1 /* $NetBSD: resize_lfs.c,v 1.5 2006/11/11 14:47:28 jmmv 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/disk.h> 44 #include <sys/file.h> 45 #include <sys/mount.h> 46 #include <sys/statvfs.h> 47 48 #include <ufs/ufs/dinode.h> 49 #include <ufs/lfs/lfs.h> 50 51 #include <disktab.h> 52 #include <err.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include "partutil.h" 59 60 static void 61 usage(void) 62 { 63 errx(1, "usage: resize_lfs [-v] [-s new-size] [filesystem]"); 64 } 65 66 int 67 main(int argc, char **argv) 68 { 69 char *rdev, *fsname, buf[LFS_SBPAD]; 70 daddr_t newsize, newnsegs; 71 int devfd, rootfd; 72 int ch, i, verbose; 73 off_t secsize, sboff; 74 struct disk_geom geo; 75 struct dkwedge_info dkw; 76 struct lfs *fs; 77 struct statvfs vfs; 78 79 /* Initialize and parse arguments */ 80 verbose = 0; 81 newsize = 0; 82 while ((ch = getopt(argc, argv, "s:v")) != -1) { 83 switch(ch) { 84 case 's': /* New size, in sectors */ 85 newsize = strtoll(optarg, NULL, 10); 86 break; 87 case 'v': 88 ++verbose; 89 break; 90 default: 91 usage(); 92 } 93 } 94 fsname = argv[optind]; 95 96 if (fsname == NULL) 97 usage(); 98 99 /* 100 * If the user did not supply a filesystem size, use the 101 * length of the mounted partition. 102 */ 103 if (statvfs(fsname, &vfs) < 0) 104 err(1, "%s", fsname); 105 rdev = (char *)malloc(strlen(vfs.f_mntfromname + 2)); 106 sprintf(rdev, "/dev/r%s", vfs.f_mntfromname + 5); 107 devfd = open(rdev, O_RDONLY); 108 if (devfd < 0) 109 err(1, "open raw device"); 110 111 /* 112 * Read the disklabel to find the sector size. Check the 113 * given size against the partition size. We can skip some 114 * error checking here since we know the fs is mountable. 115 */ 116 if (getdiskinfo(rdev, devfd, NULL, &geo, &dkw) == -1) 117 err(1, "%s: could not get info", rdev); 118 secsize = geo.dg_secsize; 119 if (newsize > dkw.dkw_size) 120 errx(1, "new size must be <= the partition size"); 121 if (newsize == 0) 122 newsize = dkw.dkw_size; 123 124 /* Open the root of the filesystem so we can fcntl() it */ 125 rootfd = open(fsname, O_RDONLY); 126 if (rootfd < 0) 127 err(1, "open filesystem root"); 128 129 /* Read the superblock, finding alternates if necessary */ 130 fs = (struct lfs *)malloc(sizeof(*fs)); 131 for (sboff = LFS_LABELPAD;;) { 132 pread(devfd, buf, sboff, LFS_SBPAD); 133 memcpy(&fs->lfs_dlfs, buf, sizeof(struct dlfs)); 134 if (sboff == LFS_LABELPAD && fsbtob(fs, 1) > LFS_LABELPAD) 135 sboff = fsbtob(fs, (off_t)fs->lfs_sboffs[0]); 136 else 137 break; 138 } 139 close(devfd); 140 141 /* Calculate new number of segments. */ 142 newnsegs = (newsize * secsize) / fs->lfs_ssize; 143 if (newnsegs == fs->lfs_nseg) { 144 errx(0, "the filesystem is unchanged."); 145 } 146 147 /* 148 * If the new filesystem is smaller than the old, we have to 149 * invalidate the segments that extend beyond the new boundary. 150 * Make the cleaner do this for us. 151 * (XXX make the kernel able to do this instead?) 152 */ 153 for (i = fs->lfs_nseg - 1; i >= newnsegs; --i) { 154 char cmd[80]; 155 156 /* If it's already empty, don't call the cleaner */ 157 if (fcntl(rootfd, LFCNINVAL, &i) == 0) 158 continue; 159 160 sprintf(cmd, "/libexec/lfs_cleanerd -q -i %d %s", i, fsname); 161 if (system(cmd) != 0) 162 err(1, "invalidating segment %d", i); 163 } 164 165 /* Tell the filesystem to resize itself. */ 166 if (fcntl(rootfd, LFCNRESIZE, &newnsegs) == -1) { 167 err(1, "resizing"); 168 } 169 170 if (verbose) 171 printf("Successfully resized %s from %d to %lld segments\n", 172 fsname, fs->lfs_nseg, (long long)newnsegs); 173 return 0; 174 } 175