linux/fs/ocfs2/resize.c
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   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 */
  54static 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
  88static 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
 166out_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        }
 177out:
 178        if (ret)
 179                mlog_errno(ret);
 180        return ret;
 181}
 182
 183static 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
 222static 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
 255out:
 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 */
 270int 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
 366out_commit:
 367        ocfs2_commit_trans(osb, handle);
 368out_unlock:
 369        brelse(group_bh);
 370        brelse(main_bm_bh);
 371
 372        ocfs2_inode_unlock(main_bm_inode, 1);
 373
 374out_mutex:
 375        mutex_unlock(&main_bm_inode->i_mutex);
 376        iput(main_bm_inode);
 377
 378out:
 379        return ret;
 380}
 381
 382static 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
 416out:
 417        return ret;
 418}
 419
 420static 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. */
 459int 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
 473        if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 474                return -EROFS;
 475
 476        main_bm_inode = ocfs2_get_system_file_inode(osb,
 477                                                    GLOBAL_BITMAP_SYSTEM_INODE,
 478                                                    OCFS2_INVALID_SLOT);
 479        if (!main_bm_inode) {
 480                ret = -EINVAL;
 481                mlog_errno(ret);
 482                goto out;
 483        }
 484
 485        mutex_lock(&main_bm_inode->i_mutex);
 486
 487        ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 488        if (ret < 0) {
 489                mlog_errno(ret);
 490                goto out_mutex;
 491        }
 492
 493        fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 494
 495        if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 496                ocfs2_group_bitmap_size(osb->sb, 0,
 497                                        osb->s_feature_incompat) * 8) {
 498                mlog(ML_ERROR, "The disk is too old and small."
 499                     " Force to do offline resize.");
 500                ret = -EINVAL;
 501                goto out_unlock;
 502        }
 503
 504        ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
 505        if (ret < 0) {
 506                mlog(ML_ERROR, "Can't read the group descriptor # %llu "
 507                     "from the device.", (unsigned long long)input->group);
 508                goto out_unlock;
 509        }
 510
 511        ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
 512
 513        ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
 514        if (ret) {
 515                mlog_errno(ret);
 516                goto out_unlock;
 517        }
 518
 519        trace_ocfs2_group_add((unsigned long long)input->group,
 520                               input->chain, input->clusters, input->frees);
 521
 522        handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
 523        if (IS_ERR(handle)) {
 524                mlog_errno(PTR_ERR(handle));
 525                ret = -EINVAL;
 526                goto out_unlock;
 527        }
 528
 529        cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 530        cl = &fe->id2.i_chain;
 531        cr = &cl->cl_recs[input->chain];
 532
 533        ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
 534                                      group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 535        if (ret < 0) {
 536                mlog_errno(ret);
 537                goto out_commit;
 538        }
 539
 540        group = (struct ocfs2_group_desc *)group_bh->b_data;
 541        group->bg_next_group = cr->c_blkno;
 542        ocfs2_journal_dirty(handle, group_bh);
 543
 544        ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
 545                                      main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 546        if (ret < 0) {
 547                mlog_errno(ret);
 548                goto out_commit;
 549        }
 550
 551        if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
 552                le16_add_cpu(&cl->cl_next_free_rec, 1);
 553                memset(cr, 0, sizeof(struct ocfs2_chain_rec));
 554        }
 555
 556        cr->c_blkno = cpu_to_le64(input->group);
 557        le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
 558        le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
 559
 560        le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
 561        le32_add_cpu(&fe->id1.bitmap1.i_used,
 562                     (input->clusters - input->frees) * cl_bpc);
 563        le32_add_cpu(&fe->i_clusters, input->clusters);
 564
 565        ocfs2_journal_dirty(handle, main_bm_bh);
 566
 567        spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
 568        OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 569        le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
 570        spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
 571        i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
 572
 573        ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
 574
 575out_commit:
 576        ocfs2_commit_trans(osb, handle);
 577out_unlock:
 578        brelse(group_bh);
 579        brelse(main_bm_bh);
 580
 581        ocfs2_inode_unlock(main_bm_inode, 1);
 582
 583out_mutex:
 584        mutex_unlock(&main_bm_inode->i_mutex);
 585        iput(main_bm_inode);
 586
 587out:
 588        return ret;
 589}
 590
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