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Exclude directory entries to non-dumped inodes from the dump.
[dump.git] / dump / traverse.c
1 /*
2 * Ported to Linux's Second Extended File System as part of the
3 * dump and restore backup suit
4 * Remy Card <card@Linux.EU.Org>, 1994-1997
5 * Stelian Pop <stelian@popies.net>, 1999-2000
6 * Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
7 */
8
9 /*-
10 * Copyright (c) 1980, 1988, 1991, 1993
11 * The Regents of the University of California. All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #ifndef lint
39 static const char rcsid[] =
40 "$Id: traverse.c,v 1.62 2004/11/22 10:22:43 stelian Exp $";
41 #endif /* not lint */
42
43 #include <config.h>
44 #include <ctype.h>
45 #include <stdio.h>
46 #include <sys/types.h>
47 #ifdef __STDC__
48 #include <string.h>
49 #include <unistd.h>
50 #endif
51 #include <errno.h>
52
53 #include <sys/param.h>
54 #include <sys/stat.h>
55 #ifdef __linux__
56 #ifdef HAVE_EXT2FS_EXT2_FS_H
57 #include <ext2fs/ext2_fs.h>
58 #else
59 #include <linux/ext2_fs.h>
60 #endif
61 #include <ext2fs/ext2fs.h>
62 #include <bsdcompat.h>
63 #include <compaterr.h>
64 #include <stdlib.h>
65 #elif defined sunos
66 #include <sys/vnode.h>
67
68 #include <ufs/fs.h>
69 #include <ufs/fsdir.h>
70 #include <ufs/inode.h>
71 #else
72 #include <ufs/ufs/dir.h>
73 #include <ufs/ufs/dinode.h>
74 #include <ufs/ffs/fs.h>
75 #endif /* __linux__ */
76
77 #include <protocols/dumprestore.h>
78
79 #include "dump.h"
80
81 #define HASDUMPEDFILE 0x1
82 #define HASSUBDIRS 0x2
83
84 #ifdef __linux__
85 typedef u_quad_t fsizeT;
86 #else
87 #ifdef FS_44INODEFMT
88 typedef quad_t fsizeT;
89 #else
90 typedef long fsizeT;
91 #endif
92 #endif
93
94 #ifdef __linux__
95 static int searchdir __P((struct ext2_dir_entry *dp, int offset,
96 int blocksize, char *buf, void *private));
97 #else
98 static int dirindir __P((dump_ino_t ino, daddr_t blkno, int level, long *size));
99 static void dmpindir __P((dump_ino_t ino, daddr_t blk, int level, fsizeT *size));
100 static int searchdir __P((dump_ino_t ino, daddr_t blkno, long size, long filesize));
101 #endif
102 static void mapfileino __P((dump_ino_t ino, struct dinode const *dp, long *tapesize, int *dirskipped));
103
104 #ifdef HAVE_EXT2_JOURNAL_INUM
105 #define ext2_journal_ino(sb) (sb->s_journal_inum)
106 #else
107 #define ext2_journal_ino(sb) (*((u_int32_t *)sb + 0x38))
108 #endif
109 #ifndef HAVE_EXT2_INO_T
110 typedef ino_t ext2_ino_t;
111 #endif
112
113 #ifndef EXT3_FEATURE_COMPAT_HAS_JOURNAL
114 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
115 #endif
116 #ifndef EXT2_FEATURE_INCOMPAT_FILETYPE
117 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
118 #endif
119 #ifndef EXT3_FEATURE_INCOMPAT_RECOVER
120 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
121 #endif
122 #ifndef EXT3_FEATURE_INCOMPAT_JOURNAL_DEV
123 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
124 #endif
125
126 #ifndef EXT2_LIB_FEATURE_INCOMPAT_SUPP
127 #define EXT2_LIB_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_RECOVER | \
128 EXT2_FEATURE_INCOMPAT_FILETYPE)
129 #endif
130 #ifndef EXT2_RESIZE_INO
131 #define EXT2_RESIZE_INO 7
132 #endif
133 #ifndef EXT2_FT_UNKNOWN
134 #define EXT2_FT_UNKNOWN 0
135 #define EXT2_FT_REG_FILE 1
136 #define EXT2_FT_DIR 2
137 #define EXT2_FT_CHRDEV 3
138 #define EXT2_FT_BLKDEV 4
139 #define EXT2_FT_FIFO 5
140 #define EXT2_FT_SOCK 6
141 #define EXT2_FT_SYMLINK 7
142 #define EXT2_FT_MAX 8
143 #endif
144
145 int dump_fs_open(const char *disk, ext2_filsys *fs)
146 {
147 int retval;
148
149 retval = ext2fs_open(disk, EXT2_FLAG_FORCE, 0, 0, unix_io_manager, fs);
150 if (!retval) {
151 struct ext2_super_block *es = (*fs)->super;
152 dump_ino_t journal_ino = ext2_journal_ino(es);
153
154 if (es->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV){
155 msg("This is a journal, not a filesystem!\n");
156 retval = EXT2_ET_UNSUPP_FEATURE;
157 ext2fs_close(*fs);
158 }
159 else if ((retval = es->s_feature_incompat &
160 ~(EXT2_LIB_FEATURE_INCOMPAT_SUPP |
161 EXT3_FEATURE_INCOMPAT_RECOVER))) {
162 msg("Unsupported feature(s) 0x%x in filesystem\n",
163 retval);
164 retval = EXT2_ET_UNSUPP_FEATURE;
165 ext2fs_close(*fs);
166 }
167 else {
168 if (es->s_feature_compat &
169 EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
170 journal_ino)
171 do_exclude_ino(journal_ino, "journal inode");
172 do_exclude_ino(EXT2_RESIZE_INO, "resize inode");
173 }
174 }
175 return retval;
176 }
177
178 /*
179 * This is an estimation of the number of TP_BSIZE blocks in the file.
180 * It estimates the number of blocks in files with holes by assuming
181 * that all of the blocks accounted for by di_blocks are data blocks
182 * (when some of the blocks are usually used for indirect pointers);
183 * hence the estimate may be high.
184 */
185 long
186 blockest(struct dinode const *dp)
187 {
188 long blkest, sizeest;
189 u_quad_t i_size;
190
191 /*
192 * dp->di_size is the size of the file in bytes.
193 * dp->di_blocks stores the number of sectors actually in the file.
194 * If there are more sectors than the size would indicate, this just
195 * means that there are indirect blocks in the file or unused
196 * sectors in the last file block; we can safely ignore these
197 * (blkest = sizeest below).
198 * If the file is bigger than the number of sectors would indicate,
199 * then the file has holes in it. In this case we must use the
200 * block count to estimate the number of data blocks used, but
201 * we use the actual size for estimating the number of indirect
202 * dump blocks (sizeest vs. blkest in the indirect block
203 * calculation).
204 */
205 blkest = howmany((u_quad_t)dp->di_blocks * 512, fs->blocksize) * (fs->blocksize / TP_BSIZE);
206 i_size = dp->di_size + ((u_quad_t) dp->di_size_high << 32);
207 sizeest = howmany(i_size, fs->blocksize) * (fs->blocksize / TP_BSIZE);
208 if (blkest > sizeest)
209 blkest = sizeest;
210 #ifdef __linux__
211 if ((dp->di_mode & IFMT) == IFDIR) {
212 /*
213 * for directories, assume only half of space is filled
214 * with entries.
215 */
216 blkest = blkest / 2;
217 sizeest = sizeest / 2;
218 }
219 if (i_size > (u_quad_t)fs->blocksize * NDADDR) {
220 /* calculate the number of indirect blocks on the dump tape */
221 blkest +=
222 howmany(sizeest - NDADDR * fs->blocksize / TP_BSIZE,
223 TP_NINDIR);
224 }
225 #else
226 if (i_size > sblock->fs_bsize * NDADDR) {
227 /* calculate the number of indirect blocks on the dump tape */
228 blkest +=
229 howmany(sizeest - NDADDR * sblock->fs_bsize / TP_BSIZE,
230 TP_NINDIR);
231 }
232 #endif
233 return (blkest + 1);
234 }
235
236 /* Auxiliary macro to pick up files changed since previous dump. */
237 #define CSINCE(dp, t) \
238 ((dp)->di_ctime >= (t))
239 #define MSINCE(dp, t) \
240 ((dp)->di_mtime >= (t))
241 #define CHANGEDSINCE(dp, t) \
242 (CSINCE(dp, t) || MSINCE(dp, t))
243
244 /* The NODUMP_FLAG macro tests if a file has the nodump flag. */
245 #ifdef UF_NODUMP
246 #define NODUMP_FLAG(dp) (!nonodump && (((dp)->di_flags & UF_NODUMP) == UF_NODUMP))
247 #else
248 #define NODUMP_FLAG(dp) 0
249 #endif
250
251 /* The WANTTODUMP macro decides whether a file should be dumped. */
252 #define WANTTODUMP(dp, ino) \
253 (CHANGEDSINCE(dp, ((u_int32_t)spcl.c_ddate)) && \
254 (!NODUMP_FLAG(dp)) && \
255 (!exclude_ino(ino)))
256
257 /*
258 * Determine if given inode should be dumped. "dp" must either point to a
259 * copy of the given inode, or be NULL (in which case it is fetched.)
260 */
261 static void
262 mapfileino(dump_ino_t ino, struct dinode const *dp, long *tapesize, int *dirskipped)
263 {
264 int mode;
265
266 /*
267 * Skip inode if we've already marked it for dumping
268 */
269 if (TSTINO(ino, usedinomap))
270 return;
271 if (!dp)
272 dp = getino(ino);
273 if ((mode = (dp->di_mode & IFMT)) == 0)
274 return;
275 #ifdef __linux__
276 if (dp->di_nlink == 0 || dp->di_dtime != 0)
277 return;
278 #endif
279 /*
280 * Put all dirs in dumpdirmap, inodes that are to be dumped in the
281 * used map. All inode but dirs who have the nodump attribute go
282 * to the usedinomap.
283 */
284 SETINO(ino, usedinomap);
285
286 if (mode == IFDIR)
287 SETINO(ino, dumpdirmap);
288 if (WANTTODUMP(dp, ino)) {
289 SETINO(ino, dumpinomap);
290 if (!MSINCE(dp, (u_int32_t)spcl.c_ddate))
291 SETINO(ino, metainomap);
292 if (mode != IFREG && mode != IFDIR && mode != IFLNK)
293 *tapesize += 1;
294 else
295 *tapesize += blockest(dp);
296 return;
297 }
298 if (mode == IFDIR) {
299 if ( NODUMP_FLAG(dp) || exclude_ino(ino) )
300 CLRINO(ino, usedinomap);
301 *dirskipped = 1;
302 }
303 }
304
305 /*
306 * Dump pass 1.
307 *
308 * Walk the inode list for a filesystem to find all allocated inodes
309 * that have been modified since the previous dump time. Also, find all
310 * the directories in the filesystem.
311 */
312 #ifdef __linux__
313 int
314 mapfiles(UNUSED(dump_ino_t maxino), long *tapesize)
315 {
316 ext2_ino_t ino;
317 int anydirskipped = 0;
318 ext2_inode_scan scan;
319 errcode_t err;
320 struct ext2_inode inode;
321
322 /*
323 * We use libext2fs's inode scanning routines, which are particularly
324 * robust. (Note that getino cannot return an error.)
325 */
326 err = ext2fs_open_inode_scan(fs, 0, &scan);
327 if (err) {
328 com_err(disk, err, "while opening inodes\n");
329 exit(X_ABORT);
330 }
331 for (;;) {
332 err = ext2fs_get_next_inode(scan, &ino, &inode);
333 if (err == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
334 continue;
335 if (err) {
336 com_err(disk, err, "while scanning inode #%ld\n",
337 (long)ino);
338 exit(X_ABORT);
339 }
340 if (ino == 0)
341 break;
342
343 curino = ino;
344 mapfileino(ino, (struct dinode const *)&inode, tapesize,
345 &anydirskipped);
346 }
347 ext2fs_close_inode_scan(scan);
348
349 /*
350 * Restore gets very upset if the root is not dumped,
351 * so ensure that it always is dumped.
352 */
353 SETINO(ROOTINO, dumpinomap);
354 return (anydirskipped);
355 }
356 #else
357 int
358 mapfiles(dump_ino_t maxino, long *tapesize)
359 {
360 dump_ino_t ino;
361 int anydirskipped = 0;
362
363 for (ino = ROOTINO; ino < maxino; ino++)
364 mapfileino(ino, tapesize, &anydirskipped);
365
366 /*
367 * Restore gets very upset if the root is not dumped,
368 * so ensure that it always is dumped.
369 */
370 SETINO(ROOTINO, dumpinomap);
371 return (anydirskipped);
372 }
373 #endif /* __linux__ */
374
375 #ifdef __linux__
376 int
377 maponefile(UNUSED(dump_ino_t maxino), long *tapesize, char *directory)
378 {
379 errcode_t retval;
380 ext2_ino_t dir_ino;
381 char dir_name [MAXPATHLEN];
382 int i, anydirskipped = 0;
383
384 /*
385 * Mark every directory in the path as being dumped
386 */
387 for (i = 0; i < (int)strlen (directory); i++) {
388 if (directory[i] == '/') {
389 strncpy (dir_name, directory, i);
390 dir_name[i] = '\0';
391 retval = ext2fs_namei(fs, ROOTINO, ROOTINO,
392 dir_name, &dir_ino);
393 if (retval) {
394 com_err(disk, retval,
395 "while translating %s", dir_name);
396 exit(X_ABORT);
397 }
398 mapfileino((dump_ino_t) dir_ino, 0,
399 tapesize, &anydirskipped);
400 }
401 }
402 /*
403 * Mark the final directory
404 */
405 retval = ext2fs_namei(fs, ROOTINO, ROOTINO, directory, &dir_ino);
406 if (retval) {
407 com_err(disk, retval, "while translating %s", directory);
408 exit(X_ABORT);
409 }
410 mapfileino((dump_ino_t)dir_ino, 0, tapesize, &anydirskipped);
411
412 mapfileino(ROOTINO, 0, tapesize, &anydirskipped);
413
414 /*
415 * Restore gets very upset if the root is not dumped,
416 * so ensure that it always is dumped.
417 */
418 SETINO(ROOTINO, dumpdirmap);
419 return anydirskipped;
420 }
421 #endif /* __linux__ */
422
423 #ifdef __linux__
424 struct mapfile_context {
425 long *tapesize;
426 int *anydirskipped;
427 };
428
429 static int
430 mapfilesindir(struct ext2_dir_entry *dirent, UNUSED(int offset),
431 UNUSED(int blocksize), UNUSED(char *buf), void *private)
432 {
433 struct dinode const *dp;
434 int mode;
435 errcode_t retval;
436 struct mapfile_context *mfc;
437 ext2_ino_t ino;
438
439 ino = dirent->inode;
440 mfc = (struct mapfile_context *)private;
441 dp = getino(dirent->inode);
442
443 mapfileino(dirent->inode, dp, mfc->tapesize, mfc->anydirskipped);
444
445 mode = dp->di_mode & IFMT;
446 if (mode == IFDIR && dp->di_nlink != 0 && dp->di_dtime == 0) {
447 if ((dirent->name[0] != '.' || ( dirent->name_len & 0xFF ) != 1) &&
448 (dirent->name[0] != '.' || dirent->name[1] != '.' ||
449 ( dirent->name_len & 0xFF ) != 2)) {
450 retval = ext2fs_dir_iterate(fs, ino, 0, NULL,
451 mapfilesindir, private);
452 if (retval)
453 return retval;
454 }
455 }
456 return 0;
457 }
458
459 /*
460 * Dump pass 1.
461 *
462 * Walk the inode list for a filesystem to find all allocated inodes
463 * that have been modified since the previous dump time. Also, find all
464 * the directories in the filesystem.
465 */
466 int
467 mapfilesfromdir(UNUSED(dump_ino_t maxino), long *tapesize, char *directory)
468 {
469 errcode_t retval;
470 struct mapfile_context mfc;
471 ext2_ino_t dir_ino;
472 char dir_name [MAXPATHLEN];
473 int i, anydirskipped = 0;
474
475 /*
476 * Mark every directory in the path as being dumped
477 */
478 for (i = 0; i < (int)strlen (directory); i++) {
479 if (directory[i] == '/') {
480 strncpy (dir_name, directory, i);
481 dir_name[i] = '\0';
482 retval = ext2fs_namei(fs, ROOTINO, ROOTINO, dir_name,
483 &dir_ino);
484 if (retval) {
485 com_err(disk, retval, "while translating %s",
486 dir_name);
487 exit(X_ABORT);
488 }
489 mapfileino(dir_ino, 0, tapesize, &anydirskipped);
490 }
491 }
492 /*
493 * Mark the final directory
494 */
495 retval = ext2fs_namei(fs, ROOTINO, ROOTINO, directory, &dir_ino);
496 if (retval) {
497 com_err(disk, retval, "while translating %s", directory);
498 exit(X_ABORT);
499 }
500 mapfileino(dir_ino, 0, tapesize, &anydirskipped);
501
502 mfc.tapesize = tapesize;
503 mfc.anydirskipped = &anydirskipped;
504 retval = ext2fs_dir_iterate(fs, dir_ino, 0, NULL, mapfilesindir,
505 (void *)&mfc);
506
507 if (retval) {
508 com_err(disk, retval, "while mapping files in %s", directory);
509 exit(X_ABORT);
510 }
511 /*
512 * Ensure that the root inode actually appears in the file list
513 * for a subdir
514 */
515 mapfileino(ROOTINO, 0, tapesize, &anydirskipped);
516 /*
517 * Restore gets very upset if the root is not dumped,
518 * so ensure that it always is dumped.
519 */
520 SETINO(ROOTINO, dumpinomap);
521 return anydirskipped;
522 }
523 #endif
524
525 #ifdef __linux__
526 struct mapdirs_context {
527 int *ret;
528 int nodump;
529 long *tapesize;
530 };
531 #endif
532
533 /*
534 * Dump pass 2.
535 *
536 * Scan each directory on the filesystem to see if it has any modified
537 * files in it. If it does, and has not already been added to the dump
538 * list (because it was itself modified), then add it. If a directory
539 * has not been modified itself, contains no modified files and has no
540 * subdirectories, then it can be deleted from the dump list and from
541 * the list of directories. By deleting it from the list of directories,
542 * its parent may now qualify for the same treatment on this or a later
543 * pass using this algorithm.
544 */
545 int
546 mapdirs(dump_ino_t maxino, long *tapesize)
547 {
548 struct dinode *dp;
549 int isdir;
550 char *map;
551 dump_ino_t ino;
552 #ifndef __linux__
553 int i;
554 long filesize;
555 #else
556 struct mapdirs_context mdc;
557 #endif
558 int ret, change = 0, nodump;
559
560 isdir = 0; /* XXX just to get gcc to shut up */
561 for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
562 if (((ino - 1) % NBBY) == 0) /* map is offset by 1 */
563 isdir = *map++;
564 else
565 isdir >>= 1;
566 /*
567 * If dir has been removed from the used map, it's either
568 * because it had the nodump flag, or it herited it from
569 * its parent. A directory can't be in dumpinomap if not
570 * in usedinomap, but we have to go through it anyway
571 * to propagate the nodump attribute.
572 */
573 nodump = (TSTINO(ino, usedinomap) == 0);
574 if ((isdir & 1) == 0 ||
575 (TSTINO(ino, dumpinomap) && nodump == 0))
576 continue;
577 dp = getino(ino);
578 #ifdef __linux__
579 ret = 0;
580 mdc.ret = &ret;
581 mdc.nodump = nodump;
582 mdc.tapesize = tapesize;
583 ext2fs_dir_iterate(fs, ino, 0, NULL, searchdir, (void *) &mdc);
584 #else /* __linux__ */
585 filesize = dp->di_size;
586 for (ret = 0, i = 0; filesize > 0 && i < NDADDR; i++) {
587 if (dp->di_db[i] != 0)
588 ret |= searchdir(ino, dp->di_db[i],
589 (long)dblksize(sblock, dp, i),
590 filesize);
591 if (ret & HASDUMPEDFILE)
592 filesize = 0;
593 else
594 filesize -= sblock->fs_bsize;
595 }
596 for (i = 0; filesize > 0 && i < NIADDR; i++) {
597 if (dp->di_ib[i] == 0)
598 continue;
599 ret |= dirindir(ino, dp->di_ib[i], i, &filesize);
600 }
601 #endif /* __linux__ */
602 if (ret & HASDUMPEDFILE) {
603 SETINO(ino, dumpinomap);
604 *tapesize += blockest(dp);
605 change = 1;
606 continue;
607 }
608 if (nodump) {
609 if (ret & HASSUBDIRS)
610 change = 1; /* subdirs have inherited nodump */
611 CLRINO(ino, dumpdirmap);
612 } else if ((ret & HASSUBDIRS) == 0) {
613 if (!TSTINO(ino, dumpinomap)) {
614 CLRINO(ino, dumpdirmap);
615 change = 1;
616 }
617 }
618 }
619 return (change);
620 }
621
622 #ifndef __linux__
623 /*
624 * Read indirect blocks, and pass the data blocks to be searched
625 * as directories. Quit as soon as any entry is found that will
626 * require the directory to be dumped.
627 */
628 static int
629 dirindir(dump_ino_t ino, daddr_t blkno, int ind_level, long *filesize)
630 {
631 int ret = 0;
632 int i;
633 daddr_t idblk[MAXNINDIR];
634
635 bread(fsbtodb(sblock, blkno), (char *)idblk, (int)sblock->fs_bsize);
636 if (ind_level <= 0) {
637 for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) {
638 blkno = idblk[i];
639 if (blkno != 0)
640 ret |= searchdir(ino, blkno, sblock->fs_bsize,
641 *filesize);
642 if (ret & HASDUMPEDFILE)
643 *filesize = 0;
644 else
645 *filesize -= sblock->fs_bsize;
646 }
647 return (ret);
648 }
649 ind_level--;
650 for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) {
651 blkno = idblk[i];
652 if (blkno != 0)
653 ret |= dirindir(ino, blkno, ind_level, filesize);
654 }
655 return (ret);
656 }
657 #endif /* !__linux__ */
658
659 /*
660 * Scan a disk block containing directory information looking to see if
661 * any of the entries are on the dump list and to see if the directory
662 * contains any subdirectories.
663 */
664 #ifdef __linux__
665 static int
666 searchdir(struct ext2_dir_entry *dp, UNUSED(int offset),
667 UNUSED(int blocksize), UNUSED(char *buf), void *private)
668 {
669 struct mapdirs_context *mdc;
670 int *ret;
671 long *tapesize;
672 struct dinode *ip;
673
674 mdc = (struct mapdirs_context *)private;
675 ret = mdc->ret;
676 tapesize = mdc->tapesize;
677
678 if (dp->inode == 0)
679 return 0;
680 if (dp->name[0] == '.') {
681 if (( dp->name_len & 0xFF ) == 1)
682 return 0;
683 if (dp->name[1] == '.' && ( dp->name_len & 0xFF ) == 2)
684 return 0;
685 }
686 if (mdc->nodump) {
687 ip = getino(dp->inode);
688 if (TSTINO(dp->inode, dumpinomap)) {
689 CLRINO(dp->inode, dumpinomap);
690 *tapesize -= blockest(ip);
691 }
692 /* Add dir back to the dir map and remove from
693 * usedinomap to propagate nodump */
694 if ((ip->di_mode & IFMT) == IFDIR) {
695 SETINO(dp->inode, dumpdirmap);
696 CLRINO(dp->inode, usedinomap);
697 *ret |= HASSUBDIRS;
698 }
699 } else {
700 if (TSTINO(dp->inode, dumpinomap)) {
701 *ret |= HASDUMPEDFILE;
702 if (*ret & HASSUBDIRS)
703 return DIRENT_ABORT;
704 }
705 if (TSTINO(dp->inode, dumpdirmap)) {
706 *ret |= HASSUBDIRS;
707 if (*ret & HASDUMPEDFILE)
708 return DIRENT_ABORT;
709 }
710 }
711 return 0;
712 }
713
714 #else /* __linux__ */
715
716 static int
717 searchdir(dump_ino_t ino, daddr_t blkno, long size, long filesize)
718 {
719 struct direct *dp;
720 long loc, ret = 0;
721 char dblk[MAXBSIZE];
722
723 bread(fsbtodb(sblock, blkno), dblk, (int)size);
724 if (filesize < size)
725 size = filesize;
726 for (loc = 0; loc < size; ) {
727 dp = (struct direct *)(dblk + loc);
728 if (dp->d_reclen == 0) {
729 msg("corrupted directory, inumber %d\n", ino);
730 break;
731 }
732 loc += dp->d_reclen;
733 if (dp->d_ino == 0)
734 continue;
735 if (dp->d_name[0] == '.') {
736 if (dp->d_name[1] == '\0')
737 continue;
738 if (dp->d_name[1] == '.' && dp->d_name[2] == '\0')
739 continue;
740 }
741 if (TSTINO(dp->d_ino, dumpinomap)) {
742 ret |= HASDUMPEDFILE;
743 if (ret & HASSUBDIRS)
744 break;
745 }
746 if (TSTINO(dp->d_ino, dumpdirmap)) {
747 ret |= HASSUBDIRS;
748 if (ret & HASDUMPEDFILE)
749 break;
750 }
751 }
752 return (ret);
753 }
754 #endif /* __linux__ */
755
756 #ifdef __linux__
757
758 struct block_context {
759 ext2_ino_t ino;
760 int *buf;
761 int cnt;
762 int max;
763 int next_block;
764 };
765
766 /*
767 * Dump a block to the tape
768 */
769 static int
770 dumponeblock(UNUSED(ext2_filsys fs), blk_t *blocknr, e2_blkcnt_t blockcnt,
771 UNUSED(blk_t ref_block), UNUSED(int ref_offset), void * private)
772 {
773 struct block_context *p;
774 e2_blkcnt_t i;
775
776 if (blockcnt < NDADDR)
777 return 0;
778 p = (struct block_context *)private;
779 for (i = p->next_block; i < blockcnt; i++) {
780 p->buf[p->cnt++] = 0;
781 if (p->cnt == p->max) {
782 blksout (p->buf, p->cnt, p->ino);
783 p->cnt = 0;
784 }
785 }
786 p->buf[p->cnt++] = *blocknr;
787 if (p->cnt == p->max) {
788 blksout (p->buf, p->cnt, p->ino);
789 p->cnt = 0;
790 }
791 p->next_block = blockcnt + 1;
792 return 0;
793 }
794 #endif
795
796 /*
797 * Dump passes 3 and 4.
798 *
799 * Dump the contents of an inode to tape.
800 */
801 void
802 dumpino(struct dinode *dp, dump_ino_t ino, int metaonly)
803 {
804 unsigned long cnt;
805 fsizeT size, remaining;
806 char buf[TP_BSIZE];
807 struct new_bsd_inode nbi;
808 int i;
809 #ifdef __linux__
810 struct block_context bc;
811 #else
812 int ind_level;
813 #endif
814 u_quad_t i_size;
815
816 if (metaonly)
817 i_size = 0;
818 else
819 i_size = dp->di_size + ((u_quad_t) dp->di_size_high << 32);
820
821 if (newtape) {
822 newtape = 0;
823 dumpmap(dumpinomap, TS_BITS, ino);
824 }
825 CLRINO(ino, dumpinomap);
826 #ifdef __linux__
827 memset(&nbi, 0, sizeof(nbi));
828 nbi.di_mode = dp->di_mode;
829 nbi.di_nlink = dp->di_nlink;
830 nbi.di_ouid = dp->di_uid;
831 nbi.di_ogid = dp->di_gid;
832 nbi.di_size = i_size;
833 nbi.di_atime.tv_sec = dp->di_atime;
834 nbi.di_mtime.tv_sec = dp->di_mtime;
835 nbi.di_ctime.tv_sec = dp->di_ctime;
836 memmove(&nbi.di_db, &dp->di_db, (NDADDR + NIADDR) * sizeof(daddr_t));
837 nbi.di_flags = dp->di_flags;
838 nbi.di_blocks = dp->di_blocks;
839 nbi.di_gen = dp->di_gen;
840 nbi.di_uid = (((int32_t)dp->di_uidhigh) << 16) | dp->di_uid;
841 nbi.di_gid = (((int32_t)dp->di_gidhigh) << 16) | dp->di_gid;
842 if (dp->di_file_acl)
843 msg("ACLs in inode #%ld won't be dumped\n", (long)ino);
844 memmove(&spcl.c_dinode, &nbi, sizeof(nbi));
845 #else /* __linux__ */
846 spcl.c_dinode = *dp;
847 #endif /* __linux__ */
848 spcl.c_type = TS_INODE;
849 spcl.c_count = 0;
850
851 if (metaonly && (dp->di_mode & S_IFMT)) {
852 spcl.c_flags |= DR_METAONLY;
853 spcl.c_count = 0;
854 writeheader(ino);
855 spcl.c_flags &= ~DR_METAONLY;
856 return;
857 }
858
859 switch (dp->di_mode & S_IFMT) {
860
861 case 0:
862 /*
863 * Freed inode.
864 */
865 return;
866
867 #ifdef __linux__
868 case S_IFDIR:
869 msg("Warning: dumpino called on a directory (ino %d)\n", ino);
870 return;
871 #endif
872
873 case S_IFLNK:
874 /*
875 * Check for short symbolic link.
876 */
877 #ifdef __linux__
878 if (i_size > 0 &&
879 i_size < EXT2_N_BLOCKS * sizeof (daddr_t)) {
880 spcl.c_addr[0] = 1;
881 spcl.c_count = 1;
882 writeheader(ino);
883 memmove(buf, dp->di_db, (u_long)dp->di_size);
884 buf[dp->di_size] = '\0';
885 writerec(buf, 0);
886 return;
887 }
888 #endif /* __linux__ */
889 #ifdef FS_44INODEFMT
890 if (dp->di_size > 0 &&
891 dp->di_size < sblock->fs_maxsymlinklen) {
892 spcl.c_addr[0] = 1;
893 spcl.c_count = 1;
894 writeheader(ino);
895 memmove(buf, dp->di_shortlink, (u_long)dp->di_size);
896 buf[dp->di_size] = '\0';
897 writerec(buf, 0);
898 return;
899 }
900 #endif
901 /* fall through */
902
903 #ifndef __linux__
904 case S_IFDIR:
905 #endif
906 case S_IFREG:
907 if (i_size)
908 break;
909 /* fall through */
910
911 case S_IFIFO:
912 case S_IFSOCK:
913 case S_IFCHR:
914 case S_IFBLK:
915 writeheader(ino);
916 return;
917
918 default:
919 msg("Warning: undefined file type 0%o\n", dp->di_mode & IFMT);
920 return;
921 }
922 if (i_size > (u_quad_t)NDADDR * sblock->fs_bsize)
923 #ifdef __linux__
924 cnt = NDADDR * EXT2_FRAGS_PER_BLOCK(fs->super);
925 #else
926 cnt = NDADDR * sblock->fs_frag;
927 #endif
928 else
929 cnt = howmany(i_size, sblock->fs_fsize);
930 blksout(&dp->di_db[0], cnt, ino);
931 if ((quad_t) (size = i_size - NDADDR * sblock->fs_bsize) <= 0)
932 return;
933 #ifdef __linux__
934 bc.max = NINDIR(sblock) * EXT2_FRAGS_PER_BLOCK(fs->super);
935 bc.buf = (int *)malloc (bc.max * sizeof (int));
936 bc.cnt = 0;
937 bc.ino = ino;
938 bc.next_block = NDADDR;
939
940 ext2fs_block_iterate2(fs, (ext2_ino_t)ino, 0, NULL, dumponeblock, (void *)&bc);
941 /* deal with holes at the end of the inode */
942 if (i_size > ((u_quad_t)bc.next_block) * sblock->fs_fsize) {
943 remaining = i_size - ((u_quad_t)bc.next_block) * sblock->fs_fsize;
944 for (i = 0; i < (int)howmany(remaining, sblock->fs_fsize); i++) {
945 bc.buf[bc.cnt++] = 0;
946 if (bc.cnt == bc.max) {
947 blksout (bc.buf, bc.cnt, bc.ino);
948 bc.cnt = 0;
949 }
950 }
951 }
952 if (bc.cnt > 0) {
953 blksout (bc.buf, bc.cnt, bc.ino);
954 }
955 free(bc.buf);
956 #else
957 for (ind_level = 0; ind_level < NIADDR; ind_level++) {
958 dmpindir(ino, dp->di_ib[ind_level], ind_level, &size);
959 if (size <= 0)
960 return;
961 }
962 #endif
963 }
964
965 #ifdef __linux__
966
967 struct convert_dir_context {
968 char *buf;
969 int prev_offset;
970 int offset;
971 int bs;
972 };
973
974 /*
975 * This function converts an ext2fs directory entry to the BSD format.
976 *
977 * Basically, it adds a null-character at the end of the name, recomputes the
978 * size of the entry, and creates it in a temporary buffer
979 */
980 static int
981 convert_dir(struct ext2_dir_entry *dirent, UNUSED(int offset),
982 UNUSED(int blocksize), UNUSED(char *buf), void *private)
983 {
984 struct convert_dir_context *p;
985 struct direct *dp;
986 int reclen;
987
988 /* do not save entries to excluded inodes */
989 if (TSTINO(dirent->inode, dumpinomap) == 0 &&
990 TSTINO(dirent->inode, dumpdirmap) == 0)
991 return 0;
992
993 p = (struct convert_dir_context *)private;
994
995 reclen = EXT2_DIR_REC_LEN((dirent->name_len & 0xFF) + 1);
996 if (((p->offset + reclen - 1) / p->bs) != (p->offset / p->bs)) {
997 dp = (struct direct *)(p->buf + p->prev_offset);
998 dp->d_reclen += p->bs - (p->offset % p->bs);
999 p->offset += p->bs - (p->offset % p->bs);
1000 }
1001
1002 dp = (struct direct *)(p->buf + p->offset);
1003 dp->d_ino = dirent->inode;
1004 dp->d_reclen = reclen;
1005 dp->d_namlen = dirent->name_len & 0xFF;
1006 switch ((dirent->name_len & 0xFF00) >> 8) {
1007 default:
1008 dp->d_type = DT_UNKNOWN;
1009 break;
1010 case EXT2_FT_REG_FILE:
1011 dp->d_type = DT_REG;
1012 break;
1013 case EXT2_FT_DIR:
1014 dp->d_type = DT_DIR;
1015 break;
1016 case EXT2_FT_CHRDEV:
1017 dp->d_type = DT_CHR;
1018 break;
1019 case EXT2_FT_BLKDEV:
1020 dp->d_type = DT_BLK;
1021 break;
1022 case EXT2_FT_FIFO:
1023 dp->d_type = DT_FIFO;
1024 break;
1025 case EXT2_FT_SOCK:
1026 dp->d_type = DT_SOCK;
1027 break;
1028 case EXT2_FT_SYMLINK:
1029 dp->d_type = DT_LNK;
1030 break;
1031 }
1032 strncpy(dp->d_name, dirent->name, dp->d_namlen);
1033 dp->d_name[dp->d_namlen] = '\0';
1034 p->prev_offset = p->offset;
1035 p->offset += reclen;
1036
1037 return 0;
1038 }
1039
1040 /*
1041 * Dump pass 3
1042 *
1043 * Dumps a directory to tape after converting it to the BSD format
1044 */
1045 void
1046 dumpdirino(struct dinode *dp, dump_ino_t ino)
1047 {
1048 fsizeT size;
1049 char buf[TP_BSIZE];
1050 struct new_bsd_inode nbi;
1051 struct convert_dir_context cdc;
1052 errcode_t retval;
1053 struct ext2_dir_entry *de;
1054 fsizeT dir_size;
1055
1056 if (newtape) {
1057 newtape = 0;
1058 dumpmap(dumpinomap, TS_BITS, ino);
1059 }
1060 CLRINO(ino, dumpinomap);
1061
1062 /*
1063 * Convert the directory to the BSD format
1064 */
1065 /* Allocate a buffer for the conversion (twice the size of the
1066 ext2fs directory to avoid problems ;-) */
1067 cdc.buf = (char *)malloc(dp->di_size * 2 * sizeof(char));
1068 if (cdc.buf == NULL)
1069 err(1, "Cannot allocate buffer to convert directory #%lu\n",
1070 (unsigned long)ino);
1071 cdc.offset = 0;
1072 cdc.prev_offset = 0;
1073 cdc.bs = MIN(DIRBLKSIZ, TP_BSIZE);
1074 /* Do the conversion */
1075 retval = ext2fs_dir_iterate(fs, (ext2_ino_t)ino, 0, NULL, convert_dir, (void *)&cdc);
1076 if (retval) {
1077 com_err(disk, retval, "while converting directory #%ld\n", (long)ino);
1078 exit(X_ABORT);
1079 }
1080 /* Fix the last entry */
1081 if ((cdc.offset % cdc.bs) != 0) {
1082 de = (struct ext2_dir_entry *)(cdc.buf + cdc.prev_offset);
1083 de->rec_len += cdc.bs - (cdc.offset % cdc.bs);
1084 cdc.offset += cdc.bs - (cdc.offset % cdc.bs);
1085 }
1086
1087 dir_size = cdc.offset;
1088
1089 #ifdef __linux__
1090 memset(&nbi, 0, sizeof(nbi));
1091 nbi.di_mode = dp->di_mode;
1092 nbi.di_nlink = dp->di_nlink;
1093 nbi.di_ouid = dp->di_uid;
1094 nbi.di_ogid = dp->di_gid;
1095 nbi.di_size = dir_size; /* (u_quad_t)dp->di_size; */
1096 nbi.di_atime.tv_sec = dp->di_atime;
1097 nbi.di_mtime.tv_sec = dp->di_mtime;
1098 nbi.di_ctime.tv_sec = dp->di_ctime;
1099 memmove(&nbi.di_db, &dp->di_db, (NDADDR + NIADDR) * sizeof(daddr_t));
1100 nbi.di_flags = dp->di_flags;
1101 nbi.di_blocks = dp->di_blocks;
1102 nbi.di_gen = dp->di_gen;
1103 nbi.di_uid = (((int32_t)dp->di_uidhigh) << 16) | dp->di_uid;
1104 nbi.di_gid = (((int32_t)dp->di_gidhigh) << 16) | dp->di_gid;
1105 if (dp->di_file_acl)
1106 msg("ACLs in inode #%ld won't be dumped\n", (long)ino);
1107 memmove(&spcl.c_dinode, &nbi, sizeof(nbi));
1108 #else /* __linux__ */
1109 spcl.c_dinode = *dp;
1110 #endif /* __linux__ */
1111 spcl.c_type = TS_INODE;
1112 spcl.c_count = 0;
1113 switch (dp->di_mode & S_IFMT) {
1114
1115 case 0:
1116 /*
1117 * Freed inode.
1118 */
1119 return;
1120
1121 case S_IFDIR:
1122 if (dir_size > 0)
1123 break;
1124 msg("Warning: size of directory inode #%d is <= 0 (%d)!\n",
1125 ino, dir_size);
1126 return;
1127
1128 default:
1129 msg("Warning: dumpdirino called with file type 0%o (inode #%d)\n",
1130 dp->di_mode & IFMT, ino);
1131 return;
1132 }
1133 for (size = 0; size < dir_size; size += TP_BSIZE) {
1134 spcl.c_addr[0] = 1;
1135 spcl.c_count = 1;
1136 writeheader(ino);
1137 memmove(buf, cdc.buf + size, TP_BSIZE);
1138 writerec(buf, 0);
1139 spcl.c_type = TS_ADDR;
1140 }
1141
1142 (void)free(cdc.buf);
1143 }
1144 #endif /* __linux__ */
1145
1146 #ifndef __linux__
1147 /*
1148 * Read indirect blocks, and pass the data blocks to be dumped.
1149 */
1150 static void
1151 dmpindir(dump_ino_t ino, daddr_t blk, int ind_level, fsizeT *size)
1152 {
1153 int i, cnt;
1154 #ifdef __linux__
1155 int max;
1156 blk_t *swapme;
1157 #endif
1158 daddr_t idblk[MAXNINDIR];
1159
1160 if (blk != 0) {
1161 bread(fsbtodb(sblock, blk), (char *)idblk, (int) sblock->fs_bsize);
1162 #ifdef __linux__
1163 /*
1164 * My RedHat 4.0 system doesn't have these flags; I haven't
1165 * upgraded e2fsprogs yet
1166 */
1167 #if defined(EXT2_FLAG_SWAP_BYTES)
1168 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
1169 (fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
1170 #endif
1171 {
1172 max = sblock->fs_bsize >> 2;
1173 swapme = (blk_t *) idblk;
1174 for (i = 0; i < max; i++, swapme++)
1175 *swapme = ext2fs_swab32(*swapme);
1176 }
1177 #endif /* __linux__ */
1178 else
1179 memset(idblk, 0, (int)sblock->fs_bsize);
1180 if (ind_level <= 0) {
1181 if (*size < NINDIR(sblock) * sblock->fs_bsize)
1182 cnt = howmany(*size, sblock->fs_fsize);
1183 else
1184 #ifdef __linux__
1185 cnt = NINDIR(sblock) * EXT2_FRAGS_PER_BLOCK(fs->super);
1186 #else
1187 cnt = NINDIR(sblock) * sblock->fs_frag;
1188 #endif
1189 *size -= NINDIR(sblock) * sblock->fs_bsize;
1190 blksout(&idblk[0], cnt, ino);
1191 return;
1192 }
1193 ind_level--;
1194 for (i = 0; i < NINDIR(sblock); i++) {
1195 dmpindir(ino, idblk[i], ind_level, size);
1196 if (*size <= 0)
1197 return;
1198 }
1199 }
1200 #endif
1201
1202 /*
1203 * Collect up the data into tape record sized buffers and output them.
1204 */
1205 void
1206 blksout(blk_t *blkp, int frags, dump_ino_t ino)
1207 {
1208 blk_t *bp;
1209 int i, j, count, blks, tbperdb;
1210
1211 blks = howmany(frags * sblock->fs_fsize, TP_BSIZE);
1212 tbperdb = sblock->fs_bsize >> tp_bshift;
1213 for (i = 0; i < blks; i += TP_NINDIR) {
1214 if (i + TP_NINDIR > blks)
1215 count = blks;
1216 else
1217 count = i + TP_NINDIR;
1218 for (j = i; j < count; j++)
1219 if (blkp[j / tbperdb] != 0)
1220 spcl.c_addr[j - i] = 1;
1221 else
1222 spcl.c_addr[j - i] = 0;
1223 spcl.c_count = count - i;
1224 writeheader(ino);
1225 bp = &blkp[i / tbperdb];
1226 for (j = i; j < count; j += tbperdb, bp++) {
1227 if (*bp != 0) {
1228 if (j + tbperdb <= count)
1229 dumpblock(*bp, (int)sblock->fs_bsize);
1230 else
1231 dumpblock(*bp, (count - j) * TP_BSIZE);
1232 }
1233 }
1234 spcl.c_type = TS_ADDR;
1235 }
1236 }
1237
1238 /*
1239 * Dump a map to the tape.
1240 */
1241 void
1242 dumpmap(char *map, int type, dump_ino_t ino)
1243 {
1244 int i;
1245 char *cp;
1246
1247 spcl.c_type = type;
1248 spcl.c_count = howmany(mapsize * sizeof(char), TP_BSIZE);
1249 writeheader(ino);
1250 for (i = 0, cp = map; i < spcl.c_count; i++, cp += TP_BSIZE)
1251 writerec(cp, 0);
1252 }
1253
1254 #if defined(__linux__) && !defined(int32_t)
1255 #define int32_t __s32
1256 #endif
1257
1258 /*
1259 * Compute and fill in checksum information.
1260 */
1261 void
1262 mkchecksum(union u_spcl *tmpspcl)
1263 {
1264 int32_t sum, cnt, *lp;
1265
1266 tmpspcl->s_spcl.c_checksum = 0;
1267 lp = (int32_t *)&tmpspcl->s_spcl;
1268 sum = 0;
1269 cnt = sizeof(union u_spcl) / (4 * sizeof(int32_t));
1270 while (--cnt >= 0) {
1271 sum += *lp++;
1272 sum += *lp++;
1273 sum += *lp++;
1274 sum += *lp++;
1275 }
1276 tmpspcl->s_spcl.c_checksum = CHECKSUM - sum;
1277 }
1278
1279 /*
1280 * Write a header record to the dump tape.
1281 */
1282 void
1283 writeheader(dump_ino_t ino)
1284 {
1285 spcl.c_inumber = ino;
1286 spcl.c_magic = NFS_MAGIC;
1287 mkchecksum((union u_spcl *)&spcl);
1288 writerec((char *)&spcl, 1);
1289 }
1290
1291 #ifdef __linux__
1292 struct dinode *
1293 getino(dump_ino_t inum)
1294 {
1295 static struct dinode dinode;
1296 errcode_t err;
1297
1298 curino = inum;
1299 err = ext2fs_read_inode(fs, (ext2_ino_t)inum, (struct ext2_inode *) &dinode);
1300 if (err) {
1301 com_err(disk, err, "while reading inode #%ld\n", (long)inum);
1302 exit(X_ABORT);
1303 }
1304 return &dinode;
1305 }
1306 #else /* __linux__ */
1307 struct dinode *
1308 getino(dump_ino_t inum)
1309 {
1310 static daddr_t minino, maxino;
1311 static struct dinode inoblock[MAXINOPB];
1312
1313 curino = inum;
1314 if (inum >= minino && inum < maxino)
1315 return (&inoblock[inum - minino]);
1316 bread(fsbtodb(sblock, ino_to_fsba(sblock, inum)), (char *)inoblock,
1317 (int)sblock->fs_bsize);
1318 minino = inum - (inum % INOPB(sblock));
1319 maxino = minino + INOPB(sblock);
1320 return (&inoblock[inum - minino]);
1321 }
1322 #endif /* __linux__ */
1323
1324 /*
1325 * Read a chunk of data from the disk.
1326 * Try to recover from hard errors by reading in sector sized pieces.
1327 * Error recovery is attempted at most BREADEMAX times before seeking
1328 * consent from the operator to continue.
1329 */
1330 int breaderrors = 0;
1331
1332 void
1333 bread(ext2_loff_t blkno, char *buf, int size)
1334 {
1335 int cnt, i;
1336
1337 loop:
1338 #ifdef __linux__
1339 if (ext2fs_llseek(diskfd, (blkno << dev_bshift), 0) !=
1340 (blkno << dev_bshift))
1341 #else
1342 if (lseek(diskfd, ((off_t)blkno << dev_bshift), 0) !=
1343 ((off_t)blkno << dev_bshift))
1344 #endif
1345 msg("bread: lseek fails\n");
1346 if ((cnt = read(diskfd, buf, size)) == size)
1347 return;
1348 if (blkno + (size / dev_bsize) > fsbtodb(sblock, sblock->fs_size)) {
1349 /*
1350 * Trying to read the final fragment.
1351 *
1352 * NB - dump only works in TP_BSIZE blocks, hence
1353 * rounds `dev_bsize' fragments up to TP_BSIZE pieces.
1354 * It should be smarter about not actually trying to
1355 * read more than it can get, but for the time being
1356 * we punt and scale back the read only when it gets
1357 * us into trouble. (mkm 9/25/83)
1358 */
1359 size -= dev_bsize;
1360 goto loop;
1361 }
1362 if (cnt == -1)
1363 msg("read error from %s: %s: [block %d, ext2blk %d]: count=%d\n",
1364 disk, strerror(errno), blkno,
1365 dbtofsb(sblock, blkno), size);
1366 else
1367 msg("short read error from %s: [block %d, ext2blk %d]: count=%d, got=%d\n",
1368 disk, blkno, dbtofsb(sblock, blkno), size, cnt);
1369 if (breademax && ++breaderrors > breademax) {
1370 msg("More than %d block read errors from %d\n",
1371 breademax, disk);
1372 broadcast("DUMP IS AILING!\n");
1373 msg("This is an unrecoverable error.\n");
1374 if (!query("Do you want to attempt to continue?")){
1375 dumpabort(0);
1376 /*NOTREACHED*/
1377 } else
1378 breaderrors = 0;
1379 }
1380 /*
1381 * Zero buffer, then try to read each sector of buffer separately.
1382 */
1383 memset(buf, 0, size);
1384 for (i = 0; i < size; i += dev_bsize, buf += dev_bsize, blkno++) {
1385 #ifdef __linux__
1386 if (ext2fs_llseek(diskfd, (blkno << dev_bshift), 0) !=
1387 (blkno << dev_bshift))
1388 #else
1389 if (lseek(diskfd, ((off_t)blkno << dev_bshift), 0) !=
1390 ((off_t)blkno << dev_bshift))
1391 #endif
1392 msg("bread: lseek2 fails!\n");
1393 if ((cnt = read(diskfd, buf, (int)dev_bsize)) == dev_bsize)
1394 continue;
1395 if (cnt == -1) {
1396 msg("read error from %s: %s: [sector %d, ext2blk %d]: count=%d\n",
1397 disk, strerror(errno), blkno,
1398 dbtofsb(sblock, blkno), dev_bsize);
1399 continue;
1400 }
1401 msg("short read error from %s: [sector %d, ext2blk %d]: count=%d, got=%d\n",
1402 disk, blkno, dbtofsb(sblock, blkno), dev_bsize, cnt);
1403 }
1404 }
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