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

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/utsname.h>
  32 #include <linux/init.h>
  33 #include <linux/random.h>
  34 #include <linux/statfs.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/socket.h>
  38 #include <linux/inet.h>
  39 #include <linux/parser.h>
  40 #include <linux/crc32.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/mount.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/quotaops.h>
  45 #include <linux/smp_lock.h>
  46
  47 #define MLOG_MASK_PREFIX ML_SUPER
  48 #include <cluster/masklog.h>
  49
  50 #include "ocfs2.h"
  51
  52 /* this should be the only file to include a version 1 header */
  53 #include "ocfs1_fs_compat.h"
  54
  55 #include "alloc.h"
  56 #include "blockcheck.h"
  57 #include "dlmglue.h"
  58 #include "export.h"
  59 #include "extent_map.h"
  60 #include "heartbeat.h"
  61 #include "inode.h"
  62 #include "journal.h"
  63 #include "localalloc.h"
  64 #include "namei.h"
  65 #include "slot_map.h"
  66 #include "super.h"
  67 #include "sysfile.h"
  68 #include "uptodate.h"
  69 #include "ver.h"
  70 #include "xattr.h"
  71 #include "quota.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         unsigned int    localalloc_opt;
  97         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  98 };
  99
 100 static int ocfs2_parse_options(struct super_block *sb, char *options,
 101                                struct mount_options *mopt,
 102                                int is_remount);
 103 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 104 static void ocfs2_put_super(struct super_block *sb);
 105 static int ocfs2_mount_volume(struct super_block *sb);
 106 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 107 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 108 static int ocfs2_initialize_mem_caches(void);
 109 static void ocfs2_free_mem_caches(void);
 110 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 111
 112 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 113
 114 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 115
 116 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 117 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 118 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 119 static int ocfs2_check_volume(struct ocfs2_super *osb);
 120 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 121                                struct buffer_head *bh,
 122                                u32 sectsize,
 123                                struct ocfs2_blockcheck_stats *stats);
 124 static int ocfs2_initialize_super(struct super_block *sb,
 125                                   struct buffer_head *bh,
 126                                   int sector_size,
 127                                   struct ocfs2_blockcheck_stats *stats);
 128 static int ocfs2_get_sector(struct super_block *sb,
 129                             struct buffer_head **bh,
 130                             int block,
 131                             int sect_size);
 132 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 133 static void ocfs2_destroy_inode(struct inode *inode);
 134 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 135 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 136 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 137
 138 static const struct super_operations ocfs2_sops = {
 139         .statfs         = ocfs2_statfs,
 140         .alloc_inode    = ocfs2_alloc_inode,
 141         .destroy_inode  = ocfs2_destroy_inode,
 142         .drop_inode     = ocfs2_drop_inode,
 143         .clear_inode    = ocfs2_clear_inode,
 144         .delete_inode   = ocfs2_delete_inode,
 145         .sync_fs        = ocfs2_sync_fs,
 146         .put_super      = ocfs2_put_super,
 147         .remount_fs     = ocfs2_remount,
 148         .show_options   = ocfs2_show_options,
 149         .quota_read     = ocfs2_quota_read,
 150         .quota_write    = ocfs2_quota_write,
 151 };
 152
 153 enum {
 154         Opt_barrier,
 155         Opt_err_panic,
 156         Opt_err_ro,
 157         Opt_intr,
 158         Opt_nointr,
 159         Opt_hb_none,
 160         Opt_hb_local,
 161         Opt_data_ordered,
 162         Opt_data_writeback,
 163         Opt_atime_quantum,
 164         Opt_slot,
 165         Opt_commit,
 166         Opt_localalloc,
 167         Opt_localflocks,
 168         Opt_stack,
 169         Opt_user_xattr,
 170         Opt_nouser_xattr,
 171         Opt_inode64,
 172         Opt_acl,
 173         Opt_noacl,
 174         Opt_usrquota,
 175         Opt_grpquota,
 176         Opt_err,
 177 };
 178
 179 static const match_table_t tokens = {
 180         {Opt_barrier, "barrier=%u"},
 181         {Opt_err_panic, "errors=panic"},
 182         {Opt_err_ro, "errors=remount-ro"},
 183         {Opt_intr, "intr"},
 184         {Opt_nointr, "nointr"},
 185         {Opt_hb_none, OCFS2_HB_NONE},
 186         {Opt_hb_local, OCFS2_HB_LOCAL},
 187         {Opt_data_ordered, "data=ordered"},
 188         {Opt_data_writeback, "data=writeback"},
 189         {Opt_atime_quantum, "atime_quantum=%u"},
 190         {Opt_slot, "preferred_slot=%u"},
 191         {Opt_commit, "commit=%u"},
 192         {Opt_localalloc, "localalloc=%d"},
 193         {Opt_localflocks, "localflocks"},
 194         {Opt_stack, "cluster_stack=%s"},
 195         {Opt_user_xattr, "user_xattr"},
 196         {Opt_nouser_xattr, "nouser_xattr"},
 197         {Opt_inode64, "inode64"},
 198         {Opt_acl, "acl"},
 199         {Opt_noacl, "noacl"},
 200         {Opt_usrquota, "usrquota"},
 201         {Opt_grpquota, "grpquota"},
 202         {Opt_err, NULL}
 203 };
 204
 205 #ifdef CONFIG_DEBUG_FS
 206 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 207 {
 208         int out = 0;
 209         int i;
 210         struct ocfs2_cluster_connection *cconn = osb->cconn;
 211         struct ocfs2_recovery_map *rm = osb->recovery_map;
 212         struct ocfs2_orphan_scan *os;
 213
 214         out += snprintf(buf + out, len - out,
 215                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 216                         "Device", osb->dev_str, osb->uuid_str,
 217                         osb->fs_generation, osb->vol_label);
 218
 219         out += snprintf(buf + out, len - out,
 220                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 221                         atomic_read(&osb->vol_state), osb->osb_flags);
 222
 223         out += snprintf(buf + out, len - out,
 224                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 225                         osb->sb->s_blocksize, osb->s_clustersize);
 226
 227         out += snprintf(buf + out, len - out,
 228                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 229                         "ROcompat: 0x%X\n",
 230                         "Features", osb->s_feature_compat,
 231                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 232
 233         out += snprintf(buf + out, len - out,
 234                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 235                         osb->s_mount_opt, osb->s_atime_quantum);
 236
 237         out += snprintf(buf + out, len - out,
 238                         "%10s => Stack: %s  Name: %*s  Version: %d.%d\n",
 239                         "Cluster",
 240                         (*osb->osb_cluster_stack == '\0' ?
 241                          "o2cb" : osb->osb_cluster_stack),
 242                         cconn->cc_namelen, cconn->cc_name,
 243                         cconn->cc_version.pv_major, cconn->cc_version.pv_minor);
 244
 245         spin_lock(&osb->dc_task_lock);
 246         out += snprintf(buf + out, len - out,
 247                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 248                         "WorkSeq: %lu\n", "DownCnvt",
 249                         task_pid_nr(osb->dc_task), osb->blocked_lock_count,
 250                         osb->dc_wake_sequence, osb->dc_work_sequence);
 251         spin_unlock(&osb->dc_task_lock);
 252
 253         spin_lock(&osb->osb_lock);
 254         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 255                         "Recovery",
 256                         (osb->recovery_thread_task ?
 257                          task_pid_nr(osb->recovery_thread_task) : -1));
 258         if (rm->rm_used == 0)
 259                 out += snprintf(buf + out, len - out, " None\n");
 260         else {
 261                 for (i = 0; i < rm->rm_used; i++)
 262                         out += snprintf(buf + out, len - out, " %d",
 263                                         rm->rm_entries[i]);
 264                 out += snprintf(buf + out, len - out, "\n");
 265         }
 266         spin_unlock(&osb->osb_lock);
 267
 268         out += snprintf(buf + out, len - out,
 269                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 270                         task_pid_nr(osb->commit_task), osb->osb_commit_interval,
 271                         atomic_read(&osb->needs_checkpoint));
 272
 273         out += snprintf(buf + out, len - out,
 274                         "%10s => State: %d  NumTxns: %d  TxnId: %lu\n",
 275                         "Journal", osb->journal->j_state,
 276                         atomic_read(&osb->journal->j_num_trans),
 277                         osb->journal->j_trans_id);
 278
 279         out += snprintf(buf + out, len - out,
 280                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 281                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 282                         "Stats",
 283                         atomic_read(&osb->alloc_stats.bitmap_data),
 284                         atomic_read(&osb->alloc_stats.local_data),
 285                         atomic_read(&osb->alloc_stats.bg_allocs),
 286                         atomic_read(&osb->alloc_stats.moves),
 287                         atomic_read(&osb->alloc_stats.bg_extends));
 288
 289         out += snprintf(buf + out, len - out,
 290                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 291                         "Default: %u bits\n",
 292                         "LocalAlloc", osb->local_alloc_state,
 293                         (unsigned long long)osb->la_last_gd,
 294                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 295
 296         spin_lock(&osb->osb_lock);
 297         out += snprintf(buf + out, len - out,
 298                         "%10s => Slot: %d  NumStolen: %d\n", "Steal",
 299                         osb->s_inode_steal_slot,
 300                         atomic_read(&osb->s_num_inodes_stolen));
 301         spin_unlock(&osb->osb_lock);
 302
 303         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 304                         "Slots", "Num", "RecoGen");
 305
 306         for (i = 0; i < osb->max_slots; ++i) {
 307                 out += snprintf(buf + out, len - out,
 308                                 "%10s  %c %3d  %10d\n",
 309                                 " ",
 310                                 (i == osb->slot_num ? '*' : ' '),
 311                                 i, osb->slot_recovery_generations[i]);
 312         }
 313
 314         os = &osb->osb_orphan_scan;
 315         out += snprintf(buf + out, len - out, "Orphan Scan=> ");
 316         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 317                         os->os_count, os->os_seqno);
 318         out += snprintf(buf + out, len - out, " Last Scan: %lu seconds ago\n",
 319                         (get_seconds() - os->os_scantime.tv_sec));
 320
 321         return out;
 322 }
 323
 324 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 325 {
 326         struct ocfs2_super *osb = inode->i_private;
 327         char *buf = NULL;
 328
 329         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 330         if (!buf)
 331                 goto bail;
 332
 333         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 334
 335         file->private_data = buf;
 336
 337         return 0;
 338 bail:
 339         return -ENOMEM;
 340 }
 341
 342 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 343 {
 344         kfree(file->private_data);
 345         return 0;
 346 }
 347
 348 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 349                                 size_t nbytes, loff_t *ppos)
 350 {
 351         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 352                                        i_size_read(file->f_mapping->host));
 353 }
 354 #else
 355 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 356 {
 357         return 0;
 358 }
 359 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 360 {
 361         return 0;
 362 }
 363 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 364                                 size_t nbytes, loff_t *ppos)
 365 {
 366         return 0;
 367 }
 368 #endif  /* CONFIG_DEBUG_FS */
 369
 370 static struct file_operations ocfs2_osb_debug_fops = {
 371         .open =         ocfs2_osb_debug_open,
 372         .release =      ocfs2_debug_release,
 373         .read =         ocfs2_debug_read,
 374         .llseek =       generic_file_llseek,
 375 };
 376
 377 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 378 {
 379         int status;
 380         tid_t target;
 381         struct ocfs2_super *osb = OCFS2_SB(sb);
 382
 383         if (ocfs2_is_hard_readonly(osb))
 384                 return -EROFS;
 385
 386         if (wait) {
 387                 status = ocfs2_flush_truncate_log(osb);
 388                 if (status < 0)
 389                         mlog_errno(status);
 390         } else {
 391                 ocfs2_schedule_truncate_log_flush(osb, 0);
 392         }
 393
 394         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 395                                       &target)) {
 396                 if (wait)
 397                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 398                                              target);
 399         }
 400         return 0;
 401 }
 402
 403 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 404 {
 405         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 406             && (ino == USER_QUOTA_SYSTEM_INODE
 407                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 408                 return 0;
 409         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 410             && (ino == GROUP_QUOTA_SYSTEM_INODE
 411                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 412                 return 0;
 413         return 1;
 414 }
 415
 416 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 417 {
 418         struct inode *new = NULL;
 419         int status = 0;
 420         int i;
 421
 422         mlog_entry_void();
 423
 424         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 425         if (IS_ERR(new)) {
 426                 status = PTR_ERR(new);
 427                 mlog_errno(status);
 428                 goto bail;
 429         }
 430         osb->root_inode = new;
 431
 432         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 433         if (IS_ERR(new)) {
 434                 status = PTR_ERR(new);
 435                 mlog_errno(status);
 436                 goto bail;
 437         }
 438         osb->sys_root_inode = new;
 439
 440         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 441              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 442                 if (!ocfs2_need_system_inode(osb, i))
 443                         continue;
 444                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 445                 if (!new) {
 446                         ocfs2_release_system_inodes(osb);
 447                         status = -EINVAL;
 448                         mlog_errno(status);
 449                         /* FIXME: Should ERROR_RO_FS */
 450                         mlog(ML_ERROR, "Unable to load system inode %d, "
 451                              "possibly corrupt fs?", i);
 452                         goto bail;
 453                 }
 454                 // the array now has one ref, so drop this one
 455                 iput(new);
 456         }
 457
 458 bail:
 459         mlog_exit(status);
 460         return status;
 461 }
 462
 463 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 464 {
 465         struct inode *new = NULL;
 466         int status = 0;
 467         int i;
 468
 469         mlog_entry_void();
 470
 471         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 472              i < NUM_SYSTEM_INODES;
 473              i++) {
 474                 if (!ocfs2_need_system_inode(osb, i))
 475                         continue;
 476                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 477                 if (!new) {
 478                         ocfs2_release_system_inodes(osb);
 479                         status = -EINVAL;
 480                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 481                              status, i, osb->slot_num);
 482                         goto bail;
 483                 }
 484                 /* the array now has one ref, so drop this one */
 485                 iput(new);
 486         }
 487
 488 bail:
 489         mlog_exit(status);
 490         return status;
 491 }
 492
 493 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 494 {
 495         int i;
 496         struct inode *inode;
 497
 498         mlog_entry_void();
 499
 500         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 501                 inode = osb->system_inodes[i];
 502                 if (inode) {
 503                         iput(inode);
 504                         osb->system_inodes[i] = NULL;
 505                 }
 506         }
 507
 508         inode = osb->sys_root_inode;
 509         if (inode) {
 510                 iput(inode);
 511                 osb->sys_root_inode = NULL;
 512         }
 513
 514         inode = osb->root_inode;
 515         if (inode) {
 516                 iput(inode);
 517                 osb->root_inode = NULL;
 518         }
 519
 520         mlog_exit(0);
 521 }
 522
 523 /* We're allocating fs objects, use GFP_NOFS */
 524 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 525 {
 526         struct ocfs2_inode_info *oi;
 527
 528         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 529         if (!oi)
 530                 return NULL;
 531
 532         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 533         return &oi->vfs_inode;
 534 }
 535
 536 static void ocfs2_destroy_inode(struct inode *inode)
 537 {
 538         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 539 }
 540
 541 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 542                                                 unsigned int cbits)
 543 {
 544         unsigned int bytes = 1 << cbits;
 545         unsigned int trim = bytes;
 546         unsigned int bitshift = 32;
 547
 548         /*
 549          * i_size and all block offsets in ocfs2 are always 64 bits
 550          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 551          * 64 bit platforms, cluster size will be the limiting factor.
 552          */
 553
 554 #if BITS_PER_LONG == 32
 555 # if defined(CONFIG_LBDAF)
 556         BUILD_BUG_ON(sizeof(sector_t) != 8);
 557         /*
 558          * We might be limited by page cache size.
 559          */
 560         if (bytes > PAGE_CACHE_SIZE) {
 561                 bytes = PAGE_CACHE_SIZE;
 562                 trim = 1;
 563                 /*
 564                  * Shift by 31 here so that we don't get larger than
 565                  * MAX_LFS_FILESIZE
 566                  */
 567                 bitshift = 31;
 568         }
 569 # else
 570         /*
 571          * We are limited by the size of sector_t. Use block size, as
 572          * that's what we expose to the VFS.
 573          */
 574         bytes = 1 << bbits;
 575         trim = 1;
 576         bitshift = 31;
 577 # endif
 578 #endif
 579
 580         /*
 581          * Trim by a whole cluster when we can actually approach the
 582          * on-disk limits. Otherwise we can overflow i_clusters when
 583          * an extent start is at the max offset.
 584          */
 585         return (((unsigned long long)bytes) << bitshift) - trim;
 586 }
 587
 588 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 589 {
 590         int incompat_features;
 591         int ret = 0;
 592         struct mount_options parsed_options;
 593         struct ocfs2_super *osb = OCFS2_SB(sb);
 594
 595         lock_kernel();
 596
 597         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 598                 ret = -EINVAL;
 599                 goto out;
 600         }
 601
 602         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 603             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 604                 ret = -EINVAL;
 605                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 606                 goto out;
 607         }
 608
 609         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 610             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 611                 ret = -EINVAL;
 612                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 613                 goto out;
 614         }
 615
 616         /* Probably don't want this on remount; it might
 617          * mess with other nodes */
 618         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 619             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 620                 ret = -EINVAL;
 621                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 622                 goto out;
 623         }
 624
 625         /* We're going to/from readonly mode. */
 626         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 627                 /* Disable quota accounting before remounting RO */
 628                 if (*flags & MS_RDONLY) {
 629                         ret = ocfs2_susp_quotas(osb, 0);
 630                         if (ret < 0)
 631                                 goto out;
 632                 }
 633                 /* Lock here so the check of HARD_RO and the potential
 634                  * setting of SOFT_RO is atomic. */
 635                 spin_lock(&osb->osb_lock);
 636                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 637                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 638                         ret = -EROFS;
 639                         goto unlock_osb;
 640                 }
 641
 642                 if (*flags & MS_RDONLY) {
 643                         mlog(0, "Going to ro mode.\n");
 644                         sb->s_flags |= MS_RDONLY;
 645                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 646                 } else {
 647                         mlog(0, "Making ro filesystem writeable.\n");
 648
 649                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 650                                 mlog(ML_ERROR, "Cannot remount RDWR "
 651                                      "filesystem due to previous errors.\n");
 652                                 ret = -EROFS;
 653                                 goto unlock_osb;
 654                         }
 655                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 656                         if (incompat_features) {
 657                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 658                                      "of unsupported optional features "
 659                                      "(%x).\n", incompat_features);
 660                                 ret = -EINVAL;
 661                                 goto unlock_osb;
 662                         }
 663                         sb->s_flags &= ~MS_RDONLY;
 664                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 665                 }
 666 unlock_osb:
 667                 spin_unlock(&osb->osb_lock);
 668                 /* Enable quota accounting after remounting RW */
 669                 if (!ret && !(*flags & MS_RDONLY)) {
 670                         if (sb_any_quota_suspended(sb))
 671                                 ret = ocfs2_susp_quotas(osb, 1);
 672                         else
 673                                 ret = ocfs2_enable_quotas(osb);
 674                         if (ret < 0) {
 675                                 /* Return back changes... */
 676                                 spin_lock(&osb->osb_lock);
 677                                 sb->s_flags |= MS_RDONLY;
 678                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 679                                 spin_unlock(&osb->osb_lock);
 680                                 goto out;
 681                         }
 682                 }
 683         }
 684
 685         if (!ret) {
 686                 /* Only save off the new mount options in case of a successful
 687                  * remount. */
 688                 if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 689                         parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 690                 osb->s_mount_opt = parsed_options.mount_opt;
 691                 osb->s_atime_quantum = parsed_options.atime_quantum;
 692                 osb->preferred_slot = parsed_options.slot;
 693                 if (parsed_options.commit_interval)
 694                         osb->osb_commit_interval = parsed_options.commit_interval;
 695
 696                 if (!ocfs2_is_hard_readonly(osb))
 697                         ocfs2_set_journal_params(osb);
 698         }
 699 out:
 700         unlock_kernel();
 701         return ret;
 702 }
 703
 704 static int ocfs2_sb_probe(struct super_block *sb,
 705                           struct buffer_head **bh,
 706                           int *sector_size,
 707                           struct ocfs2_blockcheck_stats *stats)
 708 {
 709         int status, tmpstat;
 710         struct ocfs1_vol_disk_hdr *hdr;
 711         struct ocfs2_dinode *di;
 712         int blksize;
 713
 714         *bh = NULL;
 715
 716         /* may be > 512 */
 717         *sector_size = bdev_logical_block_size(sb->s_bdev);
 718         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 719                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 720                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 721                 status = -EINVAL;
 722                 goto bail;
 723         }
 724
 725         /* Can this really happen? */
 726         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 727                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 728
 729         /* check block zero for old format */
 730         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 731         if (status < 0) {
 732                 mlog_errno(status);
 733                 goto bail;
 734         }
 735         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 736         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 737                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 738                      hdr->major_version, hdr->minor_version);
 739                 status = -EINVAL;
 740         }
 741         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 742                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 743                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 744                      hdr->signature);
 745                 status = -EINVAL;
 746         }
 747         brelse(*bh);
 748         *bh = NULL;
 749         if (status < 0) {
 750                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 751                      "upgraded before mounting with ocfs v2\n");
 752                 goto bail;
 753         }
 754
 755         /*
 756          * Now check at magic offset for 512, 1024, 2048, 4096
 757          * blocksizes.  4096 is the maximum blocksize because it is
 758          * the minimum clustersize.
 759          */
 760         status = -EINVAL;
 761         for (blksize = *sector_size;
 762              blksize <= OCFS2_MAX_BLOCKSIZE;
 763              blksize <<= 1) {
 764                 tmpstat = ocfs2_get_sector(sb, bh,
 765                                            OCFS2_SUPER_BLOCK_BLKNO,
 766                                            blksize);
 767                 if (tmpstat < 0) {
 768                         status = tmpstat;
 769                         mlog_errno(status);
 770                         goto bail;
 771                 }
 772                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 773                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 774                 status = ocfs2_verify_volume(di, *bh, blksize, stats);
 775                 if (status >= 0)
 776                         goto bail;
 777                 brelse(*bh);
 778                 *bh = NULL;
 779                 if (status != -EAGAIN)
 780                         break;
 781         }
 782
 783 bail:
 784         return status;
 785 }
 786
 787 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 788 {
 789         if (ocfs2_mount_local(osb)) {
 790                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 791                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 792                              "mounted device.\n");
 793                         return -EINVAL;
 794                 }
 795         }
 796
 797         if (ocfs2_userspace_stack(osb)) {
 798                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 799                         mlog(ML_ERROR, "Userspace stack expected, but "
 800                              "o2cb heartbeat arguments passed to mount\n");
 801                         return -EINVAL;
 802                 }
 803         }
 804
 805         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 806                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 807                     !ocfs2_userspace_stack(osb)) {
 808                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 809                              "a read-write clustered device.\n");
 810                         return -EINVAL;
 811                 }
 812         }
 813
 814         return 0;
 815 }
 816
 817 /*
 818  * If we're using a userspace stack, mount should have passed
 819  * a name that matches the disk.  If not, mount should not
 820  * have passed a stack.
 821  */
 822 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 823                                         struct mount_options *mopt)
 824 {
 825         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 826                 mlog(ML_ERROR,
 827                      "cluster stack passed to mount, but this filesystem "
 828                      "does not support it\n");
 829                 return -EINVAL;
 830         }
 831
 832         if (ocfs2_userspace_stack(osb) &&
 833             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 834                     OCFS2_STACK_LABEL_LEN)) {
 835                 mlog(ML_ERROR,
 836                      "cluster stack passed to mount (\"%s\") does not "
 837                      "match the filesystem (\"%s\")\n",
 838                      mopt->cluster_stack,
 839                      osb->osb_cluster_stack);
 840                 return -EINVAL;
 841         }
 842
 843         return 0;
 844 }
 845
 846 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 847 {
 848         int type;
 849         struct super_block *sb = osb->sb;
 850         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 851                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 852         int status = 0;
 853
 854         for (type = 0; type < MAXQUOTAS; type++) {
 855                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 856                         continue;
 857                 if (unsuspend)
 858                         status = vfs_quota_enable(
 859                                         sb_dqopt(sb)->files[type],
 860                                         type, QFMT_OCFS2,
 861                                         DQUOT_SUSPENDED);
 862                 else
 863                         status = vfs_quota_disable(sb, type,
 864                                                    DQUOT_SUSPENDED);
 865                 if (status < 0)
 866                         break;
 867         }
 868         if (status < 0)
 869                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 870                      "remount (error = %d).\n", status);
 871         return status;
 872 }
 873
 874 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 875 {
 876         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 877         struct super_block *sb = osb->sb;
 878         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 879                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 880         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 881                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 882         int status;
 883         int type;
 884
 885         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 886         for (type = 0; type < MAXQUOTAS; type++) {
 887                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 888                         continue;
 889                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 890                                                         osb->slot_num);
 891                 if (!inode[type]) {
 892                         status = -ENOENT;
 893                         goto out_quota_off;
 894                 }
 895                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 896                                                 DQUOT_USAGE_ENABLED);
 897                 if (status < 0)
 898                         goto out_quota_off;
 899         }
 900
 901         for (type = 0; type < MAXQUOTAS; type++)
 902                 iput(inode[type]);
 903         return 0;
 904 out_quota_off:
 905         ocfs2_disable_quotas(osb);
 906         for (type = 0; type < MAXQUOTAS; type++)
 907                 iput(inode[type]);
 908         mlog_errno(status);
 909         return status;
 910 }
 911
 912 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 913 {
 914         int type;
 915         struct inode *inode;
 916         struct super_block *sb = osb->sb;
 917
 918         /* We mostly ignore errors in this function because there's not much
 919          * we can do when we see them */
 920         for (type = 0; type < MAXQUOTAS; type++) {
 921                 if (!sb_has_quota_loaded(sb, type))
 922                         continue;
 923                 inode = igrab(sb->s_dquot.files[type]);
 924                 /* Turn off quotas. This will remove all dquot structures from
 925                  * memory and so they will be automatically synced to global
 926                  * quota files */
 927                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 928                                             DQUOT_LIMITS_ENABLED);
 929                 if (!inode)
 930                         continue;
 931                 iput(inode);
 932         }
 933 }
 934
 935 /* Handle quota on quotactl */
 936 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 937                           char *path, int remount)
 938 {
 939         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 940                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 941
 942         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 943                 return -EINVAL;
 944
 945         if (remount)
 946                 return 0;       /* Just ignore it has been handled in
 947                                  * ocfs2_remount() */
 948         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 949                                     format_id, DQUOT_LIMITS_ENABLED);
 950 }
 951
 952 /* Handle quota off quotactl */
 953 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 954 {
 955         if (remount)
 956                 return 0;       /* Ignore now and handle later in
 957                                  * ocfs2_remount() */
 958         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 959 }
 960
 961 static struct quotactl_ops ocfs2_quotactl_ops = {
 962         .quota_on       = ocfs2_quota_on,
 963         .quota_off      = ocfs2_quota_off,
 964         .quota_sync     = vfs_quota_sync,
 965         .get_info       = vfs_get_dqinfo,
 966         .set_info       = vfs_set_dqinfo,
 967         .get_dqblk      = vfs_get_dqblk,
 968         .set_dqblk      = vfs_set_dqblk,
 969 };
 970
 971 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 972 {
 973         struct dentry *root;
 974         int status, sector_size;
 975         struct mount_options parsed_options;
 976         struct inode *inode = NULL;
 977         struct ocfs2_super *osb = NULL;
 978         struct buffer_head *bh = NULL;
 979         char nodestr[8];
 980         struct ocfs2_blockcheck_stats stats;
 981
 982         mlog_entry("%p, %p, %i", sb, data, silent);
 983
 984         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 985                 status = -EINVAL;
 986                 goto read_super_error;
 987         }
 988
 989         /* probe for superblock */
 990         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
 991         if (status < 0) {
 992                 mlog(ML_ERROR, "superblock probe failed!\n");
 993                 goto read_super_error;
 994         }
 995
 996         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
 997         osb = OCFS2_SB(sb);
 998         if (status < 0) {
 999                 mlog_errno(status);
1000                 goto read_super_error;
1001         }
1002         brelse(bh);
1003         bh = NULL;
1004
1005         if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
1006                 parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1007
1008         osb->s_mount_opt = parsed_options.mount_opt;
1009         osb->s_atime_quantum = parsed_options.atime_quantum;
1010         osb->preferred_slot = parsed_options.slot;
1011         osb->osb_commit_interval = parsed_options.commit_interval;
1012         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1013         osb->local_alloc_bits = osb->local_alloc_default_bits;
1014         if (osb->s_mount_opt & OCFS2_MOUNT_USRQUOTA &&
1015             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1016                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1017                 status = -EINVAL;
1018                 mlog(ML_ERROR, "User quotas were requested, but this "
1019                      "filesystem does not have the feature enabled.\n");
1020                 goto read_super_error;
1021         }
1022         if (osb->s_mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1023             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1024                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1025                 status = -EINVAL;
1026                 mlog(ML_ERROR, "Group quotas were requested, but this "
1027                      "filesystem does not have the feature enabled.\n");
1028                 goto read_super_error;
1029         }
1030
1031         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1032         if (status)
1033                 goto read_super_error;
1034
1035         sb->s_magic = OCFS2_SUPER_MAGIC;
1036
1037         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1038                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1039
1040         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1041          * heartbeat=none */
1042         if (bdev_read_only(sb->s_bdev)) {
1043                 if (!(sb->s_flags & MS_RDONLY)) {
1044                         status = -EACCES;
1045                         mlog(ML_ERROR, "Readonly device detected but readonly "
1046                              "mount was not specified.\n");
1047                         goto read_super_error;
1048                 }
1049
1050                 /* You should not be able to start a local heartbeat
1051                  * on a readonly device. */
1052                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1053                         status = -EROFS;
1054                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1055                              "device.\n");
1056                         goto read_super_error;
1057                 }
1058
1059                 status = ocfs2_check_journals_nolocks(osb);
1060                 if (status < 0) {
1061                         if (status == -EROFS)
1062                                 mlog(ML_ERROR, "Recovery required on readonly "
1063                                      "file system, but write access is "
1064                                      "unavailable.\n");
1065                         else
1066                                 mlog_errno(status);
1067                         goto read_super_error;
1068                 }
1069
1070                 ocfs2_set_ro_flag(osb, 1);
1071
1072                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1073                        "services will be utilized for this mount. Recovery "
1074                        "will be skipped.\n");
1075         }
1076
1077         if (!ocfs2_is_hard_readonly(osb)) {
1078                 if (sb->s_flags & MS_RDONLY)
1079                         ocfs2_set_ro_flag(osb, 0);
1080         }
1081
1082         status = ocfs2_verify_heartbeat(osb);
1083         if (status < 0) {
1084                 mlog_errno(status);
1085                 goto read_super_error;
1086         }
1087
1088         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1089                                                  ocfs2_debugfs_root);
1090         if (!osb->osb_debug_root) {
1091                 status = -EINVAL;
1092                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1093                 goto read_super_error;
1094         }
1095
1096         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1097                                             osb->osb_debug_root,
1098                                             osb,
1099                                             &ocfs2_osb_debug_fops);
1100         if (!osb->osb_ctxt) {
1101                 status = -EINVAL;
1102                 mlog_errno(status);
1103                 goto read_super_error;
1104         }
1105
1106         if (ocfs2_meta_ecc(osb)) {
1107                 status = ocfs2_blockcheck_stats_debugfs_install(
1108                                                 &osb->osb_ecc_stats,
1109                                                 osb->osb_debug_root);
1110                 if (status) {
1111                         mlog(ML_ERROR,
1112                              "Unable to create blockcheck statistics "
1113                              "files\n");
1114                         goto read_super_error;
1115                 }
1116         }
1117
1118         status = ocfs2_mount_volume(sb);
1119         if (osb->root_inode)
1120                 inode = igrab(osb->root_inode);
1121
1122         if (status < 0)
1123                 goto read_super_error;
1124
1125         if (!inode) {
1126                 status = -EIO;
1127                 mlog_errno(status);
1128                 goto read_super_error;
1129         }
1130
1131         root = d_alloc_root(inode);
1132         if (!root) {
1133                 status = -ENOMEM;
1134                 mlog_errno(status);
1135                 goto read_super_error;
1136         }
1137
1138         sb->s_root = root;
1139
1140         ocfs2_complete_mount_recovery(osb);
1141
1142         if (ocfs2_mount_local(osb))
1143                 snprintf(nodestr, sizeof(nodestr), "local");
1144         else
1145                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1146
1147         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1148                "with %s data mode.\n",
1149                osb->dev_str, nodestr, osb->slot_num,
1150                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1151                "ordered");
1152
1153         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1154         wake_up(&osb->osb_mount_event);
1155
1156         /* Now we can initialize quotas because we can afford to wait
1157          * for cluster locks recovery now. That also means that truncation
1158          * log recovery can happen but that waits for proper quota setup */
1159         if (!(sb->s_flags & MS_RDONLY)) {
1160                 status = ocfs2_enable_quotas(osb);
1161                 if (status < 0) {
1162                         /* We have to err-out specially here because
1163                          * s_root is already set */
1164                         mlog_errno(status);
1165                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1166                         wake_up(&osb->osb_mount_event);
1167                         mlog_exit(status);
1168                         return status;
1169                 }
1170         }
1171
1172         ocfs2_complete_quota_recovery(osb);
1173
1174         /* Now we wake up again for processes waiting for quotas */
1175         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1176         wake_up(&osb->osb_mount_event);
1177
1178         mlog_exit(status);
1179         return status;
1180
1181 read_super_error:
1182         brelse(bh);
1183
1184         if (inode)
1185                 iput(inode);
1186
1187         if (osb) {
1188                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1189                 wake_up(&osb->osb_mount_event);
1190                 ocfs2_dismount_volume(sb, 1);
1191         }
1192
1193         mlog_exit(status);
1194         return status;
1195 }
1196
1197 static int ocfs2_get_sb(struct file_system_type *fs_type,
1198                         int flags,
1199                         const char *dev_name,
1200                         void *data,
1201                         struct vfsmount *mnt)
1202 {
1203         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1204                            mnt);
1205 }
1206
1207 static struct file_system_type ocfs2_fs_type = {
1208         .owner          = THIS_MODULE,
1209         .name           = "ocfs2",
1210         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1211                                         * the fs? */
1212         .kill_sb        = kill_block_super, /* set to the generic one
1213                                              * right now, but do we
1214                                              * need to change that? */
1215         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1216         .next           = NULL
1217 };
1218
1219 static int ocfs2_parse_options(struct super_block *sb,
1220                                char *options,
1221                                struct mount_options *mopt,
1222                                int is_remount)
1223 {
1224         int status;
1225         char *p;
1226
1227         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1228                    options ? options : "(none)");
1229
1230         mopt->commit_interval = 0;
1231         mopt->mount_opt = 0;
1232         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1233         mopt->slot = OCFS2_INVALID_SLOT;
1234         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1235         mopt->cluster_stack[0] = '\0';
1236
1237         if (!options) {
1238                 status = 1;
1239                 goto bail;
1240         }
1241
1242         while ((p = strsep(&options, ",")) != NULL) {
1243                 int token, option;
1244                 substring_t args[MAX_OPT_ARGS];
1245
1246                 if (!*p)
1247                         continue;
1248
1249                 token = match_token(p, tokens, args);
1250                 switch (token) {
1251                 case Opt_hb_local:
1252                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1253                         break;
1254                 case Opt_hb_none:
1255                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1256                         break;
1257                 case Opt_barrier:
1258                         if (match_int(&args[0], &option)) {
1259                                 status = 0;
1260                                 goto bail;
1261                         }
1262                         if (option)
1263                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1264                         else
1265                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1266                         break;
1267                 case Opt_intr:
1268                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1269                         break;
1270                 case Opt_nointr:
1271                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1272                         break;
1273                 case Opt_err_panic:
1274                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1275                         break;
1276                 case Opt_err_ro:
1277                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1278                         break;
1279                 case Opt_data_ordered:
1280                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1281                         break;
1282                 case Opt_data_writeback:
1283                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1284                         break;
1285                 case Opt_user_xattr:
1286                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1287                         break;
1288                 case Opt_nouser_xattr:
1289                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1290                         break;
1291                 case Opt_atime_quantum:
1292                         if (match_int(&args[0], &option)) {
1293                                 status = 0;
1294                                 goto bail;
1295                         }
1296                         if (option >= 0)
1297                                 mopt->atime_quantum = option;
1298                         break;
1299                 case Opt_slot:
1300                         option = 0;
1301                         if (match_int(&args[0], &option)) {
1302                                 status = 0;
1303                                 goto bail;
1304                         }
1305                         if (option)
1306                                 mopt->slot = (s16)option;
1307                         break;
1308                 case Opt_commit:
1309                         option = 0;
1310                         if (match_int(&args[0], &option)) {
1311                                 status = 0;
1312                                 goto bail;
1313                         }
1314                         if (option < 0)
1315                                 return 0;
1316                         if (option == 0)
1317                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1318                         mopt->commit_interval = HZ * option;
1319                         break;
1320                 case Opt_localalloc:
1321                         option = 0;
1322                         if (match_int(&args[0], &option)) {
1323                                 status = 0;
1324                                 goto bail;
1325                         }
1326                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1327                                 mopt->localalloc_opt = option;
1328                         break;
1329                 case Opt_localflocks:
1330                         /*
1331                          * Changing this during remount could race
1332                          * flock() requests, or "unbalance" existing
1333                          * ones (e.g., a lock is taken in one mode but
1334                          * dropped in the other). If users care enough
1335                          * to flip locking modes during remount, we
1336                          * could add a "local" flag to individual
1337                          * flock structures for proper tracking of
1338                          * state.
1339                          */
1340                         if (!is_remount)
1341                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1342                         break;
1343                 case Opt_stack:
1344                         /* Check both that the option we were passed
1345                          * is of the right length and that it is a proper
1346                          * string of the right length.
1347                          */
1348                         if (((args[0].to - args[0].from) !=
1349                              OCFS2_STACK_LABEL_LEN) ||
1350                             (strnlen(args[0].from,
1351                                      OCFS2_STACK_LABEL_LEN) !=
1352                              OCFS2_STACK_LABEL_LEN)) {
1353                                 mlog(ML_ERROR,
1354                                      "Invalid cluster_stack option\n");
1355                                 status = 0;
1356                                 goto bail;
1357                         }
1358                         memcpy(mopt->cluster_stack, args[0].from,
1359                                OCFS2_STACK_LABEL_LEN);
1360                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1361                         break;
1362                 case Opt_inode64:
1363                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1364                         break;
1365                 case Opt_usrquota:
1366                         /* We check only on remount, otherwise features
1367                          * aren't yet initialized. */
1368                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1369                             OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1370                                 mlog(ML_ERROR, "User quota requested but "
1371                                      "filesystem feature is not set\n");
1372                                 status = 0;
1373                                 goto bail;
1374                         }
1375                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1376                         break;
1377                 case Opt_grpquota:
1378                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1379                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1380                                 mlog(ML_ERROR, "Group quota requested but "
1381                                      "filesystem feature is not set\n");
1382                                 status = 0;
1383                                 goto bail;
1384                         }
1385                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1386                         break;
1387 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1388                 case Opt_acl:
1389                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1390                         break;
1391                 case Opt_noacl:
1392                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1393                         break;
1394 #else
1395                 case Opt_acl:
1396                 case Opt_noacl:
1397                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
1398                         break;
1399 #endif
1400                 default:
1401                         mlog(ML_ERROR,
1402                              "Unrecognized mount option \"%s\" "
1403                              "or missing value\n", p);
1404                         status = 0;
1405                         goto bail;
1406                 }
1407         }
1408
1409         status = 1;
1410
1411 bail:
1412         mlog_exit(status);
1413         return status;
1414 }
1415
1416 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1417 {
1418         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1419         unsigned long opts = osb->s_mount_opt;
1420         unsigned int local_alloc_megs;
1421
1422         if (opts & OCFS2_MOUNT_HB_LOCAL)
1423                 seq_printf(s, ",_netdev,heartbeat=local");
1424         else
1425                 seq_printf(s, ",heartbeat=none");
1426
1427         if (opts & OCFS2_MOUNT_NOINTR)
1428                 seq_printf(s, ",nointr");
1429
1430         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1431                 seq_printf(s, ",data=writeback");
1432         else
1433                 seq_printf(s, ",data=ordered");
1434
1435         if (opts & OCFS2_MOUNT_BARRIER)
1436                 seq_printf(s, ",barrier=1");
1437
1438         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1439                 seq_printf(s, ",errors=panic");
1440         else
1441                 seq_printf(s, ",errors=remount-ro");
1442
1443         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1444                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1445
1446         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1447                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1448
1449         if (osb->osb_commit_interval)
1450                 seq_printf(s, ",commit=%u",
1451                            (unsigned) (osb->osb_commit_interval / HZ));
1452
1453         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1454         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1455                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1456
1457         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1458                 seq_printf(s, ",localflocks,");
1459
1460         if (osb->osb_cluster_stack[0])
1461                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1462                            osb->osb_cluster_stack);
1463         if (opts & OCFS2_MOUNT_USRQUOTA)
1464                 seq_printf(s, ",usrquota");
1465         if (opts & OCFS2_MOUNT_GRPQUOTA)
1466                 seq_printf(s, ",grpquota");
1467
1468         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1469                 seq_printf(s, ",nouser_xattr");
1470         else
1471                 seq_printf(s, ",user_xattr");
1472
1473         if (opts & OCFS2_MOUNT_INODE64)
1474                 seq_printf(s, ",inode64");
1475
1476 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1477         if (opts & OCFS2_MOUNT_POSIX_ACL)
1478                 seq_printf(s, ",acl");
1479         else
1480                 seq_printf(s, ",noacl");
1481 #endif
1482
1483         return 0;
1484 }
1485
1486 static int __init ocfs2_init(void)
1487 {
1488         int status;
1489
1490         mlog_entry_void();
1491
1492         ocfs2_print_version();
1493
1494         status = init_ocfs2_uptodate_cache();
1495         if (status < 0) {
1496                 mlog_errno(status);
1497                 goto leave;
1498         }
1499
1500         status = ocfs2_initialize_mem_caches();
1501         if (status < 0) {
1502                 mlog_errno(status);
1503                 goto leave;
1504         }
1505
1506         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1507         if (!ocfs2_wq) {
1508                 status = -ENOMEM;
1509                 goto leave;
1510         }
1511
1512         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1513         if (!ocfs2_debugfs_root) {
1514                 status = -EFAULT;
1515                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1516         }
1517
1518         status = ocfs2_quota_setup();
1519         if (status)
1520                 goto leave;
1521
1522         ocfs2_set_locking_protocol();
1523
1524         status = register_quota_format(&ocfs2_quota_format);
1525 leave:
1526         if (status < 0) {
1527                 ocfs2_quota_shutdown();
1528                 ocfs2_free_mem_caches();
1529                 exit_ocfs2_uptodate_cache();
1530         }
1531
1532         mlog_exit(status);
1533
1534         if (status >= 0) {
1535                 return register_filesystem(&ocfs2_fs_type);
1536         } else
1537                 return -1;
1538 }
1539
1540 static void __exit ocfs2_exit(void)
1541 {
1542         mlog_entry_void();
1543
1544         ocfs2_quota_shutdown();
1545
1546         if (ocfs2_wq) {
1547                 flush_workqueue(ocfs2_wq);
1548                 destroy_workqueue(ocfs2_wq);
1549         }
1550
1551         unregister_quota_format(&ocfs2_quota_format);
1552
1553         debugfs_remove(ocfs2_debugfs_root);
1554
1555         ocfs2_free_mem_caches();
1556
1557         unregister_filesystem(&ocfs2_fs_type);
1558
1559         exit_ocfs2_uptodate_cache();
1560
1561         mlog_exit_void();
1562 }
1563
1564 static void ocfs2_put_super(struct super_block *sb)
1565 {
1566         mlog_entry("(0x%p)\n", sb);
1567
1568         lock_kernel();
1569
1570         ocfs2_sync_blockdev(sb);
1571         ocfs2_dismount_volume(sb, 0);
1572
1573         unlock_kernel();
1574
1575         mlog_exit_void();
1576 }
1577
1578 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1579 {
1580         struct ocfs2_super *osb;
1581         u32 numbits, freebits;
1582         int status;
1583         struct ocfs2_dinode *bm_lock;
1584         struct buffer_head *bh = NULL;
1585         struct inode *inode = NULL;
1586
1587         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1588
1589         osb = OCFS2_SB(dentry->d_sb);
1590
1591         inode = ocfs2_get_system_file_inode(osb,
1592                                             GLOBAL_BITMAP_SYSTEM_INODE,
1593                                             OCFS2_INVALID_SLOT);
1594         if (!inode) {
1595                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1596                 status = -EIO;
1597                 goto bail;
1598         }
1599
1600         status = ocfs2_inode_lock(inode, &bh, 0);
1601         if (status < 0) {
1602                 mlog_errno(status);
1603                 goto bail;
1604         }
1605
1606         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1607
1608         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1609         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1610
1611         buf->f_type = OCFS2_SUPER_MAGIC;
1612         buf->f_bsize = dentry->d_sb->s_blocksize;
1613         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1614         buf->f_blocks = ((sector_t) numbits) *
1615                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1616         buf->f_bfree = ((sector_t) freebits) *
1617                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1618         buf->f_bavail = buf->f_bfree;
1619         buf->f_files = numbits;
1620         buf->f_ffree = freebits;
1621
1622         brelse(bh);
1623
1624         ocfs2_inode_unlock(inode, 0);
1625         status = 0;
1626 bail:
1627         if (inode)
1628                 iput(inode);
1629
1630         mlog_exit(status);
1631
1632         return status;
1633 }
1634
1635 static void ocfs2_inode_init_once(void *data)
1636 {
1637         struct ocfs2_inode_info *oi = data;
1638
1639         oi->ip_flags = 0;
1640         oi->ip_open_count = 0;
1641         spin_lock_init(&oi->ip_lock);
1642         ocfs2_extent_map_init(&oi->vfs_inode);
1643         INIT_LIST_HEAD(&oi->ip_io_markers);
1644         oi->ip_created_trans = 0;
1645         oi->ip_last_trans = 0;
1646         oi->ip_dir_start_lookup = 0;
1647
1648         init_rwsem(&oi->ip_alloc_sem);
1649         init_rwsem(&oi->ip_xattr_sem);
1650         mutex_init(&oi->ip_io_mutex);
1651
1652         oi->ip_blkno = 0ULL;
1653         oi->ip_clusters = 0;
1654
1655         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1656         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1657         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1658
1659         ocfs2_metadata_cache_init(&oi->vfs_inode);
1660
1661         inode_init_once(&oi->vfs_inode);
1662 }
1663
1664 static int ocfs2_initialize_mem_caches(void)
1665 {
1666         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1667                                        sizeof(struct ocfs2_inode_info),
1668                                        0,
1669                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1670                                                 SLAB_MEM_SPREAD),
1671                                        ocfs2_inode_init_once);
1672         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1673                                         sizeof(struct ocfs2_dquot),
1674                                         0,
1675                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1676                                                 SLAB_MEM_SPREAD),
1677                                         NULL);
1678         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1679                                         sizeof(struct ocfs2_quota_chunk),
1680                                         0,
1681                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1682                                         NULL);
1683         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1684             !ocfs2_qf_chunk_cachep) {
1685                 if (ocfs2_inode_cachep)
1686                         kmem_cache_destroy(ocfs2_inode_cachep);
1687                 if (ocfs2_dquot_cachep)
1688                         kmem_cache_destroy(ocfs2_dquot_cachep);
1689                 if (ocfs2_qf_chunk_cachep)
1690                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1691                 return -ENOMEM;
1692         }
1693
1694         return 0;
1695 }
1696
1697 static void ocfs2_free_mem_caches(void)
1698 {
1699         if (ocfs2_inode_cachep)
1700                 kmem_cache_destroy(ocfs2_inode_cachep);
1701         ocfs2_inode_cachep = NULL;
1702
1703         if (ocfs2_dquot_cachep)
1704                 kmem_cache_destroy(ocfs2_dquot_cachep);
1705         ocfs2_dquot_cachep = NULL;
1706
1707         if (ocfs2_qf_chunk_cachep)
1708                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1709         ocfs2_qf_chunk_cachep = NULL;
1710 }
1711
1712 static int ocfs2_get_sector(struct super_block *sb,
1713                             struct buffer_head **bh,
1714                             int block,
1715                             int sect_size)
1716 {
1717         if (!sb_set_blocksize(sb, sect_size)) {
1718                 mlog(ML_ERROR, "unable to set blocksize\n");
1719                 return -EIO;
1720         }
1721
1722         *bh = sb_getblk(sb, block);
1723         if (!*bh) {
1724                 mlog_errno(-EIO);
1725                 return -EIO;
1726         }
1727         lock_buffer(*bh);
1728         if (!buffer_dirty(*bh))
1729                 clear_buffer_uptodate(*bh);
1730         unlock_buffer(*bh);
1731         ll_rw_block(READ, 1, bh);
1732         wait_on_buffer(*bh);
1733         if (!buffer_uptodate(*bh)) {
1734                 mlog_errno(-EIO);
1735                 brelse(*bh);
1736                 *bh = NULL;
1737                 return -EIO;
1738         }
1739
1740         return 0;
1741 }
1742
1743 static int ocfs2_mount_volume(struct super_block *sb)
1744 {
1745         int status = 0;
1746         int unlock_super = 0;
1747         struct ocfs2_super *osb = OCFS2_SB(sb);
1748
1749         mlog_entry_void();
1750
1751         if (ocfs2_is_hard_readonly(osb))
1752                 goto leave;
1753
1754         status = ocfs2_dlm_init(osb);
1755         if (status < 0) {
1756                 mlog_errno(status);
1757                 goto leave;
1758         }
1759
1760         status = ocfs2_super_lock(osb, 1);
1761         if (status < 0) {
1762                 mlog_errno(status);
1763                 goto leave;
1764         }
1765         unlock_super = 1;
1766
1767         /* This will load up the node map and add ourselves to it. */
1768         status = ocfs2_find_slot(osb);
1769         if (status < 0) {
1770                 mlog_errno(status);
1771                 goto leave;
1772         }
1773
1774         /* load all node-local system inodes */
1775         status = ocfs2_init_local_system_inodes(osb);
1776         if (status < 0) {
1777                 mlog_errno(status);
1778                 goto leave;
1779         }
1780
1781         status = ocfs2_check_volume(osb);
1782         if (status < 0) {
1783                 mlog_errno(status);
1784                 goto leave;
1785         }
1786
1787         status = ocfs2_truncate_log_init(osb);
1788         if (status < 0)
1789                 mlog_errno(status);
1790
1791 leave:
1792         if (unlock_super)
1793                 ocfs2_super_unlock(osb, 1);
1794
1795         mlog_exit(status);
1796         return status;
1797 }
1798
1799 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1800 {
1801         int tmp, hangup_needed = 0;
1802         struct ocfs2_super *osb = NULL;
1803         char nodestr[8];
1804
1805         mlog_entry("(0x%p)\n", sb);
1806
1807         BUG_ON(!sb);
1808         osb = OCFS2_SB(sb);
1809         BUG_ON(!osb);
1810
1811         debugfs_remove(osb->osb_ctxt);
1812
1813         ocfs2_disable_quotas(osb);
1814
1815         ocfs2_shutdown_local_alloc(osb);
1816
1817         ocfs2_truncate_log_shutdown(osb);
1818
1819         ocfs2_orphan_scan_stop(osb);
1820
1821         /* This will disable recovery and flush any recovery work. */
1822         ocfs2_recovery_exit(osb);
1823
1824         ocfs2_journal_shutdown(osb);
1825
1826         ocfs2_sync_blockdev(sb);
1827
1828         /* No cluster connection means we've failed during mount, so skip
1829          * all the steps which depended on that to complete. */
1830         if (osb->cconn) {
1831                 tmp = ocfs2_super_lock(osb, 1);
1832                 if (tmp < 0) {
1833                         mlog_errno(tmp);
1834                         return;
1835                 }
1836         }
1837
1838         if (osb->slot_num != OCFS2_INVALID_SLOT)
1839                 ocfs2_put_slot(osb);
1840
1841         if (osb->cconn)
1842                 ocfs2_super_unlock(osb, 1);
1843
1844         ocfs2_release_system_inodes(osb);
1845
1846         /*
1847          * If we're dismounting due to mount error, mount.ocfs2 will clean
1848          * up heartbeat.  If we're a local mount, there is no heartbeat.
1849          * If we failed before we got a uuid_str yet, we can't stop
1850          * heartbeat.  Otherwise, do it.
1851          */
1852         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1853                 hangup_needed = 1;
1854
1855         if (osb->cconn)
1856                 ocfs2_dlm_shutdown(osb, hangup_needed);
1857
1858         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1859         debugfs_remove(osb->osb_debug_root);
1860
1861         if (hangup_needed)
1862                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1863
1864         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1865
1866         if (ocfs2_mount_local(osb))
1867                 snprintf(nodestr, sizeof(nodestr), "local");
1868         else
1869                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1870
1871         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1872                osb->dev_str, nodestr);
1873
1874         ocfs2_delete_osb(osb);
1875         kfree(osb);
1876         sb->s_dev = 0;
1877         sb->s_fs_info = NULL;
1878 }
1879
1880 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1881                                 unsigned uuid_bytes)
1882 {
1883         int i, ret;
1884         char *ptr;
1885
1886         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1887
1888         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1889         if (osb->uuid_str == NULL)
1890                 return -ENOMEM;
1891
1892         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1893                 /* print with null */
1894                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1895                 if (ret != 2) /* drop super cleans up */
1896                         return -EINVAL;
1897                 /* then only advance past the last char */
1898                 ptr += 2;
1899         }
1900
1901         return 0;
1902 }
1903
1904 static int ocfs2_initialize_super(struct super_block *sb,
1905                                   struct buffer_head *bh,
1906                                   int sector_size,
1907                                   struct ocfs2_blockcheck_stats *stats)
1908 {
1909         int status;
1910         int i, cbits, bbits;
1911         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1912         struct inode *inode = NULL;
1913         struct ocfs2_journal *journal;
1914         __le32 uuid_net_key;
1915         struct ocfs2_super *osb;
1916
1917         mlog_entry_void();
1918
1919         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1920         if (!osb) {
1921                 status = -ENOMEM;
1922                 mlog_errno(status);
1923                 goto bail;
1924         }
1925
1926         sb->s_fs_info = osb;
1927         sb->s_op = &ocfs2_sops;
1928         sb->s_export_op = &ocfs2_export_ops;
1929         sb->s_qcop = &ocfs2_quotactl_ops;
1930         sb->dq_op = &ocfs2_quota_operations;
1931         sb->s_xattr = ocfs2_xattr_handlers;
1932         sb->s_time_gran = 1;
1933         sb->s_flags |= MS_NOATIME;
1934         /* this is needed to support O_LARGEFILE */
1935         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1936         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1937         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1938
1939         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1940
1941         for (i = 0; i < 3; i++)
1942                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1943         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1944
1945         osb->sb = sb;
1946         /* Save off for ocfs2_rw_direct */
1947         osb->s_sectsize_bits = blksize_bits(sector_size);
1948         BUG_ON(!osb->s_sectsize_bits);
1949
1950         spin_lock_init(&osb->dc_task_lock);
1951         init_waitqueue_head(&osb->dc_event);
1952         osb->dc_work_sequence = 0;
1953         osb->dc_wake_sequence = 0;
1954         INIT_LIST_HEAD(&osb->blocked_lock_list);
1955         osb->blocked_lock_count = 0;
1956         spin_lock_init(&osb->osb_lock);
1957         spin_lock_init(&osb->osb_xattr_lock);
1958         ocfs2_init_inode_steal_slot(osb);
1959
1960         atomic_set(&osb->alloc_stats.moves, 0);
1961         atomic_set(&osb->alloc_stats.local_data, 0);
1962         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1963         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1964         atomic_set(&osb->alloc_stats.bg_extends, 0);
1965
1966         /* Copy the blockcheck stats from the superblock probe */
1967         osb->osb_ecc_stats = *stats;
1968
1969         ocfs2_init_node_maps(osb);
1970
1971         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1972                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1973
1974         status = ocfs2_recovery_init(osb);
1975         if (status) {
1976                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1977                 mlog_errno(status);
1978                 goto bail;
1979         }
1980
1981         status = ocfs2_orphan_scan_init(osb);
1982         if (status) {
1983                 mlog(ML_ERROR, "Unable to initialize delayed orphan scan\n");
1984                 mlog_errno(status);
1985                 goto bail;
1986         }
1987
1988         init_waitqueue_head(&osb->checkpoint_event);
1989         atomic_set(&osb->needs_checkpoint, 0);
1990
1991         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1992
1993         osb->slot_num = OCFS2_INVALID_SLOT;
1994
1995         osb->s_xattr_inline_size = le16_to_cpu(
1996                                         di->id2.i_super.s_xattr_inline_size);
1997
1998         osb->local_alloc_state = OCFS2_LA_UNUSED;
1999         osb->local_alloc_bh = NULL;
2000         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2001
2002         init_waitqueue_head(&osb->osb_mount_event);
2003
2004         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2005         if (!osb->vol_label) {
2006                 mlog(ML_ERROR, "unable to alloc vol label\n");
2007                 status = -ENOMEM;
2008                 goto bail;
2009         }
2010
2011         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2012         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2013                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2014                      osb->max_slots);
2015                 status = -EINVAL;
2016                 goto bail;
2017         }
2018         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2019
2020         osb->slot_recovery_generations =
2021                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2022                         GFP_KERNEL);
2023         if (!osb->slot_recovery_generations) {
2024                 status = -ENOMEM;
2025                 mlog_errno(status);
2026                 goto bail;
2027         }
2028
2029         init_waitqueue_head(&osb->osb_wipe_event);
2030         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2031                                         sizeof(*osb->osb_orphan_wipes),
2032                                         GFP_KERNEL);
2033         if (!osb->osb_orphan_wipes) {
2034                 status = -ENOMEM;
2035                 mlog_errno(status);
2036                 goto bail;
2037         }
2038
2039         osb->s_feature_compat =
2040                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2041         osb->s_feature_ro_compat =
2042                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2043         osb->s_feature_incompat =
2044                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2045
2046         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2047                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2048                      "optional features (%x).\n", i);
2049                 status = -EINVAL;
2050                 goto bail;
2051         }
2052         if (!(osb->sb->s_flags & MS_RDONLY) &&
2053             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2054                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2055                      "unsupported optional features (%x).\n", i);
2056                 status = -EINVAL;
2057                 goto bail;
2058         }
2059
2060         if (ocfs2_userspace_stack(osb)) {
2061                 memcpy(osb->osb_cluster_stack,
2062                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2063                        OCFS2_STACK_LABEL_LEN);
2064                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2065                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2066                         mlog(ML_ERROR,
2067                              "couldn't mount because of an invalid "
2068                              "cluster stack label (%s) \n",
2069                              osb->osb_cluster_stack);
2070                         status = -EINVAL;
2071                         goto bail;
2072                 }
2073         } else {
2074                 /* The empty string is identical with classic tools that
2075                  * don't know about s_cluster_info. */
2076                 osb->osb_cluster_stack[0] = '\0';
2077         }
2078
2079         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2080
2081         /* FIXME
2082          * This should be done in ocfs2_journal_init(), but unknown
2083          * ordering issues will cause the filesystem to crash.
2084          * If anyone wants to figure out what part of the code
2085          * refers to osb->journal before ocfs2_journal_init() is run,
2086          * be my guest.
2087          */
2088         /* initialize our journal structure */
2089
2090         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2091         if (!journal) {
2092                 mlog(ML_ERROR, "unable to alloc journal\n");
2093                 status = -ENOMEM;
2094                 goto bail;
2095         }
2096         osb->journal = journal;
2097         journal->j_osb = osb;
2098
2099         atomic_set(&journal->j_num_trans, 0);
2100         init_rwsem(&journal->j_trans_barrier);
2101         init_waitqueue_head(&journal->j_checkpointed);
2102         spin_lock_init(&journal->j_lock);
2103         journal->j_trans_id = (unsigned long) 1;
2104         INIT_LIST_HEAD(&journal->j_la_cleanups);
2105         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2106         journal->j_state = OCFS2_JOURNAL_FREE;
2107
2108         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2109         osb->dentry_lock_list = NULL;
2110
2111         /* get some pseudo constants for clustersize bits */
2112         osb->s_clustersize_bits =
2113                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2114         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2115         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2116
2117         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2118             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2119                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2120                      osb->s_clustersize);
2121                 status = -EINVAL;
2122                 goto bail;
2123         }
2124
2125         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2126             > (u32)~0UL) {
2127                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2128                      "what jbd can address in 32 bits.\n");
2129                 status = -EINVAL;
2130                 goto bail;
2131         }
2132
2133         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2134                                  sizeof(di->id2.i_super.s_uuid))) {
2135                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2136                 status = -ENOMEM;
2137                 goto bail;
2138         }
2139
2140         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2141
2142         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2143         osb->vol_label[63] = '\0';
2144         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2145         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2146         osb->first_cluster_group_blkno =
2147                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2148         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2149         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2150         mlog(0, "vol_label: %s\n", osb->vol_label);
2151         mlog(0, "uuid: %s\n", osb->uuid_str);
2152         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2153              (unsigned long long)osb->root_blkno,
2154              (unsigned long long)osb->system_dir_blkno);
2155
2156         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2157         if (!osb->osb_dlm_debug) {
2158                 status = -ENOMEM;
2159                 mlog_errno(status);
2160                 goto bail;
2161         }
2162
2163         atomic_set(&osb->vol_state, VOLUME_INIT);
2164
2165         /* load root, system_dir, and all global system inodes */
2166         status = ocfs2_init_global_system_inodes(osb);
2167         if (status < 0) {
2168                 mlog_errno(status);
2169                 goto bail;
2170         }
2171
2172         /*
2173          * global bitmap
2174          */
2175         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2176                                             OCFS2_INVALID_SLOT);
2177         if (!inode) {
2178                 status = -EINVAL;
2179                 mlog_errno(status);
2180                 goto bail;
2181         }
2182
2183         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2184         iput(inode);
2185
2186         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2187
2188         status = ocfs2_init_slot_info(osb);
2189         if (status < 0) {
2190                 mlog_errno(status);
2191                 goto bail;
2192         }
2193
2194 bail:
2195         mlog_exit(status);
2196         return status;
2197 }
2198
2199 /*
2200  * will return: -EAGAIN if it is ok to keep searching for superblocks
2201  *              -EINVAL if there is a bad superblock
2202  *              0 on success
2203  */
2204 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2205                                struct buffer_head *bh,
2206                                u32 blksz,
2207                                struct ocfs2_blockcheck_stats *stats)
2208 {
2209         int status = -EAGAIN;
2210
2211         mlog_entry_void();
2212
2213         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2214                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2215                 /* We have to do a raw check of the feature here */
2216                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2217                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2218                         status = ocfs2_block_check_validate(bh->b_data,
2219                                                             bh->b_size,
2220                                                             &di->i_check,
2221                                                             stats);
2222                         if (status)
2223                                 goto out;
2224                 }
2225                 status = -EINVAL;
2226                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2227                         mlog(ML_ERROR, "found superblock with incorrect block "
2228                              "size: found %u, should be %u\n",
2229                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2230                                blksz);
2231                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2232                            OCFS2_MAJOR_REV_LEVEL ||
2233                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2234                            OCFS2_MINOR_REV_LEVEL) {
2235                         mlog(ML_ERROR, "found superblock with bad version: "
2236                              "found %u.%u, should be %u.%u\n",
2237                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2238                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2239                              OCFS2_MAJOR_REV_LEVEL,
2240                              OCFS2_MINOR_REV_LEVEL);
2241                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2242                         mlog(ML_ERROR, "bad block number on superblock: "
2243                              "found %llu, should be %llu\n",
2244                              (unsigned long long)le64_to_cpu(di->i_blkno),
2245                              (unsigned long long)bh->b_blocknr);
2246                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2247                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2248                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2249                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2250                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2251                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2252                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2253                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2254                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2255                         mlog(ML_ERROR,
2256                              "Superblock slots found greater than file system "
2257                              "maximum: found %u, max %u\n",
2258                              le16_to_cpu(di->id2.i_super.s_max_slots),
2259                              OCFS2_MAX_SLOTS);
2260                 } else {
2261                         /* found it! */
2262                         status = 0;
2263                 }
2264         }
2265
2266 out:
2267         mlog_exit(status);
2268         return status;
2269 }
2270
2271 static int ocfs2_check_volume(struct ocfs2_super *osb)
2272 {
2273         int status;
2274         int dirty;
2275         int local;
2276         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2277                                                   * recover
2278                                                   * ourselves. */
2279
2280         mlog_entry_void();
2281
2282         /* Init our journal object. */
2283         status = ocfs2_journal_init(osb->journal, &dirty);
2284         if (status < 0) {
2285                 mlog(ML_ERROR, "Could not initialize journal!\n");
2286                 goto finally;
2287         }
2288
2289         /* If the journal was unmounted cleanly then we don't want to
2290          * recover anything. Otherwise, journal_load will do that
2291          * dirty work for us :) */
2292         if (!dirty) {
2293                 status = ocfs2_journal_wipe(osb->journal, 0);
2294                 if (status < 0) {
2295                         mlog_errno(status);
2296                         goto finally;
2297                 }
2298         } else {
2299                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2300                      "recovering volume.\n");
2301         }
2302
2303         local = ocfs2_mount_local(osb);
2304
2305         /* will play back anything left in the journal. */
2306         status = ocfs2_journal_load(osb->journal, local, dirty);
2307         if (status < 0) {
2308                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2309                 goto finally;
2310         }
2311
2312         if (dirty) {
2313                 /* recover my local alloc if we didn't unmount cleanly. */
2314                 status = ocfs2_begin_local_alloc_recovery(osb,
2315                                                           osb->slot_num,
2316                                                           &local_alloc);
2317                 if (status < 0) {
2318                         mlog_errno(status);
2319                         goto finally;
2320                 }
2321                 /* we complete the recovery process after we've marked
2322                  * ourselves as mounted. */
2323         }
2324
2325         mlog(0, "Journal loaded.\n");
2326
2327         status = ocfs2_load_local_alloc(osb);
2328         if (status < 0) {
2329                 mlog_errno(status);
2330                 goto finally;
2331         }
2332
2333         if (dirty) {
2334                 /* Recovery will be completed after we've mounted the
2335                  * rest of the volume. */
2336                 osb->dirty = 1;
2337                 osb->local_alloc_copy = local_alloc;
2338                 local_alloc = NULL;
2339         }
2340
2341         /* go through each journal, trylock it and if you get the
2342          * lock, and it's marked as dirty, set the bit in the recover
2343          * map and launch a recovery thread for it. */
2344         status = ocfs2_mark_dead_nodes(osb);
2345         if (status < 0) {
2346                 mlog_errno(status);
2347                 goto finally;
2348         }
2349
2350         status = ocfs2_compute_replay_slots(osb);
2351         if (status < 0)
2352                 mlog_errno(status);
2353
2354 finally:
2355         if (local_alloc)
2356                 kfree(local_alloc);
2357
2358         mlog_exit(status);
2359         return status;
2360 }
2361
2362 /*
2363  * The routine gets called from dismount or close whenever a dismount on
2364  * volume is requested and the osb open count becomes 1.
2365  * It will remove the osb from the global list and also free up all the
2366  * initialized resources and fileobject.
2367  */
2368 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2369 {
2370         mlog_entry_void();
2371
2372         /* This function assumes that the caller has the main osb resource */
2373
2374         ocfs2_free_slot_info(osb);
2375
2376         kfree(osb->osb_orphan_wipes);
2377         kfree(osb->slot_recovery_generations);
2378         /* FIXME
2379          * This belongs in journal shutdown, but because we have to
2380          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2381          * we free it here.
2382          */
2383         kfree(osb->journal);
2384         if (osb->local_alloc_copy)
2385                 kfree(osb->local_alloc_copy);
2386         kfree(osb->uuid_str);
2387         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2388         memset(osb, 0, sizeof(struct ocfs2_super));
2389
2390         mlog_exit_void();
2391 }
2392
2393 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2394  * panic(). We do not support continue-on-error operation. */
2395 static void ocfs2_handle_error(struct super_block *sb)
2396 {
2397         struct ocfs2_super *osb = OCFS2_SB(sb);
2398
2399         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2400                 panic("OCFS2: (device %s): panic forced after error\n",
2401                       sb->s_id);
2402
2403         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2404
2405         if (sb->s_flags & MS_RDONLY &&
2406             (ocfs2_is_soft_readonly(osb) ||
2407              ocfs2_is_hard_readonly(osb)))
2408                 return;
2409
2410         printk(KERN_CRIT "File system is now read-only due to the potential "
2411                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2412                "system is unmounted.\n");
2413         sb->s_flags |= MS_RDONLY;
2414         ocfs2_set_ro_flag(osb, 0);
2415 }
2416
2417 static char error_buf[1024];
2418
2419 void __ocfs2_error(struct super_block *sb,
2420                    const char *function,
2421                    const char *fmt, ...)
2422 {
2423         va_list args;
2424
2425         va_start(args, fmt);
2426         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2427         va_end(args);
2428
2429         /* Not using mlog here because we want to show the actual
2430          * function the error came from. */
2431         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2432                sb->s_id, function, error_buf);
2433
2434         ocfs2_handle_error(sb);
2435 }
2436
2437 /* Handle critical errors. This is intentionally more drastic than
2438  * ocfs2_handle_error, so we only use for things like journal errors,
2439  * etc. */
2440 void __ocfs2_abort(struct super_block* sb,
2441                    const char *function,
2442                    const char *fmt, ...)
2443 {
2444         va_list args;
2445
2446         va_start(args, fmt);
2447         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2448         va_end(args);
2449
2450         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2451                sb->s_id, function, error_buf);
2452
2453         /* We don't have the cluster support yet to go straight to
2454          * hard readonly in here. Until then, we want to keep
2455          * ocfs2_abort() so that we can at least mark critical
2456          * errors.
2457          *
2458          * TODO: This should abort the journal and alert other nodes
2459          * that our slot needs recovery. */
2460
2461         /* Force a panic(). This stinks, but it's better than letting
2462          * things continue without having a proper hard readonly
2463          * here. */
2464         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2465         ocfs2_handle_error(sb);
2466 }
2467
2468 module_init(ocfs2_init);
2469 module_exit(ocfs2_exit);