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@noos.fr>, 1999-2000
   6  *      Stelian Pop <pop@noos.fr> - Alcôve <www.alcove.fr>, 2000
   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. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] =
  44         "$Id: itime.c,v 1.14 2000/12/21 11:14:54 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <config.h>
  48 #include <sys/param.h>
  49 #include <sys/time.h>
  50 #ifdef  __linux__
  51 #include <linux/ext2_fs.h>
  52 #include <bsdcompat.h>
  53 #include <sys/file.h>
  54 #include <unistd.h>
  55 #else
  56 #ifdef sunos
  57 #include <sys/vnode.h>
  58
  59 #include <ufs/fsdir.h>
  60 #include <ufs/inode.h>
  61 #include <ufs/fs.h>
  62 #else
  63 #include <ufs/ufs/dinode.h>
  64 #endif
  65 #endif
  66
  67 #include <protocols/dumprestore.h>
  68
  69 #include <errno.h>
  70 #include <fcntl.h>
  71 #include <stdio.h>
  72 #ifdef __STDC__
  73 #include <stdlib.h>
  74 #include <string.h>
  75 #endif
  76
  77 #ifdef  __linux__
  78 #include <ext2fs/ext2fs.h>
  79 #endif
  80
  81 #include "dump.h"
  82
  83 struct  dumpdates **ddatev;
  84 int     nddates;
  85 int     ddates_in;
  86 struct  dumptime *dthead;
  87
  88 static  void dumprecout __P((FILE *, struct dumpdates *));
  89 static  int getrecord __P((FILE *, struct dumpdates *));
  90 static  int makedumpdate __P((struct dumpdates *, char *));
  91 static  void readdumptimes __P((FILE *));
  92
  93 void
  94 initdumptimes(int createdumpdates)
  95 {
  96         FILE *df;
  97
  98         if ((df = fopen(dumpdates, "r")) == NULL) {
  99                 if (errno != ENOENT) {
 100                         quit("cannot read %s: %s\n", dumpdates,
 101                             strerror(errno));
 102                         /* NOTREACHED */
 103                 }
 104                 if (createdumpdates) {
 105                         /*
 106                          * Dumpdates does not exist, make an empty one.
 107                          */
 108                         msg("WARNING: no file `%s', making an empty one\n", dumpdates);
 109                         if ((df = fopen(dumpdates, "w")) == NULL) {
 110                                 quit("cannot create %s: %s\n", dumpdates,
 111                                 strerror(errno));
 112                                 /* NOTREACHED */
 113                         }
 114                         (void) fclose(df);
 115                         if ((df = fopen(dumpdates, "r")) == NULL) {
 116                                 quit("cannot read %s even after creating it: %s\n",
 117                                 dumpdates, strerror(errno));
 118                                 /* NOTREACHED */
 119                         }
 120                 }
 121                 else
 122                         msg("WARNING: no file `%s'\n", dumpdates);
 123         }
 124         if (df != NULL) {
 125                 (void) flock(fileno(df), LOCK_SH);
 126                 readdumptimes(df);
 127                 (void) fclose(df);
 128         }
 129 }
 130
 131 static void
 132 readdumptimes(FILE *df)
 133 {
 134         register int i;
 135         register struct dumptime *dtwalk;
 136
 137         for (;;) {
 138                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 139                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 140                         break;
 141                 nddates++;
 142                 dtwalk->dt_next = dthead;
 143                 dthead = dtwalk;
 144         }
 145
 146         ddates_in = 1;
 147         /*
 148          *      arrayify the list, leaving enough room for the additional
 149          *      record that we may have to add to the ddate structure
 150          */
 151         ddatev = (struct dumpdates **)
 152                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 153         dtwalk = dthead;
 154         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 155                 ddatev[i] = &dtwalk->dt_value;
 156 }
 157
 158 void
 159 getdumptime(int createdumpdates)
 160 {
 161         register struct dumpdates *ddp;
 162         register int i;
 163         char *fname;
 164
 165         fname = disk;
 166 #ifdef FDEBUG
 167         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 168                 fname, 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(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 188                         continue;
 189                 if (ddp->dd_level >= level)
 190                         continue;
 191 #ifdef  __linux__
 192                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 193 #else
 194                 if (ddp->dd_ddate <= spcl.c_ddate)
 195 #endif
 196                         continue;
 197                 spcl.c_ddate = ddp->dd_ddate;
 198                 lastlevel = ddp->dd_level;
 199         }
 200 }
 201
 202 void
 203 putdumptime(void)
 204 {
 205         FILE *df;
 206         register struct dumpdates *dtwalk;
 207         register int i;
 208         int fd;
 209         char *fname;
 210
 211         if(uflag == 0)
 212                 return;
 213         if ((df = fopen(dumpdates, "r+")) == NULL)
 214                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 215         fd = fileno(df);
 216         (void) flock(fd, LOCK_EX);
 217         fname = disk;
 218         free((char *)ddatev);
 219         ddatev = 0;
 220         nddates = 0;
 221         dthead = 0;
 222         ddates_in = 0;
 223         readdumptimes(df);
 224         if (fseek(df, 0L, 0) < 0)
 225                 quit("fseek: %s\n", strerror(errno));
 226         spcl.c_ddate = 0;
 227         ITITERATE(i, dtwalk) {
 228                 if (strncmp(fname, dtwalk->dd_name,
 229                                 sizeof (dtwalk->dd_name)) != 0)
 230                         continue;
 231                 if (dtwalk->dd_level != level)
 232                         continue;
 233                 goto found;
 234         }
 235         /*
 236          *      construct the new upper bound;
 237          *      Enough room has been allocated.
 238          */
 239         dtwalk = ddatev[nddates] =
 240                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 241         nddates += 1;
 242   found:
 243         (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 244         dtwalk->dd_level = level;
 245         dtwalk->dd_ddate = spcl.c_date;
 246
 247         ITITERATE(i, dtwalk) {
 248                 dumprecout(df, dtwalk);
 249         }
 250         if (fflush(df))
 251                 quit("%s: %s\n", dumpdates, strerror(errno));
 252         if (ftruncate(fd, ftell(df)))
 253                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 254         (void) fclose(df);
 255         msg("level %c dump on %s", level,
 256 #ifdef  __linux__
 257                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 258 #else
 259                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 260 #endif
 261 }
 262
 263 static void
 264 dumprecout(FILE *file, struct dumpdates *what)
 265 {
 266
 267         if (fprintf(file, "%s %c %s",
 268                     what->dd_name,
 269                     what->dd_level,
 270                     ctime(&what->dd_ddate)) < 0)
 271                 quit("%s: %s\n", dumpdates, strerror(errno));
 272 }
 273
 274 int     recno;
 275
 276 static int
 277 getrecord(FILE *df, struct dumpdates *ddatep)
 278 {
 279         char tbuf[BUFSIZ];
 280
 281         recno = 0;
 282         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 283                 return(-1);
 284         recno++;
 285         if (makedumpdate(ddatep, tbuf) < 0)
 286                 msg("Unknown intermediate format in %s, line %d\n",
 287                         dumpdates, recno);
 288
 289 #ifdef FDEBUG
 290         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 291             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 292 #endif
 293         return(0);
 294 }
 295
 296 static int
 297 makedumpdate(struct dumpdates *ddp, char *tbuf)
 298 {
 299         char *tok;
 300
 301         /* device name */
 302         if ( NULL == (tok = strsep( &tbuf, " ")) )
 303                 return(-1);
 304         if ( strlen(tok) >  MAXPATHLEN )
 305                 return(-1);
 306         strcpy(ddp->dd_name, tok);
 307
 308         /* eat whitespace */
 309         for( ; *tbuf == ' ' ; tbuf++);
 310
 311         /* dump level */
 312         ddp->dd_level = *tbuf;
 313         ++tbuf;
 314
 315         /* eat whitespace */
 316         for( ; *tbuf == ' ' ; tbuf++);
 317
 318         /* dump date */
 319         ddp->dd_ddate = unctime(tbuf);
 320         if (ddp->dd_ddate < 0)
 321                 return(-1);
 322         /* fstab entry */
 323         ddp->dd_fstab = fstabsearch(ddp->dd_name);
 324         return(0);
 325 }