git.oblomov.eu Git - linux-2.6/blob - fs/ocfs2/super.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/utsname.h>
  32 #include <linux/init.h>
  33 #include <linux/random.h>
  34 #include <linux/statfs.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/socket.h>
  38 #include <linux/inet.h>
  39 #include <linux/parser.h>
  40 #include <linux/crc32.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/mount.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/quotaops.h>
  45
  46 #define MLOG_MASK_PREFIX ML_SUPER
  47 #include <cluster/masklog.h>
  48
  49 #include "ocfs2.h"
  50
  51 /* this should be the only file to include a version 1 header */
  52 #include "ocfs1_fs_compat.h"
  53
  54 #include "alloc.h"
  55 #include "blockcheck.h"
  56 #include "dlmglue.h"
  57 #include "export.h"
  58 #include "extent_map.h"
  59 #include "heartbeat.h"
  60 #include "inode.h"
  61 #include "journal.h"
  62 #include "localalloc.h"
  63 #include "namei.h"
  64 #include "slot_map.h"
  65 #include "super.h"
  66 #include "sysfile.h"
  67 #include "uptodate.h"
  68 #include "ver.h"
  69 #include "xattr.h"
  70 #include "quota.h"
  71
  72 #include "buffer_head_io.h"
  73
  74 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  75 struct kmem_cache *ocfs2_dquot_cachep;
  76 struct kmem_cache *ocfs2_qf_chunk_cachep;
  77
  78 /* OCFS2 needs to schedule several differnt types of work which
  79  * require cluster locking, disk I/O, recovery waits, etc. Since these
  80  * types of work tend to be heavy we avoid using the kernel events
  81  * workqueue and schedule on our own. */
  82 struct workqueue_struct *ocfs2_wq = NULL;
  83
  84 static struct dentry *ocfs2_debugfs_root = NULL;
  85
  86 MODULE_AUTHOR("Oracle");
  87 MODULE_LICENSE("GPL");
  88
  89 struct mount_options
  90 {
  91         unsigned long   commit_interval;
  92         unsigned long   mount_opt;
  93         unsigned int    atime_quantum;
  94         signed short    slot;
  95         unsigned int    localalloc_opt;
  96         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  97 };
  98
  99 static int ocfs2_parse_options(struct super_block *sb, char *options,
 100                                struct mount_options *mopt,
 101                                int is_remount);
 102 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 103 static void ocfs2_put_super(struct super_block *sb);
 104 static int ocfs2_mount_volume(struct super_block *sb);
 105 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 106 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 107 static int ocfs2_initialize_mem_caches(void);
 108 static void ocfs2_free_mem_caches(void);
 109 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 110
 111 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 112
 113 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 114
 115 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 116 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 117 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 118 static int ocfs2_check_volume(struct ocfs2_super *osb);
 119 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 120                                struct buffer_head *bh,
 121                                u32 sectsize);
 122 static int ocfs2_initialize_super(struct super_block *sb,
 123                                   struct buffer_head *bh,
 124                                   int sector_size);
 125 static int ocfs2_get_sector(struct super_block *sb,
 126                             struct buffer_head **bh,
 127                             int block,
 128                             int sect_size);
 129 static void ocfs2_write_super(struct super_block *sb);
 130 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 131 static void ocfs2_destroy_inode(struct inode *inode);
 132 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 133 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 134 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 135
 136 static const struct super_operations ocfs2_sops = {
 137         .statfs         = ocfs2_statfs,
 138         .alloc_inode    = ocfs2_alloc_inode,
 139         .destroy_inode  = ocfs2_destroy_inode,
 140         .drop_inode     = ocfs2_drop_inode,
 141         .clear_inode    = ocfs2_clear_inode,
 142         .delete_inode   = ocfs2_delete_inode,
 143         .sync_fs        = ocfs2_sync_fs,
 144         .write_super    = ocfs2_write_super,
 145         .put_super      = ocfs2_put_super,
 146         .remount_fs     = ocfs2_remount,
 147         .show_options   = ocfs2_show_options,
 148         .quota_read     = ocfs2_quota_read,
 149         .quota_write    = ocfs2_quota_write,
 150 };
 151
 152 enum {
 153         Opt_barrier,
 154         Opt_err_panic,
 155         Opt_err_ro,
 156         Opt_intr,
 157         Opt_nointr,
 158         Opt_hb_none,
 159         Opt_hb_local,
 160         Opt_data_ordered,
 161         Opt_data_writeback,
 162         Opt_atime_quantum,
 163         Opt_slot,
 164         Opt_commit,
 165         Opt_localalloc,
 166         Opt_localflocks,
 167         Opt_stack,
 168         Opt_user_xattr,
 169         Opt_nouser_xattr,
 170         Opt_inode64,
 171         Opt_acl,
 172         Opt_noacl,
 173         Opt_usrquota,
 174         Opt_grpquota,
 175         Opt_err,
 176 };
 177
 178 static const match_table_t tokens = {
 179         {Opt_barrier, "barrier=%u"},
 180         {Opt_err_panic, "errors=panic"},
 181         {Opt_err_ro, "errors=remount-ro"},
 182         {Opt_intr, "intr"},
 183         {Opt_nointr, "nointr"},
 184         {Opt_hb_none, OCFS2_HB_NONE},
 185         {Opt_hb_local, OCFS2_HB_LOCAL},
 186         {Opt_data_ordered, "data=ordered"},
 187         {Opt_data_writeback, "data=writeback"},
 188         {Opt_atime_quantum, "atime_quantum=%u"},
 189         {Opt_slot, "preferred_slot=%u"},
 190         {Opt_commit, "commit=%u"},
 191         {Opt_localalloc, "localalloc=%d"},
 192         {Opt_localflocks, "localflocks"},
 193         {Opt_stack, "cluster_stack=%s"},
 194         {Opt_user_xattr, "user_xattr"},
 195         {Opt_nouser_xattr, "nouser_xattr"},
 196         {Opt_inode64, "inode64"},
 197         {Opt_acl, "acl"},
 198         {Opt_noacl, "noacl"},
 199         {Opt_usrquota, "usrquota"},
 200         {Opt_grpquota, "grpquota"},
 201         {Opt_err, NULL}
 202 };
 203
 204 #ifdef CONFIG_DEBUG_FS
 205 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 206 {
 207         int out = 0;
 208         int i;
 209         struct ocfs2_cluster_connection *cconn = osb->cconn;
 210         struct ocfs2_recovery_map *rm = osb->recovery_map;
 211
 212         out += snprintf(buf + out, len - out,
 213                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 214                         "Device", osb->dev_str, osb->uuid_str,
 215                         osb->fs_generation, osb->vol_label);
 216
 217         out += snprintf(buf + out, len - out,
 218                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 219                         atomic_read(&osb->vol_state), osb->osb_flags);
 220
 221         out += snprintf(buf + out, len - out,
 222                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 223                         osb->sb->s_blocksize, osb->s_clustersize);
 224
 225         out += snprintf(buf + out, len - out,
 226                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 227                         "ROcompat: 0x%X\n",
 228                         "Features", osb->s_feature_compat,
 229                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 230
 231         out += snprintf(buf + out, len - out,
 232                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 233                         osb->s_mount_opt, osb->s_atime_quantum);
 234
 235         out += snprintf(buf + out, len - out,
 236                         "%10s => Stack: %s  Name: %*s  Version: %d.%d\n",
 237                         "Cluster",
 238                         (*osb->osb_cluster_stack == '\0' ?
 239                          "o2cb" : osb->osb_cluster_stack),
 240                         cconn->cc_namelen, cconn->cc_name,
 241                         cconn->cc_version.pv_major, cconn->cc_version.pv_minor);
 242
 243         spin_lock(&osb->dc_task_lock);
 244         out += snprintf(buf + out, len - out,
 245                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 246                         "WorkSeq: %lu\n", "DownCnvt",
 247                         task_pid_nr(osb->dc_task), osb->blocked_lock_count,
 248                         osb->dc_wake_sequence, osb->dc_work_sequence);
 249         spin_unlock(&osb->dc_task_lock);
 250
 251         spin_lock(&osb->osb_lock);
 252         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 253                         "Recovery",
 254                         (osb->recovery_thread_task ?
 255                          task_pid_nr(osb->recovery_thread_task) : -1));
 256         if (rm->rm_used == 0)
 257                 out += snprintf(buf + out, len - out, " None\n");
 258         else {
 259                 for (i = 0; i < rm->rm_used; i++)
 260                         out += snprintf(buf + out, len - out, " %d",
 261                                         rm->rm_entries[i]);
 262                 out += snprintf(buf + out, len - out, "\n");
 263         }
 264         spin_unlock(&osb->osb_lock);
 265
 266         out += snprintf(buf + out, len - out,
 267                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 268                         task_pid_nr(osb->commit_task), osb->osb_commit_interval,
 269                         atomic_read(&osb->needs_checkpoint));
 270
 271         out += snprintf(buf + out, len - out,
 272                         "%10s => State: %d  NumTxns: %d  TxnId: %lu\n",
 273                         "Journal", osb->journal->j_state,
 274                         atomic_read(&osb->journal->j_num_trans),
 275                         osb->journal->j_trans_id);
 276
 277         out += snprintf(buf + out, len - out,
 278                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 279                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 280                         "Stats",
 281                         atomic_read(&osb->alloc_stats.bitmap_data),
 282                         atomic_read(&osb->alloc_stats.local_data),
 283                         atomic_read(&osb->alloc_stats.bg_allocs),
 284                         atomic_read(&osb->alloc_stats.moves),
 285                         atomic_read(&osb->alloc_stats.bg_extends));
 286
 287         out += snprintf(buf + out, len - out,
 288                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 289                         "Default: %u bits\n",
 290                         "LocalAlloc", osb->local_alloc_state,
 291                         (unsigned long long)osb->la_last_gd,
 292                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 293
 294         spin_lock(&osb->osb_lock);
 295         out += snprintf(buf + out, len - out,
 296                         "%10s => Slot: %d  NumStolen: %d\n", "Steal",
 297                         osb->s_inode_steal_slot,
 298                         atomic_read(&osb->s_num_inodes_stolen));
 299         spin_unlock(&osb->osb_lock);
 300
 301         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 302                         "Slots", "Num", "RecoGen");
 303
 304         for (i = 0; i < osb->max_slots; ++i) {
 305                 out += snprintf(buf + out, len - out,
 306                                 "%10s  %c %3d  %10d\n",
 307                                 " ",
 308                                 (i == osb->slot_num ? '*' : ' '),
 309                                 i, osb->slot_recovery_generations[i]);
 310         }
 311
 312         return out;
 313 }
 314
 315 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 316 {
 317         struct ocfs2_super *osb = inode->i_private;
 318         char *buf = NULL;
 319
 320         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 321         if (!buf)
 322                 goto bail;
 323
 324         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 325
 326         file->private_data = buf;
 327
 328         return 0;
 329 bail:
 330         return -ENOMEM;
 331 }
 332
 333 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 334 {
 335         kfree(file->private_data);
 336         return 0;
 337 }
 338
 339 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 340                                 size_t nbytes, loff_t *ppos)
 341 {
 342         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 343                                        i_size_read(file->f_mapping->host));
 344 }
 345 #else
 346 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 347 {
 348         return 0;
 349 }
 350 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 351 {
 352         return 0;
 353 }
 354 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 355                                 size_t nbytes, loff_t *ppos)
 356 {
 357         return 0;
 358 }
 359 #endif  /* CONFIG_DEBUG_FS */
 360
 361 static struct file_operations ocfs2_osb_debug_fops = {
 362         .open =         ocfs2_osb_debug_open,
 363         .release =      ocfs2_debug_release,
 364         .read =         ocfs2_debug_read,
 365         .llseek =       generic_file_llseek,
 366 };
 367
 368 /*
 369  * write_super and sync_fs ripped right out of ext3.
 370  */
 371 static void ocfs2_write_super(struct super_block *sb)
 372 {
 373         if (mutex_trylock(&sb->s_lock) != 0)
 374                 BUG();
 375         sb->s_dirt = 0;
 376 }
 377
 378 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 379 {
 380         int status;
 381         tid_t target;
 382         struct ocfs2_super *osb = OCFS2_SB(sb);
 383
 384         sb->s_dirt = 0;
 385
 386         if (ocfs2_is_hard_readonly(osb))
 387                 return -EROFS;
 388
 389         if (wait) {
 390                 status = ocfs2_flush_truncate_log(osb);
 391                 if (status < 0)
 392                         mlog_errno(status);
 393         } else {
 394                 ocfs2_schedule_truncate_log_flush(osb, 0);
 395         }
 396
 397         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 398                                       &target)) {
 399                 if (wait)
 400                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 401                                              target);
 402         }
 403         return 0;
 404 }
 405
 406 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 407 {
 408         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 409             && (ino == USER_QUOTA_SYSTEM_INODE
 410                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 411                 return 0;
 412         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 413             && (ino == GROUP_QUOTA_SYSTEM_INODE
 414                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 415                 return 0;
 416         return 1;
 417 }
 418
 419 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 420 {
 421         struct inode *new = NULL;
 422         int status = 0;
 423         int i;
 424
 425         mlog_entry_void();
 426
 427         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 428         if (IS_ERR(new)) {
 429                 status = PTR_ERR(new);
 430                 mlog_errno(status);
 431                 goto bail;
 432         }
 433         osb->root_inode = new;
 434
 435         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 436         if (IS_ERR(new)) {
 437                 status = PTR_ERR(new);
 438                 mlog_errno(status);
 439                 goto bail;
 440         }
 441         osb->sys_root_inode = new;
 442
 443         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 444              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 445                 if (!ocfs2_need_system_inode(osb, i))
 446                         continue;
 447                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 448                 if (!new) {
 449                         ocfs2_release_system_inodes(osb);
 450                         status = -EINVAL;
 451                         mlog_errno(status);
 452                         /* FIXME: Should ERROR_RO_FS */
 453                         mlog(ML_ERROR, "Unable to load system inode %d, "
 454                              "possibly corrupt fs?", i);
 455                         goto bail;
 456                 }
 457                 // the array now has one ref, so drop this one
 458                 iput(new);
 459         }
 460
 461 bail:
 462         mlog_exit(status);
 463         return status;
 464 }
 465
 466 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 467 {
 468         struct inode *new = NULL;
 469         int status = 0;
 470         int i;
 471
 472         mlog_entry_void();
 473
 474         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 475              i < NUM_SYSTEM_INODES;
 476              i++) {
 477                 if (!ocfs2_need_system_inode(osb, i))
 478                         continue;
 479                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 480                 if (!new) {
 481                         ocfs2_release_system_inodes(osb);
 482                         status = -EINVAL;
 483                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 484                              status, i, osb->slot_num);
 485                         goto bail;
 486                 }
 487                 /* the array now has one ref, so drop this one */
 488                 iput(new);
 489         }
 490
 491 bail:
 492         mlog_exit(status);
 493         return status;
 494 }
 495
 496 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 497 {
 498         int i;
 499         struct inode *inode;
 500
 501         mlog_entry_void();
 502
 503         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 504                 inode = osb->system_inodes[i];
 505                 if (inode) {
 506                         iput(inode);
 507                         osb->system_inodes[i] = NULL;
 508                 }
 509         }
 510
 511         inode = osb->sys_root_inode;
 512         if (inode) {
 513                 iput(inode);
 514                 osb->sys_root_inode = NULL;
 515         }
 516
 517         inode = osb->root_inode;
 518         if (inode) {
 519                 iput(inode);
 520                 osb->root_inode = NULL;
 521         }
 522
 523         mlog_exit(0);
 524 }
 525
 526 /* We're allocating fs objects, use GFP_NOFS */
 527 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 528 {
 529         struct ocfs2_inode_info *oi;
 530
 531         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 532         if (!oi)
 533                 return NULL;
 534
 535         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 536         return &oi->vfs_inode;
 537 }
 538
 539 static void ocfs2_destroy_inode(struct inode *inode)
 540 {
 541         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 542 }
 543
 544 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 545                                                 unsigned int cbits)
 546 {
 547         unsigned int bytes = 1 << cbits;
 548         unsigned int trim = bytes;
 549         unsigned int bitshift = 32;
 550
 551         /*
 552          * i_size and all block offsets in ocfs2 are always 64 bits
 553          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 554          * 64 bit platforms, cluster size will be the limiting factor.
 555          */
 556
 557 #if BITS_PER_LONG == 32
 558 # if defined(CONFIG_LBD)
 559         BUILD_BUG_ON(sizeof(sector_t) != 8);
 560         /*
 561          * We might be limited by page cache size.
 562          */
 563         if (bytes > PAGE_CACHE_SIZE) {
 564                 bytes = PAGE_CACHE_SIZE;
 565                 trim = 1;
 566                 /*
 567                  * Shift by 31 here so that we don't get larger than
 568                  * MAX_LFS_FILESIZE
 569                  */
 570                 bitshift = 31;
 571         }
 572 # else
 573         /*
 574          * We are limited by the size of sector_t. Use block size, as
 575          * that's what we expose to the VFS.
 576          */
 577         bytes = 1 << bbits;
 578         trim = 1;
 579         bitshift = 31;
 580 # endif
 581 #endif
 582
 583         /*
 584          * Trim by a whole cluster when we can actually approach the
 585          * on-disk limits. Otherwise we can overflow i_clusters when
 586          * an extent start is at the max offset.
 587          */
 588         return (((unsigned long long)bytes) << bitshift) - trim;
 589 }
 590
 591 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 592 {
 593         int incompat_features;
 594         int ret = 0;
 595         struct mount_options parsed_options;
 596         struct ocfs2_super *osb = OCFS2_SB(sb);
 597
 598         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 599                 ret = -EINVAL;
 600                 goto out;
 601         }
 602
 603         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 604             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 605                 ret = -EINVAL;
 606                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 607                 goto out;
 608         }
 609
 610         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 611             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 612                 ret = -EINVAL;
 613                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 614                 goto out;
 615         }
 616
 617         /* Probably don't want this on remount; it might
 618          * mess with other nodes */
 619         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 620             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 621                 ret = -EINVAL;
 622                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 623                 goto out;
 624         }
 625
 626         /* We're going to/from readonly mode. */
 627         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 628                 /* Disable quota accounting before remounting RO */
 629                 if (*flags & MS_RDONLY) {
 630                         ret = ocfs2_susp_quotas(osb, 0);
 631                         if (ret < 0)
 632                                 goto out;
 633                 }
 634                 /* Lock here so the check of HARD_RO and the potential
 635                  * setting of SOFT_RO is atomic. */
 636                 spin_lock(&osb->osb_lock);
 637                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 638                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 639                         ret = -EROFS;
 640                         goto unlock_osb;
 641                 }
 642
 643                 if (*flags & MS_RDONLY) {
 644                         mlog(0, "Going to ro mode.\n");
 645                         sb->s_flags |= MS_RDONLY;
 646                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 647                 } else {
 648                         mlog(0, "Making ro filesystem writeable.\n");
 649
 650                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 651                                 mlog(ML_ERROR, "Cannot remount RDWR "
 652                                      "filesystem due to previous errors.\n");
 653                                 ret = -EROFS;
 654                                 goto unlock_osb;
 655                         }
 656                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 657                         if (incompat_features) {
 658                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 659                                      "of unsupported optional features "
 660                                      "(%x).\n", incompat_features);
 661                                 ret = -EINVAL;
 662                                 goto unlock_osb;
 663                         }
 664                         sb->s_flags &= ~MS_RDONLY;
 665                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 666                 }
 667 unlock_osb:
 668                 spin_unlock(&osb->osb_lock);
 669                 /* Enable quota accounting after remounting RW */
 670                 if (!ret && !(*flags & MS_RDONLY)) {
 671                         if (sb_any_quota_suspended(sb))
 672                                 ret = ocfs2_susp_quotas(osb, 1);
 673                         else
 674                                 ret = ocfs2_enable_quotas(osb);
 675                         if (ret < 0) {
 676                                 /* Return back changes... */
 677                                 spin_lock(&osb->osb_lock);
 678                                 sb->s_flags |= MS_RDONLY;
 679                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 680                                 spin_unlock(&osb->osb_lock);
 681                                 goto out;
 682                         }
 683                 }
 684         }
 685
 686         if (!ret) {
 687                 /* Only save off the new mount options in case of a successful
 688                  * remount. */
 689                 if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 690                         parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 691                 osb->s_mount_opt = parsed_options.mount_opt;
 692                 osb->s_atime_quantum = parsed_options.atime_quantum;
 693                 osb->preferred_slot = parsed_options.slot;
 694                 if (parsed_options.commit_interval)
 695                         osb->osb_commit_interval = parsed_options.commit_interval;
 696
 697                 if (!ocfs2_is_hard_readonly(osb))
 698                         ocfs2_set_journal_params(osb);
 699         }
 700 out:
 701         return ret;
 702 }
 703
 704 static int ocfs2_sb_probe(struct super_block *sb,
 705                           struct buffer_head **bh,
 706                           int *sector_size)
 707 {
 708         int status, tmpstat;
 709         struct ocfs1_vol_disk_hdr *hdr;
 710         struct ocfs2_dinode *di;
 711         int blksize;
 712
 713         *bh = NULL;
 714
 715         /* may be > 512 */
 716         *sector_size = bdev_logical_block_size(sb->s_bdev);
 717         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 718                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 719                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 720                 status = -EINVAL;
 721                 goto bail;
 722         }
 723
 724         /* Can this really happen? */
 725         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 726                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 727
 728         /* check block zero for old format */
 729         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 730         if (status < 0) {
 731                 mlog_errno(status);
 732                 goto bail;
 733         }
 734         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 735         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 736                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 737                      hdr->major_version, hdr->minor_version);
 738                 status = -EINVAL;
 739         }
 740         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 741                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 742                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 743                      hdr->signature);
 744                 status = -EINVAL;
 745         }
 746         brelse(*bh);
 747         *bh = NULL;
 748         if (status < 0) {
 749                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 750                      "upgraded before mounting with ocfs v2\n");
 751                 goto bail;
 752         }
 753
 754         /*
 755          * Now check at magic offset for 512, 1024, 2048, 4096
 756          * blocksizes.  4096 is the maximum blocksize because it is
 757          * the minimum clustersize.
 758          */
 759         status = -EINVAL;
 760         for (blksize = *sector_size;
 761              blksize <= OCFS2_MAX_BLOCKSIZE;
 762              blksize <<= 1) {
 763                 tmpstat = ocfs2_get_sector(sb, bh,
 764                                            OCFS2_SUPER_BLOCK_BLKNO,
 765                                            blksize);
 766                 if (tmpstat < 0) {
 767                         status = tmpstat;
 768                         mlog_errno(status);
 769                         goto bail;
 770                 }
 771                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 772                 status = ocfs2_verify_volume(di, *bh, blksize);
 773                 if (status >= 0)
 774                         goto bail;
 775                 brelse(*bh);
 776                 *bh = NULL;
 777                 if (status != -EAGAIN)
 778                         break;
 779         }
 780
 781 bail:
 782         return status;
 783 }
 784
 785 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 786 {
 787         if (ocfs2_mount_local(osb)) {
 788                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 789                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 790                              "mounted device.\n");
 791                         return -EINVAL;
 792                 }
 793         }
 794
 795         if (ocfs2_userspace_stack(osb)) {
 796                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 797                         mlog(ML_ERROR, "Userspace stack expected, but "
 798                              "o2cb heartbeat arguments passed to mount\n");
 799                         return -EINVAL;
 800                 }
 801         }
 802
 803         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 804                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 805                     !ocfs2_userspace_stack(osb)) {
 806                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 807                              "a read-write clustered device.\n");
 808                         return -EINVAL;
 809                 }
 810         }
 811
 812         return 0;
 813 }
 814
 815 /*
 816  * If we're using a userspace stack, mount should have passed
 817  * a name that matches the disk.  If not, mount should not
 818  * have passed a stack.
 819  */
 820 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 821                                         struct mount_options *mopt)
 822 {
 823         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 824                 mlog(ML_ERROR,
 825                      "cluster stack passed to mount, but this filesystem "
 826                      "does not support it\n");
 827                 return -EINVAL;
 828         }
 829
 830         if (ocfs2_userspace_stack(osb) &&
 831             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 832                     OCFS2_STACK_LABEL_LEN)) {
 833                 mlog(ML_ERROR,
 834                      "cluster stack passed to mount (\"%s\") does not "
 835                      "match the filesystem (\"%s\")\n",
 836                      mopt->cluster_stack,
 837                      osb->osb_cluster_stack);
 838                 return -EINVAL;
 839         }
 840
 841         return 0;
 842 }
 843
 844 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 845 {
 846         int type;
 847         struct super_block *sb = osb->sb;
 848         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 849                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 850         int status = 0;
 851
 852         for (type = 0; type < MAXQUOTAS; type++) {
 853                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 854                         continue;
 855                 if (unsuspend)
 856                         status = vfs_quota_enable(
 857                                         sb_dqopt(sb)->files[type],
 858                                         type, QFMT_OCFS2,
 859                                         DQUOT_SUSPENDED);
 860                 else
 861                         status = vfs_quota_disable(sb, type,
 862                                                    DQUOT_SUSPENDED);
 863                 if (status < 0)
 864                         break;
 865         }
 866         if (status < 0)
 867                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 868                      "remount (error = %d).\n", status);
 869         return status;
 870 }
 871
 872 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 873 {
 874         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 875         struct super_block *sb = osb->sb;
 876         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 877                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 878         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 879                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 880         int status;
 881         int type;
 882
 883         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 884         for (type = 0; type < MAXQUOTAS; type++) {
 885                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 886                         continue;
 887                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 888                                                         osb->slot_num);
 889                 if (!inode[type]) {
 890                         status = -ENOENT;
 891                         goto out_quota_off;
 892                 }
 893                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 894                                                 DQUOT_USAGE_ENABLED);
 895                 if (status < 0)
 896                         goto out_quota_off;
 897         }
 898
 899         for (type = 0; type < MAXQUOTAS; type++)
 900                 iput(inode[type]);
 901         return 0;
 902 out_quota_off:
 903         ocfs2_disable_quotas(osb);
 904         for (type = 0; type < MAXQUOTAS; type++)
 905                 iput(inode[type]);
 906         mlog_errno(status);
 907         return status;
 908 }
 909
 910 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 911 {
 912         int type;
 913         struct inode *inode;
 914         struct super_block *sb = osb->sb;
 915
 916         /* We mostly ignore errors in this function because there's not much
 917          * we can do when we see them */
 918         for (type = 0; type < MAXQUOTAS; type++) {
 919                 if (!sb_has_quota_loaded(sb, type))
 920                         continue;
 921                 inode = igrab(sb->s_dquot.files[type]);
 922                 /* Turn off quotas. This will remove all dquot structures from
 923                  * memory and so they will be automatically synced to global
 924                  * quota files */
 925                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 926                                             DQUOT_LIMITS_ENABLED);
 927                 if (!inode)
 928                         continue;
 929                 iput(inode);
 930         }
 931 }
 932
 933 /* Handle quota on quotactl */
 934 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 935                           char *path, int remount)
 936 {
 937         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 938                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 939
 940         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 941                 return -EINVAL;
 942
 943         if (remount)
 944                 return 0;       /* Just ignore it has been handled in
 945                                  * ocfs2_remount() */
 946         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 947                                     format_id, DQUOT_LIMITS_ENABLED);
 948 }
 949
 950 /* Handle quota off quotactl */
 951 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 952 {
 953         if (remount)
 954                 return 0;       /* Ignore now and handle later in
 955                                  * ocfs2_remount() */
 956         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 957 }
 958
 959 static struct quotactl_ops ocfs2_quotactl_ops = {
 960         .quota_on       = ocfs2_quota_on,
 961         .quota_off      = ocfs2_quota_off,
 962         .quota_sync     = vfs_quota_sync,
 963         .get_info       = vfs_get_dqinfo,
 964         .set_info       = vfs_set_dqinfo,
 965         .get_dqblk      = vfs_get_dqblk,
 966         .set_dqblk      = vfs_set_dqblk,
 967 };
 968
 969 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 970 {
 971         struct dentry *root;
 972         int status, sector_size;
 973         struct mount_options parsed_options;
 974         struct inode *inode = NULL;
 975         struct ocfs2_super *osb = NULL;
 976         struct buffer_head *bh = NULL;
 977         char nodestr[8];
 978
 979         mlog_entry("%p, %p, %i", sb, data, silent);
 980
 981         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 982                 status = -EINVAL;
 983                 goto read_super_error;
 984         }
 985
 986         /* probe for superblock */
 987         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 988         if (status < 0) {
 989                 mlog(ML_ERROR, "superblock probe failed!\n");
 990                 goto read_super_error;
 991         }
 992
 993         status = ocfs2_initialize_super(sb, bh, sector_size);
 994         osb = OCFS2_SB(sb);
 995         if (status < 0) {
 996                 mlog_errno(status);
 997                 goto read_super_error;
 998         }
 999         brelse(bh);
1000         bh = NULL;
1001
1002         if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
1003                 parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1004
1005         osb->s_mount_opt = parsed_options.mount_opt;
1006         osb->s_atime_quantum = parsed_options.atime_quantum;
1007         osb->preferred_slot = parsed_options.slot;
1008         osb->osb_commit_interval = parsed_options.commit_interval;
1009         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1010         osb->local_alloc_bits = osb->local_alloc_default_bits;
1011         if (osb->s_mount_opt & OCFS2_MOUNT_USRQUOTA &&
1012             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1013                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1014                 status = -EINVAL;
1015                 mlog(ML_ERROR, "User quotas were requested, but this "
1016                      "filesystem does not have the feature enabled.\n");
1017                 goto read_super_error;
1018         }
1019         if (osb->s_mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1020             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1021                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1022                 status = -EINVAL;
1023                 mlog(ML_ERROR, "Group quotas were requested, but this "
1024                      "filesystem does not have the feature enabled.\n");
1025                 goto read_super_error;
1026         }
1027
1028         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1029         if (status)
1030                 goto read_super_error;
1031
1032         sb->s_magic = OCFS2_SUPER_MAGIC;
1033
1034         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1035                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1036
1037         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1038          * heartbeat=none */
1039         if (bdev_read_only(sb->s_bdev)) {
1040                 if (!(sb->s_flags & MS_RDONLY)) {
1041                         status = -EACCES;
1042                         mlog(ML_ERROR, "Readonly device detected but readonly "
1043                              "mount was not specified.\n");
1044                         goto read_super_error;
1045                 }
1046
1047                 /* You should not be able to start a local heartbeat
1048                  * on a readonly device. */
1049                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1050                         status = -EROFS;
1051                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1052                              "device.\n");
1053                         goto read_super_error;
1054                 }
1055
1056                 status = ocfs2_check_journals_nolocks(osb);
1057                 if (status < 0) {
1058                         if (status == -EROFS)
1059                                 mlog(ML_ERROR, "Recovery required on readonly "
1060                                      "file system, but write access is "
1061                                      "unavailable.\n");
1062                         else
1063                                 mlog_errno(status);
1064                         goto read_super_error;
1065                 }
1066
1067                 ocfs2_set_ro_flag(osb, 1);
1068
1069                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1070                        "services will be utilized for this mount. Recovery "
1071                        "will be skipped.\n");
1072         }
1073
1074         if (!ocfs2_is_hard_readonly(osb)) {
1075                 if (sb->s_flags & MS_RDONLY)
1076                         ocfs2_set_ro_flag(osb, 0);
1077         }
1078
1079         status = ocfs2_verify_heartbeat(osb);
1080         if (status < 0) {
1081                 mlog_errno(status);
1082                 goto read_super_error;
1083         }
1084
1085         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1086                                                  ocfs2_debugfs_root);
1087         if (!osb->osb_debug_root) {
1088                 status = -EINVAL;
1089                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1090                 goto read_super_error;
1091         }
1092
1093         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1094                                             osb->osb_debug_root,
1095                                             osb,
1096                                             &ocfs2_osb_debug_fops);
1097         if (!osb->osb_ctxt) {
1098                 status = -EINVAL;
1099                 mlog_errno(status);
1100                 goto read_super_error;
1101         }
1102
1103         status = ocfs2_mount_volume(sb);
1104         if (osb->root_inode)
1105                 inode = igrab(osb->root_inode);
1106
1107         if (status < 0)
1108                 goto read_super_error;
1109
1110         if (!inode) {
1111                 status = -EIO;
1112                 mlog_errno(status);
1113                 goto read_super_error;
1114         }
1115
1116         root = d_alloc_root(inode);
1117         if (!root) {
1118                 status = -ENOMEM;
1119                 mlog_errno(status);
1120                 goto read_super_error;
1121         }
1122
1123         sb->s_root = root;
1124
1125         ocfs2_complete_mount_recovery(osb);
1126
1127         if (ocfs2_mount_local(osb))
1128                 snprintf(nodestr, sizeof(nodestr), "local");
1129         else
1130                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1131
1132         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1133                "with %s data mode.\n",
1134                osb->dev_str, nodestr, osb->slot_num,
1135                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1136                "ordered");
1137
1138         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1139         wake_up(&osb->osb_mount_event);
1140
1141         /* Now we can initialize quotas because we can afford to wait
1142          * for cluster locks recovery now. That also means that truncation
1143          * log recovery can happen but that waits for proper quota setup */
1144         if (!(sb->s_flags & MS_RDONLY)) {
1145                 status = ocfs2_enable_quotas(osb);
1146                 if (status < 0) {
1147                         /* We have to err-out specially here because
1148                          * s_root is already set */
1149                         mlog_errno(status);
1150                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1151                         wake_up(&osb->osb_mount_event);
1152                         mlog_exit(status);
1153                         return status;
1154                 }
1155         }
1156
1157         ocfs2_complete_quota_recovery(osb);
1158
1159         /* Now we wake up again for processes waiting for quotas */
1160         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1161         wake_up(&osb->osb_mount_event);
1162
1163         mlog_exit(status);
1164         return status;
1165
1166 read_super_error:
1167         brelse(bh);
1168
1169         if (inode)
1170                 iput(inode);
1171
1172         if (osb) {
1173                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1174                 wake_up(&osb->osb_mount_event);
1175                 ocfs2_dismount_volume(sb, 1);
1176         }
1177
1178         mlog_exit(status);
1179         return status;
1180 }
1181
1182 static int ocfs2_get_sb(struct file_system_type *fs_type,
1183                         int flags,
1184                         const char *dev_name,
1185                         void *data,
1186                         struct vfsmount *mnt)
1187 {
1188         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1189                            mnt);
1190 }
1191
1192 static struct file_system_type ocfs2_fs_type = {
1193         .owner          = THIS_MODULE,
1194         .name           = "ocfs2",
1195         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1196                                         * the fs? */
1197         .kill_sb        = kill_block_super, /* set to the generic one
1198                                              * right now, but do we
1199                                              * need to change that? */
1200         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1201         .next           = NULL
1202 };
1203
1204 static int ocfs2_parse_options(struct super_block *sb,
1205                                char *options,
1206                                struct mount_options *mopt,
1207                                int is_remount)
1208 {
1209         int status;
1210         char *p;
1211
1212         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1213                    options ? options : "(none)");
1214
1215         mopt->commit_interval = 0;
1216         mopt->mount_opt = 0;
1217         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1218         mopt->slot = OCFS2_INVALID_SLOT;
1219         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1220         mopt->cluster_stack[0] = '\0';
1221
1222         if (!options) {
1223                 status = 1;
1224                 goto bail;
1225         }
1226
1227         while ((p = strsep(&options, ",")) != NULL) {
1228                 int token, option;
1229                 substring_t args[MAX_OPT_ARGS];
1230
1231                 if (!*p)
1232                         continue;
1233
1234                 token = match_token(p, tokens, args);
1235                 switch (token) {
1236                 case Opt_hb_local:
1237                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1238                         break;
1239                 case Opt_hb_none:
1240                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1241                         break;
1242                 case Opt_barrier:
1243                         if (match_int(&args[0], &option)) {
1244                                 status = 0;
1245                                 goto bail;
1246                         }
1247                         if (option)
1248                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1249                         else
1250                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1251                         break;
1252                 case Opt_intr:
1253                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1254                         break;
1255                 case Opt_nointr:
1256                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1257                         break;
1258                 case Opt_err_panic:
1259                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1260                         break;
1261                 case Opt_err_ro:
1262                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1263                         break;
1264                 case Opt_data_ordered:
1265                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1266                         break;
1267                 case Opt_data_writeback:
1268                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1269                         break;
1270                 case Opt_user_xattr:
1271                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1272                         break;
1273                 case Opt_nouser_xattr:
1274                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1275                         break;
1276                 case Opt_atime_quantum:
1277                         if (match_int(&args[0], &option)) {
1278                                 status = 0;
1279                                 goto bail;
1280                         }
1281                         if (option >= 0)
1282                                 mopt->atime_quantum = option;
1283                         break;
1284                 case Opt_slot:
1285                         option = 0;
1286                         if (match_int(&args[0], &option)) {
1287                                 status = 0;
1288                                 goto bail;
1289                         }
1290                         if (option)
1291                                 mopt->slot = (s16)option;
1292                         break;
1293                 case Opt_commit:
1294                         option = 0;
1295                         if (match_int(&args[0], &option)) {
1296                                 status = 0;
1297                                 goto bail;
1298                         }
1299                         if (option < 0)
1300                                 return 0;
1301                         if (option == 0)
1302                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1303                         mopt->commit_interval = HZ * option;
1304                         break;
1305                 case Opt_localalloc:
1306                         option = 0;
1307                         if (match_int(&args[0], &option)) {
1308                                 status = 0;
1309                                 goto bail;
1310                         }
1311                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1312                                 mopt->localalloc_opt = option;
1313                         break;
1314                 case Opt_localflocks:
1315                         /*
1316                          * Changing this during remount could race
1317                          * flock() requests, or "unbalance" existing
1318                          * ones (e.g., a lock is taken in one mode but
1319                          * dropped in the other). If users care enough
1320                          * to flip locking modes during remount, we
1321                          * could add a "local" flag to individual
1322                          * flock structures for proper tracking of
1323                          * state.
1324                          */
1325                         if (!is_remount)
1326                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1327                         break;
1328                 case Opt_stack:
1329                         /* Check both that the option we were passed
1330                          * is of the right length and that it is a proper
1331                          * string of the right length.
1332                          */
1333                         if (((args[0].to - args[0].from) !=
1334                              OCFS2_STACK_LABEL_LEN) ||
1335                             (strnlen(args[0].from,
1336                                      OCFS2_STACK_LABEL_LEN) !=
1337                              OCFS2_STACK_LABEL_LEN)) {
1338                                 mlog(ML_ERROR,
1339                                      "Invalid cluster_stack option\n");
1340                                 status = 0;
1341                                 goto bail;
1342                         }
1343                         memcpy(mopt->cluster_stack, args[0].from,
1344                                OCFS2_STACK_LABEL_LEN);
1345                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1346                         break;
1347                 case Opt_inode64:
1348                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1349                         break;
1350                 case Opt_usrquota:
1351                         /* We check only on remount, otherwise features
1352                          * aren't yet initialized. */
1353                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1354                             OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1355                                 mlog(ML_ERROR, "User quota requested but "
1356                                      "filesystem feature is not set\n");
1357                                 status = 0;
1358                                 goto bail;
1359                         }
1360                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1361                         break;
1362                 case Opt_grpquota:
1363                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1364                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1365                                 mlog(ML_ERROR, "Group quota requested but "
1366                                      "filesystem feature is not set\n");
1367                                 status = 0;
1368                                 goto bail;
1369                         }
1370                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1371                         break;
1372 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1373                 case Opt_acl:
1374                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1375                         break;
1376                 case Opt_noacl:
1377                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1378                         break;
1379 #else
1380                 case Opt_acl:
1381                 case Opt_noacl:
1382                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
1383                         break;
1384 #endif
1385                 default:
1386                         mlog(ML_ERROR,
1387                              "Unrecognized mount option \"%s\" "
1388                              "or missing value\n", p);
1389                         status = 0;
1390                         goto bail;
1391                 }
1392         }
1393
1394         status = 1;
1395
1396 bail:
1397         mlog_exit(status);
1398         return status;
1399 }
1400
1401 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1402 {
1403         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1404         unsigned long opts = osb->s_mount_opt;
1405         unsigned int local_alloc_megs;
1406
1407         if (opts & OCFS2_MOUNT_HB_LOCAL)
1408                 seq_printf(s, ",_netdev,heartbeat=local");
1409         else
1410                 seq_printf(s, ",heartbeat=none");
1411
1412         if (opts & OCFS2_MOUNT_NOINTR)
1413                 seq_printf(s, ",nointr");
1414
1415         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1416                 seq_printf(s, ",data=writeback");
1417         else
1418                 seq_printf(s, ",data=ordered");
1419
1420         if (opts & OCFS2_MOUNT_BARRIER)
1421                 seq_printf(s, ",barrier=1");
1422
1423         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1424                 seq_printf(s, ",errors=panic");
1425         else
1426                 seq_printf(s, ",errors=remount-ro");
1427
1428         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1429                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1430
1431         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1432                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1433
1434         if (osb->osb_commit_interval)
1435                 seq_printf(s, ",commit=%u",
1436                            (unsigned) (osb->osb_commit_interval / HZ));
1437
1438         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1439         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1440                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1441
1442         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1443                 seq_printf(s, ",localflocks,");
1444
1445         if (osb->osb_cluster_stack[0])
1446                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1447                            osb->osb_cluster_stack);
1448         if (opts & OCFS2_MOUNT_USRQUOTA)
1449                 seq_printf(s, ",usrquota");
1450         if (opts & OCFS2_MOUNT_GRPQUOTA)
1451                 seq_printf(s, ",grpquota");
1452
1453         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1454                 seq_printf(s, ",nouser_xattr");
1455         else
1456                 seq_printf(s, ",user_xattr");
1457
1458         if (opts & OCFS2_MOUNT_INODE64)
1459                 seq_printf(s, ",inode64");
1460
1461 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1462         if (opts & OCFS2_MOUNT_POSIX_ACL)
1463                 seq_printf(s, ",acl");
1464         else
1465                 seq_printf(s, ",noacl");
1466 #endif
1467
1468         return 0;
1469 }
1470
1471 static int __init ocfs2_init(void)
1472 {
1473         int status;
1474
1475         mlog_entry_void();
1476
1477         ocfs2_print_version();
1478
1479         status = init_ocfs2_uptodate_cache();
1480         if (status < 0) {
1481                 mlog_errno(status);
1482                 goto leave;
1483         }
1484
1485         status = ocfs2_initialize_mem_caches();
1486         if (status < 0) {
1487                 mlog_errno(status);
1488                 goto leave;
1489         }
1490
1491         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1492         if (!ocfs2_wq) {
1493                 status = -ENOMEM;
1494                 goto leave;
1495         }
1496
1497         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1498         if (!ocfs2_debugfs_root) {
1499                 status = -EFAULT;
1500                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1501         }
1502
1503         status = ocfs2_quota_setup();
1504         if (status)
1505                 goto leave;
1506
1507         ocfs2_set_locking_protocol();
1508
1509         status = register_quota_format(&ocfs2_quota_format);
1510 leave:
1511         if (status < 0) {
1512                 ocfs2_quota_shutdown();
1513                 ocfs2_free_mem_caches();
1514                 exit_ocfs2_uptodate_cache();
1515         }
1516
1517         mlog_exit(status);
1518
1519         if (status >= 0) {
1520                 return register_filesystem(&ocfs2_fs_type);
1521         } else
1522                 return -1;
1523 }
1524
1525 static void __exit ocfs2_exit(void)
1526 {
1527         mlog_entry_void();
1528
1529         ocfs2_quota_shutdown();
1530
1531         if (ocfs2_wq) {
1532                 flush_workqueue(ocfs2_wq);
1533                 destroy_workqueue(ocfs2_wq);
1534         }
1535
1536         unregister_quota_format(&ocfs2_quota_format);
1537
1538         debugfs_remove(ocfs2_debugfs_root);
1539
1540         ocfs2_free_mem_caches();
1541
1542         unregister_filesystem(&ocfs2_fs_type);
1543
1544         exit_ocfs2_uptodate_cache();
1545
1546         mlog_exit_void();
1547 }
1548
1549 static void ocfs2_put_super(struct super_block *sb)
1550 {
1551         mlog_entry("(0x%p)\n", sb);
1552
1553         ocfs2_sync_blockdev(sb);
1554         ocfs2_dismount_volume(sb, 0);
1555
1556         mlog_exit_void();
1557 }
1558
1559 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1560 {
1561         struct ocfs2_super *osb;
1562         u32 numbits, freebits;
1563         int status;
1564         struct ocfs2_dinode *bm_lock;
1565         struct buffer_head *bh = NULL;
1566         struct inode *inode = NULL;
1567
1568         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1569
1570         osb = OCFS2_SB(dentry->d_sb);
1571
1572         inode = ocfs2_get_system_file_inode(osb,
1573                                             GLOBAL_BITMAP_SYSTEM_INODE,
1574                                             OCFS2_INVALID_SLOT);
1575         if (!inode) {
1576                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1577                 status = -EIO;
1578                 goto bail;
1579         }
1580
1581         status = ocfs2_inode_lock(inode, &bh, 0);
1582         if (status < 0) {
1583                 mlog_errno(status);
1584                 goto bail;
1585         }
1586
1587         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1588
1589         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1590         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1591
1592         buf->f_type = OCFS2_SUPER_MAGIC;
1593         buf->f_bsize = dentry->d_sb->s_blocksize;
1594         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1595         buf->f_blocks = ((sector_t) numbits) *
1596                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1597         buf->f_bfree = ((sector_t) freebits) *
1598                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1599         buf->f_bavail = buf->f_bfree;
1600         buf->f_files = numbits;
1601         buf->f_ffree = freebits;
1602
1603         brelse(bh);
1604
1605         ocfs2_inode_unlock(inode, 0);
1606         status = 0;
1607 bail:
1608         if (inode)
1609                 iput(inode);
1610
1611         mlog_exit(status);
1612
1613         return status;
1614 }
1615
1616 static void ocfs2_inode_init_once(void *data)
1617 {
1618         struct ocfs2_inode_info *oi = data;
1619
1620         oi->ip_flags = 0;
1621         oi->ip_open_count = 0;
1622         spin_lock_init(&oi->ip_lock);
1623         ocfs2_extent_map_init(&oi->vfs_inode);
1624         INIT_LIST_HEAD(&oi->ip_io_markers);
1625         oi->ip_created_trans = 0;
1626         oi->ip_last_trans = 0;
1627         oi->ip_dir_start_lookup = 0;
1628
1629         init_rwsem(&oi->ip_alloc_sem);
1630         init_rwsem(&oi->ip_xattr_sem);
1631         mutex_init(&oi->ip_io_mutex);
1632
1633         oi->ip_blkno = 0ULL;
1634         oi->ip_clusters = 0;
1635
1636         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1637         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1638         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1639
1640         ocfs2_metadata_cache_init(&oi->vfs_inode);
1641
1642         inode_init_once(&oi->vfs_inode);
1643 }
1644
1645 static int ocfs2_initialize_mem_caches(void)
1646 {
1647         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1648                                        sizeof(struct ocfs2_inode_info),
1649                                        0,
1650                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1651                                                 SLAB_MEM_SPREAD),
1652                                        ocfs2_inode_init_once);
1653         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1654                                         sizeof(struct ocfs2_dquot),
1655                                         0,
1656                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1657                                                 SLAB_MEM_SPREAD),
1658                                         NULL);
1659         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1660                                         sizeof(struct ocfs2_quota_chunk),
1661                                         0,
1662                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1663                                         NULL);
1664         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1665             !ocfs2_qf_chunk_cachep) {
1666                 if (ocfs2_inode_cachep)
1667                         kmem_cache_destroy(ocfs2_inode_cachep);
1668                 if (ocfs2_dquot_cachep)
1669                         kmem_cache_destroy(ocfs2_dquot_cachep);
1670                 if (ocfs2_qf_chunk_cachep)
1671                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1672                 return -ENOMEM;
1673         }
1674
1675         return 0;
1676 }
1677
1678 static void ocfs2_free_mem_caches(void)
1679 {
1680         if (ocfs2_inode_cachep)
1681                 kmem_cache_destroy(ocfs2_inode_cachep);
1682         ocfs2_inode_cachep = NULL;
1683
1684         if (ocfs2_dquot_cachep)
1685                 kmem_cache_destroy(ocfs2_dquot_cachep);
1686         ocfs2_dquot_cachep = NULL;
1687
1688         if (ocfs2_qf_chunk_cachep)
1689                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1690         ocfs2_qf_chunk_cachep = NULL;
1691 }
1692
1693 static int ocfs2_get_sector(struct super_block *sb,
1694                             struct buffer_head **bh,
1695                             int block,
1696                             int sect_size)
1697 {
1698         if (!sb_set_blocksize(sb, sect_size)) {
1699                 mlog(ML_ERROR, "unable to set blocksize\n");
1700                 return -EIO;
1701         }
1702
1703         *bh = sb_getblk(sb, block);
1704         if (!*bh) {
1705                 mlog_errno(-EIO);
1706                 return -EIO;
1707         }
1708         lock_buffer(*bh);
1709         if (!buffer_dirty(*bh))
1710                 clear_buffer_uptodate(*bh);
1711         unlock_buffer(*bh);
1712         ll_rw_block(READ, 1, bh);
1713         wait_on_buffer(*bh);
1714         if (!buffer_uptodate(*bh)) {
1715                 mlog_errno(-EIO);
1716                 brelse(*bh);
1717                 *bh = NULL;
1718                 return -EIO;
1719         }
1720
1721         return 0;
1722 }
1723
1724 static int ocfs2_mount_volume(struct super_block *sb)
1725 {
1726         int status = 0;
1727         int unlock_super = 0;
1728         struct ocfs2_super *osb = OCFS2_SB(sb);
1729
1730         mlog_entry_void();
1731
1732         if (ocfs2_is_hard_readonly(osb))
1733                 goto leave;
1734
1735         status = ocfs2_dlm_init(osb);
1736         if (status < 0) {
1737                 mlog_errno(status);
1738                 goto leave;
1739         }
1740
1741         status = ocfs2_super_lock(osb, 1);
1742         if (status < 0) {
1743                 mlog_errno(status);
1744                 goto leave;
1745         }
1746         unlock_super = 1;
1747
1748         /* This will load up the node map and add ourselves to it. */
1749         status = ocfs2_find_slot(osb);
1750         if (status < 0) {
1751                 mlog_errno(status);
1752                 goto leave;
1753         }
1754
1755         /* load all node-local system inodes */
1756         status = ocfs2_init_local_system_inodes(osb);
1757         if (status < 0) {
1758                 mlog_errno(status);
1759                 goto leave;
1760         }
1761
1762         status = ocfs2_check_volume(osb);
1763         if (status < 0) {
1764                 mlog_errno(status);
1765                 goto leave;
1766         }
1767
1768         status = ocfs2_truncate_log_init(osb);
1769         if (status < 0) {
1770                 mlog_errno(status);
1771                 goto leave;
1772         }
1773
1774         if (ocfs2_mount_local(osb))
1775                 goto leave;
1776
1777 leave:
1778         if (unlock_super)
1779                 ocfs2_super_unlock(osb, 1);
1780
1781         mlog_exit(status);
1782         return status;
1783 }
1784
1785 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1786 {
1787         int tmp, hangup_needed = 0;
1788         struct ocfs2_super *osb = NULL;
1789         char nodestr[8];
1790
1791         mlog_entry("(0x%p)\n", sb);
1792
1793         BUG_ON(!sb);
1794         osb = OCFS2_SB(sb);
1795         BUG_ON(!osb);
1796
1797         debugfs_remove(osb->osb_ctxt);
1798
1799         ocfs2_disable_quotas(osb);
1800
1801         ocfs2_shutdown_local_alloc(osb);
1802
1803         ocfs2_truncate_log_shutdown(osb);
1804
1805         /* This will disable recovery and flush any recovery work. */
1806         ocfs2_recovery_exit(osb);
1807
1808         ocfs2_journal_shutdown(osb);
1809
1810         ocfs2_sync_blockdev(sb);
1811
1812         /* No cluster connection means we've failed during mount, so skip
1813          * all the steps which depended on that to complete. */
1814         if (osb->cconn) {
1815                 tmp = ocfs2_super_lock(osb, 1);
1816                 if (tmp < 0) {
1817                         mlog_errno(tmp);
1818                         return;
1819                 }
1820         }
1821
1822         if (osb->slot_num != OCFS2_INVALID_SLOT)
1823                 ocfs2_put_slot(osb);
1824
1825         if (osb->cconn)
1826                 ocfs2_super_unlock(osb, 1);
1827
1828         ocfs2_release_system_inodes(osb);
1829
1830         /*
1831          * If we're dismounting due to mount error, mount.ocfs2 will clean
1832          * up heartbeat.  If we're a local mount, there is no heartbeat.
1833          * If we failed before we got a uuid_str yet, we can't stop
1834          * heartbeat.  Otherwise, do it.
1835          */
1836         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1837                 hangup_needed = 1;
1838
1839         if (osb->cconn)
1840                 ocfs2_dlm_shutdown(osb, hangup_needed);
1841
1842         debugfs_remove(osb->osb_debug_root);
1843
1844         if (hangup_needed)
1845                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1846
1847         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1848
1849         if (ocfs2_mount_local(osb))
1850                 snprintf(nodestr, sizeof(nodestr), "local");
1851         else
1852                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1853
1854         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1855                osb->dev_str, nodestr);
1856
1857         ocfs2_delete_osb(osb);
1858         kfree(osb);
1859         sb->s_dev = 0;
1860         sb->s_fs_info = NULL;
1861 }
1862
1863 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1864                                 unsigned uuid_bytes)
1865 {
1866         int i, ret;
1867         char *ptr;
1868
1869         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1870
1871         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1872         if (osb->uuid_str == NULL)
1873                 return -ENOMEM;
1874
1875         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1876                 /* print with null */
1877                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1878                 if (ret != 2) /* drop super cleans up */
1879                         return -EINVAL;
1880                 /* then only advance past the last char */
1881                 ptr += 2;
1882         }
1883
1884         return 0;
1885 }
1886
1887 static int ocfs2_initialize_super(struct super_block *sb,
1888                                   struct buffer_head *bh,
1889                                   int sector_size)
1890 {
1891         int status;
1892         int i, cbits, bbits;
1893         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1894         struct inode *inode = NULL;
1895         struct ocfs2_journal *journal;
1896         __le32 uuid_net_key;
1897         struct ocfs2_super *osb;
1898
1899         mlog_entry_void();
1900
1901         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1902         if (!osb) {
1903                 status = -ENOMEM;
1904                 mlog_errno(status);
1905                 goto bail;
1906         }
1907
1908         sb->s_fs_info = osb;
1909         sb->s_op = &ocfs2_sops;
1910         sb->s_export_op = &ocfs2_export_ops;
1911         sb->s_qcop = &ocfs2_quotactl_ops;
1912         sb->dq_op = &ocfs2_quota_operations;
1913         sb->s_xattr = ocfs2_xattr_handlers;
1914         sb->s_time_gran = 1;
1915         sb->s_flags |= MS_NOATIME;
1916         /* this is needed to support O_LARGEFILE */
1917         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1918         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1919         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1920
1921         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1922
1923         for (i = 0; i < 3; i++)
1924                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1925         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1926
1927         osb->sb = sb;
1928         /* Save off for ocfs2_rw_direct */
1929         osb->s_sectsize_bits = blksize_bits(sector_size);
1930         BUG_ON(!osb->s_sectsize_bits);
1931
1932         spin_lock_init(&osb->dc_task_lock);
1933         init_waitqueue_head(&osb->dc_event);
1934         osb->dc_work_sequence = 0;
1935         osb->dc_wake_sequence = 0;
1936         INIT_LIST_HEAD(&osb->blocked_lock_list);
1937         osb->blocked_lock_count = 0;
1938         spin_lock_init(&osb->osb_lock);
1939         spin_lock_init(&osb->osb_xattr_lock);
1940         ocfs2_init_inode_steal_slot(osb);
1941
1942         atomic_set(&osb->alloc_stats.moves, 0);
1943         atomic_set(&osb->alloc_stats.local_data, 0);
1944         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1945         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1946         atomic_set(&osb->alloc_stats.bg_extends, 0);
1947
1948         ocfs2_init_node_maps(osb);
1949
1950         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1951                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1952
1953         status = ocfs2_recovery_init(osb);
1954         if (status) {
1955                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1956                 mlog_errno(status);
1957                 goto bail;
1958         }
1959
1960         init_waitqueue_head(&osb->checkpoint_event);
1961         atomic_set(&osb->needs_checkpoint, 0);
1962
1963         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1964
1965         osb->slot_num = OCFS2_INVALID_SLOT;
1966
1967         osb->s_xattr_inline_size = le16_to_cpu(
1968                                         di->id2.i_super.s_xattr_inline_size);
1969
1970         osb->local_alloc_state = OCFS2_LA_UNUSED;
1971         osb->local_alloc_bh = NULL;
1972         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
1973
1974         init_waitqueue_head(&osb->osb_mount_event);
1975
1976         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1977         if (!osb->vol_label) {
1978                 mlog(ML_ERROR, "unable to alloc vol label\n");
1979                 status = -ENOMEM;
1980                 goto bail;
1981         }
1982
1983         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1984         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1985                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1986                      osb->max_slots);
1987                 status = -EINVAL;
1988                 goto bail;
1989         }
1990         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1991
1992         osb->slot_recovery_generations =
1993                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
1994                         GFP_KERNEL);
1995         if (!osb->slot_recovery_generations) {
1996                 status = -ENOMEM;
1997                 mlog_errno(status);
1998                 goto bail;
1999         }
2000
2001         init_waitqueue_head(&osb->osb_wipe_event);
2002         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2003                                         sizeof(*osb->osb_orphan_wipes),
2004                                         GFP_KERNEL);
2005         if (!osb->osb_orphan_wipes) {
2006                 status = -ENOMEM;
2007                 mlog_errno(status);
2008                 goto bail;
2009         }
2010
2011         osb->s_feature_compat =
2012                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2013         osb->s_feature_ro_compat =
2014                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2015         osb->s_feature_incompat =
2016                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2017
2018         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2019                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2020                      "optional features (%x).\n", i);
2021                 status = -EINVAL;
2022                 goto bail;
2023         }
2024         if (!(osb->sb->s_flags & MS_RDONLY) &&
2025             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2026                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2027                      "unsupported optional features (%x).\n", i);
2028                 status = -EINVAL;
2029                 goto bail;
2030         }
2031
2032         if (ocfs2_userspace_stack(osb)) {
2033                 memcpy(osb->osb_cluster_stack,
2034                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2035                        OCFS2_STACK_LABEL_LEN);
2036                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2037                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2038                         mlog(ML_ERROR,
2039                              "couldn't mount because of an invalid "
2040                              "cluster stack label (%s) \n",
2041                              osb->osb_cluster_stack);
2042                         status = -EINVAL;
2043                         goto bail;
2044                 }
2045         } else {
2046                 /* The empty string is identical with classic tools that
2047                  * don't know about s_cluster_info. */
2048                 osb->osb_cluster_stack[0] = '\0';
2049         }
2050
2051         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2052
2053         /* FIXME
2054          * This should be done in ocfs2_journal_init(), but unknown
2055          * ordering issues will cause the filesystem to crash.
2056          * If anyone wants to figure out what part of the code
2057          * refers to osb->journal before ocfs2_journal_init() is run,
2058          * be my guest.
2059          */
2060         /* initialize our journal structure */
2061
2062         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2063         if (!journal) {
2064                 mlog(ML_ERROR, "unable to alloc journal\n");
2065                 status = -ENOMEM;
2066                 goto bail;
2067         }
2068         osb->journal = journal;
2069         journal->j_osb = osb;
2070
2071         atomic_set(&journal->j_num_trans, 0);
2072         init_rwsem(&journal->j_trans_barrier);
2073         init_waitqueue_head(&journal->j_checkpointed);
2074         spin_lock_init(&journal->j_lock);
2075         journal->j_trans_id = (unsigned long) 1;
2076         INIT_LIST_HEAD(&journal->j_la_cleanups);
2077         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2078         journal->j_state = OCFS2_JOURNAL_FREE;
2079
2080         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2081         osb->dentry_lock_list = NULL;
2082
2083         /* get some pseudo constants for clustersize bits */
2084         osb->s_clustersize_bits =
2085                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2086         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2087         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2088
2089         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2090             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2091                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2092                      osb->s_clustersize);
2093                 status = -EINVAL;
2094                 goto bail;
2095         }
2096
2097         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2098             > (u32)~0UL) {
2099                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2100                      "what jbd can address in 32 bits.\n");
2101                 status = -EINVAL;
2102                 goto bail;
2103         }
2104
2105         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2106                                  sizeof(di->id2.i_super.s_uuid))) {
2107                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2108                 status = -ENOMEM;
2109                 goto bail;
2110         }
2111
2112         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2113
2114         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2115         osb->vol_label[63] = '\0';
2116         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2117         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2118         osb->first_cluster_group_blkno =
2119                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2120         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2121         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2122         mlog(0, "vol_label: %s\n", osb->vol_label);
2123         mlog(0, "uuid: %s\n", osb->uuid_str);
2124         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2125              (unsigned long long)osb->root_blkno,
2126              (unsigned long long)osb->system_dir_blkno);
2127
2128         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2129         if (!osb->osb_dlm_debug) {
2130                 status = -ENOMEM;
2131                 mlog_errno(status);
2132                 goto bail;
2133         }
2134
2135         atomic_set(&osb->vol_state, VOLUME_INIT);
2136
2137         /* load root, system_dir, and all global system inodes */
2138         status = ocfs2_init_global_system_inodes(osb);
2139         if (status < 0) {
2140                 mlog_errno(status);
2141                 goto bail;
2142         }
2143
2144         /*
2145          * global bitmap
2146          */
2147         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2148                                             OCFS2_INVALID_SLOT);
2149         if (!inode) {
2150                 status = -EINVAL;
2151                 mlog_errno(status);
2152                 goto bail;
2153         }
2154
2155         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2156         iput(inode);
2157
2158         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2159
2160         status = ocfs2_init_slot_info(osb);
2161         if (status < 0) {
2162                 mlog_errno(status);
2163                 goto bail;
2164         }
2165
2166 bail:
2167         mlog_exit(status);
2168         return status;
2169 }
2170
2171 /*
2172  * will return: -EAGAIN if it is ok to keep searching for superblocks
2173  *              -EINVAL if there is a bad superblock
2174  *              0 on success
2175  */
2176 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2177                                struct buffer_head *bh,
2178                                u32 blksz)
2179 {
2180         int status = -EAGAIN;
2181
2182         mlog_entry_void();
2183
2184         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2185                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2186                 /* We have to do a raw check of the feature here */
2187                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2188                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2189                         status = ocfs2_block_check_validate(bh->b_data,
2190                                                             bh->b_size,
2191                                                             &di->i_check);
2192                         if (status)
2193                                 goto out;
2194                 }
2195                 status = -EINVAL;
2196                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2197                         mlog(ML_ERROR, "found superblock with incorrect block "
2198                              "size: found %u, should be %u\n",
2199                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2200                                blksz);
2201                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2202                            OCFS2_MAJOR_REV_LEVEL ||
2203                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2204                            OCFS2_MINOR_REV_LEVEL) {
2205                         mlog(ML_ERROR, "found superblock with bad version: "
2206                              "found %u.%u, should be %u.%u\n",
2207                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2208                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2209                              OCFS2_MAJOR_REV_LEVEL,
2210                              OCFS2_MINOR_REV_LEVEL);
2211                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2212                         mlog(ML_ERROR, "bad block number on superblock: "
2213                              "found %llu, should be %llu\n",
2214                              (unsigned long long)le64_to_cpu(di->i_blkno),
2215                              (unsigned long long)bh->b_blocknr);
2216                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2217                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2218                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2219                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2220                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2221                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2222                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2223                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2224                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2225                         mlog(ML_ERROR,
2226                              "Superblock slots found greater than file system "
2227                              "maximum: found %u, max %u\n",
2228                              le16_to_cpu(di->id2.i_super.s_max_slots),
2229                              OCFS2_MAX_SLOTS);
2230                 } else {
2231                         /* found it! */
2232                         status = 0;
2233                 }
2234         }
2235
2236 out:
2237         mlog_exit(status);
2238         return status;
2239 }
2240
2241 static int ocfs2_check_volume(struct ocfs2_super *osb)
2242 {
2243         int status;
2244         int dirty;
2245         int local;
2246         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2247                                                   * recover
2248                                                   * ourselves. */
2249
2250         mlog_entry_void();
2251
2252         /* Init our journal object. */
2253         status = ocfs2_journal_init(osb->journal, &dirty);
2254         if (status < 0) {
2255                 mlog(ML_ERROR, "Could not initialize journal!\n");
2256                 goto finally;
2257         }
2258
2259         /* If the journal was unmounted cleanly then we don't want to
2260          * recover anything. Otherwise, journal_load will do that
2261          * dirty work for us :) */
2262         if (!dirty) {
2263                 status = ocfs2_journal_wipe(osb->journal, 0);
2264                 if (status < 0) {
2265                         mlog_errno(status);
2266                         goto finally;
2267                 }
2268         } else {
2269                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2270                      "recovering volume.\n");
2271         }
2272
2273         local = ocfs2_mount_local(osb);
2274
2275         /* will play back anything left in the journal. */
2276         status = ocfs2_journal_load(osb->journal, local, dirty);
2277         if (status < 0) {
2278                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2279                 goto finally;
2280         }
2281
2282         if (dirty) {
2283                 /* recover my local alloc if we didn't unmount cleanly. */
2284                 status = ocfs2_begin_local_alloc_recovery(osb,
2285                                                           osb->slot_num,
2286                                                           &local_alloc);
2287                 if (status < 0) {
2288                         mlog_errno(status);
2289                         goto finally;
2290                 }
2291                 /* we complete the recovery process after we've marked
2292                  * ourselves as mounted. */
2293         }
2294
2295         mlog(0, "Journal loaded.\n");
2296
2297         status = ocfs2_load_local_alloc(osb);
2298         if (status < 0) {
2299                 mlog_errno(status);
2300                 goto finally;
2301         }
2302
2303         if (dirty) {
2304                 /* Recovery will be completed after we've mounted the
2305                  * rest of the volume. */
2306                 osb->dirty = 1;
2307                 osb->local_alloc_copy = local_alloc;
2308                 local_alloc = NULL;
2309         }
2310
2311         /* go through each journal, trylock it and if you get the
2312          * lock, and it's marked as dirty, set the bit in the recover
2313          * map and launch a recovery thread for it. */
2314         status = ocfs2_mark_dead_nodes(osb);
2315         if (status < 0) {
2316                 mlog_errno(status);
2317                 goto finally;
2318         }
2319
2320         status = ocfs2_compute_replay_slots(osb);
2321         if (status < 0)
2322                 mlog_errno(status);
2323
2324 finally:
2325         if (local_alloc)
2326                 kfree(local_alloc);
2327
2328         mlog_exit(status);
2329         return status;
2330 }
2331
2332 /*
2333  * The routine gets called from dismount or close whenever a dismount on
2334  * volume is requested and the osb open count becomes 1.
2335  * It will remove the osb from the global list and also free up all the
2336  * initialized resources and fileobject.
2337  */
2338 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2339 {
2340         mlog_entry_void();
2341
2342         /* This function assumes that the caller has the main osb resource */
2343
2344         ocfs2_free_slot_info(osb);
2345
2346         kfree(osb->osb_orphan_wipes);
2347         kfree(osb->slot_recovery_generations);
2348         /* FIXME
2349          * This belongs in journal shutdown, but because we have to
2350          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2351          * we free it here.
2352          */
2353         kfree(osb->journal);
2354         if (osb->local_alloc_copy)
2355                 kfree(osb->local_alloc_copy);
2356         kfree(osb->uuid_str);
2357         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2358         memset(osb, 0, sizeof(struct ocfs2_super));
2359
2360         mlog_exit_void();
2361 }
2362
2363 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2364  * panic(). We do not support continue-on-error operation. */
2365 static void ocfs2_handle_error(struct super_block *sb)
2366 {
2367         struct ocfs2_super *osb = OCFS2_SB(sb);
2368
2369         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2370                 panic("OCFS2: (device %s): panic forced after error\n",
2371                       sb->s_id);
2372
2373         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2374
2375         if (sb->s_flags & MS_RDONLY &&
2376             (ocfs2_is_soft_readonly(osb) ||
2377              ocfs2_is_hard_readonly(osb)))
2378                 return;
2379
2380         printk(KERN_CRIT "File system is now read-only due to the potential "
2381                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2382                "system is unmounted.\n");
2383         sb->s_flags |= MS_RDONLY;
2384         ocfs2_set_ro_flag(osb, 0);
2385 }
2386
2387 static char error_buf[1024];
2388
2389 void __ocfs2_error(struct super_block *sb,
2390                    const char *function,
2391                    const char *fmt, ...)
2392 {
2393         va_list args;
2394
2395         va_start(args, fmt);
2396         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2397         va_end(args);
2398
2399         /* Not using mlog here because we want to show the actual
2400          * function the error came from. */
2401         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2402                sb->s_id, function, error_buf);
2403
2404         ocfs2_handle_error(sb);
2405 }
2406
2407 /* Handle critical errors. This is intentionally more drastic than
2408  * ocfs2_handle_error, so we only use for things like journal errors,
2409  * etc. */
2410 void __ocfs2_abort(struct super_block* sb,
2411                    const char *function,
2412                    const char *fmt, ...)
2413 {
2414         va_list args;
2415
2416         va_start(args, fmt);
2417         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2418         va_end(args);
2419
2420         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2421                sb->s_id, function, error_buf);
2422
2423         /* We don't have the cluster support yet to go straight to
2424          * hard readonly in here. Until then, we want to keep
2425          * ocfs2_abort() so that we can at least mark critical
2426          * errors.
2427          *
2428          * TODO: This should abort the journal and alert other nodes
2429          * that our slot needs recovery. */
2430
2431         /* Force a panic(). This stinks, but it's better than letting
2432          * things continue without having a proper hard readonly
2433          * here. */
2434         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2435         ocfs2_handle_error(sb);
2436 }
2437
2438 module_init(ocfs2_init);
2439 module_exit(ocfs2_exit);