bin/df/df.c

   1 /*
   2  * Copyright (c) 1980, 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * @(#) Copyright (c) 1980, 1990, 1993, 1994 The Regents of the University of California.  All rights reserved.
  35  * @(#)df.c     8.9 (Berkeley) 5/8/95
  36  * $FreeBSD: src/bin/df/df.c,v 1.23.2.9 2002/07/01 00:14:24 iedowse Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/stat.h>
  41 #include <sys/mount.h>
  42 #include <sys/sysctl.h>
  43 #include <sys/statvfs.h>
  44
  45 #include <vfs/ufs/dinode.h>
  46 #include <vfs/ufs/ufsmount.h>
  47
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #include <fstab.h>
  52 #include <libutil.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <sysexits.h>
  57 #include <unistd.h>
  58
  59 #define UNITS_SI 1
  60 #define UNITS_2 2
  61
  62 #ifndef HN_FRACTIONAL
  63 #define HN_FRACTIONAL   HN_DECIMAL
  64 #endif
  65
  66 /* Maximum widths of various fields. */
  67 struct maxwidths {
  68         int mntfrom;
  69         int fstype;
  70         int total;
  71         int used;
  72         int avail;
  73         int iused;
  74         int ifree;
  75 };
  76
  77 /* vfslist.c */
  78 char    **makevfslist(char *);
  79 int       checkvfsname(const char *, char **);
  80
  81 static char     *getmntpt(char *);
  82 static int       quadwidth(int64_t);
  83 static char     *makenetvfslist(void);
  84 static void      prthuman(struct statvfs *, int64_t);
  85 static void      prthumanval(int64_t);
  86 static void      prtstat(struct statfs *, struct statvfs *, struct maxwidths *);
  87 static long      regetmntinfo(struct statfs **, struct statvfs **, long, char **);
  88 static void      update_maxwidths(struct maxwidths *, struct statfs *, struct statvfs *);
  89 static void      usage(void);
  90
  91 int     aflag = 0, hflag, iflag, nflag, Tflag;
  92 struct  ufs_args mdev;
  93
  94 static __inline int
  95 imax(int a, int b)
  96 {
  97         return (a > b ? a : b);
  98 }
  99
 100 static __inline int64_t
 101 qmax(int64_t a, int64_t b)
 102 {
 103         return (a > b ? a : b);
 104 }
 105
 106 int
 107 main(int argc, char **argv)
 108 {
 109         struct stat stbuf;
 110         struct statfs statfsbuf, *mntbuf;
 111         struct statvfs statvfsbuf, *mntvbuf;
 112         struct maxwidths maxwidths;
 113         const char *fstype;
 114         char *mntpath, *mntpt, **vfslist;
 115         long mntsize;
 116         int ch, i, rv;
 117
 118         fstype = "ufs";
 119
 120         vfslist = NULL;
 121         while ((ch = getopt(argc, argv, "abgHhiklmnPt:T")) != -1)
 122                 switch (ch) {
 123                 case 'a':
 124                         aflag = 1;
 125                         break;
 126                 case 'b':
 127                                 /* FALLTHROUGH */
 128                 case 'P':
 129                         if (setenv("BLOCKSIZE", "512", 1) != 0)
 130                                 warn("setenv: cannot set BLOCKSIZE=512");
 131                         hflag = 0;
 132                         break;
 133                 case 'g':
 134                         if (setenv("BLOCKSIZE", "1g", 1) != 0)
 135                                 warn("setenv: cannot set BLOCKSIZE=1g");
 136                         hflag = 0;
 137                         break;
 138                 case 'H':
 139                         hflag = UNITS_SI;
 140                         break;
 141                 case 'h':
 142                         hflag = UNITS_2;
 143                         break;
 144                 case 'i':
 145                         iflag = 1;
 146                         break;
 147                 case 'k':
 148                         if (setenv("BLOCKSIZE", "1k", 1) != 0)
 149                                 warn("setenv: cannot set BLOCKSIZE=1k");
 150                         hflag = 0;
 151                         break;
 152                 case 'l':
 153                         if (vfslist != NULL)
 154                                 errx(1, "-l and -t are mutually exclusive.");
 155                         vfslist = makevfslist(makenetvfslist());
 156                         break;
 157                 case 'm':
 158                         if (setenv("BLOCKSIZE", "1m", 1) != 0)
 159                                 warn("setenv: cannot set BLOCKSIZE=1m");
 160                         hflag = 0;
 161                         break;
 162                 case 'n':
 163                         nflag = 1;
 164                         break;
 165                 case 't':
 166                         if (vfslist != NULL)
 167                                 errx(1, "only one -t option may be specified");
 168                         fstype = optarg;
 169                         vfslist = makevfslist(optarg);
 170                         break;
 171                 case 'T':
 172                         Tflag = 1;
 173                         break;
 174                 case '?':
 175                 default:
 176                         usage();
 177                 }
 178         argc -= optind;
 179         argv += optind;
 180
 181         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 182         bzero(&maxwidths, sizeof(maxwidths));
 183         for (i = 0; i < mntsize; i++)
 184                 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 185
 186         rv = 0;
 187         if (!*argv) {
 188                 mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist);
 189                 bzero(&maxwidths, sizeof(maxwidths));
 190                 for (i = 0; i < mntsize; i++)
 191                         update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 192                 for (i = 0; i < mntsize; i++) {
 193                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 194                                 prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths);
 195                 }
 196                 exit(rv);
 197         }
 198
 199         for (; *argv; argv++) {
 200                 if (stat(*argv, &stbuf) < 0) {
 201                         if ((mntpt = getmntpt(*argv)) == NULL) {
 202                                 warn("%s", *argv);
 203                                 rv = 1;
 204                                 continue;
 205                         }
 206                 } else if (S_ISCHR(stbuf.st_mode)) {
 207                         if ((mntpt = getmntpt(*argv)) == NULL) {
 208                                 mdev.fspec = *argv;
 209                                 mntpath = strdup("/tmp/df.XXXXXX");
 210                                 if (mntpath == NULL) {
 211                                         warn("strdup failed");
 212                                         rv = 1;
 213                                         continue;
 214                                 }
 215                                 mntpt = mkdtemp(mntpath);
 216                                 if (mntpt == NULL) {
 217                                         warn("mkdtemp(\"%s\") failed", mntpath);
 218                                         rv = 1;
 219                                         free(mntpath);
 220                                         continue;
 221                                 }
 222                                 if (mount(fstype, mntpt, MNT_RDONLY,
 223                                     &mdev) != 0) {
 224                                         warn("%s", *argv);
 225                                         rv = 1;
 226                                         rmdir(mntpt);
 227                                         free(mntpath);
 228                                         continue;
 229                                 } else if (statfs(mntpt, &statfsbuf) == 0 &&
 230                                            statvfs(mntpt, &statvfsbuf) == 0) {
 231                                         statfsbuf.f_mntonname[0] = '\0';
 232                                         prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 233                                 } else {
 234                                         warn("%s", *argv);
 235                                         rv = 1;
 236                                 }
 237                                 unmount(mntpt, 0);
 238                                 rmdir(mntpt);
 239                                 free(mntpath);
 240                                 continue;
 241                         }
 242                 } else
 243                         mntpt = *argv;
 244                 /*
 245                  * Statfs does not take a `wait' flag, so we cannot
 246                  * implement nflag here.
 247                  */
 248                 if (statfs(mntpt, &statfsbuf) < 0) {
 249                         warn("%s", mntpt);
 250                         rv = 1;
 251                         continue;
 252                 }
 253                 if (statvfs(mntpt, &statvfsbuf) < 0) {
 254                         warn("%s", mntpt);
 255                         rv = 1;
 256                         continue;
 257                 }
 258                 /*
 259                  * Check to make sure the arguments we've been given are
 260                  * satisfied. Return an error if we have been asked to
 261                  * list a mount point that does not match the other args
 262                  * we've been given (-l, -t, etc.).
 263                  */
 264                 if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
 265                         rv = 1;
 266                         continue;
 267                 }
 268
 269                 if (argc == 1) {
 270                         bzero(&maxwidths, sizeof(maxwidths));
 271                         update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf);
 272                 }
 273                 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 274         }
 275         return (rv);
 276 }
 277
 278 static char *
 279 getmntpt(char *name)
 280 {
 281         long mntsize, i;
 282         struct statfs *mntbuf;
 283         struct statvfs *mntvbuf;
 284
 285         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 286         for (i = 0; i < mntsize; i++) {
 287                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 288                         return (mntbuf[i].f_mntonname);
 289         }
 290         return (0);
 291 }
 292
 293 /*
 294  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 295  * filesystem types not in vfslist and possibly re-stating to get
 296  * current (not cached) info.  Returns the new count of valid statfs bufs.
 297  */
 298 static long
 299 regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist)
 300 {
 301         int i, j;
 302         struct statfs *mntbuf;
 303         struct statvfs *mntvbuf;
 304
 305         if (vfslist == NULL)
 306                 return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT));
 307
 308         mntbuf = *mntbufp;
 309         mntvbuf = *mntvbufp;
 310         for (j = 0, i = 0; i < mntsize; i++) {
 311                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 312                         continue;
 313                 if (!nflag) {
 314                         statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 315                         statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]);
 316                 } else if (i != j) {
 317                         mntbuf[j] = mntbuf[i];
 318                         mntvbuf[j] = mntvbuf[i];
 319                 }
 320                 j++;
 321         }
 322         return (j);
 323 }
 324
 325 static void
 326 prthuman(struct statvfs *vsfsp, int64_t used)
 327 {
 328         prthumanval(vsfsp->f_blocks * vsfsp->f_bsize);
 329         prthumanval(used * vsfsp->f_bsize);
 330         prthumanval(vsfsp->f_bavail * vsfsp->f_bsize);
 331 }
 332
 333 static void
 334 prthumanval(int64_t bytes)
 335 {
 336         char buf[7];
 337         int flags;
 338
 339         flags = HN_B | HN_NOSPACE | HN_FRACTIONAL;
 340         if (hflag == UNITS_SI)
 341                 flags |= HN_DIVISOR_1000;
 342
 343         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 344             bytes, "", HN_AUTOSCALE, flags);
 345
 346         printf(" %6s", buf);
 347 }
 348
 349 /*
 350  * Print an inode count in "human-readable" format.
 351  */
 352 static void
 353 prthumanvalinode(int64_t bytes)
 354 {
 355         char buf[6];
 356         int flags;
 357
 358         flags = HN_NOSPACE | HN_FRACTIONAL | HN_DIVISOR_1000;
 359
 360         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 361             bytes, "", HN_AUTOSCALE, flags);
 362
 363         printf(" %5s", buf);
 364 }
 365
 366 /*
 367  * Convert statfs returned filesystem size into BLOCKSIZE units.
 368  * Attempts to avoid overflow for large filesystems.
 369  */
 370 static intmax_t
 371 fsbtoblk(int64_t num, uint64_t bsize, u_long reqbsize)
 372 {
 373         if (bsize != 0 && bsize < reqbsize)
 374                 return (num / (intmax_t)(reqbsize / bsize));
 375         else
 376                 return (num * (intmax_t)(bsize / reqbsize));
 377 }
 378
 379 /*
 380  * Print out status about a filesystem.
 381  */
 382 static void
 383 prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp)
 384 {
 385         static long blocksize;
 386         static int headerlen, timesthrough;
 387         static const char *header;
 388         int64_t used, availblks, inodes;
 389
 390         if (++timesthrough == 1) {
 391                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 392                 mwp->fstype = imax(mwp->fstype, strlen("Type"));
 393                 if (hflag) {
 394                         header = "  Size";
 395                         mwp->total = mwp->used = mwp->avail = strlen(header);
 396                 } else {
 397                         header = getbsize(&headerlen, &blocksize);
 398                         mwp->total = imax(mwp->total, headerlen);
 399                 }
 400                 mwp->used = imax(mwp->used, strlen("Used"));
 401                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 402
 403                 printf("%-*s", mwp->mntfrom, "Filesystem");
 404                 if (Tflag)
 405                         printf("  %-*s", mwp->fstype, "Type");
 406                 printf(" %-*s %*s %*s Capacity", mwp->total, header, mwp->used,
 407                     "Used", mwp->avail, "Avail");
 408                 if (iflag) {
 409                         mwp->iused = imax(hflag ? 0 : mwp->iused,
 410                             (int)strlen("  iused"));
 411                         mwp->ifree = imax(hflag ? 0 : mwp->ifree,
 412                             (int)strlen("ifree"));
 413                         printf(" %*s %*s %%iused", mwp->iused - 2,
 414                             "iused", mwp->ifree, "ifree");
 415                 }
 416                 printf("  Mounted on\n");
 417         }
 418         printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 419         if (Tflag)
 420                 printf("  %-*s", mwp->fstype, sfsp->f_fstypename);
 421         used = vsfsp->f_blocks - vsfsp->f_bfree;
 422         availblks = vsfsp->f_bavail + used;
 423         if (hflag) {
 424                 prthuman(vsfsp, used);
 425         } else {
 426                 printf(" %*jd %*jd %*jd", mwp->total,
 427                     fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize),
 428                     mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize),
 429                     mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize,
 430                     blocksize));
 431         }
 432         printf(" %5.0f%%",
 433             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 434         if (iflag) {
 435                 inodes = vsfsp->f_files;
 436                 used = inodes - vsfsp->f_ffree;
 437                 if (hflag) {
 438                         printf("  ");
 439                         prthumanvalinode(used);
 440                         prthumanvalinode(vsfsp->f_ffree);
 441                 } else {
 442                         printf(" %*jd %*jd", mwp->iused, (intmax_t)used,
 443                             mwp->ifree, (intmax_t)vsfsp->f_ffree);
 444                 }
 445                 printf(" %4.0f%% ", inodes == 0 ? 100.0 :
 446                     (double)used / (double)inodes * 100.0);
 447         } else
 448                 printf("  ");
 449         printf("  %s\n", sfsp->f_mntonname);
 450 }
 451
 452 /*
 453  * Update the maximum field-width information in `mwp' based on
 454  * the filesystem specified by `sfsp'.
 455  */
 456 static void
 457 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp)
 458 {
 459         static long blocksize;
 460         int dummy;
 461
 462         if (blocksize == 0)
 463                 getbsize(&dummy, &blocksize);
 464
 465         mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
 466         mwp->fstype = imax(mwp->fstype, strlen(sfsp->f_fstypename));
 467         mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks,
 468             vsfsp->f_bsize, blocksize)));
 469         mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks -
 470             vsfsp->f_bfree, vsfsp->f_bsize, blocksize)));
 471         mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail,
 472             vsfsp->f_bsize, blocksize)));
 473         mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files -
 474             vsfsp->f_ffree));
 475         mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree));
 476 }
 477
 478 /* Return the width in characters of the specified long. */
 479 static int
 480 quadwidth(int64_t val)
 481 {
 482         int len;
 483
 484         len = 0;
 485         /* Negative or zero values require one extra digit. */
 486         if (val <= 0) {
 487                 val = -val;
 488                 len++;
 489         }
 490         while (val > 0) {
 491                 len++;
 492                 val /= 10;
 493         }
 494         return (len);
 495 }
 496
 497 static void
 498 usage(void)
 499 {
 500
 501         fprintf(stderr,
 502             "usage: df [-b | -H | -h | -k | -m | -P] [-ailnT] [-t type] [file | filesystem ...]\n");
 503         exit(EX_USAGE);
 504 }
 505
 506 static char *
 507 makenetvfslist(void)
 508 {
 509         char *str, *strptr, **listptr;
 510         int mib[3], maxvfsconf, cnt=0, i;
 511         size_t miblen;
 512         struct ovfsconf *ptr;
 513
 514         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 515         miblen=sizeof(maxvfsconf);
 516         if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
 517             &maxvfsconf, &miblen, NULL, 0)) {
 518                 warnx("sysctl failed");
 519                 return (NULL);
 520         }
 521
 522         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 523                 warnx("malloc failed");
 524                 return (NULL);
 525         }
 526
 527         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 528                 if (ptr->vfc_flags & VFCF_NETWORK) {
 529                         listptr[cnt++] = strdup(ptr->vfc_name);
 530                         if (listptr[cnt-1] == NULL) {
 531                                 warnx("malloc failed");
 532                                 free(listptr);
 533                                 return (NULL);
 534                         }
 535                 }
 536
 537         if (cnt == 0 ||
 538             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 539                 if (cnt > 0)
 540                         warnx("malloc failed");
 541                 free(listptr);
 542                 return (NULL);
 543         }
 544
 545         *str = 'n'; *(str + 1) = 'o';
 546         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 547                 strncpy(strptr, listptr[i], 32);
 548                 strptr += strlen(listptr[i]);
 549                 *strptr = ',';
 550                 free(listptr[i]);
 551         }
 552         *(--strptr) = '\0';
 553
 554         free(listptr);
 555         return (str);
 556 }