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 1.9 2005/04/13 16:07:15 joerg Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/queue.h>
  40 #include <sys/time.h>
  41 #ifdef sunos
  42 #include <sys/vnode.h>
  43
  44 #include <ufs/fsdir.h>
  45 #include <ufs/inode.h>
  46 #include <ufs/fs.h>
  47 #else
  48 #include <vfs/ufs/dinode.h>
  49 #endif
  50
  51 #include <protocols/dumprestore.h>
  52
  53 #include <errno.h>
  54 #include <fcntl.h>
  55 #include <stdio.h>
  56 #ifdef __STDC__
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #endif
  60
  61 #include "dump.h"
  62
  63 struct dumptime {
  64         struct  dumpdates dt_value;
  65         SLIST_ENTRY(dumptime) dt_list;
  66 };
  67 SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead);
  68 struct  dumpdates **ddatev = NULL;
  69 int     nddates = 0;
  70
  71 static  void dumprecout(FILE *, struct dumpdates *);
  72 static  int getrecord(FILE *, struct dumpdates *);
  73 static  int makedumpdate(struct dumpdates *, char *);
  74 static  void readdumptimes(FILE *);
  75
  76 void
  77 initdumptimes(void)
  78 {
  79         FILE *df;
  80
  81         if ((df = fopen(dumpdates, "r")) == NULL) {
  82                 if (errno != ENOENT) {
  83                         msg("WARNING: cannot read %s: %s\n", dumpdates,
  84                             strerror(errno));
  85                         return;
  86                 }
  87                 /*
  88                  * Dumpdates does not exist, make an empty one.
  89                  */
  90                 msg("WARNING: no file `%s', making an empty one\n", dumpdates);
  91                 if ((df = fopen(dumpdates, "w")) == NULL) {
  92                         msg("WARNING: cannot create %s: %s\n", dumpdates,
  93                             strerror(errno));
  94                         return;
  95                 }
  96                 fclose(df);
  97                 if ((df = fopen(dumpdates, "r")) == NULL) {
  98                         quit("cannot read %s even after creating it: %s\n",
  99                             dumpdates, strerror(errno));
 100                         /* NOTREACHED */
 101                 }
 102         }
 103         flock(fileno(df), LOCK_SH);
 104         readdumptimes(df);
 105         fclose(df);
 106 }
 107
 108 static void
 109 readdumptimes(FILE *df)
 110 {
 111         int i;
 112         struct dumptime *dtwalk;
 113
 114         for (;;) {
 115                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 116                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 117                         break;
 118                 nddates++;
 119                 SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list);
 120         }
 121
 122         /*
 123          *      arrayify the list, leaving enough room for the additional
 124          *      record that we may have to add to the ddate structure
 125          */
 126         ddatev = (struct dumpdates **)
 127                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 128         dtwalk = SLIST_FIRST(&dthead);
 129         for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list))
 130                 ddatev[i] = &dtwalk->dt_value;
 131 }
 132
 133 void
 134 getdumptime(void)
 135 {
 136         struct dumpdates *ddp;
 137         int i;
 138         char *fname;
 139
 140         fname = disk;
 141 #ifdef FDEBUG
 142         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 143                 fname, dumpdates, level);
 144 #endif
 145         spcl.c_ddate = 0;
 146         lastlevel = '0';
 147
 148         initdumptimes();
 149         /*
 150          *      Go find the entry with the same name for a lower increment
 151          *      and older date
 152          */
 153         ITITERATE(i, ddp) {
 154                 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 155                         continue;
 156                 if (ddp->dd_level >= level)
 157                         continue;
 158                 if (ddp->dd_ddate <= spcl.c_ddate)
 159                         continue;
 160                 spcl.c_ddate = ddp->dd_ddate;
 161                 lastlevel = ddp->dd_level;
 162         }
 163 }
 164
 165 void
 166 putdumptime(void)
 167 {
 168         FILE *df;
 169         struct dumpdates *dtwalk;
 170         int i;
 171         int fd;
 172         char *fname;
 173
 174         if(uflag == 0)
 175                 return;
 176         if ((df = fopen(dumpdates, "r+")) == NULL)
 177                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 178         fd = fileno(df);
 179         flock(fd, LOCK_EX);
 180         fname = disk;
 181         free((char *)ddatev);
 182         ddatev = 0;
 183         nddates = 0;
 184         readdumptimes(df);
 185         if (fseek(df, 0L, 0) < 0)
 186                 quit("fseek: %s\n", strerror(errno));
 187         spcl.c_ddate = 0;
 188         ITITERATE(i, dtwalk) {
 189                 if (strncmp(fname, dtwalk->dd_name,
 190                                 sizeof (dtwalk->dd_name)) != 0)
 191                         continue;
 192                 if (dtwalk->dd_level != level)
 193                         continue;
 194                 goto found;
 195         }
 196         /*
 197          *      construct the new upper bound;
 198          *      Enough room has been allocated.
 199          */
 200         dtwalk = ddatev[nddates] =
 201                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 202         nddates += 1;
 203   found:
 204         strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
 205         dtwalk->dd_level = level;
 206         dtwalk->dd_ddate = spcl.c_date;
 207
 208         ITITERATE(i, dtwalk) {
 209                 dumprecout(df, dtwalk);
 210         }
 211         if (fflush(df))
 212                 quit("%s: %s\n", dumpdates, strerror(errno));
 213         if (ftruncate(fd, ftell(df)))
 214                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 215         fclose(df);
 216         msg("level %c dump on %s", level,
 217                 spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
 218 }
 219
 220 static void
 221 dumprecout(FILE *file, struct dumpdates *what)
 222 {
 223
 224         if (fprintf(file, DUMPOUTFMT,
 225                     what->dd_name,
 226                     what->dd_level,
 227                     ctime(&what->dd_ddate)) < 0)
 228                 quit("%s: %s\n", dumpdates, strerror(errno));
 229 }
 230
 231 int     recno;
 232
 233 static int
 234 getrecord(FILE *df, struct dumpdates *ddatep)
 235 {
 236         char tbuf[BUFSIZ];
 237
 238         recno = 0;
 239         if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf)
 240                 return(-1);
 241         recno++;
 242         if (makedumpdate(ddatep, tbuf) < 0)
 243                 msg("Unknown intermediate format in %s, line %d\n",
 244                         dumpdates, recno);
 245
 246 #ifdef FDEBUG
 247         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 248             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 249 #endif
 250         return(0);
 251 }
 252
 253 static int
 254 makedumpdate(struct dumpdates *ddp, char *tbuf)
 255 {
 256         char un_buf[128];
 257
 258         sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
 259         ddp->dd_ddate = unctime(un_buf);
 260         if (ddp->dd_ddate < 0)
 261                 return(-1);
 262         return(0);
 263 }