e2fsck/util.c

   1 /*
   2  * util.c --- miscellaneous utilities
   3  *
   4  * Copyright (C) 1993, 1994 Theodore Ts'o.  This file may be
   5  * redistributed under the terms of the GNU Public License.
   6  */
   7
   8 #include <stdlib.h>
   9 #include <unistd.h>
  10 #include <string.h>
  11 #include <ctype.h>
  12 #include <termios.h>
  13 #include <sys/resource.h>
  14
  15 #include "e2fsck.h"
  16
  17 const char * fix_msg[2] = { "IGNORED", "FIXED" };
  18 const char * clear_msg[2] = { "IGNORED", "CLEARED" };
  19
  20 void fatal_error (const char *msg)
  21 {
  22         if (msg)
  23                 fprintf (stderr, "%s: %s\n", program_name, msg);
  24         exit(FSCK_ERROR);
  25 }
  26
  27 void *allocate_memory(int size, const char *description)
  28 {
  29         void *ret;
  30         char buf[256];
  31
  32 #ifdef DEBUG_ALLOCATE_MEMORY
  33         printf("Allocating %d bytes for %s...\n", size, description);
  34 #endif
  35         ret = malloc(size);
  36         if (!ret) {
  37                 sprintf(buf, "%%s: Can't allocate %s\n", description);
  38                 fatal_error(buf);
  39         }
  40         memset(ret, 0, size);
  41         return ret;
  42 }
  43
  44
  45 int ask_yn(const char * string, int def)
  46 {
  47         int             c;
  48         struct termios  termios, tmp;
  49         const char      *defstr;
  50
  51         tcgetattr (0, &termios);
  52         tmp = termios;
  53         tmp.c_lflag &= ~(ICANON | ECHO);
  54         tcsetattr (0, TCSANOW, &tmp);
  55
  56         if (def == 1)
  57                 defstr = "<y>";
  58         else if (def == 0)
  59                 defstr = "<n>";
  60         else
  61                 defstr = " (y/n)";
  62         printf("%s%s? ", string, defstr);
  63         while (1) {
  64                 fflush (stdout);
  65                 if ((c = getchar()) == EOF)
  66                         break;
  67                 c = toupper(c);
  68                 if (c == 'Y') {
  69                         def = 1;
  70                         break;
  71                 }
  72                 else if (c == 'N') {
  73                         def = 0;
  74                         break;
  75                 }
  76                 else if ((c == ' ' || c == '\n') && (def != -1))
  77                         break;
  78         }
  79         if (def)
  80                 printf ("yes\n\n");
  81         else
  82                 printf ("no\n\n");
  83         tcsetattr (0, TCSANOW, &termios);
  84         return def;
  85 }
  86
  87 int ask (const char * string, int def)
  88 {
  89         if (nflag) {
  90                 printf ("%s? no\n\n", string);
  91                 return 0;
  92         }
  93         if (yflag) {
  94                 printf ("%s? yes\n\n", string);
  95                 return 1;
  96         }
  97         if (preen) {
  98                 printf ("%s? %s\n\n", string, def ? "yes" : "no");
  99                 return def;
 100         }
 101         return ask_yn(string, def);
 102 }
 103
 104 void read_bitmaps(ext2_filsys fs)
 105 {
 106         errcode_t       retval;
 107
 108         if (!fs->inode_map) {
 109                 ehandler_operation("reading inode bitmaps");
 110                 retval = ext2fs_read_inode_bitmap(fs);
 111                 ehandler_operation(0);
 112                 if (retval) {
 113                         com_err(program_name, retval,
 114                                 "while retrying to read inode bitmaps for %s",
 115                                 device_name);
 116                         fatal_error(0);
 117                 }
 118         }
 119
 120         if (!fs->block_map) {
 121                 ehandler_operation("reading block bitmaps");
 122                 retval = ext2fs_read_block_bitmap(fs);
 123                 ehandler_operation(0);
 124                 if (retval) {
 125                         com_err(program_name, retval,
 126                                 "while retrying to read block bitmaps for %s",
 127                                 device_name);
 128                         fatal_error(0);
 129                 }
 130         }
 131 }
 132
 133 void write_bitmaps(ext2_filsys fs)
 134 {
 135         errcode_t       retval;
 136
 137         if (ext2fs_test_bb_dirty(fs)) {
 138                 ehandler_operation("writing block bitmaps");
 139                 retval = ext2fs_write_block_bitmap(fs);
 140                 ehandler_operation(0);
 141                 if (retval) {
 142                         com_err(program_name, retval,
 143                                 "while retrying to write block bitmaps for %s",
 144                                 device_name);
 145                         fatal_error(0);
 146                 }
 147         }
 148
 149         if (ext2fs_test_ib_dirty(fs)) {
 150                 ehandler_operation("writing inode bitmaps");
 151                 retval = ext2fs_write_inode_bitmap(fs);
 152                 ehandler_operation(0);
 153                 if (retval) {
 154                         com_err(program_name, retval,
 155                                 "while retrying to write inode bitmaps for %s",
 156                                 device_name);
 157                         fatal_error(0);
 158                 }
 159         }
 160 }
 161
 162 void preenhalt(NOARGS)
 163 {
 164         if (!preen)
 165                 return;
 166         fprintf(stderr, "\n\n%s: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.\n",
 167                device_name);
 168         exit(FSCK_UNCORRECTED);
 169 }
 170
 171 void init_resource_track(struct resource_track *track)
 172 {
 173         struct rusage r;
 174
 175         track->brk_start = sbrk(0);
 176         gettimeofday(&track->time_start, 0);
 177         getrusage(RUSAGE_SELF, &r);
 178         track->user_start = r.ru_utime;
 179         track->system_start = r.ru_stime;
 180 }
 181
 182 static __inline__ float timeval_subtract(struct timeval *tv1,
 183                                          struct timeval *tv2)
 184 {
 185         return ((tv1->tv_sec - tv2->tv_sec) +
 186                 ((float) (tv1->tv_usec - tv2->tv_usec)) / 1000000);
 187 }
 188
 189 void print_resource_track(struct resource_track *track)
 190 {
 191         struct rusage r;
 192         struct timeval time_end;
 193
 194         gettimeofday(&time_end, 0);
 195         getrusage(RUSAGE_SELF, &r);
 196
 197         printf("Memory used: %d, elapsed time: %6.3f/%6.3f/%6.3f\n",
 198                (int) (((char *) sbrk(0)) - ((char *) track->brk_start)),
 199                timeval_subtract(&time_end, &track->time_start),
 200                timeval_subtract(&r.ru_utime, &track->user_start),
 201                timeval_subtract(&r.ru_stime, &track->system_start));
 202 }
 203
 204 /*
 205  * This function returns 1 if the inode's block entries actually
 206  * contain block entries.
 207  */
 208 int inode_has_valid_blocks(struct ext2_inode *inode)
 209 {
 210         /*
 211          * Only directories, regular files, and some symbolic links
 212          * have valid block entries.
 213          */
 214         if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
 215             !S_ISLNK(inode->i_mode))
 216                 return 0;
 217
 218         /*
 219          * If the symbolic link is a "fast symlink", then the symlink
 220          * target is stored in the block entries.
 221          */
 222         if (S_ISLNK (inode->i_mode) && inode->i_blocks == 0 &&
 223             inode->i_size < EXT2_N_BLOCKS * sizeof (unsigned long))
 224                 return 0;
 225
 226         return 1;
 227 }
 228
 229 #ifdef MTRACE
 230 void mtrace_print(char *mesg)
 231 {
 232         FILE    *malloc_get_mallstream();
 233         FILE    *f = malloc_get_mallstream();
 234
 235         if (f)
 236                 fprintf(f, "============= %s\n", mesg);
 237 }
 238 #endif
 239
 240