fs/ocfs2/super.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/init.h>
  32 #include <linux/random.h>
  33 #include <linux/statfs.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/socket.h>
  37 #include <linux/inet.h>
  38 #include <linux/parser.h>
  39 #include <linux/crc32.h>
  40 #include <linux/debugfs.h>
  41 #include <linux/mount.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/quotaops.h>
  44 #include <linux/smp_lock.h>
  45
  46 #define MLOG_MASK_PREFIX ML_SUPER
  47 #include <cluster/masklog.h>
  48
  49 #include "ocfs2.h"
  50
  51 /* this should be the only file to include a version 1 header */
  52 #include "ocfs1_fs_compat.h"
  53
  54 #include "alloc.h"
  55 #include "blockcheck.h"
  56 #include "dlmglue.h"
  57 #include "export.h"
  58 #include "extent_map.h"
  59 #include "heartbeat.h"
  60 #include "inode.h"
  61 #include "journal.h"
  62 #include "localalloc.h"
  63 #include "namei.h"
  64 #include "slot_map.h"
  65 #include "super.h"
  66 #include "sysfile.h"
  67 #include "uptodate.h"
  68 #include "ver.h"
  69 #include "xattr.h"
  70 #include "quota.h"
  71 #include "refcounttree.h"
  72 #include "suballoc.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         int             localalloc_opt;
  98         unsigned int    resv_level;
  99         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
 100 };
 101
 102 static int ocfs2_parse_options(struct super_block *sb, char *options,
 103                                struct mount_options *mopt,
 104                                int is_remount);
 105 static int ocfs2_check_set_options(struct super_block *sb,
 106                                    struct mount_options *options);
 107 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 108 static void ocfs2_put_super(struct super_block *sb);
 109 static int ocfs2_mount_volume(struct super_block *sb);
 110 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 111 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 112 static int ocfs2_initialize_mem_caches(void);
 113 static void ocfs2_free_mem_caches(void);
 114 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 115
 116 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 117
 118 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 119
 120 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 121 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 122 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 123 static int ocfs2_check_volume(struct ocfs2_super *osb);
 124 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 125                                struct buffer_head *bh,
 126                                u32 sectsize,
 127                                struct ocfs2_blockcheck_stats *stats);
 128 static int ocfs2_initialize_super(struct super_block *sb,
 129                                   struct buffer_head *bh,
 130                                   int sector_size,
 131                                   struct ocfs2_blockcheck_stats *stats);
 132 static int ocfs2_get_sector(struct super_block *sb,
 133                             struct buffer_head **bh,
 134                             int block,
 135                             int sect_size);
 136 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 137 static void ocfs2_destroy_inode(struct inode *inode);
 138 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 139 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 140 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 141
 142 static const struct super_operations ocfs2_sops = {
 143         .statfs         = ocfs2_statfs,
 144         .alloc_inode    = ocfs2_alloc_inode,
 145         .destroy_inode  = ocfs2_destroy_inode,
 146         .drop_inode     = ocfs2_drop_inode,
 147         .clear_inode    = ocfs2_clear_inode,
 148         .delete_inode   = ocfs2_delete_inode,
 149         .sync_fs        = ocfs2_sync_fs,
 150         .put_super      = ocfs2_put_super,
 151         .remount_fs     = ocfs2_remount,
 152         .show_options   = ocfs2_show_options,
 153         .quota_read     = ocfs2_quota_read,
 154         .quota_write    = ocfs2_quota_write,
 155 };
 156
 157 enum {
 158         Opt_barrier,
 159         Opt_err_panic,
 160         Opt_err_ro,
 161         Opt_intr,
 162         Opt_nointr,
 163         Opt_hb_none,
 164         Opt_hb_local,
 165         Opt_data_ordered,
 166         Opt_data_writeback,
 167         Opt_atime_quantum,
 168         Opt_slot,
 169         Opt_commit,
 170         Opt_localalloc,
 171         Opt_localflocks,
 172         Opt_stack,
 173         Opt_user_xattr,
 174         Opt_nouser_xattr,
 175         Opt_inode64,
 176         Opt_acl,
 177         Opt_noacl,
 178         Opt_usrquota,
 179         Opt_grpquota,
 180         Opt_resv_level,
 181         Opt_err,
 182 };
 183
 184 static const match_table_t tokens = {
 185         {Opt_barrier, "barrier=%u"},
 186         {Opt_err_panic, "errors=panic"},
 187         {Opt_err_ro, "errors=remount-ro"},
 188         {Opt_intr, "intr"},
 189         {Opt_nointr, "nointr"},
 190         {Opt_hb_none, OCFS2_HB_NONE},
 191         {Opt_hb_local, OCFS2_HB_LOCAL},
 192         {Opt_data_ordered, "data=ordered"},
 193         {Opt_data_writeback, "data=writeback"},
 194         {Opt_atime_quantum, "atime_quantum=%u"},
 195         {Opt_slot, "preferred_slot=%u"},
 196         {Opt_commit, "commit=%u"},
 197         {Opt_localalloc, "localalloc=%d"},
 198         {Opt_localflocks, "localflocks"},
 199         {Opt_stack, "cluster_stack=%s"},
 200         {Opt_user_xattr, "user_xattr"},
 201         {Opt_nouser_xattr, "nouser_xattr"},
 202         {Opt_inode64, "inode64"},
 203         {Opt_acl, "acl"},
 204         {Opt_noacl, "noacl"},
 205         {Opt_usrquota, "usrquota"},
 206         {Opt_grpquota, "grpquota"},
 207         {Opt_resv_level, "resv_level=%u"},
 208         {Opt_err, NULL}
 209 };
 210
 211 #ifdef CONFIG_DEBUG_FS
 212 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 213 {
 214         struct ocfs2_cluster_connection *cconn = osb->cconn;
 215         struct ocfs2_recovery_map *rm = osb->recovery_map;
 216         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 217         int i, out = 0;
 218
 219         out += snprintf(buf + out, len - out,
 220                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 221                         "Device", osb->dev_str, osb->uuid_str,
 222                         osb->fs_generation, osb->vol_label);
 223
 224         out += snprintf(buf + out, len - out,
 225                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 226                         atomic_read(&osb->vol_state), osb->osb_flags);
 227
 228         out += snprintf(buf + out, len - out,
 229                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 230                         osb->sb->s_blocksize, osb->s_clustersize);
 231
 232         out += snprintf(buf + out, len - out,
 233                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 234                         "ROcompat: 0x%X\n",
 235                         "Features", osb->s_feature_compat,
 236                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 237
 238         out += snprintf(buf + out, len - out,
 239                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 240                         osb->s_mount_opt, osb->s_atime_quantum);
 241
 242         if (cconn) {
 243                 out += snprintf(buf + out, len - out,
 244                                 "%10s => Stack: %s  Name: %*s  "
 245                                 "Version: %d.%d\n", "Cluster",
 246                                 (*osb->osb_cluster_stack == '\0' ?
 247                                  "o2cb" : osb->osb_cluster_stack),
 248                                 cconn->cc_namelen, cconn->cc_name,
 249                                 cconn->cc_version.pv_major,
 250                                 cconn->cc_version.pv_minor);
 251         }
 252
 253         spin_lock(&osb->dc_task_lock);
 254         out += snprintf(buf + out, len - out,
 255                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 256                         "WorkSeq: %lu\n", "DownCnvt",
 257                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 258                         osb->blocked_lock_count, osb->dc_wake_sequence,
 259                         osb->dc_work_sequence);
 260         spin_unlock(&osb->dc_task_lock);
 261
 262         spin_lock(&osb->osb_lock);
 263         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 264                         "Recovery",
 265                         (osb->recovery_thread_task ?
 266                          task_pid_nr(osb->recovery_thread_task) : -1));
 267         if (rm->rm_used == 0)
 268                 out += snprintf(buf + out, len - out, " None\n");
 269         else {
 270                 for (i = 0; i < rm->rm_used; i++)
 271                         out += snprintf(buf + out, len - out, " %d",
 272                                         rm->rm_entries[i]);
 273                 out += snprintf(buf + out, len - out, "\n");
 274         }
 275         spin_unlock(&osb->osb_lock);
 276
 277         out += snprintf(buf + out, len - out,
 278                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 279                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 280                         osb->osb_commit_interval,
 281                         atomic_read(&osb->needs_checkpoint));
 282
 283         out += snprintf(buf + out, len - out,
 284                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 285                         "Journal", osb->journal->j_state,
 286                         osb->journal->j_trans_id,
 287                         atomic_read(&osb->journal->j_num_trans));
 288
 289         out += snprintf(buf + out, len - out,
 290                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 291                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 292                         "Stats",
 293                         atomic_read(&osb->alloc_stats.bitmap_data),
 294                         atomic_read(&osb->alloc_stats.local_data),
 295                         atomic_read(&osb->alloc_stats.bg_allocs),
 296                         atomic_read(&osb->alloc_stats.moves),
 297                         atomic_read(&osb->alloc_stats.bg_extends));
 298
 299         out += snprintf(buf + out, len - out,
 300                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 301                         "Default: %u bits\n",
 302                         "LocalAlloc", osb->local_alloc_state,
 303                         (unsigned long long)osb->la_last_gd,
 304                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 305
 306         spin_lock(&osb->osb_lock);
 307         out += snprintf(buf + out, len - out,
 308                         "%10s => InodeSlot: %d  StolenInodes: %d, "
 309                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
 310                         osb->s_inode_steal_slot,
 311                         atomic_read(&osb->s_num_inodes_stolen),
 312                         osb->s_meta_steal_slot,
 313                         atomic_read(&osb->s_num_meta_stolen));
 314         spin_unlock(&osb->osb_lock);
 315
 316         out += snprintf(buf + out, len - out, "OrphanScan => ");
 317         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 318                         os->os_count, os->os_seqno);
 319         out += snprintf(buf + out, len - out, " Last Scan: ");
 320         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 321                 out += snprintf(buf + out, len - out, "Disabled\n");
 322         else
 323                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 324                                 (get_seconds() - os->os_scantime.tv_sec));
 325
 326         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 327                         "Slots", "Num", "RecoGen");
 328         for (i = 0; i < osb->max_slots; ++i) {
 329                 out += snprintf(buf + out, len - out,
 330                                 "%10s  %c %3d  %10d\n",
 331                                 " ",
 332                                 (i == osb->slot_num ? '*' : ' '),
 333                                 i, osb->slot_recovery_generations[i]);
 334         }
 335
 336         return out;
 337 }
 338
 339 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 340 {
 341         struct ocfs2_super *osb = inode->i_private;
 342         char *buf = NULL;
 343
 344         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 345         if (!buf)
 346                 goto bail;
 347
 348         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 349
 350         file->private_data = buf;
 351
 352         return 0;
 353 bail:
 354         return -ENOMEM;
 355 }
 356
 357 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 358 {
 359         kfree(file->private_data);
 360         return 0;
 361 }
 362
 363 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 364                                 size_t nbytes, loff_t *ppos)
 365 {
 366         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 367                                        i_size_read(file->f_mapping->host));
 368 }
 369 #else
 370 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 371 {
 372         return 0;
 373 }
 374 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 375 {
 376         return 0;
 377 }
 378 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 379                                 size_t nbytes, loff_t *ppos)
 380 {
 381         return 0;
 382 }
 383 #endif  /* CONFIG_DEBUG_FS */
 384
 385 static const struct file_operations ocfs2_osb_debug_fops = {
 386         .open =         ocfs2_osb_debug_open,
 387         .release =      ocfs2_debug_release,
 388         .read =         ocfs2_debug_read,
 389         .llseek =       generic_file_llseek,
 390 };
 391
 392 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 393 {
 394         int status;
 395         tid_t target;
 396         struct ocfs2_super *osb = OCFS2_SB(sb);
 397
 398         if (ocfs2_is_hard_readonly(osb))
 399                 return -EROFS;
 400
 401         if (wait) {
 402                 status = ocfs2_flush_truncate_log(osb);
 403                 if (status < 0)
 404                         mlog_errno(status);
 405         } else {
 406                 ocfs2_schedule_truncate_log_flush(osb, 0);
 407         }
 408
 409         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 410                                       &target)) {
 411                 if (wait)
 412                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 413                                              target);
 414         }
 415         return 0;
 416 }
 417
 418 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 419 {
 420         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 421             && (ino == USER_QUOTA_SYSTEM_INODE
 422                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 423                 return 0;
 424         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 425             && (ino == GROUP_QUOTA_SYSTEM_INODE
 426                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 427                 return 0;
 428         return 1;
 429 }
 430
 431 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 432 {
 433         struct inode *new = NULL;
 434         int status = 0;
 435         int i;
 436
 437         mlog_entry_void();
 438
 439         new = ocfs2_iget(osb, osb->root_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->root_inode = new;
 446
 447         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 448         if (IS_ERR(new)) {
 449                 status = PTR_ERR(new);
 450                 mlog_errno(status);
 451                 goto bail;
 452         }
 453         osb->sys_root_inode = new;
 454
 455         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 456              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 457                 if (!ocfs2_need_system_inode(osb, i))
 458                         continue;
 459                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 460                 if (!new) {
 461                         ocfs2_release_system_inodes(osb);
 462                         status = -EINVAL;
 463                         mlog_errno(status);
 464                         /* FIXME: Should ERROR_RO_FS */
 465                         mlog(ML_ERROR, "Unable to load system inode %d, "
 466                              "possibly corrupt fs?", i);
 467                         goto bail;
 468                 }
 469                 // the array now has one ref, so drop this one
 470                 iput(new);
 471         }
 472
 473 bail:
 474         mlog_exit(status);
 475         return status;
 476 }
 477
 478 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 479 {
 480         struct inode *new = NULL;
 481         int status = 0;
 482         int i;
 483
 484         mlog_entry_void();
 485
 486         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 487              i < NUM_SYSTEM_INODES;
 488              i++) {
 489                 if (!ocfs2_need_system_inode(osb, i))
 490                         continue;
 491                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 492                 if (!new) {
 493                         ocfs2_release_system_inodes(osb);
 494                         status = -EINVAL;
 495                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 496                              status, i, osb->slot_num);
 497                         goto bail;
 498                 }
 499                 /* the array now has one ref, so drop this one */
 500                 iput(new);
 501         }
 502
 503 bail:
 504         mlog_exit(status);
 505         return status;
 506 }
 507
 508 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 509 {
 510         int i;
 511         struct inode *inode;
 512
 513         mlog_entry_void();
 514
 515         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 516                 inode = osb->system_inodes[i];
 517                 if (inode) {
 518                         iput(inode);
 519                         osb->system_inodes[i] = NULL;
 520                 }
 521         }
 522
 523         inode = osb->sys_root_inode;
 524         if (inode) {
 525                 iput(inode);
 526                 osb->sys_root_inode = NULL;
 527         }
 528
 529         inode = osb->root_inode;
 530         if (inode) {
 531                 iput(inode);
 532                 osb->root_inode = NULL;
 533         }
 534
 535         mlog_exit(0);
 536 }
 537
 538 /* We're allocating fs objects, use GFP_NOFS */
 539 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 540 {
 541         struct ocfs2_inode_info *oi;
 542
 543         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 544         if (!oi)
 545                 return NULL;
 546
 547         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 548         return &oi->vfs_inode;
 549 }
 550
 551 static void ocfs2_destroy_inode(struct inode *inode)
 552 {
 553         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 554 }
 555
 556 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 557                                                 unsigned int cbits)
 558 {
 559         unsigned int bytes = 1 << cbits;
 560         unsigned int trim = bytes;
 561         unsigned int bitshift = 32;
 562
 563         /*
 564          * i_size and all block offsets in ocfs2 are always 64 bits
 565          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 566          * 64 bit platforms, cluster size will be the limiting factor.
 567          */
 568
 569 #if BITS_PER_LONG == 32
 570 # if defined(CONFIG_LBDAF)
 571         BUILD_BUG_ON(sizeof(sector_t) != 8);
 572         /*
 573          * We might be limited by page cache size.
 574          */
 575         if (bytes > PAGE_CACHE_SIZE) {
 576                 bytes = PAGE_CACHE_SIZE;
 577                 trim = 1;
 578                 /*
 579                  * Shift by 31 here so that we don't get larger than
 580                  * MAX_LFS_FILESIZE
 581                  */
 582                 bitshift = 31;
 583         }
 584 # else
 585         /*
 586          * We are limited by the size of sector_t. Use block size, as
 587          * that's what we expose to the VFS.
 588          */
 589         bytes = 1 << bbits;
 590         trim = 1;
 591         bitshift = 31;
 592 # endif
 593 #endif
 594
 595         /*
 596          * Trim by a whole cluster when we can actually approach the
 597          * on-disk limits. Otherwise we can overflow i_clusters when
 598          * an extent start is at the max offset.
 599          */
 600         return (((unsigned long long)bytes) << bitshift) - trim;
 601 }
 602
 603 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 604 {
 605         int incompat_features;
 606         int ret = 0;
 607         struct mount_options parsed_options;
 608         struct ocfs2_super *osb = OCFS2_SB(sb);
 609
 610         lock_kernel();
 611
 612         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
 613             !ocfs2_check_set_options(sb, &parsed_options)) {
 614                 ret = -EINVAL;
 615                 goto out;
 616         }
 617
 618         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 619             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 620                 ret = -EINVAL;
 621                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 622                 goto out;
 623         }
 624
 625         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 626             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 627                 ret = -EINVAL;
 628                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 629                 goto out;
 630         }
 631
 632         /* Probably don't want this on remount; it might
 633          * mess with other nodes */
 634         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 635             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 636                 ret = -EINVAL;
 637                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 638                 goto out;
 639         }
 640
 641         /* We're going to/from readonly mode. */
 642         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 643                 /* Disable quota accounting before remounting RO */
 644                 if (*flags & MS_RDONLY) {
 645                         ret = ocfs2_susp_quotas(osb, 0);
 646                         if (ret < 0)
 647                                 goto out;
 648                 }
 649                 /* Lock here so the check of HARD_RO and the potential
 650                  * setting of SOFT_RO is atomic. */
 651                 spin_lock(&osb->osb_lock);
 652                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 653                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 654                         ret = -EROFS;
 655                         goto unlock_osb;
 656                 }
 657
 658                 if (*flags & MS_RDONLY) {
 659                         mlog(0, "Going to ro mode.\n");
 660                         sb->s_flags |= MS_RDONLY;
 661                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 662                 } else {
 663                         mlog(0, "Making ro filesystem writeable.\n");
 664
 665                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 666                                 mlog(ML_ERROR, "Cannot remount RDWR "
 667                                      "filesystem due to previous errors.\n");
 668                                 ret = -EROFS;
 669                                 goto unlock_osb;
 670                         }
 671                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 672                         if (incompat_features) {
 673                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 674                                      "of unsupported optional features "
 675                                      "(%x).\n", incompat_features);
 676                                 ret = -EINVAL;
 677                                 goto unlock_osb;
 678                         }
 679                         sb->s_flags &= ~MS_RDONLY;
 680                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 681                 }
 682 unlock_osb:
 683                 spin_unlock(&osb->osb_lock);
 684                 /* Enable quota accounting after remounting RW */
 685                 if (!ret && !(*flags & MS_RDONLY)) {
 686                         if (sb_any_quota_suspended(sb))
 687                                 ret = ocfs2_susp_quotas(osb, 1);
 688                         else
 689                                 ret = ocfs2_enable_quotas(osb);
 690                         if (ret < 0) {
 691                                 /* Return back changes... */
 692                                 spin_lock(&osb->osb_lock);
 693                                 sb->s_flags |= MS_RDONLY;
 694                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 695                                 spin_unlock(&osb->osb_lock);
 696                                 goto out;
 697                         }
 698                 }
 699         }
 700
 701         if (!ret) {
 702                 /* Only save off the new mount options in case of a successful
 703                  * remount. */
 704                 osb->s_mount_opt = parsed_options.mount_opt;
 705                 osb->s_atime_quantum = parsed_options.atime_quantum;
 706                 osb->preferred_slot = parsed_options.slot;
 707                 if (parsed_options.commit_interval)
 708                         osb->osb_commit_interval = parsed_options.commit_interval;
 709
 710                 if (!ocfs2_is_hard_readonly(osb))
 711                         ocfs2_set_journal_params(osb);
 712
 713                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 714                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
 715                                                         MS_POSIXACL : 0);
 716         }
 717 out:
 718         unlock_kernel();
 719         return ret;
 720 }
 721
 722 static int ocfs2_sb_probe(struct super_block *sb,
 723                           struct buffer_head **bh,
 724                           int *sector_size,
 725                           struct ocfs2_blockcheck_stats *stats)
 726 {
 727         int status, tmpstat;
 728         struct ocfs1_vol_disk_hdr *hdr;
 729         struct ocfs2_dinode *di;
 730         int blksize;
 731
 732         *bh = NULL;
 733
 734         /* may be > 512 */
 735         *sector_size = bdev_logical_block_size(sb->s_bdev);
 736         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 737                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 738                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 739                 status = -EINVAL;
 740                 goto bail;
 741         }
 742
 743         /* Can this really happen? */
 744         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 745                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 746
 747         /* check block zero for old format */
 748         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 749         if (status < 0) {
 750                 mlog_errno(status);
 751                 goto bail;
 752         }
 753         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 754         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 755                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 756                      hdr->major_version, hdr->minor_version);
 757                 status = -EINVAL;
 758         }
 759         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 760                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 761                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 762                      hdr->signature);
 763                 status = -EINVAL;
 764         }
 765         brelse(*bh);
 766         *bh = NULL;
 767         if (status < 0) {
 768                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 769                      "upgraded before mounting with ocfs v2\n");
 770                 goto bail;
 771         }
 772
 773         /*
 774          * Now check at magic offset for 512, 1024, 2048, 4096
 775          * blocksizes.  4096 is the maximum blocksize because it is
 776          * the minimum clustersize.
 777          */
 778         status = -EINVAL;
 779         for (blksize = *sector_size;
 780              blksize <= OCFS2_MAX_BLOCKSIZE;
 781              blksize <<= 1) {
 782                 tmpstat = ocfs2_get_sector(sb, bh,
 783                                            OCFS2_SUPER_BLOCK_BLKNO,
 784                                            blksize);
 785                 if (tmpstat < 0) {
 786                         status = tmpstat;
 787                         mlog_errno(status);
 788                         break;
 789                 }
 790                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 791                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 792                 spin_lock_init(&stats->b_lock);
 793                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 794                 if (tmpstat < 0) {
 795                         brelse(*bh);
 796                         *bh = NULL;
 797                 }
 798                 if (tmpstat != -EAGAIN) {
 799                         status = tmpstat;
 800                         break;
 801                 }
 802         }
 803
 804 bail:
 805         return status;
 806 }
 807
 808 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 809 {
 810         if (ocfs2_mount_local(osb)) {
 811                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 812                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 813                              "mounted device.\n");
 814                         return -EINVAL;
 815                 }
 816         }
 817
 818         if (ocfs2_userspace_stack(osb)) {
 819                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 820                         mlog(ML_ERROR, "Userspace stack expected, but "
 821                              "o2cb heartbeat arguments passed to mount\n");
 822                         return -EINVAL;
 823                 }
 824         }
 825
 826         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 827                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 828                     !ocfs2_userspace_stack(osb)) {
 829                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 830                              "a read-write clustered device.\n");
 831                         return -EINVAL;
 832                 }
 833         }
 834
 835         return 0;
 836 }
 837
 838 /*
 839  * If we're using a userspace stack, mount should have passed
 840  * a name that matches the disk.  If not, mount should not
 841  * have passed a stack.
 842  */
 843 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 844                                         struct mount_options *mopt)
 845 {
 846         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 847                 mlog(ML_ERROR,
 848                      "cluster stack passed to mount, but this filesystem "
 849                      "does not support it\n");
 850                 return -EINVAL;
 851         }
 852
 853         if (ocfs2_userspace_stack(osb) &&
 854             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 855                     OCFS2_STACK_LABEL_LEN)) {
 856                 mlog(ML_ERROR,
 857                      "cluster stack passed to mount (\"%s\") does not "
 858                      "match the filesystem (\"%s\")\n",
 859                      mopt->cluster_stack,
 860                      osb->osb_cluster_stack);
 861                 return -EINVAL;
 862         }
 863
 864         return 0;
 865 }
 866
 867 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 868 {
 869         int type;
 870         struct super_block *sb = osb->sb;
 871         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 872                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 873         int status = 0;
 874
 875         for (type = 0; type < MAXQUOTAS; type++) {
 876                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 877                         continue;
 878                 if (unsuspend)
 879                         status = vfs_quota_enable(
 880                                         sb_dqopt(sb)->files[type],
 881                                         type, QFMT_OCFS2,
 882                                         DQUOT_SUSPENDED);
 883                 else
 884                         status = vfs_quota_disable(sb, type,
 885                                                    DQUOT_SUSPENDED);
 886                 if (status < 0)
 887                         break;
 888         }
 889         if (status < 0)
 890                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 891                      "remount (error = %d).\n", status);
 892         return status;
 893 }
 894
 895 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 896 {
 897         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 898         struct super_block *sb = osb->sb;
 899         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 900                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 901         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 902                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 903         int status;
 904         int type;
 905
 906         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 907         for (type = 0; type < MAXQUOTAS; type++) {
 908                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 909                         continue;
 910                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 911                                                         osb->slot_num);
 912                 if (!inode[type]) {
 913                         status = -ENOENT;
 914                         goto out_quota_off;
 915                 }
 916                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 917                                                 DQUOT_USAGE_ENABLED);
 918                 if (status < 0)
 919                         goto out_quota_off;
 920         }
 921
 922         for (type = 0; type < MAXQUOTAS; type++)
 923                 iput(inode[type]);
 924         return 0;
 925 out_quota_off:
 926         ocfs2_disable_quotas(osb);
 927         for (type = 0; type < MAXQUOTAS; type++)
 928                 iput(inode[type]);
 929         mlog_errno(status);
 930         return status;
 931 }
 932
 933 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 934 {
 935         int type;
 936         struct inode *inode;
 937         struct super_block *sb = osb->sb;
 938
 939         /* We mostly ignore errors in this function because there's not much
 940          * we can do when we see them */
 941         for (type = 0; type < MAXQUOTAS; type++) {
 942                 if (!sb_has_quota_loaded(sb, type))
 943                         continue;
 944                 inode = igrab(sb->s_dquot.files[type]);
 945                 /* Turn off quotas. This will remove all dquot structures from
 946                  * memory and so they will be automatically synced to global
 947                  * quota files */
 948                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 949                                             DQUOT_LIMITS_ENABLED);
 950                 if (!inode)
 951                         continue;
 952                 iput(inode);
 953         }
 954 }
 955
 956 /* Handle quota on quotactl */
 957 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 958                           char *path, int remount)
 959 {
 960         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 961                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 962
 963         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 964                 return -EINVAL;
 965
 966         if (remount)
 967                 return 0;       /* Just ignore it has been handled in
 968                                  * ocfs2_remount() */
 969         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 970                                     format_id, DQUOT_LIMITS_ENABLED);
 971 }
 972
 973 /* Handle quota off quotactl */
 974 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 975 {
 976         if (remount)
 977                 return 0;       /* Ignore now and handle later in
 978                                  * ocfs2_remount() */
 979         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 980 }
 981
 982 static const struct quotactl_ops ocfs2_quotactl_ops = {
 983         .quota_on       = ocfs2_quota_on,
 984         .quota_off      = ocfs2_quota_off,
 985         .quota_sync     = vfs_quota_sync,
 986         .get_info       = vfs_get_dqinfo,
 987         .set_info       = vfs_set_dqinfo,
 988         .get_dqblk      = vfs_get_dqblk,
 989         .set_dqblk      = vfs_set_dqblk,
 990 };
 991
 992 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 993 {
 994         struct dentry *root;
 995         int status, sector_size;
 996         struct mount_options parsed_options;
 997         struct inode *inode = NULL;
 998         struct ocfs2_super *osb = NULL;
 999         struct buffer_head *bh = NULL;
1000         char nodestr[8];
1001         struct ocfs2_blockcheck_stats stats;
1002
1003         mlog_entry("%p, %p, %i", sb, data, silent);
1004
1005         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1006                 status = -EINVAL;
1007                 goto read_super_error;
1008         }
1009
1010         /* probe for superblock */
1011         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1012         if (status < 0) {
1013                 mlog(ML_ERROR, "superblock probe failed!\n");
1014                 goto read_super_error;
1015         }
1016
1017         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1018         osb = OCFS2_SB(sb);
1019         if (status < 0) {
1020                 mlog_errno(status);
1021                 goto read_super_error;
1022         }
1023         brelse(bh);
1024         bh = NULL;
1025
1026         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1027                 status = -EINVAL;
1028                 goto read_super_error;
1029         }
1030         osb->s_mount_opt = parsed_options.mount_opt;
1031         osb->s_atime_quantum = parsed_options.atime_quantum;
1032         osb->preferred_slot = parsed_options.slot;
1033         osb->osb_commit_interval = parsed_options.commit_interval;
1034
1035         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1036         osb->osb_resv_level = parsed_options.resv_level;
1037
1038         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1039         if (status)
1040                 goto read_super_error;
1041
1042         sb->s_magic = OCFS2_SUPER_MAGIC;
1043
1044         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1045                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1046
1047         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1048          * heartbeat=none */
1049         if (bdev_read_only(sb->s_bdev)) {
1050                 if (!(sb->s_flags & MS_RDONLY)) {
1051                         status = -EACCES;
1052                         mlog(ML_ERROR, "Readonly device detected but readonly "
1053                              "mount was not specified.\n");
1054                         goto read_super_error;
1055                 }
1056
1057                 /* You should not be able to start a local heartbeat
1058                  * on a readonly device. */
1059                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1060                         status = -EROFS;
1061                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1062                              "device.\n");
1063                         goto read_super_error;
1064                 }
1065
1066                 status = ocfs2_check_journals_nolocks(osb);
1067                 if (status < 0) {
1068                         if (status == -EROFS)
1069                                 mlog(ML_ERROR, "Recovery required on readonly "
1070                                      "file system, but write access is "
1071                                      "unavailable.\n");
1072                         else
1073                                 mlog_errno(status);
1074                         goto read_super_error;
1075                 }
1076
1077                 ocfs2_set_ro_flag(osb, 1);
1078
1079                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1080                        "services will be utilized for this mount. Recovery "
1081                        "will be skipped.\n");
1082         }
1083
1084         if (!ocfs2_is_hard_readonly(osb)) {
1085                 if (sb->s_flags & MS_RDONLY)
1086                         ocfs2_set_ro_flag(osb, 0);
1087         }
1088
1089         status = ocfs2_verify_heartbeat(osb);
1090         if (status < 0) {
1091                 mlog_errno(status);
1092                 goto read_super_error;
1093         }
1094
1095         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1096                                                  ocfs2_debugfs_root);
1097         if (!osb->osb_debug_root) {
1098                 status = -EINVAL;
1099                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1100                 goto read_super_error;
1101         }
1102
1103         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1104                                             osb->osb_debug_root,
1105                                             osb,
1106                                             &ocfs2_osb_debug_fops);
1107         if (!osb->osb_ctxt) {
1108                 status = -EINVAL;
1109                 mlog_errno(status);
1110                 goto read_super_error;
1111         }
1112
1113         if (ocfs2_meta_ecc(osb)) {
1114                 status = ocfs2_blockcheck_stats_debugfs_install(
1115                                                 &osb->osb_ecc_stats,
1116                                                 osb->osb_debug_root);
1117                 if (status) {
1118                         mlog(ML_ERROR,
1119                              "Unable to create blockcheck statistics "
1120                              "files\n");
1121                         goto read_super_error;
1122                 }
1123         }
1124
1125         status = ocfs2_mount_volume(sb);
1126         if (osb->root_inode)
1127                 inode = igrab(osb->root_inode);
1128
1129         if (status < 0)
1130                 goto read_super_error;
1131
1132         if (!inode) {
1133                 status = -EIO;
1134                 mlog_errno(status);
1135                 goto read_super_error;
1136         }
1137
1138         root = d_alloc_root(inode);
1139         if (!root) {
1140                 status = -ENOMEM;
1141                 mlog_errno(status);
1142                 goto read_super_error;
1143         }
1144
1145         sb->s_root = root;
1146
1147         ocfs2_complete_mount_recovery(osb);
1148
1149         if (ocfs2_mount_local(osb))
1150                 snprintf(nodestr, sizeof(nodestr), "local");
1151         else
1152                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1153
1154         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1155                "with %s data mode.\n",
1156                osb->dev_str, nodestr, osb->slot_num,
1157                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1158                "ordered");
1159
1160         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1161         wake_up(&osb->osb_mount_event);
1162
1163         /* Now we can initialize quotas because we can afford to wait
1164          * for cluster locks recovery now. That also means that truncation
1165          * log recovery can happen but that waits for proper quota setup */
1166         if (!(sb->s_flags & MS_RDONLY)) {
1167                 status = ocfs2_enable_quotas(osb);
1168                 if (status < 0) {
1169                         /* We have to err-out specially here because
1170                          * s_root is already set */
1171                         mlog_errno(status);
1172                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1173                         wake_up(&osb->osb_mount_event);
1174                         mlog_exit(status);
1175                         return status;
1176                 }
1177         }
1178
1179         ocfs2_complete_quota_recovery(osb);
1180
1181         /* Now we wake up again for processes waiting for quotas */
1182         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1183         wake_up(&osb->osb_mount_event);
1184
1185         /* Start this when the mount is almost sure of being successful */
1186         ocfs2_orphan_scan_start(osb);
1187
1188         mlog_exit(status);
1189         return status;
1190
1191 read_super_error:
1192         brelse(bh);
1193
1194         if (inode)
1195                 iput(inode);
1196
1197         if (osb) {
1198                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1199                 wake_up(&osb->osb_mount_event);
1200                 ocfs2_dismount_volume(sb, 1);
1201         }
1202
1203         mlog_exit(status);
1204         return status;
1205 }
1206
1207 static int ocfs2_get_sb(struct file_system_type *fs_type,
1208                         int flags,
1209                         const char *dev_name,
1210                         void *data,
1211                         struct vfsmount *mnt)
1212 {
1213         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1214                            mnt);
1215 }
1216
1217 static void ocfs2_kill_sb(struct super_block *sb)
1218 {
1219         struct ocfs2_super *osb = OCFS2_SB(sb);
1220
1221         /* Failed mount? */
1222         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1223                 goto out;
1224
1225         /* Prevent further queueing of inode drop events */
1226         spin_lock(&dentry_list_lock);
1227         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1228         spin_unlock(&dentry_list_lock);
1229         /* Wait for work to finish and/or remove it */
1230         cancel_work_sync(&osb->dentry_lock_work);
1231 out:
1232         kill_block_super(sb);
1233 }
1234
1235 static struct file_system_type ocfs2_fs_type = {
1236         .owner          = THIS_MODULE,
1237         .name           = "ocfs2",
1238         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1239                                         * the fs? */
1240         .kill_sb        = ocfs2_kill_sb,
1241
1242         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1243         .next           = NULL
1244 };
1245
1246 static int ocfs2_check_set_options(struct super_block *sb,
1247                                    struct mount_options *options)
1248 {
1249         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1250             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1251                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1252                 mlog(ML_ERROR, "User quotas were requested, but this "
1253                      "filesystem does not have the feature enabled.\n");
1254                 return 0;
1255         }
1256         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1257             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1258                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1259                 mlog(ML_ERROR, "Group quotas were requested, but this "
1260                      "filesystem does not have the feature enabled.\n");
1261                 return 0;
1262         }
1263         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1264             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1265                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1266                      "feature is not enabled\n");
1267                 return 0;
1268         }
1269         /* No ACL setting specified? Use XATTR feature... */
1270         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1271                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1272                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1273                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1274                 else
1275                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1276         }
1277         return 1;
1278 }
1279
1280 static int ocfs2_parse_options(struct super_block *sb,
1281                                char *options,
1282                                struct mount_options *mopt,
1283                                int is_remount)
1284 {
1285         int status;
1286         char *p;
1287
1288         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1289                    options ? options : "(none)");
1290
1291         mopt->commit_interval = 0;
1292         mopt->mount_opt = 0;
1293         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1294         mopt->slot = OCFS2_INVALID_SLOT;
1295         mopt->localalloc_opt = -1;
1296         mopt->cluster_stack[0] = '\0';
1297         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1298
1299         if (!options) {
1300                 status = 1;
1301                 goto bail;
1302         }
1303
1304         while ((p = strsep(&options, ",")) != NULL) {
1305                 int token, option;
1306                 substring_t args[MAX_OPT_ARGS];
1307
1308                 if (!*p)
1309                         continue;
1310
1311                 token = match_token(p, tokens, args);
1312                 switch (token) {
1313                 case Opt_hb_local:
1314                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1315                         break;
1316                 case Opt_hb_none:
1317                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1318                         break;
1319                 case Opt_barrier:
1320                         if (match_int(&args[0], &option)) {
1321                                 status = 0;
1322                                 goto bail;
1323                         }
1324                         if (option)
1325                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1326                         else
1327                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1328                         break;
1329                 case Opt_intr:
1330                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1331                         break;
1332                 case Opt_nointr:
1333                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1334                         break;
1335                 case Opt_err_panic:
1336                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1337                         break;
1338                 case Opt_err_ro:
1339                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1340                         break;
1341                 case Opt_data_ordered:
1342                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1343                         break;
1344                 case Opt_data_writeback:
1345                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1346                         break;
1347                 case Opt_user_xattr:
1348                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1349                         break;
1350                 case Opt_nouser_xattr:
1351                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1352                         break;
1353                 case Opt_atime_quantum:
1354                         if (match_int(&args[0], &option)) {
1355                                 status = 0;
1356                                 goto bail;
1357                         }
1358                         if (option >= 0)
1359                                 mopt->atime_quantum = option;
1360                         break;
1361                 case Opt_slot:
1362                         option = 0;
1363                         if (match_int(&args[0], &option)) {
1364                                 status = 0;
1365                                 goto bail;
1366                         }
1367                         if (option)
1368                                 mopt->slot = (s16)option;
1369                         break;
1370                 case Opt_commit:
1371                         option = 0;
1372                         if (match_int(&args[0], &option)) {
1373                                 status = 0;
1374                                 goto bail;
1375                         }
1376                         if (option < 0)
1377                                 return 0;
1378                         if (option == 0)
1379                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1380                         mopt->commit_interval = HZ * option;
1381                         break;
1382                 case Opt_localalloc:
1383                         option = 0;
1384                         if (match_int(&args[0], &option)) {
1385                                 status = 0;
1386                                 goto bail;
1387                         }
1388                         if (option >= 0)
1389                                 mopt->localalloc_opt = option;
1390                         break;
1391                 case Opt_localflocks:
1392                         /*
1393                          * Changing this during remount could race
1394                          * flock() requests, or "unbalance" existing
1395                          * ones (e.g., a lock is taken in one mode but
1396                          * dropped in the other). If users care enough
1397                          * to flip locking modes during remount, we
1398                          * could add a "local" flag to individual
1399                          * flock structures for proper tracking of
1400                          * state.
1401                          */
1402                         if (!is_remount)
1403                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1404                         break;
1405                 case Opt_stack:
1406                         /* Check both that the option we were passed
1407                          * is of the right length and that it is a proper
1408                          * string of the right length.
1409                          */
1410                         if (((args[0].to - args[0].from) !=
1411                              OCFS2_STACK_LABEL_LEN) ||
1412                             (strnlen(args[0].from,
1413                                      OCFS2_STACK_LABEL_LEN) !=
1414                              OCFS2_STACK_LABEL_LEN)) {
1415                                 mlog(ML_ERROR,
1416                                      "Invalid cluster_stack option\n");
1417                                 status = 0;
1418                                 goto bail;
1419                         }
1420                         memcpy(mopt->cluster_stack, args[0].from,
1421                                OCFS2_STACK_LABEL_LEN);
1422                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1423                         break;
1424                 case Opt_inode64:
1425                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1426                         break;
1427                 case Opt_usrquota:
1428                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1429                         break;
1430                 case Opt_grpquota:
1431                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1432                         break;
1433                 case Opt_acl:
1434                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1435                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1436                         break;
1437                 case Opt_noacl:
1438                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1439                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1440                         break;
1441                 case Opt_resv_level:
1442                         if (is_remount)
1443                                 break;
1444                         if (match_int(&args[0], &option)) {
1445                                 status = 0;
1446                                 goto bail;
1447                         }
1448                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1449                             option < OCFS2_MAX_RESV_LEVEL)
1450                                 mopt->resv_level = option;
1451                         break;
1452                 default:
1453                         mlog(ML_ERROR,
1454                              "Unrecognized mount option \"%s\" "
1455                              "or missing value\n", p);
1456                         status = 0;
1457                         goto bail;
1458                 }
1459         }
1460
1461         status = 1;
1462
1463 bail:
1464         mlog_exit(status);
1465         return status;
1466 }
1467
1468 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1469 {
1470         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1471         unsigned long opts = osb->s_mount_opt;
1472         unsigned int local_alloc_megs;
1473
1474         if (opts & OCFS2_MOUNT_HB_LOCAL)
1475                 seq_printf(s, ",_netdev,heartbeat=local");
1476         else
1477                 seq_printf(s, ",heartbeat=none");
1478
1479         if (opts & OCFS2_MOUNT_NOINTR)
1480                 seq_printf(s, ",nointr");
1481
1482         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1483                 seq_printf(s, ",data=writeback");
1484         else
1485                 seq_printf(s, ",data=ordered");
1486
1487         if (opts & OCFS2_MOUNT_BARRIER)
1488                 seq_printf(s, ",barrier=1");
1489
1490         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1491                 seq_printf(s, ",errors=panic");
1492         else
1493                 seq_printf(s, ",errors=remount-ro");
1494
1495         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1496                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1497
1498         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1499                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1500
1501         if (osb->osb_commit_interval)
1502                 seq_printf(s, ",commit=%u",
1503                            (unsigned) (osb->osb_commit_interval / HZ));
1504
1505         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1506         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1507                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1508
1509         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1510                 seq_printf(s, ",localflocks,");
1511
1512         if (osb->osb_cluster_stack[0])
1513                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1514                            osb->osb_cluster_stack);
1515         if (opts & OCFS2_MOUNT_USRQUOTA)
1516                 seq_printf(s, ",usrquota");
1517         if (opts & OCFS2_MOUNT_GRPQUOTA)
1518                 seq_printf(s, ",grpquota");
1519
1520         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1521                 seq_printf(s, ",nouser_xattr");
1522         else
1523                 seq_printf(s, ",user_xattr");
1524
1525         if (opts & OCFS2_MOUNT_INODE64)
1526                 seq_printf(s, ",inode64");
1527
1528         if (opts & OCFS2_MOUNT_POSIX_ACL)
1529                 seq_printf(s, ",acl");
1530         else
1531                 seq_printf(s, ",noacl");
1532
1533         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1534                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1535
1536         return 0;
1537 }
1538
1539 static int __init ocfs2_init(void)
1540 {
1541         int status;
1542
1543         mlog_entry_void();
1544
1545         ocfs2_print_version();
1546
1547         status = init_ocfs2_uptodate_cache();
1548         if (status < 0) {
1549                 mlog_errno(status);
1550                 goto leave;
1551         }
1552
1553         status = ocfs2_initialize_mem_caches();
1554         if (status < 0) {
1555                 mlog_errno(status);
1556                 goto leave;
1557         }
1558
1559         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1560         if (!ocfs2_wq) {
1561                 status = -ENOMEM;
1562                 goto leave;
1563         }
1564
1565         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1566         if (!ocfs2_debugfs_root) {
1567                 status = -EFAULT;
1568                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1569         }
1570
1571         status = ocfs2_quota_setup();
1572         if (status)
1573                 goto leave;
1574
1575         ocfs2_set_locking_protocol();
1576
1577         status = register_quota_format(&ocfs2_quota_format);
1578 leave:
1579         if (status < 0) {
1580                 ocfs2_quota_shutdown();
1581                 ocfs2_free_mem_caches();
1582                 exit_ocfs2_uptodate_cache();
1583         }
1584
1585         mlog_exit(status);
1586
1587         if (status >= 0) {
1588                 return register_filesystem(&ocfs2_fs_type);
1589         } else
1590                 return -1;
1591 }
1592
1593 static void __exit ocfs2_exit(void)
1594 {
1595         mlog_entry_void();
1596
1597         ocfs2_quota_shutdown();
1598
1599         if (ocfs2_wq) {
1600                 flush_workqueue(ocfs2_wq);
1601                 destroy_workqueue(ocfs2_wq);
1602         }
1603
1604         unregister_quota_format(&ocfs2_quota_format);
1605
1606         debugfs_remove(ocfs2_debugfs_root);
1607
1608         ocfs2_free_mem_caches();
1609
1610         unregister_filesystem(&ocfs2_fs_type);
1611
1612         exit_ocfs2_uptodate_cache();
1613
1614         mlog_exit_void();
1615 }
1616
1617 static void ocfs2_put_super(struct super_block *sb)
1618 {
1619         mlog_entry("(0x%p)\n", sb);
1620
1621         lock_kernel();
1622
1623         ocfs2_sync_blockdev(sb);
1624         ocfs2_dismount_volume(sb, 0);
1625
1626         unlock_kernel();
1627
1628         mlog_exit_void();
1629 }
1630
1631 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1632 {
1633         struct ocfs2_super *osb;
1634         u32 numbits, freebits;
1635         int status;
1636         struct ocfs2_dinode *bm_lock;
1637         struct buffer_head *bh = NULL;
1638         struct inode *inode = NULL;
1639
1640         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1641
1642         osb = OCFS2_SB(dentry->d_sb);
1643
1644         inode = ocfs2_get_system_file_inode(osb,
1645                                             GLOBAL_BITMAP_SYSTEM_INODE,
1646                                             OCFS2_INVALID_SLOT);
1647         if (!inode) {
1648                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1649                 status = -EIO;
1650                 goto bail;
1651         }
1652
1653         status = ocfs2_inode_lock(inode, &bh, 0);
1654         if (status < 0) {
1655                 mlog_errno(status);
1656                 goto bail;
1657         }
1658
1659         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1660
1661         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1662         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1663
1664         buf->f_type = OCFS2_SUPER_MAGIC;
1665         buf->f_bsize = dentry->d_sb->s_blocksize;
1666         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1667         buf->f_blocks = ((sector_t) numbits) *
1668                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1669         buf->f_bfree = ((sector_t) freebits) *
1670                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1671         buf->f_bavail = buf->f_bfree;
1672         buf->f_files = numbits;
1673         buf->f_ffree = freebits;
1674         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1675                                 & 0xFFFFFFFFUL;
1676         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1677                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1678
1679         brelse(bh);
1680
1681         ocfs2_inode_unlock(inode, 0);
1682         status = 0;
1683 bail:
1684         if (inode)
1685                 iput(inode);
1686
1687         mlog_exit(status);
1688
1689         return status;
1690 }
1691
1692 static void ocfs2_inode_init_once(void *data)
1693 {
1694         struct ocfs2_inode_info *oi = data;
1695
1696         oi->ip_flags = 0;
1697         oi->ip_open_count = 0;
1698         spin_lock_init(&oi->ip_lock);
1699         ocfs2_extent_map_init(&oi->vfs_inode);
1700         INIT_LIST_HEAD(&oi->ip_io_markers);
1701         oi->ip_dir_start_lookup = 0;
1702
1703         init_rwsem(&oi->ip_alloc_sem);
1704         init_rwsem(&oi->ip_xattr_sem);
1705         mutex_init(&oi->ip_io_mutex);
1706
1707         oi->ip_blkno = 0ULL;
1708         oi->ip_clusters = 0;
1709
1710         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1711
1712         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1713         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1714         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1715
1716         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1717                                   &ocfs2_inode_caching_ops);
1718
1719         inode_init_once(&oi->vfs_inode);
1720 }
1721
1722 static int ocfs2_initialize_mem_caches(void)
1723 {
1724         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1725                                        sizeof(struct ocfs2_inode_info),
1726                                        0,
1727                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1728                                                 SLAB_MEM_SPREAD),
1729                                        ocfs2_inode_init_once);
1730         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1731                                         sizeof(struct ocfs2_dquot),
1732                                         0,
1733                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1734                                                 SLAB_MEM_SPREAD),
1735                                         NULL);
1736         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1737                                         sizeof(struct ocfs2_quota_chunk),
1738                                         0,
1739                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1740                                         NULL);
1741         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1742             !ocfs2_qf_chunk_cachep) {
1743                 if (ocfs2_inode_cachep)
1744                         kmem_cache_destroy(ocfs2_inode_cachep);
1745                 if (ocfs2_dquot_cachep)
1746                         kmem_cache_destroy(ocfs2_dquot_cachep);
1747                 if (ocfs2_qf_chunk_cachep)
1748                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1749                 return -ENOMEM;
1750         }
1751
1752         return 0;
1753 }
1754
1755 static void ocfs2_free_mem_caches(void)
1756 {
1757         if (ocfs2_inode_cachep)
1758                 kmem_cache_destroy(ocfs2_inode_cachep);
1759         ocfs2_inode_cachep = NULL;
1760
1761         if (ocfs2_dquot_cachep)
1762                 kmem_cache_destroy(ocfs2_dquot_cachep);
1763         ocfs2_dquot_cachep = NULL;
1764
1765         if (ocfs2_qf_chunk_cachep)
1766                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1767         ocfs2_qf_chunk_cachep = NULL;
1768 }
1769
1770 static int ocfs2_get_sector(struct super_block *sb,
1771                             struct buffer_head **bh,
1772                             int block,
1773                             int sect_size)
1774 {
1775         if (!sb_set_blocksize(sb, sect_size)) {
1776                 mlog(ML_ERROR, "unable to set blocksize\n");
1777                 return -EIO;
1778         }
1779
1780         *bh = sb_getblk(sb, block);
1781         if (!*bh) {
1782                 mlog_errno(-EIO);
1783                 return -EIO;
1784         }
1785         lock_buffer(*bh);
1786         if (!buffer_dirty(*bh))
1787                 clear_buffer_uptodate(*bh);
1788         unlock_buffer(*bh);
1789         ll_rw_block(READ, 1, bh);
1790         wait_on_buffer(*bh);
1791         if (!buffer_uptodate(*bh)) {
1792                 mlog_errno(-EIO);
1793                 brelse(*bh);
1794                 *bh = NULL;
1795                 return -EIO;
1796         }
1797
1798         return 0;
1799 }
1800
1801 static int ocfs2_mount_volume(struct super_block *sb)
1802 {
1803         int status = 0;
1804         int unlock_super = 0;
1805         struct ocfs2_super *osb = OCFS2_SB(sb);
1806
1807         mlog_entry_void();
1808
1809         if (ocfs2_is_hard_readonly(osb))
1810                 goto leave;
1811
1812         status = ocfs2_dlm_init(osb);
1813         if (status < 0) {
1814                 mlog_errno(status);
1815                 goto leave;
1816         }
1817
1818         status = ocfs2_super_lock(osb, 1);
1819         if (status < 0) {
1820                 mlog_errno(status);
1821                 goto leave;
1822         }
1823         unlock_super = 1;
1824
1825         /* This will load up the node map and add ourselves to it. */
1826         status = ocfs2_find_slot(osb);
1827         if (status < 0) {
1828                 mlog_errno(status);
1829                 goto leave;
1830         }
1831
1832         /* load all node-local system inodes */
1833         status = ocfs2_init_local_system_inodes(osb);
1834         if (status < 0) {
1835                 mlog_errno(status);
1836                 goto leave;
1837         }
1838
1839         status = ocfs2_check_volume(osb);
1840         if (status < 0) {
1841                 mlog_errno(status);
1842                 goto leave;
1843         }
1844
1845         status = ocfs2_truncate_log_init(osb);
1846         if (status < 0)
1847                 mlog_errno(status);
1848
1849 leave:
1850         if (unlock_super)
1851                 ocfs2_super_unlock(osb, 1);
1852
1853         mlog_exit(status);
1854         return status;
1855 }
1856
1857 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1858 {
1859         int tmp, hangup_needed = 0;
1860         struct ocfs2_super *osb = NULL;
1861         char nodestr[8];
1862
1863         mlog_entry("(0x%p)\n", sb);
1864
1865         BUG_ON(!sb);
1866         osb = OCFS2_SB(sb);
1867         BUG_ON(!osb);
1868
1869         debugfs_remove(osb->osb_ctxt);
1870
1871         /*
1872          * Flush inode dropping work queue so that deletes are
1873          * performed while the filesystem is still working
1874          */
1875         ocfs2_drop_all_dl_inodes(osb);
1876
1877         /* Orphan scan should be stopped as early as possible */
1878         ocfs2_orphan_scan_stop(osb);
1879
1880         ocfs2_disable_quotas(osb);
1881
1882         ocfs2_shutdown_local_alloc(osb);
1883
1884         ocfs2_truncate_log_shutdown(osb);
1885
1886         /* This will disable recovery and flush any recovery work. */
1887         ocfs2_recovery_exit(osb);
1888
1889         ocfs2_journal_shutdown(osb);
1890
1891         ocfs2_sync_blockdev(sb);
1892
1893         ocfs2_purge_refcount_trees(osb);
1894
1895         /* No cluster connection means we've failed during mount, so skip
1896          * all the steps which depended on that to complete. */
1897         if (osb->cconn) {
1898                 tmp = ocfs2_super_lock(osb, 1);
1899                 if (tmp < 0) {
1900                         mlog_errno(tmp);
1901                         return;
1902                 }
1903         }
1904
1905         if (osb->slot_num != OCFS2_INVALID_SLOT)
1906                 ocfs2_put_slot(osb);
1907
1908         if (osb->cconn)
1909                 ocfs2_super_unlock(osb, 1);
1910
1911         ocfs2_release_system_inodes(osb);
1912
1913         /*
1914          * If we're dismounting due to mount error, mount.ocfs2 will clean
1915          * up heartbeat.  If we're a local mount, there is no heartbeat.
1916          * If we failed before we got a uuid_str yet, we can't stop
1917          * heartbeat.  Otherwise, do it.
1918          */
1919         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1920                 hangup_needed = 1;
1921
1922         if (osb->cconn)
1923                 ocfs2_dlm_shutdown(osb, hangup_needed);
1924
1925         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1926         debugfs_remove(osb->osb_debug_root);
1927
1928         if (hangup_needed)
1929                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1930
1931         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1932
1933         if (ocfs2_mount_local(osb))
1934                 snprintf(nodestr, sizeof(nodestr), "local");
1935         else
1936                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1937
1938         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1939                osb->dev_str, nodestr);
1940
1941         ocfs2_delete_osb(osb);
1942         kfree(osb);
1943         sb->s_dev = 0;
1944         sb->s_fs_info = NULL;
1945 }
1946
1947 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1948                                 unsigned uuid_bytes)
1949 {
1950         int i, ret;
1951         char *ptr;
1952
1953         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1954
1955         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1956         if (osb->uuid_str == NULL)
1957                 return -ENOMEM;
1958
1959         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1960                 /* print with null */
1961                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1962                 if (ret != 2) /* drop super cleans up */
1963                         return -EINVAL;
1964                 /* then only advance past the last char */
1965                 ptr += 2;
1966         }
1967
1968         return 0;
1969 }
1970
1971 static int ocfs2_initialize_super(struct super_block *sb,
1972                                   struct buffer_head *bh,
1973                                   int sector_size,
1974                                   struct ocfs2_blockcheck_stats *stats)
1975 {
1976         int status;
1977         int i, cbits, bbits;
1978         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1979         struct inode *inode = NULL;
1980         struct ocfs2_journal *journal;
1981         __le32 uuid_net_key;
1982         struct ocfs2_super *osb;
1983
1984         mlog_entry_void();
1985
1986         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1987         if (!osb) {
1988                 status = -ENOMEM;
1989                 mlog_errno(status);
1990                 goto bail;
1991         }
1992
1993         sb->s_fs_info = osb;
1994         sb->s_op = &ocfs2_sops;
1995         sb->s_export_op = &ocfs2_export_ops;
1996         sb->s_qcop = &ocfs2_quotactl_ops;
1997         sb->dq_op = &ocfs2_quota_operations;
1998         sb->s_xattr = ocfs2_xattr_handlers;
1999         sb->s_time_gran = 1;
2000         sb->s_flags |= MS_NOATIME;
2001         /* this is needed to support O_LARGEFILE */
2002         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2003         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2004         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2005
2006         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2007
2008         for (i = 0; i < 3; i++)
2009                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2010         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2011
2012         osb->sb = sb;
2013         /* Save off for ocfs2_rw_direct */
2014         osb->s_sectsize_bits = blksize_bits(sector_size);
2015         BUG_ON(!osb->s_sectsize_bits);
2016
2017         spin_lock_init(&osb->dc_task_lock);
2018         init_waitqueue_head(&osb->dc_event);
2019         osb->dc_work_sequence = 0;
2020         osb->dc_wake_sequence = 0;
2021         INIT_LIST_HEAD(&osb->blocked_lock_list);
2022         osb->blocked_lock_count = 0;
2023         spin_lock_init(&osb->osb_lock);
2024         spin_lock_init(&osb->osb_xattr_lock);
2025         ocfs2_init_steal_slots(osb);
2026
2027         atomic_set(&osb->alloc_stats.moves, 0);
2028         atomic_set(&osb->alloc_stats.local_data, 0);
2029         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2030         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2031         atomic_set(&osb->alloc_stats.bg_extends, 0);
2032
2033         /* Copy the blockcheck stats from the superblock probe */
2034         osb->osb_ecc_stats = *stats;
2035
2036         ocfs2_init_node_maps(osb);
2037
2038         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2039                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2040
2041         ocfs2_orphan_scan_init(osb);
2042
2043         status = ocfs2_recovery_init(osb);
2044         if (status) {
2045                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2046                 mlog_errno(status);
2047                 goto bail;
2048         }
2049
2050         init_waitqueue_head(&osb->checkpoint_event);
2051         atomic_set(&osb->needs_checkpoint, 0);
2052
2053         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2054
2055         osb->slot_num = OCFS2_INVALID_SLOT;
2056
2057         osb->s_xattr_inline_size = le16_to_cpu(
2058                                         di->id2.i_super.s_xattr_inline_size);
2059
2060         osb->local_alloc_state = OCFS2_LA_UNUSED;
2061         osb->local_alloc_bh = NULL;
2062         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2063
2064         init_waitqueue_head(&osb->osb_mount_event);
2065
2066         status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2067         if (status) {
2068                 mlog_errno(status);
2069                 goto bail;
2070         }
2071
2072         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2073         if (!osb->vol_label) {
2074                 mlog(ML_ERROR, "unable to alloc vol label\n");
2075                 status = -ENOMEM;
2076                 goto bail;
2077         }
2078
2079         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2080         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2081                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2082                      osb->max_slots);
2083                 status = -EINVAL;
2084                 goto bail;
2085         }
2086         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2087
2088         osb->slot_recovery_generations =
2089                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2090                         GFP_KERNEL);
2091         if (!osb->slot_recovery_generations) {
2092                 status = -ENOMEM;
2093                 mlog_errno(status);
2094                 goto bail;
2095         }
2096
2097         init_waitqueue_head(&osb->osb_wipe_event);
2098         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2099                                         sizeof(*osb->osb_orphan_wipes),
2100                                         GFP_KERNEL);
2101         if (!osb->osb_orphan_wipes) {
2102                 status = -ENOMEM;
2103                 mlog_errno(status);
2104                 goto bail;
2105         }
2106
2107         osb->osb_rf_lock_tree = RB_ROOT;
2108
2109         osb->s_feature_compat =
2110                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2111         osb->s_feature_ro_compat =
2112                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2113         osb->s_feature_incompat =
2114                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2115
2116         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2117                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2118                      "optional features (%x).\n", i);
2119                 status = -EINVAL;
2120                 goto bail;
2121         }
2122         if (!(osb->sb->s_flags & MS_RDONLY) &&
2123             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2124                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2125                      "unsupported optional features (%x).\n", i);
2126                 status = -EINVAL;
2127                 goto bail;
2128         }
2129
2130         if (ocfs2_userspace_stack(osb)) {
2131                 memcpy(osb->osb_cluster_stack,
2132                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2133                        OCFS2_STACK_LABEL_LEN);
2134                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2135                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2136                         mlog(ML_ERROR,
2137                              "couldn't mount because of an invalid "
2138                              "cluster stack label (%s) \n",
2139                              osb->osb_cluster_stack);
2140                         status = -EINVAL;
2141                         goto bail;
2142                 }
2143         } else {
2144                 /* The empty string is identical with classic tools that
2145                  * don't know about s_cluster_info. */
2146                 osb->osb_cluster_stack[0] = '\0';
2147         }
2148
2149         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2150
2151         /* FIXME
2152          * This should be done in ocfs2_journal_init(), but unknown
2153          * ordering issues will cause the filesystem to crash.
2154          * If anyone wants to figure out what part of the code
2155          * refers to osb->journal before ocfs2_journal_init() is run,
2156          * be my guest.
2157          */
2158         /* initialize our journal structure */
2159
2160         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2161         if (!journal) {
2162                 mlog(ML_ERROR, "unable to alloc journal\n");
2163                 status = -ENOMEM;
2164                 goto bail;
2165         }
2166         osb->journal = journal;
2167         journal->j_osb = osb;
2168
2169         atomic_set(&journal->j_num_trans, 0);
2170         init_rwsem(&journal->j_trans_barrier);
2171         init_waitqueue_head(&journal->j_checkpointed);
2172         spin_lock_init(&journal->j_lock);
2173         journal->j_trans_id = (unsigned long) 1;
2174         INIT_LIST_HEAD(&journal->j_la_cleanups);
2175         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2176         journal->j_state = OCFS2_JOURNAL_FREE;
2177
2178         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2179         osb->dentry_lock_list = NULL;
2180
2181         /* get some pseudo constants for clustersize bits */
2182         osb->s_clustersize_bits =
2183                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2184         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2185         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2186
2187         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2188             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2189                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2190                      osb->s_clustersize);
2191                 status = -EINVAL;
2192                 goto bail;
2193         }
2194
2195         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2196             > (u32)~0UL) {
2197                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2198                      "what jbd can address in 32 bits.\n");
2199                 status = -EINVAL;
2200                 goto bail;
2201         }
2202
2203         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2204                                  sizeof(di->id2.i_super.s_uuid))) {
2205                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2206                 status = -ENOMEM;
2207                 goto bail;
2208         }
2209
2210         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2211
2212         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2213         osb->vol_label[63] = '\0';
2214         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2215         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2216         osb->first_cluster_group_blkno =
2217                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2218         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2219         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2220         mlog(0, "vol_label: %s\n", osb->vol_label);
2221         mlog(0, "uuid: %s\n", osb->uuid_str);
2222         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2223              (unsigned long long)osb->root_blkno,
2224              (unsigned long long)osb->system_dir_blkno);
2225
2226         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2227         if (!osb->osb_dlm_debug) {
2228                 status = -ENOMEM;
2229                 mlog_errno(status);
2230                 goto bail;
2231         }
2232
2233         atomic_set(&osb->vol_state, VOLUME_INIT);
2234
2235         /* load root, system_dir, and all global system inodes */
2236         status = ocfs2_init_global_system_inodes(osb);
2237         if (status < 0) {
2238                 mlog_errno(status);
2239                 goto bail;
2240         }
2241
2242         /*
2243          * global bitmap
2244          */
2245         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2246                                             OCFS2_INVALID_SLOT);
2247         if (!inode) {
2248                 status = -EINVAL;
2249                 mlog_errno(status);
2250                 goto bail;
2251         }
2252
2253         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2254         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2255         iput(inode);
2256
2257         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2258
2259         status = ocfs2_init_slot_info(osb);
2260         if (status < 0) {
2261                 mlog_errno(status);
2262                 goto bail;
2263         }
2264
2265 bail:
2266         mlog_exit(status);
2267         return status;
2268 }
2269
2270 /*
2271  * will return: -EAGAIN if it is ok to keep searching for superblocks
2272  *              -EINVAL if there is a bad superblock
2273  *              0 on success
2274  */
2275 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2276                                struct buffer_head *bh,
2277                                u32 blksz,
2278                                struct ocfs2_blockcheck_stats *stats)
2279 {
2280         int status = -EAGAIN;
2281
2282         mlog_entry_void();
2283
2284         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2285                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2286                 /* We have to do a raw check of the feature here */
2287                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2288                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2289                         status = ocfs2_block_check_validate(bh->b_data,
2290                                                             bh->b_size,
2291                                                             &di->i_check,
2292                                                             stats);
2293                         if (status)
2294                                 goto out;
2295                 }
2296                 status = -EINVAL;
2297                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2298                         mlog(ML_ERROR, "found superblock with incorrect block "
2299                              "size: found %u, should be %u\n",
2300                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2301                                blksz);
2302                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2303                            OCFS2_MAJOR_REV_LEVEL ||
2304                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2305                            OCFS2_MINOR_REV_LEVEL) {
2306                         mlog(ML_ERROR, "found superblock with bad version: "
2307                              "found %u.%u, should be %u.%u\n",
2308                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2309                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2310                              OCFS2_MAJOR_REV_LEVEL,
2311                              OCFS2_MINOR_REV_LEVEL);
2312                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2313                         mlog(ML_ERROR, "bad block number on superblock: "
2314                              "found %llu, should be %llu\n",
2315                              (unsigned long long)le64_to_cpu(di->i_blkno),
2316                              (unsigned long long)bh->b_blocknr);
2317                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2318                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2319                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2320                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2321                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2322                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2323                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2324                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2325                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2326                         mlog(ML_ERROR,
2327                              "Superblock slots found greater than file system "
2328                              "maximum: found %u, max %u\n",
2329                              le16_to_cpu(di->id2.i_super.s_max_slots),
2330                              OCFS2_MAX_SLOTS);
2331                 } else {
2332                         /* found it! */
2333                         status = 0;
2334                 }
2335         }
2336
2337 out:
2338         mlog_exit(status);
2339         return status;
2340 }
2341
2342 static int ocfs2_check_volume(struct ocfs2_super *osb)
2343 {
2344         int status;
2345         int dirty;
2346         int local;
2347         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2348                                                   * recover
2349                                                   * ourselves. */
2350
2351         mlog_entry_void();
2352
2353         /* Init our journal object. */
2354         status = ocfs2_journal_init(osb->journal, &dirty);
2355         if (status < 0) {
2356                 mlog(ML_ERROR, "Could not initialize journal!\n");
2357                 goto finally;
2358         }
2359
2360         /* If the journal was unmounted cleanly then we don't want to
2361          * recover anything. Otherwise, journal_load will do that
2362          * dirty work for us :) */
2363         if (!dirty) {
2364                 status = ocfs2_journal_wipe(osb->journal, 0);
2365                 if (status < 0) {
2366                         mlog_errno(status);
2367                         goto finally;
2368                 }
2369         } else {
2370                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2371                      "recovering volume.\n");
2372         }
2373
2374         local = ocfs2_mount_local(osb);
2375
2376         /* will play back anything left in the journal. */
2377         status = ocfs2_journal_load(osb->journal, local, dirty);
2378         if (status < 0) {
2379                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2380                 goto finally;
2381         }
2382
2383         if (dirty) {
2384                 /* recover my local alloc if we didn't unmount cleanly. */
2385                 status = ocfs2_begin_local_alloc_recovery(osb,
2386                                                           osb->slot_num,
2387                                                           &local_alloc);
2388                 if (status < 0) {
2389                         mlog_errno(status);
2390                         goto finally;
2391                 }
2392                 /* we complete the recovery process after we've marked
2393                  * ourselves as mounted. */
2394         }
2395
2396         mlog(0, "Journal loaded.\n");
2397
2398         status = ocfs2_load_local_alloc(osb);
2399         if (status < 0) {
2400                 mlog_errno(status);
2401                 goto finally;
2402         }
2403
2404         if (dirty) {
2405                 /* Recovery will be completed after we've mounted the
2406                  * rest of the volume. */
2407                 osb->dirty = 1;
2408                 osb->local_alloc_copy = local_alloc;
2409                 local_alloc = NULL;
2410         }
2411
2412         /* go through each journal, trylock it and if you get the
2413          * lock, and it's marked as dirty, set the bit in the recover
2414          * map and launch a recovery thread for it. */
2415         status = ocfs2_mark_dead_nodes(osb);
2416         if (status < 0) {
2417                 mlog_errno(status);
2418                 goto finally;
2419         }
2420
2421         status = ocfs2_compute_replay_slots(osb);
2422         if (status < 0)
2423                 mlog_errno(status);
2424
2425 finally:
2426         if (local_alloc)
2427                 kfree(local_alloc);
2428
2429         mlog_exit(status);
2430         return status;
2431 }
2432
2433 /*
2434  * The routine gets called from dismount or close whenever a dismount on
2435  * volume is requested and the osb open count becomes 1.
2436  * It will remove the osb from the global list and also free up all the
2437  * initialized resources and fileobject.
2438  */
2439 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2440 {
2441         mlog_entry_void();
2442
2443         /* This function assumes that the caller has the main osb resource */
2444
2445         ocfs2_free_slot_info(osb);
2446
2447         kfree(osb->osb_orphan_wipes);
2448         kfree(osb->slot_recovery_generations);
2449         /* FIXME
2450          * This belongs in journal shutdown, but because we have to
2451          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2452          * we free it here.
2453          */
2454         kfree(osb->journal);
2455         if (osb->local_alloc_copy)
2456                 kfree(osb->local_alloc_copy);
2457         kfree(osb->uuid_str);
2458         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2459         memset(osb, 0, sizeof(struct ocfs2_super));
2460
2461         mlog_exit_void();
2462 }
2463
2464 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2465  * panic(). We do not support continue-on-error operation. */
2466 static void ocfs2_handle_error(struct super_block *sb)
2467 {
2468         struct ocfs2_super *osb = OCFS2_SB(sb);
2469
2470         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2471                 panic("OCFS2: (device %s): panic forced after error\n",
2472                       sb->s_id);
2473
2474         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2475
2476         if (sb->s_flags & MS_RDONLY &&
2477             (ocfs2_is_soft_readonly(osb) ||
2478              ocfs2_is_hard_readonly(osb)))
2479                 return;
2480
2481         printk(KERN_CRIT "File system is now read-only due to the potential "
2482                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2483                "system is unmounted.\n");
2484         sb->s_flags |= MS_RDONLY;
2485         ocfs2_set_ro_flag(osb, 0);
2486 }
2487
2488 static char error_buf[1024];
2489
2490 void __ocfs2_error(struct super_block *sb,
2491                    const char *function,
2492                    const char *fmt, ...)
2493 {
2494         va_list args;
2495
2496         va_start(args, fmt);
2497         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2498         va_end(args);
2499
2500         /* Not using mlog here because we want to show the actual
2501          * function the error came from. */
2502         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2503                sb->s_id, function, error_buf);
2504
2505         ocfs2_handle_error(sb);
2506 }
2507
2508 /* Handle critical errors. This is intentionally more drastic than
2509  * ocfs2_handle_error, so we only use for things like journal errors,
2510  * etc. */
2511 void __ocfs2_abort(struct super_block* sb,
2512                    const char *function,
2513                    const char *fmt, ...)
2514 {
2515         va_list args;
2516
2517         va_start(args, fmt);
2518         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2519         va_end(args);
2520
2521         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2522                sb->s_id, function, error_buf);
2523
2524         /* We don't have the cluster support yet to go straight to
2525          * hard readonly in here. Until then, we want to keep
2526          * ocfs2_abort() so that we can at least mark critical
2527          * errors.
2528          *
2529          * TODO: This should abort the journal and alert other nodes
2530          * that our slot needs recovery. */
2531
2532         /* Force a panic(). This stinks, but it's better than letting
2533          * things continue without having a proper hard readonly
2534          * here. */
2535         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2536                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2537         ocfs2_handle_error(sb);
2538 }
2539
2540 module_init(ocfs2_init);
2541 module_exit(ocfs2_exit);