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 <pop@cybercable.fr>, 1999-2000
   6  */
   7
   8 /*-
   9  * Copyright (c) 1980, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #ifndef lint
  42 static const char rcsid[] =
  43         "$Id: itime.c,v 1.10 2000/03/01 10:16:05 stelian Exp $";
  44 #endif /* not lint */
  45
  46 #include <sys/param.h>
  47 #include <sys/time.h>
  48 #ifdef  __linux__
  49 #include <linux/ext2_fs.h>
  50 #include <bsdcompat.h>
  51 #include <sys/file.h>
  52 #include <unistd.h>
  53 #else
  54 #ifdef sunos
  55 #include <sys/vnode.h>
  56
  57 #include <ufs/fsdir.h>
  58 #include <ufs/inode.h>
  59 #include <ufs/fs.h>
  60 #else
  61 #include <ufs/ufs/dinode.h>
  62 #endif
  63 #endif
  64
  65 #include <protocols/dumprestore.h>
  66
  67 #include <errno.h>
  68 #include <fcntl.h>
  69 #include <stdio.h>
  70 #ifdef __STDC__
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #endif
  74
  75 #ifdef  __linux__
  76 #include <ext2fs/ext2fs.h>
  77 #endif
  78
  79 #include "dump.h"
  80
  81 struct  dumpdates **ddatev = 0;
  82 int     nddates = 0;
  83 int     ddates_in = 0;
  84 struct  dumptime *dthead = 0;
  85
  86 static  void dumprecout __P((FILE *, struct dumpdates *));
  87 static  int getrecord __P((FILE *, struct dumpdates *));
  88 static  int makedumpdate __P((struct dumpdates *, char *));
  89 static  void readdumptimes __P((FILE *));
  90
  91 void
  92 initdumptimes(int createdumpdates)
  93 {
  94         FILE *df;
  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                 (void) flock(fileno(df), LOCK_SH);
 124                 readdumptimes(df);
 125                 (void) fclose(df);
 126         }
 127 }
 128
 129 static void
 130 readdumptimes(FILE *df)
 131 {
 132         register int i;
 133         register struct dumptime *dtwalk;
 134
 135         for (;;) {
 136                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 137                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 138                         break;
 139                 nddates++;
 140                 dtwalk->dt_next = dthead;
 141                 dthead = dtwalk;
 142         }
 143
 144         ddates_in = 1;
 145         /*
 146          *      arrayify the list, leaving enough room for the additional
 147          *      record that we may have to add to the ddate structure
 148          */
 149         ddatev = (struct dumpdates **)
 150                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 151         dtwalk = dthead;
 152         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 153                 ddatev[i] = &dtwalk->dt_value;
 154 }
 155
 156 void
 157 getdumptime(int createdumpdates)
 158 {
 159         register struct dumpdates *ddp;
 160         register int i;
 161         char *fname;
 162
 163         fname = disk;
 164 #ifdef FDEBUG
 165         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 166                 fname, dumpdates, level);
 167 #endif
 168         spcl.c_ddate = 0;
 169         lastlevel = '0';
 170
 171         /* If this is a level 0 dump, and we're not updating
 172            dumpdates, there's no point in trying to read
 173            dumpdates.  It may not exist yet, or may not be mounted.  For
 174            incrementals, we *must* read dumpdates (fail if it's not there!) */
 175         if ( (level == lastlevel) && !createdumpdates)
 176                 return;
 177         initdumptimes(createdumpdates);
 178         if (ddatev == NULL)
 179                 return;
 180         /*
 181          *      Go find the entry with the same name for a lower increment
 182          *      and older date
 183          */
 184         ITITERATE(i, ddp) {
 185                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 186                         continue;
 187                 if (ddp->dd_level >= level)
 188                         continue;
 189 #ifdef  __linux__
 190                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 191 #else
 192                 if (ddp->dd_ddate <= spcl.c_ddate)
 193 #endif
 194                         continue;
 195                 spcl.c_ddate = ddp->dd_ddate;
 196                 lastlevel = ddp->dd_level;
 197         }
 198 }
 199
 200 void
 201 putdumptime(void)
 202 {
 203         FILE *df;
 204         register struct dumpdates *dtwalk;
 205         register int i;
 206         int fd;
 207         char *fname;
 208
 209         if(uflag == 0)
 210                 return;
 211         if ((df = fopen(dumpdates, "r+")) == NULL)
 212                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 213         fd = fileno(df);
 214         (void) flock(fd, LOCK_EX);
 215         fname = disk;
 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(fname, 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, fname, 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         msg("level %c dump on %s", level,
 254 #ifdef  __linux__
 255                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 256 #else
 257                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 258 #endif
 259 }
 260
 261 static void
 262 dumprecout(FILE *file, struct dumpdates *what)
 263 {
 264
 265         if (fprintf(file, "%s %c %s",
 266                     what->dd_name,
 267                     what->dd_level,
 268                     ctime(&what->dd_ddate)) < 0)
 269                 quit("%s: %s\n", dumpdates, strerror(errno));
 270 }
 271
 272 int     recno;
 273
 274 static int
 275 getrecord(FILE *df, struct dumpdates *ddatep)
 276 {
 277         char tbuf[BUFSIZ];
 278
 279         recno = 0;
 280         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 281                 return(-1);
 282         recno++;
 283         if (makedumpdate(ddatep, tbuf) < 0)
 284                 msg("Unknown intermediate format in %s, line %d\n",
 285                         dumpdates, recno);
 286
 287 #ifdef FDEBUG
 288         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 289             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 290 #endif
 291         return(0);
 292 }
 293
 294 static int
 295 makedumpdate(struct dumpdates *ddp, char *tbuf)
 296 {
 297         char *tok;
 298
 299         /* device name */
 300         if ( NULL == (tok = strsep( &tbuf, " ")) )
 301                 return(-1);
 302         if ( strlen(tok) >  MAXPATHLEN )
 303                 return(-1);
 304         strcpy(ddp->dd_name, tok);
 305
 306         /* eat whitespace */
 307         for( ; *tbuf == ' ' ; tbuf++);
 308
 309         /* dump level */
 310         ddp->dd_level = *tbuf;
 311         ++tbuf;
 312
 313         /* eat whitespace */
 314         for( ; *tbuf == ' ' ; tbuf++);
 315
 316         /* dump date */
 317         ddp->dd_ddate = unctime(tbuf);
 318         if (ddp->dd_ddate < 0)
 319                 return(-1);
 320         return(0);
 321 }