Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 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 | * |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 17 | * ext4write : Based on generic ext4 protocol. |
| 18 | * |
Wolfgang Denk | 1a45966 | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 19 | * SPDX-License-Identifier: GPL-2.0+ |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 20 | */ |
| 21 | |
| 22 | #include <common.h> |
| 23 | #include <ext_common.h> |
| 24 | #include <ext4fs.h> |
Simon Glass | aac618a | 2014-10-15 04:38:32 -0600 | [diff] [blame] | 25 | #include <inttypes.h> |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 26 | #include <malloc.h> |
Simon Glass | cf92e05 | 2015-09-02 17:24:58 -0600 | [diff] [blame] | 27 | #include <memalign.h> |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 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; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 36 | __le32 *ext4fs_indir1_block; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 37 | int ext4fs_indir1_size; |
| 38 | int ext4fs_indir1_blkno = -1; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 39 | __le32 *ext4fs_indir2_block; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 40 | int ext4fs_indir2_size; |
| 41 | int ext4fs_indir2_blkno = -1; |
| 42 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 43 | __le32 *ext4fs_indir3_block; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 44 | int ext4fs_indir3_size; |
| 45 | int ext4fs_indir3_blkno = -1; |
| 46 | struct ext2_inode *g_parent_inode; |
| 47 | static int symlinknest; |
| 48 | |
Stephen Warren | 03e2ecf | 2012-10-22 06:43:50 +0000 | [diff] [blame] | 49 | #if defined(CONFIG_EXT4_WRITE) |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 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 | |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 89 | struct ext_filesystem *fs = get_fs(); |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 90 | int log2blksz = fs->dev_desc->log2blksz; |
| 91 | ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 92 | |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 93 | startblock = off >> log2blksz; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 94 | startblock += part_offset; |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 95 | remainder = off & (uint64_t)(fs->dev_desc->blksz - 1); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 96 | |
| 97 | if (fs->dev_desc == NULL) |
| 98 | return; |
| 99 | |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 100 | if ((startblock + (size >> log2blksz)) > |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 101 | (part_offset + fs->total_sect)) { |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 102 | printf("part_offset is " LBAFU "\n", part_offset); |
Simon Glass | aac618a | 2014-10-15 04:38:32 -0600 | [diff] [blame] | 103 | printf("total_sector is %" PRIu64 "\n", fs->total_sect); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 104 | printf("error: overflow occurs\n"); |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | if (remainder) { |
Simon Glass | 2a981dc | 2016-02-29 15:25:52 -0700 | [diff] [blame] | 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); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 113 | } else { |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 114 | if (size >> log2blksz != 0) { |
Simon Glass | 2a981dc | 2016-02-29 15:25:52 -0700 | [diff] [blame] | 115 | blk_dwrite(fs->dev_desc, startblock, size >> log2blksz, |
| 116 | (unsigned long *)buf); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 117 | } else { |
Simon Glass | 2a981dc | 2016-02-29 15:25:52 -0700 | [diff] [blame] | 118 | blk_dread(fs->dev_desc, startblock, 1, sec_buf); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 119 | temp_ptr = sec_buf; |
| 120 | memcpy(temp_ptr, buf, size); |
Simon Glass | 2a981dc | 2016-02-29 15:25:52 -0700 | [diff] [blame] | 121 | blk_dwrite(fs->dev_desc, startblock, 1, |
| 122 | (unsigned long *)sec_buf); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 140 | if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group)) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 277 | inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 302 | inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 317 | uint16_t ext4fs_checksum_update(uint32_t i) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 318 | { |
| 319 | struct ext2_block_group *desc; |
| 320 | struct ext_filesystem *fs = get_fs(); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 321 | uint16_t crc = 0; |
| 322 | __le32 le32_i = cpu_to_le32(i); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 323 | |
Simon Glass | 73c15c6 | 2012-10-03 11:37:49 +0000 | [diff] [blame] | 324 | desc = (struct ext2_block_group *)&fs->bgd[i]; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 325 | if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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)); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 330 | crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i)); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 351 | sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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) { |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 362 | dir->direntlen = cpu_to_le16(dentry_length); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 363 | return sizeof_void_space; |
| 364 | } |
| 365 | |
| 366 | return 0; |
| 367 | } |
| 368 | |
Stefan Brüns | a0d767e | 2016-09-06 04:36:42 +0200 | [diff] [blame] | 369 | int ext4fs_update_parent_dentry(char *filename, int file_type) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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; |
Stefan Brüns | a0d767e | 2016-09-06 04:36:42 +0200 | [diff] [blame] | 383 | int inodeno = -1; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 384 | int status; |
| 385 | struct ext_filesystem *fs = get_fs(); |
| 386 | /* directory entry */ |
| 387 | struct ext2_dirent *dir; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 388 | char *temp_dir = NULL; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 389 | uint32_t new_blk_no; |
| 390 | uint32_t new_size; |
| 391 | uint32_t new_blockcnt; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 392 | |
| 393 | zero_buffer = zalloc(fs->blksz); |
| 394 | if (!zero_buffer) { |
| 395 | printf("No Memory\n"); |
Stefan Brüns | a0d767e | 2016-09-06 04:36:42 +0200 | [diff] [blame] | 396 | return -1; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 397 | } |
| 398 | root_first_block_buffer = zalloc(fs->blksz); |
| 399 | if (!root_first_block_buffer) { |
| 400 | free(zero_buffer); |
| 401 | printf("No Memory\n"); |
Stefan Brüns | a0d767e | 2016-09-06 04:36:42 +0200 | [diff] [blame] | 402 | return -1; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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 | |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 418 | status = ext4fs_devread((lbaint_t)first_block_no_of_root |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 427 | totalbytes = 0; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 428 | while (le16_to_cpu(dir->direntlen) > 0) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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 */ |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 437 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 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) { |
Stefan Brüns | b96c3c7 | 2016-09-06 04:36:43 +0200 | [diff] [blame^] | 456 | printf("Last Block Full:Allocate new block\n"); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 457 | |
Stefan Brüns | b96c3c7 | 2016-09-06 04:36:43 +0200 | [diff] [blame^] | 458 | if (le32_to_cpu(g_parent_inode->flags) & |
| 459 | EXT4_EXTENTS_FL) { |
| 460 | printf("Directory uses extents\n"); |
| 461 | goto fail; |
| 462 | } |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 463 | if (direct_blk_idx == INDIRECT_BLOCKS - 1) { |
| 464 | printf("Directory exceeds limit\n"); |
| 465 | goto fail; |
| 466 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 467 | new_blk_no = ext4fs_get_new_blk_no(); |
| 468 | if (new_blk_no == -1) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 469 | printf("no block left to assign\n"); |
| 470 | goto fail; |
| 471 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 472 | put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz); |
| 473 | g_parent_inode->b.blocks.dir_blocks[direct_blk_idx] = |
| 474 | cpu_to_le32(new_blk_no); |
| 475 | |
| 476 | new_size = le32_to_cpu(g_parent_inode->size); |
| 477 | new_size += fs->blksz; |
| 478 | g_parent_inode->size = cpu_to_le32(new_size); |
| 479 | |
| 480 | new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt); |
| 481 | new_blockcnt += fs->sect_perblk; |
| 482 | g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt); |
| 483 | |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 484 | if (ext4fs_put_metadata |
| 485 | (root_first_block_buffer, |
| 486 | first_block_no_of_root)) |
| 487 | goto fail; |
| 488 | goto restart; |
| 489 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 490 | dir->direntlen = cpu_to_le16(last_entry_dirlen); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 491 | break; |
| 492 | } |
| 493 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 494 | templength = le16_to_cpu(dir->direntlen); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 495 | totalbytes = totalbytes + templength; |
| 496 | sizeof_void_space = check_void_in_dentry(dir, filename); |
| 497 | if (sizeof_void_space) |
| 498 | break; |
| 499 | |
| 500 | dir = (struct ext2_dirent *)((char *)dir + templength); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | /* make a pointer ready for creating next directory entry */ |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 504 | templength = le16_to_cpu(dir->direntlen); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 505 | totalbytes = totalbytes + templength; |
| 506 | dir = (struct ext2_dirent *)((char *)dir + templength); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 507 | |
| 508 | /* get the next available inode number */ |
| 509 | inodeno = ext4fs_get_new_inode_no(); |
| 510 | if (inodeno == -1) { |
| 511 | printf("no inode left to assign\n"); |
| 512 | goto fail; |
| 513 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 514 | dir->inode = cpu_to_le32(inodeno); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 515 | if (sizeof_void_space) |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 516 | dir->direntlen = cpu_to_le16(sizeof_void_space); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 517 | else |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 518 | dir->direntlen = cpu_to_le16(fs->blksz - totalbytes); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 519 | |
| 520 | dir->namelen = strlen(filename); |
| 521 | dir->filetype = FILETYPE_REG; /* regular file */ |
| 522 | temp_dir = (char *)dir; |
| 523 | temp_dir = temp_dir + sizeof(struct ext2_dirent); |
| 524 | memcpy(temp_dir, filename, strlen(filename)); |
| 525 | |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 526 | /* update or write the 1st block of root inode */ |
| 527 | if (ext4fs_put_metadata(root_first_block_buffer, |
| 528 | first_block_no_of_root)) |
| 529 | goto fail; |
| 530 | |
| 531 | fail: |
| 532 | free(zero_buffer); |
| 533 | free(root_first_block_buffer); |
Stefan Brüns | a0d767e | 2016-09-06 04:36:42 +0200 | [diff] [blame] | 534 | |
| 535 | return inodeno; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 536 | } |
| 537 | |
| 538 | static int search_dir(struct ext2_inode *parent_inode, char *dirname) |
| 539 | { |
| 540 | int status; |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 541 | int inodeno = 0; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 542 | int totalbytes; |
| 543 | int templength; |
| 544 | int direct_blk_idx; |
| 545 | long int blknr; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 546 | char *ptr = NULL; |
| 547 | unsigned char *block_buffer = NULL; |
| 548 | struct ext2_dirent *dir = NULL; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 549 | struct ext_filesystem *fs = get_fs(); |
| 550 | |
| 551 | /* read the block no allocated to a file */ |
| 552 | for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; |
| 553 | direct_blk_idx++) { |
| 554 | blknr = read_allocated_block(parent_inode, direct_blk_idx); |
| 555 | if (blknr == 0) |
| 556 | goto fail; |
| 557 | |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 558 | /* read the blocks of parent inode */ |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 559 | block_buffer = zalloc(fs->blksz); |
| 560 | if (!block_buffer) |
| 561 | goto fail; |
| 562 | |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 563 | status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 564 | 0, fs->blksz, (char *)block_buffer); |
| 565 | if (status == 0) |
| 566 | goto fail; |
| 567 | |
| 568 | dir = (struct ext2_dirent *)block_buffer; |
| 569 | ptr = (char *)dir; |
| 570 | totalbytes = 0; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 571 | while (le16_to_cpu(dir->direntlen) >= 0) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 572 | /* |
| 573 | * blocksize-totalbytes because last directory |
| 574 | * length i.e.,*dir->direntlen is free availble |
| 575 | * space in the block that means |
| 576 | * it is a last entry of directory entry |
| 577 | */ |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 578 | if (dir->inode && (strlen(dirname) == dir->namelen)) { |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 579 | if (strncmp(dirname, ptr + sizeof(struct ext2_dirent), dir->namelen) == 0) { |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 580 | inodeno = le32_to_cpu(dir->inode); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 581 | break; |
| 582 | } |
| 583 | } |
| 584 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 585 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 586 | break; |
| 587 | |
| 588 | /* traversing the each directory entry */ |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 589 | templength = le16_to_cpu(dir->direntlen); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 590 | totalbytes = totalbytes + templength; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 591 | dir = (struct ext2_dirent *)((char *)dir + templength); |
| 592 | ptr = (char *)dir; |
| 593 | } |
| 594 | |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 595 | free(block_buffer); |
| 596 | block_buffer = NULL; |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 597 | |
| 598 | if (inodeno > 0) |
| 599 | return inodeno; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 600 | } |
| 601 | |
| 602 | fail: |
| 603 | free(block_buffer); |
| 604 | |
| 605 | return -1; |
| 606 | } |
| 607 | |
| 608 | static int find_dir_depth(char *dirname) |
| 609 | { |
| 610 | char *token = strtok(dirname, "/"); |
| 611 | int count = 0; |
| 612 | while (token != NULL) { |
| 613 | token = strtok(NULL, "/"); |
| 614 | count++; |
| 615 | } |
| 616 | return count + 1 + 1; |
| 617 | /* |
| 618 | * for example for string /home/temp |
| 619 | * depth=home(1)+temp(1)+1 extra for NULL; |
| 620 | * so count is 4; |
| 621 | */ |
| 622 | } |
| 623 | |
| 624 | static int parse_path(char **arr, char *dirname) |
| 625 | { |
| 626 | char *token = strtok(dirname, "/"); |
| 627 | int i = 0; |
| 628 | |
| 629 | /* add root */ |
| 630 | arr[i] = zalloc(strlen("/") + 1); |
| 631 | if (!arr[i]) |
| 632 | return -ENOMEM; |
Stephen Warren | 934b14f | 2015-09-04 22:03:44 -0600 | [diff] [blame] | 633 | memcpy(arr[i++], "/", strlen("/")); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 634 | |
| 635 | /* add each path entry after root */ |
| 636 | while (token != NULL) { |
| 637 | arr[i] = zalloc(strlen(token) + 1); |
| 638 | if (!arr[i]) |
| 639 | return -ENOMEM; |
| 640 | memcpy(arr[i++], token, strlen(token)); |
| 641 | token = strtok(NULL, "/"); |
| 642 | } |
| 643 | arr[i] = NULL; |
| 644 | |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | int ext4fs_iget(int inode_no, struct ext2_inode *inode) |
| 649 | { |
| 650 | if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) |
| 651 | return -1; |
| 652 | |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | /* |
| 657 | * Function: ext4fs_get_parent_inode_num |
| 658 | * Return Value: inode Number of the parent directory of file/Directory to be |
| 659 | * created |
| 660 | * dirname : Input parmater, input path name of the file/directory to be created |
| 661 | * dname : Output parameter, to be filled with the name of the directory |
| 662 | * extracted from dirname |
| 663 | */ |
| 664 | int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) |
| 665 | { |
| 666 | int i; |
| 667 | int depth = 0; |
| 668 | int matched_inode_no; |
| 669 | int result_inode_no = -1; |
| 670 | char **ptr = NULL; |
| 671 | char *depth_dirname = NULL; |
| 672 | char *parse_dirname = NULL; |
| 673 | struct ext2_inode *parent_inode = NULL; |
| 674 | struct ext2_inode *first_inode = NULL; |
| 675 | struct ext2_inode temp_inode; |
| 676 | |
| 677 | if (*dirname != '/') { |
| 678 | printf("Please supply Absolute path\n"); |
| 679 | return -1; |
| 680 | } |
| 681 | |
| 682 | /* TODO: input validation make equivalent to linux */ |
| 683 | depth_dirname = zalloc(strlen(dirname) + 1); |
| 684 | if (!depth_dirname) |
| 685 | return -ENOMEM; |
| 686 | |
| 687 | memcpy(depth_dirname, dirname, strlen(dirname)); |
| 688 | depth = find_dir_depth(depth_dirname); |
| 689 | parse_dirname = zalloc(strlen(dirname) + 1); |
| 690 | if (!parse_dirname) |
| 691 | goto fail; |
| 692 | memcpy(parse_dirname, dirname, strlen(dirname)); |
| 693 | |
| 694 | /* allocate memory for each directory level */ |
| 695 | ptr = zalloc((depth) * sizeof(char *)); |
| 696 | if (!ptr) |
| 697 | goto fail; |
| 698 | if (parse_path(ptr, parse_dirname)) |
| 699 | goto fail; |
| 700 | parent_inode = zalloc(sizeof(struct ext2_inode)); |
| 701 | if (!parent_inode) |
| 702 | goto fail; |
| 703 | first_inode = zalloc(sizeof(struct ext2_inode)); |
| 704 | if (!first_inode) |
| 705 | goto fail; |
| 706 | memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); |
| 707 | memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); |
| 708 | if (flags & F_FILE) |
| 709 | result_inode_no = EXT2_ROOT_INO; |
| 710 | for (i = 1; i < depth; i++) { |
| 711 | matched_inode_no = search_dir(parent_inode, ptr[i]); |
| 712 | if (matched_inode_no == -1) { |
| 713 | if (ptr[i + 1] == NULL && i == 1) { |
| 714 | result_inode_no = EXT2_ROOT_INO; |
| 715 | goto end; |
| 716 | } else { |
| 717 | if (ptr[i + 1] == NULL) |
| 718 | break; |
| 719 | printf("Invalid path\n"); |
| 720 | result_inode_no = -1; |
| 721 | goto fail; |
| 722 | } |
| 723 | } else { |
| 724 | if (ptr[i + 1] != NULL) { |
| 725 | memset(parent_inode, '\0', |
| 726 | sizeof(struct ext2_inode)); |
| 727 | if (ext4fs_iget(matched_inode_no, |
| 728 | parent_inode)) { |
| 729 | result_inode_no = -1; |
| 730 | goto fail; |
| 731 | } |
| 732 | result_inode_no = matched_inode_no; |
| 733 | } else { |
| 734 | break; |
| 735 | } |
| 736 | } |
| 737 | } |
| 738 | |
| 739 | end: |
| 740 | if (i == 1) |
| 741 | matched_inode_no = search_dir(first_inode, ptr[i]); |
| 742 | else |
| 743 | matched_inode_no = search_dir(parent_inode, ptr[i]); |
| 744 | |
| 745 | if (matched_inode_no != -1) { |
| 746 | ext4fs_iget(matched_inode_no, &temp_inode); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 747 | if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 748 | printf("It is a Directory\n"); |
| 749 | result_inode_no = -1; |
| 750 | goto fail; |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | if (strlen(ptr[i]) > 256) { |
| 755 | result_inode_no = -1; |
| 756 | goto fail; |
| 757 | } |
| 758 | memcpy(dname, ptr[i], strlen(ptr[i])); |
| 759 | |
| 760 | fail: |
| 761 | free(depth_dirname); |
| 762 | free(parse_dirname); |
Stephen Warren | 934b14f | 2015-09-04 22:03:44 -0600 | [diff] [blame] | 763 | for (i = 0; i < depth; i++) { |
| 764 | if (!ptr[i]) |
| 765 | break; |
| 766 | free(ptr[i]); |
| 767 | } |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 768 | free(ptr); |
| 769 | free(parent_inode); |
| 770 | free(first_inode); |
| 771 | |
| 772 | return result_inode_no; |
| 773 | } |
| 774 | |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 775 | static int unlink_filename(char *filename, unsigned int blknr) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 776 | { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 777 | int totalbytes = 0; |
| 778 | int templength = 0; |
| 779 | int status, inodeno; |
| 780 | int found = 0; |
| 781 | char *root_first_block_buffer = NULL; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 782 | struct ext2_dirent *dir = NULL; |
| 783 | struct ext2_dirent *previous_dir = NULL; |
| 784 | char *ptr = NULL; |
| 785 | struct ext_filesystem *fs = get_fs(); |
Stephen Warren | d56b201 | 2015-09-04 22:03:45 -0600 | [diff] [blame] | 786 | int ret = -1; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 787 | |
| 788 | /* get the first block of root */ |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 789 | root_first_block_buffer = zalloc(fs->blksz); |
| 790 | if (!root_first_block_buffer) |
| 791 | return -ENOMEM; |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 792 | status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 793 | fs->blksz, root_first_block_buffer); |
| 794 | if (status == 0) |
| 795 | goto fail; |
| 796 | |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 797 | if (ext4fs_log_journal(root_first_block_buffer, blknr)) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 798 | goto fail; |
| 799 | dir = (struct ext2_dirent *)root_first_block_buffer; |
| 800 | ptr = (char *)dir; |
| 801 | totalbytes = 0; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 802 | while (le16_to_cpu(dir->direntlen) >= 0) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 803 | /* |
| 804 | * blocksize-totalbytes because last |
| 805 | * directory length i.e., *dir->direntlen |
| 806 | * is free availble space in the block that |
| 807 | * means it is a last entry of directory entry |
| 808 | */ |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 809 | if (dir->inode && (strlen(filename) == dir->namelen) && |
| 810 | (strncmp(ptr + sizeof(struct ext2_dirent), |
| 811 | filename, dir->namelen) == 0)) { |
| 812 | printf("file found, deleting\n"); |
| 813 | inodeno = le32_to_cpu(dir->inode); |
| 814 | if (previous_dir) { |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 815 | uint16_t new_len; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 816 | new_len = le16_to_cpu(previous_dir->direntlen); |
| 817 | new_len += le16_to_cpu(dir->direntlen); |
| 818 | previous_dir->direntlen = cpu_to_le16(new_len); |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 819 | } else { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 820 | dir->inode = 0; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 821 | } |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 822 | found = 1; |
| 823 | break; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 824 | } |
| 825 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 826 | if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 827 | break; |
| 828 | |
| 829 | /* traversing the each directory entry */ |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 830 | templength = le16_to_cpu(dir->direntlen); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 831 | totalbytes = totalbytes + templength; |
| 832 | previous_dir = dir; |
| 833 | dir = (struct ext2_dirent *)((char *)dir + templength); |
| 834 | ptr = (char *)dir; |
| 835 | } |
| 836 | |
| 837 | |
| 838 | if (found == 1) { |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 839 | if (ext4fs_put_metadata(root_first_block_buffer, blknr)) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 840 | goto fail; |
Stephen Warren | d56b201 | 2015-09-04 22:03:45 -0600 | [diff] [blame] | 841 | ret = inodeno; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 842 | } |
| 843 | fail: |
| 844 | free(root_first_block_buffer); |
| 845 | |
Stephen Warren | d56b201 | 2015-09-04 22:03:45 -0600 | [diff] [blame] | 846 | return ret; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 847 | } |
| 848 | |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 849 | int ext4fs_filename_unlink(char *filename) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 850 | { |
| 851 | short direct_blk_idx = 0; |
| 852 | long int blknr = -1; |
| 853 | int inodeno = -1; |
| 854 | |
| 855 | /* read the block no allocated to a file */ |
| 856 | for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; |
| 857 | direct_blk_idx++) { |
| 858 | blknr = read_allocated_block(g_parent_inode, direct_blk_idx); |
| 859 | if (blknr == 0) |
| 860 | break; |
Stefan Brüns | 76a2951 | 2016-09-06 04:36:41 +0200 | [diff] [blame] | 861 | inodeno = unlink_filename(filename, blknr); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 862 | if (inodeno != -1) |
| 863 | return inodeno; |
| 864 | } |
| 865 | |
| 866 | return -1; |
| 867 | } |
| 868 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 869 | uint32_t ext4fs_get_new_blk_no(void) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 870 | { |
| 871 | short i; |
| 872 | short status; |
| 873 | int remainder; |
| 874 | unsigned int bg_idx; |
| 875 | static int prev_bg_bitmap_index = -1; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 876 | unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 877 | struct ext_filesystem *fs = get_fs(); |
| 878 | char *journal_buffer = zalloc(fs->blksz); |
| 879 | char *zero_buffer = zalloc(fs->blksz); |
| 880 | if (!journal_buffer || !zero_buffer) |
| 881 | goto fail; |
Simon Glass | 73c15c6 | 2012-10-03 11:37:49 +0000 | [diff] [blame] | 882 | struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 883 | |
| 884 | if (fs->first_pass_bbmap == 0) { |
| 885 | for (i = 0; i < fs->no_blkgrp; i++) { |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 886 | if (le16_to_cpu(bgd[i].free_blocks)) { |
| 887 | if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_BLOCK_UNINIT) { |
| 888 | uint16_t new_flags; |
| 889 | put_ext4((uint64_t)le32_to_cpu(bgd[i].block_id) * fs->blksz, |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 890 | zero_buffer, fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 891 | new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_BLOCK_UNINIT; |
| 892 | bgd[i].bg_flags = cpu_to_le16(new_flags); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 893 | memcpy(fs->blk_bmaps[i], zero_buffer, |
| 894 | fs->blksz); |
| 895 | } |
| 896 | fs->curr_blkno = |
| 897 | _get_new_blk_no(fs->blk_bmaps[i]); |
| 898 | if (fs->curr_blkno == -1) |
| 899 | /* if block bitmap is completely fill */ |
| 900 | continue; |
| 901 | fs->curr_blkno = fs->curr_blkno + |
| 902 | (i * fs->blksz * 8); |
| 903 | fs->first_pass_bbmap++; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 904 | ext4fs_bg_free_blocks_dec(&bgd[i]); |
| 905 | ext4fs_sb_free_blocks_dec(fs->sb); |
| 906 | status = ext4fs_devread( |
| 907 | (lbaint_t)le32_to_cpu(bgd[i].block_id) * |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 908 | fs->sect_perblk, 0, |
| 909 | fs->blksz, |
| 910 | journal_buffer); |
| 911 | if (status == 0) |
| 912 | goto fail; |
| 913 | if (ext4fs_log_journal(journal_buffer, |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 914 | le32_to_cpu(bgd[i].block_id))) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 915 | goto fail; |
| 916 | goto success; |
| 917 | } else { |
| 918 | debug("no space left on block group %d\n", i); |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | goto fail; |
| 923 | } else { |
| 924 | restart: |
| 925 | fs->curr_blkno++; |
| 926 | /* get the blockbitmap index respective to blockno */ |
Łukasz Majewski | 35dd055 | 2014-05-06 09:36:04 +0200 | [diff] [blame] | 927 | bg_idx = fs->curr_blkno / blk_per_grp; |
| 928 | if (fs->blksz == 1024) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 929 | remainder = fs->curr_blkno % blk_per_grp; |
| 930 | if (!remainder) |
| 931 | bg_idx--; |
| 932 | } |
| 933 | |
| 934 | /* |
| 935 | * To skip completely filled block group bitmaps |
| 936 | * Optimize the block allocation |
| 937 | */ |
| 938 | if (bg_idx >= fs->no_blkgrp) |
| 939 | goto fail; |
| 940 | |
Simon Glass | 73c15c6 | 2012-10-03 11:37:49 +0000 | [diff] [blame] | 941 | if (bgd[bg_idx].free_blocks == 0) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 942 | debug("block group %u is full. Skipping\n", bg_idx); |
| 943 | fs->curr_blkno = fs->curr_blkno + blk_per_grp; |
| 944 | fs->curr_blkno--; |
| 945 | goto restart; |
| 946 | } |
| 947 | |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 948 | if (le16_to_cpu(bgd[bg_idx].bg_flags) & EXT4_BG_BLOCK_UNINIT) { |
| 949 | uint16_t new_flags; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 950 | memset(zero_buffer, '\0', fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 951 | put_ext4((uint64_t)le32_to_cpu(bgd[bg_idx].block_id) * fs->blksz, |
| 952 | zero_buffer, fs->blksz); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 953 | memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 954 | new_flags = le16_to_cpu(bgd[bg_idx].bg_flags) & ~EXT4_BG_BLOCK_UNINIT; |
| 955 | bgd[bg_idx].bg_flags = cpu_to_le16(new_flags); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 956 | } |
| 957 | |
| 958 | if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], |
| 959 | bg_idx) != 0) { |
| 960 | debug("going for restart for the block no %ld %u\n", |
| 961 | fs->curr_blkno, bg_idx); |
| 962 | goto restart; |
| 963 | } |
| 964 | |
| 965 | /* journal backup */ |
| 966 | if (prev_bg_bitmap_index != bg_idx) { |
| 967 | memset(journal_buffer, '\0', fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 968 | status = ext4fs_devread( |
| 969 | (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 970 | * fs->sect_perblk, |
| 971 | 0, fs->blksz, journal_buffer); |
| 972 | if (status == 0) |
| 973 | goto fail; |
| 974 | if (ext4fs_log_journal(journal_buffer, |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 975 | le32_to_cpu(bgd[bg_idx].block_id))) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 976 | goto fail; |
| 977 | |
| 978 | prev_bg_bitmap_index = bg_idx; |
| 979 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 980 | ext4fs_bg_free_blocks_dec(&bgd[bg_idx]); |
| 981 | ext4fs_sb_free_blocks_dec(fs->sb); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 982 | goto success; |
| 983 | } |
| 984 | success: |
| 985 | free(journal_buffer); |
| 986 | free(zero_buffer); |
| 987 | |
| 988 | return fs->curr_blkno; |
| 989 | fail: |
| 990 | free(journal_buffer); |
| 991 | free(zero_buffer); |
| 992 | |
| 993 | return -1; |
| 994 | } |
| 995 | |
| 996 | int ext4fs_get_new_inode_no(void) |
| 997 | { |
| 998 | short i; |
| 999 | short status; |
| 1000 | unsigned int ibmap_idx; |
| 1001 | static int prev_inode_bitmap_index = -1; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1002 | unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1003 | struct ext_filesystem *fs = get_fs(); |
| 1004 | char *journal_buffer = zalloc(fs->blksz); |
| 1005 | char *zero_buffer = zalloc(fs->blksz); |
| 1006 | if (!journal_buffer || !zero_buffer) |
| 1007 | goto fail; |
Simon Glass | 73c15c6 | 2012-10-03 11:37:49 +0000 | [diff] [blame] | 1008 | struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1009 | |
| 1010 | if (fs->first_pass_ibmap == 0) { |
| 1011 | for (i = 0; i < fs->no_blkgrp; i++) { |
Simon Glass | 73c15c6 | 2012-10-03 11:37:49 +0000 | [diff] [blame] | 1012 | if (bgd[i].free_inodes) { |
| 1013 | if (bgd[i].bg_itable_unused != |
| 1014 | bgd[i].free_inodes) |
| 1015 | bgd[i].bg_itable_unused = |
| 1016 | bgd[i].free_inodes; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1017 | if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_INODE_UNINIT) { |
| 1018 | int new_flags; |
| 1019 | put_ext4((uint64_t)le32_to_cpu(bgd[i].inode_id) * fs->blksz, |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1020 | zero_buffer, fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1021 | new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_INODE_UNINIT; |
| 1022 | bgd[i].bg_flags = cpu_to_le16(new_flags); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1023 | memcpy(fs->inode_bmaps[i], |
| 1024 | zero_buffer, fs->blksz); |
| 1025 | } |
| 1026 | fs->curr_inode_no = |
| 1027 | _get_new_inode_no(fs->inode_bmaps[i]); |
| 1028 | if (fs->curr_inode_no == -1) |
| 1029 | /* if block bitmap is completely fill */ |
| 1030 | continue; |
| 1031 | fs->curr_inode_no = fs->curr_inode_no + |
| 1032 | (i * inodes_per_grp); |
| 1033 | fs->first_pass_ibmap++; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1034 | ext4fs_bg_free_inodes_dec(&bgd[i]); |
| 1035 | ext4fs_bg_itable_unused_dec(&bgd[i]); |
| 1036 | ext4fs_sb_free_inodes_dec(fs->sb); |
| 1037 | status = ext4fs_devread( |
| 1038 | (lbaint_t)le32_to_cpu(bgd[i].inode_id) * |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1039 | fs->sect_perblk, 0, |
| 1040 | fs->blksz, |
| 1041 | journal_buffer); |
| 1042 | if (status == 0) |
| 1043 | goto fail; |
| 1044 | if (ext4fs_log_journal(journal_buffer, |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1045 | le32_to_cpu(bgd[i].inode_id))) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1046 | goto fail; |
| 1047 | goto success; |
| 1048 | } else |
| 1049 | debug("no inode left on block group %d\n", i); |
| 1050 | } |
| 1051 | goto fail; |
| 1052 | } else { |
| 1053 | restart: |
| 1054 | fs->curr_inode_no++; |
| 1055 | /* get the blockbitmap index respective to blockno */ |
| 1056 | ibmap_idx = fs->curr_inode_no / inodes_per_grp; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1057 | if (le16_to_cpu(bgd[ibmap_idx].bg_flags) & EXT4_BG_INODE_UNINIT) { |
| 1058 | int new_flags; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1059 | memset(zero_buffer, '\0', fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1060 | put_ext4((uint64_t)le32_to_cpu(bgd[ibmap_idx].inode_id) * fs->blksz, |
| 1061 | zero_buffer, fs->blksz); |
| 1062 | new_flags = le16_to_cpu(bgd[ibmap_idx].bg_flags) & ~EXT4_BG_INODE_UNINIT; |
| 1063 | bgd[ibmap_idx].bg_flags = cpu_to_le16(new_flags); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1064 | memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, |
| 1065 | fs->blksz); |
| 1066 | } |
| 1067 | |
| 1068 | if (ext4fs_set_inode_bmap(fs->curr_inode_no, |
| 1069 | fs->inode_bmaps[ibmap_idx], |
| 1070 | ibmap_idx) != 0) { |
| 1071 | debug("going for restart for the block no %d %u\n", |
| 1072 | fs->curr_inode_no, ibmap_idx); |
| 1073 | goto restart; |
| 1074 | } |
| 1075 | |
| 1076 | /* journal backup */ |
| 1077 | if (prev_inode_bitmap_index != ibmap_idx) { |
| 1078 | memset(journal_buffer, '\0', fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1079 | status = ext4fs_devread( |
| 1080 | (lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1081 | * fs->sect_perblk, |
| 1082 | 0, fs->blksz, journal_buffer); |
| 1083 | if (status == 0) |
| 1084 | goto fail; |
| 1085 | if (ext4fs_log_journal(journal_buffer, |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1086 | le32_to_cpu(bgd[ibmap_idx].inode_id))) |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1087 | goto fail; |
| 1088 | prev_inode_bitmap_index = ibmap_idx; |
| 1089 | } |
Simon Glass | 73c15c6 | 2012-10-03 11:37:49 +0000 | [diff] [blame] | 1090 | if (bgd[ibmap_idx].bg_itable_unused != |
| 1091 | bgd[ibmap_idx].free_inodes) |
| 1092 | bgd[ibmap_idx].bg_itable_unused = |
| 1093 | bgd[ibmap_idx].free_inodes; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1094 | ext4fs_bg_free_inodes_dec(&bgd[ibmap_idx]); |
| 1095 | ext4fs_bg_itable_unused_dec(&bgd[ibmap_idx]); |
| 1096 | ext4fs_sb_free_inodes_dec(fs->sb); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1097 | goto success; |
| 1098 | } |
| 1099 | |
| 1100 | success: |
| 1101 | free(journal_buffer); |
| 1102 | free(zero_buffer); |
| 1103 | |
| 1104 | return fs->curr_inode_no; |
| 1105 | fail: |
| 1106 | free(journal_buffer); |
| 1107 | free(zero_buffer); |
| 1108 | |
| 1109 | return -1; |
| 1110 | |
| 1111 | } |
| 1112 | |
| 1113 | |
| 1114 | static void alloc_single_indirect_block(struct ext2_inode *file_inode, |
| 1115 | unsigned int *total_remaining_blocks, |
| 1116 | unsigned int *no_blks_reqd) |
| 1117 | { |
| 1118 | short i; |
| 1119 | short status; |
| 1120 | long int actual_block_no; |
| 1121 | long int si_blockno; |
| 1122 | /* si :single indirect */ |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1123 | __le32 *si_buffer = NULL; |
| 1124 | __le32 *si_start_addr = NULL; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1125 | struct ext_filesystem *fs = get_fs(); |
| 1126 | |
| 1127 | if (*total_remaining_blocks != 0) { |
| 1128 | si_buffer = zalloc(fs->blksz); |
| 1129 | if (!si_buffer) { |
| 1130 | printf("No Memory\n"); |
| 1131 | return; |
| 1132 | } |
| 1133 | si_start_addr = si_buffer; |
| 1134 | si_blockno = ext4fs_get_new_blk_no(); |
| 1135 | if (si_blockno == -1) { |
| 1136 | printf("no block left to assign\n"); |
| 1137 | goto fail; |
| 1138 | } |
| 1139 | (*no_blks_reqd)++; |
| 1140 | debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); |
| 1141 | |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 1142 | status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1143 | 0, fs->blksz, (char *)si_buffer); |
| 1144 | memset(si_buffer, '\0', fs->blksz); |
| 1145 | if (status == 0) |
| 1146 | goto fail; |
| 1147 | |
| 1148 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { |
| 1149 | actual_block_no = ext4fs_get_new_blk_no(); |
| 1150 | if (actual_block_no == -1) { |
| 1151 | printf("no block left to assign\n"); |
| 1152 | goto fail; |
| 1153 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1154 | *si_buffer = cpu_to_le32(actual_block_no); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1155 | debug("SIAB %u: %u\n", *si_buffer, |
| 1156 | *total_remaining_blocks); |
| 1157 | |
| 1158 | si_buffer++; |
| 1159 | (*total_remaining_blocks)--; |
| 1160 | if (*total_remaining_blocks == 0) |
| 1161 | break; |
| 1162 | } |
| 1163 | |
| 1164 | /* write the block to disk */ |
Ma Haijun | 0550870 | 2014-01-08 08:15:33 +0800 | [diff] [blame] | 1165 | put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1166 | si_start_addr, fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1167 | file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1168 | } |
| 1169 | fail: |
| 1170 | free(si_start_addr); |
| 1171 | } |
| 1172 | |
| 1173 | static void alloc_double_indirect_block(struct ext2_inode *file_inode, |
| 1174 | unsigned int *total_remaining_blocks, |
| 1175 | unsigned int *no_blks_reqd) |
| 1176 | { |
| 1177 | short i; |
| 1178 | short j; |
| 1179 | short status; |
| 1180 | long int actual_block_no; |
| 1181 | /* di:double indirect */ |
| 1182 | long int di_blockno_parent; |
| 1183 | long int di_blockno_child; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1184 | __le32 *di_parent_buffer = NULL; |
| 1185 | __le32 *di_child_buff = NULL; |
| 1186 | __le32 *di_block_start_addr = NULL; |
| 1187 | __le32 *di_child_buff_start = NULL; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1188 | struct ext_filesystem *fs = get_fs(); |
| 1189 | |
| 1190 | if (*total_remaining_blocks != 0) { |
| 1191 | /* double indirect parent block connecting to inode */ |
| 1192 | di_blockno_parent = ext4fs_get_new_blk_no(); |
| 1193 | if (di_blockno_parent == -1) { |
| 1194 | printf("no block left to assign\n"); |
| 1195 | goto fail; |
| 1196 | } |
| 1197 | di_parent_buffer = zalloc(fs->blksz); |
| 1198 | if (!di_parent_buffer) |
| 1199 | goto fail; |
| 1200 | |
| 1201 | di_block_start_addr = di_parent_buffer; |
| 1202 | (*no_blks_reqd)++; |
| 1203 | debug("DIPB %ld: %u\n", di_blockno_parent, |
| 1204 | *total_remaining_blocks); |
| 1205 | |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 1206 | status = ext4fs_devread((lbaint_t)di_blockno_parent * |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1207 | fs->sect_perblk, 0, |
| 1208 | fs->blksz, (char *)di_parent_buffer); |
Łukasz Majewski | d429ca0 | 2012-12-05 08:06:39 +0000 | [diff] [blame] | 1209 | |
| 1210 | if (!status) { |
| 1211 | printf("%s: Device read error!\n", __func__); |
| 1212 | goto fail; |
| 1213 | } |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1214 | memset(di_parent_buffer, '\0', fs->blksz); |
| 1215 | |
| 1216 | /* |
| 1217 | * start:for each double indirect parent |
| 1218 | * block create one more block |
| 1219 | */ |
| 1220 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { |
| 1221 | di_blockno_child = ext4fs_get_new_blk_no(); |
| 1222 | if (di_blockno_child == -1) { |
| 1223 | printf("no block left to assign\n"); |
| 1224 | goto fail; |
| 1225 | } |
| 1226 | di_child_buff = zalloc(fs->blksz); |
| 1227 | if (!di_child_buff) |
| 1228 | goto fail; |
| 1229 | |
| 1230 | di_child_buff_start = di_child_buff; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1231 | *di_parent_buffer = cpu_to_le32(di_blockno_child); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1232 | di_parent_buffer++; |
| 1233 | (*no_blks_reqd)++; |
| 1234 | debug("DICB %ld: %u\n", di_blockno_child, |
| 1235 | *total_remaining_blocks); |
| 1236 | |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 1237 | status = ext4fs_devread((lbaint_t)di_blockno_child * |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1238 | fs->sect_perblk, 0, |
| 1239 | fs->blksz, |
| 1240 | (char *)di_child_buff); |
Łukasz Majewski | d429ca0 | 2012-12-05 08:06:39 +0000 | [diff] [blame] | 1241 | |
| 1242 | if (!status) { |
| 1243 | printf("%s: Device read error!\n", __func__); |
| 1244 | goto fail; |
| 1245 | } |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1246 | memset(di_child_buff, '\0', fs->blksz); |
| 1247 | /* filling of actual datablocks for each child */ |
| 1248 | for (j = 0; j < (fs->blksz / sizeof(int)); j++) { |
| 1249 | actual_block_no = ext4fs_get_new_blk_no(); |
| 1250 | if (actual_block_no == -1) { |
| 1251 | printf("no block left to assign\n"); |
| 1252 | goto fail; |
| 1253 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1254 | *di_child_buff = cpu_to_le32(actual_block_no); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1255 | debug("DIAB %ld: %u\n", actual_block_no, |
| 1256 | *total_remaining_blocks); |
| 1257 | |
| 1258 | di_child_buff++; |
| 1259 | (*total_remaining_blocks)--; |
| 1260 | if (*total_remaining_blocks == 0) |
| 1261 | break; |
| 1262 | } |
| 1263 | /* write the block table */ |
Ma Haijun | 0550870 | 2014-01-08 08:15:33 +0800 | [diff] [blame] | 1264 | put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1265 | di_child_buff_start, fs->blksz); |
| 1266 | free(di_child_buff_start); |
| 1267 | di_child_buff_start = NULL; |
| 1268 | |
| 1269 | if (*total_remaining_blocks == 0) |
| 1270 | break; |
| 1271 | } |
Ma Haijun | 0550870 | 2014-01-08 08:15:33 +0800 | [diff] [blame] | 1272 | put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1273 | di_block_start_addr, fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1274 | file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1275 | } |
| 1276 | fail: |
| 1277 | free(di_block_start_addr); |
| 1278 | } |
| 1279 | |
| 1280 | static void alloc_triple_indirect_block(struct ext2_inode *file_inode, |
| 1281 | unsigned int *total_remaining_blocks, |
| 1282 | unsigned int *no_blks_reqd) |
| 1283 | { |
| 1284 | short i; |
| 1285 | short j; |
| 1286 | short k; |
| 1287 | long int actual_block_no; |
| 1288 | /* ti: Triple Indirect */ |
| 1289 | long int ti_gp_blockno; |
| 1290 | long int ti_parent_blockno; |
| 1291 | long int ti_child_blockno; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1292 | __le32 *ti_gp_buff = NULL; |
| 1293 | __le32 *ti_parent_buff = NULL; |
| 1294 | __le32 *ti_child_buff = NULL; |
| 1295 | __le32 *ti_gp_buff_start_addr = NULL; |
| 1296 | __le32 *ti_pbuff_start_addr = NULL; |
| 1297 | __le32 *ti_cbuff_start_addr = NULL; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1298 | struct ext_filesystem *fs = get_fs(); |
| 1299 | if (*total_remaining_blocks != 0) { |
| 1300 | /* triple indirect grand parent block connecting to inode */ |
| 1301 | ti_gp_blockno = ext4fs_get_new_blk_no(); |
| 1302 | if (ti_gp_blockno == -1) { |
| 1303 | printf("no block left to assign\n"); |
Tom Rini | 495c3a1 | 2015-12-10 16:42:21 -0500 | [diff] [blame] | 1304 | return; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1305 | } |
| 1306 | ti_gp_buff = zalloc(fs->blksz); |
| 1307 | if (!ti_gp_buff) |
Tom Rini | 495c3a1 | 2015-12-10 16:42:21 -0500 | [diff] [blame] | 1308 | return; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1309 | |
| 1310 | ti_gp_buff_start_addr = ti_gp_buff; |
| 1311 | (*no_blks_reqd)++; |
| 1312 | debug("TIGPB %ld: %u\n", ti_gp_blockno, |
| 1313 | *total_remaining_blocks); |
| 1314 | |
| 1315 | /* for each 4 byte grand parent entry create one more block */ |
| 1316 | for (i = 0; i < (fs->blksz / sizeof(int)); i++) { |
| 1317 | ti_parent_blockno = ext4fs_get_new_blk_no(); |
| 1318 | if (ti_parent_blockno == -1) { |
| 1319 | printf("no block left to assign\n"); |
| 1320 | goto fail; |
| 1321 | } |
| 1322 | ti_parent_buff = zalloc(fs->blksz); |
| 1323 | if (!ti_parent_buff) |
| 1324 | goto fail; |
| 1325 | |
| 1326 | ti_pbuff_start_addr = ti_parent_buff; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1327 | *ti_gp_buff = cpu_to_le32(ti_parent_blockno); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1328 | ti_gp_buff++; |
| 1329 | (*no_blks_reqd)++; |
| 1330 | debug("TIPB %ld: %u\n", ti_parent_blockno, |
| 1331 | *total_remaining_blocks); |
| 1332 | |
| 1333 | /* for each 4 byte entry parent create one more block */ |
| 1334 | for (j = 0; j < (fs->blksz / sizeof(int)); j++) { |
| 1335 | ti_child_blockno = ext4fs_get_new_blk_no(); |
| 1336 | if (ti_child_blockno == -1) { |
| 1337 | printf("no block left assign\n"); |
Tom Rini | 495c3a1 | 2015-12-10 16:42:21 -0500 | [diff] [blame] | 1338 | goto fail1; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1339 | } |
| 1340 | ti_child_buff = zalloc(fs->blksz); |
| 1341 | if (!ti_child_buff) |
Tom Rini | 495c3a1 | 2015-12-10 16:42:21 -0500 | [diff] [blame] | 1342 | goto fail1; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1343 | |
| 1344 | ti_cbuff_start_addr = ti_child_buff; |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1345 | *ti_parent_buff = cpu_to_le32(ti_child_blockno); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1346 | ti_parent_buff++; |
| 1347 | (*no_blks_reqd)++; |
| 1348 | debug("TICB %ld: %u\n", ti_parent_blockno, |
| 1349 | *total_remaining_blocks); |
| 1350 | |
| 1351 | /* fill actual datablocks for each child */ |
| 1352 | for (k = 0; k < (fs->blksz / sizeof(int)); |
| 1353 | k++) { |
| 1354 | actual_block_no = |
| 1355 | ext4fs_get_new_blk_no(); |
| 1356 | if (actual_block_no == -1) { |
| 1357 | printf("no block left\n"); |
Tom Rini | 495c3a1 | 2015-12-10 16:42:21 -0500 | [diff] [blame] | 1358 | free(ti_cbuff_start_addr); |
| 1359 | goto fail1; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1360 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1361 | *ti_child_buff = cpu_to_le32(actual_block_no); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1362 | debug("TIAB %ld: %u\n", actual_block_no, |
| 1363 | *total_remaining_blocks); |
| 1364 | |
| 1365 | ti_child_buff++; |
| 1366 | (*total_remaining_blocks)--; |
| 1367 | if (*total_remaining_blocks == 0) |
| 1368 | break; |
| 1369 | } |
| 1370 | /* write the child block */ |
Ma Haijun | 0550870 | 2014-01-08 08:15:33 +0800 | [diff] [blame] | 1371 | put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * |
| 1372 | (uint64_t)fs->blksz)), |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1373 | ti_cbuff_start_addr, fs->blksz); |
| 1374 | free(ti_cbuff_start_addr); |
| 1375 | |
| 1376 | if (*total_remaining_blocks == 0) |
| 1377 | break; |
| 1378 | } |
| 1379 | /* write the parent block */ |
Ma Haijun | 0550870 | 2014-01-08 08:15:33 +0800 | [diff] [blame] | 1380 | put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1381 | ti_pbuff_start_addr, fs->blksz); |
| 1382 | free(ti_pbuff_start_addr); |
| 1383 | |
| 1384 | if (*total_remaining_blocks == 0) |
| 1385 | break; |
| 1386 | } |
| 1387 | /* write the grand parent block */ |
Ma Haijun | 0550870 | 2014-01-08 08:15:33 +0800 | [diff] [blame] | 1388 | put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1389 | ti_gp_buff_start_addr, fs->blksz); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1390 | file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); |
Tom Rini | 495c3a1 | 2015-12-10 16:42:21 -0500 | [diff] [blame] | 1391 | free(ti_gp_buff_start_addr); |
| 1392 | return; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1393 | } |
Tom Rini | 495c3a1 | 2015-12-10 16:42:21 -0500 | [diff] [blame] | 1394 | fail1: |
| 1395 | free(ti_pbuff_start_addr); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1396 | fail: |
| 1397 | free(ti_gp_buff_start_addr); |
| 1398 | } |
| 1399 | |
| 1400 | void ext4fs_allocate_blocks(struct ext2_inode *file_inode, |
| 1401 | unsigned int total_remaining_blocks, |
| 1402 | unsigned int *total_no_of_block) |
| 1403 | { |
| 1404 | short i; |
| 1405 | long int direct_blockno; |
| 1406 | unsigned int no_blks_reqd = 0; |
| 1407 | |
| 1408 | /* allocation of direct blocks */ |
Stephen Warren | d018028 | 2014-06-11 12:46:16 -0600 | [diff] [blame] | 1409 | for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1410 | direct_blockno = ext4fs_get_new_blk_no(); |
| 1411 | if (direct_blockno == -1) { |
| 1412 | printf("no block left to assign\n"); |
| 1413 | return; |
| 1414 | } |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1415 | file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1416 | debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); |
| 1417 | |
| 1418 | total_remaining_blocks--; |
Uma Shankar | ed34f34 | 2012-05-25 21:22:49 +0530 | [diff] [blame] | 1419 | } |
| 1420 | |
| 1421 | alloc_single_indirect_block(file_inode, &total_remaining_blocks, |
| 1422 | &no_blks_reqd); |
| 1423 | alloc_double_indirect_block(file_inode, &total_remaining_blocks, |
| 1424 | &no_blks_reqd); |
| 1425 | alloc_triple_indirect_block(file_inode, &total_remaining_blocks, |
| 1426 | &no_blks_reqd); |
| 1427 | *total_no_of_block += no_blks_reqd; |
| 1428 | } |
| 1429 | |
| 1430 | #endif |
| 1431 | |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1432 | static struct ext4_extent_header *ext4fs_get_extent_block |
| 1433 | (struct ext2_data *data, char *buf, |
| 1434 | struct ext4_extent_header *ext_block, |
| 1435 | uint32_t fileblock, int log2_blksz) |
| 1436 | { |
| 1437 | struct ext4_extent_idx *index; |
| 1438 | unsigned long long block; |
Ionut Nicu | 4701732 | 2014-01-13 11:59:24 +0100 | [diff] [blame] | 1439 | int blksz = EXT2_BLOCK_SIZE(data); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1440 | int i; |
| 1441 | |
| 1442 | while (1) { |
| 1443 | index = (struct ext4_extent_idx *)(ext_block + 1); |
| 1444 | |
Rommel Custodio | 8b415f7 | 2013-07-21 10:53:25 +0200 | [diff] [blame] | 1445 | if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1446 | return NULL; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1447 | |
| 1448 | if (ext_block->eh_depth == 0) |
| 1449 | return ext_block; |
| 1450 | i = -1; |
| 1451 | do { |
| 1452 | i++; |
Rommel Custodio | 8b415f7 | 2013-07-21 10:53:25 +0200 | [diff] [blame] | 1453 | if (i >= le16_to_cpu(ext_block->eh_entries)) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1454 | break; |
Ionut Nicu | b5bbac1 | 2014-01-13 12:00:08 +0100 | [diff] [blame] | 1455 | } while (fileblock >= le32_to_cpu(index[i].ei_block)); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1456 | |
| 1457 | if (--i < 0) |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1458 | return NULL; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1459 | |
Rommel Custodio | 8b415f7 | 2013-07-21 10:53:25 +0200 | [diff] [blame] | 1460 | block = le16_to_cpu(index[i].ei_leaf_hi); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1461 | block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); |
| 1462 | |
Ionut Nicu | 4701732 | 2014-01-13 11:59:24 +0100 | [diff] [blame] | 1463 | if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 1464 | buf)) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1465 | ext_block = (struct ext4_extent_header *)buf; |
| 1466 | else |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 1467 | return NULL; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1468 | } |
| 1469 | } |
| 1470 | |
| 1471 | static int ext4fs_blockgroup |
| 1472 | (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) |
| 1473 | { |
| 1474 | long int blkno; |
| 1475 | unsigned int blkoff, desc_per_blk; |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 1476 | int log2blksz = get_fs()->dev_desc->log2blksz; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1477 | |
| 1478 | desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group); |
| 1479 | |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1480 | blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1481 | group / desc_per_blk; |
| 1482 | blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group); |
| 1483 | |
| 1484 | debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", |
| 1485 | group, blkno, blkoff); |
| 1486 | |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 1487 | return ext4fs_devread((lbaint_t)blkno << |
| 1488 | (LOG2_BLOCK_SIZE(data) - log2blksz), |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1489 | blkoff, sizeof(struct ext2_block_group), |
| 1490 | (char *)blkgrp); |
| 1491 | } |
| 1492 | |
| 1493 | int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) |
| 1494 | { |
| 1495 | struct ext2_block_group blkgrp; |
| 1496 | struct ext2_sblock *sblock = &data->sblock; |
| 1497 | struct ext_filesystem *fs = get_fs(); |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 1498 | int log2blksz = get_fs()->dev_desc->log2blksz; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1499 | int inodes_per_block, status; |
| 1500 | long int blkno; |
| 1501 | unsigned int blkoff; |
| 1502 | |
| 1503 | /* It is easier to calculate if the first inode is 0. */ |
| 1504 | ino--; |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1505 | status = ext4fs_blockgroup(data, ino / le32_to_cpu |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1506 | (sblock->inodes_per_group), &blkgrp); |
| 1507 | if (status == 0) |
| 1508 | return 0; |
| 1509 | |
| 1510 | inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1511 | blkno = le32_to_cpu(blkgrp.inode_table_id) + |
| 1512 | (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1513 | blkoff = (ino % inodes_per_block) * fs->inodesz; |
| 1514 | /* Read the inode. */ |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 1515 | status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - |
| 1516 | log2blksz), blkoff, |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1517 | sizeof(struct ext2_inode), (char *)inode); |
| 1518 | if (status == 0) |
| 1519 | return 0; |
| 1520 | |
| 1521 | return 1; |
| 1522 | } |
| 1523 | |
| 1524 | long int read_allocated_block(struct ext2_inode *inode, int fileblock) |
| 1525 | { |
| 1526 | long int blknr; |
| 1527 | int blksz; |
| 1528 | int log2_blksz; |
| 1529 | int status; |
| 1530 | long int rblock; |
| 1531 | long int perblock_parent; |
| 1532 | long int perblock_child; |
| 1533 | unsigned long long start; |
| 1534 | /* get the blocksize of the filesystem */ |
| 1535 | blksz = EXT2_BLOCK_SIZE(ext4fs_root); |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 1536 | log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) |
| 1537 | - get_fs()->dev_desc->log2blksz; |
| 1538 | |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1539 | if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { |
| 1540 | char *buf = zalloc(blksz); |
| 1541 | if (!buf) |
| 1542 | return -ENOMEM; |
| 1543 | struct ext4_extent_header *ext_block; |
| 1544 | struct ext4_extent *extent; |
| 1545 | int i = -1; |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 1546 | ext_block = |
| 1547 | ext4fs_get_extent_block(ext4fs_root, buf, |
| 1548 | (struct ext4_extent_header *) |
| 1549 | inode->b.blocks.dir_blocks, |
| 1550 | fileblock, log2_blksz); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1551 | if (!ext_block) { |
| 1552 | printf("invalid extent block\n"); |
| 1553 | free(buf); |
| 1554 | return -EINVAL; |
| 1555 | } |
| 1556 | |
| 1557 | extent = (struct ext4_extent *)(ext_block + 1); |
| 1558 | |
| 1559 | do { |
| 1560 | i++; |
Rommel Custodio | 8b415f7 | 2013-07-21 10:53:25 +0200 | [diff] [blame] | 1561 | if (i >= le16_to_cpu(ext_block->eh_entries)) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1562 | break; |
| 1563 | } while (fileblock >= le32_to_cpu(extent[i].ee_block)); |
| 1564 | if (--i >= 0) { |
| 1565 | fileblock -= le32_to_cpu(extent[i].ee_block); |
Rommel Custodio | 8b415f7 | 2013-07-21 10:53:25 +0200 | [diff] [blame] | 1566 | if (fileblock >= le16_to_cpu(extent[i].ee_len)) { |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1567 | free(buf); |
| 1568 | return 0; |
| 1569 | } |
| 1570 | |
Rommel Custodio | 8b415f7 | 2013-07-21 10:53:25 +0200 | [diff] [blame] | 1571 | start = le16_to_cpu(extent[i].ee_start_hi); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1572 | start = (start << 32) + |
| 1573 | le32_to_cpu(extent[i].ee_start_lo); |
| 1574 | free(buf); |
| 1575 | return fileblock + start; |
| 1576 | } |
| 1577 | |
| 1578 | printf("Extent Error\n"); |
| 1579 | free(buf); |
| 1580 | return -1; |
| 1581 | } |
| 1582 | |
| 1583 | /* Direct blocks. */ |
| 1584 | if (fileblock < INDIRECT_BLOCKS) |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1585 | blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1586 | |
| 1587 | /* Indirect. */ |
| 1588 | else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { |
| 1589 | if (ext4fs_indir1_block == NULL) { |
| 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 | ext4fs_indir1_blkno = -1; |
| 1598 | } |
| 1599 | if (blksz != ext4fs_indir1_size) { |
| 1600 | free(ext4fs_indir1_block); |
| 1601 | ext4fs_indir1_block = NULL; |
| 1602 | ext4fs_indir1_size = 0; |
| 1603 | ext4fs_indir1_blkno = -1; |
| 1604 | ext4fs_indir1_block = zalloc(blksz); |
| 1605 | if (ext4fs_indir1_block == NULL) { |
| 1606 | printf("** SI ext2fs read block (indir 1):" |
| 1607 | "malloc failed. **\n"); |
| 1608 | return -1; |
| 1609 | } |
| 1610 | ext4fs_indir1_size = blksz; |
| 1611 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1612 | if ((le32_to_cpu(inode->b.blocks.indir_block) << |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1613 | log2_blksz) != ext4fs_indir1_blkno) { |
| 1614 | status = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1615 | ext4fs_devread((lbaint_t)le32_to_cpu |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1616 | (inode->b.blocks. |
| 1617 | indir_block) << log2_blksz, 0, |
| 1618 | blksz, (char *)ext4fs_indir1_block); |
| 1619 | if (status == 0) { |
| 1620 | printf("** SI ext2fs read block (indir 1)" |
| 1621 | "failed. **\n"); |
| 1622 | return 0; |
| 1623 | } |
| 1624 | ext4fs_indir1_blkno = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1625 | le32_to_cpu(inode->b.blocks. |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1626 | indir_block) << log2_blksz; |
| 1627 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1628 | blknr = le32_to_cpu(ext4fs_indir1_block |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1629 | [fileblock - INDIRECT_BLOCKS]); |
| 1630 | } |
| 1631 | /* Double indirect. */ |
| 1632 | else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * |
| 1633 | (blksz / 4 + 1)))) { |
| 1634 | |
| 1635 | long int perblock = blksz / 4; |
| 1636 | long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); |
| 1637 | |
| 1638 | if (ext4fs_indir1_block == NULL) { |
| 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 | ext4fs_indir1_blkno = -1; |
| 1647 | } |
| 1648 | if (blksz != ext4fs_indir1_size) { |
| 1649 | free(ext4fs_indir1_block); |
| 1650 | ext4fs_indir1_block = NULL; |
| 1651 | ext4fs_indir1_size = 0; |
| 1652 | ext4fs_indir1_blkno = -1; |
| 1653 | ext4fs_indir1_block = zalloc(blksz); |
| 1654 | if (ext4fs_indir1_block == NULL) { |
| 1655 | printf("** DI ext2fs read block (indir 2 1)" |
| 1656 | "malloc failed. **\n"); |
| 1657 | return -1; |
| 1658 | } |
| 1659 | ext4fs_indir1_size = blksz; |
| 1660 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1661 | if ((le32_to_cpu(inode->b.blocks.double_indir_block) << |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1662 | log2_blksz) != ext4fs_indir1_blkno) { |
| 1663 | status = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1664 | ext4fs_devread((lbaint_t)le32_to_cpu |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1665 | (inode->b.blocks. |
| 1666 | double_indir_block) << log2_blksz, |
| 1667 | 0, blksz, |
| 1668 | (char *)ext4fs_indir1_block); |
| 1669 | if (status == 0) { |
| 1670 | printf("** DI ext2fs read block (indir 2 1)" |
| 1671 | "failed. **\n"); |
| 1672 | return -1; |
| 1673 | } |
| 1674 | ext4fs_indir1_blkno = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1675 | le32_to_cpu(inode->b.blocks.double_indir_block) << |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1676 | log2_blksz; |
| 1677 | } |
| 1678 | |
| 1679 | if (ext4fs_indir2_block == NULL) { |
| 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 | ext4fs_indir2_blkno = -1; |
| 1688 | } |
| 1689 | if (blksz != ext4fs_indir2_size) { |
| 1690 | free(ext4fs_indir2_block); |
| 1691 | ext4fs_indir2_block = NULL; |
| 1692 | ext4fs_indir2_size = 0; |
| 1693 | ext4fs_indir2_blkno = -1; |
| 1694 | ext4fs_indir2_block = zalloc(blksz); |
| 1695 | if (ext4fs_indir2_block == NULL) { |
| 1696 | printf("** DI ext2fs read block (indir 2 2)" |
| 1697 | "malloc failed. **\n"); |
| 1698 | return -1; |
| 1699 | } |
| 1700 | ext4fs_indir2_size = blksz; |
| 1701 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1702 | if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1703 | log2_blksz) != ext4fs_indir2_blkno) { |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1704 | status = ext4fs_devread((lbaint_t)le32_to_cpu |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1705 | (ext4fs_indir1_block |
| 1706 | [rblock / |
| 1707 | perblock]) << log2_blksz, 0, |
| 1708 | blksz, |
| 1709 | (char *)ext4fs_indir2_block); |
| 1710 | if (status == 0) { |
| 1711 | printf("** DI ext2fs read block (indir 2 2)" |
| 1712 | "failed. **\n"); |
| 1713 | return -1; |
| 1714 | } |
| 1715 | ext4fs_indir2_blkno = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1716 | le32_to_cpu(ext4fs_indir1_block[rblock |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1717 | / |
| 1718 | perblock]) << |
| 1719 | log2_blksz; |
| 1720 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1721 | blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1722 | } |
| 1723 | /* Tripple indirect. */ |
| 1724 | else { |
| 1725 | rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + |
| 1726 | (blksz / 4 * blksz / 4)); |
| 1727 | perblock_child = blksz / 4; |
| 1728 | perblock_parent = ((blksz / 4) * (blksz / 4)); |
| 1729 | |
| 1730 | if (ext4fs_indir1_block == NULL) { |
| 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 | ext4fs_indir1_blkno = -1; |
| 1739 | } |
| 1740 | if (blksz != ext4fs_indir1_size) { |
| 1741 | free(ext4fs_indir1_block); |
| 1742 | ext4fs_indir1_block = NULL; |
| 1743 | ext4fs_indir1_size = 0; |
| 1744 | ext4fs_indir1_blkno = -1; |
| 1745 | ext4fs_indir1_block = zalloc(blksz); |
| 1746 | if (ext4fs_indir1_block == NULL) { |
| 1747 | printf("** TI ext2fs read block (indir 2 1)" |
| 1748 | "malloc failed. **\n"); |
| 1749 | return -1; |
| 1750 | } |
| 1751 | ext4fs_indir1_size = blksz; |
| 1752 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1753 | if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1754 | log2_blksz) != ext4fs_indir1_blkno) { |
| 1755 | status = ext4fs_devread |
Frederic Leroy | 04735e9 | 2013-06-26 18:11:25 +0200 | [diff] [blame] | 1756 | ((lbaint_t) |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1757 | le32_to_cpu(inode->b.blocks.triple_indir_block) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1758 | << log2_blksz, 0, blksz, |
| 1759 | (char *)ext4fs_indir1_block); |
| 1760 | if (status == 0) { |
| 1761 | printf("** TI ext2fs read block (indir 2 1)" |
| 1762 | "failed. **\n"); |
| 1763 | return -1; |
| 1764 | } |
| 1765 | ext4fs_indir1_blkno = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1766 | le32_to_cpu(inode->b.blocks.triple_indir_block) << |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1767 | log2_blksz; |
| 1768 | } |
| 1769 | |
| 1770 | if (ext4fs_indir2_block == NULL) { |
| 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 | ext4fs_indir2_blkno = -1; |
| 1779 | } |
| 1780 | if (blksz != ext4fs_indir2_size) { |
| 1781 | free(ext4fs_indir2_block); |
| 1782 | ext4fs_indir2_block = NULL; |
| 1783 | ext4fs_indir2_size = 0; |
| 1784 | ext4fs_indir2_blkno = -1; |
| 1785 | ext4fs_indir2_block = zalloc(blksz); |
| 1786 | if (ext4fs_indir2_block == NULL) { |
| 1787 | printf("** TI ext2fs read block (indir 2 2)" |
| 1788 | "malloc failed. **\n"); |
| 1789 | return -1; |
| 1790 | } |
| 1791 | ext4fs_indir2_size = blksz; |
| 1792 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1793 | if ((le32_to_cpu(ext4fs_indir1_block[rblock / |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1794 | perblock_parent]) << |
| 1795 | log2_blksz) |
| 1796 | != ext4fs_indir2_blkno) { |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1797 | status = ext4fs_devread((lbaint_t)le32_to_cpu |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1798 | (ext4fs_indir1_block |
| 1799 | [rblock / |
| 1800 | perblock_parent]) << |
| 1801 | log2_blksz, 0, blksz, |
| 1802 | (char *)ext4fs_indir2_block); |
| 1803 | if (status == 0) { |
| 1804 | printf("** TI ext2fs read block (indir 2 2)" |
| 1805 | "failed. **\n"); |
| 1806 | return -1; |
| 1807 | } |
| 1808 | ext4fs_indir2_blkno = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1809 | le32_to_cpu(ext4fs_indir1_block[rblock / |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1810 | perblock_parent]) |
| 1811 | << log2_blksz; |
| 1812 | } |
| 1813 | |
| 1814 | if (ext4fs_indir3_block == NULL) { |
| 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 | ext4fs_indir3_blkno = -1; |
| 1823 | } |
| 1824 | if (blksz != ext4fs_indir3_size) { |
| 1825 | free(ext4fs_indir3_block); |
| 1826 | ext4fs_indir3_block = NULL; |
| 1827 | ext4fs_indir3_size = 0; |
| 1828 | ext4fs_indir3_blkno = -1; |
| 1829 | ext4fs_indir3_block = zalloc(blksz); |
| 1830 | if (ext4fs_indir3_block == NULL) { |
| 1831 | printf("** TI ext2fs read block (indir 2 2)" |
| 1832 | "malloc failed. **\n"); |
| 1833 | return -1; |
| 1834 | } |
| 1835 | ext4fs_indir3_size = blksz; |
| 1836 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1837 | if ((le32_to_cpu(ext4fs_indir2_block[rblock |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1838 | / |
| 1839 | perblock_child]) << |
| 1840 | log2_blksz) != ext4fs_indir3_blkno) { |
| 1841 | status = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1842 | ext4fs_devread((lbaint_t)le32_to_cpu |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1843 | (ext4fs_indir2_block |
| 1844 | [(rblock / perblock_child) |
| 1845 | % (blksz / 4)]) << log2_blksz, 0, |
| 1846 | blksz, (char *)ext4fs_indir3_block); |
| 1847 | if (status == 0) { |
| 1848 | printf("** TI ext2fs read block (indir 2 2)" |
| 1849 | "failed. **\n"); |
| 1850 | return -1; |
| 1851 | } |
| 1852 | ext4fs_indir3_blkno = |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1853 | le32_to_cpu(ext4fs_indir2_block[(rblock / |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1854 | perblock_child) % |
| 1855 | (blksz / |
| 1856 | 4)]) << |
| 1857 | log2_blksz; |
| 1858 | } |
| 1859 | |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1860 | blknr = le32_to_cpu(ext4fs_indir3_block |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1861 | [rblock % perblock_child]); |
| 1862 | } |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 1863 | debug("read_allocated_block %ld\n", blknr); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1864 | |
| 1865 | return blknr; |
| 1866 | } |
| 1867 | |
Łukasz Majewski | 8b454ee | 2014-05-06 09:36:05 +0200 | [diff] [blame] | 1868 | /** |
| 1869 | * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's |
| 1870 | * global pointers |
| 1871 | * |
| 1872 | * This function assures that for a file with the same name but different size |
| 1873 | * the sequential store on the ext4 filesystem will be correct. |
| 1874 | * |
| 1875 | * In this function the global data, responsible for internal representation |
| 1876 | * of the ext4 data are initialized to the reset state. Without this, during |
| 1877 | * replacement of the smaller file with the bigger truncation of new file was |
| 1878 | * performed. |
| 1879 | */ |
| 1880 | void ext4fs_reinit_global(void) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1881 | { |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1882 | if (ext4fs_indir1_block != NULL) { |
| 1883 | free(ext4fs_indir1_block); |
| 1884 | ext4fs_indir1_block = NULL; |
| 1885 | ext4fs_indir1_size = 0; |
| 1886 | ext4fs_indir1_blkno = -1; |
| 1887 | } |
| 1888 | if (ext4fs_indir2_block != NULL) { |
| 1889 | free(ext4fs_indir2_block); |
| 1890 | ext4fs_indir2_block = NULL; |
| 1891 | ext4fs_indir2_size = 0; |
| 1892 | ext4fs_indir2_blkno = -1; |
| 1893 | } |
| 1894 | if (ext4fs_indir3_block != NULL) { |
| 1895 | free(ext4fs_indir3_block); |
| 1896 | ext4fs_indir3_block = NULL; |
| 1897 | ext4fs_indir3_size = 0; |
| 1898 | ext4fs_indir3_blkno = -1; |
| 1899 | } |
| 1900 | } |
Łukasz Majewski | 8b454ee | 2014-05-06 09:36:05 +0200 | [diff] [blame] | 1901 | void ext4fs_close(void) |
| 1902 | { |
| 1903 | if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { |
| 1904 | ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); |
| 1905 | ext4fs_file = NULL; |
| 1906 | } |
| 1907 | if (ext4fs_root != NULL) { |
| 1908 | free(ext4fs_root); |
| 1909 | ext4fs_root = NULL; |
| 1910 | } |
| 1911 | |
| 1912 | ext4fs_reinit_global(); |
| 1913 | } |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1914 | |
| 1915 | int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, |
| 1916 | struct ext2fs_node **fnode, int *ftype) |
| 1917 | { |
| 1918 | unsigned int fpos = 0; |
| 1919 | int status; |
Suriyan Ramasami | 9f12cd0 | 2014-11-17 14:39:36 -0800 | [diff] [blame] | 1920 | loff_t actread; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1921 | struct ext2fs_node *diro = (struct ext2fs_node *) dir; |
| 1922 | |
| 1923 | #ifdef DEBUG |
| 1924 | if (name != NULL) |
| 1925 | printf("Iterate dir %s\n", name); |
| 1926 | #endif /* of DEBUG */ |
| 1927 | if (!diro->inode_read) { |
| 1928 | status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); |
| 1929 | if (status == 0) |
| 1930 | return 0; |
| 1931 | } |
| 1932 | /* Search the file. */ |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1933 | while (fpos < le32_to_cpu(diro->inode.size)) { |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1934 | struct ext2_dirent dirent; |
| 1935 | |
| 1936 | status = ext4fs_read_file(diro, fpos, |
| 1937 | sizeof(struct ext2_dirent), |
Suriyan Ramasami | 9f12cd0 | 2014-11-17 14:39:36 -0800 | [diff] [blame] | 1938 | (char *)&dirent, &actread); |
| 1939 | if (status < 0) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1940 | return 0; |
| 1941 | |
Thomas Fitzsimmons | 54d68e9 | 2015-11-18 12:42:53 -0500 | [diff] [blame] | 1942 | if (dirent.direntlen == 0) { |
| 1943 | printf("Failed to iterate over directory %s\n", name); |
| 1944 | return 0; |
| 1945 | } |
| 1946 | |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1947 | if (dirent.namelen != 0) { |
| 1948 | char filename[dirent.namelen + 1]; |
| 1949 | struct ext2fs_node *fdiro; |
| 1950 | int type = FILETYPE_UNKNOWN; |
| 1951 | |
| 1952 | status = ext4fs_read_file(diro, |
| 1953 | fpos + |
| 1954 | sizeof(struct ext2_dirent), |
Suriyan Ramasami | 9f12cd0 | 2014-11-17 14:39:36 -0800 | [diff] [blame] | 1955 | dirent.namelen, filename, |
| 1956 | &actread); |
| 1957 | if (status < 0) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1958 | return 0; |
| 1959 | |
| 1960 | fdiro = zalloc(sizeof(struct ext2fs_node)); |
| 1961 | if (!fdiro) |
| 1962 | return 0; |
| 1963 | |
| 1964 | fdiro->data = diro->data; |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1965 | fdiro->ino = le32_to_cpu(dirent.inode); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1966 | |
| 1967 | filename[dirent.namelen] = '\0'; |
| 1968 | |
| 1969 | if (dirent.filetype != FILETYPE_UNKNOWN) { |
| 1970 | fdiro->inode_read = 0; |
| 1971 | |
| 1972 | if (dirent.filetype == FILETYPE_DIRECTORY) |
| 1973 | type = FILETYPE_DIRECTORY; |
| 1974 | else if (dirent.filetype == FILETYPE_SYMLINK) |
| 1975 | type = FILETYPE_SYMLINK; |
| 1976 | else if (dirent.filetype == FILETYPE_REG) |
| 1977 | type = FILETYPE_REG; |
| 1978 | } else { |
| 1979 | status = ext4fs_read_inode(diro->data, |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1980 | le32_to_cpu |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1981 | (dirent.inode), |
| 1982 | &fdiro->inode); |
| 1983 | if (status == 0) { |
| 1984 | free(fdiro); |
| 1985 | return 0; |
| 1986 | } |
| 1987 | fdiro->inode_read = 1; |
| 1988 | |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1989 | if ((le16_to_cpu(fdiro->inode.mode) & |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1990 | FILETYPE_INO_MASK) == |
| 1991 | FILETYPE_INO_DIRECTORY) { |
| 1992 | type = FILETYPE_DIRECTORY; |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1993 | } else if ((le16_to_cpu(fdiro->inode.mode) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1994 | & FILETYPE_INO_MASK) == |
| 1995 | FILETYPE_INO_SYMLINK) { |
| 1996 | type = FILETYPE_SYMLINK; |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 1997 | } else if ((le16_to_cpu(fdiro->inode.mode) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 1998 | & FILETYPE_INO_MASK) == |
| 1999 | FILETYPE_INO_REG) { |
| 2000 | type = FILETYPE_REG; |
| 2001 | } |
| 2002 | } |
| 2003 | #ifdef DEBUG |
| 2004 | printf("iterate >%s<\n", filename); |
| 2005 | #endif /* of DEBUG */ |
| 2006 | if ((name != NULL) && (fnode != NULL) |
| 2007 | && (ftype != NULL)) { |
| 2008 | if (strcmp(filename, name) == 0) { |
| 2009 | *ftype = type; |
| 2010 | *fnode = fdiro; |
| 2011 | return 1; |
| 2012 | } |
| 2013 | } else { |
| 2014 | if (fdiro->inode_read == 0) { |
| 2015 | status = ext4fs_read_inode(diro->data, |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2016 | le32_to_cpu( |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2017 | dirent.inode), |
| 2018 | &fdiro->inode); |
| 2019 | if (status == 0) { |
| 2020 | free(fdiro); |
| 2021 | return 0; |
| 2022 | } |
| 2023 | fdiro->inode_read = 1; |
| 2024 | } |
| 2025 | switch (type) { |
| 2026 | case FILETYPE_DIRECTORY: |
| 2027 | printf("<DIR> "); |
| 2028 | break; |
| 2029 | case FILETYPE_SYMLINK: |
| 2030 | printf("<SYM> "); |
| 2031 | break; |
| 2032 | case FILETYPE_REG: |
| 2033 | printf(" "); |
| 2034 | break; |
| 2035 | default: |
| 2036 | printf("< ? > "); |
| 2037 | break; |
| 2038 | } |
Suriyan Ramasami | 9f12cd0 | 2014-11-17 14:39:36 -0800 | [diff] [blame] | 2039 | printf("%10u %s\n", |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2040 | le32_to_cpu(fdiro->inode.size), |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2041 | filename); |
| 2042 | } |
| 2043 | free(fdiro); |
| 2044 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2045 | fpos += le16_to_cpu(dirent.direntlen); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2046 | } |
| 2047 | return 0; |
| 2048 | } |
| 2049 | |
| 2050 | static char *ext4fs_read_symlink(struct ext2fs_node *node) |
| 2051 | { |
| 2052 | char *symlink; |
| 2053 | struct ext2fs_node *diro = node; |
| 2054 | int status; |
Suriyan Ramasami | 9f12cd0 | 2014-11-17 14:39:36 -0800 | [diff] [blame] | 2055 | loff_t actread; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2056 | |
| 2057 | if (!diro->inode_read) { |
| 2058 | status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); |
| 2059 | if (status == 0) |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 2060 | return NULL; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2061 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2062 | symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2063 | if (!symlink) |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 2064 | return NULL; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2065 | |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2066 | if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2067 | strncpy(symlink, diro->inode.b.symlink, |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2068 | le32_to_cpu(diro->inode.size)); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2069 | } else { |
| 2070 | status = ext4fs_read_file(diro, 0, |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2071 | le32_to_cpu(diro->inode.size), |
Suriyan Ramasami | 9f12cd0 | 2014-11-17 14:39:36 -0800 | [diff] [blame] | 2072 | symlink, &actread); |
Gary Bisson | 9d2f6a9 | 2015-09-07 11:20:07 +0200 | [diff] [blame] | 2073 | if ((status < 0) || (actread == 0)) { |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2074 | free(symlink); |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 2075 | return NULL; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2076 | } |
| 2077 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2078 | symlink[le32_to_cpu(diro->inode.size)] = '\0'; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2079 | return symlink; |
| 2080 | } |
| 2081 | |
| 2082 | static int ext4fs_find_file1(const char *currpath, |
| 2083 | struct ext2fs_node *currroot, |
| 2084 | struct ext2fs_node **currfound, int *foundtype) |
| 2085 | { |
| 2086 | char fpath[strlen(currpath) + 1]; |
| 2087 | char *name = fpath; |
| 2088 | char *next; |
| 2089 | int status; |
| 2090 | int type = FILETYPE_DIRECTORY; |
| 2091 | struct ext2fs_node *currnode = currroot; |
| 2092 | struct ext2fs_node *oldnode = currroot; |
| 2093 | |
| 2094 | strncpy(fpath, currpath, strlen(currpath) + 1); |
| 2095 | |
| 2096 | /* Remove all leading slashes. */ |
| 2097 | while (*name == '/') |
| 2098 | name++; |
| 2099 | |
| 2100 | if (!*name) { |
| 2101 | *currfound = currnode; |
| 2102 | return 1; |
| 2103 | } |
| 2104 | |
| 2105 | for (;;) { |
| 2106 | int found; |
| 2107 | |
| 2108 | /* Extract the actual part from the pathname. */ |
| 2109 | next = strchr(name, '/'); |
| 2110 | if (next) { |
| 2111 | /* Remove all leading slashes. */ |
| 2112 | while (*next == '/') |
| 2113 | *(next++) = '\0'; |
| 2114 | } |
| 2115 | |
| 2116 | if (type != FILETYPE_DIRECTORY) { |
| 2117 | ext4fs_free_node(currnode, currroot); |
| 2118 | return 0; |
| 2119 | } |
| 2120 | |
| 2121 | oldnode = currnode; |
| 2122 | |
| 2123 | /* Iterate over the directory. */ |
| 2124 | found = ext4fs_iterate_dir(currnode, name, &currnode, &type); |
| 2125 | if (found == 0) |
| 2126 | return 0; |
| 2127 | |
| 2128 | if (found == -1) |
| 2129 | break; |
| 2130 | |
| 2131 | /* Read in the symlink and follow it. */ |
| 2132 | if (type == FILETYPE_SYMLINK) { |
| 2133 | char *symlink; |
| 2134 | |
| 2135 | /* Test if the symlink does not loop. */ |
| 2136 | if (++symlinknest == 8) { |
| 2137 | ext4fs_free_node(currnode, currroot); |
| 2138 | ext4fs_free_node(oldnode, currroot); |
| 2139 | return 0; |
| 2140 | } |
| 2141 | |
| 2142 | symlink = ext4fs_read_symlink(currnode); |
| 2143 | ext4fs_free_node(currnode, currroot); |
| 2144 | |
| 2145 | if (!symlink) { |
| 2146 | ext4fs_free_node(oldnode, currroot); |
| 2147 | return 0; |
| 2148 | } |
| 2149 | |
| 2150 | debug("Got symlink >%s<\n", symlink); |
| 2151 | |
| 2152 | if (symlink[0] == '/') { |
| 2153 | ext4fs_free_node(oldnode, currroot); |
| 2154 | oldnode = &ext4fs_root->diropen; |
| 2155 | } |
| 2156 | |
| 2157 | /* Lookup the node the symlink points to. */ |
| 2158 | status = ext4fs_find_file1(symlink, oldnode, |
| 2159 | &currnode, &type); |
| 2160 | |
| 2161 | free(symlink); |
| 2162 | |
| 2163 | if (status == 0) { |
| 2164 | ext4fs_free_node(oldnode, currroot); |
| 2165 | return 0; |
| 2166 | } |
| 2167 | } |
| 2168 | |
| 2169 | ext4fs_free_node(oldnode, currroot); |
| 2170 | |
| 2171 | /* Found the node! */ |
| 2172 | if (!next || *next == '\0') { |
| 2173 | *currfound = currnode; |
| 2174 | *foundtype = type; |
| 2175 | return 1; |
| 2176 | } |
| 2177 | name = next; |
| 2178 | } |
| 2179 | return -1; |
| 2180 | } |
| 2181 | |
| 2182 | int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, |
| 2183 | struct ext2fs_node **foundnode, int expecttype) |
| 2184 | { |
| 2185 | int status; |
| 2186 | int foundtype = FILETYPE_DIRECTORY; |
| 2187 | |
| 2188 | symlinknest = 0; |
| 2189 | if (!path) |
| 2190 | return 0; |
| 2191 | |
| 2192 | status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); |
| 2193 | if (status == 0) |
| 2194 | return 0; |
| 2195 | |
| 2196 | /* Check if the node that was found was of the expected type. */ |
| 2197 | if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) |
| 2198 | return 0; |
| 2199 | else if ((expecttype == FILETYPE_DIRECTORY) |
| 2200 | && (foundtype != expecttype)) |
| 2201 | return 0; |
| 2202 | |
| 2203 | return 1; |
| 2204 | } |
| 2205 | |
Suriyan Ramasami | 9f12cd0 | 2014-11-17 14:39:36 -0800 | [diff] [blame] | 2206 | int ext4fs_open(const char *filename, loff_t *len) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2207 | { |
| 2208 | struct ext2fs_node *fdiro = NULL; |
| 2209 | int status; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2210 | |
| 2211 | if (ext4fs_root == NULL) |
| 2212 | return -1; |
| 2213 | |
| 2214 | ext4fs_file = NULL; |
| 2215 | status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, |
| 2216 | FILETYPE_REG); |
| 2217 | if (status == 0) |
| 2218 | goto fail; |
| 2219 | |
| 2220 | if (!fdiro->inode_read) { |
| 2221 | status = ext4fs_read_inode(fdiro->data, fdiro->ino, |
| 2222 | &fdiro->inode); |
| 2223 | if (status == 0) |
| 2224 | goto fail; |
| 2225 | } |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2226 | *len = le32_to_cpu(fdiro->inode.size); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2227 | ext4fs_file = fdiro; |
| 2228 | |
Suriyan Ramasami | 9f12cd0 | 2014-11-17 14:39:36 -0800 | [diff] [blame] | 2229 | return 0; |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2230 | fail: |
| 2231 | ext4fs_free_node(fdiro, &ext4fs_root->diropen); |
| 2232 | |
| 2233 | return -1; |
| 2234 | } |
| 2235 | |
| 2236 | int ext4fs_mount(unsigned part_length) |
| 2237 | { |
| 2238 | struct ext2_data *data; |
| 2239 | int status; |
| 2240 | struct ext_filesystem *fs = get_fs(); |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 2241 | data = zalloc(SUPERBLOCK_SIZE); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2242 | if (!data) |
| 2243 | return 0; |
| 2244 | |
| 2245 | /* Read the superblock. */ |
Egbert Eich | 50ce4c0 | 2013-05-01 01:13:19 +0000 | [diff] [blame] | 2246 | status = ext4_read_superblock((char *)&data->sblock); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2247 | |
| 2248 | if (status == 0) |
| 2249 | goto fail; |
| 2250 | |
| 2251 | /* Make sure this is an ext2 filesystem. */ |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2252 | if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2253 | goto fail; |
| 2254 | |
Tom Rini | 6f94ab6 | 2016-07-22 17:59:11 -0400 | [diff] [blame] | 2255 | /* |
| 2256 | * The 64bit feature was enabled when metadata_csum was enabled |
| 2257 | * and we do not support metadata_csum (and cannot reliably find |
| 2258 | * files when it is set. Refuse to mount. |
| 2259 | */ |
Michael Walle | 58a9ecb | 2016-09-01 11:21:40 +0200 | [diff] [blame] | 2260 | if (le32_to_cpu(data->sblock.feature_incompat) & EXT4_FEATURE_INCOMPAT_64BIT) { |
Tom Rini | 6f94ab6 | 2016-07-22 17:59:11 -0400 | [diff] [blame] | 2261 | printf("Unsupported feature found (64bit, possibly metadata_csum), not mounting\n"); |
| 2262 | goto fail; |
| 2263 | } |
| 2264 | |
Michael Walle | 011bc33 | 2016-08-29 10:46:46 +0200 | [diff] [blame] | 2265 | if (le32_to_cpu(data->sblock.revision_level) == 0) |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2266 | fs->inodesz = 128; |
| 2267 | else |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2268 | fs->inodesz = le16_to_cpu(data->sblock.inode_size); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2269 | |
| 2270 | debug("EXT2 rev %d, inode_size %d\n", |
Michael Walle | 7f101be | 2016-08-29 10:46:44 +0200 | [diff] [blame] | 2271 | le32_to_cpu(data->sblock.revision_level), fs->inodesz); |
Uma Shankar | a159643 | 2012-05-25 21:21:44 +0530 | [diff] [blame] | 2272 | |
| 2273 | data->diropen.data = data; |
| 2274 | data->diropen.ino = 2; |
| 2275 | data->diropen.inode_read = 1; |
| 2276 | data->inode = &data->diropen.inode; |
| 2277 | |
| 2278 | status = ext4fs_read_inode(data, 2, data->inode); |
| 2279 | if (status == 0) |
| 2280 | goto fail; |
| 2281 | |
| 2282 | ext4fs_root = data; |
| 2283 | |
| 2284 | return 1; |
| 2285 | fail: |
| 2286 | printf("Failed to mount ext2 filesystem...\n"); |
| 2287 | free(data); |
| 2288 | ext4fs_root = NULL; |
| 2289 | |
| 2290 | return 0; |
| 2291 | } |