xref: /csrg-svn/sbin/fsck/dir.c (revision 17930)
1 #ifndef lint
2 static char version[] = "@(#)dir.c	3.2 (Berkeley) 02/07/85";
3 #endif
4 
5 #include <sys/param.h>
6 #include <sys/inode.h>
7 #include <sys/fs.h>
8 #define KERNEL
9 #include <sys/dir.h>
10 #undef KERNEL
11 #include "fsck.h"
12 
13 #define MINDIRSIZE	(sizeof (struct dirtemplate))
14 
15 char	*endpathname = &pathname[BUFSIZ - 2];
16 char	*lfname = "lost+found";
17 
18 DIRECT	*fsck_readdir();
19 
20 descend(parentino, inumber)
21 	struct inodesc *parentino;
22 	ino_t inumber;
23 {
24 	register DINODE *dp;
25 	struct inodesc curino;
26 
27 	bzero((char *)&curino, sizeof(struct inodesc));
28 	statemap[inumber] = FSTATE;
29 	if ((dp = ginode(inumber)) == NULL)
30 		return;
31 	if (dp->di_size == 0) {
32 		direrr(inumber, "ZERO LENGTH DIRECTORY");
33 		if (reply("REMOVE") == 1)
34 			statemap[inumber] = CLEAR;
35 		return;
36 	}
37 	if (dp->di_size < MINDIRSIZE) {
38 		direrr(inumber, "DIRECTORY TOO SHORT");
39 		dp->di_size = MINDIRSIZE;
40 		if (reply("FIX") == 1)
41 			inodirty();
42 	}
43 	curino.id_type = DATA;
44 	curino.id_func = parentino->id_func;
45 	curino.id_parent = parentino->id_number;
46 	curino.id_number = inumber;
47 	curino.id_filesize = dp->di_size;
48 	(void)ckinode(dp, &curino);
49 }
50 
51 dirscan(idesc)
52 	register struct inodesc *idesc;
53 {
54 	register DIRECT *dp;
55 	int dsize, n;
56 	long blksiz;
57 	char dbuf[DIRBLKSIZ];
58 
59 	if (idesc->id_type != DATA)
60 		errexit("wrong type to dirscan %d\n", idesc->id_type);
61 	blksiz = idesc->id_numfrags * sblock.fs_fsize;
62 	if (outrange(idesc->id_blkno, idesc->id_numfrags)) {
63 		idesc->id_filesize -= blksiz;
64 		return (SKIP);
65 	}
66 	idesc->id_loc = 0;
67 	for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
68 		dsize = dp->d_reclen;
69 		bcopy((char *)dp, dbuf, dsize);
70 		idesc->id_dirp = (DIRECT *)dbuf;
71 		if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
72 			if (getblk(&fileblk, idesc->id_blkno, blksiz) != NULL) {
73 				bcopy(dbuf, (char *)dp, dsize);
74 				dirty(&fileblk);
75 				sbdirty();
76 			} else
77 				n &= ~ALTERED;
78 		}
79 		if (n & STOP)
80 			return (n);
81 	}
82 	return (idesc->id_filesize > 0 ? KEEPON : STOP);
83 }
84 
85 /*
86  * get next entry in a directory.
87  */
88 DIRECT *
89 fsck_readdir(idesc)
90 	register struct inodesc *idesc;
91 {
92 	register DIRECT *dp, *ndp;
93 	long size, blksiz;
94 
95 	blksiz = idesc->id_numfrags * sblock.fs_fsize;
96 	if (getblk(&fileblk, idesc->id_blkno, blksiz) == NULL) {
97 		idesc->id_filesize -= blksiz - idesc->id_loc;
98 		return NULL;
99 	}
100 	if (idesc->id_loc % DIRBLKSIZ == 0 && idesc->id_filesize > 0 &&
101 	    idesc->id_loc < blksiz) {
102 		dp = (DIRECT *)(dirblk.b_buf + idesc->id_loc);
103 		if (dircheck(idesc, dp))
104 			goto dpok;
105 		idesc->id_loc += DIRBLKSIZ;
106 		idesc->id_filesize -= DIRBLKSIZ;
107 		dp->d_reclen = DIRBLKSIZ;
108 		dp->d_ino = 0;
109 		dp->d_namlen = 0;
110 		dp->d_name[0] = '\0';
111 		if (dofix(idesc, "DIRECTORY CORRUPTED"))
112 			dirty(&fileblk);
113 		return (dp);
114 	}
115 dpok:
116 	if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
117 		return NULL;
118 	dp = (DIRECT *)(dirblk.b_buf + idesc->id_loc);
119 	idesc->id_loc += dp->d_reclen;
120 	idesc->id_filesize -= dp->d_reclen;
121 	if ((idesc->id_loc % DIRBLKSIZ) == 0)
122 		return (dp);
123 	ndp = (DIRECT *)(dirblk.b_buf + idesc->id_loc);
124 	if (idesc->id_loc < blksiz && idesc->id_filesize > 0 &&
125 	    dircheck(idesc, ndp) == 0) {
126 		size = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
127 		dp->d_reclen += size;
128 		idesc->id_loc += size;
129 		idesc->id_filesize -= size;
130 		if (dofix(idesc, "DIRECTORY CORRUPTED"))
131 			dirty(&fileblk);
132 	}
133 	return (dp);
134 }
135 
136 /*
137  * Verify that a directory entry is valid.
138  * This is a superset of the checks made in the kernel.
139  */
140 dircheck(idesc, dp)
141 	struct inodesc *idesc;
142 	register DIRECT *dp;
143 {
144 	register int size;
145 	register char *cp;
146 	int spaceleft;
147 
148 	size = DIRSIZ(dp);
149 	spaceleft = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
150 	if (dp->d_ino < imax &&
151 	    dp->d_reclen != 0 &&
152 	    dp->d_reclen <= spaceleft &&
153 	    (dp->d_reclen & 0x3) == 0 &&
154 	    dp->d_reclen >= size &&
155 	    idesc->id_filesize >= size &&
156 	    dp->d_namlen <= MAXNAMLEN) {
157 		if (dp->d_ino == 0)
158 			return (1);
159 		for (cp = dp->d_name, size = 0; size < dp->d_namlen; size++)
160 			if (*cp == 0 || (*cp++ & 0200))
161 				return (0);
162 		if (*cp == 0)
163 			return (1);
164 	}
165 	return (0);
166 }
167 
168 direrr(ino, s)
169 	ino_t ino;
170 	char *s;
171 {
172 	register DINODE *dp;
173 
174 	pwarn("%s ", s);
175 	pinode(ino);
176 	printf("\n");
177 	if ((dp = ginode(ino)) != NULL && ftypeok(dp))
178 		pfatal("%s=%s\n", DIRCT(dp) ? "DIR" : "FILE", pathname);
179 	else
180 		pfatal("NAME=%s\n", pathname);
181 }
182 
183 adjust(idesc, lcnt)
184 	register struct inodesc *idesc;
185 	short lcnt;
186 {
187 	register DINODE *dp;
188 
189 	if ((dp = ginode(idesc->id_number)) == NULL)
190 		return;
191 	if (dp->di_nlink == lcnt) {
192 		if (linkup(idesc->id_number, (ino_t)0) == 0)
193 			clri(idesc, "UNREF", 0);
194 	}
195 	else {
196 		pwarn("LINK COUNT %s", (lfdir == idesc->id_number) ? lfname :
197 			(DIRCT(dp) ? "DIR" : "FILE"));
198 		pinode(idesc->id_number);
199 		printf(" COUNT %d SHOULD BE %d",
200 			dp->di_nlink, dp->di_nlink-lcnt);
201 		if (preen) {
202 			if (lcnt < 0) {
203 				printf("\n");
204 				pfatal("LINK COUNT INCREASING");
205 			}
206 			printf(" (ADJUSTED)\n");
207 		}
208 		if (preen || reply("ADJUST") == 1) {
209 			dp->di_nlink -= lcnt;
210 			inodirty();
211 		}
212 	}
213 }
214 
215 mkentry(idesc)
216 	struct inodesc *idesc;
217 {
218 	register DIRECT *dirp = idesc->id_dirp;
219 	DIRECT newent;
220 	int newlen, oldlen;
221 
222 	newent.d_namlen = 11;
223 	newlen = DIRSIZ(&newent);
224 	if (dirp->d_ino != 0)
225 		oldlen = DIRSIZ(dirp);
226 	else
227 		oldlen = 0;
228 	if (dirp->d_reclen - oldlen < newlen)
229 		return (KEEPON);
230 	newent.d_reclen = dirp->d_reclen - oldlen;
231 	dirp->d_reclen = oldlen;
232 	dirp = (struct direct *)(((char *)dirp) + oldlen);
233 	dirp->d_ino = idesc->id_parent;	/* ino to be entered is in id_parent */
234 	dirp->d_reclen = newent.d_reclen;
235 	dirp->d_namlen = lftempname(dirp->d_name, idesc->id_parent);
236 	return (ALTERED|STOP);
237 }
238 
239 chgdd(idesc)
240 	struct inodesc *idesc;
241 {
242 	register DIRECT *dirp = idesc->id_dirp;
243 
244 	if (dirp->d_name[0] == '.' && dirp->d_name[1] == '.' &&
245 	dirp->d_name[2] == 0) {
246 		dirp->d_ino = lfdir;
247 		return (ALTERED|STOP);
248 	}
249 	return (KEEPON);
250 }
251 
252 linkup(orphan, pdir)
253 	ino_t orphan;
254 	ino_t pdir;
255 {
256 	register DINODE *dp;
257 	int lostdir, len;
258 	struct inodesc idesc;
259 
260 	bzero((char *)&idesc, sizeof(struct inodesc));
261 	if ((dp = ginode(orphan)) == NULL)
262 		return (0);
263 	lostdir = DIRCT(dp);
264 	pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
265 	pinode(orphan);
266 	if (preen && dp->di_size == 0)
267 		return (0);
268 	if (preen)
269 		printf(" (RECONNECTED)\n");
270 	else
271 		if (reply("RECONNECT") == 0)
272 			return (0);
273 	pathp = pathname;
274 	*pathp++ = '/';
275 	*pathp = '\0';
276 	if (lfdir == 0) {
277 		if ((dp = ginode(ROOTINO)) == NULL)
278 			return (0);
279 		idesc.id_name = lfname;
280 		idesc.id_type = DATA;
281 		idesc.id_func = findino;
282 		idesc.id_number = ROOTINO;
283 		idesc.id_filesize = dp->di_size;
284 		(void)ckinode(dp, &idesc);
285 		if ((lfdir = idesc.id_parent) == 0) {
286 			pfatal("SORRY. NO lost+found DIRECTORY");
287 			printf("\n\n");
288 			return (0);
289 		}
290 	}
291 	if ((dp = ginode(lfdir)) == NULL ||
292 	     !DIRCT(dp) || statemap[lfdir] != FSTATE) {
293 		pfatal("SORRY. NO lost+found DIRECTORY");
294 		printf("\n\n");
295 		return (0);
296 	}
297 	if (fragoff(&sblock, dp->di_size)) {
298 		dp->di_size = fragroundup(&sblock, dp->di_size);
299 		inodirty();
300 	}
301 	len = strlen(lfname);
302 	bcopy(lfname, pathp, len + 1);
303 	pathp += len;
304 	idesc.id_type = DATA;
305 	idesc.id_func = mkentry;
306 	idesc.id_number = lfdir;
307 	idesc.id_filesize = dp->di_size;
308 	idesc.id_parent = orphan;	/* this is the inode to enter */
309 	idesc.id_fix = DONTKNOW;
310 	if ((ckinode(dp, &idesc) & ALTERED) == 0) {
311 		pfatal("SORRY. NO SPACE IN lost+found DIRECTORY");
312 		printf("\n\n");
313 		return (0);
314 	}
315 	lncntp[orphan]--;
316 	*pathp++ = '/';
317 	pathp += lftempname(pathp, orphan);
318 	if (lostdir) {
319 		dp = ginode(orphan);
320 		idesc.id_type = DATA;
321 		idesc.id_func = chgdd;
322 		idesc.id_number = orphan;
323 		idesc.id_filesize = dp->di_size;
324 		idesc.id_fix = DONTKNOW;
325 		(void)ckinode(dp, &idesc);
326 		if ((dp = ginode(lfdir)) != NULL) {
327 			dp->di_nlink++;
328 			inodirty();
329 			lncntp[lfdir]++;
330 		}
331 		pwarn("DIR I=%u CONNECTED. ", orphan);
332 		printf("PARENT WAS I=%u\n", pdir);
333 		if (preen == 0)
334 			printf("\n");
335 	}
336 	return (1);
337 }
338 
339 /*
340  * generate a temporary name for the lost+found directory.
341  */
342 lftempname(bufp, ino)
343 	char *bufp;
344 	ino_t ino;
345 {
346 	register ino_t in;
347 	register char *cp;
348 	int namlen;
349 
350 	cp = bufp + 2;
351 	for (in = imax; in > 0; in /= 10)
352 		cp++;
353 	*--cp = 0;
354 	namlen = cp - bufp;
355 	in = ino;
356 	while (cp > bufp) {
357 		*--cp = (in % 10) + '0';
358 		in /= 10;
359 	}
360 	*cp = '#';
361 	return (namlen);
362 }
363