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 static int      aflag = 0, hflag, iflag, nflag, Tflag;
  92 static 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 int
 101 main(int argc, char **argv)
 102 {
 103         struct stat stbuf;
 104         struct statfs statfsbuf, *mntbuf;
 105         struct statvfs statvfsbuf, *mntvbuf;
 106         struct maxwidths maxwidths;
 107         const char *fstype;
 108         char *mntpath, *mntpt, **vfslist;
 109         long mntsize;
 110         int ch, i, rv;
 111
 112         fstype = "ufs";
 113
 114         vfslist = NULL;
 115         while ((ch = getopt(argc, argv, "abgHhiklmnPt:T")) != -1)
 116                 switch (ch) {
 117                 case 'a':
 118                         aflag = 1;
 119                         break;
 120                 case 'b':
 121                                 /* FALLTHROUGH */
 122                 case 'P':
 123                         if (setenv("BLOCKSIZE", "512", 1) != 0)
 124                                 warn("setenv: cannot set BLOCKSIZE=512");
 125                         hflag = 0;
 126                         break;
 127                 case 'g':
 128                         if (setenv("BLOCKSIZE", "1g", 1) != 0)
 129                                 warn("setenv: cannot set BLOCKSIZE=1g");
 130                         hflag = 0;
 131                         break;
 132                 case 'H':
 133                         hflag = UNITS_SI;
 134                         break;
 135                 case 'h':
 136                         hflag = UNITS_2;
 137                         break;
 138                 case 'i':
 139                         iflag = 1;
 140                         break;
 141                 case 'k':
 142                         if (setenv("BLOCKSIZE", "1k", 1) != 0)
 143                                 warn("setenv: cannot set BLOCKSIZE=1k");
 144                         hflag = 0;
 145                         break;
 146                 case 'l':
 147                         if (vfslist != NULL)
 148                                 errx(1, "-l and -t are mutually exclusive.");
 149                         vfslist = makevfslist(makenetvfslist());
 150                         break;
 151                 case 'm':
 152                         if (setenv("BLOCKSIZE", "1m", 1) != 0)
 153                                 warn("setenv: cannot set BLOCKSIZE=1m");
 154                         hflag = 0;
 155                         break;
 156                 case 'n':
 157                         nflag = 1;
 158                         break;
 159                 case 't':
 160                         if (vfslist != NULL)
 161                                 errx(1, "only one -t option may be specified");
 162                         fstype = optarg;
 163                         vfslist = makevfslist(optarg);
 164                         break;
 165                 case 'T':
 166                         Tflag = 1;
 167                         break;
 168                 case '?':
 169                 default:
 170                         usage();
 171                 }
 172         argc -= optind;
 173         argv += optind;
 174
 175         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 176         bzero(&maxwidths, sizeof(maxwidths));
 177         for (i = 0; i < mntsize; i++)
 178                 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 179
 180         rv = 0;
 181         if (!*argv) {
 182                 mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist);
 183                 bzero(&maxwidths, sizeof(maxwidths));
 184                 for (i = 0; i < mntsize; i++)
 185                         update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 186                 for (i = 0; i < mntsize; i++) {
 187                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 188                                 prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths);
 189                 }
 190                 exit(rv);
 191         }
 192
 193         for (; *argv; argv++) {
 194                 if (stat(*argv, &stbuf) < 0) {
 195                         if ((mntpt = getmntpt(*argv)) == NULL) {
 196                                 warn("%s", *argv);
 197                                 rv = 1;
 198                                 continue;
 199                         }
 200                 } else if (S_ISCHR(stbuf.st_mode)) {
 201                         if ((mntpt = getmntpt(*argv)) == NULL) {
 202                                 mdev.fspec = *argv;
 203                                 mntpath = strdup("/tmp/df.XXXXXX");
 204                                 if (mntpath == NULL) {
 205                                         warn("strdup failed");
 206                                         rv = 1;
 207                                         continue;
 208                                 }
 209                                 mntpt = mkdtemp(mntpath);
 210                                 if (mntpt == NULL) {
 211                                         warn("mkdtemp(\"%s\") failed", mntpath);
 212                                         rv = 1;
 213                                         free(mntpath);
 214                                         continue;
 215                                 }
 216                                 if (mount(fstype, mntpt, MNT_RDONLY,
 217                                     &mdev) != 0) {
 218                                         warn("%s", *argv);
 219                                         rv = 1;
 220                                         rmdir(mntpt);
 221                                         free(mntpath);
 222                                         continue;
 223                                 } else if (statfs(mntpt, &statfsbuf) == 0 &&
 224                                            statvfs(mntpt, &statvfsbuf) == 0) {
 225                                         statfsbuf.f_mntonname[0] = '\0';
 226                                         prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 227                                 } else {
 228                                         warn("%s", *argv);
 229                                         rv = 1;
 230                                 }
 231                                 unmount(mntpt, 0);
 232                                 rmdir(mntpt);
 233                                 free(mntpath);
 234                                 continue;
 235                         }
 236                 } else
 237                         mntpt = *argv;
 238                 /*
 239                  * Statfs does not take a `wait' flag, so we cannot
 240                  * implement nflag here.
 241                  */
 242                 if (statfs(mntpt, &statfsbuf) < 0) {
 243                         warn("%s", mntpt);
 244                         rv = 1;
 245                         continue;
 246                 }
 247                 if (statvfs(mntpt, &statvfsbuf) < 0) {
 248                         warn("%s", mntpt);
 249                         rv = 1;
 250                         continue;
 251                 }
 252                 /*
 253                  * Check to make sure the arguments we've been given are
 254                  * satisfied. Return an error if we have been asked to
 255                  * list a mount point that does not match the other args
 256                  * we've been given (-l, -t, etc.).
 257                  */
 258                 if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
 259                         rv = 1;
 260                         continue;
 261                 }
 262
 263                 if (argc == 1) {
 264                         bzero(&maxwidths, sizeof(maxwidths));
 265                         update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf);
 266                 }
 267                 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 268         }
 269         return (rv);
 270 }
 271
 272 static char *
 273 getmntpt(char *name)
 274 {
 275         long mntsize, i;
 276         struct statfs *mntbuf;
 277         struct statvfs *mntvbuf;
 278
 279         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 280         for (i = 0; i < mntsize; i++) {
 281                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 282                         return (mntbuf[i].f_mntonname);
 283         }
 284         return (0);
 285 }
 286
 287 /*
 288  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 289  * filesystem types not in vfslist and possibly re-stating to get
 290  * current (not cached) info.  Returns the new count of valid statfs bufs.
 291  */
 292 static long
 293 regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist)
 294 {
 295         int i, j;
 296         struct statfs *mntbuf;
 297         struct statvfs *mntvbuf;
 298
 299         if (vfslist == NULL)
 300                 return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT));
 301
 302         mntbuf = *mntbufp;
 303         mntvbuf = *mntvbufp;
 304         for (j = 0, i = 0; i < mntsize; i++) {
 305                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 306                         continue;
 307                 if (!nflag) {
 308                         statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 309                         statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]);
 310                 } else if (i != j) {
 311                         mntbuf[j] = mntbuf[i];
 312                         mntvbuf[j] = mntvbuf[i];
 313                 }
 314                 j++;
 315         }
 316         return (j);
 317 }
 318
 319 static void
 320 prthuman(struct statvfs *vsfsp, int64_t used)
 321 {
 322         prthumanval(vsfsp->f_blocks * vsfsp->f_bsize);
 323         prthumanval(used * vsfsp->f_bsize);
 324         prthumanval(vsfsp->f_bavail * vsfsp->f_bsize);
 325 }
 326
 327 static void
 328 prthumanval(int64_t bytes)
 329 {
 330         char buf[7];
 331         int flags;
 332
 333         flags = HN_B | HN_NOSPACE | HN_FRACTIONAL;
 334         if (hflag == UNITS_SI)
 335                 flags |= HN_DIVISOR_1000;
 336
 337         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 338             bytes, "", HN_AUTOSCALE, flags);
 339
 340         printf(" %6s", buf);
 341 }
 342
 343 /*
 344  * Print an inode count in "human-readable" format.
 345  */
 346 static void
 347 prthumanvalinode(int64_t bytes)
 348 {
 349         char buf[6];
 350         int flags;
 351
 352         flags = HN_NOSPACE | HN_FRACTIONAL | HN_DIVISOR_1000;
 353
 354         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 355             bytes, "", HN_AUTOSCALE, flags);
 356
 357         printf(" %5s", buf);
 358 }
 359
 360 /*
 361  * Convert statfs returned filesystem size into BLOCKSIZE units.
 362  * Attempts to avoid overflow for large filesystems.
 363  */
 364 static intmax_t
 365 fsbtoblk(int64_t num, uint64_t bsize, u_long reqbsize)
 366 {
 367         if (bsize != 0 && bsize < reqbsize)
 368                 return (num / (intmax_t)(reqbsize / bsize));
 369         else
 370                 return (num * (intmax_t)(bsize / reqbsize));
 371 }
 372
 373 /*
 374  * Print out status about a filesystem.
 375  */
 376 static void
 377 prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp)
 378 {
 379         static long blocksize;
 380         static int headerlen, timesthrough;
 381         static const char *header;
 382         int64_t used, availblks, inodes;
 383
 384         if (++timesthrough == 1) {
 385                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 386                 mwp->fstype = imax(mwp->fstype, strlen("Type"));
 387                 if (hflag) {
 388                         header = "  Size";
 389                         mwp->total = mwp->used = mwp->avail = strlen(header);
 390                 } else {
 391                         header = getbsize(&headerlen, &blocksize);
 392                         mwp->total = imax(mwp->total, headerlen);
 393                 }
 394                 mwp->used = imax(mwp->used, strlen("Used"));
 395                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 396
 397                 printf("%-*s", mwp->mntfrom, "Filesystem");
 398                 if (Tflag)
 399                         printf("  %-*s", mwp->fstype, "Type");
 400                 printf(" %-*s %*s %*s Capacity", mwp->total, header, mwp->used,
 401                     "Used", mwp->avail, "Avail");
 402                 if (iflag) {
 403                         mwp->iused = imax(hflag ? 0 : mwp->iused,
 404                             (int)strlen("  iused"));
 405                         mwp->ifree = imax(hflag ? 0 : mwp->ifree,
 406                             (int)strlen("ifree"));
 407                         printf(" %*s %*s %%iused", mwp->iused - 2,
 408                             "iused", mwp->ifree, "ifree");
 409                 }
 410                 printf("  Mounted on\n");
 411         }
 412         printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 413         if (Tflag)
 414                 printf("  %-*s", mwp->fstype, sfsp->f_fstypename);
 415         used = vsfsp->f_blocks - vsfsp->f_bfree;
 416         availblks = vsfsp->f_bavail + used;
 417         if (hflag) {
 418                 prthuman(vsfsp, used);
 419         } else {
 420                 printf(" %*jd %*jd %*jd", mwp->total,
 421                     fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize),
 422                     mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize),
 423                     mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize,
 424                     blocksize));
 425         }
 426         printf(" %5.0f%%",
 427             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 428         if (iflag) {
 429                 inodes = vsfsp->f_files;
 430                 used = inodes - vsfsp->f_ffree;
 431                 if (hflag) {
 432                         printf("  ");
 433                         prthumanvalinode(used);
 434                         prthumanvalinode(vsfsp->f_ffree);
 435                 } else {
 436                         printf(" %*jd %*jd", mwp->iused, (intmax_t)used,
 437                             mwp->ifree, (intmax_t)vsfsp->f_ffree);
 438                 }
 439                 printf(" %4.0f%% ", inodes == 0 ? 100.0 :
 440                     (double)used / (double)inodes * 100.0);
 441         } else
 442                 printf("  ");
 443         printf("  %s\n", sfsp->f_mntonname);
 444 }
 445
 446 /*
 447  * Update the maximum field-width information in `mwp' based on
 448  * the filesystem specified by `sfsp'.
 449  */
 450 static void
 451 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp)
 452 {
 453         static long blocksize;
 454         int dummy;
 455
 456         if (blocksize == 0)
 457                 getbsize(&dummy, &blocksize);
 458
 459         mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
 460         mwp->fstype = imax(mwp->fstype, strlen(sfsp->f_fstypename));
 461         mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks,
 462             vsfsp->f_bsize, blocksize)));
 463         mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks -
 464             vsfsp->f_bfree, vsfsp->f_bsize, blocksize)));
 465         mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail,
 466             vsfsp->f_bsize, blocksize)));
 467         mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files -
 468             vsfsp->f_ffree));
 469         mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree));
 470 }
 471
 472 /* Return the width in characters of the specified long. */
 473 static int
 474 quadwidth(int64_t val)
 475 {
 476         int len;
 477
 478         len = 0;
 479         /* Negative or zero values require one extra digit. */
 480         if (val <= 0) {
 481                 val = -val;
 482                 len++;
 483         }
 484         while (val > 0) {
 485                 len++;
 486                 val /= 10;
 487         }
 488         return (len);
 489 }
 490
 491 static void
 492 usage(void)
 493 {
 494
 495         fprintf(stderr,
 496             "usage: df [-b | -H | -h | -k | -m | -P] [-ailnT] [-t type] [file | filesystem ...]\n");
 497         exit(EX_USAGE);
 498 }
 499
 500 static char *
 501 makenetvfslist(void)
 502 {
 503         char *str, *strptr, **listptr;
 504         int mib[3], maxvfsconf, cnt=0, i;
 505         size_t miblen;
 506         struct ovfsconf *ptr;
 507
 508         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 509         miblen=sizeof(maxvfsconf);
 510         if (sysctl(mib, (unsigned int)(NELEM(mib)),
 511             &maxvfsconf, &miblen, NULL, 0)) {
 512                 warnx("sysctl failed");
 513                 return (NULL);
 514         }
 515
 516         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 517                 warnx("malloc failed");
 518                 return (NULL);
 519         }
 520
 521         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 522                 if (ptr->vfc_flags & VFCF_NETWORK) {
 523                         listptr[cnt++] = strdup(ptr->vfc_name);
 524                         if (listptr[cnt-1] == NULL) {
 525                                 warnx("malloc failed");
 526                                 free(listptr);
 527                                 return (NULL);
 528                         }
 529                 }
 530
 531         if (cnt == 0 ||
 532             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 533                 if (cnt > 0)
 534                         warnx("malloc failed");
 535                 free(listptr);
 536                 return (NULL);
 537         }
 538
 539         *str = 'n'; *(str + 1) = 'o';
 540         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 541                 strncpy(strptr, listptr[i], 32);
 542                 strptr += strlen(listptr[i]);
 543                 *strptr = ',';
 544                 free(listptr[i]);
 545         }
 546         *(--strptr) = '\0';
 547
 548         free(listptr);
 549         return (str);
 550 }