sbin/dump/itime.c

   1 /*      $NetBSD: itime.c,v 1.15 2003/08/07 10:04:14 agc Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)itime.c     8.1 (Berkeley) 6/5/93";
  36 #else
  37 __RCSID("$NetBSD: itime.c,v 1.15 2003/08/07 10:04:14 agc Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/param.h>
  42 #include <sys/queue.h>
  43 #include <sys/time.h>
  44 #include <ufs/ufs/dinode.h>
  45
  46 #include <protocols/dumprestore.h>
  47
  48 #include <errno.h>
  49 #include <fcntl.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <time.h>
  54 #include <unistd.h>
  55
  56 #include "dump.h"
  57
  58 struct dumptime {
  59         struct  dumpdates dt_value;
  60         SLIST_ENTRY(dumptime) dt_list;
  61 };
  62 SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead);
  63 struct  dumpdates **ddatev = 0;
  64 int     nddates = 0;
  65
  66 static  void dumprecout(FILE *, struct dumpdates *);
  67 static  int getrecord(FILE *, struct dumpdates *);
  68 static  int makedumpdate(struct dumpdates *, char *);
  69 static  void readdumptimes(FILE *);
  70
  71 void
  72 initdumptimes(void)
  73 {
  74         FILE *df;
  75
  76         if ((df = fopen(dumpdates, "r")) == NULL) {
  77                 if (errno != ENOENT) {
  78                         msg("WARNING: cannot read %s: %s\n", dumpdates,
  79                             strerror(errno));
  80                         return;
  81                 }
  82                 /*
  83                  * Dumpdates does not exist, make an empty one.
  84                  */
  85                 msg("WARNING: no file `%s', making an empty one\n", dumpdates);
  86                 if ((df = fopen(dumpdates, "w")) == NULL) {
  87                         msg("WARNING: cannot create %s: %s\n", dumpdates,
  88                             strerror(errno));
  89                         return;
  90                 }
  91                 (void) fclose(df);
  92                 if ((df = fopen(dumpdates, "r")) == NULL) {
  93                         quit("cannot read %s even after creating it: %s\n",
  94                             dumpdates, strerror(errno));
  95                         /* NOTREACHED */
  96                 }
  97         }
  98         (void) flock(fileno(df), LOCK_SH);
  99         readdumptimes(df);
 100         (void) fclose(df);
 101 }
 102
 103 static void
 104 readdumptimes(FILE *df)
 105 {
 106         int i;
 107         struct  dumptime *dtwalk;
 108
 109         for (;;) {
 110                 dtwalk = (struct dumptime *)xcalloc(1, sizeof(struct dumptime));
 111                 if (getrecord(df, &(dtwalk->dt_value)) < 0) {
 112                         free(dtwalk);
 113                         break;
 114                 }
 115                 nddates++;
 116                 SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list);
 117         }
 118
 119         /*
 120          *      arrayify the list, leaving enough room for the additional
 121          *      record that we may have to add to the ddate structure
 122          */
 123         ddatev = (struct dumpdates **)
 124                 xcalloc((unsigned) (nddates + 1), sizeof(struct dumpdates *));
 125         dtwalk = SLIST_FIRST(&dthead);
 126         for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list))
 127                 ddatev[i] = &dtwalk->dt_value;
 128 }
 129
 130 void
 131 getdumptime(void)
 132 {
 133         struct dumpdates *ddp;
 134         int i;
 135         char *fname;
 136
 137         fname = disk;
 138 #ifdef FDEBUG
 139         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 140                 fname, dumpdates, level);
 141 #endif
 142         spcl.c_ddate = 0;
 143         lastlevel = '0';
 144
 145         initdumptimes();
 146         /*
 147          *      Go find the entry with the same name for a lower increment
 148          *      and older date
 149          */
 150         ITITERATE(i, ddp) {
 151                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 152                         continue;
 153                 if (ddp->dd_level >= level)
 154                         continue;
 155                 if (ddp->dd_ddate <= iswap32(spcl.c_ddate))
 156                         continue;
 157                 spcl.c_ddate = iswap32(ddp->dd_ddate);
 158                 lastlevel = ddp->dd_level;
 159         }
 160 }
 161
 162 void
 163 putdumptime(void)
 164 {
 165         FILE *df;
 166         struct dumpdates *dtwalk, *dtfound;
 167         int i;
 168         int fd;
 169         char *fname;
 170
 171         if(uflag == 0)
 172                 return;
 173         if ((df = fopen(dumpdates, "r+")) == NULL)
 174                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 175         fd = fileno(df);
 176         (void) flock(fd, LOCK_EX);
 177         fname = disk;
 178         free((char *)ddatev);
 179         ddatev = 0;
 180         nddates = 0;
 181         readdumptimes(df);
 182         if (fseek(df, 0L, 0) < 0)
 183                 quit("fseek: %s\n", strerror(errno));
 184         spcl.c_ddate = 0;
 185         ITITERATE(i, dtwalk) {
 186                 if (strncmp(fname, dtwalk->dd_name,
 187                                 sizeof (dtwalk->dd_name)) != 0)
 188                         continue;
 189                 if (dtwalk->dd_level != level)
 190                         continue;
 191                 goto found;
 192         }
 193         /*
 194          *      construct the new upper bound;
 195          *      Enough room has been allocated.
 196          */
 197         dtwalk = ddatev[nddates] =
 198                 (struct dumpdates *)xcalloc(1, sizeof (struct dumpdates));
 199         nddates += 1;
 200   found:
 201         (void) strlcpy(dtwalk->dd_name, fname, sizeof(dtwalk->dd_name));
 202         dtwalk->dd_level = level;
 203         dtwalk->dd_ddate = iswap32(spcl.c_date);
 204         dtfound = dtwalk;
 205
 206         ITITERATE(i, dtwalk) {
 207                 dumprecout(df, dtwalk);
 208         }
 209         if (fflush(df))
 210                 quit("%s: %s\n", dumpdates, strerror(errno));
 211         if (ftruncate(fd, ftell(df)))
 212                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 213         (void) fclose(df);
 214         msg("level %c dump on %s", level,
 215                 spcl.c_date == 0 ? "the epoch\n" : ctime(&dtfound->dd_ddate));
 216 }
 217
 218 static void
 219 dumprecout(FILE *file, struct dumpdates *what)
 220 {
 221
 222         if (fprintf(file, DUMPOUTFMT,
 223                     what->dd_name,
 224                     what->dd_level,
 225                     ctime(&what->dd_ddate)) < 0)
 226                 quit("%s: %s\n", dumpdates, strerror(errno));
 227 }
 228
 229 int     recno;
 230
 231 static int
 232 getrecord(FILE *df, struct dumpdates *ddatep)
 233 {
 234         char tbuf[BUFSIZ];
 235
 236         recno = 0;
 237         if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf)
 238                 return(-1);
 239         recno++;
 240         if (makedumpdate(ddatep, tbuf) < 0)
 241                 msg("Unknown intermediate format in %s, line %d\n",
 242                         dumpdates, recno);
 243
 244 #ifdef FDEBUG
 245         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 246             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 247 #endif
 248         return(0);
 249 }
 250
 251 static int
 252 makedumpdate(struct dumpdates *ddp, char *tbuf)
 253 {
 254         char un_buf[128];
 255
 256         (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 257         ddp->dd_ddate = unctime(un_buf);
 258         if (ddp->dd_ddate < 0)
 259                 return(-1);
 260         return(0);
 261 }