1 /* $NetBSD: resize_lfs.c,v 1.16 2023/08/07 23:27:07 mrg Exp $ */
2 /*-
3 * Copyright (c) 2005 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Konrad E. Schroder <perseant@hhhh.org>.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/param.h>
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <sys/ioctl.h>
35 #include <sys/disklabel.h>
36 #include <sys/disk.h>
37 #include <sys/file.h>
38 #include <sys/mount.h>
39 #include <sys/statvfs.h>
40
41 #include <ufs/lfs/lfs.h>
42 #include <ufs/lfs/lfs_accessors.h>
43
44 #include <disktab.h>
45 #include <err.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50 #include <util.h>
51
52 #include "partutil.h"
53
54 static void
usage(void)55 usage(void)
56 {
57 errx(1, "usage: resize_lfs [-v] [-s new-size] [filesystem]");
58 }
59
60 int
main(int argc,char ** argv)61 main(int argc, char **argv)
62 {
63 char *rdev, *fsname, buf[LFS_SBPAD];
64 size_t rdevlen;
65 daddr_t newsize, newnsegs;
66 int devfd, rootfd;
67 int ch, i, verbose;
68 off_t secsize, sboff;
69 struct disk_geom geo;
70 struct dkwedge_info dkw;
71 struct lfs *fs;
72 struct statvfs vfs;
73
74 /* Initialize and parse arguments */
75 verbose = 0;
76 newsize = 0;
77 while ((ch = getopt(argc, argv, "s:v")) != -1) {
78 switch(ch) {
79 case 's': /* New size, in sectors */
80 newsize = strtoll(optarg, NULL, 10);
81 break;
82 case 'v':
83 ++verbose;
84 break;
85 default:
86 usage();
87 }
88 }
89 fsname = argv[optind];
90
91 if (fsname == NULL)
92 usage();
93
94 /*
95 * If the user did not supply a filesystem size, use the
96 * length of the mounted partition.
97 */
98 if (statvfs(fsname, &vfs) < 0)
99 err(1, "%s", fsname);
100 rdevlen = strlen(vfs.f_mntfromname) + 2;
101 rdev = malloc(rdevlen);
102 if (getdiskrawname(rdev, rdevlen, vfs.f_mntfromname) == NULL)
103 err(1, "Could not convert '%s' to raw name", vfs.f_mntfromname);
104 devfd = open(rdev, O_RDONLY);
105 if (devfd < 0)
106 err(1, "open raw device");
107
108 /*
109 * Read the disklabel to find the sector size. Check the
110 * given size against the partition size. We can skip some
111 * error checking here since we know the fs is mountable.
112 */
113 if (getdiskinfo(rdev, devfd, NULL, &geo, &dkw) == -1)
114 err(1, "%s: could not get info", rdev);
115 secsize = geo.dg_secsize;
116 if (newsize > dkw.dkw_size)
117 errx(1, "new size must be <= the partition size");
118 if (newsize == 0)
119 newsize = dkw.dkw_size;
120
121 /* Open the root of the filesystem so we can fcntl() it */
122 rootfd = open(fsname, O_RDONLY);
123 if (rootfd < 0)
124 err(1, "open filesystem root");
125
126 /* Read the superblock, finding alternates if necessary */
127 fs = (struct lfs *)calloc(sizeof(*fs), 1);
128 for (sboff = LFS_LABELPAD;;) {
129 pread(devfd, buf, sboff, LFS_SBPAD);
130 __CTASSERT(sizeof(struct dlfs) == sizeof(struct dlfs64));
131 memcpy(&fs->lfs_dlfs_u, buf, sizeof(struct dlfs));
132 if (sboff == LFS_LABELPAD && lfs_fsbtob(fs, 1) > LFS_LABELPAD)
133 sboff = lfs_fsbtob(fs, (off_t)lfs_sb_getsboff(fs, 0));
134 else
135 break;
136 }
137 close(devfd);
138
139 /* Calculate new number of segments. */
140 newnsegs = (newsize * secsize) / lfs_sb_getssize(fs);
141 if (newnsegs == lfs_sb_getnseg(fs)) {
142 errx(0, "the filesystem is unchanged.");
143 }
144
145 /*
146 * If the new filesystem is smaller than the old, we have to
147 * invalidate the segments that extend beyond the new boundary.
148 * Make the cleaner do this for us.
149 * (XXX make the kernel able to do this instead?)
150 */
151 for (i = lfs_sb_getnseg(fs) - 1; i >= newnsegs; --i) {
152 char cmd[128];
153
154 /* If it's already empty, don't call the cleaner */
155 if (fcntl(rootfd, LFCNINVAL, &i) == 0)
156 continue;
157
158 snprintf(cmd, sizeof(cmd), "/libexec/lfs_cleanerd -q -i %d %s",
159 i, fsname);
160 if (system(cmd) != 0)
161 err(1, "invalidating segment %d", i);
162 }
163
164 /* Tell the filesystem to resize itself. */
165 if (fcntl(rootfd, LFCNRESIZE, &newnsegs) == -1) {
166 err(1, "resizing");
167 }
168
169 if (verbose)
170 printf("Successfully resized %s from %u to %lld segments\n",
171 fsname, lfs_sb_getnseg(fs), (long long)newnsegs);
172 return 0;
173 }
174