1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * resize.c 5 * 6 * volume resize. 7 * Inspired by ext3/resize.c. 8 * 9 * Copyright (C) 2007 Oracle. All rights reserved. 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public 13 * License as published by the Free Software Foundation; either 14 * version 2 of the License, or (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public 22 * License along with this program; if not, write to the 23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 24 * Boston, MA 021110-1307, USA. 25 */ 26 27 #include <linux/fs.h> 28 #include <linux/types.h> 29 30 #include <cluster/masklog.h> 31 32 #include "ocfs2.h" 33 34 #include "alloc.h" 35 #include "dlmglue.h" 36 #include "inode.h" 37 #include "journal.h" 38 #include "super.h" 39 #include "sysfile.h" 40 #include "uptodate.h" 41 #include "ocfs2_trace.h" 42 43 #include "buffer_head_io.h" 44 #include "suballoc.h" 45 #include "resize.h" 46 47 /* 48 * Check whether there are new backup superblocks exist 49 * in the last group. If there are some, mark them or clear 50 * them in the bitmap. 51 * 52 * Return how many backups we find in the last group. 53 */ 54 static u16 ocfs2_calc_new_backup_super(struct inode *inode, 55 struct ocfs2_group_desc *gd, 56 int new_clusters, 57 u32 first_new_cluster, 58 u16 cl_cpg, 59 int set) 60 { 61 int i; 62 u16 backups = 0; 63 u32 cluster; 64 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno); 65 66 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { 67 blkno = ocfs2_backup_super_blkno(inode->i_sb, i); 68 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno); 69 70 gd_blkno = ocfs2_which_cluster_group(inode, cluster); 71 if (gd_blkno < lgd_blkno) 72 continue; 73 else if (gd_blkno > lgd_blkno) 74 break; 75 76 if (set) 77 ocfs2_set_bit(cluster % cl_cpg, 78 (unsigned long *)gd->bg_bitmap); 79 else 80 ocfs2_clear_bit(cluster % cl_cpg, 81 (unsigned long *)gd->bg_bitmap); 82 backups++; 83 } 84 85 return backups; 86 } 87 88 static int ocfs2_update_last_group_and_inode(handle_t *handle, 89 struct inode *bm_inode, 90 struct buffer_head *bm_bh, 91 struct buffer_head *group_bh, 92 u32 first_new_cluster, 93 int new_clusters) 94 { 95 int ret = 0; 96 struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb); 97 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data; 98 struct ocfs2_chain_list *cl = &fe->id2.i_chain; 99 struct ocfs2_chain_rec *cr; 100 struct ocfs2_group_desc *group; 101 u16 chain, num_bits, backups = 0; 102 u16 cl_bpc = le16_to_cpu(cl->cl_bpc); 103 u16 cl_cpg = le16_to_cpu(cl->cl_cpg); 104 105 trace_ocfs2_update_last_group_and_inode(new_clusters, 106 first_new_cluster); 107 108 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode), 109 group_bh, OCFS2_JOURNAL_ACCESS_WRITE); 110 if (ret < 0) { 111 mlog_errno(ret); 112 goto out; 113 } 114 115 group = (struct ocfs2_group_desc *)group_bh->b_data; 116 117 /* update the group first. */ 118 num_bits = new_clusters * cl_bpc; 119 le16_add_cpu(&group->bg_bits, num_bits); 120 le16_add_cpu(&group->bg_free_bits_count, num_bits); 121 122 /* 123 * check whether there are some new backup superblocks exist in 124 * this group and update the group bitmap accordingly. 125 */ 126 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, 127 OCFS2_FEATURE_COMPAT_BACKUP_SB)) { 128 backups = ocfs2_calc_new_backup_super(bm_inode, 129 group, 130 new_clusters, 131 first_new_cluster, 132 cl_cpg, 1); 133 le16_add_cpu(&group->bg_free_bits_count, -1 * backups); 134 } 135 136 ocfs2_journal_dirty(handle, group_bh); 137 138 /* update the inode accordingly. */ 139 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh, 140 OCFS2_JOURNAL_ACCESS_WRITE); 141 if (ret < 0) { 142 mlog_errno(ret); 143 goto out_rollback; 144 } 145 146 chain = le16_to_cpu(group->bg_chain); 147 cr = (&cl->cl_recs[chain]); 148 le32_add_cpu(&cr->c_total, num_bits); 149 le32_add_cpu(&cr->c_free, num_bits); 150 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits); 151 le32_add_cpu(&fe->i_clusters, new_clusters); 152 153 if (backups) { 154 le32_add_cpu(&cr->c_free, -1 * backups); 155 le32_add_cpu(&fe->id1.bitmap1.i_used, backups); 156 } 157 158 spin_lock(&OCFS2_I(bm_inode)->ip_lock); 159 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); 160 le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits); 161 spin_unlock(&OCFS2_I(bm_inode)->ip_lock); 162 i_size_write(bm_inode, le64_to_cpu(fe->i_size)); 163 164 ocfs2_journal_dirty(handle, bm_bh); 165 166 out_rollback: 167 if (ret < 0) { 168 ocfs2_calc_new_backup_super(bm_inode, 169 group, 170 new_clusters, 171 first_new_cluster, 172 cl_cpg, 0); 173 le16_add_cpu(&group->bg_free_bits_count, backups); 174 le16_add_cpu(&group->bg_bits, -1 * num_bits); 175 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits); 176 } 177 out: 178 if (ret) 179 mlog_errno(ret); 180 return ret; 181 } 182 183 static int update_backups(struct inode * inode, u32 clusters, char *data) 184 { 185 int i, ret = 0; 186 u32 cluster; 187 u64 blkno; 188 struct buffer_head *backup = NULL; 189 struct ocfs2_dinode *backup_di = NULL; 190 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 191 192 /* calculate the real backups we need to update. */ 193 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { 194 blkno = ocfs2_backup_super_blkno(inode->i_sb, i); 195 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno); 196 if (cluster > clusters) 197 break; 198 199 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup); 200 if (ret < 0) { 201 mlog_errno(ret); 202 break; 203 } 204 205 memcpy(backup->b_data, data, inode->i_sb->s_blocksize); 206 207 backup_di = (struct ocfs2_dinode *)backup->b_data; 208 backup_di->i_blkno = cpu_to_le64(blkno); 209 210 ret = ocfs2_write_super_or_backup(osb, backup); 211 brelse(backup); 212 backup = NULL; 213 if (ret < 0) { 214 mlog_errno(ret); 215 break; 216 } 217 } 218 219 return ret; 220 } 221 222 static void ocfs2_update_super_and_backups(struct inode *inode, 223 int new_clusters) 224 { 225 int ret; 226 u32 clusters = 0; 227 struct buffer_head *super_bh = NULL; 228 struct ocfs2_dinode *super_di = NULL; 229 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 230 231 /* 232 * update the superblock last. 233 * It doesn't matter if the write failed. 234 */ 235 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1, 236 &super_bh); 237 if (ret < 0) { 238 mlog_errno(ret); 239 goto out; 240 } 241 242 super_di = (struct ocfs2_dinode *)super_bh->b_data; 243 le32_add_cpu(&super_di->i_clusters, new_clusters); 244 clusters = le32_to_cpu(super_di->i_clusters); 245 246 ret = ocfs2_write_super_or_backup(osb, super_bh); 247 if (ret < 0) { 248 mlog_errno(ret); 249 goto out; 250 } 251 252 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB)) 253 ret = update_backups(inode, clusters, super_bh->b_data); 254 255 out: 256 brelse(super_bh); 257 if (ret) 258 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s" 259 " during fs resize. This condition is not fatal," 260 " but fsck.ocfs2 should be run to fix it\n", 261 osb->dev_str); 262 return; 263 } 264 265 /* 266 * Extend the filesystem to the new number of clusters specified. This entry 267 * point is only used to extend the current filesystem to the end of the last 268 * existing group. 269 */ 270 int ocfs2_group_extend(struct inode * inode, int new_clusters) 271 { 272 int ret; 273 handle_t *handle; 274 struct buffer_head *main_bm_bh = NULL; 275 struct buffer_head *group_bh = NULL; 276 struct inode *main_bm_inode = NULL; 277 struct ocfs2_dinode *fe = NULL; 278 struct ocfs2_group_desc *group = NULL; 279 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 280 u16 cl_bpc; 281 u32 first_new_cluster; 282 u64 lgd_blkno; 283 284 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) 285 return -EROFS; 286 287 if (new_clusters < 0) 288 return -EINVAL; 289 else if (new_clusters == 0) 290 return 0; 291 292 main_bm_inode = ocfs2_get_system_file_inode(osb, 293 GLOBAL_BITMAP_SYSTEM_INODE, 294 OCFS2_INVALID_SLOT); 295 if (!main_bm_inode) { 296 ret = -EINVAL; 297 mlog_errno(ret); 298 goto out; 299 } 300 301 mutex_lock(&main_bm_inode->i_mutex); 302 303 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); 304 if (ret < 0) { 305 mlog_errno(ret); 306 goto out_mutex; 307 } 308 309 fe = (struct ocfs2_dinode *)main_bm_bh->b_data; 310 311 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(), 312 * so any corruption is a code bug. */ 313 BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); 314 315 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != 316 ocfs2_group_bitmap_size(osb->sb, 0, 317 osb->s_feature_incompat) * 8) { 318 mlog(ML_ERROR, "The disk is too old and small. " 319 "Force to do offline resize."); 320 ret = -EINVAL; 321 goto out_unlock; 322 } 323 324 first_new_cluster = le32_to_cpu(fe->i_clusters); 325 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode, 326 first_new_cluster - 1); 327 328 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno, 329 &group_bh); 330 if (ret < 0) { 331 mlog_errno(ret); 332 goto out_unlock; 333 } 334 group = (struct ocfs2_group_desc *)group_bh->b_data; 335 336 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); 337 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters > 338 le16_to_cpu(fe->id2.i_chain.cl_cpg)) { 339 ret = -EINVAL; 340 goto out_unlock; 341 } 342 343 344 trace_ocfs2_group_extend( 345 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters); 346 347 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS); 348 if (IS_ERR(handle)) { 349 mlog_errno(PTR_ERR(handle)); 350 ret = -EINVAL; 351 goto out_unlock; 352 } 353 354 /* update the last group descriptor and inode. */ 355 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode, 356 main_bm_bh, group_bh, 357 first_new_cluster, 358 new_clusters); 359 if (ret) { 360 mlog_errno(ret); 361 goto out_commit; 362 } 363 364 ocfs2_update_super_and_backups(main_bm_inode, new_clusters); 365 366 out_commit: 367 ocfs2_commit_trans(osb, handle); 368 out_unlock: 369 brelse(group_bh); 370 brelse(main_bm_bh); 371 372 ocfs2_inode_unlock(main_bm_inode, 1); 373 374 out_mutex: 375 mutex_unlock(&main_bm_inode->i_mutex); 376 iput(main_bm_inode); 377 378 out: 379 return ret; 380 } 381 382 static int ocfs2_check_new_group(struct inode *inode, 383 struct ocfs2_dinode *di, 384 struct ocfs2_new_group_input *input, 385 struct buffer_head *group_bh) 386 { 387 int ret; 388 struct ocfs2_group_desc *gd = 389 (struct ocfs2_group_desc *)group_bh->b_data; 390 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc); 391 392 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh); 393 if (ret) 394 goto out; 395 396 ret = -EINVAL; 397 if (le16_to_cpu(gd->bg_chain) != input->chain) 398 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u " 399 "while input has %u set.\n", 400 (unsigned long long)le64_to_cpu(gd->bg_blkno), 401 le16_to_cpu(gd->bg_chain), input->chain); 402 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc) 403 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but " 404 "input has %u clusters set\n", 405 (unsigned long long)le64_to_cpu(gd->bg_blkno), 406 le16_to_cpu(gd->bg_bits), input->clusters); 407 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc) 408 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u " 409 "but it should have %u set\n", 410 (unsigned long long)le64_to_cpu(gd->bg_blkno), 411 le16_to_cpu(gd->bg_bits), 412 input->frees * cl_bpc); 413 else 414 ret = 0; 415 416 out: 417 return ret; 418 } 419 420 static int ocfs2_verify_group_and_input(struct inode *inode, 421 struct ocfs2_dinode *di, 422 struct ocfs2_new_group_input *input, 423 struct buffer_head *group_bh) 424 { 425 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count); 426 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg); 427 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec); 428 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group); 429 u32 total_clusters = le32_to_cpu(di->i_clusters); 430 int ret = -EINVAL; 431 432 if (cluster < total_clusters) 433 mlog(ML_ERROR, "add a group which is in the current volume.\n"); 434 else if (input->chain >= cl_count) 435 mlog(ML_ERROR, "input chain exceeds the limit.\n"); 436 else if (next_free != cl_count && next_free != input->chain) 437 mlog(ML_ERROR, 438 "the add group should be in chain %u\n", next_free); 439 else if (total_clusters + input->clusters < total_clusters) 440 mlog(ML_ERROR, "add group's clusters overflow.\n"); 441 else if (input->clusters > cl_cpg) 442 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n"); 443 else if (input->frees > input->clusters) 444 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n"); 445 else if (total_clusters % cl_cpg != 0) 446 mlog(ML_ERROR, 447 "the last group isn't full. Use group extend first.\n"); 448 else if (input->group != ocfs2_which_cluster_group(inode, cluster)) 449 mlog(ML_ERROR, "group blkno is invalid\n"); 450 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh))) 451 mlog(ML_ERROR, "group descriptor check failed.\n"); 452 else 453 ret = 0; 454 455 return ret; 456 } 457 458 /* Add a new group descriptor to global_bitmap. */ 459 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input) 460 { 461 int ret; 462 handle_t *handle; 463 struct buffer_head *main_bm_bh = NULL; 464 struct inode *main_bm_inode = NULL; 465 struct ocfs2_dinode *fe = NULL; 466 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 467 struct buffer_head *group_bh = NULL; 468 struct ocfs2_group_desc *group = NULL; 469 struct ocfs2_chain_list *cl; 470 struct ocfs2_chain_rec *cr; 471 u16 cl_bpc; 472 u64 bg_ptr; 473 474 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) 475 return -EROFS; 476 477 main_bm_inode = ocfs2_get_system_file_inode(osb, 478 GLOBAL_BITMAP_SYSTEM_INODE, 479 OCFS2_INVALID_SLOT); 480 if (!main_bm_inode) { 481 ret = -EINVAL; 482 mlog_errno(ret); 483 goto out; 484 } 485 486 mutex_lock(&main_bm_inode->i_mutex); 487 488 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); 489 if (ret < 0) { 490 mlog_errno(ret); 491 goto out_mutex; 492 } 493 494 fe = (struct ocfs2_dinode *)main_bm_bh->b_data; 495 496 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != 497 ocfs2_group_bitmap_size(osb->sb, 0, 498 osb->s_feature_incompat) * 8) { 499 mlog(ML_ERROR, "The disk is too old and small." 500 " Force to do offline resize."); 501 ret = -EINVAL; 502 goto out_unlock; 503 } 504 505 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh); 506 if (ret < 0) { 507 mlog(ML_ERROR, "Can't read the group descriptor # %llu " 508 "from the device.", (unsigned long long)input->group); 509 goto out_unlock; 510 } 511 512 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh); 513 514 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh); 515 if (ret) { 516 mlog_errno(ret); 517 goto out_free_group_bh; 518 } 519 520 trace_ocfs2_group_add((unsigned long long)input->group, 521 input->chain, input->clusters, input->frees); 522 523 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS); 524 if (IS_ERR(handle)) { 525 mlog_errno(PTR_ERR(handle)); 526 ret = -EINVAL; 527 goto out_free_group_bh; 528 } 529 530 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); 531 cl = &fe->id2.i_chain; 532 cr = &cl->cl_recs[input->chain]; 533 534 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode), 535 group_bh, OCFS2_JOURNAL_ACCESS_WRITE); 536 if (ret < 0) { 537 mlog_errno(ret); 538 goto out_commit; 539 } 540 541 group = (struct ocfs2_group_desc *)group_bh->b_data; 542 bg_ptr = le64_to_cpu(group->bg_next_group); 543 group->bg_next_group = cr->c_blkno; 544 ocfs2_journal_dirty(handle, group_bh); 545 546 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode), 547 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE); 548 if (ret < 0) { 549 group->bg_next_group = cpu_to_le64(bg_ptr); 550 mlog_errno(ret); 551 goto out_commit; 552 } 553 554 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) { 555 le16_add_cpu(&cl->cl_next_free_rec, 1); 556 memset(cr, 0, sizeof(struct ocfs2_chain_rec)); 557 } 558 559 cr->c_blkno = cpu_to_le64(input->group); 560 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc); 561 le32_add_cpu(&cr->c_free, input->frees * cl_bpc); 562 563 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc); 564 le32_add_cpu(&fe->id1.bitmap1.i_used, 565 (input->clusters - input->frees) * cl_bpc); 566 le32_add_cpu(&fe->i_clusters, input->clusters); 567 568 ocfs2_journal_dirty(handle, main_bm_bh); 569 570 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock); 571 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); 572 le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits); 573 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock); 574 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size)); 575 576 ocfs2_update_super_and_backups(main_bm_inode, input->clusters); 577 578 out_commit: 579 ocfs2_commit_trans(osb, handle); 580 581 out_free_group_bh: 582 brelse(group_bh); 583 584 out_unlock: 585 brelse(main_bm_bh); 586 587 ocfs2_inode_unlock(main_bm_inode, 1); 588 589 out_mutex: 590 mutex_unlock(&main_bm_inode->i_mutex); 591 iput(main_bm_inode); 592 593 out: 594 return ret; 595 } 596