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[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 __le32 *ext4fs_indir1_block;
37 int ext4fs_indir1_size;
38 int ext4fs_indir1_blkno = -1;
39 __le32 *ext4fs_indir2_block;
40 int ext4fs_indir2_size;
41 int ext4fs_indir2_blkno = -1;
42
43 __le32 *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 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
51 {
52 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
53 }
54
55 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
56 {
57 sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) - 1);
58 }
59
60 static inline void ext4fs_bg_free_inodes_dec(struct ext2_block_group *bg)
61 {
62 bg->free_inodes = cpu_to_le16(le16_to_cpu(bg->free_inodes) - 1);
63 }
64
65 static inline void ext4fs_bg_free_blocks_dec(struct ext2_block_group *bg)
66 {
67 bg->free_blocks = cpu_to_le16(le16_to_cpu(bg->free_blocks) - 1);
68 }
69
70 static inline void ext4fs_bg_itable_unused_dec(struct ext2_block_group *bg)
71 {
72 bg->bg_itable_unused = cpu_to_le16(le16_to_cpu(bg->bg_itable_unused) - 1);
73 }
74
75 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
76 {
77 uint32_t res = size / n;
78 if (res * n != size)
79 res++;
80
81 return res;
82 }
83
84 void put_ext4(uint64_t off, void *buf, uint32_t size)
85 {
86 uint64_t startblock;
87 uint64_t remainder;
88 unsigned char *temp_ptr = NULL;
89 struct ext_filesystem *fs = get_fs();
90 int log2blksz = fs->dev_desc->log2blksz;
91 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
92
93 startblock = off >> log2blksz;
94 startblock += part_offset;
95 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
96
97 if (fs->dev_desc == NULL)
98 return;
99
100 if ((startblock + (size >> log2blksz)) >
101 (part_offset + fs->total_sect)) {
102 printf("part_offset is " LBAFU "\n", part_offset);
103 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
104 printf("error: overflow occurs\n");
105 return;
106 }
107
108 if (remainder) {
109 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
110 temp_ptr = sec_buf;
111 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
112 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
113 } else {
114 if (size >> log2blksz != 0) {
115 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
116 (unsigned long *)buf);
117 } else {
118 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
119 temp_ptr = sec_buf;
120 memcpy(temp_ptr, buf, size);
121 blk_dwrite(fs->dev_desc, startblock, 1,
122 (unsigned long *)sec_buf);
123 }
124 }
125 }
126
127 static int _get_new_inode_no(unsigned char *buffer)
128 {
129 struct ext_filesystem *fs = get_fs();
130 unsigned char input;
131 int operand, status;
132 int count = 1;
133 int j = 0;
134
135 /* get the blocksize of the filesystem */
136 unsigned char *ptr = buffer;
137 while (*ptr == 255) {
138 ptr++;
139 count += 8;
140 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
141 return -1;
142 }
143
144 for (j = 0; j < fs->blksz; j++) {
145 input = *ptr;
146 int i = 0;
147 while (i <= 7) {
148 operand = 1 << i;
149 status = input & operand;
150 if (status) {
151 i++;
152 count++;
153 } else {
154 *ptr |= operand;
155 return count;
156 }
157 }
158 ptr = ptr + 1;
159 }
160
161 return -1;
162 }
163
164 static int _get_new_blk_no(unsigned char *buffer)
165 {
166 unsigned char input;
167 int operand, status;
168 int count = 0;
169 int j = 0;
170 unsigned char *ptr = buffer;
171 struct ext_filesystem *fs = get_fs();
172
173 if (fs->blksz != 1024)
174 count = 0;
175 else
176 count = 1;
177
178 while (*ptr == 255) {
179 ptr++;
180 count += 8;
181 if (count == (fs->blksz * 8))
182 return -1;
183 }
184
185 for (j = 0; j < fs->blksz; j++) {
186 input = *ptr;
187 int i = 0;
188 while (i <= 7) {
189 operand = 1 << i;
190 status = input & operand;
191 if (status) {
192 i++;
193 count++;
194 } else {
195 *ptr |= operand;
196 return count;
197 }
198 }
199 ptr = ptr + 1;
200 }
201
202 return -1;
203 }
204
205 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
206 {
207 int i, remainder, status;
208 unsigned char *ptr = buffer;
209 unsigned char operand;
210 i = blockno / 8;
211 remainder = blockno % 8;
212 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
213
214 i = i - (index * blocksize);
215 if (blocksize != 1024) {
216 ptr = ptr + i;
217 operand = 1 << remainder;
218 status = *ptr & operand;
219 if (status)
220 return -1;
221
222 *ptr = *ptr | operand;
223 return 0;
224 } else {
225 if (remainder == 0) {
226 ptr = ptr + i - 1;
227 operand = (1 << 7);
228 } else {
229 ptr = ptr + i;
230 operand = (1 << (remainder - 1));
231 }
232 status = *ptr & operand;
233 if (status)
234 return -1;
235
236 *ptr = *ptr | operand;
237 return 0;
238 }
239 }
240
241 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
242 {
243 int i, remainder, status;
244 unsigned char *ptr = buffer;
245 unsigned char operand;
246 i = blockno / 8;
247 remainder = blockno % 8;
248 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
249
250 i = i - (index * blocksize);
251 if (blocksize != 1024) {
252 ptr = ptr + i;
253 operand = (1 << remainder);
254 status = *ptr & operand;
255 if (status)
256 *ptr = *ptr & ~(operand);
257 } else {
258 if (remainder == 0) {
259 ptr = ptr + i - 1;
260 operand = (1 << 7);
261 } else {
262 ptr = ptr + i;
263 operand = (1 << (remainder - 1));
264 }
265 status = *ptr & operand;
266 if (status)
267 *ptr = *ptr & ~(operand);
268 }
269 }
270
271 int ext4fs_set_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 * le32_to_cpu(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 return -1;
290
291 *ptr = *ptr | operand;
292
293 return 0;
294 }
295
296 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
297 {
298 int i, remainder, status;
299 unsigned char *ptr = buffer;
300 unsigned char operand;
301
302 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
303 i = inode_no / 8;
304 remainder = inode_no % 8;
305 if (remainder == 0) {
306 ptr = ptr + i - 1;
307 operand = (1 << 7);
308 } else {
309 ptr = ptr + i;
310 operand = (1 << (remainder - 1));
311 }
312 status = *ptr & operand;
313 if (status)
314 *ptr = *ptr & ~(operand);
315 }
316
317 uint16_t ext4fs_checksum_update(uint32_t i)
318 {
319 struct ext2_block_group *desc;
320 struct ext_filesystem *fs = get_fs();
321 uint16_t crc = 0;
322 __le32 le32_i = cpu_to_le32(i);
323
324 desc = (struct ext2_block_group *)&fs->bgd[i];
325 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
326 int offset = offsetof(struct ext2_block_group, bg_checksum);
327
328 crc = ext2fs_crc16(~0, fs->sb->unique_id,
329 sizeof(fs->sb->unique_id));
330 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
331 crc = ext2fs_crc16(crc, desc, offset);
332 offset += sizeof(desc->bg_checksum); /* skip checksum */
333 assert(offset == sizeof(*desc));
334 }
335
336 return crc;
337 }
338
339 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
340 {
341 int dentry_length;
342 int sizeof_void_space;
343 int new_entry_byte_reqd;
344 short padding_factor = 0;
345
346 if (dir->namelen % 4 != 0)
347 padding_factor = 4 - (dir->namelen % 4);
348
349 dentry_length = sizeof(struct ext2_dirent) +
350 dir->namelen + padding_factor;
351 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
352 if (sizeof_void_space == 0)
353 return 0;
354
355 padding_factor = 0;
356 if (strlen(filename) % 4 != 0)
357 padding_factor = 4 - (strlen(filename) % 4);
358
359 new_entry_byte_reqd = strlen(filename) +
360 sizeof(struct ext2_dirent) + padding_factor;
361 if (sizeof_void_space >= new_entry_byte_reqd) {
362 dir->direntlen = cpu_to_le16(dentry_length);
363 return sizeof_void_space;
364 }
365
366 return 0;
367 }
368
369 int ext4fs_update_parent_dentry(char *filename, int file_type)
370 {
371 unsigned int *zero_buffer = NULL;
372 char *root_first_block_buffer = NULL;
373 int blk_idx;
374 long int first_block_no_of_root = 0;
375 int totalbytes = 0;
376 unsigned int new_entry_byte_reqd;
377 int sizeof_void_space = 0;
378 int templength = 0;
379 int inodeno = -1;
380 int status;
381 struct ext_filesystem *fs = get_fs();
382 /* directory entry */
383 struct ext2_dirent *dir;
384 char *temp_dir = NULL;
385 uint32_t new_blk_no;
386 uint32_t new_size;
387 uint32_t new_blockcnt;
388 uint32_t directory_blocks;
389
390 zero_buffer = zalloc(fs->blksz);
391 if (!zero_buffer) {
392 printf("No Memory\n");
393 return -1;
394 }
395 root_first_block_buffer = zalloc(fs->blksz);
396 if (!root_first_block_buffer) {
397 free(zero_buffer);
398 printf("No Memory\n");
399 return -1;
400 }
401 new_entry_byte_reqd = ROUND(strlen(filename) +
402 sizeof(struct ext2_dirent), 4);
403 restart:
404 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
405 LOG2_BLOCK_SIZE(ext4fs_root);
406 blk_idx = directory_blocks - 1;
407
408 restart_read:
409 /* read the block no allocated to a file */
410 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx);
411 if (first_block_no_of_root <= 0)
412 goto fail;
413
414 status = ext4fs_devread((lbaint_t)first_block_no_of_root
415 * fs->sect_perblk,
416 0, fs->blksz, root_first_block_buffer);
417 if (status == 0)
418 goto fail;
419
420 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
421 goto fail;
422 dir = (struct ext2_dirent *)root_first_block_buffer;
423 totalbytes = 0;
424
425 while (le16_to_cpu(dir->direntlen) > 0) {
426 unsigned short used_len = ROUND(dir->namelen +
427 sizeof(struct ext2_dirent), 4);
428
429 /* last entry of block */
430 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
431
432 /* check if new entry fits */
433 if ((used_len + new_entry_byte_reqd) <=
434 le16_to_cpu(dir->direntlen)) {
435 dir->direntlen = cpu_to_le16(used_len);
436 break;
437 } else {
438 if (blk_idx > 0) {
439 printf("Block full, trying previous\n");
440 blk_idx--;
441 goto restart_read;
442 }
443 printf("All blocks full: Allocate new\n");
444
445 if (le32_to_cpu(g_parent_inode->flags) &
446 EXT4_EXTENTS_FL) {
447 printf("Directory uses extents\n");
448 goto fail;
449 }
450 if (directory_blocks >= INDIRECT_BLOCKS) {
451 printf("Directory exceeds limit\n");
452 goto fail;
453 }
454 new_blk_no = ext4fs_get_new_blk_no();
455 if (new_blk_no == -1) {
456 printf("no block left to assign\n");
457 goto fail;
458 }
459 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
460 g_parent_inode->b.blocks.
461 dir_blocks[directory_blocks] =
462 cpu_to_le32(new_blk_no);
463
464 new_size = le32_to_cpu(g_parent_inode->size);
465 new_size += fs->blksz;
466 g_parent_inode->size = cpu_to_le32(new_size);
467
468 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
469 new_blockcnt += fs->sect_perblk;
470 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
471
472 if (ext4fs_put_metadata
473 (root_first_block_buffer,
474 first_block_no_of_root))
475 goto fail;
476 goto restart;
477 }
478 }
479
480 templength = le16_to_cpu(dir->direntlen);
481 totalbytes = totalbytes + templength;
482 sizeof_void_space = check_void_in_dentry(dir, filename);
483 if (sizeof_void_space)
484 break;
485
486 dir = (struct ext2_dirent *)((char *)dir + templength);
487 }
488
489 /* make a pointer ready for creating next directory entry */
490 templength = le16_to_cpu(dir->direntlen);
491 totalbytes = totalbytes + templength;
492 dir = (struct ext2_dirent *)((char *)dir + templength);
493
494 /* get the next available inode number */
495 inodeno = ext4fs_get_new_inode_no();
496 if (inodeno == -1) {
497 printf("no inode left to assign\n");
498 goto fail;
499 }
500 dir->inode = cpu_to_le32(inodeno);
501 if (sizeof_void_space)
502 dir->direntlen = cpu_to_le16(sizeof_void_space);
503 else
504 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
505
506 dir->namelen = strlen(filename);
507 dir->filetype = FILETYPE_REG; /* regular file */
508 temp_dir = (char *)dir;
509 temp_dir = temp_dir + sizeof(struct ext2_dirent);
510 memcpy(temp_dir, filename, strlen(filename));
511
512 /* update or write the 1st block of root inode */
513 if (ext4fs_put_metadata(root_first_block_buffer,
514 first_block_no_of_root))
515 goto fail;
516
517 fail:
518 free(zero_buffer);
519 free(root_first_block_buffer);
520
521 return inodeno;
522 }
523
524 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
525 {
526 int status;
527 int inodeno = 0;
528 int offset;
529 int blk_idx;
530 long int blknr;
531 char *block_buffer = NULL;
532 struct ext2_dirent *dir = NULL;
533 struct ext_filesystem *fs = get_fs();
534 uint32_t directory_blocks;
535 char *direntname;
536
537 directory_blocks = le32_to_cpu(parent_inode->size) >>
538 LOG2_BLOCK_SIZE(ext4fs_root);
539
540 block_buffer = zalloc(fs->blksz);
541 if (!block_buffer)
542 goto fail;
543
544 /* get the block no allocated to a file */
545 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
546 blknr = read_allocated_block(parent_inode, blk_idx);
547 if (blknr == 0)
548 goto fail;
549
550 /* read the directory block */
551 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
552 0, fs->blksz, (char *)block_buffer);
553 if (status == 0)
554 goto fail;
555
556 offset = 0;
557 do {
558 dir = (struct ext2_dirent *)(block_buffer + offset);
559 direntname = (char*)(dir) + sizeof(struct ext2_dirent);
560
561 int direntlen = le16_to_cpu(dir->direntlen);
562 if (direntlen < sizeof(struct ext2_dirent))
563 break;
564
565 if (dir->inode && (strlen(dirname) == dir->namelen) &&
566 (strncmp(dirname, direntname, dir->namelen) == 0)) {
567 inodeno = le32_to_cpu(dir->inode);
568 break;
569 }
570
571 offset += direntlen;
572
573 } while (offset < fs->blksz);
574
575 if (inodeno > 0) {
576 free(block_buffer);
577 return inodeno;
578 }
579 }
580
581 fail:
582 free(block_buffer);
583
584 return -1;
585 }
586
587 static int find_dir_depth(char *dirname)
588 {
589 char *token = strtok(dirname, "/");
590 int count = 0;
591 while (token != NULL) {
592 token = strtok(NULL, "/");
593 count++;
594 }
595 return count + 1 + 1;
596 /*
597 * for example for string /home/temp
598 * depth=home(1)+temp(1)+1 extra for NULL;
599 * so count is 4;
600 */
601 }
602
603 static int parse_path(char **arr, char *dirname)
604 {
605 char *token = strtok(dirname, "/");
606 int i = 0;
607
608 /* add root */
609 arr[i] = zalloc(strlen("/") + 1);
610 if (!arr[i])
611 return -ENOMEM;
612 memcpy(arr[i++], "/", strlen("/"));
613
614 /* add each path entry after root */
615 while (token != NULL) {
616 arr[i] = zalloc(strlen(token) + 1);
617 if (!arr[i])
618 return -ENOMEM;
619 memcpy(arr[i++], token, strlen(token));
620 token = strtok(NULL, "/");
621 }
622 arr[i] = NULL;
623
624 return 0;
625 }
626
627 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
628 {
629 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
630 return -1;
631
632 return 0;
633 }
634
635 /*
636 * Function: ext4fs_get_parent_inode_num
637 * Return Value: inode Number of the parent directory of file/Directory to be
638 * created
639 * dirname : Input parmater, input path name of the file/directory to be created
640 * dname : Output parameter, to be filled with the name of the directory
641 * extracted from dirname
642 */
643 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
644 {
645 int i;
646 int depth = 0;
647 int matched_inode_no;
648 int result_inode_no = -1;
649 char **ptr = NULL;
650 char *depth_dirname = NULL;
651 char *parse_dirname = NULL;
652 struct ext2_inode *parent_inode = NULL;
653 struct ext2_inode *first_inode = NULL;
654 struct ext2_inode temp_inode;
655
656 if (*dirname != '/') {
657 printf("Please supply Absolute path\n");
658 return -1;
659 }
660
661 /* TODO: input validation make equivalent to linux */
662 depth_dirname = zalloc(strlen(dirname) + 1);
663 if (!depth_dirname)
664 return -ENOMEM;
665
666 memcpy(depth_dirname, dirname, strlen(dirname));
667 depth = find_dir_depth(depth_dirname);
668 parse_dirname = zalloc(strlen(dirname) + 1);
669 if (!parse_dirname)
670 goto fail;
671 memcpy(parse_dirname, dirname, strlen(dirname));
672
673 /* allocate memory for each directory level */
674 ptr = zalloc((depth) * sizeof(char *));
675 if (!ptr)
676 goto fail;
677 if (parse_path(ptr, parse_dirname))
678 goto fail;
679 parent_inode = zalloc(sizeof(struct ext2_inode));
680 if (!parent_inode)
681 goto fail;
682 first_inode = zalloc(sizeof(struct ext2_inode));
683 if (!first_inode)
684 goto fail;
685 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
686 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
687 if (flags & F_FILE)
688 result_inode_no = EXT2_ROOT_INO;
689 for (i = 1; i < depth; i++) {
690 matched_inode_no = search_dir(parent_inode, ptr[i]);
691 if (matched_inode_no == -1) {
692 if (ptr[i + 1] == NULL && i == 1) {
693 result_inode_no = EXT2_ROOT_INO;
694 goto end;
695 } else {
696 if (ptr[i + 1] == NULL)
697 break;
698 printf("Invalid path\n");
699 result_inode_no = -1;
700 goto fail;
701 }
702 } else {
703 if (ptr[i + 1] != NULL) {
704 memset(parent_inode, '\0',
705 sizeof(struct ext2_inode));
706 if (ext4fs_iget(matched_inode_no,
707 parent_inode)) {
708 result_inode_no = -1;
709 goto fail;
710 }
711 result_inode_no = matched_inode_no;
712 } else {
713 break;
714 }
715 }
716 }
717
718 end:
719 if (i == 1)
720 matched_inode_no = search_dir(first_inode, ptr[i]);
721 else
722 matched_inode_no = search_dir(parent_inode, ptr[i]);
723
724 if (matched_inode_no != -1) {
725 ext4fs_iget(matched_inode_no, &temp_inode);
726 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
727 printf("It is a Directory\n");
728 result_inode_no = -1;
729 goto fail;
730 }
731 }
732
733 if (strlen(ptr[i]) > 256) {
734 result_inode_no = -1;
735 goto fail;
736 }
737 memcpy(dname, ptr[i], strlen(ptr[i]));
738
739 fail:
740 free(depth_dirname);
741 free(parse_dirname);
742 for (i = 0; i < depth; i++) {
743 if (!ptr[i])
744 break;
745 free(ptr[i]);
746 }
747 free(ptr);
748 free(parent_inode);
749 free(first_inode);
750
751 return result_inode_no;
752 }
753
754 static int unlink_filename(char *filename, unsigned int blknr)
755 {
756 int totalbytes = 0;
757 int templength = 0;
758 int status, inodeno;
759 int found = 0;
760 char *root_first_block_buffer = NULL;
761 struct ext2_dirent *dir = NULL;
762 struct ext2_dirent *previous_dir = NULL;
763 char *ptr = NULL;
764 struct ext_filesystem *fs = get_fs();
765 int ret = -1;
766
767 /* get the first block of root */
768 root_first_block_buffer = zalloc(fs->blksz);
769 if (!root_first_block_buffer)
770 return -ENOMEM;
771 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
772 fs->blksz, root_first_block_buffer);
773 if (status == 0)
774 goto fail;
775
776 if (ext4fs_log_journal(root_first_block_buffer, blknr))
777 goto fail;
778 dir = (struct ext2_dirent *)root_first_block_buffer;
779 ptr = (char *)dir;
780 totalbytes = 0;
781 while (le16_to_cpu(dir->direntlen) >= 0) {
782 /*
783 * blocksize-totalbytes because last
784 * directory length i.e., *dir->direntlen
785 * is free availble space in the block that
786 * means it is a last entry of directory entry
787 */
788 if (dir->inode && (strlen(filename) == dir->namelen) &&
789 (strncmp(ptr + sizeof(struct ext2_dirent),
790 filename, dir->namelen) == 0)) {
791 printf("file found, deleting\n");
792 inodeno = le32_to_cpu(dir->inode);
793 if (previous_dir) {
794 uint16_t new_len;
795 new_len = le16_to_cpu(previous_dir->direntlen);
796 new_len += le16_to_cpu(dir->direntlen);
797 previous_dir->direntlen = cpu_to_le16(new_len);
798 } else {
799 dir->inode = 0;
800 }
801 found = 1;
802 break;
803 }
804
805 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen))
806 break;
807
808 /* traversing the each directory entry */
809 templength = le16_to_cpu(dir->direntlen);
810 totalbytes = totalbytes + templength;
811 previous_dir = dir;
812 dir = (struct ext2_dirent *)((char *)dir + templength);
813 ptr = (char *)dir;
814 }
815
816
817 if (found == 1) {
818 if (ext4fs_put_metadata(root_first_block_buffer, blknr))
819 goto fail;
820 ret = inodeno;
821 }
822 fail:
823 free(root_first_block_buffer);
824
825 return ret;
826 }
827
828 int ext4fs_filename_unlink(char *filename)
829 {
830 int blk_idx;
831 long int blknr = -1;
832 int inodeno = -1;
833 uint32_t directory_blocks;
834
835 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
836 LOG2_BLOCK_SIZE(ext4fs_root);
837
838 /* read the block no allocated to a file */
839 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
840 blknr = read_allocated_block(g_parent_inode, blk_idx);
841 if (blknr == 0)
842 break;
843 inodeno = unlink_filename(filename, blknr);
844 if (inodeno != -1)
845 return inodeno;
846 }
847
848 return -1;
849 }
850
851 uint32_t ext4fs_get_new_blk_no(void)
852 {
853 short i;
854 short status;
855 int remainder;
856 unsigned int bg_idx;
857 static int prev_bg_bitmap_index = -1;
858 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
859 struct ext_filesystem *fs = get_fs();
860 char *journal_buffer = zalloc(fs->blksz);
861 char *zero_buffer = zalloc(fs->blksz);
862 if (!journal_buffer || !zero_buffer)
863 goto fail;
864 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
865
866 if (fs->first_pass_bbmap == 0) {
867 for (i = 0; i < fs->no_blkgrp; i++) {
868 if (le16_to_cpu(bgd[i].free_blocks)) {
869 if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_BLOCK_UNINIT) {
870 uint16_t new_flags;
871 put_ext4((uint64_t)le32_to_cpu(bgd[i].block_id) * fs->blksz,
872 zero_buffer, fs->blksz);
873 new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_BLOCK_UNINIT;
874 bgd[i].bg_flags = cpu_to_le16(new_flags);
875 memcpy(fs->blk_bmaps[i], zero_buffer,
876 fs->blksz);
877 }
878 fs->curr_blkno =
879 _get_new_blk_no(fs->blk_bmaps[i]);
880 if (fs->curr_blkno == -1)
881 /* if block bitmap is completely fill */
882 continue;
883 fs->curr_blkno = fs->curr_blkno +
884 (i * fs->blksz * 8);
885 fs->first_pass_bbmap++;
886 ext4fs_bg_free_blocks_dec(&bgd[i]);
887 ext4fs_sb_free_blocks_dec(fs->sb);
888 status = ext4fs_devread(
889 (lbaint_t)le32_to_cpu(bgd[i].block_id) *
890 fs->sect_perblk, 0,
891 fs->blksz,
892 journal_buffer);
893 if (status == 0)
894 goto fail;
895 if (ext4fs_log_journal(journal_buffer,
896 le32_to_cpu(bgd[i].block_id)))
897 goto fail;
898 goto success;
899 } else {
900 debug("no space left on block group %d\n", i);
901 }
902 }
903
904 goto fail;
905 } else {
906 fs->curr_blkno++;
907 restart:
908 /* get the blockbitmap index respective to blockno */
909 bg_idx = fs->curr_blkno / blk_per_grp;
910 if (fs->blksz == 1024) {
911 remainder = fs->curr_blkno % blk_per_grp;
912 if (!remainder)
913 bg_idx--;
914 }
915
916 /*
917 * To skip completely filled block group bitmaps
918 * Optimize the block allocation
919 */
920 if (bg_idx >= fs->no_blkgrp)
921 goto fail;
922
923 if (bgd[bg_idx].free_blocks == 0) {
924 debug("block group %u is full. Skipping\n", bg_idx);
925 fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
926 if (fs->blksz == 1024)
927 fs->curr_blkno += 1;
928 goto restart;
929 }
930
931 if (le16_to_cpu(bgd[bg_idx].bg_flags) & EXT4_BG_BLOCK_UNINIT) {
932 uint16_t new_flags;
933 put_ext4((uint64_t)le32_to_cpu(bgd[bg_idx].block_id) * fs->blksz,
934 zero_buffer, fs->blksz);
935 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
936 new_flags = le16_to_cpu(bgd[bg_idx].bg_flags) & ~EXT4_BG_BLOCK_UNINIT;
937 bgd[bg_idx].bg_flags = cpu_to_le16(new_flags);
938 }
939
940 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
941 bg_idx) != 0) {
942 debug("going for restart for the block no %ld %u\n",
943 fs->curr_blkno, bg_idx);
944 fs->curr_blkno++;
945 goto restart;
946 }
947
948 /* journal backup */
949 if (prev_bg_bitmap_index != bg_idx) {
950 status = ext4fs_devread(
951 (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id)
952 * fs->sect_perblk,
953 0, fs->blksz, journal_buffer);
954 if (status == 0)
955 goto fail;
956 if (ext4fs_log_journal(journal_buffer,
957 le32_to_cpu(bgd[bg_idx].block_id)))
958 goto fail;
959
960 prev_bg_bitmap_index = bg_idx;
961 }
962 ext4fs_bg_free_blocks_dec(&bgd[bg_idx]);
963 ext4fs_sb_free_blocks_dec(fs->sb);
964 goto success;
965 }
966 success:
967 free(journal_buffer);
968 free(zero_buffer);
969
970 return fs->curr_blkno;
971 fail:
972 free(journal_buffer);
973 free(zero_buffer);
974
975 return -1;
976 }
977
978 int ext4fs_get_new_inode_no(void)
979 {
980 short i;
981 short status;
982 unsigned int ibmap_idx;
983 static int prev_inode_bitmap_index = -1;
984 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
985 struct ext_filesystem *fs = get_fs();
986 char *journal_buffer = zalloc(fs->blksz);
987 char *zero_buffer = zalloc(fs->blksz);
988 if (!journal_buffer || !zero_buffer)
989 goto fail;
990 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
991 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
992 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
993
994 if (fs->first_pass_ibmap == 0) {
995 for (i = 0; i < fs->no_blkgrp; i++) {
996 if (bgd[i].free_inodes) {
997 if (has_gdt_chksum)
998 bgd[i].bg_itable_unused =
999 bgd[i].free_inodes;
1000 if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_INODE_UNINIT) {
1001 int new_flags;
1002 put_ext4((uint64_t)le32_to_cpu(bgd[i].inode_id) * fs->blksz,
1003 zero_buffer, fs->blksz);
1004 new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_INODE_UNINIT;
1005 bgd[i].bg_flags = cpu_to_le16(new_flags);
1006 memcpy(fs->inode_bmaps[i],
1007 zero_buffer, fs->blksz);
1008 }
1009 fs->curr_inode_no =
1010 _get_new_inode_no(fs->inode_bmaps[i]);
1011 if (fs->curr_inode_no == -1)
1012 /* if block bitmap is completely fill */
1013 continue;
1014 fs->curr_inode_no = fs->curr_inode_no +
1015 (i * inodes_per_grp);
1016 fs->first_pass_ibmap++;
1017 ext4fs_bg_free_inodes_dec(&bgd[i]);
1018 if (has_gdt_chksum)
1019 ext4fs_bg_itable_unused_dec(&bgd[i]);
1020 ext4fs_sb_free_inodes_dec(fs->sb);
1021 status = ext4fs_devread(
1022 (lbaint_t)le32_to_cpu(bgd[i].inode_id) *
1023 fs->sect_perblk, 0,
1024 fs->blksz,
1025 journal_buffer);
1026 if (status == 0)
1027 goto fail;
1028 if (ext4fs_log_journal(journal_buffer,
1029 le32_to_cpu(bgd[i].inode_id)))
1030 goto fail;
1031 goto success;
1032 } else
1033 debug("no inode left on block group %d\n", i);
1034 }
1035 goto fail;
1036 } else {
1037 restart:
1038 fs->curr_inode_no++;
1039 /* get the blockbitmap index respective to blockno */
1040 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1041 if (le16_to_cpu(bgd[ibmap_idx].bg_flags) & EXT4_BG_INODE_UNINIT) {
1042 int new_flags;
1043 put_ext4((uint64_t)le32_to_cpu(bgd[ibmap_idx].inode_id) * fs->blksz,
1044 zero_buffer, fs->blksz);
1045 new_flags = le16_to_cpu(bgd[ibmap_idx].bg_flags) & ~EXT4_BG_INODE_UNINIT;
1046 bgd[ibmap_idx].bg_flags = cpu_to_le16(new_flags);
1047 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1048 fs->blksz);
1049 }
1050
1051 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1052 fs->inode_bmaps[ibmap_idx],
1053 ibmap_idx) != 0) {
1054 debug("going for restart for the block no %d %u\n",
1055 fs->curr_inode_no, ibmap_idx);
1056 goto restart;
1057 }
1058
1059 /* journal backup */
1060 if (prev_inode_bitmap_index != ibmap_idx) {
1061 memset(journal_buffer, '\0', fs->blksz);
1062 status = ext4fs_devread(
1063 (lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id)
1064 * fs->sect_perblk,
1065 0, fs->blksz, journal_buffer);
1066 if (status == 0)
1067 goto fail;
1068 if (ext4fs_log_journal(journal_buffer,
1069 le32_to_cpu(bgd[ibmap_idx].inode_id)))
1070 goto fail;
1071 prev_inode_bitmap_index = ibmap_idx;
1072 }
1073 ext4fs_bg_free_inodes_dec(&bgd[ibmap_idx]);
1074 if (has_gdt_chksum)
1075 bgd[ibmap_idx].bg_itable_unused =
1076 bgd[ibmap_idx].free_inodes;
1077 ext4fs_sb_free_inodes_dec(fs->sb);
1078 goto success;
1079 }
1080
1081 success:
1082 free(journal_buffer);
1083 free(zero_buffer);
1084
1085 return fs->curr_inode_no;
1086 fail:
1087 free(journal_buffer);
1088 free(zero_buffer);
1089
1090 return -1;
1091
1092 }
1093
1094
1095 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1096 unsigned int *total_remaining_blocks,
1097 unsigned int *no_blks_reqd)
1098 {
1099 short i;
1100 short status;
1101 long int actual_block_no;
1102 long int si_blockno;
1103 /* si :single indirect */
1104 __le32 *si_buffer = NULL;
1105 __le32 *si_start_addr = NULL;
1106 struct ext_filesystem *fs = get_fs();
1107
1108 if (*total_remaining_blocks != 0) {
1109 si_buffer = zalloc(fs->blksz);
1110 if (!si_buffer) {
1111 printf("No Memory\n");
1112 return;
1113 }
1114 si_start_addr = si_buffer;
1115 si_blockno = ext4fs_get_new_blk_no();
1116 if (si_blockno == -1) {
1117 printf("no block left to assign\n");
1118 goto fail;
1119 }
1120 (*no_blks_reqd)++;
1121 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1122
1123 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1124 0, fs->blksz, (char *)si_buffer);
1125 memset(si_buffer, '\0', fs->blksz);
1126 if (status == 0)
1127 goto fail;
1128
1129 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1130 actual_block_no = ext4fs_get_new_blk_no();
1131 if (actual_block_no == -1) {
1132 printf("no block left to assign\n");
1133 goto fail;
1134 }
1135 *si_buffer = cpu_to_le32(actual_block_no);
1136 debug("SIAB %u: %u\n", *si_buffer,
1137 *total_remaining_blocks);
1138
1139 si_buffer++;
1140 (*total_remaining_blocks)--;
1141 if (*total_remaining_blocks == 0)
1142 break;
1143 }
1144
1145 /* write the block to disk */
1146 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1147 si_start_addr, fs->blksz);
1148 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1149 }
1150 fail:
1151 free(si_start_addr);
1152 }
1153
1154 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1155 unsigned int *total_remaining_blocks,
1156 unsigned int *no_blks_reqd)
1157 {
1158 short i;
1159 short j;
1160 short status;
1161 long int actual_block_no;
1162 /* di:double indirect */
1163 long int di_blockno_parent;
1164 long int di_blockno_child;
1165 __le32 *di_parent_buffer = NULL;
1166 __le32 *di_child_buff = NULL;
1167 __le32 *di_block_start_addr = NULL;
1168 __le32 *di_child_buff_start = NULL;
1169 struct ext_filesystem *fs = get_fs();
1170
1171 if (*total_remaining_blocks != 0) {
1172 /* double indirect parent block connecting to inode */
1173 di_blockno_parent = ext4fs_get_new_blk_no();
1174 if (di_blockno_parent == -1) {
1175 printf("no block left to assign\n");
1176 goto fail;
1177 }
1178 di_parent_buffer = zalloc(fs->blksz);
1179 if (!di_parent_buffer)
1180 goto fail;
1181
1182 di_block_start_addr = di_parent_buffer;
1183 (*no_blks_reqd)++;
1184 debug("DIPB %ld: %u\n", di_blockno_parent,
1185 *total_remaining_blocks);
1186
1187 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1188 fs->sect_perblk, 0,
1189 fs->blksz, (char *)di_parent_buffer);
1190
1191 if (!status) {
1192 printf("%s: Device read error!\n", __func__);
1193 goto fail;
1194 }
1195 memset(di_parent_buffer, '\0', fs->blksz);
1196
1197 /*
1198 * start:for each double indirect parent
1199 * block create one more block
1200 */
1201 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1202 di_blockno_child = ext4fs_get_new_blk_no();
1203 if (di_blockno_child == -1) {
1204 printf("no block left to assign\n");
1205 goto fail;
1206 }
1207 di_child_buff = zalloc(fs->blksz);
1208 if (!di_child_buff)
1209 goto fail;
1210
1211 di_child_buff_start = di_child_buff;
1212 *di_parent_buffer = cpu_to_le32(di_blockno_child);
1213 di_parent_buffer++;
1214 (*no_blks_reqd)++;
1215 debug("DICB %ld: %u\n", di_blockno_child,
1216 *total_remaining_blocks);
1217
1218 status = ext4fs_devread((lbaint_t)di_blockno_child *
1219 fs->sect_perblk, 0,
1220 fs->blksz,
1221 (char *)di_child_buff);
1222
1223 if (!status) {
1224 printf("%s: Device read error!\n", __func__);
1225 goto fail;
1226 }
1227 memset(di_child_buff, '\0', fs->blksz);
1228 /* filling of actual datablocks for each child */
1229 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1230 actual_block_no = ext4fs_get_new_blk_no();
1231 if (actual_block_no == -1) {
1232 printf("no block left to assign\n");
1233 goto fail;
1234 }
1235 *di_child_buff = cpu_to_le32(actual_block_no);
1236 debug("DIAB %ld: %u\n", actual_block_no,
1237 *total_remaining_blocks);
1238
1239 di_child_buff++;
1240 (*total_remaining_blocks)--;
1241 if (*total_remaining_blocks == 0)
1242 break;
1243 }
1244 /* write the block table */
1245 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1246 di_child_buff_start, fs->blksz);
1247 free(di_child_buff_start);
1248 di_child_buff_start = NULL;
1249
1250 if (*total_remaining_blocks == 0)
1251 break;
1252 }
1253 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1254 di_block_start_addr, fs->blksz);
1255 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1256 }
1257 fail:
1258 free(di_block_start_addr);
1259 }
1260
1261 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1262 unsigned int *total_remaining_blocks,
1263 unsigned int *no_blks_reqd)
1264 {
1265 short i;
1266 short j;
1267 short k;
1268 long int actual_block_no;
1269 /* ti: Triple Indirect */
1270 long int ti_gp_blockno;
1271 long int ti_parent_blockno;
1272 long int ti_child_blockno;
1273 __le32 *ti_gp_buff = NULL;
1274 __le32 *ti_parent_buff = NULL;
1275 __le32 *ti_child_buff = NULL;
1276 __le32 *ti_gp_buff_start_addr = NULL;
1277 __le32 *ti_pbuff_start_addr = NULL;
1278 __le32 *ti_cbuff_start_addr = NULL;
1279 struct ext_filesystem *fs = get_fs();
1280 if (*total_remaining_blocks != 0) {
1281 /* triple indirect grand parent block connecting to inode */
1282 ti_gp_blockno = ext4fs_get_new_blk_no();
1283 if (ti_gp_blockno == -1) {
1284 printf("no block left to assign\n");
1285 return;
1286 }
1287 ti_gp_buff = zalloc(fs->blksz);
1288 if (!ti_gp_buff)
1289 return;
1290
1291 ti_gp_buff_start_addr = ti_gp_buff;
1292 (*no_blks_reqd)++;
1293 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1294 *total_remaining_blocks);
1295
1296 /* for each 4 byte grand parent entry create one more block */
1297 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1298 ti_parent_blockno = ext4fs_get_new_blk_no();
1299 if (ti_parent_blockno == -1) {
1300 printf("no block left to assign\n");
1301 goto fail;
1302 }
1303 ti_parent_buff = zalloc(fs->blksz);
1304 if (!ti_parent_buff)
1305 goto fail;
1306
1307 ti_pbuff_start_addr = ti_parent_buff;
1308 *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1309 ti_gp_buff++;
1310 (*no_blks_reqd)++;
1311 debug("TIPB %ld: %u\n", ti_parent_blockno,
1312 *total_remaining_blocks);
1313
1314 /* for each 4 byte entry parent create one more block */
1315 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1316 ti_child_blockno = ext4fs_get_new_blk_no();
1317 if (ti_child_blockno == -1) {
1318 printf("no block left assign\n");
1319 goto fail1;
1320 }
1321 ti_child_buff = zalloc(fs->blksz);
1322 if (!ti_child_buff)
1323 goto fail1;
1324
1325 ti_cbuff_start_addr = ti_child_buff;
1326 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1327 ti_parent_buff++;
1328 (*no_blks_reqd)++;
1329 debug("TICB %ld: %u\n", ti_parent_blockno,
1330 *total_remaining_blocks);
1331
1332 /* fill actual datablocks for each child */
1333 for (k = 0; k < (fs->blksz / sizeof(int));
1334 k++) {
1335 actual_block_no =
1336 ext4fs_get_new_blk_no();
1337 if (actual_block_no == -1) {
1338 printf("no block left\n");
1339 free(ti_cbuff_start_addr);
1340 goto fail1;
1341 }
1342 *ti_child_buff = cpu_to_le32(actual_block_no);
1343 debug("TIAB %ld: %u\n", actual_block_no,
1344 *total_remaining_blocks);
1345
1346 ti_child_buff++;
1347 (*total_remaining_blocks)--;
1348 if (*total_remaining_blocks == 0)
1349 break;
1350 }
1351 /* write the child block */
1352 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1353 (uint64_t)fs->blksz)),
1354 ti_cbuff_start_addr, fs->blksz);
1355 free(ti_cbuff_start_addr);
1356
1357 if (*total_remaining_blocks == 0)
1358 break;
1359 }
1360 /* write the parent block */
1361 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1362 ti_pbuff_start_addr, fs->blksz);
1363 free(ti_pbuff_start_addr);
1364
1365 if (*total_remaining_blocks == 0)
1366 break;
1367 }
1368 /* write the grand parent block */
1369 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1370 ti_gp_buff_start_addr, fs->blksz);
1371 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1372 free(ti_gp_buff_start_addr);
1373 return;
1374 }
1375 fail1:
1376 free(ti_pbuff_start_addr);
1377 fail:
1378 free(ti_gp_buff_start_addr);
1379 }
1380
1381 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1382 unsigned int total_remaining_blocks,
1383 unsigned int *total_no_of_block)
1384 {
1385 short i;
1386 long int direct_blockno;
1387 unsigned int no_blks_reqd = 0;
1388
1389 /* allocation of direct blocks */
1390 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1391 direct_blockno = ext4fs_get_new_blk_no();
1392 if (direct_blockno == -1) {
1393 printf("no block left to assign\n");
1394 return;
1395 }
1396 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1397 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1398
1399 total_remaining_blocks--;
1400 }
1401
1402 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1403 &no_blks_reqd);
1404 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1405 &no_blks_reqd);
1406 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1407 &no_blks_reqd);
1408 *total_no_of_block += no_blks_reqd;
1409 }
1410
1411 #endif
1412
1413 static struct ext4_extent_header *ext4fs_get_extent_block
1414 (struct ext2_data *data, char *buf,
1415 struct ext4_extent_header *ext_block,
1416 uint32_t fileblock, int log2_blksz)
1417 {
1418 struct ext4_extent_idx *index;
1419 unsigned long long block;
1420 int blksz = EXT2_BLOCK_SIZE(data);
1421 int i;
1422
1423 while (1) {
1424 index = (struct ext4_extent_idx *)(ext_block + 1);
1425
1426 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1427 return NULL;
1428
1429 if (ext_block->eh_depth == 0)
1430 return ext_block;
1431 i = -1;
1432 do {
1433 i++;
1434 if (i >= le16_to_cpu(ext_block->eh_entries))
1435 break;
1436 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1437
1438 if (--i < 0)
1439 return NULL;
1440
1441 block = le16_to_cpu(index[i].ei_leaf_hi);
1442 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1443
1444 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1445 buf))
1446 ext_block = (struct ext4_extent_header *)buf;
1447 else
1448 return NULL;
1449 }
1450 }
1451
1452 static int ext4fs_blockgroup
1453 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1454 {
1455 long int blkno;
1456 unsigned int blkoff, desc_per_blk;
1457 int log2blksz = get_fs()->dev_desc->log2blksz;
1458
1459 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1460
1461 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1462 group / desc_per_blk;
1463 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1464
1465 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1466 group, blkno, blkoff);
1467
1468 return ext4fs_devread((lbaint_t)blkno <<
1469 (LOG2_BLOCK_SIZE(data) - log2blksz),
1470 blkoff, sizeof(struct ext2_block_group),
1471 (char *)blkgrp);
1472 }
1473
1474 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1475 {
1476 struct ext2_block_group blkgrp;
1477 struct ext2_sblock *sblock = &data->sblock;
1478 struct ext_filesystem *fs = get_fs();
1479 int log2blksz = get_fs()->dev_desc->log2blksz;
1480 int inodes_per_block, status;
1481 long int blkno;
1482 unsigned int blkoff;
1483
1484 /* It is easier to calculate if the first inode is 0. */
1485 ino--;
1486 status = ext4fs_blockgroup(data, ino / le32_to_cpu
1487 (sblock->inodes_per_group), &blkgrp);
1488 if (status == 0)
1489 return 0;
1490
1491 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1492 blkno = le32_to_cpu(blkgrp.inode_table_id) +
1493 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1494 blkoff = (ino % inodes_per_block) * fs->inodesz;
1495 /* Read the inode. */
1496 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1497 log2blksz), blkoff,
1498 sizeof(struct ext2_inode), (char *)inode);
1499 if (status == 0)
1500 return 0;
1501
1502 return 1;
1503 }
1504
1505 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1506 {
1507 long int blknr;
1508 int blksz;
1509 int log2_blksz;
1510 int status;
1511 long int rblock;
1512 long int perblock_parent;
1513 long int perblock_child;
1514 unsigned long long start;
1515 /* get the blocksize of the filesystem */
1516 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1517 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1518 - get_fs()->dev_desc->log2blksz;
1519
1520 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1521 char *buf = zalloc(blksz);
1522 if (!buf)
1523 return -ENOMEM;
1524 struct ext4_extent_header *ext_block;
1525 struct ext4_extent *extent;
1526 int i = -1;
1527 ext_block =
1528 ext4fs_get_extent_block(ext4fs_root, buf,
1529 (struct ext4_extent_header *)
1530 inode->b.blocks.dir_blocks,
1531 fileblock, log2_blksz);
1532 if (!ext_block) {
1533 printf("invalid extent block\n");
1534 free(buf);
1535 return -EINVAL;
1536 }
1537
1538 extent = (struct ext4_extent *)(ext_block + 1);
1539
1540 do {
1541 i++;
1542 if (i >= le16_to_cpu(ext_block->eh_entries))
1543 break;
1544 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1545 if (--i >= 0) {
1546 fileblock -= le32_to_cpu(extent[i].ee_block);
1547 if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1548 free(buf);
1549 return 0;
1550 }
1551
1552 start = le16_to_cpu(extent[i].ee_start_hi);
1553 start = (start << 32) +
1554 le32_to_cpu(extent[i].ee_start_lo);
1555 free(buf);
1556 return fileblock + start;
1557 }
1558
1559 printf("Extent Error\n");
1560 free(buf);
1561 return -1;
1562 }
1563
1564 /* Direct blocks. */
1565 if (fileblock < INDIRECT_BLOCKS)
1566 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1567
1568 /* Indirect. */
1569 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1570 if (ext4fs_indir1_block == NULL) {
1571 ext4fs_indir1_block = zalloc(blksz);
1572 if (ext4fs_indir1_block == NULL) {
1573 printf("** SI ext2fs read block (indir 1)"
1574 "malloc failed. **\n");
1575 return -1;
1576 }
1577 ext4fs_indir1_size = blksz;
1578 ext4fs_indir1_blkno = -1;
1579 }
1580 if (blksz != ext4fs_indir1_size) {
1581 free(ext4fs_indir1_block);
1582 ext4fs_indir1_block = NULL;
1583 ext4fs_indir1_size = 0;
1584 ext4fs_indir1_blkno = -1;
1585 ext4fs_indir1_block = zalloc(blksz);
1586 if (ext4fs_indir1_block == NULL) {
1587 printf("** SI ext2fs read block (indir 1):"
1588 "malloc failed. **\n");
1589 return -1;
1590 }
1591 ext4fs_indir1_size = blksz;
1592 }
1593 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1594 log2_blksz) != ext4fs_indir1_blkno) {
1595 status =
1596 ext4fs_devread((lbaint_t)le32_to_cpu
1597 (inode->b.blocks.
1598 indir_block) << log2_blksz, 0,
1599 blksz, (char *)ext4fs_indir1_block);
1600 if (status == 0) {
1601 printf("** SI ext2fs read block (indir 1)"
1602 "failed. **\n");
1603 return 0;
1604 }
1605 ext4fs_indir1_blkno =
1606 le32_to_cpu(inode->b.blocks.
1607 indir_block) << log2_blksz;
1608 }
1609 blknr = le32_to_cpu(ext4fs_indir1_block
1610 [fileblock - INDIRECT_BLOCKS]);
1611 }
1612 /* Double indirect. */
1613 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1614 (blksz / 4 + 1)))) {
1615
1616 long int perblock = blksz / 4;
1617 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1618
1619 if (ext4fs_indir1_block == NULL) {
1620 ext4fs_indir1_block = zalloc(blksz);
1621 if (ext4fs_indir1_block == NULL) {
1622 printf("** DI ext2fs read block (indir 2 1)"
1623 "malloc failed. **\n");
1624 return -1;
1625 }
1626 ext4fs_indir1_size = blksz;
1627 ext4fs_indir1_blkno = -1;
1628 }
1629 if (blksz != ext4fs_indir1_size) {
1630 free(ext4fs_indir1_block);
1631 ext4fs_indir1_block = NULL;
1632 ext4fs_indir1_size = 0;
1633 ext4fs_indir1_blkno = -1;
1634 ext4fs_indir1_block = zalloc(blksz);
1635 if (ext4fs_indir1_block == NULL) {
1636 printf("** DI ext2fs read block (indir 2 1)"
1637 "malloc failed. **\n");
1638 return -1;
1639 }
1640 ext4fs_indir1_size = blksz;
1641 }
1642 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1643 log2_blksz) != ext4fs_indir1_blkno) {
1644 status =
1645 ext4fs_devread((lbaint_t)le32_to_cpu
1646 (inode->b.blocks.
1647 double_indir_block) << log2_blksz,
1648 0, blksz,
1649 (char *)ext4fs_indir1_block);
1650 if (status == 0) {
1651 printf("** DI ext2fs read block (indir 2 1)"
1652 "failed. **\n");
1653 return -1;
1654 }
1655 ext4fs_indir1_blkno =
1656 le32_to_cpu(inode->b.blocks.double_indir_block) <<
1657 log2_blksz;
1658 }
1659
1660 if (ext4fs_indir2_block == NULL) {
1661 ext4fs_indir2_block = zalloc(blksz);
1662 if (ext4fs_indir2_block == NULL) {
1663 printf("** DI ext2fs read block (indir 2 2)"
1664 "malloc failed. **\n");
1665 return -1;
1666 }
1667 ext4fs_indir2_size = blksz;
1668 ext4fs_indir2_blkno = -1;
1669 }
1670 if (blksz != ext4fs_indir2_size) {
1671 free(ext4fs_indir2_block);
1672 ext4fs_indir2_block = NULL;
1673 ext4fs_indir2_size = 0;
1674 ext4fs_indir2_blkno = -1;
1675 ext4fs_indir2_block = zalloc(blksz);
1676 if (ext4fs_indir2_block == NULL) {
1677 printf("** DI ext2fs read block (indir 2 2)"
1678 "malloc failed. **\n");
1679 return -1;
1680 }
1681 ext4fs_indir2_size = blksz;
1682 }
1683 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1684 log2_blksz) != ext4fs_indir2_blkno) {
1685 status = ext4fs_devread((lbaint_t)le32_to_cpu
1686 (ext4fs_indir1_block
1687 [rblock /
1688 perblock]) << log2_blksz, 0,
1689 blksz,
1690 (char *)ext4fs_indir2_block);
1691 if (status == 0) {
1692 printf("** DI ext2fs read block (indir 2 2)"
1693 "failed. **\n");
1694 return -1;
1695 }
1696 ext4fs_indir2_blkno =
1697 le32_to_cpu(ext4fs_indir1_block[rblock
1698 /
1699 perblock]) <<
1700 log2_blksz;
1701 }
1702 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1703 }
1704 /* Tripple indirect. */
1705 else {
1706 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1707 (blksz / 4 * blksz / 4));
1708 perblock_child = blksz / 4;
1709 perblock_parent = ((blksz / 4) * (blksz / 4));
1710
1711 if (ext4fs_indir1_block == NULL) {
1712 ext4fs_indir1_block = zalloc(blksz);
1713 if (ext4fs_indir1_block == NULL) {
1714 printf("** TI ext2fs read block (indir 2 1)"
1715 "malloc failed. **\n");
1716 return -1;
1717 }
1718 ext4fs_indir1_size = blksz;
1719 ext4fs_indir1_blkno = -1;
1720 }
1721 if (blksz != ext4fs_indir1_size) {
1722 free(ext4fs_indir1_block);
1723 ext4fs_indir1_block = NULL;
1724 ext4fs_indir1_size = 0;
1725 ext4fs_indir1_blkno = -1;
1726 ext4fs_indir1_block = zalloc(blksz);
1727 if (ext4fs_indir1_block == NULL) {
1728 printf("** TI ext2fs read block (indir 2 1)"
1729 "malloc failed. **\n");
1730 return -1;
1731 }
1732 ext4fs_indir1_size = blksz;
1733 }
1734 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1735 log2_blksz) != ext4fs_indir1_blkno) {
1736 status = ext4fs_devread
1737 ((lbaint_t)
1738 le32_to_cpu(inode->b.blocks.triple_indir_block)
1739 << log2_blksz, 0, blksz,
1740 (char *)ext4fs_indir1_block);
1741 if (status == 0) {
1742 printf("** TI ext2fs read block (indir 2 1)"
1743 "failed. **\n");
1744 return -1;
1745 }
1746 ext4fs_indir1_blkno =
1747 le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1748 log2_blksz;
1749 }
1750
1751 if (ext4fs_indir2_block == NULL) {
1752 ext4fs_indir2_block = zalloc(blksz);
1753 if (ext4fs_indir2_block == NULL) {
1754 printf("** TI ext2fs read block (indir 2 2)"
1755 "malloc failed. **\n");
1756 return -1;
1757 }
1758 ext4fs_indir2_size = blksz;
1759 ext4fs_indir2_blkno = -1;
1760 }
1761 if (blksz != ext4fs_indir2_size) {
1762 free(ext4fs_indir2_block);
1763 ext4fs_indir2_block = NULL;
1764 ext4fs_indir2_size = 0;
1765 ext4fs_indir2_blkno = -1;
1766 ext4fs_indir2_block = zalloc(blksz);
1767 if (ext4fs_indir2_block == NULL) {
1768 printf("** TI ext2fs read block (indir 2 2)"
1769 "malloc failed. **\n");
1770 return -1;
1771 }
1772 ext4fs_indir2_size = blksz;
1773 }
1774 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1775 perblock_parent]) <<
1776 log2_blksz)
1777 != ext4fs_indir2_blkno) {
1778 status = ext4fs_devread((lbaint_t)le32_to_cpu
1779 (ext4fs_indir1_block
1780 [rblock /
1781 perblock_parent]) <<
1782 log2_blksz, 0, blksz,
1783 (char *)ext4fs_indir2_block);
1784 if (status == 0) {
1785 printf("** TI ext2fs read block (indir 2 2)"
1786 "failed. **\n");
1787 return -1;
1788 }
1789 ext4fs_indir2_blkno =
1790 le32_to_cpu(ext4fs_indir1_block[rblock /
1791 perblock_parent])
1792 << log2_blksz;
1793 }
1794
1795 if (ext4fs_indir3_block == NULL) {
1796 ext4fs_indir3_block = zalloc(blksz);
1797 if (ext4fs_indir3_block == NULL) {
1798 printf("** TI ext2fs read block (indir 2 2)"
1799 "malloc failed. **\n");
1800 return -1;
1801 }
1802 ext4fs_indir3_size = blksz;
1803 ext4fs_indir3_blkno = -1;
1804 }
1805 if (blksz != ext4fs_indir3_size) {
1806 free(ext4fs_indir3_block);
1807 ext4fs_indir3_block = NULL;
1808 ext4fs_indir3_size = 0;
1809 ext4fs_indir3_blkno = -1;
1810 ext4fs_indir3_block = zalloc(blksz);
1811 if (ext4fs_indir3_block == NULL) {
1812 printf("** TI ext2fs read block (indir 2 2)"
1813 "malloc failed. **\n");
1814 return -1;
1815 }
1816 ext4fs_indir3_size = blksz;
1817 }
1818 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1819 /
1820 perblock_child]) <<
1821 log2_blksz) != ext4fs_indir3_blkno) {
1822 status =
1823 ext4fs_devread((lbaint_t)le32_to_cpu
1824 (ext4fs_indir2_block
1825 [(rblock / perblock_child)
1826 % (blksz / 4)]) << log2_blksz, 0,
1827 blksz, (char *)ext4fs_indir3_block);
1828 if (status == 0) {
1829 printf("** TI ext2fs read block (indir 2 2)"
1830 "failed. **\n");
1831 return -1;
1832 }
1833 ext4fs_indir3_blkno =
1834 le32_to_cpu(ext4fs_indir2_block[(rblock /
1835 perblock_child) %
1836 (blksz /
1837 4)]) <<
1838 log2_blksz;
1839 }
1840
1841 blknr = le32_to_cpu(ext4fs_indir3_block
1842 [rblock % perblock_child]);
1843 }
1844 debug("read_allocated_block %ld\n", blknr);
1845
1846 return blknr;
1847 }
1848
1849 /**
1850 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1851 * global pointers
1852 *
1853 * This function assures that for a file with the same name but different size
1854 * the sequential store on the ext4 filesystem will be correct.
1855 *
1856 * In this function the global data, responsible for internal representation
1857 * of the ext4 data are initialized to the reset state. Without this, during
1858 * replacement of the smaller file with the bigger truncation of new file was
1859 * performed.
1860 */
1861 void ext4fs_reinit_global(void)
1862 {
1863 if (ext4fs_indir1_block != NULL) {
1864 free(ext4fs_indir1_block);
1865 ext4fs_indir1_block = NULL;
1866 ext4fs_indir1_size = 0;
1867 ext4fs_indir1_blkno = -1;
1868 }
1869 if (ext4fs_indir2_block != NULL) {
1870 free(ext4fs_indir2_block);
1871 ext4fs_indir2_block = NULL;
1872 ext4fs_indir2_size = 0;
1873 ext4fs_indir2_blkno = -1;
1874 }
1875 if (ext4fs_indir3_block != NULL) {
1876 free(ext4fs_indir3_block);
1877 ext4fs_indir3_block = NULL;
1878 ext4fs_indir3_size = 0;
1879 ext4fs_indir3_blkno = -1;
1880 }
1881 }
1882 void ext4fs_close(void)
1883 {
1884 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1885 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1886 ext4fs_file = NULL;
1887 }
1888 if (ext4fs_root != NULL) {
1889 free(ext4fs_root);
1890 ext4fs_root = NULL;
1891 }
1892
1893 ext4fs_reinit_global();
1894 }
1895
1896 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1897 struct ext2fs_node **fnode, int *ftype)
1898 {
1899 unsigned int fpos = 0;
1900 int status;
1901 loff_t actread;
1902 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1903
1904 #ifdef DEBUG
1905 if (name != NULL)
1906 printf("Iterate dir %s\n", name);
1907 #endif /* of DEBUG */
1908 if (!diro->inode_read) {
1909 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1910 if (status == 0)
1911 return 0;
1912 }
1913 /* Search the file. */
1914 while (fpos < le32_to_cpu(diro->inode.size)) {
1915 struct ext2_dirent dirent;
1916
1917 status = ext4fs_read_file(diro, fpos,
1918 sizeof(struct ext2_dirent),
1919 (char *)&dirent, &actread);
1920 if (status < 0)
1921 return 0;
1922
1923 if (dirent.direntlen == 0) {
1924 printf("Failed to iterate over directory %s\n", name);
1925 return 0;
1926 }
1927
1928 if (dirent.namelen != 0) {
1929 char filename[dirent.namelen + 1];
1930 struct ext2fs_node *fdiro;
1931 int type = FILETYPE_UNKNOWN;
1932
1933 status = ext4fs_read_file(diro,
1934 fpos +
1935 sizeof(struct ext2_dirent),
1936 dirent.namelen, filename,
1937 &actread);
1938 if (status < 0)
1939 return 0;
1940
1941 fdiro = zalloc(sizeof(struct ext2fs_node));
1942 if (!fdiro)
1943 return 0;
1944
1945 fdiro->data = diro->data;
1946 fdiro->ino = le32_to_cpu(dirent.inode);
1947
1948 filename[dirent.namelen] = '\0';
1949
1950 if (dirent.filetype != FILETYPE_UNKNOWN) {
1951 fdiro->inode_read = 0;
1952
1953 if (dirent.filetype == FILETYPE_DIRECTORY)
1954 type = FILETYPE_DIRECTORY;
1955 else if (dirent.filetype == FILETYPE_SYMLINK)
1956 type = FILETYPE_SYMLINK;
1957 else if (dirent.filetype == FILETYPE_REG)
1958 type = FILETYPE_REG;
1959 } else {
1960 status = ext4fs_read_inode(diro->data,
1961 le32_to_cpu
1962 (dirent.inode),
1963 &fdiro->inode);
1964 if (status == 0) {
1965 free(fdiro);
1966 return 0;
1967 }
1968 fdiro->inode_read = 1;
1969
1970 if ((le16_to_cpu(fdiro->inode.mode) &
1971 FILETYPE_INO_MASK) ==
1972 FILETYPE_INO_DIRECTORY) {
1973 type = FILETYPE_DIRECTORY;
1974 } else if ((le16_to_cpu(fdiro->inode.mode)
1975 & FILETYPE_INO_MASK) ==
1976 FILETYPE_INO_SYMLINK) {
1977 type = FILETYPE_SYMLINK;
1978 } else if ((le16_to_cpu(fdiro->inode.mode)
1979 & FILETYPE_INO_MASK) ==
1980 FILETYPE_INO_REG) {
1981 type = FILETYPE_REG;
1982 }
1983 }
1984 #ifdef DEBUG
1985 printf("iterate >%s<\n", filename);
1986 #endif /* of DEBUG */
1987 if ((name != NULL) && (fnode != NULL)
1988 && (ftype != NULL)) {
1989 if (strcmp(filename, name) == 0) {
1990 *ftype = type;
1991 *fnode = fdiro;
1992 return 1;
1993 }
1994 } else {
1995 if (fdiro->inode_read == 0) {
1996 status = ext4fs_read_inode(diro->data,
1997 le32_to_cpu(
1998 dirent.inode),
1999 &fdiro->inode);
2000 if (status == 0) {
2001 free(fdiro);
2002 return 0;
2003 }
2004 fdiro->inode_read = 1;
2005 }
2006 switch (type) {
2007 case FILETYPE_DIRECTORY:
2008 printf("<DIR> ");
2009 break;
2010 case FILETYPE_SYMLINK:
2011 printf("<SYM> ");
2012 break;
2013 case FILETYPE_REG:
2014 printf(" ");
2015 break;
2016 default:
2017 printf("< ? > ");
2018 break;
2019 }
2020 printf("%10u %s\n",
2021 le32_to_cpu(fdiro->inode.size),
2022 filename);
2023 }
2024 free(fdiro);
2025 }
2026 fpos += le16_to_cpu(dirent.direntlen);
2027 }
2028 return 0;
2029 }
2030
2031 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2032 {
2033 char *symlink;
2034 struct ext2fs_node *diro = node;
2035 int status;
2036 loff_t actread;
2037
2038 if (!diro->inode_read) {
2039 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2040 if (status == 0)
2041 return NULL;
2042 }
2043 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2044 if (!symlink)
2045 return NULL;
2046
2047 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2048 strncpy(symlink, diro->inode.b.symlink,
2049 le32_to_cpu(diro->inode.size));
2050 } else {
2051 status = ext4fs_read_file(diro, 0,
2052 le32_to_cpu(diro->inode.size),
2053 symlink, &actread);
2054 if ((status < 0) || (actread == 0)) {
2055 free(symlink);
2056 return NULL;
2057 }
2058 }
2059 symlink[le32_to_cpu(diro->inode.size)] = '\0';
2060 return symlink;
2061 }
2062
2063 static int ext4fs_find_file1(const char *currpath,
2064 struct ext2fs_node *currroot,
2065 struct ext2fs_node **currfound, int *foundtype)
2066 {
2067 char fpath[strlen(currpath) + 1];
2068 char *name = fpath;
2069 char *next;
2070 int status;
2071 int type = FILETYPE_DIRECTORY;
2072 struct ext2fs_node *currnode = currroot;
2073 struct ext2fs_node *oldnode = currroot;
2074
2075 strncpy(fpath, currpath, strlen(currpath) + 1);
2076
2077 /* Remove all leading slashes. */
2078 while (*name == '/')
2079 name++;
2080
2081 if (!*name) {
2082 *currfound = currnode;
2083 return 1;
2084 }
2085
2086 for (;;) {
2087 int found;
2088
2089 /* Extract the actual part from the pathname. */
2090 next = strchr(name, '/');
2091 if (next) {
2092 /* Remove all leading slashes. */
2093 while (*next == '/')
2094 *(next++) = '\0';
2095 }
2096
2097 if (type != FILETYPE_DIRECTORY) {
2098 ext4fs_free_node(currnode, currroot);
2099 return 0;
2100 }
2101
2102 oldnode = currnode;
2103
2104 /* Iterate over the directory. */
2105 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2106 if (found == 0)
2107 return 0;
2108
2109 if (found == -1)
2110 break;
2111
2112 /* Read in the symlink and follow it. */
2113 if (type == FILETYPE_SYMLINK) {
2114 char *symlink;
2115
2116 /* Test if the symlink does not loop. */
2117 if (++symlinknest == 8) {
2118 ext4fs_free_node(currnode, currroot);
2119 ext4fs_free_node(oldnode, currroot);
2120 return 0;
2121 }
2122
2123 symlink = ext4fs_read_symlink(currnode);
2124 ext4fs_free_node(currnode, currroot);
2125
2126 if (!symlink) {
2127 ext4fs_free_node(oldnode, currroot);
2128 return 0;
2129 }
2130
2131 debug("Got symlink >%s<\n", symlink);
2132
2133 if (symlink[0] == '/') {
2134 ext4fs_free_node(oldnode, currroot);
2135 oldnode = &ext4fs_root->diropen;
2136 }
2137
2138 /* Lookup the node the symlink points to. */
2139 status = ext4fs_find_file1(symlink, oldnode,
2140 &currnode, &type);
2141
2142 free(symlink);
2143
2144 if (status == 0) {
2145 ext4fs_free_node(oldnode, currroot);
2146 return 0;
2147 }
2148 }
2149
2150 ext4fs_free_node(oldnode, currroot);
2151
2152 /* Found the node! */
2153 if (!next || *next == '\0') {
2154 *currfound = currnode;
2155 *foundtype = type;
2156 return 1;
2157 }
2158 name = next;
2159 }
2160 return -1;
2161 }
2162
2163 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2164 struct ext2fs_node **foundnode, int expecttype)
2165 {
2166 int status;
2167 int foundtype = FILETYPE_DIRECTORY;
2168
2169 symlinknest = 0;
2170 if (!path)
2171 return 0;
2172
2173 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2174 if (status == 0)
2175 return 0;
2176
2177 /* Check if the node that was found was of the expected type. */
2178 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2179 return 0;
2180 else if ((expecttype == FILETYPE_DIRECTORY)
2181 && (foundtype != expecttype))
2182 return 0;
2183
2184 return 1;
2185 }
2186
2187 int ext4fs_open(const char *filename, loff_t *len)
2188 {
2189 struct ext2fs_node *fdiro = NULL;
2190 int status;
2191
2192 if (ext4fs_root == NULL)
2193 return -1;
2194
2195 ext4fs_file = NULL;
2196 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2197 FILETYPE_REG);
2198 if (status == 0)
2199 goto fail;
2200
2201 if (!fdiro->inode_read) {
2202 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2203 &fdiro->inode);
2204 if (status == 0)
2205 goto fail;
2206 }
2207 *len = le32_to_cpu(fdiro->inode.size);
2208 ext4fs_file = fdiro;
2209
2210 return 0;
2211 fail:
2212 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2213
2214 return -1;
2215 }
2216
2217 int ext4fs_mount(unsigned part_length)
2218 {
2219 struct ext2_data *data;
2220 int status;
2221 struct ext_filesystem *fs = get_fs();
2222 data = zalloc(SUPERBLOCK_SIZE);
2223 if (!data)
2224 return 0;
2225
2226 /* Read the superblock. */
2227 status = ext4_read_superblock((char *)&data->sblock);
2228
2229 if (status == 0)
2230 goto fail;
2231
2232 /* Make sure this is an ext2 filesystem. */
2233 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2234 goto fail;
2235
2236 /*
2237 * The 64bit feature was enabled when metadata_csum was enabled
2238 * and we do not support metadata_csum (and cannot reliably find
2239 * files when it is set. Refuse to mount.
2240 */
2241 if (le32_to_cpu(data->sblock.feature_incompat) & EXT4_FEATURE_INCOMPAT_64BIT) {
2242 printf("Unsupported feature found (64bit, possibly metadata_csum), not mounting\n");
2243 goto fail;
2244 }
2245
2246 if (le32_to_cpu(data->sblock.revision_level) == 0)
2247 fs->inodesz = 128;
2248 else
2249 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2250
2251 debug("EXT2 rev %d, inode_size %d\n",
2252 le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2253
2254 data->diropen.data = data;
2255 data->diropen.ino = 2;
2256 data->diropen.inode_read = 1;
2257 data->inode = &data->diropen.inode;
2258
2259 status = ext4fs_read_inode(data, 2, data->inode);
2260 if (status == 0)
2261 goto fail;
2262
2263 ext4fs_root = data;
2264
2265 return 1;
2266 fail:
2267 printf("Failed to mount ext2 filesystem...\n");
2268 free(data);
2269 ext4fs_root = NULL;
2270
2271 return 0;
2272 }
"Das U-Boot" Source Tree