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1.1 root 1: /*
2: * Copyright (c) 1980 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: #ifndef lint
8: char copyright[] =
9: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
10: All rights reserved.\n";
11: #endif /* not lint */
12:
13: #ifndef lint
14: static char sccsid[] = "@(#)df.c 5.3 (Berkeley) 1/10/88";
15: #endif /* not lint */
16:
17: #include <sys/param.h>
18: #include <sys/fs.h>
19: #include <sys/stat.h>
20: #include <errno.h>
21:
22: #include <stdio.h>
23: #include <fstab.h>
24: #include <mtab.h>
25:
26: /*
27: * df
28: */
29: struct mtab mtab[NMOUNT];
30: char root[32];
31: char *mpath();
32:
33: int iflag;
34:
35: union {
36: struct fs iu_fs;
37: char dummy[SBSIZE];
38: } sb;
39: #define sblock sb.iu_fs
40:
41: int fi;
42: daddr_t alloc();
43: char *strcpy();
44:
45: main(argc, argv)
46: int argc;
47: char **argv;
48: {
49: int i;
50:
51: while (argc > 1 && argv[1][0]=='-') {
52: switch (argv[1][1]) {
53:
54: case 'i':
55: iflag++;
56: break;
57:
58: default:
59: fprintf(stderr, "usage: df [ -i ] [ filsys... ]\n");
60: exit(0);
61: }
62: argc--, argv++;
63: }
64: i = open("/etc/mtab", 0);
65: if (i >= 0) {
66: (void) read(i, (char *)mtab, sizeof (mtab));
67: (void) close(i);
68: }
69: sync();
70: printf("Filesystem kbytes used avail capacity");
71: if (iflag)
72: printf(" iused ifree %%iused");
73: printf(" Mounted on\n");
74: if (argc <= 1) {
75: struct fstab *fsp;
76:
77: if (setfsent() == 0)
78: perror(FSTAB), exit(1);
79: while (fsp = getfsent()) {
80: if (strcmp(fsp->fs_type, FSTAB_RW) &&
81: strcmp(fsp->fs_type, FSTAB_RO) &&
82: strcmp(fsp->fs_type, FSTAB_RQ))
83: continue;
84: if (root[0] == 0)
85: (void) strcpy(root, fsp->fs_spec);
86: dfree(fsp->fs_spec, 1);
87: }
88: (void)endfsent();
89: exit(0);
90: }
91: for (i=1; i<argc; i++)
92: dfree(argv[i], 0);
93: }
94:
95: dfree(file, infsent)
96: char *file;
97: int infsent;
98: {
99: long totalblks, availblks, avail, free, used;
100: struct stat stbuf;
101: struct fstab *fsp;
102:
103: if (stat(file, &stbuf) == 0 &&
104: (stbuf.st_mode&S_IFMT) != S_IFCHR &&
105: (stbuf.st_mode&S_IFMT) != S_IFBLK) {
106: if (infsent) {
107: fprintf(stderr, "%s: screwy /etc/fstab entry\n", file);
108: return;
109: }
110: (void)setfsent();
111: while (fsp = getfsent()) {
112: struct stat stb;
113:
114: if (stat(fsp->fs_spec, &stb) == 0 &&
115: stb.st_rdev == stbuf.st_dev) {
116: file = fsp->fs_spec;
117: (void)endfsent();
118: goto found;
119: }
120: }
121: (void)endfsent();
122: fprintf(stderr, "%s: mounted on unknown device\n", file);
123: return;
124: }
125: found:
126: fi = open(file, 0);
127: if (fi < 0) {
128: perror(file);
129: return;
130: }
131: if (bread((long)SBOFF, (char *)&sblock, SBSIZE) == 0) {
132: (void) close(fi);
133: return;
134: }
135: printf("%-12.12s", file);
136: totalblks = sblock.fs_dsize;
137: free = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
138: sblock.fs_cstotal.cs_nffree;
139: used = totalblks - free;
140: availblks = totalblks * (100 - sblock.fs_minfree) / 100;
141: avail = availblks > used ? availblks - used : 0;
142: printf("%8d%8d%8d", totalblks * sblock.fs_fsize / 1024,
143: used * sblock.fs_fsize / 1024, avail * sblock.fs_fsize / 1024);
144: printf("%6.0f%%",
145: availblks == 0 ? 0.0 : (double) used / (double) availblks * 100.0);
146: if (iflag) {
147: int inodes = sblock.fs_ncg * sblock.fs_ipg;
148: used = inodes - sblock.fs_cstotal.cs_nifree;
149: printf("%8ld%8ld%6.0f%% ", used, sblock.fs_cstotal.cs_nifree,
150: inodes == 0 ? 0.0 : (double)used / (double)inodes * 100.0);
151: } else
152: printf(" ");
153: printf(" %s\n", mpath(file));
154: (void) close(fi);
155: }
156:
157: long lseek();
158:
159: bread(off, buf, cnt)
160: long off;
161: char *buf;
162: {
163: int n;
164: extern errno;
165:
166: (void) lseek(fi, off, 0);
167: if ((n=read(fi, buf, cnt)) != cnt) {
168: /* probably a dismounted disk if errno == EIO */
169: if (errno != EIO) {
170: printf("\nread error off = %ld\n", off);
171: printf("count = %d; errno = %d\n", n, errno);
172: }
173: return (0);
174: }
175: return (1);
176: }
177:
178: /*
179: * Given a name like /dev/rrp0h, returns the mounted path, like /usr.
180: */
181: char *
182: mpath(file)
183: char *file;
184: {
185: register struct mtab *mp;
186:
187: if (eq(file, root))
188: return ("/");
189: for (mp = mtab; mp < mtab + NMOUNT; mp++)
190: if (eq(file, mp->m_dname))
191: return (mp->m_path);
192: return "";
193: }
194:
195: eq(f1, f2)
196: char *f1, *f2;
197: {
198:
199: if (strncmp(f1, "/dev/", 5) == 0)
200: f1 += 5;
201: if (strncmp(f2, "/dev/", 5) == 0)
202: f2 += 5;
203: if (!strcmp(f1, f2))
204: return (1);
205: if (*f1 == 'r' && !strcmp(f1+1, f2))
206: return (1);
207: if (*f2 == 'r' && !strcmp(f1, f2+1))
208: return (1);
209: if (*f1 == 'r' && *f2 == 'r' && strcmp(f1+1, f2+1) == 0)
210: return (1);
211: return (0);
212: }
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