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 1.18 2001/03/21 09:37:13 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <config.h>
  48 #include <errno.h>
  49 #include <fcntl.h>
  50 #include <stdio.h>
  51 #ifdef __STDC__
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #endif
  55
  56 #include <sys/param.h>
  57 #include <sys/time.h>
  58 #ifdef  __linux__
  59 #include <linux/ext2_fs.h>
  60 #include <ext2fs/ext2fs.h>
  61 #include <time.h>
  62 #include <bsdcompat.h>
  63 #include <sys/file.h>
  64 #include <unistd.h>
  65 #elif defined sunos
  66 #include <sys/vnode.h>
  67
  68 #include <ufs/fsdir.h>
  69 #include <ufs/inode.h>
  70 #include <ufs/fs.h>
  71 #else
  72 #include <ufs/ufs/dinode.h>
  73 #endif
  74
  75 #include <protocols/dumprestore.h>
  76
  77 #include "dump.h"
  78
  79 struct  dumpdates **ddatev;
  80 int     nddates;
  81 int     ddates_in;
  82 struct  dumptime *dthead;
  83
  84 static  void dumprecout __P((FILE *, struct dumpdates *));
  85 static  int getrecord __P((FILE *, struct dumpdates *));
  86 static  int makedumpdate __P((struct dumpdates *, char *));
  87 static  void readdumptimes __P((FILE *));
  88
  89 void
  90 initdumptimes(int createdumpdates)
  91 {
  92         FILE *df;
  93
  94         if ((df = fopen(dumpdates, "r")) == NULL) {
  95                 if (errno != ENOENT) {
  96                         quit("cannot read %s: %s\n", dumpdates,
  97                             strerror(errno));
  98                         /* NOTREACHED */
  99                 }
 100                 if (createdumpdates) {
 101                         /*
 102                          * Dumpdates does not exist, make an empty one.
 103                          */
 104                         msg("WARNING: no file `%s', making an empty one\n", dumpdates);
 105                         if ((df = fopen(dumpdates, "w")) == NULL) {
 106                                 quit("cannot create %s: %s\n", dumpdates,
 107                                 strerror(errno));
 108                                 /* NOTREACHED */
 109                         }
 110                         (void) fclose(df);
 111                         if ((df = fopen(dumpdates, "r")) == NULL) {
 112                                 quit("cannot read %s even after creating it: %s\n",
 113                                 dumpdates, strerror(errno));
 114                                 /* NOTREACHED */
 115                         }
 116                 }
 117                 else
 118                         msg("WARNING: no file `%s'\n", dumpdates);
 119         }
 120         if (df != NULL) {
 121                 (void) flock(fileno(df), LOCK_SH);
 122                 readdumptimes(df);
 123                 (void) fclose(df);
 124         }
 125 }
 126
 127 static void
 128 readdumptimes(FILE *df)
 129 {
 130         register int i;
 131         register struct dumptime *dtwalk;
 132
 133         for (;;) {
 134                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 135                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 136                         break;
 137                 nddates++;
 138                 dtwalk->dt_next = dthead;
 139                 dthead = dtwalk;
 140         }
 141
 142         ddates_in = 1;
 143         /*
 144          *      arrayify the list, leaving enough room for the additional
 145          *      record that we may have to add to the ddate structure
 146          */
 147         ddatev = (struct dumpdates **)
 148                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 149         dtwalk = dthead;
 150         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 151                 ddatev[i] = &dtwalk->dt_value;
 152 }
 153
 154 void
 155 getdumptime(int createdumpdates)
 156 {
 157         register struct dumpdates *ddp;
 158         register int i;
 159
 160 #ifdef FDEBUG
 161         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 162                 disk, dumpdates, level);
 163 #endif
 164         spcl.c_ddate = 0;
 165         lastlevel = '0';
 166
 167         /* If this is a level 0 dump, and we're not updating
 168            dumpdates, there's no point in trying to read
 169            dumpdates.  It may not exist yet, or may not be mounted.  For
 170            incrementals, we *must* read dumpdates (fail if it's not there!) */
 171         if ( (level == lastlevel) && !createdumpdates)
 172                 return;
 173         initdumptimes(createdumpdates);
 174         if (ddatev == NULL)
 175                 return;
 176         /*
 177          *      Go find the entry with the same name for a lower increment
 178          *      and older date
 179          */
 180         ITITERATE(i, ddp) {
 181                 if (strncmp(disk, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 182                         continue;
 183                 if (ddp->dd_level >= level)
 184                         continue;
 185                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 186                         continue;
 187                 spcl.c_ddate = ddp->dd_ddate;
 188                 lastlevel = ddp->dd_level;
 189         }
 190 }
 191
 192 void
 193 putdumptime(void)
 194 {
 195         FILE *df;
 196         register struct dumpdates *dtwalk;
 197         register int i;
 198         int fd;
 199
 200         if(uflag == 0)
 201                 return;
 202         if ((df = fopen(dumpdates, "r+")) == NULL)
 203                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 204         fd = fileno(df);
 205         (void) flock(fd, LOCK_EX);
 206         free((char *)ddatev);
 207         ddatev = 0;
 208         nddates = 0;
 209         dthead = 0;
 210         ddates_in = 0;
 211         readdumptimes(df);
 212         if (fseek(df, 0L, 0) < 0)
 213                 quit("fseek: %s\n", strerror(errno));
 214         spcl.c_ddate = 0;
 215         ITITERATE(i, dtwalk) {
 216                 if (strncmp(disk, dtwalk->dd_name,
 217                                 sizeof (dtwalk->dd_name)) != 0)
 218                         continue;
 219                 if (dtwalk->dd_level != level)
 220                         continue;
 221                 goto found;
 222         }
 223         /*
 224          *      construct the new upper bound;
 225          *      Enough room has been allocated.
 226          */
 227         dtwalk = ddatev[nddates] =
 228                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 229         nddates += 1;
 230   found:
 231         (void) strncpy(dtwalk->dd_name, disk, sizeof (dtwalk->dd_name));
 232         dtwalk->dd_level = level;
 233         dtwalk->dd_ddate = spcl.c_date;
 234
 235         ITITERATE(i, dtwalk) {
 236                 dumprecout(df, dtwalk);
 237         }
 238         if (fflush(df))
 239                 quit("%s: %s\n", dumpdates, strerror(errno));
 240         if (ftruncate(fd, ftell(df)))
 241                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 242         (void) fclose(df);
 243 }
 244
 245 static void
 246 dumprecout(FILE *file, struct dumpdates *what)
 247 {
 248
 249         if (fprintf(file, "%s %c %s",
 250                     what->dd_name,
 251                     what->dd_level,
 252                     ctime(&what->dd_ddate)) < 0)
 253                 quit("%s: %s\n", dumpdates, strerror(errno));
 254 }
 255
 256 int     recno;
 257
 258 static int
 259 getrecord(FILE *df, struct dumpdates *ddatep)
 260 {
 261         char tbuf[BUFSIZ];
 262
 263         recno = 0;
 264         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 265                 return(-1);
 266         recno++;
 267         if (makedumpdate(ddatep, tbuf) < 0)
 268                 msg("Unknown intermediate format in %s, line %d\n",
 269                         dumpdates, recno);
 270
 271 #ifdef FDEBUG
 272         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 273             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 274 #endif
 275         return(0);
 276 }
 277
 278 static int
 279 makedumpdate(struct dumpdates *ddp, char *tbuf)
 280 {
 281         char *tok;
 282
 283         /* device name */
 284         if ( NULL == (tok = strsep( &tbuf, " ")) )
 285                 return(-1);
 286         if ( strlen(tok) >  MAXPATHLEN )
 287                 return(-1);
 288         strcpy(ddp->dd_name, tok);
 289
 290         /* eat whitespace */
 291         for( ; *tbuf == ' ' ; tbuf++);
 292
 293         /* dump level */
 294         ddp->dd_level = *tbuf;
 295         ++tbuf;
 296
 297         /* eat whitespace */
 298         for( ; *tbuf == ' ' ; tbuf++);
 299
 300         /* dump date */
 301         ddp->dd_ddate = unctime(tbuf);
 302         if (ddp->dd_ddate < 0)
 303                 return(-1);
 304         /* fstab entry */
 305         ddp->dd_fstab = fstabsearch(ddp->dd_name);
 306         return(0);
 307 }