1 /* $NetBSD: lfs_inode.c,v 1.29 2024/05/12 23:55:57 msaitoh Exp $ */
2
3 /*-
4 * Copyright (c) 1980, 1991, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993, 1994\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/1/95";
41 #else
42 __RCSID("$NetBSD: lfs_inode.c,v 1.29 2024/05/12 23:55:57 msaitoh Exp $");
43 #endif
44 #endif /* not lint */
45
46 #include <sys/param.h>
47 #include <sys/time.h>
48 #include <sys/stat.h>
49 #include <sys/mount.h>
50
51 #include <ctype.h>
52 #include <errno.h>
53 #include <fcntl.h>
54 #include <fts.h>
55 #include <stdio.h>
56 #include <string.h>
57 #include <unistd.h>
58
59 #include "dump.h"
60 #undef di_inumber
61
62 #define HASDUMPEDFILE 0x1
63 #define HASSUBDIRS 0x2
64
65 struct lfs *sblock;
66
67 int is_ufs2 = 0;
68
69 /*
70 * Read the superblock from disk, and check its magic number.
71 * Determine whether byte-swapping needs to be done on this filesystem.
72 */
73 int
fs_read_sblock(char * superblock)74 fs_read_sblock(char *superblock)
75 {
76 /*
77 * XXX this should not be assuming that the in-memory
78 * superblock has the on-disk superblock at the front of the
79 * structure.
80 */
81 union {
82 char tbuf[LFS_SBPAD];
83 struct lfs lfss;
84 } u;
85
86 off_t sboff = LFS_LABELPAD;
87
88 sblock = (struct lfs *)superblock;
89 while(1) {
90 rawread(sboff, (char *) sblock, LFS_SBPAD);
91 switch (sblock->lfs_dlfs_u.u_32.dlfs_magic) {
92 case LFS_MAGIC:
93 sblock->lfs_is64 = false;
94 sblock->lfs_dobyteswap = false;
95 break;
96 case LFS_MAGIC_SWAPPED:
97 sblock->lfs_is64 = false;
98 sblock->lfs_dobyteswap = true;
99 break;
100 case LFS64_MAGIC:
101 sblock->lfs_is64 = true;
102 sblock->lfs_dobyteswap = false;
103 break;
104 case LFS64_MAGIC_SWAPPED:
105 sblock->lfs_is64 = true;
106 sblock->lfs_dobyteswap = true;
107 break;
108 default:
109 quit("bad sblock magic number\n");
110 break;
111 }
112 if (lfs_fsbtob(sblock, (off_t)lfs_sb_getsboff(sblock, 0)) != sboff) {
113 sboff = lfs_fsbtob(sblock, (off_t)lfs_sb_getsboff(sblock, 0));
114 continue;
115 }
116 break;
117 }
118
119 /*
120 * Read the secondary and take the older of the two
121 */
122 rawread(lfs_fsbtob(sblock, (off_t)lfs_sb_getsboff(sblock, 1)), u.tbuf,
123 sizeof(u.tbuf));
124
125 if (u.lfss.lfs_dlfs_u.u_32.dlfs_magic !=
126 sblock->lfs_dlfs_u.u_32.dlfs_magic) {
127 msg("Warning: secondary superblock at 0x%" PRIx64 " mismatched or wrong magic\n",
128 LFS_FSBTODB(sblock, (off_t)lfs_sb_getsboff(sblock, 1)));
129 } else {
130 u.lfss.lfs_is64 = sblock->lfs_is64;
131 u.lfss.lfs_dobyteswap = sblock->lfs_dobyteswap;
132
133 if (lfs_sb_getversion(sblock) > 1) {
134 if (lfs_sb_getserial(&u.lfss) < lfs_sb_getserial(sblock)) {
135 memcpy(sblock, u.tbuf, sizeof(u.tbuf));
136 sboff = lfs_fsbtob(sblock, (off_t)lfs_sb_getsboff(sblock, 1));
137 }
138 } else {
139 if (lfs_sb_getotstamp(&u.lfss) < lfs_sb_getotstamp(sblock)) {
140 memcpy(sblock, u.tbuf, sizeof(u.tbuf));
141 sboff = lfs_fsbtob(sblock, (off_t)lfs_sb_getsboff(sblock, 1));
142 }
143 }
144 }
145 if (sboff != LFS_SBPAD) {
146 msg("Using superblock at alternate location 0x%lx\n",
147 (unsigned long)(btodb(sboff)));
148 }
149
150 /* ugh */
151 is_ufs2 = sblock->lfs_is64;
152
153 /*
154 * XXX for now dump won't work on lfs64 because of the 64-bit
155 * inodes in directories. dump needs more abstraction.
156 */
157 if (sblock->lfs_is64) {
158 quit("LFS64 directory entries not supported yet");
159 }
160
161 return sblock->lfs_dobyteswap;
162 }
163
164 /*
165 * Fill in the ufsi struct, as well as the maxino and dev_bsize global
166 * variables.
167 */
168 struct ufsi *
fs_parametrize(void)169 fs_parametrize(void)
170 {
171 static struct ufsi ufsi;
172
173 spcl.c_flags = iswap32(iswap32(spcl.c_flags) | DR_NEWINODEFMT);
174
175 ufsi.ufs_dsize = LFS_FSBTODB(sblock, lfs_sb_getsize(sblock));
176 if (lfs_sb_getversion(sblock) == 1)
177 ufsi.ufs_dsize = lfs_sb_getsize(sblock) >> lfs_sb_getblktodb(sblock);
178 ufsi.ufs_bsize = lfs_sb_getbsize(sblock);
179 ufsi.ufs_bshift = lfs_sb_getbshift(sblock);
180 ufsi.ufs_fsize = lfs_sb_getfsize(sblock);
181 ufsi.ufs_frag = lfs_sb_getfrag(sblock);
182 ufsi.ufs_fsatoda = lfs_sb_getfsbtodb(sblock);
183 if (lfs_sb_getversion(sblock) == 1)
184 ufsi.ufs_fsatoda = 0;
185 ufsi.ufs_nindir = lfs_sb_getnindir(sblock);
186 ufsi.ufs_inopb = lfs_sb_getinopb(sblock);
187 ufsi.ufs_maxsymlinklen = lfs_sb_getmaxsymlinklen(sblock);
188 ufsi.ufs_bmask = ~(lfs_sb_getbmask(sblock));
189 ufsi.ufs_qbmask = lfs_sb_getbmask(sblock);
190 ufsi.ufs_fmask = ~(lfs_sb_getffmask(sblock));
191 ufsi.ufs_qfmask = lfs_sb_getffmask(sblock);
192
193 dev_bsize = lfs_sb_getbsize(sblock) >> lfs_sb_getblktodb(sblock);
194
195 return &ufsi;
196 }
197
198 ino_t
fs_maxino(void)199 fs_maxino(void)
200 {
201 return ((getino(LFS_IFILE_INUM)->dp1.di_size
202 - (lfs_sb_getcleansz(sblock) + lfs_sb_getsegtabsz(sblock))
203 * lfs_sb_getbsize(sblock))
204 / lfs_sb_getbsize(sblock)) * lfs_sb_getifpb(sblock) - 1;
205 }
206
207 void
fs_mapinodes(ino_t maxino,u_int64_t * tapesz,int * anydirskipped)208 fs_mapinodes(ino_t maxino, u_int64_t *tapesz, int *anydirskipped)
209 {
210 ino_t ino;
211
212 for (ino = ULFS_ROOTINO; ino < maxino; ino++)
213 mapfileino(ino, tapesz, anydirskipped);
214 }
215
216 /*
217 * XXX KS - I know there's a better way to do this.
218 */
219 #define BASE_SINDIR (ULFS_NDADDR)
220 #define BASE_DINDIR (ULFS_NDADDR+LFS_NINDIR(fs))
221 #define BASE_TINDIR (ULFS_NDADDR+LFS_NINDIR(fs)+LFS_NINDIR(fs)*LFS_NINDIR(fs))
222
223 #define D_UNITS (LFS_NINDIR(fs))
224 #define T_UNITS (LFS_NINDIR(fs)*LFS_NINDIR(fs))
225
226 static daddr_t
lfs_bmap(struct lfs * fs,union lfs_dinode * idinode,daddr_t lbn)227 lfs_bmap(struct lfs *fs, union lfs_dinode *idinode, daddr_t lbn)
228 {
229 daddr_t residue, up;
230 int off=0;
231 char bp[MAXBSIZE];
232
233 up = UNASSIGNED; /* XXXGCC -Wuninitialized [sh3] */
234
235 if(lbn > 0 && lbn > lfs_lblkno(fs, lfs_dino_getsize(fs, idinode))) {
236 return UNASSIGNED;
237 }
238 /*
239 * Indirect blocks: if it is a first-level indirect, pull its
240 * address from the inode; otherwise, call ourselves to find the
241 * address of the parent indirect block, and load that to find
242 * the desired address.
243 */
244 if(lbn < 0) {
245 lbn *= -1;
246 if (lbn == ULFS_NDADDR) {
247 /* printf("lbn %d: single indir base\n", -lbn); */
248 return lfs_dino_getib(fs, idinode, 0); /* single indirect */
249 } else if(lbn == BASE_DINDIR+1) {
250 /* printf("lbn %d: double indir base\n", -lbn); */
251 return lfs_dino_getib(fs, idinode, 1); /* double indirect */
252 } else if(lbn == BASE_TINDIR+2) {
253 /* printf("lbn %d: triple indir base\n", -lbn); */
254 return lfs_dino_getib(fs, idinode, 2); /* triple indirect */
255 }
256
257 /*
258 * Find the immediate parent. This is essentially finding the
259 * residue of modulus, and then rounding accordingly.
260 */
261 residue = (lbn-ULFS_NDADDR) % LFS_NINDIR(fs);
262 if(residue == 1) {
263 /* Double indirect. Parent is the triple. */
264 up = lfs_dino_getib(fs, idinode, 2);
265 off = (lbn-2-BASE_TINDIR)/(LFS_NINDIR(fs)*LFS_NINDIR(fs));
266 if(up == UNASSIGNED || up == LFS_UNUSED_DADDR)
267 return UNASSIGNED;
268 /* printf("lbn %d: parent is the triple\n", -lbn); */
269 bread(LFS_FSBTODB(sblock, up), bp, lfs_sb_getbsize(sblock));
270 return lfs_iblock_get(fs, bp, off);
271 } else /* residue == 0 */ {
272 /* Single indirect. Two cases. */
273 if(lbn < BASE_TINDIR) {
274 /* Parent is the double, simple */
275 up = -(BASE_DINDIR) - 1;
276 off = (lbn-BASE_DINDIR) / D_UNITS;
277 /* printf("lbn %d: parent is %d/%d\n", -lbn, up,off); */
278 } else {
279 /* Ancestor is the triple, more complex */
280 up = ((lbn-BASE_TINDIR) / T_UNITS)
281 * T_UNITS + BASE_TINDIR + 1;
282 off = (lbn/D_UNITS) - (up/D_UNITS);
283 up = -up;
284 /* printf("lbn %d: parent is %d/%d\n", -lbn, up,off); */
285 }
286 }
287 } else {
288 /* Direct block. Its parent must be a single indirect. */
289 if (lbn < ULFS_NDADDR)
290 return lfs_dino_getdb(fs, idinode, lbn);
291 else {
292 /* Parent is an indirect block. */
293 up = -(((lbn-ULFS_NDADDR) / D_UNITS) * D_UNITS + ULFS_NDADDR);
294 off = (lbn-ULFS_NDADDR) % D_UNITS;
295 /* printf("lbn %d: parent is %d/%d\n", lbn,up,off); */
296 }
297 }
298 up = lfs_bmap(fs,idinode,up);
299 if(up == UNASSIGNED || up == LFS_UNUSED_DADDR)
300 return UNASSIGNED;
301 bread(LFS_FSBTODB(sblock, up), bp, lfs_sb_getbsize(sblock));
302 return lfs_iblock_get(fs, bp, off);
303 }
304
305 static IFILE *
lfs_ientry(ino_t ino)306 lfs_ientry(ino_t ino)
307 {
308 static char ifileblock[MAXBSIZE];
309 static daddr_t ifblkno;
310 daddr_t lbn;
311 daddr_t blkno;
312 union dinode *dp;
313 union lfs_dinode *ldp;
314 unsigned index;
315
316 lbn = ino/lfs_sb_getifpb(sblock) + lfs_sb_getcleansz(sblock) + lfs_sb_getsegtabsz(sblock);
317 dp = getino(LFS_IFILE_INUM);
318 /* XXX this is foolish */
319 if (sblock->lfs_is64) {
320 ldp = (union lfs_dinode *)&dp->dlp64;
321 } else {
322 ldp = (union lfs_dinode *)&dp->dlp32;
323 }
324 blkno = lfs_bmap(sblock, ldp, lbn);
325 if (blkno != ifblkno)
326 bread(LFS_FSBTODB(sblock, blkno), ifileblock,
327 lfs_sb_getbsize(sblock));
328 index = ino % lfs_sb_getifpb(sblock);
329 if (sblock->lfs_is64) {
330 return (IFILE *) &((IFILE64 *)ifileblock)[index];
331 } else if (lfs_sb_getversion(sblock) > 1) {
332 return (IFILE *) &((IFILE32 *)ifileblock)[index];
333 } else {
334 return (IFILE *) &((IFILE_V1 *)ifileblock)[index];
335 }
336 }
337
338 /* Search a block for a specific dinode. */
339 static union lfs_dinode *
lfs_ifind(struct lfs * fs,ino_t ino,void * block)340 lfs_ifind(struct lfs *fs, ino_t ino, void *block)
341 {
342 union lfs_dinode *dip;
343 unsigned i, num;
344
345 num = LFS_INOPB(fs);
346 for (i = num; i-- > 0; ) {
347 dip = DINO_IN_BLOCK(fs, block, i);
348 if (lfs_dino_getinumber(fs, dip) == ino)
349 return dip;
350 }
351 return NULL;
352 }
353
354 union dinode *
getino(ino_t inum)355 getino(ino_t inum)
356 {
357 static daddr_t inoblkno;
358 daddr_t blkno;
359 static union {
360 char space[MAXBSIZE];
361 struct lfs64_dinode u_64[MAXBSIZE/sizeof(struct lfs64_dinode)];
362 struct lfs32_dinode u_32[MAXBSIZE/sizeof(struct lfs32_dinode)];
363 } inoblock;
364 static union dinode ifile_dinode; /* XXX fill this in */
365 static union dinode empty_dinode; /* Always stays zeroed */
366 union lfs_dinode *dp;
367 ino_t inum2;
368
369 if (inum == LFS_IFILE_INUM) {
370 /* Load the ifile inode if not already */
371 inum2 = sblock->lfs_is64 ?
372 ifile_dinode.dlp64.di_inumber :
373 ifile_dinode.dlp32.di_inumber;
374 if (inum2 == 0) {
375 blkno = lfs_sb_getidaddr(sblock);
376 bread(LFS_FSBTODB(sblock, blkno), inoblock.space,
377 (int)lfs_sb_getbsize(sblock));
378 dp = lfs_ifind(sblock, inum, inoblock.space);
379 /* Structure copy */
380 if (sblock->lfs_is64) {
381 ifile_dinode.dlp64 = dp->u_64;
382 } else {
383 ifile_dinode.dlp32 = dp->u_32;
384 }
385 }
386 return &ifile_dinode;
387 }
388
389 curino = inum;
390 blkno = lfs_if_getdaddr(sblock, lfs_ientry(inum));
391 if(blkno == LFS_UNUSED_DADDR)
392 return &empty_dinode;
393
394 if(blkno != inoblkno) {
395 bread(LFS_FSBTODB(sblock, blkno), inoblock.space,
396 (int)lfs_sb_getbsize(sblock));
397 }
398 return (void *)lfs_ifind(sblock, inum, inoblock.space);
399 }
400
401 /*
402 * Tell the filesystem not to overwrite any currently dirty segments
403 * until we are finished. (It may still write into clean segments, of course,
404 * since we're not using those.) This is only called when dump_lfs is called
405 * with -X, i.e. we are working on a mounted filesystem.
406 */
407 static int root_fd = -1;
408 char *wrap_mpname;
409
410 int
lfs_wrap_stop(char * mpname)411 lfs_wrap_stop(char *mpname)
412 {
413 int waitfor = 0;
414
415 root_fd = open(mpname, O_RDONLY, 0);
416 if (root_fd < 0)
417 return -1;
418 wrap_mpname = mpname;
419 fcntl(root_fd, LFCNREWIND, -1); /* Ignore return value */
420 if (fcntl(root_fd, LFCNWRAPSTOP, &waitfor) < 0) {
421 perror("LFCNWRAPSTOP");
422 return -1;
423 }
424 msg("Disabled log wrap on %s\n", mpname);
425 return 0;
426 }
427
428 /*
429 * Allow the filesystem to continue normal operation.
430 * This would happen anyway when we exit; we do it explicitly here
431 * to show the message, for the user's benefit.
432 */
433 void
lfs_wrap_go(void)434 lfs_wrap_go(void)
435 {
436 int waitfor = 0;
437
438 if (root_fd < 0)
439 return;
440
441 fcntl(root_fd, LFCNWRAPGO, &waitfor);
442 close(root_fd);
443 root_fd = -1;
444 msg("Re-enabled log wrap on %s\n", wrap_mpname);
445 }
446