2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2002 Juli Mallett. All rights reserved.
6 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
7 * FreeBSD project. Redistribution and use in source and binary forms, with
8 * or without modification, are permitted provided that the following
11 * 1. Redistribution of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * 2. Redistribution in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/mount.h>
35 #include <sys/disklabel.h>
38 #include <ufs/ufs/ufsmount.h>
39 #include <ufs/ufs/dinode.h>
40 #include <ufs/ffs/fs.h>
51 sbread(struct uufsd *disk)
57 if ((errno = sbget(disk->d_fd, &fs, STDSB)) != 0) {
60 ERROR(disk, "non-existent or truncated superblock");
63 ERROR(disk, "no usable known superblock found");
66 ERROR(disk, "failed to allocate space for superblock "
70 ERROR(disk, "The previous newfs operation on this "
71 "volume did not complete.\nYou must complete "
72 "newfs before using this volume.");
75 ERROR(disk, "unknown superblock read error");
82 memcpy(&disk->d_fs, fs, fs->fs_sbsize);
85 if (fs->fs_magic == FS_UFS1_MAGIC)
87 if (fs->fs_magic == FS_UFS2_MAGIC)
89 disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1);
90 disk->d_sblock = fs->fs_sblockloc / disk->d_bsize;
91 disk->d_sbcsum = fs->fs_csp;
96 sbwrite(struct uufsd *disk, int all)
103 rv = ufs_disk_write(disk);
105 ERROR(disk, "failed to open disk for writing");
110 if ((errno = sbput(disk->d_fd, fs, all ? fs->fs_ncg : 0)) != 0) {
113 ERROR(disk, "failed to write superblock");
116 ERROR(disk, "unknown superblock write error");
126 * These are the low-level functions that actually read and write
127 * the superblock and its associated data. The actual work is done by
128 * the functions ffs_sbget and ffs_sbput in /sys/ufs/ffs/ffs_subr.c.
130 static int use_pread(void *devfd, off_t loc, void **bufp, int size);
131 static int use_pwrite(void *devfd, off_t loc, void *buf, int size);
134 * Read a superblock from the devfd device allocating memory returned
135 * in fsp. Also read the superblock summary information.
138 sbget(int devfd, struct fs **fsp, off_t sblockloc)
141 return (ffs_sbget(&devfd, fsp, sblockloc, "user", use_pread));
145 * A read function for use by user-level programs using libufs.
148 use_pread(void *devfd, off_t loc, void **bufp, int size)
153 if ((*bufp = malloc(size)) == NULL)
155 if (pread(fd, *bufp, size, loc) != size)
161 * Write a superblock to the devfd device from the memory pointed to by fs.
162 * Also write out the superblock summary information but do not free the
163 * summary information memory.
165 * Additionally write out numaltwrite of the alternate superblocks. Use
166 * fs->fs_ncg to write out all of the alternate superblocks.
169 sbput(int devfd, struct fs *fs, int numaltwrite)
171 struct csum *savedcsp;
172 off_t savedactualloc;
175 if ((error = ffs_sbput(&devfd, fs, fs->fs_sblockactualloc,
178 if (numaltwrite == 0)
180 savedactualloc = fs->fs_sblockactualloc;
181 savedcsp = fs->fs_csp;
183 for (i = 0; i < numaltwrite; i++) {
184 fs->fs_sblockactualloc = dbtob(fsbtodb(fs, cgsblock(fs, i)));
185 if ((error = ffs_sbput(&devfd, fs, fs->fs_sblockactualloc,
187 fs->fs_sblockactualloc = savedactualloc;
188 fs->fs_csp = savedcsp;
192 fs->fs_sblockactualloc = savedactualloc;
193 fs->fs_csp = savedcsp;
198 * A write function for use by user-level programs using sbput in libufs.
201 use_pwrite(void *devfd, off_t loc, void *buf, int size)
206 if (pwrite(fd, buf, size, loc) != size)