GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: sbin/fsck_ext2fs/setup.c Lines: 0 274 0.0 %
Date: 2017-11-13 Branches: 0 148 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: setup.c,v 1.31 2017/08/26 06:32:06 otto Exp $	*/
2
/*	$NetBSD: setup.c,v 1.1 1997/06/11 11:22:01 bouyer Exp $	*/
3
4
/*
5
 * Copyright (c) 1997 Manuel Bouyer.
6
 * Copyright (c) 1980, 1986, 1993
7
 *	The Regents of the University of California.  All rights reserved.
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. Neither the name of the University nor the names of its contributors
18
 *    may be used to endorse or promote products derived from this software
19
 *    without specific prior written permission.
20
 *
21
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31
 * SUCH DAMAGE.
32
 */
33
34
#define DKTYPENAMES
35
#include <sys/param.h>	/* DEV_BSIZE roundup */
36
#include <sys/time.h>
37
#include <ufs/ext2fs/ext2fs_dinode.h>
38
#include <ufs/ext2fs/ext2fs.h>
39
#include <sys/stat.h>
40
#include <sys/ioctl.h>
41
#include <sys/dkio.h>
42
#include <sys/disklabel.h>
43
44
#include <errno.h>
45
#include <fcntl.h>
46
#include <stdio.h>
47
#include <stdlib.h>
48
#include <unistd.h>
49
#include <string.h>
50
#include <ctype.h>
51
#include <err.h>
52
53
#include "fsck.h"
54
#include "extern.h"
55
#include "fsutil.h"
56
57
#define POWEROF2(num)	(((num) & ((num) - 1)) == 0)
58
59
void badsb(int, char *);
60
int calcsb(char *, int, struct m_ext2fs *, struct disklabel *);
61
static struct disklabel *getdisklabel(char *, int);
62
static int readsb(int);
63
64
int
65
setup(char *dev)
66
{
67
	long cg, asked, i;
68
	long bmapsize;
69
	struct disklabel *lp;
70
	off_t sizepb;
71
	struct stat statb;
72
	struct m_ext2fs proto;
73
	int doskipclean;
74
	u_int64_t maxfilesize;
75
76
	havesb = 0;
77
	fswritefd = -1;
78
	doskipclean = skipclean;
79
	if (stat(dev, &statb) < 0) {
80
		printf("Can't stat %s: %s\n", dev, strerror(errno));
81
		return (0);
82
	}
83
	if (!S_ISCHR(statb.st_mode)) {
84
		pfatal("%s is not a character device", dev);
85
		if (reply("CONTINUE") == 0)
86
			return (0);
87
	}
88
	if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
89
		printf("Can't open %s: %s\n", dev, strerror(errno));
90
		return (0);
91
	}
92
	if (preen == 0)
93
		printf("** %s", dev);
94
	if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
95
		fswritefd = -1;
96
		if (preen)
97
			pfatal("NO WRITE ACCESS");
98
		printf(" (NO WRITE)");
99
	}
100
	if (preen == 0)
101
		printf("\n");
102
	fsmodified = 0;
103
	lfdir = 0;
104
	initbarea(&sblk);
105
	initbarea(&asblk);
106
	sblk.b_un.b_buf = malloc(SBSIZE);
107
	asblk.b_un.b_buf = malloc(SBSIZE);
108
	if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
109
		errexit("cannot allocate space for superblock\n");
110
	if ((lp = getdisklabel(NULL, fsreadfd)) != NULL)
111
		secsize = lp->d_secsize;
112
	else
113
		secsize = DEV_BSIZE;
114
115
	if (!hotroot()) {
116
#ifndef SMALL
117
		if (pledge("stdio getpw flock rpath cpath wpath", NULL) == -1)
118
			err(1, "pledge");
119
#else
120
		if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
121
			err(1, "pledge");
122
#endif
123
	}
124
125
	/*
126
	 * Read in the superblock, looking for alternates if necessary
127
	 */
128
	if (readsb(1) == 0) {
129
		if (bflag || preen || calcsb(dev, fsreadfd, &proto, lp) == 0)
130
			return(0);
131
		if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
132
			return (0);
133
		for (cg = 1; cg < proto.e2fs_ncg; cg++) {
134
			bflag = fsbtodb(&proto,
135
				cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock);
136
			if (readsb(0) != 0)
137
				break;
138
		}
139
		if (cg >= proto.e2fs_ncg) {
140
			printf("%s %s\n%s %s\n%s %s\n",
141
			    "SEARCH FOR ALTERNATE SUPER-BLOCK",
142
			    "FAILED. YOU MUST USE THE",
143
			    "-b OPTION TO FSCK_FFS TO SPECIFY THE",
144
			    "LOCATION OF AN ALTERNATE",
145
			    "SUPER-BLOCK TO SUPPLY NEEDED",
146
			    "INFORMATION; SEE fsck_ext2fs(8).");
147
			return(0);
148
		}
149
		doskipclean = 0;
150
		pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
151
	}
152
	if (debug)
153
		printf("state = %d\n", sblock.e2fs.e2fs_state);
154
	if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) {
155
		if (doskipclean) {
156
			pwarn("%sile system is clean; not checking\n",
157
			    preen ? "f" : "** F");
158
			return (-1);
159
		}
160
		if (!preen)
161
			pwarn("** File system is already clean\n");
162
	}
163
	maxfsblock = sblock.e2fs.e2fs_bcount;
164
	maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg;
165
	sizepb = sblock.e2fs_bsize;
166
	maxfilesize = sblock.e2fs_bsize * NDADDR - 1;
167
	for (i = 0; i < NIADDR; i++) {
168
		sizepb *= NINDIR(&sblock);
169
		maxfilesize += sizepb;
170
	}
171
	/*
172
	 * Check and potentially fix certain fields in the super block.
173
	 */
174
	if (/* (sblock.e2fs.e2fs_rbcount < 0) || */
175
			(sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) {
176
		pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK",
177
			sblock.e2fs.e2fs_rbcount);
178
		if (reply("SET TO DEFAULT") == 1) {
179
			sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1;
180
			sbdirty();
181
			dirty(&asblk);
182
		}
183
	}
184
	if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) {
185
		pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK",
186
			sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg);
187
		return 0;
188
	}
189
	if (asblk.b_dirty && !bflag) {
190
		copyback_sb(&asblk);
191
		flush(fswritefd, &asblk);
192
	}
193
	/*
194
	 * read in the summary info.
195
	 */
196
197
	sblock.e2fs_gd = calloc(sblock.e2fs_ngdb, sblock.e2fs_bsize);
198
	if (sblock.e2fs_gd == NULL)
199
		errexit("out of memory\n");
200
	asked = 0;
201
	for (i=0; i < sblock.e2fs_ngdb; i++) {
202
		if (bread(fsreadfd,(char *)
203
			&sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)],
204
			fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1),
205
			sblock.e2fs_bsize) != 0 && !asked) {
206
			pfatal("BAD SUMMARY INFORMATION");
207
			if (reply("CONTINUE") == 0)
208
				errexit("%s\n", "");
209
			asked++;
210
		}
211
	}
212
	/*
213
	 * allocate and initialize the necessary maps
214
	 */
215
	bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t));
216
	blockmap = calloc((unsigned)bmapsize, sizeof (char));
217
	if (blockmap == NULL) {
218
		printf("cannot alloc %u bytes for blockmap\n",
219
			(unsigned)bmapsize);
220
		goto badsblabel;
221
	}
222
	statemap = calloc((unsigned)(maxino + 2), sizeof(char));
223
	if (statemap == NULL) {
224
		printf("cannot alloc %u bytes for statemap\n",
225
			(unsigned)(maxino + 1));
226
		goto badsblabel;
227
	}
228
	typemap = calloc((unsigned)(maxino + 1), sizeof(u_char));
229
	if (typemap == NULL) {
230
		printf("cannot alloc %u bytes for typemap\n",
231
		    (unsigned)(maxino + 1));
232
		goto badsblabel;
233
	}
234
	lncntp = calloc((unsigned)(maxino + 1), sizeof(int16_t));
235
	if (lncntp == NULL) {
236
		printf("cannot alloc %u bytes for lncntp\n",
237
			(unsigned)((maxino + 1) * sizeof(int16_t)));
238
		goto badsblabel;
239
	}
240
	for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) {
241
		numdirs += letoh16(sblock.e2fs_gd[cg].ext2bgd_ndirs);
242
	}
243
	inplast = 0;
244
	listmax = numdirs + 10;
245
	inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
246
	inphead = calloc((unsigned)numdirs, sizeof(struct inoinfo *));
247
	if (inpsort == NULL || inphead == NULL) {
248
		printf("cannot alloc %u bytes for inphead\n",
249
			(unsigned)(numdirs * sizeof(struct inoinfo *)));
250
		goto badsblabel;
251
	}
252
	bufinit();
253
	return (1);
254
255
badsblabel:
256
	ckfini(0);
257
	return (0);
258
}
259
260
/*
261
 * Read in the super block and its summary info.
262
 */
263
static int
264
readsb(int listerr)
265
{
266
	daddr32_t super = bflag ? bflag : SBOFF / DEV_BSIZE;
267
268
	if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0)
269
		return (0);
270
	sblk.b_bno = super;
271
	sblk.b_size = SBSIZE;
272
273
	/* Copy the superblock in memory */
274
	e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs);
275
276
	/*
277
	 * run a few consistency checks of the super block
278
	 */
279
	if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) {
280
		badsb(listerr, "MAGIC NUMBER WRONG"); return (0);
281
	}
282
	if (sblock.e2fs.e2fs_log_bsize > 2) {
283
		badsb(listerr, "BAD LOG_BSIZE"); return (0);
284
	}
285
	if (sblock.e2fs.e2fs_bpg == 0) {
286
		badsb(listerr, "BAD BLOCKS PER GROUP"); return (0);
287
	}
288
289
	/* compute the dynamic fields of the in-memory sb */
290
	/* compute dynamic sb infos */
291
	sblock.e2fs_ncg =
292
		howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock,
293
		sblock.e2fs.e2fs_bpg);
294
	/* XXX assume hw bsize = 512 */
295
	sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1;
296
	sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize;
297
	sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize;
298
	sblock.e2fs_qbmask = sblock.e2fs_bsize - 1;
299
	sblock.e2fs_bmask = ~sblock.e2fs_qbmask;
300
	sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg,
301
		sblock.e2fs_bsize / sizeof(struct ext2_gd));
302
	sblock.e2fs_ipb = sblock.e2fs_bsize / EXT2_DINODE_SIZE(&sblock);
303
	sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb;
304
305
	/*
306
	 * Compute block size that the filesystem is based on,
307
	 * according to fsbtodb, and adjust superblock block number
308
	 * so we can tell if this is an alternate later.
309
	 */
310
	sblk.b_bno = super / DEV_BSIZE;
311
312
	if (sblock.e2fs_ncg == 1) {
313
		/* no alternate superblock; assume it's okey */
314
		havesb = 1;
315
		return 1;
316
	}
317
318
	getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock,
319
		(long)SBSIZE);
320
	if (asblk.b_errs)
321
		return (0);
322
	if (bflag) {
323
		havesb = 1;
324
		return (1);
325
	}
326
327
	/*
328
	 * Set all possible fields that could differ, then do check
329
	 * of whole super block against an alternate super block.
330
	 * When an alternate super-block is specified this check is skipped.
331
	 */
332
	asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount;
333
	asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount;
334
	asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount;
335
	asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime;
336
	asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime;
337
	asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count;
338
	asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count;
339
	asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state;
340
	asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh;
341
	asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck;
342
	asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv;
343
	asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid;
344
	asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid;
345
	asblk.b_un.b_fs->e2fs_block_group_nr =
346
	    sblk.b_un.b_fs->e2fs_block_group_nr;
347
	asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGEFILE;
348
	asblk.b_un.b_fs->e2fs_features_rocompat |=
349
	    sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE;
350
	if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
351
	    ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) ||
352
	    (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) {
353
		if (debug) {
354
			printf("compat 0x%08x, incompat 0x%08x, compat_ro "
355
			    "0x%08x\n",
356
			    sblock.e2fs.e2fs_features_compat,
357
			    sblock.e2fs.e2fs_features_incompat,
358
			    sblock.e2fs.e2fs_features_rocompat);
359
		}
360
		badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK");
361
		return 0;
362
	}
363
	if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) {
364
		if (debug) {
365
			u_int32_t *nlp, *olp, *endlp;
366
367
			printf("superblock mismatches\n");
368
			nlp = (u_int32_t *)asblk.b_un.b_fs;
369
			olp = (u_int32_t *)sblk.b_un.b_fs;
370
			endlp = olp + (SBSIZE / sizeof *olp);
371
			for ( ; olp < endlp; olp++, nlp++) {
372
				if (*olp == *nlp)
373
					continue;
374
				printf("offset %ld, original %ld, alternate %ld\n",
375
					(long)(olp - (u_int32_t *)sblk.b_un.b_fs),
376
					(long)letoh32(*olp),
377
					(long)letoh32(*nlp));
378
			}
379
		}
380
		badsb(listerr,
381
		"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
382
		return (0);
383
	}
384
	havesb = 1;
385
	return (1);
386
}
387
388
void
389
copyback_sb(struct bufarea *bp)
390
{
391
	/* Copy the in-memory superblock back to buffer */
392
	bp->b_un.b_fs->e2fs_icount = letoh32(sblock.e2fs.e2fs_icount);
393
	bp->b_un.b_fs->e2fs_bcount = letoh32(sblock.e2fs.e2fs_bcount);
394
	bp->b_un.b_fs->e2fs_rbcount = letoh32(sblock.e2fs.e2fs_rbcount);
395
	bp->b_un.b_fs->e2fs_fbcount = letoh32(sblock.e2fs.e2fs_fbcount);
396
	bp->b_un.b_fs->e2fs_ficount = letoh32(sblock.e2fs.e2fs_ficount);
397
	bp->b_un.b_fs->e2fs_first_dblock =
398
					letoh32(sblock.e2fs.e2fs_first_dblock);
399
	bp->b_un.b_fs->e2fs_log_bsize = letoh32(sblock.e2fs.e2fs_log_bsize);
400
	bp->b_un.b_fs->e2fs_log_fsize = letoh32(sblock.e2fs.e2fs_log_fsize);
401
	bp->b_un.b_fs->e2fs_bpg = letoh32(sblock.e2fs.e2fs_bpg);
402
	bp->b_un.b_fs->e2fs_fpg = letoh32(sblock.e2fs.e2fs_fpg);
403
	bp->b_un.b_fs->e2fs_ipg = letoh32(sblock.e2fs.e2fs_ipg);
404
	bp->b_un.b_fs->e2fs_mtime = letoh32(sblock.e2fs.e2fs_mtime);
405
	bp->b_un.b_fs->e2fs_wtime = letoh32(sblock.e2fs.e2fs_wtime);
406
	bp->b_un.b_fs->e2fs_lastfsck = letoh32(sblock.e2fs.e2fs_lastfsck);
407
	bp->b_un.b_fs->e2fs_fsckintv = letoh32(sblock.e2fs.e2fs_fsckintv);
408
	bp->b_un.b_fs->e2fs_creator = letoh32(sblock.e2fs.e2fs_creator);
409
	bp->b_un.b_fs->e2fs_rev = letoh32(sblock.e2fs.e2fs_rev);
410
	bp->b_un.b_fs->e2fs_mnt_count = letoh16(sblock.e2fs.e2fs_mnt_count);
411
	bp->b_un.b_fs->e2fs_max_mnt_count =
412
					letoh16(sblock.e2fs.e2fs_max_mnt_count);
413
	bp->b_un.b_fs->e2fs_magic = letoh16(sblock.e2fs.e2fs_magic);
414
	bp->b_un.b_fs->e2fs_state = letoh16(sblock.e2fs.e2fs_state);
415
	bp->b_un.b_fs->e2fs_beh = letoh16(sblock.e2fs.e2fs_beh);
416
	bp->b_un.b_fs->e2fs_ruid = letoh16(sblock.e2fs.e2fs_ruid);
417
	bp->b_un.b_fs->e2fs_rgid = letoh16(sblock.e2fs.e2fs_rgid);
418
}
419
420
void
421
badsb(int listerr, char *s)
422
{
423
424
	if (!listerr)
425
		return;
426
	if (preen)
427
		printf("%s: ", cdevname());
428
	pfatal("BAD SUPER BLOCK: %s\n", s);
429
}
430
431
/*
432
 * Calculate a prototype superblock based on information in the disk label.
433
 * When done the cgsblock macro can be calculated and the fs_ncg field
434
 * can be used. Do NOT attempt to use other macros without verifying that
435
 * their needed information is available!
436
 */
437
int
438
calcsb(char *dev, int devfd, struct m_ext2fs *fs, struct disklabel *lp)
439
{
440
	struct partition *pp;
441
	char *cp;
442
443
	cp = strchr(dev, '\0');
444
	if ((cp == NULL || (cp[-1] < 'a' || cp[-1] >= 'a' + MAXPARTITIONS)) &&
445
	    !isdigit((unsigned char)cp[-1])) {
446
		pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
447
		return (0);
448
	}
449
	cp--;
450
	if (lp == NULL)
451
		pfatal("%s: CANNOT READ DISKLABEL\n", dev);
452
	if (isdigit((unsigned char)*cp))
453
		pp = &lp->d_partitions[0];
454
	else
455
		pp = &lp->d_partitions[*cp - 'a'];
456
	if (pp->p_fstype != FS_EXT2FS) {
457
		pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n",
458
			dev, pp->p_fstype < FSMAXTYPES ?
459
			fstypenames[pp->p_fstype] : "unknown");
460
		return (0);
461
	}
462
	memset(fs, 0, sizeof(struct m_ext2fs));
463
	fs->e2fs_bsize = DISKLABELV1_FFS_FSIZE(pp->p_fragblock); /* XXX */
464
	if (fs->e2fs_bsize == 0) {
465
		pfatal("%s: BLOCK SIZE DETERMINED TO BE ZERO\n", dev);
466
		return (0);
467
	}
468
	fs->e2fs.e2fs_log_bsize = fs->e2fs_bsize / 1024;
469
	fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize;
470
	fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0;
471
	fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY;
472
	fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize;
473
	fs->e2fs_qbmask = fs->e2fs_bsize - 1;
474
	fs->e2fs_bmask = ~fs->e2fs_qbmask;
475
	fs->e2fs_ncg =
476
		howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock,
477
		fs->e2fs.e2fs_bpg);
478
	fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1;
479
	fs->e2fs_ngdb = howmany(fs->e2fs_ncg,
480
		fs->e2fs_bsize / sizeof(struct ext2_gd));
481
482
	return (1);
483
}
484
485
static struct disklabel *
486
getdisklabel(char *s, int fd)
487
{
488
	static struct disklabel lab;
489
490
	if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
491
		if (s == NULL)
492
			return (NULL);
493
		pwarn("ioctl (GCINFO): %s\n", strerror(errno));
494
		errexit("%s: can't read disk label\n", s);
495
	}
496
	return (&lab);
497
}
498
499
daddr32_t
500
cgoverhead(int c)
501
{
502
	int overh;
503
	overh =	1 /* block bitmap */ +
504
		1 /* inode bitmap */ +
505
		sblock.e2fs_itpg;
506
	if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
507
	    sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
508
		if (cg_has_sb(c) == 0)
509
			return overh;
510
	}
511
	overh += 1 + sblock.e2fs_ngdb;
512
	return overh;
513
}