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/init.h>
  32 #include <linux/random.h>
  33 #include <linux/statfs.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/socket.h>
  37 #include <linux/inet.h>
  38 #include <linux/parser.h>
  39 #include <linux/crc32.h>
  40 #include <linux/debugfs.h>
  41 #include <linux/mount.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/quotaops.h>
  44 #include <linux/cleancache.h>
  45
  46 #define CREATE_TRACE_POINTS
  47 #include "ocfs2_trace.h"
  48
  49 #include <cluster/masklog.h>
  50
  51 #include "ocfs2.h"
  52
  53 /* this should be the only file to include a version 1 header */
  54 #include "ocfs1_fs_compat.h"
  55
  56 #include "alloc.h"
  57 #include "aops.h"
  58 #include "blockcheck.h"
  59 #include "dlmglue.h"
  60 #include "export.h"
  61 #include "extent_map.h"
  62 #include "heartbeat.h"
  63 #include "inode.h"
  64 #include "journal.h"
  65 #include "localalloc.h"
  66 #include "namei.h"
  67 #include "slot_map.h"
  68 #include "super.h"
  69 #include "sysfile.h"
  70 #include "uptodate.h"
  71 #include "xattr.h"
  72 #include "quota.h"
  73 #include "refcounttree.h"
  74 #include "suballoc.h"
  75
  76 #include "buffer_head_io.h"
  77
  78 static struct kmem_cache *ocfs2_inode_cachep;
  79 struct kmem_cache *ocfs2_dquot_cachep;
  80 struct kmem_cache *ocfs2_qf_chunk_cachep;
  81
  82 /* OCFS2 needs to schedule several different types of work which
  83  * require cluster locking, disk I/O, recovery waits, etc. Since these
  84  * types of work tend to be heavy we avoid using the kernel events
  85  * workqueue and schedule on our own. */
  86 struct workqueue_struct *ocfs2_wq = NULL;
  87
  88 static struct dentry *ocfs2_debugfs_root;
  89
  90 MODULE_AUTHOR("Oracle");
  91 MODULE_LICENSE("GPL");
  92 MODULE_DESCRIPTION("OCFS2 cluster file system");
  93
  94 struct mount_options
  95 {
  96         unsigned long   commit_interval;
  97         unsigned long   mount_opt;
  98         unsigned int    atime_quantum;
  99         unsigned short  slot;
 100         int             localalloc_opt;
 101         unsigned int    resv_level;
 102         int             dir_resv_level;
 103         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
 104 };
 105
 106 static int ocfs2_parse_options(struct super_block *sb, char *options,
 107                                struct mount_options *mopt,
 108                                int is_remount);
 109 static int ocfs2_check_set_options(struct super_block *sb,
 110                                    struct mount_options *options);
 111 static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
 112 static void ocfs2_put_super(struct super_block *sb);
 113 static int ocfs2_mount_volume(struct super_block *sb);
 114 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 115 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 116 static int ocfs2_initialize_mem_caches(void);
 117 static void ocfs2_free_mem_caches(void);
 118 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 119
 120 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 121
 122 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 123
 124 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 125 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 126 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 127 static int ocfs2_check_volume(struct ocfs2_super *osb);
 128 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 129                                struct buffer_head *bh,
 130                                u32 sectsize,
 131                                struct ocfs2_blockcheck_stats *stats);
 132 static int ocfs2_initialize_super(struct super_block *sb,
 133                                   struct buffer_head *bh,
 134                                   int sector_size,
 135                                   struct ocfs2_blockcheck_stats *stats);
 136 static int ocfs2_get_sector(struct super_block *sb,
 137                             struct buffer_head **bh,
 138                             int block,
 139                             int sect_size);
 140 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 141 static void ocfs2_destroy_inode(struct inode *inode);
 142 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 143 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 144 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 145
 146 static struct dquot **ocfs2_get_dquots(struct inode *inode)
 147 {
 148         return OCFS2_I(inode)->i_dquot;
 149 }
 150
 151 static const struct super_operations ocfs2_sops = {
 152         .statfs         = ocfs2_statfs,
 153         .alloc_inode    = ocfs2_alloc_inode,
 154         .destroy_inode  = ocfs2_destroy_inode,
 155         .drop_inode     = ocfs2_drop_inode,
 156         .evict_inode    = ocfs2_evict_inode,
 157         .sync_fs        = ocfs2_sync_fs,
 158         .put_super      = ocfs2_put_super,
 159         .remount_fs     = ocfs2_remount,
 160         .show_options   = ocfs2_show_options,
 161         .quota_read     = ocfs2_quota_read,
 162         .quota_write    = ocfs2_quota_write,
 163         .get_dquots     = ocfs2_get_dquots,
 164 };
 165
 166 enum {
 167         Opt_barrier,
 168         Opt_err_panic,
 169         Opt_err_ro,
 170         Opt_intr,
 171         Opt_nointr,
 172         Opt_hb_none,
 173         Opt_hb_local,
 174         Opt_hb_global,
 175         Opt_data_ordered,
 176         Opt_data_writeback,
 177         Opt_atime_quantum,
 178         Opt_slot,
 179         Opt_commit,
 180         Opt_localalloc,
 181         Opt_localflocks,
 182         Opt_stack,
 183         Opt_user_xattr,
 184         Opt_nouser_xattr,
 185         Opt_inode64,
 186         Opt_acl,
 187         Opt_noacl,
 188         Opt_usrquota,
 189         Opt_grpquota,
 190         Opt_coherency_buffered,
 191         Opt_coherency_full,
 192         Opt_resv_level,
 193         Opt_dir_resv_level,
 194         Opt_journal_async_commit,
 195         Opt_err_cont,
 196         Opt_err,
 197 };
 198
 199 static const match_table_t tokens = {
 200         {Opt_barrier, "barrier=%u"},
 201         {Opt_err_panic, "errors=panic"},
 202         {Opt_err_ro, "errors=remount-ro"},
 203         {Opt_intr, "intr"},
 204         {Opt_nointr, "nointr"},
 205         {Opt_hb_none, OCFS2_HB_NONE},
 206         {Opt_hb_local, OCFS2_HB_LOCAL},
 207         {Opt_hb_global, OCFS2_HB_GLOBAL},
 208         {Opt_data_ordered, "data=ordered"},
 209         {Opt_data_writeback, "data=writeback"},
 210         {Opt_atime_quantum, "atime_quantum=%u"},
 211         {Opt_slot, "preferred_slot=%u"},
 212         {Opt_commit, "commit=%u"},
 213         {Opt_localalloc, "localalloc=%d"},
 214         {Opt_localflocks, "localflocks"},
 215         {Opt_stack, "cluster_stack=%s"},
 216         {Opt_user_xattr, "user_xattr"},
 217         {Opt_nouser_xattr, "nouser_xattr"},
 218         {Opt_inode64, "inode64"},
 219         {Opt_acl, "acl"},
 220         {Opt_noacl, "noacl"},
 221         {Opt_usrquota, "usrquota"},
 222         {Opt_grpquota, "grpquota"},
 223         {Opt_coherency_buffered, "coherency=buffered"},
 224         {Opt_coherency_full, "coherency=full"},
 225         {Opt_resv_level, "resv_level=%u"},
 226         {Opt_dir_resv_level, "dir_resv_level=%u"},
 227         {Opt_journal_async_commit, "journal_async_commit"},
 228         {Opt_err_cont, "errors=continue"},
 229         {Opt_err, NULL}
 230 };
 231
 232 #ifdef CONFIG_DEBUG_FS
 233 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 234 {
 235         struct ocfs2_cluster_connection *cconn = osb->cconn;
 236         struct ocfs2_recovery_map *rm = osb->recovery_map;
 237         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 238         int i, out = 0;
 239
 240         out += snprintf(buf + out, len - out,
 241                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 242                         "Device", osb->dev_str, osb->uuid_str,
 243                         osb->fs_generation, osb->vol_label);
 244
 245         out += snprintf(buf + out, len - out,
 246                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 247                         atomic_read(&osb->vol_state), osb->osb_flags);
 248
 249         out += snprintf(buf + out, len - out,
 250                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 251                         osb->sb->s_blocksize, osb->s_clustersize);
 252
 253         out += snprintf(buf + out, len - out,
 254                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 255                         "ROcompat: 0x%X\n",
 256                         "Features", osb->s_feature_compat,
 257                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 258
 259         out += snprintf(buf + out, len - out,
 260                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 261                         osb->s_mount_opt, osb->s_atime_quantum);
 262
 263         if (cconn) {
 264                 out += snprintf(buf + out, len - out,
 265                                 "%10s => Stack: %s  Name: %*s  "
 266                                 "Version: %d.%d\n", "Cluster",
 267                                 (*osb->osb_cluster_stack == '\0' ?
 268                                  "o2cb" : osb->osb_cluster_stack),
 269                                 cconn->cc_namelen, cconn->cc_name,
 270                                 cconn->cc_version.pv_major,
 271                                 cconn->cc_version.pv_minor);
 272         }
 273
 274         spin_lock(&osb->dc_task_lock);
 275         out += snprintf(buf + out, len - out,
 276                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 277                         "WorkSeq: %lu\n", "DownCnvt",
 278                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 279                         osb->blocked_lock_count, osb->dc_wake_sequence,
 280                         osb->dc_work_sequence);
 281         spin_unlock(&osb->dc_task_lock);
 282
 283         spin_lock(&osb->osb_lock);
 284         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 285                         "Recovery",
 286                         (osb->recovery_thread_task ?
 287                          task_pid_nr(osb->recovery_thread_task) : -1));
 288         if (rm->rm_used == 0)
 289                 out += snprintf(buf + out, len - out, " None\n");
 290         else {
 291                 for (i = 0; i < rm->rm_used; i++)
 292                         out += snprintf(buf + out, len - out, " %d",
 293                                         rm->rm_entries[i]);
 294                 out += snprintf(buf + out, len - out, "\n");
 295         }
 296         spin_unlock(&osb->osb_lock);
 297
 298         out += snprintf(buf + out, len - out,
 299                         "%10s => Pid: %d  Interval: %lu\n", "Commit",
 300                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 301                         osb->osb_commit_interval);
 302
 303         out += snprintf(buf + out, len - out,
 304                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 305                         "Journal", osb->journal->j_state,
 306                         osb->journal->j_trans_id,
 307                         atomic_read(&osb->journal->j_num_trans));
 308
 309         out += snprintf(buf + out, len - out,
 310                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 311                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 312                         "Stats",
 313                         atomic_read(&osb->alloc_stats.bitmap_data),
 314                         atomic_read(&osb->alloc_stats.local_data),
 315                         atomic_read(&osb->alloc_stats.bg_allocs),
 316                         atomic_read(&osb->alloc_stats.moves),
 317                         atomic_read(&osb->alloc_stats.bg_extends));
 318
 319         out += snprintf(buf + out, len - out,
 320                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 321                         "Default: %u bits\n",
 322                         "LocalAlloc", osb->local_alloc_state,
 323                         (unsigned long long)osb->la_last_gd,
 324                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 325
 326         spin_lock(&osb->osb_lock);
 327         out += snprintf(buf + out, len - out,
 328                         "%10s => InodeSlot: %d  StolenInodes: %d, "
 329                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
 330                         osb->s_inode_steal_slot,
 331                         atomic_read(&osb->s_num_inodes_stolen),
 332                         osb->s_meta_steal_slot,
 333                         atomic_read(&osb->s_num_meta_stolen));
 334         spin_unlock(&osb->osb_lock);
 335
 336         out += snprintf(buf + out, len - out, "OrphanScan => ");
 337         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 338                         os->os_count, os->os_seqno);
 339         out += snprintf(buf + out, len - out, " Last Scan: ");
 340         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 341                 out += snprintf(buf + out, len - out, "Disabled\n");
 342         else
 343                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 344                                 (get_seconds() - os->os_scantime.tv_sec));
 345
 346         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 347                         "Slots", "Num", "RecoGen");
 348         for (i = 0; i < osb->max_slots; ++i) {
 349                 out += snprintf(buf + out, len - out,
 350                                 "%10s  %c %3d  %10d\n",
 351                                 " ",
 352                                 (i == osb->slot_num ? '*' : ' '),
 353                                 i, osb->slot_recovery_generations[i]);
 354         }
 355
 356         return out;
 357 }
 358
 359 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 360 {
 361         struct ocfs2_super *osb = inode->i_private;
 362         char *buf = NULL;
 363
 364         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 365         if (!buf)
 366                 goto bail;
 367
 368         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 369
 370         file->private_data = buf;
 371
 372         return 0;
 373 bail:
 374         return -ENOMEM;
 375 }
 376
 377 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 378 {
 379         kfree(file->private_data);
 380         return 0;
 381 }
 382
 383 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 384                                 size_t nbytes, loff_t *ppos)
 385 {
 386         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 387                                        i_size_read(file->f_mapping->host));
 388 }
 389 #else
 390 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 391 {
 392         return 0;
 393 }
 394 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 395 {
 396         return 0;
 397 }
 398 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 399                                 size_t nbytes, loff_t *ppos)
 400 {
 401         return 0;
 402 }
 403 #endif  /* CONFIG_DEBUG_FS */
 404
 405 static const struct file_operations ocfs2_osb_debug_fops = {
 406         .open =         ocfs2_osb_debug_open,
 407         .release =      ocfs2_debug_release,
 408         .read =         ocfs2_debug_read,
 409         .llseek =       generic_file_llseek,
 410 };
 411
 412 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 413 {
 414         int status;
 415         tid_t target;
 416         struct ocfs2_super *osb = OCFS2_SB(sb);
 417
 418         if (ocfs2_is_hard_readonly(osb))
 419                 return -EROFS;
 420
 421         if (wait) {
 422                 status = ocfs2_flush_truncate_log(osb);
 423                 if (status < 0)
 424                         mlog_errno(status);
 425         } else {
 426                 ocfs2_schedule_truncate_log_flush(osb, 0);
 427         }
 428
 429         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 430                                       &target)) {
 431                 if (wait)
 432                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 433                                              target);
 434         }
 435         return 0;
 436 }
 437
 438 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 439 {
 440         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 441             && (ino == USER_QUOTA_SYSTEM_INODE
 442                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 443                 return 0;
 444         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 445             && (ino == GROUP_QUOTA_SYSTEM_INODE
 446                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 447                 return 0;
 448         return 1;
 449 }
 450
 451 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 452 {
 453         struct inode *new = NULL;
 454         int status = 0;
 455         int i;
 456
 457         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 458         if (IS_ERR(new)) {
 459                 status = PTR_ERR(new);
 460                 mlog_errno(status);
 461                 goto bail;
 462         }
 463         osb->root_inode = new;
 464
 465         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 466         if (IS_ERR(new)) {
 467                 status = PTR_ERR(new);
 468                 mlog_errno(status);
 469                 goto bail;
 470         }
 471         osb->sys_root_inode = new;
 472
 473         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 474              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 475                 if (!ocfs2_need_system_inode(osb, i))
 476                         continue;
 477                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 478                 if (!new) {
 479                         ocfs2_release_system_inodes(osb);
 480                         status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
 481                         mlog_errno(status);
 482                         mlog(ML_ERROR, "Unable to load system inode %d, "
 483                              "possibly corrupt fs?", i);
 484                         goto bail;
 485                 }
 486                 // the array now has one ref, so drop this one
 487                 iput(new);
 488         }
 489
 490 bail:
 491         if (status)
 492                 mlog_errno(status);
 493         return status;
 494 }
 495
 496 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 497 {
 498         struct inode *new = NULL;
 499         int status = 0;
 500         int i;
 501
 502         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 503              i < NUM_SYSTEM_INODES;
 504              i++) {
 505                 if (!ocfs2_need_system_inode(osb, i))
 506                         continue;
 507                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 508                 if (!new) {
 509                         ocfs2_release_system_inodes(osb);
 510                         status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
 511                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 512                              status, i, osb->slot_num);
 513                         goto bail;
 514                 }
 515                 /* the array now has one ref, so drop this one */
 516                 iput(new);
 517         }
 518
 519 bail:
 520         if (status)
 521                 mlog_errno(status);
 522         return status;
 523 }
 524
 525 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 526 {
 527         int i;
 528         struct inode *inode;
 529
 530         for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
 531                 inode = osb->global_system_inodes[i];
 532                 if (inode) {
 533                         iput(inode);
 534                         osb->global_system_inodes[i] = NULL;
 535                 }
 536         }
 537
 538         inode = osb->sys_root_inode;
 539         if (inode) {
 540                 iput(inode);
 541                 osb->sys_root_inode = NULL;
 542         }
 543
 544         inode = osb->root_inode;
 545         if (inode) {
 546                 iput(inode);
 547                 osb->root_inode = NULL;
 548         }
 549
 550         if (!osb->local_system_inodes)
 551                 return;
 552
 553         for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
 554                 if (osb->local_system_inodes[i]) {
 555                         iput(osb->local_system_inodes[i]);
 556                         osb->local_system_inodes[i] = NULL;
 557                 }
 558         }
 559
 560         kfree(osb->local_system_inodes);
 561         osb->local_system_inodes = NULL;
 562 }
 563
 564 /* We're allocating fs objects, use GFP_NOFS */
 565 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 566 {
 567         struct ocfs2_inode_info *oi;
 568
 569         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 570         if (!oi)
 571                 return NULL;
 572
 573         oi->i_sync_tid = 0;
 574         oi->i_datasync_tid = 0;
 575         memset(&oi->i_dquot, 0, sizeof(oi->i_dquot));
 576
 577         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 578         return &oi->vfs_inode;
 579 }
 580
 581 static void ocfs2_i_callback(struct rcu_head *head)
 582 {
 583         struct inode *inode = container_of(head, struct inode, i_rcu);
 584         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 585 }
 586
 587 static void ocfs2_destroy_inode(struct inode *inode)
 588 {
 589         call_rcu(&inode->i_rcu, ocfs2_i_callback);
 590 }
 591
 592 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 593                                                 unsigned int cbits)
 594 {
 595         unsigned int bytes = 1 << cbits;
 596         unsigned int trim = bytes;
 597         unsigned int bitshift = 32;
 598
 599         /*
 600          * i_size and all block offsets in ocfs2 are always 64 bits
 601          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 602          * 64 bit platforms, cluster size will be the limiting factor.
 603          */
 604
 605 #if BITS_PER_LONG == 32
 606 # if defined(CONFIG_LBDAF)
 607         BUILD_BUG_ON(sizeof(sector_t) != 8);
 608         /*
 609          * We might be limited by page cache size.
 610          */
 611         if (bytes > PAGE_CACHE_SIZE) {
 612                 bytes = PAGE_CACHE_SIZE;
 613                 trim = 1;
 614                 /*
 615                  * Shift by 31 here so that we don't get larger than
 616                  * MAX_LFS_FILESIZE
 617                  */
 618                 bitshift = 31;
 619         }
 620 # else
 621         /*
 622          * We are limited by the size of sector_t. Use block size, as
 623          * that's what we expose to the VFS.
 624          */
 625         bytes = 1 << bbits;
 626         trim = 1;
 627         bitshift = 31;
 628 # endif
 629 #endif
 630
 631         /*
 632          * Trim by a whole cluster when we can actually approach the
 633          * on-disk limits. Otherwise we can overflow i_clusters when
 634          * an extent start is at the max offset.
 635          */
 636         return (((unsigned long long)bytes) << bitshift) - trim;
 637 }
 638
 639 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 640 {
 641         int incompat_features;
 642         int ret = 0;
 643         struct mount_options parsed_options;
 644         struct ocfs2_super *osb = OCFS2_SB(sb);
 645         u32 tmp;
 646
 647         sync_filesystem(sb);
 648
 649         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
 650             !ocfs2_check_set_options(sb, &parsed_options)) {
 651                 ret = -EINVAL;
 652                 goto out;
 653         }
 654
 655         tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
 656                 OCFS2_MOUNT_HB_NONE;
 657         if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
 658                 ret = -EINVAL;
 659                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 660                 goto out;
 661         }
 662
 663         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 664             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 665                 ret = -EINVAL;
 666                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 667                 goto out;
 668         }
 669
 670         /* Probably don't want this on remount; it might
 671          * mess with other nodes */
 672         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 673             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 674                 ret = -EINVAL;
 675                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 676                 goto out;
 677         }
 678
 679         /* We're going to/from readonly mode. */
 680         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 681                 /* Disable quota accounting before remounting RO */
 682                 if (*flags & MS_RDONLY) {
 683                         ret = ocfs2_susp_quotas(osb, 0);
 684                         if (ret < 0)
 685                                 goto out;
 686                 }
 687                 /* Lock here so the check of HARD_RO and the potential
 688                  * setting of SOFT_RO is atomic. */
 689                 spin_lock(&osb->osb_lock);
 690                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 691                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 692                         ret = -EROFS;
 693                         goto unlock_osb;
 694                 }
 695
 696                 if (*flags & MS_RDONLY) {
 697                         sb->s_flags |= MS_RDONLY;
 698                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 699                 } else {
 700                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 701                                 mlog(ML_ERROR, "Cannot remount RDWR "
 702                                      "filesystem due to previous errors.\n");
 703                                 ret = -EROFS;
 704                                 goto unlock_osb;
 705                         }
 706                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 707                         if (incompat_features) {
 708                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 709                                      "of unsupported optional features "
 710                                      "(%x).\n", incompat_features);
 711                                 ret = -EINVAL;
 712                                 goto unlock_osb;
 713                         }
 714                         sb->s_flags &= ~MS_RDONLY;
 715                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 716                 }
 717                 trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
 718 unlock_osb:
 719                 spin_unlock(&osb->osb_lock);
 720                 /* Enable quota accounting after remounting RW */
 721                 if (!ret && !(*flags & MS_RDONLY)) {
 722                         if (sb_any_quota_suspended(sb))
 723                                 ret = ocfs2_susp_quotas(osb, 1);
 724                         else
 725                                 ret = ocfs2_enable_quotas(osb);
 726                         if (ret < 0) {
 727                                 /* Return back changes... */
 728                                 spin_lock(&osb->osb_lock);
 729                                 sb->s_flags |= MS_RDONLY;
 730                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 731                                 spin_unlock(&osb->osb_lock);
 732                                 goto out;
 733                         }
 734                 }
 735         }
 736
 737         if (!ret) {
 738                 /* Only save off the new mount options in case of a successful
 739                  * remount. */
 740                 osb->s_mount_opt = parsed_options.mount_opt;
 741                 osb->s_atime_quantum = parsed_options.atime_quantum;
 742                 osb->preferred_slot = parsed_options.slot;
 743                 if (parsed_options.commit_interval)
 744                         osb->osb_commit_interval = parsed_options.commit_interval;
 745
 746                 if (!ocfs2_is_hard_readonly(osb))
 747                         ocfs2_set_journal_params(osb);
 748
 749                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 750                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
 751                                                         MS_POSIXACL : 0);
 752         }
 753 out:
 754         return ret;
 755 }
 756
 757 static int ocfs2_sb_probe(struct super_block *sb,
 758                           struct buffer_head **bh,
 759                           int *sector_size,
 760                           struct ocfs2_blockcheck_stats *stats)
 761 {
 762         int status, tmpstat;
 763         struct ocfs1_vol_disk_hdr *hdr;
 764         struct ocfs2_dinode *di;
 765         int blksize;
 766
 767         *bh = NULL;
 768
 769         /* may be > 512 */
 770         *sector_size = bdev_logical_block_size(sb->s_bdev);
 771         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 772                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 773                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 774                 status = -EINVAL;
 775                 goto bail;
 776         }
 777
 778         /* Can this really happen? */
 779         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 780                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 781
 782         /* check block zero for old format */
 783         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 784         if (status < 0) {
 785                 mlog_errno(status);
 786                 goto bail;
 787         }
 788         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 789         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 790                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 791                      hdr->major_version, hdr->minor_version);
 792                 status = -EINVAL;
 793         }
 794         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 795                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 796                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 797                      hdr->signature);
 798                 status = -EINVAL;
 799         }
 800         brelse(*bh);
 801         *bh = NULL;
 802         if (status < 0) {
 803                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 804                      "upgraded before mounting with ocfs v2\n");
 805                 goto bail;
 806         }
 807
 808         /*
 809          * Now check at magic offset for 512, 1024, 2048, 4096
 810          * blocksizes.  4096 is the maximum blocksize because it is
 811          * the minimum clustersize.
 812          */
 813         status = -EINVAL;
 814         for (blksize = *sector_size;
 815              blksize <= OCFS2_MAX_BLOCKSIZE;
 816              blksize <<= 1) {
 817                 tmpstat = ocfs2_get_sector(sb, bh,
 818                                            OCFS2_SUPER_BLOCK_BLKNO,
 819                                            blksize);
 820                 if (tmpstat < 0) {
 821                         status = tmpstat;
 822                         mlog_errno(status);
 823                         break;
 824                 }
 825                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 826                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 827                 spin_lock_init(&stats->b_lock);
 828                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 829                 if (tmpstat < 0) {
 830                         brelse(*bh);
 831                         *bh = NULL;
 832                 }
 833                 if (tmpstat != -EAGAIN) {
 834                         status = tmpstat;
 835                         break;
 836                 }
 837         }
 838
 839 bail:
 840         return status;
 841 }
 842
 843 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 844 {
 845         u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
 846
 847         if (osb->s_mount_opt & hb_enabled) {
 848                 if (ocfs2_mount_local(osb)) {
 849                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 850                              "mounted device.\n");
 851                         return -EINVAL;
 852                 }
 853                 if (ocfs2_userspace_stack(osb)) {
 854                         mlog(ML_ERROR, "Userspace stack expected, but "
 855                              "o2cb heartbeat arguments passed to mount\n");
 856                         return -EINVAL;
 857                 }
 858                 if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
 859                      !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
 860                     ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
 861                      ocfs2_cluster_o2cb_global_heartbeat(osb))) {
 862                         mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
 863                         return -EINVAL;
 864                 }
 865         }
 866
 867         if (!(osb->s_mount_opt & hb_enabled)) {
 868                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 869                     !ocfs2_userspace_stack(osb)) {
 870                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 871                              "a read-write clustered device.\n");
 872                         return -EINVAL;
 873                 }
 874         }
 875
 876         return 0;
 877 }
 878
 879 /*
 880  * If we're using a userspace stack, mount should have passed
 881  * a name that matches the disk.  If not, mount should not
 882  * have passed a stack.
 883  */
 884 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 885                                         struct mount_options *mopt)
 886 {
 887         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 888                 mlog(ML_ERROR,
 889                      "cluster stack passed to mount, but this filesystem "
 890                      "does not support it\n");
 891                 return -EINVAL;
 892         }
 893
 894         if (ocfs2_userspace_stack(osb) &&
 895             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 896                     OCFS2_STACK_LABEL_LEN)) {
 897                 mlog(ML_ERROR,
 898                      "cluster stack passed to mount (\"%s\") does not "
 899                      "match the filesystem (\"%s\")\n",
 900                      mopt->cluster_stack,
 901                      osb->osb_cluster_stack);
 902                 return -EINVAL;
 903         }
 904
 905         return 0;
 906 }
 907
 908 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 909 {
 910         int type;
 911         struct super_block *sb = osb->sb;
 912         unsigned int feature[OCFS2_MAXQUOTAS] = {
 913                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 914                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 915         int status = 0;
 916
 917         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
 918                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 919                         continue;
 920                 if (unsuspend)
 921                         status = dquot_resume(sb, type);
 922                 else {
 923                         struct ocfs2_mem_dqinfo *oinfo;
 924
 925                         /* Cancel periodic syncing before suspending */
 926                         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 927                         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 928                         status = dquot_suspend(sb, type);
 929                 }
 930                 if (status < 0)
 931                         break;
 932         }
 933         if (status < 0)
 934                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 935                      "remount (error = %d).\n", status);
 936         return status;
 937 }
 938
 939 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 940 {
 941         struct inode *inode[OCFS2_MAXQUOTAS] = { NULL, NULL };
 942         struct super_block *sb = osb->sb;
 943         unsigned int feature[OCFS2_MAXQUOTAS] = {
 944                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 945                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 946         unsigned int ino[OCFS2_MAXQUOTAS] = {
 947                                         LOCAL_USER_QUOTA_SYSTEM_INODE,
 948                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 949         int status;
 950         int type;
 951
 952         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 953         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
 954                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 955                         continue;
 956                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 957                                                         osb->slot_num);
 958                 if (!inode[type]) {
 959                         status = -ENOENT;
 960                         goto out_quota_off;
 961                 }
 962                 status = dquot_enable(inode[type], type, QFMT_OCFS2,
 963                                       DQUOT_USAGE_ENABLED);
 964                 if (status < 0)
 965                         goto out_quota_off;
 966         }
 967
 968         for (type = 0; type < OCFS2_MAXQUOTAS; type++)
 969                 iput(inode[type]);
 970         return 0;
 971 out_quota_off:
 972         ocfs2_disable_quotas(osb);
 973         for (type = 0; type < OCFS2_MAXQUOTAS; type++)
 974                 iput(inode[type]);
 975         mlog_errno(status);
 976         return status;
 977 }
 978
 979 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 980 {
 981         int type;
 982         struct inode *inode;
 983         struct super_block *sb = osb->sb;
 984         struct ocfs2_mem_dqinfo *oinfo;
 985
 986         /* We mostly ignore errors in this function because there's not much
 987          * we can do when we see them */
 988         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
 989                 if (!sb_has_quota_loaded(sb, type))
 990                         continue;
 991                 /* Cancel periodic syncing before we grab dqonoff_mutex */
 992                 oinfo = sb_dqinfo(sb, type)->dqi_priv;
 993                 cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 994                 inode = igrab(sb->s_dquot.files[type]);
 995                 /* Turn off quotas. This will remove all dquot structures from
 996                  * memory and so they will be automatically synced to global
 997                  * quota files */
 998                 dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
 999                                         DQUOT_LIMITS_ENABLED);
1000                 if (!inode)
1001                         continue;
1002                 iput(inode);
1003         }
1004 }
1005
1006 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1007 {
1008         struct dentry *root;
1009         int status, sector_size;
1010         struct mount_options parsed_options;
1011         struct inode *inode = NULL;
1012         struct ocfs2_super *osb = NULL;
1013         struct buffer_head *bh = NULL;
1014         char nodestr[12];
1015         struct ocfs2_blockcheck_stats stats;
1016
1017         trace_ocfs2_fill_super(sb, data, silent);
1018
1019         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1020                 status = -EINVAL;
1021                 goto read_super_error;
1022         }
1023
1024         /* probe for superblock */
1025         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1026         if (status < 0) {
1027                 mlog(ML_ERROR, "superblock probe failed!\n");
1028                 goto read_super_error;
1029         }
1030
1031         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1032         osb = OCFS2_SB(sb);
1033         if (status < 0) {
1034                 mlog_errno(status);
1035                 goto read_super_error;
1036         }
1037         brelse(bh);
1038         bh = NULL;
1039
1040         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1041                 status = -EINVAL;
1042                 goto read_super_error;
1043         }
1044         osb->s_mount_opt = parsed_options.mount_opt;
1045         osb->s_atime_quantum = parsed_options.atime_quantum;
1046         osb->preferred_slot = parsed_options.slot;
1047         osb->osb_commit_interval = parsed_options.commit_interval;
1048
1049         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1050         osb->osb_resv_level = parsed_options.resv_level;
1051         osb->osb_dir_resv_level = parsed_options.resv_level;
1052         if (parsed_options.dir_resv_level == -1)
1053                 osb->osb_dir_resv_level = parsed_options.resv_level;
1054         else
1055                 osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1056
1057         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1058         if (status)
1059                 goto read_super_error;
1060
1061         sb->s_magic = OCFS2_SUPER_MAGIC;
1062
1063         sb->s_flags = (sb->s_flags & ~(MS_POSIXACL | MS_NOSEC)) |
1064                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1065
1066         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1067          * heartbeat=none */
1068         if (bdev_read_only(sb->s_bdev)) {
1069                 if (!(sb->s_flags & MS_RDONLY)) {
1070                         status = -EACCES;
1071                         mlog(ML_ERROR, "Readonly device detected but readonly "
1072                              "mount was not specified.\n");
1073                         goto read_super_error;
1074                 }
1075
1076                 /* You should not be able to start a local heartbeat
1077                  * on a readonly device. */
1078                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1079                         status = -EROFS;
1080                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1081                              "device.\n");
1082                         goto read_super_error;
1083                 }
1084
1085                 status = ocfs2_check_journals_nolocks(osb);
1086                 if (status < 0) {
1087                         if (status == -EROFS)
1088                                 mlog(ML_ERROR, "Recovery required on readonly "
1089                                      "file system, but write access is "
1090                                      "unavailable.\n");
1091                         else
1092                                 mlog_errno(status);
1093                         goto read_super_error;
1094                 }
1095
1096                 ocfs2_set_ro_flag(osb, 1);
1097
1098                 printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1099                        "Cluster services will not be used for this mount. "
1100                        "Recovery will be skipped.\n", osb->dev_str);
1101         }
1102
1103         if (!ocfs2_is_hard_readonly(osb)) {
1104                 if (sb->s_flags & MS_RDONLY)
1105                         ocfs2_set_ro_flag(osb, 0);
1106         }
1107
1108         status = ocfs2_verify_heartbeat(osb);
1109         if (status < 0) {
1110                 mlog_errno(status);
1111                 goto read_super_error;
1112         }
1113
1114         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1115                                                  ocfs2_debugfs_root);
1116         if (!osb->osb_debug_root) {
1117                 status = -EINVAL;
1118                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1119                 goto read_super_error;
1120         }
1121
1122         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1123                                             osb->osb_debug_root,
1124                                             osb,
1125                                             &ocfs2_osb_debug_fops);
1126         if (!osb->osb_ctxt) {
1127                 status = -EINVAL;
1128                 mlog_errno(status);
1129                 goto read_super_error;
1130         }
1131
1132         if (ocfs2_meta_ecc(osb)) {
1133                 status = ocfs2_blockcheck_stats_debugfs_install(
1134                                                 &osb->osb_ecc_stats,
1135                                                 osb->osb_debug_root);
1136                 if (status) {
1137                         mlog(ML_ERROR,
1138                              "Unable to create blockcheck statistics "
1139                              "files\n");
1140                         goto read_super_error;
1141                 }
1142         }
1143
1144         status = ocfs2_mount_volume(sb);
1145         if (status < 0)
1146                 goto read_super_error;
1147
1148         if (osb->root_inode)
1149                 inode = igrab(osb->root_inode);
1150
1151         if (!inode) {
1152                 status = -EIO;
1153                 mlog_errno(status);
1154                 goto read_super_error;
1155         }
1156
1157         root = d_make_root(inode);
1158         if (!root) {
1159                 status = -ENOMEM;
1160                 mlog_errno(status);
1161                 goto read_super_error;
1162         }
1163
1164         sb->s_root = root;
1165
1166         ocfs2_complete_mount_recovery(osb);
1167
1168         if (ocfs2_mount_local(osb))
1169                 snprintf(nodestr, sizeof(nodestr), "local");
1170         else
1171                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1172
1173         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1174                "with %s data mode.\n",
1175                osb->dev_str, nodestr, osb->slot_num,
1176                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1177                "ordered");
1178
1179         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1180         wake_up(&osb->osb_mount_event);
1181
1182         /* Now we can initialize quotas because we can afford to wait
1183          * for cluster locks recovery now. That also means that truncation
1184          * log recovery can happen but that waits for proper quota setup */
1185         if (!(sb->s_flags & MS_RDONLY)) {
1186                 status = ocfs2_enable_quotas(osb);
1187                 if (status < 0) {
1188                         /* We have to err-out specially here because
1189                          * s_root is already set */
1190                         mlog_errno(status);
1191                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1192                         wake_up(&osb->osb_mount_event);
1193                         return status;
1194                 }
1195         }
1196
1197         ocfs2_complete_quota_recovery(osb);
1198
1199         /* Now we wake up again for processes waiting for quotas */
1200         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1201         wake_up(&osb->osb_mount_event);
1202
1203         /* Start this when the mount is almost sure of being successful */
1204         ocfs2_orphan_scan_start(osb);
1205
1206         return status;
1207
1208 read_super_error:
1209         brelse(bh);
1210
1211         if (osb) {
1212                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1213                 wake_up(&osb->osb_mount_event);
1214                 ocfs2_dismount_volume(sb, 1);
1215         }
1216
1217         if (status)
1218                 mlog_errno(status);
1219         return status;
1220 }
1221
1222 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1223                         int flags,
1224                         const char *dev_name,
1225                         void *data)
1226 {
1227         return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1228 }
1229
1230 static struct file_system_type ocfs2_fs_type = {
1231         .owner          = THIS_MODULE,
1232         .name           = "ocfs2",
1233         .mount          = ocfs2_mount,
1234         .kill_sb        = kill_block_super,
1235         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1236         .next           = NULL
1237 };
1238 MODULE_ALIAS_FS("ocfs2");
1239
1240 static int ocfs2_check_set_options(struct super_block *sb,
1241                                    struct mount_options *options)
1242 {
1243         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1244             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1245                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1246                 mlog(ML_ERROR, "User quotas were requested, but this "
1247                      "filesystem does not have the feature enabled.\n");
1248                 return 0;
1249         }
1250         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1251             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1252                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1253                 mlog(ML_ERROR, "Group quotas were requested, but this "
1254                      "filesystem does not have the feature enabled.\n");
1255                 return 0;
1256         }
1257         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1258             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1259                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1260                      "feature is not enabled\n");
1261                 return 0;
1262         }
1263         /* No ACL setting specified? Use XATTR feature... */
1264         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1265                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1266                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1267                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1268                 else
1269                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1270         }
1271         return 1;
1272 }
1273
1274 static int ocfs2_parse_options(struct super_block *sb,
1275                                char *options,
1276                                struct mount_options *mopt,
1277                                int is_remount)
1278 {
1279         int status, user_stack = 0;
1280         char *p;
1281         u32 tmp;
1282
1283         trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1284
1285         mopt->commit_interval = 0;
1286         mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1287         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1288         mopt->slot = OCFS2_INVALID_SLOT;
1289         mopt->localalloc_opt = -1;
1290         mopt->cluster_stack[0] = '\0';
1291         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1292         mopt->dir_resv_level = -1;
1293
1294         if (!options) {
1295                 status = 1;
1296                 goto bail;
1297         }
1298
1299         while ((p = strsep(&options, ",")) != NULL) {
1300                 int token, option;
1301                 substring_t args[MAX_OPT_ARGS];
1302
1303                 if (!*p)
1304                         continue;
1305
1306                 token = match_token(p, tokens, args);
1307                 switch (token) {
1308                 case Opt_hb_local:
1309                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1310                         break;
1311                 case Opt_hb_none:
1312                         mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1313                         break;
1314                 case Opt_hb_global:
1315                         mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1316                         break;
1317                 case Opt_barrier:
1318                         if (match_int(&args[0], &option)) {
1319                                 status = 0;
1320                                 goto bail;
1321                         }
1322                         if (option)
1323                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1324                         else
1325                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1326                         break;
1327                 case Opt_intr:
1328                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1329                         break;
1330                 case Opt_nointr:
1331                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1332                         break;
1333                 case Opt_err_panic:
1334                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1335                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1336                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1337                         break;
1338                 case Opt_err_ro:
1339                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1340                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1341                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_ROFS;
1342                         break;
1343                 case Opt_err_cont:
1344                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1345                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1346                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_CONT;
1347                         break;
1348                 case Opt_data_ordered:
1349                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1350                         break;
1351                 case Opt_data_writeback:
1352                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1353                         break;
1354                 case Opt_user_xattr:
1355                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1356                         break;
1357                 case Opt_nouser_xattr:
1358                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1359                         break;
1360                 case Opt_atime_quantum:
1361                         if (match_int(&args[0], &option)) {
1362                                 status = 0;
1363                                 goto bail;
1364                         }
1365                         if (option >= 0)
1366                                 mopt->atime_quantum = option;
1367                         break;
1368                 case Opt_slot:
1369                         option = 0;
1370                         if (match_int(&args[0], &option)) {
1371                                 status = 0;
1372                                 goto bail;
1373                         }
1374                         if (option)
1375                                 mopt->slot = (u16)option;
1376                         break;
1377                 case Opt_commit:
1378                         option = 0;
1379                         if (match_int(&args[0], &option)) {
1380                                 status = 0;
1381                                 goto bail;
1382                         }
1383                         if (option < 0)
1384                                 return 0;
1385                         if (option == 0)
1386                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1387                         mopt->commit_interval = HZ * option;
1388                         break;
1389                 case Opt_localalloc:
1390                         option = 0;
1391                         if (match_int(&args[0], &option)) {
1392                                 status = 0;
1393                                 goto bail;
1394                         }
1395                         if (option >= 0)
1396                                 mopt->localalloc_opt = option;
1397                         break;
1398                 case Opt_localflocks:
1399                         /*
1400                          * Changing this during remount could race
1401                          * flock() requests, or "unbalance" existing
1402                          * ones (e.g., a lock is taken in one mode but
1403                          * dropped in the other). If users care enough
1404                          * to flip locking modes during remount, we
1405                          * could add a "local" flag to individual
1406                          * flock structures for proper tracking of
1407                          * state.
1408                          */
1409                         if (!is_remount)
1410                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1411                         break;
1412                 case Opt_stack:
1413                         /* Check both that the option we were passed
1414                          * is of the right length and that it is a proper
1415                          * string of the right length.
1416                          */
1417                         if (((args[0].to - args[0].from) !=
1418                              OCFS2_STACK_LABEL_LEN) ||
1419                             (strnlen(args[0].from,
1420                                      OCFS2_STACK_LABEL_LEN) !=
1421                              OCFS2_STACK_LABEL_LEN)) {
1422                                 mlog(ML_ERROR,
1423                                      "Invalid cluster_stack option\n");
1424                                 status = 0;
1425                                 goto bail;
1426                         }
1427                         memcpy(mopt->cluster_stack, args[0].from,
1428                                OCFS2_STACK_LABEL_LEN);
1429                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1430                         /*
1431                          * Open code the memcmp here as we don't have
1432                          * an osb to pass to
1433                          * ocfs2_userspace_stack().
1434                          */
1435                         if (memcmp(mopt->cluster_stack,
1436                                    OCFS2_CLASSIC_CLUSTER_STACK,
1437                                    OCFS2_STACK_LABEL_LEN))
1438                                 user_stack = 1;
1439                         break;
1440                 case Opt_inode64:
1441                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1442                         break;
1443                 case Opt_usrquota:
1444                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1445                         break;
1446                 case Opt_grpquota:
1447                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1448                         break;
1449                 case Opt_coherency_buffered:
1450                         mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1451                         break;
1452                 case Opt_coherency_full:
1453                         mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1454                         break;
1455                 case Opt_acl:
1456                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1457                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1458                         break;
1459                 case Opt_noacl:
1460                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1461                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1462                         break;
1463                 case Opt_resv_level:
1464                         if (is_remount)
1465                                 break;
1466                         if (match_int(&args[0], &option)) {
1467                                 status = 0;
1468                                 goto bail;
1469                         }
1470                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1471                             option < OCFS2_MAX_RESV_LEVEL)
1472                                 mopt->resv_level = option;
1473                         break;
1474                 case Opt_dir_resv_level:
1475                         if (is_remount)
1476                                 break;
1477                         if (match_int(&args[0], &option)) {
1478                                 status = 0;
1479                                 goto bail;
1480                         }
1481                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1482                             option < OCFS2_MAX_RESV_LEVEL)
1483                                 mopt->dir_resv_level = option;
1484                         break;
1485                 case Opt_journal_async_commit:
1486                         mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;
1487                         break;
1488                 default:
1489                         mlog(ML_ERROR,
1490                              "Unrecognized mount option \"%s\" "
1491                              "or missing value\n", p);
1492                         status = 0;
1493                         goto bail;
1494                 }
1495         }
1496
1497         if (user_stack == 0) {
1498                 /* Ensure only one heartbeat mode */
1499                 tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1500                                          OCFS2_MOUNT_HB_GLOBAL |
1501                                          OCFS2_MOUNT_HB_NONE);
1502                 if (hweight32(tmp) != 1) {
1503                         mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1504                         status = 0;
1505                         goto bail;
1506                 }
1507         }
1508
1509         status = 1;
1510
1511 bail:
1512         return status;
1513 }
1514
1515 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1516 {
1517         struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1518         unsigned long opts = osb->s_mount_opt;
1519         unsigned int local_alloc_megs;
1520
1521         if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1522                 seq_printf(s, ",_netdev");
1523                 if (opts & OCFS2_MOUNT_HB_LOCAL)
1524                         seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1525                 else
1526                         seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1527         } else
1528                 seq_printf(s, ",%s", OCFS2_HB_NONE);
1529
1530         if (opts & OCFS2_MOUNT_NOINTR)
1531                 seq_printf(s, ",nointr");
1532
1533         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1534                 seq_printf(s, ",data=writeback");
1535         else
1536                 seq_printf(s, ",data=ordered");
1537
1538         if (opts & OCFS2_MOUNT_BARRIER)
1539                 seq_printf(s, ",barrier=1");
1540
1541         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1542                 seq_printf(s, ",errors=panic");
1543         else if (opts & OCFS2_MOUNT_ERRORS_CONT)
1544                 seq_printf(s, ",errors=continue");
1545         else
1546                 seq_printf(s, ",errors=remount-ro");
1547
1548         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1549                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1550
1551         seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1552
1553         if (osb->osb_commit_interval)
1554                 seq_printf(s, ",commit=%u",
1555                            (unsigned) (osb->osb_commit_interval / HZ));
1556
1557         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1558         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1559                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1560
1561         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1562                 seq_printf(s, ",localflocks,");
1563
1564         if (osb->osb_cluster_stack[0])
1565                 seq_show_option_n(s, "cluster_stack", osb->osb_cluster_stack,
1566                                   OCFS2_STACK_LABEL_LEN);
1567         if (opts & OCFS2_MOUNT_USRQUOTA)
1568                 seq_printf(s, ",usrquota");
1569         if (opts & OCFS2_MOUNT_GRPQUOTA)
1570                 seq_printf(s, ",grpquota");
1571
1572         if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1573                 seq_printf(s, ",coherency=buffered");
1574         else
1575                 seq_printf(s, ",coherency=full");
1576
1577         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1578                 seq_printf(s, ",nouser_xattr");
1579         else
1580                 seq_printf(s, ",user_xattr");
1581
1582         if (opts & OCFS2_MOUNT_INODE64)
1583                 seq_printf(s, ",inode64");
1584
1585         if (opts & OCFS2_MOUNT_POSIX_ACL)
1586                 seq_printf(s, ",acl");
1587         else
1588                 seq_printf(s, ",noacl");
1589
1590         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1591                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1592
1593         if (osb->osb_dir_resv_level != osb->osb_resv_level)
1594                 seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1595
1596         if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
1597                 seq_printf(s, ",journal_async_commit");
1598
1599         return 0;
1600 }
1601
1602 static int __init ocfs2_init(void)
1603 {
1604         int status;
1605
1606         status = init_ocfs2_uptodate_cache();
1607         if (status < 0)
1608                 goto out1;
1609
1610         status = ocfs2_initialize_mem_caches();
1611         if (status < 0)
1612                 goto out2;
1613
1614         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1615         if (!ocfs2_wq) {
1616                 status = -ENOMEM;
1617                 goto out3;
1618         }
1619
1620         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1621         if (!ocfs2_debugfs_root) {
1622                 status = -ENOMEM;
1623                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1624                 goto out4;
1625         }
1626
1627         ocfs2_set_locking_protocol();
1628
1629         status = register_quota_format(&ocfs2_quota_format);
1630         if (status < 0)
1631                 goto out4;
1632         status = register_filesystem(&ocfs2_fs_type);
1633         if (!status)
1634                 return 0;
1635
1636         unregister_quota_format(&ocfs2_quota_format);
1637 out4:
1638         destroy_workqueue(ocfs2_wq);
1639         debugfs_remove(ocfs2_debugfs_root);
1640 out3:
1641         ocfs2_free_mem_caches();
1642 out2:
1643         exit_ocfs2_uptodate_cache();
1644 out1:
1645         mlog_errno(status);
1646         return status;
1647 }
1648
1649 static void __exit ocfs2_exit(void)
1650 {
1651         if (ocfs2_wq) {
1652                 flush_workqueue(ocfs2_wq);
1653                 destroy_workqueue(ocfs2_wq);
1654         }
1655
1656         unregister_quota_format(&ocfs2_quota_format);
1657
1658         debugfs_remove(ocfs2_debugfs_root);
1659
1660         ocfs2_free_mem_caches();
1661
1662         unregister_filesystem(&ocfs2_fs_type);
1663
1664         exit_ocfs2_uptodate_cache();
1665 }
1666
1667 static void ocfs2_put_super(struct super_block *sb)
1668 {
1669         trace_ocfs2_put_super(sb);
1670
1671         ocfs2_sync_blockdev(sb);
1672         ocfs2_dismount_volume(sb, 0);
1673 }
1674
1675 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1676 {
1677         struct ocfs2_super *osb;
1678         u32 numbits, freebits;
1679         int status;
1680         struct ocfs2_dinode *bm_lock;
1681         struct buffer_head *bh = NULL;
1682         struct inode *inode = NULL;
1683
1684         trace_ocfs2_statfs(dentry->d_sb, buf);
1685
1686         osb = OCFS2_SB(dentry->d_sb);
1687
1688         inode = ocfs2_get_system_file_inode(osb,
1689                                             GLOBAL_BITMAP_SYSTEM_INODE,
1690                                             OCFS2_INVALID_SLOT);
1691         if (!inode) {
1692                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1693                 status = -EIO;
1694                 goto bail;
1695         }
1696
1697         status = ocfs2_inode_lock(inode, &bh, 0);
1698         if (status < 0) {
1699                 mlog_errno(status);
1700                 goto bail;
1701         }
1702
1703         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1704
1705         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1706         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1707
1708         buf->f_type = OCFS2_SUPER_MAGIC;
1709         buf->f_bsize = dentry->d_sb->s_blocksize;
1710         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1711         buf->f_blocks = ((sector_t) numbits) *
1712                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1713         buf->f_bfree = ((sector_t) freebits) *
1714                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1715         buf->f_bavail = buf->f_bfree;
1716         buf->f_files = numbits;
1717         buf->f_ffree = freebits;
1718         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1719                                 & 0xFFFFFFFFUL;
1720         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1721                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1722
1723         brelse(bh);
1724
1725         ocfs2_inode_unlock(inode, 0);
1726         status = 0;
1727 bail:
1728         if (inode)
1729                 iput(inode);
1730
1731         if (status)
1732                 mlog_errno(status);
1733
1734         return status;
1735 }
1736
1737 static void ocfs2_inode_init_once(void *data)
1738 {
1739         struct ocfs2_inode_info *oi = data;
1740
1741         oi->ip_flags = 0;
1742         oi->ip_open_count = 0;
1743         spin_lock_init(&oi->ip_lock);
1744         ocfs2_extent_map_init(&oi->vfs_inode);
1745         INIT_LIST_HEAD(&oi->ip_io_markers);
1746         oi->ip_dir_start_lookup = 0;
1747         mutex_init(&oi->ip_unaligned_aio);
1748         init_rwsem(&oi->ip_alloc_sem);
1749         init_rwsem(&oi->ip_xattr_sem);
1750         mutex_init(&oi->ip_io_mutex);
1751
1752         oi->ip_blkno = 0ULL;
1753         oi->ip_clusters = 0;
1754         oi->ip_next_orphan = NULL;
1755
1756         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1757
1758         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1759         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1760         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1761
1762         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1763                                   &ocfs2_inode_caching_ops);
1764
1765         inode_init_once(&oi->vfs_inode);
1766 }
1767
1768 static int ocfs2_initialize_mem_caches(void)
1769 {
1770         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1771                                        sizeof(struct ocfs2_inode_info),
1772                                        0,
1773                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1774                                                 SLAB_MEM_SPREAD),
1775                                        ocfs2_inode_init_once);
1776         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1777                                         sizeof(struct ocfs2_dquot),
1778                                         0,
1779                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1780                                                 SLAB_MEM_SPREAD),
1781                                         NULL);
1782         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1783                                         sizeof(struct ocfs2_quota_chunk),
1784                                         0,
1785                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1786                                         NULL);
1787         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1788             !ocfs2_qf_chunk_cachep) {
1789                 if (ocfs2_inode_cachep)
1790                         kmem_cache_destroy(ocfs2_inode_cachep);
1791                 if (ocfs2_dquot_cachep)
1792                         kmem_cache_destroy(ocfs2_dquot_cachep);
1793                 if (ocfs2_qf_chunk_cachep)
1794                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1795                 return -ENOMEM;
1796         }
1797
1798         return 0;
1799 }
1800
1801 static void ocfs2_free_mem_caches(void)
1802 {
1803         /*
1804          * Make sure all delayed rcu free inodes are flushed before we
1805          * destroy cache.
1806          */
1807         rcu_barrier();
1808         if (ocfs2_inode_cachep)
1809                 kmem_cache_destroy(ocfs2_inode_cachep);
1810         ocfs2_inode_cachep = NULL;
1811
1812         if (ocfs2_dquot_cachep)
1813                 kmem_cache_destroy(ocfs2_dquot_cachep);
1814         ocfs2_dquot_cachep = NULL;
1815
1816         if (ocfs2_qf_chunk_cachep)
1817                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1818         ocfs2_qf_chunk_cachep = NULL;
1819 }
1820
1821 static int ocfs2_get_sector(struct super_block *sb,
1822                             struct buffer_head **bh,
1823                             int block,
1824                             int sect_size)
1825 {
1826         if (!sb_set_blocksize(sb, sect_size)) {
1827                 mlog(ML_ERROR, "unable to set blocksize\n");
1828                 return -EIO;
1829         }
1830
1831         *bh = sb_getblk(sb, block);
1832         if (!*bh) {
1833                 mlog_errno(-ENOMEM);
1834                 return -ENOMEM;
1835         }
1836         lock_buffer(*bh);
1837         if (!buffer_dirty(*bh))
1838                 clear_buffer_uptodate(*bh);
1839         unlock_buffer(*bh);
1840         ll_rw_block(READ, 1, bh);
1841         wait_on_buffer(*bh);
1842         if (!buffer_uptodate(*bh)) {
1843                 mlog_errno(-EIO);
1844                 brelse(*bh);
1845                 *bh = NULL;
1846                 return -EIO;
1847         }
1848
1849         return 0;
1850 }
1851
1852 static int ocfs2_mount_volume(struct super_block *sb)
1853 {
1854         int status = 0;
1855         int unlock_super = 0;
1856         struct ocfs2_super *osb = OCFS2_SB(sb);
1857
1858         if (ocfs2_is_hard_readonly(osb))
1859                 goto leave;
1860
1861         status = ocfs2_dlm_init(osb);
1862         if (status < 0) {
1863                 mlog_errno(status);
1864                 goto leave;
1865         }
1866
1867         status = ocfs2_super_lock(osb, 1);
1868         if (status < 0) {
1869                 mlog_errno(status);
1870                 goto leave;
1871         }
1872         unlock_super = 1;
1873
1874         /* This will load up the node map and add ourselves to it. */
1875         status = ocfs2_find_slot(osb);
1876         if (status < 0) {
1877                 mlog_errno(status);
1878                 goto leave;
1879         }
1880
1881         /* load all node-local system inodes */
1882         status = ocfs2_init_local_system_inodes(osb);
1883         if (status < 0) {
1884                 mlog_errno(status);
1885                 goto leave;
1886         }
1887
1888         status = ocfs2_check_volume(osb);
1889         if (status < 0) {
1890                 mlog_errno(status);
1891                 goto leave;
1892         }
1893
1894         status = ocfs2_truncate_log_init(osb);
1895         if (status < 0)
1896                 mlog_errno(status);
1897
1898 leave:
1899         if (unlock_super)
1900                 ocfs2_super_unlock(osb, 1);
1901
1902         return status;
1903 }
1904
1905 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1906 {
1907         int tmp, hangup_needed = 0;
1908         struct ocfs2_super *osb = NULL;
1909         char nodestr[12];
1910
1911         trace_ocfs2_dismount_volume(sb);
1912
1913         BUG_ON(!sb);
1914         osb = OCFS2_SB(sb);
1915         BUG_ON(!osb);
1916
1917         debugfs_remove(osb->osb_ctxt);
1918
1919         /* Orphan scan should be stopped as early as possible */
1920         ocfs2_orphan_scan_stop(osb);
1921
1922         ocfs2_disable_quotas(osb);
1923
1924         /* All dquots should be freed by now */
1925         WARN_ON(!llist_empty(&osb->dquot_drop_list));
1926         /* Wait for worker to be done with the work structure in osb */
1927         cancel_work_sync(&osb->dquot_drop_work);
1928
1929         ocfs2_shutdown_local_alloc(osb);
1930
1931         ocfs2_truncate_log_shutdown(osb);
1932
1933         /* This will disable recovery and flush any recovery work. */
1934         ocfs2_recovery_exit(osb);
1935
1936         ocfs2_journal_shutdown(osb);
1937
1938         ocfs2_sync_blockdev(sb);
1939
1940         ocfs2_purge_refcount_trees(osb);
1941
1942         /* No cluster connection means we've failed during mount, so skip
1943          * all the steps which depended on that to complete. */
1944         if (osb->cconn) {
1945                 tmp = ocfs2_super_lock(osb, 1);
1946                 if (tmp < 0) {
1947                         mlog_errno(tmp);
1948                         return;
1949                 }
1950         }
1951
1952         if (osb->slot_num != OCFS2_INVALID_SLOT)
1953                 ocfs2_put_slot(osb);
1954
1955         if (osb->cconn)
1956                 ocfs2_super_unlock(osb, 1);
1957
1958         ocfs2_release_system_inodes(osb);
1959
1960         /*
1961          * If we're dismounting due to mount error, mount.ocfs2 will clean
1962          * up heartbeat.  If we're a local mount, there is no heartbeat.
1963          * If we failed before we got a uuid_str yet, we can't stop
1964          * heartbeat.  Otherwise, do it.
1965          */
1966         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1967             !ocfs2_is_hard_readonly(osb))
1968                 hangup_needed = 1;
1969
1970         if (osb->cconn)
1971                 ocfs2_dlm_shutdown(osb, hangup_needed);
1972
1973         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1974         debugfs_remove(osb->osb_debug_root);
1975
1976         if (hangup_needed)
1977                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1978
1979         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1980
1981         if (ocfs2_mount_local(osb))
1982                 snprintf(nodestr, sizeof(nodestr), "local");
1983         else
1984                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1985
1986         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1987                osb->dev_str, nodestr);
1988
1989         ocfs2_delete_osb(osb);
1990         kfree(osb);
1991         sb->s_dev = 0;
1992         sb->s_fs_info = NULL;
1993 }
1994
1995 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1996                                 unsigned uuid_bytes)
1997 {
1998         int i, ret;
1999         char *ptr;
2000
2001         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2002
2003         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2004         if (osb->uuid_str == NULL)
2005                 return -ENOMEM;
2006
2007         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2008                 /* print with null */
2009                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
2010                 if (ret != 2) /* drop super cleans up */
2011                         return -EINVAL;
2012                 /* then only advance past the last char */
2013                 ptr += 2;
2014         }
2015
2016         return 0;
2017 }
2018
2019 /* Make sure entire volume is addressable by our journal.  Requires
2020    osb_clusters_at_boot to be valid and for the journal to have been
2021    initialized by ocfs2_journal_init(). */
2022 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2023 {
2024         int status = 0;
2025         u64 max_block =
2026                 ocfs2_clusters_to_blocks(osb->sb,
2027                                          osb->osb_clusters_at_boot) - 1;
2028
2029         /* 32-bit block number is always OK. */
2030         if (max_block <= (u32)~0ULL)
2031                 goto out;
2032
2033         /* Volume is "huge", so see if our journal is new enough to
2034            support it. */
2035         if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2036                                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2037               jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2038                                                JBD2_FEATURE_INCOMPAT_64BIT))) {
2039                 mlog(ML_ERROR, "The journal cannot address the entire volume. "
2040                      "Enable the 'block64' journal option with tunefs.ocfs2");
2041                 status = -EFBIG;
2042                 goto out;
2043         }
2044
2045  out:
2046         return status;
2047 }
2048
2049 static int ocfs2_initialize_super(struct super_block *sb,
2050                                   struct buffer_head *bh,
2051                                   int sector_size,
2052                                   struct ocfs2_blockcheck_stats *stats)
2053 {
2054         int status;
2055         int i, cbits, bbits;
2056         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2057         struct inode *inode = NULL;
2058         struct ocfs2_journal *journal;
2059         struct ocfs2_super *osb;
2060         u64 total_blocks;
2061
2062         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2063         if (!osb) {
2064                 status = -ENOMEM;
2065                 mlog_errno(status);
2066                 goto bail;
2067         }
2068
2069         sb->s_fs_info = osb;
2070         sb->s_op = &ocfs2_sops;
2071         sb->s_d_op = &ocfs2_dentry_ops;
2072         sb->s_export_op = &ocfs2_export_ops;
2073         sb->s_qcop = &dquot_quotactl_sysfile_ops;
2074         sb->dq_op = &ocfs2_quota_operations;
2075         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
2076         sb->s_xattr = ocfs2_xattr_handlers;
2077         sb->s_time_gran = 1;
2078         sb->s_flags |= MS_NOATIME;
2079         /* this is needed to support O_LARGEFILE */
2080         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2081         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2082         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2083         memcpy(sb->s_uuid, di->id2.i_super.s_uuid,
2084                sizeof(di->id2.i_super.s_uuid));
2085
2086         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2087
2088         for (i = 0; i < 3; i++)
2089                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2090         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2091
2092         osb->sb = sb;
2093         /* Save off for ocfs2_rw_direct */
2094         osb->s_sectsize_bits = blksize_bits(sector_size);
2095         BUG_ON(!osb->s_sectsize_bits);
2096
2097         spin_lock_init(&osb->dc_task_lock);
2098         init_waitqueue_head(&osb->dc_event);
2099         osb->dc_work_sequence = 0;
2100         osb->dc_wake_sequence = 0;
2101         INIT_LIST_HEAD(&osb->blocked_lock_list);
2102         osb->blocked_lock_count = 0;
2103         spin_lock_init(&osb->osb_lock);
2104         spin_lock_init(&osb->osb_xattr_lock);
2105         ocfs2_init_steal_slots(osb);
2106
2107         mutex_init(&osb->system_file_mutex);
2108
2109         atomic_set(&osb->alloc_stats.moves, 0);
2110         atomic_set(&osb->alloc_stats.local_data, 0);
2111         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2112         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2113         atomic_set(&osb->alloc_stats.bg_extends, 0);
2114
2115         /* Copy the blockcheck stats from the superblock probe */
2116         osb->osb_ecc_stats = *stats;
2117
2118         ocfs2_init_node_maps(osb);
2119
2120         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2121                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2122
2123         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2124         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2125                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2126                      osb->max_slots);
2127                 status = -EINVAL;
2128                 goto bail;
2129         }
2130
2131         ocfs2_orphan_scan_init(osb);
2132
2133         status = ocfs2_recovery_init(osb);
2134         if (status) {
2135                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2136                 mlog_errno(status);
2137                 goto bail;
2138         }
2139
2140         init_waitqueue_head(&osb->checkpoint_event);
2141
2142         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2143
2144         osb->slot_num = OCFS2_INVALID_SLOT;
2145
2146         osb->s_xattr_inline_size = le16_to_cpu(
2147                                         di->id2.i_super.s_xattr_inline_size);
2148
2149         osb->local_alloc_state = OCFS2_LA_UNUSED;
2150         osb->local_alloc_bh = NULL;
2151         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2152
2153         init_waitqueue_head(&osb->osb_mount_event);
2154
2155         status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2156         if (status) {
2157                 mlog_errno(status);
2158                 goto bail;
2159         }
2160
2161         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2162         if (!osb->vol_label) {
2163                 mlog(ML_ERROR, "unable to alloc vol label\n");
2164                 status = -ENOMEM;
2165                 goto bail;
2166         }
2167
2168         osb->slot_recovery_generations =
2169                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2170                         GFP_KERNEL);
2171         if (!osb->slot_recovery_generations) {
2172                 status = -ENOMEM;
2173                 mlog_errno(status);
2174                 goto bail;
2175         }
2176
2177         init_waitqueue_head(&osb->osb_wipe_event);
2178         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2179                                         sizeof(*osb->osb_orphan_wipes),
2180                                         GFP_KERNEL);
2181         if (!osb->osb_orphan_wipes) {
2182                 status = -ENOMEM;
2183                 mlog_errno(status);
2184                 goto bail;
2185         }
2186
2187         osb->osb_rf_lock_tree = RB_ROOT;
2188
2189         osb->s_feature_compat =
2190                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2191         osb->s_feature_ro_compat =
2192                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2193         osb->s_feature_incompat =
2194                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2195
2196         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2197                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2198                      "optional features (%x).\n", i);
2199                 status = -EINVAL;
2200                 goto bail;
2201         }
2202         if (!(osb->sb->s_flags & MS_RDONLY) &&
2203             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2204                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2205                      "unsupported optional features (%x).\n", i);
2206                 status = -EINVAL;
2207                 goto bail;
2208         }
2209
2210         if (ocfs2_clusterinfo_valid(osb)) {
2211                 osb->osb_stackflags =
2212                         OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2213                 strlcpy(osb->osb_cluster_stack,
2214                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2215                        OCFS2_STACK_LABEL_LEN + 1);
2216                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2217                         mlog(ML_ERROR,
2218                              "couldn't mount because of an invalid "
2219                              "cluster stack label (%s) \n",
2220                              osb->osb_cluster_stack);
2221                         status = -EINVAL;
2222                         goto bail;
2223                 }
2224                 strlcpy(osb->osb_cluster_name,
2225                         OCFS2_RAW_SB(di)->s_cluster_info.ci_cluster,
2226                         OCFS2_CLUSTER_NAME_LEN + 1);
2227         } else {
2228                 /* The empty string is identical with classic tools that
2229                  * don't know about s_cluster_info. */
2230                 osb->osb_cluster_stack[0] = '\0';
2231         }
2232
2233         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2234
2235         /* FIXME
2236          * This should be done in ocfs2_journal_init(), but unknown
2237          * ordering issues will cause the filesystem to crash.
2238          * If anyone wants to figure out what part of the code
2239          * refers to osb->journal before ocfs2_journal_init() is run,
2240          * be my guest.
2241          */
2242         /* initialize our journal structure */
2243
2244         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2245         if (!journal) {
2246                 mlog(ML_ERROR, "unable to alloc journal\n");
2247                 status = -ENOMEM;
2248                 goto bail;
2249         }
2250         osb->journal = journal;
2251         journal->j_osb = osb;
2252
2253         atomic_set(&journal->j_num_trans, 0);
2254         init_rwsem(&journal->j_trans_barrier);
2255         init_waitqueue_head(&journal->j_checkpointed);
2256         spin_lock_init(&journal->j_lock);
2257         journal->j_trans_id = (unsigned long) 1;
2258         INIT_LIST_HEAD(&journal->j_la_cleanups);
2259         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2260         journal->j_state = OCFS2_JOURNAL_FREE;
2261
2262         INIT_WORK(&osb->dquot_drop_work, ocfs2_drop_dquot_refs);
2263         init_llist_head(&osb->dquot_drop_list);
2264
2265         /* get some pseudo constants for clustersize bits */
2266         osb->s_clustersize_bits =
2267                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2268         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2269
2270         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2271             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2272                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2273                      osb->s_clustersize);
2274                 status = -EINVAL;
2275                 goto bail;
2276         }
2277
2278         total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2279                                                 le32_to_cpu(di->i_clusters));
2280
2281         status = generic_check_addressable(osb->sb->s_blocksize_bits,
2282                                            total_blocks);
2283         if (status) {
2284                 mlog(ML_ERROR, "Volume too large "
2285                      "to mount safely on this system");
2286                 status = -EFBIG;
2287                 goto bail;
2288         }
2289
2290         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2291                                  sizeof(di->id2.i_super.s_uuid))) {
2292                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2293                 status = -ENOMEM;
2294                 goto bail;
2295         }
2296
2297         strlcpy(osb->vol_label, di->id2.i_super.s_label,
2298                 OCFS2_MAX_VOL_LABEL_LEN);
2299         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2300         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2301         osb->first_cluster_group_blkno =
2302                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2303         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2304         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2305         trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2306                                      (unsigned long long)osb->root_blkno,
2307                                      (unsigned long long)osb->system_dir_blkno,
2308                                      osb->s_clustersize_bits);
2309
2310         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2311         if (!osb->osb_dlm_debug) {
2312                 status = -ENOMEM;
2313                 mlog_errno(status);
2314                 goto bail;
2315         }
2316
2317         atomic_set(&osb->vol_state, VOLUME_INIT);
2318
2319         /* load root, system_dir, and all global system inodes */
2320         status = ocfs2_init_global_system_inodes(osb);
2321         if (status < 0) {
2322                 mlog_errno(status);
2323                 goto bail;
2324         }
2325
2326         /*
2327          * global bitmap
2328          */
2329         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2330                                             OCFS2_INVALID_SLOT);
2331         if (!inode) {
2332                 status = -EINVAL;
2333                 mlog_errno(status);
2334                 goto bail;
2335         }
2336
2337         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2338         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2339         iput(inode);
2340
2341         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2342                                  osb->s_feature_incompat) * 8;
2343
2344         status = ocfs2_init_slot_info(osb);
2345         if (status < 0) {
2346                 mlog_errno(status);
2347                 goto bail;
2348         }
2349         cleancache_init_shared_fs(sb);
2350
2351 bail:
2352         return status;
2353 }
2354
2355 /*
2356  * will return: -EAGAIN if it is ok to keep searching for superblocks
2357  *              -EINVAL if there is a bad superblock
2358  *              0 on success
2359  */
2360 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2361                                struct buffer_head *bh,
2362                                u32 blksz,
2363                                struct ocfs2_blockcheck_stats *stats)
2364 {
2365         int status = -EAGAIN;
2366
2367         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2368                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2369                 /* We have to do a raw check of the feature here */
2370                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2371                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2372                         status = ocfs2_block_check_validate(bh->b_data,
2373                                                             bh->b_size,
2374                                                             &di->i_check,
2375                                                             stats);
2376                         if (status)
2377                                 goto out;
2378                 }
2379                 status = -EINVAL;
2380                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2381                         mlog(ML_ERROR, "found superblock with incorrect block "
2382                              "size: found %u, should be %u\n",
2383                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2384                                blksz);
2385                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2386                            OCFS2_MAJOR_REV_LEVEL ||
2387                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2388                            OCFS2_MINOR_REV_LEVEL) {
2389                         mlog(ML_ERROR, "found superblock with bad version: "
2390                              "found %u.%u, should be %u.%u\n",
2391                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2392                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2393                              OCFS2_MAJOR_REV_LEVEL,
2394                              OCFS2_MINOR_REV_LEVEL);
2395                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2396                         mlog(ML_ERROR, "bad block number on superblock: "
2397                              "found %llu, should be %llu\n",
2398                              (unsigned long long)le64_to_cpu(di->i_blkno),
2399                              (unsigned long long)bh->b_blocknr);
2400                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2401                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2402                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2403                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2404                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2405                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2406                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2407                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2408                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2409                         mlog(ML_ERROR,
2410                              "Superblock slots found greater than file system "
2411                              "maximum: found %u, max %u\n",
2412                              le16_to_cpu(di->id2.i_super.s_max_slots),
2413                              OCFS2_MAX_SLOTS);
2414                 } else {
2415                         /* found it! */
2416                         status = 0;
2417                 }
2418         }
2419
2420 out:
2421         if (status && status != -EAGAIN)
2422                 mlog_errno(status);
2423         return status;
2424 }
2425
2426 static int ocfs2_check_volume(struct ocfs2_super *osb)
2427 {
2428         int status;
2429         int dirty;
2430         int local;
2431         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2432                                                   * recover
2433                                                   * ourselves. */
2434
2435         /* Init our journal object. */
2436         status = ocfs2_journal_init(osb->journal, &dirty);
2437         if (status < 0) {
2438                 mlog(ML_ERROR, "Could not initialize journal!\n");
2439                 goto finally;
2440         }
2441
2442         /* Now that journal has been initialized, check to make sure
2443            entire volume is addressable. */
2444         status = ocfs2_journal_addressable(osb);
2445         if (status)
2446                 goto finally;
2447
2448         /* If the journal was unmounted cleanly then we don't want to
2449          * recover anything. Otherwise, journal_load will do that
2450          * dirty work for us :) */
2451         if (!dirty) {
2452                 status = ocfs2_journal_wipe(osb->journal, 0);
2453                 if (status < 0) {
2454                         mlog_errno(status);
2455                         goto finally;
2456                 }
2457         } else {
2458                 printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2459                        "unmounted cleanly, recovering it.\n", osb->dev_str);
2460         }
2461
2462         local = ocfs2_mount_local(osb);
2463
2464         /* will play back anything left in the journal. */
2465         status = ocfs2_journal_load(osb->journal, local, dirty);
2466         if (status < 0) {
2467                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2468                 goto finally;
2469         }
2470
2471         if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
2472                 jbd2_journal_set_features(osb->journal->j_journal,
2473                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2474                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2475         else
2476                 jbd2_journal_clear_features(osb->journal->j_journal,
2477                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2478                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2479
2480         if (dirty) {
2481                 /* recover my local alloc if we didn't unmount cleanly. */
2482                 status = ocfs2_begin_local_alloc_recovery(osb,
2483                                                           osb->slot_num,
2484                                                           &local_alloc);
2485                 if (status < 0) {
2486                         mlog_errno(status);
2487                         goto finally;
2488                 }
2489                 /* we complete the recovery process after we've marked
2490                  * ourselves as mounted. */
2491         }
2492
2493         status = ocfs2_load_local_alloc(osb);
2494         if (status < 0) {
2495                 mlog_errno(status);
2496                 goto finally;
2497         }
2498
2499         if (dirty) {
2500                 /* Recovery will be completed after we've mounted the
2501                  * rest of the volume. */
2502                 osb->dirty = 1;
2503                 osb->local_alloc_copy = local_alloc;
2504                 local_alloc = NULL;
2505         }
2506
2507         /* go through each journal, trylock it and if you get the
2508          * lock, and it's marked as dirty, set the bit in the recover
2509          * map and launch a recovery thread for it. */
2510         status = ocfs2_mark_dead_nodes(osb);
2511         if (status < 0) {
2512                 mlog_errno(status);
2513                 goto finally;
2514         }
2515
2516         status = ocfs2_compute_replay_slots(osb);
2517         if (status < 0)
2518                 mlog_errno(status);
2519
2520 finally:
2521         kfree(local_alloc);
2522
2523         if (status)
2524                 mlog_errno(status);
2525         return status;
2526 }
2527
2528 /*
2529  * The routine gets called from dismount or close whenever a dismount on
2530  * volume is requested and the osb open count becomes 1.
2531  * It will remove the osb from the global list and also free up all the
2532  * initialized resources and fileobject.
2533  */
2534 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2535 {
2536         /* This function assumes that the caller has the main osb resource */
2537
2538         ocfs2_free_slot_info(osb);
2539
2540         kfree(osb->osb_orphan_wipes);
2541         kfree(osb->slot_recovery_generations);
2542         /* FIXME
2543          * This belongs in journal shutdown, but because we have to
2544          * allocate osb->journal at the start of ocfs2_initialize_osb(),
2545          * we free it here.
2546          */
2547         kfree(osb->journal);
2548         kfree(osb->local_alloc_copy);
2549         kfree(osb->uuid_str);
2550         kfree(osb->vol_label);
2551         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2552         memset(osb, 0, sizeof(struct ocfs2_super));
2553 }
2554
2555 /* Depending on the mount option passed, perform one of the following:
2556  * Put OCFS2 into a readonly state (default)
2557  * Return EIO so that only the process errs
2558  * Fix the error as if fsck.ocfs2 -y
2559  * panic
2560  */
2561 static int ocfs2_handle_error(struct super_block *sb)
2562 {
2563         struct ocfs2_super *osb = OCFS2_SB(sb);
2564         int rv = 0;
2565
2566         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2567         pr_crit("On-disk corruption discovered. "
2568                 "Please run fsck.ocfs2 once the filesystem is unmounted.\n");
2569
2570         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) {
2571                 panic("OCFS2: (device %s): panic forced after error\n",
2572                       sb->s_id);
2573         } else if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_CONT) {
2574                 pr_crit("OCFS2: Returning error to the calling process.\n");
2575                 rv = -EIO;
2576         } else { /* default option */
2577                 rv = -EROFS;
2578                 if (sb->s_flags & MS_RDONLY &&
2579                                 (ocfs2_is_soft_readonly(osb) ||
2580                                  ocfs2_is_hard_readonly(osb)))
2581                         return rv;
2582
2583                 pr_crit("OCFS2: File system is now read-only.\n");
2584                 sb->s_flags |= MS_RDONLY;
2585                 ocfs2_set_ro_flag(osb, 0);
2586         }
2587
2588         return rv;
2589 }
2590
2591 int __ocfs2_error(struct super_block *sb, const char *function,
2592                   const char *fmt, ...)
2593 {
2594         struct va_format vaf;
2595         va_list args;
2596
2597         va_start(args, fmt);
2598         vaf.fmt = fmt;
2599         vaf.va = &args;
2600
2601         /* Not using mlog here because we want to show the actual
2602          * function the error came from. */
2603         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %pV",
2604                sb->s_id, function, &vaf);
2605
2606         va_end(args);
2607
2608         return ocfs2_handle_error(sb);
2609 }
2610
2611 /* Handle critical errors. This is intentionally more drastic than
2612  * ocfs2_handle_error, so we only use for things like journal errors,
2613  * etc. */
2614 void __ocfs2_abort(struct super_block *sb, const char *function,
2615                    const char *fmt, ...)
2616 {
2617         struct va_format vaf;
2618         va_list args;
2619
2620         va_start(args, fmt);
2621
2622         vaf.fmt = fmt;
2623         vaf.va = &args;
2624
2625         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %pV",
2626                sb->s_id, function, &vaf);
2627
2628         va_end(args);
2629
2630         /* We don't have the cluster support yet to go straight to
2631          * hard readonly in here. Until then, we want to keep
2632          * ocfs2_abort() so that we can at least mark critical
2633          * errors.
2634          *
2635          * TODO: This should abort the journal and alert other nodes
2636          * that our slot needs recovery. */
2637
2638         /* Force a panic(). This stinks, but it's better than letting
2639          * things continue without having a proper hard readonly
2640          * here. */
2641         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2642                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2643         ocfs2_handle_error(sb);
2644 }
2645
2646 /*
2647  * Void signal blockers, because in-kernel sigprocmask() only fails
2648  * when SIG_* is wrong.
2649  */
2650 void ocfs2_block_signals(sigset_t *oldset)
2651 {
2652         int rc;
2653         sigset_t blocked;
2654
2655         sigfillset(&blocked);
2656         rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2657         BUG_ON(rc);
2658 }
2659
2660 void ocfs2_unblock_signals(sigset_t *oldset)
2661 {
2662         int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2663         BUG_ON(rc);
2664 }
2665
2666 module_init(ocfs2_init);
2667 module_exit(ocfs2_exit);