1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * resize.c 4 * 5 * volume resize. 6 * Inspired by ext3/resize.c. 7 * 8 * Copyright (C) 2007 Oracle. All rights reserved. 9 */ 10 11#include <linux/fs.h> 12#include <linux/types.h> 13 14#include <cluster/masklog.h> 15 16#include "ocfs2.h" 17 18#include "alloc.h" 19#include "dlmglue.h" 20#include "inode.h" 21#include "journal.h" 22#include "super.h" 23#include "sysfile.h" 24#include "uptodate.h" 25#include "ocfs2_trace.h" 26 27#include "buffer_head_io.h" 28#include "suballoc.h" 29#include "resize.h" 30 31/* 32 * Check whether there are new backup superblocks exist 33 * in the last group. If there are some, mark them or clear 34 * them in the bitmap. 35 * 36 * Return how many backups we find in the last group. 37 */ 38static u16 ocfs2_calc_new_backup_super(struct inode *inode, 39 struct ocfs2_group_desc *gd, 40 u16 cl_cpg, 41 u16 old_bg_clusters, 42 int set) 43{ 44 int i; 45 u16 backups = 0; 46 u32 cluster, lgd_cluster; 47 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno); 48 49 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { 50 blkno = ocfs2_backup_super_blkno(inode->i_sb, i); 51 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno); 52 53 gd_blkno = ocfs2_which_cluster_group(inode, cluster); 54 if (gd_blkno < lgd_blkno) 55 continue; 56 else if (gd_blkno > lgd_blkno) 57 break; 58 59 /* check if already done backup super */ 60 lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno); 61 lgd_cluster += old_bg_clusters; 62 if (lgd_cluster >= cluster) 63 continue; 64 65 if (set) 66 ocfs2_set_bit(cluster % cl_cpg, 67 (unsigned long *)gd->bg_bitmap); 68 else 69 ocfs2_clear_bit(cluster % cl_cpg, 70 (unsigned long *)gd->bg_bitmap); 71 backups++; 72 } 73 74 return backups; 75} 76 77static int ocfs2_update_last_group_and_inode(handle_t *handle, 78 struct inode *bm_inode, 79 struct buffer_head *bm_bh, 80 struct buffer_head *group_bh, 81 u32 first_new_cluster, 82 int new_clusters) 83{ 84 int ret = 0; 85 struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb); 86 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data; 87 struct ocfs2_chain_list *cl = &fe->id2.i_chain; 88 struct ocfs2_chain_rec *cr; 89 struct ocfs2_group_desc *group; 90 u16 chain, num_bits, backups = 0; 91 u16 cl_bpc = le16_to_cpu(cl->cl_bpc); 92 u16 cl_cpg = le16_to_cpu(cl->cl_cpg); 93 u16 old_bg_clusters; 94 95 trace_ocfs2_update_last_group_and_inode(new_clusters, 96 first_new_cluster); 97 98 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode), 99 group_bh, OCFS2_JOURNAL_ACCESS_WRITE); 100 if (ret < 0) { 101 mlog_errno(ret); 102 goto out; 103 } 104 105 group = (struct ocfs2_group_desc *)group_bh->b_data; 106 107 old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc; 108 /* update the group first. */ 109 num_bits = new_clusters * cl_bpc; 110 le16_add_cpu(&group->bg_bits, num_bits); 111 le16_add_cpu(&group->bg_free_bits_count, num_bits); 112 113 /* 114 * check whether there are some new backup superblocks exist in 115 * this group and update the group bitmap accordingly. 116 */ 117 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, 118 OCFS2_FEATURE_COMPAT_BACKUP_SB)) { 119 backups = ocfs2_calc_new_backup_super(bm_inode, 120 group, 121 cl_cpg, old_bg_clusters, 1); 122 le16_add_cpu(&group->bg_free_bits_count, -1 * backups); 123 } 124 125 ocfs2_journal_dirty(handle, group_bh); 126 127 /* update the inode accordingly. */ 128 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh, 129 OCFS2_JOURNAL_ACCESS_WRITE); 130 if (ret < 0) { 131 mlog_errno(ret); 132 goto out_rollback; 133 } 134 135 chain = le16_to_cpu(group->bg_chain); 136 cr = (&cl->cl_recs[chain]); 137 le32_add_cpu(&cr->c_total, num_bits); 138 le32_add_cpu(&cr->c_free, num_bits); 139 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits); 140 le32_add_cpu(&fe->i_clusters, new_clusters); 141 142 if (backups) { 143 le32_add_cpu(&cr->c_free, -1 * backups); 144 le32_add_cpu(&fe->id1.bitmap1.i_used, backups); 145 } 146 147 spin_lock(&OCFS2_I(bm_inode)->ip_lock); 148 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); 149 le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits); 150 spin_unlock(&OCFS2_I(bm_inode)->ip_lock); 151 i_size_write(bm_inode, le64_to_cpu(fe->i_size)); 152 153 ocfs2_journal_dirty(handle, bm_bh); 154 155out_rollback: 156 if (ret < 0) { 157 ocfs2_calc_new_backup_super(bm_inode, 158 group, 159 cl_cpg, old_bg_clusters, 0); 160 le16_add_cpu(&group->bg_free_bits_count, backups); 161 le16_add_cpu(&group->bg_bits, -1 * num_bits); 162 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits); 163 } 164out: 165 if (ret) 166 mlog_errno(ret); 167 return ret; 168} 169 170static int update_backups(struct inode * inode, u32 clusters, char *data) 171{ 172 int i, ret = 0; 173 u32 cluster; 174 u64 blkno; 175 struct buffer_head *backup = NULL; 176 struct ocfs2_dinode *backup_di = NULL; 177 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 178 179 /* calculate the real backups we need to update. */ 180 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { 181 blkno = ocfs2_backup_super_blkno(inode->i_sb, i); 182 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno); 183 if (cluster >= clusters) 184 break; 185 186 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup); 187 if (ret < 0) { 188 mlog_errno(ret); 189 break; 190 } 191 192 memcpy(backup->b_data, data, inode->i_sb->s_blocksize); 193 194 backup_di = (struct ocfs2_dinode *)backup->b_data; 195 backup_di->i_blkno = cpu_to_le64(blkno); 196 197 ret = ocfs2_write_super_or_backup(osb, backup); 198 brelse(backup); 199 backup = NULL; 200 if (ret < 0) { 201 mlog_errno(ret); 202 break; 203 } 204 } 205 206 return ret; 207} 208 209static void ocfs2_update_super_and_backups(struct inode *inode, 210 int new_clusters) 211{ 212 int ret; 213 u32 clusters = 0; 214 struct buffer_head *super_bh = NULL; 215 struct ocfs2_dinode *super_di = NULL; 216 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 217 218 /* 219 * update the superblock last. 220 * It doesn't matter if the write failed. 221 */ 222 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1, 223 &super_bh); 224 if (ret < 0) { 225 mlog_errno(ret); 226 goto out; 227 } 228 229 super_di = (struct ocfs2_dinode *)super_bh->b_data; 230 le32_add_cpu(&super_di->i_clusters, new_clusters); 231 clusters = le32_to_cpu(super_di->i_clusters); 232 233 ret = ocfs2_write_super_or_backup(osb, super_bh); 234 if (ret < 0) { 235 mlog_errno(ret); 236 goto out; 237 } 238 239 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB)) 240 ret = update_backups(inode, clusters, super_bh->b_data); 241 242out: 243 brelse(super_bh); 244 if (ret) 245 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s" 246 " during fs resize. This condition is not fatal," 247 " but fsck.ocfs2 should be run to fix it\n", 248 osb->dev_str); 249 return; 250} 251 252/* 253 * Extend the filesystem to the new number of clusters specified. This entry 254 * point is only used to extend the current filesystem to the end of the last 255 * existing group. 256 */ 257int ocfs2_group_extend(struct inode * inode, int new_clusters) 258{ 259 int ret; 260 handle_t *handle; 261 struct buffer_head *main_bm_bh = NULL; 262 struct buffer_head *group_bh = NULL; 263 struct inode *main_bm_inode = NULL; 264 struct ocfs2_dinode *fe = NULL; 265 struct ocfs2_group_desc *group = NULL; 266 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 267 u16 cl_bpc; 268 u32 first_new_cluster; 269 u64 lgd_blkno; 270 271 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) 272 return -EROFS; 273 274 if (new_clusters < 0) 275 return -EINVAL; 276 else if (new_clusters == 0) 277 return 0; 278 279 main_bm_inode = ocfs2_get_system_file_inode(osb, 280 GLOBAL_BITMAP_SYSTEM_INODE, 281 OCFS2_INVALID_SLOT); 282 if (!main_bm_inode) { 283 ret = -EINVAL; 284 mlog_errno(ret); 285 goto out; 286 } 287 288 inode_lock(main_bm_inode); 289 290 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); 291 if (ret < 0) { 292 mlog_errno(ret); 293 goto out_mutex; 294 } 295 296 fe = (struct ocfs2_dinode *)main_bm_bh->b_data; 297 298 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(), 299 * so any corruption is a code bug. */ 300 BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); 301 302 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != 303 ocfs2_group_bitmap_size(osb->sb, 0, 304 osb->s_feature_incompat) * 8) { 305 mlog(ML_ERROR, "The disk is too old and small. " 306 "Force to do offline resize."); 307 ret = -EINVAL; 308 goto out_unlock; 309 } 310 311 first_new_cluster = le32_to_cpu(fe->i_clusters); 312 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode, 313 first_new_cluster - 1); 314 315 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno, 316 &group_bh); 317 if (ret < 0) { 318 mlog_errno(ret); 319 goto out_unlock; 320 } 321 group = (struct ocfs2_group_desc *)group_bh->b_data; 322 323 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); 324 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters > 325 le16_to_cpu(fe->id2.i_chain.cl_cpg)) { 326 ret = -EINVAL; 327 goto out_unlock; 328 } 329 330 331 trace_ocfs2_group_extend( 332 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters); 333 334 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS); 335 if (IS_ERR(handle)) { 336 mlog_errno(PTR_ERR(handle)); 337 ret = -EINVAL; 338 goto out_unlock; 339 } 340 341 /* update the last group descriptor and inode. */ 342 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode, 343 main_bm_bh, group_bh, 344 first_new_cluster, 345 new_clusters); 346 if (ret) { 347 mlog_errno(ret); 348 goto out_commit; 349 } 350 351 ocfs2_update_super_and_backups(main_bm_inode, new_clusters); 352 353out_commit: 354 ocfs2_commit_trans(osb, handle); 355out_unlock: 356 brelse(group_bh); 357 brelse(main_bm_bh); 358 359 ocfs2_inode_unlock(main_bm_inode, 1); 360 361out_mutex: 362 inode_unlock(main_bm_inode); 363 iput(main_bm_inode); 364 365out: 366 return ret; 367} 368 369static int ocfs2_check_new_group(struct inode *inode, 370 struct ocfs2_dinode *di, 371 struct ocfs2_new_group_input *input, 372 struct buffer_head *group_bh) 373{ 374 int ret; 375 struct ocfs2_group_desc *gd = 376 (struct ocfs2_group_desc *)group_bh->b_data; 377 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc); 378 379 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh); 380 if (ret) 381 goto out; 382 383 ret = -EINVAL; 384 if (le16_to_cpu(gd->bg_chain) != input->chain) 385 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u " 386 "while input has %u set.\n", 387 (unsigned long long)le64_to_cpu(gd->bg_blkno), 388 le16_to_cpu(gd->bg_chain), input->chain); 389 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc) 390 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but " 391 "input has %u clusters set\n", 392 (unsigned long long)le64_to_cpu(gd->bg_blkno), 393 le16_to_cpu(gd->bg_bits), input->clusters); 394 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc) 395 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u " 396 "but it should have %u set\n", 397 (unsigned long long)le64_to_cpu(gd->bg_blkno), 398 le16_to_cpu(gd->bg_bits), 399 input->frees * cl_bpc); 400 else 401 ret = 0; 402 403out: 404 return ret; 405} 406 407static int ocfs2_verify_group_and_input(struct inode *inode, 408 struct ocfs2_dinode *di, 409 struct ocfs2_new_group_input *input, 410 struct buffer_head *group_bh) 411{ 412 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count); 413 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg); 414 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec); 415 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group); 416 u32 total_clusters = le32_to_cpu(di->i_clusters); 417 int ret = -EINVAL; 418 419 if (cluster < total_clusters) 420 mlog(ML_ERROR, "add a group which is in the current volume.\n"); 421 else if (input->chain >= cl_count) 422 mlog(ML_ERROR, "input chain exceeds the limit.\n"); 423 else if (next_free != cl_count && next_free != input->chain) 424 mlog(ML_ERROR, 425 "the add group should be in chain %u\n", next_free); 426 else if (total_clusters + input->clusters < total_clusters) 427 mlog(ML_ERROR, "add group's clusters overflow.\n"); 428 else if (input->clusters > cl_cpg) 429 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n"); 430 else if (input->frees > input->clusters) 431 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n"); 432 else if (total_clusters % cl_cpg != 0) 433 mlog(ML_ERROR, 434 "the last group isn't full. Use group extend first.\n"); 435 else if (input->group != ocfs2_which_cluster_group(inode, cluster)) 436 mlog(ML_ERROR, "group blkno is invalid\n"); 437 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh))) 438 mlog(ML_ERROR, "group descriptor check failed.\n"); 439 else 440 ret = 0; 441 442 return ret; 443} 444 445/* Add a new group descriptor to global_bitmap. */ 446int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input) 447{ 448 int ret; 449 handle_t *handle; 450 struct buffer_head *main_bm_bh = NULL; 451 struct inode *main_bm_inode = NULL; 452 struct ocfs2_dinode *fe = NULL; 453 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 454 struct buffer_head *group_bh = NULL; 455 struct ocfs2_group_desc *group = NULL; 456 struct ocfs2_chain_list *cl; 457 struct ocfs2_chain_rec *cr; 458 u16 cl_bpc; 459 u64 bg_ptr; 460 461 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) 462 return -EROFS; 463 464 main_bm_inode = ocfs2_get_system_file_inode(osb, 465 GLOBAL_BITMAP_SYSTEM_INODE, 466 OCFS2_INVALID_SLOT); 467 if (!main_bm_inode) { 468 ret = -EINVAL; 469 mlog_errno(ret); 470 goto out; 471 } 472 473 inode_lock(main_bm_inode); 474 475 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); 476 if (ret < 0) { 477 mlog_errno(ret); 478 goto out_mutex; 479 } 480 481 fe = (struct ocfs2_dinode *)main_bm_bh->b_data; 482 483 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) != 484 ocfs2_group_bitmap_size(osb->sb, 0, 485 osb->s_feature_incompat) * 8) { 486 mlog(ML_ERROR, "The disk is too old and small." 487 " Force to do offline resize."); 488 ret = -EINVAL; 489 goto out_unlock; 490 } 491 492 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh); 493 if (ret < 0) { 494 mlog(ML_ERROR, "Can't read the group descriptor # %llu " 495 "from the device.", (unsigned long long)input->group); 496 goto out_unlock; 497 } 498 499 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh); 500 501 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh); 502 if (ret) { 503 mlog_errno(ret); 504 goto out_free_group_bh; 505 } 506 507 trace_ocfs2_group_add((unsigned long long)input->group, 508 input->chain, input->clusters, input->frees); 509 510 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS); 511 if (IS_ERR(handle)) { 512 mlog_errno(PTR_ERR(handle)); 513 ret = -EINVAL; 514 goto out_free_group_bh; 515 } 516 517 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc); 518 cl = &fe->id2.i_chain; 519 cr = &cl->cl_recs[input->chain]; 520 521 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode), 522 group_bh, OCFS2_JOURNAL_ACCESS_WRITE); 523 if (ret < 0) { 524 mlog_errno(ret); 525 goto out_commit; 526 } 527 528 group = (struct ocfs2_group_desc *)group_bh->b_data; 529 bg_ptr = le64_to_cpu(group->bg_next_group); 530 group->bg_next_group = cr->c_blkno; 531 ocfs2_journal_dirty(handle, group_bh); 532 533 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode), 534 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE); 535 if (ret < 0) { 536 group->bg_next_group = cpu_to_le64(bg_ptr); 537 mlog_errno(ret); 538 goto out_commit; 539 } 540 541 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) { 542 le16_add_cpu(&cl->cl_next_free_rec, 1); 543 memset(cr, 0, sizeof(struct ocfs2_chain_rec)); 544 } 545 546 cr->c_blkno = cpu_to_le64(input->group); 547 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc); 548 le32_add_cpu(&cr->c_free, input->frees * cl_bpc); 549 550 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc); 551 le32_add_cpu(&fe->id1.bitmap1.i_used, 552 (input->clusters - input->frees) * cl_bpc); 553 le32_add_cpu(&fe->i_clusters, input->clusters); 554 555 ocfs2_journal_dirty(handle, main_bm_bh); 556 557 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock); 558 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); 559 le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits); 560 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock); 561 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size)); 562 563 ocfs2_update_super_and_backups(main_bm_inode, input->clusters); 564 565out_commit: 566 ocfs2_commit_trans(osb, handle); 567 568out_free_group_bh: 569 brelse(group_bh); 570 571out_unlock: 572 brelse(main_bm_bh); 573 574 ocfs2_inode_unlock(main_bm_inode, 1); 575 576out_mutex: 577 inode_unlock(main_bm_inode); 578 iput(main_bm_inode); 579 580out: 581 return ret; 582} 583