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@cybercable.fr>, 1999
   6  *
   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  * $Id: itime.c,v 1.5 1999/10/11 13:31:11 stelian Exp $
  42  */
  43
  44 #include <sys/param.h>
  45 #include <sys/time.h>
  46 #ifdef  __linux__
  47 #include <linux/ext2_fs.h>
  48 #include <bsdcompat.h>
  49 #include <sys/file.h>
  50 #include <unistd.h>
  51 #else
  52 #ifdef sunos
  53 #include <sys/vnode.h>
  54
  55 #include <ufs/fsdir.h>
  56 #include <ufs/inode.h>
  57 #include <ufs/fs.h>
  58 #else
  59 #include <ufs/ufs/dinode.h>
  60 #endif
  61 #endif
  62
  63 #include <protocols/dumprestore.h>
  64
  65 #include <errno.h>
  66 #include <fcntl.h>
  67 #include <stdio.h>
  68 #ifdef __STDC__
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #endif
  72
  73 #ifdef  __linux__
  74 #include <ext2fs/ext2fs.h>
  75 #endif
  76
  77 #include "dump.h"
  78
  79 struct  dumpdates **ddatev = 0;
  80 int     nddates = 0;
  81 int     ddates_in = 0;
  82 struct  dumptime *dthead = 0;
  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         char *fname;
 160
 161         fname = disk;
 162 #ifdef FDEBUG
 163         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 164                 fname, dumpdates, level);
 165 #endif
 166         spcl.c_ddate = 0;
 167         lastlevel = '0';
 168
 169         /* if we're not going to update dumpdates, there's no point in reading
 170            it, particularly since /var might not be mounted... wait until here
 171            to benefit from the initialization of variables needed by parent */
 172         if (!uflag && level == lastlevel)
 173                 return;
 174         initdumptimes(createdumpdates);
 175         if (ddatev == NULL)
 176                 return;
 177         /*
 178          *      Go find the entry with the same name for a lower increment
 179          *      and older date
 180          */
 181         ITITERATE(i, ddp) {
 182                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 183                         continue;
 184                 if (ddp->dd_level >= level)
 185                         continue;
 186 #ifdef  __linux__
 187                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 188 #else
 189                 if (ddp->dd_ddate <= spcl.c_ddate)
 190 #endif
 191                         continue;
 192                 spcl.c_ddate = ddp->dd_ddate;
 193                 lastlevel = ddp->dd_level;
 194         }
 195 }
 196
 197 void
 198 putdumptime(void)
 199 {
 200         FILE *df;
 201         register struct dumpdates *dtwalk;
 202         register int i;
 203         int fd;
 204         char *fname;
 205
 206         if(uflag == 0)
 207                 return;
 208         if ((df = fopen(dumpdates, "r+")) == NULL)
 209                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 210         fd = fileno(df);
 211         (void) flock(fd, LOCK_EX);
 212         fname = disk;
 213         free((char *)ddatev);
 214         ddatev = 0;
 215         nddates = 0;
 216         dthead = 0;
 217         ddates_in = 0;
 218         readdumptimes(df);
 219         if (fseek(df, 0L, 0) < 0)
 220                 quit("fseek: %s\n", strerror(errno));
 221         spcl.c_ddate = 0;
 222         ITITERATE(i, dtwalk) {
 223                 if (strncmp(fname, dtwalk->dd_name,
 224                                 sizeof (dtwalk->dd_name)) != 0)
 225                         continue;
 226                 if (dtwalk->dd_level != level)
 227                         continue;
 228                 goto found;
 229         }
 230         /*
 231          *      construct the new upper bound;
 232          *      Enough room has been allocated.
 233          */
 234         dtwalk = ddatev[nddates] =
 235                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 236         nddates += 1;
 237   found:
 238         (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 239         dtwalk->dd_level = level;
 240         dtwalk->dd_ddate = spcl.c_date;
 241
 242         ITITERATE(i, dtwalk) {
 243                 dumprecout(df, dtwalk);
 244         }
 245         if (fflush(df))
 246                 quit("%s: %s\n", dumpdates, strerror(errno));
 247         if (ftruncate(fd, ftell(df)))
 248                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 249         (void) fclose(df);
 250         msg("level %c dump on %s", level,
 251 #ifdef  __linux__
 252                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 253 #else
 254                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 255 #endif
 256 }
 257
 258 static void
 259 dumprecout(FILE *file, struct dumpdates *what)
 260 {
 261
 262         if (fprintf(file, DUMPOUTFMT,
 263                     what->dd_name,
 264                     what->dd_level,
 265                     ctime(&what->dd_ddate)) < 0)
 266                 quit("%s: %s\n", dumpdates, strerror(errno));
 267 }
 268
 269 int     recno;
 270
 271 static int
 272 getrecord(FILE *df, struct dumpdates *ddatep)
 273 {
 274         char tbuf[BUFSIZ];
 275
 276         recno = 0;
 277         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 278                 return(-1);
 279         recno++;
 280         if (makedumpdate(ddatep, tbuf) < 0)
 281                 msg("Unknown intermediate format in %s, line %d\n",
 282                         dumpdates, recno);
 283
 284 #ifdef FDEBUG
 285         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 286             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 287 #endif
 288         return(0);
 289 }
 290
 291 static int
 292 makedumpdate(struct dumpdates *ddp, char *tbuf)
 293 {
 294         char un_buf[BUFSIZ];
 295
 296         (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 297         ddp->dd_ddate = unctime(un_buf);
 298         if (ddp->dd_ddate < 0)
 299                 return(-1);
 300         return(0);
 301 }