sbin/fsck_lfs/utilities.c

   1 /* $NetBSD: utilities.c,v 1.29 2010/01/07 01:39:56 christos Exp $        */
   2
   3 /*
   4  * Copyright (c) 1980, 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/time.h>
  34 #include <sys/mount.h>
  35
  36 #include <ufs/ufs/inode.h>
  37 #include <ufs/ufs/dir.h>
  38 #define buf ubuf
  39 #define vnode uvnode
  40 #include <ufs/lfs/lfs.h>
  41
  42 #include <err.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <ctype.h>
  47 #include <unistd.h>
  48 #include <errno.h>
  49
  50 #include <signal.h>
  51
  52 #include "bufcache.h"
  53 #include "vnode.h"
  54 #include "lfs_user.h"
  55 #include "segwrite.h"
  56
  57 #include "fsutil.h"
  58 #include "fsck.h"
  59 #include "extern.h"
  60 #include "exitvalues.h"
  61
  62 long diskreads, totalreads;     /* Disk cache statistics */
  63
  64 extern volatile sig_atomic_t returntosingle;
  65 extern off_t locked_queue_bytes;
  66
  67 int
  68 ftypeok(struct ufs1_dinode * dp)
  69 {
  70         switch (dp->di_mode & IFMT) {
  71
  72         case IFDIR:
  73         case IFREG:
  74         case IFBLK:
  75         case IFCHR:
  76         case IFLNK:
  77         case IFSOCK:
  78         case IFIFO:
  79                 return (1);
  80
  81         default:
  82                 if (debug)
  83                         pwarn("bad file type 0%o\n", dp->di_mode);
  84                 return (0);
  85         }
  86 }
  87
  88 int
  89 reply(const char *question)
  90 {
  91         int persevere;
  92         char c;
  93
  94         if (preen)
  95                 err(1, "INTERNAL ERROR: GOT TO reply()");
  96         persevere = !strcmp(question, "CONTINUE");
  97         pwarn("\n");
  98         if (!persevere && nflag) {
  99                 printf("%s? no\n\n", question);
 100                 return (0);
 101         }
 102         if (yflag || (persevere && nflag)) {
 103                 printf("%s? yes\n\n", question);
 104                 return (1);
 105         }
 106         do {
 107                 printf("%s? [yn] ", question);
 108                 (void) fflush(stdout);
 109                 c = getc(stdin);
 110                 while (c != '\n' && getc(stdin) != '\n')
 111                         if (feof(stdin))
 112                                 return (0);
 113         } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
 114         printf("\n");
 115         if (c == 'y' || c == 'Y')
 116                 return (1);
 117         return (0);
 118 }
 119
 120 static void
 121 write_superblocks(void)
 122 {
 123         if (debug)
 124                 pwarn("writing superblocks with lfs_idaddr = 0x%x\n",
 125                         (int)fs->lfs_idaddr);
 126         lfs_writesuper(fs, fs->lfs_sboffs[0]);
 127         lfs_writesuper(fs, fs->lfs_sboffs[1]);
 128         fsmodified = 1;
 129 }
 130
 131 void
 132 ckfini(int markclean)
 133 {
 134         if (locked_queue_bytes > 0) {
 135                 if (preen || reply("WRITE CHANGES TO DISK") == 1) {
 136                         if (preen == 0)
 137                                 pwarn("WRITING CHANGES TO DISK\n");
 138                         lfs_segwrite(fs, SEGM_CKP);
 139                         fsdirty = 0;
 140                         fsmodified = 1;
 141                 }
 142         }
 143
 144         if (!nflag && (fs->lfs_pflags & LFS_PF_CLEAN) == 0) {
 145                 fs->lfs_pflags |= LFS_PF_CLEAN;
 146                 fsmodified = 1;
 147         }
 148
 149         if (fsmodified && (preen || reply("UPDATE SUPERBLOCKS"))) {
 150                 sbdirty();
 151                 write_superblocks();
 152         }
 153         if (markclean && fsmodified) {
 154                 /*
 155                  * Mark the file system as clean, and sync the superblock.
 156                  */
 157                 if (preen)
 158                         pwarn("MARKING FILE SYSTEM CLEAN\n");
 159                 else if (!reply("MARK FILE SYSTEM CLEAN"))
 160                         markclean = 0;
 161                 if (markclean) {
 162                         fs->lfs_pflags |= LFS_PF_CLEAN;
 163                         sbdirty();
 164                         write_superblocks();
 165                         if (!preen)
 166                                 printf(
 167                                         "\n***** FILE SYSTEM MARKED CLEAN *****\n");
 168                 }
 169         }
 170
 171         if (debug)
 172                 bufstats();
 173         (void) close(fsreadfd);
 174 }
 175 /*
 176  * Free a previously allocated block
 177  */
 178 void
 179 freeblk(daddr_t blkno, long frags)
 180 {
 181         struct inodesc idesc;
 182
 183         idesc.id_blkno = blkno;
 184         idesc.id_numfrags = frags;
 185         (void) pass4check(&idesc);
 186 }
 187 /*
 188  * Find a pathname
 189  */
 190 void
 191 getpathname(char *namebuf, size_t namebuflen, ino_t curdir, ino_t ino)
 192 {
 193         int len;
 194         char *cp;
 195         struct inodesc idesc;
 196         static int busy = 0;
 197
 198         if (curdir == ino && ino == ROOTINO) {
 199                 (void) strlcpy(namebuf, "/", namebuflen);
 200                 return;
 201         }
 202         if (busy ||
 203             (statemap[curdir] != DSTATE && statemap[curdir] != DFOUND)) {
 204                 (void) strlcpy(namebuf, "?", namebuflen);
 205                 return;
 206         }
 207         busy = 1;
 208         memset(&idesc, 0, sizeof(struct inodesc));
 209         idesc.id_type = DATA;
 210         idesc.id_fix = IGNORE;
 211         cp = &namebuf[MAXPATHLEN - 1];
 212         *cp = '\0';
 213         if (curdir != ino) {
 214                 idesc.id_parent = curdir;
 215                 goto namelookup;
 216         }
 217         while (ino != ROOTINO) {
 218                 idesc.id_number = ino;
 219                 idesc.id_func = findino;
 220                 idesc.id_name = "..";
 221                 if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
 222                         break;
 223 namelookup:
 224                 idesc.id_number = idesc.id_parent;
 225                 idesc.id_parent = ino;
 226                 idesc.id_func = findname;
 227                 idesc.id_name = namebuf;
 228                 if (ginode(idesc.id_number) == NULL)
 229                         break;
 230                 if ((ckinode(ginode(idesc.id_number), &idesc) & FOUND) == 0)
 231                         break;
 232                 len = strlen(namebuf);
 233                 cp -= len;
 234                 memcpy(cp, namebuf, (size_t) len);
 235                 *--cp = '/';
 236                 if (cp < &namebuf[LFS_MAXNAMLEN])
 237                         break;
 238                 ino = idesc.id_number;
 239         }
 240         busy = 0;
 241         if (ino != ROOTINO)
 242                 *--cp = '?';
 243         memcpy(namebuf, cp, (size_t) (&namebuf[MAXPATHLEN] - cp));
 244 }
 245
 246 void
 247 catch(int n)
 248 {
 249         ckfini(0);
 250         _exit(FSCK_EXIT_SIGNALLED);
 251 }
 252 /*
 253  * When preening, allow a single quit to signal
 254  * a special exit after filesystem checks complete
 255  * so that reboot sequence may be interrupted.
 256  */
 257 void
 258 catchquit(int n)
 259 {
 260         static const char msg[] =
 261             "returning to single-user after filesystem check\n";
 262         int serrno = errno;
 263
 264         (void)write(STDOUT_FILENO, msg, sizeof(msg) - 1);
 265         returntosingle = 1;
 266         (void) signal(SIGQUIT, SIG_DFL);
 267         serrno = errno;
 268 }
 269 /*
 270  * Ignore a single quit signal; wait and flush just in case.
 271  * Used by child processes in preen.
 272  */
 273 void
 274 voidquit(int n)
 275 {
 276         int serrno = errno;
 277
 278         sleep(1);
 279         (void) signal(SIGQUIT, SIG_IGN);
 280         (void) signal(SIGQUIT, SIG_DFL);
 281         errno = serrno;
 282 }
 283 /*
 284  * determine whether an inode should be fixed.
 285  */
 286 int
 287 dofix(struct inodesc * idesc, const char *msg)
 288 {
 289
 290         switch (idesc->id_fix) {
 291
 292         case DONTKNOW:
 293                 if (idesc->id_type == DATA)
 294                         direrror(idesc->id_number, msg);
 295                 else
 296                         pwarn("%s", msg);
 297                 if (preen) {
 298                         printf(" (SALVAGED)\n");
 299                         idesc->id_fix = FIX;
 300                         return (ALTERED);
 301                 }
 302                 if (reply("SALVAGE") == 0) {
 303                         idesc->id_fix = NOFIX;
 304                         return (0);
 305                 }
 306                 idesc->id_fix = FIX;
 307                 return (ALTERED);
 308
 309         case FIX:
 310                 return (ALTERED);
 311
 312         case NOFIX:
 313         case IGNORE:
 314                 return (0);
 315
 316         default:
 317                 err(EEXIT, "UNKNOWN INODESC FIX MODE %d\n", idesc->id_fix);
 318         }
 319         /* NOTREACHED */
 320 }