207 lines
5.2 KiB
C
207 lines
5.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2002 Juli Mallett. All rights reserved.
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*
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* This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
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* FreeBSD project. Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistribution of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistribution 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/disklabel.h>
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#include <sys/stat.h>
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#include <ufs/ufs/extattr.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fstab.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <libufs.h>
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/* Internally, track the 'name' value, it's ours. */
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#define MINE_NAME 0x01
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/* Track if its fd points to a writable device. */
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#define MINE_WRITE 0x02
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int
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ufs_disk_close(struct uufsd *disk)
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{
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ERROR(disk, NULL);
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close(disk->d_fd);
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disk->d_fd = -1;
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if (disk->d_inoblock != NULL) {
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free(disk->d_inoblock);
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disk->d_inoblock = NULL;
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}
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if (disk->d_mine & MINE_NAME) {
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free((char *)(uintptr_t)disk->d_name);
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disk->d_name = NULL;
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}
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if (disk->d_si != NULL) {
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free(disk->d_si->si_csp);
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free(disk->d_si);
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disk->d_si = NULL;
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}
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return (0);
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}
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int
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ufs_disk_fillout(struct uufsd *disk, const char *name)
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{
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if (ufs_disk_fillout_blank(disk, name) == -1) {
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return (-1);
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}
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if (sbread(disk) == -1) {
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ERROR(disk, "could not read superblock to fill out disk");
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ufs_disk_close(disk);
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return (-1);
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}
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return (0);
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}
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int
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ufs_disk_fillout_blank(struct uufsd *disk, const char *name)
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{
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struct stat st;
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struct fstab *fs;
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struct statfs sfs;
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const char *oname;
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char dev[MAXPATHLEN];
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int fd, ret;
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ERROR(disk, NULL);
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oname = name;
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again: if ((ret = stat(name, &st)) < 0) {
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if (*name != '/') {
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snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name);
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name = dev;
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goto again;
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}
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/*
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* The given object doesn't exist, but don't panic just yet -
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* it may be still mount point listed in /etc/fstab, but without
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* existing corresponding directory.
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*/
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name = oname;
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}
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if (ret >= 0 && S_ISREG(st.st_mode)) {
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/* Possibly a disk image, give it a try. */
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;
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} else if (ret >= 0 && S_ISCHR(st.st_mode)) {
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/* This is what we need, do nothing. */
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;
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} else if ((fs = getfsfile(name)) != NULL) {
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/*
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* The given mount point is listed in /etc/fstab.
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* It is possible that someone unmounted file system by hand
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* and different file system is mounted on this mount point,
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* but we still prefer /etc/fstab entry, because on the other
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* hand, there could be /etc/fstab entry for this mount
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* point, but file system is not mounted yet (eg. noauto) and
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* statfs(2) will point us at different file system.
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*/
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name = fs->fs_spec;
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} else if (ret >= 0 && S_ISDIR(st.st_mode)) {
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/*
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* The mount point is not listed in /etc/fstab, so it may be
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* file system mounted by hand.
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*/
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if (statfs(name, &sfs) < 0) {
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ERROR(disk, "could not find special device");
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return (-1);
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}
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strlcpy(dev, sfs.f_mntfromname, sizeof(dev));
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name = dev;
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} else {
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ERROR(disk, "could not find special device");
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return (-1);
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}
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fd = open(name, O_RDONLY);
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if (fd == -1) {
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ERROR(disk, "could not open special device");
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return (-1);
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}
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disk->d_bsize = 1;
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disk->d_ccg = 0;
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disk->d_fd = fd;
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disk->d_inoblock = NULL;
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disk->d_inomin = 0;
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disk->d_inomax = 0;
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disk->d_lcg = 0;
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disk->d_mine = 0;
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disk->d_ufs = 0;
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disk->d_error = NULL;
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disk->d_si = NULL;
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disk->d_sblockloc = UFS_STDSB;
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disk->d_lookupflags = 0;
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if (oname != name) {
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name = strdup(name);
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if (name == NULL) {
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ERROR(disk, "could not allocate memory for disk name");
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return (-1);
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}
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disk->d_mine |= MINE_NAME;
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}
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disk->d_name = name;
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return (0);
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}
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int
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ufs_disk_write(struct uufsd *disk)
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{
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int fd;
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ERROR(disk, NULL);
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if (disk->d_mine & MINE_WRITE)
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return (0);
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fd = open(disk->d_name, O_RDWR);
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if (fd < 0) {
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ERROR(disk, "failed to open disk for writing");
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return (-1);
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}
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close(disk->d_fd);
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disk->d_fd = fd;
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disk->d_mine |= MINE_WRITE;
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return (0);
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}
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