Commit | Line | Data |
---|---|---|
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 | ||
a0d767e2 | 369 | int ext4fs_update_parent_dentry(char *filename, int file_type) |
ed34f34d US |
370 | { |
371 | unsigned int *zero_buffer = NULL; | |
372 | char *root_first_block_buffer = NULL; | |
a321abd5 | 373 | int blk_idx; |
ed34f34d | 374 | long int first_block_no_of_root = 0; |
ed34f34d | 375 | int totalbytes = 0; |
ed34f34d | 376 | unsigned int new_entry_byte_reqd; |
ed34f34d US |
377 | int sizeof_void_space = 0; |
378 | int templength = 0; | |
a0d767e2 | 379 | int inodeno = -1; |
ed34f34d US |
380 | int status; |
381 | struct ext_filesystem *fs = get_fs(); | |
382 | /* directory entry */ | |
383 | struct ext2_dirent *dir; | |
ed34f34d | 384 | char *temp_dir = NULL; |
58a9ecba MW |
385 | uint32_t new_blk_no; |
386 | uint32_t new_size; | |
387 | uint32_t new_blockcnt; | |
a321abd5 | 388 | uint32_t directory_blocks; |
ed34f34d US |
389 | |
390 | zero_buffer = zalloc(fs->blksz); | |
391 | if (!zero_buffer) { | |
392 | printf("No Memory\n"); | |
a0d767e2 | 393 | return -1; |
ed34f34d US |
394 | } |
395 | root_first_block_buffer = zalloc(fs->blksz); | |
396 | if (!root_first_block_buffer) { | |
397 | free(zero_buffer); | |
398 | printf("No Memory\n"); | |
a0d767e2 | 399 | return -1; |
ed34f34d | 400 | } |
a321abd5 SB |
401 | new_entry_byte_reqd = ROUND(strlen(filename) + |
402 | sizeof(struct ext2_dirent), 4); | |
ed34f34d | 403 | restart: |
a321abd5 SB |
404 | directory_blocks = le32_to_cpu(g_parent_inode->size) >> |
405 | LOG2_BLOCK_SIZE(ext4fs_root); | |
406 | blk_idx = directory_blocks - 1; | |
ed34f34d | 407 | |
a321abd5 | 408 | restart_read: |
ed34f34d | 409 | /* read the block no allocated to a file */ |
a321abd5 SB |
410 | first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx); |
411 | if (first_block_no_of_root <= 0) | |
412 | goto fail; | |
ed34f34d | 413 | |
04735e9c | 414 | status = ext4fs_devread((lbaint_t)first_block_no_of_root |
ed34f34d US |
415 | * fs->sect_perblk, |
416 | 0, fs->blksz, root_first_block_buffer); | |
417 | if (status == 0) | |
418 | goto fail; | |
419 | ||
420 | if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) | |
421 | goto fail; | |
422 | dir = (struct ext2_dirent *)root_first_block_buffer; | |
ed34f34d | 423 | totalbytes = 0; |
a321abd5 | 424 | |
58a9ecba | 425 | while (le16_to_cpu(dir->direntlen) > 0) { |
a321abd5 SB |
426 | unsigned short used_len = ROUND(dir->namelen + |
427 | sizeof(struct ext2_dirent), 4); | |
428 | ||
429 | /* last entry of block */ | |
58a9ecba | 430 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) { |
a321abd5 SB |
431 | |
432 | /* check if new entry fits */ | |
433 | if ((used_len + new_entry_byte_reqd) <= | |
434 | le16_to_cpu(dir->direntlen)) { | |
435 | dir->direntlen = cpu_to_le16(used_len); | |
436 | break; | |
437 | } else { | |
438 | if (blk_idx > 0) { | |
439 | printf("Block full, trying previous\n"); | |
440 | blk_idx--; | |
441 | goto restart_read; | |
442 | } | |
443 | printf("All blocks full: Allocate new\n"); | |
ed34f34d | 444 | |
b96c3c72 SB |
445 | if (le32_to_cpu(g_parent_inode->flags) & |
446 | EXT4_EXTENTS_FL) { | |
447 | printf("Directory uses extents\n"); | |
448 | goto fail; | |
449 | } | |
a321abd5 | 450 | if (directory_blocks >= INDIRECT_BLOCKS) { |
ed34f34d US |
451 | printf("Directory exceeds limit\n"); |
452 | goto fail; | |
453 | } | |
58a9ecba MW |
454 | new_blk_no = ext4fs_get_new_blk_no(); |
455 | if (new_blk_no == -1) { | |
ed34f34d US |
456 | printf("no block left to assign\n"); |
457 | goto fail; | |
458 | } | |
58a9ecba | 459 | put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz); |
a321abd5 SB |
460 | g_parent_inode->b.blocks. |
461 | dir_blocks[directory_blocks] = | |
58a9ecba MW |
462 | cpu_to_le32(new_blk_no); |
463 | ||
464 | new_size = le32_to_cpu(g_parent_inode->size); | |
465 | new_size += fs->blksz; | |
466 | g_parent_inode->size = cpu_to_le32(new_size); | |
467 | ||
468 | new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt); | |
469 | new_blockcnt += fs->sect_perblk; | |
470 | g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt); | |
471 | ||
ed34f34d US |
472 | if (ext4fs_put_metadata |
473 | (root_first_block_buffer, | |
474 | first_block_no_of_root)) | |
475 | goto fail; | |
476 | goto restart; | |
477 | } | |
ed34f34d US |
478 | } |
479 | ||
58a9ecba | 480 | templength = le16_to_cpu(dir->direntlen); |
ed34f34d US |
481 | totalbytes = totalbytes + templength; |
482 | sizeof_void_space = check_void_in_dentry(dir, filename); | |
483 | if (sizeof_void_space) | |
484 | break; | |
485 | ||
486 | dir = (struct ext2_dirent *)((char *)dir + templength); | |
ed34f34d US |
487 | } |
488 | ||
489 | /* make a pointer ready for creating next directory entry */ | |
58a9ecba | 490 | templength = le16_to_cpu(dir->direntlen); |
ed34f34d US |
491 | totalbytes = totalbytes + templength; |
492 | dir = (struct ext2_dirent *)((char *)dir + templength); | |
ed34f34d US |
493 | |
494 | /* get the next available inode number */ | |
495 | inodeno = ext4fs_get_new_inode_no(); | |
496 | if (inodeno == -1) { | |
497 | printf("no inode left to assign\n"); | |
498 | goto fail; | |
499 | } | |
58a9ecba | 500 | dir->inode = cpu_to_le32(inodeno); |
ed34f34d | 501 | if (sizeof_void_space) |
58a9ecba | 502 | dir->direntlen = cpu_to_le16(sizeof_void_space); |
ed34f34d | 503 | else |
58a9ecba | 504 | dir->direntlen = cpu_to_le16(fs->blksz - totalbytes); |
ed34f34d US |
505 | |
506 | dir->namelen = strlen(filename); | |
507 | dir->filetype = FILETYPE_REG; /* regular file */ | |
508 | temp_dir = (char *)dir; | |
509 | temp_dir = temp_dir + sizeof(struct ext2_dirent); | |
510 | memcpy(temp_dir, filename, strlen(filename)); | |
511 | ||
ed34f34d US |
512 | /* update or write the 1st block of root inode */ |
513 | if (ext4fs_put_metadata(root_first_block_buffer, | |
514 | first_block_no_of_root)) | |
515 | goto fail; | |
516 | ||
517 | fail: | |
518 | free(zero_buffer); | |
519 | free(root_first_block_buffer); | |
a0d767e2 SB |
520 | |
521 | return inodeno; | |
ed34f34d US |
522 | } |
523 | ||
524 | static int search_dir(struct ext2_inode *parent_inode, char *dirname) | |
525 | { | |
526 | int status; | |
76a29519 | 527 | int inodeno = 0; |
ed34f34d US |
528 | int totalbytes; |
529 | int templength; | |
530 | int direct_blk_idx; | |
531 | long int blknr; | |
ed34f34d US |
532 | char *ptr = NULL; |
533 | unsigned char *block_buffer = NULL; | |
534 | struct ext2_dirent *dir = NULL; | |
ed34f34d US |
535 | struct ext_filesystem *fs = get_fs(); |
536 | ||
537 | /* read the block no allocated to a file */ | |
538 | for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; | |
539 | direct_blk_idx++) { | |
540 | blknr = read_allocated_block(parent_inode, direct_blk_idx); | |
541 | if (blknr == 0) | |
542 | goto fail; | |
543 | ||
76a29519 | 544 | /* read the blocks of parent inode */ |
ed34f34d US |
545 | block_buffer = zalloc(fs->blksz); |
546 | if (!block_buffer) | |
547 | goto fail; | |
548 | ||
04735e9c | 549 | status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, |
ed34f34d US |
550 | 0, fs->blksz, (char *)block_buffer); |
551 | if (status == 0) | |
552 | goto fail; | |
553 | ||
554 | dir = (struct ext2_dirent *)block_buffer; | |
555 | ptr = (char *)dir; | |
556 | totalbytes = 0; | |
58a9ecba | 557 | while (le16_to_cpu(dir->direntlen) >= 0) { |
ed34f34d US |
558 | /* |
559 | * blocksize-totalbytes because last directory | |
560 | * length i.e.,*dir->direntlen is free availble | |
561 | * space in the block that means | |
562 | * it is a last entry of directory entry | |
563 | */ | |
76a29519 | 564 | if (dir->inode && (strlen(dirname) == dir->namelen)) { |
58a9ecba | 565 | if (strncmp(dirname, ptr + sizeof(struct ext2_dirent), dir->namelen) == 0) { |
58a9ecba | 566 | inodeno = le32_to_cpu(dir->inode); |
ed34f34d US |
567 | break; |
568 | } | |
569 | } | |
570 | ||
58a9ecba | 571 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) |
ed34f34d US |
572 | break; |
573 | ||
574 | /* traversing the each directory entry */ | |
58a9ecba | 575 | templength = le16_to_cpu(dir->direntlen); |
ed34f34d | 576 | totalbytes = totalbytes + templength; |
ed34f34d US |
577 | dir = (struct ext2_dirent *)((char *)dir + templength); |
578 | ptr = (char *)dir; | |
579 | } | |
580 | ||
ed34f34d US |
581 | free(block_buffer); |
582 | block_buffer = NULL; | |
76a29519 SB |
583 | |
584 | if (inodeno > 0) | |
585 | return inodeno; | |
ed34f34d US |
586 | } |
587 | ||
588 | fail: | |
589 | free(block_buffer); | |
590 | ||
591 | return -1; | |
592 | } | |
593 | ||
594 | static int find_dir_depth(char *dirname) | |
595 | { | |
596 | char *token = strtok(dirname, "/"); | |
597 | int count = 0; | |
598 | while (token != NULL) { | |
599 | token = strtok(NULL, "/"); | |
600 | count++; | |
601 | } | |
602 | return count + 1 + 1; | |
603 | /* | |
604 | * for example for string /home/temp | |
605 | * depth=home(1)+temp(1)+1 extra for NULL; | |
606 | * so count is 4; | |
607 | */ | |
608 | } | |
609 | ||
610 | static int parse_path(char **arr, char *dirname) | |
611 | { | |
612 | char *token = strtok(dirname, "/"); | |
613 | int i = 0; | |
614 | ||
615 | /* add root */ | |
616 | arr[i] = zalloc(strlen("/") + 1); | |
617 | if (!arr[i]) | |
618 | return -ENOMEM; | |
934b14f2 | 619 | memcpy(arr[i++], "/", strlen("/")); |
ed34f34d US |
620 | |
621 | /* add each path entry after root */ | |
622 | while (token != NULL) { | |
623 | arr[i] = zalloc(strlen(token) + 1); | |
624 | if (!arr[i]) | |
625 | return -ENOMEM; | |
626 | memcpy(arr[i++], token, strlen(token)); | |
627 | token = strtok(NULL, "/"); | |
628 | } | |
629 | arr[i] = NULL; | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
634 | int ext4fs_iget(int inode_no, struct ext2_inode *inode) | |
635 | { | |
636 | if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) | |
637 | return -1; | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | /* | |
643 | * Function: ext4fs_get_parent_inode_num | |
644 | * Return Value: inode Number of the parent directory of file/Directory to be | |
645 | * created | |
646 | * dirname : Input parmater, input path name of the file/directory to be created | |
647 | * dname : Output parameter, to be filled with the name of the directory | |
648 | * extracted from dirname | |
649 | */ | |
650 | int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) | |
651 | { | |
652 | int i; | |
653 | int depth = 0; | |
654 | int matched_inode_no; | |
655 | int result_inode_no = -1; | |
656 | char **ptr = NULL; | |
657 | char *depth_dirname = NULL; | |
658 | char *parse_dirname = NULL; | |
659 | struct ext2_inode *parent_inode = NULL; | |
660 | struct ext2_inode *first_inode = NULL; | |
661 | struct ext2_inode temp_inode; | |
662 | ||
663 | if (*dirname != '/') { | |
664 | printf("Please supply Absolute path\n"); | |
665 | return -1; | |
666 | } | |
667 | ||
668 | /* TODO: input validation make equivalent to linux */ | |
669 | depth_dirname = zalloc(strlen(dirname) + 1); | |
670 | if (!depth_dirname) | |
671 | return -ENOMEM; | |
672 | ||
673 | memcpy(depth_dirname, dirname, strlen(dirname)); | |
674 | depth = find_dir_depth(depth_dirname); | |
675 | parse_dirname = zalloc(strlen(dirname) + 1); | |
676 | if (!parse_dirname) | |
677 | goto fail; | |
678 | memcpy(parse_dirname, dirname, strlen(dirname)); | |
679 | ||
680 | /* allocate memory for each directory level */ | |
681 | ptr = zalloc((depth) * sizeof(char *)); | |
682 | if (!ptr) | |
683 | goto fail; | |
684 | if (parse_path(ptr, parse_dirname)) | |
685 | goto fail; | |
686 | parent_inode = zalloc(sizeof(struct ext2_inode)); | |
687 | if (!parent_inode) | |
688 | goto fail; | |
689 | first_inode = zalloc(sizeof(struct ext2_inode)); | |
690 | if (!first_inode) | |
691 | goto fail; | |
692 | memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); | |
693 | memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); | |
694 | if (flags & F_FILE) | |
695 | result_inode_no = EXT2_ROOT_INO; | |
696 | for (i = 1; i < depth; i++) { | |
697 | matched_inode_no = search_dir(parent_inode, ptr[i]); | |
698 | if (matched_inode_no == -1) { | |
699 | if (ptr[i + 1] == NULL && i == 1) { | |
700 | result_inode_no = EXT2_ROOT_INO; | |
701 | goto end; | |
702 | } else { | |
703 | if (ptr[i + 1] == NULL) | |
704 | break; | |
705 | printf("Invalid path\n"); | |
706 | result_inode_no = -1; | |
707 | goto fail; | |
708 | } | |
709 | } else { | |
710 | if (ptr[i + 1] != NULL) { | |
711 | memset(parent_inode, '\0', | |
712 | sizeof(struct ext2_inode)); | |
713 | if (ext4fs_iget(matched_inode_no, | |
714 | parent_inode)) { | |
715 | result_inode_no = -1; | |
716 | goto fail; | |
717 | } | |
718 | result_inode_no = matched_inode_no; | |
719 | } else { | |
720 | break; | |
721 | } | |
722 | } | |
723 | } | |
724 | ||
725 | end: | |
726 | if (i == 1) | |
727 | matched_inode_no = search_dir(first_inode, ptr[i]); | |
728 | else | |
729 | matched_inode_no = search_dir(parent_inode, ptr[i]); | |
730 | ||
731 | if (matched_inode_no != -1) { | |
732 | ext4fs_iget(matched_inode_no, &temp_inode); | |
58a9ecba | 733 | if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { |
ed34f34d US |
734 | printf("It is a Directory\n"); |
735 | result_inode_no = -1; | |
736 | goto fail; | |
737 | } | |
738 | } | |
739 | ||
740 | if (strlen(ptr[i]) > 256) { | |
741 | result_inode_no = -1; | |
742 | goto fail; | |
743 | } | |
744 | memcpy(dname, ptr[i], strlen(ptr[i])); | |
745 | ||
746 | fail: | |
747 | free(depth_dirname); | |
748 | free(parse_dirname); | |
934b14f2 SW |
749 | for (i = 0; i < depth; i++) { |
750 | if (!ptr[i]) | |
751 | break; | |
752 | free(ptr[i]); | |
753 | } | |
ed34f34d US |
754 | free(ptr); |
755 | free(parent_inode); | |
756 | free(first_inode); | |
757 | ||
758 | return result_inode_no; | |
759 | } | |
760 | ||
76a29519 | 761 | static int unlink_filename(char *filename, unsigned int blknr) |
ed34f34d | 762 | { |
ed34f34d US |
763 | int totalbytes = 0; |
764 | int templength = 0; | |
765 | int status, inodeno; | |
766 | int found = 0; | |
767 | char *root_first_block_buffer = NULL; | |
ed34f34d US |
768 | struct ext2_dirent *dir = NULL; |
769 | struct ext2_dirent *previous_dir = NULL; | |
770 | char *ptr = NULL; | |
771 | struct ext_filesystem *fs = get_fs(); | |
d56b2015 | 772 | int ret = -1; |
ed34f34d US |
773 | |
774 | /* get the first block of root */ | |
ed34f34d US |
775 | root_first_block_buffer = zalloc(fs->blksz); |
776 | if (!root_first_block_buffer) | |
777 | return -ENOMEM; | |
76a29519 | 778 | status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, |
ed34f34d US |
779 | fs->blksz, root_first_block_buffer); |
780 | if (status == 0) | |
781 | goto fail; | |
782 | ||
76a29519 | 783 | if (ext4fs_log_journal(root_first_block_buffer, blknr)) |
ed34f34d US |
784 | goto fail; |
785 | dir = (struct ext2_dirent *)root_first_block_buffer; | |
786 | ptr = (char *)dir; | |
787 | totalbytes = 0; | |
58a9ecba | 788 | while (le16_to_cpu(dir->direntlen) >= 0) { |
ed34f34d US |
789 | /* |
790 | * blocksize-totalbytes because last | |
791 | * directory length i.e., *dir->direntlen | |
792 | * is free availble space in the block that | |
793 | * means it is a last entry of directory entry | |
794 | */ | |
76a29519 SB |
795 | if (dir->inode && (strlen(filename) == dir->namelen) && |
796 | (strncmp(ptr + sizeof(struct ext2_dirent), | |
797 | filename, dir->namelen) == 0)) { | |
798 | printf("file found, deleting\n"); | |
799 | inodeno = le32_to_cpu(dir->inode); | |
800 | if (previous_dir) { | |
58a9ecba | 801 | uint16_t new_len; |
58a9ecba MW |
802 | new_len = le16_to_cpu(previous_dir->direntlen); |
803 | new_len += le16_to_cpu(dir->direntlen); | |
804 | previous_dir->direntlen = cpu_to_le16(new_len); | |
76a29519 | 805 | } else { |
ed34f34d | 806 | dir->inode = 0; |
ed34f34d | 807 | } |
76a29519 SB |
808 | found = 1; |
809 | break; | |
ed34f34d US |
810 | } |
811 | ||
58a9ecba | 812 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) |
ed34f34d US |
813 | break; |
814 | ||
815 | /* traversing the each directory entry */ | |
58a9ecba | 816 | templength = le16_to_cpu(dir->direntlen); |
ed34f34d US |
817 | totalbytes = totalbytes + templength; |
818 | previous_dir = dir; | |
819 | dir = (struct ext2_dirent *)((char *)dir + templength); | |
820 | ptr = (char *)dir; | |
821 | } | |
822 | ||
823 | ||
824 | if (found == 1) { | |
76a29519 | 825 | if (ext4fs_put_metadata(root_first_block_buffer, blknr)) |
ed34f34d | 826 | goto fail; |
d56b2015 | 827 | ret = inodeno; |
ed34f34d US |
828 | } |
829 | fail: | |
830 | free(root_first_block_buffer); | |
831 | ||
d56b2015 | 832 | return ret; |
ed34f34d US |
833 | } |
834 | ||
76a29519 | 835 | int ext4fs_filename_unlink(char *filename) |
ed34f34d US |
836 | { |
837 | short direct_blk_idx = 0; | |
838 | long int blknr = -1; | |
839 | int inodeno = -1; | |
840 | ||
841 | /* read the block no allocated to a file */ | |
842 | for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; | |
843 | direct_blk_idx++) { | |
844 | blknr = read_allocated_block(g_parent_inode, direct_blk_idx); | |
845 | if (blknr == 0) | |
846 | break; | |
76a29519 | 847 | inodeno = unlink_filename(filename, blknr); |
ed34f34d US |
848 | if (inodeno != -1) |
849 | return inodeno; | |
850 | } | |
851 | ||
852 | return -1; | |
853 | } | |
854 | ||
58a9ecba | 855 | uint32_t ext4fs_get_new_blk_no(void) |
ed34f34d US |
856 | { |
857 | short i; | |
858 | short status; | |
859 | int remainder; | |
860 | unsigned int bg_idx; | |
861 | static int prev_bg_bitmap_index = -1; | |
58a9ecba | 862 | unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); |
ed34f34d US |
863 | struct ext_filesystem *fs = get_fs(); |
864 | char *journal_buffer = zalloc(fs->blksz); | |
865 | char *zero_buffer = zalloc(fs->blksz); | |
866 | if (!journal_buffer || !zero_buffer) | |
867 | goto fail; | |
73c15c63 | 868 | struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; |
ed34f34d US |
869 | |
870 | if (fs->first_pass_bbmap == 0) { | |
871 | for (i = 0; i < fs->no_blkgrp; i++) { | |
58a9ecba MW |
872 | if (le16_to_cpu(bgd[i].free_blocks)) { |
873 | if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_BLOCK_UNINIT) { | |
874 | uint16_t new_flags; | |
875 | put_ext4((uint64_t)le32_to_cpu(bgd[i].block_id) * fs->blksz, | |
ed34f34d | 876 | zero_buffer, fs->blksz); |
58a9ecba MW |
877 | new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_BLOCK_UNINIT; |
878 | bgd[i].bg_flags = cpu_to_le16(new_flags); | |
ed34f34d US |
879 | memcpy(fs->blk_bmaps[i], zero_buffer, |
880 | fs->blksz); | |
881 | } | |
882 | fs->curr_blkno = | |
883 | _get_new_blk_no(fs->blk_bmaps[i]); | |
884 | if (fs->curr_blkno == -1) | |
885 | /* if block bitmap is completely fill */ | |
886 | continue; | |
887 | fs->curr_blkno = fs->curr_blkno + | |
888 | (i * fs->blksz * 8); | |
889 | fs->first_pass_bbmap++; | |
58a9ecba MW |
890 | ext4fs_bg_free_blocks_dec(&bgd[i]); |
891 | ext4fs_sb_free_blocks_dec(fs->sb); | |
892 | status = ext4fs_devread( | |
893 | (lbaint_t)le32_to_cpu(bgd[i].block_id) * | |
ed34f34d US |
894 | fs->sect_perblk, 0, |
895 | fs->blksz, | |
896 | journal_buffer); | |
897 | if (status == 0) | |
898 | goto fail; | |
899 | if (ext4fs_log_journal(journal_buffer, | |
58a9ecba | 900 | le32_to_cpu(bgd[i].block_id))) |
ed34f34d US |
901 | goto fail; |
902 | goto success; | |
903 | } else { | |
904 | debug("no space left on block group %d\n", i); | |
905 | } | |
906 | } | |
907 | ||
908 | goto fail; | |
909 | } else { | |
910 | restart: | |
911 | fs->curr_blkno++; | |
912 | /* get the blockbitmap index respective to blockno */ | |
35dd055b ŁM |
913 | bg_idx = fs->curr_blkno / blk_per_grp; |
914 | if (fs->blksz == 1024) { | |
ed34f34d US |
915 | remainder = fs->curr_blkno % blk_per_grp; |
916 | if (!remainder) | |
917 | bg_idx--; | |
918 | } | |
919 | ||
920 | /* | |
921 | * To skip completely filled block group bitmaps | |
922 | * Optimize the block allocation | |
923 | */ | |
924 | if (bg_idx >= fs->no_blkgrp) | |
925 | goto fail; | |
926 | ||
73c15c63 | 927 | if (bgd[bg_idx].free_blocks == 0) { |
ed34f34d US |
928 | debug("block group %u is full. Skipping\n", bg_idx); |
929 | fs->curr_blkno = fs->curr_blkno + blk_per_grp; | |
930 | fs->curr_blkno--; | |
931 | goto restart; | |
932 | } | |
933 | ||
58a9ecba MW |
934 | if (le16_to_cpu(bgd[bg_idx].bg_flags) & EXT4_BG_BLOCK_UNINIT) { |
935 | uint16_t new_flags; | |
ed34f34d | 936 | memset(zero_buffer, '\0', fs->blksz); |
58a9ecba MW |
937 | put_ext4((uint64_t)le32_to_cpu(bgd[bg_idx].block_id) * fs->blksz, |
938 | zero_buffer, fs->blksz); | |
ed34f34d | 939 | memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); |
58a9ecba MW |
940 | new_flags = le16_to_cpu(bgd[bg_idx].bg_flags) & ~EXT4_BG_BLOCK_UNINIT; |
941 | bgd[bg_idx].bg_flags = cpu_to_le16(new_flags); | |
ed34f34d US |
942 | } |
943 | ||
944 | if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], | |
945 | bg_idx) != 0) { | |
946 | debug("going for restart for the block no %ld %u\n", | |
947 | fs->curr_blkno, bg_idx); | |
948 | goto restart; | |
949 | } | |
950 | ||
951 | /* journal backup */ | |
952 | if (prev_bg_bitmap_index != bg_idx) { | |
953 | memset(journal_buffer, '\0', fs->blksz); | |
58a9ecba MW |
954 | status = ext4fs_devread( |
955 | (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) | |
ed34f34d US |
956 | * fs->sect_perblk, |
957 | 0, fs->blksz, journal_buffer); | |
958 | if (status == 0) | |
959 | goto fail; | |
960 | if (ext4fs_log_journal(journal_buffer, | |
58a9ecba | 961 | le32_to_cpu(bgd[bg_idx].block_id))) |
ed34f34d US |
962 | goto fail; |
963 | ||
964 | prev_bg_bitmap_index = bg_idx; | |
965 | } | |
58a9ecba MW |
966 | ext4fs_bg_free_blocks_dec(&bgd[bg_idx]); |
967 | ext4fs_sb_free_blocks_dec(fs->sb); | |
ed34f34d US |
968 | goto success; |
969 | } | |
970 | success: | |
971 | free(journal_buffer); | |
972 | free(zero_buffer); | |
973 | ||
974 | return fs->curr_blkno; | |
975 | fail: | |
976 | free(journal_buffer); | |
977 | free(zero_buffer); | |
978 | ||
979 | return -1; | |
980 | } | |
981 | ||
982 | int ext4fs_get_new_inode_no(void) | |
983 | { | |
984 | short i; | |
985 | short status; | |
986 | unsigned int ibmap_idx; | |
987 | static int prev_inode_bitmap_index = -1; | |
58a9ecba | 988 | unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); |
ed34f34d US |
989 | struct ext_filesystem *fs = get_fs(); |
990 | char *journal_buffer = zalloc(fs->blksz); | |
991 | char *zero_buffer = zalloc(fs->blksz); | |
992 | if (!journal_buffer || !zero_buffer) | |
993 | goto fail; | |
73c15c63 | 994 | struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; |
ed34f34d US |
995 | |
996 | if (fs->first_pass_ibmap == 0) { | |
997 | for (i = 0; i < fs->no_blkgrp; i++) { | |
73c15c63 SG |
998 | if (bgd[i].free_inodes) { |
999 | if (bgd[i].bg_itable_unused != | |
1000 | bgd[i].free_inodes) | |
1001 | bgd[i].bg_itable_unused = | |
1002 | bgd[i].free_inodes; | |
58a9ecba MW |
1003 | if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_INODE_UNINIT) { |
1004 | int new_flags; | |
1005 | put_ext4((uint64_t)le32_to_cpu(bgd[i].inode_id) * fs->blksz, | |
ed34f34d | 1006 | zero_buffer, fs->blksz); |
58a9ecba MW |
1007 | new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_INODE_UNINIT; |
1008 | bgd[i].bg_flags = cpu_to_le16(new_flags); | |
ed34f34d US |
1009 | memcpy(fs->inode_bmaps[i], |
1010 | zero_buffer, fs->blksz); | |
1011 | } | |
1012 | fs->curr_inode_no = | |
1013 | _get_new_inode_no(fs->inode_bmaps[i]); | |
1014 | if (fs->curr_inode_no == -1) | |
1015 | /* if block bitmap is completely fill */ | |
1016 | continue; | |
1017 | fs->curr_inode_no = fs->curr_inode_no + | |
1018 | (i * inodes_per_grp); | |
1019 | fs->first_pass_ibmap++; | |
58a9ecba MW |
1020 | ext4fs_bg_free_inodes_dec(&bgd[i]); |
1021 | ext4fs_bg_itable_unused_dec(&bgd[i]); | |
1022 | ext4fs_sb_free_inodes_dec(fs->sb); | |
1023 | status = ext4fs_devread( | |
1024 | (lbaint_t)le32_to_cpu(bgd[i].inode_id) * | |
ed34f34d US |
1025 | fs->sect_perblk, 0, |
1026 | fs->blksz, | |
1027 | journal_buffer); | |
1028 | if (status == 0) | |
1029 | goto fail; | |
1030 | if (ext4fs_log_journal(journal_buffer, | |
58a9ecba | 1031 | le32_to_cpu(bgd[i].inode_id))) |
ed34f34d US |
1032 | goto fail; |
1033 | goto success; | |
1034 | } else | |
1035 | debug("no inode left on block group %d\n", i); | |
1036 | } | |
1037 | goto fail; | |
1038 | } else { | |
1039 | restart: | |
1040 | fs->curr_inode_no++; | |
1041 | /* get the blockbitmap index respective to blockno */ | |
1042 | ibmap_idx = fs->curr_inode_no / inodes_per_grp; | |
58a9ecba MW |
1043 | if (le16_to_cpu(bgd[ibmap_idx].bg_flags) & EXT4_BG_INODE_UNINIT) { |
1044 | int new_flags; | |
ed34f34d | 1045 | memset(zero_buffer, '\0', fs->blksz); |
58a9ecba MW |
1046 | put_ext4((uint64_t)le32_to_cpu(bgd[ibmap_idx].inode_id) * fs->blksz, |
1047 | zero_buffer, fs->blksz); | |
1048 | new_flags = le16_to_cpu(bgd[ibmap_idx].bg_flags) & ~EXT4_BG_INODE_UNINIT; | |
1049 | bgd[ibmap_idx].bg_flags = cpu_to_le16(new_flags); | |
ed34f34d US |
1050 | memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, |
1051 | fs->blksz); | |
1052 | } | |
1053 | ||
1054 | if (ext4fs_set_inode_bmap(fs->curr_inode_no, | |
1055 | fs->inode_bmaps[ibmap_idx], | |
1056 | ibmap_idx) != 0) { | |
1057 | debug("going for restart for the block no %d %u\n", | |
1058 | fs->curr_inode_no, ibmap_idx); | |
1059 | goto restart; | |
1060 | } | |
1061 | ||
1062 | /* journal backup */ | |
1063 | if (prev_inode_bitmap_index != ibmap_idx) { | |
1064 | memset(journal_buffer, '\0', fs->blksz); | |
58a9ecba MW |
1065 | status = ext4fs_devread( |
1066 | (lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id) | |
ed34f34d US |
1067 | * fs->sect_perblk, |
1068 | 0, fs->blksz, journal_buffer); | |
1069 | if (status == 0) | |
1070 | goto fail; | |
1071 | if (ext4fs_log_journal(journal_buffer, | |
58a9ecba | 1072 | le32_to_cpu(bgd[ibmap_idx].inode_id))) |
ed34f34d US |
1073 | goto fail; |
1074 | prev_inode_bitmap_index = ibmap_idx; | |
1075 | } | |
73c15c63 SG |
1076 | if (bgd[ibmap_idx].bg_itable_unused != |
1077 | bgd[ibmap_idx].free_inodes) | |
1078 | bgd[ibmap_idx].bg_itable_unused = | |
1079 | bgd[ibmap_idx].free_inodes; | |
58a9ecba MW |
1080 | ext4fs_bg_free_inodes_dec(&bgd[ibmap_idx]); |
1081 | ext4fs_bg_itable_unused_dec(&bgd[ibmap_idx]); | |
1082 | ext4fs_sb_free_inodes_dec(fs->sb); | |
ed34f34d US |
1083 | goto success; |
1084 | } | |
1085 | ||
1086 | success: | |
1087 | free(journal_buffer); | |
1088 | free(zero_buffer); | |
1089 | ||
1090 | return fs->curr_inode_no; | |
1091 | fail: | |
1092 | free(journal_buffer); | |
1093 | free(zero_buffer); | |
1094 | ||
1095 | return -1; | |
1096 | ||
1097 | } | |
1098 | ||
1099 | ||
1100 | static void alloc_single_indirect_block(struct ext2_inode *file_inode, | |
1101 | unsigned int *total_remaining_blocks, | |
1102 | unsigned int *no_blks_reqd) | |
1103 | { | |
1104 | short i; | |
1105 | short status; | |
1106 | long int actual_block_no; | |
1107 | long int si_blockno; | |
1108 | /* si :single indirect */ | |
58a9ecba MW |
1109 | __le32 *si_buffer = NULL; |
1110 | __le32 *si_start_addr = NULL; | |
ed34f34d US |
1111 | struct ext_filesystem *fs = get_fs(); |
1112 | ||
1113 | if (*total_remaining_blocks != 0) { | |
1114 | si_buffer = zalloc(fs->blksz); | |
1115 | if (!si_buffer) { | |
1116 | printf("No Memory\n"); | |
1117 | return; | |
1118 | } | |
1119 | si_start_addr = si_buffer; | |
1120 | si_blockno = ext4fs_get_new_blk_no(); | |
1121 | if (si_blockno == -1) { | |
1122 | printf("no block left to assign\n"); | |
1123 | goto fail; | |
1124 | } | |
1125 | (*no_blks_reqd)++; | |
1126 | debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); | |
1127 | ||
04735e9c | 1128 | status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, |
ed34f34d US |
1129 | 0, fs->blksz, (char *)si_buffer); |
1130 | memset(si_buffer, '\0', fs->blksz); | |
1131 | if (status == 0) | |
1132 | goto fail; | |
1133 | ||
1134 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { | |
1135 | actual_block_no = ext4fs_get_new_blk_no(); | |
1136 | if (actual_block_no == -1) { | |
1137 | printf("no block left to assign\n"); | |
1138 | goto fail; | |
1139 | } | |
58a9ecba | 1140 | *si_buffer = cpu_to_le32(actual_block_no); |
ed34f34d US |
1141 | debug("SIAB %u: %u\n", *si_buffer, |
1142 | *total_remaining_blocks); | |
1143 | ||
1144 | si_buffer++; | |
1145 | (*total_remaining_blocks)--; | |
1146 | if (*total_remaining_blocks == 0) | |
1147 | break; | |
1148 | } | |
1149 | ||
1150 | /* write the block to disk */ | |
0550870b | 1151 | put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), |
ed34f34d | 1152 | si_start_addr, fs->blksz); |
58a9ecba | 1153 | file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); |
ed34f34d US |
1154 | } |
1155 | fail: | |
1156 | free(si_start_addr); | |
1157 | } | |
1158 | ||
1159 | static void alloc_double_indirect_block(struct ext2_inode *file_inode, | |
1160 | unsigned int *total_remaining_blocks, | |
1161 | unsigned int *no_blks_reqd) | |
1162 | { | |
1163 | short i; | |
1164 | short j; | |
1165 | short status; | |
1166 | long int actual_block_no; | |
1167 | /* di:double indirect */ | |
1168 | long int di_blockno_parent; | |
1169 | long int di_blockno_child; | |
58a9ecba MW |
1170 | __le32 *di_parent_buffer = NULL; |
1171 | __le32 *di_child_buff = NULL; | |
1172 | __le32 *di_block_start_addr = NULL; | |
1173 | __le32 *di_child_buff_start = NULL; | |
ed34f34d US |
1174 | struct ext_filesystem *fs = get_fs(); |
1175 | ||
1176 | if (*total_remaining_blocks != 0) { | |
1177 | /* double indirect parent block connecting to inode */ | |
1178 | di_blockno_parent = ext4fs_get_new_blk_no(); | |
1179 | if (di_blockno_parent == -1) { | |
1180 | printf("no block left to assign\n"); | |
1181 | goto fail; | |
1182 | } | |
1183 | di_parent_buffer = zalloc(fs->blksz); | |
1184 | if (!di_parent_buffer) | |
1185 | goto fail; | |
1186 | ||
1187 | di_block_start_addr = di_parent_buffer; | |
1188 | (*no_blks_reqd)++; | |
1189 | debug("DIPB %ld: %u\n", di_blockno_parent, | |
1190 | *total_remaining_blocks); | |
1191 | ||
04735e9c | 1192 | status = ext4fs_devread((lbaint_t)di_blockno_parent * |
ed34f34d US |
1193 | fs->sect_perblk, 0, |
1194 | fs->blksz, (char *)di_parent_buffer); | |
d429ca0d ŁM |
1195 | |
1196 | if (!status) { | |
1197 | printf("%s: Device read error!\n", __func__); | |
1198 | goto fail; | |
1199 | } | |
ed34f34d US |
1200 | memset(di_parent_buffer, '\0', fs->blksz); |
1201 | ||
1202 | /* | |
1203 | * start:for each double indirect parent | |
1204 | * block create one more block | |
1205 | */ | |
1206 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { | |
1207 | di_blockno_child = ext4fs_get_new_blk_no(); | |
1208 | if (di_blockno_child == -1) { | |
1209 | printf("no block left to assign\n"); | |
1210 | goto fail; | |
1211 | } | |
1212 | di_child_buff = zalloc(fs->blksz); | |
1213 | if (!di_child_buff) | |
1214 | goto fail; | |
1215 | ||
1216 | di_child_buff_start = di_child_buff; | |
58a9ecba | 1217 | *di_parent_buffer = cpu_to_le32(di_blockno_child); |
ed34f34d US |
1218 | di_parent_buffer++; |
1219 | (*no_blks_reqd)++; | |
1220 | debug("DICB %ld: %u\n", di_blockno_child, | |
1221 | *total_remaining_blocks); | |
1222 | ||
04735e9c | 1223 | status = ext4fs_devread((lbaint_t)di_blockno_child * |
ed34f34d US |
1224 | fs->sect_perblk, 0, |
1225 | fs->blksz, | |
1226 | (char *)di_child_buff); | |
d429ca0d ŁM |
1227 | |
1228 | if (!status) { | |
1229 | printf("%s: Device read error!\n", __func__); | |
1230 | goto fail; | |
1231 | } | |
ed34f34d US |
1232 | memset(di_child_buff, '\0', fs->blksz); |
1233 | /* filling of actual datablocks for each child */ | |
1234 | for (j = 0; j < (fs->blksz / sizeof(int)); j++) { | |
1235 | actual_block_no = ext4fs_get_new_blk_no(); | |
1236 | if (actual_block_no == -1) { | |
1237 | printf("no block left to assign\n"); | |
1238 | goto fail; | |
1239 | } | |
58a9ecba | 1240 | *di_child_buff = cpu_to_le32(actual_block_no); |
ed34f34d US |
1241 | debug("DIAB %ld: %u\n", actual_block_no, |
1242 | *total_remaining_blocks); | |
1243 | ||
1244 | di_child_buff++; | |
1245 | (*total_remaining_blocks)--; | |
1246 | if (*total_remaining_blocks == 0) | |
1247 | break; | |
1248 | } | |
1249 | /* write the block table */ | |
0550870b | 1250 | put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), |
ed34f34d US |
1251 | di_child_buff_start, fs->blksz); |
1252 | free(di_child_buff_start); | |
1253 | di_child_buff_start = NULL; | |
1254 | ||
1255 | if (*total_remaining_blocks == 0) | |
1256 | break; | |
1257 | } | |
0550870b | 1258 | put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), |
ed34f34d | 1259 | di_block_start_addr, fs->blksz); |
58a9ecba | 1260 | file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); |
ed34f34d US |
1261 | } |
1262 | fail: | |
1263 | free(di_block_start_addr); | |
1264 | } | |
1265 | ||
1266 | static void alloc_triple_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 k; | |
1273 | long int actual_block_no; | |
1274 | /* ti: Triple Indirect */ | |
1275 | long int ti_gp_blockno; | |
1276 | long int ti_parent_blockno; | |
1277 | long int ti_child_blockno; | |
58a9ecba MW |
1278 | __le32 *ti_gp_buff = NULL; |
1279 | __le32 *ti_parent_buff = NULL; | |
1280 | __le32 *ti_child_buff = NULL; | |
1281 | __le32 *ti_gp_buff_start_addr = NULL; | |
1282 | __le32 *ti_pbuff_start_addr = NULL; | |
1283 | __le32 *ti_cbuff_start_addr = NULL; | |
ed34f34d US |
1284 | struct ext_filesystem *fs = get_fs(); |
1285 | if (*total_remaining_blocks != 0) { | |
1286 | /* triple indirect grand parent block connecting to inode */ | |
1287 | ti_gp_blockno = ext4fs_get_new_blk_no(); | |
1288 | if (ti_gp_blockno == -1) { | |
1289 | printf("no block left to assign\n"); | |
495c3a1e | 1290 | return; |
ed34f34d US |
1291 | } |
1292 | ti_gp_buff = zalloc(fs->blksz); | |
1293 | if (!ti_gp_buff) | |
495c3a1e | 1294 | return; |
ed34f34d US |
1295 | |
1296 | ti_gp_buff_start_addr = ti_gp_buff; | |
1297 | (*no_blks_reqd)++; | |
1298 | debug("TIGPB %ld: %u\n", ti_gp_blockno, | |
1299 | *total_remaining_blocks); | |
1300 | ||
1301 | /* for each 4 byte grand parent entry create one more block */ | |
1302 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { | |
1303 | ti_parent_blockno = ext4fs_get_new_blk_no(); | |
1304 | if (ti_parent_blockno == -1) { | |
1305 | printf("no block left to assign\n"); | |
1306 | goto fail; | |
1307 | } | |
1308 | ti_parent_buff = zalloc(fs->blksz); | |
1309 | if (!ti_parent_buff) | |
1310 | goto fail; | |
1311 | ||
1312 | ti_pbuff_start_addr = ti_parent_buff; | |
58a9ecba | 1313 | *ti_gp_buff = cpu_to_le32(ti_parent_blockno); |
ed34f34d US |
1314 | ti_gp_buff++; |
1315 | (*no_blks_reqd)++; | |
1316 | debug("TIPB %ld: %u\n", ti_parent_blockno, | |
1317 | *total_remaining_blocks); | |
1318 | ||
1319 | /* for each 4 byte entry parent create one more block */ | |
1320 | for (j = 0; j < (fs->blksz / sizeof(int)); j++) { | |
1321 | ti_child_blockno = ext4fs_get_new_blk_no(); | |
1322 | if (ti_child_blockno == -1) { | |
1323 | printf("no block left assign\n"); | |
495c3a1e | 1324 | goto fail1; |
ed34f34d US |
1325 | } |
1326 | ti_child_buff = zalloc(fs->blksz); | |
1327 | if (!ti_child_buff) | |
495c3a1e | 1328 | goto fail1; |
ed34f34d US |
1329 | |
1330 | ti_cbuff_start_addr = ti_child_buff; | |
58a9ecba | 1331 | *ti_parent_buff = cpu_to_le32(ti_child_blockno); |
ed34f34d US |
1332 | ti_parent_buff++; |
1333 | (*no_blks_reqd)++; | |
1334 | debug("TICB %ld: %u\n", ti_parent_blockno, | |
1335 | *total_remaining_blocks); | |
1336 | ||
1337 | /* fill actual datablocks for each child */ | |
1338 | for (k = 0; k < (fs->blksz / sizeof(int)); | |
1339 | k++) { | |
1340 | actual_block_no = | |
1341 | ext4fs_get_new_blk_no(); | |
1342 | if (actual_block_no == -1) { | |
1343 | printf("no block left\n"); | |
495c3a1e TR |
1344 | free(ti_cbuff_start_addr); |
1345 | goto fail1; | |
ed34f34d | 1346 | } |
58a9ecba | 1347 | *ti_child_buff = cpu_to_le32(actual_block_no); |
ed34f34d US |
1348 | debug("TIAB %ld: %u\n", actual_block_no, |
1349 | *total_remaining_blocks); | |
1350 | ||
1351 | ti_child_buff++; | |
1352 | (*total_remaining_blocks)--; | |
1353 | if (*total_remaining_blocks == 0) | |
1354 | break; | |
1355 | } | |
1356 | /* write the child block */ | |
0550870b MH |
1357 | put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * |
1358 | (uint64_t)fs->blksz)), | |
ed34f34d US |
1359 | ti_cbuff_start_addr, fs->blksz); |
1360 | free(ti_cbuff_start_addr); | |
1361 | ||
1362 | if (*total_remaining_blocks == 0) | |
1363 | break; | |
1364 | } | |
1365 | /* write the parent block */ | |
0550870b | 1366 | put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), |
ed34f34d US |
1367 | ti_pbuff_start_addr, fs->blksz); |
1368 | free(ti_pbuff_start_addr); | |
1369 | ||
1370 | if (*total_remaining_blocks == 0) | |
1371 | break; | |
1372 | } | |
1373 | /* write the grand parent block */ | |
0550870b | 1374 | put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), |
ed34f34d | 1375 | ti_gp_buff_start_addr, fs->blksz); |
58a9ecba | 1376 | file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); |
495c3a1e TR |
1377 | free(ti_gp_buff_start_addr); |
1378 | return; | |
ed34f34d | 1379 | } |
495c3a1e TR |
1380 | fail1: |
1381 | free(ti_pbuff_start_addr); | |
ed34f34d US |
1382 | fail: |
1383 | free(ti_gp_buff_start_addr); | |
1384 | } | |
1385 | ||
1386 | void ext4fs_allocate_blocks(struct ext2_inode *file_inode, | |
1387 | unsigned int total_remaining_blocks, | |
1388 | unsigned int *total_no_of_block) | |
1389 | { | |
1390 | short i; | |
1391 | long int direct_blockno; | |
1392 | unsigned int no_blks_reqd = 0; | |
1393 | ||
1394 | /* allocation of direct blocks */ | |
d0180280 | 1395 | for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { |
ed34f34d US |
1396 | direct_blockno = ext4fs_get_new_blk_no(); |
1397 | if (direct_blockno == -1) { | |
1398 | printf("no block left to assign\n"); | |
1399 | return; | |
1400 | } | |
58a9ecba | 1401 | file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); |
ed34f34d US |
1402 | debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); |
1403 | ||
1404 | total_remaining_blocks--; | |
ed34f34d US |
1405 | } |
1406 | ||
1407 | alloc_single_indirect_block(file_inode, &total_remaining_blocks, | |
1408 | &no_blks_reqd); | |
1409 | alloc_double_indirect_block(file_inode, &total_remaining_blocks, | |
1410 | &no_blks_reqd); | |
1411 | alloc_triple_indirect_block(file_inode, &total_remaining_blocks, | |
1412 | &no_blks_reqd); | |
1413 | *total_no_of_block += no_blks_reqd; | |
1414 | } | |
1415 | ||
1416 | #endif | |
1417 | ||
a1596438 US |
1418 | static struct ext4_extent_header *ext4fs_get_extent_block |
1419 | (struct ext2_data *data, char *buf, | |
1420 | struct ext4_extent_header *ext_block, | |
1421 | uint32_t fileblock, int log2_blksz) | |
1422 | { | |
1423 | struct ext4_extent_idx *index; | |
1424 | unsigned long long block; | |
47017327 | 1425 | int blksz = EXT2_BLOCK_SIZE(data); |
a1596438 US |
1426 | int i; |
1427 | ||
1428 | while (1) { | |
1429 | index = (struct ext4_extent_idx *)(ext_block + 1); | |
1430 | ||
8b415f70 | 1431 | if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) |
58a9ecba | 1432 | return NULL; |
a1596438 US |
1433 | |
1434 | if (ext_block->eh_depth == 0) | |
1435 | return ext_block; | |
1436 | i = -1; | |
1437 | do { | |
1438 | i++; | |
8b415f70 | 1439 | if (i >= le16_to_cpu(ext_block->eh_entries)) |
a1596438 | 1440 | break; |
b5bbac1a | 1441 | } while (fileblock >= le32_to_cpu(index[i].ei_block)); |
a1596438 US |
1442 | |
1443 | if (--i < 0) | |
58a9ecba | 1444 | return NULL; |
a1596438 | 1445 | |
8b415f70 | 1446 | block = le16_to_cpu(index[i].ei_leaf_hi); |
a1596438 US |
1447 | block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); |
1448 | ||
47017327 | 1449 | if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, |
04735e9c | 1450 | buf)) |
a1596438 US |
1451 | ext_block = (struct ext4_extent_header *)buf; |
1452 | else | |
58a9ecba | 1453 | return NULL; |
a1596438 US |
1454 | } |
1455 | } | |
1456 | ||
1457 | static int ext4fs_blockgroup | |
1458 | (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) | |
1459 | { | |
1460 | long int blkno; | |
1461 | unsigned int blkoff, desc_per_blk; | |
50ce4c07 | 1462 | int log2blksz = get_fs()->dev_desc->log2blksz; |
a1596438 US |
1463 | |
1464 | desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group); | |
1465 | ||
7f101be3 | 1466 | blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + |
a1596438 US |
1467 | group / desc_per_blk; |
1468 | blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group); | |
1469 | ||
1470 | debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", | |
1471 | group, blkno, blkoff); | |
1472 | ||
04735e9c FL |
1473 | return ext4fs_devread((lbaint_t)blkno << |
1474 | (LOG2_BLOCK_SIZE(data) - log2blksz), | |
a1596438 US |
1475 | blkoff, sizeof(struct ext2_block_group), |
1476 | (char *)blkgrp); | |
1477 | } | |
1478 | ||
1479 | int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) | |
1480 | { | |
1481 | struct ext2_block_group blkgrp; | |
1482 | struct ext2_sblock *sblock = &data->sblock; | |
1483 | struct ext_filesystem *fs = get_fs(); | |
50ce4c07 | 1484 | int log2blksz = get_fs()->dev_desc->log2blksz; |
a1596438 US |
1485 | int inodes_per_block, status; |
1486 | long int blkno; | |
1487 | unsigned int blkoff; | |
1488 | ||
1489 | /* It is easier to calculate if the first inode is 0. */ | |
1490 | ino--; | |
7f101be3 | 1491 | status = ext4fs_blockgroup(data, ino / le32_to_cpu |
a1596438 US |
1492 | (sblock->inodes_per_group), &blkgrp); |
1493 | if (status == 0) | |
1494 | return 0; | |
1495 | ||
1496 | inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; | |
7f101be3 MW |
1497 | blkno = le32_to_cpu(blkgrp.inode_table_id) + |
1498 | (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; | |
a1596438 US |
1499 | blkoff = (ino % inodes_per_block) * fs->inodesz; |
1500 | /* Read the inode. */ | |
04735e9c FL |
1501 | status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - |
1502 | log2blksz), blkoff, | |
a1596438 US |
1503 | sizeof(struct ext2_inode), (char *)inode); |
1504 | if (status == 0) | |
1505 | return 0; | |
1506 | ||
1507 | return 1; | |
1508 | } | |
1509 | ||
1510 | long int read_allocated_block(struct ext2_inode *inode, int fileblock) | |
1511 | { | |
1512 | long int blknr; | |
1513 | int blksz; | |
1514 | int log2_blksz; | |
1515 | int status; | |
1516 | long int rblock; | |
1517 | long int perblock_parent; | |
1518 | long int perblock_child; | |
1519 | unsigned long long start; | |
1520 | /* get the blocksize of the filesystem */ | |
1521 | blksz = EXT2_BLOCK_SIZE(ext4fs_root); | |
50ce4c07 EE |
1522 | log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) |
1523 | - get_fs()->dev_desc->log2blksz; | |
1524 | ||
a1596438 US |
1525 | if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { |
1526 | char *buf = zalloc(blksz); | |
1527 | if (!buf) | |
1528 | return -ENOMEM; | |
1529 | struct ext4_extent_header *ext_block; | |
1530 | struct ext4_extent *extent; | |
1531 | int i = -1; | |
50ce4c07 EE |
1532 | ext_block = |
1533 | ext4fs_get_extent_block(ext4fs_root, buf, | |
1534 | (struct ext4_extent_header *) | |
1535 | inode->b.blocks.dir_blocks, | |
1536 | fileblock, log2_blksz); | |
a1596438 US |
1537 | if (!ext_block) { |
1538 | printf("invalid extent block\n"); | |
1539 | free(buf); | |
1540 | return -EINVAL; | |
1541 | } | |
1542 | ||
1543 | extent = (struct ext4_extent *)(ext_block + 1); | |
1544 | ||
1545 | do { | |
1546 | i++; | |
8b415f70 | 1547 | if (i >= le16_to_cpu(ext_block->eh_entries)) |
a1596438 US |
1548 | break; |
1549 | } while (fileblock >= le32_to_cpu(extent[i].ee_block)); | |
1550 | if (--i >= 0) { | |
1551 | fileblock -= le32_to_cpu(extent[i].ee_block); | |
8b415f70 | 1552 | if (fileblock >= le16_to_cpu(extent[i].ee_len)) { |
a1596438 US |
1553 | free(buf); |
1554 | return 0; | |
1555 | } | |
1556 | ||
8b415f70 | 1557 | start = le16_to_cpu(extent[i].ee_start_hi); |
a1596438 US |
1558 | start = (start << 32) + |
1559 | le32_to_cpu(extent[i].ee_start_lo); | |
1560 | free(buf); | |
1561 | return fileblock + start; | |
1562 | } | |
1563 | ||
1564 | printf("Extent Error\n"); | |
1565 | free(buf); | |
1566 | return -1; | |
1567 | } | |
1568 | ||
1569 | /* Direct blocks. */ | |
1570 | if (fileblock < INDIRECT_BLOCKS) | |
7f101be3 | 1571 | blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); |
a1596438 US |
1572 | |
1573 | /* Indirect. */ | |
1574 | else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { | |
1575 | if (ext4fs_indir1_block == NULL) { | |
1576 | ext4fs_indir1_block = zalloc(blksz); | |
1577 | if (ext4fs_indir1_block == NULL) { | |
1578 | printf("** SI ext2fs read block (indir 1)" | |
1579 | "malloc failed. **\n"); | |
1580 | return -1; | |
1581 | } | |
1582 | ext4fs_indir1_size = blksz; | |
1583 | ext4fs_indir1_blkno = -1; | |
1584 | } | |
1585 | if (blksz != ext4fs_indir1_size) { | |
1586 | free(ext4fs_indir1_block); | |
1587 | ext4fs_indir1_block = NULL; | |
1588 | ext4fs_indir1_size = 0; | |
1589 | ext4fs_indir1_blkno = -1; | |
1590 | ext4fs_indir1_block = zalloc(blksz); | |
1591 | if (ext4fs_indir1_block == NULL) { | |
1592 | printf("** SI ext2fs read block (indir 1):" | |
1593 | "malloc failed. **\n"); | |
1594 | return -1; | |
1595 | } | |
1596 | ext4fs_indir1_size = blksz; | |
1597 | } | |
7f101be3 | 1598 | if ((le32_to_cpu(inode->b.blocks.indir_block) << |
a1596438 US |
1599 | log2_blksz) != ext4fs_indir1_blkno) { |
1600 | status = | |
7f101be3 | 1601 | ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1602 | (inode->b.blocks. |
1603 | indir_block) << log2_blksz, 0, | |
1604 | blksz, (char *)ext4fs_indir1_block); | |
1605 | if (status == 0) { | |
1606 | printf("** SI ext2fs read block (indir 1)" | |
1607 | "failed. **\n"); | |
1608 | return 0; | |
1609 | } | |
1610 | ext4fs_indir1_blkno = | |
7f101be3 | 1611 | le32_to_cpu(inode->b.blocks. |
a1596438 US |
1612 | indir_block) << log2_blksz; |
1613 | } | |
7f101be3 | 1614 | blknr = le32_to_cpu(ext4fs_indir1_block |
a1596438 US |
1615 | [fileblock - INDIRECT_BLOCKS]); |
1616 | } | |
1617 | /* Double indirect. */ | |
1618 | else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * | |
1619 | (blksz / 4 + 1)))) { | |
1620 | ||
1621 | long int perblock = blksz / 4; | |
1622 | long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); | |
1623 | ||
1624 | if (ext4fs_indir1_block == NULL) { | |
1625 | ext4fs_indir1_block = zalloc(blksz); | |
1626 | if (ext4fs_indir1_block == NULL) { | |
1627 | printf("** DI ext2fs read block (indir 2 1)" | |
1628 | "malloc failed. **\n"); | |
1629 | return -1; | |
1630 | } | |
1631 | ext4fs_indir1_size = blksz; | |
1632 | ext4fs_indir1_blkno = -1; | |
1633 | } | |
1634 | if (blksz != ext4fs_indir1_size) { | |
1635 | free(ext4fs_indir1_block); | |
1636 | ext4fs_indir1_block = NULL; | |
1637 | ext4fs_indir1_size = 0; | |
1638 | ext4fs_indir1_blkno = -1; | |
1639 | ext4fs_indir1_block = zalloc(blksz); | |
1640 | if (ext4fs_indir1_block == NULL) { | |
1641 | printf("** DI ext2fs read block (indir 2 1)" | |
1642 | "malloc failed. **\n"); | |
1643 | return -1; | |
1644 | } | |
1645 | ext4fs_indir1_size = blksz; | |
1646 | } | |
7f101be3 | 1647 | if ((le32_to_cpu(inode->b.blocks.double_indir_block) << |
a1596438 US |
1648 | log2_blksz) != ext4fs_indir1_blkno) { |
1649 | status = | |
7f101be3 | 1650 | ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1651 | (inode->b.blocks. |
1652 | double_indir_block) << log2_blksz, | |
1653 | 0, blksz, | |
1654 | (char *)ext4fs_indir1_block); | |
1655 | if (status == 0) { | |
1656 | printf("** DI ext2fs read block (indir 2 1)" | |
1657 | "failed. **\n"); | |
1658 | return -1; | |
1659 | } | |
1660 | ext4fs_indir1_blkno = | |
7f101be3 | 1661 | le32_to_cpu(inode->b.blocks.double_indir_block) << |
a1596438 US |
1662 | log2_blksz; |
1663 | } | |
1664 | ||
1665 | if (ext4fs_indir2_block == NULL) { | |
1666 | ext4fs_indir2_block = zalloc(blksz); | |
1667 | if (ext4fs_indir2_block == NULL) { | |
1668 | printf("** DI ext2fs read block (indir 2 2)" | |
1669 | "malloc failed. **\n"); | |
1670 | return -1; | |
1671 | } | |
1672 | ext4fs_indir2_size = blksz; | |
1673 | ext4fs_indir2_blkno = -1; | |
1674 | } | |
1675 | if (blksz != ext4fs_indir2_size) { | |
1676 | free(ext4fs_indir2_block); | |
1677 | ext4fs_indir2_block = NULL; | |
1678 | ext4fs_indir2_size = 0; | |
1679 | ext4fs_indir2_blkno = -1; | |
1680 | ext4fs_indir2_block = zalloc(blksz); | |
1681 | if (ext4fs_indir2_block == NULL) { | |
1682 | printf("** DI ext2fs read block (indir 2 2)" | |
1683 | "malloc failed. **\n"); | |
1684 | return -1; | |
1685 | } | |
1686 | ext4fs_indir2_size = blksz; | |
1687 | } | |
7f101be3 | 1688 | if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << |
a1596438 | 1689 | log2_blksz) != ext4fs_indir2_blkno) { |
7f101be3 | 1690 | status = ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1691 | (ext4fs_indir1_block |
1692 | [rblock / | |
1693 | perblock]) << log2_blksz, 0, | |
1694 | blksz, | |
1695 | (char *)ext4fs_indir2_block); | |
1696 | if (status == 0) { | |
1697 | printf("** DI ext2fs read block (indir 2 2)" | |
1698 | "failed. **\n"); | |
1699 | return -1; | |
1700 | } | |
1701 | ext4fs_indir2_blkno = | |
7f101be3 | 1702 | le32_to_cpu(ext4fs_indir1_block[rblock |
a1596438 US |
1703 | / |
1704 | perblock]) << | |
1705 | log2_blksz; | |
1706 | } | |
7f101be3 | 1707 | blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); |
a1596438 US |
1708 | } |
1709 | /* Tripple indirect. */ | |
1710 | else { | |
1711 | rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + | |
1712 | (blksz / 4 * blksz / 4)); | |
1713 | perblock_child = blksz / 4; | |
1714 | perblock_parent = ((blksz / 4) * (blksz / 4)); | |
1715 | ||
1716 | if (ext4fs_indir1_block == NULL) { | |
1717 | ext4fs_indir1_block = zalloc(blksz); | |
1718 | if (ext4fs_indir1_block == NULL) { | |
1719 | printf("** TI ext2fs read block (indir 2 1)" | |
1720 | "malloc failed. **\n"); | |
1721 | return -1; | |
1722 | } | |
1723 | ext4fs_indir1_size = blksz; | |
1724 | ext4fs_indir1_blkno = -1; | |
1725 | } | |
1726 | if (blksz != ext4fs_indir1_size) { | |
1727 | free(ext4fs_indir1_block); | |
1728 | ext4fs_indir1_block = NULL; | |
1729 | ext4fs_indir1_size = 0; | |
1730 | ext4fs_indir1_blkno = -1; | |
1731 | ext4fs_indir1_block = zalloc(blksz); | |
1732 | if (ext4fs_indir1_block == NULL) { | |
1733 | printf("** TI ext2fs read block (indir 2 1)" | |
1734 | "malloc failed. **\n"); | |
1735 | return -1; | |
1736 | } | |
1737 | ext4fs_indir1_size = blksz; | |
1738 | } | |
7f101be3 | 1739 | if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << |
a1596438 US |
1740 | log2_blksz) != ext4fs_indir1_blkno) { |
1741 | status = ext4fs_devread | |
04735e9c | 1742 | ((lbaint_t) |
7f101be3 | 1743 | le32_to_cpu(inode->b.blocks.triple_indir_block) |
a1596438 US |
1744 | << log2_blksz, 0, blksz, |
1745 | (char *)ext4fs_indir1_block); | |
1746 | if (status == 0) { | |
1747 | printf("** TI ext2fs read block (indir 2 1)" | |
1748 | "failed. **\n"); | |
1749 | return -1; | |
1750 | } | |
1751 | ext4fs_indir1_blkno = | |
7f101be3 | 1752 | le32_to_cpu(inode->b.blocks.triple_indir_block) << |
a1596438 US |
1753 | log2_blksz; |
1754 | } | |
1755 | ||
1756 | if (ext4fs_indir2_block == NULL) { | |
1757 | ext4fs_indir2_block = zalloc(blksz); | |
1758 | if (ext4fs_indir2_block == NULL) { | |
1759 | printf("** TI ext2fs read block (indir 2 2)" | |
1760 | "malloc failed. **\n"); | |
1761 | return -1; | |
1762 | } | |
1763 | ext4fs_indir2_size = blksz; | |
1764 | ext4fs_indir2_blkno = -1; | |
1765 | } | |
1766 | if (blksz != ext4fs_indir2_size) { | |
1767 | free(ext4fs_indir2_block); | |
1768 | ext4fs_indir2_block = NULL; | |
1769 | ext4fs_indir2_size = 0; | |
1770 | ext4fs_indir2_blkno = -1; | |
1771 | ext4fs_indir2_block = zalloc(blksz); | |
1772 | if (ext4fs_indir2_block == NULL) { | |
1773 | printf("** TI ext2fs read block (indir 2 2)" | |
1774 | "malloc failed. **\n"); | |
1775 | return -1; | |
1776 | } | |
1777 | ext4fs_indir2_size = blksz; | |
1778 | } | |
7f101be3 | 1779 | if ((le32_to_cpu(ext4fs_indir1_block[rblock / |
a1596438 US |
1780 | perblock_parent]) << |
1781 | log2_blksz) | |
1782 | != ext4fs_indir2_blkno) { | |
7f101be3 | 1783 | status = ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1784 | (ext4fs_indir1_block |
1785 | [rblock / | |
1786 | perblock_parent]) << | |
1787 | log2_blksz, 0, blksz, | |
1788 | (char *)ext4fs_indir2_block); | |
1789 | if (status == 0) { | |
1790 | printf("** TI ext2fs read block (indir 2 2)" | |
1791 | "failed. **\n"); | |
1792 | return -1; | |
1793 | } | |
1794 | ext4fs_indir2_blkno = | |
7f101be3 | 1795 | le32_to_cpu(ext4fs_indir1_block[rblock / |
a1596438 US |
1796 | perblock_parent]) |
1797 | << log2_blksz; | |
1798 | } | |
1799 | ||
1800 | if (ext4fs_indir3_block == NULL) { | |
1801 | ext4fs_indir3_block = zalloc(blksz); | |
1802 | if (ext4fs_indir3_block == NULL) { | |
1803 | printf("** TI ext2fs read block (indir 2 2)" | |
1804 | "malloc failed. **\n"); | |
1805 | return -1; | |
1806 | } | |
1807 | ext4fs_indir3_size = blksz; | |
1808 | ext4fs_indir3_blkno = -1; | |
1809 | } | |
1810 | if (blksz != ext4fs_indir3_size) { | |
1811 | free(ext4fs_indir3_block); | |
1812 | ext4fs_indir3_block = NULL; | |
1813 | ext4fs_indir3_size = 0; | |
1814 | ext4fs_indir3_blkno = -1; | |
1815 | ext4fs_indir3_block = zalloc(blksz); | |
1816 | if (ext4fs_indir3_block == NULL) { | |
1817 | printf("** TI ext2fs read block (indir 2 2)" | |
1818 | "malloc failed. **\n"); | |
1819 | return -1; | |
1820 | } | |
1821 | ext4fs_indir3_size = blksz; | |
1822 | } | |
7f101be3 | 1823 | if ((le32_to_cpu(ext4fs_indir2_block[rblock |
a1596438 US |
1824 | / |
1825 | perblock_child]) << | |
1826 | log2_blksz) != ext4fs_indir3_blkno) { | |
1827 | status = | |
7f101be3 | 1828 | ext4fs_devread((lbaint_t)le32_to_cpu |
a1596438 US |
1829 | (ext4fs_indir2_block |
1830 | [(rblock / perblock_child) | |
1831 | % (blksz / 4)]) << log2_blksz, 0, | |
1832 | blksz, (char *)ext4fs_indir3_block); | |
1833 | if (status == 0) { | |
1834 | printf("** TI ext2fs read block (indir 2 2)" | |
1835 | "failed. **\n"); | |
1836 | return -1; | |
1837 | } | |
1838 | ext4fs_indir3_blkno = | |
7f101be3 | 1839 | le32_to_cpu(ext4fs_indir2_block[(rblock / |
a1596438 US |
1840 | perblock_child) % |
1841 | (blksz / | |
1842 | 4)]) << | |
1843 | log2_blksz; | |
1844 | } | |
1845 | ||
7f101be3 | 1846 | blknr = le32_to_cpu(ext4fs_indir3_block |
a1596438 US |
1847 | [rblock % perblock_child]); |
1848 | } | |
50ce4c07 | 1849 | debug("read_allocated_block %ld\n", blknr); |
a1596438 US |
1850 | |
1851 | return blknr; | |
1852 | } | |
1853 | ||
8b454eee ŁM |
1854 | /** |
1855 | * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's | |
1856 | * global pointers | |
1857 | * | |
1858 | * This function assures that for a file with the same name but different size | |
1859 | * the sequential store on the ext4 filesystem will be correct. | |
1860 | * | |
1861 | * In this function the global data, responsible for internal representation | |
1862 | * of the ext4 data are initialized to the reset state. Without this, during | |
1863 | * replacement of the smaller file with the bigger truncation of new file was | |
1864 | * performed. | |
1865 | */ | |
1866 | void ext4fs_reinit_global(void) | |
a1596438 | 1867 | { |
a1596438 US |
1868 | if (ext4fs_indir1_block != NULL) { |
1869 | free(ext4fs_indir1_block); | |
1870 | ext4fs_indir1_block = NULL; | |
1871 | ext4fs_indir1_size = 0; | |
1872 | ext4fs_indir1_blkno = -1; | |
1873 | } | |
1874 | if (ext4fs_indir2_block != NULL) { | |
1875 | free(ext4fs_indir2_block); | |
1876 | ext4fs_indir2_block = NULL; | |
1877 | ext4fs_indir2_size = 0; | |
1878 | ext4fs_indir2_blkno = -1; | |
1879 | } | |
1880 | if (ext4fs_indir3_block != NULL) { | |
1881 | free(ext4fs_indir3_block); | |
1882 | ext4fs_indir3_block = NULL; | |
1883 | ext4fs_indir3_size = 0; | |
1884 | ext4fs_indir3_blkno = -1; | |
1885 | } | |
1886 | } | |
8b454eee ŁM |
1887 | void ext4fs_close(void) |
1888 | { | |
1889 | if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { | |
1890 | ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); | |
1891 | ext4fs_file = NULL; | |
1892 | } | |
1893 | if (ext4fs_root != NULL) { | |
1894 | free(ext4fs_root); | |
1895 | ext4fs_root = NULL; | |
1896 | } | |
1897 | ||
1898 | ext4fs_reinit_global(); | |
1899 | } | |
a1596438 US |
1900 | |
1901 | int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, | |
1902 | struct ext2fs_node **fnode, int *ftype) | |
1903 | { | |
1904 | unsigned int fpos = 0; | |
1905 | int status; | |
9f12cd0e | 1906 | loff_t actread; |
a1596438 US |
1907 | struct ext2fs_node *diro = (struct ext2fs_node *) dir; |
1908 | ||
1909 | #ifdef DEBUG | |
1910 | if (name != NULL) | |
1911 | printf("Iterate dir %s\n", name); | |
1912 | #endif /* of DEBUG */ | |
1913 | if (!diro->inode_read) { | |
1914 | status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); | |
1915 | if (status == 0) | |
1916 | return 0; | |
1917 | } | |
1918 | /* Search the file. */ | |
7f101be3 | 1919 | while (fpos < le32_to_cpu(diro->inode.size)) { |
a1596438 US |
1920 | struct ext2_dirent dirent; |
1921 | ||
1922 | status = ext4fs_read_file(diro, fpos, | |
1923 | sizeof(struct ext2_dirent), | |
9f12cd0e SR |
1924 | (char *)&dirent, &actread); |
1925 | if (status < 0) | |
a1596438 US |
1926 | return 0; |
1927 | ||
54d68e93 TF |
1928 | if (dirent.direntlen == 0) { |
1929 | printf("Failed to iterate over directory %s\n", name); | |
1930 | return 0; | |
1931 | } | |
1932 | ||
a1596438 US |
1933 | if (dirent.namelen != 0) { |
1934 | char filename[dirent.namelen + 1]; | |
1935 | struct ext2fs_node *fdiro; | |
1936 | int type = FILETYPE_UNKNOWN; | |
1937 | ||
1938 | status = ext4fs_read_file(diro, | |
1939 | fpos + | |
1940 | sizeof(struct ext2_dirent), | |
9f12cd0e SR |
1941 | dirent.namelen, filename, |
1942 | &actread); | |
1943 | if (status < 0) | |
a1596438 US |
1944 | return 0; |
1945 | ||
1946 | fdiro = zalloc(sizeof(struct ext2fs_node)); | |
1947 | if (!fdiro) | |
1948 | return 0; | |
1949 | ||
1950 | fdiro->data = diro->data; | |
7f101be3 | 1951 | fdiro->ino = le32_to_cpu(dirent.inode); |
a1596438 US |
1952 | |
1953 | filename[dirent.namelen] = '\0'; | |
1954 | ||
1955 | if (dirent.filetype != FILETYPE_UNKNOWN) { | |
1956 | fdiro->inode_read = 0; | |
1957 | ||
1958 | if (dirent.filetype == FILETYPE_DIRECTORY) | |
1959 | type = FILETYPE_DIRECTORY; | |
1960 | else if (dirent.filetype == FILETYPE_SYMLINK) | |
1961 | type = FILETYPE_SYMLINK; | |
1962 | else if (dirent.filetype == FILETYPE_REG) | |
1963 | type = FILETYPE_REG; | |
1964 | } else { | |
1965 | status = ext4fs_read_inode(diro->data, | |
7f101be3 | 1966 | le32_to_cpu |
a1596438 US |
1967 | (dirent.inode), |
1968 | &fdiro->inode); | |
1969 | if (status == 0) { | |
1970 | free(fdiro); | |
1971 | return 0; | |
1972 | } | |
1973 | fdiro->inode_read = 1; | |
1974 | ||
7f101be3 | 1975 | if ((le16_to_cpu(fdiro->inode.mode) & |
a1596438 US |
1976 | FILETYPE_INO_MASK) == |
1977 | FILETYPE_INO_DIRECTORY) { | |
1978 | type = FILETYPE_DIRECTORY; | |
7f101be3 | 1979 | } else if ((le16_to_cpu(fdiro->inode.mode) |
a1596438 US |
1980 | & FILETYPE_INO_MASK) == |
1981 | FILETYPE_INO_SYMLINK) { | |
1982 | type = FILETYPE_SYMLINK; | |
7f101be3 | 1983 | } else if ((le16_to_cpu(fdiro->inode.mode) |
a1596438 US |
1984 | & FILETYPE_INO_MASK) == |
1985 | FILETYPE_INO_REG) { | |
1986 | type = FILETYPE_REG; | |
1987 | } | |
1988 | } | |
1989 | #ifdef DEBUG | |
1990 | printf("iterate >%s<\n", filename); | |
1991 | #endif /* of DEBUG */ | |
1992 | if ((name != NULL) && (fnode != NULL) | |
1993 | && (ftype != NULL)) { | |
1994 | if (strcmp(filename, name) == 0) { | |
1995 | *ftype = type; | |
1996 | *fnode = fdiro; | |
1997 | return 1; | |
1998 | } | |
1999 | } else { | |
2000 | if (fdiro->inode_read == 0) { | |
2001 | status = ext4fs_read_inode(diro->data, | |
7f101be3 | 2002 | le32_to_cpu( |
a1596438 US |
2003 | dirent.inode), |
2004 | &fdiro->inode); | |
2005 | if (status == 0) { | |
2006 | free(fdiro); | |
2007 | return 0; | |
2008 | } | |
2009 | fdiro->inode_read = 1; | |
2010 | } | |
2011 | switch (type) { | |
2012 | case FILETYPE_DIRECTORY: | |
2013 | printf("<DIR> "); | |
2014 | break; | |
2015 | case FILETYPE_SYMLINK: | |
2016 | printf("<SYM> "); | |
2017 | break; | |
2018 | case FILETYPE_REG: | |
2019 | printf(" "); | |
2020 | break; | |
2021 | default: | |
2022 | printf("< ? > "); | |
2023 | break; | |
2024 | } | |
9f12cd0e | 2025 | printf("%10u %s\n", |
7f101be3 | 2026 | le32_to_cpu(fdiro->inode.size), |
a1596438 US |
2027 | filename); |
2028 | } | |
2029 | free(fdiro); | |
2030 | } | |
7f101be3 | 2031 | fpos += le16_to_cpu(dirent.direntlen); |
a1596438 US |
2032 | } |
2033 | return 0; | |
2034 | } | |
2035 | ||
2036 | static char *ext4fs_read_symlink(struct ext2fs_node *node) | |
2037 | { | |
2038 | char *symlink; | |
2039 | struct ext2fs_node *diro = node; | |
2040 | int status; | |
9f12cd0e | 2041 | loff_t actread; |
a1596438 US |
2042 | |
2043 | if (!diro->inode_read) { | |
2044 | status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); | |
2045 | if (status == 0) | |
58a9ecba | 2046 | return NULL; |
a1596438 | 2047 | } |
7f101be3 | 2048 | symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); |
a1596438 | 2049 | if (!symlink) |
58a9ecba | 2050 | return NULL; |
a1596438 | 2051 | |
7f101be3 | 2052 | if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { |
a1596438 | 2053 | strncpy(symlink, diro->inode.b.symlink, |
7f101be3 | 2054 | le32_to_cpu(diro->inode.size)); |
a1596438 US |
2055 | } else { |
2056 | status = ext4fs_read_file(diro, 0, | |
7f101be3 | 2057 | le32_to_cpu(diro->inode.size), |
9f12cd0e | 2058 | symlink, &actread); |
9d2f6a9a | 2059 | if ((status < 0) || (actread == 0)) { |
a1596438 | 2060 | free(symlink); |
58a9ecba | 2061 | return NULL; |
a1596438 US |
2062 | } |
2063 | } | |
7f101be3 | 2064 | symlink[le32_to_cpu(diro->inode.size)] = '\0'; |
a1596438 US |
2065 | return symlink; |
2066 | } | |
2067 | ||
2068 | static int ext4fs_find_file1(const char *currpath, | |
2069 | struct ext2fs_node *currroot, | |
2070 | struct ext2fs_node **currfound, int *foundtype) | |
2071 | { | |
2072 | char fpath[strlen(currpath) + 1]; | |
2073 | char *name = fpath; | |
2074 | char *next; | |
2075 | int status; | |
2076 | int type = FILETYPE_DIRECTORY; | |
2077 | struct ext2fs_node *currnode = currroot; | |
2078 | struct ext2fs_node *oldnode = currroot; | |
2079 | ||
2080 | strncpy(fpath, currpath, strlen(currpath) + 1); | |
2081 | ||
2082 | /* Remove all leading slashes. */ | |
2083 | while (*name == '/') | |
2084 | name++; | |
2085 | ||
2086 | if (!*name) { | |
2087 | *currfound = currnode; | |
2088 | return 1; | |
2089 | } | |
2090 | ||
2091 | for (;;) { | |
2092 | int found; | |
2093 | ||
2094 | /* Extract the actual part from the pathname. */ | |
2095 | next = strchr(name, '/'); | |
2096 | if (next) { | |
2097 | /* Remove all leading slashes. */ | |
2098 | while (*next == '/') | |
2099 | *(next++) = '\0'; | |
2100 | } | |
2101 | ||
2102 | if (type != FILETYPE_DIRECTORY) { | |
2103 | ext4fs_free_node(currnode, currroot); | |
2104 | return 0; | |
2105 | } | |
2106 | ||
2107 | oldnode = currnode; | |
2108 | ||
2109 | /* Iterate over the directory. */ | |
2110 | found = ext4fs_iterate_dir(currnode, name, &currnode, &type); | |
2111 | if (found == 0) | |
2112 | return 0; | |
2113 | ||
2114 | if (found == -1) | |
2115 | break; | |
2116 | ||
2117 | /* Read in the symlink and follow it. */ | |
2118 | if (type == FILETYPE_SYMLINK) { | |
2119 | char *symlink; | |
2120 | ||
2121 | /* Test if the symlink does not loop. */ | |
2122 | if (++symlinknest == 8) { | |
2123 | ext4fs_free_node(currnode, currroot); | |
2124 | ext4fs_free_node(oldnode, currroot); | |
2125 | return 0; | |
2126 | } | |
2127 | ||
2128 | symlink = ext4fs_read_symlink(currnode); | |
2129 | ext4fs_free_node(currnode, currroot); | |
2130 | ||
2131 | if (!symlink) { | |
2132 | ext4fs_free_node(oldnode, currroot); | |
2133 | return 0; | |
2134 | } | |
2135 | ||
2136 | debug("Got symlink >%s<\n", symlink); | |
2137 | ||
2138 | if (symlink[0] == '/') { | |
2139 | ext4fs_free_node(oldnode, currroot); | |
2140 | oldnode = &ext4fs_root->diropen; | |
2141 | } | |
2142 | ||
2143 | /* Lookup the node the symlink points to. */ | |
2144 | status = ext4fs_find_file1(symlink, oldnode, | |
2145 | &currnode, &type); | |
2146 | ||
2147 | free(symlink); | |
2148 | ||
2149 | if (status == 0) { | |
2150 | ext4fs_free_node(oldnode, currroot); | |
2151 | return 0; | |
2152 | } | |
2153 | } | |
2154 | ||
2155 | ext4fs_free_node(oldnode, currroot); | |
2156 | ||
2157 | /* Found the node! */ | |
2158 | if (!next || *next == '\0') { | |
2159 | *currfound = currnode; | |
2160 | *foundtype = type; | |
2161 | return 1; | |
2162 | } | |
2163 | name = next; | |
2164 | } | |
2165 | return -1; | |
2166 | } | |
2167 | ||
2168 | int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, | |
2169 | struct ext2fs_node **foundnode, int expecttype) | |
2170 | { | |
2171 | int status; | |
2172 | int foundtype = FILETYPE_DIRECTORY; | |
2173 | ||
2174 | symlinknest = 0; | |
2175 | if (!path) | |
2176 | return 0; | |
2177 | ||
2178 | status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); | |
2179 | if (status == 0) | |
2180 | return 0; | |
2181 | ||
2182 | /* Check if the node that was found was of the expected type. */ | |
2183 | if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) | |
2184 | return 0; | |
2185 | else if ((expecttype == FILETYPE_DIRECTORY) | |
2186 | && (foundtype != expecttype)) | |
2187 | return 0; | |
2188 | ||
2189 | return 1; | |
2190 | } | |
2191 | ||
9f12cd0e | 2192 | int ext4fs_open(const char *filename, loff_t *len) |
a1596438 US |
2193 | { |
2194 | struct ext2fs_node *fdiro = NULL; | |
2195 | int status; | |
a1596438 US |
2196 | |
2197 | if (ext4fs_root == NULL) | |
2198 | return -1; | |
2199 | ||
2200 | ext4fs_file = NULL; | |
2201 | status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, | |
2202 | FILETYPE_REG); | |
2203 | if (status == 0) | |
2204 | goto fail; | |
2205 | ||
2206 | if (!fdiro->inode_read) { | |
2207 | status = ext4fs_read_inode(fdiro->data, fdiro->ino, | |
2208 | &fdiro->inode); | |
2209 | if (status == 0) | |
2210 | goto fail; | |
2211 | } | |
7f101be3 | 2212 | *len = le32_to_cpu(fdiro->inode.size); |
a1596438 US |
2213 | ext4fs_file = fdiro; |
2214 | ||
9f12cd0e | 2215 | return 0; |
a1596438 US |
2216 | fail: |
2217 | ext4fs_free_node(fdiro, &ext4fs_root->diropen); | |
2218 | ||
2219 | return -1; | |
2220 | } | |
2221 | ||
2222 | int ext4fs_mount(unsigned part_length) | |
2223 | { | |
2224 | struct ext2_data *data; | |
2225 | int status; | |
2226 | struct ext_filesystem *fs = get_fs(); | |
50ce4c07 | 2227 | data = zalloc(SUPERBLOCK_SIZE); |
a1596438 US |
2228 | if (!data) |
2229 | return 0; | |
2230 | ||
2231 | /* Read the superblock. */ | |
50ce4c07 | 2232 | status = ext4_read_superblock((char *)&data->sblock); |
a1596438 US |
2233 | |
2234 | if (status == 0) | |
2235 | goto fail; | |
2236 | ||
2237 | /* Make sure this is an ext2 filesystem. */ | |
7f101be3 | 2238 | if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) |
a1596438 US |
2239 | goto fail; |
2240 | ||
6f94ab66 TR |
2241 | /* |
2242 | * The 64bit feature was enabled when metadata_csum was enabled | |
2243 | * and we do not support metadata_csum (and cannot reliably find | |
2244 | * files when it is set. Refuse to mount. | |
2245 | */ | |
58a9ecba | 2246 | if (le32_to_cpu(data->sblock.feature_incompat) & EXT4_FEATURE_INCOMPAT_64BIT) { |
6f94ab66 TR |
2247 | printf("Unsupported feature found (64bit, possibly metadata_csum), not mounting\n"); |
2248 | goto fail; | |
2249 | } | |
2250 | ||
011bc334 | 2251 | if (le32_to_cpu(data->sblock.revision_level) == 0) |
a1596438 US |
2252 | fs->inodesz = 128; |
2253 | else | |
7f101be3 | 2254 | fs->inodesz = le16_to_cpu(data->sblock.inode_size); |
a1596438 US |
2255 | |
2256 | debug("EXT2 rev %d, inode_size %d\n", | |
7f101be3 | 2257 | le32_to_cpu(data->sblock.revision_level), fs->inodesz); |
a1596438 US |
2258 | |
2259 | data->diropen.data = data; | |
2260 | data->diropen.ino = 2; | |
2261 | data->diropen.inode_read = 1; | |
2262 | data->inode = &data->diropen.inode; | |
2263 | ||
2264 | status = ext4fs_read_inode(data, 2, data->inode); | |
2265 | if (status == 0) | |
2266 | goto fail; | |
2267 | ||
2268 | ext4fs_root = data; | |
2269 | ||
2270 | return 1; | |
2271 | fail: | |
2272 | printf("Failed to mount ext2 filesystem...\n"); | |
2273 | free(data); | |
2274 | ext4fs_root = NULL; | |
2275 | ||
2276 | return 0; | |
2277 | } |