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29308e3b44741b8ee484158223df5976d428980d
[project/bcm63xx/u-boot.git] / fs / ext4 / ext4_common.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2011 - 2012 Samsung Electronics
4 * EXT4 filesystem implementation in Uboot by
5 * Uma Shankar <uma.shankar@samsung.com>
6 * Manjunatha C Achar <a.manjunatha@samsung.com>
7 *
8 * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
9 *
10 * (C) Copyright 2004
11 * esd gmbh <www.esd-electronics.com>
12 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
13 *
14 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
15 * GRUB -- GRand Unified Bootloader
16 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
17 *
18 * ext4write : Based on generic ext4 protocol.
19 */
20
21 #include <common.h>
22 #include <ext_common.h>
23 #include <ext4fs.h>
24 #include <malloc.h>
25 #include <memalign.h>
26 #include <stddef.h>
27 #include <linux/stat.h>
28 #include <linux/time.h>
29 #include <asm/byteorder.h>
30 #include "ext4_common.h"
31
32 struct ext2_data *ext4fs_root;
33 struct ext2fs_node *ext4fs_file;
34 __le32 *ext4fs_indir1_block;
35 int ext4fs_indir1_size;
36 int ext4fs_indir1_blkno = -1;
37 __le32 *ext4fs_indir2_block;
38 int ext4fs_indir2_size;
39 int ext4fs_indir2_blkno = -1;
40
41 __le32 *ext4fs_indir3_block;
42 int ext4fs_indir3_size;
43 int ext4fs_indir3_blkno = -1;
44 struct ext2_inode *g_parent_inode;
45 static int symlinknest;
46
47 #if defined(CONFIG_EXT4_WRITE)
48 struct ext2_block_group *ext4fs_get_group_descriptor
49 (const struct ext_filesystem *fs, uint32_t bg_idx)
50 {
51 return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
52 }
53
54 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
55 {
56 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
57 }
58
59 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
60 {
61 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
62 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
63 free_blocks--;
64
65 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
66 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
67 }
68
69 static inline void ext4fs_bg_free_inodes_dec
70 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
71 {
72 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
73 if (fs->gdsize == 64)
74 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
75 free_inodes--;
76
77 bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
78 if (fs->gdsize == 64)
79 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
80 }
81
82 static inline void ext4fs_bg_free_blocks_dec
83 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
84 {
85 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
86 if (fs->gdsize == 64)
87 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
88 free_blocks--;
89
90 bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
91 if (fs->gdsize == 64)
92 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
93 }
94
95 static inline void ext4fs_bg_itable_unused_dec
96 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
97 {
98 uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
99 if (fs->gdsize == 64)
100 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
101 free_inodes--;
102
103 bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
104 if (fs->gdsize == 64)
105 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
106 }
107
108 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
109 {
110 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
111 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
112 return free_blocks;
113 }
114
115 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
116 {
117 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
118 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
119 }
120
121 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
122 const struct ext_filesystem *fs)
123 {
124 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
125 if (fs->gdsize == 64)
126 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
127 return free_blocks;
128 }
129
130 static inline
131 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
132 const struct ext_filesystem *fs)
133 {
134 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
135 if (fs->gdsize == 64)
136 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
137 return free_inodes;
138 }
139
140 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
141 {
142 return le16_to_cpu(bg->bg_flags);
143 }
144
145 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
146 uint16_t flags)
147 {
148 bg->bg_flags = cpu_to_le16(flags);
149 }
150
151 /* Block number of the block bitmap */
152 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
153 const struct ext_filesystem *fs)
154 {
155 uint64_t block_nr = le32_to_cpu(bg->block_id);
156 if (fs->gdsize == 64)
157 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
158 return block_nr;
159 }
160
161 /* Block number of the inode bitmap */
162 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
163 const struct ext_filesystem *fs)
164 {
165 uint64_t block_nr = le32_to_cpu(bg->inode_id);
166 if (fs->gdsize == 64)
167 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
168 return block_nr;
169 }
170 #endif
171
172 /* Block number of the inode table */
173 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
174 const struct ext_filesystem *fs)
175 {
176 uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
177 if (fs->gdsize == 64)
178 block_nr +=
179 (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
180 return block_nr;
181 }
182
183 #if defined(CONFIG_EXT4_WRITE)
184 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
185 {
186 uint32_t res = size / n;
187 if (res * n != size)
188 res++;
189
190 return res;
191 }
192
193 void put_ext4(uint64_t off, void *buf, uint32_t size)
194 {
195 uint64_t startblock;
196 uint64_t remainder;
197 unsigned char *temp_ptr = NULL;
198 struct ext_filesystem *fs = get_fs();
199 int log2blksz = fs->dev_desc->log2blksz;
200 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
201
202 startblock = off >> log2blksz;
203 startblock += part_offset;
204 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
205
206 if (fs->dev_desc == NULL)
207 return;
208
209 if ((startblock + (size >> log2blksz)) >
210 (part_offset + fs->total_sect)) {
211 printf("part_offset is " LBAFU "\n", part_offset);
212 printf("total_sector is %llu\n", fs->total_sect);
213 printf("error: overflow occurs\n");
214 return;
215 }
216
217 if (remainder) {
218 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
219 temp_ptr = sec_buf;
220 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
221 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
222 } else {
223 if (size >> log2blksz != 0) {
224 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
225 (unsigned long *)buf);
226 } else {
227 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
228 temp_ptr = sec_buf;
229 memcpy(temp_ptr, buf, size);
230 blk_dwrite(fs->dev_desc, startblock, 1,
231 (unsigned long *)sec_buf);
232 }
233 }
234 }
235
236 static int _get_new_inode_no(unsigned char *buffer)
237 {
238 struct ext_filesystem *fs = get_fs();
239 unsigned char input;
240 int operand, status;
241 int count = 1;
242 int j = 0;
243
244 /* get the blocksize of the filesystem */
245 unsigned char *ptr = buffer;
246 while (*ptr == 255) {
247 ptr++;
248 count += 8;
249 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
250 return -1;
251 }
252
253 for (j = 0; j < fs->blksz; j++) {
254 input = *ptr;
255 int i = 0;
256 while (i <= 7) {
257 operand = 1 << i;
258 status = input & operand;
259 if (status) {
260 i++;
261 count++;
262 } else {
263 *ptr |= operand;
264 return count;
265 }
266 }
267 ptr = ptr + 1;
268 }
269
270 return -1;
271 }
272
273 static int _get_new_blk_no(unsigned char *buffer)
274 {
275 int operand;
276 int count = 0;
277 int i;
278 unsigned char *ptr = buffer;
279 struct ext_filesystem *fs = get_fs();
280
281 while (*ptr == 255) {
282 ptr++;
283 count += 8;
284 if (count == (fs->blksz * 8))
285 return -1;
286 }
287
288 if (fs->blksz == 1024)
289 count += 1;
290
291 for (i = 0; i <= 7; i++) {
292 operand = 1 << i;
293 if (*ptr & operand) {
294 count++;
295 } else {
296 *ptr |= operand;
297 return count;
298 }
299 }
300
301 return -1;
302 }
303
304 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
305 {
306 int i, remainder, status;
307 unsigned char *ptr = buffer;
308 unsigned char operand;
309 i = blockno / 8;
310 remainder = blockno % 8;
311 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
312
313 i = i - (index * blocksize);
314 if (blocksize != 1024) {
315 ptr = ptr + i;
316 operand = 1 << remainder;
317 status = *ptr & operand;
318 if (status)
319 return -1;
320
321 *ptr = *ptr | operand;
322 return 0;
323 } else {
324 if (remainder == 0) {
325 ptr = ptr + i - 1;
326 operand = (1 << 7);
327 } else {
328 ptr = ptr + i;
329 operand = (1 << (remainder - 1));
330 }
331 status = *ptr & operand;
332 if (status)
333 return -1;
334
335 *ptr = *ptr | operand;
336 return 0;
337 }
338 }
339
340 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
341 {
342 int i, remainder, status;
343 unsigned char *ptr = buffer;
344 unsigned char operand;
345 i = blockno / 8;
346 remainder = blockno % 8;
347 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
348
349 i = i - (index * blocksize);
350 if (blocksize != 1024) {
351 ptr = ptr + i;
352 operand = (1 << remainder);
353 status = *ptr & operand;
354 if (status)
355 *ptr = *ptr & ~(operand);
356 } else {
357 if (remainder == 0) {
358 ptr = ptr + i - 1;
359 operand = (1 << 7);
360 } else {
361 ptr = ptr + i;
362 operand = (1 << (remainder - 1));
363 }
364 status = *ptr & operand;
365 if (status)
366 *ptr = *ptr & ~(operand);
367 }
368 }
369
370 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
371 {
372 int i, remainder, status;
373 unsigned char *ptr = buffer;
374 unsigned char operand;
375
376 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
377 i = inode_no / 8;
378 remainder = inode_no % 8;
379 if (remainder == 0) {
380 ptr = ptr + i - 1;
381 operand = (1 << 7);
382 } else {
383 ptr = ptr + i;
384 operand = (1 << (remainder - 1));
385 }
386 status = *ptr & operand;
387 if (status)
388 return -1;
389
390 *ptr = *ptr | operand;
391
392 return 0;
393 }
394
395 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
396 {
397 int i, remainder, status;
398 unsigned char *ptr = buffer;
399 unsigned char operand;
400
401 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
402 i = inode_no / 8;
403 remainder = inode_no % 8;
404 if (remainder == 0) {
405 ptr = ptr + i - 1;
406 operand = (1 << 7);
407 } else {
408 ptr = ptr + i;
409 operand = (1 << (remainder - 1));
410 }
411 status = *ptr & operand;
412 if (status)
413 *ptr = *ptr & ~(operand);
414 }
415
416 uint16_t ext4fs_checksum_update(uint32_t i)
417 {
418 struct ext2_block_group *desc;
419 struct ext_filesystem *fs = get_fs();
420 uint16_t crc = 0;
421 __le32 le32_i = cpu_to_le32(i);
422
423 desc = ext4fs_get_group_descriptor(fs, i);
424 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
425 int offset = offsetof(struct ext2_block_group, bg_checksum);
426
427 crc = ext2fs_crc16(~0, fs->sb->unique_id,
428 sizeof(fs->sb->unique_id));
429 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
430 crc = ext2fs_crc16(crc, desc, offset);
431 offset += sizeof(desc->bg_checksum); /* skip checksum */
432 assert(offset == sizeof(*desc));
433 if (offset < fs->gdsize) {
434 crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
435 fs->gdsize - offset);
436 }
437 }
438
439 return crc;
440 }
441
442 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
443 {
444 int dentry_length;
445 int sizeof_void_space;
446 int new_entry_byte_reqd;
447 short padding_factor = 0;
448
449 if (dir->namelen % 4 != 0)
450 padding_factor = 4 - (dir->namelen % 4);
451
452 dentry_length = sizeof(struct ext2_dirent) +
453 dir->namelen + padding_factor;
454 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
455 if (sizeof_void_space == 0)
456 return 0;
457
458 padding_factor = 0;
459 if (strlen(filename) % 4 != 0)
460 padding_factor = 4 - (strlen(filename) % 4);
461
462 new_entry_byte_reqd = strlen(filename) +
463 sizeof(struct ext2_dirent) + padding_factor;
464 if (sizeof_void_space >= new_entry_byte_reqd) {
465 dir->direntlen = cpu_to_le16(dentry_length);
466 return sizeof_void_space;
467 }
468
469 return 0;
470 }
471
472 int ext4fs_update_parent_dentry(char *filename, int file_type)
473 {
474 unsigned int *zero_buffer = NULL;
475 char *root_first_block_buffer = NULL;
476 int blk_idx;
477 long int first_block_no_of_root = 0;
478 int totalbytes = 0;
479 unsigned int new_entry_byte_reqd;
480 int sizeof_void_space = 0;
481 int templength = 0;
482 int inodeno = -1;
483 int status;
484 struct ext_filesystem *fs = get_fs();
485 /* directory entry */
486 struct ext2_dirent *dir;
487 char *temp_dir = NULL;
488 uint32_t new_blk_no;
489 uint32_t new_size;
490 uint32_t new_blockcnt;
491 uint32_t directory_blocks;
492
493 zero_buffer = zalloc(fs->blksz);
494 if (!zero_buffer) {
495 printf("No Memory\n");
496 return -1;
497 }
498 root_first_block_buffer = zalloc(fs->blksz);
499 if (!root_first_block_buffer) {
500 free(zero_buffer);
501 printf("No Memory\n");
502 return -1;
503 }
504 new_entry_byte_reqd = ROUND(strlen(filename) +
505 sizeof(struct ext2_dirent), 4);
506 restart:
507 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
508 LOG2_BLOCK_SIZE(ext4fs_root);
509 blk_idx = directory_blocks - 1;
510
511 restart_read:
512 /* read the block no allocated to a file */
513 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx,
514 NULL);
515 if (first_block_no_of_root <= 0)
516 goto fail;
517
518 status = ext4fs_devread((lbaint_t)first_block_no_of_root
519 * fs->sect_perblk,
520 0, fs->blksz, root_first_block_buffer);
521 if (status == 0)
522 goto fail;
523
524 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
525 goto fail;
526 dir = (struct ext2_dirent *)root_first_block_buffer;
527 totalbytes = 0;
528
529 while (le16_to_cpu(dir->direntlen) > 0) {
530 unsigned short used_len = ROUND(dir->namelen +
531 sizeof(struct ext2_dirent), 4);
532
533 /* last entry of block */
534 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
535
536 /* check if new entry fits */
537 if ((used_len + new_entry_byte_reqd) <=
538 le16_to_cpu(dir->direntlen)) {
539 dir->direntlen = cpu_to_le16(used_len);
540 break;
541 } else {
542 if (blk_idx > 0) {
543 printf("Block full, trying previous\n");
544 blk_idx--;
545 goto restart_read;
546 }
547 printf("All blocks full: Allocate new\n");
548
549 if (le32_to_cpu(g_parent_inode->flags) &
550 EXT4_EXTENTS_FL) {
551 printf("Directory uses extents\n");
552 goto fail;
553 }
554 if (directory_blocks >= INDIRECT_BLOCKS) {
555 printf("Directory exceeds limit\n");
556 goto fail;
557 }
558 new_blk_no = ext4fs_get_new_blk_no();
559 if (new_blk_no == -1) {
560 printf("no block left to assign\n");
561 goto fail;
562 }
563 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
564 g_parent_inode->b.blocks.
565 dir_blocks[directory_blocks] =
566 cpu_to_le32(new_blk_no);
567
568 new_size = le32_to_cpu(g_parent_inode->size);
569 new_size += fs->blksz;
570 g_parent_inode->size = cpu_to_le32(new_size);
571
572 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
573 new_blockcnt += fs->sect_perblk;
574 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
575
576 if (ext4fs_put_metadata
577 (root_first_block_buffer,
578 first_block_no_of_root))
579 goto fail;
580 goto restart;
581 }
582 }
583
584 templength = le16_to_cpu(dir->direntlen);
585 totalbytes = totalbytes + templength;
586 sizeof_void_space = check_void_in_dentry(dir, filename);
587 if (sizeof_void_space)
588 break;
589
590 dir = (struct ext2_dirent *)((char *)dir + templength);
591 }
592
593 /* make a pointer ready for creating next directory entry */
594 templength = le16_to_cpu(dir->direntlen);
595 totalbytes = totalbytes + templength;
596 dir = (struct ext2_dirent *)((char *)dir + templength);
597
598 /* get the next available inode number */
599 inodeno = ext4fs_get_new_inode_no();
600 if (inodeno == -1) {
601 printf("no inode left to assign\n");
602 goto fail;
603 }
604 dir->inode = cpu_to_le32(inodeno);
605 if (sizeof_void_space)
606 dir->direntlen = cpu_to_le16(sizeof_void_space);
607 else
608 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
609
610 dir->namelen = strlen(filename);
611 dir->filetype = FILETYPE_REG; /* regular file */
612 temp_dir = (char *)dir;
613 temp_dir = temp_dir + sizeof(struct ext2_dirent);
614 memcpy(temp_dir, filename, strlen(filename));
615
616 /* update or write the 1st block of root inode */
617 if (ext4fs_put_metadata(root_first_block_buffer,
618 first_block_no_of_root))
619 goto fail;
620
621 fail:
622 free(zero_buffer);
623 free(root_first_block_buffer);
624
625 return inodeno;
626 }
627
628 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
629 {
630 int status;
631 int inodeno = 0;
632 int offset;
633 int blk_idx;
634 long int blknr;
635 char *block_buffer = NULL;
636 struct ext2_dirent *dir = NULL;
637 struct ext_filesystem *fs = get_fs();
638 uint32_t directory_blocks;
639 char *direntname;
640
641 directory_blocks = le32_to_cpu(parent_inode->size) >>
642 LOG2_BLOCK_SIZE(ext4fs_root);
643
644 block_buffer = zalloc(fs->blksz);
645 if (!block_buffer)
646 goto fail;
647
648 /* get the block no allocated to a file */
649 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
650 blknr = read_allocated_block(parent_inode, blk_idx, NULL);
651 if (blknr <= 0)
652 goto fail;
653
654 /* read the directory block */
655 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
656 0, fs->blksz, (char *)block_buffer);
657 if (status == 0)
658 goto fail;
659
660 offset = 0;
661 do {
662 if (offset & 3) {
663 printf("Badly aligned ext2_dirent\n");
664 break;
665 }
666
667 dir = (struct ext2_dirent *)(block_buffer + offset);
668 direntname = (char*)(dir) + sizeof(struct ext2_dirent);
669
670 int direntlen = le16_to_cpu(dir->direntlen);
671 if (direntlen < sizeof(struct ext2_dirent))
672 break;
673
674 if (dir->inode && (strlen(dirname) == dir->namelen) &&
675 (strncmp(dirname, direntname, dir->namelen) == 0)) {
676 inodeno = le32_to_cpu(dir->inode);
677 break;
678 }
679
680 offset += direntlen;
681
682 } while (offset < fs->blksz);
683
684 if (inodeno > 0) {
685 free(block_buffer);
686 return inodeno;
687 }
688 }
689
690 fail:
691 free(block_buffer);
692
693 return -1;
694 }
695
696 static int find_dir_depth(char *dirname)
697 {
698 char *token = strtok(dirname, "/");
699 int count = 0;
700 while (token != NULL) {
701 token = strtok(NULL, "/");
702 count++;
703 }
704 return count + 1 + 1;
705 /*
706 * for example for string /home/temp
707 * depth=home(1)+temp(1)+1 extra for NULL;
708 * so count is 4;
709 */
710 }
711
712 static int parse_path(char **arr, char *dirname)
713 {
714 char *token = strtok(dirname, "/");
715 int i = 0;
716
717 /* add root */
718 arr[i] = zalloc(strlen("/") + 1);
719 if (!arr[i])
720 return -ENOMEM;
721 memcpy(arr[i++], "/", strlen("/"));
722
723 /* add each path entry after root */
724 while (token != NULL) {
725 arr[i] = zalloc(strlen(token) + 1);
726 if (!arr[i])
727 return -ENOMEM;
728 memcpy(arr[i++], token, strlen(token));
729 token = strtok(NULL, "/");
730 }
731 arr[i] = NULL;
732
733 return 0;
734 }
735
736 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
737 {
738 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
739 return -1;
740
741 return 0;
742 }
743
744 /*
745 * Function: ext4fs_get_parent_inode_num
746 * Return Value: inode Number of the parent directory of file/Directory to be
747 * created
748 * dirname : Input parmater, input path name of the file/directory to be created
749 * dname : Output parameter, to be filled with the name of the directory
750 * extracted from dirname
751 */
752 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
753 {
754 int i;
755 int depth = 0;
756 int matched_inode_no;
757 int result_inode_no = -1;
758 char **ptr = NULL;
759 char *depth_dirname = NULL;
760 char *parse_dirname = NULL;
761 struct ext2_inode *parent_inode = NULL;
762 struct ext2_inode *first_inode = NULL;
763 struct ext2_inode temp_inode;
764
765 if (*dirname != '/') {
766 printf("Please supply Absolute path\n");
767 return -1;
768 }
769
770 /* TODO: input validation make equivalent to linux */
771 depth_dirname = zalloc(strlen(dirname) + 1);
772 if (!depth_dirname)
773 return -ENOMEM;
774
775 memcpy(depth_dirname, dirname, strlen(dirname));
776 depth = find_dir_depth(depth_dirname);
777 parse_dirname = zalloc(strlen(dirname) + 1);
778 if (!parse_dirname)
779 goto fail;
780 memcpy(parse_dirname, dirname, strlen(dirname));
781
782 /* allocate memory for each directory level */
783 ptr = zalloc((depth) * sizeof(char *));
784 if (!ptr)
785 goto fail;
786 if (parse_path(ptr, parse_dirname))
787 goto fail;
788 parent_inode = zalloc(sizeof(struct ext2_inode));
789 if (!parent_inode)
790 goto fail;
791 first_inode = zalloc(sizeof(struct ext2_inode));
792 if (!first_inode)
793 goto fail;
794 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
795 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
796 if (flags & F_FILE)
797 result_inode_no = EXT2_ROOT_INO;
798 for (i = 1; i < depth; i++) {
799 matched_inode_no = search_dir(parent_inode, ptr[i]);
800 if (matched_inode_no == -1) {
801 if (ptr[i + 1] == NULL && i == 1) {
802 result_inode_no = EXT2_ROOT_INO;
803 goto end;
804 } else {
805 if (ptr[i + 1] == NULL)
806 break;
807 printf("Invalid path\n");
808 result_inode_no = -1;
809 goto fail;
810 }
811 } else {
812 if (ptr[i + 1] != NULL) {
813 memset(parent_inode, '\0',
814 sizeof(struct ext2_inode));
815 if (ext4fs_iget(matched_inode_no,
816 parent_inode)) {
817 result_inode_no = -1;
818 goto fail;
819 }
820 result_inode_no = matched_inode_no;
821 } else {
822 break;
823 }
824 }
825 }
826
827 end:
828 if (i == 1)
829 matched_inode_no = search_dir(first_inode, ptr[i]);
830 else
831 matched_inode_no = search_dir(parent_inode, ptr[i]);
832
833 if (matched_inode_no != -1) {
834 ext4fs_iget(matched_inode_no, &temp_inode);
835 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
836 printf("It is a Directory\n");
837 result_inode_no = -1;
838 goto fail;
839 }
840 }
841
842 if (strlen(ptr[i]) > 256) {
843 result_inode_no = -1;
844 goto fail;
845 }
846 memcpy(dname, ptr[i], strlen(ptr[i]));
847
848 fail:
849 free(depth_dirname);
850 free(parse_dirname);
851 for (i = 0; i < depth; i++) {
852 if (!ptr[i])
853 break;
854 free(ptr[i]);
855 }
856 free(ptr);
857 free(parent_inode);
858 free(first_inode);
859
860 return result_inode_no;
861 }
862
863 static int unlink_filename(char *filename, unsigned int blknr)
864 {
865 int status;
866 int inodeno = 0;
867 int offset;
868 char *block_buffer = NULL;
869 struct ext2_dirent *dir = NULL;
870 struct ext2_dirent *previous_dir;
871 struct ext_filesystem *fs = get_fs();
872 int ret = -1;
873 char *direntname;
874
875 block_buffer = zalloc(fs->blksz);
876 if (!block_buffer)
877 return -ENOMEM;
878
879 /* read the directory block */
880 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
881 fs->blksz, block_buffer);
882 if (status == 0)
883 goto fail;
884
885 offset = 0;
886 do {
887 if (offset & 3) {
888 printf("Badly aligned ext2_dirent\n");
889 break;
890 }
891
892 previous_dir = dir;
893 dir = (struct ext2_dirent *)(block_buffer + offset);
894 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
895
896 int direntlen = le16_to_cpu(dir->direntlen);
897 if (direntlen < sizeof(struct ext2_dirent))
898 break;
899
900 if (dir->inode && (strlen(filename) == dir->namelen) &&
901 (strncmp(direntname, filename, dir->namelen) == 0)) {
902 inodeno = le32_to_cpu(dir->inode);
903 break;
904 }
905
906 offset += direntlen;
907
908 } while (offset < fs->blksz);
909
910 if (inodeno > 0) {
911 printf("file found, deleting\n");
912 if (ext4fs_log_journal(block_buffer, blknr))
913 goto fail;
914
915 if (previous_dir) {
916 /* merge dir entry with predecessor */
917 uint16_t new_len;
918 new_len = le16_to_cpu(previous_dir->direntlen);
919 new_len += le16_to_cpu(dir->direntlen);
920 previous_dir->direntlen = cpu_to_le16(new_len);
921 } else {
922 /* invalidate dir entry */
923 dir->inode = 0;
924 }
925 if (ext4fs_put_metadata(block_buffer, blknr))
926 goto fail;
927 ret = inodeno;
928 }
929 fail:
930 free(block_buffer);
931
932 return ret;
933 }
934
935 int ext4fs_filename_unlink(char *filename)
936 {
937 int blk_idx;
938 long int blknr = -1;
939 int inodeno = -1;
940 uint32_t directory_blocks;
941
942 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
943 LOG2_BLOCK_SIZE(ext4fs_root);
944
945 /* read the block no allocated to a file */
946 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
947 blknr = read_allocated_block(g_parent_inode, blk_idx, NULL);
948 if (blknr <= 0)
949 break;
950 inodeno = unlink_filename(filename, blknr);
951 if (inodeno != -1)
952 return inodeno;
953 }
954
955 return -1;
956 }
957
958 uint32_t ext4fs_get_new_blk_no(void)
959 {
960 short i;
961 short status;
962 int remainder;
963 unsigned int bg_idx;
964 static int prev_bg_bitmap_index = -1;
965 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
966 struct ext_filesystem *fs = get_fs();
967 char *journal_buffer = zalloc(fs->blksz);
968 char *zero_buffer = zalloc(fs->blksz);
969 if (!journal_buffer || !zero_buffer)
970 goto fail;
971
972 if (fs->first_pass_bbmap == 0) {
973 for (i = 0; i < fs->no_blkgrp; i++) {
974 struct ext2_block_group *bgd = NULL;
975 bgd = ext4fs_get_group_descriptor(fs, i);
976 if (ext4fs_bg_get_free_blocks(bgd, fs)) {
977 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
978 uint64_t b_bitmap_blk =
979 ext4fs_bg_get_block_id(bgd, fs);
980 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
981 memcpy(fs->blk_bmaps[i], zero_buffer,
982 fs->blksz);
983 put_ext4(b_bitmap_blk * fs->blksz,
984 fs->blk_bmaps[i], fs->blksz);
985 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
986 ext4fs_bg_set_flags(bgd, bg_flags);
987 }
988 fs->curr_blkno =
989 _get_new_blk_no(fs->blk_bmaps[i]);
990 if (fs->curr_blkno == -1)
991 /* block bitmap is completely filled */
992 continue;
993 fs->curr_blkno = fs->curr_blkno +
994 (i * fs->blksz * 8);
995 fs->first_pass_bbmap++;
996 ext4fs_bg_free_blocks_dec(bgd, fs);
997 ext4fs_sb_free_blocks_dec(fs->sb);
998 status = ext4fs_devread(b_bitmap_blk *
999 fs->sect_perblk,
1000 0, fs->blksz,
1001 journal_buffer);
1002 if (status == 0)
1003 goto fail;
1004 if (ext4fs_log_journal(journal_buffer,
1005 b_bitmap_blk))
1006 goto fail;
1007 goto success;
1008 } else {
1009 debug("no space left on block group %d\n", i);
1010 }
1011 }
1012
1013 goto fail;
1014 } else {
1015 fs->curr_blkno++;
1016 restart:
1017 /* get the blockbitmap index respective to blockno */
1018 bg_idx = fs->curr_blkno / blk_per_grp;
1019 if (fs->blksz == 1024) {
1020 remainder = fs->curr_blkno % blk_per_grp;
1021 if (!remainder)
1022 bg_idx--;
1023 }
1024
1025 /*
1026 * To skip completely filled block group bitmaps
1027 * Optimize the block allocation
1028 */
1029 if (bg_idx >= fs->no_blkgrp)
1030 goto fail;
1031
1032 struct ext2_block_group *bgd = NULL;
1033 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1034 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1035 debug("block group %u is full. Skipping\n", bg_idx);
1036 fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1037 if (fs->blksz == 1024)
1038 fs->curr_blkno += 1;
1039 goto restart;
1040 }
1041
1042 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1043 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1044 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1045 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1046 put_ext4(b_bitmap_blk * fs->blksz,
1047 zero_buffer, fs->blksz);
1048 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1049 ext4fs_bg_set_flags(bgd, bg_flags);
1050 }
1051
1052 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1053 bg_idx) != 0) {
1054 debug("going for restart for the block no %ld %u\n",
1055 fs->curr_blkno, bg_idx);
1056 fs->curr_blkno++;
1057 goto restart;
1058 }
1059
1060 /* journal backup */
1061 if (prev_bg_bitmap_index != bg_idx) {
1062 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1063 0, fs->blksz, journal_buffer);
1064 if (status == 0)
1065 goto fail;
1066 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1067 goto fail;
1068
1069 prev_bg_bitmap_index = bg_idx;
1070 }
1071 ext4fs_bg_free_blocks_dec(bgd, fs);
1072 ext4fs_sb_free_blocks_dec(fs->sb);
1073 goto success;
1074 }
1075 success:
1076 free(journal_buffer);
1077 free(zero_buffer);
1078
1079 return fs->curr_blkno;
1080 fail:
1081 free(journal_buffer);
1082 free(zero_buffer);
1083
1084 return -1;
1085 }
1086
1087 int ext4fs_get_new_inode_no(void)
1088 {
1089 short i;
1090 short status;
1091 unsigned int ibmap_idx;
1092 static int prev_inode_bitmap_index = -1;
1093 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1094 struct ext_filesystem *fs = get_fs();
1095 char *journal_buffer = zalloc(fs->blksz);
1096 char *zero_buffer = zalloc(fs->blksz);
1097 if (!journal_buffer || !zero_buffer)
1098 goto fail;
1099 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1100 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1101
1102 if (fs->first_pass_ibmap == 0) {
1103 for (i = 0; i < fs->no_blkgrp; i++) {
1104 uint32_t free_inodes;
1105 struct ext2_block_group *bgd = NULL;
1106 bgd = ext4fs_get_group_descriptor(fs, i);
1107 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1108 if (free_inodes) {
1109 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1110 uint64_t i_bitmap_blk =
1111 ext4fs_bg_get_inode_id(bgd, fs);
1112 if (has_gdt_chksum)
1113 bgd->bg_itable_unused = free_inodes;
1114 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1115 put_ext4(i_bitmap_blk * fs->blksz,
1116 zero_buffer, fs->blksz);
1117 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1118 ext4fs_bg_set_flags(bgd, bg_flags);
1119 memcpy(fs->inode_bmaps[i],
1120 zero_buffer, fs->blksz);
1121 }
1122 fs->curr_inode_no =
1123 _get_new_inode_no(fs->inode_bmaps[i]);
1124 if (fs->curr_inode_no == -1)
1125 /* inode bitmap is completely filled */
1126 continue;
1127 fs->curr_inode_no = fs->curr_inode_no +
1128 (i * inodes_per_grp);
1129 fs->first_pass_ibmap++;
1130 ext4fs_bg_free_inodes_dec(bgd, fs);
1131 if (has_gdt_chksum)
1132 ext4fs_bg_itable_unused_dec(bgd, fs);
1133 ext4fs_sb_free_inodes_dec(fs->sb);
1134 status = ext4fs_devread(i_bitmap_blk *
1135 fs->sect_perblk,
1136 0, fs->blksz,
1137 journal_buffer);
1138 if (status == 0)
1139 goto fail;
1140 if (ext4fs_log_journal(journal_buffer,
1141 i_bitmap_blk))
1142 goto fail;
1143 goto success;
1144 } else
1145 debug("no inode left on block group %d\n", i);
1146 }
1147 goto fail;
1148 } else {
1149 restart:
1150 fs->curr_inode_no++;
1151 /* get the blockbitmap index respective to blockno */
1152 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1153 struct ext2_block_group *bgd =
1154 ext4fs_get_group_descriptor(fs, ibmap_idx);
1155 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1156 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1157
1158 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1159 put_ext4(i_bitmap_blk * fs->blksz,
1160 zero_buffer, fs->blksz);
1161 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1162 ext4fs_bg_set_flags(bgd, bg_flags);
1163 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1164 fs->blksz);
1165 }
1166
1167 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1168 fs->inode_bmaps[ibmap_idx],
1169 ibmap_idx) != 0) {
1170 debug("going for restart for the block no %d %u\n",
1171 fs->curr_inode_no, ibmap_idx);
1172 goto restart;
1173 }
1174
1175 /* journal backup */
1176 if (prev_inode_bitmap_index != ibmap_idx) {
1177 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1178 0, fs->blksz, journal_buffer);
1179 if (status == 0)
1180 goto fail;
1181 if (ext4fs_log_journal(journal_buffer,
1182 le32_to_cpu(bgd->inode_id)))
1183 goto fail;
1184 prev_inode_bitmap_index = ibmap_idx;
1185 }
1186 ext4fs_bg_free_inodes_dec(bgd, fs);
1187 if (has_gdt_chksum)
1188 bgd->bg_itable_unused = bgd->free_inodes;
1189 ext4fs_sb_free_inodes_dec(fs->sb);
1190 goto success;
1191 }
1192
1193 success:
1194 free(journal_buffer);
1195 free(zero_buffer);
1196
1197 return fs->curr_inode_no;
1198 fail:
1199 free(journal_buffer);
1200 free(zero_buffer);
1201
1202 return -1;
1203
1204 }
1205
1206
1207 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1208 unsigned int *total_remaining_blocks,
1209 unsigned int *no_blks_reqd)
1210 {
1211 short i;
1212 short status;
1213 long int actual_block_no;
1214 long int si_blockno;
1215 /* si :single indirect */
1216 __le32 *si_buffer = NULL;
1217 __le32 *si_start_addr = NULL;
1218 struct ext_filesystem *fs = get_fs();
1219
1220 if (*total_remaining_blocks != 0) {
1221 si_buffer = zalloc(fs->blksz);
1222 if (!si_buffer) {
1223 printf("No Memory\n");
1224 return;
1225 }
1226 si_start_addr = si_buffer;
1227 si_blockno = ext4fs_get_new_blk_no();
1228 if (si_blockno == -1) {
1229 printf("no block left to assign\n");
1230 goto fail;
1231 }
1232 (*no_blks_reqd)++;
1233 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1234
1235 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1236 0, fs->blksz, (char *)si_buffer);
1237 memset(si_buffer, '\0', fs->blksz);
1238 if (status == 0)
1239 goto fail;
1240
1241 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1242 actual_block_no = ext4fs_get_new_blk_no();
1243 if (actual_block_no == -1) {
1244 printf("no block left to assign\n");
1245 goto fail;
1246 }
1247 *si_buffer = cpu_to_le32(actual_block_no);
1248 debug("SIAB %u: %u\n", *si_buffer,
1249 *total_remaining_blocks);
1250
1251 si_buffer++;
1252 (*total_remaining_blocks)--;
1253 if (*total_remaining_blocks == 0)
1254 break;
1255 }
1256
1257 /* write the block to disk */
1258 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1259 si_start_addr, fs->blksz);
1260 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1261 }
1262 fail:
1263 free(si_start_addr);
1264 }
1265
1266 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1267 unsigned int *total_remaining_blocks,
1268 unsigned int *no_blks_reqd)
1269 {
1270 short i;
1271 short j;
1272 short status;
1273 long int actual_block_no;
1274 /* di:double indirect */
1275 long int di_blockno_parent;
1276 long int di_blockno_child;
1277 __le32 *di_parent_buffer = NULL;
1278 __le32 *di_child_buff = NULL;
1279 __le32 *di_block_start_addr = NULL;
1280 __le32 *di_child_buff_start = NULL;
1281 struct ext_filesystem *fs = get_fs();
1282
1283 if (*total_remaining_blocks != 0) {
1284 /* double indirect parent block connecting to inode */
1285 di_blockno_parent = ext4fs_get_new_blk_no();
1286 if (di_blockno_parent == -1) {
1287 printf("no block left to assign\n");
1288 goto fail;
1289 }
1290 di_parent_buffer = zalloc(fs->blksz);
1291 if (!di_parent_buffer)
1292 goto fail;
1293
1294 di_block_start_addr = di_parent_buffer;
1295 (*no_blks_reqd)++;
1296 debug("DIPB %ld: %u\n", di_blockno_parent,
1297 *total_remaining_blocks);
1298
1299 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1300 fs->sect_perblk, 0,
1301 fs->blksz, (char *)di_parent_buffer);
1302
1303 if (!status) {
1304 printf("%s: Device read error!\n", __func__);
1305 goto fail;
1306 }
1307 memset(di_parent_buffer, '\0', fs->blksz);
1308
1309 /*
1310 * start:for each double indirect parent
1311 * block create one more block
1312 */
1313 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1314 di_blockno_child = ext4fs_get_new_blk_no();
1315 if (di_blockno_child == -1) {
1316 printf("no block left to assign\n");
1317 goto fail;
1318 }
1319 di_child_buff = zalloc(fs->blksz);
1320 if (!di_child_buff)
1321 goto fail;
1322
1323 di_child_buff_start = di_child_buff;
1324 *di_parent_buffer = cpu_to_le32(di_blockno_child);
1325 di_parent_buffer++;
1326 (*no_blks_reqd)++;
1327 debug("DICB %ld: %u\n", di_blockno_child,
1328 *total_remaining_blocks);
1329
1330 status = ext4fs_devread((lbaint_t)di_blockno_child *
1331 fs->sect_perblk, 0,
1332 fs->blksz,
1333 (char *)di_child_buff);
1334
1335 if (!status) {
1336 printf("%s: Device read error!\n", __func__);
1337 goto fail;
1338 }
1339 memset(di_child_buff, '\0', fs->blksz);
1340 /* filling of actual datablocks for each child */
1341 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1342 actual_block_no = ext4fs_get_new_blk_no();
1343 if (actual_block_no == -1) {
1344 printf("no block left to assign\n");
1345 goto fail;
1346 }
1347 *di_child_buff = cpu_to_le32(actual_block_no);
1348 debug("DIAB %ld: %u\n", actual_block_no,
1349 *total_remaining_blocks);
1350
1351 di_child_buff++;
1352 (*total_remaining_blocks)--;
1353 if (*total_remaining_blocks == 0)
1354 break;
1355 }
1356 /* write the block table */
1357 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1358 di_child_buff_start, fs->blksz);
1359 free(di_child_buff_start);
1360 di_child_buff_start = NULL;
1361
1362 if (*total_remaining_blocks == 0)
1363 break;
1364 }
1365 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1366 di_block_start_addr, fs->blksz);
1367 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1368 }
1369 fail:
1370 free(di_block_start_addr);
1371 }
1372
1373 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1374 unsigned int *total_remaining_blocks,
1375 unsigned int *no_blks_reqd)
1376 {
1377 short i;
1378 short j;
1379 short k;
1380 long int actual_block_no;
1381 /* ti: Triple Indirect */
1382 long int ti_gp_blockno;
1383 long int ti_parent_blockno;
1384 long int ti_child_blockno;
1385 __le32 *ti_gp_buff = NULL;
1386 __le32 *ti_parent_buff = NULL;
1387 __le32 *ti_child_buff = NULL;
1388 __le32 *ti_gp_buff_start_addr = NULL;
1389 __le32 *ti_pbuff_start_addr = NULL;
1390 __le32 *ti_cbuff_start_addr = NULL;
1391 struct ext_filesystem *fs = get_fs();
1392 if (*total_remaining_blocks != 0) {
1393 /* triple indirect grand parent block connecting to inode */
1394 ti_gp_blockno = ext4fs_get_new_blk_no();
1395 if (ti_gp_blockno == -1) {
1396 printf("no block left to assign\n");
1397 return;
1398 }
1399 ti_gp_buff = zalloc(fs->blksz);
1400 if (!ti_gp_buff)
1401 return;
1402
1403 ti_gp_buff_start_addr = ti_gp_buff;
1404 (*no_blks_reqd)++;
1405 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1406 *total_remaining_blocks);
1407
1408 /* for each 4 byte grand parent entry create one more block */
1409 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1410 ti_parent_blockno = ext4fs_get_new_blk_no();
1411 if (ti_parent_blockno == -1) {
1412 printf("no block left to assign\n");
1413 goto fail;
1414 }
1415 ti_parent_buff = zalloc(fs->blksz);
1416 if (!ti_parent_buff)
1417 goto fail;
1418
1419 ti_pbuff_start_addr = ti_parent_buff;
1420 *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1421 ti_gp_buff++;
1422 (*no_blks_reqd)++;
1423 debug("TIPB %ld: %u\n", ti_parent_blockno,
1424 *total_remaining_blocks);
1425
1426 /* for each 4 byte entry parent create one more block */
1427 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1428 ti_child_blockno = ext4fs_get_new_blk_no();
1429 if (ti_child_blockno == -1) {
1430 printf("no block left assign\n");
1431 goto fail1;
1432 }
1433 ti_child_buff = zalloc(fs->blksz);
1434 if (!ti_child_buff)
1435 goto fail1;
1436
1437 ti_cbuff_start_addr = ti_child_buff;
1438 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1439 ti_parent_buff++;
1440 (*no_blks_reqd)++;
1441 debug("TICB %ld: %u\n", ti_parent_blockno,
1442 *total_remaining_blocks);
1443
1444 /* fill actual datablocks for each child */
1445 for (k = 0; k < (fs->blksz / sizeof(int));
1446 k++) {
1447 actual_block_no =
1448 ext4fs_get_new_blk_no();
1449 if (actual_block_no == -1) {
1450 printf("no block left\n");
1451 free(ti_cbuff_start_addr);
1452 goto fail1;
1453 }
1454 *ti_child_buff = cpu_to_le32(actual_block_no);
1455 debug("TIAB %ld: %u\n", actual_block_no,
1456 *total_remaining_blocks);
1457
1458 ti_child_buff++;
1459 (*total_remaining_blocks)--;
1460 if (*total_remaining_blocks == 0)
1461 break;
1462 }
1463 /* write the child block */
1464 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1465 (uint64_t)fs->blksz)),
1466 ti_cbuff_start_addr, fs->blksz);
1467 free(ti_cbuff_start_addr);
1468
1469 if (*total_remaining_blocks == 0)
1470 break;
1471 }
1472 /* write the parent block */
1473 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1474 ti_pbuff_start_addr, fs->blksz);
1475 free(ti_pbuff_start_addr);
1476
1477 if (*total_remaining_blocks == 0)
1478 break;
1479 }
1480 /* write the grand parent block */
1481 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1482 ti_gp_buff_start_addr, fs->blksz);
1483 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1484 free(ti_gp_buff_start_addr);
1485 return;
1486 }
1487 fail1:
1488 free(ti_pbuff_start_addr);
1489 fail:
1490 free(ti_gp_buff_start_addr);
1491 }
1492
1493 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1494 unsigned int total_remaining_blocks,
1495 unsigned int *total_no_of_block)
1496 {
1497 short i;
1498 long int direct_blockno;
1499 unsigned int no_blks_reqd = 0;
1500
1501 /* allocation of direct blocks */
1502 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1503 direct_blockno = ext4fs_get_new_blk_no();
1504 if (direct_blockno == -1) {
1505 printf("no block left to assign\n");
1506 return;
1507 }
1508 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1509 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1510
1511 total_remaining_blocks--;
1512 }
1513
1514 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1515 &no_blks_reqd);
1516 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1517 &no_blks_reqd);
1518 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1519 &no_blks_reqd);
1520 *total_no_of_block += no_blks_reqd;
1521 }
1522
1523 #endif
1524
1525 static struct ext4_extent_header *ext4fs_get_extent_block
1526 (struct ext2_data *data, struct ext_block_cache *cache,
1527 struct ext4_extent_header *ext_block,
1528 uint32_t fileblock, int log2_blksz)
1529 {
1530 struct ext4_extent_idx *index;
1531 unsigned long long block;
1532 int blksz = EXT2_BLOCK_SIZE(data);
1533 int i;
1534
1535 while (1) {
1536 index = (struct ext4_extent_idx *)(ext_block + 1);
1537
1538 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1539 return NULL;
1540
1541 if (ext_block->eh_depth == 0)
1542 return ext_block;
1543 i = -1;
1544 do {
1545 i++;
1546 if (i >= le16_to_cpu(ext_block->eh_entries))
1547 break;
1548 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1549
1550 if (--i < 0)
1551 return NULL;
1552
1553 block = le16_to_cpu(index[i].ei_leaf_hi);
1554 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1555 block <<= log2_blksz;
1556 if (!ext_cache_read(cache, (lbaint_t)block, blksz))
1557 return NULL;
1558 ext_block = (struct ext4_extent_header *)cache->buf;
1559 }
1560 }
1561
1562 static int ext4fs_blockgroup
1563 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1564 {
1565 long int blkno;
1566 unsigned int blkoff, desc_per_blk;
1567 int log2blksz = get_fs()->dev_desc->log2blksz;
1568 int desc_size = get_fs()->gdsize;
1569
1570 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1571
1572 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1573 group / desc_per_blk;
1574 blkoff = (group % desc_per_blk) * desc_size;
1575
1576 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1577 group, blkno, blkoff);
1578
1579 return ext4fs_devread((lbaint_t)blkno <<
1580 (LOG2_BLOCK_SIZE(data) - log2blksz),
1581 blkoff, desc_size, (char *)blkgrp);
1582 }
1583
1584 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1585 {
1586 struct ext2_block_group blkgrp;
1587 struct ext2_sblock *sblock = &data->sblock;
1588 struct ext_filesystem *fs = get_fs();
1589 int log2blksz = get_fs()->dev_desc->log2blksz;
1590 int inodes_per_block, status;
1591 long int blkno;
1592 unsigned int blkoff;
1593
1594 /* It is easier to calculate if the first inode is 0. */
1595 ino--;
1596 status = ext4fs_blockgroup(data, ino / le32_to_cpu
1597 (sblock->inodes_per_group), &blkgrp);
1598 if (status == 0)
1599 return 0;
1600
1601 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1602 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
1603 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1604 blkoff = (ino % inodes_per_block) * fs->inodesz;
1605 /* Read the inode. */
1606 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1607 log2blksz), blkoff,
1608 sizeof(struct ext2_inode), (char *)inode);
1609 if (status == 0)
1610 return 0;
1611
1612 return 1;
1613 }
1614
1615 long int read_allocated_block(struct ext2_inode *inode, int fileblock,
1616 struct ext_block_cache *cache)
1617 {
1618 long int blknr;
1619 int blksz;
1620 int log2_blksz;
1621 int status;
1622 long int rblock;
1623 long int perblock_parent;
1624 long int perblock_child;
1625 unsigned long long start;
1626 /* get the blocksize of the filesystem */
1627 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1628 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1629 - get_fs()->dev_desc->log2blksz;
1630
1631 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1632 long int startblock, endblock;
1633 struct ext_block_cache *c, cd;
1634 struct ext4_extent_header *ext_block;
1635 struct ext4_extent *extent;
1636 int i;
1637
1638 if (cache) {
1639 c = cache;
1640 } else {
1641 c = &cd;
1642 ext_cache_init(c);
1643 }
1644 ext_block =
1645 ext4fs_get_extent_block(ext4fs_root, c,
1646 (struct ext4_extent_header *)
1647 inode->b.blocks.dir_blocks,
1648 fileblock, log2_blksz);
1649 if (!ext_block) {
1650 printf("invalid extent block\n");
1651 if (!cache)
1652 ext_cache_fini(c);
1653 return -EINVAL;
1654 }
1655
1656 extent = (struct ext4_extent *)(ext_block + 1);
1657
1658 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1659 startblock = le32_to_cpu(extent[i].ee_block);
1660 endblock = startblock + le16_to_cpu(extent[i].ee_len);
1661
1662 if (startblock > fileblock) {
1663 /* Sparse file */
1664 if (!cache)
1665 ext_cache_fini(c);
1666 return 0;
1667
1668 } else if (fileblock < endblock) {
1669 start = le16_to_cpu(extent[i].ee_start_hi);
1670 start = (start << 32) +
1671 le32_to_cpu(extent[i].ee_start_lo);
1672 if (!cache)
1673 ext_cache_fini(c);
1674 return (fileblock - startblock) + start;
1675 }
1676 }
1677
1678 if (!cache)
1679 ext_cache_fini(c);
1680 return 0;
1681 }
1682
1683 /* Direct blocks. */
1684 if (fileblock < INDIRECT_BLOCKS)
1685 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1686
1687 /* Indirect. */
1688 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1689 if (ext4fs_indir1_block == NULL) {
1690 ext4fs_indir1_block = zalloc(blksz);
1691 if (ext4fs_indir1_block == NULL) {
1692 printf("** SI ext2fs read block (indir 1)"
1693 "malloc failed. **\n");
1694 return -1;
1695 }
1696 ext4fs_indir1_size = blksz;
1697 ext4fs_indir1_blkno = -1;
1698 }
1699 if (blksz != ext4fs_indir1_size) {
1700 free(ext4fs_indir1_block);
1701 ext4fs_indir1_block = NULL;
1702 ext4fs_indir1_size = 0;
1703 ext4fs_indir1_blkno = -1;
1704 ext4fs_indir1_block = zalloc(blksz);
1705 if (ext4fs_indir1_block == NULL) {
1706 printf("** SI ext2fs read block (indir 1):"
1707 "malloc failed. **\n");
1708 return -1;
1709 }
1710 ext4fs_indir1_size = blksz;
1711 }
1712 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1713 log2_blksz) != ext4fs_indir1_blkno) {
1714 status =
1715 ext4fs_devread((lbaint_t)le32_to_cpu
1716 (inode->b.blocks.
1717 indir_block) << log2_blksz, 0,
1718 blksz, (char *)ext4fs_indir1_block);
1719 if (status == 0) {
1720 printf("** SI ext2fs read block (indir 1)"
1721 "failed. **\n");
1722 return -1;
1723 }
1724 ext4fs_indir1_blkno =
1725 le32_to_cpu(inode->b.blocks.
1726 indir_block) << log2_blksz;
1727 }
1728 blknr = le32_to_cpu(ext4fs_indir1_block
1729 [fileblock - INDIRECT_BLOCKS]);
1730 }
1731 /* Double indirect. */
1732 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1733 (blksz / 4 + 1)))) {
1734
1735 long int perblock = blksz / 4;
1736 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1737
1738 if (ext4fs_indir1_block == NULL) {
1739 ext4fs_indir1_block = zalloc(blksz);
1740 if (ext4fs_indir1_block == NULL) {
1741 printf("** DI ext2fs read block (indir 2 1)"
1742 "malloc failed. **\n");
1743 return -1;
1744 }
1745 ext4fs_indir1_size = blksz;
1746 ext4fs_indir1_blkno = -1;
1747 }
1748 if (blksz != ext4fs_indir1_size) {
1749 free(ext4fs_indir1_block);
1750 ext4fs_indir1_block = NULL;
1751 ext4fs_indir1_size = 0;
1752 ext4fs_indir1_blkno = -1;
1753 ext4fs_indir1_block = zalloc(blksz);
1754 if (ext4fs_indir1_block == NULL) {
1755 printf("** DI ext2fs read block (indir 2 1)"
1756 "malloc failed. **\n");
1757 return -1;
1758 }
1759 ext4fs_indir1_size = blksz;
1760 }
1761 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1762 log2_blksz) != ext4fs_indir1_blkno) {
1763 status =
1764 ext4fs_devread((lbaint_t)le32_to_cpu
1765 (inode->b.blocks.
1766 double_indir_block) << log2_blksz,
1767 0, blksz,
1768 (char *)ext4fs_indir1_block);
1769 if (status == 0) {
1770 printf("** DI ext2fs read block (indir 2 1)"
1771 "failed. **\n");
1772 return -1;
1773 }
1774 ext4fs_indir1_blkno =
1775 le32_to_cpu(inode->b.blocks.double_indir_block) <<
1776 log2_blksz;
1777 }
1778
1779 if (ext4fs_indir2_block == NULL) {
1780 ext4fs_indir2_block = zalloc(blksz);
1781 if (ext4fs_indir2_block == NULL) {
1782 printf("** DI ext2fs read block (indir 2 2)"
1783 "malloc failed. **\n");
1784 return -1;
1785 }
1786 ext4fs_indir2_size = blksz;
1787 ext4fs_indir2_blkno = -1;
1788 }
1789 if (blksz != ext4fs_indir2_size) {
1790 free(ext4fs_indir2_block);
1791 ext4fs_indir2_block = NULL;
1792 ext4fs_indir2_size = 0;
1793 ext4fs_indir2_blkno = -1;
1794 ext4fs_indir2_block = zalloc(blksz);
1795 if (ext4fs_indir2_block == NULL) {
1796 printf("** DI ext2fs read block (indir 2 2)"
1797 "malloc failed. **\n");
1798 return -1;
1799 }
1800 ext4fs_indir2_size = blksz;
1801 }
1802 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1803 log2_blksz) != ext4fs_indir2_blkno) {
1804 status = ext4fs_devread((lbaint_t)le32_to_cpu
1805 (ext4fs_indir1_block
1806 [rblock /
1807 perblock]) << log2_blksz, 0,
1808 blksz,
1809 (char *)ext4fs_indir2_block);
1810 if (status == 0) {
1811 printf("** DI ext2fs read block (indir 2 2)"
1812 "failed. **\n");
1813 return -1;
1814 }
1815 ext4fs_indir2_blkno =
1816 le32_to_cpu(ext4fs_indir1_block[rblock
1817 /
1818 perblock]) <<
1819 log2_blksz;
1820 }
1821 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1822 }
1823 /* Tripple indirect. */
1824 else {
1825 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1826 (blksz / 4 * blksz / 4));
1827 perblock_child = blksz / 4;
1828 perblock_parent = ((blksz / 4) * (blksz / 4));
1829
1830 if (ext4fs_indir1_block == NULL) {
1831 ext4fs_indir1_block = zalloc(blksz);
1832 if (ext4fs_indir1_block == NULL) {
1833 printf("** TI ext2fs read block (indir 2 1)"
1834 "malloc failed. **\n");
1835 return -1;
1836 }
1837 ext4fs_indir1_size = blksz;
1838 ext4fs_indir1_blkno = -1;
1839 }
1840 if (blksz != ext4fs_indir1_size) {
1841 free(ext4fs_indir1_block);
1842 ext4fs_indir1_block = NULL;
1843 ext4fs_indir1_size = 0;
1844 ext4fs_indir1_blkno = -1;
1845 ext4fs_indir1_block = zalloc(blksz);
1846 if (ext4fs_indir1_block == NULL) {
1847 printf("** TI ext2fs read block (indir 2 1)"
1848 "malloc failed. **\n");
1849 return -1;
1850 }
1851 ext4fs_indir1_size = blksz;
1852 }
1853 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1854 log2_blksz) != ext4fs_indir1_blkno) {
1855 status = ext4fs_devread
1856 ((lbaint_t)
1857 le32_to_cpu(inode->b.blocks.triple_indir_block)
1858 << log2_blksz, 0, blksz,
1859 (char *)ext4fs_indir1_block);
1860 if (status == 0) {
1861 printf("** TI ext2fs read block (indir 2 1)"
1862 "failed. **\n");
1863 return -1;
1864 }
1865 ext4fs_indir1_blkno =
1866 le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1867 log2_blksz;
1868 }
1869
1870 if (ext4fs_indir2_block == NULL) {
1871 ext4fs_indir2_block = zalloc(blksz);
1872 if (ext4fs_indir2_block == NULL) {
1873 printf("** TI ext2fs read block (indir 2 2)"
1874 "malloc failed. **\n");
1875 return -1;
1876 }
1877 ext4fs_indir2_size = blksz;
1878 ext4fs_indir2_blkno = -1;
1879 }
1880 if (blksz != ext4fs_indir2_size) {
1881 free(ext4fs_indir2_block);
1882 ext4fs_indir2_block = NULL;
1883 ext4fs_indir2_size = 0;
1884 ext4fs_indir2_blkno = -1;
1885 ext4fs_indir2_block = zalloc(blksz);
1886 if (ext4fs_indir2_block == NULL) {
1887 printf("** TI ext2fs read block (indir 2 2)"
1888 "malloc failed. **\n");
1889 return -1;
1890 }
1891 ext4fs_indir2_size = blksz;
1892 }
1893 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1894 perblock_parent]) <<
1895 log2_blksz)
1896 != ext4fs_indir2_blkno) {
1897 status = ext4fs_devread((lbaint_t)le32_to_cpu
1898 (ext4fs_indir1_block
1899 [rblock /
1900 perblock_parent]) <<
1901 log2_blksz, 0, blksz,
1902 (char *)ext4fs_indir2_block);
1903 if (status == 0) {
1904 printf("** TI ext2fs read block (indir 2 2)"
1905 "failed. **\n");
1906 return -1;
1907 }
1908 ext4fs_indir2_blkno =
1909 le32_to_cpu(ext4fs_indir1_block[rblock /
1910 perblock_parent])
1911 << log2_blksz;
1912 }
1913
1914 if (ext4fs_indir3_block == NULL) {
1915 ext4fs_indir3_block = zalloc(blksz);
1916 if (ext4fs_indir3_block == NULL) {
1917 printf("** TI ext2fs read block (indir 2 2)"
1918 "malloc failed. **\n");
1919 return -1;
1920 }
1921 ext4fs_indir3_size = blksz;
1922 ext4fs_indir3_blkno = -1;
1923 }
1924 if (blksz != ext4fs_indir3_size) {
1925 free(ext4fs_indir3_block);
1926 ext4fs_indir3_block = NULL;
1927 ext4fs_indir3_size = 0;
1928 ext4fs_indir3_blkno = -1;
1929 ext4fs_indir3_block = zalloc(blksz);
1930 if (ext4fs_indir3_block == NULL) {
1931 printf("** TI ext2fs read block (indir 2 2)"
1932 "malloc failed. **\n");
1933 return -1;
1934 }
1935 ext4fs_indir3_size = blksz;
1936 }
1937 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1938 /
1939 perblock_child]) <<
1940 log2_blksz) != ext4fs_indir3_blkno) {
1941 status =
1942 ext4fs_devread((lbaint_t)le32_to_cpu
1943 (ext4fs_indir2_block
1944 [(rblock / perblock_child)
1945 % (blksz / 4)]) << log2_blksz, 0,
1946 blksz, (char *)ext4fs_indir3_block);
1947 if (status == 0) {
1948 printf("** TI ext2fs read block (indir 2 2)"
1949 "failed. **\n");
1950 return -1;
1951 }
1952 ext4fs_indir3_blkno =
1953 le32_to_cpu(ext4fs_indir2_block[(rblock /
1954 perblock_child) %
1955 (blksz /
1956 4)]) <<
1957 log2_blksz;
1958 }
1959
1960 blknr = le32_to_cpu(ext4fs_indir3_block
1961 [rblock % perblock_child]);
1962 }
1963 debug("read_allocated_block %ld\n", blknr);
1964
1965 return blknr;
1966 }
1967
1968 /**
1969 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1970 * global pointers
1971 *
1972 * This function assures that for a file with the same name but different size
1973 * the sequential store on the ext4 filesystem will be correct.
1974 *
1975 * In this function the global data, responsible for internal representation
1976 * of the ext4 data are initialized to the reset state. Without this, during
1977 * replacement of the smaller file with the bigger truncation of new file was
1978 * performed.
1979 */
1980 void ext4fs_reinit_global(void)
1981 {
1982 if (ext4fs_indir1_block != NULL) {
1983 free(ext4fs_indir1_block);
1984 ext4fs_indir1_block = NULL;
1985 ext4fs_indir1_size = 0;
1986 ext4fs_indir1_blkno = -1;
1987 }
1988 if (ext4fs_indir2_block != NULL) {
1989 free(ext4fs_indir2_block);
1990 ext4fs_indir2_block = NULL;
1991 ext4fs_indir2_size = 0;
1992 ext4fs_indir2_blkno = -1;
1993 }
1994 if (ext4fs_indir3_block != NULL) {
1995 free(ext4fs_indir3_block);
1996 ext4fs_indir3_block = NULL;
1997 ext4fs_indir3_size = 0;
1998 ext4fs_indir3_blkno = -1;
1999 }
2000 }
2001 void ext4fs_close(void)
2002 {
2003 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
2004 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
2005 ext4fs_file = NULL;
2006 }
2007 if (ext4fs_root != NULL) {
2008 free(ext4fs_root);
2009 ext4fs_root = NULL;
2010 }
2011
2012 ext4fs_reinit_global();
2013 }
2014
2015 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2016 struct ext2fs_node **fnode, int *ftype)
2017 {
2018 unsigned int fpos = 0;
2019 int status;
2020 loff_t actread;
2021 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2022
2023 #ifdef DEBUG
2024 if (name != NULL)
2025 printf("Iterate dir %s\n", name);
2026 #endif /* of DEBUG */
2027 if (!diro->inode_read) {
2028 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2029 if (status == 0)
2030 return 0;
2031 }
2032 /* Search the file. */
2033 while (fpos < le32_to_cpu(diro->inode.size)) {
2034 struct ext2_dirent dirent;
2035
2036 status = ext4fs_read_file(diro, fpos,
2037 sizeof(struct ext2_dirent),
2038 (char *)&dirent, &actread);
2039 if (status < 0)
2040 return 0;
2041
2042 if (dirent.direntlen == 0) {
2043 printf("Failed to iterate over directory %s\n", name);
2044 return 0;
2045 }
2046
2047 if (dirent.namelen != 0) {
2048 char filename[dirent.namelen + 1];
2049 struct ext2fs_node *fdiro;
2050 int type = FILETYPE_UNKNOWN;
2051
2052 status = ext4fs_read_file(diro,
2053 fpos +
2054 sizeof(struct ext2_dirent),
2055 dirent.namelen, filename,
2056 &actread);
2057 if (status < 0)
2058 return 0;
2059
2060 fdiro = zalloc(sizeof(struct ext2fs_node));
2061 if (!fdiro)
2062 return 0;
2063
2064 fdiro->data = diro->data;
2065 fdiro->ino = le32_to_cpu(dirent.inode);
2066
2067 filename[dirent.namelen] = '\0';
2068
2069 if (dirent.filetype != FILETYPE_UNKNOWN) {
2070 fdiro->inode_read = 0;
2071
2072 if (dirent.filetype == FILETYPE_DIRECTORY)
2073 type = FILETYPE_DIRECTORY;
2074 else if (dirent.filetype == FILETYPE_SYMLINK)
2075 type = FILETYPE_SYMLINK;
2076 else if (dirent.filetype == FILETYPE_REG)
2077 type = FILETYPE_REG;
2078 } else {
2079 status = ext4fs_read_inode(diro->data,
2080 le32_to_cpu
2081 (dirent.inode),
2082 &fdiro->inode);
2083 if (status == 0) {
2084 free(fdiro);
2085 return 0;
2086 }
2087 fdiro->inode_read = 1;
2088
2089 if ((le16_to_cpu(fdiro->inode.mode) &
2090 FILETYPE_INO_MASK) ==
2091 FILETYPE_INO_DIRECTORY) {
2092 type = FILETYPE_DIRECTORY;
2093 } else if ((le16_to_cpu(fdiro->inode.mode)
2094 & FILETYPE_INO_MASK) ==
2095 FILETYPE_INO_SYMLINK) {
2096 type = FILETYPE_SYMLINK;
2097 } else if ((le16_to_cpu(fdiro->inode.mode)
2098 & FILETYPE_INO_MASK) ==
2099 FILETYPE_INO_REG) {
2100 type = FILETYPE_REG;
2101 }
2102 }
2103 #ifdef DEBUG
2104 printf("iterate >%s<\n", filename);
2105 #endif /* of DEBUG */
2106 if ((name != NULL) && (fnode != NULL)
2107 && (ftype != NULL)) {
2108 if (strcmp(filename, name) == 0) {
2109 *ftype = type;
2110 *fnode = fdiro;
2111 return 1;
2112 }
2113 } else {
2114 if (fdiro->inode_read == 0) {
2115 status = ext4fs_read_inode(diro->data,
2116 le32_to_cpu(
2117 dirent.inode),
2118 &fdiro->inode);
2119 if (status == 0) {
2120 free(fdiro);
2121 return 0;
2122 }
2123 fdiro->inode_read = 1;
2124 }
2125 switch (type) {
2126 case FILETYPE_DIRECTORY:
2127 printf("<DIR> ");
2128 break;
2129 case FILETYPE_SYMLINK:
2130 printf("<SYM> ");
2131 break;
2132 case FILETYPE_REG:
2133 printf(" ");
2134 break;
2135 default:
2136 printf("< ? > ");
2137 break;
2138 }
2139 printf("%10u %s\n",
2140 le32_to_cpu(fdiro->inode.size),
2141 filename);
2142 }
2143 free(fdiro);
2144 }
2145 fpos += le16_to_cpu(dirent.direntlen);
2146 }
2147 return 0;
2148 }
2149
2150 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2151 {
2152 char *symlink;
2153 struct ext2fs_node *diro = node;
2154 int status;
2155 loff_t actread;
2156
2157 if (!diro->inode_read) {
2158 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2159 if (status == 0)
2160 return NULL;
2161 }
2162 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2163 if (!symlink)
2164 return NULL;
2165
2166 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2167 strncpy(symlink, diro->inode.b.symlink,
2168 le32_to_cpu(diro->inode.size));
2169 } else {
2170 status = ext4fs_read_file(diro, 0,
2171 le32_to_cpu(diro->inode.size),
2172 symlink, &actread);
2173 if ((status < 0) || (actread == 0)) {
2174 free(symlink);
2175 return NULL;
2176 }
2177 }
2178 symlink[le32_to_cpu(diro->inode.size)] = '\0';
2179 return symlink;
2180 }
2181
2182 static int ext4fs_find_file1(const char *currpath,
2183 struct ext2fs_node *currroot,
2184 struct ext2fs_node **currfound, int *foundtype)
2185 {
2186 char fpath[strlen(currpath) + 1];
2187 char *name = fpath;
2188 char *next;
2189 int status;
2190 int type = FILETYPE_DIRECTORY;
2191 struct ext2fs_node *currnode = currroot;
2192 struct ext2fs_node *oldnode = currroot;
2193
2194 strncpy(fpath, currpath, strlen(currpath) + 1);
2195
2196 /* Remove all leading slashes. */
2197 while (*name == '/')
2198 name++;
2199
2200 if (!*name) {
2201 *currfound = currnode;
2202 return 1;
2203 }
2204
2205 for (;;) {
2206 int found;
2207
2208 /* Extract the actual part from the pathname. */
2209 next = strchr(name, '/');
2210 if (next) {
2211 /* Remove all leading slashes. */
2212 while (*next == '/')
2213 *(next++) = '\0';
2214 }
2215
2216 if (type != FILETYPE_DIRECTORY) {
2217 ext4fs_free_node(currnode, currroot);
2218 return 0;
2219 }
2220
2221 oldnode = currnode;
2222
2223 /* Iterate over the directory. */
2224 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2225 if (found == 0)
2226 return 0;
2227
2228 if (found == -1)
2229 break;
2230
2231 /* Read in the symlink and follow it. */
2232 if (type == FILETYPE_SYMLINK) {
2233 char *symlink;
2234
2235 /* Test if the symlink does not loop. */
2236 if (++symlinknest == 8) {
2237 ext4fs_free_node(currnode, currroot);
2238 ext4fs_free_node(oldnode, currroot);
2239 return 0;
2240 }
2241
2242 symlink = ext4fs_read_symlink(currnode);
2243 ext4fs_free_node(currnode, currroot);
2244
2245 if (!symlink) {
2246 ext4fs_free_node(oldnode, currroot);
2247 return 0;
2248 }
2249
2250 debug("Got symlink >%s<\n", symlink);
2251
2252 if (symlink[0] == '/') {
2253 ext4fs_free_node(oldnode, currroot);
2254 oldnode = &ext4fs_root->diropen;
2255 }
2256
2257 /* Lookup the node the symlink points to. */
2258 status = ext4fs_find_file1(symlink, oldnode,
2259 &currnode, &type);
2260
2261 free(symlink);
2262
2263 if (status == 0) {
2264 ext4fs_free_node(oldnode, currroot);
2265 return 0;
2266 }
2267 }
2268
2269 ext4fs_free_node(oldnode, currroot);
2270
2271 /* Found the node! */
2272 if (!next || *next == '\0') {
2273 *currfound = currnode;
2274 *foundtype = type;
2275 return 1;
2276 }
2277 name = next;
2278 }
2279 return -1;
2280 }
2281
2282 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2283 struct ext2fs_node **foundnode, int expecttype)
2284 {
2285 int status;
2286 int foundtype = FILETYPE_DIRECTORY;
2287
2288 symlinknest = 0;
2289 if (!path)
2290 return 0;
2291
2292 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2293 if (status == 0)
2294 return 0;
2295
2296 /* Check if the node that was found was of the expected type. */
2297 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2298 return 0;
2299 else if ((expecttype == FILETYPE_DIRECTORY)
2300 && (foundtype != expecttype))
2301 return 0;
2302
2303 return 1;
2304 }
2305
2306 int ext4fs_open(const char *filename, loff_t *len)
2307 {
2308 struct ext2fs_node *fdiro = NULL;
2309 int status;
2310
2311 if (ext4fs_root == NULL)
2312 return -1;
2313
2314 ext4fs_file = NULL;
2315 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2316 FILETYPE_REG);
2317 if (status == 0)
2318 goto fail;
2319
2320 if (!fdiro->inode_read) {
2321 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2322 &fdiro->inode);
2323 if (status == 0)
2324 goto fail;
2325 }
2326 *len = le32_to_cpu(fdiro->inode.size);
2327 ext4fs_file = fdiro;
2328
2329 return 0;
2330 fail:
2331 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2332
2333 return -1;
2334 }
2335
2336 int ext4fs_mount(unsigned part_length)
2337 {
2338 struct ext2_data *data;
2339 int status;
2340 struct ext_filesystem *fs = get_fs();
2341 data = zalloc(SUPERBLOCK_SIZE);
2342 if (!data)
2343 return 0;
2344
2345 /* Read the superblock. */
2346 status = ext4_read_superblock((char *)&data->sblock);
2347
2348 if (status == 0)
2349 goto fail;
2350
2351 /* Make sure this is an ext2 filesystem. */
2352 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2353 goto fail_noerr;
2354
2355
2356 if (le32_to_cpu(data->sblock.revision_level) == 0) {
2357 fs->inodesz = 128;
2358 fs->gdsize = 32;
2359 } else {
2360 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2361 __le32_to_cpu(data->sblock.feature_compatibility),
2362 __le32_to_cpu(data->sblock.feature_incompat),
2363 __le32_to_cpu(data->sblock.feature_ro_compat));
2364
2365 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2366 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2367 EXT4_FEATURE_INCOMPAT_64BIT ?
2368 le16_to_cpu(data->sblock.descriptor_size) : 32;
2369 }
2370
2371 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2372 le32_to_cpu(data->sblock.revision_level),
2373 fs->inodesz, fs->gdsize);
2374
2375 data->diropen.data = data;
2376 data->diropen.ino = 2;
2377 data->diropen.inode_read = 1;
2378 data->inode = &data->diropen.inode;
2379
2380 status = ext4fs_read_inode(data, 2, data->inode);
2381 if (status == 0)
2382 goto fail;
2383
2384 ext4fs_root = data;
2385
2386 return 1;
2387 fail:
2388 printf("Failed to mount ext2 filesystem...\n");
2389 fail_noerr:
2390 free(data);
2391 ext4fs_root = NULL;
2392
2393 return 0;
2394 }
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