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 1.15 2001/02/22 10:57:40 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 <time.h>
  53 #include <bsdcompat.h>
  54 #include <sys/file.h>
  55 #include <unistd.h>
  56 #else
  57 #ifdef sunos
  58 #include <sys/vnode.h>
  59
  60 #include <ufs/fsdir.h>
  61 #include <ufs/inode.h>
  62 #include <ufs/fs.h>
  63 #else
  64 #include <ufs/ufs/dinode.h>
  65 #endif
  66 #endif
  67
  68 #include <protocols/dumprestore.h>
  69
  70 #include <errno.h>
  71 #include <fcntl.h>
  72 #include <stdio.h>
  73 #ifdef __STDC__
  74 #include <stdlib.h>
  75 #include <string.h>
  76 #endif
  77
  78 #ifdef  __linux__
  79 #include <ext2fs/ext2fs.h>
  80 #endif
  81
  82 #include "dump.h"
  83
  84 struct  dumpdates **ddatev;
  85 int     nddates;
  86 int     ddates_in;
  87 struct  dumptime *dthead;
  88
  89 static  void dumprecout __P((FILE *, struct dumpdates *));
  90 static  int getrecord __P((FILE *, struct dumpdates *));
  91 static  int makedumpdate __P((struct dumpdates *, char *));
  92 static  void readdumptimes __P((FILE *));
  93
  94 void
  95 initdumptimes(int createdumpdates)
  96 {
  97         FILE *df;
  98
  99         if ((df = fopen(dumpdates, "r")) == NULL) {
 100                 if (errno != ENOENT) {
 101                         quit("cannot read %s: %s\n", dumpdates,
 102                             strerror(errno));
 103                         /* NOTREACHED */
 104                 }
 105                 if (createdumpdates) {
 106                         /*
 107                          * Dumpdates does not exist, make an empty one.
 108                          */
 109                         msg("WARNING: no file `%s', making an empty one\n", dumpdates);
 110                         if ((df = fopen(dumpdates, "w")) == NULL) {
 111                                 quit("cannot create %s: %s\n", dumpdates,
 112                                 strerror(errno));
 113                                 /* NOTREACHED */
 114                         }
 115                         (void) fclose(df);
 116                         if ((df = fopen(dumpdates, "r")) == NULL) {
 117                                 quit("cannot read %s even after creating it: %s\n",
 118                                 dumpdates, strerror(errno));
 119                                 /* NOTREACHED */
 120                         }
 121                 }
 122                 else
 123                         msg("WARNING: no file `%s'\n", dumpdates);
 124         }
 125         if (df != NULL) {
 126                 (void) flock(fileno(df), LOCK_SH);
 127                 readdumptimes(df);
 128                 (void) fclose(df);
 129         }
 130 }
 131
 132 static void
 133 readdumptimes(FILE *df)
 134 {
 135         register int i;
 136         register struct dumptime *dtwalk;
 137
 138         for (;;) {
 139                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 140                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 141                         break;
 142                 nddates++;
 143                 dtwalk->dt_next = dthead;
 144                 dthead = dtwalk;
 145         }
 146
 147         ddates_in = 1;
 148         /*
 149          *      arrayify the list, leaving enough room for the additional
 150          *      record that we may have to add to the ddate structure
 151          */
 152         ddatev = (struct dumpdates **)
 153                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 154         dtwalk = dthead;
 155         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 156                 ddatev[i] = &dtwalk->dt_value;
 157 }
 158
 159 void
 160 getdumptime(int createdumpdates)
 161 {
 162         register struct dumpdates *ddp;
 163         register int i;
 164         char *fname;
 165
 166         fname = disk;
 167 #ifdef FDEBUG
 168         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 169                 fname, dumpdates, level);
 170 #endif
 171         spcl.c_ddate = 0;
 172         lastlevel = '0';
 173
 174         /* If this is a level 0 dump, and we're not updating
 175            dumpdates, there's no point in trying to read
 176            dumpdates.  It may not exist yet, or may not be mounted.  For
 177            incrementals, we *must* read dumpdates (fail if it's not there!) */
 178         if ( (level == lastlevel) && !createdumpdates)
 179                 return;
 180         initdumptimes(createdumpdates);
 181         if (ddatev == NULL)
 182                 return;
 183         /*
 184          *      Go find the entry with the same name for a lower increment
 185          *      and older date
 186          */
 187         ITITERATE(i, ddp) {
 188                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 189                         continue;
 190                 if (ddp->dd_level >= level)
 191                         continue;
 192 #ifdef  __linux__
 193                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 194 #else
 195                 if (ddp->dd_ddate <= spcl.c_ddate)
 196 #endif
 197                         continue;
 198                 spcl.c_ddate = ddp->dd_ddate;
 199                 lastlevel = ddp->dd_level;
 200         }
 201 }
 202
 203 void
 204 putdumptime(void)
 205 {
 206         FILE *df;
 207         register struct dumpdates *dtwalk;
 208         register int i;
 209         int fd;
 210         char *fname;
 211
 212         if(uflag == 0)
 213                 return;
 214         if ((df = fopen(dumpdates, "r+")) == NULL)
 215                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 216         fd = fileno(df);
 217         (void) flock(fd, LOCK_EX);
 218         fname = disk;
 219         free((char *)ddatev);
 220         ddatev = 0;
 221         nddates = 0;
 222         dthead = 0;
 223         ddates_in = 0;
 224         readdumptimes(df);
 225         if (fseek(df, 0L, 0) < 0)
 226                 quit("fseek: %s\n", strerror(errno));
 227         spcl.c_ddate = 0;
 228         ITITERATE(i, dtwalk) {
 229                 if (strncmp(fname, dtwalk->dd_name,
 230                                 sizeof (dtwalk->dd_name)) != 0)
 231                         continue;
 232                 if (dtwalk->dd_level != level)
 233                         continue;
 234                 goto found;
 235         }
 236         /*
 237          *      construct the new upper bound;
 238          *      Enough room has been allocated.
 239          */
 240         dtwalk = ddatev[nddates] =
 241                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 242         nddates += 1;
 243   found:
 244         (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 245         dtwalk->dd_level = level;
 246         dtwalk->dd_ddate = spcl.c_date;
 247
 248         ITITERATE(i, dtwalk) {
 249                 dumprecout(df, dtwalk);
 250         }
 251         if (fflush(df))
 252                 quit("%s: %s\n", dumpdates, strerror(errno));
 253         if (ftruncate(fd, ftell(df)))
 254                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 255         (void) fclose(df);
 256         msg("level %c dump on %s", level,
 257 #ifdef  __linux__
 258                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 259 #else
 260                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 261 #endif
 262 }
 263
 264 static void
 265 dumprecout(FILE *file, struct dumpdates *what)
 266 {
 267
 268         if (fprintf(file, "%s %c %s",
 269                     what->dd_name,
 270                     what->dd_level,
 271                     ctime(&what->dd_ddate)) < 0)
 272                 quit("%s: %s\n", dumpdates, strerror(errno));
 273 }
 274
 275 int     recno;
 276
 277 static int
 278 getrecord(FILE *df, struct dumpdates *ddatep)
 279 {
 280         char tbuf[BUFSIZ];
 281
 282         recno = 0;
 283         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 284                 return(-1);
 285         recno++;
 286         if (makedumpdate(ddatep, tbuf) < 0)
 287                 msg("Unknown intermediate format in %s, line %d\n",
 288                         dumpdates, recno);
 289
 290 #ifdef FDEBUG
 291         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 292             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 293 #endif
 294         return(0);
 295 }
 296
 297 static int
 298 makedumpdate(struct dumpdates *ddp, char *tbuf)
 299 {
 300         char *tok;
 301
 302         /* device name */
 303         if ( NULL == (tok = strsep( &tbuf, " ")) )
 304                 return(-1);
 305         if ( strlen(tok) >  MAXPATHLEN )
 306                 return(-1);
 307         strcpy(ddp->dd_name, tok);
 308
 309         /* eat whitespace */
 310         for( ; *tbuf == ' ' ; tbuf++);
 311
 312         /* dump level */
 313         ddp->dd_level = *tbuf;
 314         ++tbuf;
 315
 316         /* eat whitespace */
 317         for( ; *tbuf == ' ' ; tbuf++);
 318
 319         /* dump date */
 320         ddp->dd_ddate = unctime(tbuf);
 321         if (ddp->dd_ddate < 0)
 322                 return(-1);
 323         /* fstab entry */
 324         ddp->dd_fstab = fstabsearch(ddp->dd_name);
 325         return(0);
 326 }