dump/itime.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <stelian@popies.net>, 1999-2000
   6  *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
   7  */
   8
   9 /*-
  10  * Copyright (c) 1980, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #ifndef lint
  39 static const char rcsid[] =
  40         "$Id: itime.c,v 1.25 2003/03/30 15:40:36 stelian Exp $";
  41 #endif /* not lint */
  42
  43 #include <config.h>
  44 #include <errno.h>
  45 #include <fcntl.h>
  46 #include <stdio.h>
  47 #ifdef __STDC__
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #endif
  51
  52 #include <sys/param.h>
  53 #include <sys/time.h>
  54 #include <time.h>
  55 #include <fcntl.h>
  56 #ifdef  __linux__
  57 #ifdef HAVE_EXT2FS_EXT2_FS_H
  58 #include <ext2fs/ext2_fs.h>
  59 #else
  60 #include <linux/ext2_fs.h>
  61 #endif
  62 #include <ext2fs/ext2fs.h>
  63 #include <bsdcompat.h>
  64 #include <sys/file.h>
  65 #include <unistd.h>
  66 #elif defined sunos
  67 #include <sys/vnode.h>
  68
  69 #include <ufs/fsdir.h>
  70 #include <ufs/inode.h>
  71 #include <ufs/fs.h>
  72 #else
  73 #include <ufs/ufs/dinode.h>
  74 #endif
  75
  76 #include <protocols/dumprestore.h>
  77
  78 #include "dump.h"
  79
  80 struct  dumpdates **ddatev;
  81 int     nddates;
  82 int     ddates_in;
  83 struct  dumptime *dthead;
  84
  85 static  void dumprecout __P((FILE *, struct dumpdates *));
  86 static  int getrecord __P((FILE *, struct dumpdates *));
  87 static  int makedumpdate __P((struct dumpdates *, char *));
  88 static  void readdumptimes __P((FILE *));
  89
  90 void
  91 initdumptimes(int createdumpdates)
  92 {
  93         FILE *df;
  94         struct flock lock;
  95
  96         if ((df = fopen(dumpdates, "r")) == NULL) {
  97                 if (errno != ENOENT) {
  98                         quit("cannot read %s: %s\n", dumpdates,
  99                             strerror(errno));
 100                         /* NOTREACHED */
 101                 }
 102                 if (createdumpdates) {
 103                         /*
 104                          * Dumpdates does not exist, make an empty one.
 105                          */
 106                         msg("WARNING: no file `%s', making an empty one\n", dumpdates);
 107                         if ((df = fopen(dumpdates, "w")) == NULL) {
 108                                 quit("cannot create %s: %s\n", dumpdates,
 109                                 strerror(errno));
 110                                 /* NOTREACHED */
 111                         }
 112                         (void) fclose(df);
 113                         if ((df = fopen(dumpdates, "r")) == NULL) {
 114                                 quit("cannot read %s even after creating it: %s\n",
 115                                 dumpdates, strerror(errno));
 116                                 /* NOTREACHED */
 117                         }
 118                 }
 119                 else
 120                         msg("WARNING: no file `%s'\n", dumpdates);
 121         }
 122         if (df != NULL) {
 123                 memset(&lock, 0, sizeof(lock));
 124                 lock.l_type = F_RDLCK;
 125                 if (fcntl(fileno(df), F_SETLKW, &lock) < 0)
 126                         quit("cannot set read lock on %s: %s\n",
 127                                 dumpdates, strerror(errno));
 128                 readdumptimes(df);
 129                 (void) fclose(df);
 130         }
 131 }
 132
 133 static void
 134 readdumptimes(FILE *df)
 135 {
 136         int i;
 137         struct  dumptime *dtwalk;
 138
 139         for (;;) {
 140                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 141                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 142                         break;
 143                 nddates++;
 144                 dtwalk->dt_next = dthead;
 145                 dthead = dtwalk;
 146         }
 147
 148         ddates_in = 1;
 149         /*
 150          *      arrayify the list, leaving enough room for the additional
 151          *      record that we may have to add to the ddate structure
 152          */
 153         ddatev = (struct dumpdates **)
 154                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 155         dtwalk = dthead;
 156         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 157                 ddatev[i] = &dtwalk->dt_value;
 158 }
 159
 160 void
 161 getdumptime(int createdumpdates)
 162 {
 163         struct dumpdates *ddp;
 164         int i;
 165
 166 #ifdef FDEBUG
 167         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 168                 disk, dumpdates, level);
 169 #endif
 170         spcl.c_ddate = 0;
 171         lastlevel = '0';
 172
 173         /* If this is a level 0 dump, and we're not updating
 174            dumpdates, there's no point in trying to read
 175            dumpdates.  It may not exist yet, or may not be mounted.  For
 176            incrementals, we *must* read dumpdates (fail if it's not there!) */
 177         if ( (level == lastlevel) && !createdumpdates)
 178                 return;
 179         initdumptimes(createdumpdates);
 180         if (ddatev == NULL)
 181                 return;
 182         /*
 183          *      Go find the entry with the same name for a lower increment
 184          *      and older date
 185          */
 186         ITITERATE(i, ddp) {
 187                 if (strncmp(disk, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 188                         continue;
 189                 if (ddp->dd_level >= level)
 190                         continue;
 191                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 192                         continue;
 193                 spcl.c_ddate = ddp->dd_ddate;
 194                 lastlevel = ddp->dd_level;
 195         }
 196 }
 197
 198 void
 199 putdumptime(void)
 200 {
 201         FILE *df;
 202         struct dumpdates *dtwalk;
 203         int i;
 204         int fd;
 205         struct flock lock;
 206
 207         if(uflag == 0)
 208                 return;
 209         if ((df = fopen(dumpdates, "r+")) == NULL)
 210                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 211         fd = fileno(df);
 212         memset(&lock, 0, sizeof(lock));
 213         lock.l_type = F_WRLCK;
 214         if (fcntl(fd, F_SETLKW, &lock) < 0)
 215                 quit("cannot set write lock on %s: %s\n", dumpdates, strerror(errno));
 216         free((char *)ddatev);
 217         ddatev = 0;
 218         nddates = 0;
 219         dthead = 0;
 220         ddates_in = 0;
 221         readdumptimes(df);
 222         if (fseek(df, 0L, 0) < 0)
 223                 quit("fseek: %s\n", strerror(errno));
 224         spcl.c_ddate = 0;
 225         ITITERATE(i, dtwalk) {
 226                 if (strncmp(disk, dtwalk->dd_name,
 227                                 sizeof (dtwalk->dd_name)) != 0)
 228                         continue;
 229                 if (dtwalk->dd_level != level)
 230                         continue;
 231                 goto found;
 232         }
 233         /*
 234          *      construct the new upper bound;
 235          *      Enough room has been allocated.
 236          */
 237         dtwalk = ddatev[nddates] =
 238                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 239         nddates += 1;
 240   found:
 241         (void) strncpy(dtwalk->dd_name, disk, sizeof (dtwalk->dd_name));
 242         dtwalk->dd_level = level;
 243         dtwalk->dd_ddate = spcl.c_date;
 244
 245         ITITERATE(i, dtwalk) {
 246                 dumprecout(df, dtwalk);
 247         }
 248         if (fflush(df))
 249                 quit("%s: %s\n", dumpdates, strerror(errno));
 250         if (ftruncate(fd, ftell(df)))
 251                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 252         (void) fclose(df);
 253 }
 254
 255 static void
 256 dumprecout(FILE *file, struct dumpdates *what)
 257 {
 258         char buf[26];
 259         struct tm *tms;
 260
 261         tms = localtime(&what->dd_ddate);
 262         strncpy(buf, asctime(tms), sizeof(buf));
 263         if (buf[24] != '\n' || buf[25] != '\0')
 264                 quit("asctime returned an unexpected string\n");
 265         buf[24] = 0;
 266         if (fprintf(file, "%s %c %s %c%2.2d%2.2d\n",
 267                     what->dd_name,
 268                     what->dd_level,
 269                     buf,
 270                     (tms->tm_gmtoff < 0 ? '-' : '+'),
 271                     abs(tms->tm_gmtoff) / 3600,
 272                     abs(tms->tm_gmtoff) % 3600 / 60) < 0)
 273                 quit("%s: %s\n", dumpdates, strerror(errno));
 274 }
 275
 276 int     recno;
 277
 278 static int
 279 getrecord(FILE *df, struct dumpdates *ddatep)
 280 {
 281         char tbuf[BUFSIZ];
 282
 283         recno = 0;
 284         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 285                 return(-1);
 286         recno++;
 287         if (makedumpdate(ddatep, tbuf) < 0)
 288                 msg("Unknown intermediate format in %s, line %d\n",
 289                         dumpdates, recno);
 290
 291 #ifdef FDEBUG
 292         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 293             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 294 #endif
 295         return(0);
 296 }
 297
 298 static int
 299 makedumpdate(struct dumpdates *ddp, char *tbuf)
 300 {
 301         char *tok;
 302
 303         /* device name */
 304         if ( NULL == (tok = strsep( &tbuf, " ")) )
 305                 return(-1);
 306         if ( strlen(tok) >  MAXPATHLEN )
 307                 return(-1);
 308         strcpy(ddp->dd_name, tok);
 309
 310         /* eat whitespace */
 311         for( ; *tbuf == ' ' ; tbuf++);
 312
 313         /* dump level */
 314         ddp->dd_level = *tbuf;
 315         ++tbuf;
 316
 317         /* eat whitespace */
 318         for( ; *tbuf == ' ' ; tbuf++);
 319
 320         /* dump date */
 321         ddp->dd_ddate = unctime(tbuf);
 322         if (ddp->dd_ddate < 0)
 323                 return(-1);
 324         /* fstab entry */
 325         ddp->dd_fstab = fstabsearch(ddp->dd_name);
 326         return(0);
 327 }