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 #include <unistd.h>
  48
  49 #include "dump.h"
  50
  51 struct dumptime {
  52         struct  dumpdates dt_value;
  53         SLIST_ENTRY(dumptime) dt_list;
  54 };
  55 SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead);
  56 struct  dumpdates **ddatev = NULL;
  57 int     nddates = 0;
  58
  59 static  void dumprecout(FILE *, struct dumpdates *);
  60 static  int getrecord(FILE *, struct dumpdates *);
  61 static  int makedumpdate(struct dumpdates *, char *);
  62 static  void readdumptimes(FILE *);
  63
  64 void
  65 initdumptimes(void)
  66 {
  67         FILE *df;
  68
  69         if ((df = fopen(dumpdates, "r")) == NULL) {
  70                 if (errno != ENOENT) {
  71                         msg("WARNING: cannot read %s: %s\n", dumpdates,
  72                             strerror(errno));
  73                         return;
  74                 }
  75                 /*
  76                  * Dumpdates does not exist, make an empty one.
  77                  */
  78                 msg("WARNING: no file `%s', making an empty one\n", dumpdates);
  79                 if ((df = fopen(dumpdates, "w")) == NULL) {
  80                         msg("WARNING: cannot create %s: %s\n", dumpdates,
  81                             strerror(errno));
  82                         return;
  83                 }
  84                 fclose(df);
  85                 if ((df = fopen(dumpdates, "r")) == NULL) {
  86                         quit("cannot read %s even after creating it: %s\n",
  87                             dumpdates, strerror(errno));
  88                         /* NOTREACHED */
  89                 }
  90         }
  91         flock(fileno(df), LOCK_SH);
  92         readdumptimes(df);
  93         fclose(df);
  94 }
  95
  96 static void
  97 readdumptimes(FILE *df)
  98 {
  99         int i;
 100         struct dumptime *dtwalk;
 101
 102         for (;;) {
 103                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 104                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 105                         break;
 106                 nddates++;
 107                 SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list);
 108         }
 109
 110         /*
 111          *      arrayify the list, leaving enough room for the additional
 112          *      record that we may have to add to the ddate structure
 113          */
 114         ddatev = (struct dumpdates **)
 115                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 116         dtwalk = SLIST_FIRST(&dthead);
 117         for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list))
 118                 ddatev[i] = &dtwalk->dt_value;
 119 }
 120
 121 void
 122 getdumptime(void)
 123 {
 124         struct dumpdates *ddp;
 125         int i;
 126         char *fname;
 127
 128         fname = disk;
 129 #ifdef FDEBUG
 130         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 131                 fname, dumpdates, level);
 132 #endif
 133         spcl.c_ddate = 0;
 134         lastlevel = '0';
 135
 136         initdumptimes();
 137         /*
 138          *      Go find the entry with the same name for a lower increment
 139          *      and older date
 140          */
 141         ITITERATE(i, ddp) {
 142                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 143                         continue;
 144                 if (ddp->dd_level >= level)
 145                         continue;
 146                 if (ddp->dd_ddate <= spcl.c_ddate)
 147                         continue;
 148                 spcl.c_ddate = ddp->dd_ddate;
 149                 lastlevel = ddp->dd_level;
 150         }
 151 }
 152
 153 void
 154 putdumptime(void)
 155 {
 156         FILE *df;
 157         struct dumpdates *dtwalk;
 158         int i;
 159         int fd;
 160         char *fname;
 161
 162         if(uflag == 0)
 163                 return;
 164         if ((df = fopen(dumpdates, "r+")) == NULL)
 165                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 166         fd = fileno(df);
 167         flock(fd, LOCK_EX);
 168         fname = disk;
 169         free((char *)ddatev);
 170         ddatev = NULL;
 171         nddates = 0;
 172         readdumptimes(df);
 173         if (fseek(df, 0L, 0) < 0)
 174                 quit("fseek: %s\n", strerror(errno));
 175         spcl.c_ddate = 0;
 176         ITITERATE(i, dtwalk) {
 177                 if (strncmp(fname, dtwalk->dd_name,
 178                                 sizeof (dtwalk->dd_name)) != 0)
 179                         continue;
 180                 if (dtwalk->dd_level != level)
 181                         continue;
 182                 goto found;
 183         }
 184         /*
 185          *      construct the new upper bound;
 186          *      Enough room has been allocated.
 187          */
 188         dtwalk = ddatev[nddates] =
 189                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 190         nddates += 1;
 191   found:
 192         strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 193         dtwalk->dd_level = level;
 194         dtwalk->dd_ddate = spcl.c_date;
 195
 196         ITITERATE(i, dtwalk) {
 197                 dumprecout(df, dtwalk);
 198         }
 199         if (fflush(df))
 200                 quit("%s: %s\n", dumpdates, strerror(errno));
 201         if (ftruncate(fd, ftell(df)))
 202                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 203         fclose(df);
 204         msg("level %c dump on %s", level,
 205                 spcl.c_date == 0 ? "the epoch\n" : ctime((const time_t *)&spcl.c_date));
 206 }
 207
 208 static void
 209 dumprecout(FILE *file, struct dumpdates *what)
 210 {
 211
 212         if (fprintf(file, DUMPOUTFMT,
 213                     what->dd_name,
 214                     what->dd_level,
 215                     ctime(&what->dd_ddate)) < 0)
 216                 quit("%s: %s\n", dumpdates, strerror(errno));
 217 }
 218
 219 int     recno;
 220
 221 static int
 222 getrecord(FILE *df, struct dumpdates *ddatep)
 223 {
 224         char tbuf[BUFSIZ];
 225
 226         recno = 0;
 227         if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf)
 228                 return(-1);
 229         recno++;
 230         if (makedumpdate(ddatep, tbuf) < 0)
 231                 msg("Unknown intermediate format in %s, line %d\n",
 232                         dumpdates, recno);
 233
 234 #ifdef FDEBUG
 235         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 236             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 237 #endif
 238         return(0);
 239 }
 240
 241 static int
 242 makedumpdate(struct dumpdates *ddp, char *tbuf)
 243 {
 244         char un_buf[128];
 245
 246         sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 247         ddp->dd_ddate = unctime(un_buf);
 248         if (ddp->dd_ddate < 0)
 249                 return(-1);
 250         return(0);
 251 }