df.c revision 1.76
1 /* $NetBSD: df.c,v 1.76 2007/07/17 20:03:10 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 1.76 2007/07/17 20:03:10 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(1, "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(1, "only one of -g and -P or -i may be specified"); 142 if (Pflag && iflag) 143 errx(1, "only one of -P and -i may be specified"); 144 if (Pflag && (hflag || (usize != 1024 && usize != 512))) 145 errx(1, "non-standard block size incompatible with -P"); 146 147 argc -= optind; 148 argv += optind; 149 150 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 151 if (mntsize == 0) 152 err(1, "retrieving information on mounted file systems"); 153 154 if (*argv == NULL) { 155 mntsize = regetmntinfo(&mntbuf, mntsize); 156 } else { 157 if ((mntbuf = malloc(argc * sizeof(*mntbuf))) == NULL) 158 err(1, "can't allocate statvfs array"); 159 mntsize = 0; 160 for (; *argv != NULL; argv++) { 161 if (stat(*argv, &stbuf) < 0) { 162 if ((mntpt = getmntpt(*argv)) == 0) { 163 warn("%s", *argv); 164 continue; 165 } 166 } else if (S_ISBLK(stbuf.st_mode)) { 167 if ((mntpt = getmntpt(*argv)) == 0) 168 mntpt = *argv; 169 } else 170 mntpt = *argv; 171 /* 172 * Statfs does not take a `wait' flag, so we cannot 173 * implement nflag here. 174 */ 175 if (!statvfs(mntpt, &mntbuf[mntsize])) 176 if (lflag && 177 (mntbuf[mntsize].f_flag & MNT_LOCAL) == 0) 178 warnx("Warning: %s is not a local %s", 179 *argv, "file system"); 180 else if 181 (!selected(mntbuf[mntsize].f_fstypename, 182 sizeof(mntbuf[mntsize].f_fstypename))) 183 warnx("Warning: %s mounted as a %s %s", 184 *argv, 185 mntbuf[mntsize].f_fstypename, 186 "file system"); 187 else 188 ++mntsize; 189 else 190 warn("%s", *argv); 191 } 192 } 193 194 maxwidth = 0; 195 for (i = 0; i < mntsize; i++) { 196 width = strlen(mntbuf[i].f_mntfromname); 197 if (width > maxwidth) 198 maxwidth = width; 199 } 200 for (i = 0; i < mntsize; i++) 201 prtstat(&mntbuf[i], maxwidth); 202 exit(0); 203 /* NOTREACHED */ 204 } 205 206 char * 207 getmntpt(char *name) 208 { 209 long mntsize, i; 210 struct statvfs *mntbuf; 211 212 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 213 for (i = 0; i < mntsize; i++) { 214 if (!strcmp(mntbuf[i].f_mntfromname, name)) 215 return (mntbuf[i].f_mntonname); 216 } 217 return (0); 218 } 219 220 static enum { IN_LIST, NOT_IN_LIST } which; 221 222 int 223 selected(const char *type, size_t len) 224 { 225 char **av; 226 227 /* If no type specified, it's always selected. */ 228 if (typelist == NULL) 229 return (1); 230 for (av = typelist; *av != NULL; ++av) 231 if (!strncmp(type, *av, len)) 232 return (which == IN_LIST ? 1 : 0); 233 return (which == IN_LIST ? 0 : 1); 234 } 235 236 void 237 maketypelist(char *fslist) 238 { 239 int i; 240 char *nextcp, **av; 241 242 if ((fslist == NULL) || (fslist[0] == '\0')) 243 errx(1, "empty type list"); 244 245 /* 246 * XXX 247 * Note: the syntax is "noxxx,yyy" for no xxx's and 248 * no yyy's, not the more intuitive "noyyy,noyyy". 249 */ 250 if (fslist[0] == 'n' && fslist[1] == 'o') { 251 fslist += 2; 252 which = NOT_IN_LIST; 253 } else 254 which = IN_LIST; 255 256 /* Count the number of types. */ 257 for (i = 1, nextcp = fslist; 258 (nextcp = strchr(nextcp, ',')) != NULL; i++) 259 ++nextcp; 260 261 /* Build an array of that many types. */ 262 if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL) 263 err(1, "can't allocate type array"); 264 av[0] = fslist; 265 for (i = 1, nextcp = fslist; 266 (nextcp = strchr(nextcp, ',')) != NULL; i++) { 267 *nextcp = '\0'; 268 av[i] = ++nextcp; 269 } 270 /* Terminate the array. */ 271 av[i] = NULL; 272 } 273 274 /* 275 * Make a pass over the filesystem info in ``mntbuf'' filtering out 276 * filesystem types not in ``fsmask'' and possibly re-stating to get 277 * current (not cached) info. Returns the new count of valid statvfs bufs. 278 */ 279 long 280 regetmntinfo(struct statvfs **mntbufp, long mntsize) 281 { 282 int i, j; 283 struct statvfs *mntbuf; 284 285 if (!lflag && typelist == NULL && aflag) 286 return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT)); 287 288 mntbuf = *mntbufp; 289 j = 0; 290 for (i = 0; i < mntsize; i++) { 291 if (!aflag && (mntbuf[i].f_flag & MNT_IGNORE) != 0) 292 continue; 293 if (lflag && (mntbuf[i].f_flag & MNT_LOCAL) == 0) 294 continue; 295 if (!selected(mntbuf[i].f_fstypename, 296 sizeof(mntbuf[i].f_fstypename))) 297 continue; 298 if (nflag) 299 mntbuf[j] = mntbuf[i]; 300 else { 301 struct statvfs layerbuf = mntbuf[i]; 302 (void)statvfs(mntbuf[i].f_mntonname, &mntbuf[j]); 303 /* 304 * If the FS name changed, then new data is for 305 * a different layer and we don't want it. 306 */ 307 if (memcmp(layerbuf.f_mntfromname, 308 mntbuf[j].f_mntfromname, MNAMELEN)) 309 mntbuf[j] = layerbuf; 310 } 311 j++; 312 } 313 return (j); 314 } 315 316 void 317 prthumanval(int64_t bytes, const char *pad) 318 { 319 char buf[6]; 320 321 humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1), 322 bytes, "", HN_AUTOSCALE, 323 HN_B | HN_NOSPACE | HN_DECIMAL); 324 325 (void)printf("%s %6s", pad, buf); 326 } 327 328 void 329 prthuman(struct statvfs *sfsp, int64_t used, int64_t bavail) 330 { 331 332 prthumanval(sfsp->f_blocks * sfsp->f_frsize, " "); 333 prthumanval(used * sfsp->f_frsize, " "); 334 prthumanval(bavail * sfsp->f_frsize, " "); 335 } 336 337 /* 338 * Convert statvfs returned filesystem size into BLOCKSIZE units. 339 * Attempts to avoid overflow for large filesystems. 340 */ 341 #define fsbtoblk(num, fsbs, bs) \ 342 (((fsbs) != 0 && (fsbs) < (bs)) ? \ 343 (int64_t)(num) / (int64_t)((bs) / (fsbs)) : \ 344 (int64_t)(num) * ((fsbs) / (bs))) 345 346 /* 347 * Print out status about a filesystem. 348 */ 349 void 350 prtstat(struct statvfs *sfsp, int maxwidth) 351 { 352 static long blocksize; 353 static int headerlen, timesthrough; 354 static const char *header; 355 static const char full[] = "100%"; 356 static const char empty[] = " 0%"; 357 int64_t used, availblks, inodes; 358 int64_t bavail; 359 360 if (gflag) { 361 /* 362 * From SunOS-5.6: 363 * 364 * /var (/dev/dsk/c0t0d0s3 ): 8192 block size 1024 frag size 365 * 984242 total blocks 860692 free blocks 859708 available 249984 total files 366 * 248691 free files 8388611 filesys id 367 * ufs fstype 0x00000004 flag 255 filename length 368 * 369 */ 370 (void)printf("%10s (%-12s): %7ld block size %12ld frag size\n", 371 sfsp->f_mntonname, sfsp->f_mntfromname, 372 sfsp->f_iosize, /* On UFS/FFS systems this is 373 * also called the "optimal 374 * transfer block size" but it 375 * is of course the file 376 * system's block size too. 377 */ 378 sfsp->f_bsize); /* not so surprisingly the 379 * "fundamental file system 380 * block size" is the frag 381 * size. 382 */ 383 (void)printf("%10" PRId64 " total blocks %10" PRId64 384 " free blocks %10" PRId64 " available\n", 385 (uint64_t)sfsp->f_blocks, (uint64_t)sfsp->f_bfree, 386 (uint64_t)sfsp->f_bavail); 387 (void)printf("%10" PRId64 " total files %10" PRId64 388 " free files %12lx filesys id\n", 389 (uint64_t)sfsp->f_ffree, (uint64_t)sfsp->f_files, 390 sfsp->f_fsid); 391 (void)printf("%10s fstype %#15lx flag %17ld filename " 392 "length\n", sfsp->f_fstypename, sfsp->f_flag, 393 sfsp->f_namemax); 394 (void)printf("%10lu owner %17" PRId64 " syncwrites %12" PRId64 395 " asyncwrites\n\n", (unsigned long)sfsp->f_owner, 396 sfsp->f_syncwrites, sfsp->f_asyncwrites); 397 398 /* 399 * a concession by the structured programming police to the 400 * indentation police.... 401 */ 402 return; 403 } 404 if (maxwidth < 12) 405 maxwidth = 12; 406 if (++timesthrough == 1) { 407 switch (blocksize = usize) { 408 case 1024: 409 header = Pflag ? "1024-blocks" : "1K-blocks"; 410 headerlen = strlen(header); 411 break; 412 case 1024 * 1024: 413 header = "1M-blocks"; 414 headerlen = strlen(header); 415 break; 416 case 1024 * 1024 * 1024: 417 header = "1G-blocks"; 418 headerlen = strlen(header); 419 break; 420 default: 421 if (hflag) { 422 header = "Size"; 423 headerlen = strlen(header); 424 } else 425 header = getbsize(&headerlen, &blocksize); 426 break; 427 } 428 if (Pflag) { 429 /* 430 * either: 431 * "Filesystem 1024-blocks Used Available Capacity Mounted on\n" 432 * or: 433 * "Filesystem 512-blocks Used Available Capacity Mounted on\n" 434 */ 435 (void)printf("Filesystem %s Used Available Capacity " 436 "Mounted on\n", header); 437 } else { 438 (void)printf("%-*.*s %s Used Avail %%Cap", 439 maxwidth - (headerlen - 9), 440 maxwidth - (headerlen - 9), 441 "Filesystem", header); 442 if (iflag) 443 (void)printf(" iUsed iAvail %%iCap"); 444 (void)printf(" Mounted on\n"); 445 } 446 } 447 used = sfsp->f_blocks - sfsp->f_bfree; 448 bavail = sfsp->f_bfree - sfsp->f_bresvd; 449 availblks = bavail + used; 450 if (Pflag) { 451 assert(hflag == 0); 452 assert(blocksize > 0); 453 /* 454 * "%s %d %d %d %s %s\n", <file system name>, <total space>, 455 * <space used>, <space free>, <percentage used>, 456 * <file system root> 457 */ 458 (void)printf("%s %" PRId64 " %" PRId64 " %" PRId64 " %s %s\n", 459 sfsp->f_mntfromname, 460 fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize), 461 fsbtoblk(used, sfsp->f_bsize, blocksize), 462 fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize), 463 availblks == 0 ? full : strpct64((uint64_t) used, 464 (uint64_t) availblks, 0), sfsp->f_mntonname); 465 /* 466 * another concession by the structured programming police to 467 * the indentation police.... 468 * 469 * Note iflag cannot be set when Pflag is set. 470 */ 471 return; 472 } 473 474 (void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname); 475 476 if (hflag) 477 prthuman(sfsp, used, bavail); 478 else 479 (void)printf("%10" PRId64 " %10" PRId64 " %10" PRId64, 480 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize), 481 fsbtoblk(used, sfsp->f_frsize, blocksize), 482 fsbtoblk(bavail, sfsp->f_frsize, blocksize)); 483 (void)printf(" %4s", 484 availblks == 0 ? full : 485 /* We know that these values are never negative */ 486 strpct64((uint64_t)used, (uint64_t)availblks, 0)); 487 if (iflag) { 488 inodes = sfsp->f_files; 489 used = inodes - sfsp->f_ffree; 490 (void)printf(" %8ld %8ld %4s", 491 (u_long)used, (u_long)sfsp->f_ffree, 492 inodes == 0 ? (used == 0 ? empty : full) : 493 strpct64((uint64_t)used, (uint64_t)inodes, 0)); 494 } 495 (void)printf(" %s\n", sfsp->f_mntonname); 496 } 497 498 void 499 usage(void) 500 { 501 502 (void)fprintf(stderr, 503 "Usage: %s [-aGgln] [-hkm|-ihkm|-Pk] [-t type] [file | " 504 "file_system ...]\n", 505 getprogname()); 506 exit(1); 507 /* NOTREACHED */ 508 } 509 510 const char * 511 strpct64(uint64_t numerator, uint64_t denominator, u_int digits) 512 { 513 514 while (denominator > ULONG_MAX) { 515 numerator >>= 1; 516 denominator >>= 1; 517 } 518 return (strpct((u_long)numerator, (u_long)denominator, digits)); 519 } 520
Indexes created Wed Oct 01 18:09:54 GMT 2025