fs/ocfs2/super.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/init.h>
  32 #include <linux/random.h>
  33 #include <linux/statfs.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/socket.h>
  37 #include <linux/inet.h>
  38 #include <linux/parser.h>
  39 #include <linux/crc32.h>
  40 #include <linux/debugfs.h>
  41 #include <linux/mount.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/quotaops.h>
  44 #include <linux/smp_lock.h>
  45
  46 #define MLOG_MASK_PREFIX ML_SUPER
  47 #include <cluster/masklog.h>
  48
  49 #include "ocfs2.h"
  50
  51 /* this should be the only file to include a version 1 header */
  52 #include "ocfs1_fs_compat.h"
  53
  54 #include "alloc.h"
  55 #include "blockcheck.h"
  56 #include "dlmglue.h"
  57 #include "export.h"
  58 #include "extent_map.h"
  59 #include "heartbeat.h"
  60 #include "inode.h"
  61 #include "journal.h"
  62 #include "localalloc.h"
  63 #include "namei.h"
  64 #include "slot_map.h"
  65 #include "super.h"
  66 #include "sysfile.h"
  67 #include "uptodate.h"
  68 #include "ver.h"
  69 #include "xattr.h"
  70 #include "quota.h"
  71 #include "refcounttree.h"
  72 #include "suballoc.h"
  73
  74 #include "buffer_head_io.h"
  75
  76 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  77 struct kmem_cache *ocfs2_dquot_cachep;
  78 struct kmem_cache *ocfs2_qf_chunk_cachep;
  79
  80 /* OCFS2 needs to schedule several differnt types of work which
  81  * require cluster locking, disk I/O, recovery waits, etc. Since these
  82  * types of work tend to be heavy we avoid using the kernel events
  83  * workqueue and schedule on our own. */
  84 struct workqueue_struct *ocfs2_wq = NULL;
  85
  86 static struct dentry *ocfs2_debugfs_root = NULL;
  87
  88 MODULE_AUTHOR("Oracle");
  89 MODULE_LICENSE("GPL");
  90
  91 struct mount_options
  92 {
  93         unsigned long   commit_interval;
  94         unsigned long   mount_opt;
  95         unsigned int    atime_quantum;
  96         signed short    slot;
  97         unsigned int    localalloc_opt;
  98         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  99 };
 100
 101 static int ocfs2_parse_options(struct super_block *sb, char *options,
 102                                struct mount_options *mopt,
 103                                int is_remount);
 104 static int ocfs2_check_set_options(struct super_block *sb,
 105                                    struct mount_options *options);
 106 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 107 static void ocfs2_put_super(struct super_block *sb);
 108 static int ocfs2_mount_volume(struct super_block *sb);
 109 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 110 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 111 static int ocfs2_initialize_mem_caches(void);
 112 static void ocfs2_free_mem_caches(void);
 113 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 114
 115 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 116
 117 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 118
 119 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 120 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 121 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 122 static int ocfs2_check_volume(struct ocfs2_super *osb);
 123 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 124                                struct buffer_head *bh,
 125                                u32 sectsize,
 126                                struct ocfs2_blockcheck_stats *stats);
 127 static int ocfs2_initialize_super(struct super_block *sb,
 128                                   struct buffer_head *bh,
 129                                   int sector_size,
 130                                   struct ocfs2_blockcheck_stats *stats);
 131 static int ocfs2_get_sector(struct super_block *sb,
 132                             struct buffer_head **bh,
 133                             int block,
 134                             int sect_size);
 135 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 136 static void ocfs2_destroy_inode(struct inode *inode);
 137 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 138 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 139 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 140
 141 static const struct super_operations ocfs2_sops = {
 142         .statfs         = ocfs2_statfs,
 143         .alloc_inode    = ocfs2_alloc_inode,
 144         .destroy_inode  = ocfs2_destroy_inode,
 145         .drop_inode     = ocfs2_drop_inode,
 146         .clear_inode    = ocfs2_clear_inode,
 147         .delete_inode   = ocfs2_delete_inode,
 148         .sync_fs        = ocfs2_sync_fs,
 149         .put_super      = ocfs2_put_super,
 150         .remount_fs     = ocfs2_remount,
 151         .show_options   = ocfs2_show_options,
 152         .quota_read     = ocfs2_quota_read,
 153         .quota_write    = ocfs2_quota_write,
 154 };
 155
 156 enum {
 157         Opt_barrier,
 158         Opt_err_panic,
 159         Opt_err_ro,
 160         Opt_intr,
 161         Opt_nointr,
 162         Opt_hb_none,
 163         Opt_hb_local,
 164         Opt_data_ordered,
 165         Opt_data_writeback,
 166         Opt_atime_quantum,
 167         Opt_slot,
 168         Opt_commit,
 169         Opt_localalloc,
 170         Opt_localflocks,
 171         Opt_stack,
 172         Opt_user_xattr,
 173         Opt_nouser_xattr,
 174         Opt_inode64,
 175         Opt_acl,
 176         Opt_noacl,
 177         Opt_usrquota,
 178         Opt_grpquota,
 179         Opt_err,
 180 };
 181
 182 static const match_table_t tokens = {
 183         {Opt_barrier, "barrier=%u"},
 184         {Opt_err_panic, "errors=panic"},
 185         {Opt_err_ro, "errors=remount-ro"},
 186         {Opt_intr, "intr"},
 187         {Opt_nointr, "nointr"},
 188         {Opt_hb_none, OCFS2_HB_NONE},
 189         {Opt_hb_local, OCFS2_HB_LOCAL},
 190         {Opt_data_ordered, "data=ordered"},
 191         {Opt_data_writeback, "data=writeback"},
 192         {Opt_atime_quantum, "atime_quantum=%u"},
 193         {Opt_slot, "preferred_slot=%u"},
 194         {Opt_commit, "commit=%u"},
 195         {Opt_localalloc, "localalloc=%d"},
 196         {Opt_localflocks, "localflocks"},
 197         {Opt_stack, "cluster_stack=%s"},
 198         {Opt_user_xattr, "user_xattr"},
 199         {Opt_nouser_xattr, "nouser_xattr"},
 200         {Opt_inode64, "inode64"},
 201         {Opt_acl, "acl"},
 202         {Opt_noacl, "noacl"},
 203         {Opt_usrquota, "usrquota"},
 204         {Opt_grpquota, "grpquota"},
 205         {Opt_err, NULL}
 206 };
 207
 208 #ifdef CONFIG_DEBUG_FS
 209 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 210 {
 211         struct ocfs2_cluster_connection *cconn = osb->cconn;
 212         struct ocfs2_recovery_map *rm = osb->recovery_map;
 213         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 214         int i, out = 0;
 215
 216         out += snprintf(buf + out, len - out,
 217                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 218                         "Device", osb->dev_str, osb->uuid_str,
 219                         osb->fs_generation, osb->vol_label);
 220
 221         out += snprintf(buf + out, len - out,
 222                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 223                         atomic_read(&osb->vol_state), osb->osb_flags);
 224
 225         out += snprintf(buf + out, len - out,
 226                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 227                         osb->sb->s_blocksize, osb->s_clustersize);
 228
 229         out += snprintf(buf + out, len - out,
 230                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 231                         "ROcompat: 0x%X\n",
 232                         "Features", osb->s_feature_compat,
 233                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 234
 235         out += snprintf(buf + out, len - out,
 236                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 237                         osb->s_mount_opt, osb->s_atime_quantum);
 238
 239         if (cconn) {
 240                 out += snprintf(buf + out, len - out,
 241                                 "%10s => Stack: %s  Name: %*s  "
 242                                 "Version: %d.%d\n", "Cluster",
 243                                 (*osb->osb_cluster_stack == '\0' ?
 244                                  "o2cb" : osb->osb_cluster_stack),
 245                                 cconn->cc_namelen, cconn->cc_name,
 246                                 cconn->cc_version.pv_major,
 247                                 cconn->cc_version.pv_minor);
 248         }
 249
 250         spin_lock(&osb->dc_task_lock);
 251         out += snprintf(buf + out, len - out,
 252                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 253                         "WorkSeq: %lu\n", "DownCnvt",
 254                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 255                         osb->blocked_lock_count, osb->dc_wake_sequence,
 256                         osb->dc_work_sequence);
 257         spin_unlock(&osb->dc_task_lock);
 258
 259         spin_lock(&osb->osb_lock);
 260         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 261                         "Recovery",
 262                         (osb->recovery_thread_task ?
 263                          task_pid_nr(osb->recovery_thread_task) : -1));
 264         if (rm->rm_used == 0)
 265                 out += snprintf(buf + out, len - out, " None\n");
 266         else {
 267                 for (i = 0; i < rm->rm_used; i++)
 268                         out += snprintf(buf + out, len - out, " %d",
 269                                         rm->rm_entries[i]);
 270                 out += snprintf(buf + out, len - out, "\n");
 271         }
 272         spin_unlock(&osb->osb_lock);
 273
 274         out += snprintf(buf + out, len - out,
 275                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 276                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 277                         osb->osb_commit_interval,
 278                         atomic_read(&osb->needs_checkpoint));
 279
 280         out += snprintf(buf + out, len - out,
 281                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 282                         "Journal", osb->journal->j_state,
 283                         osb->journal->j_trans_id,
 284                         atomic_read(&osb->journal->j_num_trans));
 285
 286         out += snprintf(buf + out, len - out,
 287                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 288                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 289                         "Stats",
 290                         atomic_read(&osb->alloc_stats.bitmap_data),
 291                         atomic_read(&osb->alloc_stats.local_data),
 292                         atomic_read(&osb->alloc_stats.bg_allocs),
 293                         atomic_read(&osb->alloc_stats.moves),
 294                         atomic_read(&osb->alloc_stats.bg_extends));
 295
 296         out += snprintf(buf + out, len - out,
 297                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 298                         "Default: %u bits\n",
 299                         "LocalAlloc", osb->local_alloc_state,
 300                         (unsigned long long)osb->la_last_gd,
 301                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 302
 303         spin_lock(&osb->osb_lock);
 304         out += snprintf(buf + out, len - out,
 305                         "%10s => InodeSlot: %d  StolenInodes: %d, "
 306                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
 307                         osb->s_inode_steal_slot,
 308                         atomic_read(&osb->s_num_inodes_stolen),
 309                         osb->s_meta_steal_slot,
 310                         atomic_read(&osb->s_num_meta_stolen));
 311         spin_unlock(&osb->osb_lock);
 312
 313         out += snprintf(buf + out, len - out, "OrphanScan => ");
 314         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 315                         os->os_count, os->os_seqno);
 316         out += snprintf(buf + out, len - out, " Last Scan: ");
 317         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 318                 out += snprintf(buf + out, len - out, "Disabled\n");
 319         else
 320                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 321                                 (get_seconds() - os->os_scantime.tv_sec));
 322
 323         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 324                         "Slots", "Num", "RecoGen");
 325         for (i = 0; i < osb->max_slots; ++i) {
 326                 out += snprintf(buf + out, len - out,
 327                                 "%10s  %c %3d  %10d\n",
 328                                 " ",
 329                                 (i == osb->slot_num ? '*' : ' '),
 330                                 i, osb->slot_recovery_generations[i]);
 331         }
 332
 333         return out;
 334 }
 335
 336 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 337 {
 338         struct ocfs2_super *osb = inode->i_private;
 339         char *buf = NULL;
 340
 341         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 342         if (!buf)
 343                 goto bail;
 344
 345         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 346
 347         file->private_data = buf;
 348
 349         return 0;
 350 bail:
 351         return -ENOMEM;
 352 }
 353
 354 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 355 {
 356         kfree(file->private_data);
 357         return 0;
 358 }
 359
 360 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 361                                 size_t nbytes, loff_t *ppos)
 362 {
 363         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 364                                        i_size_read(file->f_mapping->host));
 365 }
 366 #else
 367 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 368 {
 369         return 0;
 370 }
 371 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 372 {
 373         return 0;
 374 }
 375 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 376                                 size_t nbytes, loff_t *ppos)
 377 {
 378         return 0;
 379 }
 380 #endif  /* CONFIG_DEBUG_FS */
 381
 382 static const struct file_operations ocfs2_osb_debug_fops = {
 383         .open =         ocfs2_osb_debug_open,
 384         .release =      ocfs2_debug_release,
 385         .read =         ocfs2_debug_read,
 386         .llseek =       generic_file_llseek,
 387 };
 388
 389 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 390 {
 391         int status;
 392         tid_t target;
 393         struct ocfs2_super *osb = OCFS2_SB(sb);
 394
 395         if (ocfs2_is_hard_readonly(osb))
 396                 return -EROFS;
 397
 398         if (wait) {
 399                 status = ocfs2_flush_truncate_log(osb);
 400                 if (status < 0)
 401                         mlog_errno(status);
 402         } else {
 403                 ocfs2_schedule_truncate_log_flush(osb, 0);
 404         }
 405
 406         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 407                                       &target)) {
 408                 if (wait)
 409                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 410                                              target);
 411         }
 412         return 0;
 413 }
 414
 415 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 416 {
 417         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 418             && (ino == USER_QUOTA_SYSTEM_INODE
 419                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 420                 return 0;
 421         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 422             && (ino == GROUP_QUOTA_SYSTEM_INODE
 423                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 424                 return 0;
 425         return 1;
 426 }
 427
 428 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 429 {
 430         struct inode *new = NULL;
 431         int status = 0;
 432         int i;
 433
 434         mlog_entry_void();
 435
 436         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 437         if (IS_ERR(new)) {
 438                 status = PTR_ERR(new);
 439                 mlog_errno(status);
 440                 goto bail;
 441         }
 442         osb->root_inode = new;
 443
 444         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 445         if (IS_ERR(new)) {
 446                 status = PTR_ERR(new);
 447                 mlog_errno(status);
 448                 goto bail;
 449         }
 450         osb->sys_root_inode = new;
 451
 452         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 453              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 454                 if (!ocfs2_need_system_inode(osb, i))
 455                         continue;
 456                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 457                 if (!new) {
 458                         ocfs2_release_system_inodes(osb);
 459                         status = -EINVAL;
 460                         mlog_errno(status);
 461                         /* FIXME: Should ERROR_RO_FS */
 462                         mlog(ML_ERROR, "Unable to load system inode %d, "
 463                              "possibly corrupt fs?", i);
 464                         goto bail;
 465                 }
 466                 // the array now has one ref, so drop this one
 467                 iput(new);
 468         }
 469
 470 bail:
 471         mlog_exit(status);
 472         return status;
 473 }
 474
 475 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 476 {
 477         struct inode *new = NULL;
 478         int status = 0;
 479         int i;
 480
 481         mlog_entry_void();
 482
 483         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 484              i < NUM_SYSTEM_INODES;
 485              i++) {
 486                 if (!ocfs2_need_system_inode(osb, i))
 487                         continue;
 488                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 489                 if (!new) {
 490                         ocfs2_release_system_inodes(osb);
 491                         status = -EINVAL;
 492                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 493                              status, i, osb->slot_num);
 494                         goto bail;
 495                 }
 496                 /* the array now has one ref, so drop this one */
 497                 iput(new);
 498         }
 499
 500 bail:
 501         mlog_exit(status);
 502         return status;
 503 }
 504
 505 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 506 {
 507         int i;
 508         struct inode *inode;
 509
 510         mlog_entry_void();
 511
 512         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 513                 inode = osb->system_inodes[i];
 514                 if (inode) {
 515                         iput(inode);
 516                         osb->system_inodes[i] = NULL;
 517                 }
 518         }
 519
 520         inode = osb->sys_root_inode;
 521         if (inode) {
 522                 iput(inode);
 523                 osb->sys_root_inode = NULL;
 524         }
 525
 526         inode = osb->root_inode;
 527         if (inode) {
 528                 iput(inode);
 529                 osb->root_inode = NULL;
 530         }
 531
 532         mlog_exit(0);
 533 }
 534
 535 /* We're allocating fs objects, use GFP_NOFS */
 536 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 537 {
 538         struct ocfs2_inode_info *oi;
 539
 540         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 541         if (!oi)
 542                 return NULL;
 543
 544         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 545         return &oi->vfs_inode;
 546 }
 547
 548 static void ocfs2_destroy_inode(struct inode *inode)
 549 {
 550         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 551 }
 552
 553 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 554                                                 unsigned int cbits)
 555 {
 556         unsigned int bytes = 1 << cbits;
 557         unsigned int trim = bytes;
 558         unsigned int bitshift = 32;
 559
 560         /*
 561          * i_size and all block offsets in ocfs2 are always 64 bits
 562          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 563          * 64 bit platforms, cluster size will be the limiting factor.
 564          */
 565
 566 #if BITS_PER_LONG == 32
 567 # if defined(CONFIG_LBDAF)
 568         BUILD_BUG_ON(sizeof(sector_t) != 8);
 569         /*
 570          * We might be limited by page cache size.
 571          */
 572         if (bytes > PAGE_CACHE_SIZE) {
 573                 bytes = PAGE_CACHE_SIZE;
 574                 trim = 1;
 575                 /*
 576                  * Shift by 31 here so that we don't get larger than
 577                  * MAX_LFS_FILESIZE
 578                  */
 579                 bitshift = 31;
 580         }
 581 # else
 582         /*
 583          * We are limited by the size of sector_t. Use block size, as
 584          * that's what we expose to the VFS.
 585          */
 586         bytes = 1 << bbits;
 587         trim = 1;
 588         bitshift = 31;
 589 # endif
 590 #endif
 591
 592         /*
 593          * Trim by a whole cluster when we can actually approach the
 594          * on-disk limits. Otherwise we can overflow i_clusters when
 595          * an extent start is at the max offset.
 596          */
 597         return (((unsigned long long)bytes) << bitshift) - trim;
 598 }
 599
 600 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 601 {
 602         int incompat_features;
 603         int ret = 0;
 604         struct mount_options parsed_options;
 605         struct ocfs2_super *osb = OCFS2_SB(sb);
 606
 607         lock_kernel();
 608
 609         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
 610             !ocfs2_check_set_options(sb, &parsed_options)) {
 611                 ret = -EINVAL;
 612                 goto out;
 613         }
 614
 615         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 616             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 617                 ret = -EINVAL;
 618                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 619                 goto out;
 620         }
 621
 622         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 623             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 624                 ret = -EINVAL;
 625                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 626                 goto out;
 627         }
 628
 629         /* Probably don't want this on remount; it might
 630          * mess with other nodes */
 631         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 632             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 633                 ret = -EINVAL;
 634                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 635                 goto out;
 636         }
 637
 638         /* We're going to/from readonly mode. */
 639         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 640                 /* Disable quota accounting before remounting RO */
 641                 if (*flags & MS_RDONLY) {
 642                         ret = ocfs2_susp_quotas(osb, 0);
 643                         if (ret < 0)
 644                                 goto out;
 645                 }
 646                 /* Lock here so the check of HARD_RO and the potential
 647                  * setting of SOFT_RO is atomic. */
 648                 spin_lock(&osb->osb_lock);
 649                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 650                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 651                         ret = -EROFS;
 652                         goto unlock_osb;
 653                 }
 654
 655                 if (*flags & MS_RDONLY) {
 656                         mlog(0, "Going to ro mode.\n");
 657                         sb->s_flags |= MS_RDONLY;
 658                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 659                 } else {
 660                         mlog(0, "Making ro filesystem writeable.\n");
 661
 662                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 663                                 mlog(ML_ERROR, "Cannot remount RDWR "
 664                                      "filesystem due to previous errors.\n");
 665                                 ret = -EROFS;
 666                                 goto unlock_osb;
 667                         }
 668                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 669                         if (incompat_features) {
 670                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 671                                      "of unsupported optional features "
 672                                      "(%x).\n", incompat_features);
 673                                 ret = -EINVAL;
 674                                 goto unlock_osb;
 675                         }
 676                         sb->s_flags &= ~MS_RDONLY;
 677                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 678                 }
 679 unlock_osb:
 680                 spin_unlock(&osb->osb_lock);
 681                 /* Enable quota accounting after remounting RW */
 682                 if (!ret && !(*flags & MS_RDONLY)) {
 683                         if (sb_any_quota_suspended(sb))
 684                                 ret = ocfs2_susp_quotas(osb, 1);
 685                         else
 686                                 ret = ocfs2_enable_quotas(osb);
 687                         if (ret < 0) {
 688                                 /* Return back changes... */
 689                                 spin_lock(&osb->osb_lock);
 690                                 sb->s_flags |= MS_RDONLY;
 691                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 692                                 spin_unlock(&osb->osb_lock);
 693                                 goto out;
 694                         }
 695                 }
 696         }
 697
 698         if (!ret) {
 699                 /* Only save off the new mount options in case of a successful
 700                  * remount. */
 701                 osb->s_mount_opt = parsed_options.mount_opt;
 702                 osb->s_atime_quantum = parsed_options.atime_quantum;
 703                 osb->preferred_slot = parsed_options.slot;
 704                 if (parsed_options.commit_interval)
 705                         osb->osb_commit_interval = parsed_options.commit_interval;
 706
 707                 if (!ocfs2_is_hard_readonly(osb))
 708                         ocfs2_set_journal_params(osb);
 709
 710                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 711                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
 712                                                         MS_POSIXACL : 0);
 713         }
 714 out:
 715         unlock_kernel();
 716         return ret;
 717 }
 718
 719 static int ocfs2_sb_probe(struct super_block *sb,
 720                           struct buffer_head **bh,
 721                           int *sector_size,
 722                           struct ocfs2_blockcheck_stats *stats)
 723 {
 724         int status, tmpstat;
 725         struct ocfs1_vol_disk_hdr *hdr;
 726         struct ocfs2_dinode *di;
 727         int blksize;
 728
 729         *bh = NULL;
 730
 731         /* may be > 512 */
 732         *sector_size = bdev_logical_block_size(sb->s_bdev);
 733         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 734                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 735                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 736                 status = -EINVAL;
 737                 goto bail;
 738         }
 739
 740         /* Can this really happen? */
 741         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 742                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 743
 744         /* check block zero for old format */
 745         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 746         if (status < 0) {
 747                 mlog_errno(status);
 748                 goto bail;
 749         }
 750         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 751         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 752                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 753                      hdr->major_version, hdr->minor_version);
 754                 status = -EINVAL;
 755         }
 756         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 757                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 758                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 759                      hdr->signature);
 760                 status = -EINVAL;
 761         }
 762         brelse(*bh);
 763         *bh = NULL;
 764         if (status < 0) {
 765                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 766                      "upgraded before mounting with ocfs v2\n");
 767                 goto bail;
 768         }
 769
 770         /*
 771          * Now check at magic offset for 512, 1024, 2048, 4096
 772          * blocksizes.  4096 is the maximum blocksize because it is
 773          * the minimum clustersize.
 774          */
 775         status = -EINVAL;
 776         for (blksize = *sector_size;
 777              blksize <= OCFS2_MAX_BLOCKSIZE;
 778              blksize <<= 1) {
 779                 tmpstat = ocfs2_get_sector(sb, bh,
 780                                            OCFS2_SUPER_BLOCK_BLKNO,
 781                                            blksize);
 782                 if (tmpstat < 0) {
 783                         status = tmpstat;
 784                         mlog_errno(status);
 785                         break;
 786                 }
 787                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 788                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 789                 spin_lock_init(&stats->b_lock);
 790                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 791                 if (tmpstat < 0) {
 792                         brelse(*bh);
 793                         *bh = NULL;
 794                 }
 795                 if (tmpstat != -EAGAIN) {
 796                         status = tmpstat;
 797                         break;
 798                 }
 799         }
 800
 801 bail:
 802         return status;
 803 }
 804
 805 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 806 {
 807         if (ocfs2_mount_local(osb)) {
 808                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 809                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 810                              "mounted device.\n");
 811                         return -EINVAL;
 812                 }
 813         }
 814
 815         if (ocfs2_userspace_stack(osb)) {
 816                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 817                         mlog(ML_ERROR, "Userspace stack expected, but "
 818                              "o2cb heartbeat arguments passed to mount\n");
 819                         return -EINVAL;
 820                 }
 821         }
 822
 823         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 824                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 825                     !ocfs2_userspace_stack(osb)) {
 826                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 827                              "a read-write clustered device.\n");
 828                         return -EINVAL;
 829                 }
 830         }
 831
 832         return 0;
 833 }
 834
 835 /*
 836  * If we're using a userspace stack, mount should have passed
 837  * a name that matches the disk.  If not, mount should not
 838  * have passed a stack.
 839  */
 840 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 841                                         struct mount_options *mopt)
 842 {
 843         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 844                 mlog(ML_ERROR,
 845                      "cluster stack passed to mount, but this filesystem "
 846                      "does not support it\n");
 847                 return -EINVAL;
 848         }
 849
 850         if (ocfs2_userspace_stack(osb) &&
 851             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 852                     OCFS2_STACK_LABEL_LEN)) {
 853                 mlog(ML_ERROR,
 854                      "cluster stack passed to mount (\"%s\") does not "
 855                      "match the filesystem (\"%s\")\n",
 856                      mopt->cluster_stack,
 857                      osb->osb_cluster_stack);
 858                 return -EINVAL;
 859         }
 860
 861         return 0;
 862 }
 863
 864 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 865 {
 866         int type;
 867         struct super_block *sb = osb->sb;
 868         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 869                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 870         int status = 0;
 871
 872         for (type = 0; type < MAXQUOTAS; type++) {
 873                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 874                         continue;
 875                 if (unsuspend)
 876                         status = vfs_quota_enable(
 877                                         sb_dqopt(sb)->files[type],
 878                                         type, QFMT_OCFS2,
 879                                         DQUOT_SUSPENDED);
 880                 else
 881                         status = vfs_quota_disable(sb, type,
 882                                                    DQUOT_SUSPENDED);
 883                 if (status < 0)
 884                         break;
 885         }
 886         if (status < 0)
 887                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 888                      "remount (error = %d).\n", status);
 889         return status;
 890 }
 891
 892 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 893 {
 894         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 895         struct super_block *sb = osb->sb;
 896         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 897                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 898         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 899                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 900         int status;
 901         int type;
 902
 903         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 904         for (type = 0; type < MAXQUOTAS; type++) {
 905                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 906                         continue;
 907                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 908                                                         osb->slot_num);
 909                 if (!inode[type]) {
 910                         status = -ENOENT;
 911                         goto out_quota_off;
 912                 }
 913                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 914                                                 DQUOT_USAGE_ENABLED);
 915                 if (status < 0)
 916                         goto out_quota_off;
 917         }
 918
 919         for (type = 0; type < MAXQUOTAS; type++)
 920                 iput(inode[type]);
 921         return 0;
 922 out_quota_off:
 923         ocfs2_disable_quotas(osb);
 924         for (type = 0; type < MAXQUOTAS; type++)
 925                 iput(inode[type]);
 926         mlog_errno(status);
 927         return status;
 928 }
 929
 930 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 931 {
 932         int type;
 933         struct inode *inode;
 934         struct super_block *sb = osb->sb;
 935
 936         /* We mostly ignore errors in this function because there's not much
 937          * we can do when we see them */
 938         for (type = 0; type < MAXQUOTAS; type++) {
 939                 if (!sb_has_quota_loaded(sb, type))
 940                         continue;
 941                 inode = igrab(sb->s_dquot.files[type]);
 942                 /* Turn off quotas. This will remove all dquot structures from
 943                  * memory and so they will be automatically synced to global
 944                  * quota files */
 945                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 946                                             DQUOT_LIMITS_ENABLED);
 947                 if (!inode)
 948                         continue;
 949                 iput(inode);
 950         }
 951 }
 952
 953 /* Handle quota on quotactl */
 954 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 955                           char *path, int remount)
 956 {
 957         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 958                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 959
 960         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 961                 return -EINVAL;
 962
 963         if (remount)
 964                 return 0;       /* Just ignore it has been handled in
 965                                  * ocfs2_remount() */
 966         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 967                                     format_id, DQUOT_LIMITS_ENABLED);
 968 }
 969
 970 /* Handle quota off quotactl */
 971 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 972 {
 973         if (remount)
 974                 return 0;       /* Ignore now and handle later in
 975                                  * ocfs2_remount() */
 976         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 977 }
 978
 979 static const struct quotactl_ops ocfs2_quotactl_ops = {
 980         .quota_on       = ocfs2_quota_on,
 981         .quota_off      = ocfs2_quota_off,
 982         .quota_sync     = vfs_quota_sync,
 983         .get_info       = vfs_get_dqinfo,
 984         .set_info       = vfs_set_dqinfo,
 985         .get_dqblk      = vfs_get_dqblk,
 986         .set_dqblk      = vfs_set_dqblk,
 987 };
 988
 989 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 990 {
 991         struct dentry *root;
 992         int status, sector_size;
 993         struct mount_options parsed_options;
 994         struct inode *inode = NULL;
 995         struct ocfs2_super *osb = NULL;
 996         struct buffer_head *bh = NULL;
 997         char nodestr[8];
 998         struct ocfs2_blockcheck_stats stats;
 999
1000         mlog_entry("%p, %p, %i", sb, data, silent);
1001
1002         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1003                 status = -EINVAL;
1004                 goto read_super_error;
1005         }
1006
1007         /* probe for superblock */
1008         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1009         if (status < 0) {
1010                 mlog(ML_ERROR, "superblock probe failed!\n");
1011                 goto read_super_error;
1012         }
1013
1014         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1015         osb = OCFS2_SB(sb);
1016         if (status < 0) {
1017                 mlog_errno(status);
1018                 goto read_super_error;
1019         }
1020         brelse(bh);
1021         bh = NULL;
1022
1023         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1024                 status = -EINVAL;
1025                 goto read_super_error;
1026         }
1027         osb->s_mount_opt = parsed_options.mount_opt;
1028         osb->s_atime_quantum = parsed_options.atime_quantum;
1029         osb->preferred_slot = parsed_options.slot;
1030         osb->osb_commit_interval = parsed_options.commit_interval;
1031         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1032         osb->local_alloc_bits = osb->local_alloc_default_bits;
1033
1034         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1035         if (status)
1036                 goto read_super_error;
1037
1038         sb->s_magic = OCFS2_SUPER_MAGIC;
1039
1040         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1041                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1042
1043         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1044          * heartbeat=none */
1045         if (bdev_read_only(sb->s_bdev)) {
1046                 if (!(sb->s_flags & MS_RDONLY)) {
1047                         status = -EACCES;
1048                         mlog(ML_ERROR, "Readonly device detected but readonly "
1049                              "mount was not specified.\n");
1050                         goto read_super_error;
1051                 }
1052
1053                 /* You should not be able to start a local heartbeat
1054                  * on a readonly device. */
1055                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1056                         status = -EROFS;
1057                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1058                              "device.\n");
1059                         goto read_super_error;
1060                 }
1061
1062                 status = ocfs2_check_journals_nolocks(osb);
1063                 if (status < 0) {
1064                         if (status == -EROFS)
1065                                 mlog(ML_ERROR, "Recovery required on readonly "
1066                                      "file system, but write access is "
1067                                      "unavailable.\n");
1068                         else
1069                                 mlog_errno(status);
1070                         goto read_super_error;
1071                 }
1072
1073                 ocfs2_set_ro_flag(osb, 1);
1074
1075                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1076                        "services will be utilized for this mount. Recovery "
1077                        "will be skipped.\n");
1078         }
1079
1080         if (!ocfs2_is_hard_readonly(osb)) {
1081                 if (sb->s_flags & MS_RDONLY)
1082                         ocfs2_set_ro_flag(osb, 0);
1083         }
1084
1085         status = ocfs2_verify_heartbeat(osb);
1086         if (status < 0) {
1087                 mlog_errno(status);
1088                 goto read_super_error;
1089         }
1090
1091         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1092                                                  ocfs2_debugfs_root);
1093         if (!osb->osb_debug_root) {
1094                 status = -EINVAL;
1095                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1096                 goto read_super_error;
1097         }
1098
1099         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1100                                             osb->osb_debug_root,
1101                                             osb,
1102                                             &ocfs2_osb_debug_fops);
1103         if (!osb->osb_ctxt) {
1104                 status = -EINVAL;
1105                 mlog_errno(status);
1106                 goto read_super_error;
1107         }
1108
1109         if (ocfs2_meta_ecc(osb)) {
1110                 status = ocfs2_blockcheck_stats_debugfs_install(
1111                                                 &osb->osb_ecc_stats,
1112                                                 osb->osb_debug_root);
1113                 if (status) {
1114                         mlog(ML_ERROR,
1115                              "Unable to create blockcheck statistics "
1116                              "files\n");
1117                         goto read_super_error;
1118                 }
1119         }
1120
1121         status = ocfs2_mount_volume(sb);
1122         if (osb->root_inode)
1123                 inode = igrab(osb->root_inode);
1124
1125         if (status < 0)
1126                 goto read_super_error;
1127
1128         if (!inode) {
1129                 status = -EIO;
1130                 mlog_errno(status);
1131                 goto read_super_error;
1132         }
1133
1134         root = d_alloc_root(inode);
1135         if (!root) {
1136                 status = -ENOMEM;
1137                 mlog_errno(status);
1138                 goto read_super_error;
1139         }
1140
1141         sb->s_root = root;
1142
1143         ocfs2_complete_mount_recovery(osb);
1144
1145         if (ocfs2_mount_local(osb))
1146                 snprintf(nodestr, sizeof(nodestr), "local");
1147         else
1148                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1149
1150         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1151                "with %s data mode.\n",
1152                osb->dev_str, nodestr, osb->slot_num,
1153                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1154                "ordered");
1155
1156         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1157         wake_up(&osb->osb_mount_event);
1158
1159         /* Now we can initialize quotas because we can afford to wait
1160          * for cluster locks recovery now. That also means that truncation
1161          * log recovery can happen but that waits for proper quota setup */
1162         if (!(sb->s_flags & MS_RDONLY)) {
1163                 status = ocfs2_enable_quotas(osb);
1164                 if (status < 0) {
1165                         /* We have to err-out specially here because
1166                          * s_root is already set */
1167                         mlog_errno(status);
1168                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1169                         wake_up(&osb->osb_mount_event);
1170                         mlog_exit(status);
1171                         return status;
1172                 }
1173         }
1174
1175         ocfs2_complete_quota_recovery(osb);
1176
1177         /* Now we wake up again for processes waiting for quotas */
1178         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1179         wake_up(&osb->osb_mount_event);
1180
1181         /* Start this when the mount is almost sure of being successful */
1182         ocfs2_orphan_scan_start(osb);
1183
1184         mlog_exit(status);
1185         return status;
1186
1187 read_super_error:
1188         brelse(bh);
1189
1190         if (inode)
1191                 iput(inode);
1192
1193         if (osb) {
1194                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1195                 wake_up(&osb->osb_mount_event);
1196                 ocfs2_dismount_volume(sb, 1);
1197         }
1198
1199         mlog_exit(status);
1200         return status;
1201 }
1202
1203 static int ocfs2_get_sb(struct file_system_type *fs_type,
1204                         int flags,
1205                         const char *dev_name,
1206                         void *data,
1207                         struct vfsmount *mnt)
1208 {
1209         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1210                            mnt);
1211 }
1212
1213 static void ocfs2_kill_sb(struct super_block *sb)
1214 {
1215         struct ocfs2_super *osb = OCFS2_SB(sb);
1216
1217         /* Failed mount? */
1218         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1219                 goto out;
1220
1221         /* Prevent further queueing of inode drop events */
1222         spin_lock(&dentry_list_lock);
1223         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1224         spin_unlock(&dentry_list_lock);
1225         /* Wait for work to finish and/or remove it */
1226         cancel_work_sync(&osb->dentry_lock_work);
1227 out:
1228         kill_block_super(sb);
1229 }
1230
1231 static struct file_system_type ocfs2_fs_type = {
1232         .owner          = THIS_MODULE,
1233         .name           = "ocfs2",
1234         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1235                                         * the fs? */
1236         .kill_sb        = ocfs2_kill_sb,
1237
1238         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1239         .next           = NULL
1240 };
1241
1242 static int ocfs2_check_set_options(struct super_block *sb,
1243                                    struct mount_options *options)
1244 {
1245         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1246             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1247                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1248                 mlog(ML_ERROR, "User quotas were requested, but this "
1249                      "filesystem does not have the feature enabled.\n");
1250                 return 0;
1251         }
1252         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1253             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1254                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1255                 mlog(ML_ERROR, "Group quotas were requested, but this "
1256                      "filesystem does not have the feature enabled.\n");
1257                 return 0;
1258         }
1259         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1260             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1261                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1262                      "feature is not enabled\n");
1263                 return 0;
1264         }
1265         /* No ACL setting specified? Use XATTR feature... */
1266         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1267                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1268                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1269                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1270                 else
1271                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1272         }
1273         return 1;
1274 }
1275
1276 static int ocfs2_parse_options(struct super_block *sb,
1277                                char *options,
1278                                struct mount_options *mopt,
1279                                int is_remount)
1280 {
1281         int status;
1282         char *p;
1283
1284         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1285                    options ? options : "(none)");
1286
1287         mopt->commit_interval = 0;
1288         mopt->mount_opt = 0;
1289         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1290         mopt->slot = OCFS2_INVALID_SLOT;
1291         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1292         mopt->cluster_stack[0] = '\0';
1293
1294         if (!options) {
1295                 status = 1;
1296                 goto bail;
1297         }
1298
1299         while ((p = strsep(&options, ",")) != NULL) {
1300                 int token, option;
1301                 substring_t args[MAX_OPT_ARGS];
1302
1303                 if (!*p)
1304                         continue;
1305
1306                 token = match_token(p, tokens, args);
1307                 switch (token) {
1308                 case Opt_hb_local:
1309                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1310                         break;
1311                 case Opt_hb_none:
1312                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1313                         break;
1314                 case Opt_barrier:
1315                         if (match_int(&args[0], &option)) {
1316                                 status = 0;
1317                                 goto bail;
1318                         }
1319                         if (option)
1320                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1321                         else
1322                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1323                         break;
1324                 case Opt_intr:
1325                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1326                         break;
1327                 case Opt_nointr:
1328                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1329                         break;
1330                 case Opt_err_panic:
1331                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1332                         break;
1333                 case Opt_err_ro:
1334                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1335                         break;
1336                 case Opt_data_ordered:
1337                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1338                         break;
1339                 case Opt_data_writeback:
1340                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1341                         break;
1342                 case Opt_user_xattr:
1343                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1344                         break;
1345                 case Opt_nouser_xattr:
1346                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1347                         break;
1348                 case Opt_atime_quantum:
1349                         if (match_int(&args[0], &option)) {
1350                                 status = 0;
1351                                 goto bail;
1352                         }
1353                         if (option >= 0)
1354                                 mopt->atime_quantum = option;
1355                         break;
1356                 case Opt_slot:
1357                         option = 0;
1358                         if (match_int(&args[0], &option)) {
1359                                 status = 0;
1360                                 goto bail;
1361                         }
1362                         if (option)
1363                                 mopt->slot = (s16)option;
1364                         break;
1365                 case Opt_commit:
1366                         option = 0;
1367                         if (match_int(&args[0], &option)) {
1368                                 status = 0;
1369                                 goto bail;
1370                         }
1371                         if (option < 0)
1372                                 return 0;
1373                         if (option == 0)
1374                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1375                         mopt->commit_interval = HZ * option;
1376                         break;
1377                 case Opt_localalloc:
1378                         option = 0;
1379                         if (match_int(&args[0], &option)) {
1380                                 status = 0;
1381                                 goto bail;
1382                         }
1383                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1384                                 mopt->localalloc_opt = option;
1385                         break;
1386                 case Opt_localflocks:
1387                         /*
1388                          * Changing this during remount could race
1389                          * flock() requests, or "unbalance" existing
1390                          * ones (e.g., a lock is taken in one mode but
1391                          * dropped in the other). If users care enough
1392                          * to flip locking modes during remount, we
1393                          * could add a "local" flag to individual
1394                          * flock structures for proper tracking of
1395                          * state.
1396                          */
1397                         if (!is_remount)
1398                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1399                         break;
1400                 case Opt_stack:
1401                         /* Check both that the option we were passed
1402                          * is of the right length and that it is a proper
1403                          * string of the right length.
1404                          */
1405                         if (((args[0].to - args[0].from) !=
1406                              OCFS2_STACK_LABEL_LEN) ||
1407                             (strnlen(args[0].from,
1408                                      OCFS2_STACK_LABEL_LEN) !=
1409                              OCFS2_STACK_LABEL_LEN)) {
1410                                 mlog(ML_ERROR,
1411                                      "Invalid cluster_stack option\n");
1412                                 status = 0;
1413                                 goto bail;
1414                         }
1415                         memcpy(mopt->cluster_stack, args[0].from,
1416                                OCFS2_STACK_LABEL_LEN);
1417                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1418                         break;
1419                 case Opt_inode64:
1420                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1421                         break;
1422                 case Opt_usrquota:
1423                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1424                         break;
1425                 case Opt_grpquota:
1426                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1427                         break;
1428                 case Opt_acl:
1429                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1430                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1431                         break;
1432                 case Opt_noacl:
1433                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1434                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1435                         break;
1436                 default:
1437                         mlog(ML_ERROR,
1438                              "Unrecognized mount option \"%s\" "
1439                              "or missing value\n", p);
1440                         status = 0;
1441                         goto bail;
1442                 }
1443         }
1444
1445         status = 1;
1446
1447 bail:
1448         mlog_exit(status);
1449         return status;
1450 }
1451
1452 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1453 {
1454         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1455         unsigned long opts = osb->s_mount_opt;
1456         unsigned int local_alloc_megs;
1457
1458         if (opts & OCFS2_MOUNT_HB_LOCAL)
1459                 seq_printf(s, ",_netdev,heartbeat=local");
1460         else
1461                 seq_printf(s, ",heartbeat=none");
1462
1463         if (opts & OCFS2_MOUNT_NOINTR)
1464                 seq_printf(s, ",nointr");
1465
1466         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1467                 seq_printf(s, ",data=writeback");
1468         else
1469                 seq_printf(s, ",data=ordered");
1470
1471         if (opts & OCFS2_MOUNT_BARRIER)
1472                 seq_printf(s, ",barrier=1");
1473
1474         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1475                 seq_printf(s, ",errors=panic");
1476         else
1477                 seq_printf(s, ",errors=remount-ro");
1478
1479         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1480                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1481
1482         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1483                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1484
1485         if (osb->osb_commit_interval)
1486                 seq_printf(s, ",commit=%u",
1487                            (unsigned) (osb->osb_commit_interval / HZ));
1488
1489         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1490         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1491                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1492
1493         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1494                 seq_printf(s, ",localflocks,");
1495
1496         if (osb->osb_cluster_stack[0])
1497                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1498                            osb->osb_cluster_stack);
1499         if (opts & OCFS2_MOUNT_USRQUOTA)
1500                 seq_printf(s, ",usrquota");
1501         if (opts & OCFS2_MOUNT_GRPQUOTA)
1502                 seq_printf(s, ",grpquota");
1503
1504         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1505                 seq_printf(s, ",nouser_xattr");
1506         else
1507                 seq_printf(s, ",user_xattr");
1508
1509         if (opts & OCFS2_MOUNT_INODE64)
1510                 seq_printf(s, ",inode64");
1511
1512         if (opts & OCFS2_MOUNT_POSIX_ACL)
1513                 seq_printf(s, ",acl");
1514         else
1515                 seq_printf(s, ",noacl");
1516
1517         return 0;
1518 }
1519
1520 static int __init ocfs2_init(void)
1521 {
1522         int status;
1523
1524         mlog_entry_void();
1525
1526         ocfs2_print_version();
1527
1528         status = init_ocfs2_uptodate_cache();
1529         if (status < 0) {
1530                 mlog_errno(status);
1531                 goto leave;
1532         }
1533
1534         status = ocfs2_initialize_mem_caches();
1535         if (status < 0) {
1536                 mlog_errno(status);
1537                 goto leave;
1538         }
1539
1540         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1541         if (!ocfs2_wq) {
1542                 status = -ENOMEM;
1543                 goto leave;
1544         }
1545
1546         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1547         if (!ocfs2_debugfs_root) {
1548                 status = -EFAULT;
1549                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1550         }
1551
1552         status = ocfs2_quota_setup();
1553         if (status)
1554                 goto leave;
1555
1556         ocfs2_set_locking_protocol();
1557
1558         status = register_quota_format(&ocfs2_quota_format);
1559 leave:
1560         if (status < 0) {
1561                 ocfs2_quota_shutdown();
1562                 ocfs2_free_mem_caches();
1563                 exit_ocfs2_uptodate_cache();
1564         }
1565
1566         mlog_exit(status);
1567
1568         if (status >= 0) {
1569                 return register_filesystem(&ocfs2_fs_type);
1570         } else
1571                 return -1;
1572 }
1573
1574 static void __exit ocfs2_exit(void)
1575 {
1576         mlog_entry_void();
1577
1578         ocfs2_quota_shutdown();
1579
1580         if (ocfs2_wq) {
1581                 flush_workqueue(ocfs2_wq);
1582                 destroy_workqueue(ocfs2_wq);
1583         }
1584
1585         unregister_quota_format(&ocfs2_quota_format);
1586
1587         debugfs_remove(ocfs2_debugfs_root);
1588
1589         ocfs2_free_mem_caches();
1590
1591         unregister_filesystem(&ocfs2_fs_type);
1592
1593         exit_ocfs2_uptodate_cache();
1594
1595         mlog_exit_void();
1596 }
1597
1598 static void ocfs2_put_super(struct super_block *sb)
1599 {
1600         mlog_entry("(0x%p)\n", sb);
1601
1602         lock_kernel();
1603
1604         ocfs2_sync_blockdev(sb);
1605         ocfs2_dismount_volume(sb, 0);
1606
1607         unlock_kernel();
1608
1609         mlog_exit_void();
1610 }
1611
1612 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1613 {
1614         struct ocfs2_super *osb;
1615         u32 numbits, freebits;
1616         int status;
1617         struct ocfs2_dinode *bm_lock;
1618         struct buffer_head *bh = NULL;
1619         struct inode *inode = NULL;
1620
1621         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1622
1623         osb = OCFS2_SB(dentry->d_sb);
1624
1625         inode = ocfs2_get_system_file_inode(osb,
1626                                             GLOBAL_BITMAP_SYSTEM_INODE,
1627                                             OCFS2_INVALID_SLOT);
1628         if (!inode) {
1629                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1630                 status = -EIO;
1631                 goto bail;
1632         }
1633
1634         status = ocfs2_inode_lock(inode, &bh, 0);
1635         if (status < 0) {
1636                 mlog_errno(status);
1637                 goto bail;
1638         }
1639
1640         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1641
1642         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1643         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1644
1645         buf->f_type = OCFS2_SUPER_MAGIC;
1646         buf->f_bsize = dentry->d_sb->s_blocksize;
1647         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1648         buf->f_blocks = ((sector_t) numbits) *
1649                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1650         buf->f_bfree = ((sector_t) freebits) *
1651                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1652         buf->f_bavail = buf->f_bfree;
1653         buf->f_files = numbits;
1654         buf->f_ffree = freebits;
1655         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1656                                 & 0xFFFFFFFFUL;
1657         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1658                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1659
1660         brelse(bh);
1661
1662         ocfs2_inode_unlock(inode, 0);
1663         status = 0;
1664 bail:
1665         if (inode)
1666                 iput(inode);
1667
1668         mlog_exit(status);
1669
1670         return status;
1671 }
1672
1673 static void ocfs2_inode_init_once(void *data)
1674 {
1675         struct ocfs2_inode_info *oi = data;
1676
1677         oi->ip_flags = 0;
1678         oi->ip_open_count = 0;
1679         spin_lock_init(&oi->ip_lock);
1680         ocfs2_extent_map_init(&oi->vfs_inode);
1681         INIT_LIST_HEAD(&oi->ip_io_markers);
1682         oi->ip_dir_start_lookup = 0;
1683
1684         init_rwsem(&oi->ip_alloc_sem);
1685         init_rwsem(&oi->ip_xattr_sem);
1686         mutex_init(&oi->ip_io_mutex);
1687
1688         oi->ip_blkno = 0ULL;
1689         oi->ip_clusters = 0;
1690
1691         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1692         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1693         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1694
1695         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1696                                   &ocfs2_inode_caching_ops);
1697
1698         inode_init_once(&oi->vfs_inode);
1699 }
1700
1701 static int ocfs2_initialize_mem_caches(void)
1702 {
1703         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1704                                        sizeof(struct ocfs2_inode_info),
1705                                        0,
1706                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1707                                                 SLAB_MEM_SPREAD),
1708                                        ocfs2_inode_init_once);
1709         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1710                                         sizeof(struct ocfs2_dquot),
1711                                         0,
1712                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1713                                                 SLAB_MEM_SPREAD),
1714                                         NULL);
1715         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1716                                         sizeof(struct ocfs2_quota_chunk),
1717                                         0,
1718                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1719                                         NULL);
1720         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1721             !ocfs2_qf_chunk_cachep) {
1722                 if (ocfs2_inode_cachep)
1723                         kmem_cache_destroy(ocfs2_inode_cachep);
1724                 if (ocfs2_dquot_cachep)
1725                         kmem_cache_destroy(ocfs2_dquot_cachep);
1726                 if (ocfs2_qf_chunk_cachep)
1727                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1728                 return -ENOMEM;
1729         }
1730
1731         return 0;
1732 }
1733
1734 static void ocfs2_free_mem_caches(void)
1735 {
1736         if (ocfs2_inode_cachep)
1737                 kmem_cache_destroy(ocfs2_inode_cachep);
1738         ocfs2_inode_cachep = NULL;
1739
1740         if (ocfs2_dquot_cachep)
1741                 kmem_cache_destroy(ocfs2_dquot_cachep);
1742         ocfs2_dquot_cachep = NULL;
1743
1744         if (ocfs2_qf_chunk_cachep)
1745                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1746         ocfs2_qf_chunk_cachep = NULL;
1747 }
1748
1749 static int ocfs2_get_sector(struct super_block *sb,
1750                             struct buffer_head **bh,
1751                             int block,
1752                             int sect_size)
1753 {
1754         if (!sb_set_blocksize(sb, sect_size)) {
1755                 mlog(ML_ERROR, "unable to set blocksize\n");
1756                 return -EIO;
1757         }
1758
1759         *bh = sb_getblk(sb, block);
1760         if (!*bh) {
1761                 mlog_errno(-EIO);
1762                 return -EIO;
1763         }
1764         lock_buffer(*bh);
1765         if (!buffer_dirty(*bh))
1766                 clear_buffer_uptodate(*bh);
1767         unlock_buffer(*bh);
1768         ll_rw_block(READ, 1, bh);
1769         wait_on_buffer(*bh);
1770         if (!buffer_uptodate(*bh)) {
1771                 mlog_errno(-EIO);
1772                 brelse(*bh);
1773                 *bh = NULL;
1774                 return -EIO;
1775         }
1776
1777         return 0;
1778 }
1779
1780 static int ocfs2_mount_volume(struct super_block *sb)
1781 {
1782         int status = 0;
1783         int unlock_super = 0;
1784         struct ocfs2_super *osb = OCFS2_SB(sb);
1785
1786         mlog_entry_void();
1787
1788         if (ocfs2_is_hard_readonly(osb))
1789                 goto leave;
1790
1791         status = ocfs2_dlm_init(osb);
1792         if (status < 0) {
1793                 mlog_errno(status);
1794                 goto leave;
1795         }
1796
1797         status = ocfs2_super_lock(osb, 1);
1798         if (status < 0) {
1799                 mlog_errno(status);
1800                 goto leave;
1801         }
1802         unlock_super = 1;
1803
1804         /* This will load up the node map and add ourselves to it. */
1805         status = ocfs2_find_slot(osb);
1806         if (status < 0) {
1807                 mlog_errno(status);
1808                 goto leave;
1809         }
1810
1811         /* load all node-local system inodes */
1812         status = ocfs2_init_local_system_inodes(osb);
1813         if (status < 0) {
1814                 mlog_errno(status);
1815                 goto leave;
1816         }
1817
1818         status = ocfs2_check_volume(osb);
1819         if (status < 0) {
1820                 mlog_errno(status);
1821                 goto leave;
1822         }
1823
1824         status = ocfs2_truncate_log_init(osb);
1825         if (status < 0)
1826                 mlog_errno(status);
1827
1828 leave:
1829         if (unlock_super)
1830                 ocfs2_super_unlock(osb, 1);
1831
1832         mlog_exit(status);
1833         return status;
1834 }
1835
1836 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1837 {
1838         int tmp, hangup_needed = 0;
1839         struct ocfs2_super *osb = NULL;
1840         char nodestr[8];
1841
1842         mlog_entry("(0x%p)\n", sb);
1843
1844         BUG_ON(!sb);
1845         osb = OCFS2_SB(sb);
1846         BUG_ON(!osb);
1847
1848         debugfs_remove(osb->osb_ctxt);
1849
1850         /*
1851          * Flush inode dropping work queue so that deletes are
1852          * performed while the filesystem is still working
1853          */
1854         ocfs2_drop_all_dl_inodes(osb);
1855
1856         /* Orphan scan should be stopped as early as possible */
1857         ocfs2_orphan_scan_stop(osb);
1858
1859         ocfs2_disable_quotas(osb);
1860
1861         ocfs2_shutdown_local_alloc(osb);
1862
1863         ocfs2_truncate_log_shutdown(osb);
1864
1865         /* This will disable recovery and flush any recovery work. */
1866         ocfs2_recovery_exit(osb);
1867
1868         ocfs2_journal_shutdown(osb);
1869
1870         ocfs2_sync_blockdev(sb);
1871
1872         ocfs2_purge_refcount_trees(osb);
1873
1874         /* No cluster connection means we've failed during mount, so skip
1875          * all the steps which depended on that to complete. */
1876         if (osb->cconn) {
1877                 tmp = ocfs2_super_lock(osb, 1);
1878                 if (tmp < 0) {
1879                         mlog_errno(tmp);
1880                         return;
1881                 }
1882         }
1883
1884         if (osb->slot_num != OCFS2_INVALID_SLOT)
1885                 ocfs2_put_slot(osb);
1886
1887         if (osb->cconn)
1888                 ocfs2_super_unlock(osb, 1);
1889
1890         ocfs2_release_system_inodes(osb);
1891
1892         /*
1893          * If we're dismounting due to mount error, mount.ocfs2 will clean
1894          * up heartbeat.  If we're a local mount, there is no heartbeat.
1895          * If we failed before we got a uuid_str yet, we can't stop
1896          * heartbeat.  Otherwise, do it.
1897          */
1898         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1899                 hangup_needed = 1;
1900
1901         if (osb->cconn)
1902                 ocfs2_dlm_shutdown(osb, hangup_needed);
1903
1904         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1905         debugfs_remove(osb->osb_debug_root);
1906
1907         if (hangup_needed)
1908                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1909
1910         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1911
1912         if (ocfs2_mount_local(osb))
1913                 snprintf(nodestr, sizeof(nodestr), "local");
1914         else
1915                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1916
1917         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1918                osb->dev_str, nodestr);
1919
1920         ocfs2_delete_osb(osb);
1921         kfree(osb);
1922         sb->s_dev = 0;
1923         sb->s_fs_info = NULL;
1924 }
1925
1926 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1927                                 unsigned uuid_bytes)
1928 {
1929         int i, ret;
1930         char *ptr;
1931
1932         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1933
1934         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1935         if (osb->uuid_str == NULL)
1936                 return -ENOMEM;
1937
1938         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1939                 /* print with null */
1940                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1941                 if (ret != 2) /* drop super cleans up */
1942                         return -EINVAL;
1943                 /* then only advance past the last char */
1944                 ptr += 2;
1945         }
1946
1947         return 0;
1948 }
1949
1950 static int ocfs2_initialize_super(struct super_block *sb,
1951                                   struct buffer_head *bh,
1952                                   int sector_size,
1953                                   struct ocfs2_blockcheck_stats *stats)
1954 {
1955         int status;
1956         int i, cbits, bbits;
1957         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1958         struct inode *inode = NULL;
1959         struct ocfs2_journal *journal;
1960         __le32 uuid_net_key;
1961         struct ocfs2_super *osb;
1962
1963         mlog_entry_void();
1964
1965         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1966         if (!osb) {
1967                 status = -ENOMEM;
1968                 mlog_errno(status);
1969                 goto bail;
1970         }
1971
1972         sb->s_fs_info = osb;
1973         sb->s_op = &ocfs2_sops;
1974         sb->s_export_op = &ocfs2_export_ops;
1975         sb->s_qcop = &ocfs2_quotactl_ops;
1976         sb->dq_op = &ocfs2_quota_operations;
1977         sb->s_xattr = ocfs2_xattr_handlers;
1978         sb->s_time_gran = 1;
1979         sb->s_flags |= MS_NOATIME;
1980         /* this is needed to support O_LARGEFILE */
1981         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1982         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1983         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1984
1985         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1986
1987         for (i = 0; i < 3; i++)
1988                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1989         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1990
1991         osb->sb = sb;
1992         /* Save off for ocfs2_rw_direct */
1993         osb->s_sectsize_bits = blksize_bits(sector_size);
1994         BUG_ON(!osb->s_sectsize_bits);
1995
1996         spin_lock_init(&osb->dc_task_lock);
1997         init_waitqueue_head(&osb->dc_event);
1998         osb->dc_work_sequence = 0;
1999         osb->dc_wake_sequence = 0;
2000         INIT_LIST_HEAD(&osb->blocked_lock_list);
2001         osb->blocked_lock_count = 0;
2002         spin_lock_init(&osb->osb_lock);
2003         spin_lock_init(&osb->osb_xattr_lock);
2004         ocfs2_init_steal_slots(osb);
2005
2006         atomic_set(&osb->alloc_stats.moves, 0);
2007         atomic_set(&osb->alloc_stats.local_data, 0);
2008         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2009         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2010         atomic_set(&osb->alloc_stats.bg_extends, 0);
2011
2012         /* Copy the blockcheck stats from the superblock probe */
2013         osb->osb_ecc_stats = *stats;
2014
2015         ocfs2_init_node_maps(osb);
2016
2017         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2018                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2019
2020         ocfs2_orphan_scan_init(osb);
2021
2022         status = ocfs2_recovery_init(osb);
2023         if (status) {
2024                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2025                 mlog_errno(status);
2026                 goto bail;
2027         }
2028
2029         init_waitqueue_head(&osb->checkpoint_event);
2030         atomic_set(&osb->needs_checkpoint, 0);
2031
2032         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2033
2034         osb->slot_num = OCFS2_INVALID_SLOT;
2035
2036         osb->s_xattr_inline_size = le16_to_cpu(
2037                                         di->id2.i_super.s_xattr_inline_size);
2038
2039         osb->local_alloc_state = OCFS2_LA_UNUSED;
2040         osb->local_alloc_bh = NULL;
2041         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2042
2043         init_waitqueue_head(&osb->osb_mount_event);
2044
2045         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2046         if (!osb->vol_label) {
2047                 mlog(ML_ERROR, "unable to alloc vol label\n");
2048                 status = -ENOMEM;
2049                 goto bail;
2050         }
2051
2052         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2053         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2054                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2055                      osb->max_slots);
2056                 status = -EINVAL;
2057                 goto bail;
2058         }
2059         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2060
2061         osb->slot_recovery_generations =
2062                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2063                         GFP_KERNEL);
2064         if (!osb->slot_recovery_generations) {
2065                 status = -ENOMEM;
2066                 mlog_errno(status);
2067                 goto bail;
2068         }
2069
2070         init_waitqueue_head(&osb->osb_wipe_event);
2071         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2072                                         sizeof(*osb->osb_orphan_wipes),
2073                                         GFP_KERNEL);
2074         if (!osb->osb_orphan_wipes) {
2075                 status = -ENOMEM;
2076                 mlog_errno(status);
2077                 goto bail;
2078         }
2079
2080         osb->osb_rf_lock_tree = RB_ROOT;
2081
2082         osb->s_feature_compat =
2083                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2084         osb->s_feature_ro_compat =
2085                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2086         osb->s_feature_incompat =
2087                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2088
2089         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2090                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2091                      "optional features (%x).\n", i);
2092                 status = -EINVAL;
2093                 goto bail;
2094         }
2095         if (!(osb->sb->s_flags & MS_RDONLY) &&
2096             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2097                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2098                      "unsupported optional features (%x).\n", i);
2099                 status = -EINVAL;
2100                 goto bail;
2101         }
2102
2103         if (ocfs2_userspace_stack(osb)) {
2104                 memcpy(osb->osb_cluster_stack,
2105                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2106                        OCFS2_STACK_LABEL_LEN);
2107                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2108                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2109                         mlog(ML_ERROR,
2110                              "couldn't mount because of an invalid "
2111                              "cluster stack label (%s) \n",
2112                              osb->osb_cluster_stack);
2113                         status = -EINVAL;
2114                         goto bail;
2115                 }
2116         } else {
2117                 /* The empty string is identical with classic tools that
2118                  * don't know about s_cluster_info. */
2119                 osb->osb_cluster_stack[0] = '\0';
2120         }
2121
2122         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2123
2124         /* FIXME
2125          * This should be done in ocfs2_journal_init(), but unknown
2126          * ordering issues will cause the filesystem to crash.
2127          * If anyone wants to figure out what part of the code
2128          * refers to osb->journal before ocfs2_journal_init() is run,
2129          * be my guest.
2130          */
2131         /* initialize our journal structure */
2132
2133         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2134         if (!journal) {
2135                 mlog(ML_ERROR, "unable to alloc journal\n");
2136                 status = -ENOMEM;
2137                 goto bail;
2138         }
2139         osb->journal = journal;
2140         journal->j_osb = osb;
2141
2142         atomic_set(&journal->j_num_trans, 0);
2143         init_rwsem(&journal->j_trans_barrier);
2144         init_waitqueue_head(&journal->j_checkpointed);
2145         spin_lock_init(&journal->j_lock);
2146         journal->j_trans_id = (unsigned long) 1;
2147         INIT_LIST_HEAD(&journal->j_la_cleanups);
2148         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2149         journal->j_state = OCFS2_JOURNAL_FREE;
2150
2151         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2152         osb->dentry_lock_list = NULL;
2153
2154         /* get some pseudo constants for clustersize bits */
2155         osb->s_clustersize_bits =
2156                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2157         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2158         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2159
2160         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2161             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2162                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2163                      osb->s_clustersize);
2164                 status = -EINVAL;
2165                 goto bail;
2166         }
2167
2168         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2169             > (u32)~0UL) {
2170                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2171                      "what jbd can address in 32 bits.\n");
2172                 status = -EINVAL;
2173                 goto bail;
2174         }
2175
2176         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2177                                  sizeof(di->id2.i_super.s_uuid))) {
2178                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2179                 status = -ENOMEM;
2180                 goto bail;
2181         }
2182
2183         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2184
2185         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2186         osb->vol_label[63] = '\0';
2187         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2188         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2189         osb->first_cluster_group_blkno =
2190                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2191         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2192         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2193         mlog(0, "vol_label: %s\n", osb->vol_label);
2194         mlog(0, "uuid: %s\n", osb->uuid_str);
2195         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2196              (unsigned long long)osb->root_blkno,
2197              (unsigned long long)osb->system_dir_blkno);
2198
2199         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2200         if (!osb->osb_dlm_debug) {
2201                 status = -ENOMEM;
2202                 mlog_errno(status);
2203                 goto bail;
2204         }
2205
2206         atomic_set(&osb->vol_state, VOLUME_INIT);
2207
2208         /* load root, system_dir, and all global system inodes */
2209         status = ocfs2_init_global_system_inodes(osb);
2210         if (status < 0) {
2211                 mlog_errno(status);
2212                 goto bail;
2213         }
2214
2215         /*
2216          * global bitmap
2217          */
2218         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2219                                             OCFS2_INVALID_SLOT);
2220         if (!inode) {
2221                 status = -EINVAL;
2222                 mlog_errno(status);
2223                 goto bail;
2224         }
2225
2226         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2227         iput(inode);
2228
2229         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2230
2231         status = ocfs2_init_slot_info(osb);
2232         if (status < 0) {
2233                 mlog_errno(status);
2234                 goto bail;
2235         }
2236
2237 bail:
2238         mlog_exit(status);
2239         return status;
2240 }
2241
2242 /*
2243  * will return: -EAGAIN if it is ok to keep searching for superblocks
2244  *              -EINVAL if there is a bad superblock
2245  *              0 on success
2246  */
2247 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2248                                struct buffer_head *bh,
2249                                u32 blksz,
2250                                struct ocfs2_blockcheck_stats *stats)
2251 {
2252         int status = -EAGAIN;
2253
2254         mlog_entry_void();
2255
2256         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2257                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2258                 /* We have to do a raw check of the feature here */
2259                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2260                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2261                         status = ocfs2_block_check_validate(bh->b_data,
2262                                                             bh->b_size,
2263                                                             &di->i_check,
2264                                                             stats);
2265                         if (status)
2266                                 goto out;
2267                 }
2268                 status = -EINVAL;
2269                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2270                         mlog(ML_ERROR, "found superblock with incorrect block "
2271                              "size: found %u, should be %u\n",
2272                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2273                                blksz);
2274                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2275                            OCFS2_MAJOR_REV_LEVEL ||
2276                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2277                            OCFS2_MINOR_REV_LEVEL) {
2278                         mlog(ML_ERROR, "found superblock with bad version: "
2279                              "found %u.%u, should be %u.%u\n",
2280                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2281                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2282                              OCFS2_MAJOR_REV_LEVEL,
2283                              OCFS2_MINOR_REV_LEVEL);
2284                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2285                         mlog(ML_ERROR, "bad block number on superblock: "
2286                              "found %llu, should be %llu\n",
2287                              (unsigned long long)le64_to_cpu(di->i_blkno),
2288                              (unsigned long long)bh->b_blocknr);
2289                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2290                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2291                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2292                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2293                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2294                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2295                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2296                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2297                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2298                         mlog(ML_ERROR,
2299                              "Superblock slots found greater than file system "
2300                              "maximum: found %u, max %u\n",
2301                              le16_to_cpu(di->id2.i_super.s_max_slots),
2302                              OCFS2_MAX_SLOTS);
2303                 } else {
2304                         /* found it! */
2305                         status = 0;
2306                 }
2307         }
2308
2309 out:
2310         mlog_exit(status);
2311         return status;
2312 }
2313
2314 static int ocfs2_check_volume(struct ocfs2_super *osb)
2315 {
2316         int status;
2317         int dirty;
2318         int local;
2319         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2320                                                   * recover
2321                                                   * ourselves. */
2322
2323         mlog_entry_void();
2324
2325         /* Init our journal object. */
2326         status = ocfs2_journal_init(osb->journal, &dirty);
2327         if (status < 0) {
2328                 mlog(ML_ERROR, "Could not initialize journal!\n");
2329                 goto finally;
2330         }
2331
2332         /* If the journal was unmounted cleanly then we don't want to
2333          * recover anything. Otherwise, journal_load will do that
2334          * dirty work for us :) */
2335         if (!dirty) {
2336                 status = ocfs2_journal_wipe(osb->journal, 0);
2337                 if (status < 0) {
2338                         mlog_errno(status);
2339                         goto finally;
2340                 }
2341         } else {
2342                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2343                      "recovering volume.\n");
2344         }
2345
2346         local = ocfs2_mount_local(osb);
2347
2348         /* will play back anything left in the journal. */
2349         status = ocfs2_journal_load(osb->journal, local, dirty);
2350         if (status < 0) {
2351                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2352                 goto finally;
2353         }
2354
2355         if (dirty) {
2356                 /* recover my local alloc if we didn't unmount cleanly. */
2357                 status = ocfs2_begin_local_alloc_recovery(osb,
2358                                                           osb->slot_num,
2359                                                           &local_alloc);
2360                 if (status < 0) {
2361                         mlog_errno(status);
2362                         goto finally;
2363                 }
2364                 /* we complete the recovery process after we've marked
2365                  * ourselves as mounted. */
2366         }
2367
2368         mlog(0, "Journal loaded.\n");
2369
2370         status = ocfs2_load_local_alloc(osb);
2371         if (status < 0) {
2372                 mlog_errno(status);
2373                 goto finally;
2374         }
2375
2376         if (dirty) {
2377                 /* Recovery will be completed after we've mounted the
2378                  * rest of the volume. */
2379                 osb->dirty = 1;
2380                 osb->local_alloc_copy = local_alloc;
2381                 local_alloc = NULL;
2382         }
2383
2384         /* go through each journal, trylock it and if you get the
2385          * lock, and it's marked as dirty, set the bit in the recover
2386          * map and launch a recovery thread for it. */
2387         status = ocfs2_mark_dead_nodes(osb);
2388         if (status < 0) {
2389                 mlog_errno(status);
2390                 goto finally;
2391         }
2392
2393         status = ocfs2_compute_replay_slots(osb);
2394         if (status < 0)
2395                 mlog_errno(status);
2396
2397 finally:
2398         if (local_alloc)
2399                 kfree(local_alloc);
2400
2401         mlog_exit(status);
2402         return status;
2403 }
2404
2405 /*
2406  * The routine gets called from dismount or close whenever a dismount on
2407  * volume is requested and the osb open count becomes 1.
2408  * It will remove the osb from the global list and also free up all the
2409  * initialized resources and fileobject.
2410  */
2411 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2412 {
2413         mlog_entry_void();
2414
2415         /* This function assumes that the caller has the main osb resource */
2416
2417         ocfs2_free_slot_info(osb);
2418
2419         kfree(osb->osb_orphan_wipes);
2420         kfree(osb->slot_recovery_generations);
2421         /* FIXME
2422          * This belongs in journal shutdown, but because we have to
2423          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2424          * we free it here.
2425          */
2426         kfree(osb->journal);
2427         if (osb->local_alloc_copy)
2428                 kfree(osb->local_alloc_copy);
2429         kfree(osb->uuid_str);
2430         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2431         memset(osb, 0, sizeof(struct ocfs2_super));
2432
2433         mlog_exit_void();
2434 }
2435
2436 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2437  * panic(). We do not support continue-on-error operation. */
2438 static void ocfs2_handle_error(struct super_block *sb)
2439 {
2440         struct ocfs2_super *osb = OCFS2_SB(sb);
2441
2442         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2443                 panic("OCFS2: (device %s): panic forced after error\n",
2444                       sb->s_id);
2445
2446         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2447
2448         if (sb->s_flags & MS_RDONLY &&
2449             (ocfs2_is_soft_readonly(osb) ||
2450              ocfs2_is_hard_readonly(osb)))
2451                 return;
2452
2453         printk(KERN_CRIT "File system is now read-only due to the potential "
2454                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2455                "system is unmounted.\n");
2456         sb->s_flags |= MS_RDONLY;
2457         ocfs2_set_ro_flag(osb, 0);
2458 }
2459
2460 static char error_buf[1024];
2461
2462 void __ocfs2_error(struct super_block *sb,
2463                    const char *function,
2464                    const char *fmt, ...)
2465 {
2466         va_list args;
2467
2468         va_start(args, fmt);
2469         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2470         va_end(args);
2471
2472         /* Not using mlog here because we want to show the actual
2473          * function the error came from. */
2474         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2475                sb->s_id, function, error_buf);
2476
2477         ocfs2_handle_error(sb);
2478 }
2479
2480 /* Handle critical errors. This is intentionally more drastic than
2481  * ocfs2_handle_error, so we only use for things like journal errors,
2482  * etc. */
2483 void __ocfs2_abort(struct super_block* sb,
2484                    const char *function,
2485                    const char *fmt, ...)
2486 {
2487         va_list args;
2488
2489         va_start(args, fmt);
2490         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2491         va_end(args);
2492
2493         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2494                sb->s_id, function, error_buf);
2495
2496         /* We don't have the cluster support yet to go straight to
2497          * hard readonly in here. Until then, we want to keep
2498          * ocfs2_abort() so that we can at least mark critical
2499          * errors.
2500          *
2501          * TODO: This should abort the journal and alert other nodes
2502          * that our slot needs recovery. */
2503
2504         /* Force a panic(). This stinks, but it's better than letting
2505          * things continue without having a proper hard readonly
2506          * here. */
2507         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2508                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2509         ocfs2_handle_error(sb);
2510 }
2511
2512 module_init(ocfs2_init);
2513 module_exit(ocfs2_exit);