1 /*
2 * rehash.c --- rebuild hash tree directories
3 *
4 * Copyright (C) 2002 Theodore Ts'o
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 *
11 * This algorithm is designed for simplicity of implementation and to
12 * pack the directory as much as possible. It however requires twice
13 * as much memory as the size of the directory. The maximum size
14 * directory supported using a 4k blocksize is roughly a gigabyte, and
15 * so there may very well be problems with machines that don't have
16 * virtual memory, and obscenely large directories.
17 *
18 * An alternate algorithm which is much more disk intensive could be
19 * written, and probably will need to be written in the future. The
20 * design goals of such an algorithm are: (a) use (roughly) constant
21 * amounts of memory, no matter how large the directory, (b) the
22 * directory must be safe at all times, even if e2fsck is interrupted
23 * in the middle, (c) we must use minimal amounts of extra disk
24 * blocks. This pretty much requires an incremental approach, where
25 * we are reading from one part of the directory, and inserting into
26 * the front half. So the algorithm will have to keep track of a
27 * moving block boundary between the new tree and the old tree, and
28 * files will need to be moved from the old directory and inserted
29 * into the new tree. If the new directory requires space which isn't
30 * yet available, blocks from the beginning part of the old directory
31 * may need to be moved to the end of the directory to make room for
32 * the new tree:
33 *
34 * --------------------------------------------------------
35 * | new tree | | old tree |
36 * --------------------------------------------------------
37 * ^ ptr ^ptr
38 * tail new head old
39 *
40 * This is going to be a pain in the tuckus to implement, and will
41 * require a lot more disk accesses. So I'm going to skip it for now;
42 * it's only really going to be an issue for really, really big
43 * filesystems (when we reach the level of tens of millions of files
44 * in a single directory). It will probably be easier to simply
45 * require that e2fsck use VM first.
46 */
47
48 #include <string.h>
49 #include <ctype.h>
50 #include <errno.h>
51 #include "e2fsck.h"
52 #include "problem.h"
53
54 struct fill_dir_struct {
55 char *buf;
56 struct ext2_inode *inode;
57 errcode_t err;
58 e2fsck_t ctx;
59 struct hash_entry *harray;
60 int max_array, num_array;
61 unsigned int dir_size;
62 int compress;
63 ino_t parent;
64 };
65
66 struct hash_entry {
67 ext2_dirhash_t hash;
68 ext2_dirhash_t minor_hash;
69 ino_t ino;
70 struct ext2_dir_entry *dir;
71 };
72
73 struct out_dir {
74 int num;
75 int max;
76 char *buf;
77 ext2_dirhash_t *hashes;
78 };
79
fill_dir_block(ext2_filsys fs,blk64_t * block_nr,e2_blkcnt_t blockcnt,blk64_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * priv_data)80 static int fill_dir_block(ext2_filsys fs,
81 blk64_t *block_nr,
82 e2_blkcnt_t blockcnt,
83 blk64_t ref_block EXT2FS_ATTR((unused)),
84 int ref_offset EXT2FS_ATTR((unused)),
85 void *priv_data)
86 {
87 struct fill_dir_struct *fd = (struct fill_dir_struct *) priv_data;
88 struct hash_entry *new_array, *ent;
89 struct ext2_dir_entry *dirent;
90 char *dir;
91 unsigned int offset, dir_offset, rec_len;
92 int hash_alg;
93
94 if (blockcnt < 0)
95 return 0;
96
97 offset = blockcnt * fs->blocksize;
98 if (offset + fs->blocksize > fd->inode->i_size) {
99 fd->err = EXT2_ET_DIR_CORRUPTED;
100 return BLOCK_ABORT;
101 }
102 dir = (fd->buf+offset);
103 if (HOLE_BLKADDR(*block_nr)) {
104 memset(dir, 0, fs->blocksize);
105 dirent = (struct ext2_dir_entry *) dir;
106 (void) ext2fs_set_rec_len(fs, fs->blocksize, dirent);
107 } else {
108 fd->err = ext2fs_read_dir_block3(fs, *block_nr, dir, 0);
109 if (fd->err)
110 return BLOCK_ABORT;
111 }
112 hash_alg = fs->super->s_def_hash_version;
113 if ((hash_alg <= EXT2_HASH_TEA) &&
114 (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
115 hash_alg += 3;
116 /* While the directory block is "hot", index it. */
117 dir_offset = 0;
118 while (dir_offset < fs->blocksize) {
119 dirent = (struct ext2_dir_entry *) (dir + dir_offset);
120 (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
121 if (((dir_offset + rec_len) > fs->blocksize) ||
122 (rec_len < 8) ||
123 ((rec_len % 4) != 0) ||
124 (((dirent->name_len & 0xFF)+8U) > rec_len)) {
125 fd->err = EXT2_ET_DIR_CORRUPTED;
126 return BLOCK_ABORT;
127 }
128 dir_offset += rec_len;
129 if (dirent->inode == 0)
130 continue;
131 if (!fd->compress && ((dirent->name_len&0xFF) == 1) &&
132 (dirent->name[0] == '.'))
133 continue;
134 if (!fd->compress && ((dirent->name_len&0xFF) == 2) &&
135 (dirent->name[0] == '.') && (dirent->name[1] == '.')) {
136 fd->parent = dirent->inode;
137 continue;
138 }
139 if (fd->num_array >= fd->max_array) {
140 new_array = realloc(fd->harray,
141 sizeof(struct hash_entry) * (fd->max_array+500));
142 if (!new_array) {
143 fd->err = ENOMEM;
144 return BLOCK_ABORT;
145 }
146 fd->harray = new_array;
147 fd->max_array += 500;
148 }
149 ent = fd->harray + fd->num_array++;
150 ent->dir = dirent;
151 fd->dir_size += EXT2_DIR_REC_LEN(dirent->name_len & 0xFF);
152 ent->ino = dirent->inode;
153 if (fd->compress)
154 ent->hash = ent->minor_hash = 0;
155 else {
156 fd->err = ext2fs_dirhash(hash_alg, dirent->name,
157 dirent->name_len & 0xFF,
158 fs->super->s_hash_seed,
159 &ent->hash, &ent->minor_hash);
160 if (fd->err)
161 return BLOCK_ABORT;
162 }
163 }
164
165 return 0;
166 }
167
168 /* Used for sorting the hash entry */
ino_cmp(const void * a,const void * b)169 static EXT2_QSORT_TYPE ino_cmp(const void *a, const void *b)
170 {
171 const struct hash_entry *he_a = (const struct hash_entry *) a;
172 const struct hash_entry *he_b = (const struct hash_entry *) b;
173
174 return (he_a->ino - he_b->ino);
175 }
176
177 /* Used for sorting the hash entry */
name_cmp(const void * a,const void * b)178 static EXT2_QSORT_TYPE name_cmp(const void *a, const void *b)
179 {
180 const struct hash_entry *he_a = (const struct hash_entry *) a;
181 const struct hash_entry *he_b = (const struct hash_entry *) b;
182 int ret;
183 int min_len;
184
185 min_len = he_a->dir->name_len;
186 if (min_len > he_b->dir->name_len)
187 min_len = he_b->dir->name_len;
188
189 ret = strncmp(he_a->dir->name, he_b->dir->name, min_len);
190 if (ret == 0) {
191 if (he_a->dir->name_len > he_b->dir->name_len)
192 ret = 1;
193 else if (he_a->dir->name_len < he_b->dir->name_len)
194 ret = -1;
195 else
196 ret = he_b->dir->inode - he_a->dir->inode;
197 }
198 return ret;
199 }
200
201 /* Used for sorting the hash entry */
hash_cmp(const void * a,const void * b)202 static EXT2_QSORT_TYPE hash_cmp(const void *a, const void *b)
203 {
204 const struct hash_entry *he_a = (const struct hash_entry *) a;
205 const struct hash_entry *he_b = (const struct hash_entry *) b;
206 int ret;
207
208 if (he_a->hash > he_b->hash)
209 ret = 1;
210 else if (he_a->hash < he_b->hash)
211 ret = -1;
212 else {
213 if (he_a->minor_hash > he_b->minor_hash)
214 ret = 1;
215 else if (he_a->minor_hash < he_b->minor_hash)
216 ret = -1;
217 else
218 ret = name_cmp(a, b);
219 }
220 return ret;
221 }
222
alloc_size_dir(ext2_filsys fs,struct out_dir * outdir,int blocks)223 static errcode_t alloc_size_dir(ext2_filsys fs, struct out_dir *outdir,
224 int blocks)
225 {
226 void *new_mem;
227
228 if (outdir->max) {
229 new_mem = realloc(outdir->buf, blocks * fs->blocksize);
230 if (!new_mem)
231 return ENOMEM;
232 outdir->buf = new_mem;
233 new_mem = realloc(outdir->hashes,
234 blocks * sizeof(ext2_dirhash_t));
235 if (!new_mem)
236 return ENOMEM;
237 outdir->hashes = new_mem;
238 } else {
239 outdir->buf = malloc(blocks * fs->blocksize);
240 outdir->hashes = malloc(blocks * sizeof(ext2_dirhash_t));
241 outdir->num = 0;
242 }
243 outdir->max = blocks;
244 return 0;
245 }
246
free_out_dir(struct out_dir * outdir)247 static void free_out_dir(struct out_dir *outdir)
248 {
249 free(outdir->buf);
250 free(outdir->hashes);
251 outdir->max = 0;
252 outdir->num =0;
253 }
254
get_next_block(ext2_filsys fs,struct out_dir * outdir,char ** ret)255 static errcode_t get_next_block(ext2_filsys fs, struct out_dir *outdir,
256 char ** ret)
257 {
258 errcode_t retval;
259
260 if (outdir->num >= outdir->max) {
261 retval = alloc_size_dir(fs, outdir, outdir->max + 50);
262 if (retval)
263 return retval;
264 }
265 *ret = outdir->buf + (outdir->num++ * fs->blocksize);
266 memset(*ret, 0, fs->blocksize);
267 return 0;
268 }
269
270 /*
271 * This function is used to make a unique filename. We do this by
272 * appending ~0, and then incrementing the number. However, we cannot
273 * expand the length of the filename beyond the padding available in
274 * the directory entry.
275 */
mutate_name(char * str,__u16 * len)276 static void mutate_name(char *str, __u16 *len)
277 {
278 int i;
279 __u16 l = *len & 0xFF, h = *len & 0xff00;
280
281 /*
282 * First check to see if it looks the name has been mutated
283 * already
284 */
285 for (i = l-1; i > 0; i--) {
286 if (!isdigit(str[i]))
287 break;
288 }
289 if ((i == l-1) || (str[i] != '~')) {
290 if (((l-1) & 3) < 2)
291 l += 2;
292 else
293 l = (l+3) & ~3;
294 str[l-2] = '~';
295 str[l-1] = '0';
296 *len = l | h;
297 return;
298 }
299 for (i = l-1; i >= 0; i--) {
300 if (isdigit(str[i])) {
301 if (str[i] == '9')
302 str[i] = '0';
303 else {
304 str[i]++;
305 return;
306 }
307 continue;
308 }
309 if (i == 1) {
310 if (str[0] == 'z')
311 str[0] = 'A';
312 else if (str[0] == 'Z') {
313 str[0] = '~';
314 str[1] = '0';
315 } else
316 str[0]++;
317 } else if (i > 0) {
318 str[i] = '1';
319 str[i-1] = '~';
320 } else {
321 if (str[0] == '~')
322 str[0] = 'a';
323 else
324 str[0]++;
325 }
326 break;
327 }
328 }
329
duplicate_search_and_fix(e2fsck_t ctx,ext2_filsys fs,ext2_ino_t ino,struct fill_dir_struct * fd)330 static int duplicate_search_and_fix(e2fsck_t ctx, ext2_filsys fs,
331 ext2_ino_t ino,
332 struct fill_dir_struct *fd)
333 {
334 struct problem_context pctx;
335 struct hash_entry *ent, *prev;
336 int i, j;
337 int fixed = 0;
338 char new_name[256];
339 __u16 new_len;
340 int hash_alg;
341
342 clear_problem_context(&pctx);
343 pctx.ino = ino;
344
345 hash_alg = fs->super->s_def_hash_version;
346 if ((hash_alg <= EXT2_HASH_TEA) &&
347 (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
348 hash_alg += 3;
349
350 for (i=1; i < fd->num_array; i++) {
351 ent = fd->harray + i;
352 prev = ent - 1;
353 if (!ent->dir->inode ||
354 ((ent->dir->name_len & 0xFF) !=
355 (prev->dir->name_len & 0xFF)) ||
356 (strncmp(ent->dir->name, prev->dir->name,
357 ent->dir->name_len & 0xFF)))
358 continue;
359 pctx.dirent = ent->dir;
360 if ((ent->dir->inode == prev->dir->inode) &&
361 fix_problem(ctx, PR_2_DUPLICATE_DIRENT, &pctx)) {
362 e2fsck_adjust_inode_count(ctx, ent->dir->inode, -1);
363 ent->dir->inode = 0;
364 fixed++;
365 continue;
366 }
367 memcpy(new_name, ent->dir->name, ent->dir->name_len & 0xFF);
368 new_len = ent->dir->name_len;
369 mutate_name(new_name, &new_len);
370 for (j=0; j < fd->num_array; j++) {
371 if ((i==j) ||
372 ((new_len & 0xFF) !=
373 (fd->harray[j].dir->name_len & 0xFF)) ||
374 (strncmp(new_name, fd->harray[j].dir->name,
375 new_len & 0xFF)))
376 continue;
377 mutate_name(new_name, &new_len);
378
379 j = -1;
380 }
381 new_name[new_len & 0xFF] = 0;
382 pctx.str = new_name;
383 if (fix_problem(ctx, PR_2_NON_UNIQUE_FILE, &pctx)) {
384 memcpy(ent->dir->name, new_name, new_len & 0xFF);
385 ent->dir->name_len = new_len;
386 ext2fs_dirhash(hash_alg, ent->dir->name,
387 ent->dir->name_len & 0xFF,
388 fs->super->s_hash_seed,
389 &ent->hash, &ent->minor_hash);
390 fixed++;
391 }
392 }
393 return fixed;
394 }
395
396
copy_dir_entries(e2fsck_t ctx,struct fill_dir_struct * fd,struct out_dir * outdir)397 static errcode_t copy_dir_entries(e2fsck_t ctx,
398 struct fill_dir_struct *fd,
399 struct out_dir *outdir)
400 {
401 ext2_filsys fs = ctx->fs;
402 errcode_t retval;
403 char *block_start;
404 struct hash_entry *ent;
405 struct ext2_dir_entry *dirent;
406 unsigned int rec_len, prev_rec_len, left, slack, offset;
407 int i;
408 ext2_dirhash_t prev_hash;
409
410 if (ctx->htree_slack_percentage == 255) {
411 profile_get_uint(ctx->profile, "options",
412 "indexed_dir_slack_percentage",
413 0, 20,
414 &ctx->htree_slack_percentage);
415 if (ctx->htree_slack_percentage > 100)
416 ctx->htree_slack_percentage = 20;
417 }
418
419 outdir->max = 0;
420 retval = alloc_size_dir(fs, outdir,
421 (fd->dir_size / fs->blocksize) + 2);
422 if (retval)
423 return retval;
424 outdir->num = fd->compress ? 0 : 1;
425 offset = 0;
426 outdir->hashes[0] = 0;
427 prev_hash = 1;
428 if ((retval = get_next_block(fs, outdir, &block_start)))
429 return retval;
430 dirent = (struct ext2_dir_entry *) block_start;
431 prev_rec_len = 0;
432 rec_len = 0;
433 left = fs->blocksize;
434 slack = fd->compress ? 12 :
435 (fs->blocksize * ctx->htree_slack_percentage)/100;
436 if (slack < 12)
437 slack = 12;
438 for (i = 0; i < fd->num_array; i++) {
439 ent = fd->harray + i;
440 if (ent->dir->inode == 0)
441 continue;
442 rec_len = EXT2_DIR_REC_LEN(ent->dir->name_len & 0xFF);
443 if (rec_len > left) {
444 if (left) {
445 left += prev_rec_len;
446 retval = ext2fs_set_rec_len(fs, left, dirent);
447 if (retval)
448 return retval;
449 }
450 if ((retval = get_next_block(fs, outdir,
451 &block_start)))
452 return retval;
453 offset = 0;
454 }
455 left = fs->blocksize - offset;
456 dirent = (struct ext2_dir_entry *) (block_start + offset);
457 if (offset == 0) {
458 if (ent->hash == prev_hash)
459 outdir->hashes[outdir->num-1] = ent->hash | 1;
460 else
461 outdir->hashes[outdir->num-1] = ent->hash;
462 }
463 dirent->inode = ent->dir->inode;
464 dirent->name_len = ent->dir->name_len;
465 retval = ext2fs_set_rec_len(fs, rec_len, dirent);
466 if (retval)
467 return retval;
468 prev_rec_len = rec_len;
469 memcpy(dirent->name, ent->dir->name, dirent->name_len & 0xFF);
470 offset += rec_len;
471 left -= rec_len;
472 if (left < slack) {
473 prev_rec_len += left;
474 retval = ext2fs_set_rec_len(fs, prev_rec_len, dirent);
475 if (retval)
476 return retval;
477 offset += left;
478 left = 0;
479 }
480 prev_hash = ent->hash;
481 }
482 if (left)
483 retval = ext2fs_set_rec_len(fs, rec_len + left, dirent);
484
485 return retval;
486 }
487
488
set_root_node(ext2_filsys fs,char * buf,ext2_ino_t ino,ext2_ino_t parent)489 static struct ext2_dx_root_info *set_root_node(ext2_filsys fs, char *buf,
490 ext2_ino_t ino, ext2_ino_t parent)
491 {
492 struct ext2_dir_entry *dir;
493 struct ext2_dx_root_info *root;
494 struct ext2_dx_countlimit *limits;
495 int filetype = 0;
496
497 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_FILETYPE)
498 filetype = EXT2_FT_DIR << 8;
499
500 memset(buf, 0, fs->blocksize);
501 dir = (struct ext2_dir_entry *) buf;
502 dir->inode = ino;
503 dir->name[0] = '.';
504 dir->name_len = 1 | filetype;
505 dir->rec_len = 12;
506 dir = (struct ext2_dir_entry *) (buf + 12);
507 dir->inode = parent;
508 dir->name[0] = '.';
509 dir->name[1] = '.';
510 dir->name_len = 2 | filetype;
511 dir->rec_len = fs->blocksize - 12;
512
513 root = (struct ext2_dx_root_info *) (buf+24);
514 root->reserved_zero = 0;
515 root->hash_version = fs->super->s_def_hash_version;
516 root->info_length = 8;
517 root->indirect_levels = 0;
518 root->unused_flags = 0;
519
520 limits = (struct ext2_dx_countlimit *) (buf+32);
521 limits->limit = (fs->blocksize - 32) / sizeof(struct ext2_dx_entry);
522 limits->count = 0;
523
524 return root;
525 }
526
527
set_int_node(ext2_filsys fs,char * buf)528 static struct ext2_dx_entry *set_int_node(ext2_filsys fs, char *buf)
529 {
530 struct ext2_dir_entry *dir;
531 struct ext2_dx_countlimit *limits;
532
533 memset(buf, 0, fs->blocksize);
534 dir = (struct ext2_dir_entry *) buf;
535 dir->inode = 0;
536 (void) ext2fs_set_rec_len(fs, fs->blocksize, dir);
537
538 limits = (struct ext2_dx_countlimit *) (buf+8);
539 limits->limit = (fs->blocksize - 8) / sizeof(struct ext2_dx_entry);
540 limits->count = 0;
541
542 return (struct ext2_dx_entry *) limits;
543 }
544
545 /*
546 * This function takes the leaf nodes which have been written in
547 * outdir, and populates the root node and any necessary interior nodes.
548 */
calculate_tree(ext2_filsys fs,struct out_dir * outdir,ext2_ino_t ino,ext2_ino_t parent)549 static errcode_t calculate_tree(ext2_filsys fs,
550 struct out_dir *outdir,
551 ext2_ino_t ino,
552 ext2_ino_t parent)
553 {
554 struct ext2_dx_root_info *root_info;
555 struct ext2_dx_entry *root, *dx_ent = 0;
556 struct ext2_dx_countlimit *root_limit, *limit;
557 errcode_t retval;
558 char * block_start;
559 int i, c1, c2, nblks;
560 int limit_offset, root_offset;
561
562 root_info = set_root_node(fs, outdir->buf, ino, parent);
563 root_offset = limit_offset = ((char *) root_info - outdir->buf) +
564 root_info->info_length;
565 root_limit = (struct ext2_dx_countlimit *) (outdir->buf + limit_offset);
566 c1 = root_limit->limit;
567 nblks = outdir->num;
568
569 /* Write out the pointer blocks */
570 if (nblks-1 <= c1) {
571 /* Just write out the root block, and we're done */
572 root = (struct ext2_dx_entry *) (outdir->buf + root_offset);
573 for (i=1; i < nblks; i++) {
574 root->block = ext2fs_cpu_to_le32(i);
575 if (i != 1)
576 root->hash =
577 ext2fs_cpu_to_le32(outdir->hashes[i]);
578 root++;
579 c1--;
580 }
581 } else {
582 c2 = 0;
583 limit = 0;
584 root_info->indirect_levels = 1;
585 for (i=1; i < nblks; i++) {
586 if (c1 == 0)
587 return ENOSPC;
588 if (c2 == 0) {
589 if (limit)
590 limit->limit = limit->count =
591 ext2fs_cpu_to_le16(limit->limit);
592 root = (struct ext2_dx_entry *)
593 (outdir->buf + root_offset);
594 root->block = ext2fs_cpu_to_le32(outdir->num);
595 if (i != 1)
596 root->hash =
597 ext2fs_cpu_to_le32(outdir->hashes[i]);
598 if ((retval = get_next_block(fs, outdir,
599 &block_start)))
600 return retval;
601 dx_ent = set_int_node(fs, block_start);
602 limit = (struct ext2_dx_countlimit *) dx_ent;
603 c2 = limit->limit;
604 root_offset += sizeof(struct ext2_dx_entry);
605 c1--;
606 }
607 dx_ent->block = ext2fs_cpu_to_le32(i);
608 if (c2 != limit->limit)
609 dx_ent->hash =
610 ext2fs_cpu_to_le32(outdir->hashes[i]);
611 dx_ent++;
612 c2--;
613 }
614 limit->count = ext2fs_cpu_to_le16(limit->limit - c2);
615 limit->limit = ext2fs_cpu_to_le16(limit->limit);
616 }
617 root_limit = (struct ext2_dx_countlimit *) (outdir->buf + limit_offset);
618 root_limit->count = ext2fs_cpu_to_le16(root_limit->limit - c1);
619 root_limit->limit = ext2fs_cpu_to_le16(root_limit->limit);
620
621 return 0;
622 }
623
624 struct write_dir_struct {
625 struct out_dir *outdir;
626 errcode_t err;
627 e2fsck_t ctx;
628 blk64_t cleared;
629 };
630
631 /*
632 * Helper function which writes out a directory block.
633 */
write_dir_block(ext2_filsys fs,blk64_t * block_nr,e2_blkcnt_t blockcnt,blk64_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * priv_data)634 static int write_dir_block(ext2_filsys fs,
635 blk64_t *block_nr,
636 e2_blkcnt_t blockcnt,
637 blk64_t ref_block EXT2FS_ATTR((unused)),
638 int ref_offset EXT2FS_ATTR((unused)),
639 void *priv_data)
640 {
641 struct write_dir_struct *wd = (struct write_dir_struct *) priv_data;
642 blk64_t blk;
643 char *dir;
644
645 if (*block_nr == 0)
646 return 0;
647 if (blockcnt >= wd->outdir->num) {
648 e2fsck_read_bitmaps(wd->ctx);
649 blk = *block_nr;
650 /*
651 * In theory, we only release blocks from the end of the
652 * directory file, so it's fine to clobber a whole cluster at
653 * once.
654 */
655 if (blk % EXT2FS_CLUSTER_RATIO(fs) == 0) {
656 ext2fs_unmark_block_bitmap2(wd->ctx->block_found_map,
657 blk);
658 ext2fs_block_alloc_stats2(fs, blk, -1);
659 wd->cleared++;
660 }
661 *block_nr = 0;
662 return BLOCK_CHANGED;
663 }
664 if (blockcnt < 0)
665 return 0;
666
667 dir = wd->outdir->buf + (blockcnt * fs->blocksize);
668 wd->err = ext2fs_write_dir_block3(fs, *block_nr, dir, 0);
669 if (wd->err)
670 return BLOCK_ABORT;
671 return 0;
672 }
673
write_directory(e2fsck_t ctx,ext2_filsys fs,struct out_dir * outdir,ext2_ino_t ino,int compress)674 static errcode_t write_directory(e2fsck_t ctx, ext2_filsys fs,
675 struct out_dir *outdir,
676 ext2_ino_t ino, int compress)
677 {
678 struct write_dir_struct wd;
679 errcode_t retval;
680 struct ext2_inode inode;
681
682 retval = e2fsck_expand_directory(ctx, ino, -1, outdir->num);
683 if (retval)
684 return retval;
685
686 wd.outdir = outdir;
687 wd.err = 0;
688 wd.ctx = ctx;
689 wd.cleared = 0;
690
691 retval = ext2fs_block_iterate3(fs, ino, 0, 0,
692 write_dir_block, &wd);
693 if (retval)
694 return retval;
695 if (wd.err)
696 return wd.err;
697
698 e2fsck_read_inode(ctx, ino, &inode, "rehash_dir");
699 if (compress)
700 inode.i_flags &= ~EXT2_INDEX_FL;
701 else
702 inode.i_flags |= EXT2_INDEX_FL;
703 inode.i_size = outdir->num * fs->blocksize;
704 ext2fs_iblk_sub_blocks(fs, &inode, wd.cleared);
705 e2fsck_write_inode(ctx, ino, &inode, "rehash_dir");
706
707 return 0;
708 }
709
e2fsck_rehash_dir(e2fsck_t ctx,ext2_ino_t ino)710 errcode_t e2fsck_rehash_dir(e2fsck_t ctx, ext2_ino_t ino)
711 {
712 ext2_filsys fs = ctx->fs;
713 errcode_t retval;
714 struct ext2_inode inode;
715 char *dir_buf = 0;
716 struct fill_dir_struct fd;
717 struct out_dir outdir;
718
719 outdir.max = outdir.num = 0;
720 outdir.buf = 0;
721 outdir.hashes = 0;
722 e2fsck_read_inode(ctx, ino, &inode, "rehash_dir");
723
724 retval = ENOMEM;
725 fd.harray = 0;
726 dir_buf = malloc(inode.i_size);
727 if (!dir_buf)
728 goto errout;
729
730 fd.max_array = inode.i_size / 32;
731 fd.num_array = 0;
732 fd.harray = malloc(fd.max_array * sizeof(struct hash_entry));
733 if (!fd.harray)
734 goto errout;
735
736 fd.ctx = ctx;
737 fd.buf = dir_buf;
738 fd.inode = &inode;
739 fd.err = 0;
740 fd.dir_size = 0;
741 fd.compress = 0;
742 if (!(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) ||
743 (inode.i_size / fs->blocksize) < 2)
744 fd.compress = 1;
745 fd.parent = 0;
746
747 retry_nohash:
748 /* Read in the entire directory into memory */
749 retval = ext2fs_block_iterate3(fs, ino, 0, 0,
750 fill_dir_block, &fd);
751 if (fd.err) {
752 retval = fd.err;
753 goto errout;
754 }
755
756 /*
757 * If the entries read are less than a block, then don't index
758 * the directory
759 */
760 if (!fd.compress && (fd.dir_size < (fs->blocksize - 24))) {
761 fd.compress = 1;
762 fd.dir_size = 0;
763 fd.num_array = 0;
764 goto retry_nohash;
765 }
766
767 #if 0
768 printf("%d entries (%d bytes) found in inode %d\n",
769 fd.num_array, fd.dir_size, ino);
770 #endif
771
772 /* Sort the list */
773 resort:
774 if (fd.compress)
775 qsort(fd.harray+2, fd.num_array-2, sizeof(struct hash_entry),
776 hash_cmp);
777 else
778 qsort(fd.harray, fd.num_array, sizeof(struct hash_entry),
779 hash_cmp);
780
781 /*
782 * Look for duplicates
783 */
784 if (duplicate_search_and_fix(ctx, fs, ino, &fd))
785 goto resort;
786
787 if (ctx->options & E2F_OPT_NO) {
788 retval = 0;
789 goto errout;
790 }
791
792 /* Sort non-hashed directories by inode number */
793 if (fd.compress)
794 qsort(fd.harray+2, fd.num_array-2,
795 sizeof(struct hash_entry), ino_cmp);
796
797 /*
798 * Copy the directory entries. In a htree directory these
799 * will become the leaf nodes.
800 */
801 retval = copy_dir_entries(ctx, &fd, &outdir);
802 if (retval)
803 goto errout;
804
805 free(dir_buf); dir_buf = 0;
806
807 if (!fd.compress) {
808 /* Calculate the interior nodes */
809 retval = calculate_tree(fs, &outdir, ino, fd.parent);
810 if (retval)
811 goto errout;
812 }
813
814 retval = write_directory(ctx, fs, &outdir, ino, fd.compress);
815 if (retval)
816 goto errout;
817
818 errout:
819 free(dir_buf);
820 free(fd.harray);
821
822 free_out_dir(&outdir);
823 return retval;
824 }
825
e2fsck_rehash_directories(e2fsck_t ctx)826 void e2fsck_rehash_directories(e2fsck_t ctx)
827 {
828 struct problem_context pctx;
829 #ifdef RESOURCE_TRACK
830 struct resource_track rtrack;
831 #endif
832 struct dir_info *dir;
833 ext2_u32_iterate iter;
834 struct dir_info_iter * dirinfo_iter = 0;
835 ext2_ino_t ino;
836 errcode_t retval;
837 int cur, max, all_dirs, first = 1;
838
839 init_resource_track(&rtrack, ctx->fs->io);
840 all_dirs = ctx->options & E2F_OPT_COMPRESS_DIRS;
841
842 if (!ctx->dirs_to_hash && !all_dirs)
843 return;
844
845 e2fsck_get_lost_and_found(ctx, 0);
846
847 clear_problem_context(&pctx);
848
849 cur = 0;
850 if (all_dirs) {
851 dirinfo_iter = e2fsck_dir_info_iter_begin(ctx);
852 max = e2fsck_get_num_dirinfo(ctx);
853 } else {
854 retval = ext2fs_u32_list_iterate_begin(ctx->dirs_to_hash,
855 &iter);
856 if (retval) {
857 pctx.errcode = retval;
858 fix_problem(ctx, PR_3A_OPTIMIZE_ITER, &pctx);
859 return;
860 }
861 max = ext2fs_u32_list_count(ctx->dirs_to_hash);
862 }
863 while (1) {
864 if (all_dirs) {
865 if ((dir = e2fsck_dir_info_iter(ctx,
866 dirinfo_iter)) == 0)
867 break;
868 ino = dir->ino;
869 } else {
870 if (!ext2fs_u32_list_iterate(iter, &ino))
871 break;
872 }
873 if (ino == ctx->lost_and_found)
874 continue;
875 pctx.dir = ino;
876 if (first) {
877 fix_problem(ctx, PR_3A_PASS_HEADER, &pctx);
878 first = 0;
879 }
880 #if 0
881 fix_problem(ctx, PR_3A_OPTIMIZE_DIR, &pctx);
882 #endif
883 pctx.errcode = e2fsck_rehash_dir(ctx, ino);
884 if (pctx.errcode) {
885 end_problem_latch(ctx, PR_LATCH_OPTIMIZE_DIR);
886 fix_problem(ctx, PR_3A_OPTIMIZE_DIR_ERR, &pctx);
887 }
888 if (ctx->progress && !ctx->progress_fd)
889 e2fsck_simple_progress(ctx, "Rebuilding directory",
890 100.0 * (float) (++cur) / (float) max, ino);
891 }
892 end_problem_latch(ctx, PR_LATCH_OPTIMIZE_DIR);
893 if (all_dirs)
894 e2fsck_dir_info_iter_end(ctx, dirinfo_iter);
895 else
896 ext2fs_u32_list_iterate_end(iter);
897
898 if (ctx->dirs_to_hash)
899 ext2fs_u32_list_free(ctx->dirs_to_hash);
900 ctx->dirs_to_hash = 0;
901
902 print_resource_track(ctx, "Pass 3A", &rtrack, ctx->fs->io);
903 }
904