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 #include "refcounttree.h"
  73
  74 #include "buffer_head_io.h"
  75
  76 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  77 struct kmem_cache *ocfs2_dquot_cachep;
  78 struct kmem_cache *ocfs2_qf_chunk_cachep;
  79
  80 /* OCFS2 needs to schedule several differnt types of work which
  81  * require cluster locking, disk I/O, recovery waits, etc. Since these
  82  * types of work tend to be heavy we avoid using the kernel events
  83  * workqueue and schedule on our own. */
  84 struct workqueue_struct *ocfs2_wq = NULL;
  85
  86 static struct dentry *ocfs2_debugfs_root = NULL;
  87
  88 MODULE_AUTHOR("Oracle");
  89 MODULE_LICENSE("GPL");
  90
  91 struct mount_options
  92 {
  93         unsigned long   commit_interval;
  94         unsigned long   mount_opt;
  95         unsigned int    atime_quantum;
  96         signed short    slot;
  97         unsigned int    localalloc_opt;
  98         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  99 };
 100
 101 static int ocfs2_parse_options(struct super_block *sb, char *options,
 102                                struct mount_options *mopt,
 103                                int is_remount);
 104 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 105 static void ocfs2_put_super(struct super_block *sb);
 106 static int ocfs2_mount_volume(struct super_block *sb);
 107 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 108 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 109 static int ocfs2_initialize_mem_caches(void);
 110 static void ocfs2_free_mem_caches(void);
 111 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 112
 113 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 114
 115 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 116
 117 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 118 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 119 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 120 static int ocfs2_check_volume(struct ocfs2_super *osb);
 121 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 122                                struct buffer_head *bh,
 123                                u32 sectsize,
 124                                struct ocfs2_blockcheck_stats *stats);
 125 static int ocfs2_initialize_super(struct super_block *sb,
 126                                   struct buffer_head *bh,
 127                                   int sector_size,
 128                                   struct ocfs2_blockcheck_stats *stats);
 129 static int ocfs2_get_sector(struct super_block *sb,
 130                             struct buffer_head **bh,
 131                             int block,
 132                             int sect_size);
 133 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 134 static void ocfs2_destroy_inode(struct inode *inode);
 135 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 136 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 137 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 138
 139 static const struct super_operations ocfs2_sops = {
 140         .statfs         = ocfs2_statfs,
 141         .alloc_inode    = ocfs2_alloc_inode,
 142         .destroy_inode  = ocfs2_destroy_inode,
 143         .drop_inode     = ocfs2_drop_inode,
 144         .clear_inode    = ocfs2_clear_inode,
 145         .delete_inode   = ocfs2_delete_inode,
 146         .sync_fs        = ocfs2_sync_fs,
 147         .put_super      = ocfs2_put_super,
 148         .remount_fs     = ocfs2_remount,
 149         .show_options   = ocfs2_show_options,
 150         .quota_read     = ocfs2_quota_read,
 151         .quota_write    = ocfs2_quota_write,
 152 };
 153
 154 enum {
 155         Opt_barrier,
 156         Opt_err_panic,
 157         Opt_err_ro,
 158         Opt_intr,
 159         Opt_nointr,
 160         Opt_hb_none,
 161         Opt_hb_local,
 162         Opt_data_ordered,
 163         Opt_data_writeback,
 164         Opt_atime_quantum,
 165         Opt_slot,
 166         Opt_commit,
 167         Opt_localalloc,
 168         Opt_localflocks,
 169         Opt_stack,
 170         Opt_user_xattr,
 171         Opt_nouser_xattr,
 172         Opt_inode64,
 173         Opt_acl,
 174         Opt_noacl,
 175         Opt_usrquota,
 176         Opt_grpquota,
 177         Opt_err,
 178 };
 179
 180 static const match_table_t tokens = {
 181         {Opt_barrier, "barrier=%u"},
 182         {Opt_err_panic, "errors=panic"},
 183         {Opt_err_ro, "errors=remount-ro"},
 184         {Opt_intr, "intr"},
 185         {Opt_nointr, "nointr"},
 186         {Opt_hb_none, OCFS2_HB_NONE},
 187         {Opt_hb_local, OCFS2_HB_LOCAL},
 188         {Opt_data_ordered, "data=ordered"},
 189         {Opt_data_writeback, "data=writeback"},
 190         {Opt_atime_quantum, "atime_quantum=%u"},
 191         {Opt_slot, "preferred_slot=%u"},
 192         {Opt_commit, "commit=%u"},
 193         {Opt_localalloc, "localalloc=%d"},
 194         {Opt_localflocks, "localflocks"},
 195         {Opt_stack, "cluster_stack=%s"},
 196         {Opt_user_xattr, "user_xattr"},
 197         {Opt_nouser_xattr, "nouser_xattr"},
 198         {Opt_inode64, "inode64"},
 199         {Opt_acl, "acl"},
 200         {Opt_noacl, "noacl"},
 201         {Opt_usrquota, "usrquota"},
 202         {Opt_grpquota, "grpquota"},
 203         {Opt_err, NULL}
 204 };
 205
 206 #ifdef CONFIG_DEBUG_FS
 207 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 208 {
 209         struct ocfs2_cluster_connection *cconn = osb->cconn;
 210         struct ocfs2_recovery_map *rm = osb->recovery_map;
 211         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 212         int i, out = 0;
 213
 214         out += snprintf(buf + out, len - out,
 215                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 216                         "Device", osb->dev_str, osb->uuid_str,
 217                         osb->fs_generation, osb->vol_label);
 218
 219         out += snprintf(buf + out, len - out,
 220                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 221                         atomic_read(&osb->vol_state), osb->osb_flags);
 222
 223         out += snprintf(buf + out, len - out,
 224                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 225                         osb->sb->s_blocksize, osb->s_clustersize);
 226
 227         out += snprintf(buf + out, len - out,
 228                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 229                         "ROcompat: 0x%X\n",
 230                         "Features", osb->s_feature_compat,
 231                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 232
 233         out += snprintf(buf + out, len - out,
 234                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 235                         osb->s_mount_opt, osb->s_atime_quantum);
 236
 237         if (cconn) {
 238                 out += snprintf(buf + out, len - out,
 239                                 "%10s => Stack: %s  Name: %*s  "
 240                                 "Version: %d.%d\n", "Cluster",
 241                                 (*osb->osb_cluster_stack == '\0' ?
 242                                  "o2cb" : osb->osb_cluster_stack),
 243                                 cconn->cc_namelen, cconn->cc_name,
 244                                 cconn->cc_version.pv_major,
 245                                 cconn->cc_version.pv_minor);
 246         }
 247
 248         spin_lock(&osb->dc_task_lock);
 249         out += snprintf(buf + out, len - out,
 250                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 251                         "WorkSeq: %lu\n", "DownCnvt",
 252                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 253                         osb->blocked_lock_count, osb->dc_wake_sequence,
 254                         osb->dc_work_sequence);
 255         spin_unlock(&osb->dc_task_lock);
 256
 257         spin_lock(&osb->osb_lock);
 258         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 259                         "Recovery",
 260                         (osb->recovery_thread_task ?
 261                          task_pid_nr(osb->recovery_thread_task) : -1));
 262         if (rm->rm_used == 0)
 263                 out += snprintf(buf + out, len - out, " None\n");
 264         else {
 265                 for (i = 0; i < rm->rm_used; i++)
 266                         out += snprintf(buf + out, len - out, " %d",
 267                                         rm->rm_entries[i]);
 268                 out += snprintf(buf + out, len - out, "\n");
 269         }
 270         spin_unlock(&osb->osb_lock);
 271
 272         out += snprintf(buf + out, len - out,
 273                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 274                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 275                         osb->osb_commit_interval,
 276                         atomic_read(&osb->needs_checkpoint));
 277
 278         out += snprintf(buf + out, len - out,
 279                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 280                         "Journal", osb->journal->j_state,
 281                         osb->journal->j_trans_id,
 282                         atomic_read(&osb->journal->j_num_trans));
 283
 284         out += snprintf(buf + out, len - out,
 285                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 286                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 287                         "Stats",
 288                         atomic_read(&osb->alloc_stats.bitmap_data),
 289                         atomic_read(&osb->alloc_stats.local_data),
 290                         atomic_read(&osb->alloc_stats.bg_allocs),
 291                         atomic_read(&osb->alloc_stats.moves),
 292                         atomic_read(&osb->alloc_stats.bg_extends));
 293
 294         out += snprintf(buf + out, len - out,
 295                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 296                         "Default: %u bits\n",
 297                         "LocalAlloc", osb->local_alloc_state,
 298                         (unsigned long long)osb->la_last_gd,
 299                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 300
 301         spin_lock(&osb->osb_lock);
 302         out += snprintf(buf + out, len - out,
 303                         "%10s => Slot: %d  NumStolen: %d\n", "Steal",
 304                         osb->s_inode_steal_slot,
 305                         atomic_read(&osb->s_num_inodes_stolen));
 306         spin_unlock(&osb->osb_lock);
 307
 308         out += snprintf(buf + out, len - out, "OrphanScan => ");
 309         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 310                         os->os_count, os->os_seqno);
 311         out += snprintf(buf + out, len - out, " Last Scan: ");
 312         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 313                 out += snprintf(buf + out, len - out, "Disabled\n");
 314         else
 315                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 316                                 (get_seconds() - os->os_scantime.tv_sec));
 317
 318         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 319                         "Slots", "Num", "RecoGen");
 320         for (i = 0; i < osb->max_slots; ++i) {
 321                 out += snprintf(buf + out, len - out,
 322                                 "%10s  %c %3d  %10d\n",
 323                                 " ",
 324                                 (i == osb->slot_num ? '*' : ' '),
 325                                 i, osb->slot_recovery_generations[i]);
 326         }
 327
 328         return out;
 329 }
 330
 331 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 332 {
 333         struct ocfs2_super *osb = inode->i_private;
 334         char *buf = NULL;
 335
 336         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 337         if (!buf)
 338                 goto bail;
 339
 340         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 341
 342         file->private_data = buf;
 343
 344         return 0;
 345 bail:
 346         return -ENOMEM;
 347 }
 348
 349 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 350 {
 351         kfree(file->private_data);
 352         return 0;
 353 }
 354
 355 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 356                                 size_t nbytes, loff_t *ppos)
 357 {
 358         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 359                                        i_size_read(file->f_mapping->host));
 360 }
 361 #else
 362 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 363 {
 364         return 0;
 365 }
 366 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 367 {
 368         return 0;
 369 }
 370 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 371                                 size_t nbytes, loff_t *ppos)
 372 {
 373         return 0;
 374 }
 375 #endif  /* CONFIG_DEBUG_FS */
 376
 377 static struct file_operations ocfs2_osb_debug_fops = {
 378         .open =         ocfs2_osb_debug_open,
 379         .release =      ocfs2_debug_release,
 380         .read =         ocfs2_debug_read,
 381         .llseek =       generic_file_llseek,
 382 };
 383
 384 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 385 {
 386         int status;
 387         tid_t target;
 388         struct ocfs2_super *osb = OCFS2_SB(sb);
 389
 390         if (ocfs2_is_hard_readonly(osb))
 391                 return -EROFS;
 392
 393         if (wait) {
 394                 status = ocfs2_flush_truncate_log(osb);
 395                 if (status < 0)
 396                         mlog_errno(status);
 397         } else {
 398                 ocfs2_schedule_truncate_log_flush(osb, 0);
 399         }
 400
 401         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 402                                       &target)) {
 403                 if (wait)
 404                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 405                                              target);
 406         }
 407         return 0;
 408 }
 409
 410 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 411 {
 412         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 413             && (ino == USER_QUOTA_SYSTEM_INODE
 414                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 415                 return 0;
 416         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 417             && (ino == GROUP_QUOTA_SYSTEM_INODE
 418                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 419                 return 0;
 420         return 1;
 421 }
 422
 423 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 424 {
 425         struct inode *new = NULL;
 426         int status = 0;
 427         int i;
 428
 429         mlog_entry_void();
 430
 431         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 432         if (IS_ERR(new)) {
 433                 status = PTR_ERR(new);
 434                 mlog_errno(status);
 435                 goto bail;
 436         }
 437         osb->root_inode = new;
 438
 439         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 440         if (IS_ERR(new)) {
 441                 status = PTR_ERR(new);
 442                 mlog_errno(status);
 443                 goto bail;
 444         }
 445         osb->sys_root_inode = new;
 446
 447         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 448              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 449                 if (!ocfs2_need_system_inode(osb, i))
 450                         continue;
 451                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 452                 if (!new) {
 453                         ocfs2_release_system_inodes(osb);
 454                         status = -EINVAL;
 455                         mlog_errno(status);
 456                         /* FIXME: Should ERROR_RO_FS */
 457                         mlog(ML_ERROR, "Unable to load system inode %d, "
 458                              "possibly corrupt fs?", i);
 459                         goto bail;
 460                 }
 461                 // the array now has one ref, so drop this one
 462                 iput(new);
 463         }
 464
 465 bail:
 466         mlog_exit(status);
 467         return status;
 468 }
 469
 470 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 471 {
 472         struct inode *new = NULL;
 473         int status = 0;
 474         int i;
 475
 476         mlog_entry_void();
 477
 478         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 479              i < NUM_SYSTEM_INODES;
 480              i++) {
 481                 if (!ocfs2_need_system_inode(osb, i))
 482                         continue;
 483                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 484                 if (!new) {
 485                         ocfs2_release_system_inodes(osb);
 486                         status = -EINVAL;
 487                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 488                              status, i, osb->slot_num);
 489                         goto bail;
 490                 }
 491                 /* the array now has one ref, so drop this one */
 492                 iput(new);
 493         }
 494
 495 bail:
 496         mlog_exit(status);
 497         return status;
 498 }
 499
 500 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 501 {
 502         int i;
 503         struct inode *inode;
 504
 505         mlog_entry_void();
 506
 507         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 508                 inode = osb->system_inodes[i];
 509                 if (inode) {
 510                         iput(inode);
 511                         osb->system_inodes[i] = NULL;
 512                 }
 513         }
 514
 515         inode = osb->sys_root_inode;
 516         if (inode) {
 517                 iput(inode);
 518                 osb->sys_root_inode = NULL;
 519         }
 520
 521         inode = osb->root_inode;
 522         if (inode) {
 523                 iput(inode);
 524                 osb->root_inode = NULL;
 525         }
 526
 527         mlog_exit(0);
 528 }
 529
 530 /* We're allocating fs objects, use GFP_NOFS */
 531 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 532 {
 533         struct ocfs2_inode_info *oi;
 534
 535         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 536         if (!oi)
 537                 return NULL;
 538
 539         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 540         return &oi->vfs_inode;
 541 }
 542
 543 static void ocfs2_destroy_inode(struct inode *inode)
 544 {
 545         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 546 }
 547
 548 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 549                                                 unsigned int cbits)
 550 {
 551         unsigned int bytes = 1 << cbits;
 552         unsigned int trim = bytes;
 553         unsigned int bitshift = 32;
 554
 555         /*
 556          * i_size and all block offsets in ocfs2 are always 64 bits
 557          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 558          * 64 bit platforms, cluster size will be the limiting factor.
 559          */
 560
 561 #if BITS_PER_LONG == 32
 562 # if defined(CONFIG_LBDAF)
 563         BUILD_BUG_ON(sizeof(sector_t) != 8);
 564         /*
 565          * We might be limited by page cache size.
 566          */
 567         if (bytes > PAGE_CACHE_SIZE) {
 568                 bytes = PAGE_CACHE_SIZE;
 569                 trim = 1;
 570                 /*
 571                  * Shift by 31 here so that we don't get larger than
 572                  * MAX_LFS_FILESIZE
 573                  */
 574                 bitshift = 31;
 575         }
 576 # else
 577         /*
 578          * We are limited by the size of sector_t. Use block size, as
 579          * that's what we expose to the VFS.
 580          */
 581         bytes = 1 << bbits;
 582         trim = 1;
 583         bitshift = 31;
 584 # endif
 585 #endif
 586
 587         /*
 588          * Trim by a whole cluster when we can actually approach the
 589          * on-disk limits. Otherwise we can overflow i_clusters when
 590          * an extent start is at the max offset.
 591          */
 592         return (((unsigned long long)bytes) << bitshift) - trim;
 593 }
 594
 595 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 596 {
 597         int incompat_features;
 598         int ret = 0;
 599         struct mount_options parsed_options;
 600         struct ocfs2_super *osb = OCFS2_SB(sb);
 601
 602         lock_kernel();
 603
 604         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 605                 ret = -EINVAL;
 606                 goto out;
 607         }
 608
 609         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 610             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 611                 ret = -EINVAL;
 612                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 613                 goto out;
 614         }
 615
 616         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 617             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 618                 ret = -EINVAL;
 619                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 620                 goto out;
 621         }
 622
 623         /* Probably don't want this on remount; it might
 624          * mess with other nodes */
 625         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 626             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 627                 ret = -EINVAL;
 628                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 629                 goto out;
 630         }
 631
 632         /* We're going to/from readonly mode. */
 633         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 634                 /* Disable quota accounting before remounting RO */
 635                 if (*flags & MS_RDONLY) {
 636                         ret = ocfs2_susp_quotas(osb, 0);
 637                         if (ret < 0)
 638                                 goto out;
 639                 }
 640                 /* Lock here so the check of HARD_RO and the potential
 641                  * setting of SOFT_RO is atomic. */
 642                 spin_lock(&osb->osb_lock);
 643                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 644                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 645                         ret = -EROFS;
 646                         goto unlock_osb;
 647                 }
 648
 649                 if (*flags & MS_RDONLY) {
 650                         mlog(0, "Going to ro mode.\n");
 651                         sb->s_flags |= MS_RDONLY;
 652                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 653                 } else {
 654                         mlog(0, "Making ro filesystem writeable.\n");
 655
 656                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 657                                 mlog(ML_ERROR, "Cannot remount RDWR "
 658                                      "filesystem due to previous errors.\n");
 659                                 ret = -EROFS;
 660                                 goto unlock_osb;
 661                         }
 662                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 663                         if (incompat_features) {
 664                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 665                                      "of unsupported optional features "
 666                                      "(%x).\n", incompat_features);
 667                                 ret = -EINVAL;
 668                                 goto unlock_osb;
 669                         }
 670                         sb->s_flags &= ~MS_RDONLY;
 671                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 672                 }
 673 unlock_osb:
 674                 spin_unlock(&osb->osb_lock);
 675                 /* Enable quota accounting after remounting RW */
 676                 if (!ret && !(*flags & MS_RDONLY)) {
 677                         if (sb_any_quota_suspended(sb))
 678                                 ret = ocfs2_susp_quotas(osb, 1);
 679                         else
 680                                 ret = ocfs2_enable_quotas(osb);
 681                         if (ret < 0) {
 682                                 /* Return back changes... */
 683                                 spin_lock(&osb->osb_lock);
 684                                 sb->s_flags |= MS_RDONLY;
 685                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 686                                 spin_unlock(&osb->osb_lock);
 687                                 goto out;
 688                         }
 689                 }
 690         }
 691
 692         if (!ret) {
 693                 /* Only save off the new mount options in case of a successful
 694                  * remount. */
 695                 if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 696                         parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 697                 osb->s_mount_opt = parsed_options.mount_opt;
 698                 osb->s_atime_quantum = parsed_options.atime_quantum;
 699                 osb->preferred_slot = parsed_options.slot;
 700                 if (parsed_options.commit_interval)
 701                         osb->osb_commit_interval = parsed_options.commit_interval;
 702
 703                 if (!ocfs2_is_hard_readonly(osb))
 704                         ocfs2_set_journal_params(osb);
 705         }
 706 out:
 707         unlock_kernel();
 708         return ret;
 709 }
 710
 711 static int ocfs2_sb_probe(struct super_block *sb,
 712                           struct buffer_head **bh,
 713                           int *sector_size,
 714                           struct ocfs2_blockcheck_stats *stats)
 715 {
 716         int status, tmpstat;
 717         struct ocfs1_vol_disk_hdr *hdr;
 718         struct ocfs2_dinode *di;
 719         int blksize;
 720
 721         *bh = NULL;
 722
 723         /* may be > 512 */
 724         *sector_size = bdev_logical_block_size(sb->s_bdev);
 725         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 726                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 727                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 728                 status = -EINVAL;
 729                 goto bail;
 730         }
 731
 732         /* Can this really happen? */
 733         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 734                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 735
 736         /* check block zero for old format */
 737         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 738         if (status < 0) {
 739                 mlog_errno(status);
 740                 goto bail;
 741         }
 742         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 743         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 744                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 745                      hdr->major_version, hdr->minor_version);
 746                 status = -EINVAL;
 747         }
 748         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 749                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 750                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 751                      hdr->signature);
 752                 status = -EINVAL;
 753         }
 754         brelse(*bh);
 755         *bh = NULL;
 756         if (status < 0) {
 757                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 758                      "upgraded before mounting with ocfs v2\n");
 759                 goto bail;
 760         }
 761
 762         /*
 763          * Now check at magic offset for 512, 1024, 2048, 4096
 764          * blocksizes.  4096 is the maximum blocksize because it is
 765          * the minimum clustersize.
 766          */
 767         status = -EINVAL;
 768         for (blksize = *sector_size;
 769              blksize <= OCFS2_MAX_BLOCKSIZE;
 770              blksize <<= 1) {
 771                 tmpstat = ocfs2_get_sector(sb, bh,
 772                                            OCFS2_SUPER_BLOCK_BLKNO,
 773                                            blksize);
 774                 if (tmpstat < 0) {
 775                         status = tmpstat;
 776                         mlog_errno(status);
 777                         goto bail;
 778                 }
 779                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 780                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 781                 spin_lock_init(&stats->b_lock);
 782                 status = ocfs2_verify_volume(di, *bh, blksize, stats);
 783                 if (status >= 0)
 784                         goto bail;
 785                 brelse(*bh);
 786                 *bh = NULL;
 787                 if (status != -EAGAIN)
 788                         break;
 789         }
 790
 791 bail:
 792         return status;
 793 }
 794
 795 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 796 {
 797         if (ocfs2_mount_local(osb)) {
 798                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 799                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 800                              "mounted device.\n");
 801                         return -EINVAL;
 802                 }
 803         }
 804
 805         if (ocfs2_userspace_stack(osb)) {
 806                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 807                         mlog(ML_ERROR, "Userspace stack expected, but "
 808                              "o2cb heartbeat arguments passed to mount\n");
 809                         return -EINVAL;
 810                 }
 811         }
 812
 813         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 814                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 815                     !ocfs2_userspace_stack(osb)) {
 816                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 817                              "a read-write clustered device.\n");
 818                         return -EINVAL;
 819                 }
 820         }
 821
 822         return 0;
 823 }
 824
 825 /*
 826  * If we're using a userspace stack, mount should have passed
 827  * a name that matches the disk.  If not, mount should not
 828  * have passed a stack.
 829  */
 830 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 831                                         struct mount_options *mopt)
 832 {
 833         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 834                 mlog(ML_ERROR,
 835                      "cluster stack passed to mount, but this filesystem "
 836                      "does not support it\n");
 837                 return -EINVAL;
 838         }
 839
 840         if (ocfs2_userspace_stack(osb) &&
 841             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 842                     OCFS2_STACK_LABEL_LEN)) {
 843                 mlog(ML_ERROR,
 844                      "cluster stack passed to mount (\"%s\") does not "
 845                      "match the filesystem (\"%s\")\n",
 846                      mopt->cluster_stack,
 847                      osb->osb_cluster_stack);
 848                 return -EINVAL;
 849         }
 850
 851         return 0;
 852 }
 853
 854 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 855 {
 856         int type;
 857         struct super_block *sb = osb->sb;
 858         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 859                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 860         int status = 0;
 861
 862         for (type = 0; type < MAXQUOTAS; type++) {
 863                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 864                         continue;
 865                 if (unsuspend)
 866                         status = vfs_quota_enable(
 867                                         sb_dqopt(sb)->files[type],
 868                                         type, QFMT_OCFS2,
 869                                         DQUOT_SUSPENDED);
 870                 else
 871                         status = vfs_quota_disable(sb, type,
 872                                                    DQUOT_SUSPENDED);
 873                 if (status < 0)
 874                         break;
 875         }
 876         if (status < 0)
 877                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 878                      "remount (error = %d).\n", status);
 879         return status;
 880 }
 881
 882 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 883 {
 884         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 885         struct super_block *sb = osb->sb;
 886         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 887                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 888         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 889                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 890         int status;
 891         int type;
 892
 893         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 894         for (type = 0; type < MAXQUOTAS; type++) {
 895                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 896                         continue;
 897                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 898                                                         osb->slot_num);
 899                 if (!inode[type]) {
 900                         status = -ENOENT;
 901                         goto out_quota_off;
 902                 }
 903                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 904                                                 DQUOT_USAGE_ENABLED);
 905                 if (status < 0)
 906                         goto out_quota_off;
 907         }
 908
 909         for (type = 0; type < MAXQUOTAS; type++)
 910                 iput(inode[type]);
 911         return 0;
 912 out_quota_off:
 913         ocfs2_disable_quotas(osb);
 914         for (type = 0; type < MAXQUOTAS; type++)
 915                 iput(inode[type]);
 916         mlog_errno(status);
 917         return status;
 918 }
 919
 920 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 921 {
 922         int type;
 923         struct inode *inode;
 924         struct super_block *sb = osb->sb;
 925
 926         /* We mostly ignore errors in this function because there's not much
 927          * we can do when we see them */
 928         for (type = 0; type < MAXQUOTAS; type++) {
 929                 if (!sb_has_quota_loaded(sb, type))
 930                         continue;
 931                 inode = igrab(sb->s_dquot.files[type]);
 932                 /* Turn off quotas. This will remove all dquot structures from
 933                  * memory and so they will be automatically synced to global
 934                  * quota files */
 935                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 936                                             DQUOT_LIMITS_ENABLED);
 937                 if (!inode)
 938                         continue;
 939                 iput(inode);
 940         }
 941 }
 942
 943 /* Handle quota on quotactl */
 944 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 945                           char *path, int remount)
 946 {
 947         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 948                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 949
 950         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 951                 return -EINVAL;
 952
 953         if (remount)
 954                 return 0;       /* Just ignore it has been handled in
 955                                  * ocfs2_remount() */
 956         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 957                                     format_id, DQUOT_LIMITS_ENABLED);
 958 }
 959
 960 /* Handle quota off quotactl */
 961 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 962 {
 963         if (remount)
 964                 return 0;       /* Ignore now and handle later in
 965                                  * ocfs2_remount() */
 966         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 967 }
 968
 969 static struct quotactl_ops ocfs2_quotactl_ops = {
 970         .quota_on       = ocfs2_quota_on,
 971         .quota_off      = ocfs2_quota_off,
 972         .quota_sync     = vfs_quota_sync,
 973         .get_info       = vfs_get_dqinfo,
 974         .set_info       = vfs_set_dqinfo,
 975         .get_dqblk      = vfs_get_dqblk,
 976         .set_dqblk      = vfs_set_dqblk,
 977 };
 978
 979 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 980 {
 981         struct dentry *root;
 982         int status, sector_size;
 983         struct mount_options parsed_options;
 984         struct inode *inode = NULL;
 985         struct ocfs2_super *osb = NULL;
 986         struct buffer_head *bh = NULL;
 987         char nodestr[8];
 988         struct ocfs2_blockcheck_stats stats;
 989
 990         mlog_entry("%p, %p, %i", sb, data, silent);
 991
 992         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 993                 status = -EINVAL;
 994                 goto read_super_error;
 995         }
 996
 997         /* probe for superblock */
 998         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
 999         if (status < 0) {
1000                 mlog(ML_ERROR, "superblock probe failed!\n");
1001                 goto read_super_error;
1002         }
1003
1004         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1005         osb = OCFS2_SB(sb);
1006         if (status < 0) {
1007                 mlog_errno(status);
1008                 goto read_super_error;
1009         }
1010         brelse(bh);
1011         bh = NULL;
1012
1013         if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
1014                 parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1015
1016         osb->s_mount_opt = parsed_options.mount_opt;
1017         osb->s_atime_quantum = parsed_options.atime_quantum;
1018         osb->preferred_slot = parsed_options.slot;
1019         osb->osb_commit_interval = parsed_options.commit_interval;
1020         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1021         osb->local_alloc_bits = osb->local_alloc_default_bits;
1022         if (osb->s_mount_opt & OCFS2_MOUNT_USRQUOTA &&
1023             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1024                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1025                 status = -EINVAL;
1026                 mlog(ML_ERROR, "User quotas were requested, but this "
1027                      "filesystem does not have the feature enabled.\n");
1028                 goto read_super_error;
1029         }
1030         if (osb->s_mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1031             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1032                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1033                 status = -EINVAL;
1034                 mlog(ML_ERROR, "Group quotas were requested, but this "
1035                      "filesystem does not have the feature enabled.\n");
1036                 goto read_super_error;
1037         }
1038
1039         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1040         if (status)
1041                 goto read_super_error;
1042
1043         sb->s_magic = OCFS2_SUPER_MAGIC;
1044
1045         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1046                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1047
1048         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1049          * heartbeat=none */
1050         if (bdev_read_only(sb->s_bdev)) {
1051                 if (!(sb->s_flags & MS_RDONLY)) {
1052                         status = -EACCES;
1053                         mlog(ML_ERROR, "Readonly device detected but readonly "
1054                              "mount was not specified.\n");
1055                         goto read_super_error;
1056                 }
1057
1058                 /* You should not be able to start a local heartbeat
1059                  * on a readonly device. */
1060                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1061                         status = -EROFS;
1062                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1063                              "device.\n");
1064                         goto read_super_error;
1065                 }
1066
1067                 status = ocfs2_check_journals_nolocks(osb);
1068                 if (status < 0) {
1069                         if (status == -EROFS)
1070                                 mlog(ML_ERROR, "Recovery required on readonly "
1071                                      "file system, but write access is "
1072                                      "unavailable.\n");
1073                         else
1074                                 mlog_errno(status);
1075                         goto read_super_error;
1076                 }
1077
1078                 ocfs2_set_ro_flag(osb, 1);
1079
1080                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1081                        "services will be utilized for this mount. Recovery "
1082                        "will be skipped.\n");
1083         }
1084
1085         if (!ocfs2_is_hard_readonly(osb)) {
1086                 if (sb->s_flags & MS_RDONLY)
1087                         ocfs2_set_ro_flag(osb, 0);
1088         }
1089
1090         status = ocfs2_verify_heartbeat(osb);
1091         if (status < 0) {
1092                 mlog_errno(status);
1093                 goto read_super_error;
1094         }
1095
1096         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1097                                                  ocfs2_debugfs_root);
1098         if (!osb->osb_debug_root) {
1099                 status = -EINVAL;
1100                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1101                 goto read_super_error;
1102         }
1103
1104         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1105                                             osb->osb_debug_root,
1106                                             osb,
1107                                             &ocfs2_osb_debug_fops);
1108         if (!osb->osb_ctxt) {
1109                 status = -EINVAL;
1110                 mlog_errno(status);
1111                 goto read_super_error;
1112         }
1113
1114         if (ocfs2_meta_ecc(osb)) {
1115                 status = ocfs2_blockcheck_stats_debugfs_install(
1116                                                 &osb->osb_ecc_stats,
1117                                                 osb->osb_debug_root);
1118                 if (status) {
1119                         mlog(ML_ERROR,
1120                              "Unable to create blockcheck statistics "
1121                              "files\n");
1122                         goto read_super_error;
1123                 }
1124         }
1125
1126         status = ocfs2_mount_volume(sb);
1127         if (osb->root_inode)
1128                 inode = igrab(osb->root_inode);
1129
1130         if (status < 0)
1131                 goto read_super_error;
1132
1133         if (!inode) {
1134                 status = -EIO;
1135                 mlog_errno(status);
1136                 goto read_super_error;
1137         }
1138
1139         root = d_alloc_root(inode);
1140         if (!root) {
1141                 status = -ENOMEM;
1142                 mlog_errno(status);
1143                 goto read_super_error;
1144         }
1145
1146         sb->s_root = root;
1147
1148         ocfs2_complete_mount_recovery(osb);
1149
1150         if (ocfs2_mount_local(osb))
1151                 snprintf(nodestr, sizeof(nodestr), "local");
1152         else
1153                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1154
1155         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1156                "with %s data mode.\n",
1157                osb->dev_str, nodestr, osb->slot_num,
1158                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1159                "ordered");
1160
1161         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1162         wake_up(&osb->osb_mount_event);
1163
1164         /* Now we can initialize quotas because we can afford to wait
1165          * for cluster locks recovery now. That also means that truncation
1166          * log recovery can happen but that waits for proper quota setup */
1167         if (!(sb->s_flags & MS_RDONLY)) {
1168                 status = ocfs2_enable_quotas(osb);
1169                 if (status < 0) {
1170                         /* We have to err-out specially here because
1171                          * s_root is already set */
1172                         mlog_errno(status);
1173                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1174                         wake_up(&osb->osb_mount_event);
1175                         mlog_exit(status);
1176                         return status;
1177                 }
1178         }
1179
1180         ocfs2_complete_quota_recovery(osb);
1181
1182         /* Now we wake up again for processes waiting for quotas */
1183         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1184         wake_up(&osb->osb_mount_event);
1185
1186         /* Start this when the mount is almost sure of being successful */
1187         ocfs2_orphan_scan_start(osb);
1188
1189         mlog_exit(status);
1190         return status;
1191
1192 read_super_error:
1193         brelse(bh);
1194
1195         if (inode)
1196                 iput(inode);
1197
1198         if (osb) {
1199                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1200                 wake_up(&osb->osb_mount_event);
1201                 ocfs2_dismount_volume(sb, 1);
1202         }
1203
1204         mlog_exit(status);
1205         return status;
1206 }
1207
1208 static int ocfs2_get_sb(struct file_system_type *fs_type,
1209                         int flags,
1210                         const char *dev_name,
1211                         void *data,
1212                         struct vfsmount *mnt)
1213 {
1214         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1215                            mnt);
1216 }
1217
1218 static void ocfs2_kill_sb(struct super_block *sb)
1219 {
1220         struct ocfs2_super *osb = OCFS2_SB(sb);
1221
1222         /* Failed mount? */
1223         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1224                 goto out;
1225
1226         /* Prevent further queueing of inode drop events */
1227         spin_lock(&dentry_list_lock);
1228         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1229         spin_unlock(&dentry_list_lock);
1230         /* Wait for work to finish and/or remove it */
1231         cancel_work_sync(&osb->dentry_lock_work);
1232 out:
1233         kill_block_super(sb);
1234 }
1235
1236 static struct file_system_type ocfs2_fs_type = {
1237         .owner          = THIS_MODULE,
1238         .name           = "ocfs2",
1239         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1240                                         * the fs? */
1241         .kill_sb        = ocfs2_kill_sb,
1242
1243         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1244         .next           = NULL
1245 };
1246
1247 static int ocfs2_parse_options(struct super_block *sb,
1248                                char *options,
1249                                struct mount_options *mopt,
1250                                int is_remount)
1251 {
1252         int status;
1253         char *p;
1254
1255         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1256                    options ? options : "(none)");
1257
1258         mopt->commit_interval = 0;
1259         mopt->mount_opt = 0;
1260         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1261         mopt->slot = OCFS2_INVALID_SLOT;
1262         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1263         mopt->cluster_stack[0] = '\0';
1264
1265         if (!options) {
1266                 status = 1;
1267                 goto bail;
1268         }
1269
1270         while ((p = strsep(&options, ",")) != NULL) {
1271                 int token, option;
1272                 substring_t args[MAX_OPT_ARGS];
1273
1274                 if (!*p)
1275                         continue;
1276
1277                 token = match_token(p, tokens, args);
1278                 switch (token) {
1279                 case Opt_hb_local:
1280                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1281                         break;
1282                 case Opt_hb_none:
1283                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1284                         break;
1285                 case Opt_barrier:
1286                         if (match_int(&args[0], &option)) {
1287                                 status = 0;
1288                                 goto bail;
1289                         }
1290                         if (option)
1291                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1292                         else
1293                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1294                         break;
1295                 case Opt_intr:
1296                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1297                         break;
1298                 case Opt_nointr:
1299                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1300                         break;
1301                 case Opt_err_panic:
1302                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1303                         break;
1304                 case Opt_err_ro:
1305                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1306                         break;
1307                 case Opt_data_ordered:
1308                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1309                         break;
1310                 case Opt_data_writeback:
1311                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1312                         break;
1313                 case Opt_user_xattr:
1314                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1315                         break;
1316                 case Opt_nouser_xattr:
1317                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1318                         break;
1319                 case Opt_atime_quantum:
1320                         if (match_int(&args[0], &option)) {
1321                                 status = 0;
1322                                 goto bail;
1323                         }
1324                         if (option >= 0)
1325                                 mopt->atime_quantum = option;
1326                         break;
1327                 case Opt_slot:
1328                         option = 0;
1329                         if (match_int(&args[0], &option)) {
1330                                 status = 0;
1331                                 goto bail;
1332                         }
1333                         if (option)
1334                                 mopt->slot = (s16)option;
1335                         break;
1336                 case Opt_commit:
1337                         option = 0;
1338                         if (match_int(&args[0], &option)) {
1339                                 status = 0;
1340                                 goto bail;
1341                         }
1342                         if (option < 0)
1343                                 return 0;
1344                         if (option == 0)
1345                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1346                         mopt->commit_interval = HZ * option;
1347                         break;
1348                 case Opt_localalloc:
1349                         option = 0;
1350                         if (match_int(&args[0], &option)) {
1351                                 status = 0;
1352                                 goto bail;
1353                         }
1354                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1355                                 mopt->localalloc_opt = option;
1356                         break;
1357                 case Opt_localflocks:
1358                         /*
1359                          * Changing this during remount could race
1360                          * flock() requests, or "unbalance" existing
1361                          * ones (e.g., a lock is taken in one mode but
1362                          * dropped in the other). If users care enough
1363                          * to flip locking modes during remount, we
1364                          * could add a "local" flag to individual
1365                          * flock structures for proper tracking of
1366                          * state.
1367                          */
1368                         if (!is_remount)
1369                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1370                         break;
1371                 case Opt_stack:
1372                         /* Check both that the option we were passed
1373                          * is of the right length and that it is a proper
1374                          * string of the right length.
1375                          */
1376                         if (((args[0].to - args[0].from) !=
1377                              OCFS2_STACK_LABEL_LEN) ||
1378                             (strnlen(args[0].from,
1379                                      OCFS2_STACK_LABEL_LEN) !=
1380                              OCFS2_STACK_LABEL_LEN)) {
1381                                 mlog(ML_ERROR,
1382                                      "Invalid cluster_stack option\n");
1383                                 status = 0;
1384                                 goto bail;
1385                         }
1386                         memcpy(mopt->cluster_stack, args[0].from,
1387                                OCFS2_STACK_LABEL_LEN);
1388                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1389                         break;
1390                 case Opt_inode64:
1391                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1392                         break;
1393                 case Opt_usrquota:
1394                         /* We check only on remount, otherwise features
1395                          * aren't yet initialized. */
1396                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1397                             OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1398                                 mlog(ML_ERROR, "User quota requested but "
1399                                      "filesystem feature is not set\n");
1400                                 status = 0;
1401                                 goto bail;
1402                         }
1403                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1404                         break;
1405                 case Opt_grpquota:
1406                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1407                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1408                                 mlog(ML_ERROR, "Group quota requested but "
1409                                      "filesystem feature is not set\n");
1410                                 status = 0;
1411                                 goto bail;
1412                         }
1413                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1414                         break;
1415 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1416                 case Opt_acl:
1417                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1418                         break;
1419                 case Opt_noacl:
1420                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1421                         break;
1422 #else
1423                 case Opt_acl:
1424                 case Opt_noacl:
1425                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
1426                         break;
1427 #endif
1428                 default:
1429                         mlog(ML_ERROR,
1430                              "Unrecognized mount option \"%s\" "
1431                              "or missing value\n", p);
1432                         status = 0;
1433                         goto bail;
1434                 }
1435         }
1436
1437         status = 1;
1438
1439 bail:
1440         mlog_exit(status);
1441         return status;
1442 }
1443
1444 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1445 {
1446         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1447         unsigned long opts = osb->s_mount_opt;
1448         unsigned int local_alloc_megs;
1449
1450         if (opts & OCFS2_MOUNT_HB_LOCAL)
1451                 seq_printf(s, ",_netdev,heartbeat=local");
1452         else
1453                 seq_printf(s, ",heartbeat=none");
1454
1455         if (opts & OCFS2_MOUNT_NOINTR)
1456                 seq_printf(s, ",nointr");
1457
1458         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1459                 seq_printf(s, ",data=writeback");
1460         else
1461                 seq_printf(s, ",data=ordered");
1462
1463         if (opts & OCFS2_MOUNT_BARRIER)
1464                 seq_printf(s, ",barrier=1");
1465
1466         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1467                 seq_printf(s, ",errors=panic");
1468         else
1469                 seq_printf(s, ",errors=remount-ro");
1470
1471         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1472                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1473
1474         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1475                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1476
1477         if (osb->osb_commit_interval)
1478                 seq_printf(s, ",commit=%u",
1479                            (unsigned) (osb->osb_commit_interval / HZ));
1480
1481         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1482         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1483                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1484
1485         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1486                 seq_printf(s, ",localflocks,");
1487
1488         if (osb->osb_cluster_stack[0])
1489                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1490                            osb->osb_cluster_stack);
1491         if (opts & OCFS2_MOUNT_USRQUOTA)
1492                 seq_printf(s, ",usrquota");
1493         if (opts & OCFS2_MOUNT_GRPQUOTA)
1494                 seq_printf(s, ",grpquota");
1495
1496         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1497                 seq_printf(s, ",nouser_xattr");
1498         else
1499                 seq_printf(s, ",user_xattr");
1500
1501         if (opts & OCFS2_MOUNT_INODE64)
1502                 seq_printf(s, ",inode64");
1503
1504 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1505         if (opts & OCFS2_MOUNT_POSIX_ACL)
1506                 seq_printf(s, ",acl");
1507         else
1508                 seq_printf(s, ",noacl");
1509 #endif
1510
1511         return 0;
1512 }
1513
1514 static int __init ocfs2_init(void)
1515 {
1516         int status;
1517
1518         mlog_entry_void();
1519
1520         ocfs2_print_version();
1521
1522         status = init_ocfs2_uptodate_cache();
1523         if (status < 0) {
1524                 mlog_errno(status);
1525                 goto leave;
1526         }
1527
1528         status = ocfs2_initialize_mem_caches();
1529         if (status < 0) {
1530                 mlog_errno(status);
1531                 goto leave;
1532         }
1533
1534         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1535         if (!ocfs2_wq) {
1536                 status = -ENOMEM;
1537                 goto leave;
1538         }
1539
1540         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1541         if (!ocfs2_debugfs_root) {
1542                 status = -EFAULT;
1543                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1544         }
1545
1546         status = ocfs2_quota_setup();
1547         if (status)
1548                 goto leave;
1549
1550         ocfs2_set_locking_protocol();
1551
1552         status = register_quota_format(&ocfs2_quota_format);
1553 leave:
1554         if (status < 0) {
1555                 ocfs2_quota_shutdown();
1556                 ocfs2_free_mem_caches();
1557                 exit_ocfs2_uptodate_cache();
1558         }
1559
1560         mlog_exit(status);
1561
1562         if (status >= 0) {
1563                 return register_filesystem(&ocfs2_fs_type);
1564         } else
1565                 return -1;
1566 }
1567
1568 static void __exit ocfs2_exit(void)
1569 {
1570         mlog_entry_void();
1571
1572         ocfs2_quota_shutdown();
1573
1574         if (ocfs2_wq) {
1575                 flush_workqueue(ocfs2_wq);
1576                 destroy_workqueue(ocfs2_wq);
1577         }
1578
1579         unregister_quota_format(&ocfs2_quota_format);
1580
1581         debugfs_remove(ocfs2_debugfs_root);
1582
1583         ocfs2_free_mem_caches();
1584
1585         unregister_filesystem(&ocfs2_fs_type);
1586
1587         exit_ocfs2_uptodate_cache();
1588
1589         mlog_exit_void();
1590 }
1591
1592 static void ocfs2_put_super(struct super_block *sb)
1593 {
1594         mlog_entry("(0x%p)\n", sb);
1595
1596         lock_kernel();
1597
1598         ocfs2_sync_blockdev(sb);
1599         ocfs2_dismount_volume(sb, 0);
1600
1601         unlock_kernel();
1602
1603         mlog_exit_void();
1604 }
1605
1606 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1607 {
1608         struct ocfs2_super *osb;
1609         u32 numbits, freebits;
1610         int status;
1611         struct ocfs2_dinode *bm_lock;
1612         struct buffer_head *bh = NULL;
1613         struct inode *inode = NULL;
1614
1615         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1616
1617         osb = OCFS2_SB(dentry->d_sb);
1618
1619         inode = ocfs2_get_system_file_inode(osb,
1620                                             GLOBAL_BITMAP_SYSTEM_INODE,
1621                                             OCFS2_INVALID_SLOT);
1622         if (!inode) {
1623                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1624                 status = -EIO;
1625                 goto bail;
1626         }
1627
1628         status = ocfs2_inode_lock(inode, &bh, 0);
1629         if (status < 0) {
1630                 mlog_errno(status);
1631                 goto bail;
1632         }
1633
1634         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1635
1636         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1637         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1638
1639         buf->f_type = OCFS2_SUPER_MAGIC;
1640         buf->f_bsize = dentry->d_sb->s_blocksize;
1641         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1642         buf->f_blocks = ((sector_t) numbits) *
1643                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1644         buf->f_bfree = ((sector_t) freebits) *
1645                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1646         buf->f_bavail = buf->f_bfree;
1647         buf->f_files = numbits;
1648         buf->f_ffree = freebits;
1649
1650         brelse(bh);
1651
1652         ocfs2_inode_unlock(inode, 0);
1653         status = 0;
1654 bail:
1655         if (inode)
1656                 iput(inode);
1657
1658         mlog_exit(status);
1659
1660         return status;
1661 }
1662
1663 static void ocfs2_inode_init_once(void *data)
1664 {
1665         struct ocfs2_inode_info *oi = data;
1666
1667         oi->ip_flags = 0;
1668         oi->ip_open_count = 0;
1669         spin_lock_init(&oi->ip_lock);
1670         ocfs2_extent_map_init(&oi->vfs_inode);
1671         INIT_LIST_HEAD(&oi->ip_io_markers);
1672         oi->ip_dir_start_lookup = 0;
1673
1674         init_rwsem(&oi->ip_alloc_sem);
1675         init_rwsem(&oi->ip_xattr_sem);
1676         mutex_init(&oi->ip_io_mutex);
1677
1678         oi->ip_blkno = 0ULL;
1679         oi->ip_clusters = 0;
1680
1681         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1682         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1683         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1684
1685         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1686                                   &ocfs2_inode_caching_ops);
1687
1688         inode_init_once(&oi->vfs_inode);
1689 }
1690
1691 static int ocfs2_initialize_mem_caches(void)
1692 {
1693         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1694                                        sizeof(struct ocfs2_inode_info),
1695                                        0,
1696                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1697                                                 SLAB_MEM_SPREAD),
1698                                        ocfs2_inode_init_once);
1699         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1700                                         sizeof(struct ocfs2_dquot),
1701                                         0,
1702                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1703                                                 SLAB_MEM_SPREAD),
1704                                         NULL);
1705         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1706                                         sizeof(struct ocfs2_quota_chunk),
1707                                         0,
1708                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1709                                         NULL);
1710         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1711             !ocfs2_qf_chunk_cachep) {
1712                 if (ocfs2_inode_cachep)
1713                         kmem_cache_destroy(ocfs2_inode_cachep);
1714                 if (ocfs2_dquot_cachep)
1715                         kmem_cache_destroy(ocfs2_dquot_cachep);
1716                 if (ocfs2_qf_chunk_cachep)
1717                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1718                 return -ENOMEM;
1719         }
1720
1721         return 0;
1722 }
1723
1724 static void ocfs2_free_mem_caches(void)
1725 {
1726         if (ocfs2_inode_cachep)
1727                 kmem_cache_destroy(ocfs2_inode_cachep);
1728         ocfs2_inode_cachep = NULL;
1729
1730         if (ocfs2_dquot_cachep)
1731                 kmem_cache_destroy(ocfs2_dquot_cachep);
1732         ocfs2_dquot_cachep = NULL;
1733
1734         if (ocfs2_qf_chunk_cachep)
1735                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1736         ocfs2_qf_chunk_cachep = NULL;
1737 }
1738
1739 static int ocfs2_get_sector(struct super_block *sb,
1740                             struct buffer_head **bh,
1741                             int block,
1742                             int sect_size)
1743 {
1744         if (!sb_set_blocksize(sb, sect_size)) {
1745                 mlog(ML_ERROR, "unable to set blocksize\n");
1746                 return -EIO;
1747         }
1748
1749         *bh = sb_getblk(sb, block);
1750         if (!*bh) {
1751                 mlog_errno(-EIO);
1752                 return -EIO;
1753         }
1754         lock_buffer(*bh);
1755         if (!buffer_dirty(*bh))
1756                 clear_buffer_uptodate(*bh);
1757         unlock_buffer(*bh);
1758         ll_rw_block(READ, 1, bh);
1759         wait_on_buffer(*bh);
1760         if (!buffer_uptodate(*bh)) {
1761                 mlog_errno(-EIO);
1762                 brelse(*bh);
1763                 *bh = NULL;
1764                 return -EIO;
1765         }
1766
1767         return 0;
1768 }
1769
1770 static int ocfs2_mount_volume(struct super_block *sb)
1771 {
1772         int status = 0;
1773         int unlock_super = 0;
1774         struct ocfs2_super *osb = OCFS2_SB(sb);
1775
1776         mlog_entry_void();
1777
1778         if (ocfs2_is_hard_readonly(osb))
1779                 goto leave;
1780
1781         status = ocfs2_dlm_init(osb);
1782         if (status < 0) {
1783                 mlog_errno(status);
1784                 goto leave;
1785         }
1786
1787         status = ocfs2_super_lock(osb, 1);
1788         if (status < 0) {
1789                 mlog_errno(status);
1790                 goto leave;
1791         }
1792         unlock_super = 1;
1793
1794         /* This will load up the node map and add ourselves to it. */
1795         status = ocfs2_find_slot(osb);
1796         if (status < 0) {
1797                 mlog_errno(status);
1798                 goto leave;
1799         }
1800
1801         /* load all node-local system inodes */
1802         status = ocfs2_init_local_system_inodes(osb);
1803         if (status < 0) {
1804                 mlog_errno(status);
1805                 goto leave;
1806         }
1807
1808         status = ocfs2_check_volume(osb);
1809         if (status < 0) {
1810                 mlog_errno(status);
1811                 goto leave;
1812         }
1813
1814         status = ocfs2_truncate_log_init(osb);
1815         if (status < 0)
1816                 mlog_errno(status);
1817
1818 leave:
1819         if (unlock_super)
1820                 ocfs2_super_unlock(osb, 1);
1821
1822         mlog_exit(status);
1823         return status;
1824 }
1825
1826 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1827 {
1828         int tmp, hangup_needed = 0;
1829         struct ocfs2_super *osb = NULL;
1830         char nodestr[8];
1831
1832         mlog_entry("(0x%p)\n", sb);
1833
1834         BUG_ON(!sb);
1835         osb = OCFS2_SB(sb);
1836         BUG_ON(!osb);
1837
1838         debugfs_remove(osb->osb_ctxt);
1839
1840         /*
1841          * Flush inode dropping work queue so that deletes are
1842          * performed while the filesystem is still working
1843          */
1844         ocfs2_drop_all_dl_inodes(osb);
1845
1846         /* Orphan scan should be stopped as early as possible */
1847         ocfs2_orphan_scan_stop(osb);
1848
1849         ocfs2_disable_quotas(osb);
1850
1851         ocfs2_shutdown_local_alloc(osb);
1852
1853         ocfs2_truncate_log_shutdown(osb);
1854
1855         /* This will disable recovery and flush any recovery work. */
1856         ocfs2_recovery_exit(osb);
1857
1858         ocfs2_journal_shutdown(osb);
1859
1860         ocfs2_sync_blockdev(sb);
1861
1862         ocfs2_purge_refcount_trees(osb);
1863
1864         /* No cluster connection means we've failed during mount, so skip
1865          * all the steps which depended on that to complete. */
1866         if (osb->cconn) {
1867                 tmp = ocfs2_super_lock(osb, 1);
1868                 if (tmp < 0) {
1869                         mlog_errno(tmp);
1870                         return;
1871                 }
1872         }
1873
1874         if (osb->slot_num != OCFS2_INVALID_SLOT)
1875                 ocfs2_put_slot(osb);
1876
1877         if (osb->cconn)
1878                 ocfs2_super_unlock(osb, 1);
1879
1880         ocfs2_release_system_inodes(osb);
1881
1882         /*
1883          * If we're dismounting due to mount error, mount.ocfs2 will clean
1884          * up heartbeat.  If we're a local mount, there is no heartbeat.
1885          * If we failed before we got a uuid_str yet, we can't stop
1886          * heartbeat.  Otherwise, do it.
1887          */
1888         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1889                 hangup_needed = 1;
1890
1891         if (osb->cconn)
1892                 ocfs2_dlm_shutdown(osb, hangup_needed);
1893
1894         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1895         debugfs_remove(osb->osb_debug_root);
1896
1897         if (hangup_needed)
1898                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1899
1900         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1901
1902         if (ocfs2_mount_local(osb))
1903                 snprintf(nodestr, sizeof(nodestr), "local");
1904         else
1905                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1906
1907         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1908                osb->dev_str, nodestr);
1909
1910         ocfs2_delete_osb(osb);
1911         kfree(osb);
1912         sb->s_dev = 0;
1913         sb->s_fs_info = NULL;
1914 }
1915
1916 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1917                                 unsigned uuid_bytes)
1918 {
1919         int i, ret;
1920         char *ptr;
1921
1922         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1923
1924         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1925         if (osb->uuid_str == NULL)
1926                 return -ENOMEM;
1927
1928         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1929                 /* print with null */
1930                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1931                 if (ret != 2) /* drop super cleans up */
1932                         return -EINVAL;
1933                 /* then only advance past the last char */
1934                 ptr += 2;
1935         }
1936
1937         return 0;
1938 }
1939
1940 static int ocfs2_initialize_super(struct super_block *sb,
1941                                   struct buffer_head *bh,
1942                                   int sector_size,
1943                                   struct ocfs2_blockcheck_stats *stats)
1944 {
1945         int status;
1946         int i, cbits, bbits;
1947         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1948         struct inode *inode = NULL;
1949         struct ocfs2_journal *journal;
1950         __le32 uuid_net_key;
1951         struct ocfs2_super *osb;
1952
1953         mlog_entry_void();
1954
1955         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1956         if (!osb) {
1957                 status = -ENOMEM;
1958                 mlog_errno(status);
1959                 goto bail;
1960         }
1961
1962         sb->s_fs_info = osb;
1963         sb->s_op = &ocfs2_sops;
1964         sb->s_export_op = &ocfs2_export_ops;
1965         sb->s_qcop = &ocfs2_quotactl_ops;
1966         sb->dq_op = &ocfs2_quota_operations;
1967         sb->s_xattr = ocfs2_xattr_handlers;
1968         sb->s_time_gran = 1;
1969         sb->s_flags |= MS_NOATIME;
1970         /* this is needed to support O_LARGEFILE */
1971         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1972         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1973         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1974
1975         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1976
1977         for (i = 0; i < 3; i++)
1978                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1979         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1980
1981         osb->sb = sb;
1982         /* Save off for ocfs2_rw_direct */
1983         osb->s_sectsize_bits = blksize_bits(sector_size);
1984         BUG_ON(!osb->s_sectsize_bits);
1985
1986         spin_lock_init(&osb->dc_task_lock);
1987         init_waitqueue_head(&osb->dc_event);
1988         osb->dc_work_sequence = 0;
1989         osb->dc_wake_sequence = 0;
1990         INIT_LIST_HEAD(&osb->blocked_lock_list);
1991         osb->blocked_lock_count = 0;
1992         spin_lock_init(&osb->osb_lock);
1993         spin_lock_init(&osb->osb_xattr_lock);
1994         ocfs2_init_inode_steal_slot(osb);
1995
1996         atomic_set(&osb->alloc_stats.moves, 0);
1997         atomic_set(&osb->alloc_stats.local_data, 0);
1998         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1999         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2000         atomic_set(&osb->alloc_stats.bg_extends, 0);
2001
2002         /* Copy the blockcheck stats from the superblock probe */
2003         osb->osb_ecc_stats = *stats;
2004
2005         ocfs2_init_node_maps(osb);
2006
2007         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2008                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2009
2010         ocfs2_orphan_scan_init(osb);
2011
2012         status = ocfs2_recovery_init(osb);
2013         if (status) {
2014                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2015                 mlog_errno(status);
2016                 goto bail;
2017         }
2018
2019         init_waitqueue_head(&osb->checkpoint_event);
2020         atomic_set(&osb->needs_checkpoint, 0);
2021
2022         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2023
2024         osb->slot_num = OCFS2_INVALID_SLOT;
2025
2026         osb->s_xattr_inline_size = le16_to_cpu(
2027                                         di->id2.i_super.s_xattr_inline_size);
2028
2029         osb->local_alloc_state = OCFS2_LA_UNUSED;
2030         osb->local_alloc_bh = NULL;
2031         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2032
2033         init_waitqueue_head(&osb->osb_mount_event);
2034
2035         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2036         if (!osb->vol_label) {
2037                 mlog(ML_ERROR, "unable to alloc vol label\n");
2038                 status = -ENOMEM;
2039                 goto bail;
2040         }
2041
2042         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2043         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2044                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2045                      osb->max_slots);
2046                 status = -EINVAL;
2047                 goto bail;
2048         }
2049         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2050
2051         osb->slot_recovery_generations =
2052                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2053                         GFP_KERNEL);
2054         if (!osb->slot_recovery_generations) {
2055                 status = -ENOMEM;
2056                 mlog_errno(status);
2057                 goto bail;
2058         }
2059
2060         init_waitqueue_head(&osb->osb_wipe_event);
2061         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2062                                         sizeof(*osb->osb_orphan_wipes),
2063                                         GFP_KERNEL);
2064         if (!osb->osb_orphan_wipes) {
2065                 status = -ENOMEM;
2066                 mlog_errno(status);
2067                 goto bail;
2068         }
2069
2070         osb->osb_rf_lock_tree = RB_ROOT;
2071
2072         osb->s_feature_compat =
2073                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2074         osb->s_feature_ro_compat =
2075                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2076         osb->s_feature_incompat =
2077                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2078
2079         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2080                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2081                      "optional features (%x).\n", i);
2082                 status = -EINVAL;
2083                 goto bail;
2084         }
2085         if (!(osb->sb->s_flags & MS_RDONLY) &&
2086             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2087                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2088                      "unsupported optional features (%x).\n", i);
2089                 status = -EINVAL;
2090                 goto bail;
2091         }
2092
2093         if (ocfs2_userspace_stack(osb)) {
2094                 memcpy(osb->osb_cluster_stack,
2095                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2096                        OCFS2_STACK_LABEL_LEN);
2097                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2098                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2099                         mlog(ML_ERROR,
2100                              "couldn't mount because of an invalid "
2101                              "cluster stack label (%s) \n",
2102                              osb->osb_cluster_stack);
2103                         status = -EINVAL;
2104                         goto bail;
2105                 }
2106         } else {
2107                 /* The empty string is identical with classic tools that
2108                  * don't know about s_cluster_info. */
2109                 osb->osb_cluster_stack[0] = '\0';
2110         }
2111
2112         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2113
2114         /* FIXME
2115          * This should be done in ocfs2_journal_init(), but unknown
2116          * ordering issues will cause the filesystem to crash.
2117          * If anyone wants to figure out what part of the code
2118          * refers to osb->journal before ocfs2_journal_init() is run,
2119          * be my guest.
2120          */
2121         /* initialize our journal structure */
2122
2123         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2124         if (!journal) {
2125                 mlog(ML_ERROR, "unable to alloc journal\n");
2126                 status = -ENOMEM;
2127                 goto bail;
2128         }
2129         osb->journal = journal;
2130         journal->j_osb = osb;
2131
2132         atomic_set(&journal->j_num_trans, 0);
2133         init_rwsem(&journal->j_trans_barrier);
2134         init_waitqueue_head(&journal->j_checkpointed);
2135         spin_lock_init(&journal->j_lock);
2136         journal->j_trans_id = (unsigned long) 1;
2137         INIT_LIST_HEAD(&journal->j_la_cleanups);
2138         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2139         journal->j_state = OCFS2_JOURNAL_FREE;
2140
2141         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2142         osb->dentry_lock_list = NULL;
2143
2144         /* get some pseudo constants for clustersize bits */
2145         osb->s_clustersize_bits =
2146                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2147         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2148         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2149
2150         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2151             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2152                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2153                      osb->s_clustersize);
2154                 status = -EINVAL;
2155                 goto bail;
2156         }
2157
2158         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2159             > (u32)~0UL) {
2160                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2161                      "what jbd can address in 32 bits.\n");
2162                 status = -EINVAL;
2163                 goto bail;
2164         }
2165
2166         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2167                                  sizeof(di->id2.i_super.s_uuid))) {
2168                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2169                 status = -ENOMEM;
2170                 goto bail;
2171         }
2172
2173         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2174
2175         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2176         osb->vol_label[63] = '\0';
2177         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2178         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2179         osb->first_cluster_group_blkno =
2180                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2181         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2182         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2183         mlog(0, "vol_label: %s\n", osb->vol_label);
2184         mlog(0, "uuid: %s\n", osb->uuid_str);
2185         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2186              (unsigned long long)osb->root_blkno,
2187              (unsigned long long)osb->system_dir_blkno);
2188
2189         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2190         if (!osb->osb_dlm_debug) {
2191                 status = -ENOMEM;
2192                 mlog_errno(status);
2193                 goto bail;
2194         }
2195
2196         atomic_set(&osb->vol_state, VOLUME_INIT);
2197
2198         /* load root, system_dir, and all global system inodes */
2199         status = ocfs2_init_global_system_inodes(osb);
2200         if (status < 0) {
2201                 mlog_errno(status);
2202                 goto bail;
2203         }
2204
2205         /*
2206          * global bitmap
2207          */
2208         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2209                                             OCFS2_INVALID_SLOT);
2210         if (!inode) {
2211                 status = -EINVAL;
2212                 mlog_errno(status);
2213                 goto bail;
2214         }
2215
2216         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2217         iput(inode);
2218
2219         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2220
2221         status = ocfs2_init_slot_info(osb);
2222         if (status < 0) {
2223                 mlog_errno(status);
2224                 goto bail;
2225         }
2226
2227 bail:
2228         mlog_exit(status);
2229         return status;
2230 }
2231
2232 /*
2233  * will return: -EAGAIN if it is ok to keep searching for superblocks
2234  *              -EINVAL if there is a bad superblock
2235  *              0 on success
2236  */
2237 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2238                                struct buffer_head *bh,
2239                                u32 blksz,
2240                                struct ocfs2_blockcheck_stats *stats)
2241 {
2242         int status = -EAGAIN;
2243
2244         mlog_entry_void();
2245
2246         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2247                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2248                 /* We have to do a raw check of the feature here */
2249                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2250                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2251                         status = ocfs2_block_check_validate(bh->b_data,
2252                                                             bh->b_size,
2253                                                             &di->i_check,
2254                                                             stats);
2255                         if (status)
2256                                 goto out;
2257                 }
2258                 status = -EINVAL;
2259                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2260                         mlog(ML_ERROR, "found superblock with incorrect block "
2261                              "size: found %u, should be %u\n",
2262                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2263                                blksz);
2264                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2265                            OCFS2_MAJOR_REV_LEVEL ||
2266                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2267                            OCFS2_MINOR_REV_LEVEL) {
2268                         mlog(ML_ERROR, "found superblock with bad version: "
2269                              "found %u.%u, should be %u.%u\n",
2270                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2271                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2272                              OCFS2_MAJOR_REV_LEVEL,
2273                              OCFS2_MINOR_REV_LEVEL);
2274                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2275                         mlog(ML_ERROR, "bad block number on superblock: "
2276                              "found %llu, should be %llu\n",
2277                              (unsigned long long)le64_to_cpu(di->i_blkno),
2278                              (unsigned long long)bh->b_blocknr);
2279                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2280                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2281                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2282                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2283                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2284                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2285                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2286                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2287                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2288                         mlog(ML_ERROR,
2289                              "Superblock slots found greater than file system "
2290                              "maximum: found %u, max %u\n",
2291                              le16_to_cpu(di->id2.i_super.s_max_slots),
2292                              OCFS2_MAX_SLOTS);
2293                 } else {
2294                         /* found it! */
2295                         status = 0;
2296                 }
2297         }
2298
2299 out:
2300         mlog_exit(status);
2301         return status;
2302 }
2303
2304 static int ocfs2_check_volume(struct ocfs2_super *osb)
2305 {
2306         int status;
2307         int dirty;
2308         int local;
2309         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2310                                                   * recover
2311                                                   * ourselves. */
2312
2313         mlog_entry_void();
2314
2315         /* Init our journal object. */
2316         status = ocfs2_journal_init(osb->journal, &dirty);
2317         if (status < 0) {
2318                 mlog(ML_ERROR, "Could not initialize journal!\n");
2319                 goto finally;
2320         }
2321
2322         /* If the journal was unmounted cleanly then we don't want to
2323          * recover anything. Otherwise, journal_load will do that
2324          * dirty work for us :) */
2325         if (!dirty) {
2326                 status = ocfs2_journal_wipe(osb->journal, 0);
2327                 if (status < 0) {
2328                         mlog_errno(status);
2329                         goto finally;
2330                 }
2331         } else {
2332                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2333                      "recovering volume.\n");
2334         }
2335
2336         local = ocfs2_mount_local(osb);
2337
2338         /* will play back anything left in the journal. */
2339         status = ocfs2_journal_load(osb->journal, local, dirty);
2340         if (status < 0) {
2341                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2342                 goto finally;
2343         }
2344
2345         if (dirty) {
2346                 /* recover my local alloc if we didn't unmount cleanly. */
2347                 status = ocfs2_begin_local_alloc_recovery(osb,
2348                                                           osb->slot_num,
2349                                                           &local_alloc);
2350                 if (status < 0) {
2351                         mlog_errno(status);
2352                         goto finally;
2353                 }
2354                 /* we complete the recovery process after we've marked
2355                  * ourselves as mounted. */
2356         }
2357
2358         mlog(0, "Journal loaded.\n");
2359
2360         status = ocfs2_load_local_alloc(osb);
2361         if (status < 0) {
2362                 mlog_errno(status);
2363                 goto finally;
2364         }
2365
2366         if (dirty) {
2367                 /* Recovery will be completed after we've mounted the
2368                  * rest of the volume. */
2369                 osb->dirty = 1;
2370                 osb->local_alloc_copy = local_alloc;
2371                 local_alloc = NULL;
2372         }
2373
2374         /* go through each journal, trylock it and if you get the
2375          * lock, and it's marked as dirty, set the bit in the recover
2376          * map and launch a recovery thread for it. */
2377         status = ocfs2_mark_dead_nodes(osb);
2378         if (status < 0) {
2379                 mlog_errno(status);
2380                 goto finally;
2381         }
2382
2383         status = ocfs2_compute_replay_slots(osb);
2384         if (status < 0)
2385                 mlog_errno(status);
2386
2387 finally:
2388         if (local_alloc)
2389                 kfree(local_alloc);
2390
2391         mlog_exit(status);
2392         return status;
2393 }
2394
2395 /*
2396  * The routine gets called from dismount or close whenever a dismount on
2397  * volume is requested and the osb open count becomes 1.
2398  * It will remove the osb from the global list and also free up all the
2399  * initialized resources and fileobject.
2400  */
2401 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2402 {
2403         mlog_entry_void();
2404
2405         /* This function assumes that the caller has the main osb resource */
2406
2407         ocfs2_free_slot_info(osb);
2408
2409         kfree(osb->osb_orphan_wipes);
2410         kfree(osb->slot_recovery_generations);
2411         /* FIXME
2412          * This belongs in journal shutdown, but because we have to
2413          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2414          * we free it here.
2415          */
2416         kfree(osb->journal);
2417         if (osb->local_alloc_copy)
2418                 kfree(osb->local_alloc_copy);
2419         kfree(osb->uuid_str);
2420         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2421         memset(osb, 0, sizeof(struct ocfs2_super));
2422
2423         mlog_exit_void();
2424 }
2425
2426 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2427  * panic(). We do not support continue-on-error operation. */
2428 static void ocfs2_handle_error(struct super_block *sb)
2429 {
2430         struct ocfs2_super *osb = OCFS2_SB(sb);
2431
2432         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2433                 panic("OCFS2: (device %s): panic forced after error\n",
2434                       sb->s_id);
2435
2436         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2437
2438         if (sb->s_flags & MS_RDONLY &&
2439             (ocfs2_is_soft_readonly(osb) ||
2440              ocfs2_is_hard_readonly(osb)))
2441                 return;
2442
2443         printk(KERN_CRIT "File system is now read-only due to the potential "
2444                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2445                "system is unmounted.\n");
2446         sb->s_flags |= MS_RDONLY;
2447         ocfs2_set_ro_flag(osb, 0);
2448 }
2449
2450 static char error_buf[1024];
2451
2452 void __ocfs2_error(struct super_block *sb,
2453                    const char *function,
2454                    const char *fmt, ...)
2455 {
2456         va_list args;
2457
2458         va_start(args, fmt);
2459         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2460         va_end(args);
2461
2462         /* Not using mlog here because we want to show the actual
2463          * function the error came from. */
2464         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2465                sb->s_id, function, error_buf);
2466
2467         ocfs2_handle_error(sb);
2468 }
2469
2470 /* Handle critical errors. This is intentionally more drastic than
2471  * ocfs2_handle_error, so we only use for things like journal errors,
2472  * etc. */
2473 void __ocfs2_abort(struct super_block* sb,
2474                    const char *function,
2475                    const char *fmt, ...)
2476 {
2477         va_list args;
2478
2479         va_start(args, fmt);
2480         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2481         va_end(args);
2482
2483         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2484                sb->s_id, function, error_buf);
2485
2486         /* We don't have the cluster support yet to go straight to
2487          * hard readonly in here. Until then, we want to keep
2488          * ocfs2_abort() so that we can at least mark critical
2489          * errors.
2490          *
2491          * TODO: This should abort the journal and alert other nodes
2492          * that our slot needs recovery. */
2493
2494         /* Force a panic(). This stinks, but it's better than letting
2495          * things continue without having a proper hard readonly
2496          * here. */
2497         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2498         ocfs2_handle_error(sb);
2499 }
2500
2501 module_init(ocfs2_init);
2502 module_exit(ocfs2_exit);