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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)itime.c  8.1 (Berkeley) 6/5/93
  34  * $FreeBSD: src/sbin/dump/itime.c,v 1.3.2.1 2001/08/01 06:29:35 obrien Exp $
  35  * $DragonFly: src/sbin/dump/itime.c,v 1.11 2006/10/21 04:10:02 pavalos Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/queue.h>
  40 #include <sys/time.h>
  41
  42 #include <vfs/ufs/dinode.h>
  43 #include <vfs/ufs/fs.h>
  44
  45 #include <protocols/dumprestore.h>
  46
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <stdio.h>
  50 #ifdef __STDC__
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #endif
  54
  55 #include "dump.h"
  56
  57 struct dumptime {
  58         struct  dumpdates dt_value;
  59         SLIST_ENTRY(dumptime) dt_list;
  60 };
  61 SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead);
  62 struct  dumpdates **ddatev = NULL;
  63 int     nddates = 0;
  64
  65 static  void dumprecout(FILE *, struct dumpdates *);
  66 static  int getrecord(FILE *, struct dumpdates *);
  67 static  int makedumpdate(struct dumpdates *, char *);
  68 static  void readdumptimes(FILE *);
  69
  70 void
  71 initdumptimes(void)
  72 {
  73         FILE *df;
  74
  75         if ((df = fopen(dumpdates, "r")) == NULL) {
  76                 if (errno != ENOENT) {
  77                         msg("WARNING: cannot read %s: %s\n", dumpdates,
  78                             strerror(errno));
  79                         return;
  80                 }
  81                 /*
  82                  * Dumpdates does not exist, make an empty one.
  83                  */
  84                 msg("WARNING: no file `%s', making an empty one\n", dumpdates);
  85                 if ((df = fopen(dumpdates, "w")) == NULL) {
  86                         msg("WARNING: cannot create %s: %s\n", dumpdates,
  87                             strerror(errno));
  88                         return;
  89                 }
  90                 fclose(df);
  91                 if ((df = fopen(dumpdates, "r")) == NULL) {
  92                         quit("cannot read %s even after creating it: %s\n",
  93                             dumpdates, strerror(errno));
  94                         /* NOTREACHED */
  95                 }
  96         }
  97         flock(fileno(df), LOCK_SH);
  98         readdumptimes(df);
  99         fclose(df);
 100 }
 101
 102 static void
 103 readdumptimes(FILE *df)
 104 {
 105         int i;
 106         struct dumptime *dtwalk;
 107
 108         for (;;) {
 109                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 110                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 111                         break;
 112                 nddates++;
 113                 SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list);
 114         }
 115
 116         /*
 117          *      arrayify the list, leaving enough room for the additional
 118          *      record that we may have to add to the ddate structure
 119          */
 120         ddatev = (struct dumpdates **)
 121                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 122         dtwalk = SLIST_FIRST(&dthead);
 123         for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list))
 124                 ddatev[i] = &dtwalk->dt_value;
 125 }
 126
 127 void
 128 getdumptime(void)
 129 {
 130         struct dumpdates *ddp;
 131         int i;
 132         char *fname;
 133
 134         fname = disk;
 135 #ifdef FDEBUG
 136         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 137                 fname, dumpdates, level);
 138 #endif
 139         spcl.c_ddate = 0;
 140         lastlevel = '0';
 141
 142         initdumptimes();
 143         /*
 144          *      Go find the entry with the same name for a lower increment
 145          *      and older date
 146          */
 147         ITITERATE(i, ddp) {
 148                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 149                         continue;
 150                 if (ddp->dd_level >= level)
 151                         continue;
 152                 if (ddp->dd_ddate <= spcl.c_ddate)
 153                         continue;
 154                 spcl.c_ddate = ddp->dd_ddate;
 155                 lastlevel = ddp->dd_level;
 156         }
 157 }
 158
 159 void
 160 putdumptime(void)
 161 {
 162         FILE *df;
 163         struct dumpdates *dtwalk;
 164         int i;
 165         int fd;
 166         char *fname;
 167
 168         if(uflag == 0)
 169                 return;
 170         if ((df = fopen(dumpdates, "r+")) == NULL)
 171                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 172         fd = fileno(df);
 173         flock(fd, LOCK_EX);
 174         fname = disk;
 175         free((char *)ddatev);
 176         ddatev = 0;
 177         nddates = 0;
 178         readdumptimes(df);
 179         if (fseek(df, 0L, 0) < 0)
 180                 quit("fseek: %s\n", strerror(errno));
 181         spcl.c_ddate = 0;
 182         ITITERATE(i, dtwalk) {
 183                 if (strncmp(fname, dtwalk->dd_name,
 184                                 sizeof (dtwalk->dd_name)) != 0)
 185                         continue;
 186                 if (dtwalk->dd_level != level)
 187                         continue;
 188                 goto found;
 189         }
 190         /*
 191          *      construct the new upper bound;
 192          *      Enough room has been allocated.
 193          */
 194         dtwalk = ddatev[nddates] =
 195                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 196         nddates += 1;
 197   found:
 198         strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 199         dtwalk->dd_level = level;
 200         dtwalk->dd_ddate = spcl.c_date;
 201
 202         ITITERATE(i, dtwalk) {
 203                 dumprecout(df, dtwalk);
 204         }
 205         if (fflush(df))
 206                 quit("%s: %s\n", dumpdates, strerror(errno));
 207         if (ftruncate(fd, ftell(df)))
 208                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 209         fclose(df);
 210         msg("level %c dump on %s", level,
 211                 spcl.c_date == 0 ? "the epoch\n" : ctime((const time_t *)&spcl.c_date));
 212 }
 213
 214 static void
 215 dumprecout(FILE *file, struct dumpdates *what)
 216 {
 217
 218         if (fprintf(file, DUMPOUTFMT,
 219                     what->dd_name,
 220                     what->dd_level,
 221                     ctime(&what->dd_ddate)) < 0)
 222                 quit("%s: %s\n", dumpdates, strerror(errno));
 223 }
 224
 225 int     recno;
 226
 227 static int
 228 getrecord(FILE *df, struct dumpdates *ddatep)
 229 {
 230         char tbuf[BUFSIZ];
 231
 232         recno = 0;
 233         if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf)
 234                 return(-1);
 235         recno++;
 236         if (makedumpdate(ddatep, tbuf) < 0)
 237                 msg("Unknown intermediate format in %s, line %d\n",
 238                         dumpdates, recno);
 239
 240 #ifdef FDEBUG
 241         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 242             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 243 #endif
 244         return(0);
 245 }
 246
 247 static int
 248 makedumpdate(struct dumpdates *ddp, char *tbuf)
 249 {
 250         char un_buf[128];
 251
 252         sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 253         ddp->dd_ddate = unctime(un_buf);
 254         if (ddp->dd_ddate < 0)
 255                 return(-1);
 256         return(0);
 257 }