itime.c revision 1.19
1 /* $NetBSD: itime.c,v 1.19 2013/01/13 22:53:01 dholland Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)itime.c 8.1 (Berkeley) 6/5/93"; 36 #else 37 __RCSID("$NetBSD: itime.c,v 1.19 2013/01/13 22:53:01 dholland Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/queue.h> 43 #include <sys/time.h> 44 #include <ufs/ufs/dinode.h> 45 46 #include <protocols/dumprestore.h> 47 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <time.h> 54 #include <unistd.h> 55 56 #include "dump.h" 57 58 struct dumptime { 59 struct dumpdates dt_value; 60 SLIST_ENTRY(dumptime) dt_list; 61 }; 62 SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead); 63 struct dumpdates **ddatev = 0; 64 int nddates = 0; 65 66 static void dumprecout(FILE *, struct dumpdates *); 67 static int getrecord(FILE *, struct dumpdates *); 68 static int makedumpdate(struct dumpdates *, const char *); 69 static void readdumptimes(FILE *); 70 71 void 72 initdumptimes(void) 73 { 74 FILE *df; 75 76 if ((df = fopen(dumpdates, "r")) == NULL) { 77 if (errno != ENOENT) { 78 msg("WARNING: cannot read %s: %s\n", dumpdates, 79 strerror(errno)); 80 return; 81 } 82 /* 83 * Dumpdates does not exist, make an empty one. 84 */ 85 msg("WARNING: no file `%s', making an empty one\n", dumpdates); 86 if ((df = fopen(dumpdates, "w")) == NULL) { 87 msg("WARNING: cannot create %s: %s\n", dumpdates, 88 strerror(errno)); 89 return; 90 } 91 (void) fclose(df); 92 if ((df = fopen(dumpdates, "r")) == NULL) { 93 quit("cannot read %s even after creating it: %s\n", 94 dumpdates, strerror(errno)); 95 /* NOTREACHED */ 96 } 97 } 98 (void) flock(fileno(df), LOCK_SH); 99 readdumptimes(df); 100 (void) fclose(df); 101 } 102 103 static void 104 readdumptimes(FILE *df) 105 { 106 int i; 107 struct dumptime *dtwalk; 108 109 for (;;) { 110 dtwalk = (struct dumptime *)xcalloc(1, sizeof(struct dumptime)); 111 if (getrecord(df, &(dtwalk->dt_value)) < 0) { 112 free(dtwalk); 113 break; 114 } 115 nddates++; 116 SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list); 117 } 118 119 /* 120 * arrayify the list, leaving enough room for the additional 121 * record that we may have to add to the ddate structure 122 */ 123 ddatev = (struct dumpdates **) 124 xcalloc((unsigned) (nddates + 1), sizeof(struct dumpdates *)); 125 dtwalk = SLIST_FIRST(&dthead); 126 for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list)) 127 ddatev[i] = &dtwalk->dt_value; 128 } 129 130 void 131 getdumptime(void) 132 { 133 struct dumpdates *ddp; 134 int i; 135 char *fname; 136 137 fname = disk; 138 #ifdef FDEBUG 139 msg("Looking for name %s in dumpdates = %s for level = %c\n", 140 fname, dumpdates, level); 141 #endif 142 spcl.c_ddate = 0; 143 lastlevel = '0'; 144 145 initdumptimes(); 146 /* 147 * Go find the entry with the same name for a lower increment 148 * and older date. If we are doing a true incremental, then 149 * we can use any level as a ref point. 150 */ 151 ITITERATE(i, ddp) { 152 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0) 153 continue; 154 /* trueinc: ostensibly could omit the second clause 155 * since if trueinc is set, we don't care about the level 156 * at all. 157 */ 158 /* if ((!trueinc && (ddp->dd_level >= level)) || 159 (trueinc && (ddp->dd_level > level))) */ 160 if (!trueinc && (ddp->dd_level >= level)) 161 continue; 162 if (ddp->dd_ddate <= iswap32(spcl.c_ddate)) 163 continue; 164 spcl.c_ddate = iswap32(ddp->dd_ddate); 165 lastlevel = ddp->dd_level; 166 } 167 } 168 169 void 170 putdumptime(void) 171 { 172 FILE *df; 173 struct dumpdates *dtwalk, *dtfound; 174 int i; 175 int fd; 176 char *fname; 177 178 if(uflag == 0) 179 return; 180 if ((df = fopen(dumpdates, "r+")) == NULL) 181 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno)); 182 fd = fileno(df); 183 (void) flock(fd, LOCK_EX); 184 fname = disk; 185 free((char *)ddatev); 186 ddatev = 0; 187 nddates = 0; 188 readdumptimes(df); 189 if (fseek(df, 0L, 0) < 0) 190 quit("fseek: %s\n", strerror(errno)); 191 spcl.c_ddate = 0; 192 ITITERATE(i, dtwalk) { 193 if (strncmp(fname, dtwalk->dd_name, 194 sizeof (dtwalk->dd_name)) != 0) 195 continue; 196 if (dtwalk->dd_level != level) 197 continue; 198 goto found; 199 } 200 /* 201 * construct the new upper bound; 202 * Enough room has been allocated. 203 */ 204 dtwalk = ddatev[nddates] = 205 (struct dumpdates *)xcalloc(1, sizeof (struct dumpdates)); 206 nddates += 1; 207 found: 208 (void) strlcpy(dtwalk->dd_name, fname, sizeof(dtwalk->dd_name)); 209 dtwalk->dd_level = level; 210 dtwalk->dd_ddate = iswap32(spcl.c_date); 211 dtfound = dtwalk; 212 213 ITITERATE(i, dtwalk) { 214 dumprecout(df, dtwalk); 215 } 216 if (fflush(df)) 217 quit("%s: %s\n", dumpdates, strerror(errno)); 218 if (ftruncate(fd, ftell(df))) 219 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno)); 220 (void) fclose(df); 221 msg("level %c dump on %s", level, 222 spcl.c_date == 0 ? "the epoch\n" : ctime(&dtfound->dd_ddate)); 223 } 224 225 static void 226 dumprecout(FILE *file, struct dumpdates *what) 227 { 228 229 if (fprintf(file, DUMPOUTFMT, 230 what->dd_name, 231 what->dd_level, 232 ctime(&what->dd_ddate)) < 0) 233 quit("%s: %s\n", dumpdates, strerror(errno)); 234 } 235 236 int recno; 237 238 static int 239 getrecord(FILE *df, struct dumpdates *ddatep) 240 { 241 char tbuf[BUFSIZ]; 242 243 recno = 0; 244 if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf) 245 return(-1); 246 recno++; 247 if (makedumpdate(ddatep, tbuf) < 0) 248 msg("Unknown intermediate format in %s, line %d\n", 249 dumpdates, recno); 250 251 #ifdef FDEBUG 252 msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level, 253 ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate)); 254 #endif 255 return(0); 256 } 257 258 static int 259 makedumpdate(struct dumpdates *ddp, const char *tbuf) 260 { 261 char un_buf[128]; 262 263 (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf); 264 ddp->dd_ddate = unctime(un_buf); 265 if (ddp->dd_ddate < 0) 266 return(-1); 267 return(0); 268 } 269
Indexes created Mon Sep 22 13:09:51 GMT 2025