summaryrefslogtreecommitdiff
path: root/ufs-fsck/utilities.c
blob: d5ff8c1b14d8b2d7a2d4617021dbd4749d1fd1b7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
/* Miscellaneous functions for fsck
   Copyright (C) 1994, 1995 Free Software Foundation, Inc.
   Written by Michael I. Bushnell.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include "fsck.h"
#include <fcntl.h>
#include <sys/file.h>
#include <unistd.h>
#include <stdarg.h>
#include <pwd.h>

/* Read disk block ADDR into BUF of SIZE bytes. */
void
readblock (daddr_t addr, void *buf, size_t size)
{
  if (lseek (readfd, addr * DEV_BSIZE, L_SET) == -1)
    errexit ("CANNOT SEEK TO BLOCK %ld", addr);
  if (read (readfd, buf, size) != size)
    errexit ("CANNOT READ BLOCK %ld", addr);
}

/* Write disk block BLKNO from BUF of SIZE bytes. */
void
writeblock (daddr_t addr, void *buf, size_t size)
{
  if (lseek (writefd, addr * DEV_BSIZE, L_SET) == -1)
    errexit ("CANNOT SEEK TO BLOCK %ld", addr);
  if (write (writefd, buf, size) != size)
    errexit ("CANNOT WRITE BLOCK %ld", addr);
  fsmodified = 1;
}

/* Last filesystem fragment that we read an inode from */
static char *lastifrag;
static daddr_t lastifragaddr;

/* Read inode number INO into DINODE. */
void
getinode (ino_t ino, struct dinode *di)
{
  daddr_t iblk;

  if (!lastifrag)
    lastifrag = malloc (sblock->fs_bsize);
  
  iblk = ino_to_fsba (sblock, ino);
  if (iblk != lastifragaddr)
    readblock (fsbtodb (sblock, iblk), lastifrag, sblock->fs_bsize);
  lastifragaddr = iblk;
  bcopy (lastifrag + ino_to_fsbo (sblock, ino) * sizeof (struct dinode), 
	 di, sizeof (struct dinode));
}

/* Write inode number INO from DINODE. */
void
write_inode (ino_t ino, struct dinode *di)
{
  daddr_t iblk;
  
  iblk = ino_to_fsba (sblock, ino);
  if (iblk != lastifragaddr)
    readblock (fsbtodb (sblock, iblk), lastifrag, sblock->fs_bsize);
  lastifragaddr = iblk;
  bcopy (di, lastifrag + ino_to_fsbo (sblock, ino) * sizeof (struct dinode),
	 sizeof (struct dinode));
  writeblock (fsbtodb (sblock, iblk), lastifrag, sblock->fs_bsize);
}

/* Clear inode number INO and zero DI. */
void
clear_inode (ino_t ino, struct dinode *di)
{
  bzero (di, sizeof (struct dinode));
  write_inode (ino, di);
}

/* Allocate and return a block and account for it in all the block
   maps locally.  Don't trust or change the disk block maps.
   The block should be NFRAGS fragments long.  */
daddr_t
allocblk (int nfrags)
{
  daddr_t i;
  int j, k;
  
  if (nfrags <= 0 || nfrags > sblock->fs_frag)
    return 0;
  
  /* Examine each block of the filesystem.  */
  for (i = 0; i < maxfsblock - sblock->fs_frag; i += sblock->fs_frag)
    {
      /* For each piece of the block big enough to hold this frag... */
      for (j = 0; j <= sblock->fs_frag - nfrags; j++)
	{
	  /* For each frag of this piece... */
	  for (k = 0; k < nfrags; k++)
	    if (testbmap (i + j + k))
	      break;
	  
	  /* If one of the frags was allocated... */
	  if (k < nfrags)
	    {
	      /* Skip at least that far (short cut) */
	      j += k;
	      continue;
	    }
	  
	  /* It's free (at address i + j) */

	  /* Mark the frags allocated in our map */
	  for (k = 0; k < nfrags; k++)
	    setbmap (i + j + k);
	  
	  return (i + j);
	}
    }
  return 0;
}

/* Check if a block starting at BLK and extending for CNT 
   fragments is out of range; if it is, then return 1; otherwise return 0. */
int
check_range (daddr_t blk, int cnt)
{
  int c;
  
  if ((unsigned)(blk + cnt) > maxfsblock)
    return 1;
  
  c = dtog (sblock, blk);
  if (blk < cgdmin (sblock, c))
    {
      if (blk + cnt > cgsblock (sblock, c))
	return 1;
    }
  else
    {
      if (blk + cnt > cgbase (sblock, c + 1))
	return 1;
    }
  
  return 0;
}  

/* Like printf, but exit if we are preening. */
int
pfatal (char *fmt, ...)
{
  va_list args;
  int ret;
  
  va_start (args, fmt);
  ret = vprintf (fmt, args);
  va_end (args);
  putchar ('\n');
  if (preen)
    exit (1);
  
  return ret;
}

/* Like printf, but exit after printing. */
void
errexit (char *fmt, ...)
{
  va_list args;

  va_start (args, fmt);
  vprintf (fmt, args);
  va_end (args);
  putchar ('\n');
  exit (1);
}

/* Like printf, but give more information (when we fully support it) 
   when preening. */
int
pwarn (char *fmt, ...)
{
  va_list args;
  int ret;

  va_start (args, fmt);
  ret = vprintf (fmt, args);
  va_end (args);
  return ret;
}

/* Ask the user a question; return 1 if the user says yes, and 0
   if the user says no. */
int
reply (char *question)
{
  int persevere;
  char c;
  
  if (preen)
    pfatal ("INTERNAL ERROR: GOT TO reply ()");

  persevere = !strcmp (question, "CONTINUE");
  putchar ('\n');
  if (!persevere && (nowrite || writefd < 0))
    {
      printf ("%s? no\n\n", question);
      return 0;
    }
  else if (noquery || (persevere && nowrite))
    {
      printf ("%s? yes\n\n", question);
      return 1;
    }
 else
    {
      do
	{
	  printf ("%s? [yn] ", question);
	  fflush (stdout);
	  c = getchar ();
	  while (c != '\n' && getchar () != '\n')
	    if (feof (stdin))
	      return 0;
	}
      while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
      putchar ('\n');
      return c == 'y' || c == 'Y';
    }
}

/* Print a helpful description of the given inode number. */
void
pinode (ino_t ino)
{
  struct dinode dino;
  struct passwd *pw;
  char *p;

  printf (" I=%d ", ino);
  if (ino < ROOTINO || ino > maxino)
    return;
  getinode (ino, &dino);
  
  printf (" OWNER=");
  pw = getpwuid (dino.di_uid);
  if (pw)
    printf ("%s ", pw->pw_name);
  else
    printf ("%lu ", dino.di_uid);
  
  printf (" MODE=%o\n", DI_MODE (&dino));
  printf ("SIZE=%llu ", dino.di_size);
  p = ctime (&dino.di_mtime.ts_sec);
  printf ("MTIME=%12.12s %4.4s ", &p[4], &p[20]);
}