0)
|
|
mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
|
|
if (mp->mnt_iosize_max > MAXPHYS)
|
|
mp->mnt_iosize_max = MAXPHYS;
|
|
|
|
bp = NULL;
|
|
ump = NULL;
|
|
if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
|
|
goto out;
|
|
es = (struct ext2_super_block *)bp->b_data;
|
|
if (ext2_check_sb_compat(es, dev, ronly) != 0) {
|
|
error = EINVAL; /* XXX needs translation */
|
|
goto out;
|
|
}
|
|
if ((es->s_state & EXT2_VALID_FS) == 0 ||
|
|
(es->s_state & EXT2_ERROR_FS)) {
|
|
if (ronly || (mp->mnt_flag & MNT_FORCE)) {
|
|
printf(
|
|
"WARNING: Filesystem was not properly dismounted\n");
|
|
} else {
|
|
printf(
|
|
"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n");
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
}
|
|
ump = bsd_malloc(sizeof *ump, M_EXT2MNT, M_WAITOK);
|
|
bzero((caddr_t)ump, sizeof *ump);
|
|
/* I don't know whether this is the right strategy. Note that
|
|
we dynamically allocate both an ext2_sb_info and an ext2_super_block
|
|
while Linux keeps the super block in a locked buffer
|
|
*/
|
|
ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info),
|
|
M_EXT2MNT, M_WAITOK);
|
|
ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block),
|
|
M_EXT2MNT, M_WAITOK);
|
|
bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block));
|
|
if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)))
|
|
goto out;
|
|
/*
|
|
* We don't free the group descriptors allocated by compute_sb_data()
|
|
* until ext2_unmount(). This is OK since the mount will succeed.
|
|
*/
|
|
brelse(bp);
|
|
bp = NULL;
|
|
fs = ump->um_e2fs;
|
|
fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */
|
|
/* if the fs is not mounted read-only, make sure the super block is
|
|
always written back on a sync()
|
|
*/
|
|
fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0;
|
|
if (ronly == 0) {
|
|
fs->s_dirt = 1; /* mark it modified */
|
|
fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */
|
|
}
|
|
mp->mnt_data = (qaddr_t)ump;
|
|
mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
|
|
mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
|
|
mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
|
|
MNT_ILOCK(mp);
|
|
mp->mnt_flag |= MNT_LOCAL;
|
|
MNT_IUNLOCK(mp);
|
|
ump->um_mountp = mp;
|
|
ump->um_dev = dev;
|
|
ump->um_devvp = devvp;
|
|
ump->um_bo = &devvp->v_bufobj;
|
|
ump->um_cp = cp;
|
|
/* setting those two parameters allowed us to use
|
|
ufs_bmap w/o changse !
|
|
*/
|
|
ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
|
|
ump->um_bptrtodb = fs->s_es->s_log_block_size + 1;
|
|
ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
|
|
if (ronly == 0)
|
|
ext2_sbupdate(ump, MNT_WAIT);
|
|
return (0);
|
|
out:
|
|
if (bp)
|
|
brelse(bp);
|
|
if (cp != NULL) {
|
|
DROP_GIANT();
|
|
g_topology_lock();
|
|
g_vfs_close(cp, td);
|
|
g_topology_unlock();
|
|
PICKUP_GIANT();
|
|
}
|
|
if (ump) {
|
|
bsd_free(ump->um_e2fs->s_es, M_EXT2MNT);
|
|
bsd_free(ump->um_e2fs, M_EXT2MNT);
|
|
bsd_free(ump, M_EXT2MNT);
|
|
mp->mnt_data = (qaddr_t)0;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* unmount system call
|
|
*/
|
|
static int
|
|
ext2_unmount(mp, mntflags, td)
|
|
struct mount *mp;
|
|
int mntflags;
|
|
struct thread *td;
|
|
{
|
|
struct ext2mount *ump;
|
|
struct ext2_sb_info *fs;
|
|
int error, flags, ronly, i;
|
|
|
|
flags = 0;
|
|
if (mntflags & MNT_FORCE) {
|
|
if (mp->mnt_flag & MNT_ROOTFS)
|
|
return (EINVAL);
|
|
flags |= FORCECLOSE;
|
|
}
|
|
if ((error = ext2_flushfiles(mp, flags, td)) != 0)
|
|
return (error);
|
|
ump = VFSTOEXT2(mp);
|
|
fs = ump->um_e2fs;
|
|
ronly = fs->s_rd_only;
|
|
if (ronly == 0) {
|
|
if (fs->s_wasvalid)
|
|
fs->s_es->s_state |= EXT2_VALID_FS;
|
|
ext2_sbupdate(ump, MNT_WAIT);
|
|
}
|
|
|
|
/* release buffers containing group descriptors */
|
|
for(i = 0; i < fs->s_db_per_group; i++)
|
|
ULCK_BUF(fs->s_group_desc[i])
|
|
bsd_free(fs->s_group_desc, M_EXT2MNT);
|
|
|
|
/* release cached inode/block bitmaps */
|
|
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
|
|
if (fs->s_inode_bitmap[i])
|
|
ULCK_BUF(fs->s_inode_bitmap[i])
|
|
|
|
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
|
|
if (fs->s_block_bitmap[i])
|
|
ULCK_BUF(fs->s_block_bitmap[i])
|
|
|
|
DROP_GIANT();
|
|
g_topology_lock();
|
|
g_vfs_close(ump->um_cp, td);
|
|
g_topology_unlock();
|
|
PICKUP_GIANT();
|
|
vrele(ump->um_devvp);
|
|
bsd_free(fs->s_es, M_EXT2MNT);
|
|
bsd_free(fs, M_EXT2MNT);
|
|
bsd_free(ump, M_EXT2MNT);
|
|
mp->mnt_data = (qaddr_t)0;
|
|
MNT_ILOCK(mp);
|
|
mp->mnt_flag &= ~MNT_LOCAL;
|
|
MNT_IUNLOCK(mp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Flush out all the files in a filesystem.
|
|
*/
|
|
static int
|
|
ext2_flushfiles(mp, flags, td)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
int error;
|
|
|
|
error = vflush(mp, 0, flags, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Get file system statistics.
|
|
* taken from ext2/super.c ext2_statfs
|
|
*/
|
|
static int
|
|
ext2_statfs(mp, sbp, td)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct thread *td;
|
|
{
|
|
unsigned long overhead;
|
|
struct ext2mount *ump;
|
|
struct ext2_sb_info *fs;
|
|
struct ext2_super_block *es;
|
|
int i, nsb;
|
|
|
|
ump = VFSTOEXT2(mp);
|
|
fs = ump->um_e2fs;
|
|
es = fs->s_es;
|
|
|
|
if (es->s_magic != EXT2_SUPER_MAGIC)
|
|
panic("ext2_statfs - magic number spoiled");
|
|
|
|
/*
|
|
* Compute the overhead (FS structures)
|
|
*/
|
|
if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) {
|
|
nsb = 0;
|
|
for (i = 0 ; i < fs->s_groups_count; i++)
|
|
if (ext2_group_sparse(i))
|
|
nsb++;
|
|
} else
|
|
nsb = fs->s_groups_count;
|
|
overhead = es->s_first_data_block +
|
|
/* Superblocks and block group descriptors: */
|
|
nsb * (1 + fs->s_db_per_group) +
|
|
/* Inode bitmap, block bitmap, and inode table: */
|
|
fs->s_groups_count * (1 + 1 + fs->s_itb_per_group);
|
|
|
|
sbp->f_bsize = EXT2_FRAG_SIZE(fs);
|
|
sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
|
|
sbp->f_blocks = es->s_blocks_count - overhead;
|
|
sbp->f_bfree = es->s_free_blocks_count;
|
|
sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count;
|
|
sbp->f_files = es->s_inodes_count;
|
|
sbp->f_ffree = es->s_free_inodes_count;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Go through the disk queues to initiate sandbagged IO;
|
|
* go through the inodes to write those that have been modified;
|
|
* initiate the writing of the super block if it has been modified.
|
|
*
|
|
* Note: we are always called with the filesystem marked `MPBUSY'.
|
|
*/
|
|
static int
|
|
ext2_sync(mp, waitfor, td)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *mvp, *vp;
|
|
struct inode *ip;
|
|
struct ext2mount *ump = VFSTOEXT2(mp);
|
|
struct ext2_sb_info *fs;
|
|
int error, allerror = 0;
|
|
|
|
fs = ump->um_e2fs;
|
|
if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */
|
|
printf("fs = %s\n", fs->fs_fsmnt);
|
|
panic("ext2_sync: rofs mod");
|
|
}
|
|
/*
|
|
* Write back each (modified) inode.
|
|
*/
|
|
MNT_ILOCK(mp);
|
|
loop:
|
|
MNT_VNODE_FOREACH(vp, mp, mvp) {
|
|
VI_LOCK(vp);
|
|
if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) {
|
|
VI_UNLOCK(vp);
|
|
continue;
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
ip = VTOI(vp);
|
|
if ((ip->i_flag &
|
|
(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
|
|
(vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
|
|
waitfor == MNT_LAZY)) {
|
|
VI_UNLOCK(vp);
|
|
MNT_ILOCK(mp);
|
|
continue;
|
|
}
|
|
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
|
|
if (error) {
|
|
MNT_ILOCK(mp);
|
|
if (error == ENOENT) {
|
|
MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
|
|
goto loop;
|
|
}
|
|
continue;
|
|
}
|
|
if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
|
|
allerror = error;
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vrele(vp);
|
|
MNT_ILOCK(mp);
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
/*
|
|
* Force stale file system control information to be flushed.
|
|
*/
|
|
if (waitfor != MNT_LAZY) {
|
|
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
|
|
allerror = error;
|
|
VOP_UNLOCK(ump->um_devvp, 0, td);
|
|
}
|
|
/*
|
|
* Write back modified superblock.
|
|
*/
|
|
if (fs->s_dirt != 0) {
|
|
fs->s_dirt = 0;
|
|
fs->s_es->s_wtime = time_second;
|
|
if ((error = ext2_sbupdate(ump, waitfor)) != 0)
|
|
allerror = error;
|
|
}
|
|
return (allerror);
|
|
}
|
|
|
|
/*
|
|
* Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
|
|
* in from disk. If it is in core, wait for the lock bit to clear, then
|
|
* return the inode locked. Detection and handling of mount points must be
|
|
* done by the calling routine.
|
|
*/
|
|
static int
|
|
ext2_vget(mp, ino, flags, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
int flags;
|
|
struct vnode **vpp;
|
|
{
|
|
struct ext2_sb_info *fs;
|
|
struct inode *ip;
|
|
struct ext2mount *ump;
|
|
struct buf *bp;
|
|
struct vnode *vp;
|
|
struct cdev *dev;
|
|
int i, error;
|
|
int used_blocks;
|
|
|
|
error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
|
|
if (error || *vpp != NULL)
|
|
return (error);
|
|
|
|
ump = VFSTOEXT2(mp);
|
|
dev = ump->um_dev;
|
|
|
|
/*
|
|
* If this MALLOC() is performed after the getnewvnode()
|
|
* it might block, leaving a vnode with a NULL v_data to be
|
|
* found by ext2_sync() if a sync happens to fire right then,
|
|
* which will cause a panic because ext2_sync() blindly
|
|
* dereferences vp->v_data (as well it should).
|
|
*/
|
|
ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
|
|
|
|
/* Allocate a new vnode/inode. */
|
|
if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
|
|
*vpp = NULL;
|
|
free(ip, M_EXT2NODE);
|
|
return (error);
|
|
}
|
|
vp->v_data = ip;
|
|
ip->i_vnode = vp;
|
|
ip->i_e2fs = fs = ump->um_e2fs;
|
|
ip->i_number = ino;
|
|
|
|
error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL);
|
|
if (error || *vpp != NULL)
|
|
return (error);
|
|
|
|
/* Read in the disk contents for the inode, copy into the inode. */
|
|
#if 0
|
|
printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino)));
|
|
#endif
|
|
if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
|
|
(int)fs->s_blocksize, NOCRED, &bp)) != 0) {
|
|
/*
|
|
* The inode does not contain anything useful, so it would
|
|
* be misleading to leave it on its hash chain. With mode
|
|
* still zero, it will be unlinked and returned to the free
|
|
* list by vput().
|
|
*/
|
|
vput(vp);
|
|
brelse(bp);
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
/* convert ext2 inode to dinode */
|
|
ext2_ei2i((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE *
|
|
ino_to_fsbo(fs, ino)), ip);
|
|
ip->i_block_group = ino_to_cg(fs, ino);
|
|
ip->i_next_alloc_block = 0;
|
|
ip->i_next_alloc_goal = 0;
|
|
ip->i_prealloc_count = 0;
|
|
ip->i_prealloc_block = 0;
|
|
/* now we want to make sure that block pointers for unused
|
|
blocks are zeroed out - ext2_balloc depends on this
|
|
although for regular files and directories only
|
|
*/
|
|
if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
|
|
used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize;
|
|
for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
|
|
ip->i_db[i] = 0;
|
|
}
|
|
/*
|
|
ext2_print_inode(ip);
|
|
*/
|
|
brelse(bp);
|
|
|
|
/*
|
|
* Initialize the vnode from the inode, check for aliases.
|
|
* Note that the underlying vnode may have changed.
|
|
*/
|
|
if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
|
|
vput(vp);
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
/*
|
|
* Finish inode initialization now that aliasing has been resolved.
|
|
*/
|
|
ip->i_devvp = ump->um_devvp;
|
|
/*
|
|
* Set up a generation number for this inode if it does not
|
|
* already have one. This should only happen on old filesystems.
|
|
*/
|
|
if (ip->i_gen == 0) {
|
|
ip->i_gen = random() / 2 + 1;
|
|
if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
|
|
ip->i_flag |= IN_MODIFIED;
|
|
}
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* File handle to vnode
|
|
*
|
|
* Have to be really careful about stale file handles:
|
|
* - check that the inode number is valid
|
|
* - call ext2_vget() to get the locked inode
|
|
* - check for an unallocated inode (i_mode == 0)
|
|
* - check that the given client host has export rights and return
|
|
* those rights via. exflagsp and credanonp
|
|
*/
|
|
static int
|
|
ext2_fhtovp(mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
struct inode *ip;
|
|
struct ufid *ufhp;
|
|
struct vnode *nvp;
|
|
struct ext2_sb_info *fs;
|
|
int error;
|
|
|
|
ufhp = (struct ufid *)fhp;
|
|
fs = VFSTOEXT2(mp)->um_e2fs;
|
|
if (ufhp->ufid_ino < ROOTINO ||
|
|
ufhp->ufid_ino > fs->s_groups_count * fs->s_es->s_inodes_per_group)
|
|
return (ESTALE);
|
|
|
|
error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
|
|
if (error) {
|
|
*vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
ip = VTOI(nvp);
|
|
if (ip->i_mode == 0 ||
|
|
ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
|
|
vput(nvp);
|
|
*vpp = NULLVP;
|
|
return (ESTALE);
|
|
}
|
|
*vpp = nvp;
|
|
vnode_create_vobject(*vpp, 0, curthread);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode pointer to File handle
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
ext2_vptofh(vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
struct inode *ip;
|
|
struct ufid *ufhp;
|
|
|
|
ip = VTOI(vp);
|
|
ufhp = (struct ufid *)fhp;
|
|
ufhp->ufid_len = sizeof(struct ufid);
|
|
ufhp->ufid_ino = ip->i_number;
|
|
ufhp->ufid_gen = ip->i_gen;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Write a superblock and associated information back to disk.
|
|
*/
|
|
static int
|
|
ext2_sbupdate(mp, waitfor)
|
|
struct ext2mount *mp;
|
|
int waitfor;
|
|
{
|
|
struct ext2_sb_info *fs = mp->um_e2fs;
|
|
struct ext2_super_block *es = fs->s_es;
|
|
struct buf *bp;
|
|
int error = 0;
|
|
/*
|
|
printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no");
|
|
*/
|
|
bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
|
|
bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block));
|
|
if (waitfor == MNT_WAIT)
|
|
error = bwrite(bp);
|
|
else
|
|
bawrite(bp);
|
|
|
|
/*
|
|
* The buffers for group descriptors, inode bitmaps and block bitmaps
|
|
* are not busy at this point and are (hopefully) written by the
|
|
* usual sync mechanism. No need to write them here
|
|
*/
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return the root of a filesystem.
|
|
*/
|
|
static int
|
|
ext2_root(mp, flags, vpp, td)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct vnode **vpp;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *nvp;
|
|
int error;
|
|
|
|
error = VFS_VGET(mp, (ino_t)ROOTINO, LK_EXCLUSIVE, &nvp);
|
|
if (error)
|
|
return (error);
|
|
*vpp = nvp;
|
|
return (0);
|
|
}
|