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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * @(#) Copyright (c) 1980, 1990, 1993, 1994 The Regents of the University of California.  All rights reserved.
  39  * @(#)df.c     8.9 (Berkeley) 5/8/95
  40  * $FreeBSD: src/bin/df/df.c,v 1.23.2.9 2002/07/01 00:14:24 iedowse Exp $
  41  * $DragonFly: src/bin/df/df.c,v 1.10.2.1 2008/08/06 07:54:07 swildner Exp $
  42  */
  43
  44 #include <sys/cdefs.h>
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47 #include <sys/mount.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/statvfs.h>
  50
  51 #include <vfs/ufs/dinode.h>
  52 #include <vfs/ufs/fs.h>
  53 #include <vfs/ufs/ufsmount.h>
  54
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #include <fstab.h>
  59 #include <libutil.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <sysexits.h>
  64 #include <unistd.h>
  65
  66 #define UNITS_SI 1
  67 #define UNITS_2 2
  68
  69 /* Maximum widths of various fields. */
  70 struct maxwidths {
  71         int mntfrom;
  72         int total;
  73         int used;
  74         int avail;
  75         int iused;
  76         int ifree;
  77 };
  78
  79 int       bread(off_t, void *, int);
  80 int       checkvfsname(const char *, char **);
  81 char     *getmntpt(char *);
  82 int       quadwidth(int64_t);
  83 char     *makenetvfslist(void);
  84 char    **makevfslist(char *);
  85 void      prthuman(struct statvfs *, long);
  86 void      prthumanval(int64_t);
  87 void      prtstat(struct statfs *, struct statvfs *, struct maxwidths *);
  88 long      regetmntinfo(struct statfs **, struct statvfs **,  long, char **);
  89 int       ufs_df(char *, struct maxwidths *);
  90 void      update_maxwidths(struct maxwidths *, struct statfs *, struct statvfs *);
  91 void      usage(void);
  92
  93 int     aflag = 0, hflag, iflag, nflag;
  94 struct  ufs_args mdev;
  95
  96 static __inline int
  97 imax(int a, int b)
  98 {
  99         return (a > b ? a : b);
 100 }
 101
 102 static __inline int64_t
 103 qmax(int64_t a, int64_t b)
 104 {
 105         return (a > b ? a : b);
 106 }
 107
 108 int
 109 main(int argc, char **argv)
 110 {
 111         struct stat stbuf;
 112         struct statfs statfsbuf, *mntbuf;
 113         struct statvfs statvfsbuf, *mntvbuf;
 114         struct maxwidths maxwidths;
 115         const char *fstype;
 116         char *mntpath, *mntpt, **vfslist;
 117         long mntsize;
 118         int ch, i, rv;
 119
 120         fstype = "ufs";
 121
 122         vfslist = NULL;
 123         while ((ch = getopt(argc, argv, "abgHhiklmnPt:")) != -1)
 124                 switch (ch) {
 125                 case 'a':
 126                         aflag = 1;
 127                         break;
 128                 case 'b':
 129                                 /* FALLTHROUGH */
 130                 case 'P':
 131                         if (putenv("BLOCKSIZE=512") != 0)
 132                                 warn("putenv: cannot set BLOCKSIZE=512");
 133                         hflag = 0;
 134                         break;
 135                 case 'g':
 136                         if (putenv("BLOCKSIZE=1g") != 0)
 137                                 warn("putenv: cannot set BLOCKSIZE=1g");
 138                         hflag = 0;
 139                         break;
 140                 case 'H':
 141                         hflag = UNITS_SI;
 142                         break;
 143                 case 'h':
 144                         hflag = UNITS_2;
 145                         break;
 146                 case 'i':
 147                         iflag = 1;
 148                         break;
 149                 case 'k':
 150                         if (putenv("BLOCKSIZE=1k") != 0)
 151                                 warn("putenv: cannot set BLOCKSIZE=1k");
 152                         hflag = 0;
 153                         break;
 154                 case 'l':
 155                         if (vfslist != NULL)
 156                                 errx(1, "-l and -t are mutually exclusive.");
 157                         vfslist = makevfslist(makenetvfslist());
 158                         break;
 159                 case 'm':
 160                         if (putenv("BLOCKSIZE=1m") != 0)
 161                                 warn("putenv: cannot set BLOCKSIZE=1m");
 162                         hflag = 0;
 163                         break;
 164                 case 'n':
 165                         nflag = 1;
 166                         break;
 167                 case 't':
 168                         if (vfslist != NULL)
 169                                 errx(1, "only one -t option may be specified");
 170                         fstype = optarg;
 171                         vfslist = makevfslist(optarg);
 172                         break;
 173                 case '?':
 174                 default:
 175                         usage();
 176                 }
 177         argc -= optind;
 178         argv += optind;
 179
 180         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 181         bzero(&maxwidths, sizeof(maxwidths));
 182         for (i = 0; i < mntsize; i++)
 183                 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 184
 185         rv = 0;
 186         if (!*argv) {
 187                 mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist);
 188                 bzero(&maxwidths, sizeof(maxwidths));
 189                 for (i = 0; i < mntsize; i++)
 190                         update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 191                 for (i = 0; i < mntsize; i++) {
 192                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 193                                 prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths);
 194                 }
 195                 exit(rv);
 196         }
 197
 198         for (; *argv; argv++) {
 199                 if (stat(*argv, &stbuf) < 0) {
 200                         if ((mntpt = getmntpt(*argv)) == 0) {
 201                                 warn("%s", *argv);
 202                                 rv = 1;
 203                                 continue;
 204                         }
 205                 } else if (S_ISCHR(stbuf.st_mode)) {
 206                         if ((mntpt = getmntpt(*argv)) == 0) {
 207                                 mdev.fspec = *argv;
 208                                 mntpath = strdup("/tmp/df.XXXXXX");
 209                                 if (mntpath == NULL) {
 210                                         warn("strdup failed");
 211                                         rv = 1;
 212                                         continue;
 213                                 }
 214                                 mntpt = mkdtemp(mntpath);
 215                                 if (mntpt == NULL) {
 216                                         warn("mkdtemp(\"%s\") failed", mntpath);
 217                                         rv = 1;
 218                                         free(mntpath);
 219                                         continue;
 220                                 }
 221                                 if (mount(fstype, mntpt, MNT_RDONLY,
 222                                     &mdev) != 0) {
 223                                         rv = ufs_df(*argv, &maxwidths) || rv;
 224                                         rmdir(mntpt);
 225                                         free(mntpath);
 226                                         continue;
 227                                 } else if (statfs(mntpt, &statfsbuf) == 0 &&
 228                                            statvfs(mntpt, &statvfsbuf) == 0) {
 229                                         statfsbuf.f_mntonname[0] = '\0';
 230                                         prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 231                                 } else {
 232                                         warn("%s", *argv);
 233                                         rv = 1;
 234                                 }
 235                                 unmount(mntpt, 0);
 236                                 rmdir(mntpt);
 237                                 free(mntpath);
 238                                 continue;
 239                         }
 240                 } else
 241                         mntpt = *argv;
 242                 /*
 243                  * Statfs does not take a `wait' flag, so we cannot
 244                  * implement nflag here.
 245                  */
 246                 if (statfs(mntpt, &statfsbuf) < 0) {
 247                         warn("%s", mntpt);
 248                         rv = 1;
 249                         continue;
 250                 }
 251                 if (statvfs(mntpt, &statvfsbuf) < 0) {
 252                         warn("%s", mntpt);
 253                         rv = 1;
 254                         continue;
 255                 }
 256                 if (argc == 1) {
 257                         bzero(&maxwidths, sizeof(maxwidths));
 258                         update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf);
 259                 }
 260                 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 261         }
 262         return (rv);
 263 }
 264
 265 char *
 266 getmntpt(char *name)
 267 {
 268         long mntsize, i;
 269         struct statfs *mntbuf;
 270         struct statvfs *mntvbuf;
 271
 272         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 273         for (i = 0; i < mntsize; i++) {
 274                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 275                         return (mntbuf[i].f_mntonname);
 276         }
 277         return (0);
 278 }
 279
 280 /*
 281  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 282  * filesystem types not in vfslist and possibly re-stating to get
 283  * current (not cached) info.  Returns the new count of valid statfs bufs.
 284  */
 285 long
 286 regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist)
 287 {
 288         int i, j;
 289         struct statfs *mntbuf;
 290         struct statvfs *mntvbuf;
 291
 292         if (vfslist == NULL)
 293                 return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT));
 294
 295         mntbuf = *mntbufp;
 296         mntvbuf = *mntvbufp;
 297         for (j = 0, i = 0; i < mntsize; i++) {
 298                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 299                         continue;
 300                 if (!nflag) {
 301                         statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 302                         statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]);
 303                 } else if (i != j) {
 304                         mntbuf[j] = mntbuf[i];
 305                         mntvbuf[j] = mntvbuf[i];
 306                 }
 307                 j++;
 308         }
 309         return (j);
 310 }
 311
 312 void
 313 prthuman(struct statvfs *vsfsp, long used)
 314 {
 315         prthumanval(vsfsp->f_blocks * vsfsp->f_bsize);
 316         prthumanval(used * vsfsp->f_bsize);
 317         prthumanval(vsfsp->f_bavail * vsfsp->f_bsize);
 318 }
 319
 320 void
 321 prthumanval(int64_t bytes)
 322 {
 323         char buf[6];
 324         int flags;
 325
 326         flags = HN_B | HN_NOSPACE | HN_DECIMAL;
 327         if (hflag == UNITS_SI)
 328                 flags |= HN_DIVISOR_1000;
 329
 330         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 331             bytes, "", HN_AUTOSCALE, flags);
 332
 333         printf(" %6s", buf);
 334 }
 335
 336 /*
 337  * Convert statfs returned filesystem size into BLOCKSIZE units.
 338  * Attempts to avoid overflow for large filesystems.
 339  */
 340 static
 341 int64_t
 342 fsbtoblk(int64_t num, long bsize, long reqbsize)
 343 {
 344         if (bsize && bsize < reqbsize)
 345                 num = num / (reqbsize / bsize);
 346         else
 347                 num = num * (bsize / reqbsize);
 348         return(num);
 349 }
 350
 351 /*
 352  * Print out status about a filesystem.
 353  */
 354 void
 355 prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp)
 356 {
 357         static long blocksize;
 358         static int headerlen, timesthrough;
 359         static const char *header;
 360         int64_t used, availblks, inodes;
 361
 362         if (++timesthrough == 1) {
 363                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 364                 if (hflag) {
 365                         header = "  Size";
 366                         mwp->total = mwp->used = mwp->avail = strlen(header);
 367                 } else {
 368                         header = getbsize(&headerlen, &blocksize);
 369                         mwp->total = imax(mwp->total, headerlen);
 370                 }
 371                 mwp->used = imax(mwp->used, strlen("Used"));
 372                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 373
 374                 printf("%-*s %-*s %*s %*s Capacity", mwp->mntfrom,
 375                     "Filesystem", mwp->total, header, mwp->used, "Used",
 376                     mwp->avail, "Avail");
 377                 if (iflag) {
 378                         mwp->iused = imax(mwp->iused, strlen("  iused"));
 379                         mwp->ifree = imax(mwp->ifree, strlen("ifree"));
 380                         printf(" %*s %*s %%iused", mwp->iused - 2,
 381                             "iused", mwp->ifree, "ifree");
 382                 }
 383                 printf("  Mounted on\n");
 384         }
 385         printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 386         used = vsfsp->f_blocks - vsfsp->f_bfree;
 387         availblks = vsfsp->f_bavail + used;
 388         if (hflag) {
 389                 prthuman(vsfsp, used);
 390         } else {
 391                 printf(" %*lld %*lld %*lld", mwp->total,
 392                     fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize),
 393                     mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize),
 394                     mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize,
 395                     blocksize));
 396         }
 397         printf(" %5.0f%%",
 398             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 399         if (iflag) {
 400                 inodes = vsfsp->f_files;
 401                 used = inodes - vsfsp->f_ffree;
 402                 printf(" %*lld %*lld %4.0f%% ", mwp->iused, used,
 403                     mwp->ifree, (int64_t)vsfsp->f_ffree, inodes == 0 ? 100.0 :
 404                     (double)used / (double)inodes * 100.0);
 405         } else
 406                 printf("  ");
 407         printf("  %s\n", sfsp->f_mntonname);
 408 }
 409
 410 /*
 411  * Update the maximum field-width information in `mwp' based on
 412  * the filesystem specified by `sfsp'.
 413  */
 414 void
 415 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp)
 416 {
 417         static long blocksize;
 418         int dummy;
 419
 420         if (blocksize == 0)
 421                 getbsize(&dummy, &blocksize);
 422
 423         mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
 424         mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks,
 425             vsfsp->f_bsize, blocksize)));
 426         mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks -
 427             vsfsp->f_bfree, vsfsp->f_bsize, blocksize)));
 428         mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail,
 429             vsfsp->f_bsize, blocksize)));
 430         mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files -
 431             vsfsp->f_ffree));
 432         mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree));
 433 }
 434
 435 /* Return the width in characters of the specified long. */
 436 int
 437 quadwidth(int64_t val)
 438 {
 439         int len;
 440
 441         len = 0;
 442         /* Negative or zero values require one extra digit. */
 443         if (val <= 0) {
 444                 val = -val;
 445                 len++;
 446         }
 447         while (val > 0) {
 448                 len++;
 449                 val /= 10;
 450         }
 451         return (len);
 452 }
 453
 454 /*
 455  * This code constitutes the pre-system call Berkeley df code for extracting
 456  * information from filesystem superblocks.
 457  */
 458
 459 union {
 460         struct fs iu_fs;
 461         char dummy[SBSIZE];
 462 } sb;
 463 #define sblock sb.iu_fs
 464
 465 int     rfd;
 466
 467 int
 468 ufs_df(char *file, struct maxwidths *mwp)
 469 {
 470         struct statfs statfsbuf;
 471         struct statvfs statvfsbuf;
 472         struct statfs *sfsp;
 473         struct statvfs *vsfsp;
 474         const char *mntpt;
 475         static int synced;
 476
 477         if (synced++ == 0)
 478                 sync();
 479
 480         if ((rfd = open(file, O_RDONLY)) < 0) {
 481                 warn("%s", file);
 482                 return (1);
 483         }
 484         if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) {
 485                 close(rfd);
 486                 return (1);
 487         }
 488         sfsp = &statfsbuf;
 489         vsfsp = &statvfsbuf;
 490         sfsp->f_type = 1;
 491         strcpy(sfsp->f_fstypename, "ufs");
 492         sfsp->f_flags = 0;
 493         sfsp->f_bsize = vsfsp->f_bsize = sblock.fs_fsize;
 494         sfsp->f_iosize = vsfsp->f_frsize = sblock.fs_bsize;
 495         sfsp->f_blocks = vsfsp->f_blocks = sblock.fs_dsize;
 496         sfsp->f_bfree = vsfsp->f_bfree =
 497                 sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
 498                 sblock.fs_cstotal.cs_nffree;
 499         sfsp->f_bavail = vsfsp->f_bavail = freespace(&sblock, sblock.fs_minfree);
 500         sfsp->f_files = vsfsp->f_files = sblock.fs_ncg * sblock.fs_ipg;
 501         sfsp->f_ffree = vsfsp->f_ffree = sblock.fs_cstotal.cs_nifree;
 502         sfsp->f_fsid.val[0] = 0;
 503         sfsp->f_fsid.val[1] = 0;
 504         if ((mntpt = getmntpt(file)) == 0)
 505                 mntpt = "";
 506         memmove(&sfsp->f_mntonname[0], mntpt, (size_t)MNAMELEN);
 507         memmove(&sfsp->f_mntfromname[0], file, (size_t)MNAMELEN);
 508         prtstat(sfsp, vsfsp, mwp);
 509         close(rfd);
 510         return (0);
 511 }
 512
 513 int
 514 bread(off_t off, void *buf, int cnt)
 515 {
 516         ssize_t nr;
 517
 518         lseek(rfd, off, SEEK_SET);
 519         if ((nr = read(rfd, buf, (size_t)cnt)) != (ssize_t)cnt) {
 520                 /* Probably a dismounted disk if errno == EIO. */
 521                 if (errno != EIO)
 522                         fprintf(stderr, "\ndf: %lld: %s\n",
 523                             (long long)off, strerror(nr > 0 ? EIO : errno));
 524                 return (0);
 525         }
 526         return (1);
 527 }
 528
 529 void
 530 usage(void)
 531 {
 532
 533         fprintf(stderr,
 534             "usage: df [-b | -H | -h | -k | -m | -P] [-ailn] [-t type] [file | filesystem ...]\n");
 535         exit(EX_USAGE);
 536 }
 537
 538 char *
 539 makenetvfslist(void)
 540 {
 541         char *str, *strptr, **listptr;
 542         int mib[3], maxvfsconf, cnt=0, i;
 543         size_t miblen;
 544         struct ovfsconf *ptr;
 545
 546         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 547         miblen=sizeof(maxvfsconf);
 548         if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
 549             &maxvfsconf, &miblen, NULL, 0)) {
 550                 warnx("sysctl failed");
 551                 return (NULL);
 552         }
 553
 554         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 555                 warnx("malloc failed");
 556                 return (NULL);
 557         }
 558
 559         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 560                 if (ptr->vfc_flags & VFCF_NETWORK) {
 561                         listptr[cnt++] = strdup(ptr->vfc_name);
 562                         if (listptr[cnt-1] == NULL) {
 563                                 warnx("malloc failed");
 564                                 return (NULL);
 565                         }
 566                 }
 567
 568         if (cnt == 0 ||
 569             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 570                 if (cnt > 0)
 571                         warnx("malloc failed");
 572                 free(listptr);
 573                 return (NULL);
 574         }
 575
 576         *str = 'n'; *(str + 1) = 'o';
 577         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 578                 strncpy(strptr, listptr[i], 32);
 579                 strptr += strlen(listptr[i]);
 580                 *strptr = ',';
 581                 free(listptr[i]);
 582         }
 583         *(--strptr) = '\0';
 584
 585         free(listptr);
 586         return (str);
 587 }