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 u16 cl_cpg, 57 u16 old_bg_clusters, 58 int set) 59 { 60 int i; 61 u16 backups = 0; 62 u32 cluster, lgd_cluster; 63 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno); 64 65 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { 66 blkno = ocfs2_backup_super_blkno(inode->i_sb, i); 67 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno); 68 69 gd_blkno = ocfs2_which_cluster_group(inode, cluster); 70 if (gd_blkno < lgd_blkno) 71 continue; 72 else if (gd_blkno > lgd_blkno) 73 break; 74 75 /* check if already done backup super */ 76 lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno); 77 lgd_cluster += old_bg_clusters; 78 if (lgd_cluster >= cluster) 79 continue; 80 81 if (set) 82 ocfs2_set_bit(cluster % cl_cpg, 83 (unsigned long *)gd->bg_bitmap); 84 else 85 ocfs2_clear_bit(cluster % cl_cpg, 86 (unsigned long *)gd->bg_bitmap); 87 backups++; 88 } 89 90 return backups; 91 } 92 93 static int ocfs2_update_last_group_and_inode(handle_t *handle, 94 struct inode *bm_inode, 95 struct buffer_head *bm_bh, 96 struct buffer_head *group_bh, 97 u32 first_new_cluster, 98 int new_clusters) 99 { 100 int ret = 0; 101 struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb); 102 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data; 103 struct ocfs2_chain_list *cl = &fe->id2.i_chain; 104 struct ocfs2_chain_rec *cr; 105 struct ocfs2_group_desc *group; 106 u16 chain, num_bits, backups = 0; 107 u16 cl_bpc = le16_to_cpu(cl->cl_bpc); 108 u16 cl_cpg = le16_to_cpu(cl->cl_cpg); 109 u16 old_bg_clusters; 110 111 trace_ocfs2_update_last_group_and_inode(new_clusters, 112 first_new_cluster); 113 114 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode), 115 group_bh, OCFS2_JOURNAL_ACCESS_WRITE); 116 if (ret < 0) { 117 mlog_errno(ret); 118 goto out; 119 } 120 121 group = (struct ocfs2_group_desc *)group_bh->b_data; 122 123 old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc; 124 /* update the group first. */ 125 num_bits = new_clusters * cl_bpc; 126 le16_add_cpu(&group->bg_bits, num_bits); 127 le16_add_cpu(&group->bg_free_bits_count, num_bits); 128 129 /* 130 * check whether there are some new backup superblocks exist in 131 * this group and update the group bitmap accordingly. 132 */ 133 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, 134 OCFS2_FEATURE_COMPAT_BACKUP_SB)) { 135 backups = ocfs2_calc_new_backup_super(bm_inode, 136 group, 137 cl_cpg, old_bg_clusters, 1); 138 le16_add_cpu(&group->bg_free_bits_count, -1 * backups); 139 } 140 141 ocfs2_journal_dirty(handle, group_bh); 142 143 /* update the inode accordingly. */ 144 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh, 145 OCFS2_JOURNAL_ACCESS_WRITE); 146 if (ret < 0) { 147 mlog_errno(ret); 148 goto out_rollback; 149 } 150 151 chain = le16_to_cpu(group->bg_chain); 152 cr = (&cl->cl_recs[chain]); 153 le32_add_cpu(&cr->c_total, num_bits); 154 le32_add_cpu(&cr->c_free, num_bits); 155 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits); 156 le32_add_cpu(&fe->i_clusters, new_clusters); 157 158 if (backups) { 159 le32_add_cpu(&cr->c_free, -1 * backups); 160 le32_add_cpu(&fe->id1.bitmap1.i_used, backups); 161 } 162 163 spin_lock(&OCFS2_I(bm_inode)->ip_lock); 164 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); 165 le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits); 166 spin_unlock(&OCFS2_I(bm_inode)->ip_lock); 167 i_size_write(bm_inode, le64_to_cpu(fe->i_size)); 168 169 ocfs2_journal_dirty(handle, bm_bh); 170 171 out_rollback: 172 if (ret < 0) { 173 ocfs2_calc_new_backup_super(bm_inode, 174 group, 175 cl_cpg, old_bg_clusters, 0); 176 le16_add_cpu(&group->bg_free_bits_count, backups); 177 le16_add_cpu(&group->bg_bits, -1 * num_bits); 178 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits); 179 } 180 out: 181 if (ret) 182 mlog_errno(ret); 183 return ret; 184 } 185 186 static int update_backups(struct inode * inode, u32 clusters, char *data) 187 { 188 int i, ret = 0; 189 u32 cluster; 190 u64 blkno; 191 struct buffer_head *backup = NULL; 192 struct ocfs2_dinode *backup_di = NULL; 193 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 194 195 /* calculate the real backups we need to update. */ 196 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { 197 blkno = ocfs2_backup_super_blkno(inode->i_sb, i); 198 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno); 199 if (cluster > clusters) 200 break; 201 202 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup); 203 if (ret < 0) { 204 mlog_errno(ret); 205 break; 206 } 207 208 memcpy(backup->b_data, data, inode->i_sb->s_blocksize); 209 210 backup_di = (struct ocfs2_dinode *)backup->b_data; 211 backup_di->i_blkno = cpu_to_le64(blkno); 212 213 ret = ocfs2_write_super_or_backup(osb, backup); 214 brelse(backup); 215 backup = NULL; 216 if (ret < 0) { 217 mlog_errno(ret); 218 break; 219 } 220 } 221 222 return ret; 223 } 224 225 static void ocfs2_update_super_and_backups(struct inode *inode, 226 int new_clusters) 227 { 228 int ret; 229 u32 clusters = 0; 230 struct buffer_head *super_bh = NULL; 231 struct ocfs2_dinode *super_di = NULL; 232 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 233 234 /* 235 * update the superblock last. 236 * It doesn't matter if the write failed. 237 */ 238 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1, 239 &super_bh); 240 if (ret < 0) { 241 mlog_errno(ret); 242 goto out; 243 } 244 245 super_di = (struct ocfs2_dinode *)super_bh->b_data; 246 le32_add_cpu(&super_di->i_clusters, new_clusters); 247 clusters = le32_to_cpu(super_di->i_clusters); 248 249 ret = ocfs2_write_super_or_backup(osb, super_bh); 250 if (ret < 0) { 251 mlog_errno(ret); 252 goto out; 253 } 254 255 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB)) 256 ret = update_backups(inode, clusters, super_bh->b_data); 257 258 out: 259 brelse(super_bh); 260 if (ret) 261 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s" 262 " during fs resize. This condition is not fatal," 263 " but fsck.ocfs2 should be run to fix it\n", 264 osb->dev_str); 265 return; 266 } 267 268 /* 269 * Extend the filesystem to the new number of clusters specified. This entry 270 * point is only used to extend the current filesystem to the end of the last 271 * existing group. 272 */ 273 int ocfs2_group_extend(struct inode * inode, int new_clusters) 274 { 275 int ret; 276 handle_t *handle; 277 struct buffer_head *main_bm_bh = NULL; 278 struct buffer_head *group_bh = NULL; 279 struct inode *main_bm_inode = NULL; 280 struct ocfs2_dinode *fe = NULL; 281 struct ocfs2_group_desc *group = NULL; 282 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 283 u16 cl_bpc; 284 u32 first_new_cluster; 285 u64 lgd_blkno; 286 287 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) 288 return -EROFS; 289 290 if (new_clusters < 0) 291 return -EINVAL; 292 else if (new_clusters == 0) 293 return 0; 294 295 main_bm_inode = ocfs2_get_system_file_inode(osb, 296 GLOBAL_BITMAP_SYSTEM_INODE, 297 OCFS2_INVALID_SLOT); 298 if (!main_bm_inode) { 299 ret = -EINVAL; 300 mlog_errno(ret); 301 goto out; 302 } 303 304 inode_lock(main_bm_inode); 305 306 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); 307 if (ret < 0) { 308 mlog_errno(ret); 309 goto out_mutex; 310 } 311 312 fe = (struct ocfs2_dinode *)main_bm_bh->b_data; 313 314 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(), 315 * so any corruption is a code bug. */ 316 BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); 317 318 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != 319 ocfs2_group_bitmap_size(osb->sb, 0, 320 osb->s_feature_incompat) * 8) { 321 mlog(ML_ERROR, "The disk is too old and small. " 322 "Force to do offline resize."); 323 ret = -EINVAL; 324 goto out_unlock; 325 } 326 327 first_new_cluster = le32_to_cpu(fe->i_clusters); 328 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode, 329 first_new_cluster - 1); 330 331 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno, 332 &group_bh); 333 if (ret < 0) { 334 mlog_errno(ret); 335 goto out_unlock; 336 } 337 group = (struct ocfs2_group_desc *)group_bh->b_data; 338 339 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); 340 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters > 341 le16_to_cpu(fe->id2.i_chain.cl_cpg)) { 342 ret = -EINVAL; 343 goto out_unlock; 344 } 345 346 347 trace_ocfs2_group_extend( 348 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters); 349 350 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS); 351 if (IS_ERR(handle)) { 352 mlog_errno(PTR_ERR(handle)); 353 ret = -EINVAL; 354 goto out_unlock; 355 } 356 357 /* update the last group descriptor and inode. */ 358 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode, 359 main_bm_bh, group_bh, 360 first_new_cluster, 361 new_clusters); 362 if (ret) { 363 mlog_errno(ret); 364 goto out_commit; 365 } 366 367 ocfs2_update_super_and_backups(main_bm_inode, new_clusters); 368 369 out_commit: 370 ocfs2_commit_trans(osb, handle); 371 out_unlock: 372 brelse(group_bh); 373 brelse(main_bm_bh); 374 375 ocfs2_inode_unlock(main_bm_inode, 1); 376 377 out_mutex: 378 inode_unlock(main_bm_inode); 379 iput(main_bm_inode); 380 381 out: 382 return ret; 383 } 384 385 static int ocfs2_check_new_group(struct inode *inode, 386 struct ocfs2_dinode *di, 387 struct ocfs2_new_group_input *input, 388 struct buffer_head *group_bh) 389 { 390 int ret; 391 struct ocfs2_group_desc *gd = 392 (struct ocfs2_group_desc *)group_bh->b_data; 393 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc); 394 395 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh); 396 if (ret) 397 goto out; 398 399 ret = -EINVAL; 400 if (le16_to_cpu(gd->bg_chain) != input->chain) 401 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u " 402 "while input has %u set.\n", 403 (unsigned long long)le64_to_cpu(gd->bg_blkno), 404 le16_to_cpu(gd->bg_chain), input->chain); 405 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc) 406 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but " 407 "input has %u clusters set\n", 408 (unsigned long long)le64_to_cpu(gd->bg_blkno), 409 le16_to_cpu(gd->bg_bits), input->clusters); 410 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc) 411 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u " 412 "but it should have %u set\n", 413 (unsigned long long)le64_to_cpu(gd->bg_blkno), 414 le16_to_cpu(gd->bg_bits), 415 input->frees * cl_bpc); 416 else 417 ret = 0; 418 419 out: 420 return ret; 421 } 422 423 static int ocfs2_verify_group_and_input(struct inode *inode, 424 struct ocfs2_dinode *di, 425 struct ocfs2_new_group_input *input, 426 struct buffer_head *group_bh) 427 { 428 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count); 429 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg); 430 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec); 431 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group); 432 u32 total_clusters = le32_to_cpu(di->i_clusters); 433 int ret = -EINVAL; 434 435 if (cluster < total_clusters) 436 mlog(ML_ERROR, "add a group which is in the current volume.\n"); 437 else if (input->chain >= cl_count) 438 mlog(ML_ERROR, "input chain exceeds the limit.\n"); 439 else if (next_free != cl_count && next_free != input->chain) 440 mlog(ML_ERROR, 441 "the add group should be in chain %u\n", next_free); 442 else if (total_clusters + input->clusters < total_clusters) 443 mlog(ML_ERROR, "add group's clusters overflow.\n"); 444 else if (input->clusters > cl_cpg) 445 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n"); 446 else if (input->frees > input->clusters) 447 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n"); 448 else if (total_clusters % cl_cpg != 0) 449 mlog(ML_ERROR, 450 "the last group isn't full. Use group extend first.\n"); 451 else if (input->group != ocfs2_which_cluster_group(inode, cluster)) 452 mlog(ML_ERROR, "group blkno is invalid\n"); 453 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh))) 454 mlog(ML_ERROR, "group descriptor check failed.\n"); 455 else 456 ret = 0; 457 458 return ret; 459 } 460 461 /* Add a new group descriptor to global_bitmap. */ 462 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input) 463 { 464 int ret; 465 handle_t *handle; 466 struct buffer_head *main_bm_bh = NULL; 467 struct inode *main_bm_inode = NULL; 468 struct ocfs2_dinode *fe = NULL; 469 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 470 struct buffer_head *group_bh = NULL; 471 struct ocfs2_group_desc *group = NULL; 472 struct ocfs2_chain_list *cl; 473 struct ocfs2_chain_rec *cr; 474 u16 cl_bpc; 475 u64 bg_ptr; 476 477 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) 478 return -EROFS; 479 480 main_bm_inode = ocfs2_get_system_file_inode(osb, 481 GLOBAL_BITMAP_SYSTEM_INODE, 482 OCFS2_INVALID_SLOT); 483 if (!main_bm_inode) { 484 ret = -EINVAL; 485 mlog_errno(ret); 486 goto out; 487 } 488 489 inode_lock(main_bm_inode); 490 491 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); 492 if (ret < 0) { 493 mlog_errno(ret); 494 goto out_mutex; 495 } 496 497 fe = (struct ocfs2_dinode *)main_bm_bh->b_data; 498 499 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != 500 ocfs2_group_bitmap_size(osb->sb, 0, 501 osb->s_feature_incompat) * 8) { 502 mlog(ML_ERROR, "The disk is too old and small." 503 " Force to do offline resize."); 504 ret = -EINVAL; 505 goto out_unlock; 506 } 507 508 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh); 509 if (ret < 0) { 510 mlog(ML_ERROR, "Can't read the group descriptor # %llu " 511 "from the device.", (unsigned long long)input->group); 512 goto out_unlock; 513 } 514 515 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh); 516 517 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh); 518 if (ret) { 519 mlog_errno(ret); 520 goto out_free_group_bh; 521 } 522 523 trace_ocfs2_group_add((unsigned long long)input->group, 524 input->chain, input->clusters, input->frees); 525 526 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS); 527 if (IS_ERR(handle)) { 528 mlog_errno(PTR_ERR(handle)); 529 ret = -EINVAL; 530 goto out_free_group_bh; 531 } 532 533 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); 534 cl = &fe->id2.i_chain; 535 cr = &cl->cl_recs[input->chain]; 536 537 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode), 538 group_bh, OCFS2_JOURNAL_ACCESS_WRITE); 539 if (ret < 0) { 540 mlog_errno(ret); 541 goto out_commit; 542 } 543 544 group = (struct ocfs2_group_desc *)group_bh->b_data; 545 bg_ptr = le64_to_cpu(group->bg_next_group); 546 group->bg_next_group = cr->c_blkno; 547 ocfs2_journal_dirty(handle, group_bh); 548 549 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode), 550 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE); 551 if (ret < 0) { 552 group->bg_next_group = cpu_to_le64(bg_ptr); 553 mlog_errno(ret); 554 goto out_commit; 555 } 556 557 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) { 558 le16_add_cpu(&cl->cl_next_free_rec, 1); 559 memset(cr, 0, sizeof(struct ocfs2_chain_rec)); 560 } 561 562 cr->c_blkno = cpu_to_le64(input->group); 563 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc); 564 le32_add_cpu(&cr->c_free, input->frees * cl_bpc); 565 566 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc); 567 le32_add_cpu(&fe->id1.bitmap1.i_used, 568 (input->clusters - input->frees) * cl_bpc); 569 le32_add_cpu(&fe->i_clusters, input->clusters); 570 571 ocfs2_journal_dirty(handle, main_bm_bh); 572 573 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock); 574 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); 575 le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits); 576 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock); 577 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size)); 578 579 ocfs2_update_super_and_backups(main_bm_inode, input->clusters); 580 581 out_commit: 582 ocfs2_commit_trans(osb, handle); 583 584 out_free_group_bh: 585 brelse(group_bh); 586 587 out_unlock: 588 brelse(main_bm_bh); 589 590 ocfs2_inode_unlock(main_bm_inode, 1); 591 592 out_mutex: 593 inode_unlock(main_bm_inode); 594 iput(main_bm_inode); 595 596 out: 597 return ret; 598 } 599