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 <stelian@popies.net>, 1999-2000
   6  *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
   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 1.22 2002/01/25 15:08:59 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 #include <time.h>
  59 #ifdef  __linux__
  60 #ifdef HAVE_EXT2FS_EXT2_FS_H
  61 #include <ext2fs/ext2_fs.h>
  62 #else
  63 #include <linux/ext2_fs.h>
  64 #endif
  65 #include <ext2fs/ext2fs.h>
  66 #include <bsdcompat.h>
  67 #include <sys/file.h>
  68 #include <unistd.h>
  69 #elif defined sunos
  70 #include <sys/vnode.h>
  71
  72 #include <ufs/fsdir.h>
  73 #include <ufs/inode.h>
  74 #include <ufs/fs.h>
  75 #else
  76 #include <ufs/ufs/dinode.h>
  77 #endif
  78
  79 #include <protocols/dumprestore.h>
  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         int i;
 135         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         struct dumpdates *ddp;
 162         int i;
 163
 164 #ifdef FDEBUG
 165         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 166                 disk, 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(disk, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 186                         continue;
 187                 if (ddp->dd_level >= level)
 188                         continue;
 189                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 190                         continue;
 191                 spcl.c_ddate = ddp->dd_ddate;
 192                 lastlevel = ddp->dd_level;
 193         }
 194 }
 195
 196 void
 197 putdumptime(void)
 198 {
 199         FILE *df;
 200         struct dumpdates *dtwalk;
 201         int i;
 202         int fd;
 203
 204         if(uflag == 0)
 205                 return;
 206         if ((df = fopen(dumpdates, "r+")) == NULL)
 207                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 208         fd = fileno(df);
 209         (void) flock(fd, LOCK_EX);
 210         free((char *)ddatev);
 211         ddatev = 0;
 212         nddates = 0;
 213         dthead = 0;
 214         ddates_in = 0;
 215         readdumptimes(df);
 216         if (fseek(df, 0L, 0) < 0)
 217                 quit("fseek: %s\n", strerror(errno));
 218         spcl.c_ddate = 0;
 219         ITITERATE(i, dtwalk) {
 220                 if (strncmp(disk, dtwalk->dd_name,
 221                                 sizeof (dtwalk->dd_name)) != 0)
 222                         continue;
 223                 if (dtwalk->dd_level != level)
 224                         continue;
 225                 goto found;
 226         }
 227         /*
 228          *      construct the new upper bound;
 229          *      Enough room has been allocated.
 230          */
 231         dtwalk = ddatev[nddates] =
 232                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 233         nddates += 1;
 234   found:
 235         (void) strncpy(dtwalk->dd_name, disk, sizeof (dtwalk->dd_name));
 236         dtwalk->dd_level = level;
 237         dtwalk->dd_ddate = spcl.c_date;
 238
 239         ITITERATE(i, dtwalk) {
 240                 dumprecout(df, dtwalk);
 241         }
 242         if (fflush(df))
 243                 quit("%s: %s\n", dumpdates, strerror(errno));
 244         if (ftruncate(fd, ftell(df)))
 245                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 246         (void) fclose(df);
 247 }
 248
 249 static void
 250 dumprecout(FILE *file, struct dumpdates *what)
 251 {
 252
 253         if (fprintf(file, "%s %c %s",
 254                     what->dd_name,
 255                     what->dd_level,
 256                     ctime(&what->dd_ddate)) < 0)
 257                 quit("%s: %s\n", dumpdates, strerror(errno));
 258 }
 259
 260 int     recno;
 261
 262 static int
 263 getrecord(FILE *df, struct dumpdates *ddatep)
 264 {
 265         char tbuf[BUFSIZ];
 266
 267         recno = 0;
 268         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 269                 return(-1);
 270         recno++;
 271         if (makedumpdate(ddatep, tbuf) < 0)
 272                 msg("Unknown intermediate format in %s, line %d\n",
 273                         dumpdates, recno);
 274
 275 #ifdef FDEBUG
 276         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 277             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 278 #endif
 279         return(0);
 280 }
 281
 282 static int
 283 makedumpdate(struct dumpdates *ddp, char *tbuf)
 284 {
 285         char *tok;
 286
 287         /* device name */
 288         if ( NULL == (tok = strsep( &tbuf, " ")) )
 289                 return(-1);
 290         if ( strlen(tok) >  MAXPATHLEN )
 291                 return(-1);
 292         strcpy(ddp->dd_name, tok);
 293
 294         /* eat whitespace */
 295         for( ; *tbuf == ' ' ; tbuf++);
 296
 297         /* dump level */
 298         ddp->dd_level = *tbuf;
 299         ++tbuf;
 300
 301         /* eat whitespace */
 302         for( ; *tbuf == ' ' ; tbuf++);
 303
 304         /* dump date */
 305         ddp->dd_ddate = unctime(tbuf);
 306         if (ddp->dd_ddate < 0)
 307                 return(-1);
 308         /* fstab entry */
 309         ddp->dd_fstab = fstabsearch(ddp->dd_name);
 310         return(0);
 311 }