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, 1995, 1996
   5  *
   6  */
   7
   8 /*-
   9  * Copyright (c) 1980, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #ifndef lint
  42 static char sccsid[] = "@(#)itime.c     8.1 (Berkeley) 6/5/93";
  43 #endif /* not lint */
  44
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #ifdef  __linux__
  48 #include <linux/ext2_fs.h>
  49 #include <bsdcompat.h>
  50 #include <sys/file.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 #include <unistd.h>
  72 #endif
  73
  74 #ifdef  __linux__
  75 #include <ext2fs/ext2fs.h>
  76 #endif
  77
  78 #include "dump.h"
  79
  80 struct  dumpdates **ddatev = 0;
  81 int     nddates = 0;
  82 int     ddates_in = 0;
  83 struct  dumptime *dthead = 0;
  84
  85 static  void dumprecout __P((FILE *, struct dumpdates *));
  86 static  int getrecord __P((FILE *, struct dumpdates *));
  87 static  int makedumpdate __P((struct dumpdates *, char *));
  88 static  void readdumptimes __P((FILE *));
  89
  90 void
  91 initdumptimes()
  92 {
  93         FILE *df;
  94
  95         if ((df = fopen(dumpdates, "r")) == NULL) {
  96                 if (errno != ENOENT) {
  97                         quit("cannot read %s: %s\n", dumpdates,
  98                             strerror(errno));
  99                         /* NOTREACHED */
 100                 }
 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         (void) flock(fileno(df), LOCK_SH);
 118         readdumptimes(df);
 119         (void) fclose(df);
 120 }
 121
 122 static void
 123 readdumptimes(df)
 124         FILE *df;
 125 {
 126         register int i;
 127         register struct dumptime *dtwalk;
 128
 129         for (;;) {
 130                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 131                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 132                         break;
 133                 nddates++;
 134                 dtwalk->dt_next = dthead;
 135                 dthead = dtwalk;
 136         }
 137
 138         ddates_in = 1;
 139         /*
 140          *      arrayify the list, leaving enough room for the additional
 141          *      record that we may have to add to the ddate structure
 142          */
 143         ddatev = (struct dumpdates **)
 144                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 145         dtwalk = dthead;
 146         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 147                 ddatev[i] = &dtwalk->dt_value;
 148 }
 149
 150 void
 151 getdumptime()
 152 {
 153         register struct dumpdates *ddp;
 154         register int i;
 155         char *fname;
 156
 157         fname = disk;
 158 #ifdef FDEBUG
 159         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 160                 fname, dumpdates, level);
 161 #endif
 162         spcl.c_ddate = 0;
 163         lastlevel = '0';
 164
 165         initdumptimes();
 166         /*
 167          *      Go find the entry with the same name for a lower increment
 168          *      and older date
 169          */
 170         ITITERATE(i, ddp) {
 171                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 172                         continue;
 173                 if (ddp->dd_level >= level)
 174                         continue;
 175 #ifdef  __linux__
 176                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 177 #else
 178                 if (ddp->dd_ddate <= spcl.c_ddate)
 179 #endif
 180                         continue;
 181                 spcl.c_ddate = ddp->dd_ddate;
 182                 lastlevel = ddp->dd_level;
 183         }
 184 }
 185
 186 void
 187 putdumptime()
 188 {
 189         FILE *df;
 190         register struct dumpdates *dtwalk;
 191         register int i;
 192         int fd;
 193         char *fname;
 194
 195         if(uflag == 0)
 196                 return;
 197         if ((df = fopen(dumpdates, "r+")) == NULL)
 198                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 199         fd = fileno(df);
 200         (void) flock(fd, LOCK_EX);
 201         fname = disk;
 202         free((char *)ddatev);
 203         ddatev = 0;
 204         nddates = 0;
 205         dthead = 0;
 206         ddates_in = 0;
 207         readdumptimes(df);
 208         if (fseek(df, 0L, 0) < 0)
 209                 quit("fseek: %s\n", strerror(errno));
 210         spcl.c_ddate = 0;
 211         ITITERATE(i, dtwalk) {
 212                 if (strncmp(fname, dtwalk->dd_name,
 213                                 sizeof (dtwalk->dd_name)) != 0)
 214                         continue;
 215                 if (dtwalk->dd_level != level)
 216                         continue;
 217                 goto found;
 218         }
 219         /*
 220          *      construct the new upper bound;
 221          *      Enough room has been allocated.
 222          */
 223         dtwalk = ddatev[nddates] =
 224                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 225         nddates += 1;
 226   found:
 227         (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 228         dtwalk->dd_level = level;
 229         dtwalk->dd_ddate = spcl.c_date;
 230
 231         ITITERATE(i, dtwalk) {
 232                 dumprecout(df, dtwalk);
 233         }
 234         if (fflush(df))
 235                 quit("%s: %s\n", dumpdates, strerror(errno));
 236         if (ftruncate(fd, ftell(df)))
 237                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 238         (void) fclose(df);
 239         msg("level %c dump on %s", level,
 240 #ifdef  __linux__
 241                 spcl.c_date == 0 ? "the epoch\n" : ctime4(&spcl.c_date));
 242 #else
 243                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 244 #endif
 245 }
 246
 247 static void
 248 dumprecout(file, what)
 249         FILE *file;
 250         struct dumpdates *what;
 251 {
 252
 253         if (fprintf(file, DUMPOUTFMT,
 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(df, ddatep)
 264         FILE *df;
 265         struct dumpdates *ddatep;
 266 {
 267         char tbuf[BUFSIZ];
 268
 269         recno = 0;
 270         if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf)
 271                 return(-1);
 272         recno++;
 273         if (makedumpdate(ddatep, tbuf) < 0)
 274                 msg("Unknown intermediate format in %s, line %d\n",
 275                         dumpdates, recno);
 276
 277 #ifdef FDEBUG
 278         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 279             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 280 #endif
 281         return(0);
 282 }
 283
 284 static int
 285 makedumpdate(ddp, tbuf)
 286         struct dumpdates *ddp;
 287         char *tbuf;
 288 {
 289         char un_buf[128];
 290
 291         (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 292         ddp->dd_ddate = unctime(un_buf);
 293         if (ddp->dd_ddate < 0)
 294                 return(-1);
 295         return(0);
 296 }