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         struct ocfs2_cluster_connection *cconn = osb->cconn;
 209         struct ocfs2_recovery_map *rm = osb->recovery_map;
 210         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 211         int i, out = 0;
 212
 213         out += snprintf(buf + out, len - out,
 214                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 215                         "Device", osb->dev_str, osb->uuid_str,
 216                         osb->fs_generation, osb->vol_label);
 217
 218         out += snprintf(buf + out, len - out,
 219                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 220                         atomic_read(&osb->vol_state), osb->osb_flags);
 221
 222         out += snprintf(buf + out, len - out,
 223                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 224                         osb->sb->s_blocksize, osb->s_clustersize);
 225
 226         out += snprintf(buf + out, len - out,
 227                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 228                         "ROcompat: 0x%X\n",
 229                         "Features", osb->s_feature_compat,
 230                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 231
 232         out += snprintf(buf + out, len - out,
 233                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 234                         osb->s_mount_opt, osb->s_atime_quantum);
 235
 236         if (cconn) {
 237                 out += snprintf(buf + out, len - out,
 238                                 "%10s => Stack: %s  Name: %*s  "
 239                                 "Version: %d.%d\n", "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,
 244                                 cconn->cc_version.pv_minor);
 245         }
 246
 247         spin_lock(&osb->dc_task_lock);
 248         out += snprintf(buf + out, len - out,
 249                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 250                         "WorkSeq: %lu\n", "DownCnvt",
 251                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 252                         osb->blocked_lock_count, osb->dc_wake_sequence,
 253                         osb->dc_work_sequence);
 254         spin_unlock(&osb->dc_task_lock);
 255
 256         spin_lock(&osb->osb_lock);
 257         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 258                         "Recovery",
 259                         (osb->recovery_thread_task ?
 260                          task_pid_nr(osb->recovery_thread_task) : -1));
 261         if (rm->rm_used == 0)
 262                 out += snprintf(buf + out, len - out, " None\n");
 263         else {
 264                 for (i = 0; i < rm->rm_used; i++)
 265                         out += snprintf(buf + out, len - out, " %d",
 266                                         rm->rm_entries[i]);
 267                 out += snprintf(buf + out, len - out, "\n");
 268         }
 269         spin_unlock(&osb->osb_lock);
 270
 271         out += snprintf(buf + out, len - out,
 272                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 273                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 274                         osb->osb_commit_interval,
 275                         atomic_read(&osb->needs_checkpoint));
 276
 277         out += snprintf(buf + out, len - out,
 278                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 279                         "Journal", osb->journal->j_state,
 280                         osb->journal->j_trans_id,
 281                         atomic_read(&osb->journal->j_num_trans));
 282
 283         out += snprintf(buf + out, len - out,
 284                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 285                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 286                         "Stats",
 287                         atomic_read(&osb->alloc_stats.bitmap_data),
 288                         atomic_read(&osb->alloc_stats.local_data),
 289                         atomic_read(&osb->alloc_stats.bg_allocs),
 290                         atomic_read(&osb->alloc_stats.moves),
 291                         atomic_read(&osb->alloc_stats.bg_extends));
 292
 293         out += snprintf(buf + out, len - out,
 294                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 295                         "Default: %u bits\n",
 296                         "LocalAlloc", osb->local_alloc_state,
 297                         (unsigned long long)osb->la_last_gd,
 298                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 299
 300         spin_lock(&osb->osb_lock);
 301         out += snprintf(buf + out, len - out,
 302                         "%10s => Slot: %d  NumStolen: %d\n", "Steal",
 303                         osb->s_inode_steal_slot,
 304                         atomic_read(&osb->s_num_inodes_stolen));
 305         spin_unlock(&osb->osb_lock);
 306
 307         out += snprintf(buf + out, len - out, "OrphanScan => ");
 308         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 309                         os->os_count, os->os_seqno);
 310         out += snprintf(buf + out, len - out, " Last Scan: ");
 311         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 312                 out += snprintf(buf + out, len - out, "Disabled\n");
 313         else
 314                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 315                                 (get_seconds() - os->os_scantime.tv_sec));
 316
 317         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 318                         "Slots", "Num", "RecoGen");
 319         for (i = 0; i < osb->max_slots; ++i) {
 320                 out += snprintf(buf + out, len - out,
 321                                 "%10s  %c %3d  %10d\n",
 322                                 " ",
 323                                 (i == osb->slot_num ? '*' : ' '),
 324                                 i, osb->slot_recovery_generations[i]);
 325         }
 326
 327         return out;
 328 }
 329
 330 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 331 {
 332         struct ocfs2_super *osb = inode->i_private;
 333         char *buf = NULL;
 334
 335         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 336         if (!buf)
 337                 goto bail;
 338
 339         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 340
 341         file->private_data = buf;
 342
 343         return 0;
 344 bail:
 345         return -ENOMEM;
 346 }
 347
 348 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 349 {
 350         kfree(file->private_data);
 351         return 0;
 352 }
 353
 354 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 355                                 size_t nbytes, loff_t *ppos)
 356 {
 357         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 358                                        i_size_read(file->f_mapping->host));
 359 }
 360 #else
 361 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 362 {
 363         return 0;
 364 }
 365 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 366 {
 367         return 0;
 368 }
 369 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 370                                 size_t nbytes, loff_t *ppos)
 371 {
 372         return 0;
 373 }
 374 #endif  /* CONFIG_DEBUG_FS */
 375
 376 static struct file_operations ocfs2_osb_debug_fops = {
 377         .open =         ocfs2_osb_debug_open,
 378         .release =      ocfs2_debug_release,
 379         .read =         ocfs2_debug_read,
 380         .llseek =       generic_file_llseek,
 381 };
 382
 383 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 384 {
 385         int status;
 386         tid_t target;
 387         struct ocfs2_super *osb = OCFS2_SB(sb);
 388
 389         if (ocfs2_is_hard_readonly(osb))
 390                 return -EROFS;
 391
 392         if (wait) {
 393                 status = ocfs2_flush_truncate_log(osb);
 394                 if (status < 0)
 395                         mlog_errno(status);
 396         } else {
 397                 ocfs2_schedule_truncate_log_flush(osb, 0);
 398         }
 399
 400         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 401                                       &target)) {
 402                 if (wait)
 403                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 404                                              target);
 405         }
 406         return 0;
 407 }
 408
 409 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 410 {
 411         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 412             && (ino == USER_QUOTA_SYSTEM_INODE
 413                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 414                 return 0;
 415         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 416             && (ino == GROUP_QUOTA_SYSTEM_INODE
 417                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 418                 return 0;
 419         return 1;
 420 }
 421
 422 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 423 {
 424         struct inode *new = NULL;
 425         int status = 0;
 426         int i;
 427
 428         mlog_entry_void();
 429
 430         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 431         if (IS_ERR(new)) {
 432                 status = PTR_ERR(new);
 433                 mlog_errno(status);
 434                 goto bail;
 435         }
 436         osb->root_inode = new;
 437
 438         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 439         if (IS_ERR(new)) {
 440                 status = PTR_ERR(new);
 441                 mlog_errno(status);
 442                 goto bail;
 443         }
 444         osb->sys_root_inode = new;
 445
 446         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 447              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 448                 if (!ocfs2_need_system_inode(osb, i))
 449                         continue;
 450                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 451                 if (!new) {
 452                         ocfs2_release_system_inodes(osb);
 453                         status = -EINVAL;
 454                         mlog_errno(status);
 455                         /* FIXME: Should ERROR_RO_FS */
 456                         mlog(ML_ERROR, "Unable to load system inode %d, "
 457                              "possibly corrupt fs?", i);
 458                         goto bail;
 459                 }
 460                 // the array now has one ref, so drop this one
 461                 iput(new);
 462         }
 463
 464 bail:
 465         mlog_exit(status);
 466         return status;
 467 }
 468
 469 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 470 {
 471         struct inode *new = NULL;
 472         int status = 0;
 473         int i;
 474
 475         mlog_entry_void();
 476
 477         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 478              i < NUM_SYSTEM_INODES;
 479              i++) {
 480                 if (!ocfs2_need_system_inode(osb, i))
 481                         continue;
 482                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 483                 if (!new) {
 484                         ocfs2_release_system_inodes(osb);
 485                         status = -EINVAL;
 486                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 487                              status, i, osb->slot_num);
 488                         goto bail;
 489                 }
 490                 /* the array now has one ref, so drop this one */
 491                 iput(new);
 492         }
 493
 494 bail:
 495         mlog_exit(status);
 496         return status;
 497 }
 498
 499 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 500 {
 501         int i;
 502         struct inode *inode;
 503
 504         mlog_entry_void();
 505
 506         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 507                 inode = osb->system_inodes[i];
 508                 if (inode) {
 509                         iput(inode);
 510                         osb->system_inodes[i] = NULL;
 511                 }
 512         }
 513
 514         inode = osb->sys_root_inode;
 515         if (inode) {
 516                 iput(inode);
 517                 osb->sys_root_inode = NULL;
 518         }
 519
 520         inode = osb->root_inode;
 521         if (inode) {
 522                 iput(inode);
 523                 osb->root_inode = NULL;
 524         }
 525
 526         mlog_exit(0);
 527 }
 528
 529 /* We're allocating fs objects, use GFP_NOFS */
 530 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 531 {
 532         struct ocfs2_inode_info *oi;
 533
 534         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 535         if (!oi)
 536                 return NULL;
 537
 538         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 539         return &oi->vfs_inode;
 540 }
 541
 542 static void ocfs2_destroy_inode(struct inode *inode)
 543 {
 544         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 545 }
 546
 547 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 548                                                 unsigned int cbits)
 549 {
 550         unsigned int bytes = 1 << cbits;
 551         unsigned int trim = bytes;
 552         unsigned int bitshift = 32;
 553
 554         /*
 555          * i_size and all block offsets in ocfs2 are always 64 bits
 556          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 557          * 64 bit platforms, cluster size will be the limiting factor.
 558          */
 559
 560 #if BITS_PER_LONG == 32
 561 # if defined(CONFIG_LBDAF)
 562         BUILD_BUG_ON(sizeof(sector_t) != 8);
 563         /*
 564          * We might be limited by page cache size.
 565          */
 566         if (bytes > PAGE_CACHE_SIZE) {
 567                 bytes = PAGE_CACHE_SIZE;
 568                 trim = 1;
 569                 /*
 570                  * Shift by 31 here so that we don't get larger than
 571                  * MAX_LFS_FILESIZE
 572                  */
 573                 bitshift = 31;
 574         }
 575 # else
 576         /*
 577          * We are limited by the size of sector_t. Use block size, as
 578          * that's what we expose to the VFS.
 579          */
 580         bytes = 1 << bbits;
 581         trim = 1;
 582         bitshift = 31;
 583 # endif
 584 #endif
 585
 586         /*
 587          * Trim by a whole cluster when we can actually approach the
 588          * on-disk limits. Otherwise we can overflow i_clusters when
 589          * an extent start is at the max offset.
 590          */
 591         return (((unsigned long long)bytes) << bitshift) - trim;
 592 }
 593
 594 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 595 {
 596         int incompat_features;
 597         int ret = 0;
 598         struct mount_options parsed_options;
 599         struct ocfs2_super *osb = OCFS2_SB(sb);
 600
 601         lock_kernel();
 602
 603         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 604                 ret = -EINVAL;
 605                 goto out;
 606         }
 607
 608         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 609             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 610                 ret = -EINVAL;
 611                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 612                 goto out;
 613         }
 614
 615         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 616             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 617                 ret = -EINVAL;
 618                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 619                 goto out;
 620         }
 621
 622         /* Probably don't want this on remount; it might
 623          * mess with other nodes */
 624         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 625             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 626                 ret = -EINVAL;
 627                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 628                 goto out;
 629         }
 630
 631         /* We're going to/from readonly mode. */
 632         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 633                 /* Disable quota accounting before remounting RO */
 634                 if (*flags & MS_RDONLY) {
 635                         ret = ocfs2_susp_quotas(osb, 0);
 636                         if (ret < 0)
 637                                 goto out;
 638                 }
 639                 /* Lock here so the check of HARD_RO and the potential
 640                  * setting of SOFT_RO is atomic. */
 641                 spin_lock(&osb->osb_lock);
 642                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 643                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 644                         ret = -EROFS;
 645                         goto unlock_osb;
 646                 }
 647
 648                 if (*flags & MS_RDONLY) {
 649                         mlog(0, "Going to ro mode.\n");
 650                         sb->s_flags |= MS_RDONLY;
 651                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 652                 } else {
 653                         mlog(0, "Making ro filesystem writeable.\n");
 654
 655                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 656                                 mlog(ML_ERROR, "Cannot remount RDWR "
 657                                      "filesystem due to previous errors.\n");
 658                                 ret = -EROFS;
 659                                 goto unlock_osb;
 660                         }
 661                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 662                         if (incompat_features) {
 663                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 664                                      "of unsupported optional features "
 665                                      "(%x).\n", incompat_features);
 666                                 ret = -EINVAL;
 667                                 goto unlock_osb;
 668                         }
 669                         sb->s_flags &= ~MS_RDONLY;
 670                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 671                 }
 672 unlock_osb:
 673                 spin_unlock(&osb->osb_lock);
 674                 /* Enable quota accounting after remounting RW */
 675                 if (!ret && !(*flags & MS_RDONLY)) {
 676                         if (sb_any_quota_suspended(sb))
 677                                 ret = ocfs2_susp_quotas(osb, 1);
 678                         else
 679                                 ret = ocfs2_enable_quotas(osb);
 680                         if (ret < 0) {
 681                                 /* Return back changes... */
 682                                 spin_lock(&osb->osb_lock);
 683                                 sb->s_flags |= MS_RDONLY;
 684                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 685                                 spin_unlock(&osb->osb_lock);
 686                                 goto out;
 687                         }
 688                 }
 689         }
 690
 691         if (!ret) {
 692                 /* Only save off the new mount options in case of a successful
 693                  * remount. */
 694                 if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 695                         parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 696                 osb->s_mount_opt = parsed_options.mount_opt;
 697                 osb->s_atime_quantum = parsed_options.atime_quantum;
 698                 osb->preferred_slot = parsed_options.slot;
 699                 if (parsed_options.commit_interval)
 700                         osb->osb_commit_interval = parsed_options.commit_interval;
 701
 702                 if (!ocfs2_is_hard_readonly(osb))
 703                         ocfs2_set_journal_params(osb);
 704         }
 705 out:
 706         unlock_kernel();
 707         return ret;
 708 }
 709
 710 static int ocfs2_sb_probe(struct super_block *sb,
 711                           struct buffer_head **bh,
 712                           int *sector_size,
 713                           struct ocfs2_blockcheck_stats *stats)
 714 {
 715         int status, tmpstat;
 716         struct ocfs1_vol_disk_hdr *hdr;
 717         struct ocfs2_dinode *di;
 718         int blksize;
 719
 720         *bh = NULL;
 721
 722         /* may be > 512 */
 723         *sector_size = bdev_logical_block_size(sb->s_bdev);
 724         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 725                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 726                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 727                 status = -EINVAL;
 728                 goto bail;
 729         }
 730
 731         /* Can this really happen? */
 732         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 733                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 734
 735         /* check block zero for old format */
 736         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 737         if (status < 0) {
 738                 mlog_errno(status);
 739                 goto bail;
 740         }
 741         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 742         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 743                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 744                      hdr->major_version, hdr->minor_version);
 745                 status = -EINVAL;
 746         }
 747         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 748                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 749                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 750                      hdr->signature);
 751                 status = -EINVAL;
 752         }
 753         brelse(*bh);
 754         *bh = NULL;
 755         if (status < 0) {
 756                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 757                      "upgraded before mounting with ocfs v2\n");
 758                 goto bail;
 759         }
 760
 761         /*
 762          * Now check at magic offset for 512, 1024, 2048, 4096
 763          * blocksizes.  4096 is the maximum blocksize because it is
 764          * the minimum clustersize.
 765          */
 766         status = -EINVAL;
 767         for (blksize = *sector_size;
 768              blksize <= OCFS2_MAX_BLOCKSIZE;
 769              blksize <<= 1) {
 770                 tmpstat = ocfs2_get_sector(sb, bh,
 771                                            OCFS2_SUPER_BLOCK_BLKNO,
 772                                            blksize);
 773                 if (tmpstat < 0) {
 774                         status = tmpstat;
 775                         mlog_errno(status);
 776                         goto bail;
 777                 }
 778                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 779                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 780                 status = ocfs2_verify_volume(di, *bh, blksize, stats);
 781                 if (status >= 0)
 782                         goto bail;
 783                 brelse(*bh);
 784                 *bh = NULL;
 785                 if (status != -EAGAIN)
 786                         break;
 787         }
 788
 789 bail:
 790         return status;
 791 }
 792
 793 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 794 {
 795         if (ocfs2_mount_local(osb)) {
 796                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 797                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 798                              "mounted device.\n");
 799                         return -EINVAL;
 800                 }
 801         }
 802
 803         if (ocfs2_userspace_stack(osb)) {
 804                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 805                         mlog(ML_ERROR, "Userspace stack expected, but "
 806                              "o2cb heartbeat arguments passed to mount\n");
 807                         return -EINVAL;
 808                 }
 809         }
 810
 811         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 812                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 813                     !ocfs2_userspace_stack(osb)) {
 814                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 815                              "a read-write clustered device.\n");
 816                         return -EINVAL;
 817                 }
 818         }
 819
 820         return 0;
 821 }
 822
 823 /*
 824  * If we're using a userspace stack, mount should have passed
 825  * a name that matches the disk.  If not, mount should not
 826  * have passed a stack.
 827  */
 828 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 829                                         struct mount_options *mopt)
 830 {
 831         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 832                 mlog(ML_ERROR,
 833                      "cluster stack passed to mount, but this filesystem "
 834                      "does not support it\n");
 835                 return -EINVAL;
 836         }
 837
 838         if (ocfs2_userspace_stack(osb) &&
 839             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 840                     OCFS2_STACK_LABEL_LEN)) {
 841                 mlog(ML_ERROR,
 842                      "cluster stack passed to mount (\"%s\") does not "
 843                      "match the filesystem (\"%s\")\n",
 844                      mopt->cluster_stack,
 845                      osb->osb_cluster_stack);
 846                 return -EINVAL;
 847         }
 848
 849         return 0;
 850 }
 851
 852 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 853 {
 854         int type;
 855         struct super_block *sb = osb->sb;
 856         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 857                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 858         int status = 0;
 859
 860         for (type = 0; type < MAXQUOTAS; type++) {
 861                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 862                         continue;
 863                 if (unsuspend)
 864                         status = vfs_quota_enable(
 865                                         sb_dqopt(sb)->files[type],
 866                                         type, QFMT_OCFS2,
 867                                         DQUOT_SUSPENDED);
 868                 else
 869                         status = vfs_quota_disable(sb, type,
 870                                                    DQUOT_SUSPENDED);
 871                 if (status < 0)
 872                         break;
 873         }
 874         if (status < 0)
 875                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 876                      "remount (error = %d).\n", status);
 877         return status;
 878 }
 879
 880 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 881 {
 882         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 883         struct super_block *sb = osb->sb;
 884         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 885                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 886         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 887                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 888         int status;
 889         int type;
 890
 891         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 892         for (type = 0; type < MAXQUOTAS; type++) {
 893                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 894                         continue;
 895                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 896                                                         osb->slot_num);
 897                 if (!inode[type]) {
 898                         status = -ENOENT;
 899                         goto out_quota_off;
 900                 }
 901                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 902                                                 DQUOT_USAGE_ENABLED);
 903                 if (status < 0)
 904                         goto out_quota_off;
 905         }
 906
 907         for (type = 0; type < MAXQUOTAS; type++)
 908                 iput(inode[type]);
 909         return 0;
 910 out_quota_off:
 911         ocfs2_disable_quotas(osb);
 912         for (type = 0; type < MAXQUOTAS; type++)
 913                 iput(inode[type]);
 914         mlog_errno(status);
 915         return status;
 916 }
 917
 918 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 919 {
 920         int type;
 921         struct inode *inode;
 922         struct super_block *sb = osb->sb;
 923
 924         /* We mostly ignore errors in this function because there's not much
 925          * we can do when we see them */
 926         for (type = 0; type < MAXQUOTAS; type++) {
 927                 if (!sb_has_quota_loaded(sb, type))
 928                         continue;
 929                 inode = igrab(sb->s_dquot.files[type]);
 930                 /* Turn off quotas. This will remove all dquot structures from
 931                  * memory and so they will be automatically synced to global
 932                  * quota files */
 933                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 934                                             DQUOT_LIMITS_ENABLED);
 935                 if (!inode)
 936                         continue;
 937                 iput(inode);
 938         }
 939 }
 940
 941 /* Handle quota on quotactl */
 942 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 943                           char *path, int remount)
 944 {
 945         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 946                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 947
 948         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 949                 return -EINVAL;
 950
 951         if (remount)
 952                 return 0;       /* Just ignore it has been handled in
 953                                  * ocfs2_remount() */
 954         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 955                                     format_id, DQUOT_LIMITS_ENABLED);
 956 }
 957
 958 /* Handle quota off quotactl */
 959 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 960 {
 961         if (remount)
 962                 return 0;       /* Ignore now and handle later in
 963                                  * ocfs2_remount() */
 964         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 965 }
 966
 967 static struct quotactl_ops ocfs2_quotactl_ops = {
 968         .quota_on       = ocfs2_quota_on,
 969         .quota_off      = ocfs2_quota_off,
 970         .quota_sync     = vfs_quota_sync,
 971         .get_info       = vfs_get_dqinfo,
 972         .set_info       = vfs_set_dqinfo,
 973         .get_dqblk      = vfs_get_dqblk,
 974         .set_dqblk      = vfs_set_dqblk,
 975 };
 976
 977 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 978 {
 979         struct dentry *root;
 980         int status, sector_size;
 981         struct mount_options parsed_options;
 982         struct inode *inode = NULL;
 983         struct ocfs2_super *osb = NULL;
 984         struct buffer_head *bh = NULL;
 985         char nodestr[8];
 986         struct ocfs2_blockcheck_stats stats;
 987
 988         mlog_entry("%p, %p, %i", sb, data, silent);
 989
 990         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 991                 status = -EINVAL;
 992                 goto read_super_error;
 993         }
 994
 995         /* probe for superblock */
 996         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
 997         if (status < 0) {
 998                 mlog(ML_ERROR, "superblock probe failed!\n");
 999                 goto read_super_error;
1000         }
1001
1002         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1003         osb = OCFS2_SB(sb);
1004         if (status < 0) {
1005                 mlog_errno(status);
1006                 goto read_super_error;
1007         }
1008         brelse(bh);
1009         bh = NULL;
1010
1011         if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
1012                 parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1013
1014         osb->s_mount_opt = parsed_options.mount_opt;
1015         osb->s_atime_quantum = parsed_options.atime_quantum;
1016         osb->preferred_slot = parsed_options.slot;
1017         osb->osb_commit_interval = parsed_options.commit_interval;
1018         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1019         osb->local_alloc_bits = osb->local_alloc_default_bits;
1020         if (osb->s_mount_opt & OCFS2_MOUNT_USRQUOTA &&
1021             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1022                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1023                 status = -EINVAL;
1024                 mlog(ML_ERROR, "User quotas were requested, but this "
1025                      "filesystem does not have the feature enabled.\n");
1026                 goto read_super_error;
1027         }
1028         if (osb->s_mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1029             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1030                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1031                 status = -EINVAL;
1032                 mlog(ML_ERROR, "Group quotas were requested, but this "
1033                      "filesystem does not have the feature enabled.\n");
1034                 goto read_super_error;
1035         }
1036
1037         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1038         if (status)
1039                 goto read_super_error;
1040
1041         sb->s_magic = OCFS2_SUPER_MAGIC;
1042
1043         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1044                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1045
1046         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1047          * heartbeat=none */
1048         if (bdev_read_only(sb->s_bdev)) {
1049                 if (!(sb->s_flags & MS_RDONLY)) {
1050                         status = -EACCES;
1051                         mlog(ML_ERROR, "Readonly device detected but readonly "
1052                              "mount was not specified.\n");
1053                         goto read_super_error;
1054                 }
1055
1056                 /* You should not be able to start a local heartbeat
1057                  * on a readonly device. */
1058                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1059                         status = -EROFS;
1060                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1061                              "device.\n");
1062                         goto read_super_error;
1063                 }
1064
1065                 status = ocfs2_check_journals_nolocks(osb);
1066                 if (status < 0) {
1067                         if (status == -EROFS)
1068                                 mlog(ML_ERROR, "Recovery required on readonly "
1069                                      "file system, but write access is "
1070                                      "unavailable.\n");
1071                         else
1072                                 mlog_errno(status);
1073                         goto read_super_error;
1074                 }
1075
1076                 ocfs2_set_ro_flag(osb, 1);
1077
1078                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1079                        "services will be utilized for this mount. Recovery "
1080                        "will be skipped.\n");
1081         }
1082
1083         if (!ocfs2_is_hard_readonly(osb)) {
1084                 if (sb->s_flags & MS_RDONLY)
1085                         ocfs2_set_ro_flag(osb, 0);
1086         }
1087
1088         status = ocfs2_verify_heartbeat(osb);
1089         if (status < 0) {
1090                 mlog_errno(status);
1091                 goto read_super_error;
1092         }
1093
1094         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1095                                                  ocfs2_debugfs_root);
1096         if (!osb->osb_debug_root) {
1097                 status = -EINVAL;
1098                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1099                 goto read_super_error;
1100         }
1101
1102         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1103                                             osb->osb_debug_root,
1104                                             osb,
1105                                             &ocfs2_osb_debug_fops);
1106         if (!osb->osb_ctxt) {
1107                 status = -EINVAL;
1108                 mlog_errno(status);
1109                 goto read_super_error;
1110         }
1111
1112         if (ocfs2_meta_ecc(osb)) {
1113                 status = ocfs2_blockcheck_stats_debugfs_install(
1114                                                 &osb->osb_ecc_stats,
1115                                                 osb->osb_debug_root);
1116                 if (status) {
1117                         mlog(ML_ERROR,
1118                              "Unable to create blockcheck statistics "
1119                              "files\n");
1120                         goto read_super_error;
1121                 }
1122         }
1123
1124         status = ocfs2_mount_volume(sb);
1125         if (osb->root_inode)
1126                 inode = igrab(osb->root_inode);
1127
1128         if (status < 0)
1129                 goto read_super_error;
1130
1131         if (!inode) {
1132                 status = -EIO;
1133                 mlog_errno(status);
1134                 goto read_super_error;
1135         }
1136
1137         root = d_alloc_root(inode);
1138         if (!root) {
1139                 status = -ENOMEM;
1140                 mlog_errno(status);
1141                 goto read_super_error;
1142         }
1143
1144         sb->s_root = root;
1145
1146         ocfs2_complete_mount_recovery(osb);
1147
1148         if (ocfs2_mount_local(osb))
1149                 snprintf(nodestr, sizeof(nodestr), "local");
1150         else
1151                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1152
1153         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1154                "with %s data mode.\n",
1155                osb->dev_str, nodestr, osb->slot_num,
1156                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1157                "ordered");
1158
1159         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1160         wake_up(&osb->osb_mount_event);
1161
1162         /* Now we can initialize quotas because we can afford to wait
1163          * for cluster locks recovery now. That also means that truncation
1164          * log recovery can happen but that waits for proper quota setup */
1165         if (!(sb->s_flags & MS_RDONLY)) {
1166                 status = ocfs2_enable_quotas(osb);
1167                 if (status < 0) {
1168                         /* We have to err-out specially here because
1169                          * s_root is already set */
1170                         mlog_errno(status);
1171                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1172                         wake_up(&osb->osb_mount_event);
1173                         mlog_exit(status);
1174                         return status;
1175                 }
1176         }
1177
1178         ocfs2_complete_quota_recovery(osb);
1179
1180         /* Now we wake up again for processes waiting for quotas */
1181         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1182         wake_up(&osb->osb_mount_event);
1183
1184         /* Start this when the mount is almost sure of being successful */
1185         ocfs2_orphan_scan_init(osb);
1186
1187         mlog_exit(status);
1188         return status;
1189
1190 read_super_error:
1191         brelse(bh);
1192
1193         if (inode)
1194                 iput(inode);
1195
1196         if (osb) {
1197                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1198                 wake_up(&osb->osb_mount_event);
1199                 ocfs2_dismount_volume(sb, 1);
1200         }
1201
1202         mlog_exit(status);
1203         return status;
1204 }
1205
1206 static int ocfs2_get_sb(struct file_system_type *fs_type,
1207                         int flags,
1208                         const char *dev_name,
1209                         void *data,
1210                         struct vfsmount *mnt)
1211 {
1212         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1213                            mnt);
1214 }
1215
1216 static struct file_system_type ocfs2_fs_type = {
1217         .owner          = THIS_MODULE,
1218         .name           = "ocfs2",
1219         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1220                                         * the fs? */
1221         .kill_sb        = kill_block_super, /* set to the generic one
1222                                              * right now, but do we
1223                                              * need to change that? */
1224         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1225         .next           = NULL
1226 };
1227
1228 static int ocfs2_parse_options(struct super_block *sb,
1229                                char *options,
1230                                struct mount_options *mopt,
1231                                int is_remount)
1232 {
1233         int status;
1234         char *p;
1235
1236         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1237                    options ? options : "(none)");
1238
1239         mopt->commit_interval = 0;
1240         mopt->mount_opt = 0;
1241         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1242         mopt->slot = OCFS2_INVALID_SLOT;
1243         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1244         mopt->cluster_stack[0] = '\0';
1245
1246         if (!options) {
1247                 status = 1;
1248                 goto bail;
1249         }
1250
1251         while ((p = strsep(&options, ",")) != NULL) {
1252                 int token, option;
1253                 substring_t args[MAX_OPT_ARGS];
1254
1255                 if (!*p)
1256                         continue;
1257
1258                 token = match_token(p, tokens, args);
1259                 switch (token) {
1260                 case Opt_hb_local:
1261                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1262                         break;
1263                 case Opt_hb_none:
1264                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1265                         break;
1266                 case Opt_barrier:
1267                         if (match_int(&args[0], &option)) {
1268                                 status = 0;
1269                                 goto bail;
1270                         }
1271                         if (option)
1272                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1273                         else
1274                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1275                         break;
1276                 case Opt_intr:
1277                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1278                         break;
1279                 case Opt_nointr:
1280                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1281                         break;
1282                 case Opt_err_panic:
1283                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1284                         break;
1285                 case Opt_err_ro:
1286                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1287                         break;
1288                 case Opt_data_ordered:
1289                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1290                         break;
1291                 case Opt_data_writeback:
1292                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1293                         break;
1294                 case Opt_user_xattr:
1295                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1296                         break;
1297                 case Opt_nouser_xattr:
1298                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1299                         break;
1300                 case Opt_atime_quantum:
1301                         if (match_int(&args[0], &option)) {
1302                                 status = 0;
1303                                 goto bail;
1304                         }
1305                         if (option >= 0)
1306                                 mopt->atime_quantum = option;
1307                         break;
1308                 case Opt_slot:
1309                         option = 0;
1310                         if (match_int(&args[0], &option)) {
1311                                 status = 0;
1312                                 goto bail;
1313                         }
1314                         if (option)
1315                                 mopt->slot = (s16)option;
1316                         break;
1317                 case Opt_commit:
1318                         option = 0;
1319                         if (match_int(&args[0], &option)) {
1320                                 status = 0;
1321                                 goto bail;
1322                         }
1323                         if (option < 0)
1324                                 return 0;
1325                         if (option == 0)
1326                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1327                         mopt->commit_interval = HZ * option;
1328                         break;
1329                 case Opt_localalloc:
1330                         option = 0;
1331                         if (match_int(&args[0], &option)) {
1332                                 status = 0;
1333                                 goto bail;
1334                         }
1335                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1336                                 mopt->localalloc_opt = option;
1337                         break;
1338                 case Opt_localflocks:
1339                         /*
1340                          * Changing this during remount could race
1341                          * flock() requests, or "unbalance" existing
1342                          * ones (e.g., a lock is taken in one mode but
1343                          * dropped in the other). If users care enough
1344                          * to flip locking modes during remount, we
1345                          * could add a "local" flag to individual
1346                          * flock structures for proper tracking of
1347                          * state.
1348                          */
1349                         if (!is_remount)
1350                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1351                         break;
1352                 case Opt_stack:
1353                         /* Check both that the option we were passed
1354                          * is of the right length and that it is a proper
1355                          * string of the right length.
1356                          */
1357                         if (((args[0].to - args[0].from) !=
1358                              OCFS2_STACK_LABEL_LEN) ||
1359                             (strnlen(args[0].from,
1360                                      OCFS2_STACK_LABEL_LEN) !=
1361                              OCFS2_STACK_LABEL_LEN)) {
1362                                 mlog(ML_ERROR,
1363                                      "Invalid cluster_stack option\n");
1364                                 status = 0;
1365                                 goto bail;
1366                         }
1367                         memcpy(mopt->cluster_stack, args[0].from,
1368                                OCFS2_STACK_LABEL_LEN);
1369                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1370                         break;
1371                 case Opt_inode64:
1372                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1373                         break;
1374                 case Opt_usrquota:
1375                         /* We check only on remount, otherwise features
1376                          * aren't yet initialized. */
1377                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1378                             OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1379                                 mlog(ML_ERROR, "User quota requested but "
1380                                      "filesystem feature is not set\n");
1381                                 status = 0;
1382                                 goto bail;
1383                         }
1384                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1385                         break;
1386                 case Opt_grpquota:
1387                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1388                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1389                                 mlog(ML_ERROR, "Group quota requested but "
1390                                      "filesystem feature is not set\n");
1391                                 status = 0;
1392                                 goto bail;
1393                         }
1394                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1395                         break;
1396 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1397                 case Opt_acl:
1398                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1399                         break;
1400                 case Opt_noacl:
1401                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1402                         break;
1403 #else
1404                 case Opt_acl:
1405                 case Opt_noacl:
1406                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
1407                         break;
1408 #endif
1409                 default:
1410                         mlog(ML_ERROR,
1411                              "Unrecognized mount option \"%s\" "
1412                              "or missing value\n", p);
1413                         status = 0;
1414                         goto bail;
1415                 }
1416         }
1417
1418         status = 1;
1419
1420 bail:
1421         mlog_exit(status);
1422         return status;
1423 }
1424
1425 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1426 {
1427         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1428         unsigned long opts = osb->s_mount_opt;
1429         unsigned int local_alloc_megs;
1430
1431         if (opts & OCFS2_MOUNT_HB_LOCAL)
1432                 seq_printf(s, ",_netdev,heartbeat=local");
1433         else
1434                 seq_printf(s, ",heartbeat=none");
1435
1436         if (opts & OCFS2_MOUNT_NOINTR)
1437                 seq_printf(s, ",nointr");
1438
1439         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1440                 seq_printf(s, ",data=writeback");
1441         else
1442                 seq_printf(s, ",data=ordered");
1443
1444         if (opts & OCFS2_MOUNT_BARRIER)
1445                 seq_printf(s, ",barrier=1");
1446
1447         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1448                 seq_printf(s, ",errors=panic");
1449         else
1450                 seq_printf(s, ",errors=remount-ro");
1451
1452         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1453                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1454
1455         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1456                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1457
1458         if (osb->osb_commit_interval)
1459                 seq_printf(s, ",commit=%u",
1460                            (unsigned) (osb->osb_commit_interval / HZ));
1461
1462         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1463         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1464                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1465
1466         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1467                 seq_printf(s, ",localflocks,");
1468
1469         if (osb->osb_cluster_stack[0])
1470                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1471                            osb->osb_cluster_stack);
1472         if (opts & OCFS2_MOUNT_USRQUOTA)
1473                 seq_printf(s, ",usrquota");
1474         if (opts & OCFS2_MOUNT_GRPQUOTA)
1475                 seq_printf(s, ",grpquota");
1476
1477         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1478                 seq_printf(s, ",nouser_xattr");
1479         else
1480                 seq_printf(s, ",user_xattr");
1481
1482         if (opts & OCFS2_MOUNT_INODE64)
1483                 seq_printf(s, ",inode64");
1484
1485 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1486         if (opts & OCFS2_MOUNT_POSIX_ACL)
1487                 seq_printf(s, ",acl");
1488         else
1489                 seq_printf(s, ",noacl");
1490 #endif
1491
1492         return 0;
1493 }
1494
1495 static int __init ocfs2_init(void)
1496 {
1497         int status;
1498
1499         mlog_entry_void();
1500
1501         ocfs2_print_version();
1502
1503         status = init_ocfs2_uptodate_cache();
1504         if (status < 0) {
1505                 mlog_errno(status);
1506                 goto leave;
1507         }
1508
1509         status = ocfs2_initialize_mem_caches();
1510         if (status < 0) {
1511                 mlog_errno(status);
1512                 goto leave;
1513         }
1514
1515         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1516         if (!ocfs2_wq) {
1517                 status = -ENOMEM;
1518                 goto leave;
1519         }
1520
1521         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1522         if (!ocfs2_debugfs_root) {
1523                 status = -EFAULT;
1524                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1525         }
1526
1527         status = ocfs2_quota_setup();
1528         if (status)
1529                 goto leave;
1530
1531         ocfs2_set_locking_protocol();
1532
1533         status = register_quota_format(&ocfs2_quota_format);
1534 leave:
1535         if (status < 0) {
1536                 ocfs2_quota_shutdown();
1537                 ocfs2_free_mem_caches();
1538                 exit_ocfs2_uptodate_cache();
1539         }
1540
1541         mlog_exit(status);
1542
1543         if (status >= 0) {
1544                 return register_filesystem(&ocfs2_fs_type);
1545         } else
1546                 return -1;
1547 }
1548
1549 static void __exit ocfs2_exit(void)
1550 {
1551         mlog_entry_void();
1552
1553         ocfs2_quota_shutdown();
1554
1555         if (ocfs2_wq) {
1556                 flush_workqueue(ocfs2_wq);
1557                 destroy_workqueue(ocfs2_wq);
1558         }
1559
1560         unregister_quota_format(&ocfs2_quota_format);
1561
1562         debugfs_remove(ocfs2_debugfs_root);
1563
1564         ocfs2_free_mem_caches();
1565
1566         unregister_filesystem(&ocfs2_fs_type);
1567
1568         exit_ocfs2_uptodate_cache();
1569
1570         mlog_exit_void();
1571 }
1572
1573 static void ocfs2_put_super(struct super_block *sb)
1574 {
1575         mlog_entry("(0x%p)\n", sb);
1576
1577         lock_kernel();
1578
1579         ocfs2_sync_blockdev(sb);
1580         ocfs2_dismount_volume(sb, 0);
1581
1582         unlock_kernel();
1583
1584         mlog_exit_void();
1585 }
1586
1587 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1588 {
1589         struct ocfs2_super *osb;
1590         u32 numbits, freebits;
1591         int status;
1592         struct ocfs2_dinode *bm_lock;
1593         struct buffer_head *bh = NULL;
1594         struct inode *inode = NULL;
1595
1596         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1597
1598         osb = OCFS2_SB(dentry->d_sb);
1599
1600         inode = ocfs2_get_system_file_inode(osb,
1601                                             GLOBAL_BITMAP_SYSTEM_INODE,
1602                                             OCFS2_INVALID_SLOT);
1603         if (!inode) {
1604                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1605                 status = -EIO;
1606                 goto bail;
1607         }
1608
1609         status = ocfs2_inode_lock(inode, &bh, 0);
1610         if (status < 0) {
1611                 mlog_errno(status);
1612                 goto bail;
1613         }
1614
1615         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1616
1617         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1618         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1619
1620         buf->f_type = OCFS2_SUPER_MAGIC;
1621         buf->f_bsize = dentry->d_sb->s_blocksize;
1622         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1623         buf->f_blocks = ((sector_t) numbits) *
1624                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1625         buf->f_bfree = ((sector_t) freebits) *
1626                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1627         buf->f_bavail = buf->f_bfree;
1628         buf->f_files = numbits;
1629         buf->f_ffree = freebits;
1630
1631         brelse(bh);
1632
1633         ocfs2_inode_unlock(inode, 0);
1634         status = 0;
1635 bail:
1636         if (inode)
1637                 iput(inode);
1638
1639         mlog_exit(status);
1640
1641         return status;
1642 }
1643
1644 static void ocfs2_inode_init_once(void *data)
1645 {
1646         struct ocfs2_inode_info *oi = data;
1647
1648         oi->ip_flags = 0;
1649         oi->ip_open_count = 0;
1650         spin_lock_init(&oi->ip_lock);
1651         ocfs2_extent_map_init(&oi->vfs_inode);
1652         INIT_LIST_HEAD(&oi->ip_io_markers);
1653         oi->ip_created_trans = 0;
1654         oi->ip_last_trans = 0;
1655         oi->ip_dir_start_lookup = 0;
1656
1657         init_rwsem(&oi->ip_alloc_sem);
1658         init_rwsem(&oi->ip_xattr_sem);
1659         mutex_init(&oi->ip_io_mutex);
1660
1661         oi->ip_blkno = 0ULL;
1662         oi->ip_clusters = 0;
1663
1664         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1665         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1666         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1667
1668         ocfs2_metadata_cache_init(&oi->vfs_inode);
1669
1670         inode_init_once(&oi->vfs_inode);
1671 }
1672
1673 static int ocfs2_initialize_mem_caches(void)
1674 {
1675         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1676                                        sizeof(struct ocfs2_inode_info),
1677                                        0,
1678                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1679                                                 SLAB_MEM_SPREAD),
1680                                        ocfs2_inode_init_once);
1681         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1682                                         sizeof(struct ocfs2_dquot),
1683                                         0,
1684                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1685                                                 SLAB_MEM_SPREAD),
1686                                         NULL);
1687         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1688                                         sizeof(struct ocfs2_quota_chunk),
1689                                         0,
1690                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1691                                         NULL);
1692         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1693             !ocfs2_qf_chunk_cachep) {
1694                 if (ocfs2_inode_cachep)
1695                         kmem_cache_destroy(ocfs2_inode_cachep);
1696                 if (ocfs2_dquot_cachep)
1697                         kmem_cache_destroy(ocfs2_dquot_cachep);
1698                 if (ocfs2_qf_chunk_cachep)
1699                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1700                 return -ENOMEM;
1701         }
1702
1703         return 0;
1704 }
1705
1706 static void ocfs2_free_mem_caches(void)
1707 {
1708         if (ocfs2_inode_cachep)
1709                 kmem_cache_destroy(ocfs2_inode_cachep);
1710         ocfs2_inode_cachep = NULL;
1711
1712         if (ocfs2_dquot_cachep)
1713                 kmem_cache_destroy(ocfs2_dquot_cachep);
1714         ocfs2_dquot_cachep = NULL;
1715
1716         if (ocfs2_qf_chunk_cachep)
1717                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1718         ocfs2_qf_chunk_cachep = NULL;
1719 }
1720
1721 static int ocfs2_get_sector(struct super_block *sb,
1722                             struct buffer_head **bh,
1723                             int block,
1724                             int sect_size)
1725 {
1726         if (!sb_set_blocksize(sb, sect_size)) {
1727                 mlog(ML_ERROR, "unable to set blocksize\n");
1728                 return -EIO;
1729         }
1730
1731         *bh = sb_getblk(sb, block);
1732         if (!*bh) {
1733                 mlog_errno(-EIO);
1734                 return -EIO;
1735         }
1736         lock_buffer(*bh);
1737         if (!buffer_dirty(*bh))
1738                 clear_buffer_uptodate(*bh);
1739         unlock_buffer(*bh);
1740         ll_rw_block(READ, 1, bh);
1741         wait_on_buffer(*bh);
1742         if (!buffer_uptodate(*bh)) {
1743                 mlog_errno(-EIO);
1744                 brelse(*bh);
1745                 *bh = NULL;
1746                 return -EIO;
1747         }
1748
1749         return 0;
1750 }
1751
1752 static int ocfs2_mount_volume(struct super_block *sb)
1753 {
1754         int status = 0;
1755         int unlock_super = 0;
1756         struct ocfs2_super *osb = OCFS2_SB(sb);
1757
1758         mlog_entry_void();
1759
1760         if (ocfs2_is_hard_readonly(osb))
1761                 goto leave;
1762
1763         status = ocfs2_dlm_init(osb);
1764         if (status < 0) {
1765                 mlog_errno(status);
1766                 goto leave;
1767         }
1768
1769         status = ocfs2_super_lock(osb, 1);
1770         if (status < 0) {
1771                 mlog_errno(status);
1772                 goto leave;
1773         }
1774         unlock_super = 1;
1775
1776         /* This will load up the node map and add ourselves to it. */
1777         status = ocfs2_find_slot(osb);
1778         if (status < 0) {
1779                 mlog_errno(status);
1780                 goto leave;
1781         }
1782
1783         /* load all node-local system inodes */
1784         status = ocfs2_init_local_system_inodes(osb);
1785         if (status < 0) {
1786                 mlog_errno(status);
1787                 goto leave;
1788         }
1789
1790         status = ocfs2_check_volume(osb);
1791         if (status < 0) {
1792                 mlog_errno(status);
1793                 goto leave;
1794         }
1795
1796         status = ocfs2_truncate_log_init(osb);
1797         if (status < 0)
1798                 mlog_errno(status);
1799
1800 leave:
1801         if (unlock_super)
1802                 ocfs2_super_unlock(osb, 1);
1803
1804         mlog_exit(status);
1805         return status;
1806 }
1807
1808 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1809 {
1810         int tmp, hangup_needed = 0;
1811         struct ocfs2_super *osb = NULL;
1812         char nodestr[8];
1813
1814         mlog_entry("(0x%p)\n", sb);
1815
1816         BUG_ON(!sb);
1817         osb = OCFS2_SB(sb);
1818         BUG_ON(!osb);
1819
1820         debugfs_remove(osb->osb_ctxt);
1821
1822         /* Orphan scan should be stopped as early as possible */
1823         ocfs2_orphan_scan_stop(osb);
1824
1825         ocfs2_disable_quotas(osb);
1826
1827         ocfs2_shutdown_local_alloc(osb);
1828
1829         ocfs2_truncate_log_shutdown(osb);
1830
1831         /* This will disable recovery and flush any recovery work. */
1832         ocfs2_recovery_exit(osb);
1833
1834         ocfs2_journal_shutdown(osb);
1835
1836         ocfs2_sync_blockdev(sb);
1837
1838         /* No cluster connection means we've failed during mount, so skip
1839          * all the steps which depended on that to complete. */
1840         if (osb->cconn) {
1841                 tmp = ocfs2_super_lock(osb, 1);
1842                 if (tmp < 0) {
1843                         mlog_errno(tmp);
1844                         return;
1845                 }
1846         }
1847
1848         if (osb->slot_num != OCFS2_INVALID_SLOT)
1849                 ocfs2_put_slot(osb);
1850
1851         if (osb->cconn)
1852                 ocfs2_super_unlock(osb, 1);
1853
1854         ocfs2_release_system_inodes(osb);
1855
1856         /*
1857          * If we're dismounting due to mount error, mount.ocfs2 will clean
1858          * up heartbeat.  If we're a local mount, there is no heartbeat.
1859          * If we failed before we got a uuid_str yet, we can't stop
1860          * heartbeat.  Otherwise, do it.
1861          */
1862         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1863                 hangup_needed = 1;
1864
1865         if (osb->cconn)
1866                 ocfs2_dlm_shutdown(osb, hangup_needed);
1867
1868         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1869         debugfs_remove(osb->osb_debug_root);
1870
1871         if (hangup_needed)
1872                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1873
1874         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1875
1876         if (ocfs2_mount_local(osb))
1877                 snprintf(nodestr, sizeof(nodestr), "local");
1878         else
1879                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1880
1881         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1882                osb->dev_str, nodestr);
1883
1884         ocfs2_delete_osb(osb);
1885         kfree(osb);
1886         sb->s_dev = 0;
1887         sb->s_fs_info = NULL;
1888 }
1889
1890 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1891                                 unsigned uuid_bytes)
1892 {
1893         int i, ret;
1894         char *ptr;
1895
1896         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1897
1898         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1899         if (osb->uuid_str == NULL)
1900                 return -ENOMEM;
1901
1902         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1903                 /* print with null */
1904                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1905                 if (ret != 2) /* drop super cleans up */
1906                         return -EINVAL;
1907                 /* then only advance past the last char */
1908                 ptr += 2;
1909         }
1910
1911         return 0;
1912 }
1913
1914 static int ocfs2_initialize_super(struct super_block *sb,
1915                                   struct buffer_head *bh,
1916                                   int sector_size,
1917                                   struct ocfs2_blockcheck_stats *stats)
1918 {
1919         int status;
1920         int i, cbits, bbits;
1921         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1922         struct inode *inode = NULL;
1923         struct ocfs2_journal *journal;
1924         __le32 uuid_net_key;
1925         struct ocfs2_super *osb;
1926
1927         mlog_entry_void();
1928
1929         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1930         if (!osb) {
1931                 status = -ENOMEM;
1932                 mlog_errno(status);
1933                 goto bail;
1934         }
1935
1936         sb->s_fs_info = osb;
1937         sb->s_op = &ocfs2_sops;
1938         sb->s_export_op = &ocfs2_export_ops;
1939         sb->s_qcop = &ocfs2_quotactl_ops;
1940         sb->dq_op = &ocfs2_quota_operations;
1941         sb->s_xattr = ocfs2_xattr_handlers;
1942         sb->s_time_gran = 1;
1943         sb->s_flags |= MS_NOATIME;
1944         /* this is needed to support O_LARGEFILE */
1945         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1946         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1947         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1948
1949         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1950
1951         for (i = 0; i < 3; i++)
1952                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1953         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1954
1955         osb->sb = sb;
1956         /* Save off for ocfs2_rw_direct */
1957         osb->s_sectsize_bits = blksize_bits(sector_size);
1958         BUG_ON(!osb->s_sectsize_bits);
1959
1960         spin_lock_init(&osb->dc_task_lock);
1961         init_waitqueue_head(&osb->dc_event);
1962         osb->dc_work_sequence = 0;
1963         osb->dc_wake_sequence = 0;
1964         INIT_LIST_HEAD(&osb->blocked_lock_list);
1965         osb->blocked_lock_count = 0;
1966         spin_lock_init(&osb->osb_lock);
1967         spin_lock_init(&osb->osb_xattr_lock);
1968         ocfs2_init_inode_steal_slot(osb);
1969
1970         atomic_set(&osb->alloc_stats.moves, 0);
1971         atomic_set(&osb->alloc_stats.local_data, 0);
1972         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1973         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1974         atomic_set(&osb->alloc_stats.bg_extends, 0);
1975
1976         /* Copy the blockcheck stats from the superblock probe */
1977         osb->osb_ecc_stats = *stats;
1978
1979         ocfs2_init_node_maps(osb);
1980
1981         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1982                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1983
1984         status = ocfs2_recovery_init(osb);
1985         if (status) {
1986                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1987                 mlog_errno(status);
1988                 goto bail;
1989         }
1990
1991         init_waitqueue_head(&osb->checkpoint_event);
1992         atomic_set(&osb->needs_checkpoint, 0);
1993
1994         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1995
1996         osb->slot_num = OCFS2_INVALID_SLOT;
1997
1998         osb->s_xattr_inline_size = le16_to_cpu(
1999                                         di->id2.i_super.s_xattr_inline_size);
2000
2001         osb->local_alloc_state = OCFS2_LA_UNUSED;
2002         osb->local_alloc_bh = NULL;
2003         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2004
2005         init_waitqueue_head(&osb->osb_mount_event);
2006
2007         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2008         if (!osb->vol_label) {
2009                 mlog(ML_ERROR, "unable to alloc vol label\n");
2010                 status = -ENOMEM;
2011                 goto bail;
2012         }
2013
2014         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2015         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2016                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2017                      osb->max_slots);
2018                 status = -EINVAL;
2019                 goto bail;
2020         }
2021         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2022
2023         osb->slot_recovery_generations =
2024                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2025                         GFP_KERNEL);
2026         if (!osb->slot_recovery_generations) {
2027                 status = -ENOMEM;
2028                 mlog_errno(status);
2029                 goto bail;
2030         }
2031
2032         init_waitqueue_head(&osb->osb_wipe_event);
2033         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2034                                         sizeof(*osb->osb_orphan_wipes),
2035                                         GFP_KERNEL);
2036         if (!osb->osb_orphan_wipes) {
2037                 status = -ENOMEM;
2038                 mlog_errno(status);
2039                 goto bail;
2040         }
2041
2042         osb->s_feature_compat =
2043                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2044         osb->s_feature_ro_compat =
2045                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2046         osb->s_feature_incompat =
2047                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2048
2049         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2050                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2051                      "optional features (%x).\n", i);
2052                 status = -EINVAL;
2053                 goto bail;
2054         }
2055         if (!(osb->sb->s_flags & MS_RDONLY) &&
2056             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2057                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2058                      "unsupported optional features (%x).\n", i);
2059                 status = -EINVAL;
2060                 goto bail;
2061         }
2062
2063         if (ocfs2_userspace_stack(osb)) {
2064                 memcpy(osb->osb_cluster_stack,
2065                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2066                        OCFS2_STACK_LABEL_LEN);
2067                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2068                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2069                         mlog(ML_ERROR,
2070                              "couldn't mount because of an invalid "
2071                              "cluster stack label (%s) \n",
2072                              osb->osb_cluster_stack);
2073                         status = -EINVAL;
2074                         goto bail;
2075                 }
2076         } else {
2077                 /* The empty string is identical with classic tools that
2078                  * don't know about s_cluster_info. */
2079                 osb->osb_cluster_stack[0] = '\0';
2080         }
2081
2082         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2083
2084         /* FIXME
2085          * This should be done in ocfs2_journal_init(), but unknown
2086          * ordering issues will cause the filesystem to crash.
2087          * If anyone wants to figure out what part of the code
2088          * refers to osb->journal before ocfs2_journal_init() is run,
2089          * be my guest.
2090          */
2091         /* initialize our journal structure */
2092
2093         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2094         if (!journal) {
2095                 mlog(ML_ERROR, "unable to alloc journal\n");
2096                 status = -ENOMEM;
2097                 goto bail;
2098         }
2099         osb->journal = journal;
2100         journal->j_osb = osb;
2101
2102         atomic_set(&journal->j_num_trans, 0);
2103         init_rwsem(&journal->j_trans_barrier);
2104         init_waitqueue_head(&journal->j_checkpointed);
2105         spin_lock_init(&journal->j_lock);
2106         journal->j_trans_id = (unsigned long) 1;
2107         INIT_LIST_HEAD(&journal->j_la_cleanups);
2108         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2109         journal->j_state = OCFS2_JOURNAL_FREE;
2110
2111         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2112         osb->dentry_lock_list = NULL;
2113
2114         /* get some pseudo constants for clustersize bits */
2115         osb->s_clustersize_bits =
2116                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2117         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2118         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2119
2120         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2121             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2122                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2123                      osb->s_clustersize);
2124                 status = -EINVAL;
2125                 goto bail;
2126         }
2127
2128         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2129             > (u32)~0UL) {
2130                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2131                      "what jbd can address in 32 bits.\n");
2132                 status = -EINVAL;
2133                 goto bail;
2134         }
2135
2136         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2137                                  sizeof(di->id2.i_super.s_uuid))) {
2138                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2139                 status = -ENOMEM;
2140                 goto bail;
2141         }
2142
2143         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2144
2145         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2146         osb->vol_label[63] = '\0';
2147         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2148         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2149         osb->first_cluster_group_blkno =
2150                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2151         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2152         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2153         mlog(0, "vol_label: %s\n", osb->vol_label);
2154         mlog(0, "uuid: %s\n", osb->uuid_str);
2155         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2156              (unsigned long long)osb->root_blkno,
2157              (unsigned long long)osb->system_dir_blkno);
2158
2159         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2160         if (!osb->osb_dlm_debug) {
2161                 status = -ENOMEM;
2162                 mlog_errno(status);
2163                 goto bail;
2164         }
2165
2166         atomic_set(&osb->vol_state, VOLUME_INIT);
2167
2168         /* load root, system_dir, and all global system inodes */
2169         status = ocfs2_init_global_system_inodes(osb);
2170         if (status < 0) {
2171                 mlog_errno(status);
2172                 goto bail;
2173         }
2174
2175         /*
2176          * global bitmap
2177          */
2178         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2179                                             OCFS2_INVALID_SLOT);
2180         if (!inode) {
2181                 status = -EINVAL;
2182                 mlog_errno(status);
2183                 goto bail;
2184         }
2185
2186         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2187         iput(inode);
2188
2189         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2190
2191         status = ocfs2_init_slot_info(osb);
2192         if (status < 0) {
2193                 mlog_errno(status);
2194                 goto bail;
2195         }
2196
2197 bail:
2198         mlog_exit(status);
2199         return status;
2200 }
2201
2202 /*
2203  * will return: -EAGAIN if it is ok to keep searching for superblocks
2204  *              -EINVAL if there is a bad superblock
2205  *              0 on success
2206  */
2207 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2208                                struct buffer_head *bh,
2209                                u32 blksz,
2210                                struct ocfs2_blockcheck_stats *stats)
2211 {
2212         int status = -EAGAIN;
2213
2214         mlog_entry_void();
2215
2216         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2217                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2218                 /* We have to do a raw check of the feature here */
2219                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2220                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2221                         status = ocfs2_block_check_validate(bh->b_data,
2222                                                             bh->b_size,
2223                                                             &di->i_check,
2224                                                             stats);
2225                         if (status)
2226                                 goto out;
2227                 }
2228                 status = -EINVAL;
2229                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2230                         mlog(ML_ERROR, "found superblock with incorrect block "
2231                              "size: found %u, should be %u\n",
2232                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2233                                blksz);
2234                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2235                            OCFS2_MAJOR_REV_LEVEL ||
2236                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2237                            OCFS2_MINOR_REV_LEVEL) {
2238                         mlog(ML_ERROR, "found superblock with bad version: "
2239                              "found %u.%u, should be %u.%u\n",
2240                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2241                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2242                              OCFS2_MAJOR_REV_LEVEL,
2243                              OCFS2_MINOR_REV_LEVEL);
2244                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2245                         mlog(ML_ERROR, "bad block number on superblock: "
2246                              "found %llu, should be %llu\n",
2247                              (unsigned long long)le64_to_cpu(di->i_blkno),
2248                              (unsigned long long)bh->b_blocknr);
2249                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2250                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2251                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2252                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2253                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2254                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2255                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2256                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2257                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2258                         mlog(ML_ERROR,
2259                              "Superblock slots found greater than file system "
2260                              "maximum: found %u, max %u\n",
2261                              le16_to_cpu(di->id2.i_super.s_max_slots),
2262                              OCFS2_MAX_SLOTS);
2263                 } else {
2264                         /* found it! */
2265                         status = 0;
2266                 }
2267         }
2268
2269 out:
2270         mlog_exit(status);
2271         return status;
2272 }
2273
2274 static int ocfs2_check_volume(struct ocfs2_super *osb)
2275 {
2276         int status;
2277         int dirty;
2278         int local;
2279         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2280                                                   * recover
2281                                                   * ourselves. */
2282
2283         mlog_entry_void();
2284
2285         /* Init our journal object. */
2286         status = ocfs2_journal_init(osb->journal, &dirty);
2287         if (status < 0) {
2288                 mlog(ML_ERROR, "Could not initialize journal!\n");
2289                 goto finally;
2290         }
2291
2292         /* If the journal was unmounted cleanly then we don't want to
2293          * recover anything. Otherwise, journal_load will do that
2294          * dirty work for us :) */
2295         if (!dirty) {
2296                 status = ocfs2_journal_wipe(osb->journal, 0);
2297                 if (status < 0) {
2298                         mlog_errno(status);
2299                         goto finally;
2300                 }
2301         } else {
2302                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2303                      "recovering volume.\n");
2304         }
2305
2306         local = ocfs2_mount_local(osb);
2307
2308         /* will play back anything left in the journal. */
2309         status = ocfs2_journal_load(osb->journal, local, dirty);
2310         if (status < 0) {
2311                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2312                 goto finally;
2313         }
2314
2315         if (dirty) {
2316                 /* recover my local alloc if we didn't unmount cleanly. */
2317                 status = ocfs2_begin_local_alloc_recovery(osb,
2318                                                           osb->slot_num,
2319                                                           &local_alloc);
2320                 if (status < 0) {
2321                         mlog_errno(status);
2322                         goto finally;
2323                 }
2324                 /* we complete the recovery process after we've marked
2325                  * ourselves as mounted. */
2326         }
2327
2328         mlog(0, "Journal loaded.\n");
2329
2330         status = ocfs2_load_local_alloc(osb);
2331         if (status < 0) {
2332                 mlog_errno(status);
2333                 goto finally;
2334         }
2335
2336         if (dirty) {
2337                 /* Recovery will be completed after we've mounted the
2338                  * rest of the volume. */
2339                 osb->dirty = 1;
2340                 osb->local_alloc_copy = local_alloc;
2341                 local_alloc = NULL;
2342         }
2343
2344         /* go through each journal, trylock it and if you get the
2345          * lock, and it's marked as dirty, set the bit in the recover
2346          * map and launch a recovery thread for it. */
2347         status = ocfs2_mark_dead_nodes(osb);
2348         if (status < 0) {
2349                 mlog_errno(status);
2350                 goto finally;
2351         }
2352
2353         status = ocfs2_compute_replay_slots(osb);
2354         if (status < 0)
2355                 mlog_errno(status);
2356
2357 finally:
2358         if (local_alloc)
2359                 kfree(local_alloc);
2360
2361         mlog_exit(status);
2362         return status;
2363 }
2364
2365 /*
2366  * The routine gets called from dismount or close whenever a dismount on
2367  * volume is requested and the osb open count becomes 1.
2368  * It will remove the osb from the global list and also free up all the
2369  * initialized resources and fileobject.
2370  */
2371 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2372 {
2373         mlog_entry_void();
2374
2375         /* This function assumes that the caller has the main osb resource */
2376
2377         ocfs2_free_slot_info(osb);
2378
2379         kfree(osb->osb_orphan_wipes);
2380         kfree(osb->slot_recovery_generations);
2381         /* FIXME
2382          * This belongs in journal shutdown, but because we have to
2383          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2384          * we free it here.
2385          */
2386         kfree(osb->journal);
2387         if (osb->local_alloc_copy)
2388                 kfree(osb->local_alloc_copy);
2389         kfree(osb->uuid_str);
2390         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2391         memset(osb, 0, sizeof(struct ocfs2_super));
2392
2393         mlog_exit_void();
2394 }
2395
2396 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2397  * panic(). We do not support continue-on-error operation. */
2398 static void ocfs2_handle_error(struct super_block *sb)
2399 {
2400         struct ocfs2_super *osb = OCFS2_SB(sb);
2401
2402         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2403                 panic("OCFS2: (device %s): panic forced after error\n",
2404                       sb->s_id);
2405
2406         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2407
2408         if (sb->s_flags & MS_RDONLY &&
2409             (ocfs2_is_soft_readonly(osb) ||
2410              ocfs2_is_hard_readonly(osb)))
2411                 return;
2412
2413         printk(KERN_CRIT "File system is now read-only due to the potential "
2414                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2415                "system is unmounted.\n");
2416         sb->s_flags |= MS_RDONLY;
2417         ocfs2_set_ro_flag(osb, 0);
2418 }
2419
2420 static char error_buf[1024];
2421
2422 void __ocfs2_error(struct super_block *sb,
2423                    const char *function,
2424                    const char *fmt, ...)
2425 {
2426         va_list args;
2427
2428         va_start(args, fmt);
2429         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2430         va_end(args);
2431
2432         /* Not using mlog here because we want to show the actual
2433          * function the error came from. */
2434         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2435                sb->s_id, function, error_buf);
2436
2437         ocfs2_handle_error(sb);
2438 }
2439
2440 /* Handle critical errors. This is intentionally more drastic than
2441  * ocfs2_handle_error, so we only use for things like journal errors,
2442  * etc. */
2443 void __ocfs2_abort(struct super_block* sb,
2444                    const char *function,
2445                    const char *fmt, ...)
2446 {
2447         va_list args;
2448
2449         va_start(args, fmt);
2450         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2451         va_end(args);
2452
2453         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2454                sb->s_id, function, error_buf);
2455
2456         /* We don't have the cluster support yet to go straight to
2457          * hard readonly in here. Until then, we want to keep
2458          * ocfs2_abort() so that we can at least mark critical
2459          * errors.
2460          *
2461          * TODO: This should abort the journal and alert other nodes
2462          * that our slot needs recovery. */
2463
2464         /* Force a panic(). This stinks, but it's better than letting
2465          * things continue without having a proper hard readonly
2466          * here. */
2467         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2468         ocfs2_handle_error(sb);
2469 }
2470
2471 module_init(ocfs2_init);
2472 module_exit(ocfs2_exit);