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