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ext4fs: le32_to_cpu() used on a 16-bit field
[people/ms/u-boot.git] / fs / ext4 / ext4_common.c
1 /*
2 * (C) Copyright 2011 - 2012 Samsung Electronics
3 * EXT4 filesystem implementation in Uboot by
4 * Uma Shankar <uma.shankar@samsung.com>
5 * Manjunatha C Achar <a.manjunatha@samsung.com>
6 *
7 * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
8 *
9 * (C) Copyright 2004
10 * esd gmbh <www.esd-electronics.com>
11 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
12 *
13 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
14 * GRUB -- GRand Unified Bootloader
15 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
16 *
17 * ext4write : Based on generic ext4 protocol.
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 */
33
34 #include <common.h>
35 #include <ext_common.h>
36 #include <ext4fs.h>
37 #include <malloc.h>
38 #include <stddef.h>
39 #include <linux/stat.h>
40 #include <linux/time.h>
41 #include <asm/byteorder.h>
42 #include "ext4_common.h"
43
44 struct ext2_data *ext4fs_root;
45 struct ext2fs_node *ext4fs_file;
46 uint32_t *ext4fs_indir1_block;
47 int ext4fs_indir1_size;
48 int ext4fs_indir1_blkno = -1;
49 uint32_t *ext4fs_indir2_block;
50 int ext4fs_indir2_size;
51 int ext4fs_indir2_blkno = -1;
52
53 uint32_t *ext4fs_indir3_block;
54 int ext4fs_indir3_size;
55 int ext4fs_indir3_blkno = -1;
56 struct ext2_inode *g_parent_inode;
57 static int symlinknest;
58
59 #if defined(CONFIG_EXT4_WRITE)
60 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
61 {
62 uint32_t res = size / n;
63 if (res * n != size)
64 res++;
65
66 return res;
67 }
68
69 void put_ext4(uint64_t off, void *buf, uint32_t size)
70 {
71 uint64_t startblock;
72 uint64_t remainder;
73 unsigned char *temp_ptr = NULL;
74 struct ext_filesystem *fs = get_fs();
75 int log2blksz = fs->dev_desc->log2blksz;
76 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
77
78 startblock = off >> log2blksz;
79 startblock += part_offset;
80 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
81
82 if (fs->dev_desc == NULL)
83 return;
84
85 if ((startblock + (size >> log2blksz)) >
86 (part_offset + fs->total_sect)) {
87 printf("part_offset is " LBAFU "\n", part_offset);
88 printf("total_sector is %llu\n", fs->total_sect);
89 printf("error: overflow occurs\n");
90 return;
91 }
92
93 if (remainder) {
94 if (fs->dev_desc->block_read) {
95 fs->dev_desc->block_read(fs->dev_desc->dev,
96 startblock, 1, sec_buf);
97 temp_ptr = sec_buf;
98 memcpy((temp_ptr + remainder),
99 (unsigned char *)buf, size);
100 fs->dev_desc->block_write(fs->dev_desc->dev,
101 startblock, 1, sec_buf);
102 }
103 } else {
104 if (size >> log2blksz != 0) {
105 fs->dev_desc->block_write(fs->dev_desc->dev,
106 startblock,
107 size >> log2blksz,
108 (unsigned long *)buf);
109 } else {
110 fs->dev_desc->block_read(fs->dev_desc->dev,
111 startblock, 1, sec_buf);
112 temp_ptr = sec_buf;
113 memcpy(temp_ptr, buf, size);
114 fs->dev_desc->block_write(fs->dev_desc->dev,
115 startblock, 1,
116 (unsigned long *)sec_buf);
117 }
118 }
119 }
120
121 static int _get_new_inode_no(unsigned char *buffer)
122 {
123 struct ext_filesystem *fs = get_fs();
124 unsigned char input;
125 int operand, status;
126 int count = 1;
127 int j = 0;
128
129 /* get the blocksize of the filesystem */
130 unsigned char *ptr = buffer;
131 while (*ptr == 255) {
132 ptr++;
133 count += 8;
134 if (count > ext4fs_root->sblock.inodes_per_group)
135 return -1;
136 }
137
138 for (j = 0; j < fs->blksz; j++) {
139 input = *ptr;
140 int i = 0;
141 while (i <= 7) {
142 operand = 1 << i;
143 status = input & operand;
144 if (status) {
145 i++;
146 count++;
147 } else {
148 *ptr |= operand;
149 return count;
150 }
151 }
152 ptr = ptr + 1;
153 }
154
155 return -1;
156 }
157
158 static int _get_new_blk_no(unsigned char *buffer)
159 {
160 unsigned char input;
161 int operand, status;
162 int count = 0;
163 int j = 0;
164 unsigned char *ptr = buffer;
165 struct ext_filesystem *fs = get_fs();
166
167 if (fs->blksz != 1024)
168 count = 0;
169 else
170 count = 1;
171
172 while (*ptr == 255) {
173 ptr++;
174 count += 8;
175 if (count == (fs->blksz * 8))
176 return -1;
177 }
178
179 for (j = 0; j < fs->blksz; j++) {
180 input = *ptr;
181 int i = 0;
182 while (i <= 7) {
183 operand = 1 << i;
184 status = input & operand;
185 if (status) {
186 i++;
187 count++;
188 } else {
189 *ptr |= operand;
190 return count;
191 }
192 }
193 ptr = ptr + 1;
194 }
195
196 return -1;
197 }
198
199 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
200 {
201 int i, remainder, status;
202 unsigned char *ptr = buffer;
203 unsigned char operand;
204 i = blockno / 8;
205 remainder = blockno % 8;
206 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
207
208 i = i - (index * blocksize);
209 if (blocksize != 1024) {
210 ptr = ptr + i;
211 operand = 1 << remainder;
212 status = *ptr & operand;
213 if (status)
214 return -1;
215
216 *ptr = *ptr | operand;
217 return 0;
218 } else {
219 if (remainder == 0) {
220 ptr = ptr + i - 1;
221 operand = (1 << 7);
222 } else {
223 ptr = ptr + i;
224 operand = (1 << (remainder - 1));
225 }
226 status = *ptr & operand;
227 if (status)
228 return -1;
229
230 *ptr = *ptr | operand;
231 return 0;
232 }
233 }
234
235 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
236 {
237 int i, remainder, status;
238 unsigned char *ptr = buffer;
239 unsigned char operand;
240 i = blockno / 8;
241 remainder = blockno % 8;
242 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
243
244 i = i - (index * blocksize);
245 if (blocksize != 1024) {
246 ptr = ptr + i;
247 operand = (1 << remainder);
248 status = *ptr & operand;
249 if (status)
250 *ptr = *ptr & ~(operand);
251 } else {
252 if (remainder == 0) {
253 ptr = ptr + i - 1;
254 operand = (1 << 7);
255 } else {
256 ptr = ptr + i;
257 operand = (1 << (remainder - 1));
258 }
259 status = *ptr & operand;
260 if (status)
261 *ptr = *ptr & ~(operand);
262 }
263 }
264
265 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
266 {
267 int i, remainder, status;
268 unsigned char *ptr = buffer;
269 unsigned char operand;
270
271 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
272 i = inode_no / 8;
273 remainder = inode_no % 8;
274 if (remainder == 0) {
275 ptr = ptr + i - 1;
276 operand = (1 << 7);
277 } else {
278 ptr = ptr + i;
279 operand = (1 << (remainder - 1));
280 }
281 status = *ptr & operand;
282 if (status)
283 return -1;
284
285 *ptr = *ptr | operand;
286
287 return 0;
288 }
289
290 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
291 {
292 int i, remainder, status;
293 unsigned char *ptr = buffer;
294 unsigned char operand;
295
296 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
297 i = inode_no / 8;
298 remainder = inode_no % 8;
299 if (remainder == 0) {
300 ptr = ptr + i - 1;
301 operand = (1 << 7);
302 } else {
303 ptr = ptr + i;
304 operand = (1 << (remainder - 1));
305 }
306 status = *ptr & operand;
307 if (status)
308 *ptr = *ptr & ~(operand);
309 }
310
311 int ext4fs_checksum_update(unsigned int i)
312 {
313 struct ext2_block_group *desc;
314 struct ext_filesystem *fs = get_fs();
315 __u16 crc = 0;
316
317 desc = (struct ext2_block_group *)&fs->bgd[i];
318 if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
319 int offset = offsetof(struct ext2_block_group, bg_checksum);
320
321 crc = ext2fs_crc16(~0, fs->sb->unique_id,
322 sizeof(fs->sb->unique_id));
323 crc = ext2fs_crc16(crc, &i, sizeof(i));
324 crc = ext2fs_crc16(crc, desc, offset);
325 offset += sizeof(desc->bg_checksum); /* skip checksum */
326 assert(offset == sizeof(*desc));
327 }
328
329 return crc;
330 }
331
332 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
333 {
334 int dentry_length;
335 int sizeof_void_space;
336 int new_entry_byte_reqd;
337 short padding_factor = 0;
338
339 if (dir->namelen % 4 != 0)
340 padding_factor = 4 - (dir->namelen % 4);
341
342 dentry_length = sizeof(struct ext2_dirent) +
343 dir->namelen + padding_factor;
344 sizeof_void_space = dir->direntlen - dentry_length;
345 if (sizeof_void_space == 0)
346 return 0;
347
348 padding_factor = 0;
349 if (strlen(filename) % 4 != 0)
350 padding_factor = 4 - (strlen(filename) % 4);
351
352 new_entry_byte_reqd = strlen(filename) +
353 sizeof(struct ext2_dirent) + padding_factor;
354 if (sizeof_void_space >= new_entry_byte_reqd) {
355 dir->direntlen = dentry_length;
356 return sizeof_void_space;
357 }
358
359 return 0;
360 }
361
362 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
363 {
364 unsigned int *zero_buffer = NULL;
365 char *root_first_block_buffer = NULL;
366 int direct_blk_idx;
367 long int root_blknr;
368 long int first_block_no_of_root = 0;
369 long int previous_blknr = -1;
370 int totalbytes = 0;
371 short int padding_factor = 0;
372 unsigned int new_entry_byte_reqd;
373 unsigned int last_entry_dirlen;
374 int sizeof_void_space = 0;
375 int templength = 0;
376 int inodeno;
377 int status;
378 struct ext_filesystem *fs = get_fs();
379 /* directory entry */
380 struct ext2_dirent *dir;
381 char *temp_dir = NULL;
382
383 zero_buffer = zalloc(fs->blksz);
384 if (!zero_buffer) {
385 printf("No Memory\n");
386 return;
387 }
388 root_first_block_buffer = zalloc(fs->blksz);
389 if (!root_first_block_buffer) {
390 free(zero_buffer);
391 printf("No Memory\n");
392 return;
393 }
394 restart:
395
396 /* read the block no allocated to a file */
397 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
398 direct_blk_idx++) {
399 root_blknr = read_allocated_block(g_parent_inode,
400 direct_blk_idx);
401 if (root_blknr == 0) {
402 first_block_no_of_root = previous_blknr;
403 break;
404 }
405 previous_blknr = root_blknr;
406 }
407
408 status = ext4fs_devread((lbaint_t)first_block_no_of_root
409 * fs->sect_perblk,
410 0, fs->blksz, root_first_block_buffer);
411 if (status == 0)
412 goto fail;
413
414 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
415 goto fail;
416 dir = (struct ext2_dirent *)root_first_block_buffer;
417 totalbytes = 0;
418 while (dir->direntlen > 0) {
419 /*
420 * blocksize-totalbytes because last directory length
421 * i.e. dir->direntlen is free availble space in the
422 * block that means it is a last entry of directory
423 * entry
424 */
425
426 /* traversing the each directory entry */
427 if (fs->blksz - totalbytes == dir->direntlen) {
428 if (strlen(filename) % 4 != 0)
429 padding_factor = 4 - (strlen(filename) % 4);
430
431 new_entry_byte_reqd = strlen(filename) +
432 sizeof(struct ext2_dirent) + padding_factor;
433 padding_factor = 0;
434 /*
435 * update last directory entry length to its
436 * length because we are creating new directory
437 * entry
438 */
439 if (dir->namelen % 4 != 0)
440 padding_factor = 4 - (dir->namelen % 4);
441
442 last_entry_dirlen = dir->namelen +
443 sizeof(struct ext2_dirent) + padding_factor;
444 if ((fs->blksz - totalbytes - last_entry_dirlen) <
445 new_entry_byte_reqd) {
446 printf("1st Block Full:Allocate new block\n");
447
448 if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
449 printf("Directory exceeds limit\n");
450 goto fail;
451 }
452 g_parent_inode->b.blocks.dir_blocks
453 [direct_blk_idx] = ext4fs_get_new_blk_no();
454 if (g_parent_inode->b.blocks.dir_blocks
455 [direct_blk_idx] == -1) {
456 printf("no block left to assign\n");
457 goto fail;
458 }
459 put_ext4(((uint64_t)
460 (g_parent_inode->b.
461 blocks.dir_blocks[direct_blk_idx] *
462 fs->blksz)), zero_buffer, fs->blksz);
463 g_parent_inode->size =
464 g_parent_inode->size + fs->blksz;
465 g_parent_inode->blockcnt =
466 g_parent_inode->blockcnt + fs->sect_perblk;
467 if (ext4fs_put_metadata
468 (root_first_block_buffer,
469 first_block_no_of_root))
470 goto fail;
471 goto restart;
472 }
473 dir->direntlen = last_entry_dirlen;
474 break;
475 }
476
477 templength = dir->direntlen;
478 totalbytes = totalbytes + templength;
479 sizeof_void_space = check_void_in_dentry(dir, filename);
480 if (sizeof_void_space)
481 break;
482
483 dir = (struct ext2_dirent *)((char *)dir + templength);
484 }
485
486 /* make a pointer ready for creating next directory entry */
487 templength = dir->direntlen;
488 totalbytes = totalbytes + templength;
489 dir = (struct ext2_dirent *)((char *)dir + templength);
490
491 /* get the next available inode number */
492 inodeno = ext4fs_get_new_inode_no();
493 if (inodeno == -1) {
494 printf("no inode left to assign\n");
495 goto fail;
496 }
497 dir->inode = inodeno;
498 if (sizeof_void_space)
499 dir->direntlen = sizeof_void_space;
500 else
501 dir->direntlen = fs->blksz - totalbytes;
502
503 dir->namelen = strlen(filename);
504 dir->filetype = FILETYPE_REG; /* regular file */
505 temp_dir = (char *)dir;
506 temp_dir = temp_dir + sizeof(struct ext2_dirent);
507 memcpy(temp_dir, filename, strlen(filename));
508
509 *p_ino = inodeno;
510
511 /* update or write the 1st block of root inode */
512 if (ext4fs_put_metadata(root_first_block_buffer,
513 first_block_no_of_root))
514 goto fail;
515
516 fail:
517 free(zero_buffer);
518 free(root_first_block_buffer);
519 }
520
521 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
522 {
523 int status;
524 int inodeno;
525 int totalbytes;
526 int templength;
527 int direct_blk_idx;
528 long int blknr;
529 int found = 0;
530 char *ptr = NULL;
531 unsigned char *block_buffer = NULL;
532 struct ext2_dirent *dir = NULL;
533 struct ext2_dirent *previous_dir = NULL;
534 struct ext_filesystem *fs = get_fs();
535
536 /* read the block no allocated to a file */
537 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
538 direct_blk_idx++) {
539 blknr = read_allocated_block(parent_inode, direct_blk_idx);
540 if (blknr == 0)
541 goto fail;
542
543 /* read the blocks of parenet inode */
544 block_buffer = zalloc(fs->blksz);
545 if (!block_buffer)
546 goto fail;
547
548 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
549 0, fs->blksz, (char *)block_buffer);
550 if (status == 0)
551 goto fail;
552
553 dir = (struct ext2_dirent *)block_buffer;
554 ptr = (char *)dir;
555 totalbytes = 0;
556 while (dir->direntlen >= 0) {
557 /*
558 * blocksize-totalbytes because last directory
559 * length i.e.,*dir->direntlen is free availble
560 * space in the block that means
561 * it is a last entry of directory entry
562 */
563 if (strlen(dirname) == dir->namelen) {
564 if (strncmp(dirname, ptr +
565 sizeof(struct ext2_dirent),
566 dir->namelen) == 0) {
567 previous_dir->direntlen +=
568 dir->direntlen;
569 inodeno = dir->inode;
570 dir->inode = 0;
571 found = 1;
572 break;
573 }
574 }
575
576 if (fs->blksz - totalbytes == dir->direntlen)
577 break;
578
579 /* traversing the each directory entry */
580 templength = dir->direntlen;
581 totalbytes = totalbytes + templength;
582 previous_dir = dir;
583 dir = (struct ext2_dirent *)((char *)dir + templength);
584 ptr = (char *)dir;
585 }
586
587 if (found == 1) {
588 free(block_buffer);
589 block_buffer = NULL;
590 return inodeno;
591 }
592
593 free(block_buffer);
594 block_buffer = NULL;
595 }
596
597 fail:
598 free(block_buffer);
599
600 return -1;
601 }
602
603 static int find_dir_depth(char *dirname)
604 {
605 char *token = strtok(dirname, "/");
606 int count = 0;
607 while (token != NULL) {
608 token = strtok(NULL, "/");
609 count++;
610 }
611 return count + 1 + 1;
612 /*
613 * for example for string /home/temp
614 * depth=home(1)+temp(1)+1 extra for NULL;
615 * so count is 4;
616 */
617 }
618
619 static int parse_path(char **arr, char *dirname)
620 {
621 char *token = strtok(dirname, "/");
622 int i = 0;
623
624 /* add root */
625 arr[i] = zalloc(strlen("/") + 1);
626 if (!arr[i])
627 return -ENOMEM;
628
629 arr[i++] = "/";
630
631 /* add each path entry after root */
632 while (token != NULL) {
633 arr[i] = zalloc(strlen(token) + 1);
634 if (!arr[i])
635 return -ENOMEM;
636 memcpy(arr[i++], token, strlen(token));
637 token = strtok(NULL, "/");
638 }
639 arr[i] = NULL;
640
641 return 0;
642 }
643
644 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
645 {
646 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
647 return -1;
648
649 return 0;
650 }
651
652 /*
653 * Function: ext4fs_get_parent_inode_num
654 * Return Value: inode Number of the parent directory of file/Directory to be
655 * created
656 * dirname : Input parmater, input path name of the file/directory to be created
657 * dname : Output parameter, to be filled with the name of the directory
658 * extracted from dirname
659 */
660 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
661 {
662 int i;
663 int depth = 0;
664 int matched_inode_no;
665 int result_inode_no = -1;
666 char **ptr = NULL;
667 char *depth_dirname = NULL;
668 char *parse_dirname = NULL;
669 struct ext2_inode *parent_inode = NULL;
670 struct ext2_inode *first_inode = NULL;
671 struct ext2_inode temp_inode;
672
673 if (*dirname != '/') {
674 printf("Please supply Absolute path\n");
675 return -1;
676 }
677
678 /* TODO: input validation make equivalent to linux */
679 depth_dirname = zalloc(strlen(dirname) + 1);
680 if (!depth_dirname)
681 return -ENOMEM;
682
683 memcpy(depth_dirname, dirname, strlen(dirname));
684 depth = find_dir_depth(depth_dirname);
685 parse_dirname = zalloc(strlen(dirname) + 1);
686 if (!parse_dirname)
687 goto fail;
688 memcpy(parse_dirname, dirname, strlen(dirname));
689
690 /* allocate memory for each directory level */
691 ptr = zalloc((depth) * sizeof(char *));
692 if (!ptr)
693 goto fail;
694 if (parse_path(ptr, parse_dirname))
695 goto fail;
696 parent_inode = zalloc(sizeof(struct ext2_inode));
697 if (!parent_inode)
698 goto fail;
699 first_inode = zalloc(sizeof(struct ext2_inode));
700 if (!first_inode)
701 goto fail;
702 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
703 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
704 if (flags & F_FILE)
705 result_inode_no = EXT2_ROOT_INO;
706 for (i = 1; i < depth; i++) {
707 matched_inode_no = search_dir(parent_inode, ptr[i]);
708 if (matched_inode_no == -1) {
709 if (ptr[i + 1] == NULL && i == 1) {
710 result_inode_no = EXT2_ROOT_INO;
711 goto end;
712 } else {
713 if (ptr[i + 1] == NULL)
714 break;
715 printf("Invalid path\n");
716 result_inode_no = -1;
717 goto fail;
718 }
719 } else {
720 if (ptr[i + 1] != NULL) {
721 memset(parent_inode, '\0',
722 sizeof(struct ext2_inode));
723 if (ext4fs_iget(matched_inode_no,
724 parent_inode)) {
725 result_inode_no = -1;
726 goto fail;
727 }
728 result_inode_no = matched_inode_no;
729 } else {
730 break;
731 }
732 }
733 }
734
735 end:
736 if (i == 1)
737 matched_inode_no = search_dir(first_inode, ptr[i]);
738 else
739 matched_inode_no = search_dir(parent_inode, ptr[i]);
740
741 if (matched_inode_no != -1) {
742 ext4fs_iget(matched_inode_no, &temp_inode);
743 if (temp_inode.mode & S_IFDIR) {
744 printf("It is a Directory\n");
745 result_inode_no = -1;
746 goto fail;
747 }
748 }
749
750 if (strlen(ptr[i]) > 256) {
751 result_inode_no = -1;
752 goto fail;
753 }
754 memcpy(dname, ptr[i], strlen(ptr[i]));
755
756 fail:
757 free(depth_dirname);
758 free(parse_dirname);
759 free(ptr);
760 free(parent_inode);
761 free(first_inode);
762
763 return result_inode_no;
764 }
765
766 static int check_filename(char *filename, unsigned int blknr)
767 {
768 unsigned int first_block_no_of_root;
769 int totalbytes = 0;
770 int templength = 0;
771 int status, inodeno;
772 int found = 0;
773 char *root_first_block_buffer = NULL;
774 char *root_first_block_addr = NULL;
775 struct ext2_dirent *dir = NULL;
776 struct ext2_dirent *previous_dir = NULL;
777 char *ptr = NULL;
778 struct ext_filesystem *fs = get_fs();
779
780 /* get the first block of root */
781 first_block_no_of_root = blknr;
782 root_first_block_buffer = zalloc(fs->blksz);
783 if (!root_first_block_buffer)
784 return -ENOMEM;
785 root_first_block_addr = root_first_block_buffer;
786 status = ext4fs_devread((lbaint_t)first_block_no_of_root *
787 fs->sect_perblk, 0,
788 fs->blksz, root_first_block_buffer);
789 if (status == 0)
790 goto fail;
791
792 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
793 goto fail;
794 dir = (struct ext2_dirent *)root_first_block_buffer;
795 ptr = (char *)dir;
796 totalbytes = 0;
797 while (dir->direntlen >= 0) {
798 /*
799 * blocksize-totalbytes because last
800 * directory length i.e., *dir->direntlen
801 * is free availble space in the block that
802 * means it is a last entry of directory entry
803 */
804 if (strlen(filename) == dir->namelen) {
805 if (strncmp(filename, ptr + sizeof(struct ext2_dirent),
806 dir->namelen) == 0) {
807 printf("file found deleting\n");
808 previous_dir->direntlen += dir->direntlen;
809 inodeno = dir->inode;
810 dir->inode = 0;
811 found = 1;
812 break;
813 }
814 }
815
816 if (fs->blksz - totalbytes == dir->direntlen)
817 break;
818
819 /* traversing the each directory entry */
820 templength = dir->direntlen;
821 totalbytes = totalbytes + templength;
822 previous_dir = dir;
823 dir = (struct ext2_dirent *)((char *)dir + templength);
824 ptr = (char *)dir;
825 }
826
827
828 if (found == 1) {
829 if (ext4fs_put_metadata(root_first_block_addr,
830 first_block_no_of_root))
831 goto fail;
832 return inodeno;
833 }
834 fail:
835 free(root_first_block_buffer);
836
837 return -1;
838 }
839
840 int ext4fs_filename_check(char *filename)
841 {
842 short direct_blk_idx = 0;
843 long int blknr = -1;
844 int inodeno = -1;
845
846 /* read the block no allocated to a file */
847 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
848 direct_blk_idx++) {
849 blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
850 if (blknr == 0)
851 break;
852 inodeno = check_filename(filename, blknr);
853 if (inodeno != -1)
854 return inodeno;
855 }
856
857 return -1;
858 }
859
860 long int ext4fs_get_new_blk_no(void)
861 {
862 short i;
863 short status;
864 int remainder;
865 unsigned int bg_idx;
866 static int prev_bg_bitmap_index = -1;
867 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
868 struct ext_filesystem *fs = get_fs();
869 char *journal_buffer = zalloc(fs->blksz);
870 char *zero_buffer = zalloc(fs->blksz);
871 if (!journal_buffer || !zero_buffer)
872 goto fail;
873 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
874
875 if (fs->first_pass_bbmap == 0) {
876 for (i = 0; i < fs->no_blkgrp; i++) {
877 if (bgd[i].free_blocks) {
878 if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) {
879 put_ext4(((uint64_t) (bgd[i].block_id *
880 fs->blksz)),
881 zero_buffer, fs->blksz);
882 bgd[i].bg_flags =
883 bgd[i].
884 bg_flags & ~EXT4_BG_BLOCK_UNINIT;
885 memcpy(fs->blk_bmaps[i], zero_buffer,
886 fs->blksz);
887 }
888 fs->curr_blkno =
889 _get_new_blk_no(fs->blk_bmaps[i]);
890 if (fs->curr_blkno == -1)
891 /* if block bitmap is completely fill */
892 continue;
893 fs->curr_blkno = fs->curr_blkno +
894 (i * fs->blksz * 8);
895 fs->first_pass_bbmap++;
896 bgd[i].free_blocks--;
897 fs->sb->free_blocks--;
898 status = ext4fs_devread((lbaint_t)
899 bgd[i].block_id *
900 fs->sect_perblk, 0,
901 fs->blksz,
902 journal_buffer);
903 if (status == 0)
904 goto fail;
905 if (ext4fs_log_journal(journal_buffer,
906 bgd[i].block_id))
907 goto fail;
908 goto success;
909 } else {
910 debug("no space left on block group %d\n", i);
911 }
912 }
913
914 goto fail;
915 } else {
916 restart:
917 fs->curr_blkno++;
918 /* get the blockbitmap index respective to blockno */
919 if (fs->blksz != 1024) {
920 bg_idx = fs->curr_blkno / blk_per_grp;
921 } else {
922 bg_idx = fs->curr_blkno / blk_per_grp;
923 remainder = fs->curr_blkno % blk_per_grp;
924 if (!remainder)
925 bg_idx--;
926 }
927
928 /*
929 * To skip completely filled block group bitmaps
930 * Optimize the block allocation
931 */
932 if (bg_idx >= fs->no_blkgrp)
933 goto fail;
934
935 if (bgd[bg_idx].free_blocks == 0) {
936 debug("block group %u is full. Skipping\n", bg_idx);
937 fs->curr_blkno = fs->curr_blkno + blk_per_grp;
938 fs->curr_blkno--;
939 goto restart;
940 }
941
942 if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
943 memset(zero_buffer, '\0', fs->blksz);
944 put_ext4(((uint64_t) (bgd[bg_idx].block_id *
945 fs->blksz)), zero_buffer, fs->blksz);
946 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
947 bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags &
948 ~EXT4_BG_BLOCK_UNINIT;
949 }
950
951 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
952 bg_idx) != 0) {
953 debug("going for restart for the block no %ld %u\n",
954 fs->curr_blkno, bg_idx);
955 goto restart;
956 }
957
958 /* journal backup */
959 if (prev_bg_bitmap_index != bg_idx) {
960 memset(journal_buffer, '\0', fs->blksz);
961 status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id
962 * fs->sect_perblk,
963 0, fs->blksz, journal_buffer);
964 if (status == 0)
965 goto fail;
966 if (ext4fs_log_journal(journal_buffer,
967 bgd[bg_idx].block_id))
968 goto fail;
969
970 prev_bg_bitmap_index = bg_idx;
971 }
972 bgd[bg_idx].free_blocks--;
973 fs->sb->free_blocks--;
974 goto success;
975 }
976 success:
977 free(journal_buffer);
978 free(zero_buffer);
979
980 return fs->curr_blkno;
981 fail:
982 free(journal_buffer);
983 free(zero_buffer);
984
985 return -1;
986 }
987
988 int ext4fs_get_new_inode_no(void)
989 {
990 short i;
991 short status;
992 unsigned int ibmap_idx;
993 static int prev_inode_bitmap_index = -1;
994 unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
995 struct ext_filesystem *fs = get_fs();
996 char *journal_buffer = zalloc(fs->blksz);
997 char *zero_buffer = zalloc(fs->blksz);
998 if (!journal_buffer || !zero_buffer)
999 goto fail;
1000 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
1001
1002 if (fs->first_pass_ibmap == 0) {
1003 for (i = 0; i < fs->no_blkgrp; i++) {
1004 if (bgd[i].free_inodes) {
1005 if (bgd[i].bg_itable_unused !=
1006 bgd[i].free_inodes)
1007 bgd[i].bg_itable_unused =
1008 bgd[i].free_inodes;
1009 if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
1010 put_ext4(((uint64_t)
1011 (bgd[i].inode_id *
1012 fs->blksz)),
1013 zero_buffer, fs->blksz);
1014 bgd[i].bg_flags = bgd[i].bg_flags &
1015 ~EXT4_BG_INODE_UNINIT;
1016 memcpy(fs->inode_bmaps[i],
1017 zero_buffer, fs->blksz);
1018 }
1019 fs->curr_inode_no =
1020 _get_new_inode_no(fs->inode_bmaps[i]);
1021 if (fs->curr_inode_no == -1)
1022 /* if block bitmap is completely fill */
1023 continue;
1024 fs->curr_inode_no = fs->curr_inode_no +
1025 (i * inodes_per_grp);
1026 fs->first_pass_ibmap++;
1027 bgd[i].free_inodes--;
1028 bgd[i].bg_itable_unused--;
1029 fs->sb->free_inodes--;
1030 status = ext4fs_devread((lbaint_t)
1031 bgd[i].inode_id *
1032 fs->sect_perblk, 0,
1033 fs->blksz,
1034 journal_buffer);
1035 if (status == 0)
1036 goto fail;
1037 if (ext4fs_log_journal(journal_buffer,
1038 bgd[i].inode_id))
1039 goto fail;
1040 goto success;
1041 } else
1042 debug("no inode left on block group %d\n", i);
1043 }
1044 goto fail;
1045 } else {
1046 restart:
1047 fs->curr_inode_no++;
1048 /* get the blockbitmap index respective to blockno */
1049 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1050 if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
1051 memset(zero_buffer, '\0', fs->blksz);
1052 put_ext4(((uint64_t) (bgd[ibmap_idx].inode_id *
1053 fs->blksz)), zero_buffer,
1054 fs->blksz);
1055 bgd[ibmap_idx].bg_flags =
1056 bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
1057 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1058 fs->blksz);
1059 }
1060
1061 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1062 fs->inode_bmaps[ibmap_idx],
1063 ibmap_idx) != 0) {
1064 debug("going for restart for the block no %d %u\n",
1065 fs->curr_inode_no, ibmap_idx);
1066 goto restart;
1067 }
1068
1069 /* journal backup */
1070 if (prev_inode_bitmap_index != ibmap_idx) {
1071 memset(journal_buffer, '\0', fs->blksz);
1072 status = ext4fs_devread((lbaint_t)
1073 bgd[ibmap_idx].inode_id
1074 * fs->sect_perblk,
1075 0, fs->blksz, journal_buffer);
1076 if (status == 0)
1077 goto fail;
1078 if (ext4fs_log_journal(journal_buffer,
1079 bgd[ibmap_idx].inode_id))
1080 goto fail;
1081 prev_inode_bitmap_index = ibmap_idx;
1082 }
1083 if (bgd[ibmap_idx].bg_itable_unused !=
1084 bgd[ibmap_idx].free_inodes)
1085 bgd[ibmap_idx].bg_itable_unused =
1086 bgd[ibmap_idx].free_inodes;
1087 bgd[ibmap_idx].free_inodes--;
1088 bgd[ibmap_idx].bg_itable_unused--;
1089 fs->sb->free_inodes--;
1090 goto success;
1091 }
1092
1093 success:
1094 free(journal_buffer);
1095 free(zero_buffer);
1096
1097 return fs->curr_inode_no;
1098 fail:
1099 free(journal_buffer);
1100 free(zero_buffer);
1101
1102 return -1;
1103
1104 }
1105
1106
1107 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1108 unsigned int *total_remaining_blocks,
1109 unsigned int *no_blks_reqd)
1110 {
1111 short i;
1112 short status;
1113 long int actual_block_no;
1114 long int si_blockno;
1115 /* si :single indirect */
1116 unsigned int *si_buffer = NULL;
1117 unsigned int *si_start_addr = NULL;
1118 struct ext_filesystem *fs = get_fs();
1119
1120 if (*total_remaining_blocks != 0) {
1121 si_buffer = zalloc(fs->blksz);
1122 if (!si_buffer) {
1123 printf("No Memory\n");
1124 return;
1125 }
1126 si_start_addr = si_buffer;
1127 si_blockno = ext4fs_get_new_blk_no();
1128 if (si_blockno == -1) {
1129 printf("no block left to assign\n");
1130 goto fail;
1131 }
1132 (*no_blks_reqd)++;
1133 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1134
1135 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1136 0, fs->blksz, (char *)si_buffer);
1137 memset(si_buffer, '\0', fs->blksz);
1138 if (status == 0)
1139 goto fail;
1140
1141 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1142 actual_block_no = ext4fs_get_new_blk_no();
1143 if (actual_block_no == -1) {
1144 printf("no block left to assign\n");
1145 goto fail;
1146 }
1147 *si_buffer = actual_block_no;
1148 debug("SIAB %u: %u\n", *si_buffer,
1149 *total_remaining_blocks);
1150
1151 si_buffer++;
1152 (*total_remaining_blocks)--;
1153 if (*total_remaining_blocks == 0)
1154 break;
1155 }
1156
1157 /* write the block to disk */
1158 put_ext4(((uint64_t) (si_blockno * fs->blksz)),
1159 si_start_addr, fs->blksz);
1160 file_inode->b.blocks.indir_block = si_blockno;
1161 }
1162 fail:
1163 free(si_start_addr);
1164 }
1165
1166 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1167 unsigned int *total_remaining_blocks,
1168 unsigned int *no_blks_reqd)
1169 {
1170 short i;
1171 short j;
1172 short status;
1173 long int actual_block_no;
1174 /* di:double indirect */
1175 long int di_blockno_parent;
1176 long int di_blockno_child;
1177 unsigned int *di_parent_buffer = NULL;
1178 unsigned int *di_child_buff = NULL;
1179 unsigned int *di_block_start_addr = NULL;
1180 unsigned int *di_child_buff_start = NULL;
1181 struct ext_filesystem *fs = get_fs();
1182
1183 if (*total_remaining_blocks != 0) {
1184 /* double indirect parent block connecting to inode */
1185 di_blockno_parent = ext4fs_get_new_blk_no();
1186 if (di_blockno_parent == -1) {
1187 printf("no block left to assign\n");
1188 goto fail;
1189 }
1190 di_parent_buffer = zalloc(fs->blksz);
1191 if (!di_parent_buffer)
1192 goto fail;
1193
1194 di_block_start_addr = di_parent_buffer;
1195 (*no_blks_reqd)++;
1196 debug("DIPB %ld: %u\n", di_blockno_parent,
1197 *total_remaining_blocks);
1198
1199 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1200 fs->sect_perblk, 0,
1201 fs->blksz, (char *)di_parent_buffer);
1202
1203 if (!status) {
1204 printf("%s: Device read error!\n", __func__);
1205 goto fail;
1206 }
1207 memset(di_parent_buffer, '\0', fs->blksz);
1208
1209 /*
1210 * start:for each double indirect parent
1211 * block create one more block
1212 */
1213 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1214 di_blockno_child = ext4fs_get_new_blk_no();
1215 if (di_blockno_child == -1) {
1216 printf("no block left to assign\n");
1217 goto fail;
1218 }
1219 di_child_buff = zalloc(fs->blksz);
1220 if (!di_child_buff)
1221 goto fail;
1222
1223 di_child_buff_start = di_child_buff;
1224 *di_parent_buffer = di_blockno_child;
1225 di_parent_buffer++;
1226 (*no_blks_reqd)++;
1227 debug("DICB %ld: %u\n", di_blockno_child,
1228 *total_remaining_blocks);
1229
1230 status = ext4fs_devread((lbaint_t)di_blockno_child *
1231 fs->sect_perblk, 0,
1232 fs->blksz,
1233 (char *)di_child_buff);
1234
1235 if (!status) {
1236 printf("%s: Device read error!\n", __func__);
1237 goto fail;
1238 }
1239 memset(di_child_buff, '\0', fs->blksz);
1240 /* filling of actual datablocks for each child */
1241 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1242 actual_block_no = ext4fs_get_new_blk_no();
1243 if (actual_block_no == -1) {
1244 printf("no block left to assign\n");
1245 goto fail;
1246 }
1247 *di_child_buff = actual_block_no;
1248 debug("DIAB %ld: %u\n", actual_block_no,
1249 *total_remaining_blocks);
1250
1251 di_child_buff++;
1252 (*total_remaining_blocks)--;
1253 if (*total_remaining_blocks == 0)
1254 break;
1255 }
1256 /* write the block table */
1257 put_ext4(((uint64_t) (di_blockno_child * fs->blksz)),
1258 di_child_buff_start, fs->blksz);
1259 free(di_child_buff_start);
1260 di_child_buff_start = NULL;
1261
1262 if (*total_remaining_blocks == 0)
1263 break;
1264 }
1265 put_ext4(((uint64_t) (di_blockno_parent * fs->blksz)),
1266 di_block_start_addr, fs->blksz);
1267 file_inode->b.blocks.double_indir_block = di_blockno_parent;
1268 }
1269 fail:
1270 free(di_block_start_addr);
1271 }
1272
1273 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1274 unsigned int *total_remaining_blocks,
1275 unsigned int *no_blks_reqd)
1276 {
1277 short i;
1278 short j;
1279 short k;
1280 long int actual_block_no;
1281 /* ti: Triple Indirect */
1282 long int ti_gp_blockno;
1283 long int ti_parent_blockno;
1284 long int ti_child_blockno;
1285 unsigned int *ti_gp_buff = NULL;
1286 unsigned int *ti_parent_buff = NULL;
1287 unsigned int *ti_child_buff = NULL;
1288 unsigned int *ti_gp_buff_start_addr = NULL;
1289 unsigned int *ti_pbuff_start_addr = NULL;
1290 unsigned int *ti_cbuff_start_addr = NULL;
1291 struct ext_filesystem *fs = get_fs();
1292 if (*total_remaining_blocks != 0) {
1293 /* triple indirect grand parent block connecting to inode */
1294 ti_gp_blockno = ext4fs_get_new_blk_no();
1295 if (ti_gp_blockno == -1) {
1296 printf("no block left to assign\n");
1297 goto fail;
1298 }
1299 ti_gp_buff = zalloc(fs->blksz);
1300 if (!ti_gp_buff)
1301 goto fail;
1302
1303 ti_gp_buff_start_addr = ti_gp_buff;
1304 (*no_blks_reqd)++;
1305 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1306 *total_remaining_blocks);
1307
1308 /* for each 4 byte grand parent entry create one more block */
1309 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1310 ti_parent_blockno = ext4fs_get_new_blk_no();
1311 if (ti_parent_blockno == -1) {
1312 printf("no block left to assign\n");
1313 goto fail;
1314 }
1315 ti_parent_buff = zalloc(fs->blksz);
1316 if (!ti_parent_buff)
1317 goto fail;
1318
1319 ti_pbuff_start_addr = ti_parent_buff;
1320 *ti_gp_buff = ti_parent_blockno;
1321 ti_gp_buff++;
1322 (*no_blks_reqd)++;
1323 debug("TIPB %ld: %u\n", ti_parent_blockno,
1324 *total_remaining_blocks);
1325
1326 /* for each 4 byte entry parent create one more block */
1327 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1328 ti_child_blockno = ext4fs_get_new_blk_no();
1329 if (ti_child_blockno == -1) {
1330 printf("no block left assign\n");
1331 goto fail;
1332 }
1333 ti_child_buff = zalloc(fs->blksz);
1334 if (!ti_child_buff)
1335 goto fail;
1336
1337 ti_cbuff_start_addr = ti_child_buff;
1338 *ti_parent_buff = ti_child_blockno;
1339 ti_parent_buff++;
1340 (*no_blks_reqd)++;
1341 debug("TICB %ld: %u\n", ti_parent_blockno,
1342 *total_remaining_blocks);
1343
1344 /* fill actual datablocks for each child */
1345 for (k = 0; k < (fs->blksz / sizeof(int));
1346 k++) {
1347 actual_block_no =
1348 ext4fs_get_new_blk_no();
1349 if (actual_block_no == -1) {
1350 printf("no block left\n");
1351 goto fail;
1352 }
1353 *ti_child_buff = actual_block_no;
1354 debug("TIAB %ld: %u\n", actual_block_no,
1355 *total_remaining_blocks);
1356
1357 ti_child_buff++;
1358 (*total_remaining_blocks)--;
1359 if (*total_remaining_blocks == 0)
1360 break;
1361 }
1362 /* write the child block */
1363 put_ext4(((uint64_t) (ti_child_blockno *
1364 fs->blksz)),
1365 ti_cbuff_start_addr, fs->blksz);
1366 free(ti_cbuff_start_addr);
1367
1368 if (*total_remaining_blocks == 0)
1369 break;
1370 }
1371 /* write the parent block */
1372 put_ext4(((uint64_t) (ti_parent_blockno * fs->blksz)),
1373 ti_pbuff_start_addr, fs->blksz);
1374 free(ti_pbuff_start_addr);
1375
1376 if (*total_remaining_blocks == 0)
1377 break;
1378 }
1379 /* write the grand parent block */
1380 put_ext4(((uint64_t) (ti_gp_blockno * fs->blksz)),
1381 ti_gp_buff_start_addr, fs->blksz);
1382 file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
1383 }
1384 fail:
1385 free(ti_gp_buff_start_addr);
1386 }
1387
1388 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1389 unsigned int total_remaining_blocks,
1390 unsigned int *total_no_of_block)
1391 {
1392 short i;
1393 long int direct_blockno;
1394 unsigned int no_blks_reqd = 0;
1395
1396 /* allocation of direct blocks */
1397 for (i = 0; i < INDIRECT_BLOCKS; i++) {
1398 direct_blockno = ext4fs_get_new_blk_no();
1399 if (direct_blockno == -1) {
1400 printf("no block left to assign\n");
1401 return;
1402 }
1403 file_inode->b.blocks.dir_blocks[i] = direct_blockno;
1404 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1405
1406 total_remaining_blocks--;
1407 if (total_remaining_blocks == 0)
1408 break;
1409 }
1410
1411 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1412 &no_blks_reqd);
1413 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1414 &no_blks_reqd);
1415 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1416 &no_blks_reqd);
1417 *total_no_of_block += no_blks_reqd;
1418 }
1419
1420 #endif
1421
1422 static struct ext4_extent_header *ext4fs_get_extent_block
1423 (struct ext2_data *data, char *buf,
1424 struct ext4_extent_header *ext_block,
1425 uint32_t fileblock, int log2_blksz)
1426 {
1427 struct ext4_extent_idx *index;
1428 unsigned long long block;
1429 struct ext_filesystem *fs = get_fs();
1430 int i;
1431
1432 while (1) {
1433 index = (struct ext4_extent_idx *)(ext_block + 1);
1434
1435 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1436 return 0;
1437
1438 if (ext_block->eh_depth == 0)
1439 return ext_block;
1440 i = -1;
1441 do {
1442 i++;
1443 if (i >= le16_to_cpu(ext_block->eh_entries))
1444 break;
1445 } while (fileblock > le32_to_cpu(index[i].ei_block));
1446
1447 if (--i < 0)
1448 return 0;
1449
1450 block = le16_to_cpu(index[i].ei_leaf_hi);
1451 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1452
1453 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, fs->blksz,
1454 buf))
1455 ext_block = (struct ext4_extent_header *)buf;
1456 else
1457 return 0;
1458 }
1459 }
1460
1461 static int ext4fs_blockgroup
1462 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1463 {
1464 long int blkno;
1465 unsigned int blkoff, desc_per_blk;
1466 int log2blksz = get_fs()->dev_desc->log2blksz;
1467
1468 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1469
1470 blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1471 group / desc_per_blk;
1472 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1473
1474 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1475 group, blkno, blkoff);
1476
1477 return ext4fs_devread((lbaint_t)blkno <<
1478 (LOG2_BLOCK_SIZE(data) - log2blksz),
1479 blkoff, sizeof(struct ext2_block_group),
1480 (char *)blkgrp);
1481 }
1482
1483 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1484 {
1485 struct ext2_block_group blkgrp;
1486 struct ext2_sblock *sblock = &data->sblock;
1487 struct ext_filesystem *fs = get_fs();
1488 int log2blksz = get_fs()->dev_desc->log2blksz;
1489 int inodes_per_block, status;
1490 long int blkno;
1491 unsigned int blkoff;
1492
1493 /* It is easier to calculate if the first inode is 0. */
1494 ino--;
1495 status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1496 (sblock->inodes_per_group), &blkgrp);
1497 if (status == 0)
1498 return 0;
1499
1500 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1501 blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1502 (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1503 blkoff = (ino % inodes_per_block) * fs->inodesz;
1504 /* Read the inode. */
1505 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1506 log2blksz), blkoff,
1507 sizeof(struct ext2_inode), (char *)inode);
1508 if (status == 0)
1509 return 0;
1510
1511 return 1;
1512 }
1513
1514 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1515 {
1516 long int blknr;
1517 int blksz;
1518 int log2_blksz;
1519 int status;
1520 long int rblock;
1521 long int perblock_parent;
1522 long int perblock_child;
1523 unsigned long long start;
1524 /* get the blocksize of the filesystem */
1525 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1526 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1527 - get_fs()->dev_desc->log2blksz;
1528
1529 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1530 char *buf = zalloc(blksz);
1531 if (!buf)
1532 return -ENOMEM;
1533 struct ext4_extent_header *ext_block;
1534 struct ext4_extent *extent;
1535 int i = -1;
1536 ext_block =
1537 ext4fs_get_extent_block(ext4fs_root, buf,
1538 (struct ext4_extent_header *)
1539 inode->b.blocks.dir_blocks,
1540 fileblock, log2_blksz);
1541 if (!ext_block) {
1542 printf("invalid extent block\n");
1543 free(buf);
1544 return -EINVAL;
1545 }
1546
1547 extent = (struct ext4_extent *)(ext_block + 1);
1548
1549 do {
1550 i++;
1551 if (i >= le16_to_cpu(ext_block->eh_entries))
1552 break;
1553 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1554 if (--i >= 0) {
1555 fileblock -= le32_to_cpu(extent[i].ee_block);
1556 if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1557 free(buf);
1558 return 0;
1559 }
1560
1561 start = le16_to_cpu(extent[i].ee_start_hi);
1562 start = (start << 32) +
1563 le32_to_cpu(extent[i].ee_start_lo);
1564 free(buf);
1565 return fileblock + start;
1566 }
1567
1568 printf("Extent Error\n");
1569 free(buf);
1570 return -1;
1571 }
1572
1573 /* Direct blocks. */
1574 if (fileblock < INDIRECT_BLOCKS)
1575 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1576
1577 /* Indirect. */
1578 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1579 if (ext4fs_indir1_block == NULL) {
1580 ext4fs_indir1_block = zalloc(blksz);
1581 if (ext4fs_indir1_block == NULL) {
1582 printf("** SI ext2fs read block (indir 1)"
1583 "malloc failed. **\n");
1584 return -1;
1585 }
1586 ext4fs_indir1_size = blksz;
1587 ext4fs_indir1_blkno = -1;
1588 }
1589 if (blksz != ext4fs_indir1_size) {
1590 free(ext4fs_indir1_block);
1591 ext4fs_indir1_block = NULL;
1592 ext4fs_indir1_size = 0;
1593 ext4fs_indir1_blkno = -1;
1594 ext4fs_indir1_block = zalloc(blksz);
1595 if (ext4fs_indir1_block == NULL) {
1596 printf("** SI ext2fs read block (indir 1):"
1597 "malloc failed. **\n");
1598 return -1;
1599 }
1600 ext4fs_indir1_size = blksz;
1601 }
1602 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1603 log2_blksz) != ext4fs_indir1_blkno) {
1604 status =
1605 ext4fs_devread((lbaint_t)__le32_to_cpu
1606 (inode->b.blocks.
1607 indir_block) << log2_blksz, 0,
1608 blksz, (char *)ext4fs_indir1_block);
1609 if (status == 0) {
1610 printf("** SI ext2fs read block (indir 1)"
1611 "failed. **\n");
1612 return 0;
1613 }
1614 ext4fs_indir1_blkno =
1615 __le32_to_cpu(inode->b.blocks.
1616 indir_block) << log2_blksz;
1617 }
1618 blknr = __le32_to_cpu(ext4fs_indir1_block
1619 [fileblock - INDIRECT_BLOCKS]);
1620 }
1621 /* Double indirect. */
1622 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1623 (blksz / 4 + 1)))) {
1624
1625 long int perblock = blksz / 4;
1626 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1627
1628 if (ext4fs_indir1_block == NULL) {
1629 ext4fs_indir1_block = zalloc(blksz);
1630 if (ext4fs_indir1_block == NULL) {
1631 printf("** DI ext2fs read block (indir 2 1)"
1632 "malloc failed. **\n");
1633 return -1;
1634 }
1635 ext4fs_indir1_size = blksz;
1636 ext4fs_indir1_blkno = -1;
1637 }
1638 if (blksz != ext4fs_indir1_size) {
1639 free(ext4fs_indir1_block);
1640 ext4fs_indir1_block = NULL;
1641 ext4fs_indir1_size = 0;
1642 ext4fs_indir1_blkno = -1;
1643 ext4fs_indir1_block = zalloc(blksz);
1644 if (ext4fs_indir1_block == NULL) {
1645 printf("** DI ext2fs read block (indir 2 1)"
1646 "malloc failed. **\n");
1647 return -1;
1648 }
1649 ext4fs_indir1_size = blksz;
1650 }
1651 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1652 log2_blksz) != ext4fs_indir1_blkno) {
1653 status =
1654 ext4fs_devread((lbaint_t)__le32_to_cpu
1655 (inode->b.blocks.
1656 double_indir_block) << log2_blksz,
1657 0, blksz,
1658 (char *)ext4fs_indir1_block);
1659 if (status == 0) {
1660 printf("** DI ext2fs read block (indir 2 1)"
1661 "failed. **\n");
1662 return -1;
1663 }
1664 ext4fs_indir1_blkno =
1665 __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1666 log2_blksz;
1667 }
1668
1669 if (ext4fs_indir2_block == NULL) {
1670 ext4fs_indir2_block = zalloc(blksz);
1671 if (ext4fs_indir2_block == NULL) {
1672 printf("** DI ext2fs read block (indir 2 2)"
1673 "malloc failed. **\n");
1674 return -1;
1675 }
1676 ext4fs_indir2_size = blksz;
1677 ext4fs_indir2_blkno = -1;
1678 }
1679 if (blksz != ext4fs_indir2_size) {
1680 free(ext4fs_indir2_block);
1681 ext4fs_indir2_block = NULL;
1682 ext4fs_indir2_size = 0;
1683 ext4fs_indir2_blkno = -1;
1684 ext4fs_indir2_block = zalloc(blksz);
1685 if (ext4fs_indir2_block == NULL) {
1686 printf("** DI ext2fs read block (indir 2 2)"
1687 "malloc failed. **\n");
1688 return -1;
1689 }
1690 ext4fs_indir2_size = blksz;
1691 }
1692 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1693 log2_blksz) != ext4fs_indir2_blkno) {
1694 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1695 (ext4fs_indir1_block
1696 [rblock /
1697 perblock]) << log2_blksz, 0,
1698 blksz,
1699 (char *)ext4fs_indir2_block);
1700 if (status == 0) {
1701 printf("** DI ext2fs read block (indir 2 2)"
1702 "failed. **\n");
1703 return -1;
1704 }
1705 ext4fs_indir2_blkno =
1706 __le32_to_cpu(ext4fs_indir1_block[rblock
1707 /
1708 perblock]) <<
1709 log2_blksz;
1710 }
1711 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1712 }
1713 /* Tripple indirect. */
1714 else {
1715 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1716 (blksz / 4 * blksz / 4));
1717 perblock_child = blksz / 4;
1718 perblock_parent = ((blksz / 4) * (blksz / 4));
1719
1720 if (ext4fs_indir1_block == NULL) {
1721 ext4fs_indir1_block = zalloc(blksz);
1722 if (ext4fs_indir1_block == NULL) {
1723 printf("** TI ext2fs read block (indir 2 1)"
1724 "malloc failed. **\n");
1725 return -1;
1726 }
1727 ext4fs_indir1_size = blksz;
1728 ext4fs_indir1_blkno = -1;
1729 }
1730 if (blksz != ext4fs_indir1_size) {
1731 free(ext4fs_indir1_block);
1732 ext4fs_indir1_block = NULL;
1733 ext4fs_indir1_size = 0;
1734 ext4fs_indir1_blkno = -1;
1735 ext4fs_indir1_block = zalloc(blksz);
1736 if (ext4fs_indir1_block == NULL) {
1737 printf("** TI ext2fs read block (indir 2 1)"
1738 "malloc failed. **\n");
1739 return -1;
1740 }
1741 ext4fs_indir1_size = blksz;
1742 }
1743 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1744 log2_blksz) != ext4fs_indir1_blkno) {
1745 status = ext4fs_devread
1746 ((lbaint_t)
1747 __le32_to_cpu(inode->b.blocks.triple_indir_block)
1748 << log2_blksz, 0, blksz,
1749 (char *)ext4fs_indir1_block);
1750 if (status == 0) {
1751 printf("** TI ext2fs read block (indir 2 1)"
1752 "failed. **\n");
1753 return -1;
1754 }
1755 ext4fs_indir1_blkno =
1756 __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1757 log2_blksz;
1758 }
1759
1760 if (ext4fs_indir2_block == NULL) {
1761 ext4fs_indir2_block = zalloc(blksz);
1762 if (ext4fs_indir2_block == NULL) {
1763 printf("** TI ext2fs read block (indir 2 2)"
1764 "malloc failed. **\n");
1765 return -1;
1766 }
1767 ext4fs_indir2_size = blksz;
1768 ext4fs_indir2_blkno = -1;
1769 }
1770 if (blksz != ext4fs_indir2_size) {
1771 free(ext4fs_indir2_block);
1772 ext4fs_indir2_block = NULL;
1773 ext4fs_indir2_size = 0;
1774 ext4fs_indir2_blkno = -1;
1775 ext4fs_indir2_block = zalloc(blksz);
1776 if (ext4fs_indir2_block == NULL) {
1777 printf("** TI ext2fs read block (indir 2 2)"
1778 "malloc failed. **\n");
1779 return -1;
1780 }
1781 ext4fs_indir2_size = blksz;
1782 }
1783 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1784 perblock_parent]) <<
1785 log2_blksz)
1786 != ext4fs_indir2_blkno) {
1787 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1788 (ext4fs_indir1_block
1789 [rblock /
1790 perblock_parent]) <<
1791 log2_blksz, 0, blksz,
1792 (char *)ext4fs_indir2_block);
1793 if (status == 0) {
1794 printf("** TI ext2fs read block (indir 2 2)"
1795 "failed. **\n");
1796 return -1;
1797 }
1798 ext4fs_indir2_blkno =
1799 __le32_to_cpu(ext4fs_indir1_block[rblock /
1800 perblock_parent])
1801 << log2_blksz;
1802 }
1803
1804 if (ext4fs_indir3_block == NULL) {
1805 ext4fs_indir3_block = zalloc(blksz);
1806 if (ext4fs_indir3_block == NULL) {
1807 printf("** TI ext2fs read block (indir 2 2)"
1808 "malloc failed. **\n");
1809 return -1;
1810 }
1811 ext4fs_indir3_size = blksz;
1812 ext4fs_indir3_blkno = -1;
1813 }
1814 if (blksz != ext4fs_indir3_size) {
1815 free(ext4fs_indir3_block);
1816 ext4fs_indir3_block = NULL;
1817 ext4fs_indir3_size = 0;
1818 ext4fs_indir3_blkno = -1;
1819 ext4fs_indir3_block = zalloc(blksz);
1820 if (ext4fs_indir3_block == NULL) {
1821 printf("** TI ext2fs read block (indir 2 2)"
1822 "malloc failed. **\n");
1823 return -1;
1824 }
1825 ext4fs_indir3_size = blksz;
1826 }
1827 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1828 /
1829 perblock_child]) <<
1830 log2_blksz) != ext4fs_indir3_blkno) {
1831 status =
1832 ext4fs_devread((lbaint_t)__le32_to_cpu
1833 (ext4fs_indir2_block
1834 [(rblock / perblock_child)
1835 % (blksz / 4)]) << log2_blksz, 0,
1836 blksz, (char *)ext4fs_indir3_block);
1837 if (status == 0) {
1838 printf("** TI ext2fs read block (indir 2 2)"
1839 "failed. **\n");
1840 return -1;
1841 }
1842 ext4fs_indir3_blkno =
1843 __le32_to_cpu(ext4fs_indir2_block[(rblock /
1844 perblock_child) %
1845 (blksz /
1846 4)]) <<
1847 log2_blksz;
1848 }
1849
1850 blknr = __le32_to_cpu(ext4fs_indir3_block
1851 [rblock % perblock_child]);
1852 }
1853 debug("read_allocated_block %ld\n", blknr);
1854
1855 return blknr;
1856 }
1857
1858 void ext4fs_close(void)
1859 {
1860 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1861 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1862 ext4fs_file = NULL;
1863 }
1864 if (ext4fs_root != NULL) {
1865 free(ext4fs_root);
1866 ext4fs_root = NULL;
1867 }
1868 if (ext4fs_indir1_block != NULL) {
1869 free(ext4fs_indir1_block);
1870 ext4fs_indir1_block = NULL;
1871 ext4fs_indir1_size = 0;
1872 ext4fs_indir1_blkno = -1;
1873 }
1874 if (ext4fs_indir2_block != NULL) {
1875 free(ext4fs_indir2_block);
1876 ext4fs_indir2_block = NULL;
1877 ext4fs_indir2_size = 0;
1878 ext4fs_indir2_blkno = -1;
1879 }
1880 if (ext4fs_indir3_block != NULL) {
1881 free(ext4fs_indir3_block);
1882 ext4fs_indir3_block = NULL;
1883 ext4fs_indir3_size = 0;
1884 ext4fs_indir3_blkno = -1;
1885 }
1886 }
1887
1888 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1889 struct ext2fs_node **fnode, int *ftype)
1890 {
1891 unsigned int fpos = 0;
1892 int status;
1893 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1894
1895 #ifdef DEBUG
1896 if (name != NULL)
1897 printf("Iterate dir %s\n", name);
1898 #endif /* of DEBUG */
1899 if (!diro->inode_read) {
1900 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1901 if (status == 0)
1902 return 0;
1903 }
1904 /* Search the file. */
1905 while (fpos < __le32_to_cpu(diro->inode.size)) {
1906 struct ext2_dirent dirent;
1907
1908 status = ext4fs_read_file(diro, fpos,
1909 sizeof(struct ext2_dirent),
1910 (char *) &dirent);
1911 if (status < 1)
1912 return 0;
1913
1914 if (dirent.namelen != 0) {
1915 char filename[dirent.namelen + 1];
1916 struct ext2fs_node *fdiro;
1917 int type = FILETYPE_UNKNOWN;
1918
1919 status = ext4fs_read_file(diro,
1920 fpos +
1921 sizeof(struct ext2_dirent),
1922 dirent.namelen, filename);
1923 if (status < 1)
1924 return 0;
1925
1926 fdiro = zalloc(sizeof(struct ext2fs_node));
1927 if (!fdiro)
1928 return 0;
1929
1930 fdiro->data = diro->data;
1931 fdiro->ino = __le32_to_cpu(dirent.inode);
1932
1933 filename[dirent.namelen] = '\0';
1934
1935 if (dirent.filetype != FILETYPE_UNKNOWN) {
1936 fdiro->inode_read = 0;
1937
1938 if (dirent.filetype == FILETYPE_DIRECTORY)
1939 type = FILETYPE_DIRECTORY;
1940 else if (dirent.filetype == FILETYPE_SYMLINK)
1941 type = FILETYPE_SYMLINK;
1942 else if (dirent.filetype == FILETYPE_REG)
1943 type = FILETYPE_REG;
1944 } else {
1945 status = ext4fs_read_inode(diro->data,
1946 __le32_to_cpu
1947 (dirent.inode),
1948 &fdiro->inode);
1949 if (status == 0) {
1950 free(fdiro);
1951 return 0;
1952 }
1953 fdiro->inode_read = 1;
1954
1955 if ((__le16_to_cpu(fdiro->inode.mode) &
1956 FILETYPE_INO_MASK) ==
1957 FILETYPE_INO_DIRECTORY) {
1958 type = FILETYPE_DIRECTORY;
1959 } else if ((__le16_to_cpu(fdiro->inode.mode)
1960 & FILETYPE_INO_MASK) ==
1961 FILETYPE_INO_SYMLINK) {
1962 type = FILETYPE_SYMLINK;
1963 } else if ((__le16_to_cpu(fdiro->inode.mode)
1964 & FILETYPE_INO_MASK) ==
1965 FILETYPE_INO_REG) {
1966 type = FILETYPE_REG;
1967 }
1968 }
1969 #ifdef DEBUG
1970 printf("iterate >%s<\n", filename);
1971 #endif /* of DEBUG */
1972 if ((name != NULL) && (fnode != NULL)
1973 && (ftype != NULL)) {
1974 if (strcmp(filename, name) == 0) {
1975 *ftype = type;
1976 *fnode = fdiro;
1977 return 1;
1978 }
1979 } else {
1980 if (fdiro->inode_read == 0) {
1981 status = ext4fs_read_inode(diro->data,
1982 __le32_to_cpu(
1983 dirent.inode),
1984 &fdiro->inode);
1985 if (status == 0) {
1986 free(fdiro);
1987 return 0;
1988 }
1989 fdiro->inode_read = 1;
1990 }
1991 switch (type) {
1992 case FILETYPE_DIRECTORY:
1993 printf("<DIR> ");
1994 break;
1995 case FILETYPE_SYMLINK:
1996 printf("<SYM> ");
1997 break;
1998 case FILETYPE_REG:
1999 printf(" ");
2000 break;
2001 default:
2002 printf("< ? > ");
2003 break;
2004 }
2005 printf("%10d %s\n",
2006 __le32_to_cpu(fdiro->inode.size),
2007 filename);
2008 }
2009 free(fdiro);
2010 }
2011 fpos += __le16_to_cpu(dirent.direntlen);
2012 }
2013 return 0;
2014 }
2015
2016 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2017 {
2018 char *symlink;
2019 struct ext2fs_node *diro = node;
2020 int status;
2021
2022 if (!diro->inode_read) {
2023 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2024 if (status == 0)
2025 return 0;
2026 }
2027 symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2028 if (!symlink)
2029 return 0;
2030
2031 if (__le32_to_cpu(diro->inode.size) <= 60) {
2032 strncpy(symlink, diro->inode.b.symlink,
2033 __le32_to_cpu(diro->inode.size));
2034 } else {
2035 status = ext4fs_read_file(diro, 0,
2036 __le32_to_cpu(diro->inode.size),
2037 symlink);
2038 if (status == 0) {
2039 free(symlink);
2040 return 0;
2041 }
2042 }
2043 symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2044 return symlink;
2045 }
2046
2047 static int ext4fs_find_file1(const char *currpath,
2048 struct ext2fs_node *currroot,
2049 struct ext2fs_node **currfound, int *foundtype)
2050 {
2051 char fpath[strlen(currpath) + 1];
2052 char *name = fpath;
2053 char *next;
2054 int status;
2055 int type = FILETYPE_DIRECTORY;
2056 struct ext2fs_node *currnode = currroot;
2057 struct ext2fs_node *oldnode = currroot;
2058
2059 strncpy(fpath, currpath, strlen(currpath) + 1);
2060
2061 /* Remove all leading slashes. */
2062 while (*name == '/')
2063 name++;
2064
2065 if (!*name) {
2066 *currfound = currnode;
2067 return 1;
2068 }
2069
2070 for (;;) {
2071 int found;
2072
2073 /* Extract the actual part from the pathname. */
2074 next = strchr(name, '/');
2075 if (next) {
2076 /* Remove all leading slashes. */
2077 while (*next == '/')
2078 *(next++) = '\0';
2079 }
2080
2081 if (type != FILETYPE_DIRECTORY) {
2082 ext4fs_free_node(currnode, currroot);
2083 return 0;
2084 }
2085
2086 oldnode = currnode;
2087
2088 /* Iterate over the directory. */
2089 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2090 if (found == 0)
2091 return 0;
2092
2093 if (found == -1)
2094 break;
2095
2096 /* Read in the symlink and follow it. */
2097 if (type == FILETYPE_SYMLINK) {
2098 char *symlink;
2099
2100 /* Test if the symlink does not loop. */
2101 if (++symlinknest == 8) {
2102 ext4fs_free_node(currnode, currroot);
2103 ext4fs_free_node(oldnode, currroot);
2104 return 0;
2105 }
2106
2107 symlink = ext4fs_read_symlink(currnode);
2108 ext4fs_free_node(currnode, currroot);
2109
2110 if (!symlink) {
2111 ext4fs_free_node(oldnode, currroot);
2112 return 0;
2113 }
2114
2115 debug("Got symlink >%s<\n", symlink);
2116
2117 if (symlink[0] == '/') {
2118 ext4fs_free_node(oldnode, currroot);
2119 oldnode = &ext4fs_root->diropen;
2120 }
2121
2122 /* Lookup the node the symlink points to. */
2123 status = ext4fs_find_file1(symlink, oldnode,
2124 &currnode, &type);
2125
2126 free(symlink);
2127
2128 if (status == 0) {
2129 ext4fs_free_node(oldnode, currroot);
2130 return 0;
2131 }
2132 }
2133
2134 ext4fs_free_node(oldnode, currroot);
2135
2136 /* Found the node! */
2137 if (!next || *next == '\0') {
2138 *currfound = currnode;
2139 *foundtype = type;
2140 return 1;
2141 }
2142 name = next;
2143 }
2144 return -1;
2145 }
2146
2147 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2148 struct ext2fs_node **foundnode, int expecttype)
2149 {
2150 int status;
2151 int foundtype = FILETYPE_DIRECTORY;
2152
2153 symlinknest = 0;
2154 if (!path)
2155 return 0;
2156
2157 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2158 if (status == 0)
2159 return 0;
2160
2161 /* Check if the node that was found was of the expected type. */
2162 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2163 return 0;
2164 else if ((expecttype == FILETYPE_DIRECTORY)
2165 && (foundtype != expecttype))
2166 return 0;
2167
2168 return 1;
2169 }
2170
2171 int ext4fs_open(const char *filename)
2172 {
2173 struct ext2fs_node *fdiro = NULL;
2174 int status;
2175 int len;
2176
2177 if (ext4fs_root == NULL)
2178 return -1;
2179
2180 ext4fs_file = NULL;
2181 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2182 FILETYPE_REG);
2183 if (status == 0)
2184 goto fail;
2185
2186 if (!fdiro->inode_read) {
2187 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2188 &fdiro->inode);
2189 if (status == 0)
2190 goto fail;
2191 }
2192 len = __le32_to_cpu(fdiro->inode.size);
2193 ext4fs_file = fdiro;
2194
2195 return len;
2196 fail:
2197 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2198
2199 return -1;
2200 }
2201
2202 int ext4fs_mount(unsigned part_length)
2203 {
2204 struct ext2_data *data;
2205 int status;
2206 struct ext_filesystem *fs = get_fs();
2207 data = zalloc(SUPERBLOCK_SIZE);
2208 if (!data)
2209 return 0;
2210
2211 /* Read the superblock. */
2212 status = ext4_read_superblock((char *)&data->sblock);
2213
2214 if (status == 0)
2215 goto fail;
2216
2217 /* Make sure this is an ext2 filesystem. */
2218 if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2219 goto fail;
2220
2221 if (__le32_to_cpu(data->sblock.revision_level == 0))
2222 fs->inodesz = 128;
2223 else
2224 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2225
2226 debug("EXT2 rev %d, inode_size %d\n",
2227 __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2228
2229 data->diropen.data = data;
2230 data->diropen.ino = 2;
2231 data->diropen.inode_read = 1;
2232 data->inode = &data->diropen.inode;
2233
2234 status = ext4fs_read_inode(data, 2, data->inode);
2235 if (status == 0)
2236 goto fail;
2237
2238 ext4fs_root = data;
2239
2240 return 1;
2241 fail:
2242 printf("Failed to mount ext2 filesystem...\n");
2243 free(data);
2244 ext4fs_root = NULL;
2245
2246 return 0;
2247 }
"Das U-Boot" Source Tree