df.c revision 1.41
1 /* $NetBSD: df.c,v 1.41 2001/10/11 09:23:31 enami 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 1.41 2001/10/11 09:23:31 enami 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(u_long, u_long, u_int); 71 72 int main(int, char *[]); 73 int bread(off_t, void *, int); 74 char *getmntpt(char *); 75 void prtstat(struct statfs *, int); 76 int ufs_df(char *, struct statfs *); 77 int selected(const char *); 78 void maketypelist(char *); 79 long regetmntinfo(struct statfs **, long); 80 void usage(void); 81 82 int aflag, iflag, kflag, lflag, mflag, nflag, Pflag; 83 char **typelist = NULL; 84 struct ufs_args mdev; 85 86 int 87 main(int argc, char *argv[]) 88 { 89 struct stat stbuf; 90 struct statfs *mntbuf; 91 long mntsize; 92 int ch, i, maxwidth, width; 93 char *mntpt; 94 95 while ((ch = getopt(argc, argv, "aiklmnPt:")) != -1) 96 switch (ch) { 97 case 'a': 98 aflag = 1; 99 break; 100 case 'i': 101 iflag = 1; 102 break; 103 case 'k': 104 kflag = 1; 105 break; 106 case 'l': 107 lflag = 1; 108 break; 109 case 'm': 110 mflag = 1; 111 break; 112 case 'n': 113 nflag = 1; 114 break; 115 case 'P': 116 Pflag = 1; 117 break; 118 case 't': 119 if (typelist != NULL) 120 errx(1, "only one -t option may be specified."); 121 maketypelist(optarg); 122 break; 123 case '?': 124 default: 125 usage(); 126 } 127 argc -= optind; 128 argv += optind; 129 130 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 131 if (mntsize == 0) 132 err(1, "retrieving information on mounted file systems"); 133 134 if (*argv == NULL) { 135 mntsize = regetmntinfo(&mntbuf, mntsize); 136 } else { 137 mntbuf = malloc(argc * sizeof(struct statfs)); 138 mntsize = 0; 139 for (; *argv != NULL; argv++) { 140 if (stat(*argv, &stbuf) < 0) { 141 if ((mntpt = getmntpt(*argv)) == 0) { 142 warn("%s", *argv); 143 continue; 144 } 145 } else if (S_ISCHR(stbuf.st_mode)) { 146 if (!ufs_df(*argv, &mntbuf[mntsize])) 147 ++mntsize; 148 continue; 149 } else if (S_ISBLK(stbuf.st_mode)) { 150 if ((mntpt = getmntpt(*argv)) == 0) { 151 mntpt = strdup("/tmp/df.XXXXXX"); 152 if (!mkdtemp(mntpt)) { 153 warn("%s", mntpt); 154 continue; 155 } 156 mdev.fspec = *argv; 157 if (mount(MOUNT_FFS, mntpt, MNT_RDONLY, 158 &mdev) != 0) { 159 (void)rmdir(mntpt); 160 if (!ufs_df(*argv, 161 &mntbuf[mntsize])) 162 ++mntsize; 163 continue; 164 } else if (!statfs(mntpt, 165 &mntbuf[mntsize])) { 166 mntbuf[mntsize].f_mntonname[0] = 167 '\0'; 168 ++mntsize; 169 } else 170 warn("%s", *argv); 171 (void)unmount(mntpt, 0); 172 (void)rmdir(mntpt); 173 continue; 174 } 175 } else 176 mntpt = *argv; 177 /* 178 * Statfs does not take a `wait' flag, so we cannot 179 * implement nflag here. 180 */ 181 if (!statfs(mntpt, &mntbuf[mntsize])) 182 if (lflag && 183 (mntbuf[mntsize].f_flags & MNT_LOCAL) == 0) 184 warnx("Warning: %s is not a local %s", 185 *argv, "file system"); 186 else if 187 (!selected(mntbuf[mntsize].f_fstypename)) 188 warnx("Warning: %s mounted as a %s %s", 189 *argv, 190 mntbuf[mntsize].f_fstypename, 191 "file system"); 192 else 193 ++mntsize; 194 else 195 warn("%s", *argv); 196 } 197 } 198 199 maxwidth = 0; 200 for (i = 0; i < mntsize; i++) { 201 width = strlen(mntbuf[i].f_mntfromname); 202 if (width > maxwidth) 203 maxwidth = width; 204 } 205 for (i = 0; i < mntsize; i++) 206 prtstat(&mntbuf[i], maxwidth); 207 exit(0); 208 /* NOTREACHED */ 209 } 210 211 char * 212 getmntpt(char *name) 213 { 214 long mntsize, i; 215 struct statfs *mntbuf; 216 217 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 218 for (i = 0; i < mntsize; i++) { 219 if (!strcmp(mntbuf[i].f_mntfromname, name)) 220 return (mntbuf[i].f_mntonname); 221 } 222 return (0); 223 } 224 225 static enum { IN_LIST, NOT_IN_LIST } which; 226 227 int 228 selected(const char *type) 229 { 230 char **av; 231 232 /* If no type specified, it's always selected. */ 233 if (typelist == NULL) 234 return (1); 235 for (av = typelist; *av != NULL; ++av) 236 if (!strncmp(type, *av, MFSNAMELEN)) 237 return (which == IN_LIST ? 1 : 0); 238 return (which == IN_LIST ? 0 : 1); 239 } 240 241 void 242 maketypelist(char *fslist) 243 { 244 int i; 245 char *nextcp, **av; 246 247 if ((fslist == NULL) || (fslist[0] == '\0')) 248 errx(1, "empty type list"); 249 250 /* 251 * XXX 252 * Note: the syntax is "noxxx,yyy" for no xxx's and 253 * no yyy's, not the more intuitive "noyyy,noyyy". 254 */ 255 if (fslist[0] == 'n' && fslist[1] == 'o') { 256 fslist += 2; 257 which = NOT_IN_LIST; 258 } else 259 which = IN_LIST; 260 261 /* Count the number of types. */ 262 for (i = 1, nextcp = fslist; 263 (nextcp = strchr(nextcp, ',')) != NULL; i++) 264 ++nextcp; 265 266 /* Build an array of that many types. */ 267 if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL) 268 err(1, "can't allocate type array"); 269 av[0] = fslist; 270 for (i = 1, nextcp = fslist; 271 (nextcp = strchr(nextcp, ',')) != NULL; i++) { 272 *nextcp = '\0'; 273 av[i] = ++nextcp; 274 } 275 /* Terminate the array. */ 276 av[i] = NULL; 277 } 278 279 /* 280 * Make a pass over the filesystem info in ``mntbuf'' filtering out 281 * filesystem types not in ``fsmask'' and possibly re-stating to get 282 * current (not cached) info. Returns the new count of valid statfs bufs. 283 */ 284 long 285 regetmntinfo(struct statfs **mntbufp, long mntsize) 286 { 287 int i, j; 288 struct statfs *mntbuf; 289 290 if (!lflag && typelist == NULL) 291 return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT)); 292 293 mntbuf = *mntbufp; 294 j = 0; 295 for (i = 0; i < mntsize; i++) { 296 if (!aflag && (mntbuf[i].f_flags & MNT_IGNORE) != 0) 297 continue; 298 if (lflag && (mntbuf[i].f_flags & MNT_LOCAL) == 0) 299 continue; 300 if (!selected(mntbuf[i].f_fstypename)) 301 continue; 302 if (nflag) 303 mntbuf[j] = mntbuf[i]; 304 else { 305 struct statfs layerbuf = mntbuf[i]; 306 (void)statfs(mntbuf[i].f_mntonname, &mntbuf[j]); 307 /* 308 * If the FS name changed, then new data is for 309 * a different layer and we don't want it. 310 */ 311 if (memcmp(layerbuf.f_mntfromname, 312 mntbuf[j].f_mntfromname, MNAMELEN)) 313 mntbuf[j] = layerbuf; 314 } 315 j++; 316 } 317 return (j); 318 } 319 320 /* 321 * Convert statfs returned filesystem size into BLOCKSIZE units. 322 * Attempts to avoid overflow for large filesystems. 323 */ 324 #define fsbtoblk(num, fsbs, bs) \ 325 (((fsbs) != 0 && (fsbs) < (bs)) ? \ 326 (num) / ((bs) / (fsbs)) : (num) * ((fsbs) / (bs))) 327 328 /* 329 * Print out status about a filesystem. 330 */ 331 void 332 prtstat(struct statfs *sfsp, int maxwidth) 333 { 334 static long blocksize; 335 static int headerlen, timesthrough; 336 static char *header; 337 long used, availblks, inodes; 338 static char *full = "100%"; 339 340 if (maxwidth < 11) 341 maxwidth = 11; 342 if (++timesthrough == 1) { 343 if (kflag) { 344 blocksize = 1024; 345 header = Pflag ? "1024-blocks" : "1K-blocks"; 346 headerlen = strlen(header); 347 } else if (mflag) { 348 blocksize = 1024 * 1024; 349 header = Pflag ? "1048576-blocks" : "1M-blocks"; 350 headerlen = strlen(header); 351 } else 352 header = getbsize(&headerlen, &blocksize); 353 (void)printf("%-*.*s %s Used %9s Capacity", 354 maxwidth, maxwidth, "Filesystem", header, 355 Pflag ? "Available" : "Avail"); 356 if (iflag) 357 (void)printf(" iused ifree %%iused"); 358 (void)printf(" Mounted on\n"); 359 } 360 (void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname); 361 used = sfsp->f_blocks - sfsp->f_bfree; 362 availblks = sfsp->f_bavail + used; 363 (void)printf(" %*ld %8ld %9ld", headerlen, 364 fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize), 365 fsbtoblk(used, sfsp->f_bsize, blocksize), 366 fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize)); 367 (void)printf("%7s", 368 availblks == 0 ? full : strpct((u_long)used, (u_long)availblks, 0)); 369 if (iflag) { 370 inodes = sfsp->f_files; 371 used = inodes - sfsp->f_ffree; 372 (void)printf(" %7ld %7ld %6s ", used, sfsp->f_ffree, 373 inodes == 0 ? full : 374 strpct((u_long)used, (u_long)inodes, 0)); 375 } else 376 (void)printf(" "); 377 (void)printf(" %s\n", sfsp->f_mntonname); 378 } 379 380 /* 381 * This code constitutes the pre-system call Berkeley df code for extracting 382 * information from filesystem superblocks. 383 */ 384 #include <ufs/ufs/dinode.h> 385 #include <ufs/ffs/fs.h> 386 #include <errno.h> 387 #include <fstab.h> 388 389 union { 390 struct fs iu_fs; 391 char dummy[SBSIZE]; 392 } sb; 393 #define sblock sb.iu_fs 394 395 int rfd; 396 397 int 398 ufs_df(char *file, struct statfs *sfsp) 399 { 400 char *mntpt; 401 static int synced; 402 403 if (synced++ == 0) 404 sync(); 405 406 if ((rfd = open(file, O_RDONLY)) < 0) { 407 warn("%s", file); 408 return (-1); 409 } 410 if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) { 411 (void)close(rfd); 412 return (-1); 413 } 414 sfsp->f_type = 0; 415 sfsp->f_flags = 0; 416 sfsp->f_bsize = sblock.fs_fsize; 417 sfsp->f_iosize = sblock.fs_bsize; 418 sfsp->f_blocks = sblock.fs_dsize; 419 sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag + 420 sblock.fs_cstotal.cs_nffree; 421 sfsp->f_bavail = 422 ((int64_t)sblock.fs_dsize * (100 - sblock.fs_minfree) / 100) - 423 (sblock.fs_dsize - sfsp->f_bfree); 424 if (sfsp->f_bavail < 0) 425 sfsp->f_bavail = 0; 426 sfsp->f_files = sblock.fs_ncg * sblock.fs_ipg; 427 sfsp->f_ffree = sblock.fs_cstotal.cs_nifree; 428 sfsp->f_fsid.val[0] = 0; 429 sfsp->f_fsid.val[1] = 0; 430 if ((mntpt = getmntpt(file)) == 0) 431 mntpt = ""; 432 (void)memmove(&sfsp->f_mntonname[0], mntpt, MNAMELEN); 433 (void)memmove(&sfsp->f_mntfromname[0], file, MNAMELEN); 434 (void)strncpy(sfsp->f_fstypename, MOUNT_FFS, MFSNAMELEN); 435 (void)close(rfd); 436 return (0); 437 } 438 439 int 440 bread(off, buf, cnt) 441 off_t off; 442 void *buf; 443 int cnt; 444 { 445 int nr; 446 447 (void)lseek(rfd, off, SEEK_SET); 448 if ((nr = read(rfd, buf, cnt)) != cnt) { 449 /* Probably a dismounted disk if errno == EIO. */ 450 if (errno != EIO) 451 (void)fprintf(stderr, "\ndf: %lld: %s\n", 452 (long long)off, strerror(nr > 0 ? EIO : errno)); 453 return (0); 454 } 455 return (1); 456 } 457 458 void 459 usage(void) 460 { 461 462 (void)fprintf(stderr, 463 "Usage: %s [-aiklmnP] [-t type] [file | file_system ...]\n", 464 getprogname()); 465 exit(1); 466 /* NOTREACHED */ 467 } 468
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