sbin/dump/itime.c

   1 /*-
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)itime.c  8.1 (Berkeley) 6/5/93
  30  * $FreeBSD: src/sbin/dump/itime.c,v 1.3.2.1 2001/08/01 06:29:35 obrien Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/queue.h>
  35 #include <sys/time.h>
  36
  37 #include <vfs/ufs/dinode.h>
  38 #include <vfs/ufs/fs.h>
  39
  40 #include <protocols/dumprestore.h>
  41
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47
  48 #include "dump.h"
  49
  50 struct dumptime {
  51         struct  dumpdates dt_value;
  52         SLIST_ENTRY(dumptime) dt_list;
  53 };
  54 SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead);
  55 struct  dumpdates **ddatev = NULL;
  56 int     nddates = 0;
  57
  58 static  void dumprecout(FILE *, struct dumpdates *);
  59 static  int getrecord(FILE *, struct dumpdates *);
  60 static  int makedumpdate(struct dumpdates *, char *);
  61 static  void readdumptimes(FILE *);
  62
  63 void
  64 initdumptimes(void)
  65 {
  66         FILE *df;
  67
  68         if ((df = fopen(dumpdates, "r")) == NULL) {
  69                 if (errno != ENOENT) {
  70                         msg("WARNING: cannot read %s: %s\n", dumpdates,
  71                             strerror(errno));
  72                         return;
  73                 }
  74                 /*
  75                  * Dumpdates does not exist, make an empty one.
  76                  */
  77                 msg("WARNING: no file `%s', making an empty one\n", dumpdates);
  78                 if ((df = fopen(dumpdates, "w")) == NULL) {
  79                         msg("WARNING: cannot create %s: %s\n", dumpdates,
  80                             strerror(errno));
  81                         return;
  82                 }
  83                 fclose(df);
  84                 if ((df = fopen(dumpdates, "r")) == NULL) {
  85                         quit("cannot read %s even after creating it: %s\n",
  86                             dumpdates, strerror(errno));
  87                         /* NOTREACHED */
  88                 }
  89         }
  90         flock(fileno(df), LOCK_SH);
  91         readdumptimes(df);
  92         fclose(df);
  93 }
  94
  95 static void
  96 readdumptimes(FILE *df)
  97 {
  98         int i;
  99         struct dumptime *dtwalk;
 100
 101         for (;;) {
 102                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 103                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 104                         break;
 105                 nddates++;
 106                 SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list);
 107         }
 108
 109         /*
 110          *      arrayify the list, leaving enough room for the additional
 111          *      record that we may have to add to the ddate structure
 112          */
 113         ddatev = (struct dumpdates **)
 114                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 115         dtwalk = SLIST_FIRST(&dthead);
 116         for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list))
 117                 ddatev[i] = &dtwalk->dt_value;
 118 }
 119
 120 void
 121 getdumptime(void)
 122 {
 123         struct dumpdates *ddp;
 124         int i;
 125         char *fname;
 126
 127         fname = disk;
 128 #ifdef FDEBUG
 129         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 130                 fname, dumpdates, level);
 131 #endif
 132         spcl.c_ddate = 0;
 133         lastlevel = '0';
 134
 135         initdumptimes();
 136         /*
 137          *      Go find the entry with the same name for a lower increment
 138          *      and older date
 139          */
 140         ITITERATE(i, ddp) {
 141                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 142                         continue;
 143                 if (ddp->dd_level >= level)
 144                         continue;
 145                 if (ddp->dd_ddate <= spcl.c_ddate)
 146                         continue;
 147                 spcl.c_ddate = ddp->dd_ddate;
 148                 lastlevel = ddp->dd_level;
 149         }
 150 }
 151
 152 void
 153 putdumptime(void)
 154 {
 155         FILE *df;
 156         struct dumpdates *dtwalk;
 157         int i;
 158         int fd;
 159         char *fname;
 160
 161         if(uflag == 0)
 162                 return;
 163         if ((df = fopen(dumpdates, "r+")) == NULL)
 164                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 165         fd = fileno(df);
 166         flock(fd, LOCK_EX);
 167         fname = disk;
 168         free((char *)ddatev);
 169         ddatev = NULL;
 170         nddates = 0;
 171         readdumptimes(df);
 172         if (fseek(df, 0L, 0) < 0)
 173                 quit("fseek: %s\n", strerror(errno));
 174         spcl.c_ddate = 0;
 175         ITITERATE(i, dtwalk) {
 176                 if (strncmp(fname, dtwalk->dd_name,
 177                                 sizeof (dtwalk->dd_name)) != 0)
 178                         continue;
 179                 if (dtwalk->dd_level != level)
 180                         continue;
 181                 goto found;
 182         }
 183         /*
 184          *      construct the new upper bound;
 185          *      Enough room has been allocated.
 186          */
 187         dtwalk = ddatev[nddates] =
 188                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 189         nddates += 1;
 190   found:
 191         strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 192         dtwalk->dd_level = level;
 193         dtwalk->dd_ddate = spcl.c_date;
 194
 195         ITITERATE(i, dtwalk) {
 196                 dumprecout(df, dtwalk);
 197         }
 198         if (fflush(df))
 199                 quit("%s: %s\n", dumpdates, strerror(errno));
 200         if (ftruncate(fd, ftell(df)))
 201                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 202         fclose(df);
 203         msg("level %c dump on %s", level,
 204                 spcl.c_date == 0 ? "the epoch\n" : ctime((const time_t *)&spcl.c_date));
 205 }
 206
 207 static void
 208 dumprecout(FILE *file, struct dumpdates *what)
 209 {
 210
 211         if (fprintf(file, DUMPOUTFMT,
 212                     what->dd_name,
 213                     what->dd_level,
 214                     ctime(&what->dd_ddate)) < 0)
 215                 quit("%s: %s\n", dumpdates, strerror(errno));
 216 }
 217
 218 int     recno;
 219
 220 static int
 221 getrecord(FILE *df, struct dumpdates *ddatep)
 222 {
 223         char tbuf[BUFSIZ];
 224
 225         recno = 0;
 226         if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf)
 227                 return(-1);
 228         recno++;
 229         if (makedumpdate(ddatep, tbuf) < 0)
 230                 msg("Unknown intermediate format in %s, line %d\n",
 231                         dumpdates, recno);
 232
 233 #ifdef FDEBUG
 234         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 235             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 236 #endif
 237         return(0);
 238 }
 239
 240 static int
 241 makedumpdate(struct dumpdates *ddp, char *tbuf)
 242 {
 243         char un_buf[128];
 244
 245         sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 246         ddp->dd_ddate = unctime(un_buf);
 247         if (ddp->dd_ddate < 0)
 248                 return(-1);
 249         return(0);
 250 }