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 1.13 2000/12/04 15:43:16 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <sys/param.h>
  48 #include <sys/time.h>
  49 #ifdef  __linux__
  50 #include <linux/ext2_fs.h>
  51 #include <bsdcompat.h>
  52 #include <sys/file.h>
  53 #include <unistd.h>
  54 #else
  55 #ifdef sunos
  56 #include <sys/vnode.h>
  57
  58 #include <ufs/fsdir.h>
  59 #include <ufs/inode.h>
  60 #include <ufs/fs.h>
  61 #else
  62 #include <ufs/ufs/dinode.h>
  63 #endif
  64 #endif
  65
  66 #include <protocols/dumprestore.h>
  67
  68 #include <errno.h>
  69 #include <fcntl.h>
  70 #include <stdio.h>
  71 #ifdef __STDC__
  72 #include <stdlib.h>
  73 #include <string.h>
  74 #endif
  75
  76 #ifdef  __linux__
  77 #include <ext2fs/ext2fs.h>
  78 #endif
  79
  80 #include "dump.h"
  81
  82 struct  dumpdates **ddatev;
  83 int     nddates;
  84 int     ddates_in;
  85 struct  dumptime *dthead;
  86
  87 static  void dumprecout __P((FILE *, struct dumpdates *));
  88 static  int getrecord __P((FILE *, struct dumpdates *));
  89 static  int makedumpdate __P((struct dumpdates *, char *));
  90 static  void readdumptimes __P((FILE *));
  91
  92 void
  93 initdumptimes(int createdumpdates)
  94 {
  95         FILE *df;
  96
  97         if ((df = fopen(dumpdates, "r")) == NULL) {
  98                 if (errno != ENOENT) {
  99                         quit("cannot read %s: %s\n", dumpdates,
 100                             strerror(errno));
 101                         /* NOTREACHED */
 102                 }
 103                 if (createdumpdates) {
 104                         /*
 105                          * Dumpdates does not exist, make an empty one.
 106                          */
 107                         msg("WARNING: no file `%s', making an empty one\n", dumpdates);
 108                         if ((df = fopen(dumpdates, "w")) == NULL) {
 109                                 quit("cannot create %s: %s\n", dumpdates,
 110                                 strerror(errno));
 111                                 /* NOTREACHED */
 112                         }
 113                         (void) fclose(df);
 114                         if ((df = fopen(dumpdates, "r")) == NULL) {
 115                                 quit("cannot read %s even after creating it: %s\n",
 116                                 dumpdates, strerror(errno));
 117                                 /* NOTREACHED */
 118                         }
 119                 }
 120                 else
 121                         msg("WARNING: no file `%s'\n", dumpdates);
 122         }
 123         if (df != NULL) {
 124                 (void) flock(fileno(df), LOCK_SH);
 125                 readdumptimes(df);
 126                 (void) fclose(df);
 127         }
 128 }
 129
 130 static void
 131 readdumptimes(FILE *df)
 132 {
 133         register int i;
 134         register struct dumptime *dtwalk;
 135
 136         for (;;) {
 137                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 138                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 139                         break;
 140                 nddates++;
 141                 dtwalk->dt_next = dthead;
 142                 dthead = dtwalk;
 143         }
 144
 145         ddates_in = 1;
 146         /*
 147          *      arrayify the list, leaving enough room for the additional
 148          *      record that we may have to add to the ddate structure
 149          */
 150         ddatev = (struct dumpdates **)
 151                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 152         dtwalk = dthead;
 153         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 154                 ddatev[i] = &dtwalk->dt_value;
 155 }
 156
 157 void
 158 getdumptime(int createdumpdates)
 159 {
 160         register struct dumpdates *ddp;
 161         register int i;
 162         char *fname;
 163
 164         fname = disk;
 165 #ifdef FDEBUG
 166         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 167                 fname, dumpdates, level);
 168 #endif
 169         spcl.c_ddate = 0;
 170         lastlevel = '0';
 171
 172         /* If this is a level 0 dump, and we're not updating
 173            dumpdates, there's no point in trying to read
 174            dumpdates.  It may not exist yet, or may not be mounted.  For
 175            incrementals, we *must* read dumpdates (fail if it's not there!) */
 176         if ( (level == lastlevel) && !createdumpdates)
 177                 return;
 178         initdumptimes(createdumpdates);
 179         if (ddatev == NULL)
 180                 return;
 181         /*
 182          *      Go find the entry with the same name for a lower increment
 183          *      and older date
 184          */
 185         ITITERATE(i, ddp) {
 186                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 187                         continue;
 188                 if (ddp->dd_level >= level)
 189                         continue;
 190 #ifdef  __linux__
 191                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 192 #else
 193                 if (ddp->dd_ddate <= spcl.c_ddate)
 194 #endif
 195                         continue;
 196                 spcl.c_ddate = ddp->dd_ddate;
 197                 lastlevel = ddp->dd_level;
 198         }
 199 }
 200
 201 void
 202 putdumptime(void)
 203 {
 204         FILE *df;
 205         register struct dumpdates *dtwalk;
 206         register int i;
 207         int fd;
 208         char *fname;
 209
 210         if(uflag == 0)
 211                 return;
 212         if ((df = fopen(dumpdates, "r+")) == NULL)
 213                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 214         fd = fileno(df);
 215         (void) flock(fd, LOCK_EX);
 216         fname = disk;
 217         free((char *)ddatev);
 218         ddatev = 0;
 219         nddates = 0;
 220         dthead = 0;
 221         ddates_in = 0;
 222         readdumptimes(df);
 223         if (fseek(df, 0L, 0) < 0)
 224                 quit("fseek: %s\n", strerror(errno));
 225         spcl.c_ddate = 0;
 226         ITITERATE(i, dtwalk) {
 227                 if (strncmp(fname, dtwalk->dd_name,
 228                                 sizeof (dtwalk->dd_name)) != 0)
 229                         continue;
 230                 if (dtwalk->dd_level != level)
 231                         continue;
 232                 goto found;
 233         }
 234         /*
 235          *      construct the new upper bound;
 236          *      Enough room has been allocated.
 237          */
 238         dtwalk = ddatev[nddates] =
 239                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 240         nddates += 1;
 241   found:
 242         (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 243         dtwalk->dd_level = level;
 244         dtwalk->dd_ddate = spcl.c_date;
 245
 246         ITITERATE(i, dtwalk) {
 247                 dumprecout(df, dtwalk);
 248         }
 249         if (fflush(df))
 250                 quit("%s: %s\n", dumpdates, strerror(errno));
 251         if (ftruncate(fd, ftell(df)))
 252                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 253         (void) fclose(df);
 254         msg("level %c dump on %s", level,
 255 #ifdef  __linux__
 256                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 257 #else
 258                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 259 #endif
 260 }
 261
 262 static void
 263 dumprecout(FILE *file, struct dumpdates *what)
 264 {
 265
 266         if (fprintf(file, "%s %c %s",
 267                     what->dd_name,
 268                     what->dd_level,
 269                     ctime(&what->dd_ddate)) < 0)
 270                 quit("%s: %s\n", dumpdates, strerror(errno));
 271 }
 272
 273 int     recno;
 274
 275 static int
 276 getrecord(FILE *df, struct dumpdates *ddatep)
 277 {
 278         char tbuf[BUFSIZ];
 279
 280         recno = 0;
 281         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 282                 return(-1);
 283         recno++;
 284         if (makedumpdate(ddatep, tbuf) < 0)
 285                 msg("Unknown intermediate format in %s, line %d\n",
 286                         dumpdates, recno);
 287
 288 #ifdef FDEBUG
 289         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 290             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 291 #endif
 292         return(0);
 293 }
 294
 295 static int
 296 makedumpdate(struct dumpdates *ddp, char *tbuf)
 297 {
 298         char *tok;
 299
 300         /* device name */
 301         if ( NULL == (tok = strsep( &tbuf, " ")) )
 302                 return(-1);
 303         if ( strlen(tok) >  MAXPATHLEN )
 304                 return(-1);
 305         strcpy(ddp->dd_name, tok);
 306
 307         /* eat whitespace */
 308         for( ; *tbuf == ' ' ; tbuf++);
 309
 310         /* dump level */
 311         ddp->dd_level = *tbuf;
 312         ++tbuf;
 313
 314         /* eat whitespace */
 315         for( ; *tbuf == ' ' ; tbuf++);
 316
 317         /* dump date */
 318         ddp->dd_ddate = unctime(tbuf);
 319         if (ddp->dd_ddate < 0)
 320                 return(-1);
 321         /* fstab entry */
 322         ddp->dd_fstab = fstabsearch(ddp->dd_name);
 323         return(0);
 324 }