df.c revision 1.21
1 /* $NetBSD: df.c,v 1.21 1995/08/11 00:38:15 jtc 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 #ifndef lint 42 static char copyright[] = 43 "@(#) Copyright (c) 1980, 1990, 1993, 1994\n\ 44 The Regents of the University of California. All rights reserved.\n"; 45 #endif /* not lint */ 46 47 #ifndef lint 48 #if 0 49 static char sccsid[] = "@(#)df.c 8.7 (Berkeley) 4/2/94"; 50 #else 51 static char rcsid[] = "$NetBSD: df.c,v 1.21 1995/08/11 00:38:15 jtc Exp $"; 52 #endif 53 #endif /* not lint */ 54 55 #include <sys/param.h> 56 #include <sys/stat.h> 57 #include <sys/mount.h> 58 59 #include <err.h> 60 #include <errno.h> 61 #include <fcntl.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <unistd.h> 66 67 int bread __P((off_t, void *, int)); 68 char *getmntpt __P((char *)); 69 void prtstat __P((struct statfs *, int)); 70 int ufs_df __P((char *, struct statfs *)); 71 int selected __P((const char *)); 72 void maketypelist __P((char *)); 73 long regetmntinfo __P((struct statfs **, long)); 74 void usage __P((void)); 75 76 int iflag, kflag, lflag, nflag; 77 char **typelist = NULL; 78 struct ufs_args mdev; 79 80 int 81 main(argc, argv) 82 int argc; 83 char *argv[]; 84 { 85 struct stat stbuf; 86 struct statfs *mntbuf; 87 long mntsize; 88 int ch, i, maxwidth, width; 89 char *mntpt; 90 91 while ((ch = getopt(argc, argv, "iklnt:")) != -1) 92 switch (ch) { 93 case 'i': 94 iflag = 1; 95 break; 96 case 'k': 97 kflag = 1; 98 break; 99 case 'l': 100 lflag = 1; 101 break; 102 case 'n': 103 nflag = 1; 104 break; 105 case 't': 106 if (typelist != NULL) 107 errx(1, "only one -t option may be specified."); 108 maketypelist(optarg); 109 break; 110 case '?': 111 default: 112 usage(); 113 } 114 argc -= optind; 115 argv += optind; 116 117 if (*argv && (lflag || typelist != NULL)) 118 errx(1, "-l or -t does not make sense with list of mount points"); 119 120 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 121 if (mntsize == 0) 122 err(1, "retrieving information on mounted file systems"); 123 124 if (!*argv) { 125 mntsize = regetmntinfo(&mntbuf, mntsize); 126 } else { 127 mntbuf = malloc(argc * sizeof(struct statfs)); 128 mntsize = 0; 129 for (; *argv; argv++) { 130 if (stat(*argv, &stbuf) < 0) { 131 if ((mntpt = getmntpt(*argv)) == 0) { 132 warn("%s", *argv); 133 continue; 134 } 135 } else if (S_ISCHR(stbuf.st_mode)) { 136 if (!ufs_df(*argv, &mntbuf[mntsize])) 137 ++mntsize; 138 continue; 139 } else if (S_ISBLK(stbuf.st_mode)) { 140 if ((mntpt = getmntpt(*argv)) == 0) { 141 mntpt = mktemp(strdup("/tmp/df.XXXXXX")); 142 mdev.fspec = *argv; 143 if (mkdir(mntpt, DEFFILEMODE) != 0) { 144 warn("%s", mntpt); 145 continue; 146 } 147 if (mount(MOUNT_UFS, mntpt, MNT_RDONLY, 148 &mdev) != 0) { 149 (void)rmdir(mntpt); 150 if (!ufs_df(*argv, &mntbuf[mntsize])) 151 ++mntsize; 152 continue; 153 } else if (!statfs(mntpt, &mntbuf[mntsize])) { 154 mntbuf[mntsize].f_mntonname[0] = '\0'; 155 ++mntsize; 156 } else 157 warn("%s", *argv); 158 (void)unmount(mntpt, 0); 159 (void)rmdir(mntpt); 160 continue; 161 } 162 } else 163 mntpt = *argv; 164 /* 165 * Statfs does not take a `wait' flag, so we cannot 166 * implement nflag here. 167 */ 168 if (!statfs(mntpt, &mntbuf[mntsize])) 169 ++mntsize; 170 else 171 warn("%s", *argv); 172 } 173 } 174 175 maxwidth = 0; 176 for (i = 0; i < mntsize; i++) { 177 width = strlen(mntbuf[i].f_mntfromname); 178 if (width > maxwidth) 179 maxwidth = width; 180 } 181 for (i = 0; i < mntsize; i++) 182 prtstat(&mntbuf[i], maxwidth); 183 exit(0); 184 } 185 186 char * 187 getmntpt(name) 188 char *name; 189 { 190 long mntsize, i; 191 struct statfs *mntbuf; 192 193 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 194 for (i = 0; i < mntsize; i++) { 195 if (!strcmp(mntbuf[i].f_mntfromname, name)) 196 return (mntbuf[i].f_mntonname); 197 } 198 return (0); 199 } 200 201 static enum { IN_LIST, NOT_IN_LIST } which; 202 203 int 204 selected(type) 205 const char *type; 206 { 207 char **av; 208 209 /* If no type specified, it's always selected. */ 210 if (typelist == NULL) 211 return (1); 212 for (av = typelist; *av != NULL; ++av) 213 if (!strncmp(type, *av, MFSNAMELEN)) 214 return (which == IN_LIST ? 1 : 0); 215 return (which == IN_LIST ? 0 : 1); 216 } 217 218 void 219 maketypelist(fslist) 220 char *fslist; 221 { 222 int i; 223 char *nextcp, **av; 224 225 if ((fslist == NULL) || (fslist[0] == '\0')) 226 errx(1, "empty type list"); 227 228 /* 229 * XXX 230 * Note: the syntax is "noxxx,yyy" for no xxx's and 231 * no yyy's, not the more intuitive "noyyy,noyyy". 232 */ 233 if (fslist[0] == 'n' && fslist[1] == 'o') { 234 fslist += 2; 235 which = NOT_IN_LIST; 236 } else 237 which = IN_LIST; 238 239 /* Count the number of types. */ 240 for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) 241 ++nextcp; 242 243 /* Build an array of that many types. */ 244 if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL) 245 err(1, NULL); 246 av[0] = fslist; 247 for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) { 248 *nextcp = '\0'; 249 av[i] = ++nextcp; 250 } 251 /* Terminate the array. */ 252 av[i] = NULL; 253 } 254 255 /* 256 * Make a pass over the filesystem info in ``mntbuf'' filtering out 257 * filesystem types not in ``fsmask'' and possibly re-stating to get 258 * current (not cached) info. Returns the new count of valid statfs bufs. 259 */ 260 long 261 regetmntinfo(mntbufp, mntsize) 262 struct statfs **mntbufp; 263 long mntsize; 264 { 265 int i, j; 266 struct statfs *mntbuf; 267 268 if (!lflag && typelist == NULL) 269 return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT)); 270 271 mntbuf = *mntbufp; 272 j = 0; 273 for (i = 0; i < mntsize; i++) { 274 if (lflag && (mntbuf[i].f_flags & MNT_LOCAL) == 0) 275 continue; 276 if (!selected(mntbuf[i].f_fstypename)) 277 continue; 278 if (nflag) 279 mntbuf[j] = mntbuf[i]; 280 else 281 (void)statfs(mntbuf[i].f_mntonname, &mntbuf[j]); 282 j++; 283 } 284 return (j); 285 } 286 287 /* 288 * Convert statfs returned filesystem size into BLOCKSIZE units. 289 * Attempts to avoid overflow for large filesystems. 290 */ 291 #define fsbtoblk(num, fsbs, bs) \ 292 (((fsbs) != 0 && (fsbs) < (bs)) ? \ 293 (num) / ((bs) / (fsbs)) : (num) * ((fsbs) / (bs))) 294 295 /* 296 * Print out status about a filesystem. 297 */ 298 void 299 prtstat(sfsp, maxwidth) 300 struct statfs *sfsp; 301 int maxwidth; 302 { 303 static long blocksize; 304 static int headerlen, timesthrough; 305 static char *header; 306 long used, availblks, inodes; 307 308 if (maxwidth < 11) 309 maxwidth = 11; 310 if (++timesthrough == 1) { 311 if (kflag) { 312 blocksize = 1024; 313 header = "1K-blocks"; 314 headerlen = strlen(header); 315 } else 316 header = getbsize(&headerlen, &blocksize); 317 (void)printf("%-*.*s %s Used Avail Capacity", 318 maxwidth, maxwidth, "Filesystem", header); 319 if (iflag) 320 (void)printf(" iused ifree %%iused"); 321 (void)printf(" Mounted on\n"); 322 } 323 (void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname); 324 used = sfsp->f_blocks - sfsp->f_bfree; 325 availblks = sfsp->f_bavail + used; 326 (void)printf(" %*ld %8ld %8ld", headerlen, 327 fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize), 328 fsbtoblk(used, sfsp->f_bsize, blocksize), 329 fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize)); 330 (void)printf(" %5.0f%%", 331 availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0); 332 if (iflag) { 333 inodes = sfsp->f_files; 334 used = inodes - sfsp->f_ffree; 335 (void)printf(" %7ld %7ld %5.0f%% ", used, sfsp->f_ffree, 336 inodes == 0 ? 100.0 : (double)used / (double)inodes * 100.0); 337 } else 338 (void)printf(" "); 339 (void)printf(" %s\n", sfsp->f_mntonname); 340 } 341 342 /* 343 * This code constitutes the pre-system call Berkeley df code for extracting 344 * information from filesystem superblocks. 345 */ 346 #include <ufs/ffs/fs.h> 347 #include <errno.h> 348 #include <fstab.h> 349 350 union { 351 struct fs iu_fs; 352 char dummy[SBSIZE]; 353 } sb; 354 #define sblock sb.iu_fs 355 356 int rfd; 357 358 int 359 ufs_df(file, sfsp) 360 char *file; 361 struct statfs *sfsp; 362 { 363 char *mntpt; 364 static int synced; 365 366 if (synced++ == 0) 367 sync(); 368 369 if ((rfd = open(file, O_RDONLY)) < 0) { 370 warn("%s", file); 371 return (-1); 372 } 373 if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) { 374 (void)close(rfd); 375 return (-1); 376 } 377 sfsp->f_type = 0; 378 sfsp->f_flags = 0; 379 sfsp->f_bsize = sblock.fs_fsize; 380 sfsp->f_iosize = sblock.fs_bsize; 381 sfsp->f_blocks = sblock.fs_dsize; 382 sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag + 383 sblock.fs_cstotal.cs_nffree; 384 sfsp->f_bavail = (sblock.fs_dsize * (100 - sblock.fs_minfree) / 100) - 385 (sblock.fs_dsize - sfsp->f_bfree); 386 if (sfsp->f_bavail < 0) 387 sfsp->f_bavail = 0; 388 sfsp->f_files = sblock.fs_ncg * sblock.fs_ipg; 389 sfsp->f_ffree = sblock.fs_cstotal.cs_nifree; 390 sfsp->f_fsid.val[0] = 0; 391 sfsp->f_fsid.val[1] = 0; 392 if ((mntpt = getmntpt(file)) == 0) 393 mntpt = ""; 394 memmove(&sfsp->f_mntonname[0], mntpt, MNAMELEN); 395 memmove(&sfsp->f_mntfromname[0], file, MNAMELEN); 396 strncpy(sfsp->f_fstypename, MOUNT_UFS, MFSNAMELEN); 397 (void)close(rfd); 398 return (0); 399 } 400 401 int 402 bread(off, buf, cnt) 403 off_t off; 404 void *buf; 405 int cnt; 406 { 407 int nr; 408 409 (void)lseek(rfd, off, SEEK_SET); 410 if ((nr = read(rfd, buf, cnt)) != cnt) { 411 /* Probably a dismounted disk if errno == EIO. */ 412 if (errno != EIO) 413 (void)fprintf(stderr, "\ndf: %qd: %s\n", 414 off, strerror(nr > 0 ? EIO : errno)); 415 return (0); 416 } 417 return (1); 418 } 419 420 void 421 usage() 422 { 423 (void)fprintf(stderr, "usage: df [-ikln] [-t type] [file | file_system ...]\n"); 424 exit(1); 425 } 426
Indexes created Wed Oct 01 19:09:53 GMT 2025