df.c revision 1.96
1 /* $NetBSD: df.c,v 1.96 2020/08/21 16:40:02 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 1.96 2020/08/21 16:40:02 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 8 83 #define WIDTH_BLKSIZE 10 84 85 int 86 main(int argc, char *argv[]) 87 { 88 struct stat stbuf; 89 struct statvfs *mntbuf; 90 int ch, maxwidth, width; 91 size_t i, mntcount; 92 char *mntpt; 93 94 setprogname(argv[0]); 95 (void)setlocale(LC_ALL, ""); 96 97 while ((ch = getopt(argc, argv, "aGghiklmnPt:W")) != -1) 98 switch (ch) { 99 case 'a': 100 aflag = 1; 101 break; 102 case 'g': 103 hflag = 0; 104 usize = 1024 * 1024 * 1024; 105 break; 106 case 'G': 107 gflag = 1; 108 break; 109 case 'h': 110 hflag = 1; 111 usize = 0; 112 break; 113 case 'i': 114 iflag = 1; 115 break; 116 case 'k': 117 hflag = 0; 118 usize = 1024; 119 break; 120 case 'l': 121 lflag = 1; 122 break; 123 case 'm': 124 hflag = 0; 125 usize = 1024 * 1024; 126 break; 127 case 'n': 128 nflag = 1; 129 break; 130 case 'P': 131 Pflag = 1; 132 break; 133 case 'W': 134 Wflag = 1; 135 break; 136 case 't': 137 if (typelist != NULL) 138 errx(EXIT_FAILURE, 139 "only one -t option may be specified."); 140 maketypelist(optarg); 141 break; 142 case '?': 143 default: 144 usage(); 145 } 146 147 if (gflag && (Pflag || iflag)) 148 errx(EXIT_FAILURE, 149 "only one of -G and -P or -i may be specified"); 150 if (Pflag && iflag) 151 errx(EXIT_FAILURE, 152 "only one of -P and -i may be specified"); 153 #if 0 154 /* 155 * The block size cannot be checked until after getbsize() is called. 156 */ 157 if (Pflag && (hflag || (usize != 1024 && usize != 512))) 158 errx(EXIT_FAILURE, 159 "non-standard block size incompatible with -P"); 160 #endif 161 argc -= optind; 162 argv += optind; 163 164 mntcount = getmntinfo(&mntbuf, MNT_NOWAIT); 165 if (mntcount == 0) 166 err(EXIT_FAILURE, 167 "retrieving information on mounted file systems"); 168 169 if (*argv == NULL) { 170 mntcount = regetmntinfo(&mntbuf, mntcount); 171 } else { 172 if ((mntbuf = calloc(argc, sizeof(*mntbuf))) == NULL) 173 err(EXIT_FAILURE, "can't allocate statvfs array"); 174 mntcount = 0; 175 for (/*EMPTY*/; *argv != NULL; argv++) { 176 if (stat(*argv, &stbuf) < 0) { 177 if ((mntpt = getmntpt(*argv)) == 0) { 178 warn("%s", *argv); 179 continue; 180 } 181 } else if (S_ISBLK(stbuf.st_mode)) { 182 if ((mntpt = getmntpt(*argv)) == 0) 183 mntpt = *argv; 184 } else 185 mntpt = *argv; 186 /* 187 * Statfs does not take a `wait' flag, so we cannot 188 * implement nflag here. 189 */ 190 if (!statvfs(mntpt, &mntbuf[mntcount])) 191 if (lflag && 192 (mntbuf[mntcount].f_flag & MNT_LOCAL) == 0) 193 warnx("Warning: %s is not a local %s", 194 *argv, "file system"); 195 else if 196 (!selected(mntbuf[mntcount].f_fstypename, 197 sizeof(mntbuf[mntcount].f_fstypename))) 198 warnx("Warning: %s mounted as a %s %s", 199 *argv, 200 mntbuf[mntcount].f_fstypename, 201 "file system"); 202 else 203 ++mntcount; 204 else 205 warn("%s", *argv); 206 } 207 } 208 209 maxwidth = 0; 210 for (i = 0; i < mntcount; i++) { 211 width = (int)strlen(Wflag && mntbuf[i].f_mntfromlabel[0] ? 212 mntbuf[i].f_mntfromlabel : mntbuf[i].f_mntfromname); 213 if (width > maxwidth) 214 maxwidth = width; 215 } 216 for (i = 0; i < mntcount; i++) 217 prtstat(&mntbuf[i], maxwidth); 218 return 0; 219 } 220 221 static char * 222 getmntpt(const char *name) 223 { 224 size_t mntcount, i; 225 struct statvfs *mntbuf; 226 227 mntcount = getmntinfo(&mntbuf, MNT_NOWAIT); 228 if (mntcount == 0) 229 err(EXIT_FAILURE, "Can't get mount information"); 230 for (i = 0; i < mntcount; i++) { 231 if (!strcmp(mntbuf[i].f_mntfromname, name)) 232 return mntbuf[i].f_mntonname; 233 } 234 return 0; 235 } 236 237 static enum { IN_LIST, NOT_IN_LIST } which; 238 239 static int 240 selected(const char *type, size_t len) 241 { 242 char **av; 243 244 /* If no type specified, it's always selected. */ 245 if (typelist == NULL) 246 return 1; 247 for (av = typelist; *av != NULL; ++av) 248 if (!strncmp(type, *av, len)) 249 return which == IN_LIST ? 1 : 0; 250 return which == IN_LIST ? 0 : 1; 251 } 252 253 static void 254 maketypelist(char *fslist) 255 { 256 size_t i; 257 char *nextcp, **av; 258 259 if ((fslist == NULL) || (fslist[0] == '\0')) 260 errx(EXIT_FAILURE, "empty type list"); 261 262 /* 263 * XXX 264 * Note: the syntax is "noxxx,yyy" for no xxx's and 265 * no yyy's, not the more intuitive "noyyy,noyyy". 266 */ 267 if (fslist[0] == 'n' && fslist[1] == 'o') { 268 fslist += 2; 269 which = NOT_IN_LIST; 270 } else 271 which = IN_LIST; 272 273 /* Count the number of types. */ 274 for (i = 1, nextcp = fslist; 275 (nextcp = strchr(nextcp, ',')) != NULL; i++) 276 ++nextcp; 277 278 /* Build an array of that many types. */ 279 if ((av = typelist = calloc((i + 1), sizeof(*av))) == NULL) 280 err(EXIT_FAILURE, "can't allocate type array"); 281 av[0] = fslist; 282 for (i = 1, nextcp = fslist; 283 (nextcp = strchr(nextcp, ',')) != NULL; i++) { 284 *nextcp = '\0'; 285 av[i] = ++nextcp; 286 } 287 /* Terminate the array. */ 288 av[i] = NULL; 289 } 290 291 /* 292 * Make a pass over the filesystem info in ``mntbuf'' filtering out 293 * filesystem types not in ``fsmask'' and possibly re-stating to get 294 * current (not cached) info. Returns the new count of valid statvfs bufs. 295 */ 296 static size_t 297 regetmntinfo(struct statvfs **mntbufp, size_t mntcount) 298 { 299 size_t i, j; 300 struct statvfs *mntbuf; 301 302 if (!lflag && typelist == NULL && aflag) 303 return nflag ? mntcount : (size_t)getmntinfo(mntbufp, MNT_WAIT); 304 305 mntbuf = *mntbufp; 306 j = 0; 307 for (i = 0; i < mntcount; i++) { 308 if (!aflag && (mntbuf[i].f_flag & MNT_IGNORE) != 0) 309 continue; 310 if (lflag && (mntbuf[i].f_flag & MNT_LOCAL) == 0) 311 continue; 312 if (!selected(mntbuf[i].f_fstypename, 313 sizeof(mntbuf[i].f_fstypename))) 314 continue; 315 if (nflag) 316 mntbuf[j] = mntbuf[i]; 317 else { 318 struct statvfs layerbuf = mntbuf[i]; 319 (void)statvfs(mntbuf[i].f_mntonname, &mntbuf[j]); 320 /* 321 * If the FS name changed, then new data is for 322 * a different layer and we don't want it. 323 */ 324 if (memcmp(layerbuf.f_mntfromname, 325 mntbuf[j].f_mntfromname, MNAMELEN)) 326 mntbuf[j] = layerbuf; 327 } 328 j++; 329 } 330 return j; 331 } 332 333 static void 334 prthumanval(int64_t bytes, int width) 335 { 336 char buf[6]; 337 338 (void)humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1), 339 bytes, "", HN_AUTOSCALE, 340 HN_B | HN_NOSPACE | HN_DECIMAL); 341 342 (void)printf("%*s", width, buf); 343 } 344 345 static void 346 prthuman(const struct statvfs *sfsp, int64_t used, int64_t bavail) 347 { 348 349 prthumanval((int64_t)(sfsp->f_blocks * sfsp->f_frsize), WIDTH_BLKSIZE); 350 prthumanval((int64_t)(used * sfsp->f_frsize), 1 + WIDTH_BLKSIZE); 351 prthumanval((int64_t)(bavail * sfsp->f_frsize), 1 + WIDTH_BLKSIZE); 352 } 353 354 /* 355 * Convert statvfs returned filesystem size into BLOCKSIZE units. 356 * Attempts to avoid overflow for large filesystems. 357 */ 358 #define fsbtoblk(num, fsbs, bs) \ 359 (((fsbs) != 0 && (uint64_t)(fsbs) < (uint64_t)(bs)) ? \ 360 (int64_t)(num) / (int64_t)((bs) / (fsbs)) : \ 361 (int64_t)(num) * (int64_t)((fsbs) / (bs))) 362 363 /* 364 * Print out status about a filesystem. 365 */ 366 static void 367 prtstat(const struct statvfs *sfsp, int maxwidth) 368 { 369 static long blocksize; 370 static int headerlen, timesthrough; 371 static const char *header; 372 static const char full[] = "100"; 373 static const char empty[] = " 0"; 374 int64_t used, availblks, inodes; 375 int64_t bavail; 376 char pb[64]; 377 char mntfromname[sizeof(sfsp->f_mntfromname) + 10]; 378 379 if (Wflag && sfsp->f_mntfromlabel[0]) { 380 snprintf(mntfromname, sizeof(mntfromname), "NAME=%s", 381 sfsp->f_mntfromlabel); 382 } else { 383 strlcpy(mntfromname, sfsp->f_mntfromname, sizeof(mntfromname)); 384 } 385 386 if (gflag) { 387 /* 388 * From SunOS-5.6: 389 * 390 * /var (/dev/dsk/c0t0d0s3 ): 8192 block size 1024 frag size 391 * 984242 total blocks 860692 free blocks 859708 available 249984 total files 392 * 248691 free files 8388611 filesys id 393 * ufs fstype 0x00000004 flag 255 filename length 394 * 395 */ 396 (void)printf("%10s (%-12s): %7ld block size %12ld frag size\n", 397 sfsp->f_mntonname, mntfromname, 398 sfsp->f_bsize, /* On UFS/FFS systems this is 399 * also called the "optimal 400 * transfer block size" but it 401 * is of course the file 402 * system's block size too. 403 */ 404 sfsp->f_frsize); /* not so surprisingly the 405 * "fundamental file system 406 * block size" is the frag 407 * size. 408 */ 409 (void)printf("%10" PRId64 " total blocks %10" PRId64 410 " free blocks %10" PRId64 " available\n", 411 (uint64_t)sfsp->f_blocks, (uint64_t)sfsp->f_bfree, 412 (uint64_t)sfsp->f_bavail); 413 (void)printf("%10" PRId64 " total files %10" PRId64 414 " free files %12lx filesys id\n", 415 (uint64_t)sfsp->f_ffree, (uint64_t)sfsp->f_files, 416 sfsp->f_fsid); 417 (void)printf("%10s fstype %#15lx flag %17ld filename " 418 "length\n", sfsp->f_fstypename, sfsp->f_flag, 419 sfsp->f_namemax); 420 (void)printf("%10lu owner %17" PRId64 " syncwrites %12" PRId64 421 " asyncwrites\n\n", (unsigned long)sfsp->f_owner, 422 sfsp->f_syncwrites, sfsp->f_asyncwrites); 423 424 /* 425 * a concession by the structured programming police to the 426 * indentation police.... 427 */ 428 return; 429 } 430 if (maxwidth < 12) 431 maxwidth = 12; 432 if (++timesthrough == 1) { 433 switch (blocksize = usize) { 434 case 1024: 435 header = Pflag ? "1024-blocks" : "1K-blocks"; 436 headerlen = (int)strlen(header); 437 break; 438 case 1024 * 1024: 439 header = "1M-blocks"; 440 headerlen = (int)strlen(header); 441 break; 442 case 1024 * 1024 * 1024: 443 header = "1G-blocks"; 444 headerlen = (int)strlen(header); 445 break; 446 default: 447 if (hflag) { 448 header = "Size"; 449 headerlen = (int)strlen(header); 450 } else 451 header = getbsize(&headerlen, &blocksize); 452 break; 453 } 454 if (Pflag) { 455 /* 456 * either: 457 * "Filesystem 1024-blocks Used Available Capacity Mounted on\n" 458 * or: 459 * "Filesystem 512-blocks Used Available Capacity Mounted on\n" 460 */ 461 if (blocksize != 1024 && blocksize != 512) 462 errx(EXIT_FAILURE, 463 "non-standard block size incompatible with -P"); 464 (void)printf("Filesystem %s Used Available Capacity " 465 "Mounted on\n", header); 466 } else { 467 (void)printf("%-*.*s %*s %*s %*s %%Cap", 468 maxwidth, maxwidth, "Filesystem", 469 WIDTH_BLKSIZE, header, 470 WIDTH_BLKSIZE, "Used", 471 WIDTH_BLKSIZE, "Avail"); 472 if (iflag) { 473 (void)printf(" %*s %*s %%iCap", 474 WIDTH_INODE, "iUsed", 475 WIDTH_INODE, "iAvail"); 476 } 477 (void)printf(" Mounted on\n"); 478 } 479 } 480 used = sfsp->f_blocks - sfsp->f_bfree; 481 bavail = sfsp->f_bfree - sfsp->f_bresvd; 482 availblks = bavail + used; 483 if (Pflag) { 484 assert(hflag == 0); 485 assert(blocksize > 0); 486 /* 487 * "%s %d %d %d %s %s\n", <file system name>, <total space>, 488 * <space used>, <space free>, <percentage used>, 489 * <file system root> 490 */ 491 (void)printf("%s %" PRId64 " %" PRId64 " %" PRId64 " %s%% %s\n", 492 mntfromname, 493 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize), 494 fsbtoblk(used, sfsp->f_frsize, blocksize), 495 fsbtoblk(bavail, sfsp->f_frsize, blocksize), 496 availblks == 0 ? full : strspct(pb, sizeof(pb), used, 497 availblks, 0), sfsp->f_mntonname); 498 /* 499 * another concession by the structured programming police to 500 * the indentation police.... 501 * 502 * Note iflag cannot be set when Pflag is set. 503 */ 504 return; 505 } 506 507 (void)printf("%-*.*s ", maxwidth, maxwidth, mntfromname); 508 509 if (hflag) 510 prthuman(sfsp, used, bavail); 511 else 512 (void)printf("%*" PRId64 " %*" PRId64 " %*" PRId64, 513 WIDTH_BLKSIZE, 514 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize), 515 WIDTH_BLKSIZE, fsbtoblk(used, sfsp->f_frsize, blocksize), 516 WIDTH_BLKSIZE, fsbtoblk(bavail, sfsp->f_frsize, blocksize)); 517 (void)printf(" %3s%%", 518 availblks == 0 ? full : 519 strspct(pb, sizeof(pb), used, availblks, 0)); 520 if (iflag) { 521 inodes = sfsp->f_files; 522 used = inodes - sfsp->f_ffree; 523 (void)printf(" %*jd %*jd %4s%%", 524 WIDTH_INODE, (intmax_t)used, 525 WIDTH_INODE, (intmax_t)sfsp->f_ffree, 526 inodes == 0 ? (used == 0 ? empty : full) : 527 strspct(pb, sizeof(pb), used, inodes, 0)); 528 } 529 (void)printf(" %s\n", sfsp->f_mntonname); 530 } 531 532 static void 533 usage(void) 534 { 535 536 (void)fprintf(stderr, 537 "Usage: %s [-aglnW] [-Ghkm|-ihkm|-Pk] [-t type] [file | " 538 "file_system ...]\n", 539 getprogname()); 540 exit(1); 541 /* NOTREACHED */ 542 } 543
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