df.c revision 1.38
1 /* $NetBSD: df.c,v 1.38 2001/01/07 05:37:10 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 41 #include <sys/cdefs.h> 42 #ifndef lint 43 __COPYRIGHT( 44 "@(#) Copyright (c) 1980, 1990, 1993, 1994\n\ 45 The Regents of the University of California. All rights reserved.\n"); 46 #endif /* not lint */ 47 48 #ifndef lint 49 #if 0 50 static char sccsid[] = "@(#)df.c 8.7 (Berkeley) 4/2/94"; 51 #else 52 __RCSID("$NetBSD: df.c,v 1.38 2001/01/07 05:37:10 christos Exp $"); 53 #endif 54 #endif /* not lint */ 55 56 #include <sys/param.h> 57 #include <sys/stat.h> 58 #include <sys/mount.h> 59 60 #include <ufs/ufs/ufsmount.h> 61 62 #include <err.h> 63 #include <errno.h> 64 #include <fcntl.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <unistd.h> 69 70 extern char * strpct __P((u_long num, u_long denom, u_int digits)); 71 extern char *__progname; 72 73 int main __P((int, char *[])); 74 int bread __P((off_t, void *, int)); 75 char *getmntpt __P((char *)); 76 void prtstat __P((struct statfs *, int)); 77 int ufs_df __P((char *, struct statfs *)); 78 int selected __P((const char *)); 79 void maketypelist __P((char *)); 80 long regetmntinfo __P((struct statfs **, long)); 81 void usage __P((void)); 82 83 int aflag, iflag, kflag, lflag, mflag, nflag, Pflag; 84 char **typelist = NULL; 85 struct ufs_args mdev; 86 87 int 88 main(argc, argv) 89 int argc; 90 char *argv[]; 91 { 92 struct stat stbuf; 93 struct statfs *mntbuf; 94 long mntsize; 95 int ch, i, maxwidth, width; 96 char *mntpt; 97 98 while ((ch = getopt(argc, argv, "aiklmnPt:")) != -1) 99 switch (ch) { 100 case 'a': 101 aflag = 1; 102 break; 103 case 'i': 104 iflag = 1; 105 break; 106 case 'k': 107 kflag = 1; 108 break; 109 case 'l': 110 lflag = 1; 111 break; 112 case 'm': 113 mflag = 1; 114 break; 115 case 'n': 116 nflag = 1; 117 break; 118 case 'P': 119 Pflag = 1; 120 break; 121 case 't': 122 if (typelist != NULL) 123 errx(1, "only one -t option may be specified."); 124 maketypelist(optarg); 125 break; 126 case '?': 127 default: 128 usage(); 129 } 130 argc -= optind; 131 argv += optind; 132 133 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 134 if (mntsize == 0) 135 err(1, "retrieving information on mounted file systems"); 136 137 if (!*argv) { 138 mntsize = regetmntinfo(&mntbuf, mntsize); 139 } else { 140 mntbuf = malloc(argc * sizeof(struct statfs)); 141 mntsize = 0; 142 for (; *argv; argv++) { 143 if (stat(*argv, &stbuf) < 0) { 144 if ((mntpt = getmntpt(*argv)) == 0) { 145 warn("%s", *argv); 146 continue; 147 } 148 } else if (S_ISCHR(stbuf.st_mode)) { 149 if (!ufs_df(*argv, &mntbuf[mntsize])) 150 ++mntsize; 151 continue; 152 } else if (S_ISBLK(stbuf.st_mode)) { 153 if ((mntpt = getmntpt(*argv)) == 0) { 154 mntpt = strdup("/tmp/df.XXXXXX"); 155 if (!mkdtemp(mntpt)) { 156 warn("%s", mntpt); 157 continue; 158 } 159 mdev.fspec = *argv; 160 if (mount(MOUNT_FFS, mntpt, MNT_RDONLY, 161 &mdev) != 0) { 162 (void)rmdir(mntpt); 163 if (!ufs_df(*argv, 164 &mntbuf[mntsize])) 165 ++mntsize; 166 continue; 167 } else if (!statfs(mntpt, 168 &mntbuf[mntsize])) { 169 mntbuf[mntsize].f_mntonname[0] = 170 '\0'; 171 ++mntsize; 172 } else 173 warn("%s", *argv); 174 (void)unmount(mntpt, 0); 175 (void)rmdir(mntpt); 176 continue; 177 } 178 } else 179 mntpt = *argv; 180 /* 181 * Statfs does not take a `wait' flag, so we cannot 182 * implement nflag here. 183 */ 184 if (!statfs(mntpt, &mntbuf[mntsize])) 185 if (lflag && 186 (mntbuf[mntsize].f_flags & MNT_LOCAL) == 0) 187 warnx("Warning: %s is not a local %s", 188 *argv, "file system"); 189 else if 190 (!selected(mntbuf[mntsize].f_fstypename)) 191 warnx("Warning: %s mounted as a %s %s", 192 *argv, 193 mntbuf[mntsize].f_fstypename, 194 "file system"); 195 else 196 ++mntsize; 197 else 198 warn("%s", *argv); 199 } 200 } 201 202 maxwidth = 0; 203 for (i = 0; i < mntsize; i++) { 204 width = strlen(mntbuf[i].f_mntfromname); 205 if (width > maxwidth) 206 maxwidth = width; 207 } 208 for (i = 0; i < mntsize; i++) 209 prtstat(&mntbuf[i], maxwidth); 210 exit(0); 211 /* NOTREACHED */ 212 } 213 214 char * 215 getmntpt(name) 216 char *name; 217 { 218 long mntsize, i; 219 struct statfs *mntbuf; 220 221 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 222 for (i = 0; i < mntsize; i++) { 223 if (!strcmp(mntbuf[i].f_mntfromname, name)) 224 return (mntbuf[i].f_mntonname); 225 } 226 return (0); 227 } 228 229 static enum { IN_LIST, NOT_IN_LIST } which; 230 231 int 232 selected(type) 233 const char *type; 234 { 235 char **av; 236 237 /* If no type specified, it's always selected. */ 238 if (typelist == NULL) 239 return (1); 240 for (av = typelist; *av != NULL; ++av) 241 if (!strncmp(type, *av, MFSNAMELEN)) 242 return (which == IN_LIST ? 1 : 0); 243 return (which == IN_LIST ? 0 : 1); 244 } 245 246 void 247 maketypelist(fslist) 248 char *fslist; 249 { 250 int i; 251 char *nextcp, **av; 252 253 if ((fslist == NULL) || (fslist[0] == '\0')) 254 errx(1, "empty type list"); 255 256 /* 257 * XXX 258 * Note: the syntax is "noxxx,yyy" for no xxx's and 259 * no yyy's, not the more intuitive "noyyy,noyyy". 260 */ 261 if (fslist[0] == 'n' && fslist[1] == 'o') { 262 fslist += 2; 263 which = NOT_IN_LIST; 264 } else 265 which = IN_LIST; 266 267 /* Count the number of types. */ 268 for (i = 1, nextcp = fslist; 269 (nextcp = strchr(nextcp, ',')) != NULL; i++) 270 ++nextcp; 271 272 /* Build an array of that many types. */ 273 if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL) 274 err(1, "can't allocate type array"); 275 av[0] = fslist; 276 for (i = 1, nextcp = fslist; 277 (nextcp = strchr(nextcp, ',')) != NULL; i++) { 278 *nextcp = '\0'; 279 av[i] = ++nextcp; 280 } 281 /* Terminate the array. */ 282 av[i] = NULL; 283 } 284 285 /* 286 * Make a pass over the filesystem info in ``mntbuf'' filtering out 287 * filesystem types not in ``fsmask'' and possibly re-stating to get 288 * current (not cached) info. Returns the new count of valid statfs bufs. 289 */ 290 long 291 regetmntinfo(mntbufp, mntsize) 292 struct statfs **mntbufp; 293 long mntsize; 294 { 295 int i, j; 296 struct statfs *mntbuf; 297 298 if (!lflag && typelist == NULL) 299 return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT)); 300 301 mntbuf = *mntbufp; 302 j = 0; 303 for (i = 0; i < mntsize; i++) { 304 if (!aflag && (mntbuf[i].f_flags & MNT_IGNORE) != 0) 305 continue; 306 if (lflag && (mntbuf[i].f_flags & MNT_LOCAL) == 0) 307 continue; 308 if (!selected(mntbuf[i].f_fstypename)) 309 continue; 310 if (nflag) 311 mntbuf[j] = mntbuf[i]; 312 else { 313 struct statfs layerbuf = mntbuf[i]; 314 (void)statfs(mntbuf[i].f_mntonname, &mntbuf[j]); 315 /* 316 * If the FS name changed, then new data is for 317 * a different layer and we don't want it. 318 */ 319 if(memcmp(layerbuf.f_mntfromname, 320 mntbuf[j].f_mntfromname, MNAMELEN)) 321 mntbuf[j] = layerbuf; 322 } 323 j++; 324 } 325 return (j); 326 } 327 328 /* 329 * Convert statfs returned filesystem size into BLOCKSIZE units. 330 * Attempts to avoid overflow for large filesystems. 331 */ 332 #define fsbtoblk(num, fsbs, bs) \ 333 (((fsbs) != 0 && (fsbs) < (bs)) ? \ 334 (num) / ((bs) / (fsbs)) : (num) * ((fsbs) / (bs))) 335 336 /* 337 * Print out status about a filesystem. 338 */ 339 void 340 prtstat(sfsp, maxwidth) 341 struct statfs *sfsp; 342 int maxwidth; 343 { 344 static long blocksize; 345 static int headerlen, timesthrough; 346 static char *header; 347 long used, availblks, inodes; 348 static char *full = "100%"; 349 350 if (maxwidth < 11) 351 maxwidth = 11; 352 if (++timesthrough == 1) { 353 if (kflag) { 354 blocksize = 1024; 355 header = Pflag ? "1024-blocks" : "1K-blocks"; 356 headerlen = strlen(header); 357 } else if (mflag) { 358 blocksize = 1024 * 1024; 359 header = Pflag ? "1048576-blocks" : "1M-blocks"; 360 headerlen = strlen(header); 361 } else 362 header = getbsize(&headerlen, &blocksize); 363 (void)printf("%-*.*s %s Used %9s Capacity", 364 maxwidth, maxwidth, "Filesystem", header, 365 Pflag ? "Available" : "Avail"); 366 if (iflag) 367 (void)printf(" iused ifree %%iused"); 368 (void)printf(" Mounted on\n"); 369 } 370 (void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname); 371 used = sfsp->f_blocks - sfsp->f_bfree; 372 availblks = sfsp->f_bavail + used; 373 (void)printf(" %*ld %8ld %9ld", headerlen, 374 fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize), 375 fsbtoblk(used, sfsp->f_bsize, blocksize), 376 fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize)); 377 (void)printf("%9s", 378 availblks == 0 ? full : strpct((u_long)used, (u_long)availblks, 0)); 379 if (iflag) { 380 inodes = sfsp->f_files; 381 used = inodes - sfsp->f_ffree; 382 (void)printf(" %7ld %7ld %6s ", used, sfsp->f_ffree, 383 inodes == 0 ? full : strpct((u_long)used, (u_long)inodes, 0)); 384 } else 385 (void)printf(" "); 386 (void)printf(" %s\n", sfsp->f_mntonname); 387 } 388 389 /* 390 * This code constitutes the pre-system call Berkeley df code for extracting 391 * information from filesystem superblocks. 392 */ 393 #include <ufs/ufs/dinode.h> 394 #include <ufs/ffs/fs.h> 395 #include <errno.h> 396 #include <fstab.h> 397 398 union { 399 struct fs iu_fs; 400 char dummy[SBSIZE]; 401 } sb; 402 #define sblock sb.iu_fs 403 404 int rfd; 405 406 int 407 ufs_df(file, sfsp) 408 char *file; 409 struct statfs *sfsp; 410 { 411 char *mntpt; 412 static int synced; 413 414 if (synced++ == 0) 415 sync(); 416 417 if ((rfd = open(file, O_RDONLY)) < 0) { 418 warn("%s", file); 419 return (-1); 420 } 421 if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) { 422 (void)close(rfd); 423 return (-1); 424 } 425 sfsp->f_type = 0; 426 sfsp->f_flags = 0; 427 sfsp->f_bsize = sblock.fs_fsize; 428 sfsp->f_iosize = sblock.fs_bsize; 429 sfsp->f_blocks = sblock.fs_dsize; 430 sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag + 431 sblock.fs_cstotal.cs_nffree; 432 sfsp->f_bavail = ((int64_t)sblock.fs_dsize * (100 - sblock.fs_minfree) / 100) - 433 (sblock.fs_dsize - sfsp->f_bfree); 434 if (sfsp->f_bavail < 0) 435 sfsp->f_bavail = 0; 436 sfsp->f_files = sblock.fs_ncg * sblock.fs_ipg; 437 sfsp->f_ffree = sblock.fs_cstotal.cs_nifree; 438 sfsp->f_fsid.val[0] = 0; 439 sfsp->f_fsid.val[1] = 0; 440 if ((mntpt = getmntpt(file)) == 0) 441 mntpt = ""; 442 (void)memmove(&sfsp->f_mntonname[0], mntpt, MNAMELEN); 443 (void)memmove(&sfsp->f_mntfromname[0], file, MNAMELEN); 444 (void)strncpy(sfsp->f_fstypename, MOUNT_FFS, MFSNAMELEN); 445 (void)close(rfd); 446 return (0); 447 } 448 449 int 450 bread(off, buf, cnt) 451 off_t off; 452 void *buf; 453 int cnt; 454 { 455 int nr; 456 457 (void)lseek(rfd, off, SEEK_SET); 458 if ((nr = read(rfd, buf, cnt)) != cnt) { 459 /* Probably a dismounted disk if errno == EIO. */ 460 if (errno != EIO) 461 (void)fprintf(stderr, "\ndf: %lld: %s\n", 462 (long long)off, strerror(nr > 0 ? EIO : errno)); 463 return (0); 464 } 465 return (1); 466 } 467 468 void 469 usage() 470 { 471 (void)fprintf(stderr, 472 "Usage: %s [-aiklmnP] [-t type] [file | file_system ...]\n", 473 __progname); 474 exit(1); 475 /* NOTREACHED */ 476 } 477
Indexes created Thu Oct 02 07:10:07 GMT 2025