df.c revision 1.81
1 /* $NetBSD: df.c,v 1.81 2008/03/04 18:55:57 christos 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\n\ 41 The Regents of the University of California. All rights reserved.\n"); 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 1.81 2008/03/04 18:55:57 christos 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 <util.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 66 extern char *strpct(u_long, u_long, u_int); 67 68 int main(int, char *[]); 69 int bread(off_t, void *, int); 70 char *getmntpt(char *); 71 void prtstat(struct statvfs *, int); 72 int selected(const char *, size_t); 73 void maketypelist(char *); 74 long regetmntinfo(struct statvfs **, long); 75 void usage(void); 76 void prthumanval(int64_t, const char *); 77 void prthuman(struct statvfs *, int64_t, int64_t); 78 const char * 79 strpct64(uint64_t, uint64_t, u_int); 80 81 int aflag, gflag, hflag, iflag, lflag, nflag, Pflag; 82 long usize = 0; 83 char **typelist = NULL; 84 85 int 86 main(int argc, char *argv[]) 87 { 88 struct stat stbuf; 89 struct statvfs *mntbuf; 90 long mntsize; 91 int ch, i, maxwidth, width; 92 char *mntpt; 93 94 while ((ch = getopt(argc, argv, "aGghiklmnPt:")) != -1) 95 switch (ch) { 96 case 'a': 97 aflag = 1; 98 break; 99 case 'g': 100 hflag = 0; 101 usize = 1024 * 1024 * 1024; 102 break; 103 case 'G': 104 gflag = 1; 105 break; 106 case 'h': 107 hflag = 1; 108 usize = 0; 109 break; 110 case 'i': 111 iflag = 1; 112 break; 113 case 'k': 114 hflag = 0; 115 usize = 1024; 116 break; 117 case 'l': 118 lflag = 1; 119 break; 120 case 'm': 121 hflag = 0; 122 usize = 1024 * 1024; 123 break; 124 case 'n': 125 nflag = 1; 126 break; 127 case 'P': 128 Pflag = 1; 129 break; 130 case 't': 131 if (typelist != NULL) 132 errx(EXIT_FAILURE, 133 "only one -t option may be specified."); 134 maketypelist(optarg); 135 break; 136 case '?': 137 default: 138 usage(); 139 } 140 141 if (gflag && (Pflag || iflag)) 142 errx(EXIT_FAILURE, 143 "only one of -G and -P or -i may be specified"); 144 if (Pflag && iflag) 145 errx(EXIT_FAILURE, 146 "only one of -P and -i may be specified"); 147 #if 0 148 /* 149 * The block size cannot be checked until after getbsize() is called. 150 */ 151 if (Pflag && (hflag || (usize != 1024 && usize != 512))) 152 errx(EXIT_FAILURE, 153 "non-standard block size incompatible with -P"); 154 #endif 155 argc -= optind; 156 argv += optind; 157 158 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 159 if (mntsize == 0) 160 err(EXIT_FAILURE, 161 "retrieving information on mounted file systems"); 162 163 if (*argv == NULL) { 164 mntsize = regetmntinfo(&mntbuf, mntsize); 165 } else { 166 if ((mntbuf = malloc(argc * sizeof(*mntbuf))) == NULL) 167 err(EXIT_FAILURE, "can't allocate statvfs array"); 168 mntsize = 0; 169 for (/*EMPTY*/; *argv != NULL; argv++) { 170 if (stat(*argv, &stbuf) < 0) { 171 if ((mntpt = getmntpt(*argv)) == 0) { 172 warn("%s", *argv); 173 continue; 174 } 175 } else if (S_ISBLK(stbuf.st_mode)) { 176 if ((mntpt = getmntpt(*argv)) == 0) 177 mntpt = *argv; 178 } else 179 mntpt = *argv; 180 /* 181 * Statfs does not take a `wait' flag, so we cannot 182 * implement nflag here. 183 */ 184 if (!statvfs(mntpt, &mntbuf[mntsize])) 185 if (lflag && 186 (mntbuf[mntsize].f_flag & MNT_LOCAL) == 0) 187 warnx("Warning: %s is not a local %s", 188 *argv, "file system"); 189 else if 190 (!selected(mntbuf[mntsize].f_fstypename, 191 sizeof(mntbuf[mntsize].f_fstypename))) 192 warnx("Warning: %s mounted as a %s %s", 193 *argv, 194 mntbuf[mntsize].f_fstypename, 195 "file system"); 196 else 197 ++mntsize; 198 else 199 warn("%s", *argv); 200 } 201 } 202 203 maxwidth = 0; 204 for (i = 0; i < mntsize; i++) { 205 width = (int)strlen(mntbuf[i].f_mntfromname); 206 if (width > maxwidth) 207 maxwidth = width; 208 } 209 for (i = 0; i < mntsize; i++) 210 prtstat(&mntbuf[i], maxwidth); 211 exit(0); 212 /* NOTREACHED */ 213 } 214 215 char * 216 getmntpt(char *name) 217 { 218 long mntsize, i; 219 struct statvfs *mntbuf; 220 221 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 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 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 void 246 maketypelist(char *fslist) 247 { 248 int 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(char *))) == 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 long 289 regetmntinfo(struct statvfs **mntbufp, long mntsize) 290 { 291 int i, j; 292 struct statvfs *mntbuf; 293 294 if (!lflag && typelist == NULL && aflag) 295 return (nflag ? mntsize : 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 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 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 && (fsbs) < (bs)) ? \ 352 (int64_t)(num) / (int64_t)((bs) / (fsbs)) : \ 353 (int64_t)(num) * ((fsbs) / (bs))) 354 355 /* 356 * Print out status about a filesystem. 357 */ 358 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; 368 369 if (gflag) { 370 /* 371 * From SunOS-5.6: 372 * 373 * /var (/dev/dsk/c0t0d0s3 ): 8192 block size 1024 frag size 374 * 984242 total blocks 860692 free blocks 859708 available 249984 total files 375 * 248691 free files 8388611 filesys id 376 * ufs fstype 0x00000004 flag 255 filename length 377 * 378 */ 379 (void)printf("%10s (%-12s): %7ld block size %12ld frag size\n", 380 sfsp->f_mntonname, sfsp->f_mntfromname, 381 sfsp->f_iosize, /* On UFS/FFS systems this is 382 * also called the "optimal 383 * transfer block size" but it 384 * is of course the file 385 * system's block size too. 386 */ 387 sfsp->f_bsize); /* not so surprisingly the 388 * "fundamental file system 389 * block size" is the frag 390 * size. 391 */ 392 (void)printf("%10" PRId64 " total blocks %10" PRId64 393 " free blocks %10" PRId64 " available\n", 394 (uint64_t)sfsp->f_blocks, (uint64_t)sfsp->f_bfree, 395 (uint64_t)sfsp->f_bavail); 396 (void)printf("%10" PRId64 " total files %10" PRId64 397 " free files %12lx filesys id\n", 398 (uint64_t)sfsp->f_ffree, (uint64_t)sfsp->f_files, 399 sfsp->f_fsid); 400 (void)printf("%10s fstype %#15lx flag %17ld filename " 401 "length\n", sfsp->f_fstypename, sfsp->f_flag, 402 sfsp->f_namemax); 403 (void)printf("%10lu owner %17" PRId64 " syncwrites %12" PRId64 404 " asyncwrites\n\n", (unsigned long)sfsp->f_owner, 405 sfsp->f_syncwrites, sfsp->f_asyncwrites); 406 407 /* 408 * a concession by the structured programming police to the 409 * indentation police.... 410 */ 411 return; 412 } 413 if (maxwidth < 12) 414 maxwidth = 12; 415 if (++timesthrough == 1) { 416 switch (blocksize = usize) { 417 case 1024: 418 header = Pflag ? "1024-blocks" : "1K-blocks"; 419 headerlen = (int)strlen(header); 420 break; 421 case 1024 * 1024: 422 header = "1M-blocks"; 423 headerlen = (int)strlen(header); 424 break; 425 case 1024 * 1024 * 1024: 426 header = "1G-blocks"; 427 headerlen = (int)strlen(header); 428 break; 429 default: 430 if (hflag) { 431 header = "Size"; 432 headerlen = (int)strlen(header); 433 } else 434 header = getbsize(&headerlen, &blocksize); 435 break; 436 } 437 if (Pflag) { 438 /* 439 * either: 440 * "Filesystem 1024-blocks Used Available Capacity Mounted on\n" 441 * or: 442 * "Filesystem 512-blocks Used Available Capacity Mounted on\n" 443 */ 444 if (blocksize != 1024 && blocksize != 512) 445 errx(EXIT_FAILURE, 446 "non-standard block size incompatible with -P"); 447 (void)printf("Filesystem %s Used Available Capacity " 448 "Mounted on\n", header); 449 } else { 450 (void)printf("%-*.*s %s Used Avail %%Cap", 451 maxwidth - (headerlen - 9), 452 maxwidth - (headerlen - 9), 453 "Filesystem", header); 454 if (iflag) 455 (void)printf(" iUsed iAvail %%iCap"); 456 (void)printf(" Mounted on\n"); 457 } 458 } 459 used = sfsp->f_blocks - sfsp->f_bfree; 460 bavail = sfsp->f_bfree - sfsp->f_bresvd; 461 availblks = bavail + used; 462 if (Pflag) { 463 assert(hflag == 0); 464 assert(blocksize > 0); 465 /* 466 * "%s %d %d %d %s %s\n", <file system name>, <total space>, 467 * <space used>, <space free>, <percentage used>, 468 * <file system root> 469 */ 470 (void)printf("%s %" PRId64 " %" PRId64 " %" PRId64 " %s %s\n", 471 sfsp->f_mntfromname, 472 fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize), 473 fsbtoblk(used, sfsp->f_bsize, blocksize), 474 fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize), 475 availblks == 0 ? full : strpct64((uint64_t) used, 476 (uint64_t) availblks, 0), sfsp->f_mntonname); 477 /* 478 * another concession by the structured programming police to 479 * the indentation police.... 480 * 481 * Note iflag cannot be set when Pflag is set. 482 */ 483 return; 484 } 485 486 (void)printf("%-*.*s ", maxwidth, maxwidth, sfsp->f_mntfromname); 487 488 if (hflag) 489 prthuman(sfsp, used, bavail); 490 else 491 (void)printf("%10" PRId64 " %10" PRId64 " %10" PRId64, 492 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize), 493 fsbtoblk(used, sfsp->f_frsize, blocksize), 494 fsbtoblk(bavail, sfsp->f_frsize, blocksize)); 495 (void)printf(" %4s", 496 availblks == 0 ? full : 497 /* We know that these values are never negative */ 498 strpct64((uint64_t)used, (uint64_t)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 strpct64((uint64_t)used, (uint64_t)inodes, 0)); 506 } 507 (void)printf(" %s\n", sfsp->f_mntonname); 508 } 509 510 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 } 521 522 const char * 523 strpct64(uint64_t numerator, uint64_t denominator, u_int digits) 524 { 525 526 while (denominator > ULONG_MAX) { 527 numerator >>= 1; 528 denominator >>= 1; 529 } 530 return (strpct((u_long)numerator, (u_long)denominator, digits)); 531 } 532
Indexes created Wed Oct 01 18:09:54 GMT 2025