fs/ocfs2/super.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * super.c
   4  *
   5  * load/unload driver, mount/dismount volumes
   6  *
   7  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/fs.h>
  12 #include <linux/types.h>
  13 #include <linux/slab.h>
  14 #include <linux/highmem.h>
  15 #include <linux/init.h>
  16 #include <linux/random.h>
  17 #include <linux/statfs.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/socket.h>
  21 #include <linux/inet.h>
  22 #include <linux/parser.h>
  23 #include <linux/crc32.h>
  24 #include <linux/debugfs.h>
  25 #include <linux/mount.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/quotaops.h>
  28 #include <linux/signal.h>
  29
  30 #define CREATE_TRACE_POINTS
  31 #include "ocfs2_trace.h"
  32
  33 #include <cluster/masklog.h>
  34
  35 #include "ocfs2.h"
  36
  37 /* this should be the only file to include a version 1 header */
  38 #include "ocfs1_fs_compat.h"
  39
  40 #include "alloc.h"
  41 #include "aops.h"
  42 #include "blockcheck.h"
  43 #include "dlmglue.h"
  44 #include "export.h"
  45 #include "extent_map.h"
  46 #include "heartbeat.h"
  47 #include "inode.h"
  48 #include "journal.h"
  49 #include "localalloc.h"
  50 #include "namei.h"
  51 #include "slot_map.h"
  52 #include "super.h"
  53 #include "sysfile.h"
  54 #include "uptodate.h"
  55 #include "xattr.h"
  56 #include "quota.h"
  57 #include "refcounttree.h"
  58 #include "suballoc.h"
  59
  60 #include "buffer_head_io.h"
  61 #include "filecheck.h"
  62
  63 static struct kmem_cache *ocfs2_inode_cachep;
  64 struct kmem_cache *ocfs2_dquot_cachep;
  65 struct kmem_cache *ocfs2_qf_chunk_cachep;
  66
  67 static struct dentry *ocfs2_debugfs_root;
  68
  69 MODULE_AUTHOR("Oracle");
  70 MODULE_LICENSE("GPL");
  71 MODULE_DESCRIPTION("OCFS2 cluster file system");
  72
  73 struct mount_options
  74 {
  75         unsigned long   commit_interval;
  76         unsigned long   mount_opt;
  77         unsigned int    atime_quantum;
  78         unsigned short  slot;
  79         int             localalloc_opt;
  80         unsigned int    resv_level;
  81         int             dir_resv_level;
  82         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  83 };
  84
  85 static int ocfs2_parse_options(struct super_block *sb, char *options,
  86                                struct mount_options *mopt,
  87                                int is_remount);
  88 static int ocfs2_check_set_options(struct super_block *sb,
  89                                    struct mount_options *options);
  90 static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
  91 static void ocfs2_put_super(struct super_block *sb);
  92 static int ocfs2_mount_volume(struct super_block *sb);
  93 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
  94 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
  95 static int ocfs2_initialize_mem_caches(void);
  96 static void ocfs2_free_mem_caches(void);
  97 static void ocfs2_delete_osb(struct ocfs2_super *osb);
  98
  99 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 100
 101 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 102
 103 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 104 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 105 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 106 static int ocfs2_check_volume(struct ocfs2_super *osb);
 107 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 108                                struct buffer_head *bh,
 109                                u32 sectsize,
 110                                struct ocfs2_blockcheck_stats *stats);
 111 static int ocfs2_initialize_super(struct super_block *sb,
 112                                   struct buffer_head *bh,
 113                                   int sector_size,
 114                                   struct ocfs2_blockcheck_stats *stats);
 115 static int ocfs2_get_sector(struct super_block *sb,
 116                             struct buffer_head **bh,
 117                             int block,
 118                             int sect_size);
 119 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 120 static void ocfs2_free_inode(struct inode *inode);
 121 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 122 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 123 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 124
 125 static struct dquot **ocfs2_get_dquots(struct inode *inode)
 126 {
 127         return OCFS2_I(inode)->i_dquot;
 128 }
 129
 130 static const struct super_operations ocfs2_sops = {
 131         .statfs         = ocfs2_statfs,
 132         .alloc_inode    = ocfs2_alloc_inode,
 133         .free_inode     = ocfs2_free_inode,
 134         .drop_inode     = ocfs2_drop_inode,
 135         .evict_inode    = ocfs2_evict_inode,
 136         .sync_fs        = ocfs2_sync_fs,
 137         .put_super      = ocfs2_put_super,
 138         .remount_fs     = ocfs2_remount,
 139         .show_options   = ocfs2_show_options,
 140         .quota_read     = ocfs2_quota_read,
 141         .quota_write    = ocfs2_quota_write,
 142         .get_dquots     = ocfs2_get_dquots,
 143 };
 144
 145 enum {
 146         Opt_barrier,
 147         Opt_err_panic,
 148         Opt_err_ro,
 149         Opt_intr,
 150         Opt_nointr,
 151         Opt_hb_none,
 152         Opt_hb_local,
 153         Opt_hb_global,
 154         Opt_data_ordered,
 155         Opt_data_writeback,
 156         Opt_atime_quantum,
 157         Opt_slot,
 158         Opt_commit,
 159         Opt_localalloc,
 160         Opt_localflocks,
 161         Opt_stack,
 162         Opt_user_xattr,
 163         Opt_nouser_xattr,
 164         Opt_inode64,
 165         Opt_acl,
 166         Opt_noacl,
 167         Opt_usrquota,
 168         Opt_grpquota,
 169         Opt_coherency_buffered,
 170         Opt_coherency_full,
 171         Opt_resv_level,
 172         Opt_dir_resv_level,
 173         Opt_journal_async_commit,
 174         Opt_err_cont,
 175         Opt_err,
 176 };
 177
 178 static const match_table_t tokens = {
 179         {Opt_barrier, "barrier=%u"},
 180         {Opt_err_panic, "errors=panic"},
 181         {Opt_err_ro, "errors=remount-ro"},
 182         {Opt_intr, "intr"},
 183         {Opt_nointr, "nointr"},
 184         {Opt_hb_none, OCFS2_HB_NONE},
 185         {Opt_hb_local, OCFS2_HB_LOCAL},
 186         {Opt_hb_global, OCFS2_HB_GLOBAL},
 187         {Opt_data_ordered, "data=ordered"},
 188         {Opt_data_writeback, "data=writeback"},
 189         {Opt_atime_quantum, "atime_quantum=%u"},
 190         {Opt_slot, "preferred_slot=%u"},
 191         {Opt_commit, "commit=%u"},
 192         {Opt_localalloc, "localalloc=%d"},
 193         {Opt_localflocks, "localflocks"},
 194         {Opt_stack, "cluster_stack=%s"},
 195         {Opt_user_xattr, "user_xattr"},
 196         {Opt_nouser_xattr, "nouser_xattr"},
 197         {Opt_inode64, "inode64"},
 198         {Opt_acl, "acl"},
 199         {Opt_noacl, "noacl"},
 200         {Opt_usrquota, "usrquota"},
 201         {Opt_grpquota, "grpquota"},
 202         {Opt_coherency_buffered, "coherency=buffered"},
 203         {Opt_coherency_full, "coherency=full"},
 204         {Opt_resv_level, "resv_level=%u"},
 205         {Opt_dir_resv_level, "dir_resv_level=%u"},
 206         {Opt_journal_async_commit, "journal_async_commit"},
 207         {Opt_err_cont, "errors=continue"},
 208         {Opt_err, NULL}
 209 };
 210
 211 #ifdef CONFIG_DEBUG_FS
 212 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 213 {
 214         struct ocfs2_cluster_connection *cconn = osb->cconn;
 215         struct ocfs2_recovery_map *rm = osb->recovery_map;
 216         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 217         int i, out = 0;
 218         unsigned long flags;
 219
 220         out += scnprintf(buf + out, len - out,
 221                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 222                         "Device", osb->dev_str, osb->uuid_str,
 223                         osb->fs_generation, osb->vol_label);
 224
 225         out += scnprintf(buf + out, len - out,
 226                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 227                         atomic_read(&osb->vol_state), osb->osb_flags);
 228
 229         out += scnprintf(buf + out, len - out,
 230                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 231                         osb->sb->s_blocksize, osb->s_clustersize);
 232
 233         out += scnprintf(buf + out, len - out,
 234                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 235                         "ROcompat: 0x%X\n",
 236                         "Features", osb->s_feature_compat,
 237                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 238
 239         out += scnprintf(buf + out, len - out,
 240                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 241                         osb->s_mount_opt, osb->s_atime_quantum);
 242
 243         if (cconn) {
 244                 out += scnprintf(buf + out, len - out,
 245                                 "%10s => Stack: %s  Name: %*s  "
 246                                 "Version: %d.%d\n", "Cluster",
 247                                 (*osb->osb_cluster_stack == '\0' ?
 248                                  "o2cb" : osb->osb_cluster_stack),
 249                                 cconn->cc_namelen, cconn->cc_name,
 250                                 cconn->cc_version.pv_major,
 251                                 cconn->cc_version.pv_minor);
 252         }
 253
 254         spin_lock_irqsave(&osb->dc_task_lock, flags);
 255         out += scnprintf(buf + out, len - out,
 256                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 257                         "WorkSeq: %lu\n", "DownCnvt",
 258                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 259                         osb->blocked_lock_count, osb->dc_wake_sequence,
 260                         osb->dc_work_sequence);
 261         spin_unlock_irqrestore(&osb->dc_task_lock, flags);
 262
 263         spin_lock(&osb->osb_lock);
 264         out += scnprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 265                         "Recovery",
 266                         (osb->recovery_thread_task ?
 267                          task_pid_nr(osb->recovery_thread_task) : -1));
 268         if (rm->rm_used == 0)
 269                 out += scnprintf(buf + out, len - out, " None\n");
 270         else {
 271                 for (i = 0; i < rm->rm_used; i++)
 272                         out += scnprintf(buf + out, len - out, " %d",
 273                                         rm->rm_entries[i]);
 274                 out += scnprintf(buf + out, len - out, "\n");
 275         }
 276         spin_unlock(&osb->osb_lock);
 277
 278         out += scnprintf(buf + out, len - out,
 279                         "%10s => Pid: %d  Interval: %lu\n", "Commit",
 280                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 281                         osb->osb_commit_interval);
 282
 283         out += scnprintf(buf + out, len - out,
 284                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 285                         "Journal", osb->journal->j_state,
 286                         osb->journal->j_trans_id,
 287                         atomic_read(&osb->journal->j_num_trans));
 288
 289         out += scnprintf(buf + out, len - out,
 290                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 291                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 292                         "Stats",
 293                         atomic_read(&osb->alloc_stats.bitmap_data),
 294                         atomic_read(&osb->alloc_stats.local_data),
 295                         atomic_read(&osb->alloc_stats.bg_allocs),
 296                         atomic_read(&osb->alloc_stats.moves),
 297                         atomic_read(&osb->alloc_stats.bg_extends));
 298
 299         out += scnprintf(buf + out, len - out,
 300                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 301                         "Default: %u bits\n",
 302                         "LocalAlloc", osb->local_alloc_state,
 303                         (unsigned long long)osb->la_last_gd,
 304                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 305
 306         spin_lock(&osb->osb_lock);
 307         out += scnprintf(buf + out, len - out,
 308                         "%10s => InodeSlot: %d  StolenInodes: %d, "
 309                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
 310                         osb->s_inode_steal_slot,
 311                         atomic_read(&osb->s_num_inodes_stolen),
 312                         osb->s_meta_steal_slot,
 313                         atomic_read(&osb->s_num_meta_stolen));
 314         spin_unlock(&osb->osb_lock);
 315
 316         out += scnprintf(buf + out, len - out, "OrphanScan => ");
 317         out += scnprintf(buf + out, len - out, "Local: %u  Global: %u ",
 318                         os->os_count, os->os_seqno);
 319         out += scnprintf(buf + out, len - out, " Last Scan: ");
 320         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 321                 out += scnprintf(buf + out, len - out, "Disabled\n");
 322         else
 323                 out += scnprintf(buf + out, len - out, "%lu seconds ago\n",
 324                                 (unsigned long)(ktime_get_seconds() - os->os_scantime));
 325
 326         out += scnprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 327                         "Slots", "Num", "RecoGen");
 328         for (i = 0; i < osb->max_slots; ++i) {
 329                 out += scnprintf(buf + out, len - out,
 330                                 "%10s  %c %3d  %10d\n",
 331                                 " ",
 332                                 (i == osb->slot_num ? '*' : ' '),
 333                                 i, osb->slot_recovery_generations[i]);
 334         }
 335
 336         return out;
 337 }
 338
 339 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 340 {
 341         struct ocfs2_super *osb = inode->i_private;
 342         char *buf = NULL;
 343
 344         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 345         if (!buf)
 346                 goto bail;
 347
 348         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 349
 350         file->private_data = buf;
 351
 352         return 0;
 353 bail:
 354         return -ENOMEM;
 355 }
 356
 357 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 358 {
 359         kfree(file->private_data);
 360         return 0;
 361 }
 362
 363 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 364                                 size_t nbytes, loff_t *ppos)
 365 {
 366         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 367                                        i_size_read(file->f_mapping->host));
 368 }
 369 #else
 370 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 371 {
 372         return 0;
 373 }
 374 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 375 {
 376         return 0;
 377 }
 378 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 379                                 size_t nbytes, loff_t *ppos)
 380 {
 381         return 0;
 382 }
 383 #endif  /* CONFIG_DEBUG_FS */
 384
 385 static const struct file_operations ocfs2_osb_debug_fops = {
 386         .open =         ocfs2_osb_debug_open,
 387         .release =      ocfs2_debug_release,
 388         .read =         ocfs2_debug_read,
 389         .llseek =       generic_file_llseek,
 390 };
 391
 392 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 393 {
 394         int status;
 395         tid_t target;
 396         struct ocfs2_super *osb = OCFS2_SB(sb);
 397
 398         if (ocfs2_is_hard_readonly(osb))
 399                 return -EROFS;
 400
 401         if (wait) {
 402                 status = ocfs2_flush_truncate_log(osb);
 403                 if (status < 0)
 404                         mlog_errno(status);
 405         } else {
 406                 ocfs2_schedule_truncate_log_flush(osb, 0);
 407         }
 408
 409         if (jbd2_journal_start_commit(osb->journal->j_journal,
 410                                       &target)) {
 411                 if (wait)
 412                         jbd2_log_wait_commit(osb->journal->j_journal,
 413                                              target);
 414         }
 415         return 0;
 416 }
 417
 418 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 419 {
 420         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 421             && (ino == USER_QUOTA_SYSTEM_INODE
 422                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 423                 return 0;
 424         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 425             && (ino == GROUP_QUOTA_SYSTEM_INODE
 426                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 427                 return 0;
 428         return 1;
 429 }
 430
 431 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 432 {
 433         struct inode *new = NULL;
 434         int status = 0;
 435         int i;
 436
 437         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 438         if (IS_ERR(new)) {
 439                 status = PTR_ERR(new);
 440                 mlog_errno(status);
 441                 goto bail;
 442         }
 443         osb->root_inode = new;
 444
 445         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 446         if (IS_ERR(new)) {
 447                 status = PTR_ERR(new);
 448                 mlog_errno(status);
 449                 goto bail;
 450         }
 451         osb->sys_root_inode = new;
 452
 453         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 454              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 455                 if (!ocfs2_need_system_inode(osb, i))
 456                         continue;
 457                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 458                 if (!new) {
 459                         ocfs2_release_system_inodes(osb);
 460                         status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
 461                         mlog_errno(status);
 462                         mlog(ML_ERROR, "Unable to load system inode %d, "
 463                              "possibly corrupt fs?", i);
 464                         goto bail;
 465                 }
 466                 // the array now has one ref, so drop this one
 467                 iput(new);
 468         }
 469
 470 bail:
 471         if (status)
 472                 mlog_errno(status);
 473         return status;
 474 }
 475
 476 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 477 {
 478         struct inode *new = NULL;
 479         int status = 0;
 480         int i;
 481
 482         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 483              i < NUM_SYSTEM_INODES;
 484              i++) {
 485                 if (!ocfs2_need_system_inode(osb, i))
 486                         continue;
 487                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 488                 if (!new) {
 489                         ocfs2_release_system_inodes(osb);
 490                         status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
 491                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 492                              status, i, osb->slot_num);
 493                         goto bail;
 494                 }
 495                 /* the array now has one ref, so drop this one */
 496                 iput(new);
 497         }
 498
 499 bail:
 500         if (status)
 501                 mlog_errno(status);
 502         return status;
 503 }
 504
 505 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 506 {
 507         int i;
 508         struct inode *inode;
 509
 510         for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
 511                 inode = osb->global_system_inodes[i];
 512                 if (inode) {
 513                         iput(inode);
 514                         osb->global_system_inodes[i] = NULL;
 515                 }
 516         }
 517
 518         inode = osb->sys_root_inode;
 519         if (inode) {
 520                 iput(inode);
 521                 osb->sys_root_inode = NULL;
 522         }
 523
 524         inode = osb->root_inode;
 525         if (inode) {
 526                 iput(inode);
 527                 osb->root_inode = NULL;
 528         }
 529
 530         if (!osb->local_system_inodes)
 531                 return;
 532
 533         for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
 534                 if (osb->local_system_inodes[i]) {
 535                         iput(osb->local_system_inodes[i]);
 536                         osb->local_system_inodes[i] = NULL;
 537                 }
 538         }
 539
 540         kfree(osb->local_system_inodes);
 541         osb->local_system_inodes = NULL;
 542 }
 543
 544 /* We're allocating fs objects, use GFP_NOFS */
 545 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 546 {
 547         struct ocfs2_inode_info *oi;
 548
 549         oi = alloc_inode_sb(sb, ocfs2_inode_cachep, GFP_NOFS);
 550         if (!oi)
 551                 return NULL;
 552
 553         oi->i_sync_tid = 0;
 554         oi->i_datasync_tid = 0;
 555         memset(&oi->i_dquot, 0, sizeof(oi->i_dquot));
 556
 557         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 558         return &oi->vfs_inode;
 559 }
 560
 561 static void ocfs2_free_inode(struct inode *inode)
 562 {
 563         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 564 }
 565
 566 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 567                                                 unsigned int cbits)
 568 {
 569         unsigned int bytes = 1 << cbits;
 570         unsigned int trim = bytes;
 571         unsigned int bitshift = 32;
 572
 573         /*
 574          * i_size and all block offsets in ocfs2 are always 64 bits
 575          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 576          * 64 bit platforms, cluster size will be the limiting factor.
 577          */
 578
 579 #if BITS_PER_LONG == 32
 580         BUILD_BUG_ON(sizeof(sector_t) != 8);
 581         /*
 582          * We might be limited by page cache size.
 583          */
 584         if (bytes > PAGE_SIZE) {
 585                 bytes = PAGE_SIZE;
 586                 trim = 1;
 587                 /*
 588                  * Shift by 31 here so that we don't get larger than
 589                  * MAX_LFS_FILESIZE
 590                  */
 591                 bitshift = 31;
 592         }
 593 #endif
 594
 595         /*
 596          * Trim by a whole cluster when we can actually approach the
 597          * on-disk limits. Otherwise we can overflow i_clusters when
 598          * an extent start is at the max offset.
 599          */
 600         return (((unsigned long long)bytes) << bitshift) - trim;
 601 }
 602
 603 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 604 {
 605         int incompat_features;
 606         int ret = 0;
 607         struct mount_options parsed_options;
 608         struct ocfs2_super *osb = OCFS2_SB(sb);
 609         u32 tmp;
 610
 611         sync_filesystem(sb);
 612
 613         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
 614             !ocfs2_check_set_options(sb, &parsed_options)) {
 615                 ret = -EINVAL;
 616                 goto out;
 617         }
 618
 619         tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
 620                 OCFS2_MOUNT_HB_NONE;
 621         if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
 622                 ret = -EINVAL;
 623                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 624                 goto out;
 625         }
 626
 627         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 628             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 629                 ret = -EINVAL;
 630                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 631                 goto out;
 632         }
 633
 634         /* Probably don't want this on remount; it might
 635          * mess with other nodes */
 636         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 637             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 638                 ret = -EINVAL;
 639                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 640                 goto out;
 641         }
 642
 643         /* We're going to/from readonly mode. */
 644         if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
 645                 /* Disable quota accounting before remounting RO */
 646                 if (*flags & SB_RDONLY) {
 647                         ret = ocfs2_susp_quotas(osb, 0);
 648                         if (ret < 0)
 649                                 goto out;
 650                 }
 651                 /* Lock here so the check of HARD_RO and the potential
 652                  * setting of SOFT_RO is atomic. */
 653                 spin_lock(&osb->osb_lock);
 654                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 655                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 656                         ret = -EROFS;
 657                         goto unlock_osb;
 658                 }
 659
 660                 if (*flags & SB_RDONLY) {
 661                         sb->s_flags |= SB_RDONLY;
 662                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 663                 } else {
 664                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 665                                 mlog(ML_ERROR, "Cannot remount RDWR "
 666                                      "filesystem due to previous errors.\n");
 667                                 ret = -EROFS;
 668                                 goto unlock_osb;
 669                         }
 670                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 671                         if (incompat_features) {
 672                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 673                                      "of unsupported optional features "
 674                                      "(%x).\n", incompat_features);
 675                                 ret = -EINVAL;
 676                                 goto unlock_osb;
 677                         }
 678                         sb->s_flags &= ~SB_RDONLY;
 679                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 680                 }
 681                 trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
 682 unlock_osb:
 683                 spin_unlock(&osb->osb_lock);
 684                 /* Enable quota accounting after remounting RW */
 685                 if (!ret && !(*flags & SB_RDONLY)) {
 686                         if (sb_any_quota_suspended(sb))
 687                                 ret = ocfs2_susp_quotas(osb, 1);
 688                         else
 689                                 ret = ocfs2_enable_quotas(osb);
 690                         if (ret < 0) {
 691                                 /* Return back changes... */
 692                                 spin_lock(&osb->osb_lock);
 693                                 sb->s_flags |= SB_RDONLY;
 694                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 695                                 spin_unlock(&osb->osb_lock);
 696                                 goto out;
 697                         }
 698                 }
 699         }
 700
 701         if (!ret) {
 702                 /* Only save off the new mount options in case of a successful
 703                  * remount. */
 704                 osb->s_mount_opt = parsed_options.mount_opt;
 705                 osb->s_atime_quantum = parsed_options.atime_quantum;
 706                 osb->preferred_slot = parsed_options.slot;
 707                 if (parsed_options.commit_interval)
 708                         osb->osb_commit_interval = parsed_options.commit_interval;
 709
 710                 if (!ocfs2_is_hard_readonly(osb))
 711                         ocfs2_set_journal_params(osb);
 712
 713                 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
 714                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
 715                                                         SB_POSIXACL : 0);
 716         }
 717 out:
 718         return ret;
 719 }
 720
 721 static int ocfs2_sb_probe(struct super_block *sb,
 722                           struct buffer_head **bh,
 723                           int *sector_size,
 724                           struct ocfs2_blockcheck_stats *stats)
 725 {
 726         int status, tmpstat;
 727         struct ocfs1_vol_disk_hdr *hdr;
 728         struct ocfs2_dinode *di;
 729         int blksize;
 730
 731         *bh = NULL;
 732
 733         /* may be > 512 */
 734         *sector_size = bdev_logical_block_size(sb->s_bdev);
 735         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 736                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 737                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 738                 status = -EINVAL;
 739                 goto bail;
 740         }
 741
 742         /* Can this really happen? */
 743         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 744                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 745
 746         /* check block zero for old format */
 747         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 748         if (status < 0) {
 749                 mlog_errno(status);
 750                 goto bail;
 751         }
 752         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 753         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 754                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 755                      hdr->major_version, hdr->minor_version);
 756                 status = -EINVAL;
 757         }
 758         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 759                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 760                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 761                      hdr->signature);
 762                 status = -EINVAL;
 763         }
 764         brelse(*bh);
 765         *bh = NULL;
 766         if (status < 0) {
 767                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 768                      "upgraded before mounting with ocfs v2\n");
 769                 goto bail;
 770         }
 771
 772         /*
 773          * Now check at magic offset for 512, 1024, 2048, 4096
 774          * blocksizes.  4096 is the maximum blocksize because it is
 775          * the minimum clustersize.
 776          */
 777         status = -EINVAL;
 778         for (blksize = *sector_size;
 779              blksize <= OCFS2_MAX_BLOCKSIZE;
 780              blksize <<= 1) {
 781                 tmpstat = ocfs2_get_sector(sb, bh,
 782                                            OCFS2_SUPER_BLOCK_BLKNO,
 783                                            blksize);
 784                 if (tmpstat < 0) {
 785                         status = tmpstat;
 786                         mlog_errno(status);
 787                         break;
 788                 }
 789                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 790                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 791                 spin_lock_init(&stats->b_lock);
 792                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 793                 if (tmpstat < 0) {
 794                         brelse(*bh);
 795                         *bh = NULL;
 796                 }
 797                 if (tmpstat != -EAGAIN) {
 798                         status = tmpstat;
 799                         break;
 800                 }
 801         }
 802
 803 bail:
 804         return status;
 805 }
 806
 807 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 808 {
 809         u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
 810
 811         if (osb->s_mount_opt & hb_enabled) {
 812                 if (ocfs2_mount_local(osb)) {
 813                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 814                              "mounted device.\n");
 815                         return -EINVAL;
 816                 }
 817                 if (ocfs2_userspace_stack(osb)) {
 818                         mlog(ML_ERROR, "Userspace stack expected, but "
 819                              "o2cb heartbeat arguments passed to mount\n");
 820                         return -EINVAL;
 821                 }
 822                 if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
 823                      !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
 824                     ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
 825                      ocfs2_cluster_o2cb_global_heartbeat(osb))) {
 826                         mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
 827                         return -EINVAL;
 828                 }
 829         }
 830
 831         if (!(osb->s_mount_opt & hb_enabled)) {
 832                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 833                     !ocfs2_userspace_stack(osb)) {
 834                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 835                              "a read-write clustered device.\n");
 836                         return -EINVAL;
 837                 }
 838         }
 839
 840         return 0;
 841 }
 842
 843 /*
 844  * If we're using a userspace stack, mount should have passed
 845  * a name that matches the disk.  If not, mount should not
 846  * have passed a stack.
 847  */
 848 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 849                                         struct mount_options *mopt)
 850 {
 851         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 852                 mlog(ML_ERROR,
 853                      "cluster stack passed to mount, but this filesystem "
 854                      "does not support it\n");
 855                 return -EINVAL;
 856         }
 857
 858         if (ocfs2_userspace_stack(osb) &&
 859             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 860                     OCFS2_STACK_LABEL_LEN)) {
 861                 mlog(ML_ERROR,
 862                      "cluster stack passed to mount (\"%s\") does not "
 863                      "match the filesystem (\"%s\")\n",
 864                      mopt->cluster_stack,
 865                      osb->osb_cluster_stack);
 866                 return -EINVAL;
 867         }
 868
 869         return 0;
 870 }
 871
 872 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 873 {
 874         int type;
 875         struct super_block *sb = osb->sb;
 876         unsigned int feature[OCFS2_MAXQUOTAS] = {
 877                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 878                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 879         int status = 0;
 880
 881         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
 882                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 883                         continue;
 884                 if (unsuspend)
 885                         status = dquot_resume(sb, type);
 886                 else {
 887                         struct ocfs2_mem_dqinfo *oinfo;
 888
 889                         /* Cancel periodic syncing before suspending */
 890                         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 891                         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 892                         status = dquot_suspend(sb, type);
 893                 }
 894                 if (status < 0)
 895                         break;
 896         }
 897         if (status < 0)
 898                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 899                      "remount (error = %d).\n", status);
 900         return status;
 901 }
 902
 903 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 904 {
 905         struct inode *inode[OCFS2_MAXQUOTAS] = { NULL, NULL };
 906         struct super_block *sb = osb->sb;
 907         unsigned int feature[OCFS2_MAXQUOTAS] = {
 908                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 909                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 910         unsigned int ino[OCFS2_MAXQUOTAS] = {
 911                                         LOCAL_USER_QUOTA_SYSTEM_INODE,
 912                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 913         int status;
 914         int type;
 915
 916         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 917         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
 918                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 919                         continue;
 920                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 921                                                         osb->slot_num);
 922                 if (!inode[type]) {
 923                         status = -ENOENT;
 924                         goto out_quota_off;
 925                 }
 926                 status = dquot_load_quota_inode(inode[type], type, QFMT_OCFS2,
 927                                                 DQUOT_USAGE_ENABLED);
 928                 if (status < 0)
 929                         goto out_quota_off;
 930         }
 931
 932         for (type = 0; type < OCFS2_MAXQUOTAS; type++)
 933                 iput(inode[type]);
 934         return 0;
 935 out_quota_off:
 936         ocfs2_disable_quotas(osb);
 937         for (type = 0; type < OCFS2_MAXQUOTAS; type++)
 938                 iput(inode[type]);
 939         mlog_errno(status);
 940         return status;
 941 }
 942
 943 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 944 {
 945         int type;
 946         struct inode *inode;
 947         struct super_block *sb = osb->sb;
 948         struct ocfs2_mem_dqinfo *oinfo;
 949
 950         /* We mostly ignore errors in this function because there's not much
 951          * we can do when we see them */
 952         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
 953                 if (!sb_has_quota_loaded(sb, type))
 954                         continue;
 955                 oinfo = sb_dqinfo(sb, type)->dqi_priv;
 956                 cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 957                 inode = igrab(sb->s_dquot.files[type]);
 958                 /* Turn off quotas. This will remove all dquot structures from
 959                  * memory and so they will be automatically synced to global
 960                  * quota files */
 961                 dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
 962                                         DQUOT_LIMITS_ENABLED);
 963                 iput(inode);
 964         }
 965 }
 966
 967 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 968 {
 969         struct dentry *root;
 970         int status, sector_size;
 971         struct mount_options parsed_options;
 972         struct inode *inode = NULL;
 973         struct ocfs2_super *osb = NULL;
 974         struct buffer_head *bh = NULL;
 975         char nodestr[12];
 976         struct ocfs2_blockcheck_stats stats;
 977
 978         trace_ocfs2_fill_super(sb, data, silent);
 979
 980         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 981                 status = -EINVAL;
 982                 goto out;
 983         }
 984
 985         /* probe for superblock */
 986         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
 987         if (status < 0) {
 988                 mlog(ML_ERROR, "superblock probe failed!\n");
 989                 goto out;
 990         }
 991
 992         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
 993         brelse(bh);
 994         bh = NULL;
 995         if (status < 0)
 996                 goto out;
 997
 998         osb = OCFS2_SB(sb);
 999
1000         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1001                 status = -EINVAL;
1002                 goto out_super;
1003         }
1004         osb->s_mount_opt = parsed_options.mount_opt;
1005         osb->s_atime_quantum = parsed_options.atime_quantum;
1006         osb->preferred_slot = parsed_options.slot;
1007         osb->osb_commit_interval = parsed_options.commit_interval;
1008
1009         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1010         osb->osb_resv_level = parsed_options.resv_level;
1011         osb->osb_dir_resv_level = parsed_options.resv_level;
1012         if (parsed_options.dir_resv_level == -1)
1013                 osb->osb_dir_resv_level = parsed_options.resv_level;
1014         else
1015                 osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1016
1017         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1018         if (status)
1019                 goto out_super;
1020
1021         sb->s_magic = OCFS2_SUPER_MAGIC;
1022
1023         sb->s_flags = (sb->s_flags & ~(SB_POSIXACL | SB_NOSEC)) |
1024                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
1025
1026         /* Hard readonly mode only if: bdev_read_only, SB_RDONLY,
1027          * heartbeat=none */
1028         if (bdev_read_only(sb->s_bdev)) {
1029                 if (!sb_rdonly(sb)) {
1030                         status = -EACCES;
1031                         mlog(ML_ERROR, "Readonly device detected but readonly "
1032                              "mount was not specified.\n");
1033                         goto out_super;
1034                 }
1035
1036                 /* You should not be able to start a local heartbeat
1037                  * on a readonly device. */
1038                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1039                         status = -EROFS;
1040                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1041                              "device.\n");
1042                         goto out_super;
1043                 }
1044
1045                 status = ocfs2_check_journals_nolocks(osb);
1046                 if (status < 0) {
1047                         if (status == -EROFS)
1048                                 mlog(ML_ERROR, "Recovery required on readonly "
1049                                      "file system, but write access is "
1050                                      "unavailable.\n");
1051                         goto out_super;
1052                 }
1053
1054                 ocfs2_set_ro_flag(osb, 1);
1055
1056                 printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1057                        "Cluster services will not be used for this mount. "
1058                        "Recovery will be skipped.\n", osb->dev_str);
1059         }
1060
1061         if (!ocfs2_is_hard_readonly(osb)) {
1062                 if (sb_rdonly(sb))
1063                         ocfs2_set_ro_flag(osb, 0);
1064         }
1065
1066         status = ocfs2_verify_heartbeat(osb);
1067         if (status < 0)
1068                 goto out_super;
1069
1070         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1071                                                  ocfs2_debugfs_root);
1072
1073         debugfs_create_file("fs_state", S_IFREG|S_IRUSR, osb->osb_debug_root,
1074                             osb, &ocfs2_osb_debug_fops);
1075
1076         if (ocfs2_meta_ecc(osb))
1077                 ocfs2_blockcheck_stats_debugfs_install( &osb->osb_ecc_stats,
1078                                                         osb->osb_debug_root);
1079
1080         status = ocfs2_mount_volume(sb);
1081         if (status < 0)
1082                 goto out_debugfs;
1083
1084         if (osb->root_inode)
1085                 inode = igrab(osb->root_inode);
1086
1087         if (!inode) {
1088                 status = -EIO;
1089                 goto out_dismount;
1090         }
1091
1092         osb->osb_dev_kset = kset_create_and_add(sb->s_id, NULL,
1093                                                 &ocfs2_kset->kobj);
1094         if (!osb->osb_dev_kset) {
1095                 status = -ENOMEM;
1096                 mlog(ML_ERROR, "Unable to create device kset %s.\n", sb->s_id);
1097                 goto out_dismount;
1098         }
1099
1100         /* Create filecheck sysfs related directories/files at
1101          * /sys/fs/ocfs2/<devname>/filecheck */
1102         if (ocfs2_filecheck_create_sysfs(osb)) {
1103                 status = -ENOMEM;
1104                 mlog(ML_ERROR, "Unable to create filecheck sysfs directory at "
1105                         "/sys/fs/ocfs2/%s/filecheck.\n", sb->s_id);
1106                 goto out_dismount;
1107         }
1108
1109         root = d_make_root(inode);
1110         if (!root) {
1111                 status = -ENOMEM;
1112                 goto out_dismount;
1113         }
1114
1115         sb->s_root = root;
1116
1117         ocfs2_complete_mount_recovery(osb);
1118
1119         if (ocfs2_mount_local(osb))
1120                 snprintf(nodestr, sizeof(nodestr), "local");
1121         else
1122                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1123
1124         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1125                "with %s data mode.\n",
1126                osb->dev_str, nodestr, osb->slot_num,
1127                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1128                "ordered");
1129
1130         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1131         wake_up(&osb->osb_mount_event);
1132
1133         /* Now we can initialize quotas because we can afford to wait
1134          * for cluster locks recovery now. That also means that truncation
1135          * log recovery can happen but that waits for proper quota setup */
1136         if (!sb_rdonly(sb)) {
1137                 status = ocfs2_enable_quotas(osb);
1138                 if (status < 0) {
1139                         /* We have to err-out specially here because
1140                          * s_root is already set */
1141                         mlog_errno(status);
1142                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1143                         wake_up(&osb->osb_mount_event);
1144                         return status;
1145                 }
1146         }
1147
1148         ocfs2_complete_quota_recovery(osb);
1149
1150         /* Now we wake up again for processes waiting for quotas */
1151         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1152         wake_up(&osb->osb_mount_event);
1153
1154         /* Start this when the mount is almost sure of being successful */
1155         ocfs2_orphan_scan_start(osb);
1156
1157         return status;
1158
1159 out_dismount:
1160         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1161         wake_up(&osb->osb_mount_event);
1162         ocfs2_dismount_volume(sb, 1);
1163         goto out;
1164
1165 out_debugfs:
1166         debugfs_remove_recursive(osb->osb_debug_root);
1167 out_super:
1168         ocfs2_release_system_inodes(osb);
1169         kfree(osb->recovery_map);
1170         ocfs2_delete_osb(osb);
1171         kfree(osb);
1172 out:
1173         mlog_errno(status);
1174
1175         return status;
1176 }
1177
1178 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1179                         int flags,
1180                         const char *dev_name,
1181                         void *data)
1182 {
1183         return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1184 }
1185
1186 static struct file_system_type ocfs2_fs_type = {
1187         .owner          = THIS_MODULE,
1188         .name           = "ocfs2",
1189         .mount          = ocfs2_mount,
1190         .kill_sb        = kill_block_super,
1191         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1192         .next           = NULL
1193 };
1194 MODULE_ALIAS_FS("ocfs2");
1195
1196 static int ocfs2_check_set_options(struct super_block *sb,
1197                                    struct mount_options *options)
1198 {
1199         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1200             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1201                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1202                 mlog(ML_ERROR, "User quotas were requested, but this "
1203                      "filesystem does not have the feature enabled.\n");
1204                 return 0;
1205         }
1206         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1207             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1208                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1209                 mlog(ML_ERROR, "Group quotas were requested, but this "
1210                      "filesystem does not have the feature enabled.\n");
1211                 return 0;
1212         }
1213         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1214             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1215                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1216                      "feature is not enabled\n");
1217                 return 0;
1218         }
1219         /* No ACL setting specified? Use XATTR feature... */
1220         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1221                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1222                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1223                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1224                 else
1225                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1226         }
1227         return 1;
1228 }
1229
1230 static int ocfs2_parse_options(struct super_block *sb,
1231                                char *options,
1232                                struct mount_options *mopt,
1233                                int is_remount)
1234 {
1235         int status, user_stack = 0;
1236         char *p;
1237         u32 tmp;
1238         int token, option;
1239         substring_t args[MAX_OPT_ARGS];
1240
1241         trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1242
1243         mopt->commit_interval = 0;
1244         mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1245         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1246         mopt->slot = OCFS2_INVALID_SLOT;
1247         mopt->localalloc_opt = -1;
1248         mopt->cluster_stack[0] = '\0';
1249         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1250         mopt->dir_resv_level = -1;
1251
1252         if (!options) {
1253                 status = 1;
1254                 goto bail;
1255         }
1256
1257         while ((p = strsep(&options, ",")) != NULL) {
1258                 if (!*p)
1259                         continue;
1260
1261                 token = match_token(p, tokens, args);
1262                 switch (token) {
1263                 case Opt_hb_local:
1264                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1265                         break;
1266                 case Opt_hb_none:
1267                         mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1268                         break;
1269                 case Opt_hb_global:
1270                         mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1271                         break;
1272                 case Opt_barrier:
1273                         if (match_int(&args[0], &option)) {
1274                                 status = 0;
1275                                 goto bail;
1276                         }
1277                         if (option)
1278                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1279                         else
1280                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1281                         break;
1282                 case Opt_intr:
1283                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1284                         break;
1285                 case Opt_nointr:
1286                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1287                         break;
1288                 case Opt_err_panic:
1289                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1290                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1291                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1292                         break;
1293                 case Opt_err_ro:
1294                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1295                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1296                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_ROFS;
1297                         break;
1298                 case Opt_err_cont:
1299                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1300                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1301                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_CONT;
1302                         break;
1303                 case Opt_data_ordered:
1304                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1305                         break;
1306                 case Opt_data_writeback:
1307                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1308                         break;
1309                 case Opt_user_xattr:
1310                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1311                         break;
1312                 case Opt_nouser_xattr:
1313                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1314                         break;
1315                 case Opt_atime_quantum:
1316                         if (match_int(&args[0], &option)) {
1317                                 status = 0;
1318                                 goto bail;
1319                         }
1320                         if (option >= 0)
1321                                 mopt->atime_quantum = option;
1322                         break;
1323                 case Opt_slot:
1324                         if (match_int(&args[0], &option)) {
1325                                 status = 0;
1326                                 goto bail;
1327                         }
1328                         if (option)
1329                                 mopt->slot = (u16)option;
1330                         break;
1331                 case Opt_commit:
1332                         if (match_int(&args[0], &option)) {
1333                                 status = 0;
1334                                 goto bail;
1335                         }
1336                         if (option < 0)
1337                                 return 0;
1338                         if (option == 0)
1339                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1340                         mopt->commit_interval = HZ * option;
1341                         break;
1342                 case Opt_localalloc:
1343                         if (match_int(&args[0], &option)) {
1344                                 status = 0;
1345                                 goto bail;
1346                         }
1347                         if (option >= 0)
1348                                 mopt->localalloc_opt = option;
1349                         break;
1350                 case Opt_localflocks:
1351                         /*
1352                          * Changing this during remount could race
1353                          * flock() requests, or "unbalance" existing
1354                          * ones (e.g., a lock is taken in one mode but
1355                          * dropped in the other). If users care enough
1356                          * to flip locking modes during remount, we
1357                          * could add a "local" flag to individual
1358                          * flock structures for proper tracking of
1359                          * state.
1360                          */
1361                         if (!is_remount)
1362                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1363                         break;
1364                 case Opt_stack:
1365                         /* Check both that the option we were passed
1366                          * is of the right length and that it is a proper
1367                          * string of the right length.
1368                          */
1369                         if (((args[0].to - args[0].from) !=
1370                              OCFS2_STACK_LABEL_LEN) ||
1371                             (strnlen(args[0].from,
1372                                      OCFS2_STACK_LABEL_LEN) !=
1373                              OCFS2_STACK_LABEL_LEN)) {
1374                                 mlog(ML_ERROR,
1375                                      "Invalid cluster_stack option\n");
1376                                 status = 0;
1377                                 goto bail;
1378                         }
1379                         memcpy(mopt->cluster_stack, args[0].from,
1380                                OCFS2_STACK_LABEL_LEN);
1381                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1382                         /*
1383                          * Open code the memcmp here as we don't have
1384                          * an osb to pass to
1385                          * ocfs2_userspace_stack().
1386                          */
1387                         if (memcmp(mopt->cluster_stack,
1388                                    OCFS2_CLASSIC_CLUSTER_STACK,
1389                                    OCFS2_STACK_LABEL_LEN))
1390                                 user_stack = 1;
1391                         break;
1392                 case Opt_inode64:
1393                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1394                         break;
1395                 case Opt_usrquota:
1396                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1397                         break;
1398                 case Opt_grpquota:
1399                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1400                         break;
1401                 case Opt_coherency_buffered:
1402                         mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1403                         break;
1404                 case Opt_coherency_full:
1405                         mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1406                         break;
1407                 case Opt_acl:
1408                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1409                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1410                         break;
1411                 case Opt_noacl:
1412                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1413                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1414                         break;
1415                 case Opt_resv_level:
1416                         if (is_remount)
1417                                 break;
1418                         if (match_int(&args[0], &option)) {
1419                                 status = 0;
1420                                 goto bail;
1421                         }
1422                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1423                             option < OCFS2_MAX_RESV_LEVEL)
1424                                 mopt->resv_level = option;
1425                         break;
1426                 case Opt_dir_resv_level:
1427                         if (is_remount)
1428                                 break;
1429                         if (match_int(&args[0], &option)) {
1430                                 status = 0;
1431                                 goto bail;
1432                         }
1433                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1434                             option < OCFS2_MAX_RESV_LEVEL)
1435                                 mopt->dir_resv_level = option;
1436                         break;
1437                 case Opt_journal_async_commit:
1438                         mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;
1439                         break;
1440                 default:
1441                         mlog(ML_ERROR,
1442                              "Unrecognized mount option \"%s\" "
1443                              "or missing value\n", p);
1444                         status = 0;
1445                         goto bail;
1446                 }
1447         }
1448
1449         if (user_stack == 0) {
1450                 /* Ensure only one heartbeat mode */
1451                 tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1452                                          OCFS2_MOUNT_HB_GLOBAL |
1453                                          OCFS2_MOUNT_HB_NONE);
1454                 if (hweight32(tmp) != 1) {
1455                         mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1456                         status = 0;
1457                         goto bail;
1458                 }
1459         }
1460
1461         status = 1;
1462
1463 bail:
1464         return status;
1465 }
1466
1467 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1468 {
1469         struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1470         unsigned long opts = osb->s_mount_opt;
1471         unsigned int local_alloc_megs;
1472
1473         if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1474                 seq_printf(s, ",_netdev");
1475                 if (opts & OCFS2_MOUNT_HB_LOCAL)
1476                         seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1477                 else
1478                         seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1479         } else
1480                 seq_printf(s, ",%s", OCFS2_HB_NONE);
1481
1482         if (opts & OCFS2_MOUNT_NOINTR)
1483                 seq_printf(s, ",nointr");
1484
1485         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1486                 seq_printf(s, ",data=writeback");
1487         else
1488                 seq_printf(s, ",data=ordered");
1489
1490         if (opts & OCFS2_MOUNT_BARRIER)
1491                 seq_printf(s, ",barrier=1");
1492
1493         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1494                 seq_printf(s, ",errors=panic");
1495         else if (opts & OCFS2_MOUNT_ERRORS_CONT)
1496                 seq_printf(s, ",errors=continue");
1497         else
1498                 seq_printf(s, ",errors=remount-ro");
1499
1500         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1501                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1502
1503         seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1504
1505         if (osb->osb_commit_interval)
1506                 seq_printf(s, ",commit=%u",
1507                            (unsigned) (osb->osb_commit_interval / HZ));
1508
1509         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1510         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1511                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1512
1513         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1514                 seq_printf(s, ",localflocks,");
1515
1516         if (osb->osb_cluster_stack[0])
1517                 seq_show_option_n(s, "cluster_stack", osb->osb_cluster_stack,
1518                                   OCFS2_STACK_LABEL_LEN);
1519         if (opts & OCFS2_MOUNT_USRQUOTA)
1520                 seq_printf(s, ",usrquota");
1521         if (opts & OCFS2_MOUNT_GRPQUOTA)
1522                 seq_printf(s, ",grpquota");
1523
1524         if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1525                 seq_printf(s, ",coherency=buffered");
1526         else
1527                 seq_printf(s, ",coherency=full");
1528
1529         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1530                 seq_printf(s, ",nouser_xattr");
1531         else
1532                 seq_printf(s, ",user_xattr");
1533
1534         if (opts & OCFS2_MOUNT_INODE64)
1535                 seq_printf(s, ",inode64");
1536
1537         if (opts & OCFS2_MOUNT_POSIX_ACL)
1538                 seq_printf(s, ",acl");
1539         else
1540                 seq_printf(s, ",noacl");
1541
1542         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1543                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1544
1545         if (osb->osb_dir_resv_level != osb->osb_resv_level)
1546                 seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1547
1548         if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
1549                 seq_printf(s, ",journal_async_commit");
1550
1551         return 0;
1552 }
1553
1554 static int __init ocfs2_init(void)
1555 {
1556         int status;
1557
1558         status = init_ocfs2_uptodate_cache();
1559         if (status < 0)
1560                 goto out1;
1561
1562         status = ocfs2_initialize_mem_caches();
1563         if (status < 0)
1564                 goto out2;
1565
1566         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1567
1568         ocfs2_set_locking_protocol();
1569
1570         status = register_quota_format(&ocfs2_quota_format);
1571         if (status < 0)
1572                 goto out3;
1573         status = register_filesystem(&ocfs2_fs_type);
1574         if (!status)
1575                 return 0;
1576
1577         unregister_quota_format(&ocfs2_quota_format);
1578 out3:
1579         debugfs_remove(ocfs2_debugfs_root);
1580         ocfs2_free_mem_caches();
1581 out2:
1582         exit_ocfs2_uptodate_cache();
1583 out1:
1584         mlog_errno(status);
1585         return status;
1586 }
1587
1588 static void __exit ocfs2_exit(void)
1589 {
1590         unregister_quota_format(&ocfs2_quota_format);
1591
1592         debugfs_remove(ocfs2_debugfs_root);
1593
1594         ocfs2_free_mem_caches();
1595
1596         unregister_filesystem(&ocfs2_fs_type);
1597
1598         exit_ocfs2_uptodate_cache();
1599 }
1600
1601 static void ocfs2_put_super(struct super_block *sb)
1602 {
1603         trace_ocfs2_put_super(sb);
1604
1605         ocfs2_sync_blockdev(sb);
1606         ocfs2_dismount_volume(sb, 0);
1607 }
1608
1609 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1610 {
1611         struct ocfs2_super *osb;
1612         u32 numbits, freebits;
1613         int status;
1614         struct ocfs2_dinode *bm_lock;
1615         struct buffer_head *bh = NULL;
1616         struct inode *inode = NULL;
1617
1618         trace_ocfs2_statfs(dentry->d_sb, buf);
1619
1620         osb = OCFS2_SB(dentry->d_sb);
1621
1622         inode = ocfs2_get_system_file_inode(osb,
1623                                             GLOBAL_BITMAP_SYSTEM_INODE,
1624                                             OCFS2_INVALID_SLOT);
1625         if (!inode) {
1626                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1627                 status = -EIO;
1628                 goto bail;
1629         }
1630
1631         status = ocfs2_inode_lock(inode, &bh, 0);
1632         if (status < 0) {
1633                 mlog_errno(status);
1634                 goto bail;
1635         }
1636
1637         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1638
1639         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1640         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1641
1642         buf->f_type = OCFS2_SUPER_MAGIC;
1643         buf->f_bsize = dentry->d_sb->s_blocksize;
1644         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1645         buf->f_blocks = ((sector_t) numbits) *
1646                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1647         buf->f_bfree = ((sector_t) freebits) *
1648                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1649         buf->f_bavail = buf->f_bfree;
1650         buf->f_files = numbits;
1651         buf->f_ffree = freebits;
1652         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1653                                 & 0xFFFFFFFFUL;
1654         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1655                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1656
1657         brelse(bh);
1658
1659         ocfs2_inode_unlock(inode, 0);
1660         status = 0;
1661 bail:
1662         iput(inode);
1663
1664         if (status)
1665                 mlog_errno(status);
1666
1667         return status;
1668 }
1669
1670 static void ocfs2_inode_init_once(void *data)
1671 {
1672         struct ocfs2_inode_info *oi = data;
1673
1674         oi->ip_flags = 0;
1675         oi->ip_open_count = 0;
1676         spin_lock_init(&oi->ip_lock);
1677         ocfs2_extent_map_init(&oi->vfs_inode);
1678         INIT_LIST_HEAD(&oi->ip_io_markers);
1679         INIT_LIST_HEAD(&oi->ip_unwritten_list);
1680         oi->ip_dir_start_lookup = 0;
1681         init_rwsem(&oi->ip_alloc_sem);
1682         init_rwsem(&oi->ip_xattr_sem);
1683         mutex_init(&oi->ip_io_mutex);
1684
1685         oi->ip_blkno = 0ULL;
1686         oi->ip_clusters = 0;
1687         oi->ip_next_orphan = NULL;
1688
1689         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1690
1691         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1692         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1693         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1694
1695         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1696                                   &ocfs2_inode_caching_ops);
1697
1698         inode_init_once(&oi->vfs_inode);
1699 }
1700
1701 static int ocfs2_initialize_mem_caches(void)
1702 {
1703         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1704                                        sizeof(struct ocfs2_inode_info),
1705                                        0,
1706                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1707                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1708                                        ocfs2_inode_init_once);
1709         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1710                                         sizeof(struct ocfs2_dquot),
1711                                         0,
1712                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1713                                                 SLAB_MEM_SPREAD),
1714                                         NULL);
1715         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1716                                         sizeof(struct ocfs2_quota_chunk),
1717                                         0,
1718                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1719                                         NULL);
1720         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1721             !ocfs2_qf_chunk_cachep) {
1722                 kmem_cache_destroy(ocfs2_inode_cachep);
1723                 kmem_cache_destroy(ocfs2_dquot_cachep);
1724                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1725                 return -ENOMEM;
1726         }
1727
1728         return 0;
1729 }
1730
1731 static void ocfs2_free_mem_caches(void)
1732 {
1733         /*
1734          * Make sure all delayed rcu free inodes are flushed before we
1735          * destroy cache.
1736          */
1737         rcu_barrier();
1738         kmem_cache_destroy(ocfs2_inode_cachep);
1739         ocfs2_inode_cachep = NULL;
1740
1741         kmem_cache_destroy(ocfs2_dquot_cachep);
1742         ocfs2_dquot_cachep = NULL;
1743
1744         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1745         ocfs2_qf_chunk_cachep = NULL;
1746 }
1747
1748 static int ocfs2_get_sector(struct super_block *sb,
1749                             struct buffer_head **bh,
1750                             int block,
1751                             int sect_size)
1752 {
1753         if (!sb_set_blocksize(sb, sect_size)) {
1754                 mlog(ML_ERROR, "unable to set blocksize\n");
1755                 return -EIO;
1756         }
1757
1758         *bh = sb_getblk(sb, block);
1759         if (!*bh) {
1760                 mlog_errno(-ENOMEM);
1761                 return -ENOMEM;
1762         }
1763         lock_buffer(*bh);
1764         if (!buffer_dirty(*bh))
1765                 clear_buffer_uptodate(*bh);
1766         unlock_buffer(*bh);
1767         ll_rw_block(REQ_OP_READ, 1, bh);
1768         wait_on_buffer(*bh);
1769         if (!buffer_uptodate(*bh)) {
1770                 mlog_errno(-EIO);
1771                 brelse(*bh);
1772                 *bh = NULL;
1773                 return -EIO;
1774         }
1775
1776         return 0;
1777 }
1778
1779 static int ocfs2_mount_volume(struct super_block *sb)
1780 {
1781         int status = 0;
1782         struct ocfs2_super *osb = OCFS2_SB(sb);
1783
1784         if (ocfs2_is_hard_readonly(osb))
1785                 goto out;
1786
1787         mutex_init(&osb->obs_trim_fs_mutex);
1788
1789         status = ocfs2_dlm_init(osb);
1790         if (status < 0) {
1791                 mlog_errno(status);
1792                 if (status == -EBADR && ocfs2_userspace_stack(osb))
1793                         mlog(ML_ERROR, "couldn't mount because cluster name on"
1794                         " disk does not match the running cluster name.\n");
1795                 goto out;
1796         }
1797
1798         status = ocfs2_super_lock(osb, 1);
1799         if (status < 0) {
1800                 mlog_errno(status);
1801                 goto out_dlm;
1802         }
1803
1804         /* This will load up the node map and add ourselves to it. */
1805         status = ocfs2_find_slot(osb);
1806         if (status < 0) {
1807                 mlog_errno(status);
1808                 goto out_super_lock;
1809         }
1810
1811         /* load all node-local system inodes */
1812         status = ocfs2_init_local_system_inodes(osb);
1813         if (status < 0) {
1814                 mlog_errno(status);
1815                 goto out_super_lock;
1816         }
1817
1818         status = ocfs2_check_volume(osb);
1819         if (status < 0) {
1820                 mlog_errno(status);
1821                 goto out_system_inodes;
1822         }
1823
1824         status = ocfs2_truncate_log_init(osb);
1825         if (status < 0) {
1826                 mlog_errno(status);
1827                 goto out_system_inodes;
1828         }
1829
1830         ocfs2_super_unlock(osb, 1);
1831         return 0;
1832
1833 out_system_inodes:
1834         if (osb->local_alloc_state == OCFS2_LA_ENABLED)
1835                 ocfs2_shutdown_local_alloc(osb);
1836         ocfs2_release_system_inodes(osb);
1837         /* before journal shutdown, we should release slot_info */
1838         ocfs2_free_slot_info(osb);
1839         ocfs2_journal_shutdown(osb);
1840 out_super_lock:
1841         ocfs2_super_unlock(osb, 1);
1842 out_dlm:
1843         ocfs2_dlm_shutdown(osb, 0);
1844 out:
1845         return status;
1846 }
1847
1848 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1849 {
1850         int tmp, hangup_needed = 0;
1851         struct ocfs2_super *osb = NULL;
1852         char nodestr[12];
1853
1854         trace_ocfs2_dismount_volume(sb);
1855
1856         BUG_ON(!sb);
1857         osb = OCFS2_SB(sb);
1858         BUG_ON(!osb);
1859
1860         /* Remove file check sysfs related directores/files,
1861          * and wait for the pending file check operations */
1862         ocfs2_filecheck_remove_sysfs(osb);
1863
1864         kset_unregister(osb->osb_dev_kset);
1865
1866         /* Orphan scan should be stopped as early as possible */
1867         ocfs2_orphan_scan_stop(osb);
1868
1869         ocfs2_disable_quotas(osb);
1870
1871         /* All dquots should be freed by now */
1872         WARN_ON(!llist_empty(&osb->dquot_drop_list));
1873         /* Wait for worker to be done with the work structure in osb */
1874         cancel_work_sync(&osb->dquot_drop_work);
1875
1876         ocfs2_shutdown_local_alloc(osb);
1877
1878         ocfs2_truncate_log_shutdown(osb);
1879
1880         /* This will disable recovery and flush any recovery work. */
1881         ocfs2_recovery_exit(osb);
1882
1883         ocfs2_sync_blockdev(sb);
1884
1885         ocfs2_purge_refcount_trees(osb);
1886
1887         /* No cluster connection means we've failed during mount, so skip
1888          * all the steps which depended on that to complete. */
1889         if (osb->cconn) {
1890                 tmp = ocfs2_super_lock(osb, 1);
1891                 if (tmp < 0) {
1892                         mlog_errno(tmp);
1893                         return;
1894                 }
1895         }
1896
1897         if (osb->slot_num != OCFS2_INVALID_SLOT)
1898                 ocfs2_put_slot(osb);
1899
1900         if (osb->cconn)
1901                 ocfs2_super_unlock(osb, 1);
1902
1903         ocfs2_release_system_inodes(osb);
1904
1905         ocfs2_journal_shutdown(osb);
1906
1907         /*
1908          * If we're dismounting due to mount error, mount.ocfs2 will clean
1909          * up heartbeat.  If we're a local mount, there is no heartbeat.
1910          * If we failed before we got a uuid_str yet, we can't stop
1911          * heartbeat.  Otherwise, do it.
1912          */
1913         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1914             !ocfs2_is_hard_readonly(osb))
1915                 hangup_needed = 1;
1916
1917         ocfs2_dlm_shutdown(osb, hangup_needed);
1918
1919         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1920         debugfs_remove_recursive(osb->osb_debug_root);
1921
1922         if (hangup_needed)
1923                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1924
1925         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1926
1927         if (ocfs2_mount_local(osb))
1928                 snprintf(nodestr, sizeof(nodestr), "local");
1929         else
1930                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1931
1932         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1933                osb->dev_str, nodestr);
1934
1935         ocfs2_delete_osb(osb);
1936         kfree(osb);
1937         sb->s_dev = 0;
1938         sb->s_fs_info = NULL;
1939 }
1940
1941 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1942                                 unsigned uuid_bytes)
1943 {
1944         int i, ret;
1945         char *ptr;
1946
1947         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1948
1949         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1950         if (osb->uuid_str == NULL)
1951                 return -ENOMEM;
1952
1953         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1954                 /* print with null */
1955                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1956                 if (ret != 2) /* drop super cleans up */
1957                         return -EINVAL;
1958                 /* then only advance past the last char */
1959                 ptr += 2;
1960         }
1961
1962         return 0;
1963 }
1964
1965 /* Make sure entire volume is addressable by our journal.  Requires
1966    osb_clusters_at_boot to be valid and for the journal to have been
1967    initialized by ocfs2_journal_init(). */
1968 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
1969 {
1970         int status = 0;
1971         u64 max_block =
1972                 ocfs2_clusters_to_blocks(osb->sb,
1973                                          osb->osb_clusters_at_boot) - 1;
1974
1975         /* 32-bit block number is always OK. */
1976         if (max_block <= (u32)~0ULL)
1977                 goto out;
1978
1979         /* Volume is "huge", so see if our journal is new enough to
1980            support it. */
1981         if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
1982                                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
1983               jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
1984                                                JBD2_FEATURE_INCOMPAT_64BIT))) {
1985                 mlog(ML_ERROR, "The journal cannot address the entire volume. "
1986                      "Enable the 'block64' journal option with tunefs.ocfs2");
1987                 status = -EFBIG;
1988                 goto out;
1989         }
1990
1991  out:
1992         return status;
1993 }
1994
1995 static int ocfs2_initialize_super(struct super_block *sb,
1996                                   struct buffer_head *bh,
1997                                   int sector_size,
1998                                   struct ocfs2_blockcheck_stats *stats)
1999 {
2000         int status;
2001         int i, cbits, bbits;
2002         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2003         struct inode *inode = NULL;
2004         struct ocfs2_super *osb;
2005         u64 total_blocks;
2006
2007         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2008         if (!osb) {
2009                 status = -ENOMEM;
2010                 mlog_errno(status);
2011                 goto out;
2012         }
2013
2014         sb->s_fs_info = osb;
2015         sb->s_op = &ocfs2_sops;
2016         sb->s_d_op = &ocfs2_dentry_ops;
2017         sb->s_export_op = &ocfs2_export_ops;
2018         sb->s_qcop = &dquot_quotactl_sysfile_ops;
2019         sb->dq_op = &ocfs2_quota_operations;
2020         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
2021         sb->s_xattr = ocfs2_xattr_handlers;
2022         sb->s_time_gran = 1;
2023         sb->s_flags |= SB_NOATIME;
2024         /* this is needed to support O_LARGEFILE */
2025         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2026         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2027         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2028         memcpy(&sb->s_uuid, di->id2.i_super.s_uuid,
2029                sizeof(di->id2.i_super.s_uuid));
2030
2031         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2032
2033         for (i = 0; i < 3; i++)
2034                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2035         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2036
2037         osb->sb = sb;
2038         osb->s_sectsize_bits = blksize_bits(sector_size);
2039         BUG_ON(!osb->s_sectsize_bits);
2040
2041         spin_lock_init(&osb->dc_task_lock);
2042         init_waitqueue_head(&osb->dc_event);
2043         osb->dc_work_sequence = 0;
2044         osb->dc_wake_sequence = 0;
2045         INIT_LIST_HEAD(&osb->blocked_lock_list);
2046         osb->blocked_lock_count = 0;
2047         spin_lock_init(&osb->osb_lock);
2048         spin_lock_init(&osb->osb_xattr_lock);
2049         ocfs2_init_steal_slots(osb);
2050
2051         mutex_init(&osb->system_file_mutex);
2052
2053         atomic_set(&osb->alloc_stats.moves, 0);
2054         atomic_set(&osb->alloc_stats.local_data, 0);
2055         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2056         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2057         atomic_set(&osb->alloc_stats.bg_extends, 0);
2058
2059         /* Copy the blockcheck stats from the superblock probe */
2060         osb->osb_ecc_stats = *stats;
2061
2062         ocfs2_init_node_maps(osb);
2063
2064         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2065                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2066
2067         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2068         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2069                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2070                      osb->max_slots);
2071                 status = -EINVAL;
2072                 goto out;
2073         }
2074
2075         ocfs2_orphan_scan_init(osb);
2076
2077         status = ocfs2_recovery_init(osb);
2078         if (status) {
2079                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2080                 mlog_errno(status);
2081                 goto out;
2082         }
2083
2084         init_waitqueue_head(&osb->checkpoint_event);
2085
2086         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2087
2088         osb->slot_num = OCFS2_INVALID_SLOT;
2089
2090         osb->s_xattr_inline_size = le16_to_cpu(
2091                                         di->id2.i_super.s_xattr_inline_size);
2092
2093         osb->local_alloc_state = OCFS2_LA_UNUSED;
2094         osb->local_alloc_bh = NULL;
2095         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2096
2097         init_waitqueue_head(&osb->osb_mount_event);
2098
2099         ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2100
2101         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2102         if (!osb->vol_label) {
2103                 mlog(ML_ERROR, "unable to alloc vol label\n");
2104                 status = -ENOMEM;
2105                 goto out_recovery_map;
2106         }
2107
2108         osb->slot_recovery_generations =
2109                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2110                         GFP_KERNEL);
2111         if (!osb->slot_recovery_generations) {
2112                 status = -ENOMEM;
2113                 mlog_errno(status);
2114                 goto out_vol_label;
2115         }
2116
2117         init_waitqueue_head(&osb->osb_wipe_event);
2118         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2119                                         sizeof(*osb->osb_orphan_wipes),
2120                                         GFP_KERNEL);
2121         if (!osb->osb_orphan_wipes) {
2122                 status = -ENOMEM;
2123                 mlog_errno(status);
2124                 goto out_slot_recovery_gen;
2125         }
2126
2127         osb->osb_rf_lock_tree = RB_ROOT;
2128
2129         osb->s_feature_compat =
2130                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2131         osb->s_feature_ro_compat =
2132                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2133         osb->s_feature_incompat =
2134                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2135
2136         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2137                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2138                      "optional features (%x).\n", i);
2139                 status = -EINVAL;
2140                 goto out_orphan_wipes;
2141         }
2142         if (!sb_rdonly(osb->sb) && (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2143                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2144                      "unsupported optional features (%x).\n", i);
2145                 status = -EINVAL;
2146                 goto out_orphan_wipes;
2147         }
2148
2149         if (ocfs2_clusterinfo_valid(osb)) {
2150                 /*
2151                  * ci_stack and ci_cluster in ocfs2_cluster_info may not be null
2152                  * terminated, so make sure no overflow happens here by using
2153                  * memcpy. Destination strings will always be null terminated
2154                  * because osb is allocated using kzalloc.
2155                  */
2156                 osb->osb_stackflags =
2157                         OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2158                 memcpy(osb->osb_cluster_stack,
2159                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2160                        OCFS2_STACK_LABEL_LEN);
2161                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2162                         mlog(ML_ERROR,
2163                              "couldn't mount because of an invalid "
2164                              "cluster stack label (%s) \n",
2165                              osb->osb_cluster_stack);
2166                         status = -EINVAL;
2167                         goto out_orphan_wipes;
2168                 }
2169                 memcpy(osb->osb_cluster_name,
2170                         OCFS2_RAW_SB(di)->s_cluster_info.ci_cluster,
2171                         OCFS2_CLUSTER_NAME_LEN);
2172         } else {
2173                 /* The empty string is identical with classic tools that
2174                  * don't know about s_cluster_info. */
2175                 osb->osb_cluster_stack[0] = '\0';
2176         }
2177
2178         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2179
2180         /*
2181          * FIXME
2182          * This should be done in ocfs2_journal_init(), but any inode
2183          * writes back operation will cause the filesystem to crash.
2184          */
2185         status = ocfs2_journal_alloc(osb);
2186         if (status < 0)
2187                 goto out_orphan_wipes;
2188
2189         INIT_WORK(&osb->dquot_drop_work, ocfs2_drop_dquot_refs);
2190         init_llist_head(&osb->dquot_drop_list);
2191
2192         /* get some pseudo constants for clustersize bits */
2193         osb->s_clustersize_bits =
2194                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2195         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2196
2197         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2198             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2199                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2200                      osb->s_clustersize);
2201                 status = -EINVAL;
2202                 goto out_journal;
2203         }
2204
2205         total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2206                                                 le32_to_cpu(di->i_clusters));
2207
2208         status = generic_check_addressable(osb->sb->s_blocksize_bits,
2209                                            total_blocks);
2210         if (status) {
2211                 mlog(ML_ERROR, "Volume too large "
2212                      "to mount safely on this system");
2213                 status = -EFBIG;
2214                 goto out_journal;
2215         }
2216
2217         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2218                                  sizeof(di->id2.i_super.s_uuid))) {
2219                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2220                 status = -ENOMEM;
2221                 goto out_journal;
2222         }
2223
2224         strscpy(osb->vol_label, di->id2.i_super.s_label,
2225                 OCFS2_MAX_VOL_LABEL_LEN);
2226         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2227         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2228         osb->first_cluster_group_blkno =
2229                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2230         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2231         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2232         trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2233                                      (unsigned long long)osb->root_blkno,
2234                                      (unsigned long long)osb->system_dir_blkno,
2235                                      osb->s_clustersize_bits);
2236
2237         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2238         if (!osb->osb_dlm_debug) {
2239                 status = -ENOMEM;
2240                 mlog_errno(status);
2241                 goto out_uuid_str;
2242         }
2243
2244         atomic_set(&osb->vol_state, VOLUME_INIT);
2245
2246         /* load root, system_dir, and all global system inodes */
2247         status = ocfs2_init_global_system_inodes(osb);
2248         if (status < 0) {
2249                 mlog_errno(status);
2250                 goto out_dlm_out;
2251         }
2252
2253         /*
2254          * global bitmap
2255          */
2256         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2257                                             OCFS2_INVALID_SLOT);
2258         if (!inode) {
2259                 status = -EINVAL;
2260                 mlog_errno(status);
2261                 goto out_system_inodes;
2262         }
2263
2264         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2265         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2266         iput(inode);
2267
2268         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2269                                  osb->s_feature_incompat) * 8;
2270
2271         status = ocfs2_init_slot_info(osb);
2272         if (status < 0) {
2273                 mlog_errno(status);
2274                 goto out_system_inodes;
2275         }
2276
2277         osb->ocfs2_wq = alloc_ordered_workqueue("ocfs2_wq", WQ_MEM_RECLAIM);
2278         if (!osb->ocfs2_wq) {
2279                 status = -ENOMEM;
2280                 mlog_errno(status);
2281                 goto out_slot_info;
2282         }
2283
2284         return status;
2285
2286 out_slot_info:
2287         ocfs2_free_slot_info(osb);
2288 out_system_inodes:
2289         ocfs2_release_system_inodes(osb);
2290 out_dlm_out:
2291         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2292 out_uuid_str:
2293         kfree(osb->uuid_str);
2294 out_journal:
2295         kfree(osb->journal);
2296 out_orphan_wipes:
2297         kfree(osb->osb_orphan_wipes);
2298 out_slot_recovery_gen:
2299         kfree(osb->slot_recovery_generations);
2300 out_vol_label:
2301         kfree(osb->vol_label);
2302 out_recovery_map:
2303         kfree(osb->recovery_map);
2304 out:
2305         kfree(osb);
2306         sb->s_fs_info = NULL;
2307         return status;
2308 }
2309
2310 /*
2311  * will return: -EAGAIN if it is ok to keep searching for superblocks
2312  *              -EINVAL if there is a bad superblock
2313  *              0 on success
2314  */
2315 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2316                                struct buffer_head *bh,
2317                                u32 blksz,
2318                                struct ocfs2_blockcheck_stats *stats)
2319 {
2320         int status = -EAGAIN;
2321
2322         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2323                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2324                 /* We have to do a raw check of the feature here */
2325                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2326                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2327                         status = ocfs2_block_check_validate(bh->b_data,
2328                                                             bh->b_size,
2329                                                             &di->i_check,
2330                                                             stats);
2331                         if (status)
2332                                 goto out;
2333                 }
2334                 status = -EINVAL;
2335                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2336                         mlog(ML_ERROR, "found superblock with incorrect block "
2337                              "size: found %u, should be %u\n",
2338                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2339                                blksz);
2340                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2341                            OCFS2_MAJOR_REV_LEVEL ||
2342                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2343                            OCFS2_MINOR_REV_LEVEL) {
2344                         mlog(ML_ERROR, "found superblock with bad version: "
2345                              "found %u.%u, should be %u.%u\n",
2346                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2347                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2348                              OCFS2_MAJOR_REV_LEVEL,
2349                              OCFS2_MINOR_REV_LEVEL);
2350                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2351                         mlog(ML_ERROR, "bad block number on superblock: "
2352                              "found %llu, should be %llu\n",
2353                              (unsigned long long)le64_to_cpu(di->i_blkno),
2354                              (unsigned long long)bh->b_blocknr);
2355                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2356                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2357                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2358                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2359                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2360                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2361                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2362                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2363                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2364                         mlog(ML_ERROR,
2365                              "Superblock slots found greater than file system "
2366                              "maximum: found %u, max %u\n",
2367                              le16_to_cpu(di->id2.i_super.s_max_slots),
2368                              OCFS2_MAX_SLOTS);
2369                 } else {
2370                         /* found it! */
2371                         status = 0;
2372                 }
2373         }
2374
2375 out:
2376         if (status && status != -EAGAIN)
2377                 mlog_errno(status);
2378         return status;
2379 }
2380
2381 static int ocfs2_check_volume(struct ocfs2_super *osb)
2382 {
2383         int status;
2384         int dirty;
2385         int local;
2386         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2387                                                   * recover
2388                                                   * ourselves. */
2389
2390         /* Init our journal object. */
2391         status = ocfs2_journal_init(osb, &dirty);
2392         if (status < 0) {
2393                 mlog(ML_ERROR, "Could not initialize journal!\n");
2394                 goto finally;
2395         }
2396
2397         /* Now that journal has been initialized, check to make sure
2398            entire volume is addressable. */
2399         status = ocfs2_journal_addressable(osb);
2400         if (status)
2401                 goto finally;
2402
2403         /* If the journal was unmounted cleanly then we don't want to
2404          * recover anything. Otherwise, journal_load will do that
2405          * dirty work for us :) */
2406         if (!dirty) {
2407                 status = ocfs2_journal_wipe(osb->journal, 0);
2408                 if (status < 0) {
2409                         mlog_errno(status);
2410                         goto finally;
2411                 }
2412         } else {
2413                 printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2414                        "unmounted cleanly, recovering it.\n", osb->dev_str);
2415         }
2416
2417         local = ocfs2_mount_local(osb);
2418
2419         /* will play back anything left in the journal. */
2420         status = ocfs2_journal_load(osb->journal, local, dirty);
2421         if (status < 0) {
2422                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2423                 goto finally;
2424         }
2425
2426         if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
2427                 jbd2_journal_set_features(osb->journal->j_journal,
2428                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2429                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2430         else
2431                 jbd2_journal_clear_features(osb->journal->j_journal,
2432                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2433                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2434
2435         if (dirty) {
2436                 /* recover my local alloc if we didn't unmount cleanly. */
2437                 status = ocfs2_begin_local_alloc_recovery(osb,
2438                                                           osb->slot_num,
2439                                                           &local_alloc);
2440                 if (status < 0) {
2441                         mlog_errno(status);
2442                         goto finally;
2443                 }
2444                 /* we complete the recovery process after we've marked
2445                  * ourselves as mounted. */
2446         }
2447
2448         status = ocfs2_load_local_alloc(osb);
2449         if (status < 0) {
2450                 mlog_errno(status);
2451                 goto finally;
2452         }
2453
2454         if (dirty) {
2455                 /* Recovery will be completed after we've mounted the
2456                  * rest of the volume. */
2457                 osb->local_alloc_copy = local_alloc;
2458                 local_alloc = NULL;
2459         }
2460
2461         /* go through each journal, trylock it and if you get the
2462          * lock, and it's marked as dirty, set the bit in the recover
2463          * map and launch a recovery thread for it. */
2464         status = ocfs2_mark_dead_nodes(osb);
2465         if (status < 0) {
2466                 mlog_errno(status);
2467                 goto finally;
2468         }
2469
2470         status = ocfs2_compute_replay_slots(osb);
2471         if (status < 0)
2472                 mlog_errno(status);
2473
2474 finally:
2475         kfree(local_alloc);
2476
2477         if (status)
2478                 mlog_errno(status);
2479         return status;
2480 }
2481
2482 /*
2483  * The routine gets called from dismount or close whenever a dismount on
2484  * volume is requested and the osb open count becomes 1.
2485  * It will remove the osb from the global list and also free up all the
2486  * initialized resources and fileobject.
2487  */
2488 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2489 {
2490         /* This function assumes that the caller has the main osb resource */
2491
2492         /* ocfs2_initializer_super have already created this workqueue */
2493         if (osb->ocfs2_wq)
2494                 destroy_workqueue(osb->ocfs2_wq);
2495
2496         ocfs2_free_slot_info(osb);
2497
2498         kfree(osb->osb_orphan_wipes);
2499         kfree(osb->slot_recovery_generations);
2500         /* FIXME
2501          * This belongs in journal shutdown, but because we have to
2502          * allocate osb->journal at the middle of ocfs2_initialize_super(),
2503          * we free it here.
2504          */
2505         kfree(osb->journal);
2506         kfree(osb->local_alloc_copy);
2507         kfree(osb->uuid_str);
2508         kfree(osb->vol_label);
2509         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2510         memset(osb, 0, sizeof(struct ocfs2_super));
2511 }
2512
2513 /* Depending on the mount option passed, perform one of the following:
2514  * Put OCFS2 into a readonly state (default)
2515  * Return EIO so that only the process errs
2516  * Fix the error as if fsck.ocfs2 -y
2517  * panic
2518  */
2519 static int ocfs2_handle_error(struct super_block *sb)
2520 {
2521         struct ocfs2_super *osb = OCFS2_SB(sb);
2522         int rv = 0;
2523
2524         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2525         pr_crit("On-disk corruption discovered. "
2526                 "Please run fsck.ocfs2 once the filesystem is unmounted.\n");
2527
2528         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) {
2529                 panic("OCFS2: (device %s): panic forced after error\n",
2530                       sb->s_id);
2531         } else if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_CONT) {
2532                 pr_crit("OCFS2: Returning error to the calling process.\n");
2533                 rv = -EIO;
2534         } else { /* default option */
2535                 rv = -EROFS;
2536                 if (sb_rdonly(sb) && (ocfs2_is_soft_readonly(osb) || ocfs2_is_hard_readonly(osb)))
2537                         return rv;
2538
2539                 pr_crit("OCFS2: File system is now read-only.\n");
2540                 sb->s_flags |= SB_RDONLY;
2541                 ocfs2_set_ro_flag(osb, 0);
2542         }
2543
2544         return rv;
2545 }
2546
2547 int __ocfs2_error(struct super_block *sb, const char *function,
2548                   const char *fmt, ...)
2549 {
2550         struct va_format vaf;
2551         va_list args;
2552
2553         va_start(args, fmt);
2554         vaf.fmt = fmt;
2555         vaf.va = &args;
2556
2557         /* Not using mlog here because we want to show the actual
2558          * function the error came from. */
2559         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %pV",
2560                sb->s_id, function, &vaf);
2561
2562         va_end(args);
2563
2564         return ocfs2_handle_error(sb);
2565 }
2566
2567 /* Handle critical errors. This is intentionally more drastic than
2568  * ocfs2_handle_error, so we only use for things like journal errors,
2569  * etc. */
2570 void __ocfs2_abort(struct super_block *sb, const char *function,
2571                    const char *fmt, ...)
2572 {
2573         struct va_format vaf;
2574         va_list args;
2575
2576         va_start(args, fmt);
2577
2578         vaf.fmt = fmt;
2579         vaf.va = &args;
2580
2581         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %pV",
2582                sb->s_id, function, &vaf);
2583
2584         va_end(args);
2585
2586         /* We don't have the cluster support yet to go straight to
2587          * hard readonly in here. Until then, we want to keep
2588          * ocfs2_abort() so that we can at least mark critical
2589          * errors.
2590          *
2591          * TODO: This should abort the journal and alert other nodes
2592          * that our slot needs recovery. */
2593
2594         /* Force a panic(). This stinks, but it's better than letting
2595          * things continue without having a proper hard readonly
2596          * here. */
2597         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2598                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2599         ocfs2_handle_error(sb);
2600 }
2601
2602 /*
2603  * Void signal blockers, because in-kernel sigprocmask() only fails
2604  * when SIG_* is wrong.
2605  */
2606 void ocfs2_block_signals(sigset_t *oldset)
2607 {
2608         int rc;
2609         sigset_t blocked;
2610
2611         sigfillset(&blocked);
2612         rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2613         BUG_ON(rc);
2614 }
2615
2616 void ocfs2_unblock_signals(sigset_t *oldset)
2617 {
2618         int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2619         BUG_ON(rc);
2620 }
2621
2622 module_init(ocfs2_init);
2623 module_exit(ocfs2_exit);