df.c revision 1.97
1 /* $NetBSD: df.c,v 1.97 2020/08/21 16:41:06 ryo 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 1.97 2020/08/21 16:41:06 ryo 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 <stdbool.h> 60 #include <fcntl.h> 61 #include <locale.h> 62 #include <util.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <unistd.h> 67 #include <util.h> 68 69 static char *getmntpt(const char *); 70 static void prtstat(const struct statvfs *, int); 71 static int selected(const char *, size_t); 72 static void maketypelist(char *); 73 static size_t regetmntinfo(struct statvfs **, size_t); 74 __dead static void usage(void); 75 static void prthumanval(int64_t, int); 76 static void prthuman(const struct statvfs *, int64_t, int64_t); 77 78 static int aflag, gflag, hflag, iflag, lflag, nflag, Pflag, Wflag; 79 static long usize; 80 static char **typelist; 81 82 #define WIDTH_INODE 10 83 #define WIDTH_BLKSIZE 12 84 static int blksize_width = WIDTH_BLKSIZE; 85 86 int 87 main(int argc, char *argv[]) 88 { 89 struct stat stbuf; 90 struct statvfs *mntbuf; 91 int ch, maxwidth, width; 92 size_t i, mntcount; 93 char *mntpt; 94 95 setprogname(argv[0]); 96 (void)setlocale(LC_ALL, ""); 97 98 while ((ch = getopt(argc, argv, "aGghiklmnPt:W")) != -1) 99 switch (ch) { 100 case 'a': 101 aflag = 1; 102 break; 103 case 'g': 104 hflag = 0; 105 usize = 1024 * 1024 * 1024; 106 break; 107 case 'G': 108 gflag = 1; 109 break; 110 case 'h': 111 hflag = 1; 112 usize = 0; 113 break; 114 case 'i': 115 iflag = 1; 116 break; 117 case 'k': 118 hflag = 0; 119 usize = 1024; 120 break; 121 case 'l': 122 lflag = 1; 123 break; 124 case 'm': 125 hflag = 0; 126 usize = 1024 * 1024; 127 break; 128 case 'n': 129 nflag = 1; 130 break; 131 case 'P': 132 Pflag = 1; 133 break; 134 case 'W': 135 Wflag = 1; 136 break; 137 case 't': 138 if (typelist != NULL) 139 errx(EXIT_FAILURE, 140 "only one -t option may be specified."); 141 maketypelist(optarg); 142 break; 143 case '?': 144 default: 145 usage(); 146 } 147 148 if (gflag && (Pflag || iflag)) 149 errx(EXIT_FAILURE, 150 "only one of -G and -P or -i may be specified"); 151 if (Pflag && iflag) 152 errx(EXIT_FAILURE, 153 "only one of -P and -i may be specified"); 154 #if 0 155 /* 156 * The block size cannot be checked until after getbsize() is called. 157 */ 158 if (Pflag && (hflag || (usize != 1024 && usize != 512))) 159 errx(EXIT_FAILURE, 160 "non-standard block size incompatible with -P"); 161 #endif 162 argc -= optind; 163 argv += optind; 164 165 mntcount = getmntinfo(&mntbuf, MNT_NOWAIT); 166 if (mntcount == 0) 167 err(EXIT_FAILURE, 168 "retrieving information on mounted file systems"); 169 170 if (*argv == NULL) { 171 mntcount = regetmntinfo(&mntbuf, mntcount); 172 } else { 173 if ((mntbuf = calloc(argc, sizeof(*mntbuf))) == NULL) 174 err(EXIT_FAILURE, "can't allocate statvfs array"); 175 mntcount = 0; 176 for (/*EMPTY*/; *argv != NULL; argv++) { 177 if (stat(*argv, &stbuf) < 0) { 178 if ((mntpt = getmntpt(*argv)) == 0) { 179 warn("%s", *argv); 180 continue; 181 } 182 } else if (S_ISBLK(stbuf.st_mode)) { 183 if ((mntpt = getmntpt(*argv)) == 0) 184 mntpt = *argv; 185 } else 186 mntpt = *argv; 187 /* 188 * Statfs does not take a `wait' flag, so we cannot 189 * implement nflag here. 190 */ 191 if (!statvfs(mntpt, &mntbuf[mntcount])) 192 if (lflag && 193 (mntbuf[mntcount].f_flag & MNT_LOCAL) == 0) 194 warnx("Warning: %s is not a local %s", 195 *argv, "file system"); 196 else if 197 (!selected(mntbuf[mntcount].f_fstypename, 198 sizeof(mntbuf[mntcount].f_fstypename))) 199 warnx("Warning: %s mounted as a %s %s", 200 *argv, 201 mntbuf[mntcount].f_fstypename, 202 "file system"); 203 else 204 ++mntcount; 205 else 206 warn("%s", *argv); 207 } 208 } 209 210 maxwidth = 0; 211 for (i = 0; i < mntcount; i++) { 212 width = (int)strlen(Wflag && mntbuf[i].f_mntfromlabel[0] ? 213 mntbuf[i].f_mntfromlabel : mntbuf[i].f_mntfromname); 214 if (width > maxwidth) 215 maxwidth = width; 216 } 217 for (i = 0; i < mntcount; i++) 218 prtstat(&mntbuf[i], maxwidth); 219 return 0; 220 } 221 222 static char * 223 getmntpt(const char *name) 224 { 225 size_t mntcount, i; 226 struct statvfs *mntbuf; 227 228 mntcount = getmntinfo(&mntbuf, MNT_NOWAIT); 229 if (mntcount == 0) 230 err(EXIT_FAILURE, "Can't get mount information"); 231 for (i = 0; i < mntcount; i++) { 232 if (!strcmp(mntbuf[i].f_mntfromname, name)) 233 return mntbuf[i].f_mntonname; 234 } 235 return 0; 236 } 237 238 static enum { IN_LIST, NOT_IN_LIST } which; 239 240 static int 241 selected(const char *type, size_t len) 242 { 243 char **av; 244 245 /* If no type specified, it's always selected. */ 246 if (typelist == NULL) 247 return 1; 248 for (av = typelist; *av != NULL; ++av) 249 if (!strncmp(type, *av, len)) 250 return which == IN_LIST ? 1 : 0; 251 return which == IN_LIST ? 0 : 1; 252 } 253 254 static void 255 maketypelist(char *fslist) 256 { 257 size_t i; 258 char *nextcp, **av; 259 260 if ((fslist == NULL) || (fslist[0] == '\0')) 261 errx(EXIT_FAILURE, "empty type list"); 262 263 /* 264 * XXX 265 * Note: the syntax is "noxxx,yyy" for no xxx's and 266 * no yyy's, not the more intuitive "noyyy,noyyy". 267 */ 268 if (fslist[0] == 'n' && fslist[1] == 'o') { 269 fslist += 2; 270 which = NOT_IN_LIST; 271 } else 272 which = IN_LIST; 273 274 /* Count the number of types. */ 275 for (i = 1, nextcp = fslist; 276 (nextcp = strchr(nextcp, ',')) != NULL; i++) 277 ++nextcp; 278 279 /* Build an array of that many types. */ 280 if ((av = typelist = calloc((i + 1), sizeof(*av))) == NULL) 281 err(EXIT_FAILURE, "can't allocate type array"); 282 av[0] = fslist; 283 for (i = 1, nextcp = fslist; 284 (nextcp = strchr(nextcp, ',')) != NULL; i++) { 285 *nextcp = '\0'; 286 av[i] = ++nextcp; 287 } 288 /* Terminate the array. */ 289 av[i] = NULL; 290 } 291 292 /* 293 * Make a pass over the filesystem info in ``mntbuf'' filtering out 294 * filesystem types not in ``fsmask'' and possibly re-stating to get 295 * current (not cached) info. Returns the new count of valid statvfs bufs. 296 */ 297 static size_t 298 regetmntinfo(struct statvfs **mntbufp, size_t mntcount) 299 { 300 size_t i, j; 301 struct statvfs *mntbuf; 302 303 if (!lflag && typelist == NULL && aflag) 304 return nflag ? mntcount : (size_t)getmntinfo(mntbufp, MNT_WAIT); 305 306 mntbuf = *mntbufp; 307 j = 0; 308 for (i = 0; i < mntcount; i++) { 309 if (!aflag && (mntbuf[i].f_flag & MNT_IGNORE) != 0) 310 continue; 311 if (lflag && (mntbuf[i].f_flag & MNT_LOCAL) == 0) 312 continue; 313 if (!selected(mntbuf[i].f_fstypename, 314 sizeof(mntbuf[i].f_fstypename))) 315 continue; 316 if (nflag) 317 mntbuf[j] = mntbuf[i]; 318 else { 319 struct statvfs layerbuf = mntbuf[i]; 320 (void)statvfs(mntbuf[i].f_mntonname, &mntbuf[j]); 321 /* 322 * If the FS name changed, then new data is for 323 * a different layer and we don't want it. 324 */ 325 if (memcmp(layerbuf.f_mntfromname, 326 mntbuf[j].f_mntfromname, MNAMELEN)) 327 mntbuf[j] = layerbuf; 328 } 329 j++; 330 } 331 return j; 332 } 333 334 static void 335 prthumanval(int64_t bytes, int width) 336 { 337 char buf[6]; 338 339 (void)humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1), 340 bytes, "", HN_AUTOSCALE, 341 HN_B | HN_NOSPACE | HN_DECIMAL); 342 343 (void)printf("%*s", width, buf); 344 } 345 346 static void 347 prthuman(const struct statvfs *sfsp, int64_t used, int64_t bavail) 348 { 349 350 prthumanval((int64_t)(sfsp->f_blocks * sfsp->f_frsize), blksize_width); 351 prthumanval((int64_t)(used * sfsp->f_frsize), 1 + blksize_width); 352 prthumanval((int64_t)(bavail * sfsp->f_frsize), 1 + blksize_width); 353 } 354 355 /* 356 * Convert statvfs returned filesystem size into BLOCKSIZE units. 357 * Attempts to avoid overflow for large filesystems. 358 */ 359 #define fsbtoblk(num, fsbs, bs) \ 360 (((fsbs) != 0 && (uint64_t)(fsbs) < (uint64_t)(bs)) ? \ 361 (int64_t)(num) / (int64_t)((bs) / (fsbs)) : \ 362 (int64_t)(num) * (int64_t)((fsbs) / (bs))) 363 364 /* 365 * Print out status about a filesystem. 366 */ 367 static void 368 prtstat(const struct statvfs *sfsp, int maxwidth) 369 { 370 static long blocksize; 371 static int headerlen, timesthrough; 372 static const char *header; 373 static const char full[] = "100"; 374 static const char empty[] = " 0"; 375 int64_t used, availblks, inodes; 376 int64_t bavail; 377 char pb[64]; 378 char mntfromname[sizeof(sfsp->f_mntfromname) + 10]; 379 380 if (Wflag && sfsp->f_mntfromlabel[0]) { 381 snprintf(mntfromname, sizeof(mntfromname), "NAME=%s", 382 sfsp->f_mntfromlabel); 383 } else { 384 strlcpy(mntfromname, sfsp->f_mntfromname, sizeof(mntfromname)); 385 } 386 387 if (gflag) { 388 /* 389 * From SunOS-5.6: 390 * 391 * /var (/dev/dsk/c0t0d0s3 ): 8192 block size 1024 frag size 392 * 984242 total blocks 860692 free blocks 859708 available 249984 total files 393 * 248691 free files 8388611 filesys id 394 * ufs fstype 0x00000004 flag 255 filename length 395 * 396 */ 397 (void)printf("%10s (%-12s): %7ld block size %12ld frag size\n", 398 sfsp->f_mntonname, mntfromname, 399 sfsp->f_bsize, /* On UFS/FFS systems this is 400 * also called the "optimal 401 * transfer block size" but it 402 * is of course the file 403 * system's block size too. 404 */ 405 sfsp->f_frsize); /* not so surprisingly the 406 * "fundamental file system 407 * block size" is the frag 408 * size. 409 */ 410 (void)printf("%10" PRId64 " total blocks %10" PRId64 411 " free blocks %10" PRId64 " available\n", 412 (uint64_t)sfsp->f_blocks, (uint64_t)sfsp->f_bfree, 413 (uint64_t)sfsp->f_bavail); 414 (void)printf("%10" PRId64 " total files %10" PRId64 415 " free files %12lx filesys id\n", 416 (uint64_t)sfsp->f_ffree, (uint64_t)sfsp->f_files, 417 sfsp->f_fsid); 418 (void)printf("%10s fstype %#15lx flag %17ld filename " 419 "length\n", sfsp->f_fstypename, sfsp->f_flag, 420 sfsp->f_namemax); 421 (void)printf("%10lu owner %17" PRId64 " syncwrites %12" PRId64 422 " asyncwrites\n\n", (unsigned long)sfsp->f_owner, 423 sfsp->f_syncwrites, sfsp->f_asyncwrites); 424 425 /* 426 * a concession by the structured programming police to the 427 * indentation police.... 428 */ 429 return; 430 } 431 if (maxwidth < 12) 432 maxwidth = 12; 433 if (++timesthrough == 1) { 434 switch (blocksize = usize) { 435 case 1024: 436 header = Pflag ? "1024-blocks" : "1K-blocks"; 437 headerlen = (int)strlen(header); 438 break; 439 case 1024 * 1024: 440 header = "1M-blocks"; 441 headerlen = (int)strlen(header); 442 break; 443 case 1024 * 1024 * 1024: 444 header = "1G-blocks"; 445 headerlen = (int)strlen(header); 446 break; 447 default: 448 if (hflag) { 449 header = "Size"; 450 headerlen = (int)strlen(header); 451 blksize_width = 6; 452 } else 453 header = getbsize(&headerlen, &blocksize); 454 break; 455 } 456 457 if (blocksize >= 1024 * 1024) 458 blksize_width -= 3; 459 if (blocksize >= 1024 * 1024 * 1024) 460 blksize_width -= 3; 461 if (blksize_width < headerlen) 462 blksize_width = headerlen; 463 464 if (Pflag) { 465 /* 466 * either: 467 * "Filesystem 1024-blocks Used Available Capacity Mounted on\n" 468 * or: 469 * "Filesystem 512-blocks Used Available Capacity Mounted on\n" 470 */ 471 if (blocksize != 1024 && blocksize != 512) 472 errx(EXIT_FAILURE, 473 "non-standard block size incompatible with -P"); 474 (void)printf("Filesystem %s Used Available Capacity " 475 "Mounted on\n", header); 476 } else { 477 (void)printf("%-*.*s %*s %*s %*s %%Cap", 478 maxwidth, maxwidth, "Filesystem", 479 blksize_width, header, 480 blksize_width, "Used", 481 blksize_width, "Avail"); 482 if (iflag) { 483 (void)printf(" %*s %*s %%iCap", 484 WIDTH_INODE, "iUsed", 485 WIDTH_INODE, "iAvail"); 486 } 487 (void)printf(" Mounted on\n"); 488 } 489 } 490 used = sfsp->f_blocks - sfsp->f_bfree; 491 bavail = sfsp->f_bfree - sfsp->f_bresvd; 492 availblks = bavail + used; 493 if (Pflag) { 494 assert(hflag == 0); 495 assert(blocksize > 0); 496 /* 497 * "%s %d %d %d %s %s\n", <file system name>, <total space>, 498 * <space used>, <space free>, <percentage used>, 499 * <file system root> 500 */ 501 (void)printf("%s %" PRId64 " %" PRId64 " %" PRId64 " %s%% %s\n", 502 mntfromname, 503 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize), 504 fsbtoblk(used, sfsp->f_frsize, blocksize), 505 fsbtoblk(bavail, sfsp->f_frsize, blocksize), 506 availblks == 0 ? full : strspct(pb, sizeof(pb), used, 507 availblks, 0), sfsp->f_mntonname); 508 /* 509 * another concession by the structured programming police to 510 * the indentation police.... 511 * 512 * Note iflag cannot be set when Pflag is set. 513 */ 514 return; 515 } 516 517 (void)printf("%-*.*s ", maxwidth, maxwidth, mntfromname); 518 519 if (hflag) 520 prthuman(sfsp, used, bavail); 521 else 522 (void)printf("%*" PRId64 " %*" PRId64 " %*" PRId64, 523 blksize_width, 524 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize), 525 blksize_width, fsbtoblk(used, sfsp->f_frsize, blocksize), 526 blksize_width, fsbtoblk(bavail, sfsp->f_frsize, blocksize)); 527 (void)printf(" %3s%%", 528 availblks == 0 ? full : 529 strspct(pb, sizeof(pb), used, availblks, 0)); 530 if (iflag) { 531 inodes = sfsp->f_files; 532 used = inodes - sfsp->f_ffree; 533 (void)printf(" %*jd %*jd %4s%%", 534 WIDTH_INODE, (intmax_t)used, 535 WIDTH_INODE, (intmax_t)sfsp->f_ffree, 536 inodes == 0 ? (used == 0 ? empty : full) : 537 strspct(pb, sizeof(pb), used, inodes, 0)); 538 } 539 (void)printf(" %s\n", sfsp->f_mntonname); 540 } 541 542 static void 543 usage(void) 544 { 545 546 (void)fprintf(stderr, 547 "Usage: %s [-aglnW] [-Ghkm|-ihkm|-Pk] [-t type] [file | " 548 "file_system ...]\n", 549 getprogname()); 550 exit(1); 551 /* NOTREACHED */ 552 } 553
Indexes created Wed Oct 01 18:09:54 GMT 2025