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
  73 #include "buffer_head_io.h"
  74
  75 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  76 struct kmem_cache *ocfs2_dquot_cachep;
  77 struct kmem_cache *ocfs2_qf_chunk_cachep;
  78
  79 /* OCFS2 needs to schedule several differnt types of work which
  80  * require cluster locking, disk I/O, recovery waits, etc. Since these
  81  * types of work tend to be heavy we avoid using the kernel events
  82  * workqueue and schedule on our own. */
  83 struct workqueue_struct *ocfs2_wq = NULL;
  84
  85 static struct dentry *ocfs2_debugfs_root = NULL;
  86
  87 MODULE_AUTHOR("Oracle");
  88 MODULE_LICENSE("GPL");
  89
  90 struct mount_options
  91 {
  92         unsigned long   commit_interval;
  93         unsigned long   mount_opt;
  94         unsigned int    atime_quantum;
  95         signed short    slot;
  96         unsigned int    localalloc_opt;
  97         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  98 };
  99
 100 static int ocfs2_parse_options(struct super_block *sb, char *options,
 101                                struct mount_options *mopt,
 102                                int is_remount);
 103 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 104 static void ocfs2_put_super(struct super_block *sb);
 105 static int ocfs2_mount_volume(struct super_block *sb);
 106 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 107 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 108 static int ocfs2_initialize_mem_caches(void);
 109 static void ocfs2_free_mem_caches(void);
 110 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 111
 112 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 113
 114 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 115
 116 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 117 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 118 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 119 static int ocfs2_check_volume(struct ocfs2_super *osb);
 120 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 121                                struct buffer_head *bh,
 122                                u32 sectsize,
 123                                struct ocfs2_blockcheck_stats *stats);
 124 static int ocfs2_initialize_super(struct super_block *sb,
 125                                   struct buffer_head *bh,
 126                                   int sector_size,
 127                                   struct ocfs2_blockcheck_stats *stats);
 128 static int ocfs2_get_sector(struct super_block *sb,
 129                             struct buffer_head **bh,
 130                             int block,
 131                             int sect_size);
 132 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 133 static void ocfs2_destroy_inode(struct inode *inode);
 134 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 135 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 136 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 137
 138 static const struct super_operations ocfs2_sops = {
 139         .statfs         = ocfs2_statfs,
 140         .alloc_inode    = ocfs2_alloc_inode,
 141         .destroy_inode  = ocfs2_destroy_inode,
 142         .drop_inode     = ocfs2_drop_inode,
 143         .clear_inode    = ocfs2_clear_inode,
 144         .delete_inode   = ocfs2_delete_inode,
 145         .sync_fs        = ocfs2_sync_fs,
 146         .put_super      = ocfs2_put_super,
 147         .remount_fs     = ocfs2_remount,
 148         .show_options   = ocfs2_show_options,
 149         .quota_read     = ocfs2_quota_read,
 150         .quota_write    = ocfs2_quota_write,
 151 };
 152
 153 enum {
 154         Opt_barrier,
 155         Opt_err_panic,
 156         Opt_err_ro,
 157         Opt_intr,
 158         Opt_nointr,
 159         Opt_hb_none,
 160         Opt_hb_local,
 161         Opt_data_ordered,
 162         Opt_data_writeback,
 163         Opt_atime_quantum,
 164         Opt_slot,
 165         Opt_commit,
 166         Opt_localalloc,
 167         Opt_localflocks,
 168         Opt_stack,
 169         Opt_user_xattr,
 170         Opt_nouser_xattr,
 171         Opt_inode64,
 172         Opt_acl,
 173         Opt_noacl,
 174         Opt_usrquota,
 175         Opt_grpquota,
 176         Opt_err,
 177 };
 178
 179 static const match_table_t tokens = {
 180         {Opt_barrier, "barrier=%u"},
 181         {Opt_err_panic, "errors=panic"},
 182         {Opt_err_ro, "errors=remount-ro"},
 183         {Opt_intr, "intr"},
 184         {Opt_nointr, "nointr"},
 185         {Opt_hb_none, OCFS2_HB_NONE},
 186         {Opt_hb_local, OCFS2_HB_LOCAL},
 187         {Opt_data_ordered, "data=ordered"},
 188         {Opt_data_writeback, "data=writeback"},
 189         {Opt_atime_quantum, "atime_quantum=%u"},
 190         {Opt_slot, "preferred_slot=%u"},
 191         {Opt_commit, "commit=%u"},
 192         {Opt_localalloc, "localalloc=%d"},
 193         {Opt_localflocks, "localflocks"},
 194         {Opt_stack, "cluster_stack=%s"},
 195         {Opt_user_xattr, "user_xattr"},
 196         {Opt_nouser_xattr, "nouser_xattr"},
 197         {Opt_inode64, "inode64"},
 198         {Opt_acl, "acl"},
 199         {Opt_noacl, "noacl"},
 200         {Opt_usrquota, "usrquota"},
 201         {Opt_grpquota, "grpquota"},
 202         {Opt_err, NULL}
 203 };
 204
 205 #ifdef CONFIG_DEBUG_FS
 206 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 207 {
 208         struct ocfs2_cluster_connection *cconn = osb->cconn;
 209         struct ocfs2_recovery_map *rm = osb->recovery_map;
 210         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 211         int i, out = 0;
 212
 213         out += snprintf(buf + out, len - out,
 214                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 215                         "Device", osb->dev_str, osb->uuid_str,
 216                         osb->fs_generation, osb->vol_label);
 217
 218         out += snprintf(buf + out, len - out,
 219                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 220                         atomic_read(&osb->vol_state), osb->osb_flags);
 221
 222         out += snprintf(buf + out, len - out,
 223                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 224                         osb->sb->s_blocksize, osb->s_clustersize);
 225
 226         out += snprintf(buf + out, len - out,
 227                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 228                         "ROcompat: 0x%X\n",
 229                         "Features", osb->s_feature_compat,
 230                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 231
 232         out += snprintf(buf + out, len - out,
 233                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 234                         osb->s_mount_opt, osb->s_atime_quantum);
 235
 236         if (cconn) {
 237                 out += snprintf(buf + out, len - out,
 238                                 "%10s => Stack: %s  Name: %*s  "
 239                                 "Version: %d.%d\n", "Cluster",
 240                                 (*osb->osb_cluster_stack == '\0' ?
 241                                  "o2cb" : osb->osb_cluster_stack),
 242                                 cconn->cc_namelen, cconn->cc_name,
 243                                 cconn->cc_version.pv_major,
 244                                 cconn->cc_version.pv_minor);
 245         }
 246
 247         spin_lock(&osb->dc_task_lock);
 248         out += snprintf(buf + out, len - out,
 249                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 250                         "WorkSeq: %lu\n", "DownCnvt",
 251                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 252                         osb->blocked_lock_count, osb->dc_wake_sequence,
 253                         osb->dc_work_sequence);
 254         spin_unlock(&osb->dc_task_lock);
 255
 256         spin_lock(&osb->osb_lock);
 257         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 258                         "Recovery",
 259                         (osb->recovery_thread_task ?
 260                          task_pid_nr(osb->recovery_thread_task) : -1));
 261         if (rm->rm_used == 0)
 262                 out += snprintf(buf + out, len - out, " None\n");
 263         else {
 264                 for (i = 0; i < rm->rm_used; i++)
 265                         out += snprintf(buf + out, len - out, " %d",
 266                                         rm->rm_entries[i]);
 267                 out += snprintf(buf + out, len - out, "\n");
 268         }
 269         spin_unlock(&osb->osb_lock);
 270
 271         out += snprintf(buf + out, len - out,
 272                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 273                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 274                         osb->osb_commit_interval,
 275                         atomic_read(&osb->needs_checkpoint));
 276
 277         out += snprintf(buf + out, len - out,
 278                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 279                         "Journal", osb->journal->j_state,
 280                         osb->journal->j_trans_id,
 281                         atomic_read(&osb->journal->j_num_trans));
 282
 283         out += snprintf(buf + out, len - out,
 284                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 285                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 286                         "Stats",
 287                         atomic_read(&osb->alloc_stats.bitmap_data),
 288                         atomic_read(&osb->alloc_stats.local_data),
 289                         atomic_read(&osb->alloc_stats.bg_allocs),
 290                         atomic_read(&osb->alloc_stats.moves),
 291                         atomic_read(&osb->alloc_stats.bg_extends));
 292
 293         out += snprintf(buf + out, len - out,
 294                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 295                         "Default: %u bits\n",
 296                         "LocalAlloc", osb->local_alloc_state,
 297                         (unsigned long long)osb->la_last_gd,
 298                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 299
 300         spin_lock(&osb->osb_lock);
 301         out += snprintf(buf + out, len - out,
 302                         "%10s => Slot: %d  NumStolen: %d\n", "Steal",
 303                         osb->s_inode_steal_slot,
 304                         atomic_read(&osb->s_num_inodes_stolen));
 305         spin_unlock(&osb->osb_lock);
 306
 307         out += snprintf(buf + out, len - out, "OrphanScan => ");
 308         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 309                         os->os_count, os->os_seqno);
 310         out += snprintf(buf + out, len - out, " Last Scan: ");
 311         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 312                 out += snprintf(buf + out, len - out, "Disabled\n");
 313         else
 314                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 315                                 (get_seconds() - os->os_scantime.tv_sec));
 316
 317         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 318                         "Slots", "Num", "RecoGen");
 319         for (i = 0; i < osb->max_slots; ++i) {
 320                 out += snprintf(buf + out, len - out,
 321                                 "%10s  %c %3d  %10d\n",
 322                                 " ",
 323                                 (i == osb->slot_num ? '*' : ' '),
 324                                 i, osb->slot_recovery_generations[i]);
 325         }
 326
 327         return out;
 328 }
 329
 330 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 331 {
 332         struct ocfs2_super *osb = inode->i_private;
 333         char *buf = NULL;
 334
 335         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 336         if (!buf)
 337                 goto bail;
 338
 339         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 340
 341         file->private_data = buf;
 342
 343         return 0;
 344 bail:
 345         return -ENOMEM;
 346 }
 347
 348 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 349 {
 350         kfree(file->private_data);
 351         return 0;
 352 }
 353
 354 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 355                                 size_t nbytes, loff_t *ppos)
 356 {
 357         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 358                                        i_size_read(file->f_mapping->host));
 359 }
 360 #else
 361 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 362 {
 363         return 0;
 364 }
 365 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 366 {
 367         return 0;
 368 }
 369 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 370                                 size_t nbytes, loff_t *ppos)
 371 {
 372         return 0;
 373 }
 374 #endif  /* CONFIG_DEBUG_FS */
 375
 376 static const struct file_operations ocfs2_osb_debug_fops = {
 377         .open =         ocfs2_osb_debug_open,
 378         .release =      ocfs2_debug_release,
 379         .read =         ocfs2_debug_read,
 380         .llseek =       generic_file_llseek,
 381 };
 382
 383 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 384 {
 385         int status;
 386         tid_t target;
 387         struct ocfs2_super *osb = OCFS2_SB(sb);
 388
 389         if (ocfs2_is_hard_readonly(osb))
 390                 return -EROFS;
 391
 392         if (wait) {
 393                 status = ocfs2_flush_truncate_log(osb);
 394                 if (status < 0)
 395                         mlog_errno(status);
 396         } else {
 397                 ocfs2_schedule_truncate_log_flush(osb, 0);
 398         }
 399
 400         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 401                                       &target)) {
 402                 if (wait)
 403                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 404                                              target);
 405         }
 406         return 0;
 407 }
 408
 409 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 410 {
 411         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 412             && (ino == USER_QUOTA_SYSTEM_INODE
 413                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 414                 return 0;
 415         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 416             && (ino == GROUP_QUOTA_SYSTEM_INODE
 417                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 418                 return 0;
 419         return 1;
 420 }
 421
 422 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 423 {
 424         struct inode *new = NULL;
 425         int status = 0;
 426         int i;
 427
 428         mlog_entry_void();
 429
 430         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 431         if (IS_ERR(new)) {
 432                 status = PTR_ERR(new);
 433                 mlog_errno(status);
 434                 goto bail;
 435         }
 436         osb->root_inode = new;
 437
 438         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 439         if (IS_ERR(new)) {
 440                 status = PTR_ERR(new);
 441                 mlog_errno(status);
 442                 goto bail;
 443         }
 444         osb->sys_root_inode = new;
 445
 446         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 447              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 448                 if (!ocfs2_need_system_inode(osb, i))
 449                         continue;
 450                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 451                 if (!new) {
 452                         ocfs2_release_system_inodes(osb);
 453                         status = -EINVAL;
 454                         mlog_errno(status);
 455                         /* FIXME: Should ERROR_RO_FS */
 456                         mlog(ML_ERROR, "Unable to load system inode %d, "
 457                              "possibly corrupt fs?", i);
 458                         goto bail;
 459                 }
 460                 // the array now has one ref, so drop this one
 461                 iput(new);
 462         }
 463
 464 bail:
 465         mlog_exit(status);
 466         return status;
 467 }
 468
 469 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 470 {
 471         struct inode *new = NULL;
 472         int status = 0;
 473         int i;
 474
 475         mlog_entry_void();
 476
 477         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 478              i < NUM_SYSTEM_INODES;
 479              i++) {
 480                 if (!ocfs2_need_system_inode(osb, i))
 481                         continue;
 482                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 483                 if (!new) {
 484                         ocfs2_release_system_inodes(osb);
 485                         status = -EINVAL;
 486                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 487                              status, i, osb->slot_num);
 488                         goto bail;
 489                 }
 490                 /* the array now has one ref, so drop this one */
 491                 iput(new);
 492         }
 493
 494 bail:
 495         mlog_exit(status);
 496         return status;
 497 }
 498
 499 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 500 {
 501         int i;
 502         struct inode *inode;
 503
 504         mlog_entry_void();
 505
 506         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 507                 inode = osb->system_inodes[i];
 508                 if (inode) {
 509                         iput(inode);
 510                         osb->system_inodes[i] = NULL;
 511                 }
 512         }
 513
 514         inode = osb->sys_root_inode;
 515         if (inode) {
 516                 iput(inode);
 517                 osb->sys_root_inode = NULL;
 518         }
 519
 520         inode = osb->root_inode;
 521         if (inode) {
 522                 iput(inode);
 523                 osb->root_inode = NULL;
 524         }
 525
 526         mlog_exit(0);
 527 }
 528
 529 /* We're allocating fs objects, use GFP_NOFS */
 530 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 531 {
 532         struct ocfs2_inode_info *oi;
 533
 534         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 535         if (!oi)
 536                 return NULL;
 537
 538         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 539         return &oi->vfs_inode;
 540 }
 541
 542 static void ocfs2_destroy_inode(struct inode *inode)
 543 {
 544         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 545 }
 546
 547 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 548                                                 unsigned int cbits)
 549 {
 550         unsigned int bytes = 1 << cbits;
 551         unsigned int trim = bytes;
 552         unsigned int bitshift = 32;
 553
 554         /*
 555          * i_size and all block offsets in ocfs2 are always 64 bits
 556          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 557          * 64 bit platforms, cluster size will be the limiting factor.
 558          */
 559
 560 #if BITS_PER_LONG == 32
 561 # if defined(CONFIG_LBDAF)
 562         BUILD_BUG_ON(sizeof(sector_t) != 8);
 563         /*
 564          * We might be limited by page cache size.
 565          */
 566         if (bytes > PAGE_CACHE_SIZE) {
 567                 bytes = PAGE_CACHE_SIZE;
 568                 trim = 1;
 569                 /*
 570                  * Shift by 31 here so that we don't get larger than
 571                  * MAX_LFS_FILESIZE
 572                  */
 573                 bitshift = 31;
 574         }
 575 # else
 576         /*
 577          * We are limited by the size of sector_t. Use block size, as
 578          * that's what we expose to the VFS.
 579          */
 580         bytes = 1 << bbits;
 581         trim = 1;
 582         bitshift = 31;
 583 # endif
 584 #endif
 585
 586         /*
 587          * Trim by a whole cluster when we can actually approach the
 588          * on-disk limits. Otherwise we can overflow i_clusters when
 589          * an extent start is at the max offset.
 590          */
 591         return (((unsigned long long)bytes) << bitshift) - trim;
 592 }
 593
 594 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 595 {
 596         int incompat_features;
 597         int ret = 0;
 598         struct mount_options parsed_options;
 599         struct ocfs2_super *osb = OCFS2_SB(sb);
 600
 601         lock_kernel();
 602
 603         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 604                 ret = -EINVAL;
 605                 goto out;
 606         }
 607
 608         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 609             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 610                 ret = -EINVAL;
 611                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 612                 goto out;
 613         }
 614
 615         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 616             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 617                 ret = -EINVAL;
 618                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 619                 goto out;
 620         }
 621
 622         /* Probably don't want this on remount; it might
 623          * mess with other nodes */
 624         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 625             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 626                 ret = -EINVAL;
 627                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 628                 goto out;
 629         }
 630
 631         /* We're going to/from readonly mode. */
 632         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 633                 /* Disable quota accounting before remounting RO */
 634                 if (*flags & MS_RDONLY) {
 635                         ret = ocfs2_susp_quotas(osb, 0);
 636                         if (ret < 0)
 637                                 goto out;
 638                 }
 639                 /* Lock here so the check of HARD_RO and the potential
 640                  * setting of SOFT_RO is atomic. */
 641                 spin_lock(&osb->osb_lock);
 642                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 643                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 644                         ret = -EROFS;
 645                         goto unlock_osb;
 646                 }
 647
 648                 if (*flags & MS_RDONLY) {
 649                         mlog(0, "Going to ro mode.\n");
 650                         sb->s_flags |= MS_RDONLY;
 651                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 652                 } else {
 653                         mlog(0, "Making ro filesystem writeable.\n");
 654
 655                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 656                                 mlog(ML_ERROR, "Cannot remount RDWR "
 657                                      "filesystem due to previous errors.\n");
 658                                 ret = -EROFS;
 659                                 goto unlock_osb;
 660                         }
 661                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 662                         if (incompat_features) {
 663                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 664                                      "of unsupported optional features "
 665                                      "(%x).\n", incompat_features);
 666                                 ret = -EINVAL;
 667                                 goto unlock_osb;
 668                         }
 669                         sb->s_flags &= ~MS_RDONLY;
 670                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 671                 }
 672 unlock_osb:
 673                 spin_unlock(&osb->osb_lock);
 674                 /* Enable quota accounting after remounting RW */
 675                 if (!ret && !(*flags & MS_RDONLY)) {
 676                         if (sb_any_quota_suspended(sb))
 677                                 ret = ocfs2_susp_quotas(osb, 1);
 678                         else
 679                                 ret = ocfs2_enable_quotas(osb);
 680                         if (ret < 0) {
 681                                 /* Return back changes... */
 682                                 spin_lock(&osb->osb_lock);
 683                                 sb->s_flags |= MS_RDONLY;
 684                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 685                                 spin_unlock(&osb->osb_lock);
 686                                 goto out;
 687                         }
 688                 }
 689         }
 690
 691         if (!ret) {
 692                 /* Only save off the new mount options in case of a successful
 693                  * remount. */
 694                 if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 695                         parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 696                 osb->s_mount_opt = parsed_options.mount_opt;
 697                 osb->s_atime_quantum = parsed_options.atime_quantum;
 698                 osb->preferred_slot = parsed_options.slot;
 699                 if (parsed_options.commit_interval)
 700                         osb->osb_commit_interval = parsed_options.commit_interval;
 701
 702                 if (!ocfs2_is_hard_readonly(osb))
 703                         ocfs2_set_journal_params(osb);
 704         }
 705 out:
 706         unlock_kernel();
 707         return ret;
 708 }
 709
 710 static int ocfs2_sb_probe(struct super_block *sb,
 711                           struct buffer_head **bh,
 712                           int *sector_size,
 713                           struct ocfs2_blockcheck_stats *stats)
 714 {
 715         int status, tmpstat;
 716         struct ocfs1_vol_disk_hdr *hdr;
 717         struct ocfs2_dinode *di;
 718         int blksize;
 719
 720         *bh = NULL;
 721
 722         /* may be > 512 */
 723         *sector_size = bdev_logical_block_size(sb->s_bdev);
 724         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 725                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 726                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 727                 status = -EINVAL;
 728                 goto bail;
 729         }
 730
 731         /* Can this really happen? */
 732         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 733                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 734
 735         /* check block zero for old format */
 736         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 737         if (status < 0) {
 738                 mlog_errno(status);
 739                 goto bail;
 740         }
 741         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 742         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 743                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 744                      hdr->major_version, hdr->minor_version);
 745                 status = -EINVAL;
 746         }
 747         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 748                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 749                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 750                      hdr->signature);
 751                 status = -EINVAL;
 752         }
 753         brelse(*bh);
 754         *bh = NULL;
 755         if (status < 0) {
 756                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 757                      "upgraded before mounting with ocfs v2\n");
 758                 goto bail;
 759         }
 760
 761         /*
 762          * Now check at magic offset for 512, 1024, 2048, 4096
 763          * blocksizes.  4096 is the maximum blocksize because it is
 764          * the minimum clustersize.
 765          */
 766         status = -EINVAL;
 767         for (blksize = *sector_size;
 768              blksize <= OCFS2_MAX_BLOCKSIZE;
 769              blksize <<= 1) {
 770                 tmpstat = ocfs2_get_sector(sb, bh,
 771                                            OCFS2_SUPER_BLOCK_BLKNO,
 772                                            blksize);
 773                 if (tmpstat < 0) {
 774                         status = tmpstat;
 775                         mlog_errno(status);
 776                         break;
 777                 }
 778                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 779                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 780                 spin_lock_init(&stats->b_lock);
 781                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 782                 if (tmpstat < 0) {
 783                         brelse(*bh);
 784                         *bh = NULL;
 785                 }
 786                 if (tmpstat != -EAGAIN) {
 787                         status = tmpstat;
 788                         break;
 789                 }
 790         }
 791
 792 bail:
 793         return status;
 794 }
 795
 796 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 797 {
 798         if (ocfs2_mount_local(osb)) {
 799                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 800                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 801                              "mounted device.\n");
 802                         return -EINVAL;
 803                 }
 804         }
 805
 806         if (ocfs2_userspace_stack(osb)) {
 807                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 808                         mlog(ML_ERROR, "Userspace stack expected, but "
 809                              "o2cb heartbeat arguments passed to mount\n");
 810                         return -EINVAL;
 811                 }
 812         }
 813
 814         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 815                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 816                     !ocfs2_userspace_stack(osb)) {
 817                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 818                              "a read-write clustered device.\n");
 819                         return -EINVAL;
 820                 }
 821         }
 822
 823         return 0;
 824 }
 825
 826 /*
 827  * If we're using a userspace stack, mount should have passed
 828  * a name that matches the disk.  If not, mount should not
 829  * have passed a stack.
 830  */
 831 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 832                                         struct mount_options *mopt)
 833 {
 834         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 835                 mlog(ML_ERROR,
 836                      "cluster stack passed to mount, but this filesystem "
 837                      "does not support it\n");
 838                 return -EINVAL;
 839         }
 840
 841         if (ocfs2_userspace_stack(osb) &&
 842             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 843                     OCFS2_STACK_LABEL_LEN)) {
 844                 mlog(ML_ERROR,
 845                      "cluster stack passed to mount (\"%s\") does not "
 846                      "match the filesystem (\"%s\")\n",
 847                      mopt->cluster_stack,
 848                      osb->osb_cluster_stack);
 849                 return -EINVAL;
 850         }
 851
 852         return 0;
 853 }
 854
 855 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 856 {
 857         int type;
 858         struct super_block *sb = osb->sb;
 859         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 860                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 861         int status = 0;
 862
 863         for (type = 0; type < MAXQUOTAS; type++) {
 864                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 865                         continue;
 866                 if (unsuspend)
 867                         status = vfs_quota_enable(
 868                                         sb_dqopt(sb)->files[type],
 869                                         type, QFMT_OCFS2,
 870                                         DQUOT_SUSPENDED);
 871                 else
 872                         status = vfs_quota_disable(sb, type,
 873                                                    DQUOT_SUSPENDED);
 874                 if (status < 0)
 875                         break;
 876         }
 877         if (status < 0)
 878                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 879                      "remount (error = %d).\n", status);
 880         return status;
 881 }
 882
 883 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 884 {
 885         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 886         struct super_block *sb = osb->sb;
 887         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 888                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 889         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 890                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 891         int status;
 892         int type;
 893
 894         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 895         for (type = 0; type < MAXQUOTAS; type++) {
 896                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 897                         continue;
 898                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 899                                                         osb->slot_num);
 900                 if (!inode[type]) {
 901                         status = -ENOENT;
 902                         goto out_quota_off;
 903                 }
 904                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 905                                                 DQUOT_USAGE_ENABLED);
 906                 if (status < 0)
 907                         goto out_quota_off;
 908         }
 909
 910         for (type = 0; type < MAXQUOTAS; type++)
 911                 iput(inode[type]);
 912         return 0;
 913 out_quota_off:
 914         ocfs2_disable_quotas(osb);
 915         for (type = 0; type < MAXQUOTAS; type++)
 916                 iput(inode[type]);
 917         mlog_errno(status);
 918         return status;
 919 }
 920
 921 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 922 {
 923         int type;
 924         struct inode *inode;
 925         struct super_block *sb = osb->sb;
 926
 927         /* We mostly ignore errors in this function because there's not much
 928          * we can do when we see them */
 929         for (type = 0; type < MAXQUOTAS; type++) {
 930                 if (!sb_has_quota_loaded(sb, type))
 931                         continue;
 932                 inode = igrab(sb->s_dquot.files[type]);
 933                 /* Turn off quotas. This will remove all dquot structures from
 934                  * memory and so they will be automatically synced to global
 935                  * quota files */
 936                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 937                                             DQUOT_LIMITS_ENABLED);
 938                 if (!inode)
 939                         continue;
 940                 iput(inode);
 941         }
 942 }
 943
 944 /* Handle quota on quotactl */
 945 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 946                           char *path, int remount)
 947 {
 948         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 949                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 950
 951         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 952                 return -EINVAL;
 953
 954         if (remount)
 955                 return 0;       /* Just ignore it has been handled in
 956                                  * ocfs2_remount() */
 957         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 958                                     format_id, DQUOT_LIMITS_ENABLED);
 959 }
 960
 961 /* Handle quota off quotactl */
 962 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 963 {
 964         if (remount)
 965                 return 0;       /* Ignore now and handle later in
 966                                  * ocfs2_remount() */
 967         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 968 }
 969
 970 static const struct quotactl_ops ocfs2_quotactl_ops = {
 971         .quota_on       = ocfs2_quota_on,
 972         .quota_off      = ocfs2_quota_off,
 973         .quota_sync     = vfs_quota_sync,
 974         .get_info       = vfs_get_dqinfo,
 975         .set_info       = vfs_set_dqinfo,
 976         .get_dqblk      = vfs_get_dqblk,
 977         .set_dqblk      = vfs_set_dqblk,
 978 };
 979
 980 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 981 {
 982         struct dentry *root;
 983         int status, sector_size;
 984         struct mount_options parsed_options;
 985         struct inode *inode = NULL;
 986         struct ocfs2_super *osb = NULL;
 987         struct buffer_head *bh = NULL;
 988         char nodestr[8];
 989         struct ocfs2_blockcheck_stats stats;
 990
 991         mlog_entry("%p, %p, %i", sb, data, silent);
 992
 993         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 994                 status = -EINVAL;
 995                 goto read_super_error;
 996         }
 997
 998         /* probe for superblock */
 999         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1000         if (status < 0) {
1001                 mlog(ML_ERROR, "superblock probe failed!\n");
1002                 goto read_super_error;
1003         }
1004
1005         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1006         osb = OCFS2_SB(sb);
1007         if (status < 0) {
1008                 mlog_errno(status);
1009                 goto read_super_error;
1010         }
1011         brelse(bh);
1012         bh = NULL;
1013
1014         if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
1015                 parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1016
1017         osb->s_mount_opt = parsed_options.mount_opt;
1018         osb->s_atime_quantum = parsed_options.atime_quantum;
1019         osb->preferred_slot = parsed_options.slot;
1020         osb->osb_commit_interval = parsed_options.commit_interval;
1021         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1022         osb->local_alloc_bits = osb->local_alloc_default_bits;
1023         if (osb->s_mount_opt & OCFS2_MOUNT_USRQUOTA &&
1024             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1025                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1026                 status = -EINVAL;
1027                 mlog(ML_ERROR, "User quotas were requested, but this "
1028                      "filesystem does not have the feature enabled.\n");
1029                 goto read_super_error;
1030         }
1031         if (osb->s_mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1032             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1033                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1034                 status = -EINVAL;
1035                 mlog(ML_ERROR, "Group quotas were requested, but this "
1036                      "filesystem does not have the feature enabled.\n");
1037                 goto read_super_error;
1038         }
1039
1040         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1041         if (status)
1042                 goto read_super_error;
1043
1044         sb->s_magic = OCFS2_SUPER_MAGIC;
1045
1046         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1047                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1048
1049         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1050          * heartbeat=none */
1051         if (bdev_read_only(sb->s_bdev)) {
1052                 if (!(sb->s_flags & MS_RDONLY)) {
1053                         status = -EACCES;
1054                         mlog(ML_ERROR, "Readonly device detected but readonly "
1055                              "mount was not specified.\n");
1056                         goto read_super_error;
1057                 }
1058
1059                 /* You should not be able to start a local heartbeat
1060                  * on a readonly device. */
1061                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1062                         status = -EROFS;
1063                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1064                              "device.\n");
1065                         goto read_super_error;
1066                 }
1067
1068                 status = ocfs2_check_journals_nolocks(osb);
1069                 if (status < 0) {
1070                         if (status == -EROFS)
1071                                 mlog(ML_ERROR, "Recovery required on readonly "
1072                                      "file system, but write access is "
1073                                      "unavailable.\n");
1074                         else
1075                                 mlog_errno(status);
1076                         goto read_super_error;
1077                 }
1078
1079                 ocfs2_set_ro_flag(osb, 1);
1080
1081                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1082                        "services will be utilized for this mount. Recovery "
1083                        "will be skipped.\n");
1084         }
1085
1086         if (!ocfs2_is_hard_readonly(osb)) {
1087                 if (sb->s_flags & MS_RDONLY)
1088                         ocfs2_set_ro_flag(osb, 0);
1089         }
1090
1091         status = ocfs2_verify_heartbeat(osb);
1092         if (status < 0) {
1093                 mlog_errno(status);
1094                 goto read_super_error;
1095         }
1096
1097         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1098                                                  ocfs2_debugfs_root);
1099         if (!osb->osb_debug_root) {
1100                 status = -EINVAL;
1101                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1102                 goto read_super_error;
1103         }
1104
1105         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1106                                             osb->osb_debug_root,
1107                                             osb,
1108                                             &ocfs2_osb_debug_fops);
1109         if (!osb->osb_ctxt) {
1110                 status = -EINVAL;
1111                 mlog_errno(status);
1112                 goto read_super_error;
1113         }
1114
1115         if (ocfs2_meta_ecc(osb)) {
1116                 status = ocfs2_blockcheck_stats_debugfs_install(
1117                                                 &osb->osb_ecc_stats,
1118                                                 osb->osb_debug_root);
1119                 if (status) {
1120                         mlog(ML_ERROR,
1121                              "Unable to create blockcheck statistics "
1122                              "files\n");
1123                         goto read_super_error;
1124                 }
1125         }
1126
1127         status = ocfs2_mount_volume(sb);
1128         if (osb->root_inode)
1129                 inode = igrab(osb->root_inode);
1130
1131         if (status < 0)
1132                 goto read_super_error;
1133
1134         if (!inode) {
1135                 status = -EIO;
1136                 mlog_errno(status);
1137                 goto read_super_error;
1138         }
1139
1140         root = d_alloc_root(inode);
1141         if (!root) {
1142                 status = -ENOMEM;
1143                 mlog_errno(status);
1144                 goto read_super_error;
1145         }
1146
1147         sb->s_root = root;
1148
1149         ocfs2_complete_mount_recovery(osb);
1150
1151         if (ocfs2_mount_local(osb))
1152                 snprintf(nodestr, sizeof(nodestr), "local");
1153         else
1154                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1155
1156         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1157                "with %s data mode.\n",
1158                osb->dev_str, nodestr, osb->slot_num,
1159                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1160                "ordered");
1161
1162         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1163         wake_up(&osb->osb_mount_event);
1164
1165         /* Now we can initialize quotas because we can afford to wait
1166          * for cluster locks recovery now. That also means that truncation
1167          * log recovery can happen but that waits for proper quota setup */
1168         if (!(sb->s_flags & MS_RDONLY)) {
1169                 status = ocfs2_enable_quotas(osb);
1170                 if (status < 0) {
1171                         /* We have to err-out specially here because
1172                          * s_root is already set */
1173                         mlog_errno(status);
1174                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1175                         wake_up(&osb->osb_mount_event);
1176                         mlog_exit(status);
1177                         return status;
1178                 }
1179         }
1180
1181         ocfs2_complete_quota_recovery(osb);
1182
1183         /* Now we wake up again for processes waiting for quotas */
1184         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1185         wake_up(&osb->osb_mount_event);
1186
1187         /* Start this when the mount is almost sure of being successful */
1188         ocfs2_orphan_scan_start(osb);
1189
1190         mlog_exit(status);
1191         return status;
1192
1193 read_super_error:
1194         brelse(bh);
1195
1196         if (inode)
1197                 iput(inode);
1198
1199         if (osb) {
1200                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1201                 wake_up(&osb->osb_mount_event);
1202                 ocfs2_dismount_volume(sb, 1);
1203         }
1204
1205         mlog_exit(status);
1206         return status;
1207 }
1208
1209 static int ocfs2_get_sb(struct file_system_type *fs_type,
1210                         int flags,
1211                         const char *dev_name,
1212                         void *data,
1213                         struct vfsmount *mnt)
1214 {
1215         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1216                            mnt);
1217 }
1218
1219 static void ocfs2_kill_sb(struct super_block *sb)
1220 {
1221         struct ocfs2_super *osb = OCFS2_SB(sb);
1222
1223         /* Failed mount? */
1224         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1225                 goto out;
1226
1227         /* Prevent further queueing of inode drop events */
1228         spin_lock(&dentry_list_lock);
1229         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1230         spin_unlock(&dentry_list_lock);
1231         /* Wait for work to finish and/or remove it */
1232         cancel_work_sync(&osb->dentry_lock_work);
1233 out:
1234         kill_block_super(sb);
1235 }
1236
1237 static struct file_system_type ocfs2_fs_type = {
1238         .owner          = THIS_MODULE,
1239         .name           = "ocfs2",
1240         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1241                                         * the fs? */
1242         .kill_sb        = ocfs2_kill_sb,
1243
1244         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1245         .next           = NULL
1246 };
1247
1248 static int ocfs2_parse_options(struct super_block *sb,
1249                                char *options,
1250                                struct mount_options *mopt,
1251                                int is_remount)
1252 {
1253         int status;
1254         char *p;
1255
1256         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1257                    options ? options : "(none)");
1258
1259         mopt->commit_interval = 0;
1260         mopt->mount_opt = 0;
1261         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1262         mopt->slot = OCFS2_INVALID_SLOT;
1263         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1264         mopt->cluster_stack[0] = '\0';
1265
1266         if (!options) {
1267                 status = 1;
1268                 goto bail;
1269         }
1270
1271         while ((p = strsep(&options, ",")) != NULL) {
1272                 int token, option;
1273                 substring_t args[MAX_OPT_ARGS];
1274
1275                 if (!*p)
1276                         continue;
1277
1278                 token = match_token(p, tokens, args);
1279                 switch (token) {
1280                 case Opt_hb_local:
1281                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1282                         break;
1283                 case Opt_hb_none:
1284                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1285                         break;
1286                 case Opt_barrier:
1287                         if (match_int(&args[0], &option)) {
1288                                 status = 0;
1289                                 goto bail;
1290                         }
1291                         if (option)
1292                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1293                         else
1294                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1295                         break;
1296                 case Opt_intr:
1297                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1298                         break;
1299                 case Opt_nointr:
1300                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1301                         break;
1302                 case Opt_err_panic:
1303                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1304                         break;
1305                 case Opt_err_ro:
1306                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1307                         break;
1308                 case Opt_data_ordered:
1309                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1310                         break;
1311                 case Opt_data_writeback:
1312                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1313                         break;
1314                 case Opt_user_xattr:
1315                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1316                         break;
1317                 case Opt_nouser_xattr:
1318                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1319                         break;
1320                 case Opt_atime_quantum:
1321                         if (match_int(&args[0], &option)) {
1322                                 status = 0;
1323                                 goto bail;
1324                         }
1325                         if (option >= 0)
1326                                 mopt->atime_quantum = option;
1327                         break;
1328                 case Opt_slot:
1329                         option = 0;
1330                         if (match_int(&args[0], &option)) {
1331                                 status = 0;
1332                                 goto bail;
1333                         }
1334                         if (option)
1335                                 mopt->slot = (s16)option;
1336                         break;
1337                 case Opt_commit:
1338                         option = 0;
1339                         if (match_int(&args[0], &option)) {
1340                                 status = 0;
1341                                 goto bail;
1342                         }
1343                         if (option < 0)
1344                                 return 0;
1345                         if (option == 0)
1346                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1347                         mopt->commit_interval = HZ * option;
1348                         break;
1349                 case Opt_localalloc:
1350                         option = 0;
1351                         if (match_int(&args[0], &option)) {
1352                                 status = 0;
1353                                 goto bail;
1354                         }
1355                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1356                                 mopt->localalloc_opt = option;
1357                         break;
1358                 case Opt_localflocks:
1359                         /*
1360                          * Changing this during remount could race
1361                          * flock() requests, or "unbalance" existing
1362                          * ones (e.g., a lock is taken in one mode but
1363                          * dropped in the other). If users care enough
1364                          * to flip locking modes during remount, we
1365                          * could add a "local" flag to individual
1366                          * flock structures for proper tracking of
1367                          * state.
1368                          */
1369                         if (!is_remount)
1370                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1371                         break;
1372                 case Opt_stack:
1373                         /* Check both that the option we were passed
1374                          * is of the right length and that it is a proper
1375                          * string of the right length.
1376                          */
1377                         if (((args[0].to - args[0].from) !=
1378                              OCFS2_STACK_LABEL_LEN) ||
1379                             (strnlen(args[0].from,
1380                                      OCFS2_STACK_LABEL_LEN) !=
1381                              OCFS2_STACK_LABEL_LEN)) {
1382                                 mlog(ML_ERROR,
1383                                      "Invalid cluster_stack option\n");
1384                                 status = 0;
1385                                 goto bail;
1386                         }
1387                         memcpy(mopt->cluster_stack, args[0].from,
1388                                OCFS2_STACK_LABEL_LEN);
1389                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1390                         break;
1391                 case Opt_inode64:
1392                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1393                         break;
1394                 case Opt_usrquota:
1395                         /* We check only on remount, otherwise features
1396                          * aren't yet initialized. */
1397                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1398                             OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1399                                 mlog(ML_ERROR, "User quota requested but "
1400                                      "filesystem feature is not set\n");
1401                                 status = 0;
1402                                 goto bail;
1403                         }
1404                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1405                         break;
1406                 case Opt_grpquota:
1407                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1408                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1409                                 mlog(ML_ERROR, "Group quota requested but "
1410                                      "filesystem feature is not set\n");
1411                                 status = 0;
1412                                 goto bail;
1413                         }
1414                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1415                         break;
1416 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1417                 case Opt_acl:
1418                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1419                         break;
1420                 case Opt_noacl:
1421                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1422                         break;
1423 #else
1424                 case Opt_acl:
1425                 case Opt_noacl:
1426                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
1427                         break;
1428 #endif
1429                 default:
1430                         mlog(ML_ERROR,
1431                              "Unrecognized mount option \"%s\" "
1432                              "or missing value\n", p);
1433                         status = 0;
1434                         goto bail;
1435                 }
1436         }
1437
1438         status = 1;
1439
1440 bail:
1441         mlog_exit(status);
1442         return status;
1443 }
1444
1445 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1446 {
1447         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1448         unsigned long opts = osb->s_mount_opt;
1449         unsigned int local_alloc_megs;
1450
1451         if (opts & OCFS2_MOUNT_HB_LOCAL)
1452                 seq_printf(s, ",_netdev,heartbeat=local");
1453         else
1454                 seq_printf(s, ",heartbeat=none");
1455
1456         if (opts & OCFS2_MOUNT_NOINTR)
1457                 seq_printf(s, ",nointr");
1458
1459         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1460                 seq_printf(s, ",data=writeback");
1461         else
1462                 seq_printf(s, ",data=ordered");
1463
1464         if (opts & OCFS2_MOUNT_BARRIER)
1465                 seq_printf(s, ",barrier=1");
1466
1467         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1468                 seq_printf(s, ",errors=panic");
1469         else
1470                 seq_printf(s, ",errors=remount-ro");
1471
1472         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1473                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1474
1475         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1476                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1477
1478         if (osb->osb_commit_interval)
1479                 seq_printf(s, ",commit=%u",
1480                            (unsigned) (osb->osb_commit_interval / HZ));
1481
1482         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1483         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1484                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1485
1486         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1487                 seq_printf(s, ",localflocks,");
1488
1489         if (osb->osb_cluster_stack[0])
1490                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1491                            osb->osb_cluster_stack);
1492         if (opts & OCFS2_MOUNT_USRQUOTA)
1493                 seq_printf(s, ",usrquota");
1494         if (opts & OCFS2_MOUNT_GRPQUOTA)
1495                 seq_printf(s, ",grpquota");
1496
1497         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1498                 seq_printf(s, ",nouser_xattr");
1499         else
1500                 seq_printf(s, ",user_xattr");
1501
1502         if (opts & OCFS2_MOUNT_INODE64)
1503                 seq_printf(s, ",inode64");
1504
1505 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1506         if (opts & OCFS2_MOUNT_POSIX_ACL)
1507                 seq_printf(s, ",acl");
1508         else
1509                 seq_printf(s, ",noacl");
1510 #endif
1511
1512         return 0;
1513 }
1514
1515 static int __init ocfs2_init(void)
1516 {
1517         int status;
1518
1519         mlog_entry_void();
1520
1521         ocfs2_print_version();
1522
1523         status = init_ocfs2_uptodate_cache();
1524         if (status < 0) {
1525                 mlog_errno(status);
1526                 goto leave;
1527         }
1528
1529         status = ocfs2_initialize_mem_caches();
1530         if (status < 0) {
1531                 mlog_errno(status);
1532                 goto leave;
1533         }
1534
1535         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1536         if (!ocfs2_wq) {
1537                 status = -ENOMEM;
1538                 goto leave;
1539         }
1540
1541         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1542         if (!ocfs2_debugfs_root) {
1543                 status = -EFAULT;
1544                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1545         }
1546
1547         status = ocfs2_quota_setup();
1548         if (status)
1549                 goto leave;
1550
1551         ocfs2_set_locking_protocol();
1552
1553         status = register_quota_format(&ocfs2_quota_format);
1554 leave:
1555         if (status < 0) {
1556                 ocfs2_quota_shutdown();
1557                 ocfs2_free_mem_caches();
1558                 exit_ocfs2_uptodate_cache();
1559         }
1560
1561         mlog_exit(status);
1562
1563         if (status >= 0) {
1564                 return register_filesystem(&ocfs2_fs_type);
1565         } else
1566                 return -1;
1567 }
1568
1569 static void __exit ocfs2_exit(void)
1570 {
1571         mlog_entry_void();
1572
1573         ocfs2_quota_shutdown();
1574
1575         if (ocfs2_wq) {
1576                 flush_workqueue(ocfs2_wq);
1577                 destroy_workqueue(ocfs2_wq);
1578         }
1579
1580         unregister_quota_format(&ocfs2_quota_format);
1581
1582         debugfs_remove(ocfs2_debugfs_root);
1583
1584         ocfs2_free_mem_caches();
1585
1586         unregister_filesystem(&ocfs2_fs_type);
1587
1588         exit_ocfs2_uptodate_cache();
1589
1590         mlog_exit_void();
1591 }
1592
1593 static void ocfs2_put_super(struct super_block *sb)
1594 {
1595         mlog_entry("(0x%p)\n", sb);
1596
1597         lock_kernel();
1598
1599         ocfs2_sync_blockdev(sb);
1600         ocfs2_dismount_volume(sb, 0);
1601
1602         unlock_kernel();
1603
1604         mlog_exit_void();
1605 }
1606
1607 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1608 {
1609         struct ocfs2_super *osb;
1610         u32 numbits, freebits;
1611         int status;
1612         struct ocfs2_dinode *bm_lock;
1613         struct buffer_head *bh = NULL;
1614         struct inode *inode = NULL;
1615
1616         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1617
1618         osb = OCFS2_SB(dentry->d_sb);
1619
1620         inode = ocfs2_get_system_file_inode(osb,
1621                                             GLOBAL_BITMAP_SYSTEM_INODE,
1622                                             OCFS2_INVALID_SLOT);
1623         if (!inode) {
1624                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1625                 status = -EIO;
1626                 goto bail;
1627         }
1628
1629         status = ocfs2_inode_lock(inode, &bh, 0);
1630         if (status < 0) {
1631                 mlog_errno(status);
1632                 goto bail;
1633         }
1634
1635         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1636
1637         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1638         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1639
1640         buf->f_type = OCFS2_SUPER_MAGIC;
1641         buf->f_bsize = dentry->d_sb->s_blocksize;
1642         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1643         buf->f_blocks = ((sector_t) numbits) *
1644                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1645         buf->f_bfree = ((sector_t) freebits) *
1646                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1647         buf->f_bavail = buf->f_bfree;
1648         buf->f_files = numbits;
1649         buf->f_ffree = freebits;
1650         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1651                                 & 0xFFFFFFFFUL;
1652         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1653                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1654
1655         brelse(bh);
1656
1657         ocfs2_inode_unlock(inode, 0);
1658         status = 0;
1659 bail:
1660         if (inode)
1661                 iput(inode);
1662
1663         mlog_exit(status);
1664
1665         return status;
1666 }
1667
1668 static void ocfs2_inode_init_once(void *data)
1669 {
1670         struct ocfs2_inode_info *oi = data;
1671
1672         oi->ip_flags = 0;
1673         oi->ip_open_count = 0;
1674         spin_lock_init(&oi->ip_lock);
1675         ocfs2_extent_map_init(&oi->vfs_inode);
1676         INIT_LIST_HEAD(&oi->ip_io_markers);
1677         oi->ip_dir_start_lookup = 0;
1678
1679         init_rwsem(&oi->ip_alloc_sem);
1680         init_rwsem(&oi->ip_xattr_sem);
1681         mutex_init(&oi->ip_io_mutex);
1682
1683         oi->ip_blkno = 0ULL;
1684         oi->ip_clusters = 0;
1685
1686         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1687         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1688         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1689
1690         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1691                                   &ocfs2_inode_caching_ops);
1692
1693         inode_init_once(&oi->vfs_inode);
1694 }
1695
1696 static int ocfs2_initialize_mem_caches(void)
1697 {
1698         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1699                                        sizeof(struct ocfs2_inode_info),
1700                                        0,
1701                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1702                                                 SLAB_MEM_SPREAD),
1703                                        ocfs2_inode_init_once);
1704         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1705                                         sizeof(struct ocfs2_dquot),
1706                                         0,
1707                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1708                                                 SLAB_MEM_SPREAD),
1709                                         NULL);
1710         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1711                                         sizeof(struct ocfs2_quota_chunk),
1712                                         0,
1713                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1714                                         NULL);
1715         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1716             !ocfs2_qf_chunk_cachep) {
1717                 if (ocfs2_inode_cachep)
1718                         kmem_cache_destroy(ocfs2_inode_cachep);
1719                 if (ocfs2_dquot_cachep)
1720                         kmem_cache_destroy(ocfs2_dquot_cachep);
1721                 if (ocfs2_qf_chunk_cachep)
1722                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1723                 return -ENOMEM;
1724         }
1725
1726         return 0;
1727 }
1728
1729 static void ocfs2_free_mem_caches(void)
1730 {
1731         if (ocfs2_inode_cachep)
1732                 kmem_cache_destroy(ocfs2_inode_cachep);
1733         ocfs2_inode_cachep = NULL;
1734
1735         if (ocfs2_dquot_cachep)
1736                 kmem_cache_destroy(ocfs2_dquot_cachep);
1737         ocfs2_dquot_cachep = NULL;
1738
1739         if (ocfs2_qf_chunk_cachep)
1740                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1741         ocfs2_qf_chunk_cachep = NULL;
1742 }
1743
1744 static int ocfs2_get_sector(struct super_block *sb,
1745                             struct buffer_head **bh,
1746                             int block,
1747                             int sect_size)
1748 {
1749         if (!sb_set_blocksize(sb, sect_size)) {
1750                 mlog(ML_ERROR, "unable to set blocksize\n");
1751                 return -EIO;
1752         }
1753
1754         *bh = sb_getblk(sb, block);
1755         if (!*bh) {
1756                 mlog_errno(-EIO);
1757                 return -EIO;
1758         }
1759         lock_buffer(*bh);
1760         if (!buffer_dirty(*bh))
1761                 clear_buffer_uptodate(*bh);
1762         unlock_buffer(*bh);
1763         ll_rw_block(READ, 1, bh);
1764         wait_on_buffer(*bh);
1765         if (!buffer_uptodate(*bh)) {
1766                 mlog_errno(-EIO);
1767                 brelse(*bh);
1768                 *bh = NULL;
1769                 return -EIO;
1770         }
1771
1772         return 0;
1773 }
1774
1775 static int ocfs2_mount_volume(struct super_block *sb)
1776 {
1777         int status = 0;
1778         int unlock_super = 0;
1779         struct ocfs2_super *osb = OCFS2_SB(sb);
1780
1781         mlog_entry_void();
1782
1783         if (ocfs2_is_hard_readonly(osb))
1784                 goto leave;
1785
1786         status = ocfs2_dlm_init(osb);
1787         if (status < 0) {
1788                 mlog_errno(status);
1789                 goto leave;
1790         }
1791
1792         status = ocfs2_super_lock(osb, 1);
1793         if (status < 0) {
1794                 mlog_errno(status);
1795                 goto leave;
1796         }
1797         unlock_super = 1;
1798
1799         /* This will load up the node map and add ourselves to it. */
1800         status = ocfs2_find_slot(osb);
1801         if (status < 0) {
1802                 mlog_errno(status);
1803                 goto leave;
1804         }
1805
1806         /* load all node-local system inodes */
1807         status = ocfs2_init_local_system_inodes(osb);
1808         if (status < 0) {
1809                 mlog_errno(status);
1810                 goto leave;
1811         }
1812
1813         status = ocfs2_check_volume(osb);
1814         if (status < 0) {
1815                 mlog_errno(status);
1816                 goto leave;
1817         }
1818
1819         status = ocfs2_truncate_log_init(osb);
1820         if (status < 0)
1821                 mlog_errno(status);
1822
1823 leave:
1824         if (unlock_super)
1825                 ocfs2_super_unlock(osb, 1);
1826
1827         mlog_exit(status);
1828         return status;
1829 }
1830
1831 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1832 {
1833         int tmp, hangup_needed = 0;
1834         struct ocfs2_super *osb = NULL;
1835         char nodestr[8];
1836
1837         mlog_entry("(0x%p)\n", sb);
1838
1839         BUG_ON(!sb);
1840         osb = OCFS2_SB(sb);
1841         BUG_ON(!osb);
1842
1843         debugfs_remove(osb->osb_ctxt);
1844
1845         /*
1846          * Flush inode dropping work queue so that deletes are
1847          * performed while the filesystem is still working
1848          */
1849         ocfs2_drop_all_dl_inodes(osb);
1850
1851         /* Orphan scan should be stopped as early as possible */
1852         ocfs2_orphan_scan_stop(osb);
1853
1854         ocfs2_disable_quotas(osb);
1855
1856         ocfs2_shutdown_local_alloc(osb);
1857
1858         ocfs2_truncate_log_shutdown(osb);
1859
1860         /* This will disable recovery and flush any recovery work. */
1861         ocfs2_recovery_exit(osb);
1862
1863         ocfs2_journal_shutdown(osb);
1864
1865         ocfs2_sync_blockdev(sb);
1866
1867         ocfs2_purge_refcount_trees(osb);
1868
1869         /* No cluster connection means we've failed during mount, so skip
1870          * all the steps which depended on that to complete. */
1871         if (osb->cconn) {
1872                 tmp = ocfs2_super_lock(osb, 1);
1873                 if (tmp < 0) {
1874                         mlog_errno(tmp);
1875                         return;
1876                 }
1877         }
1878
1879         if (osb->slot_num != OCFS2_INVALID_SLOT)
1880                 ocfs2_put_slot(osb);
1881
1882         if (osb->cconn)
1883                 ocfs2_super_unlock(osb, 1);
1884
1885         ocfs2_release_system_inodes(osb);
1886
1887         /*
1888          * If we're dismounting due to mount error, mount.ocfs2 will clean
1889          * up heartbeat.  If we're a local mount, there is no heartbeat.
1890          * If we failed before we got a uuid_str yet, we can't stop
1891          * heartbeat.  Otherwise, do it.
1892          */
1893         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1894                 hangup_needed = 1;
1895
1896         if (osb->cconn)
1897                 ocfs2_dlm_shutdown(osb, hangup_needed);
1898
1899         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1900         debugfs_remove(osb->osb_debug_root);
1901
1902         if (hangup_needed)
1903                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1904
1905         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1906
1907         if (ocfs2_mount_local(osb))
1908                 snprintf(nodestr, sizeof(nodestr), "local");
1909         else
1910                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1911
1912         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1913                osb->dev_str, nodestr);
1914
1915         ocfs2_delete_osb(osb);
1916         kfree(osb);
1917         sb->s_dev = 0;
1918         sb->s_fs_info = NULL;
1919 }
1920
1921 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1922                                 unsigned uuid_bytes)
1923 {
1924         int i, ret;
1925         char *ptr;
1926
1927         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1928
1929         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1930         if (osb->uuid_str == NULL)
1931                 return -ENOMEM;
1932
1933         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1934                 /* print with null */
1935                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1936                 if (ret != 2) /* drop super cleans up */
1937                         return -EINVAL;
1938                 /* then only advance past the last char */
1939                 ptr += 2;
1940         }
1941
1942         return 0;
1943 }
1944
1945 static int ocfs2_initialize_super(struct super_block *sb,
1946                                   struct buffer_head *bh,
1947                                   int sector_size,
1948                                   struct ocfs2_blockcheck_stats *stats)
1949 {
1950         int status;
1951         int i, cbits, bbits;
1952         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1953         struct inode *inode = NULL;
1954         struct ocfs2_journal *journal;
1955         __le32 uuid_net_key;
1956         struct ocfs2_super *osb;
1957
1958         mlog_entry_void();
1959
1960         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1961         if (!osb) {
1962                 status = -ENOMEM;
1963                 mlog_errno(status);
1964                 goto bail;
1965         }
1966
1967         sb->s_fs_info = osb;
1968         sb->s_op = &ocfs2_sops;
1969         sb->s_export_op = &ocfs2_export_ops;
1970         sb->s_qcop = &ocfs2_quotactl_ops;
1971         sb->dq_op = &ocfs2_quota_operations;
1972         sb->s_xattr = ocfs2_xattr_handlers;
1973         sb->s_time_gran = 1;
1974         sb->s_flags |= MS_NOATIME;
1975         /* this is needed to support O_LARGEFILE */
1976         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1977         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1978         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1979
1980         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1981
1982         for (i = 0; i < 3; i++)
1983                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1984         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1985
1986         osb->sb = sb;
1987         /* Save off for ocfs2_rw_direct */
1988         osb->s_sectsize_bits = blksize_bits(sector_size);
1989         BUG_ON(!osb->s_sectsize_bits);
1990
1991         spin_lock_init(&osb->dc_task_lock);
1992         init_waitqueue_head(&osb->dc_event);
1993         osb->dc_work_sequence = 0;
1994         osb->dc_wake_sequence = 0;
1995         INIT_LIST_HEAD(&osb->blocked_lock_list);
1996         osb->blocked_lock_count = 0;
1997         spin_lock_init(&osb->osb_lock);
1998         spin_lock_init(&osb->osb_xattr_lock);
1999         ocfs2_init_inode_steal_slot(osb);
2000
2001         atomic_set(&osb->alloc_stats.moves, 0);
2002         atomic_set(&osb->alloc_stats.local_data, 0);
2003         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2004         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2005         atomic_set(&osb->alloc_stats.bg_extends, 0);
2006
2007         /* Copy the blockcheck stats from the superblock probe */
2008         osb->osb_ecc_stats = *stats;
2009
2010         ocfs2_init_node_maps(osb);
2011
2012         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2013                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2014
2015         ocfs2_orphan_scan_init(osb);
2016
2017         status = ocfs2_recovery_init(osb);
2018         if (status) {
2019                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2020                 mlog_errno(status);
2021                 goto bail;
2022         }
2023
2024         init_waitqueue_head(&osb->checkpoint_event);
2025         atomic_set(&osb->needs_checkpoint, 0);
2026
2027         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2028
2029         osb->slot_num = OCFS2_INVALID_SLOT;
2030
2031         osb->s_xattr_inline_size = le16_to_cpu(
2032                                         di->id2.i_super.s_xattr_inline_size);
2033
2034         osb->local_alloc_state = OCFS2_LA_UNUSED;
2035         osb->local_alloc_bh = NULL;
2036         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2037
2038         init_waitqueue_head(&osb->osb_mount_event);
2039
2040         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2041         if (!osb->vol_label) {
2042                 mlog(ML_ERROR, "unable to alloc vol label\n");
2043                 status = -ENOMEM;
2044                 goto bail;
2045         }
2046
2047         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2048         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2049                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2050                      osb->max_slots);
2051                 status = -EINVAL;
2052                 goto bail;
2053         }
2054         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2055
2056         osb->slot_recovery_generations =
2057                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2058                         GFP_KERNEL);
2059         if (!osb->slot_recovery_generations) {
2060                 status = -ENOMEM;
2061                 mlog_errno(status);
2062                 goto bail;
2063         }
2064
2065         init_waitqueue_head(&osb->osb_wipe_event);
2066         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2067                                         sizeof(*osb->osb_orphan_wipes),
2068                                         GFP_KERNEL);
2069         if (!osb->osb_orphan_wipes) {
2070                 status = -ENOMEM;
2071                 mlog_errno(status);
2072                 goto bail;
2073         }
2074
2075         osb->osb_rf_lock_tree = RB_ROOT;
2076
2077         osb->s_feature_compat =
2078                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2079         osb->s_feature_ro_compat =
2080                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2081         osb->s_feature_incompat =
2082                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2083
2084         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2085                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2086                      "optional features (%x).\n", i);
2087                 status = -EINVAL;
2088                 goto bail;
2089         }
2090         if (!(osb->sb->s_flags & MS_RDONLY) &&
2091             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2092                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2093                      "unsupported optional features (%x).\n", i);
2094                 status = -EINVAL;
2095                 goto bail;
2096         }
2097
2098         if (ocfs2_userspace_stack(osb)) {
2099                 memcpy(osb->osb_cluster_stack,
2100                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2101                        OCFS2_STACK_LABEL_LEN);
2102                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2103                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2104                         mlog(ML_ERROR,
2105                              "couldn't mount because of an invalid "
2106                              "cluster stack label (%s) \n",
2107                              osb->osb_cluster_stack);
2108                         status = -EINVAL;
2109                         goto bail;
2110                 }
2111         } else {
2112                 /* The empty string is identical with classic tools that
2113                  * don't know about s_cluster_info. */
2114                 osb->osb_cluster_stack[0] = '\0';
2115         }
2116
2117         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2118
2119         /* FIXME
2120          * This should be done in ocfs2_journal_init(), but unknown
2121          * ordering issues will cause the filesystem to crash.
2122          * If anyone wants to figure out what part of the code
2123          * refers to osb->journal before ocfs2_journal_init() is run,
2124          * be my guest.
2125          */
2126         /* initialize our journal structure */
2127
2128         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2129         if (!journal) {
2130                 mlog(ML_ERROR, "unable to alloc journal\n");
2131                 status = -ENOMEM;
2132                 goto bail;
2133         }
2134         osb->journal = journal;
2135         journal->j_osb = osb;
2136
2137         atomic_set(&journal->j_num_trans, 0);
2138         init_rwsem(&journal->j_trans_barrier);
2139         init_waitqueue_head(&journal->j_checkpointed);
2140         spin_lock_init(&journal->j_lock);
2141         journal->j_trans_id = (unsigned long) 1;
2142         INIT_LIST_HEAD(&journal->j_la_cleanups);
2143         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2144         journal->j_state = OCFS2_JOURNAL_FREE;
2145
2146         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2147         osb->dentry_lock_list = NULL;
2148
2149         /* get some pseudo constants for clustersize bits */
2150         osb->s_clustersize_bits =
2151                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2152         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2153         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2154
2155         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2156             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2157                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2158                      osb->s_clustersize);
2159                 status = -EINVAL;
2160                 goto bail;
2161         }
2162
2163         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2164             > (u32)~0UL) {
2165                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2166                      "what jbd can address in 32 bits.\n");
2167                 status = -EINVAL;
2168                 goto bail;
2169         }
2170
2171         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2172                                  sizeof(di->id2.i_super.s_uuid))) {
2173                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2174                 status = -ENOMEM;
2175                 goto bail;
2176         }
2177
2178         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2179
2180         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2181         osb->vol_label[63] = '\0';
2182         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2183         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2184         osb->first_cluster_group_blkno =
2185                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2186         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2187         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2188         mlog(0, "vol_label: %s\n", osb->vol_label);
2189         mlog(0, "uuid: %s\n", osb->uuid_str);
2190         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2191              (unsigned long long)osb->root_blkno,
2192              (unsigned long long)osb->system_dir_blkno);
2193
2194         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2195         if (!osb->osb_dlm_debug) {
2196                 status = -ENOMEM;
2197                 mlog_errno(status);
2198                 goto bail;
2199         }
2200
2201         atomic_set(&osb->vol_state, VOLUME_INIT);
2202
2203         /* load root, system_dir, and all global system inodes */
2204         status = ocfs2_init_global_system_inodes(osb);
2205         if (status < 0) {
2206                 mlog_errno(status);
2207                 goto bail;
2208         }
2209
2210         /*
2211          * global bitmap
2212          */
2213         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2214                                             OCFS2_INVALID_SLOT);
2215         if (!inode) {
2216                 status = -EINVAL;
2217                 mlog_errno(status);
2218                 goto bail;
2219         }
2220
2221         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2222         iput(inode);
2223
2224         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2225
2226         status = ocfs2_init_slot_info(osb);
2227         if (status < 0) {
2228                 mlog_errno(status);
2229                 goto bail;
2230         }
2231
2232 bail:
2233         mlog_exit(status);
2234         return status;
2235 }
2236
2237 /*
2238  * will return: -EAGAIN if it is ok to keep searching for superblocks
2239  *              -EINVAL if there is a bad superblock
2240  *              0 on success
2241  */
2242 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2243                                struct buffer_head *bh,
2244                                u32 blksz,
2245                                struct ocfs2_blockcheck_stats *stats)
2246 {
2247         int status = -EAGAIN;
2248
2249         mlog_entry_void();
2250
2251         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2252                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2253                 /* We have to do a raw check of the feature here */
2254                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2255                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2256                         status = ocfs2_block_check_validate(bh->b_data,
2257                                                             bh->b_size,
2258                                                             &di->i_check,
2259                                                             stats);
2260                         if (status)
2261                                 goto out;
2262                 }
2263                 status = -EINVAL;
2264                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2265                         mlog(ML_ERROR, "found superblock with incorrect block "
2266                              "size: found %u, should be %u\n",
2267                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2268                                blksz);
2269                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2270                            OCFS2_MAJOR_REV_LEVEL ||
2271                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2272                            OCFS2_MINOR_REV_LEVEL) {
2273                         mlog(ML_ERROR, "found superblock with bad version: "
2274                              "found %u.%u, should be %u.%u\n",
2275                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2276                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2277                              OCFS2_MAJOR_REV_LEVEL,
2278                              OCFS2_MINOR_REV_LEVEL);
2279                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2280                         mlog(ML_ERROR, "bad block number on superblock: "
2281                              "found %llu, should be %llu\n",
2282                              (unsigned long long)le64_to_cpu(di->i_blkno),
2283                              (unsigned long long)bh->b_blocknr);
2284                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2285                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2286                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2287                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2288                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2289                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2290                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2291                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2292                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2293                         mlog(ML_ERROR,
2294                              "Superblock slots found greater than file system "
2295                              "maximum: found %u, max %u\n",
2296                              le16_to_cpu(di->id2.i_super.s_max_slots),
2297                              OCFS2_MAX_SLOTS);
2298                 } else {
2299                         /* found it! */
2300                         status = 0;
2301                 }
2302         }
2303
2304 out:
2305         mlog_exit(status);
2306         return status;
2307 }
2308
2309 static int ocfs2_check_volume(struct ocfs2_super *osb)
2310 {
2311         int status;
2312         int dirty;
2313         int local;
2314         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2315                                                   * recover
2316                                                   * ourselves. */
2317
2318         mlog_entry_void();
2319
2320         /* Init our journal object. */
2321         status = ocfs2_journal_init(osb->journal, &dirty);
2322         if (status < 0) {
2323                 mlog(ML_ERROR, "Could not initialize journal!\n");
2324                 goto finally;
2325         }
2326
2327         /* If the journal was unmounted cleanly then we don't want to
2328          * recover anything. Otherwise, journal_load will do that
2329          * dirty work for us :) */
2330         if (!dirty) {
2331                 status = ocfs2_journal_wipe(osb->journal, 0);
2332                 if (status < 0) {
2333                         mlog_errno(status);
2334                         goto finally;
2335                 }
2336         } else {
2337                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2338                      "recovering volume.\n");
2339         }
2340
2341         local = ocfs2_mount_local(osb);
2342
2343         /* will play back anything left in the journal. */
2344         status = ocfs2_journal_load(osb->journal, local, dirty);
2345         if (status < 0) {
2346                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2347                 goto finally;
2348         }
2349
2350         if (dirty) {
2351                 /* recover my local alloc if we didn't unmount cleanly. */
2352                 status = ocfs2_begin_local_alloc_recovery(osb,
2353                                                           osb->slot_num,
2354                                                           &local_alloc);
2355                 if (status < 0) {
2356                         mlog_errno(status);
2357                         goto finally;
2358                 }
2359                 /* we complete the recovery process after we've marked
2360                  * ourselves as mounted. */
2361         }
2362
2363         mlog(0, "Journal loaded.\n");
2364
2365         status = ocfs2_load_local_alloc(osb);
2366         if (status < 0) {
2367                 mlog_errno(status);
2368                 goto finally;
2369         }
2370
2371         if (dirty) {
2372                 /* Recovery will be completed after we've mounted the
2373                  * rest of the volume. */
2374                 osb->dirty = 1;
2375                 osb->local_alloc_copy = local_alloc;
2376                 local_alloc = NULL;
2377         }
2378
2379         /* go through each journal, trylock it and if you get the
2380          * lock, and it's marked as dirty, set the bit in the recover
2381          * map and launch a recovery thread for it. */
2382         status = ocfs2_mark_dead_nodes(osb);
2383         if (status < 0) {
2384                 mlog_errno(status);
2385                 goto finally;
2386         }
2387
2388         status = ocfs2_compute_replay_slots(osb);
2389         if (status < 0)
2390                 mlog_errno(status);
2391
2392 finally:
2393         if (local_alloc)
2394                 kfree(local_alloc);
2395
2396         mlog_exit(status);
2397         return status;
2398 }
2399
2400 /*
2401  * The routine gets called from dismount or close whenever a dismount on
2402  * volume is requested and the osb open count becomes 1.
2403  * It will remove the osb from the global list and also free up all the
2404  * initialized resources and fileobject.
2405  */
2406 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2407 {
2408         mlog_entry_void();
2409
2410         /* This function assumes that the caller has the main osb resource */
2411
2412         ocfs2_free_slot_info(osb);
2413
2414         kfree(osb->osb_orphan_wipes);
2415         kfree(osb->slot_recovery_generations);
2416         /* FIXME
2417          * This belongs in journal shutdown, but because we have to
2418          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2419          * we free it here.
2420          */
2421         kfree(osb->journal);
2422         if (osb->local_alloc_copy)
2423                 kfree(osb->local_alloc_copy);
2424         kfree(osb->uuid_str);
2425         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2426         memset(osb, 0, sizeof(struct ocfs2_super));
2427
2428         mlog_exit_void();
2429 }
2430
2431 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2432  * panic(). We do not support continue-on-error operation. */
2433 static void ocfs2_handle_error(struct super_block *sb)
2434 {
2435         struct ocfs2_super *osb = OCFS2_SB(sb);
2436
2437         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2438                 panic("OCFS2: (device %s): panic forced after error\n",
2439                       sb->s_id);
2440
2441         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2442
2443         if (sb->s_flags & MS_RDONLY &&
2444             (ocfs2_is_soft_readonly(osb) ||
2445              ocfs2_is_hard_readonly(osb)))
2446                 return;
2447
2448         printk(KERN_CRIT "File system is now read-only due to the potential "
2449                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2450                "system is unmounted.\n");
2451         sb->s_flags |= MS_RDONLY;
2452         ocfs2_set_ro_flag(osb, 0);
2453 }
2454
2455 static char error_buf[1024];
2456
2457 void __ocfs2_error(struct super_block *sb,
2458                    const char *function,
2459                    const char *fmt, ...)
2460 {
2461         va_list args;
2462
2463         va_start(args, fmt);
2464         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2465         va_end(args);
2466
2467         /* Not using mlog here because we want to show the actual
2468          * function the error came from. */
2469         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2470                sb->s_id, function, error_buf);
2471
2472         ocfs2_handle_error(sb);
2473 }
2474
2475 /* Handle critical errors. This is intentionally more drastic than
2476  * ocfs2_handle_error, so we only use for things like journal errors,
2477  * etc. */
2478 void __ocfs2_abort(struct super_block* sb,
2479                    const char *function,
2480                    const char *fmt, ...)
2481 {
2482         va_list args;
2483
2484         va_start(args, fmt);
2485         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2486         va_end(args);
2487
2488         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2489                sb->s_id, function, error_buf);
2490
2491         /* We don't have the cluster support yet to go straight to
2492          * hard readonly in here. Until then, we want to keep
2493          * ocfs2_abort() so that we can at least mark critical
2494          * errors.
2495          *
2496          * TODO: This should abort the journal and alert other nodes
2497          * that our slot needs recovery. */
2498
2499         /* Force a panic(). This stinks, but it's better than letting
2500          * things continue without having a proper hard readonly
2501          * here. */
2502         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2503                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2504         ocfs2_handle_error(sb);
2505 }
2506
2507 module_init(ocfs2_init);
2508 module_exit(ocfs2_exit);