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ext4: Refuse to mount filesystems with 64bit feature set
[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 * SPDX-License-Identifier: GPL-2.0+
20 */
21
22 #include <common.h>
23 #include <ext_common.h>
24 #include <ext4fs.h>
25 #include <inttypes.h>
26 #include <malloc.h>
27 #include <memalign.h>
28 #include <stddef.h>
29 #include <linux/stat.h>
30 #include <linux/time.h>
31 #include <asm/byteorder.h>
32 #include "ext4_common.h"
33
34 struct ext2_data *ext4fs_root;
35 struct ext2fs_node *ext4fs_file;
36 uint32_t *ext4fs_indir1_block;
37 int ext4fs_indir1_size;
38 int ext4fs_indir1_blkno = -1;
39 uint32_t *ext4fs_indir2_block;
40 int ext4fs_indir2_size;
41 int ext4fs_indir2_blkno = -1;
42
43 uint32_t *ext4fs_indir3_block;
44 int ext4fs_indir3_size;
45 int ext4fs_indir3_blkno = -1;
46 struct ext2_inode *g_parent_inode;
47 static int symlinknest;
48
49 #if defined(CONFIG_EXT4_WRITE)
50 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
51 {
52 uint32_t res = size / n;
53 if (res * n != size)
54 res++;
55
56 return res;
57 }
58
59 void put_ext4(uint64_t off, void *buf, uint32_t size)
60 {
61 uint64_t startblock;
62 uint64_t remainder;
63 unsigned char *temp_ptr = NULL;
64 struct ext_filesystem *fs = get_fs();
65 int log2blksz = fs->dev_desc->log2blksz;
66 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
67
68 startblock = off >> log2blksz;
69 startblock += part_offset;
70 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
71
72 if (fs->dev_desc == NULL)
73 return;
74
75 if ((startblock + (size >> log2blksz)) >
76 (part_offset + fs->total_sect)) {
77 printf("part_offset is " LBAFU "\n", part_offset);
78 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
79 printf("error: overflow occurs\n");
80 return;
81 }
82
83 if (remainder) {
84 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
85 temp_ptr = sec_buf;
86 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
87 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
88 } else {
89 if (size >> log2blksz != 0) {
90 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
91 (unsigned long *)buf);
92 } else {
93 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
94 temp_ptr = sec_buf;
95 memcpy(temp_ptr, buf, size);
96 blk_dwrite(fs->dev_desc, startblock, 1,
97 (unsigned long *)sec_buf);
98 }
99 }
100 }
101
102 static int _get_new_inode_no(unsigned char *buffer)
103 {
104 struct ext_filesystem *fs = get_fs();
105 unsigned char input;
106 int operand, status;
107 int count = 1;
108 int j = 0;
109
110 /* get the blocksize of the filesystem */
111 unsigned char *ptr = buffer;
112 while (*ptr == 255) {
113 ptr++;
114 count += 8;
115 if (count > ext4fs_root->sblock.inodes_per_group)
116 return -1;
117 }
118
119 for (j = 0; j < fs->blksz; j++) {
120 input = *ptr;
121 int i = 0;
122 while (i <= 7) {
123 operand = 1 << i;
124 status = input & operand;
125 if (status) {
126 i++;
127 count++;
128 } else {
129 *ptr |= operand;
130 return count;
131 }
132 }
133 ptr = ptr + 1;
134 }
135
136 return -1;
137 }
138
139 static int _get_new_blk_no(unsigned char *buffer)
140 {
141 unsigned char input;
142 int operand, status;
143 int count = 0;
144 int j = 0;
145 unsigned char *ptr = buffer;
146 struct ext_filesystem *fs = get_fs();
147
148 if (fs->blksz != 1024)
149 count = 0;
150 else
151 count = 1;
152
153 while (*ptr == 255) {
154 ptr++;
155 count += 8;
156 if (count == (fs->blksz * 8))
157 return -1;
158 }
159
160 for (j = 0; j < fs->blksz; j++) {
161 input = *ptr;
162 int i = 0;
163 while (i <= 7) {
164 operand = 1 << i;
165 status = input & operand;
166 if (status) {
167 i++;
168 count++;
169 } else {
170 *ptr |= operand;
171 return count;
172 }
173 }
174 ptr = ptr + 1;
175 }
176
177 return -1;
178 }
179
180 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
181 {
182 int i, remainder, status;
183 unsigned char *ptr = buffer;
184 unsigned char operand;
185 i = blockno / 8;
186 remainder = blockno % 8;
187 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
188
189 i = i - (index * blocksize);
190 if (blocksize != 1024) {
191 ptr = ptr + i;
192 operand = 1 << remainder;
193 status = *ptr & operand;
194 if (status)
195 return -1;
196
197 *ptr = *ptr | operand;
198 return 0;
199 } else {
200 if (remainder == 0) {
201 ptr = ptr + i - 1;
202 operand = (1 << 7);
203 } else {
204 ptr = ptr + i;
205 operand = (1 << (remainder - 1));
206 }
207 status = *ptr & operand;
208 if (status)
209 return -1;
210
211 *ptr = *ptr | operand;
212 return 0;
213 }
214 }
215
216 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
217 {
218 int i, remainder, status;
219 unsigned char *ptr = buffer;
220 unsigned char operand;
221 i = blockno / 8;
222 remainder = blockno % 8;
223 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
224
225 i = i - (index * blocksize);
226 if (blocksize != 1024) {
227 ptr = ptr + i;
228 operand = (1 << remainder);
229 status = *ptr & operand;
230 if (status)
231 *ptr = *ptr & ~(operand);
232 } else {
233 if (remainder == 0) {
234 ptr = ptr + i - 1;
235 operand = (1 << 7);
236 } else {
237 ptr = ptr + i;
238 operand = (1 << (remainder - 1));
239 }
240 status = *ptr & operand;
241 if (status)
242 *ptr = *ptr & ~(operand);
243 }
244 }
245
246 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
247 {
248 int i, remainder, status;
249 unsigned char *ptr = buffer;
250 unsigned char operand;
251
252 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
253 i = inode_no / 8;
254 remainder = inode_no % 8;
255 if (remainder == 0) {
256 ptr = ptr + i - 1;
257 operand = (1 << 7);
258 } else {
259 ptr = ptr + i;
260 operand = (1 << (remainder - 1));
261 }
262 status = *ptr & operand;
263 if (status)
264 return -1;
265
266 *ptr = *ptr | operand;
267
268 return 0;
269 }
270
271 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
272 {
273 int i, remainder, status;
274 unsigned char *ptr = buffer;
275 unsigned char operand;
276
277 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
278 i = inode_no / 8;
279 remainder = inode_no % 8;
280 if (remainder == 0) {
281 ptr = ptr + i - 1;
282 operand = (1 << 7);
283 } else {
284 ptr = ptr + i;
285 operand = (1 << (remainder - 1));
286 }
287 status = *ptr & operand;
288 if (status)
289 *ptr = *ptr & ~(operand);
290 }
291
292 int ext4fs_checksum_update(unsigned int i)
293 {
294 struct ext2_block_group *desc;
295 struct ext_filesystem *fs = get_fs();
296 __u16 crc = 0;
297
298 desc = (struct ext2_block_group *)&fs->bgd[i];
299 if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
300 int offset = offsetof(struct ext2_block_group, bg_checksum);
301
302 crc = ext2fs_crc16(~0, fs->sb->unique_id,
303 sizeof(fs->sb->unique_id));
304 crc = ext2fs_crc16(crc, &i, sizeof(i));
305 crc = ext2fs_crc16(crc, desc, offset);
306 offset += sizeof(desc->bg_checksum); /* skip checksum */
307 assert(offset == sizeof(*desc));
308 }
309
310 return crc;
311 }
312
313 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
314 {
315 int dentry_length;
316 int sizeof_void_space;
317 int new_entry_byte_reqd;
318 short padding_factor = 0;
319
320 if (dir->namelen % 4 != 0)
321 padding_factor = 4 - (dir->namelen % 4);
322
323 dentry_length = sizeof(struct ext2_dirent) +
324 dir->namelen + padding_factor;
325 sizeof_void_space = dir->direntlen - dentry_length;
326 if (sizeof_void_space == 0)
327 return 0;
328
329 padding_factor = 0;
330 if (strlen(filename) % 4 != 0)
331 padding_factor = 4 - (strlen(filename) % 4);
332
333 new_entry_byte_reqd = strlen(filename) +
334 sizeof(struct ext2_dirent) + padding_factor;
335 if (sizeof_void_space >= new_entry_byte_reqd) {
336 dir->direntlen = dentry_length;
337 return sizeof_void_space;
338 }
339
340 return 0;
341 }
342
343 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
344 {
345 unsigned int *zero_buffer = NULL;
346 char *root_first_block_buffer = NULL;
347 int direct_blk_idx;
348 long int root_blknr;
349 long int first_block_no_of_root = 0;
350 long int previous_blknr = -1;
351 int totalbytes = 0;
352 short int padding_factor = 0;
353 unsigned int new_entry_byte_reqd;
354 unsigned int last_entry_dirlen;
355 int sizeof_void_space = 0;
356 int templength = 0;
357 int inodeno;
358 int status;
359 struct ext_filesystem *fs = get_fs();
360 /* directory entry */
361 struct ext2_dirent *dir;
362 char *temp_dir = NULL;
363
364 zero_buffer = zalloc(fs->blksz);
365 if (!zero_buffer) {
366 printf("No Memory\n");
367 return;
368 }
369 root_first_block_buffer = zalloc(fs->blksz);
370 if (!root_first_block_buffer) {
371 free(zero_buffer);
372 printf("No Memory\n");
373 return;
374 }
375 restart:
376
377 /* read the block no allocated to a file */
378 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
379 direct_blk_idx++) {
380 root_blknr = read_allocated_block(g_parent_inode,
381 direct_blk_idx);
382 if (root_blknr == 0) {
383 first_block_no_of_root = previous_blknr;
384 break;
385 }
386 previous_blknr = root_blknr;
387 }
388
389 status = ext4fs_devread((lbaint_t)first_block_no_of_root
390 * fs->sect_perblk,
391 0, fs->blksz, root_first_block_buffer);
392 if (status == 0)
393 goto fail;
394
395 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
396 goto fail;
397 dir = (struct ext2_dirent *)root_first_block_buffer;
398 totalbytes = 0;
399 while (dir->direntlen > 0) {
400 /*
401 * blocksize-totalbytes because last directory length
402 * i.e. dir->direntlen is free availble space in the
403 * block that means it is a last entry of directory
404 * entry
405 */
406
407 /* traversing the each directory entry */
408 if (fs->blksz - totalbytes == dir->direntlen) {
409 if (strlen(filename) % 4 != 0)
410 padding_factor = 4 - (strlen(filename) % 4);
411
412 new_entry_byte_reqd = strlen(filename) +
413 sizeof(struct ext2_dirent) + padding_factor;
414 padding_factor = 0;
415 /*
416 * update last directory entry length to its
417 * length because we are creating new directory
418 * entry
419 */
420 if (dir->namelen % 4 != 0)
421 padding_factor = 4 - (dir->namelen % 4);
422
423 last_entry_dirlen = dir->namelen +
424 sizeof(struct ext2_dirent) + padding_factor;
425 if ((fs->blksz - totalbytes - last_entry_dirlen) <
426 new_entry_byte_reqd) {
427 printf("1st Block Full:Allocate new block\n");
428
429 if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
430 printf("Directory exceeds limit\n");
431 goto fail;
432 }
433 g_parent_inode->b.blocks.dir_blocks
434 [direct_blk_idx] = ext4fs_get_new_blk_no();
435 if (g_parent_inode->b.blocks.dir_blocks
436 [direct_blk_idx] == -1) {
437 printf("no block left to assign\n");
438 goto fail;
439 }
440 put_ext4(((uint64_t)
441 ((uint64_t)g_parent_inode->b.
442 blocks.dir_blocks[direct_blk_idx] *
443 (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
444 g_parent_inode->size =
445 g_parent_inode->size + fs->blksz;
446 g_parent_inode->blockcnt =
447 g_parent_inode->blockcnt + fs->sect_perblk;
448 if (ext4fs_put_metadata
449 (root_first_block_buffer,
450 first_block_no_of_root))
451 goto fail;
452 goto restart;
453 }
454 dir->direntlen = last_entry_dirlen;
455 break;
456 }
457
458 templength = dir->direntlen;
459 totalbytes = totalbytes + templength;
460 sizeof_void_space = check_void_in_dentry(dir, filename);
461 if (sizeof_void_space)
462 break;
463
464 dir = (struct ext2_dirent *)((char *)dir + templength);
465 }
466
467 /* make a pointer ready for creating next directory entry */
468 templength = dir->direntlen;
469 totalbytes = totalbytes + templength;
470 dir = (struct ext2_dirent *)((char *)dir + templength);
471
472 /* get the next available inode number */
473 inodeno = ext4fs_get_new_inode_no();
474 if (inodeno == -1) {
475 printf("no inode left to assign\n");
476 goto fail;
477 }
478 dir->inode = inodeno;
479 if (sizeof_void_space)
480 dir->direntlen = sizeof_void_space;
481 else
482 dir->direntlen = fs->blksz - totalbytes;
483
484 dir->namelen = strlen(filename);
485 dir->filetype = FILETYPE_REG; /* regular file */
486 temp_dir = (char *)dir;
487 temp_dir = temp_dir + sizeof(struct ext2_dirent);
488 memcpy(temp_dir, filename, strlen(filename));
489
490 *p_ino = inodeno;
491
492 /* update or write the 1st block of root inode */
493 if (ext4fs_put_metadata(root_first_block_buffer,
494 first_block_no_of_root))
495 goto fail;
496
497 fail:
498 free(zero_buffer);
499 free(root_first_block_buffer);
500 }
501
502 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
503 {
504 int status;
505 int inodeno;
506 int totalbytes;
507 int templength;
508 int direct_blk_idx;
509 long int blknr;
510 int found = 0;
511 char *ptr = NULL;
512 unsigned char *block_buffer = NULL;
513 struct ext2_dirent *dir = NULL;
514 struct ext2_dirent *previous_dir = NULL;
515 struct ext_filesystem *fs = get_fs();
516
517 /* read the block no allocated to a file */
518 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
519 direct_blk_idx++) {
520 blknr = read_allocated_block(parent_inode, direct_blk_idx);
521 if (blknr == 0)
522 goto fail;
523
524 /* read the blocks of parenet inode */
525 block_buffer = zalloc(fs->blksz);
526 if (!block_buffer)
527 goto fail;
528
529 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
530 0, fs->blksz, (char *)block_buffer);
531 if (status == 0)
532 goto fail;
533
534 dir = (struct ext2_dirent *)block_buffer;
535 ptr = (char *)dir;
536 totalbytes = 0;
537 while (dir->direntlen >= 0) {
538 /*
539 * blocksize-totalbytes because last directory
540 * length i.e.,*dir->direntlen is free availble
541 * space in the block that means
542 * it is a last entry of directory entry
543 */
544 if (strlen(dirname) == dir->namelen) {
545 if (strncmp(dirname, ptr +
546 sizeof(struct ext2_dirent),
547 dir->namelen) == 0) {
548 previous_dir->direntlen +=
549 dir->direntlen;
550 inodeno = dir->inode;
551 dir->inode = 0;
552 found = 1;
553 break;
554 }
555 }
556
557 if (fs->blksz - totalbytes == dir->direntlen)
558 break;
559
560 /* traversing the each directory entry */
561 templength = dir->direntlen;
562 totalbytes = totalbytes + templength;
563 previous_dir = dir;
564 dir = (struct ext2_dirent *)((char *)dir + templength);
565 ptr = (char *)dir;
566 }
567
568 if (found == 1) {
569 free(block_buffer);
570 block_buffer = NULL;
571 return inodeno;
572 }
573
574 free(block_buffer);
575 block_buffer = NULL;
576 }
577
578 fail:
579 free(block_buffer);
580
581 return -1;
582 }
583
584 static int find_dir_depth(char *dirname)
585 {
586 char *token = strtok(dirname, "/");
587 int count = 0;
588 while (token != NULL) {
589 token = strtok(NULL, "/");
590 count++;
591 }
592 return count + 1 + 1;
593 /*
594 * for example for string /home/temp
595 * depth=home(1)+temp(1)+1 extra for NULL;
596 * so count is 4;
597 */
598 }
599
600 static int parse_path(char **arr, char *dirname)
601 {
602 char *token = strtok(dirname, "/");
603 int i = 0;
604
605 /* add root */
606 arr[i] = zalloc(strlen("/") + 1);
607 if (!arr[i])
608 return -ENOMEM;
609 memcpy(arr[i++], "/", strlen("/"));
610
611 /* add each path entry after root */
612 while (token != NULL) {
613 arr[i] = zalloc(strlen(token) + 1);
614 if (!arr[i])
615 return -ENOMEM;
616 memcpy(arr[i++], token, strlen(token));
617 token = strtok(NULL, "/");
618 }
619 arr[i] = NULL;
620
621 return 0;
622 }
623
624 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
625 {
626 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
627 return -1;
628
629 return 0;
630 }
631
632 /*
633 * Function: ext4fs_get_parent_inode_num
634 * Return Value: inode Number of the parent directory of file/Directory to be
635 * created
636 * dirname : Input parmater, input path name of the file/directory to be created
637 * dname : Output parameter, to be filled with the name of the directory
638 * extracted from dirname
639 */
640 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
641 {
642 int i;
643 int depth = 0;
644 int matched_inode_no;
645 int result_inode_no = -1;
646 char **ptr = NULL;
647 char *depth_dirname = NULL;
648 char *parse_dirname = NULL;
649 struct ext2_inode *parent_inode = NULL;
650 struct ext2_inode *first_inode = NULL;
651 struct ext2_inode temp_inode;
652
653 if (*dirname != '/') {
654 printf("Please supply Absolute path\n");
655 return -1;
656 }
657
658 /* TODO: input validation make equivalent to linux */
659 depth_dirname = zalloc(strlen(dirname) + 1);
660 if (!depth_dirname)
661 return -ENOMEM;
662
663 memcpy(depth_dirname, dirname, strlen(dirname));
664 depth = find_dir_depth(depth_dirname);
665 parse_dirname = zalloc(strlen(dirname) + 1);
666 if (!parse_dirname)
667 goto fail;
668 memcpy(parse_dirname, dirname, strlen(dirname));
669
670 /* allocate memory for each directory level */
671 ptr = zalloc((depth) * sizeof(char *));
672 if (!ptr)
673 goto fail;
674 if (parse_path(ptr, parse_dirname))
675 goto fail;
676 parent_inode = zalloc(sizeof(struct ext2_inode));
677 if (!parent_inode)
678 goto fail;
679 first_inode = zalloc(sizeof(struct ext2_inode));
680 if (!first_inode)
681 goto fail;
682 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
683 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
684 if (flags & F_FILE)
685 result_inode_no = EXT2_ROOT_INO;
686 for (i = 1; i < depth; i++) {
687 matched_inode_no = search_dir(parent_inode, ptr[i]);
688 if (matched_inode_no == -1) {
689 if (ptr[i + 1] == NULL && i == 1) {
690 result_inode_no = EXT2_ROOT_INO;
691 goto end;
692 } else {
693 if (ptr[i + 1] == NULL)
694 break;
695 printf("Invalid path\n");
696 result_inode_no = -1;
697 goto fail;
698 }
699 } else {
700 if (ptr[i + 1] != NULL) {
701 memset(parent_inode, '\0',
702 sizeof(struct ext2_inode));
703 if (ext4fs_iget(matched_inode_no,
704 parent_inode)) {
705 result_inode_no = -1;
706 goto fail;
707 }
708 result_inode_no = matched_inode_no;
709 } else {
710 break;
711 }
712 }
713 }
714
715 end:
716 if (i == 1)
717 matched_inode_no = search_dir(first_inode, ptr[i]);
718 else
719 matched_inode_no = search_dir(parent_inode, ptr[i]);
720
721 if (matched_inode_no != -1) {
722 ext4fs_iget(matched_inode_no, &temp_inode);
723 if (temp_inode.mode & S_IFDIR) {
724 printf("It is a Directory\n");
725 result_inode_no = -1;
726 goto fail;
727 }
728 }
729
730 if (strlen(ptr[i]) > 256) {
731 result_inode_no = -1;
732 goto fail;
733 }
734 memcpy(dname, ptr[i], strlen(ptr[i]));
735
736 fail:
737 free(depth_dirname);
738 free(parse_dirname);
739 for (i = 0; i < depth; i++) {
740 if (!ptr[i])
741 break;
742 free(ptr[i]);
743 }
744 free(ptr);
745 free(parent_inode);
746 free(first_inode);
747
748 return result_inode_no;
749 }
750
751 static int check_filename(char *filename, unsigned int blknr)
752 {
753 unsigned int first_block_no_of_root;
754 int totalbytes = 0;
755 int templength = 0;
756 int status, inodeno;
757 int found = 0;
758 char *root_first_block_buffer = NULL;
759 char *root_first_block_addr = NULL;
760 struct ext2_dirent *dir = NULL;
761 struct ext2_dirent *previous_dir = NULL;
762 char *ptr = NULL;
763 struct ext_filesystem *fs = get_fs();
764 int ret = -1;
765
766 /* get the first block of root */
767 first_block_no_of_root = blknr;
768 root_first_block_buffer = zalloc(fs->blksz);
769 if (!root_first_block_buffer)
770 return -ENOMEM;
771 root_first_block_addr = root_first_block_buffer;
772 status = ext4fs_devread((lbaint_t)first_block_no_of_root *
773 fs->sect_perblk, 0,
774 fs->blksz, root_first_block_buffer);
775 if (status == 0)
776 goto fail;
777
778 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
779 goto fail;
780 dir = (struct ext2_dirent *)root_first_block_buffer;
781 ptr = (char *)dir;
782 totalbytes = 0;
783 while (dir->direntlen >= 0) {
784 /*
785 * blocksize-totalbytes because last
786 * directory length i.e., *dir->direntlen
787 * is free availble space in the block that
788 * means it is a last entry of directory entry
789 */
790 if (strlen(filename) == dir->namelen) {
791 if (strncmp(filename, ptr + sizeof(struct ext2_dirent),
792 dir->namelen) == 0) {
793 printf("file found deleting\n");
794 previous_dir->direntlen += dir->direntlen;
795 inodeno = dir->inode;
796 dir->inode = 0;
797 found = 1;
798 break;
799 }
800 }
801
802 if (fs->blksz - totalbytes == dir->direntlen)
803 break;
804
805 /* traversing the each directory entry */
806 templength = dir->direntlen;
807 totalbytes = totalbytes + templength;
808 previous_dir = dir;
809 dir = (struct ext2_dirent *)((char *)dir + templength);
810 ptr = (char *)dir;
811 }
812
813
814 if (found == 1) {
815 if (ext4fs_put_metadata(root_first_block_addr,
816 first_block_no_of_root))
817 goto fail;
818 ret = inodeno;
819 }
820 fail:
821 free(root_first_block_buffer);
822
823 return ret;
824 }
825
826 int ext4fs_filename_check(char *filename)
827 {
828 short direct_blk_idx = 0;
829 long int blknr = -1;
830 int inodeno = -1;
831
832 /* read the block no allocated to a file */
833 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
834 direct_blk_idx++) {
835 blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
836 if (blknr == 0)
837 break;
838 inodeno = check_filename(filename, blknr);
839 if (inodeno != -1)
840 return inodeno;
841 }
842
843 return -1;
844 }
845
846 long int ext4fs_get_new_blk_no(void)
847 {
848 short i;
849 short status;
850 int remainder;
851 unsigned int bg_idx;
852 static int prev_bg_bitmap_index = -1;
853 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
854 struct ext_filesystem *fs = get_fs();
855 char *journal_buffer = zalloc(fs->blksz);
856 char *zero_buffer = zalloc(fs->blksz);
857 if (!journal_buffer || !zero_buffer)
858 goto fail;
859 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
860
861 if (fs->first_pass_bbmap == 0) {
862 for (i = 0; i < fs->no_blkgrp; i++) {
863 if (bgd[i].free_blocks) {
864 if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) {
865 put_ext4(((uint64_t) ((uint64_t)bgd[i].block_id *
866 (uint64_t)fs->blksz)),
867 zero_buffer, fs->blksz);
868 bgd[i].bg_flags =
869 bgd[i].
870 bg_flags & ~EXT4_BG_BLOCK_UNINIT;
871 memcpy(fs->blk_bmaps[i], zero_buffer,
872 fs->blksz);
873 }
874 fs->curr_blkno =
875 _get_new_blk_no(fs->blk_bmaps[i]);
876 if (fs->curr_blkno == -1)
877 /* if block bitmap is completely fill */
878 continue;
879 fs->curr_blkno = fs->curr_blkno +
880 (i * fs->blksz * 8);
881 fs->first_pass_bbmap++;
882 bgd[i].free_blocks--;
883 fs->sb->free_blocks--;
884 status = ext4fs_devread((lbaint_t)
885 bgd[i].block_id *
886 fs->sect_perblk, 0,
887 fs->blksz,
888 journal_buffer);
889 if (status == 0)
890 goto fail;
891 if (ext4fs_log_journal(journal_buffer,
892 bgd[i].block_id))
893 goto fail;
894 goto success;
895 } else {
896 debug("no space left on block group %d\n", i);
897 }
898 }
899
900 goto fail;
901 } else {
902 restart:
903 fs->curr_blkno++;
904 /* get the blockbitmap index respective to blockno */
905 bg_idx = fs->curr_blkno / blk_per_grp;
906 if (fs->blksz == 1024) {
907 remainder = fs->curr_blkno % blk_per_grp;
908 if (!remainder)
909 bg_idx--;
910 }
911
912 /*
913 * To skip completely filled block group bitmaps
914 * Optimize the block allocation
915 */
916 if (bg_idx >= fs->no_blkgrp)
917 goto fail;
918
919 if (bgd[bg_idx].free_blocks == 0) {
920 debug("block group %u is full. Skipping\n", bg_idx);
921 fs->curr_blkno = fs->curr_blkno + blk_per_grp;
922 fs->curr_blkno--;
923 goto restart;
924 }
925
926 if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
927 memset(zero_buffer, '\0', fs->blksz);
928 put_ext4(((uint64_t) ((uint64_t)bgd[bg_idx].block_id *
929 (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
930 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
931 bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags &
932 ~EXT4_BG_BLOCK_UNINIT;
933 }
934
935 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
936 bg_idx) != 0) {
937 debug("going for restart for the block no %ld %u\n",
938 fs->curr_blkno, bg_idx);
939 goto restart;
940 }
941
942 /* journal backup */
943 if (prev_bg_bitmap_index != bg_idx) {
944 memset(journal_buffer, '\0', fs->blksz);
945 status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id
946 * fs->sect_perblk,
947 0, fs->blksz, journal_buffer);
948 if (status == 0)
949 goto fail;
950 if (ext4fs_log_journal(journal_buffer,
951 bgd[bg_idx].block_id))
952 goto fail;
953
954 prev_bg_bitmap_index = bg_idx;
955 }
956 bgd[bg_idx].free_blocks--;
957 fs->sb->free_blocks--;
958 goto success;
959 }
960 success:
961 free(journal_buffer);
962 free(zero_buffer);
963
964 return fs->curr_blkno;
965 fail:
966 free(journal_buffer);
967 free(zero_buffer);
968
969 return -1;
970 }
971
972 int ext4fs_get_new_inode_no(void)
973 {
974 short i;
975 short status;
976 unsigned int ibmap_idx;
977 static int prev_inode_bitmap_index = -1;
978 unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
979 struct ext_filesystem *fs = get_fs();
980 char *journal_buffer = zalloc(fs->blksz);
981 char *zero_buffer = zalloc(fs->blksz);
982 if (!journal_buffer || !zero_buffer)
983 goto fail;
984 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
985
986 if (fs->first_pass_ibmap == 0) {
987 for (i = 0; i < fs->no_blkgrp; i++) {
988 if (bgd[i].free_inodes) {
989 if (bgd[i].bg_itable_unused !=
990 bgd[i].free_inodes)
991 bgd[i].bg_itable_unused =
992 bgd[i].free_inodes;
993 if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
994 put_ext4(((uint64_t)
995 ((uint64_t)bgd[i].inode_id *
996 (uint64_t)fs->blksz)),
997 zero_buffer, fs->blksz);
998 bgd[i].bg_flags = bgd[i].bg_flags &
999 ~EXT4_BG_INODE_UNINIT;
1000 memcpy(fs->inode_bmaps[i],
1001 zero_buffer, fs->blksz);
1002 }
1003 fs->curr_inode_no =
1004 _get_new_inode_no(fs->inode_bmaps[i]);
1005 if (fs->curr_inode_no == -1)
1006 /* if block bitmap is completely fill */
1007 continue;
1008 fs->curr_inode_no = fs->curr_inode_no +
1009 (i * inodes_per_grp);
1010 fs->first_pass_ibmap++;
1011 bgd[i].free_inodes--;
1012 bgd[i].bg_itable_unused--;
1013 fs->sb->free_inodes--;
1014 status = ext4fs_devread((lbaint_t)
1015 bgd[i].inode_id *
1016 fs->sect_perblk, 0,
1017 fs->blksz,
1018 journal_buffer);
1019 if (status == 0)
1020 goto fail;
1021 if (ext4fs_log_journal(journal_buffer,
1022 bgd[i].inode_id))
1023 goto fail;
1024 goto success;
1025 } else
1026 debug("no inode left on block group %d\n", i);
1027 }
1028 goto fail;
1029 } else {
1030 restart:
1031 fs->curr_inode_no++;
1032 /* get the blockbitmap index respective to blockno */
1033 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1034 if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
1035 memset(zero_buffer, '\0', fs->blksz);
1036 put_ext4(((uint64_t) ((uint64_t)bgd[ibmap_idx].inode_id *
1037 (uint64_t)fs->blksz)), zero_buffer,
1038 fs->blksz);
1039 bgd[ibmap_idx].bg_flags =
1040 bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
1041 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1042 fs->blksz);
1043 }
1044
1045 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1046 fs->inode_bmaps[ibmap_idx],
1047 ibmap_idx) != 0) {
1048 debug("going for restart for the block no %d %u\n",
1049 fs->curr_inode_no, ibmap_idx);
1050 goto restart;
1051 }
1052
1053 /* journal backup */
1054 if (prev_inode_bitmap_index != ibmap_idx) {
1055 memset(journal_buffer, '\0', fs->blksz);
1056 status = ext4fs_devread((lbaint_t)
1057 bgd[ibmap_idx].inode_id
1058 * fs->sect_perblk,
1059 0, fs->blksz, journal_buffer);
1060 if (status == 0)
1061 goto fail;
1062 if (ext4fs_log_journal(journal_buffer,
1063 bgd[ibmap_idx].inode_id))
1064 goto fail;
1065 prev_inode_bitmap_index = ibmap_idx;
1066 }
1067 if (bgd[ibmap_idx].bg_itable_unused !=
1068 bgd[ibmap_idx].free_inodes)
1069 bgd[ibmap_idx].bg_itable_unused =
1070 bgd[ibmap_idx].free_inodes;
1071 bgd[ibmap_idx].free_inodes--;
1072 bgd[ibmap_idx].bg_itable_unused--;
1073 fs->sb->free_inodes--;
1074 goto success;
1075 }
1076
1077 success:
1078 free(journal_buffer);
1079 free(zero_buffer);
1080
1081 return fs->curr_inode_no;
1082 fail:
1083 free(journal_buffer);
1084 free(zero_buffer);
1085
1086 return -1;
1087
1088 }
1089
1090
1091 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1092 unsigned int *total_remaining_blocks,
1093 unsigned int *no_blks_reqd)
1094 {
1095 short i;
1096 short status;
1097 long int actual_block_no;
1098 long int si_blockno;
1099 /* si :single indirect */
1100 unsigned int *si_buffer = NULL;
1101 unsigned int *si_start_addr = NULL;
1102 struct ext_filesystem *fs = get_fs();
1103
1104 if (*total_remaining_blocks != 0) {
1105 si_buffer = zalloc(fs->blksz);
1106 if (!si_buffer) {
1107 printf("No Memory\n");
1108 return;
1109 }
1110 si_start_addr = si_buffer;
1111 si_blockno = ext4fs_get_new_blk_no();
1112 if (si_blockno == -1) {
1113 printf("no block left to assign\n");
1114 goto fail;
1115 }
1116 (*no_blks_reqd)++;
1117 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1118
1119 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1120 0, fs->blksz, (char *)si_buffer);
1121 memset(si_buffer, '\0', fs->blksz);
1122 if (status == 0)
1123 goto fail;
1124
1125 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1126 actual_block_no = ext4fs_get_new_blk_no();
1127 if (actual_block_no == -1) {
1128 printf("no block left to assign\n");
1129 goto fail;
1130 }
1131 *si_buffer = actual_block_no;
1132 debug("SIAB %u: %u\n", *si_buffer,
1133 *total_remaining_blocks);
1134
1135 si_buffer++;
1136 (*total_remaining_blocks)--;
1137 if (*total_remaining_blocks == 0)
1138 break;
1139 }
1140
1141 /* write the block to disk */
1142 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1143 si_start_addr, fs->blksz);
1144 file_inode->b.blocks.indir_block = si_blockno;
1145 }
1146 fail:
1147 free(si_start_addr);
1148 }
1149
1150 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1151 unsigned int *total_remaining_blocks,
1152 unsigned int *no_blks_reqd)
1153 {
1154 short i;
1155 short j;
1156 short status;
1157 long int actual_block_no;
1158 /* di:double indirect */
1159 long int di_blockno_parent;
1160 long int di_blockno_child;
1161 unsigned int *di_parent_buffer = NULL;
1162 unsigned int *di_child_buff = NULL;
1163 unsigned int *di_block_start_addr = NULL;
1164 unsigned int *di_child_buff_start = NULL;
1165 struct ext_filesystem *fs = get_fs();
1166
1167 if (*total_remaining_blocks != 0) {
1168 /* double indirect parent block connecting to inode */
1169 di_blockno_parent = ext4fs_get_new_blk_no();
1170 if (di_blockno_parent == -1) {
1171 printf("no block left to assign\n");
1172 goto fail;
1173 }
1174 di_parent_buffer = zalloc(fs->blksz);
1175 if (!di_parent_buffer)
1176 goto fail;
1177
1178 di_block_start_addr = di_parent_buffer;
1179 (*no_blks_reqd)++;
1180 debug("DIPB %ld: %u\n", di_blockno_parent,
1181 *total_remaining_blocks);
1182
1183 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1184 fs->sect_perblk, 0,
1185 fs->blksz, (char *)di_parent_buffer);
1186
1187 if (!status) {
1188 printf("%s: Device read error!\n", __func__);
1189 goto fail;
1190 }
1191 memset(di_parent_buffer, '\0', fs->blksz);
1192
1193 /*
1194 * start:for each double indirect parent
1195 * block create one more block
1196 */
1197 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1198 di_blockno_child = ext4fs_get_new_blk_no();
1199 if (di_blockno_child == -1) {
1200 printf("no block left to assign\n");
1201 goto fail;
1202 }
1203 di_child_buff = zalloc(fs->blksz);
1204 if (!di_child_buff)
1205 goto fail;
1206
1207 di_child_buff_start = di_child_buff;
1208 *di_parent_buffer = di_blockno_child;
1209 di_parent_buffer++;
1210 (*no_blks_reqd)++;
1211 debug("DICB %ld: %u\n", di_blockno_child,
1212 *total_remaining_blocks);
1213
1214 status = ext4fs_devread((lbaint_t)di_blockno_child *
1215 fs->sect_perblk, 0,
1216 fs->blksz,
1217 (char *)di_child_buff);
1218
1219 if (!status) {
1220 printf("%s: Device read error!\n", __func__);
1221 goto fail;
1222 }
1223 memset(di_child_buff, '\0', fs->blksz);
1224 /* filling of actual datablocks for each child */
1225 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1226 actual_block_no = ext4fs_get_new_blk_no();
1227 if (actual_block_no == -1) {
1228 printf("no block left to assign\n");
1229 goto fail;
1230 }
1231 *di_child_buff = actual_block_no;
1232 debug("DIAB %ld: %u\n", actual_block_no,
1233 *total_remaining_blocks);
1234
1235 di_child_buff++;
1236 (*total_remaining_blocks)--;
1237 if (*total_remaining_blocks == 0)
1238 break;
1239 }
1240 /* write the block table */
1241 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1242 di_child_buff_start, fs->blksz);
1243 free(di_child_buff_start);
1244 di_child_buff_start = NULL;
1245
1246 if (*total_remaining_blocks == 0)
1247 break;
1248 }
1249 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1250 di_block_start_addr, fs->blksz);
1251 file_inode->b.blocks.double_indir_block = di_blockno_parent;
1252 }
1253 fail:
1254 free(di_block_start_addr);
1255 }
1256
1257 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1258 unsigned int *total_remaining_blocks,
1259 unsigned int *no_blks_reqd)
1260 {
1261 short i;
1262 short j;
1263 short k;
1264 long int actual_block_no;
1265 /* ti: Triple Indirect */
1266 long int ti_gp_blockno;
1267 long int ti_parent_blockno;
1268 long int ti_child_blockno;
1269 unsigned int *ti_gp_buff = NULL;
1270 unsigned int *ti_parent_buff = NULL;
1271 unsigned int *ti_child_buff = NULL;
1272 unsigned int *ti_gp_buff_start_addr = NULL;
1273 unsigned int *ti_pbuff_start_addr = NULL;
1274 unsigned int *ti_cbuff_start_addr = NULL;
1275 struct ext_filesystem *fs = get_fs();
1276 if (*total_remaining_blocks != 0) {
1277 /* triple indirect grand parent block connecting to inode */
1278 ti_gp_blockno = ext4fs_get_new_blk_no();
1279 if (ti_gp_blockno == -1) {
1280 printf("no block left to assign\n");
1281 return;
1282 }
1283 ti_gp_buff = zalloc(fs->blksz);
1284 if (!ti_gp_buff)
1285 return;
1286
1287 ti_gp_buff_start_addr = ti_gp_buff;
1288 (*no_blks_reqd)++;
1289 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1290 *total_remaining_blocks);
1291
1292 /* for each 4 byte grand parent entry create one more block */
1293 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1294 ti_parent_blockno = ext4fs_get_new_blk_no();
1295 if (ti_parent_blockno == -1) {
1296 printf("no block left to assign\n");
1297 goto fail;
1298 }
1299 ti_parent_buff = zalloc(fs->blksz);
1300 if (!ti_parent_buff)
1301 goto fail;
1302
1303 ti_pbuff_start_addr = ti_parent_buff;
1304 *ti_gp_buff = ti_parent_blockno;
1305 ti_gp_buff++;
1306 (*no_blks_reqd)++;
1307 debug("TIPB %ld: %u\n", ti_parent_blockno,
1308 *total_remaining_blocks);
1309
1310 /* for each 4 byte entry parent create one more block */
1311 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1312 ti_child_blockno = ext4fs_get_new_blk_no();
1313 if (ti_child_blockno == -1) {
1314 printf("no block left assign\n");
1315 goto fail1;
1316 }
1317 ti_child_buff = zalloc(fs->blksz);
1318 if (!ti_child_buff)
1319 goto fail1;
1320
1321 ti_cbuff_start_addr = ti_child_buff;
1322 *ti_parent_buff = ti_child_blockno;
1323 ti_parent_buff++;
1324 (*no_blks_reqd)++;
1325 debug("TICB %ld: %u\n", ti_parent_blockno,
1326 *total_remaining_blocks);
1327
1328 /* fill actual datablocks for each child */
1329 for (k = 0; k < (fs->blksz / sizeof(int));
1330 k++) {
1331 actual_block_no =
1332 ext4fs_get_new_blk_no();
1333 if (actual_block_no == -1) {
1334 printf("no block left\n");
1335 free(ti_cbuff_start_addr);
1336 goto fail1;
1337 }
1338 *ti_child_buff = actual_block_no;
1339 debug("TIAB %ld: %u\n", actual_block_no,
1340 *total_remaining_blocks);
1341
1342 ti_child_buff++;
1343 (*total_remaining_blocks)--;
1344 if (*total_remaining_blocks == 0)
1345 break;
1346 }
1347 /* write the child block */
1348 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1349 (uint64_t)fs->blksz)),
1350 ti_cbuff_start_addr, fs->blksz);
1351 free(ti_cbuff_start_addr);
1352
1353 if (*total_remaining_blocks == 0)
1354 break;
1355 }
1356 /* write the parent block */
1357 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1358 ti_pbuff_start_addr, fs->blksz);
1359 free(ti_pbuff_start_addr);
1360
1361 if (*total_remaining_blocks == 0)
1362 break;
1363 }
1364 /* write the grand parent block */
1365 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1366 ti_gp_buff_start_addr, fs->blksz);
1367 file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
1368 free(ti_gp_buff_start_addr);
1369 return;
1370 }
1371 fail1:
1372 free(ti_pbuff_start_addr);
1373 fail:
1374 free(ti_gp_buff_start_addr);
1375 }
1376
1377 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1378 unsigned int total_remaining_blocks,
1379 unsigned int *total_no_of_block)
1380 {
1381 short i;
1382 long int direct_blockno;
1383 unsigned int no_blks_reqd = 0;
1384
1385 /* allocation of direct blocks */
1386 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1387 direct_blockno = ext4fs_get_new_blk_no();
1388 if (direct_blockno == -1) {
1389 printf("no block left to assign\n");
1390 return;
1391 }
1392 file_inode->b.blocks.dir_blocks[i] = direct_blockno;
1393 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1394
1395 total_remaining_blocks--;
1396 }
1397
1398 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1399 &no_blks_reqd);
1400 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1401 &no_blks_reqd);
1402 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1403 &no_blks_reqd);
1404 *total_no_of_block += no_blks_reqd;
1405 }
1406
1407 #endif
1408
1409 static struct ext4_extent_header *ext4fs_get_extent_block
1410 (struct ext2_data *data, char *buf,
1411 struct ext4_extent_header *ext_block,
1412 uint32_t fileblock, int log2_blksz)
1413 {
1414 struct ext4_extent_idx *index;
1415 unsigned long long block;
1416 int blksz = EXT2_BLOCK_SIZE(data);
1417 int i;
1418
1419 while (1) {
1420 index = (struct ext4_extent_idx *)(ext_block + 1);
1421
1422 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1423 return 0;
1424
1425 if (ext_block->eh_depth == 0)
1426 return ext_block;
1427 i = -1;
1428 do {
1429 i++;
1430 if (i >= le16_to_cpu(ext_block->eh_entries))
1431 break;
1432 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1433
1434 if (--i < 0)
1435 return 0;
1436
1437 block = le16_to_cpu(index[i].ei_leaf_hi);
1438 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1439
1440 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1441 buf))
1442 ext_block = (struct ext4_extent_header *)buf;
1443 else
1444 return 0;
1445 }
1446 }
1447
1448 static int ext4fs_blockgroup
1449 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1450 {
1451 long int blkno;
1452 unsigned int blkoff, desc_per_blk;
1453 int log2blksz = get_fs()->dev_desc->log2blksz;
1454
1455 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1456
1457 blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1458 group / desc_per_blk;
1459 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1460
1461 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1462 group, blkno, blkoff);
1463
1464 return ext4fs_devread((lbaint_t)blkno <<
1465 (LOG2_BLOCK_SIZE(data) - log2blksz),
1466 blkoff, sizeof(struct ext2_block_group),
1467 (char *)blkgrp);
1468 }
1469
1470 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1471 {
1472 struct ext2_block_group blkgrp;
1473 struct ext2_sblock *sblock = &data->sblock;
1474 struct ext_filesystem *fs = get_fs();
1475 int log2blksz = get_fs()->dev_desc->log2blksz;
1476 int inodes_per_block, status;
1477 long int blkno;
1478 unsigned int blkoff;
1479
1480 /* It is easier to calculate if the first inode is 0. */
1481 ino--;
1482 status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1483 (sblock->inodes_per_group), &blkgrp);
1484 if (status == 0)
1485 return 0;
1486
1487 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1488 blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1489 (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1490 blkoff = (ino % inodes_per_block) * fs->inodesz;
1491 /* Read the inode. */
1492 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1493 log2blksz), blkoff,
1494 sizeof(struct ext2_inode), (char *)inode);
1495 if (status == 0)
1496 return 0;
1497
1498 return 1;
1499 }
1500
1501 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1502 {
1503 long int blknr;
1504 int blksz;
1505 int log2_blksz;
1506 int status;
1507 long int rblock;
1508 long int perblock_parent;
1509 long int perblock_child;
1510 unsigned long long start;
1511 /* get the blocksize of the filesystem */
1512 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1513 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1514 - get_fs()->dev_desc->log2blksz;
1515
1516 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1517 char *buf = zalloc(blksz);
1518 if (!buf)
1519 return -ENOMEM;
1520 struct ext4_extent_header *ext_block;
1521 struct ext4_extent *extent;
1522 int i = -1;
1523 ext_block =
1524 ext4fs_get_extent_block(ext4fs_root, buf,
1525 (struct ext4_extent_header *)
1526 inode->b.blocks.dir_blocks,
1527 fileblock, log2_blksz);
1528 if (!ext_block) {
1529 printf("invalid extent block\n");
1530 free(buf);
1531 return -EINVAL;
1532 }
1533
1534 extent = (struct ext4_extent *)(ext_block + 1);
1535
1536 do {
1537 i++;
1538 if (i >= le16_to_cpu(ext_block->eh_entries))
1539 break;
1540 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1541 if (--i >= 0) {
1542 fileblock -= le32_to_cpu(extent[i].ee_block);
1543 if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1544 free(buf);
1545 return 0;
1546 }
1547
1548 start = le16_to_cpu(extent[i].ee_start_hi);
1549 start = (start << 32) +
1550 le32_to_cpu(extent[i].ee_start_lo);
1551 free(buf);
1552 return fileblock + start;
1553 }
1554
1555 printf("Extent Error\n");
1556 free(buf);
1557 return -1;
1558 }
1559
1560 /* Direct blocks. */
1561 if (fileblock < INDIRECT_BLOCKS)
1562 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1563
1564 /* Indirect. */
1565 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1566 if (ext4fs_indir1_block == NULL) {
1567 ext4fs_indir1_block = zalloc(blksz);
1568 if (ext4fs_indir1_block == NULL) {
1569 printf("** SI ext2fs read block (indir 1)"
1570 "malloc failed. **\n");
1571 return -1;
1572 }
1573 ext4fs_indir1_size = blksz;
1574 ext4fs_indir1_blkno = -1;
1575 }
1576 if (blksz != ext4fs_indir1_size) {
1577 free(ext4fs_indir1_block);
1578 ext4fs_indir1_block = NULL;
1579 ext4fs_indir1_size = 0;
1580 ext4fs_indir1_blkno = -1;
1581 ext4fs_indir1_block = zalloc(blksz);
1582 if (ext4fs_indir1_block == NULL) {
1583 printf("** SI ext2fs read block (indir 1):"
1584 "malloc failed. **\n");
1585 return -1;
1586 }
1587 ext4fs_indir1_size = blksz;
1588 }
1589 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1590 log2_blksz) != ext4fs_indir1_blkno) {
1591 status =
1592 ext4fs_devread((lbaint_t)__le32_to_cpu
1593 (inode->b.blocks.
1594 indir_block) << log2_blksz, 0,
1595 blksz, (char *)ext4fs_indir1_block);
1596 if (status == 0) {
1597 printf("** SI ext2fs read block (indir 1)"
1598 "failed. **\n");
1599 return 0;
1600 }
1601 ext4fs_indir1_blkno =
1602 __le32_to_cpu(inode->b.blocks.
1603 indir_block) << log2_blksz;
1604 }
1605 blknr = __le32_to_cpu(ext4fs_indir1_block
1606 [fileblock - INDIRECT_BLOCKS]);
1607 }
1608 /* Double indirect. */
1609 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1610 (blksz / 4 + 1)))) {
1611
1612 long int perblock = blksz / 4;
1613 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1614
1615 if (ext4fs_indir1_block == NULL) {
1616 ext4fs_indir1_block = zalloc(blksz);
1617 if (ext4fs_indir1_block == NULL) {
1618 printf("** DI ext2fs read block (indir 2 1)"
1619 "malloc failed. **\n");
1620 return -1;
1621 }
1622 ext4fs_indir1_size = blksz;
1623 ext4fs_indir1_blkno = -1;
1624 }
1625 if (blksz != ext4fs_indir1_size) {
1626 free(ext4fs_indir1_block);
1627 ext4fs_indir1_block = NULL;
1628 ext4fs_indir1_size = 0;
1629 ext4fs_indir1_blkno = -1;
1630 ext4fs_indir1_block = zalloc(blksz);
1631 if (ext4fs_indir1_block == NULL) {
1632 printf("** DI ext2fs read block (indir 2 1)"
1633 "malloc failed. **\n");
1634 return -1;
1635 }
1636 ext4fs_indir1_size = blksz;
1637 }
1638 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1639 log2_blksz) != ext4fs_indir1_blkno) {
1640 status =
1641 ext4fs_devread((lbaint_t)__le32_to_cpu
1642 (inode->b.blocks.
1643 double_indir_block) << log2_blksz,
1644 0, blksz,
1645 (char *)ext4fs_indir1_block);
1646 if (status == 0) {
1647 printf("** DI ext2fs read block (indir 2 1)"
1648 "failed. **\n");
1649 return -1;
1650 }
1651 ext4fs_indir1_blkno =
1652 __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1653 log2_blksz;
1654 }
1655
1656 if (ext4fs_indir2_block == NULL) {
1657 ext4fs_indir2_block = zalloc(blksz);
1658 if (ext4fs_indir2_block == NULL) {
1659 printf("** DI ext2fs read block (indir 2 2)"
1660 "malloc failed. **\n");
1661 return -1;
1662 }
1663 ext4fs_indir2_size = blksz;
1664 ext4fs_indir2_blkno = -1;
1665 }
1666 if (blksz != ext4fs_indir2_size) {
1667 free(ext4fs_indir2_block);
1668 ext4fs_indir2_block = NULL;
1669 ext4fs_indir2_size = 0;
1670 ext4fs_indir2_blkno = -1;
1671 ext4fs_indir2_block = zalloc(blksz);
1672 if (ext4fs_indir2_block == NULL) {
1673 printf("** DI ext2fs read block (indir 2 2)"
1674 "malloc failed. **\n");
1675 return -1;
1676 }
1677 ext4fs_indir2_size = blksz;
1678 }
1679 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1680 log2_blksz) != ext4fs_indir2_blkno) {
1681 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1682 (ext4fs_indir1_block
1683 [rblock /
1684 perblock]) << log2_blksz, 0,
1685 blksz,
1686 (char *)ext4fs_indir2_block);
1687 if (status == 0) {
1688 printf("** DI ext2fs read block (indir 2 2)"
1689 "failed. **\n");
1690 return -1;
1691 }
1692 ext4fs_indir2_blkno =
1693 __le32_to_cpu(ext4fs_indir1_block[rblock
1694 /
1695 perblock]) <<
1696 log2_blksz;
1697 }
1698 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1699 }
1700 /* Tripple indirect. */
1701 else {
1702 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1703 (blksz / 4 * blksz / 4));
1704 perblock_child = blksz / 4;
1705 perblock_parent = ((blksz / 4) * (blksz / 4));
1706
1707 if (ext4fs_indir1_block == NULL) {
1708 ext4fs_indir1_block = zalloc(blksz);
1709 if (ext4fs_indir1_block == NULL) {
1710 printf("** TI ext2fs read block (indir 2 1)"
1711 "malloc failed. **\n");
1712 return -1;
1713 }
1714 ext4fs_indir1_size = blksz;
1715 ext4fs_indir1_blkno = -1;
1716 }
1717 if (blksz != ext4fs_indir1_size) {
1718 free(ext4fs_indir1_block);
1719 ext4fs_indir1_block = NULL;
1720 ext4fs_indir1_size = 0;
1721 ext4fs_indir1_blkno = -1;
1722 ext4fs_indir1_block = zalloc(blksz);
1723 if (ext4fs_indir1_block == NULL) {
1724 printf("** TI ext2fs read block (indir 2 1)"
1725 "malloc failed. **\n");
1726 return -1;
1727 }
1728 ext4fs_indir1_size = blksz;
1729 }
1730 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1731 log2_blksz) != ext4fs_indir1_blkno) {
1732 status = ext4fs_devread
1733 ((lbaint_t)
1734 __le32_to_cpu(inode->b.blocks.triple_indir_block)
1735 << log2_blksz, 0, blksz,
1736 (char *)ext4fs_indir1_block);
1737 if (status == 0) {
1738 printf("** TI ext2fs read block (indir 2 1)"
1739 "failed. **\n");
1740 return -1;
1741 }
1742 ext4fs_indir1_blkno =
1743 __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1744 log2_blksz;
1745 }
1746
1747 if (ext4fs_indir2_block == NULL) {
1748 ext4fs_indir2_block = zalloc(blksz);
1749 if (ext4fs_indir2_block == NULL) {
1750 printf("** TI ext2fs read block (indir 2 2)"
1751 "malloc failed. **\n");
1752 return -1;
1753 }
1754 ext4fs_indir2_size = blksz;
1755 ext4fs_indir2_blkno = -1;
1756 }
1757 if (blksz != ext4fs_indir2_size) {
1758 free(ext4fs_indir2_block);
1759 ext4fs_indir2_block = NULL;
1760 ext4fs_indir2_size = 0;
1761 ext4fs_indir2_blkno = -1;
1762 ext4fs_indir2_block = zalloc(blksz);
1763 if (ext4fs_indir2_block == NULL) {
1764 printf("** TI ext2fs read block (indir 2 2)"
1765 "malloc failed. **\n");
1766 return -1;
1767 }
1768 ext4fs_indir2_size = blksz;
1769 }
1770 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1771 perblock_parent]) <<
1772 log2_blksz)
1773 != ext4fs_indir2_blkno) {
1774 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1775 (ext4fs_indir1_block
1776 [rblock /
1777 perblock_parent]) <<
1778 log2_blksz, 0, blksz,
1779 (char *)ext4fs_indir2_block);
1780 if (status == 0) {
1781 printf("** TI ext2fs read block (indir 2 2)"
1782 "failed. **\n");
1783 return -1;
1784 }
1785 ext4fs_indir2_blkno =
1786 __le32_to_cpu(ext4fs_indir1_block[rblock /
1787 perblock_parent])
1788 << log2_blksz;
1789 }
1790
1791 if (ext4fs_indir3_block == NULL) {
1792 ext4fs_indir3_block = zalloc(blksz);
1793 if (ext4fs_indir3_block == NULL) {
1794 printf("** TI ext2fs read block (indir 2 2)"
1795 "malloc failed. **\n");
1796 return -1;
1797 }
1798 ext4fs_indir3_size = blksz;
1799 ext4fs_indir3_blkno = -1;
1800 }
1801 if (blksz != ext4fs_indir3_size) {
1802 free(ext4fs_indir3_block);
1803 ext4fs_indir3_block = NULL;
1804 ext4fs_indir3_size = 0;
1805 ext4fs_indir3_blkno = -1;
1806 ext4fs_indir3_block = zalloc(blksz);
1807 if (ext4fs_indir3_block == NULL) {
1808 printf("** TI ext2fs read block (indir 2 2)"
1809 "malloc failed. **\n");
1810 return -1;
1811 }
1812 ext4fs_indir3_size = blksz;
1813 }
1814 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1815 /
1816 perblock_child]) <<
1817 log2_blksz) != ext4fs_indir3_blkno) {
1818 status =
1819 ext4fs_devread((lbaint_t)__le32_to_cpu
1820 (ext4fs_indir2_block
1821 [(rblock / perblock_child)
1822 % (blksz / 4)]) << log2_blksz, 0,
1823 blksz, (char *)ext4fs_indir3_block);
1824 if (status == 0) {
1825 printf("** TI ext2fs read block (indir 2 2)"
1826 "failed. **\n");
1827 return -1;
1828 }
1829 ext4fs_indir3_blkno =
1830 __le32_to_cpu(ext4fs_indir2_block[(rblock /
1831 perblock_child) %
1832 (blksz /
1833 4)]) <<
1834 log2_blksz;
1835 }
1836
1837 blknr = __le32_to_cpu(ext4fs_indir3_block
1838 [rblock % perblock_child]);
1839 }
1840 debug("read_allocated_block %ld\n", blknr);
1841
1842 return blknr;
1843 }
1844
1845 /**
1846 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1847 * global pointers
1848 *
1849 * This function assures that for a file with the same name but different size
1850 * the sequential store on the ext4 filesystem will be correct.
1851 *
1852 * In this function the global data, responsible for internal representation
1853 * of the ext4 data are initialized to the reset state. Without this, during
1854 * replacement of the smaller file with the bigger truncation of new file was
1855 * performed.
1856 */
1857 void ext4fs_reinit_global(void)
1858 {
1859 if (ext4fs_indir1_block != NULL) {
1860 free(ext4fs_indir1_block);
1861 ext4fs_indir1_block = NULL;
1862 ext4fs_indir1_size = 0;
1863 ext4fs_indir1_blkno = -1;
1864 }
1865 if (ext4fs_indir2_block != NULL) {
1866 free(ext4fs_indir2_block);
1867 ext4fs_indir2_block = NULL;
1868 ext4fs_indir2_size = 0;
1869 ext4fs_indir2_blkno = -1;
1870 }
1871 if (ext4fs_indir3_block != NULL) {
1872 free(ext4fs_indir3_block);
1873 ext4fs_indir3_block = NULL;
1874 ext4fs_indir3_size = 0;
1875 ext4fs_indir3_blkno = -1;
1876 }
1877 }
1878 void ext4fs_close(void)
1879 {
1880 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1881 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1882 ext4fs_file = NULL;
1883 }
1884 if (ext4fs_root != NULL) {
1885 free(ext4fs_root);
1886 ext4fs_root = NULL;
1887 }
1888
1889 ext4fs_reinit_global();
1890 }
1891
1892 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1893 struct ext2fs_node **fnode, int *ftype)
1894 {
1895 unsigned int fpos = 0;
1896 int status;
1897 loff_t actread;
1898 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1899
1900 #ifdef DEBUG
1901 if (name != NULL)
1902 printf("Iterate dir %s\n", name);
1903 #endif /* of DEBUG */
1904 if (!diro->inode_read) {
1905 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1906 if (status == 0)
1907 return 0;
1908 }
1909 /* Search the file. */
1910 while (fpos < __le32_to_cpu(diro->inode.size)) {
1911 struct ext2_dirent dirent;
1912
1913 status = ext4fs_read_file(diro, fpos,
1914 sizeof(struct ext2_dirent),
1915 (char *)&dirent, &actread);
1916 if (status < 0)
1917 return 0;
1918
1919 if (dirent.direntlen == 0) {
1920 printf("Failed to iterate over directory %s\n", name);
1921 return 0;
1922 }
1923
1924 if (dirent.namelen != 0) {
1925 char filename[dirent.namelen + 1];
1926 struct ext2fs_node *fdiro;
1927 int type = FILETYPE_UNKNOWN;
1928
1929 status = ext4fs_read_file(diro,
1930 fpos +
1931 sizeof(struct ext2_dirent),
1932 dirent.namelen, filename,
1933 &actread);
1934 if (status < 0)
1935 return 0;
1936
1937 fdiro = zalloc(sizeof(struct ext2fs_node));
1938 if (!fdiro)
1939 return 0;
1940
1941 fdiro->data = diro->data;
1942 fdiro->ino = __le32_to_cpu(dirent.inode);
1943
1944 filename[dirent.namelen] = '\0';
1945
1946 if (dirent.filetype != FILETYPE_UNKNOWN) {
1947 fdiro->inode_read = 0;
1948
1949 if (dirent.filetype == FILETYPE_DIRECTORY)
1950 type = FILETYPE_DIRECTORY;
1951 else if (dirent.filetype == FILETYPE_SYMLINK)
1952 type = FILETYPE_SYMLINK;
1953 else if (dirent.filetype == FILETYPE_REG)
1954 type = FILETYPE_REG;
1955 } else {
1956 status = ext4fs_read_inode(diro->data,
1957 __le32_to_cpu
1958 (dirent.inode),
1959 &fdiro->inode);
1960 if (status == 0) {
1961 free(fdiro);
1962 return 0;
1963 }
1964 fdiro->inode_read = 1;
1965
1966 if ((__le16_to_cpu(fdiro->inode.mode) &
1967 FILETYPE_INO_MASK) ==
1968 FILETYPE_INO_DIRECTORY) {
1969 type = FILETYPE_DIRECTORY;
1970 } else if ((__le16_to_cpu(fdiro->inode.mode)
1971 & FILETYPE_INO_MASK) ==
1972 FILETYPE_INO_SYMLINK) {
1973 type = FILETYPE_SYMLINK;
1974 } else if ((__le16_to_cpu(fdiro->inode.mode)
1975 & FILETYPE_INO_MASK) ==
1976 FILETYPE_INO_REG) {
1977 type = FILETYPE_REG;
1978 }
1979 }
1980 #ifdef DEBUG
1981 printf("iterate >%s<\n", filename);
1982 #endif /* of DEBUG */
1983 if ((name != NULL) && (fnode != NULL)
1984 && (ftype != NULL)) {
1985 if (strcmp(filename, name) == 0) {
1986 *ftype = type;
1987 *fnode = fdiro;
1988 return 1;
1989 }
1990 } else {
1991 if (fdiro->inode_read == 0) {
1992 status = ext4fs_read_inode(diro->data,
1993 __le32_to_cpu(
1994 dirent.inode),
1995 &fdiro->inode);
1996 if (status == 0) {
1997 free(fdiro);
1998 return 0;
1999 }
2000 fdiro->inode_read = 1;
2001 }
2002 switch (type) {
2003 case FILETYPE_DIRECTORY:
2004 printf("<DIR> ");
2005 break;
2006 case FILETYPE_SYMLINK:
2007 printf("<SYM> ");
2008 break;
2009 case FILETYPE_REG:
2010 printf(" ");
2011 break;
2012 default:
2013 printf("< ? > ");
2014 break;
2015 }
2016 printf("%10u %s\n",
2017 __le32_to_cpu(fdiro->inode.size),
2018 filename);
2019 }
2020 free(fdiro);
2021 }
2022 fpos += __le16_to_cpu(dirent.direntlen);
2023 }
2024 return 0;
2025 }
2026
2027 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2028 {
2029 char *symlink;
2030 struct ext2fs_node *diro = node;
2031 int status;
2032 loff_t actread;
2033
2034 if (!diro->inode_read) {
2035 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2036 if (status == 0)
2037 return 0;
2038 }
2039 symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2040 if (!symlink)
2041 return 0;
2042
2043 if (__le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2044 strncpy(symlink, diro->inode.b.symlink,
2045 __le32_to_cpu(diro->inode.size));
2046 } else {
2047 status = ext4fs_read_file(diro, 0,
2048 __le32_to_cpu(diro->inode.size),
2049 symlink, &actread);
2050 if ((status < 0) || (actread == 0)) {
2051 free(symlink);
2052 return 0;
2053 }
2054 }
2055 symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2056 return symlink;
2057 }
2058
2059 static int ext4fs_find_file1(const char *currpath,
2060 struct ext2fs_node *currroot,
2061 struct ext2fs_node **currfound, int *foundtype)
2062 {
2063 char fpath[strlen(currpath) + 1];
2064 char *name = fpath;
2065 char *next;
2066 int status;
2067 int type = FILETYPE_DIRECTORY;
2068 struct ext2fs_node *currnode = currroot;
2069 struct ext2fs_node *oldnode = currroot;
2070
2071 strncpy(fpath, currpath, strlen(currpath) + 1);
2072
2073 /* Remove all leading slashes. */
2074 while (*name == '/')
2075 name++;
2076
2077 if (!*name) {
2078 *currfound = currnode;
2079 return 1;
2080 }
2081
2082 for (;;) {
2083 int found;
2084
2085 /* Extract the actual part from the pathname. */
2086 next = strchr(name, '/');
2087 if (next) {
2088 /* Remove all leading slashes. */
2089 while (*next == '/')
2090 *(next++) = '\0';
2091 }
2092
2093 if (type != FILETYPE_DIRECTORY) {
2094 ext4fs_free_node(currnode, currroot);
2095 return 0;
2096 }
2097
2098 oldnode = currnode;
2099
2100 /* Iterate over the directory. */
2101 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2102 if (found == 0)
2103 return 0;
2104
2105 if (found == -1)
2106 break;
2107
2108 /* Read in the symlink and follow it. */
2109 if (type == FILETYPE_SYMLINK) {
2110 char *symlink;
2111
2112 /* Test if the symlink does not loop. */
2113 if (++symlinknest == 8) {
2114 ext4fs_free_node(currnode, currroot);
2115 ext4fs_free_node(oldnode, currroot);
2116 return 0;
2117 }
2118
2119 symlink = ext4fs_read_symlink(currnode);
2120 ext4fs_free_node(currnode, currroot);
2121
2122 if (!symlink) {
2123 ext4fs_free_node(oldnode, currroot);
2124 return 0;
2125 }
2126
2127 debug("Got symlink >%s<\n", symlink);
2128
2129 if (symlink[0] == '/') {
2130 ext4fs_free_node(oldnode, currroot);
2131 oldnode = &ext4fs_root->diropen;
2132 }
2133
2134 /* Lookup the node the symlink points to. */
2135 status = ext4fs_find_file1(symlink, oldnode,
2136 &currnode, &type);
2137
2138 free(symlink);
2139
2140 if (status == 0) {
2141 ext4fs_free_node(oldnode, currroot);
2142 return 0;
2143 }
2144 }
2145
2146 ext4fs_free_node(oldnode, currroot);
2147
2148 /* Found the node! */
2149 if (!next || *next == '\0') {
2150 *currfound = currnode;
2151 *foundtype = type;
2152 return 1;
2153 }
2154 name = next;
2155 }
2156 return -1;
2157 }
2158
2159 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2160 struct ext2fs_node **foundnode, int expecttype)
2161 {
2162 int status;
2163 int foundtype = FILETYPE_DIRECTORY;
2164
2165 symlinknest = 0;
2166 if (!path)
2167 return 0;
2168
2169 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2170 if (status == 0)
2171 return 0;
2172
2173 /* Check if the node that was found was of the expected type. */
2174 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2175 return 0;
2176 else if ((expecttype == FILETYPE_DIRECTORY)
2177 && (foundtype != expecttype))
2178 return 0;
2179
2180 return 1;
2181 }
2182
2183 int ext4fs_open(const char *filename, loff_t *len)
2184 {
2185 struct ext2fs_node *fdiro = NULL;
2186 int status;
2187
2188 if (ext4fs_root == NULL)
2189 return -1;
2190
2191 ext4fs_file = NULL;
2192 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2193 FILETYPE_REG);
2194 if (status == 0)
2195 goto fail;
2196
2197 if (!fdiro->inode_read) {
2198 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2199 &fdiro->inode);
2200 if (status == 0)
2201 goto fail;
2202 }
2203 *len = __le32_to_cpu(fdiro->inode.size);
2204 ext4fs_file = fdiro;
2205
2206 return 0;
2207 fail:
2208 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2209
2210 return -1;
2211 }
2212
2213 int ext4fs_mount(unsigned part_length)
2214 {
2215 struct ext2_data *data;
2216 int status;
2217 struct ext_filesystem *fs = get_fs();
2218 data = zalloc(SUPERBLOCK_SIZE);
2219 if (!data)
2220 return 0;
2221
2222 /* Read the superblock. */
2223 status = ext4_read_superblock((char *)&data->sblock);
2224
2225 if (status == 0)
2226 goto fail;
2227
2228 /* Make sure this is an ext2 filesystem. */
2229 if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2230 goto fail;
2231
2232 /*
2233 * The 64bit feature was enabled when metadata_csum was enabled
2234 * and we do not support metadata_csum (and cannot reliably find
2235 * files when it is set. Refuse to mount.
2236 */
2237 if (data->sblock.feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) {
2238 printf("Unsupported feature found (64bit, possibly metadata_csum), not mounting\n");
2239 goto fail;
2240 }
2241
2242 if (__le32_to_cpu(data->sblock.revision_level == 0))
2243 fs->inodesz = 128;
2244 else
2245 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2246
2247 debug("EXT2 rev %d, inode_size %d\n",
2248 __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2249
2250 data->diropen.data = data;
2251 data->diropen.ino = 2;
2252 data->diropen.inode_read = 1;
2253 data->inode = &data->diropen.inode;
2254
2255 status = ext4fs_read_inode(data, 2, data->inode);
2256 if (status == 0)
2257 goto fail;
2258
2259 ext4fs_root = data;
2260
2261 return 1;
2262 fail:
2263 printf("Failed to mount ext2 filesystem...\n");
2264 free(data);
2265 ext4fs_root = NULL;
2266
2267 return 0;
2268 }
"Das U-Boot" Source Tree