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common: remove unaligned access error in bootmenu_getoption()
[u-boot.git] / fs / ext4 / ext4_common.c
CommitLineData
a1596438
US		 1/*
2 * (C) Copyright 2011 - 2012 Samsung Electronics
3 * EXT4 filesystem implementation in Uboot by
4 * Uma Shankar <[email protected]>
5 * Manjunatha C Achar <[email protected]>
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 <[email protected]>
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 *
ed34f34d
US		 17 * ext4write : Based on generic ext4 protocol.
18 *
a1596438
US		 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
44struct ext2_data *ext4fs_root;
45struct ext2fs_node *ext4fs_file;
46uint32_t *ext4fs_indir1_block;
47int ext4fs_indir1_size;
48int ext4fs_indir1_blkno = -1;
49uint32_t *ext4fs_indir2_block;
50int ext4fs_indir2_size;
51int ext4fs_indir2_blkno = -1;
52
53uint32_t *ext4fs_indir3_block;
54int ext4fs_indir3_size;
55int ext4fs_indir3_blkno = -1;
56struct ext2_inode *g_parent_inode;
57static int symlinknest;
58
03e2ecf6 59#if defined(CONFIG_EXT4_WRITE)
ed34f34d
US		 60uint32_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
69void 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;
ed34f34d 74 struct ext_filesystem *fs = get_fs();
50ce4c07
EE		 75 int log2blksz = fs->dev_desc->log2blksz;
76 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
ed34f34d 77
50ce4c07 78 startblock = off >> log2blksz;
ed34f34d 79 startblock += part_offset;
50ce4c07 80 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
ed34f34d
US		 81
82 if (fs->dev_desc == NULL)
83 return;
84
50ce4c07 85 if ((startblock + (size >> log2blksz)) >
ed34f34d
US		 86 (part_offset + fs->total_sect)) {
87 printf("part_offset is %lu\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 {
50ce4c07 104 if (size >> log2blksz != 0) {
ed34f34d
US		 105 fs->dev_desc->block_write(fs->dev_desc->dev,
106 startblock,
50ce4c07 107 size >> log2blksz,
ed34f34d
US		 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
121static 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
158static 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
199int 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
235void 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
265int 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
290void 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
311int 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
73c15c63 317 desc = (struct ext2_block_group *)&fs->bgd[i];
ed34f34d
US		 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
332static 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
362void 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;
ed34f34d
US		 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 }
394restart:
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(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;
ed34f34d
US		 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);
ed34f34d
US		 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);
ed34f34d
US		 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
516fail:
517 free(zero_buffer);
518 free(root_first_block_buffer);
519}
520
521static 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(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
597fail:
598 free(block_buffer);
599
600 return -1;
601}
602
603static 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
619static 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
644int 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 */
660int 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
735end:
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
756fail:
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
766static 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(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 }
834fail:
835 free(root_first_block_buffer);
836
837 return -1;
838}
839
840int 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
860long 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;
73c15c63 873 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
ed34f34d
US		 874
875 if (fs->first_pass_bbmap == 0) {
876 for (i = 0; i < fs->no_blkgrp; i++) {
73c15c63
SG		 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 *
ed34f34d
US		 880 fs->blksz)),
881 zero_buffer, fs->blksz);
73c15c63
SG		 882 bgd[i].bg_flags =
883 bgd[i].
ed34f34d
US		 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++;
73c15c63 896 bgd[i].free_blocks--;
ed34f34d 897 fs->sb->free_blocks--;
73c15c63 898 status = ext4fs_devread(bgd[i].block_id *
ed34f34d
US		 899 fs->sect_perblk, 0,
900 fs->blksz,
901 journal_buffer);
902 if (status == 0)
903 goto fail;
904 if (ext4fs_log_journal(journal_buffer,
73c15c63 905 bgd[i].block_id))
ed34f34d
US		 906 goto fail;
907 goto success;
908 } else {
909 debug("no space left on block group %d\n", i);
910 }
911 }
912
913 goto fail;
914 } else {
915restart:
916 fs->curr_blkno++;
917 /* get the blockbitmap index respective to blockno */
918 if (fs->blksz != 1024) {
919 bg_idx = fs->curr_blkno / blk_per_grp;
920 } else {
921 bg_idx = fs->curr_blkno / blk_per_grp;
922 remainder = fs->curr_blkno % blk_per_grp;
923 if (!remainder)
924 bg_idx--;
925 }
926
927 /*
928 * To skip completely filled block group bitmaps
929 * Optimize the block allocation
930 */
931 if (bg_idx >= fs->no_blkgrp)
932 goto fail;
933
73c15c63 934 if (bgd[bg_idx].free_blocks == 0) {
ed34f34d
US		 935 debug("block group %u is full. Skipping\n", bg_idx);
936 fs->curr_blkno = fs->curr_blkno + blk_per_grp;
937 fs->curr_blkno--;
938 goto restart;
939 }
940
73c15c63 941 if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
ed34f34d 942 memset(zero_buffer, '\0', fs->blksz);
73c15c63
SG		 943 put_ext4(((uint64_t) (bgd[bg_idx].block_id *
944 fs->blksz)), zero_buffer, fs->blksz);
ed34f34d 945 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
73c15c63 946 bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags &
ed34f34d
US		 947 ~EXT4_BG_BLOCK_UNINIT;
948 }
949
950 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
951 bg_idx) != 0) {
952 debug("going for restart for the block no %ld %u\n",
953 fs->curr_blkno, bg_idx);
954 goto restart;
955 }
956
957 /* journal backup */
958 if (prev_bg_bitmap_index != bg_idx) {
959 memset(journal_buffer, '\0', fs->blksz);
73c15c63 960 status = ext4fs_devread(bgd[bg_idx].block_id
ed34f34d
US		 961 * fs->sect_perblk,
962 0, fs->blksz, journal_buffer);
963 if (status == 0)
964 goto fail;
965 if (ext4fs_log_journal(journal_buffer,
73c15c63 966 bgd[bg_idx].block_id))
ed34f34d
US		 967 goto fail;
968
969 prev_bg_bitmap_index = bg_idx;
970 }
73c15c63 971 bgd[bg_idx].free_blocks--;
ed34f34d
US		 972 fs->sb->free_blocks--;
973 goto success;
974 }
975success:
976 free(journal_buffer);
977 free(zero_buffer);
978
979 return fs->curr_blkno;
980fail:
981 free(journal_buffer);
982 free(zero_buffer);
983
984 return -1;
985}
986
987int ext4fs_get_new_inode_no(void)
988{
989 short i;
990 short status;
991 unsigned int ibmap_idx;
992 static int prev_inode_bitmap_index = -1;
993 unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
994 struct ext_filesystem *fs = get_fs();
995 char *journal_buffer = zalloc(fs->blksz);
996 char *zero_buffer = zalloc(fs->blksz);
997 if (!journal_buffer || !zero_buffer)
998 goto fail;
73c15c63 999 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
ed34f34d
US		 1000
1001 if (fs->first_pass_ibmap == 0) {
1002 for (i = 0; i < fs->no_blkgrp; i++) {
73c15c63
SG		 1003 if (bgd[i].free_inodes) {
1004 if (bgd[i].bg_itable_unused !=
1005 bgd[i].free_inodes)
1006 bgd[i].bg_itable_unused =
1007 bgd[i].free_inodes;
1008 if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
ed34f34d 1009 put_ext4(((uint64_t)
73c15c63
SG		 1010 (bgd[i].inode_id *
1011 fs->blksz)),
ed34f34d 1012 zero_buffer, fs->blksz);
73c15c63 1013 bgd[i].bg_flags = bgd[i].bg_flags &
ed34f34d
US		 1014 ~EXT4_BG_INODE_UNINIT;
1015 memcpy(fs->inode_bmaps[i],
1016 zero_buffer, fs->blksz);
1017 }
1018 fs->curr_inode_no =
1019 _get_new_inode_no(fs->inode_bmaps[i]);
1020 if (fs->curr_inode_no == -1)
1021 /* if block bitmap is completely fill */
1022 continue;
1023 fs->curr_inode_no = fs->curr_inode_no +
1024 (i * inodes_per_grp);
1025 fs->first_pass_ibmap++;
73c15c63
SG		 1026 bgd[i].free_inodes--;
1027 bgd[i].bg_itable_unused--;
ed34f34d 1028 fs->sb->free_inodes--;
73c15c63 1029 status = ext4fs_devread(bgd[i].inode_id *
ed34f34d
US		 1030 fs->sect_perblk, 0,
1031 fs->blksz,
1032 journal_buffer);
1033 if (status == 0)
1034 goto fail;
1035 if (ext4fs_log_journal(journal_buffer,
73c15c63 1036 bgd[i].inode_id))
ed34f34d
US		 1037 goto fail;
1038 goto success;
1039 } else
1040 debug("no inode left on block group %d\n", i);
1041 }
1042 goto fail;
1043 } else {
1044restart:
1045 fs->curr_inode_no++;
1046 /* get the blockbitmap index respective to blockno */
1047 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
73c15c63 1048 if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
ed34f34d 1049 memset(zero_buffer, '\0', fs->blksz);
73c15c63 1050 put_ext4(((uint64_t) (bgd[ibmap_idx].inode_id *
ed34f34d
US		 1051 fs->blksz)), zero_buffer,
1052 fs->blksz);
73c15c63
SG		 1053 bgd[ibmap_idx].bg_flags =
1054 bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
ed34f34d
US		 1055 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1056 fs->blksz);
1057 }
1058
1059 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1060 fs->inode_bmaps[ibmap_idx],
1061 ibmap_idx) != 0) {
1062 debug("going for restart for the block no %d %u\n",
1063 fs->curr_inode_no, ibmap_idx);
1064 goto restart;
1065 }
1066
1067 /* journal backup */
1068 if (prev_inode_bitmap_index != ibmap_idx) {
1069 memset(journal_buffer, '\0', fs->blksz);
73c15c63 1070 status = ext4fs_devread(bgd[ibmap_idx].inode_id
ed34f34d
US		 1071 * fs->sect_perblk,
1072 0, fs->blksz, journal_buffer);
1073 if (status == 0)
1074 goto fail;
1075 if (ext4fs_log_journal(journal_buffer,
73c15c63 1076 bgd[ibmap_idx].inode_id))
ed34f34d
US		 1077 goto fail;
1078 prev_inode_bitmap_index = ibmap_idx;
1079 }
73c15c63
SG		 1080 if (bgd[ibmap_idx].bg_itable_unused !=
1081 bgd[ibmap_idx].free_inodes)
1082 bgd[ibmap_idx].bg_itable_unused =
1083 bgd[ibmap_idx].free_inodes;
1084 bgd[ibmap_idx].free_inodes--;
1085 bgd[ibmap_idx].bg_itable_unused--;
ed34f34d
US		 1086 fs->sb->free_inodes--;
1087 goto success;
1088 }
1089
1090success:
1091 free(journal_buffer);
1092 free(zero_buffer);
1093
1094 return fs->curr_inode_no;
1095fail:
1096 free(journal_buffer);
1097 free(zero_buffer);
1098
1099 return -1;
1100
1101}
1102
1103
1104static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1105 unsigned int *total_remaining_blocks,
1106 unsigned int *no_blks_reqd)
1107{
1108 short i;
1109 short status;
1110 long int actual_block_no;
1111 long int si_blockno;
1112 /* si :single indirect */
1113 unsigned int *si_buffer = NULL;
1114 unsigned int *si_start_addr = NULL;
1115 struct ext_filesystem *fs = get_fs();
1116
1117 if (*total_remaining_blocks != 0) {
1118 si_buffer = zalloc(fs->blksz);
1119 if (!si_buffer) {
1120 printf("No Memory\n");
1121 return;
1122 }
1123 si_start_addr = si_buffer;
1124 si_blockno = ext4fs_get_new_blk_no();
1125 if (si_blockno == -1) {
1126 printf("no block left to assign\n");
1127 goto fail;
1128 }
1129 (*no_blks_reqd)++;
1130 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1131
1132 status = ext4fs_devread(si_blockno * fs->sect_perblk,
1133 0, fs->blksz, (char *)si_buffer);
1134 memset(si_buffer, '\0', fs->blksz);
1135 if (status == 0)
1136 goto fail;
1137
1138 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1139 actual_block_no = ext4fs_get_new_blk_no();
1140 if (actual_block_no == -1) {
1141 printf("no block left to assign\n");
1142 goto fail;
1143 }
1144 *si_buffer = actual_block_no;
1145 debug("SIAB %u: %u\n", *si_buffer,
1146 *total_remaining_blocks);
1147
1148 si_buffer++;
1149 (*total_remaining_blocks)--;
1150 if (*total_remaining_blocks == 0)
1151 break;
1152 }
1153
1154 /* write the block to disk */
1155 put_ext4(((uint64_t) (si_blockno * fs->blksz)),
1156 si_start_addr, fs->blksz);
1157 file_inode->b.blocks.indir_block = si_blockno;
1158 }
1159fail:
1160 free(si_start_addr);
1161}
1162
1163static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1164 unsigned int *total_remaining_blocks,
1165 unsigned int *no_blks_reqd)
1166{
1167 short i;
1168 short j;
1169 short status;
1170 long int actual_block_no;
1171 /* di:double indirect */
1172 long int di_blockno_parent;
1173 long int di_blockno_child;
1174 unsigned int *di_parent_buffer = NULL;
1175 unsigned int *di_child_buff = NULL;
1176 unsigned int *di_block_start_addr = NULL;
1177 unsigned int *di_child_buff_start = NULL;
1178 struct ext_filesystem *fs = get_fs();
1179
1180 if (*total_remaining_blocks != 0) {
1181 /* double indirect parent block connecting to inode */
1182 di_blockno_parent = ext4fs_get_new_blk_no();
1183 if (di_blockno_parent == -1) {
1184 printf("no block left to assign\n");
1185 goto fail;
1186 }
1187 di_parent_buffer = zalloc(fs->blksz);
1188 if (!di_parent_buffer)
1189 goto fail;
1190
1191 di_block_start_addr = di_parent_buffer;
1192 (*no_blks_reqd)++;
1193 debug("DIPB %ld: %u\n", di_blockno_parent,
1194 *total_remaining_blocks);
1195
1196 status = ext4fs_devread(di_blockno_parent *
1197 fs->sect_perblk, 0,
1198 fs->blksz, (char *)di_parent_buffer);
d429ca0d
ŁM		 1199
1200 if (!status) {
1201 printf("%s: Device read error!\n", __func__);
1202 goto fail;
1203 }
ed34f34d
US		 1204 memset(di_parent_buffer, '\0', fs->blksz);
1205
1206 /*
1207 * start:for each double indirect parent
1208 * block create one more block
1209 */
1210 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1211 di_blockno_child = ext4fs_get_new_blk_no();
1212 if (di_blockno_child == -1) {
1213 printf("no block left to assign\n");
1214 goto fail;
1215 }
1216 di_child_buff = zalloc(fs->blksz);
1217 if (!di_child_buff)
1218 goto fail;
1219
1220 di_child_buff_start = di_child_buff;
1221 *di_parent_buffer = di_blockno_child;
1222 di_parent_buffer++;
1223 (*no_blks_reqd)++;
1224 debug("DICB %ld: %u\n", di_blockno_child,
1225 *total_remaining_blocks);
1226
1227 status = ext4fs_devread(di_blockno_child *
1228 fs->sect_perblk, 0,
1229 fs->blksz,
1230 (char *)di_child_buff);
d429ca0d
ŁM		 1231
1232 if (!status) {
1233 printf("%s: Device read error!\n", __func__);
1234 goto fail;
1235 }
ed34f34d
US		 1236 memset(di_child_buff, '\0', fs->blksz);
1237 /* filling of actual datablocks for each child */
1238 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1239 actual_block_no = ext4fs_get_new_blk_no();
1240 if (actual_block_no == -1) {
1241 printf("no block left to assign\n");
1242 goto fail;
1243 }
1244 *di_child_buff = actual_block_no;
1245 debug("DIAB %ld: %u\n", actual_block_no,
1246 *total_remaining_blocks);
1247
1248 di_child_buff++;
1249 (*total_remaining_blocks)--;
1250 if (*total_remaining_blocks == 0)
1251 break;
1252 }
1253 /* write the block table */
1254 put_ext4(((uint64_t) (di_blockno_child * fs->blksz)),
1255 di_child_buff_start, fs->blksz);
1256 free(di_child_buff_start);
1257 di_child_buff_start = NULL;
1258
1259 if (*total_remaining_blocks == 0)
1260 break;
1261 }
1262 put_ext4(((uint64_t) (di_blockno_parent * fs->blksz)),
1263 di_block_start_addr, fs->blksz);
1264 file_inode->b.blocks.double_indir_block = di_blockno_parent;
1265 }
1266fail:
1267 free(di_block_start_addr);
1268}
1269
1270static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1271 unsigned int *total_remaining_blocks,
1272 unsigned int *no_blks_reqd)
1273{
1274 short i;
1275 short j;
1276 short k;
1277 long int actual_block_no;
1278 /* ti: Triple Indirect */
1279 long int ti_gp_blockno;
1280 long int ti_parent_blockno;
1281 long int ti_child_blockno;
1282 unsigned int *ti_gp_buff = NULL;
1283 unsigned int *ti_parent_buff = NULL;
1284 unsigned int *ti_child_buff = NULL;
1285 unsigned int *ti_gp_buff_start_addr = NULL;
1286 unsigned int *ti_pbuff_start_addr = NULL;
1287 unsigned int *ti_cbuff_start_addr = NULL;
1288 struct ext_filesystem *fs = get_fs();
1289 if (*total_remaining_blocks != 0) {
1290 /* triple indirect grand parent block connecting to inode */
1291 ti_gp_blockno = ext4fs_get_new_blk_no();
1292 if (ti_gp_blockno == -1) {
1293 printf("no block left to assign\n");
1294 goto fail;
1295 }
1296 ti_gp_buff = zalloc(fs->blksz);
1297 if (!ti_gp_buff)
1298 goto fail;
1299
1300 ti_gp_buff_start_addr = ti_gp_buff;
1301 (*no_blks_reqd)++;
1302 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1303 *total_remaining_blocks);
1304
1305 /* for each 4 byte grand parent entry create one more block */
1306 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1307 ti_parent_blockno = ext4fs_get_new_blk_no();
1308 if (ti_parent_blockno == -1) {
1309 printf("no block left to assign\n");
1310 goto fail;
1311 }
1312 ti_parent_buff = zalloc(fs->blksz);
1313 if (!ti_parent_buff)
1314 goto fail;
1315
1316 ti_pbuff_start_addr = ti_parent_buff;
1317 *ti_gp_buff = ti_parent_blockno;
1318 ti_gp_buff++;
1319 (*no_blks_reqd)++;
1320 debug("TIPB %ld: %u\n", ti_parent_blockno,
1321 *total_remaining_blocks);
1322
1323 /* for each 4 byte entry parent create one more block */
1324 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1325 ti_child_blockno = ext4fs_get_new_blk_no();
1326 if (ti_child_blockno == -1) {
1327 printf("no block left assign\n");
1328 goto fail;
1329 }
1330 ti_child_buff = zalloc(fs->blksz);
1331 if (!ti_child_buff)
1332 goto fail;
1333
1334 ti_cbuff_start_addr = ti_child_buff;
1335 *ti_parent_buff = ti_child_blockno;
1336 ti_parent_buff++;
1337 (*no_blks_reqd)++;
1338 debug("TICB %ld: %u\n", ti_parent_blockno,
1339 *total_remaining_blocks);
1340
1341 /* fill actual datablocks for each child */
1342 for (k = 0; k < (fs->blksz / sizeof(int));
1343 k++) {
1344 actual_block_no =
1345 ext4fs_get_new_blk_no();
1346 if (actual_block_no == -1) {
1347 printf("no block left\n");
1348 goto fail;
1349 }
1350 *ti_child_buff = actual_block_no;
1351 debug("TIAB %ld: %u\n", actual_block_no,
1352 *total_remaining_blocks);
1353
1354 ti_child_buff++;
1355 (*total_remaining_blocks)--;
1356 if (*total_remaining_blocks == 0)
1357 break;
1358 }
1359 /* write the child block */
1360 put_ext4(((uint64_t) (ti_child_blockno *
1361 fs->blksz)),
1362 ti_cbuff_start_addr, fs->blksz);
1363 free(ti_cbuff_start_addr);
1364
1365 if (*total_remaining_blocks == 0)
1366 break;
1367 }
1368 /* write the parent block */
1369 put_ext4(((uint64_t) (ti_parent_blockno * fs->blksz)),
1370 ti_pbuff_start_addr, fs->blksz);
1371 free(ti_pbuff_start_addr);
1372
1373 if (*total_remaining_blocks == 0)
1374 break;
1375 }
1376 /* write the grand parent block */
1377 put_ext4(((uint64_t) (ti_gp_blockno * fs->blksz)),
1378 ti_gp_buff_start_addr, fs->blksz);
1379 file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
1380 }
1381fail:
1382 free(ti_gp_buff_start_addr);
1383}
1384
1385void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1386 unsigned int total_remaining_blocks,
1387 unsigned int *total_no_of_block)
1388{
1389 short i;
1390 long int direct_blockno;
1391 unsigned int no_blks_reqd = 0;
1392
1393 /* allocation of direct blocks */
1394 for (i = 0; i < INDIRECT_BLOCKS; i++) {
1395 direct_blockno = ext4fs_get_new_blk_no();
1396 if (direct_blockno == -1) {
1397 printf("no block left to assign\n");
1398 return;
1399 }
1400 file_inode->b.blocks.dir_blocks[i] = direct_blockno;
1401 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1402
1403 total_remaining_blocks--;
1404 if (total_remaining_blocks == 0)
1405 break;
1406 }
1407
1408 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1409 &no_blks_reqd);
1410 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1411 &no_blks_reqd);
1412 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1413 &no_blks_reqd);
1414 *total_no_of_block += no_blks_reqd;
1415}
1416
1417#endif
1418
a1596438
US		 1419static struct ext4_extent_header *ext4fs_get_extent_block
1420 (struct ext2_data *data, char *buf,
1421 struct ext4_extent_header *ext_block,
1422 uint32_t fileblock, int log2_blksz)
1423{
1424 struct ext4_extent_idx *index;
1425 unsigned long long block;
1426 struct ext_filesystem *fs = get_fs();
1427 int i;
1428
1429 while (1) {
1430 index = (struct ext4_extent_idx *)(ext_block + 1);
1431
1432 if (le32_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1433 return 0;
1434
1435 if (ext_block->eh_depth == 0)
1436 return ext_block;
1437 i = -1;
1438 do {
1439 i++;
1440 if (i >= le32_to_cpu(ext_block->eh_entries))
1441 break;
1442 } while (fileblock > le32_to_cpu(index[i].ei_block));
1443
1444 if (--i < 0)
1445 return 0;
1446
1447 block = le32_to_cpu(index[i].ei_leaf_hi);
1448 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1449
1450 if (ext4fs_devread(block << log2_blksz, 0, fs->blksz, buf))
1451 ext_block = (struct ext4_extent_header *)buf;
1452 else
1453 return 0;
1454 }
1455}
1456
1457static int ext4fs_blockgroup
1458 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1459{
1460 long int blkno;
1461 unsigned int blkoff, desc_per_blk;
50ce4c07 1462 int log2blksz = get_fs()->dev_desc->log2blksz;
a1596438
US		 1463
1464 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1465
1466 blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1467 group / desc_per_blk;
1468 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1469
1470 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1471 group, blkno, blkoff);
1472
50ce4c07 1473 return ext4fs_devread(blkno << (LOG2_BLOCK_SIZE(data) - log2blksz),
a1596438
US		 1474 blkoff, sizeof(struct ext2_block_group),
1475 (char *)blkgrp);
1476}
1477
1478int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1479{
1480 struct ext2_block_group blkgrp;
1481 struct ext2_sblock *sblock = &data->sblock;
1482 struct ext_filesystem *fs = get_fs();
50ce4c07 1483 int log2blksz = get_fs()->dev_desc->log2blksz;
a1596438
US		 1484 int inodes_per_block, status;
1485 long int blkno;
1486 unsigned int blkoff;
1487
1488 /* It is easier to calculate if the first inode is 0. */
1489 ino--;
1490 status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1491 (sblock->inodes_per_group), &blkgrp);
1492 if (status == 0)
1493 return 0;
1494
1495 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1496 blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1497 (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1498 blkoff = (ino % inodes_per_block) * fs->inodesz;
1499 /* Read the inode. */
50ce4c07
EE		 1500 status = ext4fs_devread(blkno << (LOG2_BLOCK_SIZE(data) - log2blksz),
1501 blkoff,
a1596438
US		 1502 sizeof(struct ext2_inode), (char *)inode);
1503 if (status == 0)
1504 return 0;
1505
1506 return 1;
1507}
1508
1509long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1510{
1511 long int blknr;
1512 int blksz;
1513 int log2_blksz;
1514 int status;
1515 long int rblock;
1516 long int perblock_parent;
1517 long int perblock_child;
1518 unsigned long long start;
1519 /* get the blocksize of the filesystem */
1520 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
50ce4c07
EE		 1521 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1522 - get_fs()->dev_desc->log2blksz;
1523
a1596438
US		 1524 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1525 char *buf = zalloc(blksz);
1526 if (!buf)
1527 return -ENOMEM;
1528 struct ext4_extent_header *ext_block;
1529 struct ext4_extent *extent;
1530 int i = -1;
50ce4c07
EE		 1531 ext_block =
1532 ext4fs_get_extent_block(ext4fs_root, buf,
1533 (struct ext4_extent_header *)
1534 inode->b.blocks.dir_blocks,
1535 fileblock, log2_blksz);
a1596438
US		 1536 if (!ext_block) {
1537 printf("invalid extent block\n");
1538 free(buf);
1539 return -EINVAL;
1540 }
1541
1542 extent = (struct ext4_extent *)(ext_block + 1);
1543
1544 do {
1545 i++;
1546 if (i >= le32_to_cpu(ext_block->eh_entries))
1547 break;
1548 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1549 if (--i >= 0) {
1550 fileblock -= le32_to_cpu(extent[i].ee_block);
1551 if (fileblock >= le32_to_cpu(extent[i].ee_len)) {
1552 free(buf);
1553 return 0;
1554 }
1555
1556 start = le32_to_cpu(extent[i].ee_start_hi);
1557 start = (start << 32) +
1558 le32_to_cpu(extent[i].ee_start_lo);
1559 free(buf);
1560 return fileblock + start;
1561 }
1562
1563 printf("Extent Error\n");
1564 free(buf);
1565 return -1;
1566 }
1567
1568 /* Direct blocks. */
1569 if (fileblock < INDIRECT_BLOCKS)
1570 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1571
1572 /* Indirect. */
1573 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1574 if (ext4fs_indir1_block == NULL) {
1575 ext4fs_indir1_block = zalloc(blksz);
1576 if (ext4fs_indir1_block == NULL) {
1577 printf("** SI ext2fs read block (indir 1)"
1578 "malloc failed. **\n");
1579 return -1;
1580 }
1581 ext4fs_indir1_size = blksz;
1582 ext4fs_indir1_blkno = -1;
1583 }
1584 if (blksz != ext4fs_indir1_size) {
1585 free(ext4fs_indir1_block);
1586 ext4fs_indir1_block = NULL;
1587 ext4fs_indir1_size = 0;
1588 ext4fs_indir1_blkno = -1;
1589 ext4fs_indir1_block = zalloc(blksz);
1590 if (ext4fs_indir1_block == NULL) {
1591 printf("** SI ext2fs read block (indir 1):"
1592 "malloc failed. **\n");
1593 return -1;
1594 }
1595 ext4fs_indir1_size = blksz;
1596 }
1597 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1598 log2_blksz) != ext4fs_indir1_blkno) {
1599 status =
1600 ext4fs_devread(__le32_to_cpu
1601 (inode->b.blocks.
1602 indir_block) << log2_blksz, 0,
1603 blksz, (char *)ext4fs_indir1_block);
1604 if (status == 0) {
1605 printf("** SI ext2fs read block (indir 1)"
1606 "failed. **\n");
1607 return 0;
1608 }
1609 ext4fs_indir1_blkno =
1610 __le32_to_cpu(inode->b.blocks.
1611 indir_block) << log2_blksz;
1612 }
1613 blknr = __le32_to_cpu(ext4fs_indir1_block
1614 [fileblock - INDIRECT_BLOCKS]);
1615 }
1616 /* Double indirect. */
1617 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1618 (blksz / 4 + 1)))) {
1619
1620 long int perblock = blksz / 4;
1621 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1622
1623 if (ext4fs_indir1_block == NULL) {
1624 ext4fs_indir1_block = zalloc(blksz);
1625 if (ext4fs_indir1_block == NULL) {
1626 printf("** DI ext2fs read block (indir 2 1)"
1627 "malloc failed. **\n");
1628 return -1;
1629 }
1630 ext4fs_indir1_size = blksz;
1631 ext4fs_indir1_blkno = -1;
1632 }
1633 if (blksz != ext4fs_indir1_size) {
1634 free(ext4fs_indir1_block);
1635 ext4fs_indir1_block = NULL;
1636 ext4fs_indir1_size = 0;
1637 ext4fs_indir1_blkno = -1;
1638 ext4fs_indir1_block = zalloc(blksz);
1639 if (ext4fs_indir1_block == NULL) {
1640 printf("** DI ext2fs read block (indir 2 1)"
1641 "malloc failed. **\n");
1642 return -1;
1643 }
1644 ext4fs_indir1_size = blksz;
1645 }
1646 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1647 log2_blksz) != ext4fs_indir1_blkno) {
1648 status =
1649 ext4fs_devread(__le32_to_cpu
1650 (inode->b.blocks.
1651 double_indir_block) << log2_blksz,
1652 0, blksz,
1653 (char *)ext4fs_indir1_block);
1654 if (status == 0) {
1655 printf("** DI ext2fs read block (indir 2 1)"
1656 "failed. **\n");
1657 return -1;
1658 }
1659 ext4fs_indir1_blkno =
1660 __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1661 log2_blksz;
1662 }
1663
1664 if (ext4fs_indir2_block == NULL) {
1665 ext4fs_indir2_block = zalloc(blksz);
1666 if (ext4fs_indir2_block == NULL) {
1667 printf("** DI ext2fs read block (indir 2 2)"
1668 "malloc failed. **\n");
1669 return -1;
1670 }
1671 ext4fs_indir2_size = blksz;
1672 ext4fs_indir2_blkno = -1;
1673 }
1674 if (blksz != ext4fs_indir2_size) {
1675 free(ext4fs_indir2_block);
1676 ext4fs_indir2_block = NULL;
1677 ext4fs_indir2_size = 0;
1678 ext4fs_indir2_blkno = -1;
1679 ext4fs_indir2_block = zalloc(blksz);
1680 if (ext4fs_indir2_block == NULL) {
1681 printf("** DI ext2fs read block (indir 2 2)"
1682 "malloc failed. **\n");
1683 return -1;
1684 }
1685 ext4fs_indir2_size = blksz;
1686 }
1687 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1688 log2_blksz) != ext4fs_indir2_blkno) {
1689 status = ext4fs_devread(__le32_to_cpu
1690 (ext4fs_indir1_block
1691 [rblock /
1692 perblock]) << log2_blksz, 0,
1693 blksz,
1694 (char *)ext4fs_indir2_block);
1695 if (status == 0) {
1696 printf("** DI ext2fs read block (indir 2 2)"
1697 "failed. **\n");
1698 return -1;
1699 }
1700 ext4fs_indir2_blkno =
1701 __le32_to_cpu(ext4fs_indir1_block[rblock
1702 /
1703 perblock]) <<
1704 log2_blksz;
1705 }
1706 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1707 }
1708 /* Tripple indirect. */
1709 else {
1710 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1711 (blksz / 4 * blksz / 4));
1712 perblock_child = blksz / 4;
1713 perblock_parent = ((blksz / 4) * (blksz / 4));
1714
1715 if (ext4fs_indir1_block == NULL) {
1716 ext4fs_indir1_block = zalloc(blksz);
1717 if (ext4fs_indir1_block == NULL) {
1718 printf("** TI ext2fs read block (indir 2 1)"
1719 "malloc failed. **\n");
1720 return -1;
1721 }
1722 ext4fs_indir1_size = blksz;
1723 ext4fs_indir1_blkno = -1;
1724 }
1725 if (blksz != ext4fs_indir1_size) {
1726 free(ext4fs_indir1_block);
1727 ext4fs_indir1_block = NULL;
1728 ext4fs_indir1_size = 0;
1729 ext4fs_indir1_blkno = -1;
1730 ext4fs_indir1_block = zalloc(blksz);
1731 if (ext4fs_indir1_block == NULL) {
1732 printf("** TI ext2fs read block (indir 2 1)"
1733 "malloc failed. **\n");
1734 return -1;
1735 }
1736 ext4fs_indir1_size = blksz;
1737 }
1738 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1739 log2_blksz) != ext4fs_indir1_blkno) {
1740 status = ext4fs_devread
1741 (__le32_to_cpu(inode->b.blocks.triple_indir_block)
1742 << log2_blksz, 0, blksz,
1743 (char *)ext4fs_indir1_block);
1744 if (status == 0) {
1745 printf("** TI ext2fs read block (indir 2 1)"
1746 "failed. **\n");
1747 return -1;
1748 }
1749 ext4fs_indir1_blkno =
1750 __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1751 log2_blksz;
1752 }
1753
1754 if (ext4fs_indir2_block == NULL) {
1755 ext4fs_indir2_block = zalloc(blksz);
1756 if (ext4fs_indir2_block == NULL) {
1757 printf("** TI ext2fs read block (indir 2 2)"
1758 "malloc failed. **\n");
1759 return -1;
1760 }
1761 ext4fs_indir2_size = blksz;
1762 ext4fs_indir2_blkno = -1;
1763 }
1764 if (blksz != ext4fs_indir2_size) {
1765 free(ext4fs_indir2_block);
1766 ext4fs_indir2_block = NULL;
1767 ext4fs_indir2_size = 0;
1768 ext4fs_indir2_blkno = -1;
1769 ext4fs_indir2_block = zalloc(blksz);
1770 if (ext4fs_indir2_block == NULL) {
1771 printf("** TI ext2fs read block (indir 2 2)"
1772 "malloc failed. **\n");
1773 return -1;
1774 }
1775 ext4fs_indir2_size = blksz;
1776 }
1777 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1778 perblock_parent]) <<
1779 log2_blksz)
1780 != ext4fs_indir2_blkno) {
1781 status = ext4fs_devread(__le32_to_cpu
1782 (ext4fs_indir1_block
1783 [rblock /
1784 perblock_parent]) <<
1785 log2_blksz, 0, blksz,
1786 (char *)ext4fs_indir2_block);
1787 if (status == 0) {
1788 printf("** TI ext2fs read block (indir 2 2)"
1789 "failed. **\n");
1790 return -1;
1791 }
1792 ext4fs_indir2_blkno =
1793 __le32_to_cpu(ext4fs_indir1_block[rblock /
1794 perblock_parent])
1795 << log2_blksz;
1796 }
1797
1798 if (ext4fs_indir3_block == NULL) {
1799 ext4fs_indir3_block = zalloc(blksz);
1800 if (ext4fs_indir3_block == NULL) {
1801 printf("** TI ext2fs read block (indir 2 2)"
1802 "malloc failed. **\n");
1803 return -1;
1804 }
1805 ext4fs_indir3_size = blksz;
1806 ext4fs_indir3_blkno = -1;
1807 }
1808 if (blksz != ext4fs_indir3_size) {
1809 free(ext4fs_indir3_block);
1810 ext4fs_indir3_block = NULL;
1811 ext4fs_indir3_size = 0;
1812 ext4fs_indir3_blkno = -1;
1813 ext4fs_indir3_block = zalloc(blksz);
1814 if (ext4fs_indir3_block == NULL) {
1815 printf("** TI ext2fs read block (indir 2 2)"
1816 "malloc failed. **\n");
1817 return -1;
1818 }
1819 ext4fs_indir3_size = blksz;
1820 }
1821 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1822 /
1823 perblock_child]) <<
1824 log2_blksz) != ext4fs_indir3_blkno) {
1825 status =
1826 ext4fs_devread(__le32_to_cpu
1827 (ext4fs_indir2_block
1828 [(rblock / perblock_child)
1829 % (blksz / 4)]) << log2_blksz, 0,
1830 blksz, (char *)ext4fs_indir3_block);
1831 if (status == 0) {
1832 printf("** TI ext2fs read block (indir 2 2)"
1833 "failed. **\n");
1834 return -1;
1835 }
1836 ext4fs_indir3_blkno =
1837 __le32_to_cpu(ext4fs_indir2_block[(rblock /
1838 perblock_child) %
1839 (blksz /
1840 4)]) <<
1841 log2_blksz;
1842 }
1843
1844 blknr = __le32_to_cpu(ext4fs_indir3_block
1845 [rblock % perblock_child]);
1846 }
50ce4c07 1847 debug("read_allocated_block %ld\n", blknr);
a1596438
US		 1848
1849 return blknr;
1850}
1851
1852void ext4fs_close(void)
1853{
1854 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1855 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1856 ext4fs_file = NULL;
1857 }
1858 if (ext4fs_root != NULL) {
1859 free(ext4fs_root);
1860 ext4fs_root = NULL;
1861 }
1862 if (ext4fs_indir1_block != NULL) {
1863 free(ext4fs_indir1_block);
1864 ext4fs_indir1_block = NULL;
1865 ext4fs_indir1_size = 0;
1866 ext4fs_indir1_blkno = -1;
1867 }
1868 if (ext4fs_indir2_block != NULL) {
1869 free(ext4fs_indir2_block);
1870 ext4fs_indir2_block = NULL;
1871 ext4fs_indir2_size = 0;
1872 ext4fs_indir2_blkno = -1;
1873 }
1874 if (ext4fs_indir3_block != NULL) {
1875 free(ext4fs_indir3_block);
1876 ext4fs_indir3_block = NULL;
1877 ext4fs_indir3_size = 0;
1878 ext4fs_indir3_blkno = -1;
1879 }
1880}
1881
1882int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1883 struct ext2fs_node **fnode, int *ftype)
1884{
1885 unsigned int fpos = 0;
1886 int status;
1887 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1888
1889#ifdef DEBUG
1890 if (name != NULL)
1891 printf("Iterate dir %s\n", name);
1892#endif /* of DEBUG */
1893 if (!diro->inode_read) {
1894 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1895 if (status == 0)
1896 return 0;
1897 }
1898 /* Search the file. */
1899 while (fpos < __le32_to_cpu(diro->inode.size)) {
1900 struct ext2_dirent dirent;
1901
1902 status = ext4fs_read_file(diro, fpos,
1903 sizeof(struct ext2_dirent),
1904 (char *) &dirent);
1905 if (status < 1)
1906 return 0;
1907
1908 if (dirent.namelen != 0) {
1909 char filename[dirent.namelen + 1];
1910 struct ext2fs_node *fdiro;
1911 int type = FILETYPE_UNKNOWN;
1912
1913 status = ext4fs_read_file(diro,
1914 fpos +
1915 sizeof(struct ext2_dirent),
1916 dirent.namelen, filename);
1917 if (status < 1)
1918 return 0;
1919
1920 fdiro = zalloc(sizeof(struct ext2fs_node));
1921 if (!fdiro)
1922 return 0;
1923
1924 fdiro->data = diro->data;
1925 fdiro->ino = __le32_to_cpu(dirent.inode);
1926
1927 filename[dirent.namelen] = '\0';
1928
1929 if (dirent.filetype != FILETYPE_UNKNOWN) {
1930 fdiro->inode_read = 0;
1931
1932 if (dirent.filetype == FILETYPE_DIRECTORY)
1933 type = FILETYPE_DIRECTORY;
1934 else if (dirent.filetype == FILETYPE_SYMLINK)
1935 type = FILETYPE_SYMLINK;
1936 else if (dirent.filetype == FILETYPE_REG)
1937 type = FILETYPE_REG;
1938 } else {
1939 status = ext4fs_read_inode(diro->data,
1940 __le32_to_cpu
1941 (dirent.inode),
1942 &fdiro->inode);
1943 if (status == 0) {
1944 free(fdiro);
1945 return 0;
1946 }
1947 fdiro->inode_read = 1;
1948
1949 if ((__le16_to_cpu(fdiro->inode.mode) &
1950 FILETYPE_INO_MASK) ==
1951 FILETYPE_INO_DIRECTORY) {
1952 type = FILETYPE_DIRECTORY;
1953 } else if ((__le16_to_cpu(fdiro->inode.mode)
1954 & FILETYPE_INO_MASK) ==
1955 FILETYPE_INO_SYMLINK) {
1956 type = FILETYPE_SYMLINK;
1957 } else if ((__le16_to_cpu(fdiro->inode.mode)
1958 & FILETYPE_INO_MASK) ==
1959 FILETYPE_INO_REG) {
1960 type = FILETYPE_REG;
1961 }
1962 }
1963#ifdef DEBUG
1964 printf("iterate >%s<\n", filename);
1965#endif /* of DEBUG */
1966 if ((name != NULL) && (fnode != NULL)
1967 && (ftype != NULL)) {
1968 if (strcmp(filename, name) == 0) {
1969 *ftype = type;
1970 *fnode = fdiro;
1971 return 1;
1972 }
1973 } else {
1974 if (fdiro->inode_read == 0) {
1975 status = ext4fs_read_inode(diro->data,
1976 __le32_to_cpu(
1977 dirent.inode),
1978 &fdiro->inode);
1979 if (status == 0) {
1980 free(fdiro);
1981 return 0;
1982 }
1983 fdiro->inode_read = 1;
1984 }
1985 switch (type) {
1986 case FILETYPE_DIRECTORY:
1987 printf("<DIR> ");
1988 break;
1989 case FILETYPE_SYMLINK:
1990 printf("<SYM> ");
1991 break;
1992 case FILETYPE_REG:
1993 printf(" ");
1994 break;
1995 default:
1996 printf("< ? > ");
1997 break;
1998 }
1999 printf("%10d %s\n",
2000 __le32_to_cpu(fdiro->inode.size),
2001 filename);
2002 }
2003 free(fdiro);
2004 }
2005 fpos += __le16_to_cpu(dirent.direntlen);
2006 }
2007 return 0;
2008}
2009
2010static char *ext4fs_read_symlink(struct ext2fs_node *node)
2011{
2012 char *symlink;
2013 struct ext2fs_node *diro = node;
2014 int status;
2015
2016 if (!diro->inode_read) {
2017 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2018 if (status == 0)
2019 return 0;
2020 }
2021 symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2022 if (!symlink)
2023 return 0;
2024
2025 if (__le32_to_cpu(diro->inode.size) <= 60) {
2026 strncpy(symlink, diro->inode.b.symlink,
2027 __le32_to_cpu(diro->inode.size));
2028 } else {
2029 status = ext4fs_read_file(diro, 0,
2030 __le32_to_cpu(diro->inode.size),
2031 symlink);
2032 if (status == 0) {
2033 free(symlink);
2034 return 0;
2035 }
2036 }
2037 symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2038 return symlink;
2039}
2040
2041static int ext4fs_find_file1(const char *currpath,
2042 struct ext2fs_node *currroot,
2043 struct ext2fs_node **currfound, int *foundtype)
2044{
2045 char fpath[strlen(currpath) + 1];
2046 char *name = fpath;
2047 char *next;
2048 int status;
2049 int type = FILETYPE_DIRECTORY;
2050 struct ext2fs_node *currnode = currroot;
2051 struct ext2fs_node *oldnode = currroot;
2052
2053 strncpy(fpath, currpath, strlen(currpath) + 1);
2054
2055 /* Remove all leading slashes. */
2056 while (*name == '/')
2057 name++;
2058
2059 if (!*name) {
2060 *currfound = currnode;
2061 return 1;
2062 }
2063
2064 for (;;) {
2065 int found;
2066
2067 /* Extract the actual part from the pathname. */
2068 next = strchr(name, '/');
2069 if (next) {
2070 /* Remove all leading slashes. */
2071 while (*next == '/')
2072 *(next++) = '\0';
2073 }
2074
2075 if (type != FILETYPE_DIRECTORY) {
2076 ext4fs_free_node(currnode, currroot);
2077 return 0;
2078 }
2079
2080 oldnode = currnode;
2081
2082 /* Iterate over the directory. */
2083 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2084 if (found == 0)
2085 return 0;
2086
2087 if (found == -1)
2088 break;
2089
2090 /* Read in the symlink and follow it. */
2091 if (type == FILETYPE_SYMLINK) {
2092 char *symlink;
2093
2094 /* Test if the symlink does not loop. */
2095 if (++symlinknest == 8) {
2096 ext4fs_free_node(currnode, currroot);
2097 ext4fs_free_node(oldnode, currroot);
2098 return 0;
2099 }
2100
2101 symlink = ext4fs_read_symlink(currnode);
2102 ext4fs_free_node(currnode, currroot);
2103
2104 if (!symlink) {
2105 ext4fs_free_node(oldnode, currroot);
2106 return 0;
2107 }
2108
2109 debug("Got symlink >%s<\n", symlink);
2110
2111 if (symlink[0] == '/') {
2112 ext4fs_free_node(oldnode, currroot);
2113 oldnode = &ext4fs_root->diropen;
2114 }
2115
2116 /* Lookup the node the symlink points to. */
2117 status = ext4fs_find_file1(symlink, oldnode,
2118 &currnode, &type);
2119
2120 free(symlink);
2121
2122 if (status == 0) {
2123 ext4fs_free_node(oldnode, currroot);
2124 return 0;
2125 }
2126 }
2127
2128 ext4fs_free_node(oldnode, currroot);
2129
2130 /* Found the node! */
2131 if (!next || *next == '\0') {
2132 *currfound = currnode;
2133 *foundtype = type;
2134 return 1;
2135 }
2136 name = next;
2137 }
2138 return -1;
2139}
2140
2141int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2142 struct ext2fs_node **foundnode, int expecttype)
2143{
2144 int status;
2145 int foundtype = FILETYPE_DIRECTORY;
2146
2147 symlinknest = 0;
2148 if (!path)
2149 return 0;
2150
2151 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2152 if (status == 0)
2153 return 0;
2154
2155 /* Check if the node that was found was of the expected type. */
2156 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2157 return 0;
2158 else if ((expecttype == FILETYPE_DIRECTORY)
2159 && (foundtype != expecttype))
2160 return 0;
2161
2162 return 1;
2163}
2164
2165int ext4fs_open(const char *filename)
2166{
2167 struct ext2fs_node *fdiro = NULL;
2168 int status;
2169 int len;
2170
2171 if (ext4fs_root == NULL)
2172 return -1;
2173
2174 ext4fs_file = NULL;
2175 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2176 FILETYPE_REG);
2177 if (status == 0)
2178 goto fail;
2179
2180 if (!fdiro->inode_read) {
2181 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2182 &fdiro->inode);
2183 if (status == 0)
2184 goto fail;
2185 }
2186 len = __le32_to_cpu(fdiro->inode.size);
2187 ext4fs_file = fdiro;
2188
2189 return len;
2190fail:
2191 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2192
2193 return -1;
2194}
2195
2196int ext4fs_mount(unsigned part_length)
2197{
2198 struct ext2_data *data;
2199 int status;
2200 struct ext_filesystem *fs = get_fs();
50ce4c07 2201 data = zalloc(SUPERBLOCK_SIZE);
a1596438
US		 2202 if (!data)
2203 return 0;
2204
2205 /* Read the superblock. */
50ce4c07 2206 status = ext4_read_superblock((char *)&data->sblock);
a1596438
US		 2207
2208 if (status == 0)
2209 goto fail;
2210
2211 /* Make sure this is an ext2 filesystem. */
2212 if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2213 goto fail;
2214
2215 if (__le32_to_cpu(data->sblock.revision_level == 0))
2216 fs->inodesz = 128;
2217 else
2218 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2219
2220 debug("EXT2 rev %d, inode_size %d\n",
2221 __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2222
2223 data->diropen.data = data;
2224 data->diropen.ino = 2;
2225 data->diropen.inode_read = 1;
2226 data->inode = &data->diropen.inode;
2227
2228 status = ext4fs_read_inode(data, 2, data->inode);
2229 if (status == 0)
2230 goto fail;
2231
2232 ext4fs_root = data;
2233
2234 return 1;
2235fail:
2236 printf("Failed to mount ext2 filesystem...\n");
2237 free(data);
2238 ext4fs_root = NULL;
2239
2240 return 0;
2241}
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