dump/itime.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <stelian@popies.net>, 1999-2000
   6  *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
   7  */
   8
   9 /*-
  10  * Copyright (c) 1980, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] =
  44         "$Id: itime.c,v 1.24 2003/03/06 14:35:51 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <config.h>
  48 #include <errno.h>
  49 #include <fcntl.h>
  50 #include <stdio.h>
  51 #ifdef __STDC__
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #endif
  55
  56 #include <sys/param.h>
  57 #include <sys/time.h>
  58 #include <time.h>
  59 #include <fcntl.h>
  60 #ifdef  __linux__
  61 #ifdef HAVE_EXT2FS_EXT2_FS_H
  62 #include <ext2fs/ext2_fs.h>
  63 #else
  64 #include <linux/ext2_fs.h>
  65 #endif
  66 #include <ext2fs/ext2fs.h>
  67 #include <bsdcompat.h>
  68 #include <sys/file.h>
  69 #include <unistd.h>
  70 #elif defined sunos
  71 #include <sys/vnode.h>
  72
  73 #include <ufs/fsdir.h>
  74 #include <ufs/inode.h>
  75 #include <ufs/fs.h>
  76 #else
  77 #include <ufs/ufs/dinode.h>
  78 #endif
  79
  80 #include <protocols/dumprestore.h>
  81
  82 #include "dump.h"
  83
  84 struct  dumpdates **ddatev;
  85 int     nddates;
  86 int     ddates_in;
  87 struct  dumptime *dthead;
  88
  89 static  void dumprecout __P((FILE *, struct dumpdates *));
  90 static  int getrecord __P((FILE *, struct dumpdates *));
  91 static  int makedumpdate __P((struct dumpdates *, char *));
  92 static  void readdumptimes __P((FILE *));
  93
  94 void
  95 initdumptimes(int createdumpdates)
  96 {
  97         FILE *df;
  98         struct flock lock;
  99
 100         if ((df = fopen(dumpdates, "r")) == NULL) {
 101                 if (errno != ENOENT) {
 102                         quit("cannot read %s: %s\n", dumpdates,
 103                             strerror(errno));
 104                         /* NOTREACHED */
 105                 }
 106                 if (createdumpdates) {
 107                         /*
 108                          * Dumpdates does not exist, make an empty one.
 109                          */
 110                         msg("WARNING: no file `%s', making an empty one\n", dumpdates);
 111                         if ((df = fopen(dumpdates, "w")) == NULL) {
 112                                 quit("cannot create %s: %s\n", dumpdates,
 113                                 strerror(errno));
 114                                 /* NOTREACHED */
 115                         }
 116                         (void) fclose(df);
 117                         if ((df = fopen(dumpdates, "r")) == NULL) {
 118                                 quit("cannot read %s even after creating it: %s\n",
 119                                 dumpdates, strerror(errno));
 120                                 /* NOTREACHED */
 121                         }
 122                 }
 123                 else
 124                         msg("WARNING: no file `%s'\n", dumpdates);
 125         }
 126         if (df != NULL) {
 127                 memset(&lock, 0, sizeof(lock));
 128                 lock.l_type = F_RDLCK;
 129                 if (fcntl(fileno(df), F_SETLKW, &lock) < 0)
 130                         quit("cannot set read lock on %s: %s\n",
 131                                 dumpdates, strerror(errno));
 132                 readdumptimes(df);
 133                 (void) fclose(df);
 134         }
 135 }
 136
 137 static void
 138 readdumptimes(FILE *df)
 139 {
 140         int i;
 141         struct  dumptime *dtwalk;
 142
 143         for (;;) {
 144                 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
 145                 if (getrecord(df, &(dtwalk->dt_value)) < 0)
 146                         break;
 147                 nddates++;
 148                 dtwalk->dt_next = dthead;
 149                 dthead = dtwalk;
 150         }
 151
 152         ddates_in = 1;
 153         /*
 154          *      arrayify the list, leaving enough room for the additional
 155          *      record that we may have to add to the ddate structure
 156          */
 157         ddatev = (struct dumpdates **)
 158                 calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *));
 159         dtwalk = dthead;
 160         for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
 161                 ddatev[i] = &dtwalk->dt_value;
 162 }
 163
 164 void
 165 getdumptime(int createdumpdates)
 166 {
 167         struct dumpdates *ddp;
 168         int i;
 169
 170 #ifdef FDEBUG
 171         msg("Looking for name %s in dumpdates = %s for level = %c\n",
 172                 disk, dumpdates, level);
 173 #endif
 174         spcl.c_ddate = 0;
 175         lastlevel = '0';
 176
 177         /* If this is a level 0 dump, and we're not updating
 178            dumpdates, there's no point in trying to read
 179            dumpdates.  It may not exist yet, or may not be mounted.  For
 180            incrementals, we *must* read dumpdates (fail if it's not there!) */
 181         if ( (level == lastlevel) && !createdumpdates)
 182                 return;
 183         initdumptimes(createdumpdates);
 184         if (ddatev == NULL)
 185                 return;
 186         /*
 187          *      Go find the entry with the same name for a lower increment
 188          *      and older date
 189          */
 190         ITITERATE(i, ddp) {
 191                 if (strncmp(disk, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
 192                         continue;
 193                 if (ddp->dd_level >= level)
 194                         continue;
 195                 if (ddp->dd_ddate <= (time_t)spcl.c_ddate)
 196                         continue;
 197                 spcl.c_ddate = ddp->dd_ddate;
 198                 lastlevel = ddp->dd_level;
 199         }
 200 }
 201
 202 void
 203 putdumptime(void)
 204 {
 205         FILE *df;
 206         struct dumpdates *dtwalk;
 207         int i;
 208         int fd;
 209         struct flock lock;
 210
 211         if(uflag == 0)
 212                 return;
 213         if ((df = fopen(dumpdates, "r+")) == NULL)
 214                 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
 215         fd = fileno(df);
 216         memset(&lock, 0, sizeof(lock));
 217         lock.l_type = F_WRLCK;
 218         if (fcntl(fd, F_SETLKW, &lock) < 0)
 219                 quit("cannot set write lock on %s: %s\n", dumpdates, strerror(errno));
 220         free((char *)ddatev);
 221         ddatev = 0;
 222         nddates = 0;
 223         dthead = 0;
 224         ddates_in = 0;
 225         readdumptimes(df);
 226         if (fseek(df, 0L, 0) < 0)
 227                 quit("fseek: %s\n", strerror(errno));
 228         spcl.c_ddate = 0;
 229         ITITERATE(i, dtwalk) {
 230                 if (strncmp(disk, dtwalk->dd_name,
 231                                 sizeof (dtwalk->dd_name)) != 0)
 232                         continue;
 233                 if (dtwalk->dd_level != level)
 234                         continue;
 235                 goto found;
 236         }
 237         /*
 238          *      construct the new upper bound;
 239          *      Enough room has been allocated.
 240          */
 241         dtwalk = ddatev[nddates] =
 242                 (struct dumpdates *)calloc(1, sizeof (struct dumpdates));
 243         nddates += 1;
 244   found:
 245         (void) strncpy(dtwalk->dd_name, disk, sizeof (dtwalk->dd_name));
 246         dtwalk->dd_level = level;
 247         dtwalk->dd_ddate = spcl.c_date;
 248
 249         ITITERATE(i, dtwalk) {
 250                 dumprecout(df, dtwalk);
 251         }
 252         if (fflush(df))
 253                 quit("%s: %s\n", dumpdates, strerror(errno));
 254         if (ftruncate(fd, ftell(df)))
 255                 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
 256         (void) fclose(df);
 257 }
 258
 259 static void
 260 dumprecout(FILE *file, struct dumpdates *what)
 261 {
 262         char buf[26];
 263         struct tm *tms;
 264
 265         tms = localtime(&what->dd_ddate);
 266         strncpy(buf, asctime(tms), sizeof(buf));
 267         if (buf[24] != '\n' || buf[25] != '\0')
 268                 quit("asctime returned an unexpected string\n");
 269         buf[24] = 0;
 270         if (fprintf(file, "%s %c %s %c%2.2d%2.2d\n",
 271                     what->dd_name,
 272                     what->dd_level,
 273                     buf,
 274                     (tms->tm_gmtoff < 0 ? '-' : '+'),
 275                     abs(tms->tm_gmtoff) / 3600,
 276                     abs(tms->tm_gmtoff) % 3600 / 60) < 0)
 277                 quit("%s: %s\n", dumpdates, strerror(errno));
 278 }
 279
 280 int     recno;
 281
 282 static int
 283 getrecord(FILE *df, struct dumpdates *ddatep)
 284 {
 285         char tbuf[BUFSIZ];
 286
 287         recno = 0;
 288         if (fgets(tbuf, sizeof (tbuf), df) == NULL)
 289                 return(-1);
 290         recno++;
 291         if (makedumpdate(ddatep, tbuf) < 0)
 292                 msg("Unknown intermediate format in %s, line %d\n",
 293                         dumpdates, recno);
 294
 295 #ifdef FDEBUG
 296         msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
 297             ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
 298 #endif
 299         return(0);
 300 }
 301
 302 static int
 303 makedumpdate(struct dumpdates *ddp, char *tbuf)
 304 {
 305         char *tok;
 306
 307         /* device name */
 308         if ( NULL == (tok = strsep( &tbuf, " ")) )
 309                 return(-1);
 310         if ( strlen(tok) >  MAXPATHLEN )
 311                 return(-1);
 312         strcpy(ddp->dd_name, tok);
 313
 314         /* eat whitespace */
 315         for( ; *tbuf == ' ' ; tbuf++);
 316
 317         /* dump level */
 318         ddp->dd_level = *tbuf;
 319         ++tbuf;
 320
 321         /* eat whitespace */
 322         for( ; *tbuf == ' ' ; tbuf++);
 323
 324         /* dump date */
 325         ddp->dd_ddate = unctime(tbuf);
 326         if (ddp->dd_ddate < 0)
 327                 return(-1);
 328         /* fstab entry */
 329         ddp->dd_fstab = fstabsearch(ddp->dd_name);
 330         return(0);
 331 }