1 /* $NetBSD: ffs_inode.c,v 1.18 2008/07/20 01:20:22 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993, 1994\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 __RCSID("$NetBSD: ffs_inode.c,v 1.18 2008/07/20 01:20:22 lukem Exp $"); 40 #endif /* not lint */ 41 42 #include <sys/param.h> 43 #include <sys/time.h> 44 #include <sys/stat.h> 45 #include <ufs/ufs/dir.h> 46 #include <ufs/ufs/dinode.h> 47 #include <ufs/ffs/fs.h> 48 #include <ufs/ffs/ffs_extern.h> 49 #include <ufs/ufs/ufs_bswap.h> 50 51 #include <protocols/dumprestore.h> 52 53 #include <ctype.h> 54 #include <errno.h> 55 #include <fts.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #include "dump.h" 62 63 struct fs *sblock; 64 65 static off_t sblock_try[] = SBLOCKSEARCH; 66 off_t sblockloc; 67 68 int is_ufs2; 69 70 /* 71 * Read the superblock from disk, and check its magic number. 72 * Determine whether byte-swapping needs to be done on this file system. 73 */ 74 int 75 fs_read_sblock(char *superblock) 76 { 77 int i; 78 int ns = 0; 79 80 sblock = (struct fs *)superblock; 81 for (i = 0; ; i++) { 82 if (sblock_try[i] == -1) 83 quit("can't find superblock\n"); 84 rawread(sblock_try[i], (char *)superblock, MAXBSIZE); 85 86 switch(sblock->fs_magic) { 87 case FS_UFS2_MAGIC: 88 is_ufs2 = 1; 89 /*FALLTHROUGH*/ 90 case FS_UFS1_MAGIC: 91 break; 92 case FS_UFS2_MAGIC_SWAPPED: 93 is_ufs2 = 1; 94 /*FALLTHROUGH*/ 95 case FS_UFS1_MAGIC_SWAPPED: 96 ns = 1; 97 ffs_sb_swap(sblock, sblock); 98 break; 99 default: 100 continue; 101 } 102 if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2) 103 continue; 104 if ((is_ufs2 || sblock->fs_old_flags & FS_FLAGS_UPDATED) 105 && sblock_try[i] != sblock->fs_sblockloc) 106 continue; 107 break; 108 } 109 return ns; 110 } 111 112 /* 113 * Fill in the ufsi struct, as well as the maxino and dev_bsize global 114 * variables. 115 */ 116 struct ufsi * 117 fs_parametrize(void) 118 { 119 static struct ufsi ufsi; 120 121 #ifdef FS_44INODEFMT 122 if (is_ufs2 || sblock->fs_old_inodefmt >= FS_44INODEFMT) { 123 spcl.c_flags = iswap32(iswap32(spcl.c_flags) | DR_NEWINODEFMT); 124 } else { 125 /* 126 * Determine parameters for older file systems. From 127 * /sys/ufs/ffs/ffs_vfsops.c::ffs_oldfscompat() 128 * 129 * XXX: not sure if other variables (fs_npsect, fs_interleave, 130 * fs_nrpos, fs_maxfilesize) need to be fudged too. 131 */ 132 sblock->fs_qbmask = ~sblock->fs_bmask; 133 sblock->fs_qfmask = ~sblock->fs_fmask; 134 } 135 #endif 136 137 /* Fill out ufsi struct */ 138 ufsi.ufs_dsize = fsbtodb(sblock,sblock->fs_size); 139 ufsi.ufs_bsize = sblock->fs_bsize; 140 ufsi.ufs_bshift = sblock->fs_bshift; 141 ufsi.ufs_fsize = sblock->fs_fsize; 142 ufsi.ufs_frag = sblock->fs_frag; 143 ufsi.ufs_fsatoda = sblock->fs_fsbtodb; 144 ufsi.ufs_nindir = sblock->fs_nindir; 145 ufsi.ufs_inopb = sblock->fs_inopb; 146 ufsi.ufs_maxsymlinklen = sblock->fs_maxsymlinklen; 147 ufsi.ufs_bmask = sblock->fs_bmask; 148 ufsi.ufs_fmask = sblock->fs_fmask; 149 ufsi.ufs_qbmask = sblock->fs_qbmask; 150 ufsi.ufs_qfmask = sblock->fs_qfmask; 151 152 dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1); 153 154 return &ufsi; 155 } 156 157 ino_t 158 fs_maxino(void) 159 { 160 161 return sblock->fs_ipg * sblock->fs_ncg; 162 } 163 164 void 165 fs_mapinodes(ino_t maxino __unused, u_int64_t *tape_size, int *anydirskipped) 166 { 167 int i, cg, inosused; 168 struct cg *cgp; 169 ino_t ino; 170 char *cp; 171 172 if ((cgp = malloc(sblock->fs_cgsize)) == NULL) 173 quit("fs_mapinodes: cannot allocate memory.\n"); 174 175 for (cg = 0; cg < sblock->fs_ncg; cg++) { 176 ino = cg * sblock->fs_ipg; 177 bread(fsbtodb(sblock, cgtod(sblock, cg)), (char *)cgp, 178 sblock->fs_cgsize); 179 if (needswap) 180 ffs_cg_swap(cgp, cgp, sblock); 181 if (sblock->fs_magic == FS_UFS2_MAGIC) 182 inosused = cgp->cg_initediblk; 183 else 184 inosused = sblock->fs_ipg; 185 /* 186 * If we are using soft updates, then we can trust the 187 * cylinder group inode allocation maps to tell us which 188 * inodes are allocated. We will scan the used inode map 189 * to find the inodes that are really in use, and then 190 * read only those inodes in from disk. 191 */ 192 if (sblock->fs_flags & FS_DOSOFTDEP) { 193 if (!cg_chkmagic(cgp, 0)) 194 quit("mapfiles: cg %d: bad magic number\n", cg); 195 cp = &cg_inosused(cgp, 0)[(inosused - 1) / CHAR_BIT]; 196 for ( ; inosused > 0; inosused -= CHAR_BIT, cp--) { 197 if (*cp == 0) 198 continue; 199 for (i = 1 << (CHAR_BIT - 1); i > 0; i >>= 1) { 200 if (*cp & i) 201 break; 202 inosused--; 203 } 204 break; 205 } 206 if (inosused <= 0) 207 continue; 208 } 209 for (i = 0; i < inosused; i++, ino++) { 210 if (ino < ROOTINO) 211 continue; 212 mapfileino(ino, tape_size, anydirskipped); 213 } 214 } 215 216 free(cgp); 217 } 218 219 union dinode * 220 getino(ino_t inum) 221 { 222 static ino_t minino, maxino; 223 static caddr_t inoblock; 224 int ntoswap, i; 225 struct ufs1_dinode *dp1; 226 struct ufs2_dinode *dp2; 227 228 if (inoblock == NULL && (inoblock = malloc(ufsib->ufs_bsize)) == NULL) 229 quit("cannot allocate inode memory.\n"); 230 curino = inum; 231 if (inum >= minino && inum < maxino) 232 goto gotit; 233 bread(fsatoda(ufsib, ino_to_fsba(sblock, inum)), (char *)inoblock, 234 (int)ufsib->ufs_bsize); 235 minino = inum - (inum % INOPB(sblock)); 236 maxino = minino + INOPB(sblock); 237 if (needswap) { 238 if (is_ufs2) { 239 dp2 = (struct ufs2_dinode *)inoblock; 240 ntoswap = ufsib->ufs_bsize / sizeof(struct ufs2_dinode); 241 for (i = 0; i < ntoswap; i++) 242 ffs_dinode2_swap(&dp2[i], &dp2[i]); 243 } else { 244 dp1 = (struct ufs1_dinode *)inoblock; 245 ntoswap = ufsib->ufs_bsize / sizeof(struct ufs1_dinode); 246 for (i = 0; i < ntoswap; i++) 247 ffs_dinode1_swap(&dp1[i], &dp1[i]); 248 } 249 } 250 gotit: 251 if (is_ufs2) { 252 dp2 = &((struct ufs2_dinode *)inoblock)[inum - minino]; 253 return (union dinode *)dp2; 254 } 255 dp1 = &((struct ufs1_dinode *)inoblock)[inum - minino]; 256 return ((union dinode *)dp1); 257 } 258