fs/ocfs2/super.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/init.h>
  32 #include <linux/random.h>
  33 #include <linux/statfs.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/socket.h>
  37 #include <linux/inet.h>
  38 #include <linux/parser.h>
  39 #include <linux/crc32.h>
  40 #include <linux/debugfs.h>
  41 #include <linux/mount.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/quotaops.h>
  44
  45 #define MLOG_MASK_PREFIX ML_SUPER
  46 #include <cluster/masklog.h>
  47
  48 #include "ocfs2.h"
  49
  50 /* this should be the only file to include a version 1 header */
  51 #include "ocfs1_fs_compat.h"
  52
  53 #include "alloc.h"
  54 #include "blockcheck.h"
  55 #include "dlmglue.h"
  56 #include "export.h"
  57 #include "extent_map.h"
  58 #include "heartbeat.h"
  59 #include "inode.h"
  60 #include "journal.h"
  61 #include "localalloc.h"
  62 #include "namei.h"
  63 #include "slot_map.h"
  64 #include "super.h"
  65 #include "sysfile.h"
  66 #include "uptodate.h"
  67 #include "ver.h"
  68 #include "xattr.h"
  69 #include "quota.h"
  70 #include "refcounttree.h"
  71 #include "suballoc.h"
  72
  73 #include "buffer_head_io.h"
  74
  75 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  76 struct kmem_cache *ocfs2_dquot_cachep;
  77 struct kmem_cache *ocfs2_qf_chunk_cachep;
  78
  79 /* OCFS2 needs to schedule several differnt types of work which
  80  * require cluster locking, disk I/O, recovery waits, etc. Since these
  81  * types of work tend to be heavy we avoid using the kernel events
  82  * workqueue and schedule on our own. */
  83 struct workqueue_struct *ocfs2_wq = NULL;
  84
  85 static struct dentry *ocfs2_debugfs_root = NULL;
  86
  87 MODULE_AUTHOR("Oracle");
  88 MODULE_LICENSE("GPL");
  89
  90 struct mount_options
  91 {
  92         unsigned long   commit_interval;
  93         unsigned long   mount_opt;
  94         unsigned int    atime_quantum;
  95         signed short    slot;
  96         int             localalloc_opt;
  97         unsigned int    resv_level;
  98         int             dir_resv_level;
  99         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
 100 };
 101
 102 static int ocfs2_parse_options(struct super_block *sb, char *options,
 103                                struct mount_options *mopt,
 104                                int is_remount);
 105 static int ocfs2_check_set_options(struct super_block *sb,
 106                                    struct mount_options *options);
 107 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 108 static void ocfs2_put_super(struct super_block *sb);
 109 static int ocfs2_mount_volume(struct super_block *sb);
 110 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 111 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 112 static int ocfs2_initialize_mem_caches(void);
 113 static void ocfs2_free_mem_caches(void);
 114 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 115
 116 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 117
 118 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 119
 120 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 121 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 122 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 123 static int ocfs2_check_volume(struct ocfs2_super *osb);
 124 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 125                                struct buffer_head *bh,
 126                                u32 sectsize,
 127                                struct ocfs2_blockcheck_stats *stats);
 128 static int ocfs2_initialize_super(struct super_block *sb,
 129                                   struct buffer_head *bh,
 130                                   int sector_size,
 131                                   struct ocfs2_blockcheck_stats *stats);
 132 static int ocfs2_get_sector(struct super_block *sb,
 133                             struct buffer_head **bh,
 134                             int block,
 135                             int sect_size);
 136 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 137 static void ocfs2_destroy_inode(struct inode *inode);
 138 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 139 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 140 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 141
 142 static const struct super_operations ocfs2_sops = {
 143         .statfs         = ocfs2_statfs,
 144         .alloc_inode    = ocfs2_alloc_inode,
 145         .destroy_inode  = ocfs2_destroy_inode,
 146         .drop_inode     = ocfs2_drop_inode,
 147         .evict_inode    = ocfs2_evict_inode,
 148         .sync_fs        = ocfs2_sync_fs,
 149         .put_super      = ocfs2_put_super,
 150         .remount_fs     = ocfs2_remount,
 151         .show_options   = ocfs2_show_options,
 152         .quota_read     = ocfs2_quota_read,
 153         .quota_write    = ocfs2_quota_write,
 154 };
 155
 156 enum {
 157         Opt_barrier,
 158         Opt_err_panic,
 159         Opt_err_ro,
 160         Opt_intr,
 161         Opt_nointr,
 162         Opt_hb_none,
 163         Opt_hb_local,
 164         Opt_hb_global,
 165         Opt_data_ordered,
 166         Opt_data_writeback,
 167         Opt_atime_quantum,
 168         Opt_slot,
 169         Opt_commit,
 170         Opt_localalloc,
 171         Opt_localflocks,
 172         Opt_stack,
 173         Opt_user_xattr,
 174         Opt_nouser_xattr,
 175         Opt_inode64,
 176         Opt_acl,
 177         Opt_noacl,
 178         Opt_usrquota,
 179         Opt_grpquota,
 180         Opt_coherency_buffered,
 181         Opt_coherency_full,
 182         Opt_resv_level,
 183         Opt_dir_resv_level,
 184         Opt_err,
 185 };
 186
 187 static const match_table_t tokens = {
 188         {Opt_barrier, "barrier=%u"},
 189         {Opt_err_panic, "errors=panic"},
 190         {Opt_err_ro, "errors=remount-ro"},
 191         {Opt_intr, "intr"},
 192         {Opt_nointr, "nointr"},
 193         {Opt_hb_none, OCFS2_HB_NONE},
 194         {Opt_hb_local, OCFS2_HB_LOCAL},
 195         {Opt_hb_global, OCFS2_HB_GLOBAL},
 196         {Opt_data_ordered, "data=ordered"},
 197         {Opt_data_writeback, "data=writeback"},
 198         {Opt_atime_quantum, "atime_quantum=%u"},
 199         {Opt_slot, "preferred_slot=%u"},
 200         {Opt_commit, "commit=%u"},
 201         {Opt_localalloc, "localalloc=%d"},
 202         {Opt_localflocks, "localflocks"},
 203         {Opt_stack, "cluster_stack=%s"},
 204         {Opt_user_xattr, "user_xattr"},
 205         {Opt_nouser_xattr, "nouser_xattr"},
 206         {Opt_inode64, "inode64"},
 207         {Opt_acl, "acl"},
 208         {Opt_noacl, "noacl"},
 209         {Opt_usrquota, "usrquota"},
 210         {Opt_grpquota, "grpquota"},
 211         {Opt_coherency_buffered, "coherency=buffered"},
 212         {Opt_coherency_full, "coherency=full"},
 213         {Opt_resv_level, "resv_level=%u"},
 214         {Opt_dir_resv_level, "dir_resv_level=%u"},
 215         {Opt_err, NULL}
 216 };
 217
 218 #ifdef CONFIG_DEBUG_FS
 219 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 220 {
 221         struct ocfs2_cluster_connection *cconn = osb->cconn;
 222         struct ocfs2_recovery_map *rm = osb->recovery_map;
 223         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 224         int i, out = 0;
 225
 226         out += snprintf(buf + out, len - out,
 227                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 228                         "Device", osb->dev_str, osb->uuid_str,
 229                         osb->fs_generation, osb->vol_label);
 230
 231         out += snprintf(buf + out, len - out,
 232                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 233                         atomic_read(&osb->vol_state), osb->osb_flags);
 234
 235         out += snprintf(buf + out, len - out,
 236                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 237                         osb->sb->s_blocksize, osb->s_clustersize);
 238
 239         out += snprintf(buf + out, len - out,
 240                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 241                         "ROcompat: 0x%X\n",
 242                         "Features", osb->s_feature_compat,
 243                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 244
 245         out += snprintf(buf + out, len - out,
 246                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 247                         osb->s_mount_opt, osb->s_atime_quantum);
 248
 249         if (cconn) {
 250                 out += snprintf(buf + out, len - out,
 251                                 "%10s => Stack: %s  Name: %*s  "
 252                                 "Version: %d.%d\n", "Cluster",
 253                                 (*osb->osb_cluster_stack == '\0' ?
 254                                  "o2cb" : osb->osb_cluster_stack),
 255                                 cconn->cc_namelen, cconn->cc_name,
 256                                 cconn->cc_version.pv_major,
 257                                 cconn->cc_version.pv_minor);
 258         }
 259
 260         spin_lock(&osb->dc_task_lock);
 261         out += snprintf(buf + out, len - out,
 262                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 263                         "WorkSeq: %lu\n", "DownCnvt",
 264                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 265                         osb->blocked_lock_count, osb->dc_wake_sequence,
 266                         osb->dc_work_sequence);
 267         spin_unlock(&osb->dc_task_lock);
 268
 269         spin_lock(&osb->osb_lock);
 270         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 271                         "Recovery",
 272                         (osb->recovery_thread_task ?
 273                          task_pid_nr(osb->recovery_thread_task) : -1));
 274         if (rm->rm_used == 0)
 275                 out += snprintf(buf + out, len - out, " None\n");
 276         else {
 277                 for (i = 0; i < rm->rm_used; i++)
 278                         out += snprintf(buf + out, len - out, " %d",
 279                                         rm->rm_entries[i]);
 280                 out += snprintf(buf + out, len - out, "\n");
 281         }
 282         spin_unlock(&osb->osb_lock);
 283
 284         out += snprintf(buf + out, len - out,
 285                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 286                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 287                         osb->osb_commit_interval,
 288                         atomic_read(&osb->needs_checkpoint));
 289
 290         out += snprintf(buf + out, len - out,
 291                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 292                         "Journal", osb->journal->j_state,
 293                         osb->journal->j_trans_id,
 294                         atomic_read(&osb->journal->j_num_trans));
 295
 296         out += snprintf(buf + out, len - out,
 297                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 298                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 299                         "Stats",
 300                         atomic_read(&osb->alloc_stats.bitmap_data),
 301                         atomic_read(&osb->alloc_stats.local_data),
 302                         atomic_read(&osb->alloc_stats.bg_allocs),
 303                         atomic_read(&osb->alloc_stats.moves),
 304                         atomic_read(&osb->alloc_stats.bg_extends));
 305
 306         out += snprintf(buf + out, len - out,
 307                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 308                         "Default: %u bits\n",
 309                         "LocalAlloc", osb->local_alloc_state,
 310                         (unsigned long long)osb->la_last_gd,
 311                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 312
 313         spin_lock(&osb->osb_lock);
 314         out += snprintf(buf + out, len - out,
 315                         "%10s => InodeSlot: %d  StolenInodes: %d, "
 316                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
 317                         osb->s_inode_steal_slot,
 318                         atomic_read(&osb->s_num_inodes_stolen),
 319                         osb->s_meta_steal_slot,
 320                         atomic_read(&osb->s_num_meta_stolen));
 321         spin_unlock(&osb->osb_lock);
 322
 323         out += snprintf(buf + out, len - out, "OrphanScan => ");
 324         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 325                         os->os_count, os->os_seqno);
 326         out += snprintf(buf + out, len - out, " Last Scan: ");
 327         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 328                 out += snprintf(buf + out, len - out, "Disabled\n");
 329         else
 330                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 331                                 (get_seconds() - os->os_scantime.tv_sec));
 332
 333         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 334                         "Slots", "Num", "RecoGen");
 335         for (i = 0; i < osb->max_slots; ++i) {
 336                 out += snprintf(buf + out, len - out,
 337                                 "%10s  %c %3d  %10d\n",
 338                                 " ",
 339                                 (i == osb->slot_num ? '*' : ' '),
 340                                 i, osb->slot_recovery_generations[i]);
 341         }
 342
 343         return out;
 344 }
 345
 346 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 347 {
 348         struct ocfs2_super *osb = inode->i_private;
 349         char *buf = NULL;
 350
 351         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 352         if (!buf)
 353                 goto bail;
 354
 355         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 356
 357         file->private_data = buf;
 358
 359         return 0;
 360 bail:
 361         return -ENOMEM;
 362 }
 363
 364 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 365 {
 366         kfree(file->private_data);
 367         return 0;
 368 }
 369
 370 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 371                                 size_t nbytes, loff_t *ppos)
 372 {
 373         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 374                                        i_size_read(file->f_mapping->host));
 375 }
 376 #else
 377 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 378 {
 379         return 0;
 380 }
 381 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 382 {
 383         return 0;
 384 }
 385 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 386                                 size_t nbytes, loff_t *ppos)
 387 {
 388         return 0;
 389 }
 390 #endif  /* CONFIG_DEBUG_FS */
 391
 392 static const struct file_operations ocfs2_osb_debug_fops = {
 393         .open =         ocfs2_osb_debug_open,
 394         .release =      ocfs2_debug_release,
 395         .read =         ocfs2_debug_read,
 396         .llseek =       generic_file_llseek,
 397 };
 398
 399 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 400 {
 401         int status;
 402         tid_t target;
 403         struct ocfs2_super *osb = OCFS2_SB(sb);
 404
 405         if (ocfs2_is_hard_readonly(osb))
 406                 return -EROFS;
 407
 408         if (wait) {
 409                 status = ocfs2_flush_truncate_log(osb);
 410                 if (status < 0)
 411                         mlog_errno(status);
 412         } else {
 413                 ocfs2_schedule_truncate_log_flush(osb, 0);
 414         }
 415
 416         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 417                                       &target)) {
 418                 if (wait)
 419                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 420                                              target);
 421         }
 422         return 0;
 423 }
 424
 425 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 426 {
 427         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 428             && (ino == USER_QUOTA_SYSTEM_INODE
 429                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 430                 return 0;
 431         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 432             && (ino == GROUP_QUOTA_SYSTEM_INODE
 433                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 434                 return 0;
 435         return 1;
 436 }
 437
 438 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 439 {
 440         struct inode *new = NULL;
 441         int status = 0;
 442         int i;
 443
 444         mlog_entry_void();
 445
 446         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 447         if (IS_ERR(new)) {
 448                 status = PTR_ERR(new);
 449                 mlog_errno(status);
 450                 goto bail;
 451         }
 452         osb->root_inode = new;
 453
 454         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 455         if (IS_ERR(new)) {
 456                 status = PTR_ERR(new);
 457                 mlog_errno(status);
 458                 goto bail;
 459         }
 460         osb->sys_root_inode = new;
 461
 462         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 463              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 464                 if (!ocfs2_need_system_inode(osb, i))
 465                         continue;
 466                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 467                 if (!new) {
 468                         ocfs2_release_system_inodes(osb);
 469                         status = -EINVAL;
 470                         mlog_errno(status);
 471                         /* FIXME: Should ERROR_RO_FS */
 472                         mlog(ML_ERROR, "Unable to load system inode %d, "
 473                              "possibly corrupt fs?", i);
 474                         goto bail;
 475                 }
 476                 // the array now has one ref, so drop this one
 477                 iput(new);
 478         }
 479
 480 bail:
 481         mlog_exit(status);
 482         return status;
 483 }
 484
 485 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 486 {
 487         struct inode *new = NULL;
 488         int status = 0;
 489         int i;
 490
 491         mlog_entry_void();
 492
 493         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 494              i < NUM_SYSTEM_INODES;
 495              i++) {
 496                 if (!ocfs2_need_system_inode(osb, i))
 497                         continue;
 498                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 499                 if (!new) {
 500                         ocfs2_release_system_inodes(osb);
 501                         status = -EINVAL;
 502                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 503                              status, i, osb->slot_num);
 504                         goto bail;
 505                 }
 506                 /* the array now has one ref, so drop this one */
 507                 iput(new);
 508         }
 509
 510 bail:
 511         mlog_exit(status);
 512         return status;
 513 }
 514
 515 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 516 {
 517         int i;
 518         struct inode *inode;
 519
 520         mlog_entry_void();
 521
 522         for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
 523                 inode = osb->global_system_inodes[i];
 524                 if (inode) {
 525                         iput(inode);
 526                         osb->global_system_inodes[i] = NULL;
 527                 }
 528         }
 529
 530         inode = osb->sys_root_inode;
 531         if (inode) {
 532                 iput(inode);
 533                 osb->sys_root_inode = NULL;
 534         }
 535
 536         inode = osb->root_inode;
 537         if (inode) {
 538                 iput(inode);
 539                 osb->root_inode = NULL;
 540         }
 541
 542         if (!osb->local_system_inodes)
 543                 goto out;
 544
 545         for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
 546                 if (osb->local_system_inodes[i]) {
 547                         iput(osb->local_system_inodes[i]);
 548                         osb->local_system_inodes[i] = NULL;
 549                 }
 550         }
 551
 552         kfree(osb->local_system_inodes);
 553         osb->local_system_inodes = NULL;
 554
 555 out:
 556         mlog_exit(0);
 557 }
 558
 559 /* We're allocating fs objects, use GFP_NOFS */
 560 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 561 {
 562         struct ocfs2_inode_info *oi;
 563
 564         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 565         if (!oi)
 566                 return NULL;
 567
 568         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 569         return &oi->vfs_inode;
 570 }
 571
 572 static void ocfs2_i_callback(struct rcu_head *head)
 573 {
 574         struct inode *inode = container_of(head, struct inode, i_rcu);
 575         INIT_LIST_HEAD(&inode->i_dentry);
 576         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 577 }
 578
 579 static void ocfs2_destroy_inode(struct inode *inode)
 580 {
 581         call_rcu(&inode->i_rcu, ocfs2_i_callback);
 582 }
 583
 584 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 585                                                 unsigned int cbits)
 586 {
 587         unsigned int bytes = 1 << cbits;
 588         unsigned int trim = bytes;
 589         unsigned int bitshift = 32;
 590
 591         /*
 592          * i_size and all block offsets in ocfs2 are always 64 bits
 593          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 594          * 64 bit platforms, cluster size will be the limiting factor.
 595          */
 596
 597 #if BITS_PER_LONG == 32
 598 # if defined(CONFIG_LBDAF)
 599         BUILD_BUG_ON(sizeof(sector_t) != 8);
 600         /*
 601          * We might be limited by page cache size.
 602          */
 603         if (bytes > PAGE_CACHE_SIZE) {
 604                 bytes = PAGE_CACHE_SIZE;
 605                 trim = 1;
 606                 /*
 607                  * Shift by 31 here so that we don't get larger than
 608                  * MAX_LFS_FILESIZE
 609                  */
 610                 bitshift = 31;
 611         }
 612 # else
 613         /*
 614          * We are limited by the size of sector_t. Use block size, as
 615          * that's what we expose to the VFS.
 616          */
 617         bytes = 1 << bbits;
 618         trim = 1;
 619         bitshift = 31;
 620 # endif
 621 #endif
 622
 623         /*
 624          * Trim by a whole cluster when we can actually approach the
 625          * on-disk limits. Otherwise we can overflow i_clusters when
 626          * an extent start is at the max offset.
 627          */
 628         return (((unsigned long long)bytes) << bitshift) - trim;
 629 }
 630
 631 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 632 {
 633         int incompat_features;
 634         int ret = 0;
 635         struct mount_options parsed_options;
 636         struct ocfs2_super *osb = OCFS2_SB(sb);
 637         u32 tmp;
 638
 639         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
 640             !ocfs2_check_set_options(sb, &parsed_options)) {
 641                 ret = -EINVAL;
 642                 goto out;
 643         }
 644
 645         tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
 646                 OCFS2_MOUNT_HB_NONE;
 647         if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
 648                 ret = -EINVAL;
 649                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 650                 goto out;
 651         }
 652
 653         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 654             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 655                 ret = -EINVAL;
 656                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 657                 goto out;
 658         }
 659
 660         /* Probably don't want this on remount; it might
 661          * mess with other nodes */
 662         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 663             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 664                 ret = -EINVAL;
 665                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 666                 goto out;
 667         }
 668
 669         /* We're going to/from readonly mode. */
 670         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 671                 /* Disable quota accounting before remounting RO */
 672                 if (*flags & MS_RDONLY) {
 673                         ret = ocfs2_susp_quotas(osb, 0);
 674                         if (ret < 0)
 675                                 goto out;
 676                 }
 677                 /* Lock here so the check of HARD_RO and the potential
 678                  * setting of SOFT_RO is atomic. */
 679                 spin_lock(&osb->osb_lock);
 680                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 681                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 682                         ret = -EROFS;
 683                         goto unlock_osb;
 684                 }
 685
 686                 if (*flags & MS_RDONLY) {
 687                         mlog(0, "Going to ro mode.\n");
 688                         sb->s_flags |= MS_RDONLY;
 689                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 690                 } else {
 691                         mlog(0, "Making ro filesystem writeable.\n");
 692
 693                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 694                                 mlog(ML_ERROR, "Cannot remount RDWR "
 695                                      "filesystem due to previous errors.\n");
 696                                 ret = -EROFS;
 697                                 goto unlock_osb;
 698                         }
 699                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 700                         if (incompat_features) {
 701                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 702                                      "of unsupported optional features "
 703                                      "(%x).\n", incompat_features);
 704                                 ret = -EINVAL;
 705                                 goto unlock_osb;
 706                         }
 707                         sb->s_flags &= ~MS_RDONLY;
 708                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 709                 }
 710 unlock_osb:
 711                 spin_unlock(&osb->osb_lock);
 712                 /* Enable quota accounting after remounting RW */
 713                 if (!ret && !(*flags & MS_RDONLY)) {
 714                         if (sb_any_quota_suspended(sb))
 715                                 ret = ocfs2_susp_quotas(osb, 1);
 716                         else
 717                                 ret = ocfs2_enable_quotas(osb);
 718                         if (ret < 0) {
 719                                 /* Return back changes... */
 720                                 spin_lock(&osb->osb_lock);
 721                                 sb->s_flags |= MS_RDONLY;
 722                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 723                                 spin_unlock(&osb->osb_lock);
 724                                 goto out;
 725                         }
 726                 }
 727         }
 728
 729         if (!ret) {
 730                 /* Only save off the new mount options in case of a successful
 731                  * remount. */
 732                 osb->s_mount_opt = parsed_options.mount_opt;
 733                 osb->s_atime_quantum = parsed_options.atime_quantum;
 734                 osb->preferred_slot = parsed_options.slot;
 735                 if (parsed_options.commit_interval)
 736                         osb->osb_commit_interval = parsed_options.commit_interval;
 737
 738                 if (!ocfs2_is_hard_readonly(osb))
 739                         ocfs2_set_journal_params(osb);
 740
 741                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 742                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
 743                                                         MS_POSIXACL : 0);
 744         }
 745 out:
 746         return ret;
 747 }
 748
 749 static int ocfs2_sb_probe(struct super_block *sb,
 750                           struct buffer_head **bh,
 751                           int *sector_size,
 752                           struct ocfs2_blockcheck_stats *stats)
 753 {
 754         int status, tmpstat;
 755         struct ocfs1_vol_disk_hdr *hdr;
 756         struct ocfs2_dinode *di;
 757         int blksize;
 758
 759         *bh = NULL;
 760
 761         /* may be > 512 */
 762         *sector_size = bdev_logical_block_size(sb->s_bdev);
 763         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 764                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 765                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 766                 status = -EINVAL;
 767                 goto bail;
 768         }
 769
 770         /* Can this really happen? */
 771         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 772                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 773
 774         /* check block zero for old format */
 775         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 776         if (status < 0) {
 777                 mlog_errno(status);
 778                 goto bail;
 779         }
 780         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 781         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 782                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 783                      hdr->major_version, hdr->minor_version);
 784                 status = -EINVAL;
 785         }
 786         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 787                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 788                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 789                      hdr->signature);
 790                 status = -EINVAL;
 791         }
 792         brelse(*bh);
 793         *bh = NULL;
 794         if (status < 0) {
 795                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 796                      "upgraded before mounting with ocfs v2\n");
 797                 goto bail;
 798         }
 799
 800         /*
 801          * Now check at magic offset for 512, 1024, 2048, 4096
 802          * blocksizes.  4096 is the maximum blocksize because it is
 803          * the minimum clustersize.
 804          */
 805         status = -EINVAL;
 806         for (blksize = *sector_size;
 807              blksize <= OCFS2_MAX_BLOCKSIZE;
 808              blksize <<= 1) {
 809                 tmpstat = ocfs2_get_sector(sb, bh,
 810                                            OCFS2_SUPER_BLOCK_BLKNO,
 811                                            blksize);
 812                 if (tmpstat < 0) {
 813                         status = tmpstat;
 814                         mlog_errno(status);
 815                         break;
 816                 }
 817                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 818                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 819                 spin_lock_init(&stats->b_lock);
 820                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 821                 if (tmpstat < 0) {
 822                         brelse(*bh);
 823                         *bh = NULL;
 824                 }
 825                 if (tmpstat != -EAGAIN) {
 826                         status = tmpstat;
 827                         break;
 828                 }
 829         }
 830
 831 bail:
 832         return status;
 833 }
 834
 835 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 836 {
 837         u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
 838
 839         if (osb->s_mount_opt & hb_enabled) {
 840                 if (ocfs2_mount_local(osb)) {
 841                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 842                              "mounted device.\n");
 843                         return -EINVAL;
 844                 }
 845                 if (ocfs2_userspace_stack(osb)) {
 846                         mlog(ML_ERROR, "Userspace stack expected, but "
 847                              "o2cb heartbeat arguments passed to mount\n");
 848                         return -EINVAL;
 849                 }
 850                 if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
 851                      !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
 852                     ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
 853                      ocfs2_cluster_o2cb_global_heartbeat(osb))) {
 854                         mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
 855                         return -EINVAL;
 856                 }
 857         }
 858
 859         if (!(osb->s_mount_opt & hb_enabled)) {
 860                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 861                     !ocfs2_userspace_stack(osb)) {
 862                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 863                              "a read-write clustered device.\n");
 864                         return -EINVAL;
 865                 }
 866         }
 867
 868         return 0;
 869 }
 870
 871 /*
 872  * If we're using a userspace stack, mount should have passed
 873  * a name that matches the disk.  If not, mount should not
 874  * have passed a stack.
 875  */
 876 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 877                                         struct mount_options *mopt)
 878 {
 879         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 880                 mlog(ML_ERROR,
 881                      "cluster stack passed to mount, but this filesystem "
 882                      "does not support it\n");
 883                 return -EINVAL;
 884         }
 885
 886         if (ocfs2_userspace_stack(osb) &&
 887             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 888                     OCFS2_STACK_LABEL_LEN)) {
 889                 mlog(ML_ERROR,
 890                      "cluster stack passed to mount (\"%s\") does not "
 891                      "match the filesystem (\"%s\")\n",
 892                      mopt->cluster_stack,
 893                      osb->osb_cluster_stack);
 894                 return -EINVAL;
 895         }
 896
 897         return 0;
 898 }
 899
 900 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 901 {
 902         int type;
 903         struct super_block *sb = osb->sb;
 904         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 905                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 906         int status = 0;
 907
 908         for (type = 0; type < MAXQUOTAS; type++) {
 909                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 910                         continue;
 911                 if (unsuspend)
 912                         status = dquot_resume(sb, type);
 913                 else {
 914                         struct ocfs2_mem_dqinfo *oinfo;
 915
 916                         /* Cancel periodic syncing before suspending */
 917                         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 918                         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 919                         status = dquot_suspend(sb, type);
 920                 }
 921                 if (status < 0)
 922                         break;
 923         }
 924         if (status < 0)
 925                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 926                      "remount (error = %d).\n", status);
 927         return status;
 928 }
 929
 930 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 931 {
 932         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 933         struct super_block *sb = osb->sb;
 934         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 935                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 936         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 937                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 938         int status;
 939         int type;
 940
 941         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 942         for (type = 0; type < MAXQUOTAS; type++) {
 943                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 944                         continue;
 945                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 946                                                         osb->slot_num);
 947                 if (!inode[type]) {
 948                         status = -ENOENT;
 949                         goto out_quota_off;
 950                 }
 951                 status = dquot_enable(inode[type], type, QFMT_OCFS2,
 952                                       DQUOT_USAGE_ENABLED);
 953                 if (status < 0)
 954                         goto out_quota_off;
 955         }
 956
 957         for (type = 0; type < MAXQUOTAS; type++)
 958                 iput(inode[type]);
 959         return 0;
 960 out_quota_off:
 961         ocfs2_disable_quotas(osb);
 962         for (type = 0; type < MAXQUOTAS; type++)
 963                 iput(inode[type]);
 964         mlog_errno(status);
 965         return status;
 966 }
 967
 968 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 969 {
 970         int type;
 971         struct inode *inode;
 972         struct super_block *sb = osb->sb;
 973         struct ocfs2_mem_dqinfo *oinfo;
 974
 975         /* We mostly ignore errors in this function because there's not much
 976          * we can do when we see them */
 977         for (type = 0; type < MAXQUOTAS; type++) {
 978                 if (!sb_has_quota_loaded(sb, type))
 979                         continue;
 980                 /* Cancel periodic syncing before we grab dqonoff_mutex */
 981                 oinfo = sb_dqinfo(sb, type)->dqi_priv;
 982                 cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 983                 inode = igrab(sb->s_dquot.files[type]);
 984                 /* Turn off quotas. This will remove all dquot structures from
 985                  * memory and so they will be automatically synced to global
 986                  * quota files */
 987                 dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
 988                                         DQUOT_LIMITS_ENABLED);
 989                 if (!inode)
 990                         continue;
 991                 iput(inode);
 992         }
 993 }
 994
 995 /* Handle quota on quotactl */
 996 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id)
 997 {
 998         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 999                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
1000
1001         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
1002                 return -EINVAL;
1003
1004         return dquot_enable(sb_dqopt(sb)->files[type], type,
1005                             format_id, DQUOT_LIMITS_ENABLED);
1006 }
1007
1008 /* Handle quota off quotactl */
1009 static int ocfs2_quota_off(struct super_block *sb, int type)
1010 {
1011         return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
1012 }
1013
1014 static const struct quotactl_ops ocfs2_quotactl_ops = {
1015         .quota_on_meta  = ocfs2_quota_on,
1016         .quota_off      = ocfs2_quota_off,
1017         .quota_sync     = dquot_quota_sync,
1018         .get_info       = dquot_get_dqinfo,
1019         .set_info       = dquot_set_dqinfo,
1020         .get_dqblk      = dquot_get_dqblk,
1021         .set_dqblk      = dquot_set_dqblk,
1022 };
1023
1024 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1025 {
1026         struct dentry *root;
1027         int status, sector_size;
1028         struct mount_options parsed_options;
1029         struct inode *inode = NULL;
1030         struct ocfs2_super *osb = NULL;
1031         struct buffer_head *bh = NULL;
1032         char nodestr[8];
1033         struct ocfs2_blockcheck_stats stats;
1034
1035         mlog_entry("%p, %p, %i", sb, data, silent);
1036
1037         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1038                 status = -EINVAL;
1039                 goto read_super_error;
1040         }
1041
1042         /* probe for superblock */
1043         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1044         if (status < 0) {
1045                 mlog(ML_ERROR, "superblock probe failed!\n");
1046                 goto read_super_error;
1047         }
1048
1049         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1050         osb = OCFS2_SB(sb);
1051         if (status < 0) {
1052                 mlog_errno(status);
1053                 goto read_super_error;
1054         }
1055         brelse(bh);
1056         bh = NULL;
1057
1058         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1059                 status = -EINVAL;
1060                 goto read_super_error;
1061         }
1062         osb->s_mount_opt = parsed_options.mount_opt;
1063         osb->s_atime_quantum = parsed_options.atime_quantum;
1064         osb->preferred_slot = parsed_options.slot;
1065         osb->osb_commit_interval = parsed_options.commit_interval;
1066
1067         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1068         osb->osb_resv_level = parsed_options.resv_level;
1069         osb->osb_dir_resv_level = parsed_options.resv_level;
1070         if (parsed_options.dir_resv_level == -1)
1071                 osb->osb_dir_resv_level = parsed_options.resv_level;
1072         else
1073                 osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1074
1075         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1076         if (status)
1077                 goto read_super_error;
1078
1079         sb->s_magic = OCFS2_SUPER_MAGIC;
1080
1081         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1082                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1083
1084         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1085          * heartbeat=none */
1086         if (bdev_read_only(sb->s_bdev)) {
1087                 if (!(sb->s_flags & MS_RDONLY)) {
1088                         status = -EACCES;
1089                         mlog(ML_ERROR, "Readonly device detected but readonly "
1090                              "mount was not specified.\n");
1091                         goto read_super_error;
1092                 }
1093
1094                 /* You should not be able to start a local heartbeat
1095                  * on a readonly device. */
1096                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1097                         status = -EROFS;
1098                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1099                              "device.\n");
1100                         goto read_super_error;
1101                 }
1102
1103                 status = ocfs2_check_journals_nolocks(osb);
1104                 if (status < 0) {
1105                         if (status == -EROFS)
1106                                 mlog(ML_ERROR, "Recovery required on readonly "
1107                                      "file system, but write access is "
1108                                      "unavailable.\n");
1109                         else
1110                                 mlog_errno(status);
1111                         goto read_super_error;
1112                 }
1113
1114                 ocfs2_set_ro_flag(osb, 1);
1115
1116                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1117                        "services will be utilized for this mount. Recovery "
1118                        "will be skipped.\n");
1119         }
1120
1121         if (!ocfs2_is_hard_readonly(osb)) {
1122                 if (sb->s_flags & MS_RDONLY)
1123                         ocfs2_set_ro_flag(osb, 0);
1124         }
1125
1126         status = ocfs2_verify_heartbeat(osb);
1127         if (status < 0) {
1128                 mlog_errno(status);
1129                 goto read_super_error;
1130         }
1131
1132         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1133                                                  ocfs2_debugfs_root);
1134         if (!osb->osb_debug_root) {
1135                 status = -EINVAL;
1136                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1137                 goto read_super_error;
1138         }
1139
1140         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1141                                             osb->osb_debug_root,
1142                                             osb,
1143                                             &ocfs2_osb_debug_fops);
1144         if (!osb->osb_ctxt) {
1145                 status = -EINVAL;
1146                 mlog_errno(status);
1147                 goto read_super_error;
1148         }
1149
1150         if (ocfs2_meta_ecc(osb)) {
1151                 status = ocfs2_blockcheck_stats_debugfs_install(
1152                                                 &osb->osb_ecc_stats,
1153                                                 osb->osb_debug_root);
1154                 if (status) {
1155                         mlog(ML_ERROR,
1156                              "Unable to create blockcheck statistics "
1157                              "files\n");
1158                         goto read_super_error;
1159                 }
1160         }
1161
1162         status = ocfs2_mount_volume(sb);
1163         if (osb->root_inode)
1164                 inode = igrab(osb->root_inode);
1165
1166         if (status < 0)
1167                 goto read_super_error;
1168
1169         if (!inode) {
1170                 status = -EIO;
1171                 mlog_errno(status);
1172                 goto read_super_error;
1173         }
1174
1175         root = d_alloc_root(inode);
1176         if (!root) {
1177                 status = -ENOMEM;
1178                 mlog_errno(status);
1179                 goto read_super_error;
1180         }
1181
1182         sb->s_root = root;
1183
1184         ocfs2_complete_mount_recovery(osb);
1185
1186         if (ocfs2_mount_local(osb))
1187                 snprintf(nodestr, sizeof(nodestr), "local");
1188         else
1189                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1190
1191         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1192                "with %s data mode.\n",
1193                osb->dev_str, nodestr, osb->slot_num,
1194                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1195                "ordered");
1196
1197         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1198         wake_up(&osb->osb_mount_event);
1199
1200         /* Now we can initialize quotas because we can afford to wait
1201          * for cluster locks recovery now. That also means that truncation
1202          * log recovery can happen but that waits for proper quota setup */
1203         if (!(sb->s_flags & MS_RDONLY)) {
1204                 status = ocfs2_enable_quotas(osb);
1205                 if (status < 0) {
1206                         /* We have to err-out specially here because
1207                          * s_root is already set */
1208                         mlog_errno(status);
1209                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1210                         wake_up(&osb->osb_mount_event);
1211                         mlog_exit(status);
1212                         return status;
1213                 }
1214         }
1215
1216         ocfs2_complete_quota_recovery(osb);
1217
1218         /* Now we wake up again for processes waiting for quotas */
1219         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1220         wake_up(&osb->osb_mount_event);
1221
1222         /* Start this when the mount is almost sure of being successful */
1223         ocfs2_orphan_scan_start(osb);
1224
1225         mlog_exit(status);
1226         return status;
1227
1228 read_super_error:
1229         brelse(bh);
1230
1231         if (inode)
1232                 iput(inode);
1233
1234         if (osb) {
1235                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1236                 wake_up(&osb->osb_mount_event);
1237                 ocfs2_dismount_volume(sb, 1);
1238         }
1239
1240         mlog_exit(status);
1241         return status;
1242 }
1243
1244 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1245                         int flags,
1246                         const char *dev_name,
1247                         void *data)
1248 {
1249         return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1250 }
1251
1252 static void ocfs2_kill_sb(struct super_block *sb)
1253 {
1254         struct ocfs2_super *osb = OCFS2_SB(sb);
1255
1256         /* Failed mount? */
1257         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1258                 goto out;
1259
1260         /* Prevent further queueing of inode drop events */
1261         spin_lock(&dentry_list_lock);
1262         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1263         spin_unlock(&dentry_list_lock);
1264         /* Wait for work to finish and/or remove it */
1265         cancel_work_sync(&osb->dentry_lock_work);
1266 out:
1267         kill_block_super(sb);
1268 }
1269
1270 static struct file_system_type ocfs2_fs_type = {
1271         .owner          = THIS_MODULE,
1272         .name           = "ocfs2",
1273         .mount          = ocfs2_mount,
1274         .kill_sb        = ocfs2_kill_sb,
1275
1276         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1277         .next           = NULL
1278 };
1279
1280 static int ocfs2_check_set_options(struct super_block *sb,
1281                                    struct mount_options *options)
1282 {
1283         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1284             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1285                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1286                 mlog(ML_ERROR, "User quotas were requested, but this "
1287                      "filesystem does not have the feature enabled.\n");
1288                 return 0;
1289         }
1290         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1291             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1292                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1293                 mlog(ML_ERROR, "Group quotas were requested, but this "
1294                      "filesystem does not have the feature enabled.\n");
1295                 return 0;
1296         }
1297         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1298             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1299                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1300                      "feature is not enabled\n");
1301                 return 0;
1302         }
1303         /* No ACL setting specified? Use XATTR feature... */
1304         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1305                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1306                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1307                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1308                 else
1309                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1310         }
1311         return 1;
1312 }
1313
1314 static int ocfs2_parse_options(struct super_block *sb,
1315                                char *options,
1316                                struct mount_options *mopt,
1317                                int is_remount)
1318 {
1319         int status;
1320         char *p;
1321         u32 tmp;
1322
1323         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1324                    options ? options : "(none)");
1325
1326         mopt->commit_interval = 0;
1327         mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1328         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1329         mopt->slot = OCFS2_INVALID_SLOT;
1330         mopt->localalloc_opt = -1;
1331         mopt->cluster_stack[0] = '\0';
1332         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1333         mopt->dir_resv_level = -1;
1334
1335         if (!options) {
1336                 status = 1;
1337                 goto bail;
1338         }
1339
1340         while ((p = strsep(&options, ",")) != NULL) {
1341                 int token, option;
1342                 substring_t args[MAX_OPT_ARGS];
1343
1344                 if (!*p)
1345                         continue;
1346
1347                 token = match_token(p, tokens, args);
1348                 switch (token) {
1349                 case Opt_hb_local:
1350                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1351                         break;
1352                 case Opt_hb_none:
1353                         mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1354                         break;
1355                 case Opt_hb_global:
1356                         mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1357                         break;
1358                 case Opt_barrier:
1359                         if (match_int(&args[0], &option)) {
1360                                 status = 0;
1361                                 goto bail;
1362                         }
1363                         if (option)
1364                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1365                         else
1366                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1367                         break;
1368                 case Opt_intr:
1369                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1370                         break;
1371                 case Opt_nointr:
1372                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1373                         break;
1374                 case Opt_err_panic:
1375                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1376                         break;
1377                 case Opt_err_ro:
1378                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1379                         break;
1380                 case Opt_data_ordered:
1381                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1382                         break;
1383                 case Opt_data_writeback:
1384                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1385                         break;
1386                 case Opt_user_xattr:
1387                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1388                         break;
1389                 case Opt_nouser_xattr:
1390                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1391                         break;
1392                 case Opt_atime_quantum:
1393                         if (match_int(&args[0], &option)) {
1394                                 status = 0;
1395                                 goto bail;
1396                         }
1397                         if (option >= 0)
1398                                 mopt->atime_quantum = option;
1399                         break;
1400                 case Opt_slot:
1401                         option = 0;
1402                         if (match_int(&args[0], &option)) {
1403                                 status = 0;
1404                                 goto bail;
1405                         }
1406                         if (option)
1407                                 mopt->slot = (s16)option;
1408                         break;
1409                 case Opt_commit:
1410                         option = 0;
1411                         if (match_int(&args[0], &option)) {
1412                                 status = 0;
1413                                 goto bail;
1414                         }
1415                         if (option < 0)
1416                                 return 0;
1417                         if (option == 0)
1418                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1419                         mopt->commit_interval = HZ * option;
1420                         break;
1421                 case Opt_localalloc:
1422                         option = 0;
1423                         if (match_int(&args[0], &option)) {
1424                                 status = 0;
1425                                 goto bail;
1426                         }
1427                         if (option >= 0)
1428                                 mopt->localalloc_opt = option;
1429                         break;
1430                 case Opt_localflocks:
1431                         /*
1432                          * Changing this during remount could race
1433                          * flock() requests, or "unbalance" existing
1434                          * ones (e.g., a lock is taken in one mode but
1435                          * dropped in the other). If users care enough
1436                          * to flip locking modes during remount, we
1437                          * could add a "local" flag to individual
1438                          * flock structures for proper tracking of
1439                          * state.
1440                          */
1441                         if (!is_remount)
1442                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1443                         break;
1444                 case Opt_stack:
1445                         /* Check both that the option we were passed
1446                          * is of the right length and that it is a proper
1447                          * string of the right length.
1448                          */
1449                         if (((args[0].to - args[0].from) !=
1450                              OCFS2_STACK_LABEL_LEN) ||
1451                             (strnlen(args[0].from,
1452                                      OCFS2_STACK_LABEL_LEN) !=
1453                              OCFS2_STACK_LABEL_LEN)) {
1454                                 mlog(ML_ERROR,
1455                                      "Invalid cluster_stack option\n");
1456                                 status = 0;
1457                                 goto bail;
1458                         }
1459                         memcpy(mopt->cluster_stack, args[0].from,
1460                                OCFS2_STACK_LABEL_LEN);
1461                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1462                         break;
1463                 case Opt_inode64:
1464                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1465                         break;
1466                 case Opt_usrquota:
1467                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1468                         break;
1469                 case Opt_grpquota:
1470                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1471                         break;
1472                 case Opt_coherency_buffered:
1473                         mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1474                         break;
1475                 case Opt_coherency_full:
1476                         mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1477                         break;
1478                 case Opt_acl:
1479                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1480                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1481                         break;
1482                 case Opt_noacl:
1483                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1484                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1485                         break;
1486                 case Opt_resv_level:
1487                         if (is_remount)
1488                                 break;
1489                         if (match_int(&args[0], &option)) {
1490                                 status = 0;
1491                                 goto bail;
1492                         }
1493                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1494                             option < OCFS2_MAX_RESV_LEVEL)
1495                                 mopt->resv_level = option;
1496                         break;
1497                 case Opt_dir_resv_level:
1498                         if (is_remount)
1499                                 break;
1500                         if (match_int(&args[0], &option)) {
1501                                 status = 0;
1502                                 goto bail;
1503                         }
1504                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1505                             option < OCFS2_MAX_RESV_LEVEL)
1506                                 mopt->dir_resv_level = option;
1507                         break;
1508                 default:
1509                         mlog(ML_ERROR,
1510                              "Unrecognized mount option \"%s\" "
1511                              "or missing value\n", p);
1512                         status = 0;
1513                         goto bail;
1514                 }
1515         }
1516
1517         /* Ensure only one heartbeat mode */
1518         tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
1519                                  OCFS2_MOUNT_HB_NONE);
1520         if (hweight32(tmp) != 1) {
1521                 mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1522                 status = 0;
1523                 goto bail;
1524         }
1525
1526         status = 1;
1527
1528 bail:
1529         mlog_exit(status);
1530         return status;
1531 }
1532
1533 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1534 {
1535         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1536         unsigned long opts = osb->s_mount_opt;
1537         unsigned int local_alloc_megs;
1538
1539         if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1540                 seq_printf(s, ",_netdev");
1541                 if (opts & OCFS2_MOUNT_HB_LOCAL)
1542                         seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1543                 else
1544                         seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1545         } else
1546                 seq_printf(s, ",%s", OCFS2_HB_NONE);
1547
1548         if (opts & OCFS2_MOUNT_NOINTR)
1549                 seq_printf(s, ",nointr");
1550
1551         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1552                 seq_printf(s, ",data=writeback");
1553         else
1554                 seq_printf(s, ",data=ordered");
1555
1556         if (opts & OCFS2_MOUNT_BARRIER)
1557                 seq_printf(s, ",barrier=1");
1558
1559         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1560                 seq_printf(s, ",errors=panic");
1561         else
1562                 seq_printf(s, ",errors=remount-ro");
1563
1564         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1565                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1566
1567         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1568                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1569
1570         if (osb->osb_commit_interval)
1571                 seq_printf(s, ",commit=%u",
1572                            (unsigned) (osb->osb_commit_interval / HZ));
1573
1574         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1575         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1576                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1577
1578         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1579                 seq_printf(s, ",localflocks,");
1580
1581         if (osb->osb_cluster_stack[0])
1582                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1583                            osb->osb_cluster_stack);
1584         if (opts & OCFS2_MOUNT_USRQUOTA)
1585                 seq_printf(s, ",usrquota");
1586         if (opts & OCFS2_MOUNT_GRPQUOTA)
1587                 seq_printf(s, ",grpquota");
1588
1589         if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1590                 seq_printf(s, ",coherency=buffered");
1591         else
1592                 seq_printf(s, ",coherency=full");
1593
1594         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1595                 seq_printf(s, ",nouser_xattr");
1596         else
1597                 seq_printf(s, ",user_xattr");
1598
1599         if (opts & OCFS2_MOUNT_INODE64)
1600                 seq_printf(s, ",inode64");
1601
1602         if (opts & OCFS2_MOUNT_POSIX_ACL)
1603                 seq_printf(s, ",acl");
1604         else
1605                 seq_printf(s, ",noacl");
1606
1607         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1608                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1609
1610         if (osb->osb_dir_resv_level != osb->osb_resv_level)
1611                 seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1612
1613         return 0;
1614 }
1615
1616 static int __init ocfs2_init(void)
1617 {
1618         int status;
1619
1620         mlog_entry_void();
1621
1622         ocfs2_print_version();
1623
1624         status = init_ocfs2_uptodate_cache();
1625         if (status < 0) {
1626                 mlog_errno(status);
1627                 goto leave;
1628         }
1629
1630         status = ocfs2_initialize_mem_caches();
1631         if (status < 0) {
1632                 mlog_errno(status);
1633                 goto leave;
1634         }
1635
1636         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1637         if (!ocfs2_wq) {
1638                 status = -ENOMEM;
1639                 goto leave;
1640         }
1641
1642         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1643         if (!ocfs2_debugfs_root) {
1644                 status = -EFAULT;
1645                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1646         }
1647
1648         status = ocfs2_quota_setup();
1649         if (status)
1650                 goto leave;
1651
1652         ocfs2_set_locking_protocol();
1653
1654         status = register_quota_format(&ocfs2_quota_format);
1655 leave:
1656         if (status < 0) {
1657                 ocfs2_quota_shutdown();
1658                 ocfs2_free_mem_caches();
1659                 exit_ocfs2_uptodate_cache();
1660         }
1661
1662         mlog_exit(status);
1663
1664         if (status >= 0) {
1665                 return register_filesystem(&ocfs2_fs_type);
1666         } else
1667                 return -1;
1668 }
1669
1670 static void __exit ocfs2_exit(void)
1671 {
1672         mlog_entry_void();
1673
1674         ocfs2_quota_shutdown();
1675
1676         if (ocfs2_wq) {
1677                 flush_workqueue(ocfs2_wq);
1678                 destroy_workqueue(ocfs2_wq);
1679         }
1680
1681         unregister_quota_format(&ocfs2_quota_format);
1682
1683         debugfs_remove(ocfs2_debugfs_root);
1684
1685         ocfs2_free_mem_caches();
1686
1687         unregister_filesystem(&ocfs2_fs_type);
1688
1689         exit_ocfs2_uptodate_cache();
1690
1691         mlog_exit_void();
1692 }
1693
1694 static void ocfs2_put_super(struct super_block *sb)
1695 {
1696         mlog_entry("(0x%p)\n", sb);
1697
1698         ocfs2_sync_blockdev(sb);
1699         ocfs2_dismount_volume(sb, 0);
1700
1701         mlog_exit_void();
1702 }
1703
1704 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1705 {
1706         struct ocfs2_super *osb;
1707         u32 numbits, freebits;
1708         int status;
1709         struct ocfs2_dinode *bm_lock;
1710         struct buffer_head *bh = NULL;
1711         struct inode *inode = NULL;
1712
1713         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1714
1715         osb = OCFS2_SB(dentry->d_sb);
1716
1717         inode = ocfs2_get_system_file_inode(osb,
1718                                             GLOBAL_BITMAP_SYSTEM_INODE,
1719                                             OCFS2_INVALID_SLOT);
1720         if (!inode) {
1721                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1722                 status = -EIO;
1723                 goto bail;
1724         }
1725
1726         status = ocfs2_inode_lock(inode, &bh, 0);
1727         if (status < 0) {
1728                 mlog_errno(status);
1729                 goto bail;
1730         }
1731
1732         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1733
1734         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1735         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1736
1737         buf->f_type = OCFS2_SUPER_MAGIC;
1738         buf->f_bsize = dentry->d_sb->s_blocksize;
1739         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1740         buf->f_blocks = ((sector_t) numbits) *
1741                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1742         buf->f_bfree = ((sector_t) freebits) *
1743                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1744         buf->f_bavail = buf->f_bfree;
1745         buf->f_files = numbits;
1746         buf->f_ffree = freebits;
1747         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1748                                 & 0xFFFFFFFFUL;
1749         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1750                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1751
1752         brelse(bh);
1753
1754         ocfs2_inode_unlock(inode, 0);
1755         status = 0;
1756 bail:
1757         if (inode)
1758                 iput(inode);
1759
1760         mlog_exit(status);
1761
1762         return status;
1763 }
1764
1765 static void ocfs2_inode_init_once(void *data)
1766 {
1767         struct ocfs2_inode_info *oi = data;
1768
1769         oi->ip_flags = 0;
1770         oi->ip_open_count = 0;
1771         spin_lock_init(&oi->ip_lock);
1772         ocfs2_extent_map_init(&oi->vfs_inode);
1773         INIT_LIST_HEAD(&oi->ip_io_markers);
1774         oi->ip_dir_start_lookup = 0;
1775
1776         init_rwsem(&oi->ip_alloc_sem);
1777         init_rwsem(&oi->ip_xattr_sem);
1778         mutex_init(&oi->ip_io_mutex);
1779
1780         oi->ip_blkno = 0ULL;
1781         oi->ip_clusters = 0;
1782
1783         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1784
1785         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1786         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1787         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1788
1789         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1790                                   &ocfs2_inode_caching_ops);
1791
1792         inode_init_once(&oi->vfs_inode);
1793 }
1794
1795 static int ocfs2_initialize_mem_caches(void)
1796 {
1797         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1798                                        sizeof(struct ocfs2_inode_info),
1799                                        0,
1800                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1801                                                 SLAB_MEM_SPREAD),
1802                                        ocfs2_inode_init_once);
1803         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1804                                         sizeof(struct ocfs2_dquot),
1805                                         0,
1806                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1807                                                 SLAB_MEM_SPREAD),
1808                                         NULL);
1809         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1810                                         sizeof(struct ocfs2_quota_chunk),
1811                                         0,
1812                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1813                                         NULL);
1814         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1815             !ocfs2_qf_chunk_cachep) {
1816                 if (ocfs2_inode_cachep)
1817                         kmem_cache_destroy(ocfs2_inode_cachep);
1818                 if (ocfs2_dquot_cachep)
1819                         kmem_cache_destroy(ocfs2_dquot_cachep);
1820                 if (ocfs2_qf_chunk_cachep)
1821                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1822                 return -ENOMEM;
1823         }
1824
1825         return 0;
1826 }
1827
1828 static void ocfs2_free_mem_caches(void)
1829 {
1830         if (ocfs2_inode_cachep)
1831                 kmem_cache_destroy(ocfs2_inode_cachep);
1832         ocfs2_inode_cachep = NULL;
1833
1834         if (ocfs2_dquot_cachep)
1835                 kmem_cache_destroy(ocfs2_dquot_cachep);
1836         ocfs2_dquot_cachep = NULL;
1837
1838         if (ocfs2_qf_chunk_cachep)
1839                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1840         ocfs2_qf_chunk_cachep = NULL;
1841 }
1842
1843 static int ocfs2_get_sector(struct super_block *sb,
1844                             struct buffer_head **bh,
1845                             int block,
1846                             int sect_size)
1847 {
1848         if (!sb_set_blocksize(sb, sect_size)) {
1849                 mlog(ML_ERROR, "unable to set blocksize\n");
1850                 return -EIO;
1851         }
1852
1853         *bh = sb_getblk(sb, block);
1854         if (!*bh) {
1855                 mlog_errno(-EIO);
1856                 return -EIO;
1857         }
1858         lock_buffer(*bh);
1859         if (!buffer_dirty(*bh))
1860                 clear_buffer_uptodate(*bh);
1861         unlock_buffer(*bh);
1862         ll_rw_block(READ, 1, bh);
1863         wait_on_buffer(*bh);
1864         if (!buffer_uptodate(*bh)) {
1865                 mlog_errno(-EIO);
1866                 brelse(*bh);
1867                 *bh = NULL;
1868                 return -EIO;
1869         }
1870
1871         return 0;
1872 }
1873
1874 static int ocfs2_mount_volume(struct super_block *sb)
1875 {
1876         int status = 0;
1877         int unlock_super = 0;
1878         struct ocfs2_super *osb = OCFS2_SB(sb);
1879
1880         mlog_entry_void();
1881
1882         if (ocfs2_is_hard_readonly(osb))
1883                 goto leave;
1884
1885         status = ocfs2_dlm_init(osb);
1886         if (status < 0) {
1887                 mlog_errno(status);
1888                 goto leave;
1889         }
1890
1891         status = ocfs2_super_lock(osb, 1);
1892         if (status < 0) {
1893                 mlog_errno(status);
1894                 goto leave;
1895         }
1896         unlock_super = 1;
1897
1898         /* This will load up the node map and add ourselves to it. */
1899         status = ocfs2_find_slot(osb);
1900         if (status < 0) {
1901                 mlog_errno(status);
1902                 goto leave;
1903         }
1904
1905         /* load all node-local system inodes */
1906         status = ocfs2_init_local_system_inodes(osb);
1907         if (status < 0) {
1908                 mlog_errno(status);
1909                 goto leave;
1910         }
1911
1912         status = ocfs2_check_volume(osb);
1913         if (status < 0) {
1914                 mlog_errno(status);
1915                 goto leave;
1916         }
1917
1918         status = ocfs2_truncate_log_init(osb);
1919         if (status < 0)
1920                 mlog_errno(status);
1921
1922 leave:
1923         if (unlock_super)
1924                 ocfs2_super_unlock(osb, 1);
1925
1926         mlog_exit(status);
1927         return status;
1928 }
1929
1930 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1931 {
1932         int tmp, hangup_needed = 0;
1933         struct ocfs2_super *osb = NULL;
1934         char nodestr[8];
1935
1936         mlog_entry("(0x%p)\n", sb);
1937
1938         BUG_ON(!sb);
1939         osb = OCFS2_SB(sb);
1940         BUG_ON(!osb);
1941
1942         debugfs_remove(osb->osb_ctxt);
1943
1944         /*
1945          * Flush inode dropping work queue so that deletes are
1946          * performed while the filesystem is still working
1947          */
1948         ocfs2_drop_all_dl_inodes(osb);
1949
1950         /* Orphan scan should be stopped as early as possible */
1951         ocfs2_orphan_scan_stop(osb);
1952
1953         ocfs2_disable_quotas(osb);
1954
1955         ocfs2_shutdown_local_alloc(osb);
1956
1957         ocfs2_truncate_log_shutdown(osb);
1958
1959         /* This will disable recovery and flush any recovery work. */
1960         ocfs2_recovery_exit(osb);
1961
1962         ocfs2_journal_shutdown(osb);
1963
1964         ocfs2_sync_blockdev(sb);
1965
1966         ocfs2_purge_refcount_trees(osb);
1967
1968         /* No cluster connection means we've failed during mount, so skip
1969          * all the steps which depended on that to complete. */
1970         if (osb->cconn) {
1971                 tmp = ocfs2_super_lock(osb, 1);
1972                 if (tmp < 0) {
1973                         mlog_errno(tmp);
1974                         return;
1975                 }
1976         }
1977
1978         if (osb->slot_num != OCFS2_INVALID_SLOT)
1979                 ocfs2_put_slot(osb);
1980
1981         if (osb->cconn)
1982                 ocfs2_super_unlock(osb, 1);
1983
1984         ocfs2_release_system_inodes(osb);
1985
1986         /*
1987          * If we're dismounting due to mount error, mount.ocfs2 will clean
1988          * up heartbeat.  If we're a local mount, there is no heartbeat.
1989          * If we failed before we got a uuid_str yet, we can't stop
1990          * heartbeat.  Otherwise, do it.
1991          */
1992         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1993                 hangup_needed = 1;
1994
1995         if (osb->cconn)
1996                 ocfs2_dlm_shutdown(osb, hangup_needed);
1997
1998         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1999         debugfs_remove(osb->osb_debug_root);
2000
2001         if (hangup_needed)
2002                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
2003
2004         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
2005
2006         if (ocfs2_mount_local(osb))
2007                 snprintf(nodestr, sizeof(nodestr), "local");
2008         else
2009                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
2010
2011         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
2012                osb->dev_str, nodestr);
2013
2014         ocfs2_delete_osb(osb);
2015         kfree(osb);
2016         sb->s_dev = 0;
2017         sb->s_fs_info = NULL;
2018 }
2019
2020 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
2021                                 unsigned uuid_bytes)
2022 {
2023         int i, ret;
2024         char *ptr;
2025
2026         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2027
2028         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2029         if (osb->uuid_str == NULL)
2030                 return -ENOMEM;
2031
2032         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2033                 /* print with null */
2034                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
2035                 if (ret != 2) /* drop super cleans up */
2036                         return -EINVAL;
2037                 /* then only advance past the last char */
2038                 ptr += 2;
2039         }
2040
2041         return 0;
2042 }
2043
2044 /* Make sure entire volume is addressable by our journal.  Requires
2045    osb_clusters_at_boot to be valid and for the journal to have been
2046    initialized by ocfs2_journal_init(). */
2047 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2048 {
2049         int status = 0;
2050         u64 max_block =
2051                 ocfs2_clusters_to_blocks(osb->sb,
2052                                          osb->osb_clusters_at_boot) - 1;
2053
2054         /* 32-bit block number is always OK. */
2055         if (max_block <= (u32)~0ULL)
2056                 goto out;
2057
2058         /* Volume is "huge", so see if our journal is new enough to
2059            support it. */
2060         if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2061                                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2062               jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2063                                                JBD2_FEATURE_INCOMPAT_64BIT))) {
2064                 mlog(ML_ERROR, "The journal cannot address the entire volume. "
2065                      "Enable the 'block64' journal option with tunefs.ocfs2");
2066                 status = -EFBIG;
2067                 goto out;
2068         }
2069
2070  out:
2071         return status;
2072 }
2073
2074 static int ocfs2_initialize_super(struct super_block *sb,
2075                                   struct buffer_head *bh,
2076                                   int sector_size,
2077                                   struct ocfs2_blockcheck_stats *stats)
2078 {
2079         int status;
2080         int i, cbits, bbits;
2081         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2082         struct inode *inode = NULL;
2083         struct ocfs2_journal *journal;
2084         __le32 uuid_net_key;
2085         struct ocfs2_super *osb;
2086         u64 total_blocks;
2087
2088         mlog_entry_void();
2089
2090         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2091         if (!osb) {
2092                 status = -ENOMEM;
2093                 mlog_errno(status);
2094                 goto bail;
2095         }
2096
2097         sb->s_fs_info = osb;
2098         sb->s_op = &ocfs2_sops;
2099         sb->s_d_op = &ocfs2_dentry_ops;
2100         sb->s_export_op = &ocfs2_export_ops;
2101         sb->s_qcop = &ocfs2_quotactl_ops;
2102         sb->dq_op = &ocfs2_quota_operations;
2103         sb->s_xattr = ocfs2_xattr_handlers;
2104         sb->s_time_gran = 1;
2105         sb->s_flags |= MS_NOATIME;
2106         /* this is needed to support O_LARGEFILE */
2107         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2108         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2109         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2110
2111         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2112
2113         for (i = 0; i < 3; i++)
2114                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2115         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2116
2117         osb->sb = sb;
2118         /* Save off for ocfs2_rw_direct */
2119         osb->s_sectsize_bits = blksize_bits(sector_size);
2120         BUG_ON(!osb->s_sectsize_bits);
2121
2122         spin_lock_init(&osb->dc_task_lock);
2123         init_waitqueue_head(&osb->dc_event);
2124         osb->dc_work_sequence = 0;
2125         osb->dc_wake_sequence = 0;
2126         INIT_LIST_HEAD(&osb->blocked_lock_list);
2127         osb->blocked_lock_count = 0;
2128         spin_lock_init(&osb->osb_lock);
2129         spin_lock_init(&osb->osb_xattr_lock);
2130         ocfs2_init_steal_slots(osb);
2131
2132         atomic_set(&osb->alloc_stats.moves, 0);
2133         atomic_set(&osb->alloc_stats.local_data, 0);
2134         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2135         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2136         atomic_set(&osb->alloc_stats.bg_extends, 0);
2137
2138         /* Copy the blockcheck stats from the superblock probe */
2139         osb->osb_ecc_stats = *stats;
2140
2141         ocfs2_init_node_maps(osb);
2142
2143         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2144                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2145
2146         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2147         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2148                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2149                      osb->max_slots);
2150                 status = -EINVAL;
2151                 goto bail;
2152         }
2153         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2154
2155         ocfs2_orphan_scan_init(osb);
2156
2157         status = ocfs2_recovery_init(osb);
2158         if (status) {
2159                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2160                 mlog_errno(status);
2161                 goto bail;
2162         }
2163
2164         init_waitqueue_head(&osb->checkpoint_event);
2165         atomic_set(&osb->needs_checkpoint, 0);
2166
2167         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2168
2169         osb->slot_num = OCFS2_INVALID_SLOT;
2170
2171         osb->s_xattr_inline_size = le16_to_cpu(
2172                                         di->id2.i_super.s_xattr_inline_size);
2173
2174         osb->local_alloc_state = OCFS2_LA_UNUSED;
2175         osb->local_alloc_bh = NULL;
2176         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2177
2178         init_waitqueue_head(&osb->osb_mount_event);
2179
2180         status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2181         if (status) {
2182                 mlog_errno(status);
2183                 goto bail;
2184         }
2185
2186         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2187         if (!osb->vol_label) {
2188                 mlog(ML_ERROR, "unable to alloc vol label\n");
2189                 status = -ENOMEM;
2190                 goto bail;
2191         }
2192
2193         osb->slot_recovery_generations =
2194                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2195                         GFP_KERNEL);
2196         if (!osb->slot_recovery_generations) {
2197                 status = -ENOMEM;
2198                 mlog_errno(status);
2199                 goto bail;
2200         }
2201
2202         init_waitqueue_head(&osb->osb_wipe_event);
2203         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2204                                         sizeof(*osb->osb_orphan_wipes),
2205                                         GFP_KERNEL);
2206         if (!osb->osb_orphan_wipes) {
2207                 status = -ENOMEM;
2208                 mlog_errno(status);
2209                 goto bail;
2210         }
2211
2212         osb->osb_rf_lock_tree = RB_ROOT;
2213
2214         osb->s_feature_compat =
2215                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2216         osb->s_feature_ro_compat =
2217                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2218         osb->s_feature_incompat =
2219                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2220
2221         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2222                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2223                      "optional features (%x).\n", i);
2224                 status = -EINVAL;
2225                 goto bail;
2226         }
2227         if (!(osb->sb->s_flags & MS_RDONLY) &&
2228             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2229                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2230                      "unsupported optional features (%x).\n", i);
2231                 status = -EINVAL;
2232                 goto bail;
2233         }
2234
2235         if (ocfs2_clusterinfo_valid(osb)) {
2236                 osb->osb_stackflags =
2237                         OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2238                 memcpy(osb->osb_cluster_stack,
2239                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2240                        OCFS2_STACK_LABEL_LEN);
2241                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2242                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2243                         mlog(ML_ERROR,
2244                              "couldn't mount because of an invalid "
2245                              "cluster stack label (%s) \n",
2246                              osb->osb_cluster_stack);
2247                         status = -EINVAL;
2248                         goto bail;
2249                 }
2250         } else {
2251                 /* The empty string is identical with classic tools that
2252                  * don't know about s_cluster_info. */
2253                 osb->osb_cluster_stack[0] = '\0';
2254         }
2255
2256         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2257
2258         /* FIXME
2259          * This should be done in ocfs2_journal_init(), but unknown
2260          * ordering issues will cause the filesystem to crash.
2261          * If anyone wants to figure out what part of the code
2262          * refers to osb->journal before ocfs2_journal_init() is run,
2263          * be my guest.
2264          */
2265         /* initialize our journal structure */
2266
2267         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2268         if (!journal) {
2269                 mlog(ML_ERROR, "unable to alloc journal\n");
2270                 status = -ENOMEM;
2271                 goto bail;
2272         }
2273         osb->journal = journal;
2274         journal->j_osb = osb;
2275
2276         atomic_set(&journal->j_num_trans, 0);
2277         init_rwsem(&journal->j_trans_barrier);
2278         init_waitqueue_head(&journal->j_checkpointed);
2279         spin_lock_init(&journal->j_lock);
2280         journal->j_trans_id = (unsigned long) 1;
2281         INIT_LIST_HEAD(&journal->j_la_cleanups);
2282         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2283         journal->j_state = OCFS2_JOURNAL_FREE;
2284
2285         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2286         osb->dentry_lock_list = NULL;
2287
2288         /* get some pseudo constants for clustersize bits */
2289         osb->s_clustersize_bits =
2290                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2291         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2292         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2293
2294         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2295             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2296                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2297                      osb->s_clustersize);
2298                 status = -EINVAL;
2299                 goto bail;
2300         }
2301
2302         total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2303                                                 le32_to_cpu(di->i_clusters));
2304
2305         status = generic_check_addressable(osb->sb->s_blocksize_bits,
2306                                            total_blocks);
2307         if (status) {
2308                 mlog(ML_ERROR, "Volume too large "
2309                      "to mount safely on this system");
2310                 status = -EFBIG;
2311                 goto bail;
2312         }
2313
2314         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2315                                  sizeof(di->id2.i_super.s_uuid))) {
2316                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2317                 status = -ENOMEM;
2318                 goto bail;
2319         }
2320
2321         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2322
2323         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2324         osb->vol_label[63] = '\0';
2325         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2326         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2327         osb->first_cluster_group_blkno =
2328                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2329         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2330         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2331         mlog(0, "vol_label: %s\n", osb->vol_label);
2332         mlog(0, "uuid: %s\n", osb->uuid_str);
2333         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2334              (unsigned long long)osb->root_blkno,
2335              (unsigned long long)osb->system_dir_blkno);
2336
2337         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2338         if (!osb->osb_dlm_debug) {
2339                 status = -ENOMEM;
2340                 mlog_errno(status);
2341                 goto bail;
2342         }
2343
2344         atomic_set(&osb->vol_state, VOLUME_INIT);
2345
2346         /* load root, system_dir, and all global system inodes */
2347         status = ocfs2_init_global_system_inodes(osb);
2348         if (status < 0) {
2349                 mlog_errno(status);
2350                 goto bail;
2351         }
2352
2353         /*
2354          * global bitmap
2355          */
2356         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2357                                             OCFS2_INVALID_SLOT);
2358         if (!inode) {
2359                 status = -EINVAL;
2360                 mlog_errno(status);
2361                 goto bail;
2362         }
2363
2364         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2365         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2366         iput(inode);
2367
2368         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2369                                  osb->s_feature_incompat) * 8;
2370
2371         status = ocfs2_init_slot_info(osb);
2372         if (status < 0) {
2373                 mlog_errno(status);
2374                 goto bail;
2375         }
2376
2377 bail:
2378         mlog_exit(status);
2379         return status;
2380 }
2381
2382 /*
2383  * will return: -EAGAIN if it is ok to keep searching for superblocks
2384  *              -EINVAL if there is a bad superblock
2385  *              0 on success
2386  */
2387 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2388                                struct buffer_head *bh,
2389                                u32 blksz,
2390                                struct ocfs2_blockcheck_stats *stats)
2391 {
2392         int status = -EAGAIN;
2393
2394         mlog_entry_void();
2395
2396         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2397                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2398                 /* We have to do a raw check of the feature here */
2399                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2400                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2401                         status = ocfs2_block_check_validate(bh->b_data,
2402                                                             bh->b_size,
2403                                                             &di->i_check,
2404                                                             stats);
2405                         if (status)
2406                                 goto out;
2407                 }
2408                 status = -EINVAL;
2409                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2410                         mlog(ML_ERROR, "found superblock with incorrect block "
2411                              "size: found %u, should be %u\n",
2412                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2413                                blksz);
2414                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2415                            OCFS2_MAJOR_REV_LEVEL ||
2416                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2417                            OCFS2_MINOR_REV_LEVEL) {
2418                         mlog(ML_ERROR, "found superblock with bad version: "
2419                              "found %u.%u, should be %u.%u\n",
2420                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2421                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2422                              OCFS2_MAJOR_REV_LEVEL,
2423                              OCFS2_MINOR_REV_LEVEL);
2424                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2425                         mlog(ML_ERROR, "bad block number on superblock: "
2426                              "found %llu, should be %llu\n",
2427                              (unsigned long long)le64_to_cpu(di->i_blkno),
2428                              (unsigned long long)bh->b_blocknr);
2429                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2430                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2431                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2432                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2433                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2434                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2435                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2436                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2437                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2438                         mlog(ML_ERROR,
2439                              "Superblock slots found greater than file system "
2440                              "maximum: found %u, max %u\n",
2441                              le16_to_cpu(di->id2.i_super.s_max_slots),
2442                              OCFS2_MAX_SLOTS);
2443                 } else {
2444                         /* found it! */
2445                         status = 0;
2446                 }
2447         }
2448
2449 out:
2450         mlog_exit(status);
2451         return status;
2452 }
2453
2454 static int ocfs2_check_volume(struct ocfs2_super *osb)
2455 {
2456         int status;
2457         int dirty;
2458         int local;
2459         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2460                                                   * recover
2461                                                   * ourselves. */
2462
2463         mlog_entry_void();
2464
2465         /* Init our journal object. */
2466         status = ocfs2_journal_init(osb->journal, &dirty);
2467         if (status < 0) {
2468                 mlog(ML_ERROR, "Could not initialize journal!\n");
2469                 goto finally;
2470         }
2471
2472         /* Now that journal has been initialized, check to make sure
2473            entire volume is addressable. */
2474         status = ocfs2_journal_addressable(osb);
2475         if (status)
2476                 goto finally;
2477
2478         /* If the journal was unmounted cleanly then we don't want to
2479          * recover anything. Otherwise, journal_load will do that
2480          * dirty work for us :) */
2481         if (!dirty) {
2482                 status = ocfs2_journal_wipe(osb->journal, 0);
2483                 if (status < 0) {
2484                         mlog_errno(status);
2485                         goto finally;
2486                 }
2487         } else {
2488                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2489                      "recovering volume.\n");
2490         }
2491
2492         local = ocfs2_mount_local(osb);
2493
2494         /* will play back anything left in the journal. */
2495         status = ocfs2_journal_load(osb->journal, local, dirty);
2496         if (status < 0) {
2497                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2498                 goto finally;
2499         }
2500
2501         if (dirty) {
2502                 /* recover my local alloc if we didn't unmount cleanly. */
2503                 status = ocfs2_begin_local_alloc_recovery(osb,
2504                                                           osb->slot_num,
2505                                                           &local_alloc);
2506                 if (status < 0) {
2507                         mlog_errno(status);
2508                         goto finally;
2509                 }
2510                 /* we complete the recovery process after we've marked
2511                  * ourselves as mounted. */
2512         }
2513
2514         mlog(0, "Journal loaded.\n");
2515
2516         status = ocfs2_load_local_alloc(osb);
2517         if (status < 0) {
2518                 mlog_errno(status);
2519                 goto finally;
2520         }
2521
2522         if (dirty) {
2523                 /* Recovery will be completed after we've mounted the
2524                  * rest of the volume. */
2525                 osb->dirty = 1;
2526                 osb->local_alloc_copy = local_alloc;
2527                 local_alloc = NULL;
2528         }
2529
2530         /* go through each journal, trylock it and if you get the
2531          * lock, and it's marked as dirty, set the bit in the recover
2532          * map and launch a recovery thread for it. */
2533         status = ocfs2_mark_dead_nodes(osb);
2534         if (status < 0) {
2535                 mlog_errno(status);
2536                 goto finally;
2537         }
2538
2539         status = ocfs2_compute_replay_slots(osb);
2540         if (status < 0)
2541                 mlog_errno(status);
2542
2543 finally:
2544         if (local_alloc)
2545                 kfree(local_alloc);
2546
2547         mlog_exit(status);
2548         return status;
2549 }
2550
2551 /*
2552  * The routine gets called from dismount or close whenever a dismount on
2553  * volume is requested and the osb open count becomes 1.
2554  * It will remove the osb from the global list and also free up all the
2555  * initialized resources and fileobject.
2556  */
2557 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2558 {
2559         mlog_entry_void();
2560
2561         /* This function assumes that the caller has the main osb resource */
2562
2563         ocfs2_free_slot_info(osb);
2564
2565         kfree(osb->osb_orphan_wipes);
2566         kfree(osb->slot_recovery_generations);
2567         /* FIXME
2568          * This belongs in journal shutdown, but because we have to
2569          * allocate osb->journal at the start of ocfs2_initialize_osb(),
2570          * we free it here.
2571          */
2572         kfree(osb->journal);
2573         if (osb->local_alloc_copy)
2574                 kfree(osb->local_alloc_copy);
2575         kfree(osb->uuid_str);
2576         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2577         memset(osb, 0, sizeof(struct ocfs2_super));
2578
2579         mlog_exit_void();
2580 }
2581
2582 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2583  * panic(). We do not support continue-on-error operation. */
2584 static void ocfs2_handle_error(struct super_block *sb)
2585 {
2586         struct ocfs2_super *osb = OCFS2_SB(sb);
2587
2588         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2589                 panic("OCFS2: (device %s): panic forced after error\n",
2590                       sb->s_id);
2591
2592         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2593
2594         if (sb->s_flags & MS_RDONLY &&
2595             (ocfs2_is_soft_readonly(osb) ||
2596              ocfs2_is_hard_readonly(osb)))
2597                 return;
2598
2599         printk(KERN_CRIT "File system is now read-only due to the potential "
2600                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2601                "system is unmounted.\n");
2602         sb->s_flags |= MS_RDONLY;
2603         ocfs2_set_ro_flag(osb, 0);
2604 }
2605
2606 static char error_buf[1024];
2607
2608 void __ocfs2_error(struct super_block *sb,
2609                    const char *function,
2610                    const char *fmt, ...)
2611 {
2612         va_list args;
2613
2614         va_start(args, fmt);
2615         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2616         va_end(args);
2617
2618         /* Not using mlog here because we want to show the actual
2619          * function the error came from. */
2620         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2621                sb->s_id, function, error_buf);
2622
2623         ocfs2_handle_error(sb);
2624 }
2625
2626 /* Handle critical errors. This is intentionally more drastic than
2627  * ocfs2_handle_error, so we only use for things like journal errors,
2628  * etc. */
2629 void __ocfs2_abort(struct super_block* sb,
2630                    const char *function,
2631                    const char *fmt, ...)
2632 {
2633         va_list args;
2634
2635         va_start(args, fmt);
2636         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2637         va_end(args);
2638
2639         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2640                sb->s_id, function, error_buf);
2641
2642         /* We don't have the cluster support yet to go straight to
2643          * hard readonly in here. Until then, we want to keep
2644          * ocfs2_abort() so that we can at least mark critical
2645          * errors.
2646          *
2647          * TODO: This should abort the journal and alert other nodes
2648          * that our slot needs recovery. */
2649
2650         /* Force a panic(). This stinks, but it's better than letting
2651          * things continue without having a proper hard readonly
2652          * here. */
2653         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2654                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2655         ocfs2_handle_error(sb);
2656 }
2657
2658 /*
2659  * Void signal blockers, because in-kernel sigprocmask() only fails
2660  * when SIG_* is wrong.
2661  */
2662 void ocfs2_block_signals(sigset_t *oldset)
2663 {
2664         int rc;
2665         sigset_t blocked;
2666
2667         sigfillset(&blocked);
2668         rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2669         BUG_ON(rc);
2670 }
2671
2672 void ocfs2_unblock_signals(sigset_t *oldset)
2673 {
2674         int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2675         BUG_ON(rc);
2676 }
2677
2678 module_init(ocfs2_init);
2679 module_exit(ocfs2_exit);