xref: /openbsd-src/sbin/fsck_ext2fs/dir.c (revision b9fc9a728fce9c4289b7e9a992665e28d5629a54)
1 /*	$OpenBSD: dir.c,v 1.20 2015/01/16 06:39:57 deraadt Exp $	*/
2 /*	$NetBSD: dir.c,v 1.5 2000/01/28 16:01:46 bouyer Exp $	*/
3 
4 /*
5  * Copyright (c) 1997 Manuel Bouyer.
6  * Copyright (c) 1980, 1986, 1993
7  *	The Regents of the University of California.  All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. 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 #include <sys/param.h>	/* DEV_BSIZE roundup */
35 #include <sys/time.h>
36 #include <ufs/ufs/dir.h>
37 #include <ufs/ext2fs/ext2fs_dinode.h>
38 #include <ufs/ext2fs/ext2fs_dir.h>
39 #include <ufs/ext2fs/ext2fs.h>
40 
41 #include <ufs/ufs/dinode.h> /* for IFMT & friends */
42 
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <limits.h>
47 
48 #include "fsck.h"
49 #include "fsutil.h"
50 #include "extern.h"
51 
52 char	*lfname = "lost+found";
53 int	lfmode = 01777;
54 struct	ext2fs_dirtemplate emptydir = { 0, DIRBLKSIZ };
55 struct	ext2fs_dirtemplate dirhead = {
56 	0, 12, 1, EXT2_FT_DIR, ".",
57 	0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
58 };
59 #undef DIRBLKSIZ
60 
61 static int expanddir(struct ext2fs_dinode *, char *);
62 static void freedir(ino_t, ino_t);
63 static struct ext2fs_direct *fsck_readdir(struct inodesc *);
64 static struct bufarea *getdirblk(daddr32_t, long);
65 static int lftempname(char *, ino_t);
66 static int mkentry(struct inodesc *);
67 static int chgino(struct  inodesc *);
68 
69 /*
70  * Propagate connected state through the tree.
71  */
72 void
propagate(void)73 propagate(void)
74 {
75 	struct inoinfo **inpp, *inp, *pinp;
76 	struct inoinfo **inpend;
77 
78 	/*
79 	 * Create a list of children for each directory.
80 	 */
81 	inpend = &inpsort[inplast];
82 	for (inpp = inpsort; inpp < inpend; inpp++) {
83 		inp = *inpp;
84 		if (inp->i_parent == 0 ||
85 		    inp->i_number == EXT2_ROOTINO)
86 			continue;
87 		pinp = getinoinfo(inp->i_parent);
88 		inp->i_parentp = pinp;
89 		inp->i_sibling = pinp->i_child;
90 		pinp->i_child = inp;
91 	}
92 	inp = getinoinfo(EXT2_ROOTINO);
93 	while (inp) {
94 		statemap[inp->i_number] = DFOUND;
95 		if (inp->i_child &&
96 		    statemap[inp->i_child->i_number] == DSTATE)
97 			inp = inp->i_child;
98 		else if (inp->i_sibling)
99 			inp = inp->i_sibling;
100 		else
101 			inp = inp->i_parentp;
102 	}
103 }
104 
105 /*
106  * Scan each entry in a directory block.
107  */
108 int
dirscan(struct inodesc * idesc)109 dirscan(struct inodesc *idesc)
110 {
111 	struct ext2fs_direct *dp;
112 	struct bufarea *bp;
113 	int dsize, n;
114 	long blksiz;
115 	char *dbuf = NULL;
116 
117 	if ((dbuf = malloc(sblock.e2fs_bsize)) == NULL) {
118 		fprintf(stderr, "out of memory");
119 		exit(8);
120 	}
121 
122 	if (idesc->id_type != DATA)
123 		errexit("wrong type to dirscan %d\n", idesc->id_type);
124 	if (idesc->id_entryno == 0 &&
125 	    (idesc->id_filesize & (sblock.e2fs_bsize - 1)) != 0)
126 		idesc->id_filesize = roundup(idesc->id_filesize, sblock.e2fs_bsize);
127 	blksiz = idesc->id_numfrags * sblock.e2fs_bsize;
128 	if (chkrange(idesc->id_blkno, idesc->id_numfrags)) {
129 		idesc->id_filesize -= blksiz;
130 		free(dbuf);
131 		return (SKIP);
132 	}
133 	idesc->id_loc = 0;
134 	for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
135 		dsize = letoh16(dp->e2d_reclen);
136 		memcpy(dbuf, dp, (size_t)dsize);
137 		idesc->id_dirp = (struct ext2fs_direct *)dbuf;
138 		if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
139 			bp = getdirblk(idesc->id_blkno, blksiz);
140 			memcpy(bp->b_un.b_buf + idesc->id_loc - dsize, dbuf,
141 			    (size_t)dsize);
142 			dirty(bp);
143 			sbdirty();
144 		}
145 		if (n & STOP) {
146 			free(dbuf);
147 			return (n);
148 		}
149 	}
150 	free(dbuf);
151 	return (idesc->id_filesize > 0 ? KEEPON : STOP);
152 }
153 
154 /*
155  * get next entry in a directory.
156  */
157 static struct ext2fs_direct *
fsck_readdir(struct inodesc * idesc)158 fsck_readdir(struct inodesc *idesc)
159 {
160 	struct ext2fs_direct *dp, *ndp;
161 	struct bufarea *bp;
162 	long size, blksiz, fix, dploc;
163 
164 	blksiz = idesc->id_numfrags * sblock.e2fs_bsize;
165 	bp = getdirblk(idesc->id_blkno, blksiz);
166 	if (idesc->id_loc % sblock.e2fs_bsize == 0 && idesc->id_filesize > 0 &&
167 	    idesc->id_loc < blksiz) {
168 		dp = (struct ext2fs_direct *)(bp->b_un.b_buf + idesc->id_loc);
169 		if (dircheck(idesc, dp))
170 			goto dpok;
171 		if (idesc->id_fix == IGNORE)
172 			return (0);
173 		fix = dofix(idesc, "DIRECTORY CORRUPTED");
174 		bp = getdirblk(idesc->id_blkno, blksiz);
175 		dp = (struct ext2fs_direct *)(bp->b_un.b_buf + idesc->id_loc);
176 		dp->e2d_reclen = htole16(sblock.e2fs_bsize);
177 		dp->e2d_ino = 0;
178 		dp->e2d_namlen = 0;
179 		dp->e2d_type = 0;
180 		dp->e2d_name[0] = '\0';
181 		if (fix)
182 			dirty(bp);
183 		idesc->id_loc += sblock.e2fs_bsize;
184 		idesc->id_filesize -= sblock.e2fs_bsize;
185 		return (dp);
186 	}
187 dpok:
188 	if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
189 		return NULL;
190 	dploc = idesc->id_loc;
191 	dp = (struct ext2fs_direct *)(bp->b_un.b_buf + dploc);
192 	idesc->id_loc += letoh16(dp->e2d_reclen);
193 	idesc->id_filesize -= letoh16(dp->e2d_reclen);
194 	if ((idesc->id_loc % sblock.e2fs_bsize) == 0)
195 		return (dp);
196 	ndp = (struct ext2fs_direct *)(bp->b_un.b_buf + idesc->id_loc);
197 	if (idesc->id_loc < blksiz && idesc->id_filesize > 0 &&
198 	    dircheck(idesc, ndp) == 0) {
199 		size = sblock.e2fs_bsize - (idesc->id_loc % sblock.e2fs_bsize);
200 		idesc->id_loc += size;
201 		idesc->id_filesize -= size;
202 		if (idesc->id_fix == IGNORE)
203 			return (0);
204 		fix = dofix(idesc, "DIRECTORY CORRUPTED");
205 		bp = getdirblk(idesc->id_blkno, blksiz);
206 		dp = (struct ext2fs_direct *)(bp->b_un.b_buf + dploc);
207 		dp->e2d_reclen = htole16(letoh16(dp->e2d_reclen) + size);
208 		if (fix)
209 			dirty(bp);
210 	}
211 	return (dp);
212 }
213 
214 /*
215  * Verify that a directory entry is valid.
216  * This is a superset of the checks made in the kernel.
217  */
218 int
dircheck(struct inodesc * idesc,struct ext2fs_direct * dp)219 dircheck(struct inodesc *idesc, struct ext2fs_direct *dp)
220 {
221 	int size;
222 	char *cp;
223 	int spaceleft;
224 	u_int16_t reclen = letoh16(dp->e2d_reclen);
225 
226 	spaceleft = sblock.e2fs_bsize - (idesc->id_loc % sblock.e2fs_bsize);
227 	if (letoh32(dp->e2d_ino) > maxino ||
228 	    reclen == 0 ||
229 	    reclen > spaceleft ||
230 	    (reclen & 0x3) != 0)
231 		return (0);
232 	if (dp->e2d_ino == 0)
233 		return (1);
234 	if (sblock.e2fs.e2fs_rev < E2FS_REV1 ||
235 	    (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE) == 0)
236 		if (dp->e2d_type != 0)
237 			return (1);
238 	size = EXT2FS_DIRSIZ(dp->e2d_namlen);
239 	if (reclen < size ||
240 	    idesc->id_filesize < size ||
241 	    dp->e2d_namlen > EXT2FS_MAXNAMLEN)
242 		return (0);
243 	for (cp = dp->e2d_name, size = 0; size < dp->e2d_namlen; size++)
244 		if (*cp == '\0' || (*cp++ == '/'))
245 			return (0);
246 	return (1);
247 }
248 
249 void
direrror(ino_t ino,char * errmesg)250 direrror(ino_t ino, char *errmesg)
251 {
252 
253 	fileerror(ino, ino, errmesg);
254 }
255 
256 void
fileerror(ino_t cwd,ino_t ino,char * errmesg)257 fileerror(ino_t cwd, ino_t ino, char *errmesg)
258 {
259 	struct ext2fs_dinode *dp;
260 	char pathbuf[PATH_MAX + 1];
261 
262 	pwarn("%s ", errmesg);
263 	pinode(ino);
264 	printf("\n");
265 	getpathname(pathbuf, sizeof pathbuf, cwd, ino);
266 	if ((ino < EXT2_FIRSTINO && ino != EXT2_ROOTINO) || ino > maxino) {
267 		pfatal("NAME=%s\n", pathbuf);
268 		return;
269 	}
270 	dp = ginode(ino);
271 	if (ftypeok(dp))
272 		pfatal("%s=%s\n",
273 		    (letoh16(dp->e2di_mode) & IFMT) == IFDIR ? "DIR" : "FILE", pathbuf);
274 	else
275 		pfatal("NAME=%s\n", pathbuf);
276 }
277 
278 void
adjust(struct inodesc * idesc,short lcnt)279 adjust(struct inodesc *idesc, short lcnt)
280 {
281 	struct ext2fs_dinode *dp;
282 
283 	dp = ginode(idesc->id_number);
284 	if (letoh16(dp->e2di_nlink) == lcnt) {
285 		if (linkup(idesc->id_number, (ino_t)0) == 0)
286 			clri(idesc, "UNREF", 0);
287 	} else {
288 		pwarn("LINK COUNT %s", (lfdir == idesc->id_number) ? lfname :
289 			((letoh16(dp->e2di_mode) & IFMT) == IFDIR ? "DIR" : "FILE"));
290 		pinode(idesc->id_number);
291 		printf(" COUNT %d SHOULD BE %d",
292 			letoh16(dp->e2di_nlink), letoh16(dp->e2di_nlink) - lcnt);
293 		if (preen) {
294 			if (lcnt < 0) {
295 				printf("\n");
296 				pfatal("LINK COUNT INCREASING");
297 			}
298 			printf(" (ADJUSTED)\n");
299 		}
300 		if (preen || reply("ADJUST") == 1) {
301 			dp->e2di_nlink = htole16(letoh16(dp->e2di_nlink) - lcnt);
302 			inodirty();
303 		}
304 	}
305 }
306 
307 static int
mkentry(struct inodesc * idesc)308 mkentry(struct inodesc *idesc)
309 {
310 	struct ext2fs_direct *dirp = idesc->id_dirp;
311 	struct ext2fs_direct newent;
312 	int newlen, oldlen;
313 
314 	newent.e2d_type = EXT2_FT_UNKNOWN;
315 	newent.e2d_namlen = strlen(idesc->id_name);
316 	if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
317 	    (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
318 		newent.e2d_type = inot2ext2dt(typemap[idesc->id_parent]);
319 	newlen = EXT2FS_DIRSIZ(newent.e2d_namlen);
320 	if (dirp->e2d_ino != 0)
321 		oldlen = EXT2FS_DIRSIZ(dirp->e2d_namlen);
322 	else
323 		oldlen = 0;
324 	if (letoh16(dirp->e2d_reclen) - oldlen < newlen)
325 		return (KEEPON);
326 	newent.e2d_reclen = htole16(letoh16(dirp->e2d_reclen) - oldlen);
327 	dirp->e2d_reclen = htole16(oldlen);
328 	dirp = (struct ext2fs_direct *)(((char *)dirp) + oldlen);
329 	dirp->e2d_ino = htole32(idesc->id_parent); /* ino to be entered is in id_parent */
330 	dirp->e2d_reclen = newent.e2d_reclen;
331 	dirp->e2d_namlen = newent.e2d_namlen;
332 	dirp->e2d_type = newent.e2d_type;
333 	memcpy(dirp->e2d_name, idesc->id_name, (size_t)(dirp->e2d_namlen));
334 	return (ALTERED|STOP);
335 }
336 
337 static int
chgino(struct inodesc * idesc)338 chgino(struct inodesc *idesc)
339 {
340 	struct ext2fs_direct *dirp = idesc->id_dirp;
341 	u_int16_t namlen = dirp->e2d_namlen;
342 
343 	if (strlen(idesc->id_name) != namlen ||
344 		strncmp(dirp->e2d_name, idesc->id_name, (int)namlen))
345 		return (KEEPON);
346 	dirp->e2d_ino = htole32(idesc->id_parent);
347 	if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
348 	    (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
349 		dirp->e2d_type = inot2ext2dt(typemap[idesc->id_parent]);
350 	else
351 		dirp->e2d_type = 0;
352 	return (ALTERED|STOP);
353 }
354 
355 int
linkup(ino_t orphan,ino_t parentdir)356 linkup(ino_t orphan, ino_t parentdir)
357 {
358 	struct ext2fs_dinode *dp;
359 	int lostdir;
360 	ino_t oldlfdir;
361 	struct inodesc idesc;
362 	char tempname[BUFSIZ];
363 
364 	memset(&idesc, 0, sizeof(struct inodesc));
365 	dp = ginode(orphan);
366 	lostdir = (letoh16(dp->e2di_mode) & IFMT) == IFDIR;
367 	pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
368 	pinode(orphan);
369 	if (preen && inosize(dp) == 0)
370 		return (0);
371 	if (preen)
372 		printf(" (RECONNECTED)\n");
373 	else
374 		if (reply("RECONNECT") == 0)
375 			return (0);
376 	if (lfdir == 0) {
377 		dp = ginode(EXT2_ROOTINO);
378 		idesc.id_name = lfname;
379 		idesc.id_type = DATA;
380 		idesc.id_func = findino;
381 		idesc.id_number = EXT2_ROOTINO;
382 		if ((ckinode(dp, &idesc) & FOUND) != 0) {
383 			lfdir = idesc.id_parent;
384 		} else {
385 			pwarn("NO lost+found DIRECTORY");
386 			if (preen || reply("CREATE")) {
387 				lfdir = allocdir(EXT2_ROOTINO, (ino_t)0, lfmode);
388 				if (lfdir != 0) {
389 					if (makeentry(EXT2_ROOTINO, lfdir, lfname) != 0) {
390 						if (preen)
391 							printf(" (CREATED)\n");
392 					} else {
393 						freedir(lfdir, EXT2_ROOTINO);
394 						lfdir = 0;
395 						if (preen)
396 							printf("\n");
397 					}
398 				}
399 			}
400 		}
401 		if (lfdir == 0) {
402 			pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY");
403 			printf("\n\n");
404 			return (0);
405 		}
406 	}
407 	dp = ginode(lfdir);
408 	if ((letoh16(dp->e2di_mode) & IFMT) != IFDIR) {
409 		pfatal("lost+found IS NOT A DIRECTORY");
410 		if (reply("REALLOCATE") == 0)
411 			return (0);
412 		oldlfdir = lfdir;
413 		if ((lfdir = allocdir(EXT2_ROOTINO, (ino_t)0, lfmode)) == 0) {
414 			pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
415 			return (0);
416 		}
417 		if ((changeino(EXT2_ROOTINO, lfname, lfdir) & ALTERED) == 0) {
418 			pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
419 			return (0);
420 		}
421 		inodirty();
422 		idesc.id_type = ADDR;
423 		idesc.id_func = pass4check;
424 		idesc.id_number = oldlfdir;
425 		adjust(&idesc, lncntp[oldlfdir] + 1);
426 		lncntp[oldlfdir] = 0;
427 		dp = ginode(lfdir);
428 	}
429 	if (statemap[lfdir] != DFOUND) {
430 		pfatal("SORRY. NO lost+found DIRECTORY\n\n");
431 		return (0);
432 	}
433 	(void)lftempname(tempname, orphan);
434 	if (makeentry(lfdir, orphan, tempname) == 0) {
435 		pfatal("SORRY. NO SPACE IN lost+found DIRECTORY");
436 		printf("\n\n");
437 		return (0);
438 	}
439 	lncntp[orphan]--;
440 	if (lostdir) {
441 		if ((changeino(orphan, "..", lfdir) & ALTERED) == 0 &&
442 		    parentdir != (ino_t)-1)
443 			(void)makeentry(orphan, lfdir, "..");
444 		dp = ginode(lfdir);
445 		dp->e2di_nlink = htole16(letoh16(dp->e2di_nlink) +1);
446 		inodirty();
447 		lncntp[lfdir]++;
448 		pwarn("DIR I=%llu CONNECTED. ", (unsigned long long)orphan);
449 		if (parentdir != (ino_t)-1)
450 			printf("PARENT WAS I=%llu\n",
451 			    (unsigned long long)parentdir);
452 		if (preen == 0)
453 			printf("\n");
454 	}
455 	return (1);
456 }
457 
458 /*
459  * fix an entry in a directory.
460  */
461 int
changeino(ino_t dir,char * name,ino_t newnum)462 changeino(ino_t dir, char *name, ino_t newnum)
463 {
464 	struct inodesc idesc;
465 
466 	memset(&idesc, 0, sizeof(struct inodesc));
467 	idesc.id_type = DATA;
468 	idesc.id_func = chgino;
469 	idesc.id_number = dir;
470 	idesc.id_fix = DONTKNOW;
471 	idesc.id_name = name;
472 	idesc.id_parent = newnum;	/* new value for name */
473 	return (ckinode(ginode(dir), &idesc));
474 }
475 
476 /*
477  * make an entry in a directory
478  */
479 int
makeentry(ino_t parent,ino_t ino,char * name)480 makeentry(ino_t parent, ino_t ino, char *name)
481 {
482 	struct ext2fs_dinode *dp;
483 	struct inodesc idesc;
484 	char pathbuf[PATH_MAX + 1];
485 
486 	if ((parent < EXT2_FIRSTINO && parent != EXT2_ROOTINO)
487 		|| parent >= maxino ||
488 	    (ino < EXT2_FIRSTINO && ino < EXT2_ROOTINO) || ino >= maxino)
489 		return (0);
490 	memset(&idesc, 0, sizeof(struct inodesc));
491 	idesc.id_type = DATA;
492 	idesc.id_func = mkentry;
493 	idesc.id_number = parent;
494 	idesc.id_parent = ino;	/* this is the inode to enter */
495 	idesc.id_fix = DONTKNOW;
496 	idesc.id_name = name;
497 	dp = ginode(parent);
498 	if (inosize(dp) % sblock.e2fs_bsize) {
499 		inossize(dp, roundup(inosize(dp), sblock.e2fs_bsize));
500 		inodirty();
501 	}
502 	if ((ckinode(dp, &idesc) & ALTERED) != 0)
503 		return (1);
504 	getpathname(pathbuf, sizeof pathbuf, parent, parent);
505 	dp = ginode(parent);
506 	if (expanddir(dp, pathbuf) == 0)
507 		return (0);
508 	return (ckinode(dp, &idesc) & ALTERED);
509 }
510 
511 /*
512  * Attempt to expand the size of a directory
513  */
514 static int
expanddir(struct ext2fs_dinode * dp,char * name)515 expanddir(struct ext2fs_dinode *dp, char *name)
516 {
517 	daddr32_t lastbn, newblk;
518 	struct bufarea *bp;
519 	char *firstblk;
520 
521 	lastbn = lblkno(&sblock, inosize(dp));
522 	if (lastbn >= NDADDR - 1 || letoh32(dp->e2di_blocks[lastbn]) == 0 ||
523 		inosize(dp) == 0)
524 		return (0);
525 	if ((newblk = allocblk()) == 0)
526 		return (0);
527 	dp->e2di_blocks[lastbn + 1] = dp->e2di_blocks[lastbn];
528 	dp->e2di_blocks[lastbn] = htole32(newblk);
529 	inossize(dp, inosize(dp) + sblock.e2fs_bsize);
530 	dp->e2di_nblock = htole32(letoh32(dp->e2di_nblock) + 1);
531 	bp = getdirblk(letoh32(dp->e2di_blocks[lastbn + 1]),
532 		sblock.e2fs_bsize);
533 	if (bp->b_errs)
534 		goto bad;
535 	if ((firstblk = malloc(sblock.e2fs_bsize)) == NULL) {
536 		fprintf(stderr, "out of memory\n");
537 		exit(8);
538 	}
539 	memcpy(firstblk, bp->b_un.b_buf, sblock.e2fs_bsize);
540 	bp = getdirblk(newblk, sblock.e2fs_bsize);
541 	if (bp->b_errs) {
542 		free(firstblk);
543 		goto bad;
544 	}
545 	memcpy(bp->b_un.b_buf, firstblk, sblock.e2fs_bsize);
546 	free(firstblk);
547 	dirty(bp);
548 	bp = getdirblk(letoh32(dp->e2di_blocks[lastbn + 1]),
549 		sblock.e2fs_bsize);
550 	if (bp->b_errs)
551 		goto bad;
552 	emptydir.dot_reclen = htole16(sblock.e2fs_bsize);
553 	memcpy(bp->b_un.b_buf, &emptydir, sizeof emptydir);
554 	pwarn("NO SPACE LEFT IN %s", name);
555 	if (preen)
556 		printf(" (EXPANDED)\n");
557 	else if (reply("EXPAND") == 0)
558 		goto bad;
559 	dirty(bp);
560 	inodirty();
561 	return (1);
562 bad:
563 	dp->e2di_blocks[lastbn] = dp->e2di_blocks[lastbn + 1];
564 	dp->e2di_blocks[lastbn + 1] = 0;
565 	dp->e2di_size = htole32(letoh32(dp->e2di_size) - sblock.e2fs_bsize);
566 	inossize(dp, inosize(dp) - sblock.e2fs_bsize);
567 	dp->e2di_nblock = htole32(letoh32(dp->e2di_nblock) - 1);
568 	freeblk(newblk);
569 	return (0);
570 }
571 
572 /*
573  * allocate a new directory
574  */
575 int
allocdir(ino_t parent,ino_t request,int mode)576 allocdir(ino_t parent, ino_t request, int mode)
577 {
578 	ino_t ino;
579 	struct ext2fs_dinode *dp;
580 	struct bufarea *bp;
581 	struct ext2fs_dirtemplate *dirp;
582 
583 	ino = allocino(request, IFDIR|mode);
584 	dirhead.dot_reclen = htole16(12); /* XXX */
585 	dirhead.dotdot_reclen = htole16(sblock.e2fs_bsize - 12); /* XXX */
586 	dirhead.dot_namlen = 1;
587 	if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
588 	    (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
589 		dirhead.dot_type = EXT2_FT_DIR;
590 	else
591 		dirhead.dot_type = 0;
592 	dirhead.dotdot_namlen = 2;
593 	if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
594 	    (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
595 		dirhead.dotdot_type = EXT2_FT_DIR;
596 	else
597 		dirhead.dotdot_type = 0;
598 	dirp = &dirhead;
599 	dirp->dot_ino = htole32(ino);
600 	dirp->dotdot_ino = htole32(parent);
601 	dp = ginode(ino);
602 	bp = getdirblk(letoh32(dp->e2di_blocks[0]), sblock.e2fs_bsize);
603 	if (bp->b_errs) {
604 		freeino(ino);
605 		return (0);
606 	}
607 	memcpy(bp->b_un.b_buf, dirp, sizeof(struct ext2fs_dirtemplate));
608 	dirty(bp);
609 	dp->e2di_nlink = htole16(2);
610 	inodirty();
611 	if (ino == EXT2_ROOTINO) {
612 		lncntp[ino] = letoh16(dp->e2di_nlink);
613 		cacheino(dp, ino);
614 		return(ino);
615 	}
616 	if (statemap[parent] != DSTATE && statemap[parent] != DFOUND) {
617 		freeino(ino);
618 		return (0);
619 	}
620 	cacheino(dp, ino);
621 	statemap[ino] = statemap[parent];
622 	if (statemap[ino] == DSTATE) {
623 		lncntp[ino] = letoh16(dp->e2di_nlink);
624 		lncntp[parent]++;
625 	}
626 	dp = ginode(parent);
627 	dp->e2di_nlink = htole16(letoh16(dp->e2di_nlink) + 1);
628 	inodirty();
629 	return (ino);
630 }
631 
632 /*
633  * free a directory inode
634  */
635 static void
freedir(ino_t ino,ino_t parent)636 freedir(ino_t ino, ino_t parent)
637 {
638 	struct ext2fs_dinode *dp;
639 
640 	if (ino != parent) {
641 		dp = ginode(parent);
642 		dp->e2di_nlink = htole16(letoh16(dp->e2di_nlink) - 1);
643 		inodirty();
644 	}
645 	freeino(ino);
646 }
647 
648 /*
649  * generate a temporary name for the lost+found directory.
650  */
651 static int
lftempname(char * bufp,ino_t ino)652 lftempname(char *bufp, ino_t ino)
653 {
654 	ino_t in;
655 	char *cp;
656 	int namlen;
657 
658 	cp = bufp + 2;
659 	for (in = maxino; in > 0; in /= 10)
660 		cp++;
661 	*--cp = 0;
662 	namlen = cp - bufp;
663 	in = ino;
664 	while (cp > bufp) {
665 		*--cp = (in % 10) + '0';
666 		in /= 10;
667 	}
668 	*cp = '#';
669 	return (namlen);
670 }
671 
672 /*
673  * Get a directory block.
674  * Insure that it is held until another is requested.
675  */
676 static struct bufarea *
getdirblk(daddr32_t blkno,long size)677 getdirblk(daddr32_t blkno, long size)
678 {
679 
680 	if (pdirbp != 0)
681 		pdirbp->b_flags &= ~B_INUSE;
682 	pdirbp = getdatablk(blkno, size);
683 	return (pdirbp);
684 }
685