]> git.ipfire.org Git - people/ms/u-boot.git/blob - fs/ext4/ext4_common.c
projects / people / ms / u-boot.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
ext4: cleanup unlink_filename function
[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 templength = 0;
858 int status, inodeno;
859 int found = 0;
860 int offset;
861 char *block_buffer = NULL;
862 struct ext2_dirent *dir = NULL;
863 struct ext2_dirent *previous_dir = NULL;
864 char *ptr = NULL;
865 struct ext_filesystem *fs = get_fs();
866 int ret = -1;
867
868 block_buffer = zalloc(fs->blksz);
869 if (!block_buffer)
870 return -ENOMEM;
871
872 /* read the directory block */
873 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
874 fs->blksz, block_buffer);
875 if (status == 0)
876 goto fail;
877
878 if (ext4fs_log_journal(block_buffer, blknr))
879 goto fail;
880 dir = (struct ext2_dirent *)block_buffer;
881 ptr = (char *)dir;
882 offset = 0;
883 while (le16_to_cpu(dir->direntlen) >= 0) {
884 /*
885 * blocksize-offset because last
886 * directory length i.e., *dir->direntlen
887 * is free availble space in the block that
888 * means it is a last entry of directory entry
889 */
890 if (dir->inode && (strlen(filename) == dir->namelen) &&
891 (strncmp(ptr + sizeof(struct ext2_dirent),
892 filename, dir->namelen) == 0)) {
893 printf("file found, deleting\n");
894 inodeno = le32_to_cpu(dir->inode);
895 if (previous_dir) {
896 uint16_t new_len;
897 new_len = le16_to_cpu(previous_dir->direntlen);
898 new_len += le16_to_cpu(dir->direntlen);
899 previous_dir->direntlen = cpu_to_le16(new_len);
900 } else {
901 dir->inode = 0;
902 }
903 found = 1;
904 break;
905 }
906
907 if (fs->blksz - offset == le16_to_cpu(dir->direntlen))
908 break;
909
910 /* traversing the each directory entry */
911 templength = le16_to_cpu(dir->direntlen);
912 offset = offset + templength;
913 previous_dir = dir;
914 dir = (struct ext2_dirent *)((char *)dir + templength);
915 ptr = (char *)dir;
916 }
917
918
919 if (found == 1) {
920 if (ext4fs_put_metadata(block_buffer, blknr))
921 goto fail;
922 ret = inodeno;
923 }
924 fail:
925 free(block_buffer);
926
927 return ret;
928 }
929
930 int ext4fs_filename_unlink(char *filename)
931 {
932 int blk_idx;
933 long int blknr = -1;
934 int inodeno = -1;
935 uint32_t directory_blocks;
936
937 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
938 LOG2_BLOCK_SIZE(ext4fs_root);
939
940 /* read the block no allocated to a file */
941 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
942 blknr = read_allocated_block(g_parent_inode, blk_idx);
943 if (blknr <= 0)
944 break;
945 inodeno = unlink_filename(filename, blknr);
946 if (inodeno != -1)
947 return inodeno;
948 }
949
950 return -1;
951 }
952
953 uint32_t ext4fs_get_new_blk_no(void)
954 {
955 short i;
956 short status;
957 int remainder;
958 unsigned int bg_idx;
959 static int prev_bg_bitmap_index = -1;
960 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
961 struct ext_filesystem *fs = get_fs();
962 char *journal_buffer = zalloc(fs->blksz);
963 char *zero_buffer = zalloc(fs->blksz);
964 if (!journal_buffer || !zero_buffer)
965 goto fail;
966
967 if (fs->first_pass_bbmap == 0) {
968 for (i = 0; i < fs->no_blkgrp; i++) {
969 struct ext2_block_group *bgd = NULL;
970 bgd = ext4fs_get_group_descriptor(fs, i);
971 if (ext4fs_bg_get_free_blocks(bgd, fs)) {
972 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
973 uint64_t b_bitmap_blk =
974 ext4fs_bg_get_block_id(bgd, fs);
975 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
976 memcpy(fs->blk_bmaps[i], zero_buffer,
977 fs->blksz);
978 put_ext4(b_bitmap_blk * fs->blksz,
979 fs->blk_bmaps[i], fs->blksz);
980 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
981 ext4fs_bg_set_flags(bgd, bg_flags);
982 }
983 fs->curr_blkno =
984 _get_new_blk_no(fs->blk_bmaps[i]);
985 if (fs->curr_blkno == -1)
986 /* block bitmap is completely filled */
987 continue;
988 fs->curr_blkno = fs->curr_blkno +
989 (i * fs->blksz * 8);
990 fs->first_pass_bbmap++;
991 ext4fs_bg_free_blocks_dec(bgd, fs);
992 ext4fs_sb_free_blocks_dec(fs->sb);
993 status = ext4fs_devread(b_bitmap_blk *
994 fs->sect_perblk,
995 0, fs->blksz,
996 journal_buffer);
997 if (status == 0)
998 goto fail;
999 if (ext4fs_log_journal(journal_buffer,
1000 b_bitmap_blk))
1001 goto fail;
1002 goto success;
1003 } else {
1004 debug("no space left on block group %d\n", i);
1005 }
1006 }
1007
1008 goto fail;
1009 } else {
1010 fs->curr_blkno++;
1011 restart:
1012 /* get the blockbitmap index respective to blockno */
1013 bg_idx = fs->curr_blkno / blk_per_grp;
1014 if (fs->blksz == 1024) {
1015 remainder = fs->curr_blkno % blk_per_grp;
1016 if (!remainder)
1017 bg_idx--;
1018 }
1019
1020 /*
1021 * To skip completely filled block group bitmaps
1022 * Optimize the block allocation
1023 */
1024 if (bg_idx >= fs->no_blkgrp)
1025 goto fail;
1026
1027 struct ext2_block_group *bgd = NULL;
1028 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1029 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1030 debug("block group %u is full. Skipping\n", bg_idx);
1031 fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1032 if (fs->blksz == 1024)
1033 fs->curr_blkno += 1;
1034 goto restart;
1035 }
1036
1037 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1038 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1039 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1040 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1041 put_ext4(b_bitmap_blk * fs->blksz,
1042 zero_buffer, fs->blksz);
1043 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1044 ext4fs_bg_set_flags(bgd, bg_flags);
1045 }
1046
1047 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1048 bg_idx) != 0) {
1049 debug("going for restart for the block no %ld %u\n",
1050 fs->curr_blkno, bg_idx);
1051 fs->curr_blkno++;
1052 goto restart;
1053 }
1054
1055 /* journal backup */
1056 if (prev_bg_bitmap_index != bg_idx) {
1057 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1058 0, fs->blksz, journal_buffer);
1059 if (status == 0)
1060 goto fail;
1061 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1062 goto fail;
1063
1064 prev_bg_bitmap_index = bg_idx;
1065 }
1066 ext4fs_bg_free_blocks_dec(bgd, fs);
1067 ext4fs_sb_free_blocks_dec(fs->sb);
1068 goto success;
1069 }
1070 success:
1071 free(journal_buffer);
1072 free(zero_buffer);
1073
1074 return fs->curr_blkno;
1075 fail:
1076 free(journal_buffer);
1077 free(zero_buffer);
1078
1079 return -1;
1080 }
1081
1082 int ext4fs_get_new_inode_no(void)
1083 {
1084 short i;
1085 short status;
1086 unsigned int ibmap_idx;
1087 static int prev_inode_bitmap_index = -1;
1088 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1089 struct ext_filesystem *fs = get_fs();
1090 char *journal_buffer = zalloc(fs->blksz);
1091 char *zero_buffer = zalloc(fs->blksz);
1092 if (!journal_buffer || !zero_buffer)
1093 goto fail;
1094 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1095 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1096
1097 if (fs->first_pass_ibmap == 0) {
1098 for (i = 0; i < fs->no_blkgrp; i++) {
1099 uint32_t free_inodes;
1100 struct ext2_block_group *bgd = NULL;
1101 bgd = ext4fs_get_group_descriptor(fs, i);
1102 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1103 if (free_inodes) {
1104 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1105 uint64_t i_bitmap_blk =
1106 ext4fs_bg_get_inode_id(bgd, fs);
1107 if (has_gdt_chksum)
1108 bgd->bg_itable_unused = free_inodes;
1109 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1110 put_ext4(i_bitmap_blk * fs->blksz,
1111 zero_buffer, fs->blksz);
1112 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1113 ext4fs_bg_set_flags(bgd, bg_flags);
1114 memcpy(fs->inode_bmaps[i],
1115 zero_buffer, fs->blksz);
1116 }
1117 fs->curr_inode_no =
1118 _get_new_inode_no(fs->inode_bmaps[i]);
1119 if (fs->curr_inode_no == -1)
1120 /* inode bitmap is completely filled */
1121 continue;
1122 fs->curr_inode_no = fs->curr_inode_no +
1123 (i * inodes_per_grp);
1124 fs->first_pass_ibmap++;
1125 ext4fs_bg_free_inodes_dec(bgd, fs);
1126 if (has_gdt_chksum)
1127 ext4fs_bg_itable_unused_dec(bgd, fs);
1128 ext4fs_sb_free_inodes_dec(fs->sb);
1129 status = ext4fs_devread(i_bitmap_blk *
1130 fs->sect_perblk,
1131 0, fs->blksz,
1132 journal_buffer);
1133 if (status == 0)
1134 goto fail;
1135 if (ext4fs_log_journal(journal_buffer,
1136 i_bitmap_blk))
1137 goto fail;
1138 goto success;
1139 } else
1140 debug("no inode left on block group %d\n", i);
1141 }
1142 goto fail;
1143 } else {
1144 restart:
1145 fs->curr_inode_no++;
1146 /* get the blockbitmap index respective to blockno */
1147 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1148 struct ext2_block_group *bgd =
1149 ext4fs_get_group_descriptor(fs, ibmap_idx);
1150 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1151 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1152
1153 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1154 put_ext4(i_bitmap_blk * fs->blksz,
1155 zero_buffer, fs->blksz);
1156 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1157 ext4fs_bg_set_flags(bgd, bg_flags);
1158 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1159 fs->blksz);
1160 }
1161
1162 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1163 fs->inode_bmaps[ibmap_idx],
1164 ibmap_idx) != 0) {
1165 debug("going for restart for the block no %d %u\n",
1166 fs->curr_inode_no, ibmap_idx);
1167 goto restart;
1168 }
1169
1170 /* journal backup */
1171 if (prev_inode_bitmap_index != ibmap_idx) {
1172 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1173 0, fs->blksz, journal_buffer);
1174 if (status == 0)
1175 goto fail;
1176 if (ext4fs_log_journal(journal_buffer,
1177 le32_to_cpu(bgd->inode_id)))
1178 goto fail;
1179 prev_inode_bitmap_index = ibmap_idx;
1180 }
1181 ext4fs_bg_free_inodes_dec(bgd, fs);
1182 if (has_gdt_chksum)
1183 bgd->bg_itable_unused = bgd->free_inodes;
1184 ext4fs_sb_free_inodes_dec(fs->sb);
1185 goto success;
1186 }
1187
1188 success:
1189 free(journal_buffer);
1190 free(zero_buffer);
1191
1192 return fs->curr_inode_no;
1193 fail:
1194 free(journal_buffer);
1195 free(zero_buffer);
1196
1197 return -1;
1198
1199 }
1200
1201
1202 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1203 unsigned int *total_remaining_blocks,
1204 unsigned int *no_blks_reqd)
1205 {
1206 short i;
1207 short status;
1208 long int actual_block_no;
1209 long int si_blockno;
1210 /* si :single indirect */
1211 __le32 *si_buffer = NULL;
1212 __le32 *si_start_addr = NULL;
1213 struct ext_filesystem *fs = get_fs();
1214
1215 if (*total_remaining_blocks != 0) {
1216 si_buffer = zalloc(fs->blksz);
1217 if (!si_buffer) {
1218 printf("No Memory\n");
1219 return;
1220 }
1221 si_start_addr = si_buffer;
1222 si_blockno = ext4fs_get_new_blk_no();
1223 if (si_blockno == -1) {
1224 printf("no block left to assign\n");
1225 goto fail;
1226 }
1227 (*no_blks_reqd)++;
1228 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1229
1230 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1231 0, fs->blksz, (char *)si_buffer);
1232 memset(si_buffer, '\0', fs->blksz);
1233 if (status == 0)
1234 goto fail;
1235
1236 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1237 actual_block_no = ext4fs_get_new_blk_no();
1238 if (actual_block_no == -1) {
1239 printf("no block left to assign\n");
1240 goto fail;
1241 }
1242 *si_buffer = cpu_to_le32(actual_block_no);
1243 debug("SIAB %u: %u\n", *si_buffer,
1244 *total_remaining_blocks);
1245
1246 si_buffer++;
1247 (*total_remaining_blocks)--;
1248 if (*total_remaining_blocks == 0)
1249 break;
1250 }
1251
1252 /* write the block to disk */
1253 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1254 si_start_addr, fs->blksz);
1255 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1256 }
1257 fail:
1258 free(si_start_addr);
1259 }
1260
1261 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1262 unsigned int *total_remaining_blocks,
1263 unsigned int *no_blks_reqd)
1264 {
1265 short i;
1266 short j;
1267 short status;
1268 long int actual_block_no;
1269 /* di:double indirect */
1270 long int di_blockno_parent;
1271 long int di_blockno_child;
1272 __le32 *di_parent_buffer = NULL;
1273 __le32 *di_child_buff = NULL;
1274 __le32 *di_block_start_addr = NULL;
1275 __le32 *di_child_buff_start = NULL;
1276 struct ext_filesystem *fs = get_fs();
1277
1278 if (*total_remaining_blocks != 0) {
1279 /* double indirect parent block connecting to inode */
1280 di_blockno_parent = ext4fs_get_new_blk_no();
1281 if (di_blockno_parent == -1) {
1282 printf("no block left to assign\n");
1283 goto fail;
1284 }
1285 di_parent_buffer = zalloc(fs->blksz);
1286 if (!di_parent_buffer)
1287 goto fail;
1288
1289 di_block_start_addr = di_parent_buffer;
1290 (*no_blks_reqd)++;
1291 debug("DIPB %ld: %u\n", di_blockno_parent,
1292 *total_remaining_blocks);
1293
1294 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1295 fs->sect_perblk, 0,
1296 fs->blksz, (char *)di_parent_buffer);
1297
1298 if (!status) {
1299 printf("%s: Device read error!\n", __func__);
1300 goto fail;
1301 }
1302 memset(di_parent_buffer, '\0', fs->blksz);
1303
1304 /*
1305 * start:for each double indirect parent
1306 * block create one more block
1307 */
1308 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1309 di_blockno_child = ext4fs_get_new_blk_no();
1310 if (di_blockno_child == -1) {
1311 printf("no block left to assign\n");
1312 goto fail;
1313 }
1314 di_child_buff = zalloc(fs->blksz);
1315 if (!di_child_buff)
1316 goto fail;
1317
1318 di_child_buff_start = di_child_buff;
1319 *di_parent_buffer = cpu_to_le32(di_blockno_child);
1320 di_parent_buffer++;
1321 (*no_blks_reqd)++;
1322 debug("DICB %ld: %u\n", di_blockno_child,
1323 *total_remaining_blocks);
1324
1325 status = ext4fs_devread((lbaint_t)di_blockno_child *
1326 fs->sect_perblk, 0,
1327 fs->blksz,
1328 (char *)di_child_buff);
1329
1330 if (!status) {
1331 printf("%s: Device read error!\n", __func__);
1332 goto fail;
1333 }
1334 memset(di_child_buff, '\0', fs->blksz);
1335 /* filling of actual datablocks for each child */
1336 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1337 actual_block_no = ext4fs_get_new_blk_no();
1338 if (actual_block_no == -1) {
1339 printf("no block left to assign\n");
1340 goto fail;
1341 }
1342 *di_child_buff = cpu_to_le32(actual_block_no);
1343 debug("DIAB %ld: %u\n", actual_block_no,
1344 *total_remaining_blocks);
1345
1346 di_child_buff++;
1347 (*total_remaining_blocks)--;
1348 if (*total_remaining_blocks == 0)
1349 break;
1350 }
1351 /* write the block table */
1352 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1353 di_child_buff_start, fs->blksz);
1354 free(di_child_buff_start);
1355 di_child_buff_start = NULL;
1356
1357 if (*total_remaining_blocks == 0)
1358 break;
1359 }
1360 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1361 di_block_start_addr, fs->blksz);
1362 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1363 }
1364 fail:
1365 free(di_block_start_addr);
1366 }
1367
1368 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1369 unsigned int *total_remaining_blocks,
1370 unsigned int *no_blks_reqd)
1371 {
1372 short i;
1373 short j;
1374 short k;
1375 long int actual_block_no;
1376 /* ti: Triple Indirect */
1377 long int ti_gp_blockno;
1378 long int ti_parent_blockno;
1379 long int ti_child_blockno;
1380 __le32 *ti_gp_buff = NULL;
1381 __le32 *ti_parent_buff = NULL;
1382 __le32 *ti_child_buff = NULL;
1383 __le32 *ti_gp_buff_start_addr = NULL;
1384 __le32 *ti_pbuff_start_addr = NULL;
1385 __le32 *ti_cbuff_start_addr = NULL;
1386 struct ext_filesystem *fs = get_fs();
1387 if (*total_remaining_blocks != 0) {
1388 /* triple indirect grand parent block connecting to inode */
1389 ti_gp_blockno = ext4fs_get_new_blk_no();
1390 if (ti_gp_blockno == -1) {
1391 printf("no block left to assign\n");
1392 return;
1393 }
1394 ti_gp_buff = zalloc(fs->blksz);
1395 if (!ti_gp_buff)
1396 return;
1397
1398 ti_gp_buff_start_addr = ti_gp_buff;
1399 (*no_blks_reqd)++;
1400 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1401 *total_remaining_blocks);
1402
1403 /* for each 4 byte grand parent entry create one more block */
1404 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1405 ti_parent_blockno = ext4fs_get_new_blk_no();
1406 if (ti_parent_blockno == -1) {
1407 printf("no block left to assign\n");
1408 goto fail;
1409 }
1410 ti_parent_buff = zalloc(fs->blksz);
1411 if (!ti_parent_buff)
1412 goto fail;
1413
1414 ti_pbuff_start_addr = ti_parent_buff;
1415 *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1416 ti_gp_buff++;
1417 (*no_blks_reqd)++;
1418 debug("TIPB %ld: %u\n", ti_parent_blockno,
1419 *total_remaining_blocks);
1420
1421 /* for each 4 byte entry parent create one more block */
1422 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1423 ti_child_blockno = ext4fs_get_new_blk_no();
1424 if (ti_child_blockno == -1) {
1425 printf("no block left assign\n");
1426 goto fail1;
1427 }
1428 ti_child_buff = zalloc(fs->blksz);
1429 if (!ti_child_buff)
1430 goto fail1;
1431
1432 ti_cbuff_start_addr = ti_child_buff;
1433 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1434 ti_parent_buff++;
1435 (*no_blks_reqd)++;
1436 debug("TICB %ld: %u\n", ti_parent_blockno,
1437 *total_remaining_blocks);
1438
1439 /* fill actual datablocks for each child */
1440 for (k = 0; k < (fs->blksz / sizeof(int));
1441 k++) {
1442 actual_block_no =
1443 ext4fs_get_new_blk_no();
1444 if (actual_block_no == -1) {
1445 printf("no block left\n");
1446 free(ti_cbuff_start_addr);
1447 goto fail1;
1448 }
1449 *ti_child_buff = cpu_to_le32(actual_block_no);
1450 debug("TIAB %ld: %u\n", actual_block_no,
1451 *total_remaining_blocks);
1452
1453 ti_child_buff++;
1454 (*total_remaining_blocks)--;
1455 if (*total_remaining_blocks == 0)
1456 break;
1457 }
1458 /* write the child block */
1459 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1460 (uint64_t)fs->blksz)),
1461 ti_cbuff_start_addr, fs->blksz);
1462 free(ti_cbuff_start_addr);
1463
1464 if (*total_remaining_blocks == 0)
1465 break;
1466 }
1467 /* write the parent block */
1468 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1469 ti_pbuff_start_addr, fs->blksz);
1470 free(ti_pbuff_start_addr);
1471
1472 if (*total_remaining_blocks == 0)
1473 break;
1474 }
1475 /* write the grand parent block */
1476 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1477 ti_gp_buff_start_addr, fs->blksz);
1478 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1479 free(ti_gp_buff_start_addr);
1480 return;
1481 }
1482 fail1:
1483 free(ti_pbuff_start_addr);
1484 fail:
1485 free(ti_gp_buff_start_addr);
1486 }
1487
1488 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1489 unsigned int total_remaining_blocks,
1490 unsigned int *total_no_of_block)
1491 {
1492 short i;
1493 long int direct_blockno;
1494 unsigned int no_blks_reqd = 0;
1495
1496 /* allocation of direct blocks */
1497 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1498 direct_blockno = ext4fs_get_new_blk_no();
1499 if (direct_blockno == -1) {
1500 printf("no block left to assign\n");
1501 return;
1502 }
1503 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1504 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1505
1506 total_remaining_blocks--;
1507 }
1508
1509 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1510 &no_blks_reqd);
1511 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1512 &no_blks_reqd);
1513 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1514 &no_blks_reqd);
1515 *total_no_of_block += no_blks_reqd;
1516 }
1517
1518 #endif
1519
1520 static struct ext4_extent_header *ext4fs_get_extent_block
1521 (struct ext2_data *data, char *buf,
1522 struct ext4_extent_header *ext_block,
1523 uint32_t fileblock, int log2_blksz)
1524 {
1525 struct ext4_extent_idx *index;
1526 unsigned long long block;
1527 int blksz = EXT2_BLOCK_SIZE(data);
1528 int i;
1529
1530 while (1) {
1531 index = (struct ext4_extent_idx *)(ext_block + 1);
1532
1533 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1534 return NULL;
1535
1536 if (ext_block->eh_depth == 0)
1537 return ext_block;
1538 i = -1;
1539 do {
1540 i++;
1541 if (i >= le16_to_cpu(ext_block->eh_entries))
1542 break;
1543 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1544
1545 if (--i < 0)
1546 return NULL;
1547
1548 block = le16_to_cpu(index[i].ei_leaf_hi);
1549 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1550
1551 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1552 buf))
1553 ext_block = (struct ext4_extent_header *)buf;
1554 else
1555 return NULL;
1556 }
1557 }
1558
1559 static int ext4fs_blockgroup
1560 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1561 {
1562 long int blkno;
1563 unsigned int blkoff, desc_per_blk;
1564 int log2blksz = get_fs()->dev_desc->log2blksz;
1565 int desc_size = get_fs()->gdsize;
1566
1567 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1568
1569 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1570 group / desc_per_blk;
1571 blkoff = (group % desc_per_blk) * desc_size;
1572
1573 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1574 group, blkno, blkoff);
1575
1576 return ext4fs_devread((lbaint_t)blkno <<
1577 (LOG2_BLOCK_SIZE(data) - log2blksz),
1578 blkoff, desc_size, (char *)blkgrp);
1579 }
1580
1581 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1582 {
1583 struct ext2_block_group blkgrp;
1584 struct ext2_sblock *sblock = &data->sblock;
1585 struct ext_filesystem *fs = get_fs();
1586 int log2blksz = get_fs()->dev_desc->log2blksz;
1587 int inodes_per_block, status;
1588 long int blkno;
1589 unsigned int blkoff;
1590
1591 /* It is easier to calculate if the first inode is 0. */
1592 ino--;
1593 status = ext4fs_blockgroup(data, ino / le32_to_cpu
1594 (sblock->inodes_per_group), &blkgrp);
1595 if (status == 0)
1596 return 0;
1597
1598 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1599 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
1600 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1601 blkoff = (ino % inodes_per_block) * fs->inodesz;
1602 /* Read the inode. */
1603 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1604 log2blksz), blkoff,
1605 sizeof(struct ext2_inode), (char *)inode);
1606 if (status == 0)
1607 return 0;
1608
1609 return 1;
1610 }
1611
1612 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1613 {
1614 long int blknr;
1615 int blksz;
1616 int log2_blksz;
1617 int status;
1618 long int rblock;
1619 long int perblock_parent;
1620 long int perblock_child;
1621 unsigned long long start;
1622 /* get the blocksize of the filesystem */
1623 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1624 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1625 - get_fs()->dev_desc->log2blksz;
1626
1627 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1628 char *buf = zalloc(blksz);
1629 if (!buf)
1630 return -ENOMEM;
1631 struct ext4_extent_header *ext_block;
1632 struct ext4_extent *extent;
1633 int i = -1;
1634 ext_block =
1635 ext4fs_get_extent_block(ext4fs_root, buf,
1636 (struct ext4_extent_header *)
1637 inode->b.blocks.dir_blocks,
1638 fileblock, log2_blksz);
1639 if (!ext_block) {
1640 printf("invalid extent block\n");
1641 free(buf);
1642 return -EINVAL;
1643 }
1644
1645 extent = (struct ext4_extent *)(ext_block + 1);
1646
1647 do {
1648 i++;
1649 if (i >= le16_to_cpu(ext_block->eh_entries))
1650 break;
1651 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1652 if (--i >= 0) {
1653 fileblock -= le32_to_cpu(extent[i].ee_block);
1654 if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1655 free(buf);
1656 return 0;
1657 }
1658
1659 start = le16_to_cpu(extent[i].ee_start_hi);
1660 start = (start << 32) +
1661 le32_to_cpu(extent[i].ee_start_lo);
1662 free(buf);
1663 return fileblock + start;
1664 }
1665
1666 printf("Extent Error\n");
1667 free(buf);
1668 return -1;
1669 }
1670
1671 /* Direct blocks. */
1672 if (fileblock < INDIRECT_BLOCKS)
1673 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1674
1675 /* Indirect. */
1676 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1677 if (ext4fs_indir1_block == NULL) {
1678 ext4fs_indir1_block = zalloc(blksz);
1679 if (ext4fs_indir1_block == NULL) {
1680 printf("** SI ext2fs read block (indir 1)"
1681 "malloc failed. **\n");
1682 return -1;
1683 }
1684 ext4fs_indir1_size = blksz;
1685 ext4fs_indir1_blkno = -1;
1686 }
1687 if (blksz != ext4fs_indir1_size) {
1688 free(ext4fs_indir1_block);
1689 ext4fs_indir1_block = NULL;
1690 ext4fs_indir1_size = 0;
1691 ext4fs_indir1_blkno = -1;
1692 ext4fs_indir1_block = zalloc(blksz);
1693 if (ext4fs_indir1_block == NULL) {
1694 printf("** SI ext2fs read block (indir 1):"
1695 "malloc failed. **\n");
1696 return -1;
1697 }
1698 ext4fs_indir1_size = blksz;
1699 }
1700 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1701 log2_blksz) != ext4fs_indir1_blkno) {
1702 status =
1703 ext4fs_devread((lbaint_t)le32_to_cpu
1704 (inode->b.blocks.
1705 indir_block) << log2_blksz, 0,
1706 blksz, (char *)ext4fs_indir1_block);
1707 if (status == 0) {
1708 printf("** SI ext2fs read block (indir 1)"
1709 "failed. **\n");
1710 return -1;
1711 }
1712 ext4fs_indir1_blkno =
1713 le32_to_cpu(inode->b.blocks.
1714 indir_block) << log2_blksz;
1715 }
1716 blknr = le32_to_cpu(ext4fs_indir1_block
1717 [fileblock - INDIRECT_BLOCKS]);
1718 }
1719 /* Double indirect. */
1720 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1721 (blksz / 4 + 1)))) {
1722
1723 long int perblock = blksz / 4;
1724 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1725
1726 if (ext4fs_indir1_block == NULL) {
1727 ext4fs_indir1_block = zalloc(blksz);
1728 if (ext4fs_indir1_block == NULL) {
1729 printf("** DI ext2fs read block (indir 2 1)"
1730 "malloc failed. **\n");
1731 return -1;
1732 }
1733 ext4fs_indir1_size = blksz;
1734 ext4fs_indir1_blkno = -1;
1735 }
1736 if (blksz != ext4fs_indir1_size) {
1737 free(ext4fs_indir1_block);
1738 ext4fs_indir1_block = NULL;
1739 ext4fs_indir1_size = 0;
1740 ext4fs_indir1_blkno = -1;
1741 ext4fs_indir1_block = zalloc(blksz);
1742 if (ext4fs_indir1_block == NULL) {
1743 printf("** DI ext2fs read block (indir 2 1)"
1744 "malloc failed. **\n");
1745 return -1;
1746 }
1747 ext4fs_indir1_size = blksz;
1748 }
1749 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1750 log2_blksz) != ext4fs_indir1_blkno) {
1751 status =
1752 ext4fs_devread((lbaint_t)le32_to_cpu
1753 (inode->b.blocks.
1754 double_indir_block) << log2_blksz,
1755 0, blksz,
1756 (char *)ext4fs_indir1_block);
1757 if (status == 0) {
1758 printf("** DI ext2fs read block (indir 2 1)"
1759 "failed. **\n");
1760 return -1;
1761 }
1762 ext4fs_indir1_blkno =
1763 le32_to_cpu(inode->b.blocks.double_indir_block) <<
1764 log2_blksz;
1765 }
1766
1767 if (ext4fs_indir2_block == NULL) {
1768 ext4fs_indir2_block = zalloc(blksz);
1769 if (ext4fs_indir2_block == NULL) {
1770 printf("** DI ext2fs read block (indir 2 2)"
1771 "malloc failed. **\n");
1772 return -1;
1773 }
1774 ext4fs_indir2_size = blksz;
1775 ext4fs_indir2_blkno = -1;
1776 }
1777 if (blksz != ext4fs_indir2_size) {
1778 free(ext4fs_indir2_block);
1779 ext4fs_indir2_block = NULL;
1780 ext4fs_indir2_size = 0;
1781 ext4fs_indir2_blkno = -1;
1782 ext4fs_indir2_block = zalloc(blksz);
1783 if (ext4fs_indir2_block == NULL) {
1784 printf("** DI ext2fs read block (indir 2 2)"
1785 "malloc failed. **\n");
1786 return -1;
1787 }
1788 ext4fs_indir2_size = blksz;
1789 }
1790 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1791 log2_blksz) != ext4fs_indir2_blkno) {
1792 status = ext4fs_devread((lbaint_t)le32_to_cpu
1793 (ext4fs_indir1_block
1794 [rblock /
1795 perblock]) << log2_blksz, 0,
1796 blksz,
1797 (char *)ext4fs_indir2_block);
1798 if (status == 0) {
1799 printf("** DI ext2fs read block (indir 2 2)"
1800 "failed. **\n");
1801 return -1;
1802 }
1803 ext4fs_indir2_blkno =
1804 le32_to_cpu(ext4fs_indir1_block[rblock
1805 /
1806 perblock]) <<
1807 log2_blksz;
1808 }
1809 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1810 }
1811 /* Tripple indirect. */
1812 else {
1813 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1814 (blksz / 4 * blksz / 4));
1815 perblock_child = blksz / 4;
1816 perblock_parent = ((blksz / 4) * (blksz / 4));
1817
1818 if (ext4fs_indir1_block == NULL) {
1819 ext4fs_indir1_block = zalloc(blksz);
1820 if (ext4fs_indir1_block == NULL) {
1821 printf("** TI ext2fs read block (indir 2 1)"
1822 "malloc failed. **\n");
1823 return -1;
1824 }
1825 ext4fs_indir1_size = blksz;
1826 ext4fs_indir1_blkno = -1;
1827 }
1828 if (blksz != ext4fs_indir1_size) {
1829 free(ext4fs_indir1_block);
1830 ext4fs_indir1_block = NULL;
1831 ext4fs_indir1_size = 0;
1832 ext4fs_indir1_blkno = -1;
1833 ext4fs_indir1_block = zalloc(blksz);
1834 if (ext4fs_indir1_block == NULL) {
1835 printf("** TI ext2fs read block (indir 2 1)"
1836 "malloc failed. **\n");
1837 return -1;
1838 }
1839 ext4fs_indir1_size = blksz;
1840 }
1841 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1842 log2_blksz) != ext4fs_indir1_blkno) {
1843 status = ext4fs_devread
1844 ((lbaint_t)
1845 le32_to_cpu(inode->b.blocks.triple_indir_block)
1846 << log2_blksz, 0, blksz,
1847 (char *)ext4fs_indir1_block);
1848 if (status == 0) {
1849 printf("** TI ext2fs read block (indir 2 1)"
1850 "failed. **\n");
1851 return -1;
1852 }
1853 ext4fs_indir1_blkno =
1854 le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1855 log2_blksz;
1856 }
1857
1858 if (ext4fs_indir2_block == NULL) {
1859 ext4fs_indir2_block = zalloc(blksz);
1860 if (ext4fs_indir2_block == NULL) {
1861 printf("** TI ext2fs read block (indir 2 2)"
1862 "malloc failed. **\n");
1863 return -1;
1864 }
1865 ext4fs_indir2_size = blksz;
1866 ext4fs_indir2_blkno = -1;
1867 }
1868 if (blksz != ext4fs_indir2_size) {
1869 free(ext4fs_indir2_block);
1870 ext4fs_indir2_block = NULL;
1871 ext4fs_indir2_size = 0;
1872 ext4fs_indir2_blkno = -1;
1873 ext4fs_indir2_block = zalloc(blksz);
1874 if (ext4fs_indir2_block == NULL) {
1875 printf("** TI ext2fs read block (indir 2 2)"
1876 "malloc failed. **\n");
1877 return -1;
1878 }
1879 ext4fs_indir2_size = blksz;
1880 }
1881 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1882 perblock_parent]) <<
1883 log2_blksz)
1884 != ext4fs_indir2_blkno) {
1885 status = ext4fs_devread((lbaint_t)le32_to_cpu
1886 (ext4fs_indir1_block
1887 [rblock /
1888 perblock_parent]) <<
1889 log2_blksz, 0, blksz,
1890 (char *)ext4fs_indir2_block);
1891 if (status == 0) {
1892 printf("** TI ext2fs read block (indir 2 2)"
1893 "failed. **\n");
1894 return -1;
1895 }
1896 ext4fs_indir2_blkno =
1897 le32_to_cpu(ext4fs_indir1_block[rblock /
1898 perblock_parent])
1899 << log2_blksz;
1900 }
1901
1902 if (ext4fs_indir3_block == NULL) {
1903 ext4fs_indir3_block = zalloc(blksz);
1904 if (ext4fs_indir3_block == NULL) {
1905 printf("** TI ext2fs read block (indir 2 2)"
1906 "malloc failed. **\n");
1907 return -1;
1908 }
1909 ext4fs_indir3_size = blksz;
1910 ext4fs_indir3_blkno = -1;
1911 }
1912 if (blksz != ext4fs_indir3_size) {
1913 free(ext4fs_indir3_block);
1914 ext4fs_indir3_block = NULL;
1915 ext4fs_indir3_size = 0;
1916 ext4fs_indir3_blkno = -1;
1917 ext4fs_indir3_block = zalloc(blksz);
1918 if (ext4fs_indir3_block == NULL) {
1919 printf("** TI ext2fs read block (indir 2 2)"
1920 "malloc failed. **\n");
1921 return -1;
1922 }
1923 ext4fs_indir3_size = blksz;
1924 }
1925 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1926 /
1927 perblock_child]) <<
1928 log2_blksz) != ext4fs_indir3_blkno) {
1929 status =
1930 ext4fs_devread((lbaint_t)le32_to_cpu
1931 (ext4fs_indir2_block
1932 [(rblock / perblock_child)
1933 % (blksz / 4)]) << log2_blksz, 0,
1934 blksz, (char *)ext4fs_indir3_block);
1935 if (status == 0) {
1936 printf("** TI ext2fs read block (indir 2 2)"
1937 "failed. **\n");
1938 return -1;
1939 }
1940 ext4fs_indir3_blkno =
1941 le32_to_cpu(ext4fs_indir2_block[(rblock /
1942 perblock_child) %
1943 (blksz /
1944 4)]) <<
1945 log2_blksz;
1946 }
1947
1948 blknr = le32_to_cpu(ext4fs_indir3_block
1949 [rblock % perblock_child]);
1950 }
1951 debug("read_allocated_block %ld\n", blknr);
1952
1953 return blknr;
1954 }
1955
1956 /**
1957 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1958 * global pointers
1959 *
1960 * This function assures that for a file with the same name but different size
1961 * the sequential store on the ext4 filesystem will be correct.
1962 *
1963 * In this function the global data, responsible for internal representation
1964 * of the ext4 data are initialized to the reset state. Without this, during
1965 * replacement of the smaller file with the bigger truncation of new file was
1966 * performed.
1967 */
1968 void ext4fs_reinit_global(void)
1969 {
1970 if (ext4fs_indir1_block != NULL) {
1971 free(ext4fs_indir1_block);
1972 ext4fs_indir1_block = NULL;
1973 ext4fs_indir1_size = 0;
1974 ext4fs_indir1_blkno = -1;
1975 }
1976 if (ext4fs_indir2_block != NULL) {
1977 free(ext4fs_indir2_block);
1978 ext4fs_indir2_block = NULL;
1979 ext4fs_indir2_size = 0;
1980 ext4fs_indir2_blkno = -1;
1981 }
1982 if (ext4fs_indir3_block != NULL) {
1983 free(ext4fs_indir3_block);
1984 ext4fs_indir3_block = NULL;
1985 ext4fs_indir3_size = 0;
1986 ext4fs_indir3_blkno = -1;
1987 }
1988 }
1989 void ext4fs_close(void)
1990 {
1991 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1992 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1993 ext4fs_file = NULL;
1994 }
1995 if (ext4fs_root != NULL) {
1996 free(ext4fs_root);
1997 ext4fs_root = NULL;
1998 }
1999
2000 ext4fs_reinit_global();
2001 }
2002
2003 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2004 struct ext2fs_node **fnode, int *ftype)
2005 {
2006 unsigned int fpos = 0;
2007 int status;
2008 loff_t actread;
2009 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2010
2011 #ifdef DEBUG
2012 if (name != NULL)
2013 printf("Iterate dir %s\n", name);
2014 #endif /* of DEBUG */
2015 if (!diro->inode_read) {
2016 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2017 if (status == 0)
2018 return 0;
2019 }
2020 /* Search the file. */
2021 while (fpos < le32_to_cpu(diro->inode.size)) {
2022 struct ext2_dirent dirent;
2023
2024 status = ext4fs_read_file(diro, fpos,
2025 sizeof(struct ext2_dirent),
2026 (char *)&dirent, &actread);
2027 if (status < 0)
2028 return 0;
2029
2030 if (dirent.direntlen == 0) {
2031 printf("Failed to iterate over directory %s\n", name);
2032 return 0;
2033 }
2034
2035 if (dirent.namelen != 0) {
2036 char filename[dirent.namelen + 1];
2037 struct ext2fs_node *fdiro;
2038 int type = FILETYPE_UNKNOWN;
2039
2040 status = ext4fs_read_file(diro,
2041 fpos +
2042 sizeof(struct ext2_dirent),
2043 dirent.namelen, filename,
2044 &actread);
2045 if (status < 0)
2046 return 0;
2047
2048 fdiro = zalloc(sizeof(struct ext2fs_node));
2049 if (!fdiro)
2050 return 0;
2051
2052 fdiro->data = diro->data;
2053 fdiro->ino = le32_to_cpu(dirent.inode);
2054
2055 filename[dirent.namelen] = '\0';
2056
2057 if (dirent.filetype != FILETYPE_UNKNOWN) {
2058 fdiro->inode_read = 0;
2059
2060 if (dirent.filetype == FILETYPE_DIRECTORY)
2061 type = FILETYPE_DIRECTORY;
2062 else if (dirent.filetype == FILETYPE_SYMLINK)
2063 type = FILETYPE_SYMLINK;
2064 else if (dirent.filetype == FILETYPE_REG)
2065 type = FILETYPE_REG;
2066 } else {
2067 status = ext4fs_read_inode(diro->data,
2068 le32_to_cpu
2069 (dirent.inode),
2070 &fdiro->inode);
2071 if (status == 0) {
2072 free(fdiro);
2073 return 0;
2074 }
2075 fdiro->inode_read = 1;
2076
2077 if ((le16_to_cpu(fdiro->inode.mode) &
2078 FILETYPE_INO_MASK) ==
2079 FILETYPE_INO_DIRECTORY) {
2080 type = FILETYPE_DIRECTORY;
2081 } else if ((le16_to_cpu(fdiro->inode.mode)
2082 & FILETYPE_INO_MASK) ==
2083 FILETYPE_INO_SYMLINK) {
2084 type = FILETYPE_SYMLINK;
2085 } else if ((le16_to_cpu(fdiro->inode.mode)
2086 & FILETYPE_INO_MASK) ==
2087 FILETYPE_INO_REG) {
2088 type = FILETYPE_REG;
2089 }
2090 }
2091 #ifdef DEBUG
2092 printf("iterate >%s<\n", filename);
2093 #endif /* of DEBUG */
2094 if ((name != NULL) && (fnode != NULL)
2095 && (ftype != NULL)) {
2096 if (strcmp(filename, name) == 0) {
2097 *ftype = type;
2098 *fnode = fdiro;
2099 return 1;
2100 }
2101 } else {
2102 if (fdiro->inode_read == 0) {
2103 status = ext4fs_read_inode(diro->data,
2104 le32_to_cpu(
2105 dirent.inode),
2106 &fdiro->inode);
2107 if (status == 0) {
2108 free(fdiro);
2109 return 0;
2110 }
2111 fdiro->inode_read = 1;
2112 }
2113 switch (type) {
2114 case FILETYPE_DIRECTORY:
2115 printf("<DIR> ");
2116 break;
2117 case FILETYPE_SYMLINK:
2118 printf("<SYM> ");
2119 break;
2120 case FILETYPE_REG:
2121 printf(" ");
2122 break;
2123 default:
2124 printf("< ? > ");
2125 break;
2126 }
2127 printf("%10u %s\n",
2128 le32_to_cpu(fdiro->inode.size),
2129 filename);
2130 }
2131 free(fdiro);
2132 }
2133 fpos += le16_to_cpu(dirent.direntlen);
2134 }
2135 return 0;
2136 }
2137
2138 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2139 {
2140 char *symlink;
2141 struct ext2fs_node *diro = node;
2142 int status;
2143 loff_t actread;
2144
2145 if (!diro->inode_read) {
2146 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2147 if (status == 0)
2148 return NULL;
2149 }
2150 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2151 if (!symlink)
2152 return NULL;
2153
2154 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2155 strncpy(symlink, diro->inode.b.symlink,
2156 le32_to_cpu(diro->inode.size));
2157 } else {
2158 status = ext4fs_read_file(diro, 0,
2159 le32_to_cpu(diro->inode.size),
2160 symlink, &actread);
2161 if ((status < 0) || (actread == 0)) {
2162 free(symlink);
2163 return NULL;
2164 }
2165 }
2166 symlink[le32_to_cpu(diro->inode.size)] = '\0';
2167 return symlink;
2168 }
2169
2170 static int ext4fs_find_file1(const char *currpath,
2171 struct ext2fs_node *currroot,
2172 struct ext2fs_node **currfound, int *foundtype)
2173 {
2174 char fpath[strlen(currpath) + 1];
2175 char *name = fpath;
2176 char *next;
2177 int status;
2178 int type = FILETYPE_DIRECTORY;
2179 struct ext2fs_node *currnode = currroot;
2180 struct ext2fs_node *oldnode = currroot;
2181
2182 strncpy(fpath, currpath, strlen(currpath) + 1);
2183
2184 /* Remove all leading slashes. */
2185 while (*name == '/')
2186 name++;
2187
2188 if (!*name) {
2189 *currfound = currnode;
2190 return 1;
2191 }
2192
2193 for (;;) {
2194 int found;
2195
2196 /* Extract the actual part from the pathname. */
2197 next = strchr(name, '/');
2198 if (next) {
2199 /* Remove all leading slashes. */
2200 while (*next == '/')
2201 *(next++) = '\0';
2202 }
2203
2204 if (type != FILETYPE_DIRECTORY) {
2205 ext4fs_free_node(currnode, currroot);
2206 return 0;
2207 }
2208
2209 oldnode = currnode;
2210
2211 /* Iterate over the directory. */
2212 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2213 if (found == 0)
2214 return 0;
2215
2216 if (found == -1)
2217 break;
2218
2219 /* Read in the symlink and follow it. */
2220 if (type == FILETYPE_SYMLINK) {
2221 char *symlink;
2222
2223 /* Test if the symlink does not loop. */
2224 if (++symlinknest == 8) {
2225 ext4fs_free_node(currnode, currroot);
2226 ext4fs_free_node(oldnode, currroot);
2227 return 0;
2228 }
2229
2230 symlink = ext4fs_read_symlink(currnode);
2231 ext4fs_free_node(currnode, currroot);
2232
2233 if (!symlink) {
2234 ext4fs_free_node(oldnode, currroot);
2235 return 0;
2236 }
2237
2238 debug("Got symlink >%s<\n", symlink);
2239
2240 if (symlink[0] == '/') {
2241 ext4fs_free_node(oldnode, currroot);
2242 oldnode = &ext4fs_root->diropen;
2243 }
2244
2245 /* Lookup the node the symlink points to. */
2246 status = ext4fs_find_file1(symlink, oldnode,
2247 &currnode, &type);
2248
2249 free(symlink);
2250
2251 if (status == 0) {
2252 ext4fs_free_node(oldnode, currroot);
2253 return 0;
2254 }
2255 }
2256
2257 ext4fs_free_node(oldnode, currroot);
2258
2259 /* Found the node! */
2260 if (!next || *next == '\0') {
2261 *currfound = currnode;
2262 *foundtype = type;
2263 return 1;
2264 }
2265 name = next;
2266 }
2267 return -1;
2268 }
2269
2270 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2271 struct ext2fs_node **foundnode, int expecttype)
2272 {
2273 int status;
2274 int foundtype = FILETYPE_DIRECTORY;
2275
2276 symlinknest = 0;
2277 if (!path)
2278 return 0;
2279
2280 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2281 if (status == 0)
2282 return 0;
2283
2284 /* Check if the node that was found was of the expected type. */
2285 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2286 return 0;
2287 else if ((expecttype == FILETYPE_DIRECTORY)
2288 && (foundtype != expecttype))
2289 return 0;
2290
2291 return 1;
2292 }
2293
2294 int ext4fs_open(const char *filename, loff_t *len)
2295 {
2296 struct ext2fs_node *fdiro = NULL;
2297 int status;
2298
2299 if (ext4fs_root == NULL)
2300 return -1;
2301
2302 ext4fs_file = NULL;
2303 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2304 FILETYPE_REG);
2305 if (status == 0)
2306 goto fail;
2307
2308 if (!fdiro->inode_read) {
2309 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2310 &fdiro->inode);
2311 if (status == 0)
2312 goto fail;
2313 }
2314 *len = le32_to_cpu(fdiro->inode.size);
2315 ext4fs_file = fdiro;
2316
2317 return 0;
2318 fail:
2319 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2320
2321 return -1;
2322 }
2323
2324 int ext4fs_mount(unsigned part_length)
2325 {
2326 struct ext2_data *data;
2327 int status;
2328 struct ext_filesystem *fs = get_fs();
2329 data = zalloc(SUPERBLOCK_SIZE);
2330 if (!data)
2331 return 0;
2332
2333 /* Read the superblock. */
2334 status = ext4_read_superblock((char *)&data->sblock);
2335
2336 if (status == 0)
2337 goto fail;
2338
2339 /* Make sure this is an ext2 filesystem. */
2340 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2341 goto fail;
2342
2343
2344 if (le32_to_cpu(data->sblock.revision_level) == 0) {
2345 fs->inodesz = 128;
2346 } else {
2347 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2348 __le32_to_cpu(data->sblock.feature_compatibility),
2349 __le32_to_cpu(data->sblock.feature_incompat),
2350 __le32_to_cpu(data->sblock.feature_ro_compat));
2351
2352 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2353 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2354 EXT4_FEATURE_INCOMPAT_64BIT ?
2355 le16_to_cpu(data->sblock.descriptor_size) : 32;
2356 }
2357
2358 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2359 le32_to_cpu(data->sblock.revision_level),
2360 fs->inodesz, fs->gdsize);
2361
2362 data->diropen.data = data;
2363 data->diropen.ino = 2;
2364 data->diropen.inode_read = 1;
2365 data->inode = &data->diropen.inode;
2366
2367 status = ext4fs_read_inode(data, 2, data->inode);
2368 if (status == 0)
2369 goto fail;
2370
2371 ext4fs_root = data;
2372
2373 return 1;
2374 fail:
2375 printf("Failed to mount ext2 filesystem...\n");
2376 free(data);
2377 ext4fs_root = NULL;
2378
2379 return 0;
2380 }
"Das U-Boot" Source Tree