traverse.c revision 97956
1177633Sdfr/*- 2177633Sdfr * Copyright (c) 1980, 1988, 1991, 1993 3177633Sdfr * The Regents of the University of California. All rights reserved. 4177633Sdfr * 5177633Sdfr * Redistribution and use in source and binary forms, with or without 6177633Sdfr * modification, are permitted provided that the following conditions 7177633Sdfr * are met: 8177633Sdfr * 1. Redistributions of source code must retain the above copyright 9177633Sdfr * notice, this list of conditions and the following disclaimer. 10177633Sdfr * 2. Redistributions in binary form must reproduce the above copyright 11177633Sdfr * notice, this list of conditions and the following disclaimer in the 12177633Sdfr * documentation and/or other materials provided with the distribution. 13177633Sdfr * 3. All advertising materials mentioning features or use of this software 14177633Sdfr * must display the following acknowledgement: 15177633Sdfr * This product includes software developed by the University of 16177633Sdfr * California, Berkeley and its contributors. 17177633Sdfr * 4. Neither the name of the University nor the names of its contributors 18177633Sdfr * may be used to endorse or promote products derived from this software 19177633Sdfr * without specific prior written permission. 20177633Sdfr * 21177633Sdfr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22177633Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23177633Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24177633Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25177633Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26177633Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27177633Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28177633Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29177633Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30177633Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31177633Sdfr * SUCH DAMAGE. 32177633Sdfr */ 33177633Sdfr 34177633Sdfr#ifndef lint 35177633Sdfr#if 0 36177633Sdfrstatic char sccsid[] = "@(#)traverse.c 8.7 (Berkeley) 6/15/95"; 37177633Sdfr#endif 38177633Sdfrstatic const char rcsid[] = 39177633Sdfr "$FreeBSD: head/sbin/dump/traverse.c 97956 2002-06-06 19:59:46Z phk $"; 40177685Sdfr#endif /* not lint */ 41177685Sdfr 42177633Sdfr#include <sys/param.h> 43177633Sdfr#include <sys/stat.h> 44177633Sdfr 45177633Sdfr#include <ufs/ufs/dir.h> 46177633Sdfr#include <ufs/ufs/dinode.h> 47177633Sdfr#include <ufs/ffs/fs.h> 48177633Sdfr 49177633Sdfr#include <protocols/dumprestore.h> 50177633Sdfr 51177633Sdfr#include <ctype.h> 52177633Sdfr#include <stdio.h> 53177633Sdfr#include <errno.h> 54177633Sdfr#include <string.h> 55177633Sdfr#include <unistd.h> 56177633Sdfr 57177633Sdfr#include "dump.h" 58177633Sdfr 59177633Sdfr#define HASDUMPEDFILE 0x1 60177633Sdfr#define HASSUBDIRS 0x2 61177633Sdfr 62177633Sdfr#ifdef FS_44INODEFMT 63177633Sdfrtypedef quad_t fsizeT; 64177633Sdfr#else 65177633Sdfrtypedef long fsizeT; 66177633Sdfr#endif 67177633Sdfr 68177633Sdfrstatic int dirindir(ino_t ino, ufs_daddr_t blkno, int level, long *size, 69177633Sdfr long *tapesize, int nodump); 70177633Sdfrstatic void dmpindir(ino_t ino, ufs_daddr_t blk, int level, fsizeT *size); 71177633Sdfrstatic int searchdir(ino_t ino, ufs_daddr_t blkno, long size, long filesize, 72177633Sdfr long *tapesize, int nodump); 73177633Sdfr 74177633Sdfr/* 75177633Sdfr * This is an estimation of the number of TP_BSIZE blocks in the file. 76177633Sdfr * It estimates the number of blocks in files with holes by assuming 77177633Sdfr * that all of the blocks accounted for by di_blocks are data blocks 78177633Sdfr * (when some of the blocks are usually used for indirect pointers); 79177633Sdfr * hence the estimate may be high. 80177633Sdfr */ 81177633Sdfrlong 82177633Sdfrblockest(struct dinode *dp) 83177633Sdfr{ 84177633Sdfr long blkest, sizeest; 85177633Sdfr 86177633Sdfr /* 87177633Sdfr * dp->di_size is the size of the file in bytes. 88177633Sdfr * dp->di_blocks stores the number of sectors actually in the file. 89177633Sdfr * If there are more sectors than the size would indicate, this just 90177633Sdfr * means that there are indirect blocks in the file or unused 91177633Sdfr * sectors in the last file block; we can safely ignore these 92177633Sdfr * (blkest = sizeest below). 93177633Sdfr * If the file is bigger than the number of sectors would indicate, 94177633Sdfr * then the file has holes in it. In this case we must use the 95177633Sdfr * block count to estimate the number of data blocks used, but 96177633Sdfr * we use the actual size for estimating the number of indirect 97177633Sdfr * dump blocks (sizeest vs. blkest in the indirect block 98177633Sdfr * calculation). 99177633Sdfr */ 100177633Sdfr blkest = howmany(dbtob(dp->di_blocks), TP_BSIZE); 101177633Sdfr sizeest = howmany(dp->di_size, TP_BSIZE); 102177633Sdfr if (blkest > sizeest) 103177633Sdfr blkest = sizeest; 104177633Sdfr if (dp->di_size > sblock->fs_bsize * NDADDR) { 105177633Sdfr /* calculate the number of indirect blocks on the dump tape */ 106177633Sdfr blkest += 107177633Sdfr howmany(sizeest - NDADDR * sblock->fs_bsize / TP_BSIZE, 108177633Sdfr TP_NINDIR); 109177633Sdfr } 110177633Sdfr return (blkest + 1); 111177633Sdfr} 112177633Sdfr 113177633Sdfr/* Auxiliary macro to pick up files changed since previous dump. */ 114177633Sdfr#define CHANGEDSINCE(dp, t) \ 115177633Sdfr ((dp)->di_mtime >= (t) || (dp)->di_ctime >= (t)) 116177633Sdfr 117177633Sdfr/* The WANTTODUMP macro decides whether a file should be dumped. */ 118177633Sdfr#ifdef UF_NODUMP 119177633Sdfr#define WANTTODUMP(dp) \ 120177633Sdfr (CHANGEDSINCE(dp, spcl.c_ddate) && \ 121177633Sdfr (nonodump || ((dp)->di_flags & UF_NODUMP) != UF_NODUMP)) 122177633Sdfr#else 123177633Sdfr#define WANTTODUMP(dp) CHANGEDSINCE(dp, spcl.c_ddate) 124177633Sdfr#endif 125177633Sdfr 126177633Sdfr/* 127177633Sdfr * Dump pass 1. 128177633Sdfr * 129177633Sdfr * Walk the inode list for a filesystem to find all allocated inodes 130177633Sdfr * that have been modified since the previous dump time. Also, find all 131177633Sdfr * the directories in the filesystem. 132177633Sdfr */ 133177633Sdfrint 134177633Sdfrmapfiles(ino_t maxino, long *tapesize) 135177633Sdfr{ 136177633Sdfr int mode; 137177633Sdfr ino_t ino; 138177633Sdfr struct dinode *dp; 139177633Sdfr int anydirskipped = 0; 140177633Sdfr 141177633Sdfr for (ino = ROOTINO; ino < maxino; ino++) { 142177633Sdfr dp = getino(ino); 143177633Sdfr if ((mode = (dp->di_mode & IFMT)) == 0) 144177633Sdfr continue; 145177633Sdfr /* 146177633Sdfr * Everything must go in usedinomap so that a check 147177633Sdfr * for "in dumpdirmap but not in usedinomap" to detect 148177633Sdfr * dirs with nodump set has a chance of succeeding 149177633Sdfr * (this is used in mapdirs()). 150177633Sdfr */ 151177633Sdfr SETINO(ino, usedinomap); 152177633Sdfr if (mode == IFDIR) 153177633Sdfr SETINO(ino, dumpdirmap); 154177633Sdfr if (WANTTODUMP(dp)) { 155177633Sdfr SETINO(ino, dumpinomap); 156177633Sdfr if (mode != IFREG && mode != IFDIR && mode != IFLNK) 157177633Sdfr *tapesize += 1; 158177633Sdfr else 159177633Sdfr *tapesize += blockest(dp); 160177633Sdfr continue; 161177633Sdfr } 162177633Sdfr if (mode == IFDIR) { 163177633Sdfr if (!nonodump && (dp->di_flags & UF_NODUMP)) 164177633Sdfr CLRINO(ino, usedinomap); 165177633Sdfr anydirskipped = 1; 166177633Sdfr } 167177633Sdfr } 168177633Sdfr /* 169177633Sdfr * Restore gets very upset if the root is not dumped, 170177633Sdfr * so ensure that it always is dumped. 171177633Sdfr */ 172177633Sdfr SETINO(ROOTINO, dumpinomap); 173177633Sdfr return (anydirskipped); 174177633Sdfr} 175177633Sdfr 176177633Sdfr/* 177177633Sdfr * Dump pass 2. 178177633Sdfr * 179177633Sdfr * Scan each directory on the filesystem to see if it has any modified 180177633Sdfr * files in it. If it does, and has not already been added to the dump 181177633Sdfr * list (because it was itself modified), then add it. If a directory 182177633Sdfr * has not been modified itself, contains no modified files and has no 183177633Sdfr * subdirectories, then it can be deleted from the dump list and from 184177633Sdfr * the list of directories. By deleting it from the list of directories, 185177633Sdfr * its parent may now qualify for the same treatment on this or a later 186177633Sdfr * pass using this algorithm. 187177633Sdfr */ 188177633Sdfrint 189177633Sdfrmapdirs(ino_t maxino, long *tapesize) 190177633Sdfr{ 191177633Sdfr struct dinode *dp; 192177633Sdfr int i, isdir, nodump; 193177633Sdfr char *map; 194177633Sdfr ino_t ino; 195177633Sdfr struct dinode di; 196177633Sdfr long filesize; 197177633Sdfr int ret, change = 0; 198177633Sdfr 199177633Sdfr isdir = 0; /* XXX just to get gcc to shut up */ 200177633Sdfr for (map = dumpdirmap, ino = 1; ino < maxino; ino++) { 201177633Sdfr if (((ino - 1) % NBBY) == 0) /* map is offset by 1 */ 202177633Sdfr isdir = *map++; 203177633Sdfr else 204177633Sdfr isdir >>= 1; 205177633Sdfr /* 206177633Sdfr * If a directory has been removed from usedinomap, it 207177633Sdfr * either has the nodump flag set, or has inherited 208177633Sdfr * it. Although a directory can't be in dumpinomap if 209177633Sdfr * it isn't in usedinomap, we have to go through it to 210177633Sdfr * propagate the nodump flag. 211177633Sdfr */ 212177633Sdfr nodump = !nonodump && (TSTINO(ino, usedinomap) == 0); 213177633Sdfr if ((isdir & 1) == 0 || (TSTINO(ino, dumpinomap) && !nodump)) 214177633Sdfr continue; 215177633Sdfr dp = getino(ino); 216177633Sdfr di = *dp; /* inode buf may change in searchdir(). */ 217177633Sdfr filesize = di.di_size; 218177633Sdfr for (ret = 0, i = 0; filesize > 0 && i < NDADDR; i++) { 219177633Sdfr if (di.di_db[i] != 0) 220177633Sdfr ret |= searchdir(ino, di.di_db[i], 221177633Sdfr (long)dblksize(sblock, dp, i), 222177633Sdfr filesize, tapesize, nodump); 223177633Sdfr if (ret & HASDUMPEDFILE) 224177633Sdfr filesize = 0; 225177633Sdfr else 226177633Sdfr filesize -= sblock->fs_bsize; 227177633Sdfr } 228177633Sdfr for (i = 0; filesize > 0 && i < NIADDR; i++) { 229177633Sdfr if (di.di_ib[i] == 0) 230177633Sdfr continue; 231177633Sdfr ret |= dirindir(ino, di.di_ib[i], i, &filesize, 232177633Sdfr tapesize, nodump); 233177633Sdfr } 234177633Sdfr if (ret & HASDUMPEDFILE) { 235177633Sdfr SETINO(ino, dumpinomap); 236177633Sdfr *tapesize += blockest(dp); 237177633Sdfr change = 1; 238177633Sdfr continue; 239177633Sdfr } 240177633Sdfr if (nodump) { 241177633Sdfr if (ret & HASSUBDIRS) 242180025Sdfr change = 1; /* subdirs inherit nodump */ 243180025Sdfr CLRINO(ino, dumpdirmap); 244177633Sdfr } else if ((ret & HASSUBDIRS) == 0) 245177633Sdfr if (!TSTINO(ino, dumpinomap)) { 246177633Sdfr CLRINO(ino, dumpdirmap); 247177633Sdfr change = 1; 248177633Sdfr } 249177633Sdfr } 250177633Sdfr return (change); 251177633Sdfr} 252180025Sdfr 253180025Sdfr/* 254180025Sdfr * Read indirect blocks, and pass the data blocks to be searched 255180025Sdfr * as directories. Quit as soon as any entry is found that will 256177633Sdfr * require the directory to be dumped. 257177633Sdfr */ 258177633Sdfrstatic int 259177633Sdfrdirindir(ino_t ino, ufs_daddr_t blkno, int ind_level, long *filesize, 260177633Sdfr long *tapesize, int nodump) 261177633Sdfr{ 262177633Sdfr int ret = 0; 263177633Sdfr int i; 264177633Sdfr ufs_daddr_t idblk[MAXNINDIR]; 265177633Sdfr 266177633Sdfr bread(fsbtodb(sblock, blkno), (char *)idblk, (int)sblock->fs_bsize); 267177633Sdfr if (ind_level <= 0) { 268177633Sdfr for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) { 269177633Sdfr blkno = idblk[i]; 270177633Sdfr if (blkno != 0) 271177633Sdfr ret |= searchdir(ino, blkno, sblock->fs_bsize, 272177633Sdfr *filesize, tapesize, nodump); 273177633Sdfr if (ret & HASDUMPEDFILE) 274177633Sdfr *filesize = 0; 275177633Sdfr else 276177633Sdfr *filesize -= sblock->fs_bsize; 277180025Sdfr } 278180025Sdfr return (ret); 279177633Sdfr } 280177633Sdfr ind_level--; 281177633Sdfr for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) { 282180025Sdfr blkno = idblk[i]; 283180025Sdfr if (blkno != 0) 284180025Sdfr ret |= dirindir(ino, blkno, ind_level, filesize, 285180025Sdfr tapesize, nodump); 286177633Sdfr } 287177633Sdfr return (ret); 288177633Sdfr} 289177633Sdfr 290177633Sdfr/* 291177633Sdfr * Scan a disk block containing directory information looking to see if 292177633Sdfr * any of the entries are on the dump list and to see if the directory 293177633Sdfr * contains any subdirectories. 294177633Sdfr */ 295177633Sdfrstatic int 296177633Sdfrsearchdir(ino_t ino, ufs_daddr_t blkno, long size, long filesize, 297177633Sdfr long *tapesize, int nodump) 298177633Sdfr{ 299177633Sdfr struct direct *dp; 300177633Sdfr struct dinode *ip; 301177633Sdfr long loc, ret = 0; 302177633Sdfr char dblk[MAXBSIZE]; 303177633Sdfr 304177633Sdfr bread(fsbtodb(sblock, blkno), dblk, (int)size); 305180025Sdfr if (filesize < size) 306180025Sdfr size = filesize; 307177633Sdfr for (loc = 0; loc < size; ) { 308177633Sdfr dp = (struct direct *)(dblk + loc); 309177633Sdfr if (dp->d_reclen == 0) { 310180025Sdfr msg("corrupted directory, inumber %d\n", ino); 311180025Sdfr break; 312180025Sdfr } 313180025Sdfr loc += dp->d_reclen; 314177633Sdfr if (dp->d_ino == 0) 315177633Sdfr continue; 316177633Sdfr if (dp->d_name[0] == '.') { 317177633Sdfr if (dp->d_name[1] == '\0') 318177633Sdfr continue; 319177633Sdfr if (dp->d_name[1] == '.' && dp->d_name[2] == '\0') 320177633Sdfr continue; 321177633Sdfr } 322177633Sdfr if (nodump) { 323177633Sdfr ip = getino(dp->d_ino); 324177633Sdfr if (TSTINO(dp->d_ino, dumpinomap)) { 325177633Sdfr CLRINO(dp->d_ino, dumpinomap); 326177633Sdfr *tapesize -= blockest(ip); 327177633Sdfr } 328177633Sdfr /* 329177633Sdfr * Add back to dumpdirmap and remove from usedinomap 330177633Sdfr * to propagate nodump. 331180025Sdfr */ 332180025Sdfr if ((ip->di_mode & IFMT) == IFDIR) { 333177633Sdfr SETINO(dp->d_ino, dumpdirmap); 334177633Sdfr CLRINO(dp->d_ino, usedinomap); 335177633Sdfr ret |= HASSUBDIRS; 336180025Sdfr } 337180025Sdfr } else { 338180025Sdfr if (TSTINO(dp->d_ino, dumpinomap)) { 339180025Sdfr ret |= HASDUMPEDFILE; 340177633Sdfr if (ret & HASSUBDIRS) 341177633Sdfr break; 342177633Sdfr } 343177633Sdfr if (TSTINO(dp->d_ino, dumpdirmap)) { 344177633Sdfr ret |= HASSUBDIRS; 345177633Sdfr if (ret & HASDUMPEDFILE) 346177633Sdfr break; 347177633Sdfr } 348177633Sdfr } 349177633Sdfr } 350177633Sdfr return (ret); 351177633Sdfr} 352177633Sdfr 353177633Sdfr/* 354177633Sdfr * Dump passes 3 and 4. 355177633Sdfr * 356177633Sdfr * Dump the contents of an inode to tape. 357177633Sdfr */ 358180025Sdfrvoid 359180025Sdfrdumpino(struct dinode *dp, ino_t ino) 360177633Sdfr{ 361177633Sdfr int ind_level, cnt; 362177633Sdfr fsizeT size; 363180025Sdfr char buf[TP_BSIZE]; 364180025Sdfr 365180025Sdfr if (newtape) { 366180025Sdfr newtape = 0; 367177633Sdfr dumpmap(dumpinomap, TS_BITS, ino); 368177633Sdfr } 369177633Sdfr CLRINO(ino, dumpinomap); 370177633Sdfr spcl.c_dinode = *dp; 371177633Sdfr spcl.c_type = TS_INODE; 372177633Sdfr spcl.c_count = 0; 373177633Sdfr switch (dp->di_mode & S_IFMT) { 374177633Sdfr 375177633Sdfr case 0: 376177633Sdfr /* 377177633Sdfr * Freed inode. 378177633Sdfr */ 379177633Sdfr return; 380177633Sdfr 381177633Sdfr case S_IFLNK: 382177633Sdfr /* 383177633Sdfr * Check for short symbolic link. 384177633Sdfr */ 385177633Sdfr#ifdef FS_44INODEFMT 386177633Sdfr if (dp->di_size > 0 && 387177633Sdfr dp->di_size < sblock->fs_maxsymlinklen) { 388177633Sdfr spcl.c_addr[0] = 1; 389177633Sdfr spcl.c_count = 1; 390177633Sdfr writeheader(ino); 391177633Sdfr memmove(buf, dp->di_shortlink, (u_long)dp->di_size); 392177633Sdfr buf[dp->di_size] = '\0'; 393177633Sdfr writerec(buf, 0); 394177633Sdfr return; 395177633Sdfr } 396177633Sdfr#endif 397177633Sdfr /* fall through */ 398177633Sdfr 399177633Sdfr case S_IFDIR: 400177633Sdfr case S_IFREG: 401177633Sdfr if (dp->di_size > 0) 402177633Sdfr break; 403177633Sdfr /* fall through */ 404177633Sdfr 405177633Sdfr case S_IFIFO: 406177633Sdfr case S_IFSOCK: 407177633Sdfr case S_IFCHR: 408177633Sdfr case S_IFBLK: 409177633Sdfr writeheader(ino); 410177633Sdfr return; 411177633Sdfr 412177633Sdfr default: 413177633Sdfr msg("Warning: undefined file type 0%o\n", dp->di_mode & IFMT); 414177633Sdfr return; 415177633Sdfr } 416177633Sdfr if (dp->di_size > NDADDR * sblock->fs_bsize) 417177633Sdfr cnt = NDADDR * sblock->fs_frag; 418177633Sdfr else 419177633Sdfr cnt = howmany(dp->di_size, sblock->fs_fsize); 420177633Sdfr blksout(&dp->di_db[0], cnt, ino); 421177633Sdfr if ((size = dp->di_size - NDADDR * sblock->fs_bsize) <= 0) 422177633Sdfr return; 423177633Sdfr for (ind_level = 0; ind_level < NIADDR; ind_level++) { 424177633Sdfr dmpindir(ino, dp->di_ib[ind_level], ind_level, &size); 425177633Sdfr if (size <= 0) 426177633Sdfr return; 427177633Sdfr } 428177633Sdfr} 429177633Sdfr 430177633Sdfr/* 431177633Sdfr * Read indirect blocks, and pass the data blocks to be dumped. 432177633Sdfr */ 433177633Sdfrstatic void 434177633Sdfrdmpindir(ino_t ino, ufs_daddr_t blk, int ind_level, fsizeT *size) 435177633Sdfr{ 436177633Sdfr int i, cnt; 437177633Sdfr ufs_daddr_t idblk[MAXNINDIR]; 438177633Sdfr 439177633Sdfr if (blk != 0) 440177633Sdfr bread(fsbtodb(sblock, blk), (char *)idblk, (int) sblock->fs_bsize); 441177633Sdfr else 442177633Sdfr memset(idblk, 0, (int)sblock->fs_bsize); 443177633Sdfr if (ind_level <= 0) { 444177633Sdfr if (*size < NINDIR(sblock) * sblock->fs_bsize) 445177633Sdfr cnt = howmany(*size, sblock->fs_fsize); 446177633Sdfr else 447177633Sdfr cnt = NINDIR(sblock) * sblock->fs_frag; 448177633Sdfr *size -= NINDIR(sblock) * sblock->fs_bsize; 449177633Sdfr blksout(&idblk[0], cnt, ino); 450177633Sdfr return; 451177633Sdfr } 452177633Sdfr ind_level--; 453177633Sdfr for (i = 0; i < NINDIR(sblock); i++) { 454177633Sdfr dmpindir(ino, idblk[i], ind_level, size); 455177633Sdfr if (*size <= 0) 456177633Sdfr return; 457177633Sdfr } 458177633Sdfr} 459177633Sdfr 460177633Sdfr/* 461177633Sdfr * Collect up the data into tape record sized buffers and output them. 462177633Sdfr */ 463177633Sdfrvoid 464177633Sdfrblksout(ufs_daddr_t *blkp, int frags, ino_t ino) 465177633Sdfr{ 466177633Sdfr ufs_daddr_t *bp; 467177633Sdfr int i, j, count, blks, tbperdb; 468177633Sdfr 469177633Sdfr blks = howmany(frags * sblock->fs_fsize, TP_BSIZE); 470177633Sdfr tbperdb = sblock->fs_bsize >> tp_bshift; 471177633Sdfr for (i = 0; i < blks; i += TP_NINDIR) { 472177633Sdfr if (i + TP_NINDIR > blks) 473177633Sdfr count = blks; 474177633Sdfr else 475177633Sdfr count = i + TP_NINDIR; 476177633Sdfr for (j = i; j < count; j++) 477177633Sdfr if (blkp[j / tbperdb] != 0) 478177633Sdfr spcl.c_addr[j - i] = 1; 479177633Sdfr else 480177633Sdfr spcl.c_addr[j - i] = 0; 481177633Sdfr spcl.c_count = count - i; 482177633Sdfr writeheader(ino); 483177633Sdfr bp = &blkp[i / tbperdb]; 484177633Sdfr for (j = i; j < count; j += tbperdb, bp++) 485177633Sdfr if (*bp != 0) { 486177633Sdfr if (j + tbperdb <= count) 487177633Sdfr dumpblock(*bp, (int)sblock->fs_bsize); 488177633Sdfr else 489177633Sdfr dumpblock(*bp, (count - j) * TP_BSIZE); 490177633Sdfr } 491177633Sdfr spcl.c_type = TS_ADDR; 492177633Sdfr } 493177633Sdfr} 494177633Sdfr 495177633Sdfr/* 496177633Sdfr * Dump a map to the tape. 497177633Sdfr */ 498177633Sdfrvoid 499177633Sdfrdumpmap(char *map, int type, ino_t ino) 500177633Sdfr{ 501177633Sdfr int i; 502177633Sdfr char *cp; 503177633Sdfr 504177633Sdfr spcl.c_type = type; 505177633Sdfr spcl.c_count = howmany(mapsize * sizeof(char), TP_BSIZE); 506177633Sdfr writeheader(ino); 507177633Sdfr for (i = 0, cp = map; i < spcl.c_count; i++, cp += TP_BSIZE) 508177633Sdfr writerec(cp, 0); 509177633Sdfr} 510177633Sdfr 511177633Sdfr/* 512177633Sdfr * Write a header record to the dump tape. 513177633Sdfr */ 514177633Sdfrvoid 515177633Sdfrwriteheader(ino_t ino) 516180025Sdfr{ 517177633Sdfr int32_t sum, cnt, *lp; 518177633Sdfr 519177633Sdfr spcl.c_inumber = ino; 520177633Sdfr spcl.c_magic = NFS_MAGIC; 521177633Sdfr spcl.c_checksum = 0; 522177633Sdfr lp = (int32_t *)&spcl; 523177633Sdfr sum = 0; 524180025Sdfr cnt = sizeof(union u_spcl) / (4 * sizeof(int32_t)); 525177633Sdfr while (--cnt >= 0) { 526177633Sdfr sum += *lp++; 527177633Sdfr sum += *lp++; 528177633Sdfr sum += *lp++; 529177633Sdfr sum += *lp++; 530177633Sdfr } 531177633Sdfr spcl.c_checksum = CHECKSUM - sum; 532180025Sdfr writerec((char *)&spcl, 1); 533177633Sdfr} 534177633Sdfr 535177633Sdfrstruct dinode * 536177633Sdfrgetino(ino_t inum) 537177633Sdfr{ 538177633Sdfr static ufs_daddr_t minino, maxino; 539177633Sdfr static struct dinode inoblock[MAXINOPB]; 540180025Sdfr 541177633Sdfr curino = inum; 542177633Sdfr if (inum >= minino && inum < maxino) 543177633Sdfr return (&inoblock[inum - minino]); 544177633Sdfr bread(fsbtodb(sblock, ino_to_fsba(sblock, inum)), (char *)inoblock, 545177633Sdfr (int)sblock->fs_bsize); 546177633Sdfr minino = inum - (inum % INOPB(sblock)); 547177633Sdfr maxino = minino + INOPB(sblock); 548180025Sdfr return (&inoblock[inum - minino]); 549177633Sdfr} 550177633Sdfr 551177633Sdfr/* 552177633Sdfr * Read a chunk of data from the disk. 553177633Sdfr * Try to recover from hard errors by reading in sector sized pieces. 554177633Sdfr * Error recovery is attempted at most BREADEMAX times before seeking 555177633Sdfr * consent from the operator to continue. 556177633Sdfr */ 557177633Sdfrint breaderrors = 0; 558177633Sdfr#define BREADEMAX 32 559180025Sdfr 560180025Sdfrvoid 561180025Sdfrbread(ufs_daddr_t blkno, char *buf, int size) 562180025Sdfr{ 563180025Sdfr int cnt, i; 564180025Sdfr 565177633Sdfrloop: 566177633Sdfr if ((cnt = pread(diskfd, buf, size, ((off_t)blkno << dev_bshift))) == 567177633Sdfr size) 568177633Sdfr return; 569177633Sdfr if (blkno + (size / dev_bsize) > fsbtodb(sblock, sblock->fs_size)) { 570177633Sdfr /* 571177633Sdfr * Trying to read the final fragment. 572177633Sdfr * 573177633Sdfr * NB - dump only works in TP_BSIZE blocks, hence 574177633Sdfr * rounds `dev_bsize' fragments up to TP_BSIZE pieces. 575177633Sdfr * It should be smarter about not actually trying to 576177633Sdfr * read more than it can get, but for the time being 577180025Sdfr * we punt and scale back the read only when it gets 578180025Sdfr * us into trouble. (mkm 9/25/83) 579180025Sdfr */ 580180025Sdfr size -= dev_bsize; 581180025Sdfr goto loop; 582180025Sdfr } 583177633Sdfr if (cnt == -1) 584177633Sdfr msg("read error from %s: %s: [block %d]: count=%d\n", 585177633Sdfr disk, strerror(errno), blkno, size); 586177633Sdfr else 587177633Sdfr msg("short read error from %s: [block %d]: count=%d, got=%d\n", 588177633Sdfr disk, blkno, size, cnt); 589177633Sdfr if (++breaderrors > BREADEMAX) { 590177633Sdfr msg("More than %d block read errors from %d\n", 591177633Sdfr BREADEMAX, disk); 592177633Sdfr broadcast("DUMP IS AILING!\n"); 593177633Sdfr msg("This is an unrecoverable error.\n"); 594177633Sdfr if (!query("Do you want to attempt to continue?")){ 595180025Sdfr dumpabort(0); 596180025Sdfr /*NOTREACHED*/ 597180025Sdfr } else 598180025Sdfr breaderrors = 0; 599180025Sdfr } 600180025Sdfr /* 601177633Sdfr * Zero buffer, then try to read each sector of buffer separately. 602177633Sdfr */ 603177633Sdfr memset(buf, 0, size); 604177633Sdfr for (i = 0; i < size; i += dev_bsize, buf += dev_bsize, blkno++) { 605177633Sdfr if ((cnt = pread(diskfd, buf, (int)dev_bsize, 606177633Sdfr ((off_t)blkno << dev_bshift))) == dev_bsize) 607177633Sdfr continue; 608177633Sdfr if (cnt == -1) { 609177633Sdfr msg("read error from %s: %s: [sector %d]: count=%d\n", 610177633Sdfr disk, strerror(errno), blkno, dev_bsize); 611177633Sdfr continue; 612177633Sdfr } 613180025Sdfr msg("short read error from %s: [sector %d]: count=%d, got=%d\n", 614182153Sdfr disk, blkno, dev_bsize, cnt); 615180025Sdfr } 616180025Sdfr} 617180025Sdfr