df.c revision 1.12
1 /* 2 * Copyright (c) 1980, 1990 The Regents of the University of California. 3 * 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 char copyright[] = 41 "@(#) Copyright (c) 1980, 1990 The Regents of the University of California.\n\ 42 All rights reserved.\n"; 43 #endif /* not lint */ 44 45 #ifndef lint 46 /*static char sccsid[] = "from: @(#)df.c 5.30 (Berkeley) 4/23/92";*/ 47 static char rcsid[] = "$Id: df.c,v 1.12 1994/05/17 04:06:00 cgd Exp $"; 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/mount.h> 53 #include <errno.h> 54 #include <err.h> 55 #include <fcntl.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 60 #include <unistd.h> 61 62 int bread __P((long, char *, int)); 63 char *getmntpt __P((char *)); 64 void prtstat __P((struct statfs *, long)); 65 void ufs_df __P((char *, long)); 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 informaation 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 if (!*argv) { 119 for (i = 0; i < mntsize; i++) 120 if (!lflag || mntbuf[i].f_flags & MNT_LOCAL) 121 prtstat(&mntbuf[i], maxwidth); 122 exit(0); 123 } 124 for (; *argv; argv++) { 125 if (stat(*argv, &stbuf) < 0) { 126 if ((mntpt = getmntpt(*argv)) == 0) { 127 warn("%s", *argv); 128 continue; 129 } 130 } else if ((stbuf.st_mode & S_IFMT) == S_IFCHR) { 131 ufs_df(*argv, maxwidth); 132 continue; 133 } else if ((stbuf.st_mode & S_IFMT) == S_IFBLK) { 134 if ((mntpt = getmntpt(*argv)) == 0) { 135 mntpt = mktemp(strdup("/tmp/df.XXXXXX")); 136 mdev.fspec = *argv; 137 if (mkdir(mntpt, DEFFILEMODE) != 0) { 138 warn("%s", mntpt); 139 continue; 140 } 141 if (mount(MOUNT_UFS, mntpt, MNT_RDONLY, 142 &mdev) != 0) { 143 ufs_df(*argv, maxwidth); 144 (void)rmdir(mntpt); 145 continue; 146 } else if (statfs(mntpt, &statfsbuf)) { 147 statfsbuf.f_mntonname[0] = '\0'; 148 prtstat(&statfsbuf, maxwidth); 149 } else 150 warn("%s", *argv); 151 (void)unmount(mntpt, MNT_NOFORCE); 152 (void)rmdir(mntpt); 153 continue; 154 } 155 } else 156 mntpt = *argv; 157 /* 158 * Statfs does not take a `wait' flag, so we cannot 159 * implement nflag here. 160 */ 161 if (statfs(mntpt, &statfsbuf) < 0) { 162 warn("%s", mntpt); 163 continue; 164 } 165 if (argc == 1) 166 maxwidth = strlen(statfsbuf.f_mntfromname) + 1; 167 prtstat(&statfsbuf, maxwidth); 168 } 169 return (0); 170 } 171 172 char * 173 getmntpt(name) 174 char *name; 175 { 176 long i; 177 178 for (i = 0; i < mntsize; i++) { 179 if (!strcmp(mntbuf[i].f_mntfromname, name)) 180 return (mntbuf[i].f_mntonname); 181 } 182 return (0); 183 } 184 185 /* 186 * Print out status about a filesystem. 187 */ 188 void 189 prtstat(sfsp, maxwidth) 190 register struct statfs *sfsp; 191 long maxwidth; 192 { 193 static int headerlen, timesthrough; 194 static char *header; 195 long used, availblks, inodes; 196 197 if (maxwidth < 11) 198 maxwidth = 11; 199 if (++timesthrough == 1) { 200 if (kflag) { 201 header = "1K-blocks"; 202 headerlen = strlen(header); 203 } else 204 header = getbsize(&headerlen, &blocksize); 205 (void)printf("%-*.*s %s Used Avail Capacity", 206 maxwidth, maxwidth, "Filesystem", header); 207 if (iflag) 208 (void)printf(" iused ifree %%iused"); 209 (void)printf(" Mounted on\n"); 210 } 211 (void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname); 212 used = sfsp->f_blocks - sfsp->f_bfree; 213 availblks = sfsp->f_bavail + used; 214 (void)printf(" %*ld %7ld %7ld", headerlen, 215 sfsp->f_blocks * sfsp->f_bsize / blocksize, 216 used * sfsp->f_bsize / blocksize, 217 sfsp->f_bavail * sfsp->f_bsize / blocksize); 218 (void)printf(" %5.0f%%", 219 availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0); 220 if (iflag) { 221 inodes = sfsp->f_files; 222 used = inodes - sfsp->f_ffree; 223 (void)printf(" %7ld %7ld %5.0f%% ", used, sfsp->f_ffree, 224 inodes == 0 ? 100.0 : (double)used / (double)inodes * 100.0); 225 } else 226 (void)printf(" "); 227 (void)printf(" %s\n", sfsp->f_mntonname); 228 } 229 230 /* 231 * This code constitutes the old df code for extracting 232 * information from filesystem superblocks. 233 */ 234 #include <ufs/fs.h> 235 #include <errno.h> 236 #include <fstab.h> 237 238 union { 239 struct fs iu_fs; 240 char dummy[SBSIZE]; 241 } sb; 242 #define sblock sb.iu_fs 243 244 int fi; 245 246 void 247 ufs_df(file, maxwidth) 248 char *file; 249 long maxwidth; 250 { 251 struct statfs statfsbuf; 252 register struct statfs *sfsp; 253 char *mntpt; 254 static int synced; 255 256 if (synced++ == 0) 257 sync(); 258 259 if ((fi = open(file, O_RDONLY)) < 0) { 260 warn("%s", file); 261 return; 262 } 263 if (bread((long)SBOFF, (char *)&sblock, SBSIZE) == 0) { 264 (void)close(fi); 265 return; 266 } 267 sfsp = &statfsbuf; 268 sfsp->f_type = 0; 269 sfsp->f_flags = 0; 270 sfsp->f_iosize = sblock.fs_fsize; 271 #ifdef notyet 272 sfsp->f_iosize = sblock.fs_bsize; 273 #endif 274 sfsp->f_blocks = sblock.fs_dsize; 275 sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag + 276 sblock.fs_cstotal.cs_nffree; 277 sfsp->f_bavail = (sblock.fs_dsize * (100 - sblock.fs_minfree) / 100) - 278 (sblock.fs_dsize - sfsp->f_bfree); 279 if (sfsp->f_bavail < 0) 280 sfsp->f_bavail = 0; 281 sfsp->f_files = sblock.fs_ncg * sblock.fs_ipg; 282 sfsp->f_ffree = sblock.fs_cstotal.cs_nifree; 283 sfsp->f_fsid.val[0] = 0; 284 sfsp->f_fsid.val[1] = 0; 285 if ((mntpt = getmntpt(file)) == 0) 286 mntpt = ""; 287 bcopy((caddr_t)mntpt, (caddr_t)&sfsp->f_mntonname[0], MNAMELEN); 288 bcopy((caddr_t)file, (caddr_t)&sfsp->f_mntfromname[0], MNAMELEN); 289 strncpy(sfsp->f_fstypename, MOUNT_UFS, MFSNAMELEN); 290 sfsp->f_fstypename[MFSNAMELEN] = '\0'; 291 prtstat(sfsp, maxwidth); 292 (void) close(fi); 293 } 294 295 int 296 bread(off, buf, cnt) 297 long off; 298 char *buf; 299 int cnt; 300 { 301 int n; 302 303 (void) lseek(fi, off, SEEK_SET); 304 if ((n=read(fi, buf, cnt)) != cnt) { 305 /* probably a dismounted disk if errno == EIO */ 306 if (errno != EIO) { 307 (void)printf("\nread error off = %ld\n", off); 308 (void)printf("count = %d: %s\n", n, strerror(errno)); 309 } 310 return (0); 311 } 312 return (1); 313 } 314 315 void 316 usage() 317 { 318 319 fprintf(stderr, "usage: df [-ikln] [file | file_system ...]\n"); 320 exit(1); 321 } 322
Indexes created Wed Oct 01 18:09:54 GMT 2025