df.c revision 1.15
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 39 #ifndef lint 40 static char copyright[] = 41 "@(#) Copyright (c) 1980, 1990, 1993, 1994\n\ 42 The Regents of the University of California. All rights reserved.\n"; 43 #endif /* not lint */ 44 45 #ifndef lint 46 /*static char sccsid[] = "from: @(#)df.c 8.7 (Berkeley) 4/2/94";*/ 47 static char rcsid[] = "$Id: df.c,v 1.15 1994/09/16 20:59:29 mycroft Exp $"; 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/mount.h> 53 54 #include <err.h> 55 #include <errno.h> 56 #include <fcntl.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 int bread __P((off_t, void *, int)); 63 char *getmntpt __P((char *)); 64 void prtstat __P((struct statfs *, int)); 65 void ufs_df __P((char *, int)); 66 void usage __P((void)); 67 68 int iflag, kflag = 0, nflag, lflag; 69 long blocksize, mntsize; 70 struct statfs *mntbuf; 71 struct ufs_args mdev; 72 73 int 74 main(argc, argv) 75 int argc; 76 char *argv[]; 77 { 78 struct stat stbuf; 79 struct statfs statfsbuf; 80 long width, maxwidth; 81 int ch, i; 82 char *mntpt; 83 84 while ((ch = getopt(argc, argv, "ikln")) != EOF) 85 switch (ch) { 86 case 'i': 87 iflag = 1; 88 break; 89 case 'k': 90 blocksize = 1024; 91 kflag = 1; 92 break; 93 case 'l': 94 lflag = 1; 95 break; 96 case 'n': 97 nflag = 1; 98 break; 99 case '?': 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 if (*argv && lflag) 107 errx(1, "-l does not make sense with list of mount points"); 108 109 mntsize = getmntinfo(&mntbuf, (nflag ? MNT_NOWAIT : MNT_WAIT)); 110 if (mntsize == 0) 111 err(1, "retrieving information on mounted file systems"); 112 maxwidth = 0; 113 for (i = 0; i < mntsize; i++) { 114 width = strlen(mntbuf[i].f_mntfromname); 115 if (width > maxwidth) 116 maxwidth = width; 117 } 118 119 if (!*argv) { 120 for (i = 0; i < mntsize; i++) 121 if (!lflag || mntbuf[i].f_flags & MNT_LOCAL) 122 prtstat(&mntbuf[i], maxwidth); 123 exit(0); 124 } 125 126 for (; *argv; argv++) { 127 if (stat(*argv, &stbuf) < 0) { 128 if ((mntpt = getmntpt(*argv)) == 0) { 129 warn("%s", *argv); 130 continue; 131 } 132 } else if ((stbuf.st_mode & S_IFMT) == S_IFCHR) { 133 ufs_df(*argv, maxwidth); 134 continue; 135 } else if ((stbuf.st_mode & S_IFMT) == S_IFBLK) { 136 if ((mntpt = getmntpt(*argv)) == 0) { 137 mntpt = mktemp(strdup("/tmp/df.XXXXXX")); 138 mdev.fspec = *argv; 139 if (mkdir(mntpt, DEFFILEMODE) != 0) { 140 warn("%s", mntpt); 141 continue; 142 } 143 if (mount(MOUNT_UFS, mntpt, MNT_RDONLY, 144 &mdev) != 0) { 145 ufs_df(*argv, maxwidth); 146 (void)rmdir(mntpt); 147 continue; 148 } else if (statfs(mntpt, &statfsbuf)) { 149 statfsbuf.f_mntonname[0] = '\0'; 150 prtstat(&statfsbuf, maxwidth); 151 } else 152 warn("%s", *argv); 153 (void)unmount(mntpt, 0); 154 (void)rmdir(mntpt); 155 continue; 156 } 157 } else 158 mntpt = *argv; 159 /* 160 * Statfs does not take a `wait' flag, so we cannot 161 * implement nflag here. 162 */ 163 if (statfs(mntpt, &statfsbuf) < 0) { 164 warn("%s", mntpt); 165 continue; 166 } 167 if (argc == 1) 168 maxwidth = strlen(statfsbuf.f_mntfromname) + 1; 169 prtstat(&statfsbuf, maxwidth); 170 } 171 return (0); 172 } 173 174 char * 175 getmntpt(name) 176 char *name; 177 { 178 long i; 179 180 for (i = 0; i < mntsize; i++) { 181 if (!strcmp(mntbuf[i].f_mntfromname, name)) 182 return (mntbuf[i].f_mntonname); 183 } 184 return (0); 185 } 186 187 /* 188 * Convert statfs returned filesystem size into BLOCKSIZE units. 189 * Attempts to avoid overflow for large filesystems. 190 */ 191 #define fsbtoblk(num, fsbs, bs) \ 192 (((fsbs) != 0 && (fsbs) < (bs)) ? \ 193 (num) / ((bs) / (fsbs)) : (num) * ((fsbs) / (bs))) 194 195 /* 196 * Print out status about a filesystem. 197 */ 198 void 199 prtstat(sfsp, maxwidth) 200 struct statfs *sfsp; 201 int maxwidth; 202 { 203 static int headerlen, timesthrough; 204 static char *header; 205 long used, availblks, inodes; 206 207 if (maxwidth < 11) 208 maxwidth = 11; 209 if (++timesthrough == 1) { 210 if (kflag) { 211 header = "1K-blocks"; 212 headerlen = strlen(header); 213 } else 214 header = getbsize(&headerlen, &blocksize); 215 (void)printf("%-*.*s %s Used Avail Capacity", 216 maxwidth, maxwidth, "Filesystem", header); 217 if (iflag) 218 (void)printf(" iused ifree %%iused"); 219 (void)printf(" Mounted on\n"); 220 } 221 (void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname); 222 used = sfsp->f_blocks - sfsp->f_bfree; 223 availblks = sfsp->f_bavail + used; 224 (void)printf(" %*ld %8ld %8ld", headerlen, 225 fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize), 226 fsbtoblk(used, sfsp->f_bsize, blocksize), 227 fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize)); 228 (void)printf(" %5.0f%%", 229 availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0); 230 if (iflag) { 231 inodes = sfsp->f_files; 232 used = inodes - sfsp->f_ffree; 233 (void)printf(" %7ld %7ld %5.0f%% ", used, sfsp->f_ffree, 234 inodes == 0 ? 100.0 : (double)used / (double)inodes * 100.0); 235 } else 236 (void)printf(" "); 237 (void)printf(" %s\n", sfsp->f_mntonname); 238 } 239 240 /* 241 * This code constitutes the pre-system call Berkeley df code for extracting 242 * information from filesystem superblocks. 243 */ 244 #include <ufs/ffs/fs.h> 245 #include <errno.h> 246 #include <fstab.h> 247 248 union { 249 struct fs iu_fs; 250 char dummy[SBSIZE]; 251 } sb; 252 #define sblock sb.iu_fs 253 254 int rfd; 255 256 void 257 ufs_df(file, maxwidth) 258 char *file; 259 int maxwidth; 260 { 261 struct statfs statfsbuf; 262 struct statfs *sfsp; 263 char *mntpt; 264 static int synced; 265 266 if (synced++ == 0) 267 sync(); 268 269 if ((rfd = open(file, O_RDONLY)) < 0) { 270 warn("%s", file); 271 return; 272 } 273 if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) { 274 (void)close(rfd); 275 return; 276 } 277 sfsp = &statfsbuf; 278 sfsp->f_type = 0; 279 sfsp->f_flags = 0; 280 sfsp->f_bsize = sblock.fs_fsize; 281 sfsp->f_iosize = sblock.fs_bsize; 282 sfsp->f_blocks = sblock.fs_dsize; 283 sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag + 284 sblock.fs_cstotal.cs_nffree; 285 sfsp->f_bavail = (sblock.fs_dsize * (100 - sblock.fs_minfree) / 100) - 286 (sblock.fs_dsize - sfsp->f_bfree); 287 if (sfsp->f_bavail < 0) 288 sfsp->f_bavail = 0; 289 sfsp->f_files = sblock.fs_ncg * sblock.fs_ipg; 290 sfsp->f_ffree = sblock.fs_cstotal.cs_nifree; 291 sfsp->f_fsid.val[0] = 0; 292 sfsp->f_fsid.val[1] = 0; 293 if ((mntpt = getmntpt(file)) == 0) 294 mntpt = ""; 295 memmove(&sfsp->f_mntonname[0], mntpt, MNAMELEN); 296 memmove(&sfsp->f_mntfromname[0], file, MNAMELEN); 297 strncpy(sfsp->f_fstypename, MOUNT_UFS, MFSNAMELEN); 298 sfsp->f_fstypename[MFSNAMELEN] = '\0'; 299 prtstat(sfsp, maxwidth); 300 (void)close(rfd); 301 } 302 303 int 304 bread(off, buf, cnt) 305 off_t off; 306 void *buf; 307 int cnt; 308 { 309 int nr; 310 311 (void)lseek(rfd, off, SEEK_SET); 312 if ((nr = read(rfd, buf, cnt)) != cnt) { 313 /* Probably a dismounted disk if errno == EIO. */ 314 if (errno != EIO) 315 (void)fprintf(stderr, "\ndf: %qd: %s\n", 316 off, strerror(nr > 0 ? EIO : errno)); 317 return (0); 318 } 319 return (1); 320 } 321 322 void 323 usage() 324 { 325 (void)fprintf(stderr, "usage: df [-ikln] [file | file_system ...]\n"); 326 exit(1); 327 } 328
Indexes created Wed Oct 01 18:09:54 GMT 2025