1 /* $NetBSD: df.c,v 1.92 2016/03/05 08:15:01 kamil Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #ifndef lint 39 __COPYRIGHT( 40 "@(#) Copyright (c) 1980, 1990, 1993, 1994\ 41 The Regents of the University of California. All rights reserved."); 42 #endif /* not lint */ 43 44 #ifndef lint 45 #if 0 46 static char sccsid[] = "@(#)df.c 8.7 (Berkeley) 4/2/94"; 47 #else 48 __RCSID("$NetBSD: df.c,v 1.92 2016/03/05 08:15:01 kamil Exp $"); 49 #endif 50 #endif /* not lint */ 51 52 #include <sys/param.h> 53 #include <sys/stat.h> 54 #include <sys/mount.h> 55 56 #include <assert.h> 57 #include <err.h> 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <locale.h> 61 #include <util.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <unistd.h> 66 #include <util.h> 67 68 static char *getmntpt(const char *); 69 static void prtstat(struct statvfs *, int); 70 static int selected(const char *, size_t); 71 static void maketypelist(char *); 72 static size_t regetmntinfo(struct statvfs **, size_t); 73 __dead static void usage(void); 74 static void prthumanval(int64_t, const char *); 75 static void prthuman(struct statvfs *, int64_t, int64_t); 76 77 static int aflag, gflag, hflag, iflag, lflag, nflag, Pflag; 78 static long usize; 79 static char **typelist; 80 81 int 82 main(int argc, char *argv[]) 83 { 84 struct stat stbuf; 85 struct statvfs *mntbuf; 86 long mntsize; 87 int ch, i, maxwidth, width; 88 char *mntpt; 89 90 setprogname(argv[0]); 91 (void)setlocale(LC_ALL, ""); 92 93 while ((ch = getopt(argc, argv, "aGghiklmnPt:")) != -1) 94 switch (ch) { 95 case 'a': 96 aflag = 1; 97 break; 98 case 'g': 99 hflag = 0; 100 usize = 1024 * 1024 * 1024; 101 break; 102 case 'G': 103 gflag = 1; 104 break; 105 case 'h': 106 hflag = 1; 107 usize = 0; 108 break; 109 case 'i': 110 iflag = 1; 111 break; 112 case 'k': 113 hflag = 0; 114 usize = 1024; 115 break; 116 case 'l': 117 lflag = 1; 118 break; 119 case 'm': 120 hflag = 0; 121 usize = 1024 * 1024; 122 break; 123 case 'n': 124 nflag = 1; 125 break; 126 case 'P': 127 Pflag = 1; 128 break; 129 case 't': 130 if (typelist != NULL) 131 errx(EXIT_FAILURE, 132 "only one -t option may be specified."); 133 maketypelist(optarg); 134 break; 135 case '?': 136 default: 137 usage(); 138 } 139 140 if (gflag && (Pflag || iflag)) 141 errx(EXIT_FAILURE, 142 "only one of -G and -P or -i may be specified"); 143 if (Pflag && iflag) 144 errx(EXIT_FAILURE, 145 "only one of -P and -i may be specified"); 146 #if 0 147 /* 148 * The block size cannot be checked until after getbsize() is called. 149 */ 150 if (Pflag && (hflag || (usize != 1024 && usize != 512))) 151 errx(EXIT_FAILURE, 152 "non-standard block size incompatible with -P"); 153 #endif 154 argc -= optind; 155 argv += optind; 156 157 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 158 if (mntsize == 0) 159 err(EXIT_FAILURE, 160 "retrieving information on mounted file systems"); 161 162 if (*argv == NULL) { 163 mntsize = regetmntinfo(&mntbuf, mntsize); 164 } else { 165 if ((mntbuf = malloc(argc * sizeof(*mntbuf))) == NULL) 166 err(EXIT_FAILURE, "can't allocate statvfs array"); 167 mntsize = 0; 168 for (/*EMPTY*/; *argv != NULL; argv++) { 169 if (stat(*argv, &stbuf) < 0) { 170 if ((mntpt = getmntpt(*argv)) == 0) { 171 warn("%s", *argv); 172 continue; 173 } 174 } else if (S_ISBLK(stbuf.st_mode)) { 175 if ((mntpt = getmntpt(*argv)) == 0) 176 mntpt = *argv; 177 } else 178 mntpt = *argv; 179 /* 180 * Statfs does not take a `wait' flag, so we cannot 181 * implement nflag here. 182 */ 183 if (!statvfs(mntpt, &mntbuf[mntsize])) 184 if (lflag && 185 (mntbuf[mntsize].f_flag & MNT_LOCAL) == 0) 186 warnx("Warning: %s is not a local %s", 187 *argv, "file system"); 188 else if 189 (!selected(mntbuf[mntsize].f_fstypename, 190 sizeof(mntbuf[mntsize].f_fstypename))) 191 warnx("Warning: %s mounted as a %s %s", 192 *argv, 193 mntbuf[mntsize].f_fstypename, 194 "file system"); 195 else 196 ++mntsize; 197 else 198 warn("%s", *argv); 199 } 200 } 201 202 maxwidth = 0; 203 for (i = 0; i < mntsize; i++) { 204 width = (int)strlen(mntbuf[i].f_mntfromname); 205 if (width > maxwidth) 206 maxwidth = width; 207 } 208 for (i = 0; i < mntsize; i++) 209 prtstat(&mntbuf[i], maxwidth); 210 return 0; 211 } 212 213 static char * 214 getmntpt(const char *name) 215 { 216 size_t mntsize, i; 217 struct statvfs *mntbuf; 218 219 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 220 if (mntsize == 0) 221 err(EXIT_FAILURE, "Can't get mount information"); 222 for (i = 0; i < mntsize; i++) { 223 if (!strcmp(mntbuf[i].f_mntfromname, name)) 224 return mntbuf[i].f_mntonname; 225 } 226 return 0; 227 } 228 229 static enum { IN_LIST, NOT_IN_LIST } which; 230 231 static int 232 selected(const char *type, size_t len) 233 { 234 char **av; 235 236 /* If no type specified, it's always selected. */ 237 if (typelist == NULL) 238 return 1; 239 for (av = typelist; *av != NULL; ++av) 240 if (!strncmp(type, *av, len)) 241 return which == IN_LIST ? 1 : 0; 242 return which == IN_LIST ? 0 : 1; 243 } 244 245 static void 246 maketypelist(char *fslist) 247 { 248 size_t i; 249 char *nextcp, **av; 250 251 if ((fslist == NULL) || (fslist[0] == '\0')) 252 errx(EXIT_FAILURE, "empty type list"); 253 254 /* 255 * XXX 256 * Note: the syntax is "noxxx,yyy" for no xxx's and 257 * no yyy's, not the more intuitive "noyyy,noyyy". 258 */ 259 if (fslist[0] == 'n' && fslist[1] == 'o') { 260 fslist += 2; 261 which = NOT_IN_LIST; 262 } else 263 which = IN_LIST; 264 265 /* Count the number of types. */ 266 for (i = 1, nextcp = fslist; 267 (nextcp = strchr(nextcp, ',')) != NULL; i++) 268 ++nextcp; 269 270 /* Build an array of that many types. */ 271 if ((av = typelist = malloc((i + 1) * sizeof(*av))) == NULL) 272 err(EXIT_FAILURE, "can't allocate type array"); 273 av[0] = fslist; 274 for (i = 1, nextcp = fslist; 275 (nextcp = strchr(nextcp, ',')) != NULL; i++) { 276 *nextcp = '\0'; 277 av[i] = ++nextcp; 278 } 279 /* Terminate the array. */ 280 av[i] = NULL; 281 } 282 283 /* 284 * Make a pass over the filesystem info in ``mntbuf'' filtering out 285 * filesystem types not in ``fsmask'' and possibly re-stating to get 286 * current (not cached) info. Returns the new count of valid statvfs bufs. 287 */ 288 static size_t 289 regetmntinfo(struct statvfs **mntbufp, size_t mntsize) 290 { 291 size_t i, j; 292 struct statvfs *mntbuf; 293 294 if (!lflag && typelist == NULL && aflag) 295 return nflag ? mntsize : (size_t)getmntinfo(mntbufp, MNT_WAIT); 296 297 mntbuf = *mntbufp; 298 j = 0; 299 for (i = 0; i < mntsize; i++) { 300 if (!aflag && (mntbuf[i].f_flag & MNT_IGNORE) != 0) 301 continue; 302 if (lflag && (mntbuf[i].f_flag & MNT_LOCAL) == 0) 303 continue; 304 if (!selected(mntbuf[i].f_fstypename, 305 sizeof(mntbuf[i].f_fstypename))) 306 continue; 307 if (nflag) 308 mntbuf[j] = mntbuf[i]; 309 else { 310 struct statvfs layerbuf = mntbuf[i]; 311 (void)statvfs(mntbuf[i].f_mntonname, &mntbuf[j]); 312 /* 313 * If the FS name changed, then new data is for 314 * a different layer and we don't want it. 315 */ 316 if (memcmp(layerbuf.f_mntfromname, 317 mntbuf[j].f_mntfromname, MNAMELEN)) 318 mntbuf[j] = layerbuf; 319 } 320 j++; 321 } 322 return j; 323 } 324 325 static void 326 prthumanval(int64_t bytes, const char *pad) 327 { 328 char buf[6]; 329 330 (void)humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1), 331 bytes, "", HN_AUTOSCALE, 332 HN_B | HN_NOSPACE | HN_DECIMAL); 333 334 (void)printf("%s %6s", pad, buf); 335 } 336 337 static void 338 prthuman(struct statvfs *sfsp, int64_t used, int64_t bavail) 339 { 340 341 prthumanval((int64_t)(sfsp->f_blocks * sfsp->f_frsize), " "); 342 prthumanval((int64_t)(used * sfsp->f_frsize), " "); 343 prthumanval((int64_t)(bavail * sfsp->f_frsize), " "); 344 } 345 346 /* 347 * Convert statvfs returned filesystem size into BLOCKSIZE units. 348 * Attempts to avoid overflow for large filesystems. 349 */ 350 #define fsbtoblk(num, fsbs, bs) \ 351 (((fsbs) != 0 && (uint64_t)(fsbs) < (uint64_t)(bs)) ? \ 352 (int64_t)(num) / (int64_t)((bs) / (fsbs)) : \ 353 (int64_t)(num) * (int64_t)((fsbs) / (bs))) 354 355 /* 356 * Print out status about a filesystem. 357 */ 358 static void 359 prtstat(struct statvfs *sfsp, int maxwidth) 360 { 361 static long blocksize; 362 static int headerlen, timesthrough; 363 static const char *header; 364 static const char full[] = "100"; 365 static const char empty[] = " 0"; 366 int64_t used, availblks, inodes; 367 int64_t bavail; 368 char pb[64]; 369 370 if (gflag) { 371 /* 372 * From SunOS-5.6: 373 * 374 * /var (/dev/dsk/c0t0d0s3 ): 8192 block size 1024 frag size 375 * 984242 total blocks 860692 free blocks 859708 available 249984 total files 376 * 248691 free files 8388611 filesys id 377 * ufs fstype 0x00000004 flag 255 filename length 378 * 379 */ 380 (void)printf("%10s (%-12s): %7ld block size %12ld frag size\n", 381 sfsp->f_mntonname, sfsp->f_mntfromname, 382 sfsp->f_bsize, /* On UFS/FFS systems this is 383 * also called the "optimal 384 * transfer block size" but it 385 * is of course the file 386 * system's block size too. 387 */ 388 sfsp->f_frsize); /* not so surprisingly the 389 * "fundamental file system 390 * block size" is the frag 391 * size. 392 */ 393 (void)printf("%10" PRId64 " total blocks %10" PRId64 394 " free blocks %10" PRId64 " available\n", 395 (uint64_t)sfsp->f_blocks, (uint64_t)sfsp->f_bfree, 396 (uint64_t)sfsp->f_bavail); 397 (void)printf("%10" PRId64 " total files %10" PRId64 398 " free files %12lx filesys id\n", 399 (uint64_t)sfsp->f_ffree, (uint64_t)sfsp->f_files, 400 sfsp->f_fsid); 401 (void)printf("%10s fstype %#15lx flag %17ld filename " 402 "length\n", sfsp->f_fstypename, sfsp->f_flag, 403 sfsp->f_namemax); 404 (void)printf("%10lu owner %17" PRId64 " syncwrites %12" PRId64 405 " asyncwrites\n\n", (unsigned long)sfsp->f_owner, 406 sfsp->f_syncwrites, sfsp->f_asyncwrites); 407 408 /* 409 * a concession by the structured programming police to the 410 * indentation police.... 411 */ 412 return; 413 } 414 if (maxwidth < 12) 415 maxwidth = 12; 416 if (++timesthrough == 1) { 417 switch (blocksize = usize) { 418 case 1024: 419 header = Pflag ? "1024-blocks" : "1K-blocks"; 420 headerlen = (int)strlen(header); 421 break; 422 case 1024 * 1024: 423 header = "1M-blocks"; 424 headerlen = (int)strlen(header); 425 break; 426 case 1024 * 1024 * 1024: 427 header = "1G-blocks"; 428 headerlen = (int)strlen(header); 429 break; 430 default: 431 if (hflag) { 432 header = "Size"; 433 headerlen = (int)strlen(header); 434 } else 435 header = getbsize(&headerlen, &blocksize); 436 break; 437 } 438 if (Pflag) { 439 /* 440 * either: 441 * "Filesystem 1024-blocks Used Available Capacity Mounted on\n" 442 * or: 443 * "Filesystem 512-blocks Used Available Capacity Mounted on\n" 444 */ 445 if (blocksize != 1024 && blocksize != 512) 446 errx(EXIT_FAILURE, 447 "non-standard block size incompatible with -P"); 448 (void)printf("Filesystem %s Used Available Capacity " 449 "Mounted on\n", header); 450 } else { 451 (void)printf("%-*.*s %s Used Avail %%Cap", 452 maxwidth - (headerlen - 10), 453 maxwidth - (headerlen - 10), 454 "Filesystem", header); 455 if (iflag) 456 (void)printf(" iUsed iAvail %%iCap"); 457 (void)printf(" Mounted on\n"); 458 } 459 } 460 used = sfsp->f_blocks - sfsp->f_bfree; 461 bavail = sfsp->f_bfree - sfsp->f_bresvd; 462 availblks = bavail + used; 463 if (Pflag) { 464 assert(hflag == 0); 465 assert(blocksize > 0); 466 /* 467 * "%s %d %d %d %s %s\n", <file system name>, <total space>, 468 * <space used>, <space free>, <percentage used>, 469 * <file system root> 470 */ 471 (void)printf("%s %" PRId64 " %" PRId64 " %" PRId64 " %s%% %s\n", 472 sfsp->f_mntfromname, 473 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize), 474 fsbtoblk(used, sfsp->f_frsize, blocksize), 475 fsbtoblk(bavail, sfsp->f_frsize, blocksize), 476 availblks == 0 ? full : strspct(pb, sizeof(pb), used, 477 availblks, 0), sfsp->f_mntonname); 478 /* 479 * another concession by the structured programming police to 480 * the indentation police.... 481 * 482 * Note iflag cannot be set when Pflag is set. 483 */ 484 return; 485 } 486 487 (void)printf("%-*.*s ", maxwidth, maxwidth, sfsp->f_mntfromname); 488 489 if (hflag) 490 prthuman(sfsp, used, bavail); 491 else 492 (void)printf("%10" PRId64 " %10" PRId64 " %10" PRId64, 493 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize), 494 fsbtoblk(used, sfsp->f_frsize, blocksize), 495 fsbtoblk(bavail, sfsp->f_frsize, blocksize)); 496 (void)printf(" %3s%%", 497 availblks == 0 ? full : 498 strspct(pb, sizeof(pb), used, availblks, 0)); 499 if (iflag) { 500 inodes = sfsp->f_files; 501 used = inodes - sfsp->f_ffree; 502 (void)printf(" %8jd %8jd %4s%%", 503 (intmax_t)used, (intmax_t)sfsp->f_ffree, 504 inodes == 0 ? (used == 0 ? empty : full) : 505 strspct(pb, sizeof(pb), used, inodes, 0)); 506 } 507 (void)printf(" %s\n", sfsp->f_mntonname); 508 } 509 510 static void 511 usage(void) 512 { 513 514 (void)fprintf(stderr, 515 "Usage: %s [-aGgln] [-hkm|-ihkm|-Pk] [-t type] [file | " 516 "file_system ...]\n", 517 getprogname()); 518 exit(1); 519 /* NOTREACHED */ 520 } 521