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 <inttypes.h>
25 #include <malloc.h>
26 #include <memalign.h>
27 #include <stddef.h>
28 #include <linux/stat.h>
29 #include <linux/time.h>
30 #include <asm/byteorder.h>
31 #include "ext4_common.h"
32
33 struct ext2_data *ext4fs_root;
34 struct ext2fs_node *ext4fs_file;
35 __le32 *ext4fs_indir1_block;
36 int ext4fs_indir1_size;
37 int ext4fs_indir1_blkno = -1;
38 __le32 *ext4fs_indir2_block;
39 int ext4fs_indir2_size;
40 int ext4fs_indir2_blkno = -1;
41
42 __le32 *ext4fs_indir3_block;
43 int ext4fs_indir3_size;
44 int ext4fs_indir3_blkno = -1;
45 struct ext2_inode *g_parent_inode;
46 static int symlinknest;
47
48 #if defined(CONFIG_EXT4_WRITE)
ext4fs_get_group_descriptor(const struct ext_filesystem * fs,uint32_t bg_idx)49 struct ext2_block_group *ext4fs_get_group_descriptor
50 (const struct ext_filesystem *fs, uint32_t bg_idx)
51 {
52 return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
53 }
54
ext4fs_sb_free_inodes_dec(struct ext2_sblock * sb)55 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
56 {
57 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
58 }
59
ext4fs_sb_free_blocks_dec(struct ext2_sblock * sb)60 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
61 {
62 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
63 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
64 free_blocks--;
65
66 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
67 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
68 }
69
ext4fs_bg_free_inodes_dec(struct ext2_block_group * bg,const struct ext_filesystem * fs)70 static inline void ext4fs_bg_free_inodes_dec
71 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
72 {
73 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
74 if (fs->gdsize == 64)
75 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
76 free_inodes--;
77
78 bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
79 if (fs->gdsize == 64)
80 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
81 }
82
ext4fs_bg_free_blocks_dec(struct ext2_block_group * bg,const struct ext_filesystem * fs)83 static inline void ext4fs_bg_free_blocks_dec
84 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
85 {
86 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
87 if (fs->gdsize == 64)
88 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
89 free_blocks--;
90
91 bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
92 if (fs->gdsize == 64)
93 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
94 }
95
ext4fs_bg_itable_unused_dec(struct ext2_block_group * bg,const struct ext_filesystem * fs)96 static inline void ext4fs_bg_itable_unused_dec
97 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
98 {
99 uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
100 if (fs->gdsize == 64)
101 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
102 free_inodes--;
103
104 bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
105 if (fs->gdsize == 64)
106 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
107 }
108
ext4fs_sb_get_free_blocks(const struct ext2_sblock * sb)109 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
110 {
111 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
112 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
113 return free_blocks;
114 }
115
ext4fs_sb_set_free_blocks(struct ext2_sblock * sb,uint64_t free_blocks)116 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
117 {
118 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
119 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
120 }
121
ext4fs_bg_get_free_blocks(const struct ext2_block_group * bg,const struct ext_filesystem * fs)122 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
123 const struct ext_filesystem *fs)
124 {
125 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
126 if (fs->gdsize == 64)
127 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
128 return free_blocks;
129 }
130
131 static inline
ext4fs_bg_get_free_inodes(const struct ext2_block_group * bg,const struct ext_filesystem * fs)132 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
133 const struct ext_filesystem *fs)
134 {
135 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
136 if (fs->gdsize == 64)
137 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
138 return free_inodes;
139 }
140
ext4fs_bg_get_flags(const struct ext2_block_group * bg)141 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
142 {
143 return le16_to_cpu(bg->bg_flags);
144 }
145
ext4fs_bg_set_flags(struct ext2_block_group * bg,uint16_t flags)146 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
147 uint16_t flags)
148 {
149 bg->bg_flags = cpu_to_le16(flags);
150 }
151
152 /* Block number of the block bitmap */
ext4fs_bg_get_block_id(const struct ext2_block_group * bg,const struct ext_filesystem * fs)153 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
154 const struct ext_filesystem *fs)
155 {
156 uint64_t block_nr = le32_to_cpu(bg->block_id);
157 if (fs->gdsize == 64)
158 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
159 return block_nr;
160 }
161
162 /* Block number of the inode bitmap */
ext4fs_bg_get_inode_id(const struct ext2_block_group * bg,const struct ext_filesystem * fs)163 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
164 const struct ext_filesystem *fs)
165 {
166 uint64_t block_nr = le32_to_cpu(bg->inode_id);
167 if (fs->gdsize == 64)
168 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
169 return block_nr;
170 }
171 #endif
172
173 /* Block number of the inode table */
ext4fs_bg_get_inode_table_id(const struct ext2_block_group * bg,const struct ext_filesystem * fs)174 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
175 const struct ext_filesystem *fs)
176 {
177 uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
178 if (fs->gdsize == 64)
179 block_nr +=
180 (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
181 return block_nr;
182 }
183
184 #if defined(CONFIG_EXT4_WRITE)
ext4fs_div_roundup(uint32_t size,uint32_t n)185 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
186 {
187 uint32_t res = size / n;
188 if (res * n != size)
189 res++;
190
191 return res;
192 }
193
put_ext4(uint64_t off,void * buf,uint32_t size)194 void put_ext4(uint64_t off, void *buf, uint32_t size)
195 {
196 uint64_t startblock;
197 uint64_t remainder;
198 unsigned char *temp_ptr = NULL;
199 struct ext_filesystem *fs = get_fs();
200 int log2blksz = fs->dev_desc->log2blksz;
201 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
202
203 startblock = off >> log2blksz;
204 startblock += part_offset;
205 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
206
207 if (fs->dev_desc == NULL)
208 return;
209
210 if ((startblock + (size >> log2blksz)) >
211 (part_offset + fs->total_sect)) {
212 printf("part_offset is " LBAFU "\n", part_offset);
213 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
214 printf("error: overflow occurs\n");
215 return;
216 }
217
218 if (remainder) {
219 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
220 temp_ptr = sec_buf;
221 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
222 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
223 } else {
224 if (size >> log2blksz != 0) {
225 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
226 (unsigned long *)buf);
227 } else {
228 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
229 temp_ptr = sec_buf;
230 memcpy(temp_ptr, buf, size);
231 blk_dwrite(fs->dev_desc, startblock, 1,
232 (unsigned long *)sec_buf);
233 }
234 }
235 }
236
_get_new_inode_no(unsigned char * buffer)237 static int _get_new_inode_no(unsigned char *buffer)
238 {
239 struct ext_filesystem *fs = get_fs();
240 unsigned char input;
241 int operand, status;
242 int count = 1;
243 int j = 0;
244
245 /* get the blocksize of the filesystem */
246 unsigned char *ptr = buffer;
247 while (*ptr == 255) {
248 ptr++;
249 count += 8;
250 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
251 return -1;
252 }
253
254 for (j = 0; j < fs->blksz; j++) {
255 input = *ptr;
256 int i = 0;
257 while (i <= 7) {
258 operand = 1 << i;
259 status = input & operand;
260 if (status) {
261 i++;
262 count++;
263 } else {
264 *ptr |= operand;
265 return count;
266 }
267 }
268 ptr = ptr + 1;
269 }
270
271 return -1;
272 }
273
_get_new_blk_no(unsigned char * buffer)274 static int _get_new_blk_no(unsigned char *buffer)
275 {
276 int operand;
277 int count = 0;
278 int i;
279 unsigned char *ptr = buffer;
280 struct ext_filesystem *fs = get_fs();
281
282 while (*ptr == 255) {
283 ptr++;
284 count += 8;
285 if (count == (fs->blksz * 8))
286 return -1;
287 }
288
289 if (fs->blksz == 1024)
290 count += 1;
291
292 for (i = 0; i <= 7; i++) {
293 operand = 1 << i;
294 if (*ptr & operand) {
295 count++;
296 } else {
297 *ptr |= operand;
298 return count;
299 }
300 }
301
302 return -1;
303 }
304
ext4fs_set_block_bmap(long int blockno,unsigned char * buffer,int index)305 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
306 {
307 int i, remainder, status;
308 unsigned char *ptr = buffer;
309 unsigned char operand;
310 i = blockno / 8;
311 remainder = blockno % 8;
312 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
313
314 i = i - (index * blocksize);
315 if (blocksize != 1024) {
316 ptr = ptr + i;
317 operand = 1 << remainder;
318 status = *ptr & operand;
319 if (status)
320 return -1;
321
322 *ptr = *ptr | operand;
323 return 0;
324 } else {
325 if (remainder == 0) {
326 ptr = ptr + i - 1;
327 operand = (1 << 7);
328 } else {
329 ptr = ptr + i;
330 operand = (1 << (remainder - 1));
331 }
332 status = *ptr & operand;
333 if (status)
334 return -1;
335
336 *ptr = *ptr | operand;
337 return 0;
338 }
339 }
340
ext4fs_reset_block_bmap(long int blockno,unsigned char * buffer,int index)341 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
342 {
343 int i, remainder, status;
344 unsigned char *ptr = buffer;
345 unsigned char operand;
346 i = blockno / 8;
347 remainder = blockno % 8;
348 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
349
350 i = i - (index * blocksize);
351 if (blocksize != 1024) {
352 ptr = ptr + i;
353 operand = (1 << remainder);
354 status = *ptr & operand;
355 if (status)
356 *ptr = *ptr & ~(operand);
357 } else {
358 if (remainder == 0) {
359 ptr = ptr + i - 1;
360 operand = (1 << 7);
361 } else {
362 ptr = ptr + i;
363 operand = (1 << (remainder - 1));
364 }
365 status = *ptr & operand;
366 if (status)
367 *ptr = *ptr & ~(operand);
368 }
369 }
370
ext4fs_set_inode_bmap(int inode_no,unsigned char * buffer,int index)371 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
372 {
373 int i, remainder, status;
374 unsigned char *ptr = buffer;
375 unsigned char operand;
376
377 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
378 i = inode_no / 8;
379 remainder = inode_no % 8;
380 if (remainder == 0) {
381 ptr = ptr + i - 1;
382 operand = (1 << 7);
383 } else {
384 ptr = ptr + i;
385 operand = (1 << (remainder - 1));
386 }
387 status = *ptr & operand;
388 if (status)
389 return -1;
390
391 *ptr = *ptr | operand;
392
393 return 0;
394 }
395
ext4fs_reset_inode_bmap(int inode_no,unsigned char * buffer,int index)396 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
397 {
398 int i, remainder, status;
399 unsigned char *ptr = buffer;
400 unsigned char operand;
401
402 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
403 i = inode_no / 8;
404 remainder = inode_no % 8;
405 if (remainder == 0) {
406 ptr = ptr + i - 1;
407 operand = (1 << 7);
408 } else {
409 ptr = ptr + i;
410 operand = (1 << (remainder - 1));
411 }
412 status = *ptr & operand;
413 if (status)
414 *ptr = *ptr & ~(operand);
415 }
416
ext4fs_checksum_update(uint32_t i)417 uint16_t ext4fs_checksum_update(uint32_t i)
418 {
419 struct ext2_block_group *desc;
420 struct ext_filesystem *fs = get_fs();
421 uint16_t crc = 0;
422 __le32 le32_i = cpu_to_le32(i);
423
424 desc = ext4fs_get_group_descriptor(fs, i);
425 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
426 int offset = offsetof(struct ext2_block_group, bg_checksum);
427
428 crc = ext2fs_crc16(~0, fs->sb->unique_id,
429 sizeof(fs->sb->unique_id));
430 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
431 crc = ext2fs_crc16(crc, desc, offset);
432 offset += sizeof(desc->bg_checksum); /* skip checksum */
433 assert(offset == sizeof(*desc));
434 if (offset < fs->gdsize) {
435 crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
436 fs->gdsize - offset);
437 }
438 }
439
440 return crc;
441 }
442
check_void_in_dentry(struct ext2_dirent * dir,char * filename)443 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
444 {
445 int dentry_length;
446 int sizeof_void_space;
447 int new_entry_byte_reqd;
448 short padding_factor = 0;
449
450 if (dir->namelen % 4 != 0)
451 padding_factor = 4 - (dir->namelen % 4);
452
453 dentry_length = sizeof(struct ext2_dirent) +
454 dir->namelen + padding_factor;
455 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
456 if (sizeof_void_space == 0)
457 return 0;
458
459 padding_factor = 0;
460 if (strlen(filename) % 4 != 0)
461 padding_factor = 4 - (strlen(filename) % 4);
462
463 new_entry_byte_reqd = strlen(filename) +
464 sizeof(struct ext2_dirent) + padding_factor;
465 if (sizeof_void_space >= new_entry_byte_reqd) {
466 dir->direntlen = cpu_to_le16(dentry_length);
467 return sizeof_void_space;
468 }
469
470 return 0;
471 }
472
ext4fs_update_parent_dentry(char * filename,int file_type)473 int ext4fs_update_parent_dentry(char *filename, int file_type)
474 {
475 unsigned int *zero_buffer = NULL;
476 char *root_first_block_buffer = NULL;
477 int blk_idx;
478 long int first_block_no_of_root = 0;
479 int totalbytes = 0;
480 unsigned int new_entry_byte_reqd;
481 int sizeof_void_space = 0;
482 int templength = 0;
483 int inodeno = -1;
484 int status;
485 struct ext_filesystem *fs = get_fs();
486 /* directory entry */
487 struct ext2_dirent *dir;
488 char *temp_dir = NULL;
489 uint32_t new_blk_no;
490 uint32_t new_size;
491 uint32_t new_blockcnt;
492 uint32_t directory_blocks;
493
494 zero_buffer = zalloc(fs->blksz);
495 if (!zero_buffer) {
496 printf("No Memory\n");
497 return -1;
498 }
499 root_first_block_buffer = zalloc(fs->blksz);
500 if (!root_first_block_buffer) {
501 free(zero_buffer);
502 printf("No Memory\n");
503 return -1;
504 }
505 new_entry_byte_reqd = ROUND(strlen(filename) +
506 sizeof(struct ext2_dirent), 4);
507 restart:
508 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
509 LOG2_BLOCK_SIZE(ext4fs_root);
510 blk_idx = directory_blocks - 1;
511
512 restart_read:
513 /* read the block no allocated to a file */
514 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx);
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
search_dir(struct ext2_inode * parent_inode,char * dirname)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);
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
find_dir_depth(char * dirname)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
parse_path(char ** arr,char * dirname)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
ext4fs_iget(int inode_no,struct ext2_inode * inode)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 */
ext4fs_get_parent_inode_num(const char * dirname,char * dname,int flags)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
unlink_filename(char * filename,unsigned int blknr)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
ext4fs_filename_unlink(char * filename)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);
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
ext4fs_get_new_blk_no(void)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
ext4fs_get_new_inode_no(void)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
alloc_single_indirect_block(struct ext2_inode * file_inode,unsigned int * total_remaining_blocks,unsigned int * no_blks_reqd)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
alloc_double_indirect_block(struct ext2_inode * file_inode,unsigned int * total_remaining_blocks,unsigned int * no_blks_reqd)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
alloc_triple_indirect_block(struct ext2_inode * file_inode,unsigned int * total_remaining_blocks,unsigned int * no_blks_reqd)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
ext4fs_allocate_blocks(struct ext2_inode * file_inode,unsigned int total_remaining_blocks,unsigned int * total_no_of_block)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
ext4fs_get_extent_block(struct ext2_data * data,char * buf,struct ext4_extent_header * ext_block,uint32_t fileblock,int log2_blksz)1525 static struct ext4_extent_header *ext4fs_get_extent_block
1526 (struct ext2_data *data, char *buf,
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
1556 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1557 buf))
1558 ext_block = (struct ext4_extent_header *)buf;
1559 else
1560 return NULL;
1561 }
1562 }
1563
ext4fs_blockgroup(struct ext2_data * data,int group,struct ext2_block_group * blkgrp)1564 static int ext4fs_blockgroup
1565 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1566 {
1567 long int blkno;
1568 unsigned int blkoff, desc_per_blk;
1569 int log2blksz = get_fs()->dev_desc->log2blksz;
1570 int desc_size = get_fs()->gdsize;
1571
1572 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1573
1574 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1575 group / desc_per_blk;
1576 blkoff = (group % desc_per_blk) * desc_size;
1577
1578 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1579 group, blkno, blkoff);
1580
1581 return ext4fs_devread((lbaint_t)blkno <<
1582 (LOG2_BLOCK_SIZE(data) - log2blksz),
1583 blkoff, desc_size, (char *)blkgrp);
1584 }
1585
ext4fs_read_inode(struct ext2_data * data,int ino,struct ext2_inode * inode)1586 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1587 {
1588 struct ext2_block_group blkgrp;
1589 struct ext2_sblock *sblock = &data->sblock;
1590 struct ext_filesystem *fs = get_fs();
1591 int log2blksz = get_fs()->dev_desc->log2blksz;
1592 int inodes_per_block, status;
1593 long int blkno;
1594 unsigned int blkoff;
1595
1596 /* It is easier to calculate if the first inode is 0. */
1597 ino--;
1598 status = ext4fs_blockgroup(data, ino / le32_to_cpu
1599 (sblock->inodes_per_group), &blkgrp);
1600 if (status == 0)
1601 return 0;
1602
1603 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1604 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
1605 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1606 blkoff = (ino % inodes_per_block) * fs->inodesz;
1607 /* Read the inode. */
1608 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1609 log2blksz), blkoff,
1610 sizeof(struct ext2_inode), (char *)inode);
1611 if (status == 0)
1612 return 0;
1613
1614 return 1;
1615 }
1616
read_allocated_block(struct ext2_inode * inode,int fileblock)1617 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1618 {
1619 long int blknr;
1620 int blksz;
1621 int log2_blksz;
1622 int status;
1623 long int rblock;
1624 long int perblock_parent;
1625 long int perblock_child;
1626 unsigned long long start;
1627 /* get the blocksize of the filesystem */
1628 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1629 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1630 - get_fs()->dev_desc->log2blksz;
1631
1632 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1633 long int startblock, endblock;
1634 char *buf = zalloc(blksz);
1635 if (!buf)
1636 return -ENOMEM;
1637 struct ext4_extent_header *ext_block;
1638 struct ext4_extent *extent;
1639 int i;
1640 ext_block =
1641 ext4fs_get_extent_block(ext4fs_root, buf,
1642 (struct ext4_extent_header *)
1643 inode->b.blocks.dir_blocks,
1644 fileblock, log2_blksz);
1645 if (!ext_block) {
1646 printf("invalid extent block\n");
1647 free(buf);
1648 return -EINVAL;
1649 }
1650
1651 extent = (struct ext4_extent *)(ext_block + 1);
1652
1653 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1654 startblock = le32_to_cpu(extent[i].ee_block);
1655 endblock = startblock + le16_to_cpu(extent[i].ee_len);
1656
1657 if (startblock > fileblock) {
1658 /* Sparse file */
1659 free(buf);
1660 return 0;
1661
1662 } else if (fileblock < endblock) {
1663 start = le16_to_cpu(extent[i].ee_start_hi);
1664 start = (start << 32) +
1665 le32_to_cpu(extent[i].ee_start_lo);
1666 free(buf);
1667 return (fileblock - startblock) + start;
1668 }
1669 }
1670
1671 free(buf);
1672 return 0;
1673 }
1674
1675 /* Direct blocks. */
1676 if (fileblock < INDIRECT_BLOCKS)
1677 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1678
1679 /* Indirect. */
1680 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1681 if (ext4fs_indir1_block == NULL) {
1682 ext4fs_indir1_block = zalloc(blksz);
1683 if (ext4fs_indir1_block == NULL) {
1684 printf("** SI ext2fs read block (indir 1)"
1685 "malloc failed. **\n");
1686 return -1;
1687 }
1688 ext4fs_indir1_size = blksz;
1689 ext4fs_indir1_blkno = -1;
1690 }
1691 if (blksz != ext4fs_indir1_size) {
1692 free(ext4fs_indir1_block);
1693 ext4fs_indir1_block = NULL;
1694 ext4fs_indir1_size = 0;
1695 ext4fs_indir1_blkno = -1;
1696 ext4fs_indir1_block = zalloc(blksz);
1697 if (ext4fs_indir1_block == NULL) {
1698 printf("** SI ext2fs read block (indir 1):"
1699 "malloc failed. **\n");
1700 return -1;
1701 }
1702 ext4fs_indir1_size = blksz;
1703 }
1704 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1705 log2_blksz) != ext4fs_indir1_blkno) {
1706 status =
1707 ext4fs_devread((lbaint_t)le32_to_cpu
1708 (inode->b.blocks.
1709 indir_block) << log2_blksz, 0,
1710 blksz, (char *)ext4fs_indir1_block);
1711 if (status == 0) {
1712 printf("** SI ext2fs read block (indir 1)"
1713 "failed. **\n");
1714 return -1;
1715 }
1716 ext4fs_indir1_blkno =
1717 le32_to_cpu(inode->b.blocks.
1718 indir_block) << log2_blksz;
1719 }
1720 blknr = le32_to_cpu(ext4fs_indir1_block
1721 [fileblock - INDIRECT_BLOCKS]);
1722 }
1723 /* Double indirect. */
1724 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1725 (blksz / 4 + 1)))) {
1726
1727 long int perblock = blksz / 4;
1728 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1729
1730 if (ext4fs_indir1_block == NULL) {
1731 ext4fs_indir1_block = zalloc(blksz);
1732 if (ext4fs_indir1_block == NULL) {
1733 printf("** DI ext2fs read block (indir 2 1)"
1734 "malloc failed. **\n");
1735 return -1;
1736 }
1737 ext4fs_indir1_size = blksz;
1738 ext4fs_indir1_blkno = -1;
1739 }
1740 if (blksz != ext4fs_indir1_size) {
1741 free(ext4fs_indir1_block);
1742 ext4fs_indir1_block = NULL;
1743 ext4fs_indir1_size = 0;
1744 ext4fs_indir1_blkno = -1;
1745 ext4fs_indir1_block = zalloc(blksz);
1746 if (ext4fs_indir1_block == NULL) {
1747 printf("** DI ext2fs read block (indir 2 1)"
1748 "malloc failed. **\n");
1749 return -1;
1750 }
1751 ext4fs_indir1_size = blksz;
1752 }
1753 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1754 log2_blksz) != ext4fs_indir1_blkno) {
1755 status =
1756 ext4fs_devread((lbaint_t)le32_to_cpu
1757 (inode->b.blocks.
1758 double_indir_block) << log2_blksz,
1759 0, blksz,
1760 (char *)ext4fs_indir1_block);
1761 if (status == 0) {
1762 printf("** DI ext2fs read block (indir 2 1)"
1763 "failed. **\n");
1764 return -1;
1765 }
1766 ext4fs_indir1_blkno =
1767 le32_to_cpu(inode->b.blocks.double_indir_block) <<
1768 log2_blksz;
1769 }
1770
1771 if (ext4fs_indir2_block == NULL) {
1772 ext4fs_indir2_block = zalloc(blksz);
1773 if (ext4fs_indir2_block == NULL) {
1774 printf("** DI ext2fs read block (indir 2 2)"
1775 "malloc failed. **\n");
1776 return -1;
1777 }
1778 ext4fs_indir2_size = blksz;
1779 ext4fs_indir2_blkno = -1;
1780 }
1781 if (blksz != ext4fs_indir2_size) {
1782 free(ext4fs_indir2_block);
1783 ext4fs_indir2_block = NULL;
1784 ext4fs_indir2_size = 0;
1785 ext4fs_indir2_blkno = -1;
1786 ext4fs_indir2_block = zalloc(blksz);
1787 if (ext4fs_indir2_block == NULL) {
1788 printf("** DI ext2fs read block (indir 2 2)"
1789 "malloc failed. **\n");
1790 return -1;
1791 }
1792 ext4fs_indir2_size = blksz;
1793 }
1794 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1795 log2_blksz) != ext4fs_indir2_blkno) {
1796 status = ext4fs_devread((lbaint_t)le32_to_cpu
1797 (ext4fs_indir1_block
1798 [rblock /
1799 perblock]) << log2_blksz, 0,
1800 blksz,
1801 (char *)ext4fs_indir2_block);
1802 if (status == 0) {
1803 printf("** DI ext2fs read block (indir 2 2)"
1804 "failed. **\n");
1805 return -1;
1806 }
1807 ext4fs_indir2_blkno =
1808 le32_to_cpu(ext4fs_indir1_block[rblock
1809 /
1810 perblock]) <<
1811 log2_blksz;
1812 }
1813 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1814 }
1815 /* Tripple indirect. */
1816 else {
1817 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1818 (blksz / 4 * blksz / 4));
1819 perblock_child = blksz / 4;
1820 perblock_parent = ((blksz / 4) * (blksz / 4));
1821
1822 if (ext4fs_indir1_block == NULL) {
1823 ext4fs_indir1_block = zalloc(blksz);
1824 if (ext4fs_indir1_block == NULL) {
1825 printf("** TI ext2fs read block (indir 2 1)"
1826 "malloc failed. **\n");
1827 return -1;
1828 }
1829 ext4fs_indir1_size = blksz;
1830 ext4fs_indir1_blkno = -1;
1831 }
1832 if (blksz != ext4fs_indir1_size) {
1833 free(ext4fs_indir1_block);
1834 ext4fs_indir1_block = NULL;
1835 ext4fs_indir1_size = 0;
1836 ext4fs_indir1_blkno = -1;
1837 ext4fs_indir1_block = zalloc(blksz);
1838 if (ext4fs_indir1_block == NULL) {
1839 printf("** TI ext2fs read block (indir 2 1)"
1840 "malloc failed. **\n");
1841 return -1;
1842 }
1843 ext4fs_indir1_size = blksz;
1844 }
1845 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1846 log2_blksz) != ext4fs_indir1_blkno) {
1847 status = ext4fs_devread
1848 ((lbaint_t)
1849 le32_to_cpu(inode->b.blocks.triple_indir_block)
1850 << log2_blksz, 0, blksz,
1851 (char *)ext4fs_indir1_block);
1852 if (status == 0) {
1853 printf("** TI ext2fs read block (indir 2 1)"
1854 "failed. **\n");
1855 return -1;
1856 }
1857 ext4fs_indir1_blkno =
1858 le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1859 log2_blksz;
1860 }
1861
1862 if (ext4fs_indir2_block == NULL) {
1863 ext4fs_indir2_block = zalloc(blksz);
1864 if (ext4fs_indir2_block == NULL) {
1865 printf("** TI ext2fs read block (indir 2 2)"
1866 "malloc failed. **\n");
1867 return -1;
1868 }
1869 ext4fs_indir2_size = blksz;
1870 ext4fs_indir2_blkno = -1;
1871 }
1872 if (blksz != ext4fs_indir2_size) {
1873 free(ext4fs_indir2_block);
1874 ext4fs_indir2_block = NULL;
1875 ext4fs_indir2_size = 0;
1876 ext4fs_indir2_blkno = -1;
1877 ext4fs_indir2_block = zalloc(blksz);
1878 if (ext4fs_indir2_block == NULL) {
1879 printf("** TI ext2fs read block (indir 2 2)"
1880 "malloc failed. **\n");
1881 return -1;
1882 }
1883 ext4fs_indir2_size = blksz;
1884 }
1885 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1886 perblock_parent]) <<
1887 log2_blksz)
1888 != ext4fs_indir2_blkno) {
1889 status = ext4fs_devread((lbaint_t)le32_to_cpu
1890 (ext4fs_indir1_block
1891 [rblock /
1892 perblock_parent]) <<
1893 log2_blksz, 0, blksz,
1894 (char *)ext4fs_indir2_block);
1895 if (status == 0) {
1896 printf("** TI ext2fs read block (indir 2 2)"
1897 "failed. **\n");
1898 return -1;
1899 }
1900 ext4fs_indir2_blkno =
1901 le32_to_cpu(ext4fs_indir1_block[rblock /
1902 perblock_parent])
1903 << log2_blksz;
1904 }
1905
1906 if (ext4fs_indir3_block == NULL) {
1907 ext4fs_indir3_block = zalloc(blksz);
1908 if (ext4fs_indir3_block == NULL) {
1909 printf("** TI ext2fs read block (indir 2 2)"
1910 "malloc failed. **\n");
1911 return -1;
1912 }
1913 ext4fs_indir3_size = blksz;
1914 ext4fs_indir3_blkno = -1;
1915 }
1916 if (blksz != ext4fs_indir3_size) {
1917 free(ext4fs_indir3_block);
1918 ext4fs_indir3_block = NULL;
1919 ext4fs_indir3_size = 0;
1920 ext4fs_indir3_blkno = -1;
1921 ext4fs_indir3_block = zalloc(blksz);
1922 if (ext4fs_indir3_block == NULL) {
1923 printf("** TI ext2fs read block (indir 2 2)"
1924 "malloc failed. **\n");
1925 return -1;
1926 }
1927 ext4fs_indir3_size = blksz;
1928 }
1929 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1930 /
1931 perblock_child]) <<
1932 log2_blksz) != ext4fs_indir3_blkno) {
1933 status =
1934 ext4fs_devread((lbaint_t)le32_to_cpu
1935 (ext4fs_indir2_block
1936 [(rblock / perblock_child)
1937 % (blksz / 4)]) << log2_blksz, 0,
1938 blksz, (char *)ext4fs_indir3_block);
1939 if (status == 0) {
1940 printf("** TI ext2fs read block (indir 2 2)"
1941 "failed. **\n");
1942 return -1;
1943 }
1944 ext4fs_indir3_blkno =
1945 le32_to_cpu(ext4fs_indir2_block[(rblock /
1946 perblock_child) %
1947 (blksz /
1948 4)]) <<
1949 log2_blksz;
1950 }
1951
1952 blknr = le32_to_cpu(ext4fs_indir3_block
1953 [rblock % perblock_child]);
1954 }
1955 debug("read_allocated_block %ld\n", blknr);
1956
1957 return blknr;
1958 }
1959
1960 /**
1961 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1962 * global pointers
1963 *
1964 * This function assures that for a file with the same name but different size
1965 * the sequential store on the ext4 filesystem will be correct.
1966 *
1967 * In this function the global data, responsible for internal representation
1968 * of the ext4 data are initialized to the reset state. Without this, during
1969 * replacement of the smaller file with the bigger truncation of new file was
1970 * performed.
1971 */
ext4fs_reinit_global(void)1972 void ext4fs_reinit_global(void)
1973 {
1974 if (ext4fs_indir1_block != NULL) {
1975 free(ext4fs_indir1_block);
1976 ext4fs_indir1_block = NULL;
1977 ext4fs_indir1_size = 0;
1978 ext4fs_indir1_blkno = -1;
1979 }
1980 if (ext4fs_indir2_block != NULL) {
1981 free(ext4fs_indir2_block);
1982 ext4fs_indir2_block = NULL;
1983 ext4fs_indir2_size = 0;
1984 ext4fs_indir2_blkno = -1;
1985 }
1986 if (ext4fs_indir3_block != NULL) {
1987 free(ext4fs_indir3_block);
1988 ext4fs_indir3_block = NULL;
1989 ext4fs_indir3_size = 0;
1990 ext4fs_indir3_blkno = -1;
1991 }
1992 }
ext4fs_close(void)1993 void ext4fs_close(void)
1994 {
1995 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1996 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1997 ext4fs_file = NULL;
1998 }
1999 if (ext4fs_root != NULL) {
2000 free(ext4fs_root);
2001 ext4fs_root = NULL;
2002 }
2003
2004 ext4fs_reinit_global();
2005 }
2006
ext4fs_iterate_dir(struct ext2fs_node * dir,char * name,struct ext2fs_node ** fnode,int * ftype)2007 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2008 struct ext2fs_node **fnode, int *ftype)
2009 {
2010 unsigned int fpos = 0;
2011 int status;
2012 loff_t actread;
2013 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2014
2015 #ifdef DEBUG
2016 if (name != NULL)
2017 printf("Iterate dir %s\n", name);
2018 #endif /* of DEBUG */
2019 if (!diro->inode_read) {
2020 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2021 if (status == 0)
2022 return 0;
2023 }
2024 /* Search the file. */
2025 while (fpos < le32_to_cpu(diro->inode.size)) {
2026 struct ext2_dirent dirent;
2027
2028 status = ext4fs_read_file(diro, fpos,
2029 sizeof(struct ext2_dirent),
2030 (char *)&dirent, &actread);
2031 if (status < 0)
2032 return 0;
2033
2034 if (dirent.direntlen == 0) {
2035 printf("Failed to iterate over directory %s\n", name);
2036 return 0;
2037 }
2038
2039 if (dirent.namelen != 0) {
2040 char filename[dirent.namelen + 1];
2041 struct ext2fs_node *fdiro;
2042 int type = FILETYPE_UNKNOWN;
2043
2044 status = ext4fs_read_file(diro,
2045 fpos +
2046 sizeof(struct ext2_dirent),
2047 dirent.namelen, filename,
2048 &actread);
2049 if (status < 0)
2050 return 0;
2051
2052 fdiro = zalloc(sizeof(struct ext2fs_node));
2053 if (!fdiro)
2054 return 0;
2055
2056 fdiro->data = diro->data;
2057 fdiro->ino = le32_to_cpu(dirent.inode);
2058
2059 filename[dirent.namelen] = '\0';
2060
2061 if (dirent.filetype != FILETYPE_UNKNOWN) {
2062 fdiro->inode_read = 0;
2063
2064 if (dirent.filetype == FILETYPE_DIRECTORY)
2065 type = FILETYPE_DIRECTORY;
2066 else if (dirent.filetype == FILETYPE_SYMLINK)
2067 type = FILETYPE_SYMLINK;
2068 else if (dirent.filetype == FILETYPE_REG)
2069 type = FILETYPE_REG;
2070 } else {
2071 status = ext4fs_read_inode(diro->data,
2072 le32_to_cpu
2073 (dirent.inode),
2074 &fdiro->inode);
2075 if (status == 0) {
2076 free(fdiro);
2077 return 0;
2078 }
2079 fdiro->inode_read = 1;
2080
2081 if ((le16_to_cpu(fdiro->inode.mode) &
2082 FILETYPE_INO_MASK) ==
2083 FILETYPE_INO_DIRECTORY) {
2084 type = FILETYPE_DIRECTORY;
2085 } else if ((le16_to_cpu(fdiro->inode.mode)
2086 & FILETYPE_INO_MASK) ==
2087 FILETYPE_INO_SYMLINK) {
2088 type = FILETYPE_SYMLINK;
2089 } else if ((le16_to_cpu(fdiro->inode.mode)
2090 & FILETYPE_INO_MASK) ==
2091 FILETYPE_INO_REG) {
2092 type = FILETYPE_REG;
2093 }
2094 }
2095 #ifdef DEBUG
2096 printf("iterate >%s<\n", filename);
2097 #endif /* of DEBUG */
2098 if ((name != NULL) && (fnode != NULL)
2099 && (ftype != NULL)) {
2100 if (strcmp(filename, name) == 0) {
2101 *ftype = type;
2102 *fnode = fdiro;
2103 return 1;
2104 }
2105 } else {
2106 if (fdiro->inode_read == 0) {
2107 status = ext4fs_read_inode(diro->data,
2108 le32_to_cpu(
2109 dirent.inode),
2110 &fdiro->inode);
2111 if (status == 0) {
2112 free(fdiro);
2113 return 0;
2114 }
2115 fdiro->inode_read = 1;
2116 }
2117 switch (type) {
2118 case FILETYPE_DIRECTORY:
2119 printf("<DIR> ");
2120 break;
2121 case FILETYPE_SYMLINK:
2122 printf("<SYM> ");
2123 break;
2124 case FILETYPE_REG:
2125 printf(" ");
2126 break;
2127 default:
2128 printf("< ? > ");
2129 break;
2130 }
2131 printf("%10u %s\n",
2132 le32_to_cpu(fdiro->inode.size),
2133 filename);
2134 }
2135 free(fdiro);
2136 }
2137 fpos += le16_to_cpu(dirent.direntlen);
2138 }
2139 return 0;
2140 }
2141
ext4fs_read_symlink(struct ext2fs_node * node)2142 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2143 {
2144 char *symlink;
2145 struct ext2fs_node *diro = node;
2146 int status;
2147 loff_t actread;
2148
2149 if (!diro->inode_read) {
2150 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2151 if (status == 0)
2152 return NULL;
2153 }
2154 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2155 if (!symlink)
2156 return NULL;
2157
2158 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2159 strncpy(symlink, diro->inode.b.symlink,
2160 le32_to_cpu(diro->inode.size));
2161 } else {
2162 status = ext4fs_read_file(diro, 0,
2163 le32_to_cpu(diro->inode.size),
2164 symlink, &actread);
2165 if ((status < 0) || (actread == 0)) {
2166 free(symlink);
2167 return NULL;
2168 }
2169 }
2170 symlink[le32_to_cpu(diro->inode.size)] = '\0';
2171 return symlink;
2172 }
2173
ext4fs_find_file1(const char * currpath,struct ext2fs_node * currroot,struct ext2fs_node ** currfound,int * foundtype)2174 static int ext4fs_find_file1(const char *currpath,
2175 struct ext2fs_node *currroot,
2176 struct ext2fs_node **currfound, int *foundtype)
2177 {
2178 char fpath[strlen(currpath) + 1];
2179 char *name = fpath;
2180 char *next;
2181 int status;
2182 int type = FILETYPE_DIRECTORY;
2183 struct ext2fs_node *currnode = currroot;
2184 struct ext2fs_node *oldnode = currroot;
2185
2186 strncpy(fpath, currpath, strlen(currpath) + 1);
2187
2188 /* Remove all leading slashes. */
2189 while (*name == '/')
2190 name++;
2191
2192 if (!*name) {
2193 *currfound = currnode;
2194 return 1;
2195 }
2196
2197 for (;;) {
2198 int found;
2199
2200 /* Extract the actual part from the pathname. */
2201 next = strchr(name, '/');
2202 if (next) {
2203 /* Remove all leading slashes. */
2204 while (*next == '/')
2205 *(next++) = '\0';
2206 }
2207
2208 if (type != FILETYPE_DIRECTORY) {
2209 ext4fs_free_node(currnode, currroot);
2210 return 0;
2211 }
2212
2213 oldnode = currnode;
2214
2215 /* Iterate over the directory. */
2216 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2217 if (found == 0)
2218 return 0;
2219
2220 if (found == -1)
2221 break;
2222
2223 /* Read in the symlink and follow it. */
2224 if (type == FILETYPE_SYMLINK) {
2225 char *symlink;
2226
2227 /* Test if the symlink does not loop. */
2228 if (++symlinknest == 8) {
2229 ext4fs_free_node(currnode, currroot);
2230 ext4fs_free_node(oldnode, currroot);
2231 return 0;
2232 }
2233
2234 symlink = ext4fs_read_symlink(currnode);
2235 ext4fs_free_node(currnode, currroot);
2236
2237 if (!symlink) {
2238 ext4fs_free_node(oldnode, currroot);
2239 return 0;
2240 }
2241
2242 debug("Got symlink >%s<\n", symlink);
2243
2244 if (symlink[0] == '/') {
2245 ext4fs_free_node(oldnode, currroot);
2246 oldnode = &ext4fs_root->diropen;
2247 }
2248
2249 /* Lookup the node the symlink points to. */
2250 status = ext4fs_find_file1(symlink, oldnode,
2251 &currnode, &type);
2252
2253 free(symlink);
2254
2255 if (status == 0) {
2256 ext4fs_free_node(oldnode, currroot);
2257 return 0;
2258 }
2259 }
2260
2261 ext4fs_free_node(oldnode, currroot);
2262
2263 /* Found the node! */
2264 if (!next || *next == '\0') {
2265 *currfound = currnode;
2266 *foundtype = type;
2267 return 1;
2268 }
2269 name = next;
2270 }
2271 return -1;
2272 }
2273
ext4fs_find_file(const char * path,struct ext2fs_node * rootnode,struct ext2fs_node ** foundnode,int expecttype)2274 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2275 struct ext2fs_node **foundnode, int expecttype)
2276 {
2277 int status;
2278 int foundtype = FILETYPE_DIRECTORY;
2279
2280 symlinknest = 0;
2281 if (!path)
2282 return 0;
2283
2284 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2285 if (status == 0)
2286 return 0;
2287
2288 /* Check if the node that was found was of the expected type. */
2289 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2290 return 0;
2291 else if ((expecttype == FILETYPE_DIRECTORY)
2292 && (foundtype != expecttype))
2293 return 0;
2294
2295 return 1;
2296 }
2297
ext4fs_open(const char * filename,loff_t * len)2298 int ext4fs_open(const char *filename, loff_t *len)
2299 {
2300 struct ext2fs_node *fdiro = NULL;
2301 int status;
2302
2303 if (ext4fs_root == NULL)
2304 return -1;
2305
2306 ext4fs_file = NULL;
2307 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2308 FILETYPE_REG);
2309 if (status == 0)
2310 goto fail;
2311
2312 if (!fdiro->inode_read) {
2313 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2314 &fdiro->inode);
2315 if (status == 0)
2316 goto fail;
2317 }
2318 *len = le32_to_cpu(fdiro->inode.size);
2319 ext4fs_file = fdiro;
2320
2321 return 0;
2322 fail:
2323 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2324
2325 return -1;
2326 }
2327
ext4fs_mount(unsigned part_length)2328 int ext4fs_mount(unsigned part_length)
2329 {
2330 struct ext2_data *data;
2331 int status;
2332 struct ext_filesystem *fs = get_fs();
2333 data = zalloc(SUPERBLOCK_SIZE);
2334 if (!data)
2335 return 0;
2336
2337 /* Read the superblock. */
2338 status = ext4_read_superblock((char *)&data->sblock);
2339
2340 if (status == 0)
2341 goto fail;
2342
2343 /* Make sure this is an ext2 filesystem. */
2344 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2345 goto fail_noerr;
2346
2347
2348 if (le32_to_cpu(data->sblock.revision_level) == 0) {
2349 fs->inodesz = 128;
2350 fs->gdsize = 32;
2351 } else {
2352 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2353 __le32_to_cpu(data->sblock.feature_compatibility),
2354 __le32_to_cpu(data->sblock.feature_incompat),
2355 __le32_to_cpu(data->sblock.feature_ro_compat));
2356
2357 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2358 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2359 EXT4_FEATURE_INCOMPAT_64BIT ?
2360 le16_to_cpu(data->sblock.descriptor_size) : 32;
2361 }
2362
2363 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2364 le32_to_cpu(data->sblock.revision_level),
2365 fs->inodesz, fs->gdsize);
2366
2367 data->diropen.data = data;
2368 data->diropen.ino = 2;
2369 data->diropen.inode_read = 1;
2370 data->inode = &data->diropen.inode;
2371
2372 status = ext4fs_read_inode(data, 2, data->inode);
2373 if (status == 0)
2374 goto fail;
2375
2376 ext4fs_root = data;
2377
2378 return 1;
2379 fail:
2380 printf("Failed to mount ext2 filesystem...\n");
2381 fail_noerr:
2382 free(data);
2383 ext4fs_root = NULL;
2384
2385 return 0;
2386 }
2387