preen.c revision 41474 
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	8.5 (Berkeley) 4/28/95";
36#endif /* not lint */
37
38#include <sys/param.h>
39#include <sys/stat.h>
40#include <sys/wait.h>
41
42#include <ufs/ufs/dinode.h>
43
44#include <ctype.h>
45#include <errno.h>
46#include <fstab.h>
47#include <string.h>
48
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
65int	nrun, ndisks;
66char	hotroot;
67
68static void addpart __P((char *name, char *fsname, long auxdata));
69static struct disk *finddisk __P((char *name));
70static char *rawname __P((char *name));
71static int startdisk __P((struct disk *dk,
72		int (*checkit)(char *, char *, long, int)));
73static char *unrawname __P((char *name));
74
75int
76checkfstab(preen, maxrun, docheck, chkit)
77	int preen;
78	int maxrun;
79	int (*docheck)(struct fstab *);
80	int (*chkit)(char *, char *, long, int);
81{
82	register struct fstab *fsp;
83	register struct disk *dk, *nextdisk;
84	register struct part *pt;
85	int ret, pid, retcode, passno, sumstatus, status;
86	long auxdata;
87	char *name;
88
89	sumstatus = 0;
90	for (passno = 1; passno <= 2; passno++) {
91		if (setfsent() == 0) {
92			fprintf(stderr, "Can't open checklist file: %s\n",
93			    _PATH_FSTAB);
94			return (8);
95		}
96		while ((fsp = getfsent()) != 0) {
97			if ((auxdata = (*docheck)(fsp)) == 0)
98				continue;
99			if (preen == 0 ||
100			    (passno == 1 && fsp->fs_passno == 1)) {
101				if ((name = blockcheck(fsp->fs_spec)) != 0) {
102					if ((sumstatus = (*chkit)(name,
103					    fsp->fs_file, auxdata, 0)) != 0)
104						return (sumstatus);
105				} else if (preen)
106					return (8);
107			} else if (passno == 2 && fsp->fs_passno > 1) {
108				if ((name = blockcheck(fsp->fs_spec)) == NULL) {
109					fprintf(stderr, "BAD DISK NAME %s\n",
110						fsp->fs_spec);
111					sumstatus |= 8;
112					continue;
113				}
114				addpart(name, fsp->fs_file, auxdata);
115			}
116		}
117		if (preen == 0)
118			return (0);
119	}
120	if (preen) {
121		if (maxrun == 0)
122			maxrun = ndisks;
123		if (maxrun > ndisks)
124			maxrun = ndisks;
125		nextdisk = disks;
126		for (passno = 0; passno < maxrun; ++passno) {
127			while ((ret = startdisk(nextdisk, chkit)) && nrun > 0)
128				sleep(10);
129			if (ret)
130				return (ret);
131			nextdisk = nextdisk->next;
132		}
133		while ((pid = wait(&status)) != -1) {
134			for (dk = disks; dk; dk = dk->next)
135				if (dk->pid == pid)
136					break;
137			if (dk == 0) {
138				printf("Unknown pid %d\n", pid);
139				continue;
140			}
141			if (WIFEXITED(status))
142				retcode = WEXITSTATUS(status);
143			else
144				retcode = 0;
145			if (WIFSIGNALED(status)) {
146				printf("%s (%s): EXITED WITH SIGNAL %d\n",
147					dk->part->name, dk->part->fsname,
148					WTERMSIG(status));
149				retcode = 8;
150			}
151			if (retcode != 0) {
152				sumstatus |= retcode;
153				*badnext = dk->part;
154				badnext = &dk->part->next;
155				dk->part = dk->part->next;
156				*badnext = NULL;
157			} else
158				dk->part = dk->part->next;
159			dk->pid = 0;
160			nrun--;
161			if (dk->part == NULL)
162				ndisks--;
163
164			if (nextdisk == NULL) {
165				if (dk->part) {
166					while ((ret = startdisk(dk, chkit)) &&
167					    nrun > 0)
168						sleep(10);
169					if (ret)
170						return (ret);
171				}
172			} else if (nrun < maxrun && nrun < ndisks) {
173				for ( ;; ) {
174					if ((nextdisk = nextdisk->next) == NULL)
175						nextdisk = disks;
176					if (nextdisk->part != NULL &&
177					    nextdisk->pid == 0)
178						break;
179				}
180				while ((ret = startdisk(nextdisk, chkit)) &&
181				    nrun > 0)
182					sleep(10);
183				if (ret)
184					return (ret);
185			}
186		}
187	}
188	if (sumstatus) {
189		if (badlist == 0)
190			return (sumstatus);
191		fprintf(stderr, "THE FOLLOWING FILE SYSTEM%s HAD AN %s\n\t",
192			badlist->next ? "S" : "", "UNEXPECTED INCONSISTENCY:");
193		for (pt = badlist; pt; pt = pt->next)
194			fprintf(stderr, "%s (%s)%s", pt->name, pt->fsname,
195			    pt->next ? ", " : "\n");
196		return (sumstatus);
197	}
198	(void)endfsent();
199	return (0);
200}
201
202static struct disk *
203finddisk(name)
204	char *name;
205{
206	register struct disk *dk, **dkp;
207	register char *p;
208	size_t len;
209
210	p = strrchr(name, '/');
211	p = p == NULL ? name : p + 1;
212	while (*p != '\0' && !isdigit((u_char)*p))
213		p++;
214	while (isdigit((u_char)*p))
215		p++;
216	len = (size_t)(p - name);
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
240static void
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
272static int
273startdisk(dk, checkit)
274	register struct disk *dk;
275	int (*checkit)(char *, char *, long, int);
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(origname)
292	char *origname;
293{
294	struct stat stslash, stblock, stchar;
295	char *newname, *raw;
296	struct fstab *fsinfo;
297	int retried = 0, len;
298
299	hotroot = 0;
300	if (stat("/", &stslash) < 0) {
301		printf("Can't stat /: %s\n", strerror(errno));
302		return (origname);
303	}
304	newname = origname;
305retry:
306	if (stat(newname, &stblock) < 0) {
307		printf("Can't stat %s: %s\n", newname, strerror(errno));
308		return (origname);
309	}
310	if ((stblock.st_mode & S_IFMT) == S_IFBLK) {
311		if (stslash.st_dev == stblock.st_rdev)
312			hotroot++;
313		raw = rawname(newname);
314		if (stat(raw, &stchar) < 0) {
315			printf("Can't stat %s: %s\n", raw, strerror(errno));
316			return (origname);
317		}
318		if ((stchar.st_mode & S_IFMT) == S_IFCHR) {
319			return (raw);
320		} else {
321			printf("%s is not a character device\n", raw);
322			return (origname);
323		}
324	} else if ((stblock.st_mode & S_IFMT) == S_IFCHR && !retried) {
325		newname = unrawname(newname);
326		retried++;
327		goto retry;
328	} else if ((stblock.st_mode & S_IFMT) == S_IFDIR && !retried) {
329		len = strlen(origname) - 1;
330		if (len > 0 && origname[len] == '/')
331			/* remove trailing slash */
332			origname[len] = '\0';
333		if ((fsinfo = getfsfile(origname)) == NULL) {
334			printf("Can't resolve %s to character special device",
335			    origname);
336			return (0);
337		}
338		newname = fsinfo->fs_spec;
339		retried++;
340		goto retry;
341	}
342	/*
343	 * Not a block or character device, just return name and
344	 * let the user decide whether to use it.
345	 */
346	return (origname);
347}
348
349static char *
350unrawname(name)
351	char *name;
352{
353	char *dp;
354	struct stat stb;
355
356	if ((dp = strrchr(name, '/')) == 0)
357		return (name);
358	if (stat(name, &stb) < 0)
359		return (name);
360	if ((stb.st_mode & S_IFMT) != S_IFCHR)
361		return (name);
362	if (dp[1] != 'r')
363		return (name);
364	(void)strcpy(&dp[1], &dp[2]);
365	return (name);
366}
367
368static char *
369rawname(name)
370	char *name;
371{
372	static char rawbuf[32];
373	char *dp;
374
375	if ((dp = strrchr(name, '/')) == 0)
376		return (0);
377	*dp = 0;
378	(void)strcpy(rawbuf, name);
379	*dp = '/';
380	(void)strcat(rawbuf, "/r");
381	(void)strcat(rawbuf, &dp[1]);
382	return (rawbuf);
383}
384