1 /* $NetBSD: du.c,v 1.36 2012/03/11 11:23:20 shattered Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Newcomb. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\ 38 The Regents of the University of California. All rights reserved."); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)du.c 8.5 (Berkeley) 5/4/95"; 44 #else 45 __RCSID("$NetBSD: du.c,v 1.36 2012/03/11 11:23:20 shattered Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 #include <sys/types.h> 51 #include <sys/stat.h> 52 53 #include <dirent.h> 54 #include <err.h> 55 #include <errno.h> 56 #include <fts.h> 57 #include <inttypes.h> 58 #include <util.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 #include <limits.h> 64 65 /* Count inodes or file size */ 66 #define COUNT (iflag ? 1 : p->fts_statp->st_blocks) 67 68 static int linkchk(dev_t, ino_t); 69 static void prstat(const char *, int64_t); 70 __dead static void usage(void); 71 72 static int hflag, iflag; 73 static long blocksize; 74 75 int 76 main(int argc, char *argv[]) 77 { 78 FTS *fts; 79 FTSENT *p; 80 int64_t totalblocks; 81 int ftsoptions, listfiles; 82 int depth; 83 int Hflag, Lflag, aflag, ch, cflag, dflag, gkmflag, nflag, rval, sflag; 84 const char *noargv[2]; 85 86 Hflag = Lflag = aflag = cflag = dflag = gkmflag = nflag = sflag = 0; 87 totalblocks = 0; 88 ftsoptions = FTS_PHYSICAL; 89 depth = INT_MAX; 90 while ((ch = getopt(argc, argv, "HLPacd:ghikmnrsx")) != -1) 91 switch (ch) { 92 case 'H': 93 Hflag = 1; 94 Lflag = 0; 95 break; 96 case 'L': 97 Lflag = 1; 98 Hflag = 0; 99 break; 100 case 'P': 101 Hflag = Lflag = 0; 102 break; 103 case 'a': 104 aflag = 1; 105 break; 106 case 'c': 107 cflag = 1; 108 break; 109 case 'd': 110 dflag = 1; 111 depth = atoi(optarg); 112 if (depth < 0 || depth > SHRT_MAX) { 113 warnx("invalid argument to option d: %s", 114 optarg); 115 usage(); 116 } 117 break; 118 case 'g': 119 blocksize = 1024 * 1024 * 1024; 120 gkmflag = 1; 121 break; 122 case 'h': 123 hflag = 1; 124 break; 125 case 'i': 126 iflag = 1; 127 break; 128 case 'k': 129 blocksize = 1024; 130 gkmflag = 1; 131 break; 132 case 'm': 133 blocksize = 1024 * 1024; 134 gkmflag = 1; 135 break; 136 case 'n': 137 nflag = 1; 138 break; 139 case 'r': 140 break; 141 case 's': 142 sflag = 1; 143 break; 144 case 'x': 145 ftsoptions |= FTS_XDEV; 146 break; 147 case '?': 148 default: 149 usage(); 150 } 151 argc -= optind; 152 argv += optind; 153 154 /* 155 * XXX 156 * Because of the way that fts(3) works, logical walks will not count 157 * the blocks actually used by symbolic links. We rationalize this by 158 * noting that users computing logical sizes are likely to do logical 159 * copies, so not counting the links is correct. The real reason is 160 * that we'd have to re-implement the kernel's symbolic link traversing 161 * algorithm to get this right. If, for example, you have relative 162 * symbolic links referencing other relative symbolic links, it gets 163 * very nasty, very fast. The bottom line is that it's documented in 164 * the man page, so it's a feature. 165 */ 166 if (Hflag) 167 ftsoptions |= FTS_COMFOLLOW; 168 if (Lflag) { 169 ftsoptions &= ~FTS_PHYSICAL; 170 ftsoptions |= FTS_LOGICAL; 171 } 172 173 listfiles = 0; 174 if (aflag) { 175 if (sflag || dflag) 176 usage(); 177 listfiles = 1; 178 } else if (sflag) { 179 if (dflag) 180 usage(); 181 depth = 0; 182 } 183 184 if (!*argv) { 185 noargv[0] = "."; 186 noargv[1] = NULL; 187 argv = __UNCONST(noargv); 188 } 189 190 if (!gkmflag) 191 (void)getbsize(NULL, &blocksize); 192 blocksize /= 512; 193 194 if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL) 195 err(1, "fts_open `%s'", *argv); 196 197 for (rval = 0; (p = fts_read(fts)) != NULL;) { 198 #ifndef __ANDROID__ 199 if (nflag) { 200 switch (p->fts_info) { 201 case FTS_NS: 202 case FTS_SLNONE: 203 /* nothing */ 204 break; 205 default: 206 if (p->fts_statp->st_flags & UF_NODUMP) { 207 fts_set(fts, p, FTS_SKIP); 208 continue; 209 } 210 } 211 } 212 #endif 213 switch (p->fts_info) { 214 case FTS_D: /* Ignore. */ 215 break; 216 case FTS_DP: 217 p->fts_parent->fts_number += 218 p->fts_number += COUNT; 219 if (cflag) 220 totalblocks += COUNT; 221 /* 222 * If listing each directory, or not listing files 223 * or directories and this is post-order of the 224 * root of a traversal, display the total. 225 */ 226 if (p->fts_level <= depth 227 || (!listfiles && !p->fts_level)) 228 prstat(p->fts_path, p->fts_number); 229 break; 230 case FTS_DC: /* Ignore. */ 231 break; 232 case FTS_DNR: /* Warn, continue. */ 233 case FTS_ERR: 234 case FTS_NS: 235 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 236 rval = 1; 237 break; 238 default: 239 if (p->fts_statp->st_nlink > 1 && 240 linkchk(p->fts_statp->st_dev, p->fts_statp->st_ino)) 241 break; 242 /* 243 * If listing each file, or a non-directory file was 244 * the root of a traversal, display the total. 245 */ 246 if (listfiles || !p->fts_level) 247 prstat(p->fts_path, COUNT); 248 p->fts_parent->fts_number += COUNT; 249 if (cflag) 250 totalblocks += COUNT; 251 } 252 } 253 if (errno) 254 err(1, "fts_read"); 255 if (cflag) 256 prstat("total", totalblocks); 257 exit(rval); 258 } 259 260 static void 261 prstat(const char *fname, int64_t blocks) 262 { 263 if (iflag) { 264 (void)printf("%" PRId64 "\t%s\n", blocks, fname); 265 return; 266 } 267 268 if (hflag) { 269 char buf[5]; 270 int64_t sz = blocks * 512; 271 272 humanize_number(buf, sizeof(buf), sz, "", HN_AUTOSCALE, 273 HN_B | HN_NOSPACE | HN_DECIMAL); 274 275 (void)printf("%s\t%s\n", buf, fname); 276 } else 277 (void)printf("%" PRId64 "\t%s\n", 278 howmany(blocks, (int64_t)blocksize), 279 fname); 280 } 281 282 static int 283 linkchk(dev_t dev, ino_t ino) 284 { 285 static struct entry { 286 dev_t dev; 287 ino_t ino; 288 } *htable; 289 static int htshift; /* log(allocated size) */ 290 static int htmask; /* allocated size - 1 */ 291 static int htused; /* 2*number of insertions */ 292 static int sawzero; /* Whether zero is in table or not */ 293 int h, h2; 294 uint64_t tmp; 295 /* this constant is (1<<64)/((1+sqrt(5))/2) 296 * aka (word size)/(golden ratio) 297 */ 298 const uint64_t HTCONST = 11400714819323198485ULL; 299 const int HTBITS = CHAR_BIT * sizeof(tmp); 300 301 /* Never store zero in hashtable */ 302 if (dev == 0 && ino == 0) { 303 h = sawzero; 304 sawzero = 1; 305 return h; 306 } 307 308 /* Extend hash table if necessary, keep load under 0.5 */ 309 if (htused<<1 >= htmask) { 310 struct entry *ohtable; 311 312 if (!htable) 313 htshift = 10; /* starting hashtable size */ 314 else 315 htshift++; /* exponential hashtable growth */ 316 317 htmask = (1 << htshift) - 1; 318 htused = 0; 319 320 ohtable = htable; 321 htable = calloc(htmask+1, sizeof(*htable)); 322 if (!htable) 323 err(1, "calloc"); 324 325 /* populate newly allocated hashtable */ 326 if (ohtable) { 327 int i; 328 for (i = 0; i <= htmask>>1; i++) 329 if (ohtable[i].ino || ohtable[i].dev) 330 linkchk(ohtable[i].dev, ohtable[i].ino); 331 free(ohtable); 332 } 333 } 334 335 /* multiplicative hashing */ 336 tmp = dev; 337 tmp <<= HTBITS>>1; 338 tmp |= ino; 339 tmp *= HTCONST; 340 h = tmp >> (HTBITS - htshift); 341 h2 = 1 | ( tmp >> (HTBITS - (htshift<<1) - 1)); /* must be odd */ 342 343 /* open address hashtable search with double hash probing */ 344 while (htable[h].ino || htable[h].dev) { 345 if ((htable[h].ino == ino) && (htable[h].dev == dev)) 346 return 1; 347 h = (h + h2) & htmask; 348 } 349 350 /* Insert the current entry into hashtable */ 351 htable[h].dev = dev; 352 htable[h].ino = ino; 353 htused++; 354 return 0; 355 } 356 357 static void 358 usage(void) 359 { 360 361 (void)fprintf(stderr, 362 "usage: du [-H | -L | -P] [-a | -d depth | -s] [-cghikmnrx] [file ...]\n"); 363 exit(1); 364 } 365
