1 /* $NetBSD: resize_lfs.c,v 1.2 2005/06/02 01:16:06 lukem 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 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/stat.h> 41 #include <sys/ioctl.h> 42 #include <sys/disklabel.h> 43 #include <sys/file.h> 44 #include <sys/mount.h> 45 #include <sys/statvfs.h> 46 47 #include <ufs/ufs/dinode.h> 48 #include <ufs/lfs/lfs.h> 49 50 #include <disktab.h> 51 #include <err.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 static void 58 usage(void) 59 { 60 errx(1, "usage: resize_lfs [-v] [-s new-size] [filesystem]\n"); 61 } 62 63 int 64 main(int argc, char **argv) 65 { 66 char *cp, *rdev, *fsname, buf[LFS_SBPAD]; 67 daddr_t newsize, newnsegs; 68 int devfd, rootfd; 69 int ch, i, verbose; 70 off_t secsize, sboff; 71 struct disklabel lbl; 72 struct lfs *fs; 73 struct partition *pp; 74 struct statvfs vfs; 75 76 /* Initialize and parse arguments */ 77 verbose = 0; 78 newsize = 0; 79 while ((ch = getopt(argc, argv, "s:v")) != -1) { 80 switch(ch) { 81 case 's': /* New size, in sectors */ 82 newsize = strtoll(optarg, NULL, 10); 83 break; 84 case 'v': 85 ++verbose; 86 break; 87 default: 88 usage(); 89 } 90 } 91 fsname = argv[optind]; 92 93 if (fsname == NULL) 94 usage(); 95 96 /* 97 * If the user did not supply a filesystem size, use the 98 * length of the mounted partition. 99 */ 100 if (statvfs(fsname, &vfs) < 0) 101 err(1, "%s", fsname); 102 rdev = (char *)malloc(strlen(vfs.f_mntfromname + 2)); 103 sprintf(rdev, "/dev/r%s", vfs.f_mntfromname + 5); 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 (ioctl(devfd, DIOCGDINFO, &lbl) < 0) 114 err(1, "%s: ioctl (GDINFO)", rdev); 115 secsize = lbl.d_secsize; 116 cp = strchr(rdev, '\0') - 1; 117 pp = &lbl.d_partitions[*cp - 'a']; 118 if (newsize > pp->p_size) 119 errx(1, "new size must be <= the partition size"); 120 if (newsize == 0) 121 newsize = pp->p_size; 122 123 /* Open the root of the filesystem so we can fcntl() it */ 124 rootfd = open(fsname, O_RDONLY); 125 if (rootfd < 0) 126 err(1, "open filesystem root"); 127 128 /* Read the superblock, finding alternates if necessary */ 129 fs = (struct lfs *)malloc(sizeof(*fs)); 130 for (sboff = LFS_LABELPAD;;) { 131 pread(devfd, buf, sboff, LFS_SBPAD); 132 memcpy(&fs->lfs_dlfs, buf, sizeof(struct dlfs)); 133 if (sboff == LFS_LABELPAD && fsbtob(fs, 1) > LFS_LABELPAD) 134 sboff = fsbtob(fs, (off_t)fs->lfs_sboffs[0]); 135 else 136 break; 137 } 138 close(devfd); 139 140 /* Calculate new number of segments. */ 141 newnsegs = (newsize * secsize) / fs->lfs_ssize; 142 if (newnsegs == fs->lfs_nseg) { 143 errx(0, "the filesystem is unchanged."); 144 } 145 146 /* 147 * If the new filesystem is smaller than the old, we have to 148 * invalidate the segments that extend beyond the new boundary. 149 * Make the cleaner do this for us. 150 * (XXX make the kernel able to do this instead?) 151 */ 152 for (i = fs->lfs_nseg - 1; i >= newnsegs; --i) { 153 char cmd[80]; 154 155 /* If it's already empty, don't call the cleaner */ 156 if (fcntl(rootfd, LFCNINVAL, &i) == 0) 157 continue; 158 159 sprintf(cmd, "/usr/libexec/lfs_cleanerd -q -i %d %s", 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 %d to %lld segments\n", 171 fsname, fs->lfs_nseg, (long long)newnsegs); 172 return 0; 173 } 174