preen.c revision 19185 
1/*
2 * Copyright (c) 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char sccsid[] = "@(#)preen.c	8.1 (Berkeley) 6/5/93";
36#endif /* not lint */
37
38#include <sys/param.h>
39#include <sys/stat.h>
40#include <sys/wait.h>
41#include <ufs/ufs/dinode.h>
42#include <fstab.h>
43#include <string.h>
44#include <stdio.h>
45#include <unistd.h>
46#include <stdlib.h>
47#include <ctype.h>
48#include <fstab.h>
49#include "fsck.h"
50
51struct part {
52	struct	part *next;		/* forward link of partitions on disk */
53	char	*name;			/* device name */
54	char	*fsname;		/* mounted filesystem name */
55	long	auxdata;		/* auxillary data for application */
56} *badlist, **badnext = &badlist;
57
58struct disk {
59	char	*name;			/* disk base name */
60	struct	disk *next;		/* forward link for list of disks */
61	struct	part *part;		/* head of list of partitions on disk */
62	int	pid;			/* If != 0, pid of proc working on */
63} *disks;
64
65static void	addpart __P((char *name, char *fsname, long auxdata));
66static int	startdisk __P((struct disk *dk, int (*checkit)()));
67static struct disk 	*finddisk __P((char *name));
68static char 	*unrawname __P((char *name));
69static char 	*rawname __P((char *name));
70
71int	nrun, ndisks;
72char	hotroot;
73
74int
75checkfstab(preen, maxrun, docheck, chkit)
76	int preen, maxrun;
77	int (*docheck)(), (*chkit)();
78{
79	register struct fstab *fsp;
80	register struct disk *dk, *nextdisk;
81	register struct part *pt;
82	int ret, pid, retcode, passno, sumstatus, status;
83	long auxdata;
84	char *name;
85
86	sumstatus = 0;
87	for (passno = 1; passno <= 2; passno++) {
88		if (setfsent() == 0) {
89			fprintf(stderr, "Can't open checklist file: %s\n",
90			    _PATH_FSTAB);
91			return (8);
92		}
93		while ((fsp = getfsent()) != 0) {
94			if ((auxdata = (*docheck)(fsp)) == 0)
95				continue;
96			if (!preen || (passno == 1 && fsp->fs_passno == 1)) {
97				name = blockcheck(fsp->fs_spec);
98				if (name) {
99					sumstatus = (*chkit)(name,
100					    fsp->fs_file, auxdata, 0);
101					if (sumstatus)
102						return (sumstatus);
103				} else if (preen)
104					return (8);
105			} else if (passno == 2 && fsp->fs_passno > 1) {
106				if ((name = blockcheck(fsp->fs_spec)) == NULL) {
107					fprintf(stderr, "BAD DISK NAME %s\n",
108						fsp->fs_spec);
109					sumstatus |= 8;
110					continue;
111				}
112				addpart(name, fsp->fs_file, auxdata);
113			}
114		}
115		if (preen == 0)
116			return (0);
117	}
118	if (preen) {
119		if (maxrun == 0)
120			maxrun = ndisks;
121		if (maxrun > ndisks)
122			maxrun = ndisks;
123		nextdisk = disks;
124		for (passno = 0; passno < maxrun; ++passno) {
125			while ((ret = startdisk(nextdisk, chkit)) != 0 &&
126			    nrun > 0)
127				sleep(10);
128			if (ret)
129				return (ret);
130			nextdisk = nextdisk->next;
131		}
132		while ((pid = wait(&status)) != -1) {
133			for (dk = disks; dk; dk = dk->next)
134				if (dk->pid == pid)
135					break;
136			if (dk == 0) {
137				printf("Unknown pid %d\n", pid);
138				continue;
139			}
140			if (WIFEXITED(status))
141				retcode = WEXITSTATUS(status);
142			else
143				retcode = 0;
144			if (WIFSIGNALED(status)) {
145				printf("%s (%s): EXITED WITH SIGNAL %d\n",
146					dk->part->name, dk->part->fsname,
147					WTERMSIG(status));
148				retcode = 8;
149			}
150			if (retcode != 0) {
151				sumstatus |= retcode;
152				*badnext = dk->part;
153				badnext = &dk->part->next;
154				dk->part = dk->part->next;
155				*badnext = NULL;
156			} else
157				dk->part = dk->part->next;
158			dk->pid = 0;
159			nrun--;
160			if (dk->part == NULL)
161				ndisks--;
162
163			if (nextdisk == NULL) {
164				if (dk->part) {
165					while ((ret = startdisk(dk, chkit)) != 0
166					    && nrun > 0)
167						sleep(10);
168					if (ret)
169						return (ret);
170				}
171			} else if (nrun < maxrun && nrun < ndisks) {
172				for ( ;; ) {
173					if ((nextdisk = nextdisk->next) == NULL)
174						nextdisk = disks;
175					if (nextdisk->part != NULL &&
176					    nextdisk->pid == 0)
177						break;
178				}
179				while ((ret = startdisk(nextdisk, chkit)) != 0
180				    && nrun > 0)
181					sleep(10);
182				if (ret)
183					return (ret);
184			}
185		}
186	}
187	if (sumstatus) {
188		if (badlist == 0)
189			return (sumstatus);
190		fprintf(stderr, "THE FOLLOWING FILE SYSTEM%s HAD AN %s\n\t",
191			badlist->next ? "S" : "", "UNEXPECTED INCONSISTENCY:");
192		for (pt = badlist; pt; pt = pt->next)
193			fprintf(stderr, "%s (%s)%s", pt->name, pt->fsname,
194			    pt->next ? ", " : "\n");
195		return (sumstatus);
196	}
197	(void)endfsent();
198	return (0);
199}
200
201struct disk *
202finddisk(name)
203	char *name;
204{
205	register struct disk *dk, **dkp;
206	register char *p;
207	size_t len = 0;
208
209	for (p = name + strlen(name) - 1; p >= name; --p)
210		if (isdigit(*p)) {
211			len = p - name + 1;
212			break;
213		}
214	if (p < name)
215		len = strlen(name);
216
217	for (dk = disks, dkp = &disks; dk; dkp = &dk->next, dk = dk->next) {
218		if (strncmp(dk->name, name, len) == 0 &&
219		    dk->name[len] == 0)
220			return (dk);
221	}
222	if ((*dkp = (struct disk *)malloc(sizeof(struct disk))) == NULL) {
223		fprintf(stderr, "out of memory");
224		exit (8);
225	}
226	dk = *dkp;
227	if ((dk->name = malloc(len + 1)) == NULL) {
228		fprintf(stderr, "out of memory");
229		exit (8);
230	}
231	(void)strncpy(dk->name, name, len);
232	dk->name[len] = '\0';
233	dk->part = NULL;
234	dk->next = NULL;
235	dk->pid = 0;
236	ndisks++;
237	return (dk);
238}
239
240void
241addpart(name, fsname, auxdata)
242	char *name, *fsname;
243	long auxdata;
244{
245	struct disk *dk = finddisk(name);
246	register struct part *pt, **ppt = &dk->part;
247
248	for (pt = dk->part; pt; ppt = &pt->next, pt = pt->next)
249		if (strcmp(pt->name, name) == 0) {
250			printf("%s in fstab more than once!\n", name);
251			return;
252		}
253	if ((*ppt = (struct part *)malloc(sizeof(struct part))) == NULL) {
254		fprintf(stderr, "out of memory");
255		exit (8);
256	}
257	pt = *ppt;
258	if ((pt->name = malloc(strlen(name) + 1)) == NULL) {
259		fprintf(stderr, "out of memory");
260		exit (8);
261	}
262	(void)strcpy(pt->name, name);
263	if ((pt->fsname = malloc(strlen(fsname) + 1)) == NULL) {
264		fprintf(stderr, "out of memory");
265		exit (8);
266	}
267	(void)strcpy(pt->fsname, fsname);
268	pt->next = NULL;
269	pt->auxdata = auxdata;
270}
271
272int
273startdisk(dk, checkit)
274	register struct disk *dk;
275	int (*checkit)();
276{
277	register struct part *pt = dk->part;
278
279	dk->pid = fork();
280	if (dk->pid < 0) {
281		perror("fork");
282		return (8);
283	}
284	if (dk->pid == 0)
285		exit((*checkit)(pt->name, pt->fsname, pt->auxdata, 1));
286	nrun++;
287	return (0);
288}
289
290char *
291blockcheck(name)
292	char *name;
293{
294	struct stat stslash, stblock, stchar;
295	char *raw;
296	struct fstab *fsinfo;
297	int retried = 0, l;
298
299	hotroot = 0;
300	if (stat("/", &stslash) < 0) {
301		perror("/");
302		printf("Can't stat root\n");
303		return (0);
304	}
305retry:
306	if (stat(name, &stblock) < 0) {
307		perror(name);
308		printf("Can't stat %s\n", name);
309		return (0);
310	}
311	if ((stblock.st_mode & S_IFMT) == S_IFBLK) {
312		if (stslash.st_dev == stblock.st_rdev)
313			hotroot++;
314		raw = rawname(name);
315		if (stat(raw, &stchar) < 0) {
316			perror(raw);
317			printf("Can't stat %s\n", raw);
318			return (name);
319		}
320		if ((stchar.st_mode & S_IFMT) == S_IFCHR) {
321			return (raw);
322		} else {
323			printf("%s is not a character device\n", raw);
324			return (name);
325		}
326	} else if ((stblock.st_mode & S_IFMT) == S_IFCHR && !retried) {
327		name = unrawname(name);
328		retried++;
329		goto retry;
330	} else if ((stblock.st_mode & S_IFMT) == S_IFDIR && !retried) {
331		l = strlen(name) - 1;
332		if (l > 0 && name[l] == '/')
333			/* remove trailing slash */
334			name[l] = '\0';
335		if(!(fsinfo=getfsfile(name))) {
336			printf("Can't resolve %s to character special device",
337			    name);
338			return (0);
339		}
340		name = fsinfo->fs_spec;
341		retried++;
342		goto retry;
343	}
344	printf("Can't make sense out of name %s\n", name);
345	return (0);
346}
347
348char *
349unrawname(name)
350	char *name;
351{
352	char *dp;
353	struct stat stb;
354
355	if ((dp = rindex(name, '/')) == 0)
356		return (name);
357	if (stat(name, &stb) < 0)
358		return (name);
359	if ((stb.st_mode & S_IFMT) != S_IFCHR)
360		return (name);
361	if (dp[1] != 'r')
362		return (name);
363	(void)strcpy(&dp[1], &dp[2]);
364	return (name);
365}
366
367char *
368rawname(name)
369	char *name;
370{
371	static char rawbuf[32];
372	char *dp;
373
374	if ((dp = rindex(name, '/')) == 0)
375		return (0);
376	*dp = 0;
377	(void)strcpy(rawbuf, name);
378	*dp = '/';
379	(void)strcat(rawbuf, "/r");
380	(void)strcat(rawbuf, &dp[1]);
381	return (rawbuf);
382}
383