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
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)itime.c     8.1 (Berkeley) 6/5/93";
  45 #endif
  46 static const char rcsid[] =
  47         "$Id: itime.c,v 1.2 1999/10/11 12:53:22 stelian Exp $";
  48 #endif /* not lint */
  49
  50 #include <sys/param.h>
  51 #include <sys/time.h>
  52 #ifdef  __linux__
  53 #include <linux/ext2_fs.h>
  54 #include <bsdcompat.h>
  55 #include <sys/file.h>
  56 #include <unistd.h>
  57 #else
  58 #ifdef sunos
  59 #include <sys/vnode.h>
  60
  61 #include <ufs/fsdir.h>
  62 #include <ufs/inode.h>
  63 #include <ufs/fs.h>
  64 #else
  65 #include <ufs/ufs/dinode.h>
  66 #endif
  67 #endif
  68
  69 #include <protocols/dumprestore.h>
  70
  71 #include <errno.h>
  72 #include <fcntl.h>
  73 #include <stdio.h>
  74 #ifdef __STDC__
  75 #include <stdlib.h>
  76 #include <string.h>
  77 #endif
  78
  79 #ifdef  __linux__
  80 #include <ext2fs/ext2fs.h>
  81 #endif
  82
  83 #include "dump.h"
  84
  85 struct  dumpdates **ddatev = 0;
  86 int     nddates = 0;
  87 int     ddates_in = 0;
  88 struct  dumptime *dthead = 0;
  89
  90 static  void dumprecout __P((FILE *, struct dumpdates *));
  91 static  int getrecord __P((FILE *, struct dumpdates *));
  92 static  int makedumpdate __P((struct dumpdates *, char *));
  93 static  void readdumptimes __P((FILE *));
  94
  95 void
  96 initdumptimes()
  97 {
  98         FILE *df;
  99
 100         if ((df = fopen(dumpdates, "r")) == NULL) {
 101                 if (errno != ENOENT) {
 102                         quit("cannot read %s: %s\n", dumpdates,
 103                             strerror(errno));
 104                         /* NOTREACHED */
 105                 }
 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         (void) flock(fileno(df), LOCK_SH);
 123         readdumptimes(df);
 124         (void) fclose(df);
 125 }
 126
 127 static void
 128 readdumptimes(df)
 129         FILE *df;
 130 {
 131         register int i;
 132         register struct dumptime *dtwalk;
 133
 134         for (;;) {
 135                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 136                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 137                         break;
 138                 nddates++;
 139                 dtwalk->dt_next = dthead;
 140                 dthead = dtwalk;
 141         }
 142
 143         ddates_in = 1;
 144         /*
 145          *      arrayify the list, leaving enough room for the additional
 146          *      record that we may have to add to the ddate structure
 147          */
 148         ddatev = (struct dumpdates **)
 149                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 150         dtwalk = dthead;
 151         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 152                 ddatev[i] = &dtwalk->dt_value;
 153 }
 154
 155 void
 156 getdumptime()
 157 {
 158         register struct dumpdates *ddp;
 159         register int i;
 160         char *fname;
 161
 162         fname = disk;
 163 #ifdef FDEBUG
 164         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 165                 fname, dumpdates, level);
 166 #endif
 167         spcl.c_ddate = 0;
 168         lastlevel = '0';
 169
 170         initdumptimes();
 171         /*
 172          *      Go find the entry with the same name for a lower increment
 173          *      and older date
 174          */
 175         ITITERATE(i, ddp) {
 176                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 177                         continue;
 178                 if (ddp->dd_level >= level)
 179                         continue;
 180 #ifdef  __linux__
 181                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 182 #else
 183                 if (ddp->dd_ddate <= spcl.c_ddate)
 184 #endif
 185                         continue;
 186                 spcl.c_ddate = ddp->dd_ddate;
 187                 lastlevel = ddp->dd_level;
 188         }
 189 }
 190
 191 void
 192 putdumptime()
 193 {
 194         FILE *df;
 195         register struct dumpdates *dtwalk;
 196         register int i;
 197         int fd;
 198         char *fname;
 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         fname = disk;
 207         free((char *)ddatev);
 208         ddatev = 0;
 209         nddates = 0;
 210         dthead = 0;
 211         ddates_in = 0;
 212         readdumptimes(df);
 213         if (fseek(df, 0L, 0) < 0)
 214                 quit("fseek: %s\n", strerror(errno));
 215         spcl.c_ddate = 0;
 216         ITITERATE(i, dtwalk) {
 217                 if (strncmp(fname, dtwalk->dd_name,
 218                                 sizeof (dtwalk->dd_name)) != 0)
 219                         continue;
 220                 if (dtwalk->dd_level != level)
 221                         continue;
 222                 goto found;
 223         }
 224         /*
 225          *      construct the new upper bound;
 226          *      Enough room has been allocated.
 227          */
 228         dtwalk = ddatev[nddates] =
 229                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 230         nddates += 1;
 231   found:
 232         (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 233         dtwalk->dd_level = level;
 234         dtwalk->dd_ddate = spcl.c_date;
 235
 236         ITITERATE(i, dtwalk) {
 237                 dumprecout(df, dtwalk);
 238         }
 239         if (fflush(df))
 240                 quit("%s: %s\n", dumpdates, strerror(errno));
 241         if (ftruncate(fd, ftell(df)))
 242                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 243         (void) fclose(df);
 244         msg("level %c dump on %s", level,
 245 #ifdef  __linux__
 246                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 247 #else
 248                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 249 #endif
 250 }
 251
 252 static void
 253 dumprecout(file, what)
 254         FILE *file;
 255         struct dumpdates *what;
 256 {
 257
 258         if (fprintf(file, DUMPOUTFMT,
 259                     what->dd_name,
 260                     what->dd_level,
 261                     ctime(&what->dd_ddate)) < 0)
 262                 quit("%s: %s\n", dumpdates, strerror(errno));
 263 }
 264
 265 int     recno;
 266
 267 static int
 268 getrecord(df, ddatep)
 269         FILE *df;
 270         struct dumpdates *ddatep;
 271 {
 272         char tbuf[BUFSIZ];
 273
 274         recno = 0;
 275         if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf)
 276                 return(-1);
 277         recno++;
 278         if (makedumpdate(ddatep, tbuf) < 0)
 279                 msg("Unknown intermediate format in %s, line %d\n",
 280                         dumpdates, recno);
 281
 282 #ifdef FDEBUG
 283         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 284             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 285 #endif
 286         return(0);
 287 }
 288
 289 static int
 290 makedumpdate(ddp, tbuf)
 291         struct dumpdates *ddp;
 292         char *tbuf;
 293 {
 294         char un_buf[128];
 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 }