fs/ocfs2/resize.c

   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 #define MLOG_MASK_PREFIX ML_DISK_ALLOC
  31 #include <cluster/masklog.h>
  32
  33 #include "ocfs2.h"
  34
  35 #include "alloc.h"
  36 #include "dlmglue.h"
  37 #include "inode.h"
  38 #include "journal.h"
  39 #include "super.h"
  40 #include "sysfile.h"
  41 #include "uptodate.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         mlog_exit_void();
  86         return backups;
  87 }
  88
  89 static int ocfs2_update_last_group_and_inode(handle_t *handle,
  90                                              struct inode *bm_inode,
  91                                              struct buffer_head *bm_bh,
  92                                              struct buffer_head *group_bh,
  93                                              u32 first_new_cluster,
  94                                              int new_clusters)
  95 {
  96         int ret = 0;
  97         struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
  98         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
  99         struct ocfs2_chain_list *cl = &fe->id2.i_chain;
 100         struct ocfs2_chain_rec *cr;
 101         struct ocfs2_group_desc *group;
 102         u16 chain, num_bits, backups = 0;
 103         u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
 104         u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
 105
 106         mlog_entry("(new_clusters=%d, first_new_cluster = %u)\n",
 107                    new_clusters, first_new_cluster);
 108
 109         ret = ocfs2_journal_access(handle, bm_inode, group_bh,
 110                                    OCFS2_JOURNAL_ACCESS_WRITE);
 111         if (ret < 0) {
 112                 mlog_errno(ret);
 113                 goto out;
 114         }
 115
 116         group = (struct ocfs2_group_desc *)group_bh->b_data;
 117
 118         /* update the group first. */
 119         num_bits = new_clusters * cl_bpc;
 120         le16_add_cpu(&group->bg_bits, num_bits);
 121         le16_add_cpu(&group->bg_free_bits_count, num_bits);
 122
 123         /*
 124          * check whether there are some new backup superblocks exist in
 125          * this group and update the group bitmap accordingly.
 126          */
 127         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
 128                                      OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
 129                 backups = ocfs2_calc_new_backup_super(bm_inode,
 130                                                      group,
 131                                                      new_clusters,
 132                                                      first_new_cluster,
 133                                                      cl_cpg, 1);
 134                 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
 135         }
 136
 137         ret = ocfs2_journal_dirty(handle, group_bh);
 138         if (ret < 0) {
 139                 mlog_errno(ret);
 140                 goto out_rollback;
 141         }
 142
 143         /* update the inode accordingly. */
 144         ret = ocfs2_journal_access(handle, 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, 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                                             new_clusters,
 176                                             first_new_cluster,
 177                                             cl_cpg, 0);
 178                 le16_add_cpu(&group->bg_free_bits_count, backups);
 179                 le16_add_cpu(&group->bg_bits, -1 * num_bits);
 180                 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
 181         }
 182 out:
 183         mlog_exit(ret);
 184         return ret;
 185 }
 186
 187 static int update_backups(struct inode * inode, u32 clusters, char *data)
 188 {
 189         int i, ret = 0;
 190         u32 cluster;
 191         u64 blkno;
 192         struct buffer_head *backup = NULL;
 193         struct ocfs2_dinode *backup_di = NULL;
 194         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 195
 196         /* calculate the real backups we need to update. */
 197         for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
 198                 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
 199                 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
 200                 if (cluster > clusters)
 201                         break;
 202
 203                 ret = ocfs2_read_block(osb, blkno, &backup, 0, NULL);
 204                 if (ret < 0) {
 205                         mlog_errno(ret);
 206                         break;
 207                 }
 208
 209                 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
 210
 211                 backup_di = (struct ocfs2_dinode *)backup->b_data;
 212                 backup_di->i_blkno = cpu_to_le64(blkno);
 213
 214                 ret = ocfs2_write_super_or_backup(osb, backup);
 215                 brelse(backup);
 216                 backup = NULL;
 217                 if (ret < 0) {
 218                         mlog_errno(ret);
 219                         break;
 220                 }
 221         }
 222
 223         return ret;
 224 }
 225
 226 static void ocfs2_update_super_and_backups(struct inode *inode,
 227                                            int new_clusters)
 228 {
 229         int ret;
 230         u32 clusters = 0;
 231         struct buffer_head *super_bh = NULL;
 232         struct ocfs2_dinode *super_di = NULL;
 233         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 234
 235         /*
 236          * update the superblock last.
 237          * It doesn't matter if the write failed.
 238          */
 239         ret = ocfs2_read_block(osb, OCFS2_SUPER_BLOCK_BLKNO,
 240                                &super_bh, 0, NULL);
 241         if (ret < 0) {
 242                 mlog_errno(ret);
 243                 goto out;
 244         }
 245
 246         super_di = (struct ocfs2_dinode *)super_bh->b_data;
 247         le32_add_cpu(&super_di->i_clusters, new_clusters);
 248         clusters = le32_to_cpu(super_di->i_clusters);
 249
 250         ret = ocfs2_write_super_or_backup(osb, super_bh);
 251         if (ret < 0) {
 252                 mlog_errno(ret);
 253                 goto out;
 254         }
 255
 256         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
 257                 ret = update_backups(inode, clusters, super_bh->b_data);
 258
 259 out:
 260         if (super_bh)
 261                 brelse(super_bh);
 262         if (ret)
 263                 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
 264                         " during fs resize. This condition is not fatal,"
 265                         " but fsck.ocfs2 should be run to fix it\n",
 266                         osb->dev_str);
 267         return;
 268 }
 269
 270 /*
 271  * Extend the filesystem to the new number of clusters specified.  This entry
 272  * point is only used to extend the current filesystem to the end of the last
 273  * existing group.
 274  */
 275 int ocfs2_group_extend(struct inode * inode, int new_clusters)
 276 {
 277         int ret;
 278         handle_t *handle;
 279         struct buffer_head *main_bm_bh = NULL;
 280         struct buffer_head *group_bh = NULL;
 281         struct inode *main_bm_inode = NULL;
 282         struct ocfs2_dinode *fe = NULL;
 283         struct ocfs2_group_desc *group = NULL;
 284         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 285         u16 cl_bpc;
 286         u32 first_new_cluster;
 287         u64 lgd_blkno;
 288
 289         mlog_entry_void();
 290
 291         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 292                 return -EROFS;
 293
 294         if (new_clusters < 0)
 295                 return -EINVAL;
 296         else if (new_clusters == 0)
 297                 return 0;
 298
 299         main_bm_inode = ocfs2_get_system_file_inode(osb,
 300                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 301                                                     OCFS2_INVALID_SLOT);
 302         if (!main_bm_inode) {
 303                 ret = -EINVAL;
 304                 mlog_errno(ret);
 305                 goto out;
 306         }
 307
 308         mutex_lock(&main_bm_inode->i_mutex);
 309
 310         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 311         if (ret < 0) {
 312                 mlog_errno(ret);
 313                 goto out_mutex;
 314         }
 315
 316         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 317
 318         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 319                                  ocfs2_group_bitmap_size(osb->sb) * 8) {
 320                 mlog(ML_ERROR, "The disk is too old and small. "
 321                      "Force to do offline resize.");
 322                 ret = -EINVAL;
 323                 goto out_unlock;
 324         }
 325
 326         if (!OCFS2_IS_VALID_DINODE(fe)) {
 327                 OCFS2_RO_ON_INVALID_DINODE(main_bm_inode->i_sb, fe);
 328                 ret = -EIO;
 329                 goto out_unlock;
 330         }
 331
 332         first_new_cluster = le32_to_cpu(fe->i_clusters);
 333         lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
 334                                               first_new_cluster - 1);
 335
 336         ret = ocfs2_read_block(osb, lgd_blkno, &group_bh, OCFS2_BH_CACHED,
 337                                main_bm_inode);
 338         if (ret < 0) {
 339                 mlog_errno(ret);
 340                 goto out_unlock;
 341         }
 342
 343         group = (struct ocfs2_group_desc *)group_bh->b_data;
 344
 345         ret = ocfs2_check_group_descriptor(inode->i_sb, fe, group);
 346         if (ret) {
 347                 mlog_errno(ret);
 348                 goto out_unlock;
 349         }
 350
 351         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 352         if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
 353                 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
 354                 ret = -EINVAL;
 355                 goto out_unlock;
 356         }
 357
 358         mlog(0, "extend the last group at %llu, new clusters = %d\n",
 359              le64_to_cpu(group->bg_blkno), new_clusters);
 360
 361         handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
 362         if (IS_ERR(handle)) {
 363                 mlog_errno(PTR_ERR(handle));
 364                 ret = -EINVAL;
 365                 goto out_unlock;
 366         }
 367
 368         /* update the last group descriptor and inode. */
 369         ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
 370                                                 main_bm_bh, group_bh,
 371                                                 first_new_cluster,
 372                                                 new_clusters);
 373         if (ret) {
 374                 mlog_errno(ret);
 375                 goto out_commit;
 376         }
 377
 378         ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
 379
 380 out_commit:
 381         ocfs2_commit_trans(osb, handle);
 382 out_unlock:
 383         if (group_bh)
 384                 brelse(group_bh);
 385
 386         if (main_bm_bh)
 387                 brelse(main_bm_bh);
 388
 389         ocfs2_inode_unlock(main_bm_inode, 1);
 390
 391 out_mutex:
 392         mutex_unlock(&main_bm_inode->i_mutex);
 393         iput(main_bm_inode);
 394
 395 out:
 396         mlog_exit_void();
 397         return ret;
 398 }