| 1 | // SPDX-License-Identifier: LGPL-2.1 |
| 2 | /* |
| 3 | * Copyright IBM Corporation, 2007 |
| 4 | * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <linux/slab.h> |
| 9 | #include "ext4_jbd2.h" |
| 10 | #include "ext4_extents.h" |
| 11 | |
| 12 | /* |
| 13 | * The contiguous blocks details which can be |
| 14 | * represented by a single extent |
| 15 | */ |
| 16 | struct migrate_struct { |
| 17 | ext4_lblk_t first_block, last_block, curr_block; |
| 18 | ext4_fsblk_t first_pblock, last_pblock; |
| 19 | }; |
| 20 | |
| 21 | static int finish_range(handle_t *handle, struct inode *inode, |
| 22 | struct migrate_struct *lb) |
| 23 | |
| 24 | { |
| 25 | int retval = 0, needed; |
| 26 | struct ext4_extent newext; |
| 27 | struct ext4_ext_path *path; |
| 28 | if (lb->first_pblock == 0) |
| 29 | return 0; |
| 30 | |
| 31 | /* Add the extent to temp inode*/ |
| 32 | newext.ee_block = cpu_to_le32(lb->first_block); |
| 33 | newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1); |
| 34 | ext4_ext_store_pblock(&newext, lb->first_pblock); |
| 35 | /* Locking only for convenience since we are operating on temp inode */ |
| 36 | down_write(&EXT4_I(inode)->i_data_sem); |
| 37 | path = ext4_find_extent(inode, lb->first_block, NULL, 0); |
| 38 | if (IS_ERR(path)) { |
| 39 | retval = PTR_ERR(path); |
| 40 | goto err_out; |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * Calculate the credit needed to inserting this extent |
| 45 | * Since we are doing this in loop we may accumulate extra |
| 46 | * credit. But below we try to not accumulate too much |
| 47 | * of them by restarting the journal. |
| 48 | */ |
| 49 | needed = ext4_ext_calc_credits_for_single_extent(inode, |
| 50 | lb->last_block - lb->first_block + 1, path); |
| 51 | |
| 52 | retval = ext4_datasem_ensure_credits(handle, inode, needed, needed, 0); |
| 53 | if (retval < 0) |
| 54 | goto err_out; |
| 55 | path = ext4_ext_insert_extent(handle, inode, path, &newext, 0); |
| 56 | if (IS_ERR(path)) |
| 57 | retval = PTR_ERR(path); |
| 58 | err_out: |
| 59 | up_write((&EXT4_I(inode)->i_data_sem)); |
| 60 | ext4_free_ext_path(path); |
| 61 | lb->first_pblock = 0; |
| 62 | return retval; |
| 63 | } |
| 64 | |
| 65 | static int update_extent_range(handle_t *handle, struct inode *inode, |
| 66 | ext4_fsblk_t pblock, struct migrate_struct *lb) |
| 67 | { |
| 68 | int retval; |
| 69 | /* |
| 70 | * See if we can add on to the existing range (if it exists) |
| 71 | */ |
| 72 | if (lb->first_pblock && |
| 73 | (lb->last_pblock+1 == pblock) && |
| 74 | (lb->last_block+1 == lb->curr_block)) { |
| 75 | lb->last_pblock = pblock; |
| 76 | lb->last_block = lb->curr_block; |
| 77 | lb->curr_block++; |
| 78 | return 0; |
| 79 | } |
| 80 | /* |
| 81 | * Start a new range. |
| 82 | */ |
| 83 | retval = finish_range(handle, inode, lb); |
| 84 | lb->first_pblock = lb->last_pblock = pblock; |
| 85 | lb->first_block = lb->last_block = lb->curr_block; |
| 86 | lb->curr_block++; |
| 87 | return retval; |
| 88 | } |
| 89 | |
| 90 | static int update_ind_extent_range(handle_t *handle, struct inode *inode, |
| 91 | ext4_fsblk_t pblock, |
| 92 | struct migrate_struct *lb) |
| 93 | { |
| 94 | struct buffer_head *bh; |
| 95 | __le32 *i_data; |
| 96 | int i, retval = 0; |
| 97 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
| 98 | |
| 99 | bh = ext4_sb_bread(inode->i_sb, pblock, 0); |
| 100 | if (IS_ERR(bh)) |
| 101 | return PTR_ERR(bh); |
| 102 | |
| 103 | i_data = (__le32 *)bh->b_data; |
| 104 | for (i = 0; i < max_entries; i++) { |
| 105 | if (i_data[i]) { |
| 106 | retval = update_extent_range(handle, inode, |
| 107 | le32_to_cpu(i_data[i]), lb); |
| 108 | if (retval) |
| 109 | break; |
| 110 | } else { |
| 111 | lb->curr_block++; |
| 112 | } |
| 113 | } |
| 114 | put_bh(bh); |
| 115 | return retval; |
| 116 | |
| 117 | } |
| 118 | |
| 119 | static int update_dind_extent_range(handle_t *handle, struct inode *inode, |
| 120 | ext4_fsblk_t pblock, |
| 121 | struct migrate_struct *lb) |
| 122 | { |
| 123 | struct buffer_head *bh; |
| 124 | __le32 *i_data; |
| 125 | int i, retval = 0; |
| 126 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
| 127 | |
| 128 | bh = ext4_sb_bread(inode->i_sb, pblock, 0); |
| 129 | if (IS_ERR(bh)) |
| 130 | return PTR_ERR(bh); |
| 131 | |
| 132 | i_data = (__le32 *)bh->b_data; |
| 133 | for (i = 0; i < max_entries; i++) { |
| 134 | if (i_data[i]) { |
| 135 | retval = update_ind_extent_range(handle, inode, |
| 136 | le32_to_cpu(i_data[i]), lb); |
| 137 | if (retval) |
| 138 | break; |
| 139 | } else { |
| 140 | /* Only update the file block number */ |
| 141 | lb->curr_block += max_entries; |
| 142 | } |
| 143 | } |
| 144 | put_bh(bh); |
| 145 | return retval; |
| 146 | |
| 147 | } |
| 148 | |
| 149 | static int update_tind_extent_range(handle_t *handle, struct inode *inode, |
| 150 | ext4_fsblk_t pblock, |
| 151 | struct migrate_struct *lb) |
| 152 | { |
| 153 | struct buffer_head *bh; |
| 154 | __le32 *i_data; |
| 155 | int i, retval = 0; |
| 156 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
| 157 | |
| 158 | bh = ext4_sb_bread(inode->i_sb, pblock, 0); |
| 159 | if (IS_ERR(bh)) |
| 160 | return PTR_ERR(bh); |
| 161 | |
| 162 | i_data = (__le32 *)bh->b_data; |
| 163 | for (i = 0; i < max_entries; i++) { |
| 164 | if (i_data[i]) { |
| 165 | retval = update_dind_extent_range(handle, inode, |
| 166 | le32_to_cpu(i_data[i]), lb); |
| 167 | if (retval) |
| 168 | break; |
| 169 | } else { |
| 170 | /* Only update the file block number */ |
| 171 | lb->curr_block += max_entries * max_entries; |
| 172 | } |
| 173 | } |
| 174 | put_bh(bh); |
| 175 | return retval; |
| 176 | |
| 177 | } |
| 178 | |
| 179 | static int free_dind_blocks(handle_t *handle, |
| 180 | struct inode *inode, __le32 i_data) |
| 181 | { |
| 182 | int i; |
| 183 | __le32 *tmp_idata; |
| 184 | struct buffer_head *bh; |
| 185 | struct super_block *sb = inode->i_sb; |
| 186 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
| 187 | int err; |
| 188 | |
| 189 | bh = ext4_sb_bread(sb, le32_to_cpu(i_data), 0); |
| 190 | if (IS_ERR(bh)) |
| 191 | return PTR_ERR(bh); |
| 192 | |
| 193 | tmp_idata = (__le32 *)bh->b_data; |
| 194 | for (i = 0; i < max_entries; i++) { |
| 195 | if (tmp_idata[i]) { |
| 196 | err = ext4_journal_ensure_credits(handle, |
| 197 | EXT4_RESERVE_TRANS_BLOCKS, |
| 198 | ext4_free_metadata_revoke_credits(sb, 1)); |
| 199 | if (err < 0) { |
| 200 | put_bh(bh); |
| 201 | return err; |
| 202 | } |
| 203 | ext4_free_blocks(handle, inode, NULL, |
| 204 | le32_to_cpu(tmp_idata[i]), 1, |
| 205 | EXT4_FREE_BLOCKS_METADATA | |
| 206 | EXT4_FREE_BLOCKS_FORGET); |
| 207 | } |
| 208 | } |
| 209 | put_bh(bh); |
| 210 | err = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS, |
| 211 | ext4_free_metadata_revoke_credits(sb, 1)); |
| 212 | if (err < 0) |
| 213 | return err; |
| 214 | ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
| 215 | EXT4_FREE_BLOCKS_METADATA | |
| 216 | EXT4_FREE_BLOCKS_FORGET); |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static int free_tind_blocks(handle_t *handle, |
| 221 | struct inode *inode, __le32 i_data) |
| 222 | { |
| 223 | int i, retval = 0; |
| 224 | __le32 *tmp_idata; |
| 225 | struct buffer_head *bh; |
| 226 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
| 227 | |
| 228 | bh = ext4_sb_bread(inode->i_sb, le32_to_cpu(i_data), 0); |
| 229 | if (IS_ERR(bh)) |
| 230 | return PTR_ERR(bh); |
| 231 | |
| 232 | tmp_idata = (__le32 *)bh->b_data; |
| 233 | for (i = 0; i < max_entries; i++) { |
| 234 | if (tmp_idata[i]) { |
| 235 | retval = free_dind_blocks(handle, |
| 236 | inode, tmp_idata[i]); |
| 237 | if (retval) { |
| 238 | put_bh(bh); |
| 239 | return retval; |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | put_bh(bh); |
| 244 | retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS, |
| 245 | ext4_free_metadata_revoke_credits(inode->i_sb, 1)); |
| 246 | if (retval < 0) |
| 247 | return retval; |
| 248 | ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
| 249 | EXT4_FREE_BLOCKS_METADATA | |
| 250 | EXT4_FREE_BLOCKS_FORGET); |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data) |
| 255 | { |
| 256 | int retval; |
| 257 | |
| 258 | /* ei->i_data[EXT4_IND_BLOCK] */ |
| 259 | if (i_data[0]) { |
| 260 | retval = ext4_journal_ensure_credits(handle, |
| 261 | EXT4_RESERVE_TRANS_BLOCKS, |
| 262 | ext4_free_metadata_revoke_credits(inode->i_sb, 1)); |
| 263 | if (retval < 0) |
| 264 | return retval; |
| 265 | ext4_free_blocks(handle, inode, NULL, |
| 266 | le32_to_cpu(i_data[0]), 1, |
| 267 | EXT4_FREE_BLOCKS_METADATA | |
| 268 | EXT4_FREE_BLOCKS_FORGET); |
| 269 | } |
| 270 | |
| 271 | /* ei->i_data[EXT4_DIND_BLOCK] */ |
| 272 | if (i_data[1]) { |
| 273 | retval = free_dind_blocks(handle, inode, i_data[1]); |
| 274 | if (retval) |
| 275 | return retval; |
| 276 | } |
| 277 | |
| 278 | /* ei->i_data[EXT4_TIND_BLOCK] */ |
| 279 | if (i_data[2]) { |
| 280 | retval = free_tind_blocks(handle, inode, i_data[2]); |
| 281 | if (retval) |
| 282 | return retval; |
| 283 | } |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode, |
| 288 | struct inode *tmp_inode) |
| 289 | { |
| 290 | int retval, retval2 = 0; |
| 291 | __le32 i_data[3]; |
| 292 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 293 | struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode); |
| 294 | |
| 295 | /* |
| 296 | * One credit accounted for writing the |
| 297 | * i_data field of the original inode |
| 298 | */ |
| 299 | retval = ext4_journal_ensure_credits(handle, 1, 0); |
| 300 | if (retval < 0) |
| 301 | goto err_out; |
| 302 | |
| 303 | i_data[0] = ei->i_data[EXT4_IND_BLOCK]; |
| 304 | i_data[1] = ei->i_data[EXT4_DIND_BLOCK]; |
| 305 | i_data[2] = ei->i_data[EXT4_TIND_BLOCK]; |
| 306 | |
| 307 | down_write(&EXT4_I(inode)->i_data_sem); |
| 308 | /* |
| 309 | * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation |
| 310 | * happened after we started the migrate. We need to |
| 311 | * fail the migrate |
| 312 | */ |
| 313 | if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) { |
| 314 | retval = -EAGAIN; |
| 315 | up_write(&EXT4_I(inode)->i_data_sem); |
| 316 | goto err_out; |
| 317 | } else |
| 318 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
| 319 | /* |
| 320 | * We have the extent map build with the tmp inode. |
| 321 | * Now copy the i_data across |
| 322 | */ |
| 323 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
| 324 | memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data)); |
| 325 | |
| 326 | /* |
| 327 | * Update i_blocks with the new blocks that got |
| 328 | * allocated while adding extents for extent index |
| 329 | * blocks. |
| 330 | * |
| 331 | * While converting to extents we need not |
| 332 | * update the original inode i_blocks for extent blocks |
| 333 | * via quota APIs. The quota update happened via tmp_inode already. |
| 334 | */ |
| 335 | spin_lock(&inode->i_lock); |
| 336 | inode->i_blocks += tmp_inode->i_blocks; |
| 337 | spin_unlock(&inode->i_lock); |
| 338 | up_write(&EXT4_I(inode)->i_data_sem); |
| 339 | |
| 340 | /* |
| 341 | * We mark the inode dirty after, because we decrement the |
| 342 | * i_blocks when freeing the indirect meta-data blocks |
| 343 | */ |
| 344 | retval = free_ind_block(handle, inode, i_data); |
| 345 | retval2 = ext4_mark_inode_dirty(handle, inode); |
| 346 | if (unlikely(retval2 && !retval)) |
| 347 | retval = retval2; |
| 348 | |
| 349 | err_out: |
| 350 | return retval; |
| 351 | } |
| 352 | |
| 353 | static int free_ext_idx(handle_t *handle, struct inode *inode, |
| 354 | struct ext4_extent_idx *ix) |
| 355 | { |
| 356 | int i, retval = 0; |
| 357 | ext4_fsblk_t block; |
| 358 | struct buffer_head *bh; |
| 359 | struct ext4_extent_header *eh; |
| 360 | |
| 361 | block = ext4_idx_pblock(ix); |
| 362 | bh = ext4_sb_bread(inode->i_sb, block, 0); |
| 363 | if (IS_ERR(bh)) |
| 364 | return PTR_ERR(bh); |
| 365 | |
| 366 | eh = (struct ext4_extent_header *)bh->b_data; |
| 367 | if (eh->eh_depth != 0) { |
| 368 | ix = EXT_FIRST_INDEX(eh); |
| 369 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { |
| 370 | retval = free_ext_idx(handle, inode, ix); |
| 371 | if (retval) { |
| 372 | put_bh(bh); |
| 373 | return retval; |
| 374 | } |
| 375 | } |
| 376 | } |
| 377 | put_bh(bh); |
| 378 | retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS, |
| 379 | ext4_free_metadata_revoke_credits(inode->i_sb, 1)); |
| 380 | if (retval < 0) |
| 381 | return retval; |
| 382 | ext4_free_blocks(handle, inode, NULL, block, 1, |
| 383 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Free the extent meta data blocks only |
| 389 | */ |
| 390 | static int free_ext_block(handle_t *handle, struct inode *inode) |
| 391 | { |
| 392 | int i, retval = 0; |
| 393 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 394 | struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data; |
| 395 | struct ext4_extent_idx *ix; |
| 396 | if (eh->eh_depth == 0) |
| 397 | /* |
| 398 | * No extra blocks allocated for extent meta data |
| 399 | */ |
| 400 | return 0; |
| 401 | ix = EXT_FIRST_INDEX(eh); |
| 402 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { |
| 403 | retval = free_ext_idx(handle, inode, ix); |
| 404 | if (retval) |
| 405 | return retval; |
| 406 | } |
| 407 | return retval; |
| 408 | } |
| 409 | |
| 410 | int ext4_ext_migrate(struct inode *inode) |
| 411 | { |
| 412 | handle_t *handle; |
| 413 | int retval = 0, i; |
| 414 | __le32 *i_data; |
| 415 | struct ext4_inode_info *ei; |
| 416 | struct inode *tmp_inode = NULL; |
| 417 | struct migrate_struct lb; |
| 418 | unsigned long max_entries; |
| 419 | __u32 goal, tmp_csum_seed; |
| 420 | uid_t owner[2]; |
| 421 | int alloc_ctx; |
| 422 | |
| 423 | /* |
| 424 | * If the filesystem does not support extents, or the inode |
| 425 | * already is extent-based, error out. |
| 426 | */ |
| 427 | if (!ext4_has_feature_extents(inode->i_sb) || |
| 428 | ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) || |
| 429 | ext4_has_inline_data(inode)) |
| 430 | return -EINVAL; |
| 431 | |
| 432 | if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0) |
| 433 | /* |
| 434 | * don't migrate fast symlink |
| 435 | */ |
| 436 | return retval; |
| 437 | |
| 438 | alloc_ctx = ext4_writepages_down_write(inode->i_sb); |
| 439 | |
| 440 | /* |
| 441 | * Worst case we can touch the allocation bitmaps and a block |
| 442 | * group descriptor block. We do need to worry about |
| 443 | * credits for modifying the quota inode. |
| 444 | */ |
| 445 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, |
| 446 | 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb)); |
| 447 | |
| 448 | if (IS_ERR(handle)) { |
| 449 | retval = PTR_ERR(handle); |
| 450 | goto out_unlock; |
| 451 | } |
| 452 | goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) * |
| 453 | EXT4_INODES_PER_GROUP(inode->i_sb)) + 1; |
| 454 | owner[0] = i_uid_read(inode); |
| 455 | owner[1] = i_gid_read(inode); |
| 456 | tmp_inode = ext4_new_inode(handle, d_inode(inode->i_sb->s_root), |
| 457 | S_IFREG, NULL, goal, owner, 0); |
| 458 | if (IS_ERR(tmp_inode)) { |
| 459 | retval = PTR_ERR(tmp_inode); |
| 460 | ext4_journal_stop(handle); |
| 461 | goto out_unlock; |
| 462 | } |
| 463 | /* |
| 464 | * Use the correct seed for checksum (i.e. the seed from 'inode'). This |
| 465 | * is so that the metadata blocks will have the correct checksum after |
| 466 | * the migration. |
| 467 | */ |
| 468 | ei = EXT4_I(inode); |
| 469 | tmp_csum_seed = EXT4_I(tmp_inode)->i_csum_seed; |
| 470 | EXT4_I(tmp_inode)->i_csum_seed = ei->i_csum_seed; |
| 471 | i_size_write(tmp_inode, i_size_read(inode)); |
| 472 | /* |
| 473 | * Set the i_nlink to zero so it will be deleted later |
| 474 | * when we drop inode reference. |
| 475 | */ |
| 476 | clear_nlink(tmp_inode); |
| 477 | |
| 478 | ext4_ext_tree_init(handle, tmp_inode); |
| 479 | ext4_journal_stop(handle); |
| 480 | |
| 481 | /* |
| 482 | * start with one credit accounted for |
| 483 | * superblock modification. |
| 484 | * |
| 485 | * For the tmp_inode we already have committed the |
| 486 | * transaction that created the inode. Later as and |
| 487 | * when we add extents we extent the journal |
| 488 | */ |
| 489 | /* |
| 490 | * Even though we take i_rwsem we can still cause block |
| 491 | * allocation via mmap write to holes. If we have allocated |
| 492 | * new blocks we fail migrate. New block allocation will |
| 493 | * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated |
| 494 | * with i_data_sem held to prevent racing with block |
| 495 | * allocation. |
| 496 | */ |
| 497 | down_read(&EXT4_I(inode)->i_data_sem); |
| 498 | ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
| 499 | up_read((&EXT4_I(inode)->i_data_sem)); |
| 500 | |
| 501 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1); |
| 502 | if (IS_ERR(handle)) { |
| 503 | retval = PTR_ERR(handle); |
| 504 | goto out_tmp_inode; |
| 505 | } |
| 506 | |
| 507 | i_data = ei->i_data; |
| 508 | memset(&lb, 0, sizeof(lb)); |
| 509 | |
| 510 | /* 32 bit block address 4 bytes */ |
| 511 | max_entries = inode->i_sb->s_blocksize >> 2; |
| 512 | for (i = 0; i < EXT4_NDIR_BLOCKS; i++) { |
| 513 | if (i_data[i]) { |
| 514 | retval = update_extent_range(handle, tmp_inode, |
| 515 | le32_to_cpu(i_data[i]), &lb); |
| 516 | if (retval) |
| 517 | goto err_out; |
| 518 | } else |
| 519 | lb.curr_block++; |
| 520 | } |
| 521 | if (i_data[EXT4_IND_BLOCK]) { |
| 522 | retval = update_ind_extent_range(handle, tmp_inode, |
| 523 | le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb); |
| 524 | if (retval) |
| 525 | goto err_out; |
| 526 | } else |
| 527 | lb.curr_block += max_entries; |
| 528 | if (i_data[EXT4_DIND_BLOCK]) { |
| 529 | retval = update_dind_extent_range(handle, tmp_inode, |
| 530 | le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb); |
| 531 | if (retval) |
| 532 | goto err_out; |
| 533 | } else |
| 534 | lb.curr_block += max_entries * max_entries; |
| 535 | if (i_data[EXT4_TIND_BLOCK]) { |
| 536 | retval = update_tind_extent_range(handle, tmp_inode, |
| 537 | le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb); |
| 538 | if (retval) |
| 539 | goto err_out; |
| 540 | } |
| 541 | /* |
| 542 | * Build the last extent |
| 543 | */ |
| 544 | retval = finish_range(handle, tmp_inode, &lb); |
| 545 | err_out: |
| 546 | if (retval) |
| 547 | /* |
| 548 | * Failure case delete the extent information with the |
| 549 | * tmp_inode |
| 550 | */ |
| 551 | free_ext_block(handle, tmp_inode); |
| 552 | else { |
| 553 | retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode); |
| 554 | if (retval) |
| 555 | /* |
| 556 | * if we fail to swap inode data free the extent |
| 557 | * details of the tmp inode |
| 558 | */ |
| 559 | free_ext_block(handle, tmp_inode); |
| 560 | } |
| 561 | |
| 562 | /* We mark the tmp_inode dirty via ext4_ext_tree_init. */ |
| 563 | retval = ext4_journal_ensure_credits(handle, 1, 0); |
| 564 | if (retval < 0) |
| 565 | goto out_stop; |
| 566 | /* |
| 567 | * Mark the tmp_inode as of size zero |
| 568 | */ |
| 569 | i_size_write(tmp_inode, 0); |
| 570 | |
| 571 | /* |
| 572 | * set the i_blocks count to zero |
| 573 | * so that the ext4_evict_inode() does the |
| 574 | * right job |
| 575 | * |
| 576 | * We don't need to take the i_lock because |
| 577 | * the inode is not visible to user space. |
| 578 | */ |
| 579 | tmp_inode->i_blocks = 0; |
| 580 | EXT4_I(tmp_inode)->i_csum_seed = tmp_csum_seed; |
| 581 | |
| 582 | /* Reset the extent details */ |
| 583 | ext4_ext_tree_init(handle, tmp_inode); |
| 584 | out_stop: |
| 585 | ext4_journal_stop(handle); |
| 586 | out_tmp_inode: |
| 587 | unlock_new_inode(tmp_inode); |
| 588 | iput(tmp_inode); |
| 589 | out_unlock: |
| 590 | ext4_writepages_up_write(inode->i_sb, alloc_ctx); |
| 591 | return retval; |
| 592 | } |
| 593 | |
| 594 | /* |
| 595 | * Migrate a simple extent-based inode to use the i_blocks[] array |
| 596 | */ |
| 597 | int ext4_ind_migrate(struct inode *inode) |
| 598 | { |
| 599 | struct ext4_extent_header *eh; |
| 600 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 601 | struct ext4_super_block *es = sbi->s_es; |
| 602 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 603 | struct ext4_extent *ex; |
| 604 | unsigned int i, len; |
| 605 | ext4_lblk_t start, end; |
| 606 | ext4_fsblk_t blk; |
| 607 | handle_t *handle; |
| 608 | int ret, ret2 = 0; |
| 609 | int alloc_ctx; |
| 610 | |
| 611 | if (!ext4_has_feature_extents(inode->i_sb) || |
| 612 | (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
| 613 | return -EINVAL; |
| 614 | |
| 615 | if (ext4_has_feature_bigalloc(inode->i_sb)) |
| 616 | return -EOPNOTSUPP; |
| 617 | |
| 618 | /* |
| 619 | * In order to get correct extent info, force all delayed allocation |
| 620 | * blocks to be allocated, otherwise delayed allocation blocks may not |
| 621 | * be reflected and bypass the checks on extent header. |
| 622 | */ |
| 623 | if (test_opt(inode->i_sb, DELALLOC)) |
| 624 | ext4_alloc_da_blocks(inode); |
| 625 | |
| 626 | alloc_ctx = ext4_writepages_down_write(inode->i_sb); |
| 627 | |
| 628 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1); |
| 629 | if (IS_ERR(handle)) { |
| 630 | ret = PTR_ERR(handle); |
| 631 | goto out_unlock; |
| 632 | } |
| 633 | |
| 634 | down_write(&EXT4_I(inode)->i_data_sem); |
| 635 | ret = ext4_ext_check_inode(inode); |
| 636 | if (ret) |
| 637 | goto errout; |
| 638 | |
| 639 | eh = ext_inode_hdr(inode); |
| 640 | ex = EXT_FIRST_EXTENT(eh); |
| 641 | if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS || |
| 642 | eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) { |
| 643 | ret = -EOPNOTSUPP; |
| 644 | goto errout; |
| 645 | } |
| 646 | if (eh->eh_entries == 0) |
| 647 | blk = len = start = end = 0; |
| 648 | else { |
| 649 | len = le16_to_cpu(ex->ee_len); |
| 650 | blk = ext4_ext_pblock(ex); |
| 651 | start = le32_to_cpu(ex->ee_block); |
| 652 | end = start + len - 1; |
| 653 | if (end >= EXT4_NDIR_BLOCKS) { |
| 654 | ret = -EOPNOTSUPP; |
| 655 | goto errout; |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
| 660 | memset(ei->i_data, 0, sizeof(ei->i_data)); |
| 661 | for (i = start; i <= end; i++) |
| 662 | ei->i_data[i] = cpu_to_le32(blk++); |
| 663 | ret2 = ext4_mark_inode_dirty(handle, inode); |
| 664 | if (unlikely(ret2 && !ret)) |
| 665 | ret = ret2; |
| 666 | errout: |
| 667 | up_write(&EXT4_I(inode)->i_data_sem); |
| 668 | ext4_journal_stop(handle); |
| 669 | out_unlock: |
| 670 | ext4_writepages_up_write(inode->i_sb, alloc_ctx); |
| 671 | return ret; |
| 672 | } |