bin/df/df.c

   1 /*      $NetBSD: df.c,v 1.85 2009/01/25 14:18:21 lukem 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 1.85 2009/01/25 14:18:21 lukem 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
  67 extern char *strpct(u_long, u_long, u_int);
  68
  69 int      main(int, char *[]);
  70 int      bread(off_t, void *, int);
  71 char    *getmntpt(char *);
  72 void     prtstat(struct statvfs *, int);
  73 int      selected(const char *, size_t);
  74 void     maketypelist(char *);
  75 long     regetmntinfo(struct statvfs **, long);
  76 void     usage(void);
  77 void     prthumanval(int64_t, const char *);
  78 void     prthuman(struct statvfs *, int64_t, int64_t);
  79 const char *
  80         strpct64(uint64_t, uint64_t, u_int);
  81
  82 int     aflag, gflag, hflag, iflag, lflag, nflag, Pflag;
  83 long    usize = 0;
  84 char    **typelist = NULL;
  85
  86 int
  87 main(int argc, char *argv[])
  88 {
  89         struct stat stbuf;
  90         struct statvfs *mntbuf;
  91         long mntsize;
  92         int ch, i, maxwidth, width;
  93         char *mntpt;
  94
  95         setprogname(argv[0]);
  96         (void)setlocale(LC_ALL, "");
  97
  98         while ((ch = getopt(argc, argv, "aGghiklmnPt:")) != -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 't':
 135                         if (typelist != NULL)
 136                                 errx(EXIT_FAILURE,
 137                                     "only one -t option may be specified.");
 138                         maketypelist(optarg);
 139                         break;
 140                 case '?':
 141                 default:
 142                         usage();
 143                 }
 144
 145         if (gflag && (Pflag || iflag))
 146                 errx(EXIT_FAILURE,
 147                     "only one of -G and -P or -i may be specified");
 148         if (Pflag && iflag)
 149                 errx(EXIT_FAILURE,
 150                     "only one of -P and -i may be specified");
 151 #if 0
 152         /*
 153          * The block size cannot be checked until after getbsize() is called.
 154          */
 155         if (Pflag && (hflag || (usize != 1024 && usize != 512)))
 156                 errx(EXIT_FAILURE,
 157                     "non-standard block size incompatible with -P");
 158 #endif
 159         argc -= optind;
 160         argv += optind;
 161
 162         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 163         if (mntsize == 0)
 164                 err(EXIT_FAILURE,
 165                     "retrieving information on mounted file systems");
 166
 167         if (*argv == NULL) {
 168                 mntsize = regetmntinfo(&mntbuf, mntsize);
 169         } else {
 170                 if ((mntbuf = malloc(argc * sizeof(*mntbuf))) == NULL)
 171                         err(EXIT_FAILURE, "can't allocate statvfs array");
 172                 mntsize = 0;
 173                 for (/*EMPTY*/; *argv != NULL; argv++) {
 174                         if (stat(*argv, &stbuf) < 0) {
 175                                 if ((mntpt = getmntpt(*argv)) == 0) {
 176                                         warn("%s", *argv);
 177                                         continue;
 178                                 }
 179                         } else if (S_ISBLK(stbuf.st_mode)) {
 180                                 if ((mntpt = getmntpt(*argv)) == 0)
 181                                         mntpt = *argv;
 182                         } else
 183                                 mntpt = *argv;
 184                         /*
 185                          * Statfs does not take a `wait' flag, so we cannot
 186                          * implement nflag here.
 187                          */
 188                         if (!statvfs(mntpt, &mntbuf[mntsize]))
 189                                 if (lflag &&
 190                                     (mntbuf[mntsize].f_flag & MNT_LOCAL) == 0)
 191                                         warnx("Warning: %s is not a local %s",
 192                                             *argv, "file system");
 193                                 else if
 194                                     (!selected(mntbuf[mntsize].f_fstypename,
 195                                         sizeof(mntbuf[mntsize].f_fstypename)))
 196                                         warnx("Warning: %s mounted as a %s %s",
 197                                             *argv,
 198                                             mntbuf[mntsize].f_fstypename,
 199                                             "file system");
 200                                 else
 201                                         ++mntsize;
 202                         else
 203                                 warn("%s", *argv);
 204                 }
 205         }
 206
 207         maxwidth = 0;
 208         for (i = 0; i < mntsize; i++) {
 209                 width = (int)strlen(mntbuf[i].f_mntfromname);
 210                 if (width > maxwidth)
 211                         maxwidth = width;
 212         }
 213         for (i = 0; i < mntsize; i++)
 214                 prtstat(&mntbuf[i], maxwidth);
 215         exit(0);
 216         /* NOTREACHED */
 217 }
 218
 219 char *
 220 getmntpt(char *name)
 221 {
 222         long mntsize, i;
 223         struct statvfs *mntbuf;
 224
 225         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 226         for (i = 0; i < mntsize; i++) {
 227                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 228                         return (mntbuf[i].f_mntonname);
 229         }
 230         return (0);
 231 }
 232
 233 static enum { IN_LIST, NOT_IN_LIST } which;
 234
 235 int
 236 selected(const char *type, size_t len)
 237 {
 238         char **av;
 239
 240         /* If no type specified, it's always selected. */
 241         if (typelist == NULL)
 242                 return (1);
 243         for (av = typelist; *av != NULL; ++av)
 244                 if (!strncmp(type, *av, len))
 245                         return (which == IN_LIST ? 1 : 0);
 246         return (which == IN_LIST ? 0 : 1);
 247 }
 248
 249 void
 250 maketypelist(char *fslist)
 251 {
 252         int i;
 253         char *nextcp, **av;
 254
 255         if ((fslist == NULL) || (fslist[0] == '\0'))
 256                 errx(EXIT_FAILURE, "empty type list");
 257
 258         /*
 259          * XXX
 260          * Note: the syntax is "noxxx,yyy" for no xxx's and
 261          * no yyy's, not the more intuitive "noyyy,noyyy".
 262          */
 263         if (fslist[0] == 'n' && fslist[1] == 'o') {
 264                 fslist += 2;
 265                 which = NOT_IN_LIST;
 266         } else
 267                 which = IN_LIST;
 268
 269         /* Count the number of types. */
 270         for (i = 1, nextcp = fslist;
 271             (nextcp = strchr(nextcp, ',')) != NULL; i++)
 272                 ++nextcp;
 273
 274         /* Build an array of that many types. */
 275         if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL)
 276                 err(EXIT_FAILURE, "can't allocate type array");
 277         av[0] = fslist;
 278         for (i = 1, nextcp = fslist;
 279             (nextcp = strchr(nextcp, ',')) != NULL; i++) {
 280                 *nextcp = '\0';
 281                 av[i] = ++nextcp;
 282         }
 283         /* Terminate the array. */
 284         av[i] = NULL;
 285 }
 286
 287 /*
 288  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 289  * filesystem types not in ``fsmask'' and possibly re-stating to get
 290  * current (not cached) info.  Returns the new count of valid statvfs bufs.
 291  */
 292 long
 293 regetmntinfo(struct statvfs **mntbufp, long mntsize)
 294 {
 295         int i, j;
 296         struct statvfs *mntbuf;
 297
 298         if (!lflag && typelist == NULL && aflag)
 299                 return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
 300
 301         mntbuf = *mntbufp;
 302         j = 0;
 303         for (i = 0; i < mntsize; i++) {
 304                 if (!aflag && (mntbuf[i].f_flag & MNT_IGNORE) != 0)
 305                         continue;
 306                 if (lflag && (mntbuf[i].f_flag & MNT_LOCAL) == 0)
 307                         continue;
 308                 if (!selected(mntbuf[i].f_fstypename,
 309                     sizeof(mntbuf[i].f_fstypename)))
 310                         continue;
 311                 if (nflag)
 312                         mntbuf[j] = mntbuf[i];
 313                 else {
 314                         struct statvfs layerbuf = mntbuf[i];
 315                         (void)statvfs(mntbuf[i].f_mntonname, &mntbuf[j]);
 316                         /*
 317                          * If the FS name changed, then new data is for
 318                          * a different layer and we don't want it.
 319                          */
 320                         if (memcmp(layerbuf.f_mntfromname,
 321                             mntbuf[j].f_mntfromname, MNAMELEN))
 322                                 mntbuf[j] = layerbuf;
 323                 }
 324                 j++;
 325         }
 326         return (j);
 327 }
 328
 329 void
 330 prthumanval(int64_t bytes, const char *pad)
 331 {
 332         char buf[6];
 333
 334         (void)humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 335             bytes, "", HN_AUTOSCALE,
 336             HN_B | HN_NOSPACE | HN_DECIMAL);
 337
 338         (void)printf("%s %6s", pad, buf);
 339 }
 340
 341 void
 342 prthuman(struct statvfs *sfsp, int64_t used, int64_t bavail)
 343 {
 344
 345         prthumanval((int64_t)(sfsp->f_blocks * sfsp->f_frsize), "  ");
 346         prthumanval((int64_t)(used * sfsp->f_frsize), "    ");
 347         prthumanval((int64_t)(bavail * sfsp->f_frsize), "    ");
 348 }
 349
 350 /*
 351  * Convert statvfs returned filesystem size into BLOCKSIZE units.
 352  * Attempts to avoid overflow for large filesystems.
 353  */
 354 #define fsbtoblk(num, fsbs, bs)                                 \
 355         (((fsbs) != 0 && (uint64_t)(fsbs) < (uint64_t)(bs)) ?   \
 356             (int64_t)(num) / (int64_t)((bs) / (fsbs)) :         \
 357             (int64_t)(num) * (int64_t)((fsbs) / (bs)))
 358
 359 /*
 360  * Print out status about a filesystem.
 361  */
 362 void
 363 prtstat(struct statvfs *sfsp, int maxwidth)
 364 {
 365         static long blocksize;
 366         static int headerlen, timesthrough;
 367         static const char *header;
 368         static const char full[] = "100%";
 369         static const char empty[] = "  0%";
 370         int64_t used, availblks, inodes;
 371         int64_t bavail;
 372
 373         if (gflag) {
 374                 /*
 375                  * From SunOS-5.6:
 376                  *
 377                  * /var               (/dev/dsk/c0t0d0s3 ):         8192 block size          1024 frag size
 378                  *   984242 total blocks     860692 free blocks   859708 available         249984 total files
 379                  *   248691 free files      8388611 filesys id
 380                  *      ufs fstype       0x00000004 flag             255 filename length
 381                  *
 382                  */
 383                 (void)printf("%10s (%-12s): %7ld block size %12ld frag size\n",
 384                     sfsp->f_mntonname, sfsp->f_mntfromname,
 385                     sfsp->f_iosize,     /* On UFS/FFS systems this is
 386                                          * also called the "optimal
 387                                          * transfer block size" but it
 388                                          * is of course the file
 389                                          * system's block size too.
 390                                          */
 391                     sfsp->f_bsize);     /* not so surprisingly the
 392                                          * "fundamental file system
 393                                          * block size" is the frag
 394                                          * size.
 395                                          */
 396                 (void)printf("%10" PRId64 " total blocks %10" PRId64
 397                     " free blocks  %10" PRId64 " available\n",
 398                     (uint64_t)sfsp->f_blocks, (uint64_t)sfsp->f_bfree,
 399                     (uint64_t)sfsp->f_bavail);
 400                 (void)printf("%10" PRId64 " total files  %10" PRId64
 401                     " free files %12lx filesys id\n",
 402                     (uint64_t)sfsp->f_ffree, (uint64_t)sfsp->f_files,
 403                     sfsp->f_fsid);
 404                 (void)printf("%10s fstype  %#15lx flag  %17ld filename "
 405                     "length\n", sfsp->f_fstypename, sfsp->f_flag,
 406                     sfsp->f_namemax);
 407                 (void)printf("%10lu owner %17" PRId64 " syncwrites %12" PRId64
 408                     " asyncwrites\n\n", (unsigned long)sfsp->f_owner,
 409                     sfsp->f_syncwrites, sfsp->f_asyncwrites);
 410
 411                 /*
 412                  * a concession by the structured programming police to the
 413                  * indentation police....
 414                  */
 415                 return;
 416         }
 417         if (maxwidth < 12)
 418                 maxwidth = 12;
 419         if (++timesthrough == 1) {
 420                 switch (blocksize = usize) {
 421                 case 1024:
 422                         header = Pflag ? "1024-blocks" : "1K-blocks";
 423                         headerlen = (int)strlen(header);
 424                         break;
 425                 case 1024 * 1024:
 426                         header = "1M-blocks";
 427                         headerlen = (int)strlen(header);
 428                         break;
 429                 case 1024 * 1024 * 1024:
 430                         header = "1G-blocks";
 431                         headerlen = (int)strlen(header);
 432                         break;
 433                 default:
 434                         if (hflag) {
 435                                 header = "Size";
 436                                 headerlen = (int)strlen(header);
 437                         } else
 438                                 header = getbsize(&headerlen, &blocksize);
 439                         break;
 440                 }
 441                 if (Pflag) {
 442                         /*
 443                          * either:
 444                          *  "Filesystem 1024-blocks Used Available Capacity Mounted on\n"
 445                          * or:
 446                          *  "Filesystem 512-blocks Used Available Capacity Mounted on\n"
 447                          */
 448                         if (blocksize != 1024 && blocksize != 512)
 449                                 errx(EXIT_FAILURE,
 450                                     "non-standard block size incompatible with -P");
 451                         (void)printf("Filesystem %s Used Available Capacity "
 452                             "Mounted on\n", header);
 453                 } else {
 454                         (void)printf("%-*.*s %s       Used      Avail %%Cap",
 455                             maxwidth - (headerlen - 9),
 456                             maxwidth - (headerlen - 9),
 457                             "Filesystem", header);
 458                         if (iflag)
 459                                 (void)printf("    iUsed   iAvail %%iCap");
 460                         (void)printf(" Mounted on\n");
 461                 }
 462         }
 463         used = sfsp->f_blocks - sfsp->f_bfree;
 464         bavail = sfsp->f_bfree - sfsp->f_bresvd;
 465         availblks = bavail + used;
 466         if (Pflag) {
 467                 assert(hflag == 0);
 468                 assert(blocksize > 0);
 469                 /*
 470                  * "%s %d %d %d %s %s\n", <file system name>, <total space>,
 471                  * <space used>, <space free>, <percentage used>,
 472                  * <file system root>
 473                  */
 474                 (void)printf("%s %" PRId64 " %" PRId64 " %" PRId64 " %s %s\n",
 475                     sfsp->f_mntfromname,
 476                     fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize),
 477                     fsbtoblk(used, sfsp->f_frsize, blocksize),
 478                     fsbtoblk(bavail, sfsp->f_frsize, blocksize),
 479                     availblks == 0 ? full : strpct64((uint64_t) used,
 480                     (uint64_t) availblks, 0), sfsp->f_mntonname);
 481                 /*
 482                  * another concession by the structured programming police to
 483                  * the indentation police....
 484                  *
 485                  * Note iflag cannot be set when Pflag is set.
 486                  */
 487                 return;
 488         }
 489
 490         (void)printf("%-*.*s ", maxwidth, maxwidth, sfsp->f_mntfromname);
 491
 492         if (hflag)
 493                 prthuman(sfsp, used, bavail);
 494         else
 495                 (void)printf("%10" PRId64 " %10" PRId64 " %10" PRId64,
 496                     fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize),
 497                     fsbtoblk(used, sfsp->f_frsize, blocksize),
 498                     fsbtoblk(bavail, sfsp->f_frsize, blocksize));
 499         (void)printf(" %4s",
 500             availblks == 0 ? full :
 501             /* We know that these values are never negative */
 502             strpct64((uint64_t)used, (uint64_t)availblks, 0));
 503         if (iflag) {
 504                 inodes = sfsp->f_files;
 505                 used = inodes - sfsp->f_ffree;
 506                 (void)printf(" %8jd %8jd %4s",
 507                     (intmax_t)used, (intmax_t)sfsp->f_ffree,
 508                     inodes == 0 ? (used == 0 ? empty : full) :
 509                     strpct64((uint64_t)used, (uint64_t)inodes, 0));
 510         }
 511         (void)printf(" %s\n", sfsp->f_mntonname);
 512 }
 513
 514 void
 515 usage(void)
 516 {
 517
 518         (void)fprintf(stderr,
 519             "Usage: %s [-aGgln] [-hkm|-ihkm|-Pk] [-t type] [file | "
 520             "file_system ...]\n",
 521             getprogname());
 522         exit(1);
 523         /* NOTREACHED */
 524 }
 525
 526 const char *
 527 strpct64(uint64_t numerator, uint64_t denominator, u_int digits)
 528 {
 529
 530         while (denominator > ULONG_MAX) {
 531                 numerator >>= 1;
 532                 denominator >>= 1;
 533         }
 534         return (strpct((u_long)numerator, (u_long)denominator, digits));
 535 }