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 1.3 1999/10/11 12:59:18 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(void)
  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(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(void)
 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 == 0)
 173                 return;
 174
 175         initdumptimes();
 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(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 182                         continue;
 183                 if (ddp->dd_level >= level)
 184                         continue;
 185 #ifdef  __linux__
 186                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 187 #else
 188                 if (ddp->dd_ddate <= spcl.c_ddate)
 189 #endif
 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         register struct dumpdates *dtwalk;
 201         register int i;
 202         int fd;
 203         char *fname;
 204
 205         if(uflag == 0)
 206                 return;
 207         if ((df = fopen(dumpdates, "r+")) == NULL)
 208                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 209         fd = fileno(df);
 210         (void) flock(fd, LOCK_EX);
 211         fname = disk;
 212         free((char *)ddatev);
 213         ddatev = 0;
 214         nddates = 0;
 215         dthead = 0;
 216         ddates_in = 0;
 217         readdumptimes(df);
 218         if (fseek(df, 0L, 0) < 0)
 219                 quit("fseek: %s\n", strerror(errno));
 220         spcl.c_ddate = 0;
 221         ITITERATE(i, dtwalk) {
 222                 if (strncmp(fname, dtwalk->dd_name,
 223                                 sizeof (dtwalk->dd_name)) != 0)
 224                         continue;
 225                 if (dtwalk->dd_level != level)
 226                         continue;
 227                 goto found;
 228         }
 229         /*
 230          *      construct the new upper bound;
 231          *      Enough room has been allocated.
 232          */
 233         dtwalk = ddatev[nddates] =
 234                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 235         nddates += 1;
 236   found:
 237         (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 238         dtwalk->dd_level = level;
 239         dtwalk->dd_ddate = spcl.c_date;
 240
 241         ITITERATE(i, dtwalk) {
 242                 dumprecout(df, dtwalk);
 243         }
 244         if (fflush(df))
 245                 quit("%s: %s\n", dumpdates, strerror(errno));
 246         if (ftruncate(fd, ftell(df)))
 247                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 248         (void) fclose(df);
 249         msg("level %c dump on %s", level,
 250 #ifdef  __linux__
 251                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 252 #else
 253                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 254 #endif
 255 }
 256
 257 static void
 258 dumprecout(FILE *file, struct dumpdates *what)
 259 {
 260
 261         if (fprintf(file, DUMPOUTFMT,
 262                     what->dd_name,
 263                     what->dd_level,
 264                     ctime(&what->dd_ddate)) < 0)
 265                 quit("%s: %s\n", dumpdates, strerror(errno));
 266 }
 267
 268 int     recno;
 269
 270 static int
 271 getrecord(FILE *df, struct dumpdates *ddatep)
 272 {
 273         char tbuf[BUFSIZ];
 274
 275         recno = 0;
 276         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 277                 return(-1);
 278         recno++;
 279         if (makedumpdate(ddatep, tbuf) < 0)
 280                 msg("Unknown intermediate format in %s, line %d\n",
 281                         dumpdates, recno);
 282
 283 #ifdef FDEBUG
 284         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 285             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 286 #endif
 287         return(0);
 288 }
 289
 290 static int
 291 makedumpdate(struct dumpdates *ddp, char *tbuf)
 292 {
 293         char un_buf[BUFSIZ];
 294
 295         (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 296         ddp->dd_ddate = unctime(un_buf);
 297         if (ddp->dd_ddate < 0)
 298                 return(-1);
 299         return(0);
 300 }