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Merge branch 'master' of git://git.denx.de/u-boot-spi
[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 struct ext2_block_group *ext4fs_get_group_descriptor
51 (const struct ext_filesystem *fs, uint32_t bg_idx)
52 {
53 return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
54 }
55
56 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
57 {
58 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
59 }
60
61 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
62 {
63 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
64 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
65 free_blocks--;
66
67 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
68 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
69 }
70
71 static inline void ext4fs_bg_free_inodes_dec
72 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
73 {
74 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
75 if (fs->gdsize == 64)
76 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
77 free_inodes--;
78
79 bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
80 if (fs->gdsize == 64)
81 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
82 }
83
84 static inline void ext4fs_bg_free_blocks_dec
85 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
86 {
87 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
88 if (fs->gdsize == 64)
89 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
90 free_blocks--;
91
92 bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
93 if (fs->gdsize == 64)
94 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
95 }
96
97 static inline void ext4fs_bg_itable_unused_dec
98 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
99 {
100 uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
101 if (fs->gdsize == 64)
102 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
103 free_inodes--;
104
105 bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
106 if (fs->gdsize == 64)
107 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
108 }
109
110 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
111 {
112 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
113 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
114 return free_blocks;
115 }
116
117 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
118 {
119 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
120 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
121 }
122
123 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
124 const struct ext_filesystem *fs)
125 {
126 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
127 if (fs->gdsize == 64)
128 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
129 return free_blocks;
130 }
131
132 static inline
133 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
134 const struct ext_filesystem *fs)
135 {
136 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
137 if (fs->gdsize == 64)
138 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
139 return free_inodes;
140 }
141
142 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
143 {
144 return le16_to_cpu(bg->bg_flags);
145 }
146
147 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
148 uint16_t flags)
149 {
150 bg->bg_flags = cpu_to_le16(flags);
151 }
152
153 /* Block number of the block bitmap */
154 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
155 const struct ext_filesystem *fs)
156 {
157 uint64_t block_nr = le32_to_cpu(bg->block_id);
158 if (fs->gdsize == 64)
159 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
160 return block_nr;
161 }
162
163 /* Block number of the inode bitmap */
164 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
165 const struct ext_filesystem *fs)
166 {
167 uint64_t block_nr = le32_to_cpu(bg->inode_id);
168 if (fs->gdsize == 64)
169 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
170 return block_nr;
171 }
172 #endif
173
174 /* Block number of the inode table */
175 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
176 const struct ext_filesystem *fs)
177 {
178 uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
179 if (fs->gdsize == 64)
180 block_nr +=
181 (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
182 return block_nr;
183 }
184
185 #if defined(CONFIG_EXT4_WRITE)
186 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
187 {
188 uint32_t res = size / n;
189 if (res * n != size)
190 res++;
191
192 return res;
193 }
194
195 void put_ext4(uint64_t off, void *buf, uint32_t size)
196 {
197 uint64_t startblock;
198 uint64_t remainder;
199 unsigned char *temp_ptr = NULL;
200 struct ext_filesystem *fs = get_fs();
201 int log2blksz = fs->dev_desc->log2blksz;
202 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
203
204 startblock = off >> log2blksz;
205 startblock += part_offset;
206 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
207
208 if (fs->dev_desc == NULL)
209 return;
210
211 if ((startblock + (size >> log2blksz)) >
212 (part_offset + fs->total_sect)) {
213 printf("part_offset is " LBAFU "\n", part_offset);
214 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
215 printf("error: overflow occurs\n");
216 return;
217 }
218
219 if (remainder) {
220 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
221 temp_ptr = sec_buf;
222 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
223 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
224 } else {
225 if (size >> log2blksz != 0) {
226 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
227 (unsigned long *)buf);
228 } else {
229 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
230 temp_ptr = sec_buf;
231 memcpy(temp_ptr, buf, size);
232 blk_dwrite(fs->dev_desc, startblock, 1,
233 (unsigned long *)sec_buf);
234 }
235 }
236 }
237
238 static int _get_new_inode_no(unsigned char *buffer)
239 {
240 struct ext_filesystem *fs = get_fs();
241 unsigned char input;
242 int operand, status;
243 int count = 1;
244 int j = 0;
245
246 /* get the blocksize of the filesystem */
247 unsigned char *ptr = buffer;
248 while (*ptr == 255) {
249 ptr++;
250 count += 8;
251 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
252 return -1;
253 }
254
255 for (j = 0; j < fs->blksz; j++) {
256 input = *ptr;
257 int i = 0;
258 while (i <= 7) {
259 operand = 1 << i;
260 status = input & operand;
261 if (status) {
262 i++;
263 count++;
264 } else {
265 *ptr |= operand;
266 return count;
267 }
268 }
269 ptr = ptr + 1;
270 }
271
272 return -1;
273 }
274
275 static int _get_new_blk_no(unsigned char *buffer)
276 {
277 int operand;
278 int count = 0;
279 int i;
280 unsigned char *ptr = buffer;
281 struct ext_filesystem *fs = get_fs();
282
283 while (*ptr == 255) {
284 ptr++;
285 count += 8;
286 if (count == (fs->blksz * 8))
287 return -1;
288 }
289
290 if (fs->blksz == 1024)
291 count += 1;
292
293 for (i = 0; i <= 7; i++) {
294 operand = 1 << i;
295 if (*ptr & operand) {
296 count++;
297 } else {
298 *ptr |= operand;
299 return count;
300 }
301 }
302
303 return -1;
304 }
305
306 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
307 {
308 int i, remainder, status;
309 unsigned char *ptr = buffer;
310 unsigned char operand;
311 i = blockno / 8;
312 remainder = blockno % 8;
313 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
314
315 i = i - (index * blocksize);
316 if (blocksize != 1024) {
317 ptr = ptr + i;
318 operand = 1 << remainder;
319 status = *ptr & operand;
320 if (status)
321 return -1;
322
323 *ptr = *ptr | operand;
324 return 0;
325 } else {
326 if (remainder == 0) {
327 ptr = ptr + i - 1;
328 operand = (1 << 7);
329 } else {
330 ptr = ptr + i;
331 operand = (1 << (remainder - 1));
332 }
333 status = *ptr & operand;
334 if (status)
335 return -1;
336
337 *ptr = *ptr | operand;
338 return 0;
339 }
340 }
341
342 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
343 {
344 int i, remainder, status;
345 unsigned char *ptr = buffer;
346 unsigned char operand;
347 i = blockno / 8;
348 remainder = blockno % 8;
349 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
350
351 i = i - (index * blocksize);
352 if (blocksize != 1024) {
353 ptr = ptr + i;
354 operand = (1 << remainder);
355 status = *ptr & operand;
356 if (status)
357 *ptr = *ptr & ~(operand);
358 } else {
359 if (remainder == 0) {
360 ptr = ptr + i - 1;
361 operand = (1 << 7);
362 } else {
363 ptr = ptr + i;
364 operand = (1 << (remainder - 1));
365 }
366 status = *ptr & operand;
367 if (status)
368 *ptr = *ptr & ~(operand);
369 }
370 }
371
372 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
373 {
374 int i, remainder, status;
375 unsigned char *ptr = buffer;
376 unsigned char operand;
377
378 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
379 i = inode_no / 8;
380 remainder = inode_no % 8;
381 if (remainder == 0) {
382 ptr = ptr + i - 1;
383 operand = (1 << 7);
384 } else {
385 ptr = ptr + i;
386 operand = (1 << (remainder - 1));
387 }
388 status = *ptr & operand;
389 if (status)
390 return -1;
391
392 *ptr = *ptr | operand;
393
394 return 0;
395 }
396
397 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
398 {
399 int i, remainder, status;
400 unsigned char *ptr = buffer;
401 unsigned char operand;
402
403 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
404 i = inode_no / 8;
405 remainder = inode_no % 8;
406 if (remainder == 0) {
407 ptr = ptr + i - 1;
408 operand = (1 << 7);
409 } else {
410 ptr = ptr + i;
411 operand = (1 << (remainder - 1));
412 }
413 status = *ptr & operand;
414 if (status)
415 *ptr = *ptr & ~(operand);
416 }
417
418 uint16_t ext4fs_checksum_update(uint32_t i)
419 {
420 struct ext2_block_group *desc;
421 struct ext_filesystem *fs = get_fs();
422 uint16_t crc = 0;
423 __le32 le32_i = cpu_to_le32(i);
424
425 desc = ext4fs_get_group_descriptor(fs, i);
426 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
427 int offset = offsetof(struct ext2_block_group, bg_checksum);
428
429 crc = ext2fs_crc16(~0, fs->sb->unique_id,
430 sizeof(fs->sb->unique_id));
431 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
432 crc = ext2fs_crc16(crc, desc, offset);
433 offset += sizeof(desc->bg_checksum); /* skip checksum */
434 assert(offset == sizeof(*desc));
435 }
436
437 return crc;
438 }
439
440 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
441 {
442 int dentry_length;
443 int sizeof_void_space;
444 int new_entry_byte_reqd;
445 short padding_factor = 0;
446
447 if (dir->namelen % 4 != 0)
448 padding_factor = 4 - (dir->namelen % 4);
449
450 dentry_length = sizeof(struct ext2_dirent) +
451 dir->namelen + padding_factor;
452 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
453 if (sizeof_void_space == 0)
454 return 0;
455
456 padding_factor = 0;
457 if (strlen(filename) % 4 != 0)
458 padding_factor = 4 - (strlen(filename) % 4);
459
460 new_entry_byte_reqd = strlen(filename) +
461 sizeof(struct ext2_dirent) + padding_factor;
462 if (sizeof_void_space >= new_entry_byte_reqd) {
463 dir->direntlen = cpu_to_le16(dentry_length);
464 return sizeof_void_space;
465 }
466
467 return 0;
468 }
469
470 int ext4fs_update_parent_dentry(char *filename, int file_type)
471 {
472 unsigned int *zero_buffer = NULL;
473 char *root_first_block_buffer = NULL;
474 int blk_idx;
475 long int first_block_no_of_root = 0;
476 int totalbytes = 0;
477 unsigned int new_entry_byte_reqd;
478 int sizeof_void_space = 0;
479 int templength = 0;
480 int inodeno = -1;
481 int status;
482 struct ext_filesystem *fs = get_fs();
483 /* directory entry */
484 struct ext2_dirent *dir;
485 char *temp_dir = NULL;
486 uint32_t new_blk_no;
487 uint32_t new_size;
488 uint32_t new_blockcnt;
489 uint32_t directory_blocks;
490
491 zero_buffer = zalloc(fs->blksz);
492 if (!zero_buffer) {
493 printf("No Memory\n");
494 return -1;
495 }
496 root_first_block_buffer = zalloc(fs->blksz);
497 if (!root_first_block_buffer) {
498 free(zero_buffer);
499 printf("No Memory\n");
500 return -1;
501 }
502 new_entry_byte_reqd = ROUND(strlen(filename) +
503 sizeof(struct ext2_dirent), 4);
504 restart:
505 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
506 LOG2_BLOCK_SIZE(ext4fs_root);
507 blk_idx = directory_blocks - 1;
508
509 restart_read:
510 /* read the block no allocated to a file */
511 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx);
512 if (first_block_no_of_root <= 0)
513 goto fail;
514
515 status = ext4fs_devread((lbaint_t)first_block_no_of_root
516 * fs->sect_perblk,
517 0, fs->blksz, root_first_block_buffer);
518 if (status == 0)
519 goto fail;
520
521 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
522 goto fail;
523 dir = (struct ext2_dirent *)root_first_block_buffer;
524 totalbytes = 0;
525
526 while (le16_to_cpu(dir->direntlen) > 0) {
527 unsigned short used_len = ROUND(dir->namelen +
528 sizeof(struct ext2_dirent), 4);
529
530 /* last entry of block */
531 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
532
533 /* check if new entry fits */
534 if ((used_len + new_entry_byte_reqd) <=
535 le16_to_cpu(dir->direntlen)) {
536 dir->direntlen = cpu_to_le16(used_len);
537 break;
538 } else {
539 if (blk_idx > 0) {
540 printf("Block full, trying previous\n");
541 blk_idx--;
542 goto restart_read;
543 }
544 printf("All blocks full: Allocate new\n");
545
546 if (le32_to_cpu(g_parent_inode->flags) &
547 EXT4_EXTENTS_FL) {
548 printf("Directory uses extents\n");
549 goto fail;
550 }
551 if (directory_blocks >= INDIRECT_BLOCKS) {
552 printf("Directory exceeds limit\n");
553 goto fail;
554 }
555 new_blk_no = ext4fs_get_new_blk_no();
556 if (new_blk_no == -1) {
557 printf("no block left to assign\n");
558 goto fail;
559 }
560 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
561 g_parent_inode->b.blocks.
562 dir_blocks[directory_blocks] =
563 cpu_to_le32(new_blk_no);
564
565 new_size = le32_to_cpu(g_parent_inode->size);
566 new_size += fs->blksz;
567 g_parent_inode->size = cpu_to_le32(new_size);
568
569 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
570 new_blockcnt += fs->sect_perblk;
571 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
572
573 if (ext4fs_put_metadata
574 (root_first_block_buffer,
575 first_block_no_of_root))
576 goto fail;
577 goto restart;
578 }
579 }
580
581 templength = le16_to_cpu(dir->direntlen);
582 totalbytes = totalbytes + templength;
583 sizeof_void_space = check_void_in_dentry(dir, filename);
584 if (sizeof_void_space)
585 break;
586
587 dir = (struct ext2_dirent *)((char *)dir + templength);
588 }
589
590 /* make a pointer ready for creating next directory entry */
591 templength = le16_to_cpu(dir->direntlen);
592 totalbytes = totalbytes + templength;
593 dir = (struct ext2_dirent *)((char *)dir + templength);
594
595 /* get the next available inode number */
596 inodeno = ext4fs_get_new_inode_no();
597 if (inodeno == -1) {
598 printf("no inode left to assign\n");
599 goto fail;
600 }
601 dir->inode = cpu_to_le32(inodeno);
602 if (sizeof_void_space)
603 dir->direntlen = cpu_to_le16(sizeof_void_space);
604 else
605 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
606
607 dir->namelen = strlen(filename);
608 dir->filetype = FILETYPE_REG; /* regular file */
609 temp_dir = (char *)dir;
610 temp_dir = temp_dir + sizeof(struct ext2_dirent);
611 memcpy(temp_dir, filename, strlen(filename));
612
613 /* update or write the 1st block of root inode */
614 if (ext4fs_put_metadata(root_first_block_buffer,
615 first_block_no_of_root))
616 goto fail;
617
618 fail:
619 free(zero_buffer);
620 free(root_first_block_buffer);
621
622 return inodeno;
623 }
624
625 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
626 {
627 int status;
628 int inodeno = 0;
629 int offset;
630 int blk_idx;
631 long int blknr;
632 char *block_buffer = NULL;
633 struct ext2_dirent *dir = NULL;
634 struct ext_filesystem *fs = get_fs();
635 uint32_t directory_blocks;
636 char *direntname;
637
638 directory_blocks = le32_to_cpu(parent_inode->size) >>
639 LOG2_BLOCK_SIZE(ext4fs_root);
640
641 block_buffer = zalloc(fs->blksz);
642 if (!block_buffer)
643 goto fail;
644
645 /* get the block no allocated to a file */
646 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
647 blknr = read_allocated_block(parent_inode, blk_idx);
648 if (blknr <= 0)
649 goto fail;
650
651 /* read the directory block */
652 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
653 0, fs->blksz, (char *)block_buffer);
654 if (status == 0)
655 goto fail;
656
657 offset = 0;
658 do {
659 dir = (struct ext2_dirent *)(block_buffer + offset);
660 direntname = (char*)(dir) + sizeof(struct ext2_dirent);
661
662 int direntlen = le16_to_cpu(dir->direntlen);
663 if (direntlen < sizeof(struct ext2_dirent))
664 break;
665
666 if (dir->inode && (strlen(dirname) == dir->namelen) &&
667 (strncmp(dirname, direntname, dir->namelen) == 0)) {
668 inodeno = le32_to_cpu(dir->inode);
669 break;
670 }
671
672 offset += direntlen;
673
674 } while (offset < fs->blksz);
675
676 if (inodeno > 0) {
677 free(block_buffer);
678 return inodeno;
679 }
680 }
681
682 fail:
683 free(block_buffer);
684
685 return -1;
686 }
687
688 static int find_dir_depth(char *dirname)
689 {
690 char *token = strtok(dirname, "/");
691 int count = 0;
692 while (token != NULL) {
693 token = strtok(NULL, "/");
694 count++;
695 }
696 return count + 1 + 1;
697 /*
698 * for example for string /home/temp
699 * depth=home(1)+temp(1)+1 extra for NULL;
700 * so count is 4;
701 */
702 }
703
704 static int parse_path(char **arr, char *dirname)
705 {
706 char *token = strtok(dirname, "/");
707 int i = 0;
708
709 /* add root */
710 arr[i] = zalloc(strlen("/") + 1);
711 if (!arr[i])
712 return -ENOMEM;
713 memcpy(arr[i++], "/", strlen("/"));
714
715 /* add each path entry after root */
716 while (token != NULL) {
717 arr[i] = zalloc(strlen(token) + 1);
718 if (!arr[i])
719 return -ENOMEM;
720 memcpy(arr[i++], token, strlen(token));
721 token = strtok(NULL, "/");
722 }
723 arr[i] = NULL;
724
725 return 0;
726 }
727
728 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
729 {
730 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
731 return -1;
732
733 return 0;
734 }
735
736 /*
737 * Function: ext4fs_get_parent_inode_num
738 * Return Value: inode Number of the parent directory of file/Directory to be
739 * created
740 * dirname : Input parmater, input path name of the file/directory to be created
741 * dname : Output parameter, to be filled with the name of the directory
742 * extracted from dirname
743 */
744 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
745 {
746 int i;
747 int depth = 0;
748 int matched_inode_no;
749 int result_inode_no = -1;
750 char **ptr = NULL;
751 char *depth_dirname = NULL;
752 char *parse_dirname = NULL;
753 struct ext2_inode *parent_inode = NULL;
754 struct ext2_inode *first_inode = NULL;
755 struct ext2_inode temp_inode;
756
757 if (*dirname != '/') {
758 printf("Please supply Absolute path\n");
759 return -1;
760 }
761
762 /* TODO: input validation make equivalent to linux */
763 depth_dirname = zalloc(strlen(dirname) + 1);
764 if (!depth_dirname)
765 return -ENOMEM;
766
767 memcpy(depth_dirname, dirname, strlen(dirname));
768 depth = find_dir_depth(depth_dirname);
769 parse_dirname = zalloc(strlen(dirname) + 1);
770 if (!parse_dirname)
771 goto fail;
772 memcpy(parse_dirname, dirname, strlen(dirname));
773
774 /* allocate memory for each directory level */
775 ptr = zalloc((depth) * sizeof(char *));
776 if (!ptr)
777 goto fail;
778 if (parse_path(ptr, parse_dirname))
779 goto fail;
780 parent_inode = zalloc(sizeof(struct ext2_inode));
781 if (!parent_inode)
782 goto fail;
783 first_inode = zalloc(sizeof(struct ext2_inode));
784 if (!first_inode)
785 goto fail;
786 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
787 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
788 if (flags & F_FILE)
789 result_inode_no = EXT2_ROOT_INO;
790 for (i = 1; i < depth; i++) {
791 matched_inode_no = search_dir(parent_inode, ptr[i]);
792 if (matched_inode_no == -1) {
793 if (ptr[i + 1] == NULL && i == 1) {
794 result_inode_no = EXT2_ROOT_INO;
795 goto end;
796 } else {
797 if (ptr[i + 1] == NULL)
798 break;
799 printf("Invalid path\n");
800 result_inode_no = -1;
801 goto fail;
802 }
803 } else {
804 if (ptr[i + 1] != NULL) {
805 memset(parent_inode, '\0',
806 sizeof(struct ext2_inode));
807 if (ext4fs_iget(matched_inode_no,
808 parent_inode)) {
809 result_inode_no = -1;
810 goto fail;
811 }
812 result_inode_no = matched_inode_no;
813 } else {
814 break;
815 }
816 }
817 }
818
819 end:
820 if (i == 1)
821 matched_inode_no = search_dir(first_inode, ptr[i]);
822 else
823 matched_inode_no = search_dir(parent_inode, ptr[i]);
824
825 if (matched_inode_no != -1) {
826 ext4fs_iget(matched_inode_no, &temp_inode);
827 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
828 printf("It is a Directory\n");
829 result_inode_no = -1;
830 goto fail;
831 }
832 }
833
834 if (strlen(ptr[i]) > 256) {
835 result_inode_no = -1;
836 goto fail;
837 }
838 memcpy(dname, ptr[i], strlen(ptr[i]));
839
840 fail:
841 free(depth_dirname);
842 free(parse_dirname);
843 for (i = 0; i < depth; i++) {
844 if (!ptr[i])
845 break;
846 free(ptr[i]);
847 }
848 free(ptr);
849 free(parent_inode);
850 free(first_inode);
851
852 return result_inode_no;
853 }
854
855 static int unlink_filename(char *filename, unsigned int blknr)
856 {
857 int status;
858 int inodeno = 0;
859 int offset;
860 char *block_buffer = NULL;
861 struct ext2_dirent *dir = NULL;
862 struct ext2_dirent *previous_dir;
863 struct ext_filesystem *fs = get_fs();
864 int ret = -1;
865 char *direntname;
866
867 block_buffer = zalloc(fs->blksz);
868 if (!block_buffer)
869 return -ENOMEM;
870
871 /* read the directory block */
872 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
873 fs->blksz, block_buffer);
874 if (status == 0)
875 goto fail;
876
877 offset = 0;
878 do {
879 previous_dir = dir;
880 dir = (struct ext2_dirent *)(block_buffer + offset);
881 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
882
883 int direntlen = le16_to_cpu(dir->direntlen);
884 if (direntlen < sizeof(struct ext2_dirent))
885 break;
886
887 if (dir->inode && (strlen(filename) == dir->namelen) &&
888 (strncmp(direntname, filename, dir->namelen) == 0)) {
889 inodeno = le32_to_cpu(dir->inode);
890 break;
891 }
892
893 offset += direntlen;
894
895 } while (offset < fs->blksz);
896
897 if (inodeno > 0) {
898 printf("file found, deleting\n");
899 if (ext4fs_log_journal(block_buffer, blknr))
900 goto fail;
901
902 if (previous_dir) {
903 /* merge dir entry with predecessor */
904 uint16_t new_len;
905 new_len = le16_to_cpu(previous_dir->direntlen);
906 new_len += le16_to_cpu(dir->direntlen);
907 previous_dir->direntlen = cpu_to_le16(new_len);
908 } else {
909 /* invalidate dir entry */
910 dir->inode = 0;
911 }
912 if (ext4fs_put_metadata(block_buffer, blknr))
913 goto fail;
914 ret = inodeno;
915 }
916 fail:
917 free(block_buffer);
918
919 return ret;
920 }
921
922 int ext4fs_filename_unlink(char *filename)
923 {
924 int blk_idx;
925 long int blknr = -1;
926 int inodeno = -1;
927 uint32_t directory_blocks;
928
929 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
930 LOG2_BLOCK_SIZE(ext4fs_root);
931
932 /* read the block no allocated to a file */
933 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
934 blknr = read_allocated_block(g_parent_inode, blk_idx);
935 if (blknr <= 0)
936 break;
937 inodeno = unlink_filename(filename, blknr);
938 if (inodeno != -1)
939 return inodeno;
940 }
941
942 return -1;
943 }
944
945 uint32_t ext4fs_get_new_blk_no(void)
946 {
947 short i;
948 short status;
949 int remainder;
950 unsigned int bg_idx;
951 static int prev_bg_bitmap_index = -1;
952 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
953 struct ext_filesystem *fs = get_fs();
954 char *journal_buffer = zalloc(fs->blksz);
955 char *zero_buffer = zalloc(fs->blksz);
956 if (!journal_buffer || !zero_buffer)
957 goto fail;
958
959 if (fs->first_pass_bbmap == 0) {
960 for (i = 0; i < fs->no_blkgrp; i++) {
961 struct ext2_block_group *bgd = NULL;
962 bgd = ext4fs_get_group_descriptor(fs, i);
963 if (ext4fs_bg_get_free_blocks(bgd, fs)) {
964 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
965 uint64_t b_bitmap_blk =
966 ext4fs_bg_get_block_id(bgd, fs);
967 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
968 memcpy(fs->blk_bmaps[i], zero_buffer,
969 fs->blksz);
970 put_ext4(b_bitmap_blk * fs->blksz,
971 fs->blk_bmaps[i], fs->blksz);
972 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
973 ext4fs_bg_set_flags(bgd, bg_flags);
974 }
975 fs->curr_blkno =
976 _get_new_blk_no(fs->blk_bmaps[i]);
977 if (fs->curr_blkno == -1)
978 /* block bitmap is completely filled */
979 continue;
980 fs->curr_blkno = fs->curr_blkno +
981 (i * fs->blksz * 8);
982 fs->first_pass_bbmap++;
983 ext4fs_bg_free_blocks_dec(bgd, fs);
984 ext4fs_sb_free_blocks_dec(fs->sb);
985 status = ext4fs_devread(b_bitmap_blk *
986 fs->sect_perblk,
987 0, fs->blksz,
988 journal_buffer);
989 if (status == 0)
990 goto fail;
991 if (ext4fs_log_journal(journal_buffer,
992 b_bitmap_blk))
993 goto fail;
994 goto success;
995 } else {
996 debug("no space left on block group %d\n", i);
997 }
998 }
999
1000 goto fail;
1001 } else {
1002 fs->curr_blkno++;
1003 restart:
1004 /* get the blockbitmap index respective to blockno */
1005 bg_idx = fs->curr_blkno / blk_per_grp;
1006 if (fs->blksz == 1024) {
1007 remainder = fs->curr_blkno % blk_per_grp;
1008 if (!remainder)
1009 bg_idx--;
1010 }
1011
1012 /*
1013 * To skip completely filled block group bitmaps
1014 * Optimize the block allocation
1015 */
1016 if (bg_idx >= fs->no_blkgrp)
1017 goto fail;
1018
1019 struct ext2_block_group *bgd = NULL;
1020 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1021 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1022 debug("block group %u is full. Skipping\n", bg_idx);
1023 fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1024 if (fs->blksz == 1024)
1025 fs->curr_blkno += 1;
1026 goto restart;
1027 }
1028
1029 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1030 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1031 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1032 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1033 put_ext4(b_bitmap_blk * fs->blksz,
1034 zero_buffer, fs->blksz);
1035 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1036 ext4fs_bg_set_flags(bgd, bg_flags);
1037 }
1038
1039 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1040 bg_idx) != 0) {
1041 debug("going for restart for the block no %ld %u\n",
1042 fs->curr_blkno, bg_idx);
1043 fs->curr_blkno++;
1044 goto restart;
1045 }
1046
1047 /* journal backup */
1048 if (prev_bg_bitmap_index != bg_idx) {
1049 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1050 0, fs->blksz, journal_buffer);
1051 if (status == 0)
1052 goto fail;
1053 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1054 goto fail;
1055
1056 prev_bg_bitmap_index = bg_idx;
1057 }
1058 ext4fs_bg_free_blocks_dec(bgd, fs);
1059 ext4fs_sb_free_blocks_dec(fs->sb);
1060 goto success;
1061 }
1062 success:
1063 free(journal_buffer);
1064 free(zero_buffer);
1065
1066 return fs->curr_blkno;
1067 fail:
1068 free(journal_buffer);
1069 free(zero_buffer);
1070
1071 return -1;
1072 }
1073
1074 int ext4fs_get_new_inode_no(void)
1075 {
1076 short i;
1077 short status;
1078 unsigned int ibmap_idx;
1079 static int prev_inode_bitmap_index = -1;
1080 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1081 struct ext_filesystem *fs = get_fs();
1082 char *journal_buffer = zalloc(fs->blksz);
1083 char *zero_buffer = zalloc(fs->blksz);
1084 if (!journal_buffer || !zero_buffer)
1085 goto fail;
1086 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1087 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1088
1089 if (fs->first_pass_ibmap == 0) {
1090 for (i = 0; i < fs->no_blkgrp; i++) {
1091 uint32_t free_inodes;
1092 struct ext2_block_group *bgd = NULL;
1093 bgd = ext4fs_get_group_descriptor(fs, i);
1094 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1095 if (free_inodes) {
1096 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1097 uint64_t i_bitmap_blk =
1098 ext4fs_bg_get_inode_id(bgd, fs);
1099 if (has_gdt_chksum)
1100 bgd->bg_itable_unused = free_inodes;
1101 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1102 put_ext4(i_bitmap_blk * fs->blksz,
1103 zero_buffer, fs->blksz);
1104 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1105 ext4fs_bg_set_flags(bgd, bg_flags);
1106 memcpy(fs->inode_bmaps[i],
1107 zero_buffer, fs->blksz);
1108 }
1109 fs->curr_inode_no =
1110 _get_new_inode_no(fs->inode_bmaps[i]);
1111 if (fs->curr_inode_no == -1)
1112 /* inode bitmap is completely filled */
1113 continue;
1114 fs->curr_inode_no = fs->curr_inode_no +
1115 (i * inodes_per_grp);
1116 fs->first_pass_ibmap++;
1117 ext4fs_bg_free_inodes_dec(bgd, fs);
1118 if (has_gdt_chksum)
1119 ext4fs_bg_itable_unused_dec(bgd, fs);
1120 ext4fs_sb_free_inodes_dec(fs->sb);
1121 status = ext4fs_devread(i_bitmap_blk *
1122 fs->sect_perblk,
1123 0, fs->blksz,
1124 journal_buffer);
1125 if (status == 0)
1126 goto fail;
1127 if (ext4fs_log_journal(journal_buffer,
1128 i_bitmap_blk))
1129 goto fail;
1130 goto success;
1131 } else
1132 debug("no inode left on block group %d\n", i);
1133 }
1134 goto fail;
1135 } else {
1136 restart:
1137 fs->curr_inode_no++;
1138 /* get the blockbitmap index respective to blockno */
1139 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1140 struct ext2_block_group *bgd =
1141 ext4fs_get_group_descriptor(fs, ibmap_idx);
1142 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1143 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1144
1145 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1146 put_ext4(i_bitmap_blk * fs->blksz,
1147 zero_buffer, fs->blksz);
1148 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1149 ext4fs_bg_set_flags(bgd, bg_flags);
1150 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1151 fs->blksz);
1152 }
1153
1154 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1155 fs->inode_bmaps[ibmap_idx],
1156 ibmap_idx) != 0) {
1157 debug("going for restart for the block no %d %u\n",
1158 fs->curr_inode_no, ibmap_idx);
1159 goto restart;
1160 }
1161
1162 /* journal backup */
1163 if (prev_inode_bitmap_index != ibmap_idx) {
1164 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1165 0, fs->blksz, journal_buffer);
1166 if (status == 0)
1167 goto fail;
1168 if (ext4fs_log_journal(journal_buffer,
1169 le32_to_cpu(bgd->inode_id)))
1170 goto fail;
1171 prev_inode_bitmap_index = ibmap_idx;
1172 }
1173 ext4fs_bg_free_inodes_dec(bgd, fs);
1174 if (has_gdt_chksum)
1175 bgd->bg_itable_unused = bgd->free_inodes;
1176 ext4fs_sb_free_inodes_dec(fs->sb);
1177 goto success;
1178 }
1179
1180 success:
1181 free(journal_buffer);
1182 free(zero_buffer);
1183
1184 return fs->curr_inode_no;
1185 fail:
1186 free(journal_buffer);
1187 free(zero_buffer);
1188
1189 return -1;
1190
1191 }
1192
1193
1194 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1195 unsigned int *total_remaining_blocks,
1196 unsigned int *no_blks_reqd)
1197 {
1198 short i;
1199 short status;
1200 long int actual_block_no;
1201 long int si_blockno;
1202 /* si :single indirect */
1203 __le32 *si_buffer = NULL;
1204 __le32 *si_start_addr = NULL;
1205 struct ext_filesystem *fs = get_fs();
1206
1207 if (*total_remaining_blocks != 0) {
1208 si_buffer = zalloc(fs->blksz);
1209 if (!si_buffer) {
1210 printf("No Memory\n");
1211 return;
1212 }
1213 si_start_addr = si_buffer;
1214 si_blockno = ext4fs_get_new_blk_no();
1215 if (si_blockno == -1) {
1216 printf("no block left to assign\n");
1217 goto fail;
1218 }
1219 (*no_blks_reqd)++;
1220 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1221
1222 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1223 0, fs->blksz, (char *)si_buffer);
1224 memset(si_buffer, '\0', fs->blksz);
1225 if (status == 0)
1226 goto fail;
1227
1228 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1229 actual_block_no = ext4fs_get_new_blk_no();
1230 if (actual_block_no == -1) {
1231 printf("no block left to assign\n");
1232 goto fail;
1233 }
1234 *si_buffer = cpu_to_le32(actual_block_no);
1235 debug("SIAB %u: %u\n", *si_buffer,
1236 *total_remaining_blocks);
1237
1238 si_buffer++;
1239 (*total_remaining_blocks)--;
1240 if (*total_remaining_blocks == 0)
1241 break;
1242 }
1243
1244 /* write the block to disk */
1245 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1246 si_start_addr, fs->blksz);
1247 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1248 }
1249 fail:
1250 free(si_start_addr);
1251 }
1252
1253 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1254 unsigned int *total_remaining_blocks,
1255 unsigned int *no_blks_reqd)
1256 {
1257 short i;
1258 short j;
1259 short status;
1260 long int actual_block_no;
1261 /* di:double indirect */
1262 long int di_blockno_parent;
1263 long int di_blockno_child;
1264 __le32 *di_parent_buffer = NULL;
1265 __le32 *di_child_buff = NULL;
1266 __le32 *di_block_start_addr = NULL;
1267 __le32 *di_child_buff_start = NULL;
1268 struct ext_filesystem *fs = get_fs();
1269
1270 if (*total_remaining_blocks != 0) {
1271 /* double indirect parent block connecting to inode */
1272 di_blockno_parent = ext4fs_get_new_blk_no();
1273 if (di_blockno_parent == -1) {
1274 printf("no block left to assign\n");
1275 goto fail;
1276 }
1277 di_parent_buffer = zalloc(fs->blksz);
1278 if (!di_parent_buffer)
1279 goto fail;
1280
1281 di_block_start_addr = di_parent_buffer;
1282 (*no_blks_reqd)++;
1283 debug("DIPB %ld: %u\n", di_blockno_parent,
1284 *total_remaining_blocks);
1285
1286 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1287 fs->sect_perblk, 0,
1288 fs->blksz, (char *)di_parent_buffer);
1289
1290 if (!status) {
1291 printf("%s: Device read error!\n", __func__);
1292 goto fail;
1293 }
1294 memset(di_parent_buffer, '\0', fs->blksz);
1295
1296 /*
1297 * start:for each double indirect parent
1298 * block create one more block
1299 */
1300 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1301 di_blockno_child = ext4fs_get_new_blk_no();
1302 if (di_blockno_child == -1) {
1303 printf("no block left to assign\n");
1304 goto fail;
1305 }
1306 di_child_buff = zalloc(fs->blksz);
1307 if (!di_child_buff)
1308 goto fail;
1309
1310 di_child_buff_start = di_child_buff;
1311 *di_parent_buffer = cpu_to_le32(di_blockno_child);
1312 di_parent_buffer++;
1313 (*no_blks_reqd)++;
1314 debug("DICB %ld: %u\n", di_blockno_child,
1315 *total_remaining_blocks);
1316
1317 status = ext4fs_devread((lbaint_t)di_blockno_child *
1318 fs->sect_perblk, 0,
1319 fs->blksz,
1320 (char *)di_child_buff);
1321
1322 if (!status) {
1323 printf("%s: Device read error!\n", __func__);
1324 goto fail;
1325 }
1326 memset(di_child_buff, '\0', fs->blksz);
1327 /* filling of actual datablocks for each child */
1328 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1329 actual_block_no = ext4fs_get_new_blk_no();
1330 if (actual_block_no == -1) {
1331 printf("no block left to assign\n");
1332 goto fail;
1333 }
1334 *di_child_buff = cpu_to_le32(actual_block_no);
1335 debug("DIAB %ld: %u\n", actual_block_no,
1336 *total_remaining_blocks);
1337
1338 di_child_buff++;
1339 (*total_remaining_blocks)--;
1340 if (*total_remaining_blocks == 0)
1341 break;
1342 }
1343 /* write the block table */
1344 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1345 di_child_buff_start, fs->blksz);
1346 free(di_child_buff_start);
1347 di_child_buff_start = NULL;
1348
1349 if (*total_remaining_blocks == 0)
1350 break;
1351 }
1352 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1353 di_block_start_addr, fs->blksz);
1354 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1355 }
1356 fail:
1357 free(di_block_start_addr);
1358 }
1359
1360 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1361 unsigned int *total_remaining_blocks,
1362 unsigned int *no_blks_reqd)
1363 {
1364 short i;
1365 short j;
1366 short k;
1367 long int actual_block_no;
1368 /* ti: Triple Indirect */
1369 long int ti_gp_blockno;
1370 long int ti_parent_blockno;
1371 long int ti_child_blockno;
1372 __le32 *ti_gp_buff = NULL;
1373 __le32 *ti_parent_buff = NULL;
1374 __le32 *ti_child_buff = NULL;
1375 __le32 *ti_gp_buff_start_addr = NULL;
1376 __le32 *ti_pbuff_start_addr = NULL;
1377 __le32 *ti_cbuff_start_addr = NULL;
1378 struct ext_filesystem *fs = get_fs();
1379 if (*total_remaining_blocks != 0) {
1380 /* triple indirect grand parent block connecting to inode */
1381 ti_gp_blockno = ext4fs_get_new_blk_no();
1382 if (ti_gp_blockno == -1) {
1383 printf("no block left to assign\n");
1384 return;
1385 }
1386 ti_gp_buff = zalloc(fs->blksz);
1387 if (!ti_gp_buff)
1388 return;
1389
1390 ti_gp_buff_start_addr = ti_gp_buff;
1391 (*no_blks_reqd)++;
1392 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1393 *total_remaining_blocks);
1394
1395 /* for each 4 byte grand parent entry create one more block */
1396 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1397 ti_parent_blockno = ext4fs_get_new_blk_no();
1398 if (ti_parent_blockno == -1) {
1399 printf("no block left to assign\n");
1400 goto fail;
1401 }
1402 ti_parent_buff = zalloc(fs->blksz);
1403 if (!ti_parent_buff)
1404 goto fail;
1405
1406 ti_pbuff_start_addr = ti_parent_buff;
1407 *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1408 ti_gp_buff++;
1409 (*no_blks_reqd)++;
1410 debug("TIPB %ld: %u\n", ti_parent_blockno,
1411 *total_remaining_blocks);
1412
1413 /* for each 4 byte entry parent create one more block */
1414 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1415 ti_child_blockno = ext4fs_get_new_blk_no();
1416 if (ti_child_blockno == -1) {
1417 printf("no block left assign\n");
1418 goto fail1;
1419 }
1420 ti_child_buff = zalloc(fs->blksz);
1421 if (!ti_child_buff)
1422 goto fail1;
1423
1424 ti_cbuff_start_addr = ti_child_buff;
1425 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1426 ti_parent_buff++;
1427 (*no_blks_reqd)++;
1428 debug("TICB %ld: %u\n", ti_parent_blockno,
1429 *total_remaining_blocks);
1430
1431 /* fill actual datablocks for each child */
1432 for (k = 0; k < (fs->blksz / sizeof(int));
1433 k++) {
1434 actual_block_no =
1435 ext4fs_get_new_blk_no();
1436 if (actual_block_no == -1) {
1437 printf("no block left\n");
1438 free(ti_cbuff_start_addr);
1439 goto fail1;
1440 }
1441 *ti_child_buff = cpu_to_le32(actual_block_no);
1442 debug("TIAB %ld: %u\n", actual_block_no,
1443 *total_remaining_blocks);
1444
1445 ti_child_buff++;
1446 (*total_remaining_blocks)--;
1447 if (*total_remaining_blocks == 0)
1448 break;
1449 }
1450 /* write the child block */
1451 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1452 (uint64_t)fs->blksz)),
1453 ti_cbuff_start_addr, fs->blksz);
1454 free(ti_cbuff_start_addr);
1455
1456 if (*total_remaining_blocks == 0)
1457 break;
1458 }
1459 /* write the parent block */
1460 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1461 ti_pbuff_start_addr, fs->blksz);
1462 free(ti_pbuff_start_addr);
1463
1464 if (*total_remaining_blocks == 0)
1465 break;
1466 }
1467 /* write the grand parent block */
1468 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1469 ti_gp_buff_start_addr, fs->blksz);
1470 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1471 free(ti_gp_buff_start_addr);
1472 return;
1473 }
1474 fail1:
1475 free(ti_pbuff_start_addr);
1476 fail:
1477 free(ti_gp_buff_start_addr);
1478 }
1479
1480 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1481 unsigned int total_remaining_blocks,
1482 unsigned int *total_no_of_block)
1483 {
1484 short i;
1485 long int direct_blockno;
1486 unsigned int no_blks_reqd = 0;
1487
1488 /* allocation of direct blocks */
1489 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1490 direct_blockno = ext4fs_get_new_blk_no();
1491 if (direct_blockno == -1) {
1492 printf("no block left to assign\n");
1493 return;
1494 }
1495 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1496 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1497
1498 total_remaining_blocks--;
1499 }
1500
1501 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1502 &no_blks_reqd);
1503 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1504 &no_blks_reqd);
1505 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1506 &no_blks_reqd);
1507 *total_no_of_block += no_blks_reqd;
1508 }
1509
1510 #endif
1511
1512 static struct ext4_extent_header *ext4fs_get_extent_block
1513 (struct ext2_data *data, char *buf,
1514 struct ext4_extent_header *ext_block,
1515 uint32_t fileblock, int log2_blksz)
1516 {
1517 struct ext4_extent_idx *index;
1518 unsigned long long block;
1519 int blksz = EXT2_BLOCK_SIZE(data);
1520 int i;
1521
1522 while (1) {
1523 index = (struct ext4_extent_idx *)(ext_block + 1);
1524
1525 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1526 return NULL;
1527
1528 if (ext_block->eh_depth == 0)
1529 return ext_block;
1530 i = -1;
1531 do {
1532 i++;
1533 if (i >= le16_to_cpu(ext_block->eh_entries))
1534 break;
1535 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1536
1537 if (--i < 0)
1538 return NULL;
1539
1540 block = le16_to_cpu(index[i].ei_leaf_hi);
1541 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1542
1543 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1544 buf))
1545 ext_block = (struct ext4_extent_header *)buf;
1546 else
1547 return NULL;
1548 }
1549 }
1550
1551 static int ext4fs_blockgroup
1552 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1553 {
1554 long int blkno;
1555 unsigned int blkoff, desc_per_blk;
1556 int log2blksz = get_fs()->dev_desc->log2blksz;
1557 int desc_size = get_fs()->gdsize;
1558
1559 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1560
1561 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1562 group / desc_per_blk;
1563 blkoff = (group % desc_per_blk) * desc_size;
1564
1565 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1566 group, blkno, blkoff);
1567
1568 return ext4fs_devread((lbaint_t)blkno <<
1569 (LOG2_BLOCK_SIZE(data) - log2blksz),
1570 blkoff, desc_size, (char *)blkgrp);
1571 }
1572
1573 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1574 {
1575 struct ext2_block_group blkgrp;
1576 struct ext2_sblock *sblock = &data->sblock;
1577 struct ext_filesystem *fs = get_fs();
1578 int log2blksz = get_fs()->dev_desc->log2blksz;
1579 int inodes_per_block, status;
1580 long int blkno;
1581 unsigned int blkoff;
1582
1583 /* It is easier to calculate if the first inode is 0. */
1584 ino--;
1585 status = ext4fs_blockgroup(data, ino / le32_to_cpu
1586 (sblock->inodes_per_group), &blkgrp);
1587 if (status == 0)
1588 return 0;
1589
1590 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1591 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
1592 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1593 blkoff = (ino % inodes_per_block) * fs->inodesz;
1594 /* Read the inode. */
1595 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1596 log2blksz), blkoff,
1597 sizeof(struct ext2_inode), (char *)inode);
1598 if (status == 0)
1599 return 0;
1600
1601 return 1;
1602 }
1603
1604 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1605 {
1606 long int blknr;
1607 int blksz;
1608 int log2_blksz;
1609 int status;
1610 long int rblock;
1611 long int perblock_parent;
1612 long int perblock_child;
1613 unsigned long long start;
1614 /* get the blocksize of the filesystem */
1615 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1616 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1617 - get_fs()->dev_desc->log2blksz;
1618
1619 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1620 long int startblock, endblock;
1621 char *buf = zalloc(blksz);
1622 if (!buf)
1623 return -ENOMEM;
1624 struct ext4_extent_header *ext_block;
1625 struct ext4_extent *extent;
1626 int i;
1627 ext_block =
1628 ext4fs_get_extent_block(ext4fs_root, buf,
1629 (struct ext4_extent_header *)
1630 inode->b.blocks.dir_blocks,
1631 fileblock, log2_blksz);
1632 if (!ext_block) {
1633 printf("invalid extent block\n");
1634 free(buf);
1635 return -EINVAL;
1636 }
1637
1638 extent = (struct ext4_extent *)(ext_block + 1);
1639
1640 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1641 startblock = le32_to_cpu(extent[i].ee_block);
1642 endblock = startblock + le16_to_cpu(extent[i].ee_len);
1643
1644 if (startblock > fileblock) {
1645 /* Sparse file */
1646 free(buf);
1647 return 0;
1648
1649 } else if (fileblock < endblock) {
1650 start = le16_to_cpu(extent[i].ee_start_hi);
1651 start = (start << 32) +
1652 le32_to_cpu(extent[i].ee_start_lo);
1653 free(buf);
1654 return (fileblock - startblock) + start;
1655 }
1656 }
1657
1658 free(buf);
1659 return 0;
1660 }
1661
1662 /* Direct blocks. */
1663 if (fileblock < INDIRECT_BLOCKS)
1664 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1665
1666 /* Indirect. */
1667 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1668 if (ext4fs_indir1_block == NULL) {
1669 ext4fs_indir1_block = zalloc(blksz);
1670 if (ext4fs_indir1_block == NULL) {
1671 printf("** SI ext2fs read block (indir 1)"
1672 "malloc failed. **\n");
1673 return -1;
1674 }
1675 ext4fs_indir1_size = blksz;
1676 ext4fs_indir1_blkno = -1;
1677 }
1678 if (blksz != ext4fs_indir1_size) {
1679 free(ext4fs_indir1_block);
1680 ext4fs_indir1_block = NULL;
1681 ext4fs_indir1_size = 0;
1682 ext4fs_indir1_blkno = -1;
1683 ext4fs_indir1_block = zalloc(blksz);
1684 if (ext4fs_indir1_block == NULL) {
1685 printf("** SI ext2fs read block (indir 1):"
1686 "malloc failed. **\n");
1687 return -1;
1688 }
1689 ext4fs_indir1_size = blksz;
1690 }
1691 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1692 log2_blksz) != ext4fs_indir1_blkno) {
1693 status =
1694 ext4fs_devread((lbaint_t)le32_to_cpu
1695 (inode->b.blocks.
1696 indir_block) << log2_blksz, 0,
1697 blksz, (char *)ext4fs_indir1_block);
1698 if (status == 0) {
1699 printf("** SI ext2fs read block (indir 1)"
1700 "failed. **\n");
1701 return -1;
1702 }
1703 ext4fs_indir1_blkno =
1704 le32_to_cpu(inode->b.blocks.
1705 indir_block) << log2_blksz;
1706 }
1707 blknr = le32_to_cpu(ext4fs_indir1_block
1708 [fileblock - INDIRECT_BLOCKS]);
1709 }
1710 /* Double indirect. */
1711 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1712 (blksz / 4 + 1)))) {
1713
1714 long int perblock = blksz / 4;
1715 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1716
1717 if (ext4fs_indir1_block == NULL) {
1718 ext4fs_indir1_block = zalloc(blksz);
1719 if (ext4fs_indir1_block == NULL) {
1720 printf("** DI ext2fs read block (indir 2 1)"
1721 "malloc failed. **\n");
1722 return -1;
1723 }
1724 ext4fs_indir1_size = blksz;
1725 ext4fs_indir1_blkno = -1;
1726 }
1727 if (blksz != ext4fs_indir1_size) {
1728 free(ext4fs_indir1_block);
1729 ext4fs_indir1_block = NULL;
1730 ext4fs_indir1_size = 0;
1731 ext4fs_indir1_blkno = -1;
1732 ext4fs_indir1_block = zalloc(blksz);
1733 if (ext4fs_indir1_block == NULL) {
1734 printf("** DI ext2fs read block (indir 2 1)"
1735 "malloc failed. **\n");
1736 return -1;
1737 }
1738 ext4fs_indir1_size = blksz;
1739 }
1740 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1741 log2_blksz) != ext4fs_indir1_blkno) {
1742 status =
1743 ext4fs_devread((lbaint_t)le32_to_cpu
1744 (inode->b.blocks.
1745 double_indir_block) << log2_blksz,
1746 0, blksz,
1747 (char *)ext4fs_indir1_block);
1748 if (status == 0) {
1749 printf("** DI ext2fs read block (indir 2 1)"
1750 "failed. **\n");
1751 return -1;
1752 }
1753 ext4fs_indir1_blkno =
1754 le32_to_cpu(inode->b.blocks.double_indir_block) <<
1755 log2_blksz;
1756 }
1757
1758 if (ext4fs_indir2_block == NULL) {
1759 ext4fs_indir2_block = zalloc(blksz);
1760 if (ext4fs_indir2_block == NULL) {
1761 printf("** DI ext2fs read block (indir 2 2)"
1762 "malloc failed. **\n");
1763 return -1;
1764 }
1765 ext4fs_indir2_size = blksz;
1766 ext4fs_indir2_blkno = -1;
1767 }
1768 if (blksz != ext4fs_indir2_size) {
1769 free(ext4fs_indir2_block);
1770 ext4fs_indir2_block = NULL;
1771 ext4fs_indir2_size = 0;
1772 ext4fs_indir2_blkno = -1;
1773 ext4fs_indir2_block = zalloc(blksz);
1774 if (ext4fs_indir2_block == NULL) {
1775 printf("** DI ext2fs read block (indir 2 2)"
1776 "malloc failed. **\n");
1777 return -1;
1778 }
1779 ext4fs_indir2_size = blksz;
1780 }
1781 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1782 log2_blksz) != ext4fs_indir2_blkno) {
1783 status = ext4fs_devread((lbaint_t)le32_to_cpu
1784 (ext4fs_indir1_block
1785 [rblock /
1786 perblock]) << log2_blksz, 0,
1787 blksz,
1788 (char *)ext4fs_indir2_block);
1789 if (status == 0) {
1790 printf("** DI ext2fs read block (indir 2 2)"
1791 "failed. **\n");
1792 return -1;
1793 }
1794 ext4fs_indir2_blkno =
1795 le32_to_cpu(ext4fs_indir1_block[rblock
1796 /
1797 perblock]) <<
1798 log2_blksz;
1799 }
1800 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1801 }
1802 /* Tripple indirect. */
1803 else {
1804 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1805 (blksz / 4 * blksz / 4));
1806 perblock_child = blksz / 4;
1807 perblock_parent = ((blksz / 4) * (blksz / 4));
1808
1809 if (ext4fs_indir1_block == NULL) {
1810 ext4fs_indir1_block = zalloc(blksz);
1811 if (ext4fs_indir1_block == NULL) {
1812 printf("** TI ext2fs read block (indir 2 1)"
1813 "malloc failed. **\n");
1814 return -1;
1815 }
1816 ext4fs_indir1_size = blksz;
1817 ext4fs_indir1_blkno = -1;
1818 }
1819 if (blksz != ext4fs_indir1_size) {
1820 free(ext4fs_indir1_block);
1821 ext4fs_indir1_block = NULL;
1822 ext4fs_indir1_size = 0;
1823 ext4fs_indir1_blkno = -1;
1824 ext4fs_indir1_block = zalloc(blksz);
1825 if (ext4fs_indir1_block == NULL) {
1826 printf("** TI ext2fs read block (indir 2 1)"
1827 "malloc failed. **\n");
1828 return -1;
1829 }
1830 ext4fs_indir1_size = blksz;
1831 }
1832 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1833 log2_blksz) != ext4fs_indir1_blkno) {
1834 status = ext4fs_devread
1835 ((lbaint_t)
1836 le32_to_cpu(inode->b.blocks.triple_indir_block)
1837 << log2_blksz, 0, blksz,
1838 (char *)ext4fs_indir1_block);
1839 if (status == 0) {
1840 printf("** TI ext2fs read block (indir 2 1)"
1841 "failed. **\n");
1842 return -1;
1843 }
1844 ext4fs_indir1_blkno =
1845 le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1846 log2_blksz;
1847 }
1848
1849 if (ext4fs_indir2_block == NULL) {
1850 ext4fs_indir2_block = zalloc(blksz);
1851 if (ext4fs_indir2_block == NULL) {
1852 printf("** TI ext2fs read block (indir 2 2)"
1853 "malloc failed. **\n");
1854 return -1;
1855 }
1856 ext4fs_indir2_size = blksz;
1857 ext4fs_indir2_blkno = -1;
1858 }
1859 if (blksz != ext4fs_indir2_size) {
1860 free(ext4fs_indir2_block);
1861 ext4fs_indir2_block = NULL;
1862 ext4fs_indir2_size = 0;
1863 ext4fs_indir2_blkno = -1;
1864 ext4fs_indir2_block = zalloc(blksz);
1865 if (ext4fs_indir2_block == NULL) {
1866 printf("** TI ext2fs read block (indir 2 2)"
1867 "malloc failed. **\n");
1868 return -1;
1869 }
1870 ext4fs_indir2_size = blksz;
1871 }
1872 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1873 perblock_parent]) <<
1874 log2_blksz)
1875 != ext4fs_indir2_blkno) {
1876 status = ext4fs_devread((lbaint_t)le32_to_cpu
1877 (ext4fs_indir1_block
1878 [rblock /
1879 perblock_parent]) <<
1880 log2_blksz, 0, blksz,
1881 (char *)ext4fs_indir2_block);
1882 if (status == 0) {
1883 printf("** TI ext2fs read block (indir 2 2)"
1884 "failed. **\n");
1885 return -1;
1886 }
1887 ext4fs_indir2_blkno =
1888 le32_to_cpu(ext4fs_indir1_block[rblock /
1889 perblock_parent])
1890 << log2_blksz;
1891 }
1892
1893 if (ext4fs_indir3_block == NULL) {
1894 ext4fs_indir3_block = zalloc(blksz);
1895 if (ext4fs_indir3_block == NULL) {
1896 printf("** TI ext2fs read block (indir 2 2)"
1897 "malloc failed. **\n");
1898 return -1;
1899 }
1900 ext4fs_indir3_size = blksz;
1901 ext4fs_indir3_blkno = -1;
1902 }
1903 if (blksz != ext4fs_indir3_size) {
1904 free(ext4fs_indir3_block);
1905 ext4fs_indir3_block = NULL;
1906 ext4fs_indir3_size = 0;
1907 ext4fs_indir3_blkno = -1;
1908 ext4fs_indir3_block = zalloc(blksz);
1909 if (ext4fs_indir3_block == NULL) {
1910 printf("** TI ext2fs read block (indir 2 2)"
1911 "malloc failed. **\n");
1912 return -1;
1913 }
1914 ext4fs_indir3_size = blksz;
1915 }
1916 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1917 /
1918 perblock_child]) <<
1919 log2_blksz) != ext4fs_indir3_blkno) {
1920 status =
1921 ext4fs_devread((lbaint_t)le32_to_cpu
1922 (ext4fs_indir2_block
1923 [(rblock / perblock_child)
1924 % (blksz / 4)]) << log2_blksz, 0,
1925 blksz, (char *)ext4fs_indir3_block);
1926 if (status == 0) {
1927 printf("** TI ext2fs read block (indir 2 2)"
1928 "failed. **\n");
1929 return -1;
1930 }
1931 ext4fs_indir3_blkno =
1932 le32_to_cpu(ext4fs_indir2_block[(rblock /
1933 perblock_child) %
1934 (blksz /
1935 4)]) <<
1936 log2_blksz;
1937 }
1938
1939 blknr = le32_to_cpu(ext4fs_indir3_block
1940 [rblock % perblock_child]);
1941 }
1942 debug("read_allocated_block %ld\n", blknr);
1943
1944 return blknr;
1945 }
1946
1947 /**
1948 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1949 * global pointers
1950 *
1951 * This function assures that for a file with the same name but different size
1952 * the sequential store on the ext4 filesystem will be correct.
1953 *
1954 * In this function the global data, responsible for internal representation
1955 * of the ext4 data are initialized to the reset state. Without this, during
1956 * replacement of the smaller file with the bigger truncation of new file was
1957 * performed.
1958 */
1959 void ext4fs_reinit_global(void)
1960 {
1961 if (ext4fs_indir1_block != NULL) {
1962 free(ext4fs_indir1_block);
1963 ext4fs_indir1_block = NULL;
1964 ext4fs_indir1_size = 0;
1965 ext4fs_indir1_blkno = -1;
1966 }
1967 if (ext4fs_indir2_block != NULL) {
1968 free(ext4fs_indir2_block);
1969 ext4fs_indir2_block = NULL;
1970 ext4fs_indir2_size = 0;
1971 ext4fs_indir2_blkno = -1;
1972 }
1973 if (ext4fs_indir3_block != NULL) {
1974 free(ext4fs_indir3_block);
1975 ext4fs_indir3_block = NULL;
1976 ext4fs_indir3_size = 0;
1977 ext4fs_indir3_blkno = -1;
1978 }
1979 }
1980 void ext4fs_close(void)
1981 {
1982 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1983 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1984 ext4fs_file = NULL;
1985 }
1986 if (ext4fs_root != NULL) {
1987 free(ext4fs_root);
1988 ext4fs_root = NULL;
1989 }
1990
1991 ext4fs_reinit_global();
1992 }
1993
1994 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1995 struct ext2fs_node **fnode, int *ftype)
1996 {
1997 unsigned int fpos = 0;
1998 int status;
1999 loff_t actread;
2000 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2001
2002 #ifdef DEBUG
2003 if (name != NULL)
2004 printf("Iterate dir %s\n", name);
2005 #endif /* of DEBUG */
2006 if (!diro->inode_read) {
2007 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2008 if (status == 0)
2009 return 0;
2010 }
2011 /* Search the file. */
2012 while (fpos < le32_to_cpu(diro->inode.size)) {
2013 struct ext2_dirent dirent;
2014
2015 status = ext4fs_read_file(diro, fpos,
2016 sizeof(struct ext2_dirent),
2017 (char *)&dirent, &actread);
2018 if (status < 0)
2019 return 0;
2020
2021 if (dirent.direntlen == 0) {
2022 printf("Failed to iterate over directory %s\n", name);
2023 return 0;
2024 }
2025
2026 if (dirent.namelen != 0) {
2027 char filename[dirent.namelen + 1];
2028 struct ext2fs_node *fdiro;
2029 int type = FILETYPE_UNKNOWN;
2030
2031 status = ext4fs_read_file(diro,
2032 fpos +
2033 sizeof(struct ext2_dirent),
2034 dirent.namelen, filename,
2035 &actread);
2036 if (status < 0)
2037 return 0;
2038
2039 fdiro = zalloc(sizeof(struct ext2fs_node));
2040 if (!fdiro)
2041 return 0;
2042
2043 fdiro->data = diro->data;
2044 fdiro->ino = le32_to_cpu(dirent.inode);
2045
2046 filename[dirent.namelen] = '\0';
2047
2048 if (dirent.filetype != FILETYPE_UNKNOWN) {
2049 fdiro->inode_read = 0;
2050
2051 if (dirent.filetype == FILETYPE_DIRECTORY)
2052 type = FILETYPE_DIRECTORY;
2053 else if (dirent.filetype == FILETYPE_SYMLINK)
2054 type = FILETYPE_SYMLINK;
2055 else if (dirent.filetype == FILETYPE_REG)
2056 type = FILETYPE_REG;
2057 } else {
2058 status = ext4fs_read_inode(diro->data,
2059 le32_to_cpu
2060 (dirent.inode),
2061 &fdiro->inode);
2062 if (status == 0) {
2063 free(fdiro);
2064 return 0;
2065 }
2066 fdiro->inode_read = 1;
2067
2068 if ((le16_to_cpu(fdiro->inode.mode) &
2069 FILETYPE_INO_MASK) ==
2070 FILETYPE_INO_DIRECTORY) {
2071 type = FILETYPE_DIRECTORY;
2072 } else if ((le16_to_cpu(fdiro->inode.mode)
2073 & FILETYPE_INO_MASK) ==
2074 FILETYPE_INO_SYMLINK) {
2075 type = FILETYPE_SYMLINK;
2076 } else if ((le16_to_cpu(fdiro->inode.mode)
2077 & FILETYPE_INO_MASK) ==
2078 FILETYPE_INO_REG) {
2079 type = FILETYPE_REG;
2080 }
2081 }
2082 #ifdef DEBUG
2083 printf("iterate >%s<\n", filename);
2084 #endif /* of DEBUG */
2085 if ((name != NULL) && (fnode != NULL)
2086 && (ftype != NULL)) {
2087 if (strcmp(filename, name) == 0) {
2088 *ftype = type;
2089 *fnode = fdiro;
2090 return 1;
2091 }
2092 } else {
2093 if (fdiro->inode_read == 0) {
2094 status = ext4fs_read_inode(diro->data,
2095 le32_to_cpu(
2096 dirent.inode),
2097 &fdiro->inode);
2098 if (status == 0) {
2099 free(fdiro);
2100 return 0;
2101 }
2102 fdiro->inode_read = 1;
2103 }
2104 switch (type) {
2105 case FILETYPE_DIRECTORY:
2106 printf("<DIR> ");
2107 break;
2108 case FILETYPE_SYMLINK:
2109 printf("<SYM> ");
2110 break;
2111 case FILETYPE_REG:
2112 printf(" ");
2113 break;
2114 default:
2115 printf("< ? > ");
2116 break;
2117 }
2118 printf("%10u %s\n",
2119 le32_to_cpu(fdiro->inode.size),
2120 filename);
2121 }
2122 free(fdiro);
2123 }
2124 fpos += le16_to_cpu(dirent.direntlen);
2125 }
2126 return 0;
2127 }
2128
2129 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2130 {
2131 char *symlink;
2132 struct ext2fs_node *diro = node;
2133 int status;
2134 loff_t actread;
2135
2136 if (!diro->inode_read) {
2137 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2138 if (status == 0)
2139 return NULL;
2140 }
2141 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2142 if (!symlink)
2143 return NULL;
2144
2145 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2146 strncpy(symlink, diro->inode.b.symlink,
2147 le32_to_cpu(diro->inode.size));
2148 } else {
2149 status = ext4fs_read_file(diro, 0,
2150 le32_to_cpu(diro->inode.size),
2151 symlink, &actread);
2152 if ((status < 0) || (actread == 0)) {
2153 free(symlink);
2154 return NULL;
2155 }
2156 }
2157 symlink[le32_to_cpu(diro->inode.size)] = '\0';
2158 return symlink;
2159 }
2160
2161 static int ext4fs_find_file1(const char *currpath,
2162 struct ext2fs_node *currroot,
2163 struct ext2fs_node **currfound, int *foundtype)
2164 {
2165 char fpath[strlen(currpath) + 1];
2166 char *name = fpath;
2167 char *next;
2168 int status;
2169 int type = FILETYPE_DIRECTORY;
2170 struct ext2fs_node *currnode = currroot;
2171 struct ext2fs_node *oldnode = currroot;
2172
2173 strncpy(fpath, currpath, strlen(currpath) + 1);
2174
2175 /* Remove all leading slashes. */
2176 while (*name == '/')
2177 name++;
2178
2179 if (!*name) {
2180 *currfound = currnode;
2181 return 1;
2182 }
2183
2184 for (;;) {
2185 int found;
2186
2187 /* Extract the actual part from the pathname. */
2188 next = strchr(name, '/');
2189 if (next) {
2190 /* Remove all leading slashes. */
2191 while (*next == '/')
2192 *(next++) = '\0';
2193 }
2194
2195 if (type != FILETYPE_DIRECTORY) {
2196 ext4fs_free_node(currnode, currroot);
2197 return 0;
2198 }
2199
2200 oldnode = currnode;
2201
2202 /* Iterate over the directory. */
2203 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2204 if (found == 0)
2205 return 0;
2206
2207 if (found == -1)
2208 break;
2209
2210 /* Read in the symlink and follow it. */
2211 if (type == FILETYPE_SYMLINK) {
2212 char *symlink;
2213
2214 /* Test if the symlink does not loop. */
2215 if (++symlinknest == 8) {
2216 ext4fs_free_node(currnode, currroot);
2217 ext4fs_free_node(oldnode, currroot);
2218 return 0;
2219 }
2220
2221 symlink = ext4fs_read_symlink(currnode);
2222 ext4fs_free_node(currnode, currroot);
2223
2224 if (!symlink) {
2225 ext4fs_free_node(oldnode, currroot);
2226 return 0;
2227 }
2228
2229 debug("Got symlink >%s<\n", symlink);
2230
2231 if (symlink[0] == '/') {
2232 ext4fs_free_node(oldnode, currroot);
2233 oldnode = &ext4fs_root->diropen;
2234 }
2235
2236 /* Lookup the node the symlink points to. */
2237 status = ext4fs_find_file1(symlink, oldnode,
2238 &currnode, &type);
2239
2240 free(symlink);
2241
2242 if (status == 0) {
2243 ext4fs_free_node(oldnode, currroot);
2244 return 0;
2245 }
2246 }
2247
2248 ext4fs_free_node(oldnode, currroot);
2249
2250 /* Found the node! */
2251 if (!next || *next == '\0') {
2252 *currfound = currnode;
2253 *foundtype = type;
2254 return 1;
2255 }
2256 name = next;
2257 }
2258 return -1;
2259 }
2260
2261 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2262 struct ext2fs_node **foundnode, int expecttype)
2263 {
2264 int status;
2265 int foundtype = FILETYPE_DIRECTORY;
2266
2267 symlinknest = 0;
2268 if (!path)
2269 return 0;
2270
2271 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2272 if (status == 0)
2273 return 0;
2274
2275 /* Check if the node that was found was of the expected type. */
2276 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2277 return 0;
2278 else if ((expecttype == FILETYPE_DIRECTORY)
2279 && (foundtype != expecttype))
2280 return 0;
2281
2282 return 1;
2283 }
2284
2285 int ext4fs_open(const char *filename, loff_t *len)
2286 {
2287 struct ext2fs_node *fdiro = NULL;
2288 int status;
2289
2290 if (ext4fs_root == NULL)
2291 return -1;
2292
2293 ext4fs_file = NULL;
2294 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2295 FILETYPE_REG);
2296 if (status == 0)
2297 goto fail;
2298
2299 if (!fdiro->inode_read) {
2300 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2301 &fdiro->inode);
2302 if (status == 0)
2303 goto fail;
2304 }
2305 *len = le32_to_cpu(fdiro->inode.size);
2306 ext4fs_file = fdiro;
2307
2308 return 0;
2309 fail:
2310 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2311
2312 return -1;
2313 }
2314
2315 int ext4fs_mount(unsigned part_length)
2316 {
2317 struct ext2_data *data;
2318 int status;
2319 struct ext_filesystem *fs = get_fs();
2320 data = zalloc(SUPERBLOCK_SIZE);
2321 if (!data)
2322 return 0;
2323
2324 /* Read the superblock. */
2325 status = ext4_read_superblock((char *)&data->sblock);
2326
2327 if (status == 0)
2328 goto fail;
2329
2330 /* Make sure this is an ext2 filesystem. */
2331 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2332 goto fail;
2333
2334
2335 if (le32_to_cpu(data->sblock.revision_level) == 0) {
2336 fs->inodesz = 128;
2337 } else {
2338 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2339 __le32_to_cpu(data->sblock.feature_compatibility),
2340 __le32_to_cpu(data->sblock.feature_incompat),
2341 __le32_to_cpu(data->sblock.feature_ro_compat));
2342
2343 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2344 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2345 EXT4_FEATURE_INCOMPAT_64BIT ?
2346 le16_to_cpu(data->sblock.descriptor_size) : 32;
2347 }
2348
2349 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2350 le32_to_cpu(data->sblock.revision_level),
2351 fs->inodesz, fs->gdsize);
2352
2353 data->diropen.data = data;
2354 data->diropen.ino = 2;
2355 data->diropen.inode_read = 1;
2356 data->inode = &data->diropen.inode;
2357
2358 status = ext4fs_read_inode(data, 2, data->inode);
2359 if (status == 0)
2360 goto fail;
2361
2362 ext4fs_root = data;
2363
2364 return 1;
2365 fail:
2366 printf("Failed to mount ext2 filesystem...\n");
2367 free(data);
2368 ext4fs_root = NULL;
2369
2370 return 0;
2371 }
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