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1  /*
2   * util.c --- miscellaneous utilities
3   *
4   * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
5   *
6   * %Begin-Header%
7   * This file may be redistributed under the terms of the GNU Public
8   * License.
9   * %End-Header%
10   */
11  
12  #include "config.h"
13  #include <stdlib.h>
14  #include <stdio.h>
15  #include <unistd.h>
16  #include <string.h>
17  #include <ctype.h>
18  #ifdef __linux__
19  #include <sys/utsname.h>
20  #endif
21  
22  #ifdef HAVE_CONIO_H
23  #undef HAVE_TERMIOS_H
24  #include <conio.h>
25  #define read_a_char()	getch()
26  #else
27  #ifdef HAVE_TERMIOS_H
28  #include <termios.h>
29  #endif
30  #endif
31  
32  #ifdef HAVE_MALLOC_H
33  #include <malloc.h>
34  #endif
35  
36  #ifdef HAVE_ERRNO_H
37  #include <errno.h>
38  #endif
39  
40  #ifdef HAVE_SYS_SYSCTL_H
41  #include <sys/sysctl.h>
42  #endif
43  
44  #include "e2fsck.h"
45  
46  extern e2fsck_t e2fsck_global_ctx;   /* Try your very best not to use this! */
47  
48  #include <stdarg.h>
49  #include <time.h>
50  #include <sys/time.h>
51  #include <sys/resource.h>
52  
fatal_error(e2fsck_t ctx,const char * msg)53  void fatal_error(e2fsck_t ctx, const char *msg)
54  {
55  	ext2_filsys fs = ctx->fs;
56  	int exit_value = FSCK_ERROR;
57  
58  	if (msg)
59  		fprintf (stderr, "e2fsck: %s\n", msg);
60  	if (!fs)
61  		goto out;
62  	if (fs->io && fs->super) {
63  		ext2fs_mmp_stop(ctx->fs);
64  		if (ctx->fs->io->magic == EXT2_ET_MAGIC_IO_CHANNEL)
65  			io_channel_flush(ctx->fs->io);
66  		else
67  			log_err(ctx, "e2fsck: io manager magic bad!\n");
68  	}
69  	if (ext2fs_test_changed(fs)) {
70  		exit_value |= FSCK_NONDESTRUCT;
71  		log_out(ctx, _("\n%s: ***** FILE SYSTEM WAS MODIFIED *****\n"),
72  			ctx->device_name);
73  		if (ctx->mount_flags & EXT2_MF_ISROOT)
74  			exit_value |= FSCK_REBOOT;
75  	}
76  	if (!ext2fs_test_valid(fs)) {
77  		log_out(ctx, _("\n%s: ********** WARNING: Filesystem still has "
78  			       "errors **********\n\n"), ctx->device_name);
79  		exit_value |= FSCK_UNCORRECTED;
80  		exit_value &= ~FSCK_NONDESTRUCT;
81  	}
82  out:
83  	ctx->flags |= E2F_FLAG_ABORT;
84  	if (ctx->flags & E2F_FLAG_SETJMP_OK)
85  		longjmp(ctx->abort_loc, 1);
86  	exit(exit_value);
87  }
88  
log_out(e2fsck_t ctx,const char * fmt,...)89  void log_out(e2fsck_t ctx, const char *fmt, ...)
90  {
91  	va_list pvar;
92  
93  	va_start(pvar, fmt);
94  	vprintf(fmt, pvar);
95  	va_end(pvar);
96  	if (ctx->logf) {
97  		va_start(pvar, fmt);
98  		vfprintf(ctx->logf, fmt, pvar);
99  		va_end(pvar);
100  	}
101  }
102  
log_err(e2fsck_t ctx,const char * fmt,...)103  void log_err(e2fsck_t ctx, const char *fmt, ...)
104  {
105  	va_list pvar;
106  
107  	va_start(pvar, fmt);
108  	vfprintf(stderr, fmt, pvar);
109  	va_end(pvar);
110  	if (ctx->logf) {
111  		va_start(pvar, fmt);
112  		vfprintf(ctx->logf, fmt, pvar);
113  		va_end(pvar);
114  	}
115  }
116  
e2fsck_allocate_memory(e2fsck_t ctx,unsigned int size,const char * description)117  void *e2fsck_allocate_memory(e2fsck_t ctx, unsigned int size,
118  			     const char *description)
119  {
120  	void *ret;
121  	char buf[256];
122  
123  #ifdef DEBUG_ALLOCATE_MEMORY
124  	printf("Allocating %u bytes for %s...\n", size, description);
125  #endif
126  	ret = malloc(size);
127  	if (!ret) {
128  		sprintf(buf, "Can't allocate %u bytes for %s\n",
129  			size, description);
130  		fatal_error(ctx, buf);
131  	}
132  	memset(ret, 0, size);
133  	return ret;
134  }
135  
string_copy(e2fsck_t ctx EXT2FS_ATTR ((unused)),const char * str,int len)136  char *string_copy(e2fsck_t ctx EXT2FS_ATTR((unused)),
137  		  const char *str, int len)
138  {
139  	char	*ret;
140  
141  	if (!str)
142  		return NULL;
143  	if (!len)
144  		len = strlen(str);
145  	ret = malloc(len+1);
146  	if (ret) {
147  		strncpy(ret, str, len);
148  		ret[len] = 0;
149  	}
150  	return ret;
151  }
152  
153  #ifndef HAVE_STRNLEN
154  /*
155   * Incredibly, libc5 doesn't appear to have strnlen.  So we have to
156   * provide our own.
157   */
e2fsck_strnlen(const char * s,int count)158  int e2fsck_strnlen(const char * s, int count)
159  {
160  	const char *cp = s;
161  
162  	while (count-- && *cp)
163  		cp++;
164  	return cp - s;
165  }
166  #endif
167  
168  #ifndef HAVE_CONIO_H
read_a_char(void)169  static int read_a_char(void)
170  {
171  	char	c;
172  	int	r;
173  	int	fail = 0;
174  
175  	while(1) {
176  		if (e2fsck_global_ctx &&
177  		    (e2fsck_global_ctx->flags & E2F_FLAG_CANCEL)) {
178  			return 3;
179  		}
180  		r = read(0, &c, 1);
181  		if (r == 1)
182  			return c;
183  		if (fail++ > 100)
184  			break;
185  	}
186  	return EOF;
187  }
188  #endif
189  
ask_yn(e2fsck_t ctx,const char * string,int def)190  int ask_yn(e2fsck_t ctx, const char * string, int def)
191  {
192  	int		c;
193  	const char	*defstr;
194  	const char	*short_yes = _("yY");
195  	const char	*short_no = _("nN");
196  	const char	*short_yesall = _("aA");
197  	const char	*yesall_prompt = _(" ('a' enables 'yes' to all) ");
198  	const char	*extra_prompt = "";
199  	static int	yes_answers;
200  
201  #ifdef HAVE_TERMIOS_H
202  	struct termios	termios, tmp;
203  
204  	tcgetattr (0, &termios);
205  	tmp = termios;
206  	tmp.c_lflag &= ~(ICANON | ECHO);
207  	tmp.c_cc[VMIN] = 1;
208  	tmp.c_cc[VTIME] = 0;
209  	tcsetattr (0, TCSANOW, &tmp);
210  #endif
211  
212  	if (def == 1)
213  		defstr = _(_("<y>"));
214  	else if (def == 0)
215  		defstr = _(_("<n>"));
216  	else
217  		defstr = _(" (y/n)");
218  	/*
219  	 * If the user presses 'y' more than 8 (but less than 12) times in
220  	 * succession without pressing anything else, display a hint about
221  	 * yes-to-all mode.
222  	 */
223  	if (yes_answers > 12)
224  		yes_answers = -1;
225  	else if (yes_answers > 8)
226  		extra_prompt = yesall_prompt;
227  	log_out(ctx, "%s%s%s? ", string, extra_prompt, defstr);
228  	while (1) {
229  		fflush (stdout);
230  		if ((c = read_a_char()) == EOF)
231  			break;
232  		if (c == 3) {
233  #ifdef HAVE_TERMIOS_H
234  			tcsetattr (0, TCSANOW, &termios);
235  #endif
236  			if (ctx->flags & E2F_FLAG_SETJMP_OK) {
237  				log_out(ctx, "\n");
238  				longjmp(e2fsck_global_ctx->abort_loc, 1);
239  			}
240  			log_out(ctx, "%s", _("cancelled!\n"));
241  			yes_answers = 0;
242  			return 0;
243  		}
244  		if (strchr(short_yes, (char) c)) {
245  			def = 1;
246  			if (yes_answers >= 0)
247  				yes_answers++;
248  			break;
249  		} else if (strchr(short_no, (char) c)) {
250  			def = 0;
251  			yes_answers = -1;
252  			break;
253  		} else if (strchr(short_yesall, (char)c)) {
254  			def = 2;
255  			yes_answers = -1;
256  			ctx->options |= E2F_OPT_YES;
257  			break;
258  		} else if ((c == 27 || c == ' ' || c == '\n') && (def != -1)) {
259  			yes_answers = -1;
260  			break;
261  		}
262  	}
263  	if (def == 2)
264  		log_out(ctx, "%s", _("yes to all\n"));
265  	else if (def)
266  		log_out(ctx, "%s", _("yes\n"));
267  	else
268  		log_out(ctx, "%s", _("no\n"));
269  #ifdef HAVE_TERMIOS_H
270  	tcsetattr (0, TCSANOW, &termios);
271  #endif
272  	return def;
273  }
274  
ask(e2fsck_t ctx,const char * string,int def)275  int ask (e2fsck_t ctx, const char * string, int def)
276  {
277  	if (ctx->options & E2F_OPT_NO) {
278  		log_out(ctx, _("%s? no\n\n"), string);
279  		return 0;
280  	}
281  	if (ctx->options & E2F_OPT_YES) {
282  		log_out(ctx, _("%s? yes\n\n"), string);
283  		return 1;
284  	}
285  	if (ctx->options & E2F_OPT_PREEN) {
286  		log_out(ctx, "%s? %s\n\n", string, def ? _("yes") : _("no"));
287  		return def;
288  	}
289  	return ask_yn(ctx, string, def);
290  }
291  
e2fsck_read_bitmaps(e2fsck_t ctx)292  void e2fsck_read_bitmaps(e2fsck_t ctx)
293  {
294  	ext2_filsys fs = ctx->fs;
295  	errcode_t	retval;
296  	const char	*old_op;
297  	unsigned int	save_type;
298  	int		flags;
299  
300  	if (ctx->invalid_bitmaps) {
301  		com_err(ctx->program_name, 0,
302  		    _("e2fsck_read_bitmaps: illegal bitmap block(s) for %s"),
303  			ctx->device_name);
304  		fatal_error(ctx, 0);
305  	}
306  
307  	old_op = ehandler_operation(_("reading inode and block bitmaps"));
308  	e2fsck_set_bitmap_type(fs, EXT2FS_BMAP64_RBTREE, "fs_bitmaps",
309  			       &save_type);
310  	flags = ctx->fs->flags;
311  	ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
312  	retval = ext2fs_read_bitmaps(fs);
313  	ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) |
314  			 (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS);
315  	fs->default_bitmap_type = save_type;
316  	ehandler_operation(old_op);
317  	if (retval) {
318  		com_err(ctx->program_name, retval,
319  			_("while retrying to read bitmaps for %s"),
320  			ctx->device_name);
321  		fatal_error(ctx, 0);
322  	}
323  }
324  
e2fsck_write_bitmaps(e2fsck_t ctx)325  void e2fsck_write_bitmaps(e2fsck_t ctx)
326  {
327  	ext2_filsys fs = ctx->fs;
328  	errcode_t	retval;
329  	const char	*old_op;
330  
331  	old_op = ehandler_operation(_("writing block and inode bitmaps"));
332  	retval = ext2fs_write_bitmaps(fs);
333  	ehandler_operation(old_op);
334  	if (retval) {
335  		com_err(ctx->program_name, retval,
336  			_("while rewriting block and inode bitmaps for %s"),
337  			ctx->device_name);
338  		fatal_error(ctx, 0);
339  	}
340  }
341  
preenhalt(e2fsck_t ctx)342  void preenhalt(e2fsck_t ctx)
343  {
344  	ext2_filsys fs = ctx->fs;
345  
346  	if (!(ctx->options & E2F_OPT_PREEN))
347  		return;
348  	log_err(ctx, _("\n\n%s: UNEXPECTED INCONSISTENCY; "
349  		"RUN fsck MANUALLY.\n\t(i.e., without -a or -p options)\n"),
350  	       ctx->device_name);
351  	ctx->flags |= E2F_FLAG_EXITING;
352  	if (fs != NULL) {
353  		fs->super->s_state |= EXT2_ERROR_FS;
354  		ext2fs_mark_super_dirty(fs);
355  		ext2fs_close_free(&fs);
356  	}
357  	exit(FSCK_UNCORRECTED);
358  }
359  
360  #ifdef RESOURCE_TRACK
init_resource_track(struct resource_track * track,io_channel channel)361  void init_resource_track(struct resource_track *track, io_channel channel)
362  {
363  #ifdef HAVE_GETRUSAGE
364  	struct rusage r;
365  #endif
366  	io_stats io_start = 0;
367  
368  	track->brk_start = sbrk(0);
369  	gettimeofday(&track->time_start, 0);
370  #ifdef HAVE_GETRUSAGE
371  #ifdef sun
372  	memset(&r, 0, sizeof(struct rusage));
373  #endif
374  	getrusage(RUSAGE_SELF, &r);
375  	track->user_start = r.ru_utime;
376  	track->system_start = r.ru_stime;
377  #else
378  	track->user_start.tv_sec = track->user_start.tv_usec = 0;
379  	track->system_start.tv_sec = track->system_start.tv_usec = 0;
380  #endif
381  	track->bytes_read = 0;
382  	track->bytes_written = 0;
383  	if (channel && channel->manager && channel->manager->get_stats)
384  		channel->manager->get_stats(channel, &io_start);
385  	if (io_start) {
386  		track->bytes_read = io_start->bytes_read;
387  		track->bytes_written = io_start->bytes_written;
388  	}
389  }
390  
391  #ifdef __GNUC__
392  #define _INLINE_ __inline__
393  #else
394  #define _INLINE_
395  #endif
396  
timeval_subtract(struct timeval * tv1,struct timeval * tv2)397  static _INLINE_ float timeval_subtract(struct timeval *tv1,
398  				       struct timeval *tv2)
399  {
400  	return ((tv1->tv_sec - tv2->tv_sec) +
401  		((float) (tv1->tv_usec - tv2->tv_usec)) / 1000000);
402  }
403  
print_resource_track(e2fsck_t ctx,const char * desc,struct resource_track * track,io_channel channel)404  void print_resource_track(e2fsck_t ctx, const char *desc,
405  			  struct resource_track *track, io_channel channel)
406  {
407  #ifdef HAVE_GETRUSAGE
408  	struct rusage r;
409  #endif
410  #ifdef HAVE_MALLINFO
411  	struct mallinfo	malloc_info;
412  #endif
413  	struct timeval time_end;
414  
415  	if ((desc && !(ctx->options & E2F_OPT_TIME2)) ||
416  	    (!desc && !(ctx->options & E2F_OPT_TIME)))
417  		return;
418  
419  	e2fsck_clear_progbar(ctx);
420  	gettimeofday(&time_end, 0);
421  
422  	if (desc)
423  		log_out(ctx, "%s: ", desc);
424  
425  #ifdef HAVE_MALLINFO
426  #define kbytes(x)	(((unsigned long)(x) + 1023) / 1024)
427  
428  	malloc_info = mallinfo();
429  	log_out(ctx, _("Memory used: %luk/%luk (%luk/%luk), "),
430  		kbytes(malloc_info.arena), kbytes(malloc_info.hblkhd),
431  		kbytes(malloc_info.uordblks), kbytes(malloc_info.fordblks));
432  #else
433  	log_out(ctx, _("Memory used: %lu, "),
434  		(unsigned long) (((char *) sbrk(0)) -
435  				 ((char *) track->brk_start)));
436  #endif
437  #ifdef HAVE_GETRUSAGE
438  	getrusage(RUSAGE_SELF, &r);
439  
440  	log_out(ctx, _("time: %5.2f/%5.2f/%5.2f\n"),
441  		timeval_subtract(&time_end, &track->time_start),
442  		timeval_subtract(&r.ru_utime, &track->user_start),
443  		timeval_subtract(&r.ru_stime, &track->system_start));
444  #else
445  	log_out(ctx, _("elapsed time: %6.3f\n"),
446  		timeval_subtract(&time_end, &track->time_start));
447  #endif
448  #define mbytes(x)	(((x) + 1048575) / 1048576)
449  	if (channel && channel->manager && channel->manager->get_stats) {
450  		io_stats delta = 0;
451  		unsigned long long bytes_read = 0;
452  		unsigned long long bytes_written = 0;
453  
454  		if (desc)
455  			log_out(ctx, "%s: ", desc);
456  
457  		channel->manager->get_stats(channel, &delta);
458  		if (delta) {
459  			bytes_read = delta->bytes_read - track->bytes_read;
460  			bytes_written = delta->bytes_written -
461  				track->bytes_written;
462  		}
463  		log_out(ctx, "I/O read: %lluMB, write: %lluMB, "
464  			"rate: %.2fMB/s\n",
465  			mbytes(bytes_read), mbytes(bytes_written),
466  			(double)mbytes(bytes_read + bytes_written) /
467  			timeval_subtract(&time_end, &track->time_start));
468  	}
469  }
470  #endif /* RESOURCE_TRACK */
471  
e2fsck_read_inode(e2fsck_t ctx,unsigned long ino,struct ext2_inode * inode,const char * proc)472  void e2fsck_read_inode(e2fsck_t ctx, unsigned long ino,
473  			      struct ext2_inode * inode, const char *proc)
474  {
475  	errcode_t retval;
476  
477  	retval = ext2fs_read_inode(ctx->fs, ino, inode);
478  	if (retval) {
479  		com_err("ext2fs_read_inode", retval,
480  			_("while reading inode %lu in %s"), ino, proc);
481  		fatal_error(ctx, 0);
482  	}
483  }
484  
e2fsck_read_inode_full(e2fsck_t ctx,unsigned long ino,struct ext2_inode * inode,int bufsize,const char * proc)485  void e2fsck_read_inode_full(e2fsck_t ctx, unsigned long ino,
486  			    struct ext2_inode *inode, int bufsize,
487  			    const char *proc)
488  {
489  	errcode_t retval;
490  
491  	retval = ext2fs_read_inode_full(ctx->fs, ino, inode, bufsize);
492  	if (retval) {
493  		com_err("ext2fs_read_inode_full", retval,
494  			_("while reading inode %lu in %s"), ino, proc);
495  		fatal_error(ctx, 0);
496  	}
497  }
498  
e2fsck_write_inode_full(e2fsck_t ctx,unsigned long ino,struct ext2_inode * inode,int bufsize,const char * proc)499  void e2fsck_write_inode_full(e2fsck_t ctx, unsigned long ino,
500  			     struct ext2_inode * inode, int bufsize,
501  			     const char *proc)
502  {
503  	errcode_t retval;
504  
505  	retval = ext2fs_write_inode_full(ctx->fs, ino, inode, bufsize);
506  	if (retval) {
507  		com_err("ext2fs_write_inode", retval,
508  			_("while writing inode %lu in %s"), ino, proc);
509  		fatal_error(ctx, 0);
510  	}
511  }
512  
e2fsck_write_inode(e2fsck_t ctx,unsigned long ino,struct ext2_inode * inode,const char * proc)513  void e2fsck_write_inode(e2fsck_t ctx, unsigned long ino,
514  			struct ext2_inode * inode, const char *proc)
515  {
516  	errcode_t retval;
517  
518  	retval = ext2fs_write_inode(ctx->fs, ino, inode);
519  	if (retval) {
520  		com_err("ext2fs_write_inode", retval,
521  			_("while writing inode %lu in %s"), ino, proc);
522  		fatal_error(ctx, 0);
523  	}
524  }
525  
526  #ifdef MTRACE
mtrace_print(char * mesg)527  void mtrace_print(char *mesg)
528  {
529  	FILE	*malloc_get_mallstream();
530  	FILE	*f = malloc_get_mallstream();
531  
532  	if (f)
533  		fprintf(f, "============= %s\n", mesg);
534  }
535  #endif
536  
get_backup_sb(e2fsck_t ctx,ext2_filsys fs,const char * name,io_manager manager)537  blk64_t get_backup_sb(e2fsck_t ctx, ext2_filsys fs, const char *name,
538  		      io_manager manager)
539  {
540  	struct ext2_super_block *sb;
541  	io_channel		io = NULL;
542  	void			*buf = NULL;
543  	int			blocksize;
544  	blk64_t			superblock, ret_sb = 8193;
545  
546  	if (fs && fs->super) {
547  		ret_sb = (fs->super->s_blocks_per_group +
548  			  fs->super->s_first_data_block);
549  		if (ctx) {
550  			ctx->superblock = ret_sb;
551  			ctx->blocksize = fs->blocksize;
552  		}
553  		return ret_sb;
554  	}
555  
556  	if (ctx) {
557  		if (ctx->blocksize) {
558  			ret_sb = ctx->blocksize * 8;
559  			if (ctx->blocksize == 1024)
560  				ret_sb++;
561  			ctx->superblock = ret_sb;
562  			return ret_sb;
563  		}
564  		ctx->superblock = ret_sb;
565  		ctx->blocksize = 1024;
566  	}
567  
568  	if (!name || !manager)
569  		goto cleanup;
570  
571  	if (manager->open(name, 0, &io) != 0)
572  		goto cleanup;
573  
574  	if (ext2fs_get_mem(SUPERBLOCK_SIZE, &buf))
575  		goto cleanup;
576  	sb = (struct ext2_super_block *) buf;
577  
578  	for (blocksize = EXT2_MIN_BLOCK_SIZE;
579  	     blocksize <= EXT2_MAX_BLOCK_SIZE ; blocksize *= 2) {
580  		superblock = blocksize*8;
581  		if (blocksize == 1024)
582  			superblock++;
583  		io_channel_set_blksize(io, blocksize);
584  		if (io_channel_read_blk64(io, superblock,
585  					-SUPERBLOCK_SIZE, buf))
586  			continue;
587  #ifdef WORDS_BIGENDIAN
588  		if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
589  			ext2fs_swap_super(sb);
590  #endif
591  		if ((sb->s_magic == EXT2_SUPER_MAGIC) &&
592  		    (EXT2_BLOCK_SIZE(sb) == blocksize)) {
593  			ret_sb = superblock;
594  			if (ctx) {
595  				ctx->superblock = superblock;
596  				ctx->blocksize = blocksize;
597  			}
598  			break;
599  		}
600  	}
601  
602  cleanup:
603  	if (io)
604  		io_channel_close(io);
605  	if (buf)
606  		ext2fs_free_mem(&buf);
607  	return (ret_sb);
608  }
609  
610  /*
611   * Given a mode, return the ext2 file type
612   */
ext2_file_type(unsigned int mode)613  int ext2_file_type(unsigned int mode)
614  {
615  	if (LINUX_S_ISREG(mode))
616  		return EXT2_FT_REG_FILE;
617  
618  	if (LINUX_S_ISDIR(mode))
619  		return EXT2_FT_DIR;
620  
621  	if (LINUX_S_ISCHR(mode))
622  		return EXT2_FT_CHRDEV;
623  
624  	if (LINUX_S_ISBLK(mode))
625  		return EXT2_FT_BLKDEV;
626  
627  	if (LINUX_S_ISLNK(mode))
628  		return EXT2_FT_SYMLINK;
629  
630  	if (LINUX_S_ISFIFO(mode))
631  		return EXT2_FT_FIFO;
632  
633  	if (LINUX_S_ISSOCK(mode))
634  		return EXT2_FT_SOCK;
635  
636  	return 0;
637  }
638  
639  /*
640   * Check to see if a filesystem is in /proc/filesystems.
641   * Returns 1 if found, 0 if not
642   */
fs_proc_check(const char * fs_name)643  int fs_proc_check(const char *fs_name)
644  {
645  	FILE	*f;
646  	char	buf[80], *cp, *t;
647  
648  	f = fopen("/proc/filesystems", "r");
649  	if (!f)
650  		return (0);
651  	while (!feof(f)) {
652  		if (!fgets(buf, sizeof(buf), f))
653  			break;
654  		cp = buf;
655  		if (!isspace(*cp)) {
656  			while (*cp && !isspace(*cp))
657  				cp++;
658  		}
659  		while (*cp && isspace(*cp))
660  			cp++;
661  		if ((t = strchr(cp, '\n')) != NULL)
662  			*t = 0;
663  		if ((t = strchr(cp, '\t')) != NULL)
664  			*t = 0;
665  		if ((t = strchr(cp, ' ')) != NULL)
666  			*t = 0;
667  		if (!strcmp(fs_name, cp)) {
668  			fclose(f);
669  			return (1);
670  		}
671  	}
672  	fclose(f);
673  	return (0);
674  }
675  
676  /*
677   * Check to see if a filesystem is available as a module
678   * Returns 1 if found, 0 if not
679   */
check_for_modules(const char * fs_name)680  int check_for_modules(const char *fs_name)
681  {
682  #ifdef __linux__
683  	struct utsname	uts;
684  	FILE		*f;
685  	char		buf[1024], *cp, *t;
686  	int		i;
687  
688  	if (uname(&uts))
689  		return (0);
690  	snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
691  
692  	f = fopen(buf, "r");
693  	if (!f)
694  		return (0);
695  	while (!feof(f)) {
696  		if (!fgets(buf, sizeof(buf), f))
697  			break;
698  		if ((cp = strchr(buf, ':')) != NULL)
699  			*cp = 0;
700  		else
701  			continue;
702  		if ((cp = strrchr(buf, '/')) != NULL)
703  			cp++;
704  		else
705  			cp = buf;
706  		i = strlen(cp);
707  		if (i > 3) {
708  			t = cp + i - 3;
709  			if (!strcmp(t, ".ko"))
710  				*t = 0;
711  		}
712  		if (!strcmp(cp, fs_name)) {
713  			fclose(f);
714  			return (1);
715  		}
716  	}
717  	fclose(f);
718  #endif /* __linux__ */
719  	return (0);
720  }
721  
722  /*
723   * Helper function that does the right thing if write returns a
724   * partial write, or an EGAIN/EINTR error.
725   */
write_all(int fd,char * buf,size_t count)726  int write_all(int fd, char *buf, size_t count)
727  {
728  	ssize_t ret;
729  	int c = 0;
730  
731  	while (count > 0) {
732  		ret = write(fd, buf, count);
733  		if (ret < 0) {
734  			if ((errno == EAGAIN) || (errno == EINTR))
735  				continue;
736  			return -1;
737  		}
738  		count -= ret;
739  		buf += ret;
740  		c += ret;
741  	}
742  	return c;
743  }
744  
dump_mmp_msg(struct mmp_struct * mmp,const char * msg)745  void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
746  {
747  
748  	if (msg)
749  		printf("MMP check failed: %s\n", msg);
750  	if (mmp) {
751  		time_t t = mmp->mmp_time;
752  
753  		printf("MMP error info: last update: %s node: %s device: %s\n",
754  		       ctime(&t), mmp->mmp_nodename, mmp->mmp_bdevname);
755  	}
756  }
757  
e2fsck_mmp_update(ext2_filsys fs)758  errcode_t e2fsck_mmp_update(ext2_filsys fs)
759  {
760  	errcode_t retval;
761  
762  	retval = ext2fs_mmp_update(fs);
763  	if (retval == EXT2_ET_MMP_CHANGE_ABORT)
764  		dump_mmp_msg(fs->mmp_cmp,
765  			     _("UNEXPECTED INCONSISTENCY: the filesystem is "
766  			       "being modified while fsck is running.\n"));
767  
768  	return retval;
769  }
770  
e2fsck_set_bitmap_type(ext2_filsys fs,unsigned int default_type,const char * profile_name,unsigned int * old_type)771  void e2fsck_set_bitmap_type(ext2_filsys fs, unsigned int default_type,
772  			    const char *profile_name, unsigned int *old_type)
773  {
774  	unsigned type;
775  	e2fsck_t ctx = (e2fsck_t) fs->priv_data;
776  
777  	if (old_type)
778  		*old_type = fs->default_bitmap_type;
779  	profile_get_uint(ctx->profile, "bitmaps", profile_name, 0,
780  			 default_type, &type);
781  	profile_get_uint(ctx->profile, "bitmaps", "all", 0, type, &type);
782  	fs->default_bitmap_type = type ? type : default_type;
783  }
784  
e2fsck_allocate_inode_bitmap(ext2_filsys fs,const char * descr,int deftype,const char * name,ext2fs_inode_bitmap * ret)785  errcode_t e2fsck_allocate_inode_bitmap(ext2_filsys fs, const char *descr,
786  				       int deftype,
787  				       const char *name,
788  				       ext2fs_inode_bitmap *ret)
789  {
790  	errcode_t	retval;
791  	unsigned int	save_type;
792  
793  	e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
794  	retval = ext2fs_allocate_inode_bitmap(fs, descr, ret);
795  	fs->default_bitmap_type = save_type;
796  	return retval;
797  }
798  
e2fsck_allocate_block_bitmap(ext2_filsys fs,const char * descr,int deftype,const char * name,ext2fs_block_bitmap * ret)799  errcode_t e2fsck_allocate_block_bitmap(ext2_filsys fs, const char *descr,
800  				       int deftype,
801  				       const char *name,
802  				       ext2fs_block_bitmap *ret)
803  {
804  	errcode_t	retval;
805  	unsigned int	save_type;
806  
807  	e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
808  	retval = ext2fs_allocate_block_bitmap(fs, descr, ret);
809  	fs->default_bitmap_type = save_type;
810  	return retval;
811  }
812  
e2fsck_allocate_subcluster_bitmap(ext2_filsys fs,const char * descr,int deftype,const char * name,ext2fs_block_bitmap * ret)813  errcode_t e2fsck_allocate_subcluster_bitmap(ext2_filsys fs, const char *descr,
814  					    int deftype,
815  					    const char *name,
816  					    ext2fs_block_bitmap *ret)
817  {
818  	errcode_t	retval;
819  	unsigned int	save_type;
820  
821  	e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
822  	retval = ext2fs_allocate_subcluster_bitmap(fs, descr, ret);
823  	fs->default_bitmap_type = save_type;
824  	return retval;
825  }
826  
827  /* Return memory size in bytes */
get_memory_size(void)828  unsigned long long get_memory_size(void)
829  {
830  #if defined(_SC_PHYS_PAGES)
831  # if defined(_SC_PAGESIZE)
832  	return (unsigned long long)sysconf(_SC_PHYS_PAGES) *
833  	       (unsigned long long)sysconf(_SC_PAGESIZE);
834  # elif defined(_SC_PAGE_SIZE)
835  	return (unsigned long long)sysconf(_SC_PHYS_PAGES) *
836  	       (unsigned long long)sysconf(_SC_PAGE_SIZE);
837  # endif
838  #elif defined(CTL_HW)
839  # if (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
840  #  define CTL_HW_INT64
841  # elif (defined(HW_PHYSMEM) || defined(HW_REALMEM))
842  #  define CTL_HW_UINT
843  # endif
844  	int mib[2];
845  
846  	mib[0] = CTL_HW;
847  # if defined(HW_MEMSIZE)
848  	mib[1] = HW_MEMSIZE;
849  # elif defined(HW_PHYSMEM64)
850  	mib[1] = HW_PHYSMEM64;
851  # elif defined(HW_REALMEM)
852  	mib[1] = HW_REALMEM;
853  # elif defined(HW_PYSMEM)
854  	mib[1] = HW_PHYSMEM;
855  # endif
856  # if defined(CTL_HW_INT64)
857  	unsigned long long size = 0;
858  # elif defined(CTL_HW_UINT)
859  	unsigned int size = 0;
860  # endif
861  # if defined(CTL_HW_INT64) || defined(CTL_HW_UINT)
862  	size_t len = sizeof(size);
863  
864  	if (sysctl(mib, 2, &size, &len, NULL, 0) == 0)
865  		return (unsigned long long)size;
866  # endif
867  	return 0;
868  #else
869  # warning "Don't know how to detect memory on your platform?"
870  	return 0;
871  #endif
872  }
873