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  * 4. 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/fs.h>
  47 #include <vfs/ufs/ufsmount.h>
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <fstab.h>
  53 #include <libutil.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <sysexits.h>
  58 #include <unistd.h>
  59
  60 #define UNITS_SI 1
  61 #define UNITS_2 2
  62
  63 /* Maximum widths of various fields. */
  64 struct maxwidths {
  65         int mntfrom;
  66         int total;
  67         int used;
  68         int avail;
  69         int iused;
  70         int ifree;
  71 };
  72
  73 int       bread(off_t, void *, int);
  74 int       checkvfsname(const char *, char **);
  75 char     *getmntpt(char *);
  76 int       quadwidth(int64_t);
  77 char     *makenetvfslist(void);
  78 char    **makevfslist(char *);
  79 void      prthuman(struct statvfs *, int64_t);
  80 void      prthumanval(int64_t);
  81 void      prtstat(struct statfs *, struct statvfs *, struct maxwidths *);
  82 long      regetmntinfo(struct statfs **, struct statvfs **,  long, char **);
  83 int       ufs_df(char *, struct maxwidths *);
  84 void      update_maxwidths(struct maxwidths *, struct statfs *, struct statvfs *);
  85 void      usage(void);
  86
  87 int     aflag = 0, hflag, iflag, nflag;
  88 struct  ufs_args mdev;
  89
  90 static __inline int
  91 imax(int a, int b)
  92 {
  93         return (a > b ? a : b);
  94 }
  95
  96 static __inline int64_t
  97 qmax(int64_t a, int64_t b)
  98 {
  99         return (a > b ? a : b);
 100 }
 101
 102 int
 103 main(int argc, char **argv)
 104 {
 105         struct stat stbuf;
 106         struct statfs statfsbuf, *mntbuf;
 107         struct statvfs statvfsbuf, *mntvbuf;
 108         struct maxwidths maxwidths;
 109         const char *fstype;
 110         char *mntpath, *mntpt, **vfslist;
 111         long mntsize;
 112         int ch, i, rv;
 113
 114         fstype = "ufs";
 115
 116         vfslist = NULL;
 117         while ((ch = getopt(argc, argv, "abgHhiklmnPt:")) != -1)
 118                 switch (ch) {
 119                 case 'a':
 120                         aflag = 1;
 121                         break;
 122                 case 'b':
 123                                 /* FALLTHROUGH */
 124                 case 'P':
 125                         if (setenv("BLOCKSIZE", "512", 1) != 0)
 126                                 warn("setenv: cannot set BLOCKSIZE=512");
 127                         hflag = 0;
 128                         break;
 129                 case 'g':
 130                         if (setenv("BLOCKSIZE", "1g", 1) != 0)
 131                                 warn("setenv: cannot set BLOCKSIZE=1g");
 132                         hflag = 0;
 133                         break;
 134                 case 'H':
 135                         hflag = UNITS_SI;
 136                         break;
 137                 case 'h':
 138                         hflag = UNITS_2;
 139                         break;
 140                 case 'i':
 141                         iflag = 1;
 142                         break;
 143                 case 'k':
 144                         if (setenv("BLOCKSIZE", "1k", 1) != 0)
 145                                 warn("setenv: cannot set BLOCKSIZE=1k");
 146                         hflag = 0;
 147                         break;
 148                 case 'l':
 149                         if (vfslist != NULL)
 150                                 errx(1, "-l and -t are mutually exclusive.");
 151                         vfslist = makevfslist(makenetvfslist());
 152                         break;
 153                 case 'm':
 154                         if (setenv("BLOCKSIZE", "1m", 1) != 0)
 155                                 warn("setenv: cannot set BLOCKSIZE=1m");
 156                         hflag = 0;
 157                         break;
 158                 case 'n':
 159                         nflag = 1;
 160                         break;
 161                 case 't':
 162                         if (vfslist != NULL)
 163                                 errx(1, "only one -t option may be specified");
 164                         fstype = optarg;
 165                         vfslist = makevfslist(optarg);
 166                         break;
 167                 case '?':
 168                 default:
 169                         usage();
 170                 }
 171         argc -= optind;
 172         argv += optind;
 173
 174         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 175         bzero(&maxwidths, sizeof(maxwidths));
 176         for (i = 0; i < mntsize; i++)
 177                 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 178
 179         rv = 0;
 180         if (!*argv) {
 181                 mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist);
 182                 bzero(&maxwidths, sizeof(maxwidths));
 183                 for (i = 0; i < mntsize; i++)
 184                         update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 185                 for (i = 0; i < mntsize; i++) {
 186                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 187                                 prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths);
 188                 }
 189                 exit(rv);
 190         }
 191
 192         for (; *argv; argv++) {
 193                 if (stat(*argv, &stbuf) < 0) {
 194                         if ((mntpt = getmntpt(*argv)) == NULL) {
 195                                 warn("%s", *argv);
 196                                 rv = 1;
 197                                 continue;
 198                         }
 199                 } else if (S_ISCHR(stbuf.st_mode)) {
 200                         if ((mntpt = getmntpt(*argv)) == NULL) {
 201                                 mdev.fspec = *argv;
 202                                 mntpath = strdup("/tmp/df.XXXXXX");
 203                                 if (mntpath == NULL) {
 204                                         warn("strdup failed");
 205                                         rv = 1;
 206                                         continue;
 207                                 }
 208                                 mntpt = mkdtemp(mntpath);
 209                                 if (mntpt == NULL) {
 210                                         warn("mkdtemp(\"%s\") failed", mntpath);
 211                                         rv = 1;
 212                                         free(mntpath);
 213                                         continue;
 214                                 }
 215                                 if (mount(fstype, mntpt, MNT_RDONLY,
 216                                     &mdev) != 0) {
 217                                         rv = ufs_df(*argv, &maxwidths) || rv;
 218                                         rmdir(mntpt);
 219                                         free(mntpath);
 220                                         continue;
 221                                 } else if (statfs(mntpt, &statfsbuf) == 0 &&
 222                                            statvfs(mntpt, &statvfsbuf) == 0) {
 223                                         statfsbuf.f_mntonname[0] = '\0';
 224                                         prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 225                                 } else {
 226                                         warn("%s", *argv);
 227                                         rv = 1;
 228                                 }
 229                                 unmount(mntpt, 0);
 230                                 rmdir(mntpt);
 231                                 free(mntpath);
 232                                 continue;
 233                         }
 234                 } else
 235                         mntpt = *argv;
 236                 /*
 237                  * Statfs does not take a `wait' flag, so we cannot
 238                  * implement nflag here.
 239                  */
 240                 if (statfs(mntpt, &statfsbuf) < 0) {
 241                         warn("%s", mntpt);
 242                         rv = 1;
 243                         continue;
 244                 }
 245                 if (statvfs(mntpt, &statvfsbuf) < 0) {
 246                         warn("%s", mntpt);
 247                         rv = 1;
 248                         continue;
 249                 }
 250                 /*
 251                  * Check to make sure the arguments we've been given are
 252                  * satisfied. Return an error if we have been asked to
 253                  * list a mount point that does not match the other args
 254                  * we've been given (-l, -t, etc.).
 255                  */
 256                 if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
 257                         rv = 1;
 258                         continue;
 259                 }
 260
 261                 if (argc == 1) {
 262                         bzero(&maxwidths, sizeof(maxwidths));
 263                         update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf);
 264                 }
 265                 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 266         }
 267         return (rv);
 268 }
 269
 270 char *
 271 getmntpt(char *name)
 272 {
 273         long mntsize, i;
 274         struct statfs *mntbuf;
 275         struct statvfs *mntvbuf;
 276
 277         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 278         for (i = 0; i < mntsize; i++) {
 279                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 280                         return (mntbuf[i].f_mntonname);
 281         }
 282         return (0);
 283 }
 284
 285 /*
 286  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 287  * filesystem types not in vfslist and possibly re-stating to get
 288  * current (not cached) info.  Returns the new count of valid statfs bufs.
 289  */
 290 long
 291 regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist)
 292 {
 293         int i, j;
 294         struct statfs *mntbuf;
 295         struct statvfs *mntvbuf;
 296
 297         if (vfslist == NULL)
 298                 return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT));
 299
 300         mntbuf = *mntbufp;
 301         mntvbuf = *mntvbufp;
 302         for (j = 0, i = 0; i < mntsize; i++) {
 303                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 304                         continue;
 305                 if (!nflag) {
 306                         statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 307                         statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]);
 308                 } else if (i != j) {
 309                         mntbuf[j] = mntbuf[i];
 310                         mntvbuf[j] = mntvbuf[i];
 311                 }
 312                 j++;
 313         }
 314         return (j);
 315 }
 316
 317 void
 318 prthuman(struct statvfs *vsfsp, int64_t used)
 319 {
 320         prthumanval(vsfsp->f_blocks * vsfsp->f_bsize);
 321         prthumanval(used * vsfsp->f_bsize);
 322         prthumanval(vsfsp->f_bavail * vsfsp->f_bsize);
 323 }
 324
 325 void
 326 prthumanval(int64_t bytes)
 327 {
 328         char buf[6];
 329         int flags;
 330
 331         flags = HN_B | HN_NOSPACE | HN_DECIMAL;
 332         if (hflag == UNITS_SI)
 333                 flags |= HN_DIVISOR_1000;
 334
 335         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 336             bytes, "", HN_AUTOSCALE, flags);
 337
 338         printf(" %6s", buf);
 339 }
 340
 341 /*
 342  * Convert statfs returned filesystem size into BLOCKSIZE units.
 343  * Attempts to avoid overflow for large filesystems.
 344  */
 345 static intmax_t
 346 fsbtoblk(int64_t num, uint64_t bsize, u_long reqbsize)
 347 {
 348         if (bsize != 0 && bsize < reqbsize)
 349                 return (num / (intmax_t)(reqbsize / bsize));
 350         else
 351                 return (num * (intmax_t)(bsize / reqbsize));
 352 }
 353
 354 /*
 355  * Print out status about a filesystem.
 356  */
 357 void
 358 prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp)
 359 {
 360         static long blocksize;
 361         static int headerlen, timesthrough;
 362         static const char *header;
 363         int64_t used, availblks, inodes;
 364
 365         if (++timesthrough == 1) {
 366                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 367                 if (hflag) {
 368                         header = "  Size";
 369                         mwp->total = mwp->used = mwp->avail = strlen(header);
 370                 } else {
 371                         header = getbsize(&headerlen, &blocksize);
 372                         mwp->total = imax(mwp->total, headerlen);
 373                 }
 374                 mwp->used = imax(mwp->used, strlen("Used"));
 375                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 376
 377                 printf("%-*s %-*s %*s %*s Capacity", mwp->mntfrom,
 378                     "Filesystem", mwp->total, header, mwp->used, "Used",
 379                     mwp->avail, "Avail");
 380                 if (iflag) {
 381                         mwp->iused = imax(mwp->iused, strlen("  iused"));
 382                         mwp->ifree = imax(mwp->ifree, strlen("ifree"));
 383                         printf(" %*s %*s %%iused", mwp->iused - 2,
 384                             "iused", mwp->ifree, "ifree");
 385                 }
 386                 printf("  Mounted on\n");
 387         }
 388         printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 389         used = vsfsp->f_blocks - vsfsp->f_bfree;
 390         availblks = vsfsp->f_bavail + used;
 391         if (hflag) {
 392                 prthuman(vsfsp, used);
 393         } else {
 394                 printf(" %*jd %*jd %*jd", mwp->total,
 395                     fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize),
 396                     mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize),
 397                     mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize,
 398                     blocksize));
 399         }
 400         printf(" %5.0f%%",
 401             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 402         if (iflag) {
 403                 inodes = vsfsp->f_files;
 404                 used = inodes - vsfsp->f_ffree;
 405                 printf(" %*jd %*jd %4.0f%% ", mwp->iused, (intmax_t)used,
 406                     mwp->ifree, (intmax_t)vsfsp->f_ffree, inodes == 0 ? 100.0 :
 407                     (double)used / (double)inodes * 100.0);
 408         } else
 409                 printf("  ");
 410         printf("  %s\n", sfsp->f_mntonname);
 411 }
 412
 413 /*
 414  * Update the maximum field-width information in `mwp' based on
 415  * the filesystem specified by `sfsp'.
 416  */
 417 void
 418 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp)
 419 {
 420         static long blocksize;
 421         int dummy;
 422
 423         if (blocksize == 0)
 424                 getbsize(&dummy, &blocksize);
 425
 426         mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
 427         mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks,
 428             vsfsp->f_bsize, blocksize)));
 429         mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks -
 430             vsfsp->f_bfree, vsfsp->f_bsize, blocksize)));
 431         mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail,
 432             vsfsp->f_bsize, blocksize)));
 433         mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files -
 434             vsfsp->f_ffree));
 435         mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree));
 436 }
 437
 438 /* Return the width in characters of the specified long. */
 439 int
 440 quadwidth(int64_t val)
 441 {
 442         int len;
 443
 444         len = 0;
 445         /* Negative or zero values require one extra digit. */
 446         if (val <= 0) {
 447                 val = -val;
 448                 len++;
 449         }
 450         while (val > 0) {
 451                 len++;
 452                 val /= 10;
 453         }
 454         return (len);
 455 }
 456
 457 /*
 458  * This code constitutes the pre-system call Berkeley df code for extracting
 459  * information from filesystem superblocks.
 460  */
 461
 462 union {
 463         struct fs iu_fs;
 464         char dummy[SBSIZE];
 465 } sb;
 466 #define sblock sb.iu_fs
 467
 468 int     rfd;
 469
 470 int
 471 ufs_df(char *file, struct maxwidths *mwp)
 472 {
 473         struct statfs statfsbuf;
 474         struct statvfs statvfsbuf;
 475         struct statfs *sfsp;
 476         struct statvfs *vsfsp;
 477         const char *mntpt;
 478         static int synced;
 479
 480         if (synced++ == 0)
 481                 sync();
 482
 483         if ((rfd = open(file, O_RDONLY)) < 0) {
 484                 warn("%s", file);
 485                 return (1);
 486         }
 487         if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) {
 488                 close(rfd);
 489                 return (1);
 490         }
 491         sfsp = &statfsbuf;
 492         vsfsp = &statvfsbuf;
 493         sfsp->f_type = 1;
 494         strcpy(sfsp->f_fstypename, "ufs");
 495         sfsp->f_flags = 0;
 496         sfsp->f_bsize = vsfsp->f_bsize = sblock.fs_fsize;
 497         sfsp->f_iosize = vsfsp->f_frsize = sblock.fs_bsize;
 498         sfsp->f_blocks = vsfsp->f_blocks = sblock.fs_dsize;
 499         sfsp->f_bfree = vsfsp->f_bfree =
 500                 sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
 501                 sblock.fs_cstotal.cs_nffree;
 502         sfsp->f_bavail = vsfsp->f_bavail = freespace(&sblock, sblock.fs_minfree);
 503         sfsp->f_files = vsfsp->f_files = sblock.fs_ncg * sblock.fs_ipg;
 504         sfsp->f_ffree = vsfsp->f_ffree = sblock.fs_cstotal.cs_nifree;
 505         sfsp->f_fsid.val[0] = 0;
 506         sfsp->f_fsid.val[1] = 0;
 507         if ((mntpt = getmntpt(file)) == NULL)
 508                 mntpt = "";
 509         memmove(&sfsp->f_mntonname[0], mntpt, (size_t)MNAMELEN);
 510         memmove(&sfsp->f_mntfromname[0], file, (size_t)MNAMELEN);
 511         prtstat(sfsp, vsfsp, mwp);
 512         close(rfd);
 513         return (0);
 514 }
 515
 516 int
 517 bread(off_t off, void *buf, int cnt)
 518 {
 519         ssize_t nr;
 520
 521         lseek(rfd, off, SEEK_SET);
 522         if ((nr = read(rfd, buf, (size_t)cnt)) != (ssize_t)cnt) {
 523                 /* Probably a dismounted disk if errno == EIO. */
 524                 if (errno != EIO)
 525                         fprintf(stderr, "\ndf: %lld: %s\n",
 526                             (long long)off, strerror(nr > 0 ? EIO : errno));
 527                 return (0);
 528         }
 529         return (1);
 530 }
 531
 532 void
 533 usage(void)
 534 {
 535
 536         fprintf(stderr,
 537             "usage: df [-b | -H | -h | -k | -m | -P] [-ailn] [-t type] [file | filesystem ...]\n");
 538         exit(EX_USAGE);
 539 }
 540
 541 char *
 542 makenetvfslist(void)
 543 {
 544         char *str, *strptr, **listptr;
 545         int mib[3], maxvfsconf, cnt=0, i;
 546         size_t miblen;
 547         struct ovfsconf *ptr;
 548
 549         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 550         miblen=sizeof(maxvfsconf);
 551         if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
 552             &maxvfsconf, &miblen, NULL, 0)) {
 553                 warnx("sysctl failed");
 554                 return (NULL);
 555         }
 556
 557         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 558                 warnx("malloc failed");
 559                 return (NULL);
 560         }
 561
 562         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 563                 if (ptr->vfc_flags & VFCF_NETWORK) {
 564                         listptr[cnt++] = strdup(ptr->vfc_name);
 565                         if (listptr[cnt-1] == NULL) {
 566                                 warnx("malloc failed");
 567                                 return (NULL);
 568                         }
 569                 }
 570
 571         if (cnt == 0 ||
 572             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 573                 if (cnt > 0)
 574                         warnx("malloc failed");
 575                 free(listptr);
 576                 return (NULL);
 577         }
 578
 579         *str = 'n'; *(str + 1) = 'o';
 580         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 581                 strncpy(strptr, listptr[i], 32);
 582                 strptr += strlen(listptr[i]);
 583                 *strptr = ',';
 584                 free(listptr[i]);
 585         }
 586         *(--strptr) = '\0';
 587
 588         free(listptr);
 589         return (str);
 590 }