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 1.4 1999/10/11 13:08:07 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(int createdumpdates)
  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                 if (createdumpdates) {
 107                         /*
 108                          * Dumpdates does not exist, make an empty one.
 109                          */
 110                         msg("WARNING: no file `%s', making an empty one\n", dumpdates);
 111                         if ((df = fopen(dumpdates, "w")) == NULL) {
 112                                 quit("cannot create %s: %s\n", dumpdates,
 113                                 strerror(errno));
 114                                 /* NOTREACHED */
 115                         }
 116                         (void) fclose(df);
 117                         if ((df = fopen(dumpdates, "r")) == NULL) {
 118                                 quit("cannot read %s even after creating it: %s\n",
 119                                 dumpdates, strerror(errno));
 120                                 /* NOTREACHED */
 121                         }
 122                 }
 123                 else
 124                         msg("WARNING: no file `%s'\n", dumpdates);
 125         }
 126         if (df != NULL) {
 127                 (void) flock(fileno(df), LOCK_SH);
 128                 readdumptimes(df);
 129                 (void) fclose(df);
 130         }
 131 }
 132
 133 static void
 134 readdumptimes(FILE *df)
 135 {
 136         register int i;
 137         register struct dumptime *dtwalk;
 138
 139         for (;;) {
 140                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 141                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 142                         break;
 143                 nddates++;
 144                 dtwalk->dt_next = dthead;
 145                 dthead = dtwalk;
 146         }
 147
 148         ddates_in = 1;
 149         /*
 150          *      arrayify the list, leaving enough room for the additional
 151          *      record that we may have to add to the ddate structure
 152          */
 153         ddatev = (struct dumpdates **)
 154                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 155         dtwalk = dthead;
 156         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 157                 ddatev[i] = &dtwalk->dt_value;
 158 }
 159
 160 void
 161 getdumptime(int createdumpdates)
 162 {
 163         register struct dumpdates *ddp;
 164         register int i;
 165         char *fname;
 166
 167         fname = disk;
 168 #ifdef FDEBUG
 169         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 170                 fname, dumpdates, level);
 171 #endif
 172         spcl.c_ddate = 0;
 173         lastlevel = '0';
 174
 175         /* if we're not going to update dumpdates, there's no point in reading
 176            it, particularly since /var might not be mounted... wait until here
 177            to benefit from the initialization of variables needed by parent */
 178         if (!uflag && level == lastlevel)
 179                 return;
 180         initdumptimes(createdumpdates);
 181         if (ddatev == NULL)
 182                 return;
 183         /*
 184          *      Go find the entry with the same name for a lower increment
 185          *      and older date
 186          */
 187         ITITERATE(i, ddp) {
 188                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 189                         continue;
 190                 if (ddp->dd_level >= level)
 191                         continue;
 192 #ifdef  __linux__
 193                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 194 #else
 195                 if (ddp->dd_ddate <= spcl.c_ddate)
 196 #endif
 197                         continue;
 198                 spcl.c_ddate = ddp->dd_ddate;
 199                 lastlevel = ddp->dd_level;
 200         }
 201 }
 202
 203 void
 204 putdumptime(void)
 205 {
 206         FILE *df;
 207         register struct dumpdates *dtwalk;
 208         register int i;
 209         int fd;
 210         char *fname;
 211
 212         if(uflag == 0)
 213                 return;
 214         if ((df = fopen(dumpdates, "r+")) == NULL)
 215                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 216         fd = fileno(df);
 217         (void) flock(fd, LOCK_EX);
 218         fname = disk;
 219         free((char *)ddatev);
 220         ddatev = 0;
 221         nddates = 0;
 222         dthead = 0;
 223         ddates_in = 0;
 224         readdumptimes(df);
 225         if (fseek(df, 0L, 0) < 0)
 226                 quit("fseek: %s\n", strerror(errno));
 227         spcl.c_ddate = 0;
 228         ITITERATE(i, dtwalk) {
 229                 if (strncmp(fname, dtwalk->dd_name,
 230                                 sizeof (dtwalk->dd_name)) != 0)
 231                         continue;
 232                 if (dtwalk->dd_level != level)
 233                         continue;
 234                 goto found;
 235         }
 236         /*
 237          *      construct the new upper bound;
 238          *      Enough room has been allocated.
 239          */
 240         dtwalk = ddatev[nddates] =
 241                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 242         nddates += 1;
 243   found:
 244         (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 245         dtwalk->dd_level = level;
 246         dtwalk->dd_ddate = spcl.c_date;
 247
 248         ITITERATE(i, dtwalk) {
 249                 dumprecout(df, dtwalk);
 250         }
 251         if (fflush(df))
 252                 quit("%s: %s\n", dumpdates, strerror(errno));
 253         if (ftruncate(fd, ftell(df)))
 254                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 255         (void) fclose(df);
 256         msg("level %c dump on %s", level,
 257 #ifdef  __linux__
 258                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 259 #else
 260                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 261 #endif
 262 }
 263
 264 static void
 265 dumprecout(FILE *file, struct dumpdates *what)
 266 {
 267
 268         if (fprintf(file, DUMPOUTFMT,
 269                     what->dd_name,
 270                     what->dd_level,
 271                     ctime(&what->dd_ddate)) < 0)
 272                 quit("%s: %s\n", dumpdates, strerror(errno));
 273 }
 274
 275 int     recno;
 276
 277 static int
 278 getrecord(FILE *df, struct dumpdates *ddatep)
 279 {
 280         char tbuf[BUFSIZ];
 281
 282         recno = 0;
 283         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 284                 return(-1);
 285         recno++;
 286         if (makedumpdate(ddatep, tbuf) < 0)
 287                 msg("Unknown intermediate format in %s, line %d\n",
 288                         dumpdates, recno);
 289
 290 #ifdef FDEBUG
 291         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 292             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 293 #endif
 294         return(0);
 295 }
 296
 297 static int
 298 makedumpdate(struct dumpdates *ddp, char *tbuf)
 299 {
 300         char un_buf[BUFSIZ];
 301
 302         (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 303         ddp->dd_ddate = unctime(un_buf);
 304         if (ddp->dd_ddate < 0)
 305                 return(-1);
 306         return(0);
 307 }