Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 17 | #include "ext4_utils.h" |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 18 | #include "indirect.h" |
| 19 | #include "allocate.h" |
| 20 | |
Colin Cross | dc5abee | 2012-04-23 23:20:48 -0700 | [diff] [blame] | 21 | #include <sparse/sparse.h> |
| 22 | |
Colin Cross | 33f96c6 | 2010-12-22 18:40:14 -0800 | [diff] [blame] | 23 | #include <stdlib.h> |
| 24 | #include <stdio.h> |
| 25 | |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 26 | /* Creates data buffers for the first backing_len bytes of a block allocation |
| 27 | and queues them to be written */ |
| 28 | static u8 *create_backing(struct block_allocation *alloc, |
| 29 | unsigned long backing_len) |
| 30 | { |
| 31 | if (DIV_ROUND_UP(backing_len, info.block_size) > EXT4_NDIR_BLOCKS) |
| 32 | critical_error("indirect backing larger than %d blocks", EXT4_NDIR_BLOCKS); |
| 33 | |
| 34 | u8 *data = calloc(backing_len, 1); |
| 35 | if (!data) |
| 36 | critical_error_errno("calloc"); |
| 37 | |
| 38 | u8 *ptr = data; |
| 39 | for (; alloc != NULL && backing_len > 0; get_next_region(alloc)) { |
| 40 | u32 region_block; |
| 41 | u32 region_len; |
| 42 | u32 len; |
| 43 | get_region(alloc, ®ion_block, ®ion_len); |
| 44 | |
| 45 | len = min(region_len * info.block_size, backing_len); |
| 46 | |
Colin Cross | 782879a | 2014-01-23 13:08:16 -0800 | [diff] [blame] | 47 | sparse_file_add_data(ext4_sparse_file, ptr, len, region_block); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 48 | ptr += len; |
| 49 | backing_len -= len; |
| 50 | } |
| 51 | |
| 52 | return data; |
| 53 | } |
| 54 | |
| 55 | static void reserve_indirect_block(struct block_allocation *alloc, int len) |
| 56 | { |
| 57 | if (reserve_oob_blocks(alloc, 1)) { |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 58 | error("failed to reserve oob block"); |
| 59 | return; |
| 60 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 61 | |
| 62 | if (advance_blocks(alloc, len)) { |
| 63 | error("failed to advance %d blocks", len); |
| 64 | return; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | static void reserve_dindirect_block(struct block_allocation *alloc, int len) |
| 69 | { |
| 70 | if (reserve_oob_blocks(alloc, 1)) { |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 71 | error("failed to reserve oob block"); |
| 72 | return; |
| 73 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 74 | |
| 75 | while (len > 0) { |
| 76 | int ind_block_len = min((int)aux_info.blocks_per_ind, len); |
| 77 | |
| 78 | reserve_indirect_block(alloc, ind_block_len); |
| 79 | |
| 80 | len -= ind_block_len; |
| 81 | } |
| 82 | |
| 83 | } |
| 84 | |
| 85 | static void reserve_tindirect_block(struct block_allocation *alloc, int len) |
| 86 | { |
| 87 | if (reserve_oob_blocks(alloc, 1)) { |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 88 | error("failed to reserve oob block"); |
| 89 | return; |
| 90 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 91 | |
| 92 | while (len > 0) { |
| 93 | int dind_block_len = min((int)aux_info.blocks_per_dind, len); |
| 94 | |
| 95 | reserve_dindirect_block(alloc, dind_block_len); |
| 96 | |
| 97 | len -= dind_block_len; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | static void fill_indirect_block(u32 *ind_block, int len, struct block_allocation *alloc) |
| 102 | { |
| 103 | int i; |
| 104 | for (i = 0; i < len; i++) { |
| 105 | ind_block[i] = get_block(alloc, i); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | static void fill_dindirect_block(u32 *dind_block, int len, struct block_allocation *alloc) |
| 110 | { |
| 111 | int i; |
| 112 | u32 ind_block; |
| 113 | |
| 114 | for (i = 0; len > 0; i++) { |
| 115 | ind_block = get_oob_block(alloc, 0); |
| 116 | if (advance_oob_blocks(alloc, 1)) { |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 117 | error("failed to reserve oob block"); |
| 118 | return; |
| 119 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 120 | |
| 121 | dind_block[i] = ind_block; |
| 122 | |
| 123 | u32 *ind_block_data = calloc(info.block_size, 1); |
Colin Cross | 782879a | 2014-01-23 13:08:16 -0800 | [diff] [blame] | 124 | sparse_file_add_data(ext4_sparse_file, ind_block_data, info.block_size, |
Colin Cross | f0ee37f | 2012-04-24 17:48:43 -0700 | [diff] [blame] | 125 | ind_block); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 126 | int ind_block_len = min((int)aux_info.blocks_per_ind, len); |
| 127 | |
| 128 | fill_indirect_block(ind_block_data, ind_block_len, alloc); |
| 129 | |
| 130 | if (advance_blocks(alloc, ind_block_len)) { |
| 131 | error("failed to advance %d blocks", ind_block_len); |
| 132 | return; |
| 133 | } |
| 134 | |
| 135 | len -= ind_block_len; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | static void fill_tindirect_block(u32 *tind_block, int len, struct block_allocation *alloc) |
| 140 | { |
| 141 | int i; |
| 142 | u32 dind_block; |
| 143 | |
| 144 | for (i = 0; len > 0; i++) { |
| 145 | dind_block = get_oob_block(alloc, 0); |
| 146 | if (advance_oob_blocks(alloc, 1)) { |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 147 | error("failed to reserve oob block"); |
| 148 | return; |
| 149 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 150 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 151 | tind_block[i] = dind_block; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 152 | |
| 153 | u32 *dind_block_data = calloc(info.block_size, 1); |
Colin Cross | 782879a | 2014-01-23 13:08:16 -0800 | [diff] [blame] | 154 | sparse_file_add_data(ext4_sparse_file, dind_block_data, info.block_size, |
Colin Cross | f0ee37f | 2012-04-24 17:48:43 -0700 | [diff] [blame] | 155 | dind_block); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 156 | int dind_block_len = min((int)aux_info.blocks_per_dind, len); |
| 157 | |
| 158 | fill_dindirect_block(dind_block_data, dind_block_len, alloc); |
| 159 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 160 | len -= dind_block_len; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 161 | } |
| 162 | } |
| 163 | |
| 164 | /* Given an allocation, attach as many blocks as possible to direct inode |
| 165 | blocks, and return the rest */ |
| 166 | static int inode_attach_direct_blocks(struct ext4_inode *inode, |
| 167 | struct block_allocation *alloc, u32 *block_len) |
| 168 | { |
| 169 | int len = min(*block_len, EXT4_NDIR_BLOCKS); |
| 170 | int i; |
| 171 | |
| 172 | for (i = 0; i < len; i++) { |
| 173 | inode->i_block[i] = get_block(alloc, i); |
| 174 | } |
| 175 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 176 | if (advance_blocks(alloc, len)) { |
| 177 | error("failed to advance %d blocks", len); |
| 178 | return -1; |
| 179 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 180 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 181 | *block_len -= len; |
| 182 | return 0; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | /* Given an allocation, attach as many blocks as possible to indirect blocks, |
| 186 | and return the rest |
| 187 | Assumes that the blocks necessary to hold the indirect blocks were included |
| 188 | as part of the allocation */ |
| 189 | static int inode_attach_indirect_blocks(struct ext4_inode *inode, |
| 190 | struct block_allocation *alloc, u32 *block_len) |
| 191 | { |
| 192 | int len = min(*block_len, aux_info.blocks_per_ind); |
| 193 | |
| 194 | int ind_block = get_oob_block(alloc, 0); |
| 195 | inode->i_block[EXT4_IND_BLOCK] = ind_block; |
| 196 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 197 | if (advance_oob_blocks(alloc, 1)) { |
| 198 | error("failed to advance oob block"); |
| 199 | return -1; |
| 200 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 201 | |
| 202 | u32 *ind_block_data = calloc(info.block_size, 1); |
Colin Cross | 782879a | 2014-01-23 13:08:16 -0800 | [diff] [blame] | 203 | sparse_file_add_data(ext4_sparse_file, ind_block_data, info.block_size, |
Colin Cross | f0ee37f | 2012-04-24 17:48:43 -0700 | [diff] [blame] | 204 | ind_block); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 205 | |
| 206 | fill_indirect_block(ind_block_data, len, alloc); |
| 207 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 208 | if (advance_blocks(alloc, len)) { |
| 209 | error("failed to advance %d blocks", len); |
| 210 | return -1; |
| 211 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 212 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 213 | *block_len -= len; |
| 214 | return 0; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | /* Given an allocation, attach as many blocks as possible to doubly indirect |
| 218 | blocks, and return the rest. |
| 219 | Assumes that the blocks necessary to hold the indirect and doubly indirect |
| 220 | blocks were included as part of the allocation */ |
| 221 | static int inode_attach_dindirect_blocks(struct ext4_inode *inode, |
| 222 | struct block_allocation *alloc, u32 *block_len) |
| 223 | { |
| 224 | int len = min(*block_len, aux_info.blocks_per_dind); |
| 225 | |
| 226 | int dind_block = get_oob_block(alloc, 0); |
| 227 | inode->i_block[EXT4_DIND_BLOCK] = dind_block; |
| 228 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 229 | if (advance_oob_blocks(alloc, 1)) { |
| 230 | error("failed to advance oob block"); |
| 231 | return -1; |
| 232 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 233 | |
| 234 | u32 *dind_block_data = calloc(info.block_size, 1); |
Colin Cross | 782879a | 2014-01-23 13:08:16 -0800 | [diff] [blame] | 235 | sparse_file_add_data(ext4_sparse_file, dind_block_data, info.block_size, |
Colin Cross | f0ee37f | 2012-04-24 17:48:43 -0700 | [diff] [blame] | 236 | dind_block); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 237 | |
| 238 | fill_dindirect_block(dind_block_data, len, alloc); |
| 239 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 240 | if (advance_blocks(alloc, len)) { |
| 241 | error("failed to advance %d blocks", len); |
| 242 | return -1; |
| 243 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 244 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 245 | *block_len -= len; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | /* Given an allocation, attach as many blocks as possible to triply indirect |
| 250 | blocks, and return the rest. |
| 251 | Assumes that the blocks necessary to hold the indirect, doubly indirect and |
| 252 | triply indirect blocks were included as part of the allocation */ |
| 253 | static int inode_attach_tindirect_blocks(struct ext4_inode *inode, |
| 254 | struct block_allocation *alloc, u32 *block_len) |
| 255 | { |
| 256 | int len = min(*block_len, aux_info.blocks_per_tind); |
| 257 | |
| 258 | int tind_block = get_oob_block(alloc, 0); |
| 259 | inode->i_block[EXT4_TIND_BLOCK] = tind_block; |
| 260 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 261 | if (advance_oob_blocks(alloc, 1)) { |
| 262 | error("failed to advance oob block"); |
| 263 | return -1; |
| 264 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 265 | |
| 266 | u32 *tind_block_data = calloc(info.block_size, 1); |
Colin Cross | 782879a | 2014-01-23 13:08:16 -0800 | [diff] [blame] | 267 | sparse_file_add_data(ext4_sparse_file, tind_block_data, info.block_size, |
Colin Cross | f0ee37f | 2012-04-24 17:48:43 -0700 | [diff] [blame] | 268 | tind_block); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 269 | |
| 270 | fill_tindirect_block(tind_block_data, len, alloc); |
| 271 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 272 | if (advance_blocks(alloc, len)) { |
| 273 | error("failed to advance %d blocks", len); |
| 274 | return -1; |
| 275 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 276 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 277 | *block_len -= len; |
| 278 | return 0; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | static void reserve_all_indirect_blocks(struct block_allocation *alloc, u32 len) |
| 282 | { |
| 283 | if (len <= EXT4_NDIR_BLOCKS) |
| 284 | return; |
| 285 | |
| 286 | len -= EXT4_NDIR_BLOCKS; |
| 287 | advance_blocks(alloc, EXT4_NDIR_BLOCKS); |
| 288 | |
| 289 | u32 ind_block_len = min(aux_info.blocks_per_ind, len); |
| 290 | reserve_indirect_block(alloc, ind_block_len); |
| 291 | |
| 292 | len -= ind_block_len; |
| 293 | if (len == 0) |
| 294 | return; |
| 295 | |
| 296 | u32 dind_block_len = min(aux_info.blocks_per_dind, len); |
| 297 | reserve_dindirect_block(alloc, dind_block_len); |
| 298 | |
| 299 | len -= dind_block_len; |
| 300 | if (len == 0) |
| 301 | return; |
| 302 | |
| 303 | u32 tind_block_len = min(aux_info.blocks_per_tind, len); |
| 304 | reserve_tindirect_block(alloc, tind_block_len); |
| 305 | |
| 306 | len -= tind_block_len; |
| 307 | if (len == 0) |
| 308 | return; |
| 309 | |
| 310 | error("%d blocks remaining", len); |
| 311 | } |
| 312 | |
| 313 | static u32 indirect_blocks_needed(u32 len) |
| 314 | { |
| 315 | u32 ind = 0; |
| 316 | |
| 317 | if (len <= EXT4_NDIR_BLOCKS) |
| 318 | return ind; |
| 319 | |
| 320 | len -= EXT4_NDIR_BLOCKS; |
| 321 | |
| 322 | /* We will need an indirect block for the rest of the blocks */ |
| 323 | ind += DIV_ROUND_UP(len, aux_info.blocks_per_ind); |
| 324 | |
| 325 | if (len <= aux_info.blocks_per_ind) |
| 326 | return ind; |
| 327 | |
| 328 | len -= aux_info.blocks_per_ind; |
| 329 | |
| 330 | ind += DIV_ROUND_UP(len, aux_info.blocks_per_dind); |
| 331 | |
| 332 | if (len <= aux_info.blocks_per_dind) |
| 333 | return ind; |
| 334 | |
| 335 | len -= aux_info.blocks_per_dind; |
| 336 | |
| 337 | ind += DIV_ROUND_UP(len, aux_info.blocks_per_tind); |
| 338 | |
| 339 | if (len <= aux_info.blocks_per_tind) |
| 340 | return ind; |
| 341 | |
| 342 | critical_error("request too large"); |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | static int do_inode_attach_indirect(struct ext4_inode *inode, |
| 347 | struct block_allocation *alloc, u32 block_len) |
| 348 | { |
| 349 | u32 count = block_len; |
| 350 | |
| 351 | if (inode_attach_direct_blocks(inode, alloc, &count)) { |
| 352 | error("failed to attach direct blocks to inode"); |
| 353 | return -1; |
| 354 | } |
| 355 | |
| 356 | if (count > 0) { |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 357 | if (inode_attach_indirect_blocks(inode, alloc, &count)) { |
| 358 | error("failed to attach indirect blocks to inode"); |
| 359 | return -1; |
| 360 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 361 | } |
| 362 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 363 | if (count > 0) { |
| 364 | if (inode_attach_dindirect_blocks(inode, alloc, &count)) { |
| 365 | error("failed to attach dindirect blocks to inode"); |
| 366 | return -1; |
| 367 | } |
| 368 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 369 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 370 | if (count > 0) { |
| 371 | if (inode_attach_tindirect_blocks(inode, alloc, &count)) { |
| 372 | error("failed to attach tindirect blocks to inode"); |
| 373 | return -1; |
| 374 | } |
| 375 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 376 | |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 377 | if (count) { |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 378 | error("blocks left after triply-indirect allocation"); |
| 379 | return -1; |
Colin Cross | 8aef66d | 2010-06-20 23:22:12 -0700 | [diff] [blame] | 380 | } |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 381 | |
| 382 | rewind_alloc(alloc); |
| 383 | |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | static struct block_allocation *do_inode_allocate_indirect( |
Nick Kralevich | 5446bde | 2013-02-19 19:05:47 -0800 | [diff] [blame] | 388 | u32 block_len) |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 389 | { |
| 390 | u32 indirect_len = indirect_blocks_needed(block_len); |
| 391 | |
| 392 | struct block_allocation *alloc = allocate_blocks(block_len + indirect_len); |
| 393 | |
| 394 | if (alloc == NULL) { |
| 395 | error("Failed to allocate %d blocks", block_len + indirect_len); |
| 396 | return NULL; |
| 397 | } |
| 398 | |
| 399 | return alloc; |
| 400 | } |
| 401 | |
| 402 | /* Allocates enough blocks to hold len bytes and connects them to an inode */ |
| 403 | void inode_allocate_indirect(struct ext4_inode *inode, unsigned long len) |
| 404 | { |
| 405 | struct block_allocation *alloc; |
| 406 | u32 block_len = DIV_ROUND_UP(len, info.block_size); |
| 407 | u32 indirect_len = indirect_blocks_needed(block_len); |
| 408 | |
Nick Kralevich | 5446bde | 2013-02-19 19:05:47 -0800 | [diff] [blame] | 409 | alloc = do_inode_allocate_indirect(block_len); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 410 | if (alloc == NULL) { |
| 411 | error("failed to allocate extents for %lu bytes", len); |
| 412 | return; |
| 413 | } |
| 414 | |
| 415 | reserve_all_indirect_blocks(alloc, block_len); |
| 416 | rewind_alloc(alloc); |
| 417 | |
| 418 | if (do_inode_attach_indirect(inode, alloc, block_len)) |
| 419 | error("failed to attach blocks to indirect inode"); |
| 420 | |
| 421 | inode->i_flags = 0; |
| 422 | inode->i_blocks_lo = (block_len + indirect_len) * info.block_size / 512; |
| 423 | inode->i_size_lo = len; |
| 424 | |
| 425 | free_alloc(alloc); |
| 426 | } |
| 427 | |
| 428 | void inode_attach_resize(struct ext4_inode *inode, |
| 429 | struct block_allocation *alloc) |
| 430 | { |
| 431 | u32 block_len = block_allocation_len(alloc); |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 432 | u32 superblocks = block_len / info.bg_desc_reserve_blocks; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 433 | u32 i, j; |
| 434 | u64 blocks; |
| 435 | u64 size; |
| 436 | |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 437 | if (block_len % info.bg_desc_reserve_blocks) |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 438 | critical_error("reserved blocks not a multiple of %d", |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 439 | info.bg_desc_reserve_blocks); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 440 | |
| 441 | append_oob_allocation(alloc, 1); |
| 442 | u32 dind_block = get_oob_block(alloc, 0); |
| 443 | |
| 444 | u32 *dind_block_data = calloc(info.block_size, 1); |
| 445 | if (!dind_block_data) |
| 446 | critical_error_errno("calloc"); |
Colin Cross | 782879a | 2014-01-23 13:08:16 -0800 | [diff] [blame] | 447 | sparse_file_add_data(ext4_sparse_file, dind_block_data, info.block_size, |
Colin Cross | f0ee37f | 2012-04-24 17:48:43 -0700 | [diff] [blame] | 448 | dind_block); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 449 | |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 450 | u32 *ind_block_data = calloc(info.block_size, info.bg_desc_reserve_blocks); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 451 | if (!ind_block_data) |
| 452 | critical_error_errno("calloc"); |
Colin Cross | 782879a | 2014-01-23 13:08:16 -0800 | [diff] [blame] | 453 | sparse_file_add_data(ext4_sparse_file, ind_block_data, |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 454 | info.block_size * info.bg_desc_reserve_blocks, |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 455 | get_block(alloc, 0)); |
| 456 | |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 457 | for (i = 0; i < info.bg_desc_reserve_blocks; i++) { |
| 458 | int r = (i - aux_info.bg_desc_blocks) % info.bg_desc_reserve_blocks; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 459 | if (r < 0) |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 460 | r += info.bg_desc_reserve_blocks; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 461 | |
| 462 | dind_block_data[i] = get_block(alloc, r); |
| 463 | |
| 464 | for (j = 1; j < superblocks; j++) { |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 465 | u32 b = j * info.bg_desc_reserve_blocks + r; |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 466 | ind_block_data[r * aux_info.blocks_per_ind + j - 1] = get_block(alloc, b); |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | u32 last_block = EXT4_NDIR_BLOCKS + aux_info.blocks_per_ind + |
Colin Cross | 22742ce | 2010-12-22 16:01:52 -0800 | [diff] [blame] | 471 | aux_info.blocks_per_ind * (info.bg_desc_reserve_blocks - 1) + |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 472 | superblocks - 2; |
| 473 | |
| 474 | blocks = ((u64)block_len + 1) * info.block_size / 512; |
| 475 | size = (u64)last_block * info.block_size; |
| 476 | |
| 477 | inode->i_block[EXT4_DIND_BLOCK] = dind_block; |
| 478 | inode->i_flags = 0; |
| 479 | inode->i_blocks_lo = blocks; |
| 480 | inode->osd2.linux2.l_i_blocks_high = blocks >> 32; |
| 481 | inode->i_size_lo = size; |
| 482 | inode->i_size_high = size >> 32; |
| 483 | } |
| 484 | |
| 485 | /* Allocates enough blocks to hold len bytes, with backing_len bytes in a data |
| 486 | buffer, and connects them to an inode. Returns a pointer to the data |
| 487 | buffer. */ |
| 488 | u8 *inode_allocate_data_indirect(struct ext4_inode *inode, unsigned long len, |
| 489 | unsigned long backing_len) |
| 490 | { |
| 491 | struct block_allocation *alloc; |
Johan Rudholm | 82c18e0 | 2012-02-06 15:17:04 +0100 | [diff] [blame] | 492 | u32 block_len = DIV_ROUND_UP(len, info.block_size); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 493 | u8 *data = NULL; |
| 494 | |
Nick Kralevich | 5446bde | 2013-02-19 19:05:47 -0800 | [diff] [blame] | 495 | alloc = do_inode_allocate_indirect(block_len); |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 496 | if (alloc == NULL) { |
| 497 | error("failed to allocate extents for %lu bytes", len); |
| 498 | return NULL; |
| 499 | } |
| 500 | |
| 501 | if (backing_len) { |
| 502 | data = create_backing(alloc, backing_len); |
| 503 | if (!data) |
| 504 | error("failed to create backing for %lu bytes", backing_len); |
| 505 | } |
| 506 | |
Johan Rudholm | 82c18e0 | 2012-02-06 15:17:04 +0100 | [diff] [blame] | 507 | rewind_alloc(alloc); |
| 508 | if (do_inode_attach_indirect(inode, alloc, block_len)) |
| 509 | error("failed to attach blocks to indirect inode"); |
| 510 | |
Colin Cross | ec0a2e8 | 2010-06-11 14:21:37 -0700 | [diff] [blame] | 511 | free_alloc(alloc); |
| 512 | |
| 513 | return data; |
| 514 | } |