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a1596438 US |
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 | * | |
ed34f34d US |
17 | * ext4write : Based on generic ext4 protocol. |
18 | * | |
1a459660 | 19 | * SPDX-License-Identifier: GPL-2.0+ |
a1596438 US |
20 | */ |
21 | ||
22 | #include <common.h> | |
23 | #include <ext_common.h> | |
24 | #include <ext4fs.h> | |
aac618a3 | 25 | #include <inttypes.h> |
a1596438 | 26 | #include <malloc.h> |
cf92e05c | 27 | #include <memalign.h> |
a1596438 US |
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; | |
58a9ecba | 36 | __le32 *ext4fs_indir1_block; |
a1596438 US |
37 | int ext4fs_indir1_size; |
38 | int ext4fs_indir1_blkno = -1; | |
58a9ecba | 39 | __le32 *ext4fs_indir2_block; |
a1596438 US |
40 | int ext4fs_indir2_size; |
41 | int ext4fs_indir2_blkno = -1; | |
42 | ||
58a9ecba | 43 | __le32 *ext4fs_indir3_block; |
a1596438 US |
44 | int ext4fs_indir3_size; |
45 | int ext4fs_indir3_blkno = -1; | |
46 | struct ext2_inode *g_parent_inode; | |
47 | static int symlinknest; | |
48 | ||
03e2ecf6 | 49 | #if defined(CONFIG_EXT4_WRITE) |
58a9ecba MW |
50 | static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb) |
51 | { | |
52 | sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1); | |
53 | } | |
54 | ||
55 | static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb) | |
56 | { | |
57 | sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) - 1); | |
58 | } | |
59 | ||
60 | static inline void ext4fs_bg_free_inodes_dec(struct ext2_block_group *bg) | |
61 | { | |
62 | bg->free_inodes = cpu_to_le16(le16_to_cpu(bg->free_inodes) - 1); | |
63 | } | |
64 | ||
65 | static inline void ext4fs_bg_free_blocks_dec(struct ext2_block_group *bg) | |
66 | { | |
67 | bg->free_blocks = cpu_to_le16(le16_to_cpu(bg->free_blocks) - 1); | |
68 | } | |
69 | ||
70 | static inline void ext4fs_bg_itable_unused_dec(struct ext2_block_group *bg) | |
71 | { | |
72 | bg->bg_itable_unused = cpu_to_le16(le16_to_cpu(bg->bg_itable_unused) - 1); | |
73 | } | |
74 | ||
ed34f34d US |
75 | uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n) |
76 | { | |
77 | uint32_t res = size / n; | |
78 | if (res * n != size) | |
79 | res++; | |
80 | ||
81 | return res; | |
82 | } | |
83 | ||
84 | void put_ext4(uint64_t off, void *buf, uint32_t size) | |
85 | { | |
86 | uint64_t startblock; | |
87 | uint64_t remainder; | |
88 | unsigned char *temp_ptr = NULL; | |
ed34f34d | 89 | struct ext_filesystem *fs = get_fs(); |
50ce4c07 EE |
90 | int log2blksz = fs->dev_desc->log2blksz; |
91 | ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz); | |
ed34f34d | 92 | |
50ce4c07 | 93 | startblock = off >> log2blksz; |
ed34f34d | 94 | startblock += part_offset; |
50ce4c07 | 95 | remainder = off & (uint64_t)(fs->dev_desc->blksz - 1); |
ed34f34d US |
96 | |
97 | if (fs->dev_desc == NULL) | |
98 | return; | |
99 | ||
50ce4c07 | 100 | if ((startblock + (size >> log2blksz)) > |
ed34f34d | 101 | (part_offset + fs->total_sect)) { |
04735e9c | 102 | printf("part_offset is " LBAFU "\n", part_offset); |
aac618a3 | 103 | printf("total_sector is %" PRIu64 "\n", fs->total_sect); |
ed34f34d US |
104 | printf("error: overflow occurs\n"); |
105 | return; | |
106 | } | |
107 | ||
108 | if (remainder) { | |
2a981dc2 SG |
109 | blk_dread(fs->dev_desc, startblock, 1, sec_buf); |
110 | temp_ptr = sec_buf; | |
111 | memcpy((temp_ptr + remainder), (unsigned char *)buf, size); | |
112 | blk_dwrite(fs->dev_desc, startblock, 1, sec_buf); | |
ed34f34d | 113 | } else { |
50ce4c07 | 114 | if (size >> log2blksz != 0) { |
2a981dc2 SG |
115 | blk_dwrite(fs->dev_desc, startblock, size >> log2blksz, |
116 | (unsigned long *)buf); | |
ed34f34d | 117 | } else { |
2a981dc2 | 118 | blk_dread(fs->dev_desc, startblock, 1, sec_buf); |
ed34f34d US |
119 | temp_ptr = sec_buf; |
120 | memcpy(temp_ptr, buf, size); | |
2a981dc2 SG |
121 | blk_dwrite(fs->dev_desc, startblock, 1, |
122 | (unsigned long *)sec_buf); | |
ed34f34d US |
123 | } |
124 | } | |
125 | } | |
126 | ||
127 | static int _get_new_inode_no(unsigned char *buffer) | |
128 | { | |
129 | struct ext_filesystem *fs = get_fs(); | |
130 | unsigned char input; | |
131 | int operand, status; | |
132 | int count = 1; | |
133 | int j = 0; | |
134 | ||
135 | /* get the blocksize of the filesystem */ | |
136 | unsigned char *ptr = buffer; | |
137 | while (*ptr == 255) { | |
138 | ptr++; | |
139 | count += 8; | |
58a9ecba | 140 | if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group)) |
ed34f34d US |
141 | return -1; |
142 | } | |
143 | ||
144 | for (j = 0; j < fs->blksz; j++) { | |
145 | input = *ptr; | |
146 | int i = 0; | |
147 | while (i <= 7) { | |
148 | operand = 1 << i; | |
149 | status = input & operand; | |
150 | if (status) { | |
151 | i++; | |
152 | count++; | |
153 | } else { | |
154 | *ptr |= operand; | |
155 | return count; | |
156 | } | |
157 | } | |
158 | ptr = ptr + 1; | |
159 | } | |
160 | ||
161 | return -1; | |
162 | } | |
163 | ||
164 | static int _get_new_blk_no(unsigned char *buffer) | |
165 | { | |
166 | unsigned char input; | |
167 | int operand, status; | |
168 | int count = 0; | |
169 | int j = 0; | |
170 | unsigned char *ptr = buffer; | |
171 | struct ext_filesystem *fs = get_fs(); | |
172 | ||
173 | if (fs->blksz != 1024) | |
174 | count = 0; | |
175 | else | |
176 | count = 1; | |
177 | ||
178 | while (*ptr == 255) { | |
179 | ptr++; | |
180 | count += 8; | |
181 | if (count == (fs->blksz * 8)) | |
182 | return -1; | |
183 | } | |
184 | ||
185 | for (j = 0; j < fs->blksz; j++) { | |
186 | input = *ptr; | |
187 | int i = 0; | |
188 | while (i <= 7) { | |
189 | operand = 1 << i; | |
190 | status = input & operand; | |
191 | if (status) { | |
192 | i++; | |
193 | count++; | |
194 | } else { | |
195 | *ptr |= operand; | |
196 | return count; | |
197 | } | |
198 | } | |
199 | ptr = ptr + 1; | |
200 | } | |
201 | ||
202 | return -1; | |
203 | } | |
204 | ||
205 | int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index) | |
206 | { | |
207 | int i, remainder, status; | |
208 | unsigned char *ptr = buffer; | |
209 | unsigned char operand; | |
210 | i = blockno / 8; | |
211 | remainder = blockno % 8; | |
212 | int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); | |
213 | ||
214 | i = i - (index * blocksize); | |
215 | if (blocksize != 1024) { | |
216 | ptr = ptr + i; | |
217 | operand = 1 << remainder; | |
218 | status = *ptr & operand; | |
219 | if (status) | |
220 | return -1; | |
221 | ||
222 | *ptr = *ptr | operand; | |
223 | return 0; | |
224 | } else { | |
225 | if (remainder == 0) { | |
226 | ptr = ptr + i - 1; | |
227 | operand = (1 << 7); | |
228 | } else { | |
229 | ptr = ptr + i; | |
230 | operand = (1 << (remainder - 1)); | |
231 | } | |
232 | status = *ptr & operand; | |
233 | if (status) | |
234 | return -1; | |
235 | ||
236 | *ptr = *ptr | operand; | |
237 | return 0; | |
238 | } | |
239 | } | |
240 | ||
241 | void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index) | |
242 | { | |
243 | int i, remainder, status; | |
244 | unsigned char *ptr = buffer; | |
245 | unsigned char operand; | |
246 | i = blockno / 8; | |
247 | remainder = blockno % 8; | |
248 | int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); | |
249 | ||
250 | i = i - (index * blocksize); | |
251 | if (blocksize != 1024) { | |
252 | ptr = ptr + i; | |
253 | operand = (1 << remainder); | |
254 | status = *ptr & operand; | |
255 | if (status) | |
256 | *ptr = *ptr & ~(operand); | |
257 | } else { | |
258 | if (remainder == 0) { | |
259 | ptr = ptr + i - 1; | |
260 | operand = (1 << 7); | |
261 | } else { | |
262 | ptr = ptr + i; | |
263 | operand = (1 << (remainder - 1)); | |
264 | } | |
265 | status = *ptr & operand; | |
266 | if (status) | |
267 | *ptr = *ptr & ~(operand); | |
268 | } | |
269 | } | |
270 | ||
271 | int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index) | |
272 | { | |
273 | int i, remainder, status; | |
274 | unsigned char *ptr = buffer; | |
275 | unsigned char operand; | |
276 | ||
58a9ecba | 277 | inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); |
ed34f34d US |
278 | i = inode_no / 8; |
279 | remainder = inode_no % 8; | |
280 | if (remainder == 0) { | |
281 | ptr = ptr + i - 1; | |
282 | operand = (1 << 7); | |
283 | } else { | |
284 | ptr = ptr + i; | |
285 | operand = (1 << (remainder - 1)); | |
286 | } | |
287 | status = *ptr & operand; | |
288 | if (status) | |
289 | return -1; | |
290 | ||
291 | *ptr = *ptr | operand; | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index) | |
297 | { | |
298 | int i, remainder, status; | |
299 | unsigned char *ptr = buffer; | |
300 | unsigned char operand; | |
301 | ||
58a9ecba | 302 | inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); |
ed34f34d US |
303 | i = inode_no / 8; |
304 | remainder = inode_no % 8; | |
305 | if (remainder == 0) { | |
306 | ptr = ptr + i - 1; | |
307 | operand = (1 << 7); | |
308 | } else { | |
309 | ptr = ptr + i; | |
310 | operand = (1 << (remainder - 1)); | |
311 | } | |
312 | status = *ptr & operand; | |
313 | if (status) | |
314 | *ptr = *ptr & ~(operand); | |
315 | } | |
316 | ||
58a9ecba | 317 | uint16_t ext4fs_checksum_update(uint32_t i) |
ed34f34d US |
318 | { |
319 | struct ext2_block_group *desc; | |
320 | struct ext_filesystem *fs = get_fs(); | |
58a9ecba MW |
321 | uint16_t crc = 0; |
322 | __le32 le32_i = cpu_to_le32(i); | |
ed34f34d | 323 | |
73c15c63 | 324 | desc = (struct ext2_block_group *)&fs->bgd[i]; |
58a9ecba | 325 | if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { |
ed34f34d US |
326 | int offset = offsetof(struct ext2_block_group, bg_checksum); |
327 | ||
328 | crc = ext2fs_crc16(~0, fs->sb->unique_id, | |
329 | sizeof(fs->sb->unique_id)); | |
58a9ecba | 330 | crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i)); |
ed34f34d US |
331 | crc = ext2fs_crc16(crc, desc, offset); |
332 | offset += sizeof(desc->bg_checksum); /* skip checksum */ | |
333 | assert(offset == sizeof(*desc)); | |
334 | } | |
335 | ||
336 | return crc; | |
337 | } | |
338 | ||
339 | static int check_void_in_dentry(struct ext2_dirent *dir, char *filename) | |
340 | { | |
341 | int dentry_length; | |
342 | int sizeof_void_space; | |
343 | int new_entry_byte_reqd; | |
344 | short padding_factor = 0; | |
345 | ||
346 | if (dir->namelen % 4 != 0) | |
347 | padding_factor = 4 - (dir->namelen % 4); | |
348 | ||
349 | dentry_length = sizeof(struct ext2_dirent) + | |
350 | dir->namelen + padding_factor; | |
58a9ecba | 351 | sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length; |
ed34f34d US |
352 | if (sizeof_void_space == 0) |
353 | return 0; | |
354 | ||
355 | padding_factor = 0; | |
356 | if (strlen(filename) % 4 != 0) | |
357 | padding_factor = 4 - (strlen(filename) % 4); | |
358 | ||
359 | new_entry_byte_reqd = strlen(filename) + | |
360 | sizeof(struct ext2_dirent) + padding_factor; | |
361 | if (sizeof_void_space >= new_entry_byte_reqd) { | |
58a9ecba | 362 | dir->direntlen = cpu_to_le16(dentry_length); |
ed34f34d US |
363 | return sizeof_void_space; |
364 | } | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type) | |
370 | { | |
371 | unsigned int *zero_buffer = NULL; | |
372 | char *root_first_block_buffer = NULL; | |
373 | int direct_blk_idx; | |
374 | long int root_blknr; | |
375 | long int first_block_no_of_root = 0; | |
376 | long int previous_blknr = -1; | |
377 | int totalbytes = 0; | |
378 | short int padding_factor = 0; | |
379 | unsigned int new_entry_byte_reqd; | |
380 | unsigned int last_entry_dirlen; | |
381 | int sizeof_void_space = 0; | |
382 | int templength = 0; | |
383 | int inodeno; | |
384 | int status; | |
385 | struct ext_filesystem *fs = get_fs(); | |
386 | /* directory entry */ | |
387 | struct ext2_dirent *dir; | |
ed34f34d | 388 | char *temp_dir = NULL; |
58a9ecba MW |
389 | uint32_t new_blk_no; |
390 | uint32_t new_size; | |
391 | uint32_t new_blockcnt; | |
ed34f34d US |
392 | |
393 | zero_buffer = zalloc(fs->blksz); | |
394 | if (!zero_buffer) { | |
395 | printf("No Memory\n"); | |
396 | return; | |
397 | } | |
398 | root_first_block_buffer = zalloc(fs->blksz); | |
399 | if (!root_first_block_buffer) { | |
400 | free(zero_buffer); | |
401 | printf("No Memory\n"); | |
402 | return; | |
403 | } | |
404 | restart: | |
405 | ||
406 | /* read the block no allocated to a file */ | |
407 | for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; | |
408 | direct_blk_idx++) { | |
409 | root_blknr = read_allocated_block(g_parent_inode, | |
410 | direct_blk_idx); | |
411 | if (root_blknr == 0) { | |
412 | first_block_no_of_root = previous_blknr; | |
413 | break; | |
414 | } | |
415 | previous_blknr = root_blknr; | |
416 | } | |
417 | ||
04735e9c | 418 | status = ext4fs_devread((lbaint_t)first_block_no_of_root |
ed34f34d US |
419 | * fs->sect_perblk, |
420 | 0, fs->blksz, root_first_block_buffer); | |
421 | if (status == 0) | |
422 | goto fail; | |
423 | ||
424 | if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) | |
425 | goto fail; | |
426 | dir = (struct ext2_dirent *)root_first_block_buffer; | |
ed34f34d | 427 | totalbytes = 0; |
58a9ecba | 428 | while (le16_to_cpu(dir->direntlen) > 0) { |
ed34f34d US |
429 | /* |
430 | * blocksize-totalbytes because last directory length | |
431 | * i.e. dir->direntlen is free availble space in the | |
432 | * block that means it is a last entry of directory | |
433 | * entry | |
434 | */ | |
435 | ||
436 | /* traversing the each directory entry */ | |
58a9ecba | 437 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) { |
ed34f34d US |
438 | if (strlen(filename) % 4 != 0) |
439 | padding_factor = 4 - (strlen(filename) % 4); | |
440 | ||
441 | new_entry_byte_reqd = strlen(filename) + | |
442 | sizeof(struct ext2_dirent) + padding_factor; | |
443 | padding_factor = 0; | |
444 | /* | |
445 | * update last directory entry length to its | |
446 | * length because we are creating new directory | |
447 | * entry | |
448 | */ | |
449 | if (dir->namelen % 4 != 0) | |
450 | padding_factor = 4 - (dir->namelen % 4); | |
451 | ||
452 | last_entry_dirlen = dir->namelen + | |
453 | sizeof(struct ext2_dirent) + padding_factor; | |
454 | if ((fs->blksz - totalbytes - last_entry_dirlen) < | |
455 | new_entry_byte_reqd) { | |
456 | printf("1st Block Full:Allocate new block\n"); | |
457 | ||
458 | if (direct_blk_idx == INDIRECT_BLOCKS - 1) { | |
459 | printf("Directory exceeds limit\n"); | |
460 | goto fail; | |
461 | } | |
58a9ecba MW |
462 | new_blk_no = ext4fs_get_new_blk_no(); |
463 | if (new_blk_no == -1) { | |
ed34f34d US |
464 | printf("no block left to assign\n"); |
465 | goto fail; | |
466 | } | |
58a9ecba MW |
467 | put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz); |
468 | g_parent_inode->b.blocks.dir_blocks[direct_blk_idx] = | |
469 | cpu_to_le32(new_blk_no); | |
470 | ||
471 | new_size = le32_to_cpu(g_parent_inode->size); | |
472 | new_size += fs->blksz; | |
473 | g_parent_inode->size = cpu_to_le32(new_size); | |
474 | ||
475 | new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt); | |
476 | new_blockcnt += fs->sect_perblk; | |
477 | g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt); | |
478 | ||
ed34f34d US |
479 | if (ext4fs_put_metadata |
480 | (root_first_block_buffer, | |
481 | first_block_no_of_root)) | |
482 | goto fail; | |
483 | goto restart; | |
484 | } | |
58a9ecba | 485 | dir->direntlen = cpu_to_le16(last_entry_dirlen); |
ed34f34d US |
486 | break; |
487 | } | |
488 | ||
58a9ecba | 489 | templength = le16_to_cpu(dir->direntlen); |
ed34f34d US |
490 | totalbytes = totalbytes + templength; |
491 | sizeof_void_space = check_void_in_dentry(dir, filename); | |
492 | if (sizeof_void_space) | |
493 | break; | |
494 | ||
495 | dir = (struct ext2_dirent *)((char *)dir + templength); | |
ed34f34d US |
496 | } |
497 | ||
498 | /* make a pointer ready for creating next directory entry */ | |
58a9ecba | 499 | templength = le16_to_cpu(dir->direntlen); |
ed34f34d US |
500 | totalbytes = totalbytes + templength; |
501 | dir = (struct ext2_dirent *)((char *)dir + templength); | |
ed34f34d US |
502 | |
503 | /* get the next available inode number */ | |
504 | inodeno = ext4fs_get_new_inode_no(); | |
505 | if (inodeno == -1) { | |
506 | printf("no inode left to assign\n"); | |
507 | goto fail; | |
508 | } | |
58a9ecba | 509 | dir->inode = cpu_to_le32(inodeno); |
ed34f34d | 510 | if (sizeof_void_space) |
58a9ecba | 511 | dir->direntlen = cpu_to_le16(sizeof_void_space); |
ed34f34d | 512 | else |
58a9ecba | 513 | dir->direntlen = cpu_to_le16(fs->blksz - totalbytes); |
ed34f34d US |
514 | |
515 | dir->namelen = strlen(filename); | |
516 | dir->filetype = FILETYPE_REG; /* regular file */ | |
517 | temp_dir = (char *)dir; | |
518 | temp_dir = temp_dir + sizeof(struct ext2_dirent); | |
519 | memcpy(temp_dir, filename, strlen(filename)); | |
520 | ||
521 | *p_ino = inodeno; | |
522 | ||
523 | /* update or write the 1st block of root inode */ | |
524 | if (ext4fs_put_metadata(root_first_block_buffer, | |
525 | first_block_no_of_root)) | |
526 | goto fail; | |
527 | ||
528 | fail: | |
529 | free(zero_buffer); | |
530 | free(root_first_block_buffer); | |
531 | } | |
532 | ||
533 | static int search_dir(struct ext2_inode *parent_inode, char *dirname) | |
534 | { | |
535 | int status; | |
536 | int inodeno; | |
537 | int totalbytes; | |
538 | int templength; | |
539 | int direct_blk_idx; | |
540 | long int blknr; | |
541 | int found = 0; | |
542 | char *ptr = NULL; | |
543 | unsigned char *block_buffer = NULL; | |
544 | struct ext2_dirent *dir = NULL; | |
545 | struct ext2_dirent *previous_dir = NULL; | |
546 | struct ext_filesystem *fs = get_fs(); | |
547 | ||
548 | /* read the block no allocated to a file */ | |
549 | for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; | |
550 | direct_blk_idx++) { | |
551 | blknr = read_allocated_block(parent_inode, direct_blk_idx); | |
552 | if (blknr == 0) | |
553 | goto fail; | |
554 | ||
555 | /* read the blocks of parenet inode */ | |
556 | block_buffer = zalloc(fs->blksz); | |
557 | if (!block_buffer) | |
558 | goto fail; | |
559 | ||
04735e9c | 560 | status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, |
ed34f34d US |
561 | 0, fs->blksz, (char *)block_buffer); |
562 | if (status == 0) | |
563 | goto fail; | |
564 | ||
565 | dir = (struct ext2_dirent *)block_buffer; | |
566 | ptr = (char *)dir; | |
567 | totalbytes = 0; | |
58a9ecba | 568 | while (le16_to_cpu(dir->direntlen) >= 0) { |
ed34f34d US |
569 | /* |
570 | * blocksize-totalbytes because last directory | |
571 | * length i.e.,*dir->direntlen is free availble | |
572 | * space in the block that means | |
573 | * it is a last entry of directory entry | |
574 | */ | |
575 | if (strlen(dirname) == dir->namelen) { | |
58a9ecba MW |
576 | if (strncmp(dirname, ptr + sizeof(struct ext2_dirent), dir->namelen) == 0) { |
577 | uint16_t new_len; | |
578 | new_len = le16_to_cpu(previous_dir->direntlen); | |
579 | new_len += le16_to_cpu(dir->direntlen); | |
580 | previous_dir->direntlen = cpu_to_le16(new_len); | |
581 | inodeno = le32_to_cpu(dir->inode); | |
ed34f34d US |
582 | dir->inode = 0; |
583 | found = 1; | |
584 | break; | |
585 | } | |
586 | } | |
587 | ||
58a9ecba | 588 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) |
ed34f34d US |
589 | break; |
590 | ||
591 | /* traversing the each directory entry */ | |
58a9ecba | 592 | templength = le16_to_cpu(dir->direntlen); |
ed34f34d US |
593 | totalbytes = totalbytes + templength; |
594 | previous_dir = dir; | |
595 | dir = (struct ext2_dirent *)((char *)dir + templength); | |
596 | ptr = (char *)dir; | |
597 | } | |
598 | ||
599 | if (found == 1) { | |
600 | free(block_buffer); | |
601 | block_buffer = NULL; | |
602 | return inodeno; | |
603 | } | |
604 | ||
605 | free(block_buffer); | |
606 | block_buffer = NULL; | |
607 | } | |
608 | ||
609 | fail: | |
610 | free(block_buffer); | |
611 | ||
612 | return -1; | |
613 | } | |
614 | ||
615 | static int find_dir_depth(char *dirname) | |
616 | { | |
617 | char *token = strtok(dirname, "/"); | |
618 | int count = 0; | |
619 | while (token != NULL) { | |
620 | token = strtok(NULL, "/"); | |
621 | count++; | |
622 | } | |
623 | return count + 1 + 1; | |
624 | /* | |
625 | * for example for string /home/temp | |
626 | * depth=home(1)+temp(1)+1 extra for NULL; | |
627 | * so count is 4; | |
628 | */ | |
629 | } | |
630 | ||
631 | static int parse_path(char **arr, char *dirname) | |
632 | { | |
633 | char *token = strtok(dirname, "/"); | |
634 | int i = 0; | |
635 | ||
636 | /* add root */ | |
637 | arr[i] = zalloc(strlen("/") + 1); | |
638 | if (!arr[i]) | |
639 | return -ENOMEM; | |
934b14f2 | 640 | memcpy(arr[i++], "/", strlen("/")); |
ed34f34d US |
641 | |
642 | /* add each path entry after root */ | |
643 | while (token != NULL) { | |
644 | arr[i] = zalloc(strlen(token) + 1); | |
645 | if (!arr[i]) | |
646 | return -ENOMEM; | |
647 | memcpy(arr[i++], token, strlen(token)); | |
648 | token = strtok(NULL, "/"); | |
649 | } | |
650 | arr[i] = NULL; | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
655 | int ext4fs_iget(int inode_no, struct ext2_inode *inode) | |
656 | { | |
657 | if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) | |
658 | return -1; | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | /* | |
664 | * Function: ext4fs_get_parent_inode_num | |
665 | * Return Value: inode Number of the parent directory of file/Directory to be | |
666 | * created | |
667 | * dirname : Input parmater, input path name of the file/directory to be created | |
668 | * dname : Output parameter, to be filled with the name of the directory | |
669 | * extracted from dirname | |
670 | */ | |
671 | int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) | |
672 | { | |
673 | int i; | |
674 | int depth = 0; | |
675 | int matched_inode_no; | |
676 | int result_inode_no = -1; | |
677 | char **ptr = NULL; | |
678 | char *depth_dirname = NULL; | |
679 | char *parse_dirname = NULL; | |
680 | struct ext2_inode *parent_inode = NULL; | |
681 | struct ext2_inode *first_inode = NULL; | |
682 | struct ext2_inode temp_inode; | |
683 | ||
684 | if (*dirname != '/') { | |
685 | printf("Please supply Absolute path\n"); | |
686 | return -1; | |
687 | } | |
688 | ||
689 | /* TODO: input validation make equivalent to linux */ | |
690 | depth_dirname = zalloc(strlen(dirname) + 1); | |
691 | if (!depth_dirname) | |
692 | return -ENOMEM; | |
693 | ||
694 | memcpy(depth_dirname, dirname, strlen(dirname)); | |
695 | depth = find_dir_depth(depth_dirname); | |
696 | parse_dirname = zalloc(strlen(dirname) + 1); | |
697 | if (!parse_dirname) | |
698 | goto fail; | |
699 | memcpy(parse_dirname, dirname, strlen(dirname)); | |
700 | ||
701 | /* allocate memory for each directory level */ | |
702 | ptr = zalloc((depth) * sizeof(char *)); | |
703 | if (!ptr) | |
704 | goto fail; | |
705 | if (parse_path(ptr, parse_dirname)) | |
706 | goto fail; | |
707 | parent_inode = zalloc(sizeof(struct ext2_inode)); | |
708 | if (!parent_inode) | |
709 | goto fail; | |
710 | first_inode = zalloc(sizeof(struct ext2_inode)); | |
711 | if (!first_inode) | |
712 | goto fail; | |
713 | memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); | |
714 | memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); | |
715 | if (flags & F_FILE) | |
716 | result_inode_no = EXT2_ROOT_INO; | |
717 | for (i = 1; i < depth; i++) { | |
718 | matched_inode_no = search_dir(parent_inode, ptr[i]); | |
719 | if (matched_inode_no == -1) { | |
720 | if (ptr[i + 1] == NULL && i == 1) { | |
721 | result_inode_no = EXT2_ROOT_INO; | |
722 | goto end; | |
723 | } else { | |
724 | if (ptr[i + 1] == NULL) | |
725 | break; | |
726 | printf("Invalid path\n"); | |
727 | result_inode_no = -1; | |
728 | goto fail; | |
729 | } | |
730 | } else { | |
731 | if (ptr[i + 1] != NULL) { | |
732 | memset(parent_inode, '\0', | |
733 | sizeof(struct ext2_inode)); | |
734 | if (ext4fs_iget(matched_inode_no, | |
735 | parent_inode)) { | |
736 | result_inode_no = -1; | |
737 | goto fail; | |
738 | } | |
739 | result_inode_no = matched_inode_no; | |
740 | } else { | |
741 | break; | |
742 | } | |
743 | } | |
744 | } | |
745 | ||
746 | end: | |
747 | if (i == 1) | |
748 | matched_inode_no = search_dir(first_inode, ptr[i]); | |
749 | else | |
750 | matched_inode_no = search_dir(parent_inode, ptr[i]); | |
751 | ||
752 | if (matched_inode_no != -1) { | |
753 | ext4fs_iget(matched_inode_no, &temp_inode); | |
58a9ecba | 754 | if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { |
ed34f34d US |
755 | printf("It is a Directory\n"); |
756 | result_inode_no = -1; | |
757 | goto fail; | |
758 | } | |
759 | } | |
760 | ||
761 | if (strlen(ptr[i]) > 256) { | |
762 | result_inode_no = -1; | |
763 | goto fail; | |
764 | } | |
765 | memcpy(dname, ptr[i], strlen(ptr[i])); | |
766 | ||
767 | fail: | |
768 | free(depth_dirname); | |
769 | free(parse_dirname); | |
934b14f2 SW |
770 | for (i = 0; i < depth; i++) { |
771 | if (!ptr[i]) | |
772 | break; | |
773 | free(ptr[i]); | |
774 | } | |
ed34f34d US |
775 | free(ptr); |
776 | free(parent_inode); | |
777 | free(first_inode); | |
778 | ||
779 | return result_inode_no; | |
780 | } | |
781 | ||
782 | static int check_filename(char *filename, unsigned int blknr) | |
783 | { | |
784 | unsigned int first_block_no_of_root; | |
785 | int totalbytes = 0; | |
786 | int templength = 0; | |
787 | int status, inodeno; | |
788 | int found = 0; | |
789 | char *root_first_block_buffer = NULL; | |
790 | char *root_first_block_addr = NULL; | |
791 | struct ext2_dirent *dir = NULL; | |
792 | struct ext2_dirent *previous_dir = NULL; | |
793 | char *ptr = NULL; | |
794 | struct ext_filesystem *fs = get_fs(); | |
d56b2015 | 795 | int ret = -1; |
ed34f34d US |
796 | |
797 | /* get the first block of root */ | |
798 | first_block_no_of_root = blknr; | |
799 | root_first_block_buffer = zalloc(fs->blksz); | |
800 | if (!root_first_block_buffer) | |
801 | return -ENOMEM; | |
802 | root_first_block_addr = root_first_block_buffer; | |
04735e9c | 803 | status = ext4fs_devread((lbaint_t)first_block_no_of_root * |
ed34f34d US |
804 | fs->sect_perblk, 0, |
805 | fs->blksz, root_first_block_buffer); | |
806 | if (status == 0) | |
807 | goto fail; | |
808 | ||
809 | if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) | |
810 | goto fail; | |
811 | dir = (struct ext2_dirent *)root_first_block_buffer; | |
812 | ptr = (char *)dir; | |
813 | totalbytes = 0; | |
58a9ecba | 814 | while (le16_to_cpu(dir->direntlen) >= 0) { |
ed34f34d US |
815 | /* |
816 | * blocksize-totalbytes because last | |
817 | * directory length i.e., *dir->direntlen | |
818 | * is free availble space in the block that | |
819 | * means it is a last entry of directory entry | |
820 | */ | |
821 | if (strlen(filename) == dir->namelen) { | |
822 | if (strncmp(filename, ptr + sizeof(struct ext2_dirent), | |
823 | dir->namelen) == 0) { | |
58a9ecba | 824 | uint16_t new_len; |
ed34f34d | 825 | printf("file found deleting\n"); |
58a9ecba MW |
826 | new_len = le16_to_cpu(previous_dir->direntlen); |
827 | new_len += le16_to_cpu(dir->direntlen); | |
828 | previous_dir->direntlen = cpu_to_le16(new_len); | |
829 | inodeno = le32_to_cpu(dir->inode); | |
ed34f34d US |
830 | dir->inode = 0; |
831 | found = 1; | |
832 | break; | |
833 | } | |
834 | } | |
835 | ||
58a9ecba | 836 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) |
ed34f34d US |
837 | break; |
838 | ||
839 | /* traversing the each directory entry */ | |
58a9ecba | 840 | templength = le16_to_cpu(dir->direntlen); |
ed34f34d US |
841 | totalbytes = totalbytes + templength; |
842 | previous_dir = dir; | |
843 | dir = (struct ext2_dirent *)((char *)dir + templength); | |
844 | ptr = (char *)dir; | |
845 | } | |
846 | ||
847 | ||
848 | if (found == 1) { | |
849 | if (ext4fs_put_metadata(root_first_block_addr, | |
850 | first_block_no_of_root)) | |
851 | goto fail; | |
d56b2015 | 852 | ret = inodeno; |
ed34f34d US |
853 | } |
854 | fail: | |
855 | free(root_first_block_buffer); | |
856 | ||
d56b2015 | 857 | return ret; |
ed34f34d US |
858 | } |
859 | ||
860 | int ext4fs_filename_check(char *filename) | |
861 | { | |
862 | short direct_blk_idx = 0; | |
863 | long int blknr = -1; | |
864 | int inodeno = -1; | |
865 | ||
866 | /* read the block no allocated to a file */ | |
867 | for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; | |
868 | direct_blk_idx++) { | |
869 | blknr = read_allocated_block(g_parent_inode, direct_blk_idx); | |
870 | if (blknr == 0) | |
871 | break; | |
872 | inodeno = check_filename(filename, blknr); | |
873 | if (inodeno != -1) | |
874 | return inodeno; | |
875 | } | |
876 | ||
877 | return -1; | |
878 | } | |
879 | ||
58a9ecba | 880 | uint32_t ext4fs_get_new_blk_no(void) |
ed34f34d US |
881 | { |
882 | short i; | |
883 | short status; | |
884 | int remainder; | |
885 | unsigned int bg_idx; | |
886 | static int prev_bg_bitmap_index = -1; | |
58a9ecba | 887 | unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); |
ed34f34d US |
888 | struct ext_filesystem *fs = get_fs(); |
889 | char *journal_buffer = zalloc(fs->blksz); | |
890 | char *zero_buffer = zalloc(fs->blksz); | |
891 | if (!journal_buffer || !zero_buffer) | |
892 | goto fail; | |
73c15c63 | 893 | struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; |
ed34f34d US |
894 | |
895 | if (fs->first_pass_bbmap == 0) { | |
896 | for (i = 0; i < fs->no_blkgrp; i++) { | |
58a9ecba MW |
897 | if (le16_to_cpu(bgd[i].free_blocks)) { |
898 | if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_BLOCK_UNINIT) { | |
899 | uint16_t new_flags; | |
900 | put_ext4((uint64_t)le32_to_cpu(bgd[i].block_id) * fs->blksz, | |
ed34f34d | 901 | zero_buffer, fs->blksz); |
58a9ecba MW |
902 | new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_BLOCK_UNINIT; |
903 | bgd[i].bg_flags = cpu_to_le16(new_flags); | |
ed34f34d US |
904 | memcpy(fs->blk_bmaps[i], zero_buffer, |
905 | fs->blksz); | |
906 | } | |
907 | fs->curr_blkno = | |
908 | _get_new_blk_no(fs->blk_bmaps[i]); | |
909 | if (fs->curr_blkno == -1) | |
910 | /* if block bitmap is completely fill */ | |
911 | continue; | |
912 | fs->curr_blkno = fs->curr_blkno + | |
913 | (i * fs->blksz * 8); | |
914 | fs->first_pass_bbmap++; | |
58a9ecba MW |
915 | ext4fs_bg_free_blocks_dec(&bgd[i]); |
916 | ext4fs_sb_free_blocks_dec(fs->sb); | |
917 | status = ext4fs_devread( | |
918 | (lbaint_t)le32_to_cpu(bgd[i].block_id) * | |
ed34f34d US |
919 | fs->sect_perblk, 0, |
920 | fs->blksz, | |
921 | journal_buffer); | |
922 | if (status == 0) | |
923 | goto fail; | |
924 | if (ext4fs_log_journal(journal_buffer, | |
58a9ecba | 925 | le32_to_cpu(bgd[i].block_id))) |
ed34f34d US |
926 | goto fail; |
927 | goto success; | |
928 | } else { | |
929 | debug("no space left on block group %d\n", i); | |
930 | } | |
931 | } | |
932 | ||
933 | goto fail; | |
934 | } else { | |
935 | restart: | |
936 | fs->curr_blkno++; | |
937 | /* get the blockbitmap index respective to blockno */ | |
35dd055b ŁM |
938 | bg_idx = fs->curr_blkno / blk_per_grp; |
939 | if (fs->blksz == 1024) { | |
ed34f34d US |
940 | remainder = fs->curr_blkno % blk_per_grp; |
941 | if (!remainder) | |
942 | bg_idx--; | |
943 | } | |
944 | ||
945 | /* | |
946 | * To skip completely filled block group bitmaps | |
947 | * Optimize the block allocation | |
948 | */ | |
949 | if (bg_idx >= fs->no_blkgrp) | |
950 | goto fail; | |
951 | ||
73c15c63 | 952 | if (bgd[bg_idx].free_blocks == 0) { |
ed34f34d US |
953 | debug("block group %u is full. Skipping\n", bg_idx); |
954 | fs->curr_blkno = fs->curr_blkno + blk_per_grp; | |
955 | fs->curr_blkno--; | |
956 | goto restart; | |
957 | } | |
958 | ||
58a9ecba MW |
959 | if (le16_to_cpu(bgd[bg_idx].bg_flags) & EXT4_BG_BLOCK_UNINIT) { |
960 | uint16_t new_flags; | |
ed34f34d | 961 | memset(zero_buffer, '\0', fs->blksz); |
58a9ecba MW |
962 | put_ext4((uint64_t)le32_to_cpu(bgd[bg_idx].block_id) * fs->blksz, |
963 | zero_buffer, fs->blksz); | |
ed34f34d | 964 | memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); |
58a9ecba MW |
965 | new_flags = le16_to_cpu(bgd[bg_idx].bg_flags) & ~EXT4_BG_BLOCK_UNINIT; |
966 | bgd[bg_idx].bg_flags = cpu_to_le16(new_flags); | |
ed34f34d US |
967 | } |
968 | ||
969 | if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], | |
970 | bg_idx) != 0) { | |
971 | debug("going for restart for the block no %ld %u\n", | |
972 | fs->curr_blkno, bg_idx); | |
973 | goto restart; | |
974 | } | |
975 | ||
976 | /* journal backup */ | |
977 | if (prev_bg_bitmap_index != bg_idx) { | |
978 | memset(journal_buffer, '\0', fs->blksz); | |
58a9ecba MW |
979 | status = ext4fs_devread( |
980 | (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) | |
ed34f34d US |
981 | * fs->sect_perblk, |
982 | 0, fs->blksz, journal_buffer); | |
983 | if (status == 0) | |
984 | goto fail; | |
985 | if (ext4fs_log_journal(journal_buffer, | |
58a9ecba | 986 | le32_to_cpu(bgd[bg_idx].block_id))) |
ed34f34d US |
987 | goto fail; |
988 | ||
989 | prev_bg_bitmap_index = bg_idx; | |
990 | } | |
58a9ecba MW |
991 | ext4fs_bg_free_blocks_dec(&bgd[bg_idx]); |
992 | ext4fs_sb_free_blocks_dec(fs->sb); | |
ed34f34d US |
993 | goto success; |
994 | } | |
995 | success: | |
996 | free(journal_buffer); | |
997 | free(zero_buffer); | |
998 | ||
999 | return fs->curr_blkno; | |
1000 | fail: | |
1001 | free(journal_buffer); | |
1002 | free(zero_buffer); | |
1003 | ||
1004 | return -1; | |
1005 | } | |
1006 | ||
1007 | int ext4fs_get_new_inode_no(void) | |
1008 | { | |
1009 | short i; | |
1010 | short status; | |
1011 | unsigned int ibmap_idx; | |
1012 | static int prev_inode_bitmap_index = -1; | |
58a9ecba | 1013 | unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); |
ed34f34d US |
1014 | struct ext_filesystem *fs = get_fs(); |
1015 | char *journal_buffer = zalloc(fs->blksz); | |
1016 | char *zero_buffer = zalloc(fs->blksz); | |
1017 | if (!journal_buffer || !zero_buffer) | |
1018 | goto fail; | |
73c15c63 | 1019 | struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; |
ed34f34d US |
1020 | |
1021 | if (fs->first_pass_ibmap == 0) { | |
1022 | for (i = 0; i < fs->no_blkgrp; i++) { | |
73c15c63 SG |
1023 | if (bgd[i].free_inodes) { |
1024 | if (bgd[i].bg_itable_unused != | |
1025 | bgd[i].free_inodes) | |
1026 | bgd[i].bg_itable_unused = | |
1027 | bgd[i].free_inodes; | |
58a9ecba MW |
1028 | if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_INODE_UNINIT) { |
1029 | int new_flags; | |
1030 | put_ext4((uint64_t)le32_to_cpu(bgd[i].inode_id) * fs->blksz, | |
ed34f34d | 1031 | zero_buffer, fs->blksz); |
58a9ecba MW |
1032 | new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_INODE_UNINIT; |
1033 | bgd[i].bg_flags = cpu_to_le16(new_flags); | |
ed34f34d US |
1034 | memcpy(fs->inode_bmaps[i], |
1035 | zero_buffer, fs->blksz); | |
1036 | } | |
1037 | fs->curr_inode_no = | |
1038 | _get_new_inode_no(fs->inode_bmaps[i]); | |
1039 | if (fs->curr_inode_no == -1) | |
1040 | /* if block bitmap is completely fill */ | |
1041 | continue; | |
1042 | fs->curr_inode_no = fs->curr_inode_no + | |
1043 | (i * inodes_per_grp); | |
1044 | fs->first_pass_ibmap++; | |
58a9ecba MW |
1045 | ext4fs_bg_free_inodes_dec(&bgd[i]); |
1046 | ext4fs_bg_itable_unused_dec(&bgd[i]); | |
1047 | ext4fs_sb_free_inodes_dec(fs->sb); | |
1048 | status = ext4fs_devread( | |
1049 | (lbaint_t)le32_to_cpu(bgd[i].inode_id) * | |
ed34f34d US |
1050 | fs->sect_perblk, 0, |
1051 | fs->blksz, | |
1052 | journal_buffer); | |
1053 | if (status == 0) | |
1054 | goto fail; | |
1055 | if (ext4fs_log_journal(journal_buffer, | |
58a9ecba | 1056 | le32_to_cpu(bgd[i].inode_id))) |
ed34f34d US |
1057 | goto fail; |
1058 | goto success; | |
1059 | } else | |
1060 | debug("no inode left on block group %d\n", i); | |
1061 | } | |
1062 | goto fail; | |
1063 | } else { | |
1064 | restart: | |
1065 | fs->curr_inode_no++; | |
1066 | /* get the blockbitmap index respective to blockno */ | |
1067 | ibmap_idx = fs->curr_inode_no / inodes_per_grp; | |
58a9ecba MW |
1068 | if (le16_to_cpu(bgd[ibmap_idx].bg_flags) & EXT4_BG_INODE_UNINIT) { |
1069 | int new_flags; | |
ed34f34d | 1070 | memset(zero_buffer, '\0', fs->blksz); |
58a9ecba MW |
1071 | put_ext4((uint64_t)le32_to_cpu(bgd[ibmap_idx].inode_id) * fs->blksz, |
1072 | zero_buffer, fs->blksz); | |
1073 | new_flags = le16_to_cpu(bgd[ibmap_idx].bg_flags) & ~EXT4_BG_INODE_UNINIT; | |
1074 | bgd[ibmap_idx].bg_flags = cpu_to_le16(new_flags); | |
ed34f34d US |
1075 | memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, |
1076 | fs->blksz); | |
1077 | } | |
1078 | ||
1079 | if (ext4fs_set_inode_bmap(fs->curr_inode_no, | |
1080 | fs->inode_bmaps[ibmap_idx], | |
1081 | ibmap_idx) != 0) { | |
1082 | debug("going for restart for the block no %d %u\n", | |
1083 | fs->curr_inode_no, ibmap_idx); | |
1084 | goto restart; | |
1085 | } | |
1086 | ||
1087 | /* journal backup */ | |
1088 | if (prev_inode_bitmap_index != ibmap_idx) { | |
1089 | memset(journal_buffer, '\0', fs->blksz); | |
58a9ecba MW |
1090 | status = ext4fs_devread( |
1091 | (lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id) | |
ed34f34d US |
1092 | * fs->sect_perblk, |
1093 | 0, fs->blksz, journal_buffer); | |
1094 | if (status == 0) | |
1095 | goto fail; | |
1096 | if (ext4fs_log_journal(journal_buffer, | |
58a9ecba | 1097 | le32_to_cpu(bgd[ibmap_idx].inode_id))) |
ed34f34d US |
1098 | goto fail; |
1099 | prev_inode_bitmap_index = ibmap_idx; | |
1100 | } | |
73c15c63 SG |
1101 | if (bgd[ibmap_idx].bg_itable_unused != |
1102 | bgd[ibmap_idx].free_inodes) | |
1103 | bgd[ibmap_idx].bg_itable_unused = | |
1104 | bgd[ibmap_idx].free_inodes; | |
58a9ecba MW |
1105 | ext4fs_bg_free_inodes_dec(&bgd[ibmap_idx]); |
1106 | ext4fs_bg_itable_unused_dec(&bgd[ibmap_idx]); | |
1107 | ext4fs_sb_free_inodes_dec(fs->sb); | |
ed34f34d US |
1108 | goto success; |
1109 | } | |
1110 | ||
1111 | success: | |
1112 | free(journal_buffer); | |
1113 | free(zero_buffer); | |
1114 | ||
1115 | return fs->curr_inode_no; | |
1116 | fail: | |
1117 | free(journal_buffer); | |
1118 | free(zero_buffer); | |
1119 | ||
1120 | return -1; | |
1121 | ||
1122 | } | |
1123 | ||
1124 | ||
1125 | static void alloc_single_indirect_block(struct ext2_inode *file_inode, | |
1126 | unsigned int *total_remaining_blocks, | |
1127 | unsigned int *no_blks_reqd) | |
1128 | { | |
1129 | short i; | |
1130 | short status; | |
1131 | long int actual_block_no; | |
1132 | long int si_blockno; | |
1133 | /* si :single indirect */ | |
58a9ecba MW |
1134 | __le32 *si_buffer = NULL; |
1135 | __le32 *si_start_addr = NULL; | |
ed34f34d US |
1136 | struct ext_filesystem *fs = get_fs(); |
1137 | ||
1138 | if (*total_remaining_blocks != 0) { | |
1139 | si_buffer = zalloc(fs->blksz); | |
1140 | if (!si_buffer) { | |
1141 | printf("No Memory\n"); | |
1142 | return; | |
1143 | } | |
1144 | si_start_addr = si_buffer; | |
1145 | si_blockno = ext4fs_get_new_blk_no(); | |
1146 | if (si_blockno == -1) { | |
1147 | printf("no block left to assign\n"); | |
1148 | goto fail; | |
1149 | } | |
1150 | (*no_blks_reqd)++; | |
1151 | debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); | |
1152 | ||
04735e9c | 1153 | status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, |
ed34f34d US |
1154 | 0, fs->blksz, (char *)si_buffer); |
1155 | memset(si_buffer, '\0', fs->blksz); | |
1156 | if (status == 0) | |
1157 | goto fail; | |
1158 | ||
1159 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { | |
1160 | actual_block_no = ext4fs_get_new_blk_no(); | |
1161 | if (actual_block_no == -1) { | |
1162 | printf("no block left to assign\n"); | |
1163 | goto fail; | |
1164 | } | |
58a9ecba | 1165 | *si_buffer = cpu_to_le32(actual_block_no); |
ed34f34d US |
1166 | debug("SIAB %u: %u\n", *si_buffer, |
1167 | *total_remaining_blocks); | |
1168 | ||
1169 | si_buffer++; | |
1170 | (*total_remaining_blocks)--; | |
1171 | if (*total_remaining_blocks == 0) | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | /* write the block to disk */ | |
0550870b | 1176 | put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), |
ed34f34d | 1177 | si_start_addr, fs->blksz); |
58a9ecba | 1178 | file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); |
ed34f34d US |
1179 | } |
1180 | fail: | |
1181 | free(si_start_addr); | |
1182 | } | |
1183 | ||
1184 | static void alloc_double_indirect_block(struct ext2_inode *file_inode, | |
1185 | unsigned int *total_remaining_blocks, | |
1186 | unsigned int *no_blks_reqd) | |
1187 | { | |
1188 | short i; | |
1189 | short j; | |
1190 | short status; | |
1191 | long int actual_block_no; | |
1192 | /* di:double indirect */ | |
1193 | long int di_blockno_parent; | |
1194 | long int di_blockno_child; | |
58a9ecba MW |
1195 | __le32 *di_parent_buffer = NULL; |
1196 | __le32 *di_child_buff = NULL; | |
1197 | __le32 *di_block_start_addr = NULL; | |
1198 | __le32 *di_child_buff_start = NULL; | |
ed34f34d US |
1199 | struct ext_filesystem *fs = get_fs(); |
1200 | ||
1201 | if (*total_remaining_blocks != 0) { | |
1202 | /* double indirect parent block connecting to inode */ | |
1203 | di_blockno_parent = ext4fs_get_new_blk_no(); | |
1204 | if (di_blockno_parent == -1) { | |
1205 | printf("no block left to assign\n"); | |
1206 | goto fail; | |
1207 | } | |
1208 | di_parent_buffer = zalloc(fs->blksz); | |
1209 | if (!di_parent_buffer) | |
1210 | goto fail; | |
1211 | ||
1212 | di_block_start_addr = di_parent_buffer; | |
1213 | (*no_blks_reqd)++; | |
1214 | debug("DIPB %ld: %u\n", di_blockno_parent, | |
1215 | *total_remaining_blocks); | |
1216 | ||
04735e9c | 1217 | status = ext4fs_devread((lbaint_t)di_blockno_parent * |
ed34f34d US |
1218 | fs->sect_perblk, 0, |
1219 | fs->blksz, (char *)di_parent_buffer); | |
d429ca0d ŁM |
1220 | |
1221 | if (!status) { | |
1222 | printf("%s: Device read error!\n", __func__); | |
1223 | goto fail; | |
1224 | } | |
ed34f34d US |
1225 | memset(di_parent_buffer, '\0', fs->blksz); |
1226 | ||
1227 | /* | |
1228 | * start:for each double indirect parent | |
1229 | * block create one more block | |
1230 | */ | |
1231 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { | |
1232 | di_blockno_child = ext4fs_get_new_blk_no(); | |
1233 | if (di_blockno_child == -1) { | |
1234 | printf("no block left to assign\n"); | |
1235 | goto fail; | |
1236 | } | |
1237 | di_child_buff = zalloc(fs->blksz); | |
1238 | if (!di_child_buff) | |
1239 | goto fail; | |
1240 | ||
1241 | di_child_buff_start = di_child_buff; | |
58a9ecba | 1242 | *di_parent_buffer = cpu_to_le32(di_blockno_child); |
ed34f34d US |
1243 | di_parent_buffer++; |
1244 | (*no_blks_reqd)++; | |
1245 | debug("DICB %ld: %u\n", di_blockno_child, | |
1246 | *total_remaining_blocks); | |
1247 | ||
04735e9c | 1248 | status = ext4fs_devread((lbaint_t)di_blockno_child * |
ed34f34d US |
1249 | fs->sect_perblk, 0, |
1250 | fs->blksz, | |
1251 | (char *)di_child_buff); | |
d429ca0d ŁM |
1252 | |
1253 | if (!status) { | |
1254 | printf("%s: Device read error!\n", __func__); | |
1255 | goto fail; | |
1256 | } | |
ed34f34d US |
1257 | memset(di_child_buff, '\0', fs->blksz); |
1258 | /* filling of actual datablocks for each child */ | |
1259 | for (j = 0; j < (fs->blksz / sizeof(int)); j++) { | |
1260 | actual_block_no = ext4fs_get_new_blk_no(); | |
1261 | if (actual_block_no == -1) { | |
1262 | printf("no block left to assign\n"); | |
1263 | goto fail; | |
1264 | } | |
58a9ecba | 1265 | *di_child_buff = cpu_to_le32(actual_block_no); |
ed34f34d US |
1266 | debug("DIAB %ld: %u\n", actual_block_no, |
1267 | *total_remaining_blocks); | |
1268 | ||
1269 | di_child_buff++; | |
1270 | (*total_remaining_blocks)--; | |
1271 | if (*total_remaining_blocks == 0) | |
1272 | break; | |
1273 | } | |
1274 | /* write the block table */ | |
0550870b | 1275 | put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), |
ed34f34d US |
1276 | di_child_buff_start, fs->blksz); |
1277 | free(di_child_buff_start); | |
1278 | di_child_buff_start = NULL; | |
1279 | ||
1280 | if (*total_remaining_blocks == 0) | |
1281 | break; | |
1282 | } | |
0550870b | 1283 | put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), |
ed34f34d | 1284 | di_block_start_addr, fs->blksz); |
58a9ecba | 1285 | file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); |
ed34f34d US |
1286 | } |
1287 | fail: | |
1288 | free(di_block_start_addr); | |
1289 | } | |
1290 | ||
1291 | static void alloc_triple_indirect_block(struct ext2_inode *file_inode, | |
1292 | unsigned int *total_remaining_blocks, | |
1293 | unsigned int *no_blks_reqd) | |
1294 | { | |
1295 | short i; | |
1296 | short j; | |
1297 | short k; | |
1298 | long int actual_block_no; | |
1299 | /* ti: Triple Indirect */ | |
1300 | long int ti_gp_blockno; | |
1301 | long int ti_parent_blockno; | |
1302 | long int ti_child_blockno; | |
58a9ecba MW |
1303 | __le32 *ti_gp_buff = NULL; |
1304 | __le32 *ti_parent_buff = NULL; | |
1305 | __le32 *ti_child_buff = NULL; | |
1306 | __le32 *ti_gp_buff_start_addr = NULL; | |
1307 | __le32 *ti_pbuff_start_addr = NULL; | |
1308 | __le32 *ti_cbuff_start_addr = NULL; | |
ed34f34d US |
1309 | struct ext_filesystem *fs = get_fs(); |
1310 | if (*total_remaining_blocks != 0) { | |
1311 | /* triple indirect grand parent block connecting to inode */ | |
1312 | ti_gp_blockno = ext4fs_get_new_blk_no(); | |
1313 | if (ti_gp_blockno == -1) { | |
1314 | printf("no block left to assign\n"); | |
495c3a1e | 1315 | return; |
ed34f34d US |
1316 | } |
1317 | ti_gp_buff = zalloc(fs->blksz); | |
1318 | if (!ti_gp_buff) | |
495c3a1e | 1319 | return; |
ed34f34d US |
1320 | |
1321 | ti_gp_buff_start_addr = ti_gp_buff; | |
1322 | (*no_blks_reqd)++; | |
1323 | debug("TIGPB %ld: %u\n", ti_gp_blockno, | |
1324 | *total_remaining_blocks); | |
1325 | ||
1326 | /* for each 4 byte grand parent entry create one more block */ | |
1327 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { | |
1328 | ti_parent_blockno = ext4fs_get_new_blk_no(); | |
1329 | if (ti_parent_blockno == -1) { | |
1330 | printf("no block left to assign\n"); | |
1331 | goto fail; | |
1332 | } | |
1333 | ti_parent_buff = zalloc(fs->blksz); | |
1334 | if (!ti_parent_buff) | |
1335 | goto fail; | |
1336 | ||
1337 | ti_pbuff_start_addr = ti_parent_buff; | |
58a9ecba | 1338 | *ti_gp_buff = cpu_to_le32(ti_parent_blockno); |
ed34f34d US |
1339 | ti_gp_buff++; |
1340 | (*no_blks_reqd)++; | |
1341 | debug("TIPB %ld: %u\n", ti_parent_blockno, | |
1342 | *total_remaining_blocks); | |
1343 | ||
1344 | /* for each 4 byte entry parent create one more block */ | |
1345 | for (j = 0; j < (fs->blksz / sizeof(int)); j++) { | |
1346 | ti_child_blockno = ext4fs_get_new_blk_no(); | |
1347 | if (ti_child_blockno == -1) { | |
1348 | printf("no block left assign\n"); | |
495c3a1e | 1349 | goto fail1; |
ed34f34d US |
1350 | } |
1351 | ti_child_buff = zalloc(fs->blksz); | |
1352 | if (!ti_child_buff) | |
495c3a1e | 1353 | goto fail1; |
ed34f34d US |
1354 | |
1355 | ti_cbuff_start_addr = ti_child_buff; | |
58a9ecba | 1356 | *ti_parent_buff = cpu_to_le32(ti_child_blockno); |
ed34f34d US |
1357 | ti_parent_buff++; |
1358 | (*no_blks_reqd)++; | |
1359 | debug("TICB %ld: %u\n", ti_parent_blockno, | |
1360 | *total_remaining_blocks); | |
1361 | ||
1362 | /* fill actual datablocks for each child */ | |
1363 | for (k = 0; k < (fs->blksz / sizeof(int)); | |
1364 | k++) { | |
1365 | actual_block_no = | |
1366 | ext4fs_get_new_blk_no(); | |
1367 | if (actual_block_no == -1) { | |
1368 | printf("no block left\n"); | |
495c3a1e TR |
1369 | free(ti_cbuff_start_addr); |
1370 | goto fail1; | |
ed34f34d | 1371 | } |
58a9ecba | 1372 | *ti_child_buff = cpu_to_le32(actual_block_no); |
ed34f34d US |
1373 | debug("TIAB %ld: %u\n", actual_block_no, |
1374 | *total_remaining_blocks); | |
1375 | ||
1376 | ti_child_buff++; | |
1377 | (*total_remaining_blocks)--; | |
1378 | if (*total_remaining_blocks == 0) | |
1379 | break; | |
1380 | } | |
1381 | /* write the child block */ | |
0550870b MH |
1382 | put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * |
1383 | (uint64_t)fs->blksz)), | |
ed34f34d US |
1384 | ti_cbuff_start_addr, fs->blksz); |
1385 | free(ti_cbuff_start_addr); | |
1386 | ||
1387 | if (*total_remaining_blocks == 0) | |
1388 | break; | |
1389 | } | |
1390 | /* write the parent block */ | |
0550870b | 1391 | put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), |
ed34f34d US |
1392 | ti_pbuff_start_addr, fs->blksz); |
1393 | free(ti_pbuff_start_addr); | |
1394 | ||
1395 | if (*total_remaining_blocks == 0) | |
1396 | break; | |
1397 | } | |
1398 | /* write the grand parent block */ | |
0550870b | 1399 | put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), |
ed34f34d | 1400 | ti_gp_buff_start_addr, fs->blksz); |
58a9ecba | 1401 | file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); |
495c3a1e TR |
1402 | free(ti_gp_buff_start_addr); |
1403 | return; | |
ed34f34d | 1404 | } |
495c3a1e TR |
1405 | fail1: |
1406 | free(ti_pbuff_start_addr); | |
ed34f34d US |
1407 | fail: |
1408 | free(ti_gp_buff_start_addr); | |
1409 | } | |
1410 | ||
1411 | void ext4fs_allocate_blocks(struct ext2_inode *file_inode, | |
1412 | unsigned int total_remaining_blocks, | |
1413 | unsigned int *total_no_of_block) | |
1414 | { | |
1415 | short i; | |
1416 | long int direct_blockno; | |
1417 | unsigned int no_blks_reqd = 0; | |
1418 | ||
1419 | /* allocation of direct blocks */ | |
d0180280 | 1420 | for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { |
ed34f34d US |
1421 | direct_blockno = ext4fs_get_new_blk_no(); |
1422 | if (direct_blockno == -1) { | |
1423 | printf("no block left to assign\n"); | |
1424 | return; | |
1425 | } | |
58a9ecba | 1426 | file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); |
ed34f34d US |
1427 | debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); |
1428 | ||
1429 | total_remaining_blocks--; | |
ed34f34d US |
1430 | } |
1431 | ||
1432 | alloc_single_indirect_block(file_inode, &total_remaining_blocks, | |
1433 | &no_blks_reqd); | |
1434 | alloc_double_indirect_block(file_inode, &total_remaining_blocks, | |
1435 | &no_blks_reqd); | |
1436 | alloc_triple_indirect_block(file_inode, &total_remaining_blocks, | |
1437 | &no_blks_reqd); | |
1438 | *total_no_of_block += no_blks_reqd; | |
1439 | } | |
1440 | ||
1441 | #endif | |
1442 | ||
a1596438 US |
1443 | static struct ext4_extent_header *ext4fs_get_extent_block |
1444 | (struct ext2_data *data, char *buf, | |
1445 | struct ext4_extent_header *ext_block, | |
1446 | uint32_t fileblock, int log2_blksz) | |
1447 | { | |
1448 | struct ext4_extent_idx *index; | |
1449 | unsigned long long block; | |
47017327 | 1450 | int blksz = EXT2_BLOCK_SIZE(data); |
a1596438 US |
1451 | int i; |
1452 | ||
1453 | while (1) { | |
1454 | index = (struct ext4_extent_idx *)(ext_block + 1); | |
1455 | ||
8b415f70 | 1456 | if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) |
58a9ecba | 1457 | return NULL; |
a1596438 US |
1458 | |
1459 | if (ext_block->eh_depth == 0) | |
1460 | return ext_block; | |
1461 | i = -1; | |
1462 | do { | |
1463 | i++; | |
8b415f70 | 1464 | if (i >= le16_to_cpu(ext_block->eh_entries)) |
a1596438 | 1465 | break; |
b5bbac1a | 1466 | } while (fileblock >= le32_to_cpu(index[i].ei_block)); |
a1596438 US |
1467 | |
1468 | if (--i < 0) | |
58a9ecba | 1469 | return NULL; |
a1596438 | 1470 | |
8b415f70 | 1471 | block = le16_to_cpu(index[i].ei_leaf_hi); |
a1596438 US |
1472 | block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); |
1473 | ||
47017327 | 1474 | if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, |
04735e9c | 1475 | buf)) |
a1596438 US |
1476 | ext_block = (struct ext4_extent_header *)buf; |
1477 | else | |
58a9ecba | 1478 | return NULL; |
a1596438 US |
1479 | } |
1480 | } | |
1481 | ||
1482 | static int ext4fs_blockgroup | |
1483 | (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) | |
1484 | { | |
1485 | long int blkno; | |
1486 | unsigned int blkoff, desc_per_blk; | |
50ce4c07 | 1487 | int log2blksz = get_fs()->dev_desc->log2blksz; |
a1596438 US |
1488 | |
1489 | desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group); | |
1490 | ||
7f101be3 | 1491 | blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + |
a1596438 US |
1492 | group / desc_per_blk; |
1493 | blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group); | |
1494 | ||
1495 | debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", | |
1496 | group, blkno, blkoff); | |
1497 | ||
04735e9c FL |
1498 | return ext4fs_devread((lbaint_t)blkno << |
1499 | (LOG2_BLOCK_SIZE(data) - log2blksz), | |
a1596438 US |
1500 | blkoff, sizeof(struct ext2_block_group), |
1501 | (char *)blkgrp); | |
1502 | } | |
1503 | ||
1504 | int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) | |
1505 | { | |
1506 | struct ext2_block_group blkgrp; | |
1507 | struct ext2_sblock *sblock = &data->sblock; | |
1508 | struct ext_filesystem *fs = get_fs(); | |
50ce4c07 | 1509 | int log2blksz = get_fs()->dev_desc->log2blksz; |
a1596438 US |
1510 | int inodes_per_block, status; |
1511 | long int blkno; | |
1512 | unsigned int blkoff; | |
1513 | ||
1514 | /* It is easier to calculate if the first inode is 0. */ | |
1515 | ino--; | |
7f101be3 | 1516 | status = ext4fs_blockgroup(data, ino / le32_to_cpu |
a1596438 US |
1517 | (sblock->inodes_per_group), &blkgrp); |
1518 | if (status == 0) | |
1519 | return 0; | |
1520 | ||
1521 | inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; | |
7f101be3 MW |
1522 | blkno = le32_to_cpu(blkgrp.inode_table_id) + |
1523 | (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; | |
a1596438 US |
1524 | blkoff = (ino % inodes_per_block) * fs->inodesz; |
1525 | /* Read the inode. */ | |
04735e9c FL |
1526 | status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - |
1527 | log2blksz), blkoff, | |
a1596438 US |
1528 | sizeof(struct ext2_inode), (char *)inode); |
1529 | if (status == 0) | |
1530 | return 0; | |
1531 | ||
1532 | return 1; | |
1533 | } | |
1534 | ||
1535 | long int read_allocated_block(struct ext2_inode *inode, int fileblock) | |
1536 | { | |
1537 | long int blknr; | |
1538 | int blksz; | |
1539 | int log2_blksz; | |
1540 | int status; | |
1541 | long int rblock; | |
1542 | long int perblock_parent; | |
1543 | long int perblock_child; | |
1544 | unsigned long long start; | |
1545 | /* get the blocksize of the filesystem */ | |
1546 | blksz = EXT2_BLOCK_SIZE(ext4fs_root); | |
50ce4c07 EE |
1547 | log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) |
1548 | - get_fs()->dev_desc->log2blksz; | |
1549 | ||
a1596438 US |
1550 | if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { |
1551 | char *buf = zalloc(blksz); | |
1552 | if (!buf) | |
1553 | return -ENOMEM; | |
1554 | struct ext4_extent_header *ext_block; | |
1555 | struct ext4_extent *extent; | |
1556 | int i = -1; | |
50ce4c07 EE |
1557 | ext_block = |
1558 | ext4fs_get_extent_block(ext4fs_root, buf, | |
1559 | (struct ext4_extent_header *) | |
1560 | inode->b.blocks.dir_blocks, | |
1561 | fileblock, log2_blksz); | |
a1596438 US |
1562 | if (!ext_block) { |
1563 | printf("invalid extent block\n"); | |
1564 | free(buf); | |
1565 | return -EINVAL; | |
1566 | } | |
1567 | ||
1568 | extent = (struct ext4_extent *)(ext_block + 1); | |
1569 | ||
1570 | do { | |
1571 | i++; | |
8b415f70 | 1572 | if (i >= le16_to_cpu(ext_block->eh_entries)) |
a1596438 US |
1573 | break; |
1574 | } while (fileblock >= le32_to_cpu(extent[i].ee_block)); | |
1575 | if (--i >= 0) { | |
1576 | fileblock -= le32_to_cpu(extent[i].ee_block); | |
8b415f70 | 1577 | if (fileblock >= le16_to_cpu(extent[i].ee_len)) { |
a1596438 US |
1578 | free(buf); |
1579 | return 0; | |
1580 | } | |
1581 | ||
8b415f70 | 1582 | start = le16_to_cpu(extent[i].ee_start_hi); |
a1596438 US |
1583 | start = (start << 32) + |
1584 | le32_to_cpu(extent[i].ee_start_lo); | |
1585 | free(buf); | |
1586 | return fileblock + start; | |
1587 | } | |
1588 | ||
1589 | printf("Extent Error\n"); | |
1590 | free(buf); | |
1591 | return -1; | |
1592 | } | |
1593 | ||
1594 | /* Direct blocks. */ | |
1595 | if (fileblock < INDIRECT_BLOCKS) | |
7f101be3 | 1596 | blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); |
a1596438 US |
1597 | |
1598 | /* Indirect. */ | |
1599 | else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { | |
1600 | if (ext4fs_indir1_block == NULL) { | |
1601 | ext4fs_indir1_block = zalloc(blksz); | |
1602 | if (ext4fs_indir1_block == NULL) { | |
1603 | printf("** SI ext2fs read block (indir 1)" | |
1604 | "malloc failed. **\n"); | |
1605 | return -1; | |
1606 | } | |
1607 | ext4fs_indir1_size = blksz; | |
1608 | ext4fs_indir1_blkno = -1; | |
1609 | } | |
1610 | if (blksz != ext4fs_indir1_size) { | |
1611 | free(ext4fs_indir1_block); | |
1612 | ext4fs_indir1_block = NULL; | |
1613 | ext4fs_indir1_size = 0; | |
1614 | ext4fs_indir1_blkno = -1; | |
1615 | ext4fs_indir1_block = zalloc(blksz); | |
1616 | if (ext4fs_indir1_block == NULL) { | |
1617 | printf("** SI ext2fs read block (indir 1):" | |
1618 | "malloc failed. **\n"); | |
1619 | return -1; | |
1620 | } | |
1621 | ext4fs_indir1_size = blksz; | |
1622 | } | |
7f101be3 | 1623 | if ((le32_to_cpu(inode->b.blocks.indir_block) << |
a1596438 US |
1624 | log2_blksz) != ext4fs_indir1_blkno) { |
1625 | status = | |
7f101be3 | 1626 | ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1627 | (inode->b.blocks. |
1628 | indir_block) << log2_blksz, 0, | |
1629 | blksz, (char *)ext4fs_indir1_block); | |
1630 | if (status == 0) { | |
1631 | printf("** SI ext2fs read block (indir 1)" | |
1632 | "failed. **\n"); | |
1633 | return 0; | |
1634 | } | |
1635 | ext4fs_indir1_blkno = | |
7f101be3 | 1636 | le32_to_cpu(inode->b.blocks. |
a1596438 US |
1637 | indir_block) << log2_blksz; |
1638 | } | |
7f101be3 | 1639 | blknr = le32_to_cpu(ext4fs_indir1_block |
a1596438 US |
1640 | [fileblock - INDIRECT_BLOCKS]); |
1641 | } | |
1642 | /* Double indirect. */ | |
1643 | else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * | |
1644 | (blksz / 4 + 1)))) { | |
1645 | ||
1646 | long int perblock = blksz / 4; | |
1647 | long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); | |
1648 | ||
1649 | if (ext4fs_indir1_block == NULL) { | |
1650 | ext4fs_indir1_block = zalloc(blksz); | |
1651 | if (ext4fs_indir1_block == NULL) { | |
1652 | printf("** DI ext2fs read block (indir 2 1)" | |
1653 | "malloc failed. **\n"); | |
1654 | return -1; | |
1655 | } | |
1656 | ext4fs_indir1_size = blksz; | |
1657 | ext4fs_indir1_blkno = -1; | |
1658 | } | |
1659 | if (blksz != ext4fs_indir1_size) { | |
1660 | free(ext4fs_indir1_block); | |
1661 | ext4fs_indir1_block = NULL; | |
1662 | ext4fs_indir1_size = 0; | |
1663 | ext4fs_indir1_blkno = -1; | |
1664 | ext4fs_indir1_block = zalloc(blksz); | |
1665 | if (ext4fs_indir1_block == NULL) { | |
1666 | printf("** DI ext2fs read block (indir 2 1)" | |
1667 | "malloc failed. **\n"); | |
1668 | return -1; | |
1669 | } | |
1670 | ext4fs_indir1_size = blksz; | |
1671 | } | |
7f101be3 | 1672 | if ((le32_to_cpu(inode->b.blocks.double_indir_block) << |
a1596438 US |
1673 | log2_blksz) != ext4fs_indir1_blkno) { |
1674 | status = | |
7f101be3 | 1675 | ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1676 | (inode->b.blocks. |
1677 | double_indir_block) << log2_blksz, | |
1678 | 0, blksz, | |
1679 | (char *)ext4fs_indir1_block); | |
1680 | if (status == 0) { | |
1681 | printf("** DI ext2fs read block (indir 2 1)" | |
1682 | "failed. **\n"); | |
1683 | return -1; | |
1684 | } | |
1685 | ext4fs_indir1_blkno = | |
7f101be3 | 1686 | le32_to_cpu(inode->b.blocks.double_indir_block) << |
a1596438 US |
1687 | log2_blksz; |
1688 | } | |
1689 | ||
1690 | if (ext4fs_indir2_block == NULL) { | |
1691 | ext4fs_indir2_block = zalloc(blksz); | |
1692 | if (ext4fs_indir2_block == NULL) { | |
1693 | printf("** DI ext2fs read block (indir 2 2)" | |
1694 | "malloc failed. **\n"); | |
1695 | return -1; | |
1696 | } | |
1697 | ext4fs_indir2_size = blksz; | |
1698 | ext4fs_indir2_blkno = -1; | |
1699 | } | |
1700 | if (blksz != ext4fs_indir2_size) { | |
1701 | free(ext4fs_indir2_block); | |
1702 | ext4fs_indir2_block = NULL; | |
1703 | ext4fs_indir2_size = 0; | |
1704 | ext4fs_indir2_blkno = -1; | |
1705 | ext4fs_indir2_block = zalloc(blksz); | |
1706 | if (ext4fs_indir2_block == NULL) { | |
1707 | printf("** DI ext2fs read block (indir 2 2)" | |
1708 | "malloc failed. **\n"); | |
1709 | return -1; | |
1710 | } | |
1711 | ext4fs_indir2_size = blksz; | |
1712 | } | |
7f101be3 | 1713 | if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << |
a1596438 | 1714 | log2_blksz) != ext4fs_indir2_blkno) { |
7f101be3 | 1715 | status = ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1716 | (ext4fs_indir1_block |
1717 | [rblock / | |
1718 | perblock]) << log2_blksz, 0, | |
1719 | blksz, | |
1720 | (char *)ext4fs_indir2_block); | |
1721 | if (status == 0) { | |
1722 | printf("** DI ext2fs read block (indir 2 2)" | |
1723 | "failed. **\n"); | |
1724 | return -1; | |
1725 | } | |
1726 | ext4fs_indir2_blkno = | |
7f101be3 | 1727 | le32_to_cpu(ext4fs_indir1_block[rblock |
a1596438 US |
1728 | / |
1729 | perblock]) << | |
1730 | log2_blksz; | |
1731 | } | |
7f101be3 | 1732 | blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); |
a1596438 US |
1733 | } |
1734 | /* Tripple indirect. */ | |
1735 | else { | |
1736 | rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + | |
1737 | (blksz / 4 * blksz / 4)); | |
1738 | perblock_child = blksz / 4; | |
1739 | perblock_parent = ((blksz / 4) * (blksz / 4)); | |
1740 | ||
1741 | if (ext4fs_indir1_block == NULL) { | |
1742 | ext4fs_indir1_block = zalloc(blksz); | |
1743 | if (ext4fs_indir1_block == NULL) { | |
1744 | printf("** TI ext2fs read block (indir 2 1)" | |
1745 | "malloc failed. **\n"); | |
1746 | return -1; | |
1747 | } | |
1748 | ext4fs_indir1_size = blksz; | |
1749 | ext4fs_indir1_blkno = -1; | |
1750 | } | |
1751 | if (blksz != ext4fs_indir1_size) { | |
1752 | free(ext4fs_indir1_block); | |
1753 | ext4fs_indir1_block = NULL; | |
1754 | ext4fs_indir1_size = 0; | |
1755 | ext4fs_indir1_blkno = -1; | |
1756 | ext4fs_indir1_block = zalloc(blksz); | |
1757 | if (ext4fs_indir1_block == NULL) { | |
1758 | printf("** TI ext2fs read block (indir 2 1)" | |
1759 | "malloc failed. **\n"); | |
1760 | return -1; | |
1761 | } | |
1762 | ext4fs_indir1_size = blksz; | |
1763 | } | |
7f101be3 | 1764 | if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << |
a1596438 US |
1765 | log2_blksz) != ext4fs_indir1_blkno) { |
1766 | status = ext4fs_devread | |
04735e9c | 1767 | ((lbaint_t) |
7f101be3 | 1768 | le32_to_cpu(inode->b.blocks.triple_indir_block) |
a1596438 US |
1769 | << log2_blksz, 0, blksz, |
1770 | (char *)ext4fs_indir1_block); | |
1771 | if (status == 0) { | |
1772 | printf("** TI ext2fs read block (indir 2 1)" | |
1773 | "failed. **\n"); | |
1774 | return -1; | |
1775 | } | |
1776 | ext4fs_indir1_blkno = | |
7f101be3 | 1777 | le32_to_cpu(inode->b.blocks.triple_indir_block) << |
a1596438 US |
1778 | log2_blksz; |
1779 | } | |
1780 | ||
1781 | if (ext4fs_indir2_block == NULL) { | |
1782 | ext4fs_indir2_block = zalloc(blksz); | |
1783 | if (ext4fs_indir2_block == NULL) { | |
1784 | printf("** TI ext2fs read block (indir 2 2)" | |
1785 | "malloc failed. **\n"); | |
1786 | return -1; | |
1787 | } | |
1788 | ext4fs_indir2_size = blksz; | |
1789 | ext4fs_indir2_blkno = -1; | |
1790 | } | |
1791 | if (blksz != ext4fs_indir2_size) { | |
1792 | free(ext4fs_indir2_block); | |
1793 | ext4fs_indir2_block = NULL; | |
1794 | ext4fs_indir2_size = 0; | |
1795 | ext4fs_indir2_blkno = -1; | |
1796 | ext4fs_indir2_block = zalloc(blksz); | |
1797 | if (ext4fs_indir2_block == NULL) { | |
1798 | printf("** TI ext2fs read block (indir 2 2)" | |
1799 | "malloc failed. **\n"); | |
1800 | return -1; | |
1801 | } | |
1802 | ext4fs_indir2_size = blksz; | |
1803 | } | |
7f101be3 | 1804 | if ((le32_to_cpu(ext4fs_indir1_block[rblock / |
a1596438 US |
1805 | perblock_parent]) << |
1806 | log2_blksz) | |
1807 | != ext4fs_indir2_blkno) { | |
7f101be3 | 1808 | status = ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1809 | (ext4fs_indir1_block |
1810 | [rblock / | |
1811 | perblock_parent]) << | |
1812 | log2_blksz, 0, blksz, | |
1813 | (char *)ext4fs_indir2_block); | |
1814 | if (status == 0) { | |
1815 | printf("** TI ext2fs read block (indir 2 2)" | |
1816 | "failed. **\n"); | |
1817 | return -1; | |
1818 | } | |
1819 | ext4fs_indir2_blkno = | |
7f101be3 | 1820 | le32_to_cpu(ext4fs_indir1_block[rblock / |
a1596438 US |
1821 | perblock_parent]) |
1822 | << log2_blksz; | |
1823 | } | |
1824 | ||
1825 | if (ext4fs_indir3_block == NULL) { | |
1826 | ext4fs_indir3_block = zalloc(blksz); | |
1827 | if (ext4fs_indir3_block == NULL) { | |
1828 | printf("** TI ext2fs read block (indir 2 2)" | |
1829 | "malloc failed. **\n"); | |
1830 | return -1; | |
1831 | } | |
1832 | ext4fs_indir3_size = blksz; | |
1833 | ext4fs_indir3_blkno = -1; | |
1834 | } | |
1835 | if (blksz != ext4fs_indir3_size) { | |
1836 | free(ext4fs_indir3_block); | |
1837 | ext4fs_indir3_block = NULL; | |
1838 | ext4fs_indir3_size = 0; | |
1839 | ext4fs_indir3_blkno = -1; | |
1840 | ext4fs_indir3_block = zalloc(blksz); | |
1841 | if (ext4fs_indir3_block == NULL) { | |
1842 | printf("** TI ext2fs read block (indir 2 2)" | |
1843 | "malloc failed. **\n"); | |
1844 | return -1; | |
1845 | } | |
1846 | ext4fs_indir3_size = blksz; | |
1847 | } | |
7f101be3 | 1848 | if ((le32_to_cpu(ext4fs_indir2_block[rblock |
a1596438 US |
1849 | / |
1850 | perblock_child]) << | |
1851 | log2_blksz) != ext4fs_indir3_blkno) { | |
1852 | status = | |
7f101be3 | 1853 | ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1854 | (ext4fs_indir2_block |
1855 | [(rblock / perblock_child) | |
1856 | % (blksz / 4)]) << log2_blksz, 0, | |
1857 | blksz, (char *)ext4fs_indir3_block); | |
1858 | if (status == 0) { | |
1859 | printf("** TI ext2fs read block (indir 2 2)" | |
1860 | "failed. **\n"); | |
1861 | return -1; | |
1862 | } | |
1863 | ext4fs_indir3_blkno = | |
7f101be3 | 1864 | le32_to_cpu(ext4fs_indir2_block[(rblock / |
a1596438 US |
1865 | perblock_child) % |
1866 | (blksz / | |
1867 | 4)]) << | |
1868 | log2_blksz; | |
1869 | } | |
1870 | ||
7f101be3 | 1871 | blknr = le32_to_cpu(ext4fs_indir3_block |
a1596438 US |
1872 | [rblock % perblock_child]); |
1873 | } | |
50ce4c07 | 1874 | debug("read_allocated_block %ld\n", blknr); |
a1596438 US |
1875 | |
1876 | return blknr; | |
1877 | } | |
1878 | ||
8b454eee ŁM |
1879 | /** |
1880 | * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's | |
1881 | * global pointers | |
1882 | * | |
1883 | * This function assures that for a file with the same name but different size | |
1884 | * the sequential store on the ext4 filesystem will be correct. | |
1885 | * | |
1886 | * In this function the global data, responsible for internal representation | |
1887 | * of the ext4 data are initialized to the reset state. Without this, during | |
1888 | * replacement of the smaller file with the bigger truncation of new file was | |
1889 | * performed. | |
1890 | */ | |
1891 | void ext4fs_reinit_global(void) | |
a1596438 | 1892 | { |
a1596438 US |
1893 | if (ext4fs_indir1_block != NULL) { |
1894 | free(ext4fs_indir1_block); | |
1895 | ext4fs_indir1_block = NULL; | |
1896 | ext4fs_indir1_size = 0; | |
1897 | ext4fs_indir1_blkno = -1; | |
1898 | } | |
1899 | if (ext4fs_indir2_block != NULL) { | |
1900 | free(ext4fs_indir2_block); | |
1901 | ext4fs_indir2_block = NULL; | |
1902 | ext4fs_indir2_size = 0; | |
1903 | ext4fs_indir2_blkno = -1; | |
1904 | } | |
1905 | if (ext4fs_indir3_block != NULL) { | |
1906 | free(ext4fs_indir3_block); | |
1907 | ext4fs_indir3_block = NULL; | |
1908 | ext4fs_indir3_size = 0; | |
1909 | ext4fs_indir3_blkno = -1; | |
1910 | } | |
1911 | } | |
8b454eee ŁM |
1912 | void ext4fs_close(void) |
1913 | { | |
1914 | if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { | |
1915 | ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); | |
1916 | ext4fs_file = NULL; | |
1917 | } | |
1918 | if (ext4fs_root != NULL) { | |
1919 | free(ext4fs_root); | |
1920 | ext4fs_root = NULL; | |
1921 | } | |
1922 | ||
1923 | ext4fs_reinit_global(); | |
1924 | } | |
a1596438 US |
1925 | |
1926 | int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, | |
1927 | struct ext2fs_node **fnode, int *ftype) | |
1928 | { | |
1929 | unsigned int fpos = 0; | |
1930 | int status; | |
9f12cd0e | 1931 | loff_t actread; |
a1596438 US |
1932 | struct ext2fs_node *diro = (struct ext2fs_node *) dir; |
1933 | ||
1934 | #ifdef DEBUG | |
1935 | if (name != NULL) | |
1936 | printf("Iterate dir %s\n", name); | |
1937 | #endif /* of DEBUG */ | |
1938 | if (!diro->inode_read) { | |
1939 | status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); | |
1940 | if (status == 0) | |
1941 | return 0; | |
1942 | } | |
1943 | /* Search the file. */ | |
7f101be3 | 1944 | while (fpos < le32_to_cpu(diro->inode.size)) { |
a1596438 US |
1945 | struct ext2_dirent dirent; |
1946 | ||
1947 | status = ext4fs_read_file(diro, fpos, | |
1948 | sizeof(struct ext2_dirent), | |
9f12cd0e SR |
1949 | (char *)&dirent, &actread); |
1950 | if (status < 0) | |
a1596438 US |
1951 | return 0; |
1952 | ||
54d68e93 TF |
1953 | if (dirent.direntlen == 0) { |
1954 | printf("Failed to iterate over directory %s\n", name); | |
1955 | return 0; | |
1956 | } | |
1957 | ||
a1596438 US |
1958 | if (dirent.namelen != 0) { |
1959 | char filename[dirent.namelen + 1]; | |
1960 | struct ext2fs_node *fdiro; | |
1961 | int type = FILETYPE_UNKNOWN; | |
1962 | ||
1963 | status = ext4fs_read_file(diro, | |
1964 | fpos + | |
1965 | sizeof(struct ext2_dirent), | |
9f12cd0e SR |
1966 | dirent.namelen, filename, |
1967 | &actread); | |
1968 | if (status < 0) | |
a1596438 US |
1969 | return 0; |
1970 | ||
1971 | fdiro = zalloc(sizeof(struct ext2fs_node)); | |
1972 | if (!fdiro) | |
1973 | return 0; | |
1974 | ||
1975 | fdiro->data = diro->data; | |
7f101be3 | 1976 | fdiro->ino = le32_to_cpu(dirent.inode); |
a1596438 US |
1977 | |
1978 | filename[dirent.namelen] = '\0'; | |
1979 | ||
1980 | if (dirent.filetype != FILETYPE_UNKNOWN) { | |
1981 | fdiro->inode_read = 0; | |
1982 | ||
1983 | if (dirent.filetype == FILETYPE_DIRECTORY) | |
1984 | type = FILETYPE_DIRECTORY; | |
1985 | else if (dirent.filetype == FILETYPE_SYMLINK) | |
1986 | type = FILETYPE_SYMLINK; | |
1987 | else if (dirent.filetype == FILETYPE_REG) | |
1988 | type = FILETYPE_REG; | |
1989 | } else { | |
1990 | status = ext4fs_read_inode(diro->data, | |
7f101be3 | 1991 | le32_to_cpu |
a1596438 US |
1992 | (dirent.inode), |
1993 | &fdiro->inode); | |
1994 | if (status == 0) { | |
1995 | free(fdiro); | |
1996 | return 0; | |
1997 | } | |
1998 | fdiro->inode_read = 1; | |
1999 | ||
7f101be3 | 2000 | if ((le16_to_cpu(fdiro->inode.mode) & |
a1596438 US |
2001 | FILETYPE_INO_MASK) == |
2002 | FILETYPE_INO_DIRECTORY) { | |
2003 | type = FILETYPE_DIRECTORY; | |
7f101be3 | 2004 | } else if ((le16_to_cpu(fdiro->inode.mode) |
a1596438 US |
2005 | & FILETYPE_INO_MASK) == |
2006 | FILETYPE_INO_SYMLINK) { | |
2007 | type = FILETYPE_SYMLINK; | |
7f101be3 | 2008 | } else if ((le16_to_cpu(fdiro->inode.mode) |
a1596438 US |
2009 | & FILETYPE_INO_MASK) == |
2010 | FILETYPE_INO_REG) { | |
2011 | type = FILETYPE_REG; | |
2012 | } | |
2013 | } | |
2014 | #ifdef DEBUG | |
2015 | printf("iterate >%s<\n", filename); | |
2016 | #endif /* of DEBUG */ | |
2017 | if ((name != NULL) && (fnode != NULL) | |
2018 | && (ftype != NULL)) { | |
2019 | if (strcmp(filename, name) == 0) { | |
2020 | *ftype = type; | |
2021 | *fnode = fdiro; | |
2022 | return 1; | |
2023 | } | |
2024 | } else { | |
2025 | if (fdiro->inode_read == 0) { | |
2026 | status = ext4fs_read_inode(diro->data, | |
7f101be3 | 2027 | le32_to_cpu( |
a1596438 US |
2028 | dirent.inode), |
2029 | &fdiro->inode); | |
2030 | if (status == 0) { | |
2031 | free(fdiro); | |
2032 | return 0; | |
2033 | } | |
2034 | fdiro->inode_read = 1; | |
2035 | } | |
2036 | switch (type) { | |
2037 | case FILETYPE_DIRECTORY: | |
2038 | printf("<DIR> "); | |
2039 | break; | |
2040 | case FILETYPE_SYMLINK: | |
2041 | printf("<SYM> "); | |
2042 | break; | |
2043 | case FILETYPE_REG: | |
2044 | printf(" "); | |
2045 | break; | |
2046 | default: | |
2047 | printf("< ? > "); | |
2048 | break; | |
2049 | } | |
9f12cd0e | 2050 | printf("%10u %s\n", |
7f101be3 | 2051 | le32_to_cpu(fdiro->inode.size), |
a1596438 US |
2052 | filename); |
2053 | } | |
2054 | free(fdiro); | |
2055 | } | |
7f101be3 | 2056 | fpos += le16_to_cpu(dirent.direntlen); |
a1596438 US |
2057 | } |
2058 | return 0; | |
2059 | } | |
2060 | ||
2061 | static char *ext4fs_read_symlink(struct ext2fs_node *node) | |
2062 | { | |
2063 | char *symlink; | |
2064 | struct ext2fs_node *diro = node; | |
2065 | int status; | |
9f12cd0e | 2066 | loff_t actread; |
a1596438 US |
2067 | |
2068 | if (!diro->inode_read) { | |
2069 | status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); | |
2070 | if (status == 0) | |
58a9ecba | 2071 | return NULL; |
a1596438 | 2072 | } |
7f101be3 | 2073 | symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); |
a1596438 | 2074 | if (!symlink) |
58a9ecba | 2075 | return NULL; |
a1596438 | 2076 | |
7f101be3 | 2077 | if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { |
a1596438 | 2078 | strncpy(symlink, diro->inode.b.symlink, |
7f101be3 | 2079 | le32_to_cpu(diro->inode.size)); |
a1596438 US |
2080 | } else { |
2081 | status = ext4fs_read_file(diro, 0, | |
7f101be3 | 2082 | le32_to_cpu(diro->inode.size), |
9f12cd0e | 2083 | symlink, &actread); |
9d2f6a9a | 2084 | if ((status < 0) || (actread == 0)) { |
a1596438 | 2085 | free(symlink); |
58a9ecba | 2086 | return NULL; |
a1596438 US |
2087 | } |
2088 | } | |
7f101be3 | 2089 | symlink[le32_to_cpu(diro->inode.size)] = '\0'; |
a1596438 US |
2090 | return symlink; |
2091 | } | |
2092 | ||
2093 | static int ext4fs_find_file1(const char *currpath, | |
2094 | struct ext2fs_node *currroot, | |
2095 | struct ext2fs_node **currfound, int *foundtype) | |
2096 | { | |
2097 | char fpath[strlen(currpath) + 1]; | |
2098 | char *name = fpath; | |
2099 | char *next; | |
2100 | int status; | |
2101 | int type = FILETYPE_DIRECTORY; | |
2102 | struct ext2fs_node *currnode = currroot; | |
2103 | struct ext2fs_node *oldnode = currroot; | |
2104 | ||
2105 | strncpy(fpath, currpath, strlen(currpath) + 1); | |
2106 | ||
2107 | /* Remove all leading slashes. */ | |
2108 | while (*name == '/') | |
2109 | name++; | |
2110 | ||
2111 | if (!*name) { | |
2112 | *currfound = currnode; | |
2113 | return 1; | |
2114 | } | |
2115 | ||
2116 | for (;;) { | |
2117 | int found; | |
2118 | ||
2119 | /* Extract the actual part from the pathname. */ | |
2120 | next = strchr(name, '/'); | |
2121 | if (next) { | |
2122 | /* Remove all leading slashes. */ | |
2123 | while (*next == '/') | |
2124 | *(next++) = '\0'; | |
2125 | } | |
2126 | ||
2127 | if (type != FILETYPE_DIRECTORY) { | |
2128 | ext4fs_free_node(currnode, currroot); | |
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | oldnode = currnode; | |
2133 | ||
2134 | /* Iterate over the directory. */ | |
2135 | found = ext4fs_iterate_dir(currnode, name, &currnode, &type); | |
2136 | if (found == 0) | |
2137 | return 0; | |
2138 | ||
2139 | if (found == -1) | |
2140 | break; | |
2141 | ||
2142 | /* Read in the symlink and follow it. */ | |
2143 | if (type == FILETYPE_SYMLINK) { | |
2144 | char *symlink; | |
2145 | ||
2146 | /* Test if the symlink does not loop. */ | |
2147 | if (++symlinknest == 8) { | |
2148 | ext4fs_free_node(currnode, currroot); | |
2149 | ext4fs_free_node(oldnode, currroot); | |
2150 | return 0; | |
2151 | } | |
2152 | ||
2153 | symlink = ext4fs_read_symlink(currnode); | |
2154 | ext4fs_free_node(currnode, currroot); | |
2155 | ||
2156 | if (!symlink) { | |
2157 | ext4fs_free_node(oldnode, currroot); | |
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | debug("Got symlink >%s<\n", symlink); | |
2162 | ||
2163 | if (symlink[0] == '/') { | |
2164 | ext4fs_free_node(oldnode, currroot); | |
2165 | oldnode = &ext4fs_root->diropen; | |
2166 | } | |
2167 | ||
2168 | /* Lookup the node the symlink points to. */ | |
2169 | status = ext4fs_find_file1(symlink, oldnode, | |
2170 | &currnode, &type); | |
2171 | ||
2172 | free(symlink); | |
2173 | ||
2174 | if (status == 0) { | |
2175 | ext4fs_free_node(oldnode, currroot); | |
2176 | return 0; | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | ext4fs_free_node(oldnode, currroot); | |
2181 | ||
2182 | /* Found the node! */ | |
2183 | if (!next || *next == '\0') { | |
2184 | *currfound = currnode; | |
2185 | *foundtype = type; | |
2186 | return 1; | |
2187 | } | |
2188 | name = next; | |
2189 | } | |
2190 | return -1; | |
2191 | } | |
2192 | ||
2193 | int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, | |
2194 | struct ext2fs_node **foundnode, int expecttype) | |
2195 | { | |
2196 | int status; | |
2197 | int foundtype = FILETYPE_DIRECTORY; | |
2198 | ||
2199 | symlinknest = 0; | |
2200 | if (!path) | |
2201 | return 0; | |
2202 | ||
2203 | status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); | |
2204 | if (status == 0) | |
2205 | return 0; | |
2206 | ||
2207 | /* Check if the node that was found was of the expected type. */ | |
2208 | if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) | |
2209 | return 0; | |
2210 | else if ((expecttype == FILETYPE_DIRECTORY) | |
2211 | && (foundtype != expecttype)) | |
2212 | return 0; | |
2213 | ||
2214 | return 1; | |
2215 | } | |
2216 | ||
9f12cd0e | 2217 | int ext4fs_open(const char *filename, loff_t *len) |
a1596438 US |
2218 | { |
2219 | struct ext2fs_node *fdiro = NULL; | |
2220 | int status; | |
a1596438 US |
2221 | |
2222 | if (ext4fs_root == NULL) | |
2223 | return -1; | |
2224 | ||
2225 | ext4fs_file = NULL; | |
2226 | status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, | |
2227 | FILETYPE_REG); | |
2228 | if (status == 0) | |
2229 | goto fail; | |
2230 | ||
2231 | if (!fdiro->inode_read) { | |
2232 | status = ext4fs_read_inode(fdiro->data, fdiro->ino, | |
2233 | &fdiro->inode); | |
2234 | if (status == 0) | |
2235 | goto fail; | |
2236 | } | |
7f101be3 | 2237 | *len = le32_to_cpu(fdiro->inode.size); |
a1596438 US |
2238 | ext4fs_file = fdiro; |
2239 | ||
9f12cd0e | 2240 | return 0; |
a1596438 US |
2241 | fail: |
2242 | ext4fs_free_node(fdiro, &ext4fs_root->diropen); | |
2243 | ||
2244 | return -1; | |
2245 | } | |
2246 | ||
2247 | int ext4fs_mount(unsigned part_length) | |
2248 | { | |
2249 | struct ext2_data *data; | |
2250 | int status; | |
2251 | struct ext_filesystem *fs = get_fs(); | |
50ce4c07 | 2252 | data = zalloc(SUPERBLOCK_SIZE); |
a1596438 US |
2253 | if (!data) |
2254 | return 0; | |
2255 | ||
2256 | /* Read the superblock. */ | |
50ce4c07 | 2257 | status = ext4_read_superblock((char *)&data->sblock); |
a1596438 US |
2258 | |
2259 | if (status == 0) | |
2260 | goto fail; | |
2261 | ||
2262 | /* Make sure this is an ext2 filesystem. */ | |
7f101be3 | 2263 | if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) |
a1596438 US |
2264 | goto fail; |
2265 | ||
6f94ab66 TR |
2266 | /* |
2267 | * The 64bit feature was enabled when metadata_csum was enabled | |
2268 | * and we do not support metadata_csum (and cannot reliably find | |
2269 | * files when it is set. Refuse to mount. | |
2270 | */ | |
58a9ecba | 2271 | if (le32_to_cpu(data->sblock.feature_incompat) & EXT4_FEATURE_INCOMPAT_64BIT) { |
6f94ab66 TR |
2272 | printf("Unsupported feature found (64bit, possibly metadata_csum), not mounting\n"); |
2273 | goto fail; | |
2274 | } | |
2275 | ||
7f101be3 | 2276 | if (le32_to_cpu(data->sblock.revision_level == 0)) |
a1596438 US |
2277 | fs->inodesz = 128; |
2278 | else | |
7f101be3 | 2279 | fs->inodesz = le16_to_cpu(data->sblock.inode_size); |
a1596438 US |
2280 | |
2281 | debug("EXT2 rev %d, inode_size %d\n", | |
7f101be3 | 2282 | le32_to_cpu(data->sblock.revision_level), fs->inodesz); |
a1596438 US |
2283 | |
2284 | data->diropen.data = data; | |
2285 | data->diropen.ino = 2; | |
2286 | data->diropen.inode_read = 1; | |
2287 | data->inode = &data->diropen.inode; | |
2288 | ||
2289 | status = ext4fs_read_inode(data, 2, data->inode); | |
2290 | if (status == 0) | |
2291 | goto fail; | |
2292 | ||
2293 | ext4fs_root = data; | |
2294 | ||
2295 | return 1; | |
2296 | fail: | |
2297 | printf("Failed to mount ext2 filesystem...\n"); | |
2298 | free(data); | |
2299 | ext4fs_root = NULL; | |
2300 | ||
2301 | return 0; | |
2302 | } |