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 /* Maximum widths of various fields. */
  63 struct maxwidths {
  64         int mntfrom;
  65         int fstype;
  66         int total;
  67         int used;
  68         int avail;
  69         int iused;
  70         int ifree;
  71 };
  72
  73 /* vfslist.c */
  74 char    **makevfslist(char *);
  75 int       checkvfsname(const char *, char **);
  76
  77 static char     *getmntpt(char *);
  78 static int       quadwidth(int64_t);
  79 static char     *makenetvfslist(void);
  80 static void      prthuman(struct statvfs *, int64_t);
  81 static void      prthumanval(int64_t);
  82 static void      prtstat(struct statfs *, struct statvfs *, struct maxwidths *);
  83 static long      regetmntinfo(struct statfs **, struct statvfs **, long, char **);
  84 static void      update_maxwidths(struct maxwidths *, struct statfs *, struct statvfs *);
  85 static void      usage(void);
  86
  87 int     aflag = 0, hflag, iflag, nflag, Tflag;
  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:T")) != -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 'T':
 168                         Tflag = 1;
 169                         break;
 170                 case '?':
 171                 default:
 172                         usage();
 173                 }
 174         argc -= optind;
 175         argv += optind;
 176
 177         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 178         bzero(&maxwidths, sizeof(maxwidths));
 179         for (i = 0; i < mntsize; i++)
 180                 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 181
 182         rv = 0;
 183         if (!*argv) {
 184                 mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist);
 185                 bzero(&maxwidths, sizeof(maxwidths));
 186                 for (i = 0; i < mntsize; i++)
 187                         update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 188                 for (i = 0; i < mntsize; i++) {
 189                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 190                                 prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths);
 191                 }
 192                 exit(rv);
 193         }
 194
 195         for (; *argv; argv++) {
 196                 if (stat(*argv, &stbuf) < 0) {
 197                         if ((mntpt = getmntpt(*argv)) == NULL) {
 198                                 warn("%s", *argv);
 199                                 rv = 1;
 200                                 continue;
 201                         }
 202                 } else if (S_ISCHR(stbuf.st_mode)) {
 203                         if ((mntpt = getmntpt(*argv)) == NULL) {
 204                                 mdev.fspec = *argv;
 205                                 mntpath = strdup("/tmp/df.XXXXXX");
 206                                 if (mntpath == NULL) {
 207                                         warn("strdup failed");
 208                                         rv = 1;
 209                                         continue;
 210                                 }
 211                                 mntpt = mkdtemp(mntpath);
 212                                 if (mntpt == NULL) {
 213                                         warn("mkdtemp(\"%s\") failed", mntpath);
 214                                         rv = 1;
 215                                         free(mntpath);
 216                                         continue;
 217                                 }
 218                                 if (mount(fstype, mntpt, MNT_RDONLY,
 219                                     &mdev) != 0) {
 220                                         warn("%s", *argv);
 221                                         rv = 1;
 222                                         rmdir(mntpt);
 223                                         free(mntpath);
 224                                         continue;
 225                                 } else if (statfs(mntpt, &statfsbuf) == 0 &&
 226                                            statvfs(mntpt, &statvfsbuf) == 0) {
 227                                         statfsbuf.f_mntonname[0] = '\0';
 228                                         prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 229                                 } else {
 230                                         warn("%s", *argv);
 231                                         rv = 1;
 232                                 }
 233                                 unmount(mntpt, 0);
 234                                 rmdir(mntpt);
 235                                 free(mntpath);
 236                                 continue;
 237                         }
 238                 } else
 239                         mntpt = *argv;
 240                 /*
 241                  * Statfs does not take a `wait' flag, so we cannot
 242                  * implement nflag here.
 243                  */
 244                 if (statfs(mntpt, &statfsbuf) < 0) {
 245                         warn("%s", mntpt);
 246                         rv = 1;
 247                         continue;
 248                 }
 249                 if (statvfs(mntpt, &statvfsbuf) < 0) {
 250                         warn("%s", mntpt);
 251                         rv = 1;
 252                         continue;
 253                 }
 254                 /*
 255                  * Check to make sure the arguments we've been given are
 256                  * satisfied. Return an error if we have been asked to
 257                  * list a mount point that does not match the other args
 258                  * we've been given (-l, -t, etc.).
 259                  */
 260                 if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
 261                         rv = 1;
 262                         continue;
 263                 }
 264
 265                 if (argc == 1) {
 266                         bzero(&maxwidths, sizeof(maxwidths));
 267                         update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf);
 268                 }
 269                 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 270         }
 271         return (rv);
 272 }
 273
 274 static char *
 275 getmntpt(char *name)
 276 {
 277         long mntsize, i;
 278         struct statfs *mntbuf;
 279         struct statvfs *mntvbuf;
 280
 281         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 282         for (i = 0; i < mntsize; i++) {
 283                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 284                         return (mntbuf[i].f_mntonname);
 285         }
 286         return (0);
 287 }
 288
 289 /*
 290  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 291  * filesystem types not in vfslist and possibly re-stating to get
 292  * current (not cached) info.  Returns the new count of valid statfs bufs.
 293  */
 294 static long
 295 regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist)
 296 {
 297         int i, j;
 298         struct statfs *mntbuf;
 299         struct statvfs *mntvbuf;
 300
 301         if (vfslist == NULL)
 302                 return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT));
 303
 304         mntbuf = *mntbufp;
 305         mntvbuf = *mntvbufp;
 306         for (j = 0, i = 0; i < mntsize; i++) {
 307                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 308                         continue;
 309                 if (!nflag) {
 310                         statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 311                         statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]);
 312                 } else if (i != j) {
 313                         mntbuf[j] = mntbuf[i];
 314                         mntvbuf[j] = mntvbuf[i];
 315                 }
 316                 j++;
 317         }
 318         return (j);
 319 }
 320
 321 static void
 322 prthuman(struct statvfs *vsfsp, int64_t used)
 323 {
 324         prthumanval(vsfsp->f_blocks * vsfsp->f_bsize);
 325         prthumanval(used * vsfsp->f_bsize);
 326         prthumanval(vsfsp->f_bavail * vsfsp->f_bsize);
 327 }
 328
 329 static void
 330 prthumanval(int64_t bytes)
 331 {
 332         char buf[6];
 333         int flags;
 334
 335         flags = HN_B | HN_NOSPACE | HN_DECIMAL;
 336         if (hflag == UNITS_SI)
 337                 flags |= HN_DIVISOR_1000;
 338
 339         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 340             bytes, "", HN_AUTOSCALE, flags);
 341
 342         printf(" %6s", buf);
 343 }
 344
 345 /*
 346  * Print an inode count in "human-readable" format.
 347  */
 348 static void
 349 prthumanvalinode(int64_t bytes)
 350 {
 351         char buf[6];
 352         int flags;
 353
 354         flags = HN_NOSPACE | HN_DECIMAL | HN_DIVISOR_1000;
 355
 356         humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
 357             bytes, "", HN_AUTOSCALE, flags);
 358
 359         printf(" %5s", buf);
 360 }
 361
 362 /*
 363  * Convert statfs returned filesystem size into BLOCKSIZE units.
 364  * Attempts to avoid overflow for large filesystems.
 365  */
 366 static intmax_t
 367 fsbtoblk(int64_t num, uint64_t bsize, u_long reqbsize)
 368 {
 369         if (bsize != 0 && bsize < reqbsize)
 370                 return (num / (intmax_t)(reqbsize / bsize));
 371         else
 372                 return (num * (intmax_t)(bsize / reqbsize));
 373 }
 374
 375 /*
 376  * Print out status about a filesystem.
 377  */
 378 static void
 379 prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp)
 380 {
 381         static long blocksize;
 382         static int headerlen, timesthrough;
 383         static const char *header;
 384         int64_t used, availblks, inodes;
 385
 386         if (++timesthrough == 1) {
 387                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 388                 mwp->fstype = imax(mwp->fstype, strlen("Type"));
 389                 if (hflag) {
 390                         header = "  Size";
 391                         mwp->total = mwp->used = mwp->avail = strlen(header);
 392                 } else {
 393                         header = getbsize(&headerlen, &blocksize);
 394                         mwp->total = imax(mwp->total, headerlen);
 395                 }
 396                 mwp->used = imax(mwp->used, strlen("Used"));
 397                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 398
 399                 printf("%-*s", mwp->mntfrom, "Filesystem");
 400                 if (Tflag)
 401                         printf("  %-*s", mwp->fstype, "Type");
 402                 printf(" %-*s %*s %*s Capacity", mwp->total, header, mwp->used,
 403                     "Used", mwp->avail, "Avail");
 404                 if (iflag) {
 405                         mwp->iused = imax(hflag ? 0 : mwp->iused,
 406                             (int)strlen("  iused"));
 407                         mwp->ifree = imax(hflag ? 0 : mwp->ifree,
 408                             (int)strlen("ifree"));
 409                         printf(" %*s %*s %%iused", mwp->iused - 2,
 410                             "iused", mwp->ifree, "ifree");
 411                 }
 412                 printf("  Mounted on\n");
 413         }
 414         printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 415         if (Tflag)
 416                 printf("  %-*s", mwp->fstype, sfsp->f_fstypename);
 417         used = vsfsp->f_blocks - vsfsp->f_bfree;
 418         availblks = vsfsp->f_bavail + used;
 419         if (hflag) {
 420                 prthuman(vsfsp, used);
 421         } else {
 422                 printf(" %*jd %*jd %*jd", mwp->total,
 423                     fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize),
 424                     mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize),
 425                     mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize,
 426                     blocksize));
 427         }
 428         printf(" %5.0f%%",
 429             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 430         if (iflag) {
 431                 inodes = vsfsp->f_files;
 432                 used = inodes - vsfsp->f_ffree;
 433                 if (hflag) {
 434                         printf("  ");
 435                         prthumanvalinode(used);
 436                         prthumanvalinode(vsfsp->f_ffree);
 437                 } else {
 438                         printf(" %*jd %*jd", mwp->iused, (intmax_t)used,
 439                             mwp->ifree, (intmax_t)vsfsp->f_ffree);
 440                 }
 441                 printf(" %4.0f%% ", inodes == 0 ? 100.0 :
 442                     (double)used / (double)inodes * 100.0);
 443         } else
 444                 printf("  ");
 445         printf("  %s\n", sfsp->f_mntonname);
 446 }
 447
 448 /*
 449  * Update the maximum field-width information in `mwp' based on
 450  * the filesystem specified by `sfsp'.
 451  */
 452 static void
 453 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp)
 454 {
 455         static long blocksize;
 456         int dummy;
 457
 458         if (blocksize == 0)
 459                 getbsize(&dummy, &blocksize);
 460
 461         mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
 462         mwp->fstype = imax(mwp->fstype, strlen(sfsp->f_fstypename));
 463         mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks,
 464             vsfsp->f_bsize, blocksize)));
 465         mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks -
 466             vsfsp->f_bfree, vsfsp->f_bsize, blocksize)));
 467         mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail,
 468             vsfsp->f_bsize, blocksize)));
 469         mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files -
 470             vsfsp->f_ffree));
 471         mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree));
 472 }
 473
 474 /* Return the width in characters of the specified long. */
 475 static int
 476 quadwidth(int64_t val)
 477 {
 478         int len;
 479
 480         len = 0;
 481         /* Negative or zero values require one extra digit. */
 482         if (val <= 0) {
 483                 val = -val;
 484                 len++;
 485         }
 486         while (val > 0) {
 487                 len++;
 488                 val /= 10;
 489         }
 490         return (len);
 491 }
 492
 493 static void
 494 usage(void)
 495 {
 496
 497         fprintf(stderr,
 498             "usage: df [-b | -H | -h | -k | -m | -P] [-ailnT] [-t type] [file | filesystem ...]\n");
 499         exit(EX_USAGE);
 500 }
 501
 502 static char *
 503 makenetvfslist(void)
 504 {
 505         char *str, *strptr, **listptr;
 506         int mib[3], maxvfsconf, cnt=0, i;
 507         size_t miblen;
 508         struct ovfsconf *ptr;
 509
 510         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 511         miblen=sizeof(maxvfsconf);
 512         if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
 513             &maxvfsconf, &miblen, NULL, 0)) {
 514                 warnx("sysctl failed");
 515                 return (NULL);
 516         }
 517
 518         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 519                 warnx("malloc failed");
 520                 return (NULL);
 521         }
 522
 523         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 524                 if (ptr->vfc_flags & VFCF_NETWORK) {
 525                         listptr[cnt++] = strdup(ptr->vfc_name);
 526                         if (listptr[cnt-1] == NULL) {
 527                                 warnx("malloc failed");
 528                                 free(listptr);
 529                                 return (NULL);
 530                         }
 531                 }
 532
 533         if (cnt == 0 ||
 534             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 535                 if (cnt > 0)
 536                         warnx("malloc failed");
 537                 free(listptr);
 538                 return (NULL);
 539         }
 540
 541         *str = 'n'; *(str + 1) = 'o';
 542         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 543                 strncpy(strptr, listptr[i], 32);
 544                 strptr += strlen(listptr[i]);
 545                 *strptr = ',';
 546                 free(listptr[i]);
 547         }
 548         *(--strptr) = '\0';
 549
 550         free(listptr);
 551         return (str);
 552 }