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21#include <common.h>
22#include <blk.h>
23#include <ext_common.h>
24#include <ext4fs.h>
25#include <log.h>
26#include <malloc.h>
27#include <memalign.h>
28#include <part.h>
29#include <stddef.h>
30#include <linux/stat.h>
31#include <linux/time.h>
32#include <asm/byteorder.h>
33#include "ext4_common.h"
34
35struct ext2_data *ext4fs_root;
36struct ext2fs_node *ext4fs_file;
37__le32 *ext4fs_indir1_block;
38int ext4fs_indir1_size;
39int ext4fs_indir1_blkno = -1;
40__le32 *ext4fs_indir2_block;
41int ext4fs_indir2_size;
42int ext4fs_indir2_blkno = -1;
43
44__le32 *ext4fs_indir3_block;
45int ext4fs_indir3_size;
46int ext4fs_indir3_blkno = -1;
47struct ext2_inode *g_parent_inode;
48static int symlinknest;
49
50#if defined(CONFIG_EXT4_WRITE)
51struct ext2_block_group *ext4fs_get_group_descriptor
52 (const struct ext_filesystem *fs, uint32_t bg_idx)
53{
54 return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
55}
56
57static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
58{
59 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
60}
61
62static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
63{
64 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
65 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
66 free_blocks--;
67
68 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
69 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
70}
71
72static inline void ext4fs_bg_free_inodes_dec
73 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
74{
75 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
76 if (fs->gdsize == 64)
77 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
78 free_inodes--;
79
80 bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
81 if (fs->gdsize == 64)
82 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
83}
84
85static inline void ext4fs_bg_free_blocks_dec
86 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
87{
88 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
89 if (fs->gdsize == 64)
90 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
91 free_blocks--;
92
93 bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
94 if (fs->gdsize == 64)
95 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
96}
97
98static inline void ext4fs_bg_itable_unused_dec
99 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
100{
101 uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
102 if (fs->gdsize == 64)
103 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
104 free_inodes--;
105
106 bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
107 if (fs->gdsize == 64)
108 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
109}
110
111uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
112{
113 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
114 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
115 return free_blocks;
116}
117
118void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
119{
120 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
121 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
122}
123
124uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
125 const struct ext_filesystem *fs)
126{
127 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
128 if (fs->gdsize == 64)
129 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
130 return free_blocks;
131}
132
133static inline
134uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
135 const struct ext_filesystem *fs)
136{
137 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
138 if (fs->gdsize == 64)
139 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
140 return free_inodes;
141}
142
143static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
144{
145 return le16_to_cpu(bg->bg_flags);
146}
147
148static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
149 uint16_t flags)
150{
151 bg->bg_flags = cpu_to_le16(flags);
152}
153
154
155uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
156 const struct ext_filesystem *fs)
157{
158 uint64_t block_nr = le32_to_cpu(bg->block_id);
159 if (fs->gdsize == 64)
160 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
161 return block_nr;
162}
163
164
165uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
166 const struct ext_filesystem *fs)
167{
168 uint64_t block_nr = le32_to_cpu(bg->inode_id);
169 if (fs->gdsize == 64)
170 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
171 return block_nr;
172}
173#endif
174
175
176uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
177 const struct ext_filesystem *fs)
178{
179 uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
180 if (fs->gdsize == 64)
181 block_nr +=
182 (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
183 return block_nr;
184}
185
186#if defined(CONFIG_EXT4_WRITE)
187uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
188{
189 uint32_t res = size / n;
190 if (res * n != size)
191 res++;
192
193 return res;
194}
195
196void put_ext4(uint64_t off, const void *buf, uint32_t size)
197{
198 uint64_t startblock;
199 uint64_t remainder;
200 unsigned char *temp_ptr = NULL;
201 struct ext_filesystem *fs = get_fs();
202 int log2blksz = fs->dev_desc->log2blksz;
203 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
204
205 startblock = off >> log2blksz;
206 startblock += part_offset;
207 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
208
209 if (fs->dev_desc == NULL)
210 return;
211
212 if ((startblock + (size >> log2blksz)) >
213 (part_offset + fs->total_sect)) {
214 printf("part_offset is " LBAFU "\n", part_offset);
215 printf("total_sector is %llu\n", fs->total_sect);
216 printf("error: overflow occurs\n");
217 return;
218 }
219
220 if (remainder) {
221 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
222 temp_ptr = sec_buf;
223 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
224 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
225 } else {
226 if (size >> log2blksz != 0) {
227 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
228 (unsigned long *)buf);
229 } else {
230 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
231 temp_ptr = sec_buf;
232 memcpy(temp_ptr, buf, size);
233 blk_dwrite(fs->dev_desc, startblock, 1,
234 (unsigned long *)sec_buf);
235 }
236 }
237}
238
239static int _get_new_inode_no(unsigned char *buffer)
240{
241 struct ext_filesystem *fs = get_fs();
242 unsigned char input;
243 int operand, status;
244 int count = 1;
245 int j = 0;
246
247
248 unsigned char *ptr = buffer;
249 while (*ptr == 255) {
250 ptr++;
251 count += 8;
252 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
253 return -1;
254 }
255
256 for (j = 0; j < fs->blksz; j++) {
257 input = *ptr;
258 int i = 0;
259 while (i <= 7) {
260 operand = 1 << i;
261 status = input & operand;
262 if (status) {
263 i++;
264 count++;
265 } else {
266 *ptr |= operand;
267 return count;
268 }
269 }
270 ptr = ptr + 1;
271 }
272
273 return -1;
274}
275
276static int _get_new_blk_no(unsigned char *buffer)
277{
278 int operand;
279 int count = 0;
280 int i;
281 unsigned char *ptr = buffer;
282 struct ext_filesystem *fs = get_fs();
283
284 while (*ptr == 255) {
285 ptr++;
286 count += 8;
287 if (count == (fs->blksz * 8))
288 return -1;
289 }
290
291 if (fs->blksz == 1024)
292 count += 1;
293
294 for (i = 0; i <= 7; i++) {
295 operand = 1 << i;
296 if (*ptr & operand) {
297 count++;
298 } else {
299 *ptr |= operand;
300 return count;
301 }
302 }
303
304 return -1;
305}
306
307int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
308{
309 int i, remainder, status;
310 unsigned char *ptr = buffer;
311 unsigned char operand;
312 i = blockno / 8;
313 remainder = blockno % 8;
314 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
315
316 i = i - (index * blocksize);
317 if (blocksize != 1024) {
318 ptr = ptr + i;
319 operand = 1 << remainder;
320 status = *ptr & operand;
321 if (status)
322 return -1;
323
324 *ptr = *ptr | operand;
325 return 0;
326 } else {
327 if (remainder == 0) {
328 ptr = ptr + i - 1;
329 operand = (1 << 7);
330 } else {
331 ptr = ptr + i;
332 operand = (1 << (remainder - 1));
333 }
334 status = *ptr & operand;
335 if (status)
336 return -1;
337
338 *ptr = *ptr | operand;
339 return 0;
340 }
341}
342
343void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
344{
345 int i, remainder, status;
346 unsigned char *ptr = buffer;
347 unsigned char operand;
348 i = blockno / 8;
349 remainder = blockno % 8;
350 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
351
352 i = i - (index * blocksize);
353 if (blocksize != 1024) {
354 ptr = ptr + i;
355 operand = (1 << remainder);
356 status = *ptr & operand;
357 if (status)
358 *ptr = *ptr & ~(operand);
359 } else {
360 if (remainder == 0) {
361 ptr = ptr + i - 1;
362 operand = (1 << 7);
363 } else {
364 ptr = ptr + i;
365 operand = (1 << (remainder - 1));
366 }
367 status = *ptr & operand;
368 if (status)
369 *ptr = *ptr & ~(operand);
370 }
371}
372
373int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
374{
375 int i, remainder, status;
376 unsigned char *ptr = buffer;
377 unsigned char operand;
378
379 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
380 i = inode_no / 8;
381 remainder = inode_no % 8;
382 if (remainder == 0) {
383 ptr = ptr + i - 1;
384 operand = (1 << 7);
385 } else {
386 ptr = ptr + i;
387 operand = (1 << (remainder - 1));
388 }
389 status = *ptr & operand;
390 if (status)
391 return -1;
392
393 *ptr = *ptr | operand;
394
395 return 0;
396}
397
398void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
399{
400 int i, remainder, status;
401 unsigned char *ptr = buffer;
402 unsigned char operand;
403
404 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
405 i = inode_no / 8;
406 remainder = inode_no % 8;
407 if (remainder == 0) {
408 ptr = ptr + i - 1;
409 operand = (1 << 7);
410 } else {
411 ptr = ptr + i;
412 operand = (1 << (remainder - 1));
413 }
414 status = *ptr & operand;
415 if (status)
416 *ptr = *ptr & ~(operand);
417}
418
419uint16_t ext4fs_checksum_update(uint32_t i)
420{
421 struct ext2_block_group *desc;
422 struct ext_filesystem *fs = get_fs();
423 uint16_t crc = 0;
424 __le32 le32_i = cpu_to_le32(i);
425
426 desc = ext4fs_get_group_descriptor(fs, i);
427 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
428 int offset = offsetof(struct ext2_block_group, bg_checksum);
429
430 crc = ext2fs_crc16(~0, fs->sb->unique_id,
431 sizeof(fs->sb->unique_id));
432 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
433 crc = ext2fs_crc16(crc, desc, offset);
434 offset += sizeof(desc->bg_checksum);
435 assert(offset == sizeof(*desc));
436 if (offset < fs->gdsize) {
437 crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
438 fs->gdsize - offset);
439 }
440 }
441
442 return crc;
443}
444
445static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
446{
447 int dentry_length;
448 int sizeof_void_space;
449 int new_entry_byte_reqd;
450 short padding_factor = 0;
451
452 if (dir->namelen % 4 != 0)
453 padding_factor = 4 - (dir->namelen % 4);
454
455 dentry_length = sizeof(struct ext2_dirent) +
456 dir->namelen + padding_factor;
457 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
458 if (sizeof_void_space == 0)
459 return 0;
460
461 padding_factor = 0;
462 if (strlen(filename) % 4 != 0)
463 padding_factor = 4 - (strlen(filename) % 4);
464
465 new_entry_byte_reqd = strlen(filename) +
466 sizeof(struct ext2_dirent) + padding_factor;
467 if (sizeof_void_space >= new_entry_byte_reqd) {
468 dir->direntlen = cpu_to_le16(dentry_length);
469 return sizeof_void_space;
470 }
471
472 return 0;
473}
474
475int ext4fs_update_parent_dentry(char *filename, int file_type)
476{
477 unsigned int *zero_buffer = NULL;
478 char *root_first_block_buffer = NULL;
479 int blk_idx;
480 long int first_block_no_of_root = 0;
481 int totalbytes = 0;
482 unsigned int new_entry_byte_reqd;
483 int sizeof_void_space = 0;
484 int templength = 0;
485 int inodeno = -1;
486 int status;
487 struct ext_filesystem *fs = get_fs();
488
489 struct ext2_dirent *dir;
490 char *temp_dir = NULL;
491 uint32_t new_blk_no;
492 uint32_t new_size;
493 uint32_t new_blockcnt;
494 uint32_t directory_blocks;
495
496 zero_buffer = zalloc(fs->blksz);
497 if (!zero_buffer) {
498 printf("No Memory\n");
499 return -1;
500 }
501 root_first_block_buffer = zalloc(fs->blksz);
502 if (!root_first_block_buffer) {
503 free(zero_buffer);
504 printf("No Memory\n");
505 return -1;
506 }
507 new_entry_byte_reqd = ROUND(strlen(filename) +
508 sizeof(struct ext2_dirent), 4);
509restart:
510 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
511 LOG2_BLOCK_SIZE(ext4fs_root);
512 blk_idx = directory_blocks - 1;
513
514restart_read:
515
516 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx,
517 NULL);
518 if (first_block_no_of_root <= 0)
519 goto fail;
520
521 status = ext4fs_devread((lbaint_t)first_block_no_of_root
522 * fs->sect_perblk,
523 0, fs->blksz, root_first_block_buffer);
524 if (status == 0)
525 goto fail;
526
527 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
528 goto fail;
529 dir = (struct ext2_dirent *)root_first_block_buffer;
530 totalbytes = 0;
531
532 while (le16_to_cpu(dir->direntlen) > 0) {
533 unsigned short used_len = ROUND(dir->namelen +
534 sizeof(struct ext2_dirent), 4);
535
536
537 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
538
539
540 if ((used_len + new_entry_byte_reqd) <=
541 le16_to_cpu(dir->direntlen)) {
542 dir->direntlen = cpu_to_le16(used_len);
543 break;
544 } else {
545 if (blk_idx > 0) {
546 printf("Block full, trying previous\n");
547 blk_idx--;
548 goto restart_read;
549 }
550 printf("All blocks full: Allocate new\n");
551
552 if (le32_to_cpu(g_parent_inode->flags) &
553 EXT4_EXTENTS_FL) {
554 printf("Directory uses extents\n");
555 goto fail;
556 }
557 if (directory_blocks >= INDIRECT_BLOCKS) {
558 printf("Directory exceeds limit\n");
559 goto fail;
560 }
561 new_blk_no = ext4fs_get_new_blk_no();
562 if (new_blk_no == -1) {
563 printf("no block left to assign\n");
564 goto fail;
565 }
566 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
567 g_parent_inode->b.blocks.
568 dir_blocks[directory_blocks] =
569 cpu_to_le32(new_blk_no);
570
571 new_size = le32_to_cpu(g_parent_inode->size);
572 new_size += fs->blksz;
573 g_parent_inode->size = cpu_to_le32(new_size);
574
575 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
576 new_blockcnt += fs->blksz >> LOG2_SECTOR_SIZE;
577 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
578
579 if (ext4fs_put_metadata
580 (root_first_block_buffer,
581 first_block_no_of_root))
582 goto fail;
583 goto restart;
584 }
585 }
586
587 templength = le16_to_cpu(dir->direntlen);
588 totalbytes = totalbytes + templength;
589 sizeof_void_space = check_void_in_dentry(dir, filename);
590 if (sizeof_void_space)
591 break;
592
593 dir = (struct ext2_dirent *)((char *)dir + templength);
594 }
595
596
597 templength = le16_to_cpu(dir->direntlen);
598 totalbytes = totalbytes + templength;
599 dir = (struct ext2_dirent *)((char *)dir + templength);
600
601
602 inodeno = ext4fs_get_new_inode_no();
603 if (inodeno == -1) {
604 printf("no inode left to assign\n");
605 goto fail;
606 }
607 dir->inode = cpu_to_le32(inodeno);
608 if (sizeof_void_space)
609 dir->direntlen = cpu_to_le16(sizeof_void_space);
610 else
611 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
612
613 dir->namelen = strlen(filename);
614 dir->filetype = file_type;
615 temp_dir = (char *)dir;
616 temp_dir = temp_dir + sizeof(struct ext2_dirent);
617 memcpy(temp_dir, filename, strlen(filename));
618
619
620 if (ext4fs_put_metadata(root_first_block_buffer,
621 first_block_no_of_root))
622 goto fail;
623
624fail:
625 free(zero_buffer);
626 free(root_first_block_buffer);
627
628 return inodeno;
629}
630
631static int search_dir(struct ext2_inode *parent_inode, char *dirname)
632{
633 int status;
634 int inodeno = 0;
635 int offset;
636 int blk_idx;
637 long int blknr;
638 char *block_buffer = NULL;
639 struct ext2_dirent *dir = NULL;
640 struct ext_filesystem *fs = get_fs();
641 uint32_t directory_blocks;
642 char *direntname;
643
644 directory_blocks = le32_to_cpu(parent_inode->size) >>
645 LOG2_BLOCK_SIZE(ext4fs_root);
646
647 block_buffer = zalloc(fs->blksz);
648 if (!block_buffer)
649 goto fail;
650
651
652 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
653 blknr = read_allocated_block(parent_inode, blk_idx, NULL);
654 if (blknr <= 0)
655 goto fail;
656
657
658 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
659 0, fs->blksz, (char *)block_buffer);
660 if (status == 0)
661 goto fail;
662
663 offset = 0;
664 do {
665 if (offset & 3) {
666 printf("Badly aligned ext2_dirent\n");
667 break;
668 }
669
670 dir = (struct ext2_dirent *)(block_buffer + offset);
671 direntname = (char*)(dir) + sizeof(struct ext2_dirent);
672
673 int direntlen = le16_to_cpu(dir->direntlen);
674 if (direntlen < sizeof(struct ext2_dirent))
675 break;
676
677 if (dir->inode && (strlen(dirname) == dir->namelen) &&
678 (strncmp(dirname, direntname, dir->namelen) == 0)) {
679 inodeno = le32_to_cpu(dir->inode);
680 break;
681 }
682
683 offset += direntlen;
684
685 } while (offset < fs->blksz);
686
687 if (inodeno > 0) {
688 free(block_buffer);
689 return inodeno;
690 }
691 }
692
693fail:
694 free(block_buffer);
695
696 return -1;
697}
698
699static int find_dir_depth(char *dirname)
700{
701 char *token = strtok(dirname, "/");
702 int count = 0;
703 while (token != NULL) {
704 token = strtok(NULL, "/");
705 count++;
706 }
707 return count + 1 + 1;
708
709
710
711
712
713}
714
715static int parse_path(char **arr, char *dirname)
716{
717 char *token = strtok(dirname, "/");
718 int i = 0;
719
720
721 arr[i] = zalloc(strlen("/") + 1);
722 if (!arr[i])
723 return -ENOMEM;
724 memcpy(arr[i++], "/", strlen("/"));
725
726
727 while (token != NULL) {
728 arr[i] = zalloc(strlen(token) + 1);
729 if (!arr[i])
730 return -ENOMEM;
731 memcpy(arr[i++], token, strlen(token));
732 token = strtok(NULL, "/");
733 }
734 arr[i] = NULL;
735
736 return 0;
737}
738
739int ext4fs_iget(int inode_no, struct ext2_inode *inode)
740{
741 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
742 return -1;
743
744 return 0;
745}
746
747
748
749
750
751
752
753
754
755int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
756{
757 int i;
758 int depth = 0;
759 int matched_inode_no;
760 int result_inode_no = -1;
761 char **ptr = NULL;
762 char *depth_dirname = NULL;
763 char *parse_dirname = NULL;
764 struct ext2_inode *parent_inode = NULL;
765 struct ext2_inode *first_inode = NULL;
766 struct ext2_inode temp_inode;
767
768 if (*dirname != '/') {
769 printf("Please supply Absolute path\n");
770 return -1;
771 }
772
773
774 depth_dirname = zalloc(strlen(dirname) + 1);
775 if (!depth_dirname)
776 return -ENOMEM;
777
778 memcpy(depth_dirname, dirname, strlen(dirname));
779 depth = find_dir_depth(depth_dirname);
780 parse_dirname = zalloc(strlen(dirname) + 1);
781 if (!parse_dirname)
782 goto fail;
783 memcpy(parse_dirname, dirname, strlen(dirname));
784
785
786 ptr = zalloc((depth) * sizeof(char *));
787 if (!ptr)
788 goto fail;
789 if (parse_path(ptr, parse_dirname))
790 goto fail;
791 parent_inode = zalloc(sizeof(struct ext2_inode));
792 if (!parent_inode)
793 goto fail;
794 first_inode = zalloc(sizeof(struct ext2_inode));
795 if (!first_inode)
796 goto fail;
797 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
798 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
799 if (flags & F_FILE)
800 result_inode_no = EXT2_ROOT_INO;
801 for (i = 1; i < depth; i++) {
802 matched_inode_no = search_dir(parent_inode, ptr[i]);
803 if (matched_inode_no == -1) {
804 if (ptr[i + 1] == NULL && i == 1) {
805 result_inode_no = EXT2_ROOT_INO;
806 goto end;
807 } else {
808 if (ptr[i + 1] == NULL)
809 break;
810 printf("Invalid path\n");
811 result_inode_no = -1;
812 goto fail;
813 }
814 } else {
815 if (ptr[i + 1] != NULL) {
816 memset(parent_inode, '\0',
817 sizeof(struct ext2_inode));
818 if (ext4fs_iget(matched_inode_no,
819 parent_inode)) {
820 result_inode_no = -1;
821 goto fail;
822 }
823 result_inode_no = matched_inode_no;
824 } else {
825 break;
826 }
827 }
828 }
829
830end:
831 if (i == 1)
832 matched_inode_no = search_dir(first_inode, ptr[i]);
833 else
834 matched_inode_no = search_dir(parent_inode, ptr[i]);
835
836 if (matched_inode_no != -1) {
837 ext4fs_iget(matched_inode_no, &temp_inode);
838 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
839 printf("It is a Directory\n");
840 result_inode_no = -1;
841 goto fail;
842 }
843 }
844
845 if (strlen(ptr[i]) > 256) {
846 result_inode_no = -1;
847 goto fail;
848 }
849 memcpy(dname, ptr[i], strlen(ptr[i]));
850
851fail:
852 free(depth_dirname);
853 free(parse_dirname);
854 for (i = 0; i < depth; i++) {
855 if (!ptr[i])
856 break;
857 free(ptr[i]);
858 }
859 free(ptr);
860 free(parent_inode);
861 free(first_inode);
862
863 return result_inode_no;
864}
865
866static int unlink_filename(char *filename, unsigned int blknr)
867{
868 int status;
869 int inodeno = 0;
870 int offset;
871 char *block_buffer = NULL;
872 struct ext2_dirent *dir = NULL;
873 struct ext2_dirent *previous_dir;
874 struct ext_filesystem *fs = get_fs();
875 int ret = -1;
876 char *direntname;
877
878 block_buffer = zalloc(fs->blksz);
879 if (!block_buffer)
880 return -ENOMEM;
881
882
883 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
884 fs->blksz, block_buffer);
885 if (status == 0)
886 goto fail;
887
888 offset = 0;
889 do {
890 if (offset & 3) {
891 printf("Badly aligned ext2_dirent\n");
892 break;
893 }
894
895 previous_dir = dir;
896 dir = (struct ext2_dirent *)(block_buffer + offset);
897 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
898
899 int direntlen = le16_to_cpu(dir->direntlen);
900 if (direntlen < sizeof(struct ext2_dirent))
901 break;
902
903 if (dir->inode && (strlen(filename) == dir->namelen) &&
904 (strncmp(direntname, filename, dir->namelen) == 0)) {
905 inodeno = le32_to_cpu(dir->inode);
906 break;
907 }
908
909 offset += direntlen;
910
911 } while (offset < fs->blksz);
912
913 if (inodeno > 0) {
914 printf("file found, deleting\n");
915 if (ext4fs_log_journal(block_buffer, blknr))
916 goto fail;
917
918 if (previous_dir) {
919
920 uint16_t new_len;
921 new_len = le16_to_cpu(previous_dir->direntlen);
922 new_len += le16_to_cpu(dir->direntlen);
923 previous_dir->direntlen = cpu_to_le16(new_len);
924 } else {
925
926 dir->inode = 0;
927 }
928 if (ext4fs_put_metadata(block_buffer, blknr))
929 goto fail;
930 ret = inodeno;
931 }
932fail:
933 free(block_buffer);
934
935 return ret;
936}
937
938int ext4fs_filename_unlink(char *filename)
939{
940 int blk_idx;
941 long int blknr = -1;
942 int inodeno = -1;
943 uint32_t directory_blocks;
944
945 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
946 LOG2_BLOCK_SIZE(ext4fs_root);
947
948
949 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
950 blknr = read_allocated_block(g_parent_inode, blk_idx, NULL);
951 if (blknr <= 0)
952 break;
953 inodeno = unlink_filename(filename, blknr);
954 if (inodeno != -1)
955 return inodeno;
956 }
957
958 return -1;
959}
960
961uint32_t ext4fs_get_new_blk_no(void)
962{
963 short i;
964 short status;
965 int remainder;
966 unsigned int bg_idx;
967 static int prev_bg_bitmap_index = -1;
968 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
969 struct ext_filesystem *fs = get_fs();
970 char *journal_buffer = zalloc(fs->blksz);
971 char *zero_buffer = zalloc(fs->blksz);
972 if (!journal_buffer || !zero_buffer)
973 goto fail;
974
975 if (fs->first_pass_bbmap == 0) {
976 for (i = 0; i < fs->no_blkgrp; i++) {
977 struct ext2_block_group *bgd = NULL;
978 bgd = ext4fs_get_group_descriptor(fs, i);
979 if (ext4fs_bg_get_free_blocks(bgd, fs)) {
980 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
981 uint64_t b_bitmap_blk =
982 ext4fs_bg_get_block_id(bgd, fs);
983 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
984 memcpy(fs->blk_bmaps[i], zero_buffer,
985 fs->blksz);
986 put_ext4(b_bitmap_blk * fs->blksz,
987 fs->blk_bmaps[i], fs->blksz);
988 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
989 ext4fs_bg_set_flags(bgd, bg_flags);
990 }
991 fs->curr_blkno =
992 _get_new_blk_no(fs->blk_bmaps[i]);
993 if (fs->curr_blkno == -1)
994
995 continue;
996 fs->curr_blkno = fs->curr_blkno +
997 (i * fs->blksz * 8);
998 fs->first_pass_bbmap++;
999 ext4fs_bg_free_blocks_dec(bgd, fs);
1000 ext4fs_sb_free_blocks_dec(fs->sb);
1001 status = ext4fs_devread(b_bitmap_blk *
1002 fs->sect_perblk,
1003 0, fs->blksz,
1004 journal_buffer);
1005 if (status == 0)
1006 goto fail;
1007 if (ext4fs_log_journal(journal_buffer,
1008 b_bitmap_blk))
1009 goto fail;
1010 goto success;
1011 } else {
1012 debug("no space left on block group %d\n", i);
1013 }
1014 }
1015
1016 goto fail;
1017 } else {
1018 fs->curr_blkno++;
1019restart:
1020
1021 bg_idx = fs->curr_blkno / blk_per_grp;
1022 if (fs->blksz == 1024) {
1023 remainder = fs->curr_blkno % blk_per_grp;
1024 if (!remainder)
1025 bg_idx--;
1026 }
1027
1028
1029
1030
1031
1032 if (bg_idx >= fs->no_blkgrp)
1033 goto fail;
1034
1035 struct ext2_block_group *bgd = NULL;
1036 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1037 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1038 debug("block group %u is full. Skipping\n", bg_idx);
1039 fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1040 if (fs->blksz == 1024)
1041 fs->curr_blkno += 1;
1042 goto restart;
1043 }
1044
1045 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1046 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1047 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1048 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1049 put_ext4(b_bitmap_blk * fs->blksz,
1050 zero_buffer, fs->blksz);
1051 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1052 ext4fs_bg_set_flags(bgd, bg_flags);
1053 }
1054
1055 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1056 bg_idx) != 0) {
1057 debug("going for restart for the block no %ld %u\n",
1058 fs->curr_blkno, bg_idx);
1059 fs->curr_blkno++;
1060 goto restart;
1061 }
1062
1063
1064 if (prev_bg_bitmap_index != bg_idx) {
1065 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1066 0, fs->blksz, journal_buffer);
1067 if (status == 0)
1068 goto fail;
1069 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1070 goto fail;
1071
1072 prev_bg_bitmap_index = bg_idx;
1073 }
1074 ext4fs_bg_free_blocks_dec(bgd, fs);
1075 ext4fs_sb_free_blocks_dec(fs->sb);
1076 goto success;
1077 }
1078success:
1079 free(journal_buffer);
1080 free(zero_buffer);
1081
1082 return fs->curr_blkno;
1083fail:
1084 free(journal_buffer);
1085 free(zero_buffer);
1086
1087 return -1;
1088}
1089
1090int ext4fs_get_new_inode_no(void)
1091{
1092 short i;
1093 short status;
1094 unsigned int ibmap_idx;
1095 static int prev_inode_bitmap_index = -1;
1096 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1097 struct ext_filesystem *fs = get_fs();
1098 char *journal_buffer = zalloc(fs->blksz);
1099 char *zero_buffer = zalloc(fs->blksz);
1100 if (!journal_buffer || !zero_buffer)
1101 goto fail;
1102 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1103 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1104
1105 if (fs->first_pass_ibmap == 0) {
1106 for (i = 0; i < fs->no_blkgrp; i++) {
1107 uint32_t free_inodes;
1108 struct ext2_block_group *bgd = NULL;
1109 bgd = ext4fs_get_group_descriptor(fs, i);
1110 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1111 if (free_inodes) {
1112 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1113 uint64_t i_bitmap_blk =
1114 ext4fs_bg_get_inode_id(bgd, fs);
1115 if (has_gdt_chksum)
1116 bgd->bg_itable_unused = free_inodes;
1117 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1118 put_ext4(i_bitmap_blk * fs->blksz,
1119 zero_buffer, fs->blksz);
1120 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1121 ext4fs_bg_set_flags(bgd, bg_flags);
1122 memcpy(fs->inode_bmaps[i],
1123 zero_buffer, fs->blksz);
1124 }
1125 fs->curr_inode_no =
1126 _get_new_inode_no(fs->inode_bmaps[i]);
1127 if (fs->curr_inode_no == -1)
1128
1129 continue;
1130 fs->curr_inode_no = fs->curr_inode_no +
1131 (i * inodes_per_grp);
1132 fs->first_pass_ibmap++;
1133 ext4fs_bg_free_inodes_dec(bgd, fs);
1134 if (has_gdt_chksum)
1135 ext4fs_bg_itable_unused_dec(bgd, fs);
1136 ext4fs_sb_free_inodes_dec(fs->sb);
1137 status = ext4fs_devread(i_bitmap_blk *
1138 fs->sect_perblk,
1139 0, fs->blksz,
1140 journal_buffer);
1141 if (status == 0)
1142 goto fail;
1143 if (ext4fs_log_journal(journal_buffer,
1144 i_bitmap_blk))
1145 goto fail;
1146 goto success;
1147 } else
1148 debug("no inode left on block group %d\n", i);
1149 }
1150 goto fail;
1151 } else {
1152restart:
1153 fs->curr_inode_no++;
1154
1155 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1156 struct ext2_block_group *bgd =
1157 ext4fs_get_group_descriptor(fs, ibmap_idx);
1158 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1159 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1160
1161 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1162 put_ext4(i_bitmap_blk * fs->blksz,
1163 zero_buffer, fs->blksz);
1164 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1165 ext4fs_bg_set_flags(bgd, bg_flags);
1166 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1167 fs->blksz);
1168 }
1169
1170 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1171 fs->inode_bmaps[ibmap_idx],
1172 ibmap_idx) != 0) {
1173 debug("going for restart for the block no %d %u\n",
1174 fs->curr_inode_no, ibmap_idx);
1175 goto restart;
1176 }
1177
1178
1179 if (prev_inode_bitmap_index != ibmap_idx) {
1180 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1181 0, fs->blksz, journal_buffer);
1182 if (status == 0)
1183 goto fail;
1184 if (ext4fs_log_journal(journal_buffer,
1185 le32_to_cpu(bgd->inode_id)))
1186 goto fail;
1187 prev_inode_bitmap_index = ibmap_idx;
1188 }
1189 ext4fs_bg_free_inodes_dec(bgd, fs);
1190 if (has_gdt_chksum)
1191 bgd->bg_itable_unused = bgd->free_inodes;
1192 ext4fs_sb_free_inodes_dec(fs->sb);
1193 goto success;
1194 }
1195
1196success:
1197 free(journal_buffer);
1198 free(zero_buffer);
1199
1200 return fs->curr_inode_no;
1201fail:
1202 free(journal_buffer);
1203 free(zero_buffer);
1204
1205 return -1;
1206
1207}
1208
1209
1210static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1211 unsigned int *total_remaining_blocks,
1212 unsigned int *no_blks_reqd)
1213{
1214 short i;
1215 short status;
1216 long int actual_block_no;
1217 long int si_blockno;
1218
1219 __le32 *si_buffer = NULL;
1220 __le32 *si_start_addr = NULL;
1221 struct ext_filesystem *fs = get_fs();
1222
1223 if (*total_remaining_blocks != 0) {
1224 si_buffer = zalloc(fs->blksz);
1225 if (!si_buffer) {
1226 printf("No Memory\n");
1227 return;
1228 }
1229 si_start_addr = si_buffer;
1230 si_blockno = ext4fs_get_new_blk_no();
1231 if (si_blockno == -1) {
1232 printf("no block left to assign\n");
1233 goto fail;
1234 }
1235 (*no_blks_reqd)++;
1236 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1237
1238 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1239 0, fs->blksz, (char *)si_buffer);
1240 memset(si_buffer, '\0', fs->blksz);
1241 if (status == 0)
1242 goto fail;
1243
1244 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1245 actual_block_no = ext4fs_get_new_blk_no();
1246 if (actual_block_no == -1) {
1247 printf("no block left to assign\n");
1248 goto fail;
1249 }
1250 *si_buffer = cpu_to_le32(actual_block_no);
1251 debug("SIAB %u: %u\n", *si_buffer,
1252 *total_remaining_blocks);
1253
1254 si_buffer++;
1255 (*total_remaining_blocks)--;
1256 if (*total_remaining_blocks == 0)
1257 break;
1258 }
1259
1260
1261 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1262 si_start_addr, fs->blksz);
1263 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1264 }
1265fail:
1266 free(si_start_addr);
1267}
1268
1269static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1270 unsigned int *total_remaining_blocks,
1271 unsigned int *no_blks_reqd)
1272{
1273 short i;
1274 short j;
1275 short status;
1276 long int actual_block_no;
1277
1278 long int di_blockno_parent;
1279 long int di_blockno_child;
1280 __le32 *di_parent_buffer = NULL;
1281 __le32 *di_child_buff = NULL;
1282 __le32 *di_block_start_addr = NULL;
1283 __le32 *di_child_buff_start = NULL;
1284 struct ext_filesystem *fs = get_fs();
1285
1286 if (*total_remaining_blocks != 0) {
1287
1288 di_blockno_parent = ext4fs_get_new_blk_no();
1289 if (di_blockno_parent == -1) {
1290 printf("no block left to assign\n");
1291 goto fail;
1292 }
1293 di_parent_buffer = zalloc(fs->blksz);
1294 if (!di_parent_buffer)
1295 goto fail;
1296
1297 di_block_start_addr = di_parent_buffer;
1298 (*no_blks_reqd)++;
1299 debug("DIPB %ld: %u\n", di_blockno_parent,
1300 *total_remaining_blocks);
1301
1302 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1303 fs->sect_perblk, 0,
1304 fs->blksz, (char *)di_parent_buffer);
1305
1306 if (!status) {
1307 printf("%s: Device read error!\n", __func__);
1308 goto fail;
1309 }
1310 memset(di_parent_buffer, '\0', fs->blksz);
1311
1312
1313
1314
1315
1316 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1317 di_blockno_child = ext4fs_get_new_blk_no();
1318 if (di_blockno_child == -1) {
1319 printf("no block left to assign\n");
1320 goto fail;
1321 }
1322 di_child_buff = zalloc(fs->blksz);
1323 if (!di_child_buff)
1324 goto fail;
1325
1326 di_child_buff_start = di_child_buff;
1327 *di_parent_buffer = cpu_to_le32(di_blockno_child);
1328 di_parent_buffer++;
1329 (*no_blks_reqd)++;
1330 debug("DICB %ld: %u\n", di_blockno_child,
1331 *total_remaining_blocks);
1332
1333 status = ext4fs_devread((lbaint_t)di_blockno_child *
1334 fs->sect_perblk, 0,
1335 fs->blksz,
1336 (char *)di_child_buff);
1337
1338 if (!status) {
1339 printf("%s: Device read error!\n", __func__);
1340 goto fail;
1341 }
1342 memset(di_child_buff, '\0', fs->blksz);
1343
1344 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1345 actual_block_no = ext4fs_get_new_blk_no();
1346 if (actual_block_no == -1) {
1347 printf("no block left to assign\n");
1348 goto fail;
1349 }
1350 *di_child_buff = cpu_to_le32(actual_block_no);
1351 debug("DIAB %ld: %u\n", actual_block_no,
1352 *total_remaining_blocks);
1353
1354 di_child_buff++;
1355 (*total_remaining_blocks)--;
1356 if (*total_remaining_blocks == 0)
1357 break;
1358 }
1359
1360 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1361 di_child_buff_start, fs->blksz);
1362 free(di_child_buff_start);
1363 di_child_buff_start = NULL;
1364
1365 if (*total_remaining_blocks == 0)
1366 break;
1367 }
1368 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1369 di_block_start_addr, fs->blksz);
1370 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1371 }
1372fail:
1373 free(di_block_start_addr);
1374}
1375
1376static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1377 unsigned int *total_remaining_blocks,
1378 unsigned int *no_blks_reqd)
1379{
1380 short i;
1381 short j;
1382 short k;
1383 long int actual_block_no;
1384
1385 long int ti_gp_blockno;
1386 long int ti_parent_blockno;
1387 long int ti_child_blockno;
1388 __le32 *ti_gp_buff = NULL;
1389 __le32 *ti_parent_buff = NULL;
1390 __le32 *ti_child_buff = NULL;
1391 __le32 *ti_gp_buff_start_addr = NULL;
1392 __le32 *ti_pbuff_start_addr = NULL;
1393 __le32 *ti_cbuff_start_addr = NULL;
1394 struct ext_filesystem *fs = get_fs();
1395 if (*total_remaining_blocks != 0) {
1396
1397 ti_gp_blockno = ext4fs_get_new_blk_no();
1398 if (ti_gp_blockno == -1) {
1399 printf("no block left to assign\n");
1400 return;
1401 }
1402 ti_gp_buff = zalloc(fs->blksz);
1403 if (!ti_gp_buff)
1404 return;
1405
1406 ti_gp_buff_start_addr = ti_gp_buff;
1407 (*no_blks_reqd)++;
1408 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1409 *total_remaining_blocks);
1410
1411
1412 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1413 ti_parent_blockno = ext4fs_get_new_blk_no();
1414 if (ti_parent_blockno == -1) {
1415 printf("no block left to assign\n");
1416 goto fail;
1417 }
1418 ti_parent_buff = zalloc(fs->blksz);
1419 if (!ti_parent_buff)
1420 goto fail;
1421
1422 ti_pbuff_start_addr = ti_parent_buff;
1423 *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1424 ti_gp_buff++;
1425 (*no_blks_reqd)++;
1426 debug("TIPB %ld: %u\n", ti_parent_blockno,
1427 *total_remaining_blocks);
1428
1429
1430 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1431 ti_child_blockno = ext4fs_get_new_blk_no();
1432 if (ti_child_blockno == -1) {
1433 printf("no block left assign\n");
1434 goto fail1;
1435 }
1436 ti_child_buff = zalloc(fs->blksz);
1437 if (!ti_child_buff)
1438 goto fail1;
1439
1440 ti_cbuff_start_addr = ti_child_buff;
1441 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1442 ti_parent_buff++;
1443 (*no_blks_reqd)++;
1444 debug("TICB %ld: %u\n", ti_parent_blockno,
1445 *total_remaining_blocks);
1446
1447
1448 for (k = 0; k < (fs->blksz / sizeof(int));
1449 k++) {
1450 actual_block_no =
1451 ext4fs_get_new_blk_no();
1452 if (actual_block_no == -1) {
1453 printf("no block left\n");
1454 free(ti_cbuff_start_addr);
1455 goto fail1;
1456 }
1457 *ti_child_buff = cpu_to_le32(actual_block_no);
1458 debug("TIAB %ld: %u\n", actual_block_no,
1459 *total_remaining_blocks);
1460
1461 ti_child_buff++;
1462 (*total_remaining_blocks)--;
1463 if (*total_remaining_blocks == 0)
1464 break;
1465 }
1466
1467 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1468 (uint64_t)fs->blksz)),
1469 ti_cbuff_start_addr, fs->blksz);
1470 free(ti_cbuff_start_addr);
1471
1472 if (*total_remaining_blocks == 0)
1473 break;
1474 }
1475
1476 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1477 ti_pbuff_start_addr, fs->blksz);
1478 free(ti_pbuff_start_addr);
1479
1480 if (*total_remaining_blocks == 0)
1481 break;
1482 }
1483
1484 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1485 ti_gp_buff_start_addr, fs->blksz);
1486 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1487 free(ti_gp_buff_start_addr);
1488 return;
1489 }
1490fail1:
1491 free(ti_pbuff_start_addr);
1492fail:
1493 free(ti_gp_buff_start_addr);
1494}
1495
1496void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1497 unsigned int total_remaining_blocks,
1498 unsigned int *total_no_of_block)
1499{
1500 short i;
1501 long int direct_blockno;
1502 unsigned int no_blks_reqd = 0;
1503
1504
1505 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1506 direct_blockno = ext4fs_get_new_blk_no();
1507 if (direct_blockno == -1) {
1508 printf("no block left to assign\n");
1509 return;
1510 }
1511 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1512 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1513
1514 total_remaining_blocks--;
1515 }
1516
1517 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1518 &no_blks_reqd);
1519 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1520 &no_blks_reqd);
1521 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1522 &no_blks_reqd);
1523 *total_no_of_block += no_blks_reqd;
1524}
1525
1526#endif
1527
1528static struct ext4_extent_header *ext4fs_get_extent_block
1529 (struct ext2_data *data, struct ext_block_cache *cache,
1530 struct ext4_extent_header *ext_block,
1531 uint32_t fileblock, int log2_blksz)
1532{
1533 struct ext4_extent_idx *index;
1534 unsigned long long block;
1535 int blksz = EXT2_BLOCK_SIZE(data);
1536 int i;
1537
1538 while (1) {
1539 index = (struct ext4_extent_idx *)(ext_block + 1);
1540
1541 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1542 return NULL;
1543
1544 if (ext_block->eh_depth == 0)
1545 return ext_block;
1546 i = -1;
1547 do {
1548 i++;
1549 if (i >= le16_to_cpu(ext_block->eh_entries))
1550 break;
1551 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1552
1553
1554
1555
1556
1557 if (i > 0)
1558 i--;
1559
1560 block = le16_to_cpu(index[i].ei_leaf_hi);
1561 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1562 block <<= log2_blksz;
1563 if (!ext_cache_read(cache, (lbaint_t)block, blksz))
1564 return NULL;
1565 ext_block = (struct ext4_extent_header *)cache->buf;
1566 }
1567}
1568
1569static int ext4fs_blockgroup
1570 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1571{
1572 long int blkno;
1573 unsigned int blkoff, desc_per_blk;
1574 int log2blksz = get_fs()->dev_desc->log2blksz;
1575 int desc_size = get_fs()->gdsize;
1576
1577 if (desc_size == 0)
1578 return 0;
1579 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1580
1581 if (desc_per_blk == 0)
1582 return 0;
1583 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1584 group / desc_per_blk;
1585 blkoff = (group % desc_per_blk) * desc_size;
1586
1587 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1588 group, blkno, blkoff);
1589
1590 return ext4fs_devread((lbaint_t)blkno <<
1591 (LOG2_BLOCK_SIZE(data) - log2blksz),
1592 blkoff, desc_size, (char *)blkgrp);
1593}
1594
1595int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1596{
1597 struct ext2_block_group *blkgrp;
1598 struct ext2_sblock *sblock = &data->sblock;
1599 struct ext_filesystem *fs = get_fs();
1600 int log2blksz = get_fs()->dev_desc->log2blksz;
1601 int inodes_per_block, status;
1602 long int blkno;
1603 unsigned int blkoff;
1604
1605
1606 blkgrp = zalloc(get_fs()->gdsize);
1607 if (!blkgrp)
1608 return 0;
1609
1610
1611 ino--;
1612 if ( le32_to_cpu(sblock->inodes_per_group) == 0 || fs->inodesz == 0) {
1613 free(blkgrp);
1614 return 0;
1615 }
1616 status = ext4fs_blockgroup(data, ino / le32_to_cpu
1617 (sblock->inodes_per_group), blkgrp);
1618 if (status == 0) {
1619 free(blkgrp);
1620 return 0;
1621 }
1622
1623 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1624 if ( inodes_per_block == 0 ) {
1625 free(blkgrp);
1626 return 0;
1627 }
1628 blkno = ext4fs_bg_get_inode_table_id(blkgrp, fs) +
1629 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1630 blkoff = (ino % inodes_per_block) * fs->inodesz;
1631
1632
1633 free(blkgrp);
1634
1635
1636 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1637 log2blksz), blkoff,
1638 sizeof(struct ext2_inode), (char *)inode);
1639 if (status == 0)
1640 return 0;
1641
1642 return 1;
1643}
1644
1645long int read_allocated_block(struct ext2_inode *inode, int fileblock,
1646 struct ext_block_cache *cache)
1647{
1648 long int blknr;
1649 int blksz;
1650 int log2_blksz;
1651 int status;
1652 long int rblock;
1653 long int perblock_parent;
1654 long int perblock_child;
1655 unsigned long long start;
1656
1657 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1658 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1659 - get_fs()->dev_desc->log2blksz;
1660
1661 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1662 long int startblock, endblock;
1663 struct ext_block_cache *c, cd;
1664 struct ext4_extent_header *ext_block;
1665 struct ext4_extent *extent;
1666 int i;
1667
1668 if (cache) {
1669 c = cache;
1670 } else {
1671 c = &cd;
1672 ext_cache_init(c);
1673 }
1674 ext_block =
1675 ext4fs_get_extent_block(ext4fs_root, c,
1676 (struct ext4_extent_header *)
1677 inode->b.blocks.dir_blocks,
1678 fileblock, log2_blksz);
1679 if (!ext_block) {
1680 printf("invalid extent block\n");
1681 if (!cache)
1682 ext_cache_fini(c);
1683 return -EINVAL;
1684 }
1685
1686 extent = (struct ext4_extent *)(ext_block + 1);
1687
1688 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1689 startblock = le32_to_cpu(extent[i].ee_block);
1690 endblock = startblock + le16_to_cpu(extent[i].ee_len);
1691
1692 if (startblock > fileblock) {
1693
1694 if (!cache)
1695 ext_cache_fini(c);
1696 return 0;
1697
1698 } else if (fileblock < endblock) {
1699 start = le16_to_cpu(extent[i].ee_start_hi);
1700 start = (start << 32) +
1701 le32_to_cpu(extent[i].ee_start_lo);
1702 if (!cache)
1703 ext_cache_fini(c);
1704 return (fileblock - startblock) + start;
1705 }
1706 }
1707
1708 if (!cache)
1709 ext_cache_fini(c);
1710 return 0;
1711 }
1712
1713
1714 if (fileblock < INDIRECT_BLOCKS)
1715 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1716
1717
1718 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1719 if (ext4fs_indir1_block == NULL) {
1720 ext4fs_indir1_block = zalloc(blksz);
1721 if (ext4fs_indir1_block == NULL) {
1722 printf("** SI ext2fs read block (indir 1)"
1723 "malloc failed. **\n");
1724 return -1;
1725 }
1726 ext4fs_indir1_size = blksz;
1727 ext4fs_indir1_blkno = -1;
1728 }
1729 if (blksz != ext4fs_indir1_size) {
1730 free(ext4fs_indir1_block);
1731 ext4fs_indir1_block = NULL;
1732 ext4fs_indir1_size = 0;
1733 ext4fs_indir1_blkno = -1;
1734 ext4fs_indir1_block = zalloc(blksz);
1735 if (ext4fs_indir1_block == NULL) {
1736 printf("** SI ext2fs read block (indir 1):"
1737 "malloc failed. **\n");
1738 return -1;
1739 }
1740 ext4fs_indir1_size = blksz;
1741 }
1742 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1743 log2_blksz) != ext4fs_indir1_blkno) {
1744 status =
1745 ext4fs_devread((lbaint_t)le32_to_cpu
1746 (inode->b.blocks.
1747 indir_block) << log2_blksz, 0,
1748 blksz, (char *)ext4fs_indir1_block);
1749 if (status == 0) {
1750 printf("** SI ext2fs read block (indir 1)"
1751 "failed. **\n");
1752 return -1;
1753 }
1754 ext4fs_indir1_blkno =
1755 le32_to_cpu(inode->b.blocks.
1756 indir_block) << log2_blksz;
1757 }
1758 blknr = le32_to_cpu(ext4fs_indir1_block
1759 [fileblock - INDIRECT_BLOCKS]);
1760 }
1761
1762 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1763 (blksz / 4 + 1)))) {
1764
1765 long int perblock = blksz / 4;
1766 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1767
1768 if (ext4fs_indir1_block == NULL) {
1769 ext4fs_indir1_block = zalloc(blksz);
1770 if (ext4fs_indir1_block == NULL) {
1771 printf("** DI ext2fs read block (indir 2 1)"
1772 "malloc failed. **\n");
1773 return -1;
1774 }
1775 ext4fs_indir1_size = blksz;
1776 ext4fs_indir1_blkno = -1;
1777 }
1778 if (blksz != ext4fs_indir1_size) {
1779 free(ext4fs_indir1_block);
1780 ext4fs_indir1_block = NULL;
1781 ext4fs_indir1_size = 0;
1782 ext4fs_indir1_blkno = -1;
1783 ext4fs_indir1_block = zalloc(blksz);
1784 if (ext4fs_indir1_block == NULL) {
1785 printf("** DI ext2fs read block (indir 2 1)"
1786 "malloc failed. **\n");
1787 return -1;
1788 }
1789 ext4fs_indir1_size = blksz;
1790 }
1791 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1792 log2_blksz) != ext4fs_indir1_blkno) {
1793 status =
1794 ext4fs_devread((lbaint_t)le32_to_cpu
1795 (inode->b.blocks.
1796 double_indir_block) << log2_blksz,
1797 0, blksz,
1798 (char *)ext4fs_indir1_block);
1799 if (status == 0) {
1800 printf("** DI ext2fs read block (indir 2 1)"
1801 "failed. **\n");
1802 return -1;
1803 }
1804 ext4fs_indir1_blkno =
1805 le32_to_cpu(inode->b.blocks.double_indir_block) <<
1806 log2_blksz;
1807 }
1808
1809 if (ext4fs_indir2_block == NULL) {
1810 ext4fs_indir2_block = zalloc(blksz);
1811 if (ext4fs_indir2_block == NULL) {
1812 printf("** DI ext2fs read block (indir 2 2)"
1813 "malloc failed. **\n");
1814 return -1;
1815 }
1816 ext4fs_indir2_size = blksz;
1817 ext4fs_indir2_blkno = -1;
1818 }
1819 if (blksz != ext4fs_indir2_size) {
1820 free(ext4fs_indir2_block);
1821 ext4fs_indir2_block = NULL;
1822 ext4fs_indir2_size = 0;
1823 ext4fs_indir2_blkno = -1;
1824 ext4fs_indir2_block = zalloc(blksz);
1825 if (ext4fs_indir2_block == NULL) {
1826 printf("** DI ext2fs read block (indir 2 2)"
1827 "malloc failed. **\n");
1828 return -1;
1829 }
1830 ext4fs_indir2_size = blksz;
1831 }
1832 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1833 log2_blksz) != ext4fs_indir2_blkno) {
1834 status = ext4fs_devread((lbaint_t)le32_to_cpu
1835 (ext4fs_indir1_block
1836 [rblock /
1837 perblock]) << log2_blksz, 0,
1838 blksz,
1839 (char *)ext4fs_indir2_block);
1840 if (status == 0) {
1841 printf("** DI ext2fs read block (indir 2 2)"
1842 "failed. **\n");
1843 return -1;
1844 }
1845 ext4fs_indir2_blkno =
1846 le32_to_cpu(ext4fs_indir1_block[rblock
1847 /
1848 perblock]) <<
1849 log2_blksz;
1850 }
1851 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1852 }
1853
1854 else {
1855 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1856 (blksz / 4 * blksz / 4));
1857 perblock_child = blksz / 4;
1858 perblock_parent = ((blksz / 4) * (blksz / 4));
1859
1860 if (ext4fs_indir1_block == NULL) {
1861 ext4fs_indir1_block = zalloc(blksz);
1862 if (ext4fs_indir1_block == NULL) {
1863 printf("** TI ext2fs read block (indir 2 1)"
1864 "malloc failed. **\n");
1865 return -1;
1866 }
1867 ext4fs_indir1_size = blksz;
1868 ext4fs_indir1_blkno = -1;
1869 }
1870 if (blksz != ext4fs_indir1_size) {
1871 free(ext4fs_indir1_block);
1872 ext4fs_indir1_block = NULL;
1873 ext4fs_indir1_size = 0;
1874 ext4fs_indir1_blkno = -1;
1875 ext4fs_indir1_block = zalloc(blksz);
1876 if (ext4fs_indir1_block == NULL) {
1877 printf("** TI ext2fs read block (indir 2 1)"
1878 "malloc failed. **\n");
1879 return -1;
1880 }
1881 ext4fs_indir1_size = blksz;
1882 }
1883 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1884 log2_blksz) != ext4fs_indir1_blkno) {
1885 status = ext4fs_devread
1886 ((lbaint_t)
1887 le32_to_cpu(inode->b.blocks.triple_indir_block)
1888 << log2_blksz, 0, blksz,
1889 (char *)ext4fs_indir1_block);
1890 if (status == 0) {
1891 printf("** TI ext2fs read block (indir 2 1)"
1892 "failed. **\n");
1893 return -1;
1894 }
1895 ext4fs_indir1_blkno =
1896 le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1897 log2_blksz;
1898 }
1899
1900 if (ext4fs_indir2_block == NULL) {
1901 ext4fs_indir2_block = zalloc(blksz);
1902 if (ext4fs_indir2_block == NULL) {
1903 printf("** TI ext2fs read block (indir 2 2)"
1904 "malloc failed. **\n");
1905 return -1;
1906 }
1907 ext4fs_indir2_size = blksz;
1908 ext4fs_indir2_blkno = -1;
1909 }
1910 if (blksz != ext4fs_indir2_size) {
1911 free(ext4fs_indir2_block);
1912 ext4fs_indir2_block = NULL;
1913 ext4fs_indir2_size = 0;
1914 ext4fs_indir2_blkno = -1;
1915 ext4fs_indir2_block = zalloc(blksz);
1916 if (ext4fs_indir2_block == NULL) {
1917 printf("** TI ext2fs read block (indir 2 2)"
1918 "malloc failed. **\n");
1919 return -1;
1920 }
1921 ext4fs_indir2_size = blksz;
1922 }
1923 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1924 perblock_parent]) <<
1925 log2_blksz)
1926 != ext4fs_indir2_blkno) {
1927 status = ext4fs_devread((lbaint_t)le32_to_cpu
1928 (ext4fs_indir1_block
1929 [rblock /
1930 perblock_parent]) <<
1931 log2_blksz, 0, blksz,
1932 (char *)ext4fs_indir2_block);
1933 if (status == 0) {
1934 printf("** TI ext2fs read block (indir 2 2)"
1935 "failed. **\n");
1936 return -1;
1937 }
1938 ext4fs_indir2_blkno =
1939 le32_to_cpu(ext4fs_indir1_block[rblock /
1940 perblock_parent])
1941 << log2_blksz;
1942 }
1943
1944 if (ext4fs_indir3_block == NULL) {
1945 ext4fs_indir3_block = zalloc(blksz);
1946 if (ext4fs_indir3_block == NULL) {
1947 printf("** TI ext2fs read block (indir 2 2)"
1948 "malloc failed. **\n");
1949 return -1;
1950 }
1951 ext4fs_indir3_size = blksz;
1952 ext4fs_indir3_blkno = -1;
1953 }
1954 if (blksz != ext4fs_indir3_size) {
1955 free(ext4fs_indir3_block);
1956 ext4fs_indir3_block = NULL;
1957 ext4fs_indir3_size = 0;
1958 ext4fs_indir3_blkno = -1;
1959 ext4fs_indir3_block = zalloc(blksz);
1960 if (ext4fs_indir3_block == NULL) {
1961 printf("** TI ext2fs read block (indir 2 2)"
1962 "malloc failed. **\n");
1963 return -1;
1964 }
1965 ext4fs_indir3_size = blksz;
1966 }
1967 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1968 /
1969 perblock_child]) <<
1970 log2_blksz) != ext4fs_indir3_blkno) {
1971 status =
1972 ext4fs_devread((lbaint_t)le32_to_cpu
1973 (ext4fs_indir2_block
1974 [(rblock / perblock_child)
1975 % (blksz / 4)]) << log2_blksz, 0,
1976 blksz, (char *)ext4fs_indir3_block);
1977 if (status == 0) {
1978 printf("** TI ext2fs read block (indir 2 2)"
1979 "failed. **\n");
1980 return -1;
1981 }
1982 ext4fs_indir3_blkno =
1983 le32_to_cpu(ext4fs_indir2_block[(rblock /
1984 perblock_child) %
1985 (blksz /
1986 4)]) <<
1987 log2_blksz;
1988 }
1989
1990 blknr = le32_to_cpu(ext4fs_indir3_block
1991 [rblock % perblock_child]);
1992 }
1993 debug("read_allocated_block %ld\n", blknr);
1994
1995 return blknr;
1996}
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010void ext4fs_reinit_global(void)
2011{
2012 if (ext4fs_indir1_block != NULL) {
2013 free(ext4fs_indir1_block);
2014 ext4fs_indir1_block = NULL;
2015 ext4fs_indir1_size = 0;
2016 ext4fs_indir1_blkno = -1;
2017 }
2018 if (ext4fs_indir2_block != NULL) {
2019 free(ext4fs_indir2_block);
2020 ext4fs_indir2_block = NULL;
2021 ext4fs_indir2_size = 0;
2022 ext4fs_indir2_blkno = -1;
2023 }
2024 if (ext4fs_indir3_block != NULL) {
2025 free(ext4fs_indir3_block);
2026 ext4fs_indir3_block = NULL;
2027 ext4fs_indir3_size = 0;
2028 ext4fs_indir3_blkno = -1;
2029 }
2030}
2031void ext4fs_close(void)
2032{
2033 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
2034 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
2035 ext4fs_file = NULL;
2036 }
2037 if (ext4fs_root != NULL) {
2038 free(ext4fs_root);
2039 ext4fs_root = NULL;
2040 }
2041
2042 ext4fs_reinit_global();
2043}
2044
2045int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2046 struct ext2fs_node **fnode, int *ftype)
2047{
2048 unsigned int fpos = 0;
2049 int status;
2050 loff_t actread;
2051 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2052
2053#ifdef DEBUG
2054 if (name != NULL)
2055 printf("Iterate dir %s\n", name);
2056#endif
2057 if (!diro->inode_read) {
2058 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2059 if (status == 0)
2060 return 0;
2061 }
2062
2063 while (fpos < le32_to_cpu(diro->inode.size)) {
2064 struct ext2_dirent dirent;
2065
2066 status = ext4fs_read_file(diro, fpos,
2067 sizeof(struct ext2_dirent),
2068 (char *)&dirent, &actread);
2069 if (status < 0)
2070 return 0;
2071
2072 if (dirent.direntlen == 0) {
2073 printf("Failed to iterate over directory %s\n", name);
2074 return 0;
2075 }
2076
2077 if (dirent.namelen != 0) {
2078 char filename[dirent.namelen + 1];
2079 struct ext2fs_node *fdiro;
2080 int type = FILETYPE_UNKNOWN;
2081
2082 status = ext4fs_read_file(diro,
2083 fpos +
2084 sizeof(struct ext2_dirent),
2085 dirent.namelen, filename,
2086 &actread);
2087 if (status < 0)
2088 return 0;
2089
2090 fdiro = zalloc(sizeof(struct ext2fs_node));
2091 if (!fdiro)
2092 return 0;
2093
2094 fdiro->data = diro->data;
2095 fdiro->ino = le32_to_cpu(dirent.inode);
2096
2097 filename[dirent.namelen] = '\0';
2098
2099 if (dirent.filetype != FILETYPE_UNKNOWN) {
2100 fdiro->inode_read = 0;
2101
2102 if (dirent.filetype == FILETYPE_DIRECTORY)
2103 type = FILETYPE_DIRECTORY;
2104 else if (dirent.filetype == FILETYPE_SYMLINK)
2105 type = FILETYPE_SYMLINK;
2106 else if (dirent.filetype == FILETYPE_REG)
2107 type = FILETYPE_REG;
2108 } else {
2109 status = ext4fs_read_inode(diro->data,
2110 le32_to_cpu
2111 (dirent.inode),
2112 &fdiro->inode);
2113 if (status == 0) {
2114 free(fdiro);
2115 return 0;
2116 }
2117 fdiro->inode_read = 1;
2118
2119 if ((le16_to_cpu(fdiro->inode.mode) &
2120 FILETYPE_INO_MASK) ==
2121 FILETYPE_INO_DIRECTORY) {
2122 type = FILETYPE_DIRECTORY;
2123 } else if ((le16_to_cpu(fdiro->inode.mode)
2124 & FILETYPE_INO_MASK) ==
2125 FILETYPE_INO_SYMLINK) {
2126 type = FILETYPE_SYMLINK;
2127 } else if ((le16_to_cpu(fdiro->inode.mode)
2128 & FILETYPE_INO_MASK) ==
2129 FILETYPE_INO_REG) {
2130 type = FILETYPE_REG;
2131 }
2132 }
2133#ifdef DEBUG
2134 printf("iterate >%s<\n", filename);
2135#endif
2136 if ((name != NULL) && (fnode != NULL)
2137 && (ftype != NULL)) {
2138 if (strcmp(filename, name) == 0) {
2139 *ftype = type;
2140 *fnode = fdiro;
2141 return 1;
2142 }
2143 } else {
2144 if (fdiro->inode_read == 0) {
2145 status = ext4fs_read_inode(diro->data,
2146 le32_to_cpu(
2147 dirent.inode),
2148 &fdiro->inode);
2149 if (status == 0) {
2150 free(fdiro);
2151 return 0;
2152 }
2153 fdiro->inode_read = 1;
2154 }
2155 switch (type) {
2156 case FILETYPE_DIRECTORY:
2157 printf("<DIR> ");
2158 break;
2159 case FILETYPE_SYMLINK:
2160 printf("<SYM> ");
2161 break;
2162 case FILETYPE_REG:
2163 printf(" ");
2164 break;
2165 default:
2166 printf("< ? > ");
2167 break;
2168 }
2169 printf("%10u %s\n",
2170 le32_to_cpu(fdiro->inode.size),
2171 filename);
2172 }
2173 free(fdiro);
2174 }
2175 fpos += le16_to_cpu(dirent.direntlen);
2176 }
2177 return 0;
2178}
2179
2180static char *ext4fs_read_symlink(struct ext2fs_node *node)
2181{
2182 char *symlink;
2183 struct ext2fs_node *diro = node;
2184 int status;
2185 loff_t actread;
2186
2187 if (!diro->inode_read) {
2188 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2189 if (status == 0)
2190 return NULL;
2191 }
2192 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2193 if (!symlink)
2194 return NULL;
2195
2196 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2197 strncpy(symlink, diro->inode.b.symlink,
2198 le32_to_cpu(diro->inode.size));
2199 } else {
2200 status = ext4fs_read_file(diro, 0,
2201 le32_to_cpu(diro->inode.size),
2202 symlink, &actread);
2203 if ((status < 0) || (actread == 0)) {
2204 free(symlink);
2205 return NULL;
2206 }
2207 }
2208 symlink[le32_to_cpu(diro->inode.size)] = '\0';
2209 return symlink;
2210}
2211
2212static int ext4fs_find_file1(const char *currpath,
2213 struct ext2fs_node *currroot,
2214 struct ext2fs_node **currfound, int *foundtype)
2215{
2216 char fpath[strlen(currpath) + 1];
2217 char *name = fpath;
2218 char *next;
2219 int status;
2220 int type = FILETYPE_DIRECTORY;
2221 struct ext2fs_node *currnode = currroot;
2222 struct ext2fs_node *oldnode = currroot;
2223
2224 strncpy(fpath, currpath, strlen(currpath) + 1);
2225
2226
2227 while (*name == '/')
2228 name++;
2229
2230 if (!*name) {
2231 *currfound = currnode;
2232 return 1;
2233 }
2234
2235 for (;;) {
2236 int found;
2237
2238
2239 next = strchr(name, '/');
2240 if (next) {
2241
2242 while (*next == '/')
2243 *(next++) = '\0';
2244 }
2245
2246 if (type != FILETYPE_DIRECTORY) {
2247 ext4fs_free_node(currnode, currroot);
2248 return 0;
2249 }
2250
2251 oldnode = currnode;
2252
2253
2254 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2255 if (found == 0)
2256 return 0;
2257
2258 if (found == -1)
2259 break;
2260
2261
2262 if (type == FILETYPE_SYMLINK) {
2263 char *symlink;
2264
2265
2266 if (++symlinknest == 8) {
2267 ext4fs_free_node(currnode, currroot);
2268 ext4fs_free_node(oldnode, currroot);
2269 return 0;
2270 }
2271
2272 symlink = ext4fs_read_symlink(currnode);
2273 ext4fs_free_node(currnode, currroot);
2274
2275 if (!symlink) {
2276 ext4fs_free_node(oldnode, currroot);
2277 return 0;
2278 }
2279
2280 debug("Got symlink >%s<\n", symlink);
2281
2282 if (symlink[0] == '/') {
2283 ext4fs_free_node(oldnode, currroot);
2284 oldnode = &ext4fs_root->diropen;
2285 }
2286
2287
2288 status = ext4fs_find_file1(symlink, oldnode,
2289 &currnode, &type);
2290
2291 free(symlink);
2292
2293 if (status == 0) {
2294 ext4fs_free_node(oldnode, currroot);
2295 return 0;
2296 }
2297 }
2298
2299 ext4fs_free_node(oldnode, currroot);
2300
2301
2302 if (!next || *next == '\0') {
2303 *currfound = currnode;
2304 *foundtype = type;
2305 return 1;
2306 }
2307 name = next;
2308 }
2309 return -1;
2310}
2311
2312int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2313 struct ext2fs_node **foundnode, int expecttype)
2314{
2315 int status;
2316 int foundtype = FILETYPE_DIRECTORY;
2317
2318 symlinknest = 0;
2319 if (!path)
2320 return 0;
2321
2322 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2323 if (status == 0)
2324 return 0;
2325
2326
2327 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2328 return 0;
2329 else if ((expecttype == FILETYPE_DIRECTORY)
2330 && (foundtype != expecttype))
2331 return 0;
2332
2333 return 1;
2334}
2335
2336int ext4fs_open(const char *filename, loff_t *len)
2337{
2338 struct ext2fs_node *fdiro = NULL;
2339 int status;
2340
2341 if (ext4fs_root == NULL)
2342 return -1;
2343
2344 ext4fs_file = NULL;
2345 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2346 FILETYPE_REG);
2347 if (status == 0)
2348 goto fail;
2349
2350 if (!fdiro->inode_read) {
2351 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2352 &fdiro->inode);
2353 if (status == 0)
2354 goto fail;
2355 }
2356 *len = le32_to_cpu(fdiro->inode.size);
2357 ext4fs_file = fdiro;
2358
2359 return 0;
2360fail:
2361 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2362
2363 return -1;
2364}
2365
2366int ext4fs_mount(unsigned part_length)
2367{
2368 struct ext2_data *data;
2369 int status;
2370 struct ext_filesystem *fs = get_fs();
2371 data = zalloc(SUPERBLOCK_SIZE);
2372 if (!data)
2373 return 0;
2374
2375
2376 status = ext4_read_superblock((char *)&data->sblock);
2377
2378 if (status == 0)
2379 goto fail;
2380
2381
2382 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2383 goto fail_noerr;
2384
2385
2386 if (le32_to_cpu(data->sblock.revision_level) == 0) {
2387 fs->inodesz = 128;
2388 fs->gdsize = 32;
2389 } else {
2390 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2391 __le32_to_cpu(data->sblock.feature_compatibility),
2392 __le32_to_cpu(data->sblock.feature_incompat),
2393 __le32_to_cpu(data->sblock.feature_ro_compat));
2394
2395 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2396 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2397 EXT4_FEATURE_INCOMPAT_64BIT ?
2398 le16_to_cpu(data->sblock.descriptor_size) : 32;
2399 }
2400
2401 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2402 le32_to_cpu(data->sblock.revision_level),
2403 fs->inodesz, fs->gdsize);
2404
2405 data->diropen.data = data;
2406 data->diropen.ino = 2;
2407 data->diropen.inode_read = 1;
2408 data->inode = &data->diropen.inode;
2409
2410 status = ext4fs_read_inode(data, 2, data->inode);
2411 if (status == 0)
2412 goto fail;
2413
2414 ext4fs_root = data;
2415
2416 return 1;
2417fail:
2418 printf("Failed to mount ext2 filesystem...\n");
2419fail_noerr:
2420 free(data);
2421 ext4fs_root = NULL;
2422
2423 return 0;
2424}
2425
