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   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/init.h>
  32 #include <linux/random.h>
  33 #include <linux/statfs.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/socket.h>
  37 #include <linux/inet.h>
  38 #include <linux/parser.h>
  39 #include <linux/crc32.h>
  40 #include <linux/debugfs.h>
  41 #include <linux/mount.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/quotaops.h>
  44 #include <linux/smp_lock.h>
  45
  46 #define MLOG_MASK_PREFIX ML_SUPER
  47 #include <cluster/masklog.h>
  48
  49 #include "ocfs2.h"
  50
  51 /* this should be the only file to include a version 1 header */
  52 #include "ocfs1_fs_compat.h"
  53
  54 #include "alloc.h"
  55 #include "blockcheck.h"
  56 #include "dlmglue.h"
  57 #include "export.h"
  58 #include "extent_map.h"
  59 #include "heartbeat.h"
  60 #include "inode.h"
  61 #include "journal.h"
  62 #include "localalloc.h"
  63 #include "namei.h"
  64 #include "slot_map.h"
  65 #include "super.h"
  66 #include "sysfile.h"
  67 #include "uptodate.h"
  68 #include "ver.h"
  69 #include "xattr.h"
  70 #include "quota.h"
  71 #include "refcounttree.h"
  72
  73 #include "buffer_head_io.h"
  74
  75 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  76 struct kmem_cache *ocfs2_dquot_cachep;
  77 struct kmem_cache *ocfs2_qf_chunk_cachep;
  78
  79 /* OCFS2 needs to schedule several differnt types of work which
  80  * require cluster locking, disk I/O, recovery waits, etc. Since these
  81  * types of work tend to be heavy we avoid using the kernel events
  82  * workqueue and schedule on our own. */
  83 struct workqueue_struct *ocfs2_wq = NULL;
  84
  85 static struct dentry *ocfs2_debugfs_root = NULL;
  86
  87 MODULE_AUTHOR("Oracle");
  88 MODULE_LICENSE("GPL");
  89
  90 struct mount_options
  91 {
  92         unsigned long   commit_interval;
  93         unsigned long   mount_opt;
  94         unsigned int    atime_quantum;
  95         signed short    slot;
  96         unsigned int    localalloc_opt;
  97         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  98 };
  99
 100 static int ocfs2_parse_options(struct super_block *sb, char *options,
 101                                struct mount_options *mopt,
 102                                int is_remount);
 103 static int ocfs2_check_set_options(struct super_block *sb,
 104                                    struct mount_options *options);
 105 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 106 static void ocfs2_put_super(struct super_block *sb);
 107 static int ocfs2_mount_volume(struct super_block *sb);
 108 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 109 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 110 static int ocfs2_initialize_mem_caches(void);
 111 static void ocfs2_free_mem_caches(void);
 112 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 113
 114 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 115
 116 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 117
 118 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 119 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 120 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 121 static int ocfs2_check_volume(struct ocfs2_super *osb);
 122 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 123                                struct buffer_head *bh,
 124                                u32 sectsize,
 125                                struct ocfs2_blockcheck_stats *stats);
 126 static int ocfs2_initialize_super(struct super_block *sb,
 127                                   struct buffer_head *bh,
 128                                   int sector_size,
 129                                   struct ocfs2_blockcheck_stats *stats);
 130 static int ocfs2_get_sector(struct super_block *sb,
 131                             struct buffer_head **bh,
 132                             int block,
 133                             int sect_size);
 134 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 135 static void ocfs2_destroy_inode(struct inode *inode);
 136 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 137 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 138 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 139
 140 static const struct super_operations ocfs2_sops = {
 141         .statfs         = ocfs2_statfs,
 142         .alloc_inode    = ocfs2_alloc_inode,
 143         .destroy_inode  = ocfs2_destroy_inode,
 144         .drop_inode     = ocfs2_drop_inode,
 145         .clear_inode    = ocfs2_clear_inode,
 146         .delete_inode   = ocfs2_delete_inode,
 147         .sync_fs        = ocfs2_sync_fs,
 148         .put_super      = ocfs2_put_super,
 149         .remount_fs     = ocfs2_remount,
 150         .show_options   = ocfs2_show_options,
 151         .quota_read     = ocfs2_quota_read,
 152         .quota_write    = ocfs2_quota_write,
 153 };
 154
 155 enum {
 156         Opt_barrier,
 157         Opt_err_panic,
 158         Opt_err_ro,
 159         Opt_intr,
 160         Opt_nointr,
 161         Opt_hb_none,
 162         Opt_hb_local,
 163         Opt_data_ordered,
 164         Opt_data_writeback,
 165         Opt_atime_quantum,
 166         Opt_slot,
 167         Opt_commit,
 168         Opt_localalloc,
 169         Opt_localflocks,
 170         Opt_stack,
 171         Opt_user_xattr,
 172         Opt_nouser_xattr,
 173         Opt_inode64,
 174         Opt_acl,
 175         Opt_noacl,
 176         Opt_usrquota,
 177         Opt_grpquota,
 178         Opt_err,
 179 };
 180
 181 static const match_table_t tokens = {
 182         {Opt_barrier, "barrier=%u"},
 183         {Opt_err_panic, "errors=panic"},
 184         {Opt_err_ro, "errors=remount-ro"},
 185         {Opt_intr, "intr"},
 186         {Opt_nointr, "nointr"},
 187         {Opt_hb_none, OCFS2_HB_NONE},
 188         {Opt_hb_local, OCFS2_HB_LOCAL},
 189         {Opt_data_ordered, "data=ordered"},
 190         {Opt_data_writeback, "data=writeback"},
 191         {Opt_atime_quantum, "atime_quantum=%u"},
 192         {Opt_slot, "preferred_slot=%u"},
 193         {Opt_commit, "commit=%u"},
 194         {Opt_localalloc, "localalloc=%d"},
 195         {Opt_localflocks, "localflocks"},
 196         {Opt_stack, "cluster_stack=%s"},
 197         {Opt_user_xattr, "user_xattr"},
 198         {Opt_nouser_xattr, "nouser_xattr"},
 199         {Opt_inode64, "inode64"},
 200         {Opt_acl, "acl"},
 201         {Opt_noacl, "noacl"},
 202         {Opt_usrquota, "usrquota"},
 203         {Opt_grpquota, "grpquota"},
 204         {Opt_err, NULL}
 205 };
 206
 207 #ifdef CONFIG_DEBUG_FS
 208 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 209 {
 210         struct ocfs2_cluster_connection *cconn = osb->cconn;
 211         struct ocfs2_recovery_map *rm = osb->recovery_map;
 212         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 213         int i, out = 0;
 214
 215         out += snprintf(buf + out, len - out,
 216                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 217                         "Device", osb->dev_str, osb->uuid_str,
 218                         osb->fs_generation, osb->vol_label);
 219
 220         out += snprintf(buf + out, len - out,
 221                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 222                         atomic_read(&osb->vol_state), osb->osb_flags);
 223
 224         out += snprintf(buf + out, len - out,
 225                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 226                         osb->sb->s_blocksize, osb->s_clustersize);
 227
 228         out += snprintf(buf + out, len - out,
 229                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 230                         "ROcompat: 0x%X\n",
 231                         "Features", osb->s_feature_compat,
 232                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 233
 234         out += snprintf(buf + out, len - out,
 235                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 236                         osb->s_mount_opt, osb->s_atime_quantum);
 237
 238         if (cconn) {
 239                 out += snprintf(buf + out, len - out,
 240                                 "%10s => Stack: %s  Name: %*s  "
 241                                 "Version: %d.%d\n", "Cluster",
 242                                 (*osb->osb_cluster_stack == '\0' ?
 243                                  "o2cb" : osb->osb_cluster_stack),
 244                                 cconn->cc_namelen, cconn->cc_name,
 245                                 cconn->cc_version.pv_major,
 246                                 cconn->cc_version.pv_minor);
 247         }
 248
 249         spin_lock(&osb->dc_task_lock);
 250         out += snprintf(buf + out, len - out,
 251                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 252                         "WorkSeq: %lu\n", "DownCnvt",
 253                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 254                         osb->blocked_lock_count, osb->dc_wake_sequence,
 255                         osb->dc_work_sequence);
 256         spin_unlock(&osb->dc_task_lock);
 257
 258         spin_lock(&osb->osb_lock);
 259         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 260                         "Recovery",
 261                         (osb->recovery_thread_task ?
 262                          task_pid_nr(osb->recovery_thread_task) : -1));
 263         if (rm->rm_used == 0)
 264                 out += snprintf(buf + out, len - out, " None\n");
 265         else {
 266                 for (i = 0; i < rm->rm_used; i++)
 267                         out += snprintf(buf + out, len - out, " %d",
 268                                         rm->rm_entries[i]);
 269                 out += snprintf(buf + out, len - out, "\n");
 270         }
 271         spin_unlock(&osb->osb_lock);
 272
 273         out += snprintf(buf + out, len - out,
 274                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 275                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 276                         osb->osb_commit_interval,
 277                         atomic_read(&osb->needs_checkpoint));
 278
 279         out += snprintf(buf + out, len - out,
 280                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 281                         "Journal", osb->journal->j_state,
 282                         osb->journal->j_trans_id,
 283                         atomic_read(&osb->journal->j_num_trans));
 284
 285         out += snprintf(buf + out, len - out,
 286                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 287                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 288                         "Stats",
 289                         atomic_read(&osb->alloc_stats.bitmap_data),
 290                         atomic_read(&osb->alloc_stats.local_data),
 291                         atomic_read(&osb->alloc_stats.bg_allocs),
 292                         atomic_read(&osb->alloc_stats.moves),
 293                         atomic_read(&osb->alloc_stats.bg_extends));
 294
 295         out += snprintf(buf + out, len - out,
 296                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 297                         "Default: %u bits\n",
 298                         "LocalAlloc", osb->local_alloc_state,
 299                         (unsigned long long)osb->la_last_gd,
 300                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 301
 302         spin_lock(&osb->osb_lock);
 303         out += snprintf(buf + out, len - out,
 304                         "%10s => Slot: %d  NumStolen: %d\n", "Steal",
 305                         osb->s_inode_steal_slot,
 306                         atomic_read(&osb->s_num_inodes_stolen));
 307         spin_unlock(&osb->osb_lock);
 308
 309         out += snprintf(buf + out, len - out, "OrphanScan => ");
 310         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 311                         os->os_count, os->os_seqno);
 312         out += snprintf(buf + out, len - out, " Last Scan: ");
 313         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 314                 out += snprintf(buf + out, len - out, "Disabled\n");
 315         else
 316                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 317                                 (get_seconds() - os->os_scantime.tv_sec));
 318
 319         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 320                         "Slots", "Num", "RecoGen");
 321         for (i = 0; i < osb->max_slots; ++i) {
 322                 out += snprintf(buf + out, len - out,
 323                                 "%10s  %c %3d  %10d\n",
 324                                 " ",
 325                                 (i == osb->slot_num ? '*' : ' '),
 326                                 i, osb->slot_recovery_generations[i]);
 327         }
 328
 329         return out;
 330 }
 331
 332 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 333 {
 334         struct ocfs2_super *osb = inode->i_private;
 335         char *buf = NULL;
 336
 337         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 338         if (!buf)
 339                 goto bail;
 340
 341         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 342
 343         file->private_data = buf;
 344
 345         return 0;
 346 bail:
 347         return -ENOMEM;
 348 }
 349
 350 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 351 {
 352         kfree(file->private_data);
 353         return 0;
 354 }
 355
 356 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 357                                 size_t nbytes, loff_t *ppos)
 358 {
 359         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 360                                        i_size_read(file->f_mapping->host));
 361 }
 362 #else
 363 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 364 {
 365         return 0;
 366 }
 367 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 368 {
 369         return 0;
 370 }
 371 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 372                                 size_t nbytes, loff_t *ppos)
 373 {
 374         return 0;
 375 }
 376 #endif  /* CONFIG_DEBUG_FS */
 377
 378 static const struct file_operations ocfs2_osb_debug_fops = {
 379         .open =         ocfs2_osb_debug_open,
 380         .release =      ocfs2_debug_release,
 381         .read =         ocfs2_debug_read,
 382         .llseek =       generic_file_llseek,
 383 };
 384
 385 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 386 {
 387         int status;
 388         tid_t target;
 389         struct ocfs2_super *osb = OCFS2_SB(sb);
 390
 391         if (ocfs2_is_hard_readonly(osb))
 392                 return -EROFS;
 393
 394         if (wait) {
 395                 status = ocfs2_flush_truncate_log(osb);
 396                 if (status < 0)
 397                         mlog_errno(status);
 398         } else {
 399                 ocfs2_schedule_truncate_log_flush(osb, 0);
 400         }
 401
 402         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 403                                       &target)) {
 404                 if (wait)
 405                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 406                                              target);
 407         }
 408         return 0;
 409 }
 410
 411 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 412 {
 413         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 414             && (ino == USER_QUOTA_SYSTEM_INODE
 415                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 416                 return 0;
 417         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 418             && (ino == GROUP_QUOTA_SYSTEM_INODE
 419                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 420                 return 0;
 421         return 1;
 422 }
 423
 424 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 425 {
 426         struct inode *new = NULL;
 427         int status = 0;
 428         int i;
 429
 430         mlog_entry_void();
 431
 432         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 433         if (IS_ERR(new)) {
 434                 status = PTR_ERR(new);
 435                 mlog_errno(status);
 436                 goto bail;
 437         }
 438         osb->root_inode = new;
 439
 440         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 441         if (IS_ERR(new)) {
 442                 status = PTR_ERR(new);
 443                 mlog_errno(status);
 444                 goto bail;
 445         }
 446         osb->sys_root_inode = new;
 447
 448         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 449              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 450                 if (!ocfs2_need_system_inode(osb, i))
 451                         continue;
 452                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 453                 if (!new) {
 454                         ocfs2_release_system_inodes(osb);
 455                         status = -EINVAL;
 456                         mlog_errno(status);
 457                         /* FIXME: Should ERROR_RO_FS */
 458                         mlog(ML_ERROR, "Unable to load system inode %d, "
 459                              "possibly corrupt fs?", i);
 460                         goto bail;
 461                 }
 462                 // the array now has one ref, so drop this one
 463                 iput(new);
 464         }
 465
 466 bail:
 467         mlog_exit(status);
 468         return status;
 469 }
 470
 471 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 472 {
 473         struct inode *new = NULL;
 474         int status = 0;
 475         int i;
 476
 477         mlog_entry_void();
 478
 479         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 480              i < NUM_SYSTEM_INODES;
 481              i++) {
 482                 if (!ocfs2_need_system_inode(osb, i))
 483                         continue;
 484                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 485                 if (!new) {
 486                         ocfs2_release_system_inodes(osb);
 487                         status = -EINVAL;
 488                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 489                              status, i, osb->slot_num);
 490                         goto bail;
 491                 }
 492                 /* the array now has one ref, so drop this one */
 493                 iput(new);
 494         }
 495
 496 bail:
 497         mlog_exit(status);
 498         return status;
 499 }
 500
 501 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 502 {
 503         int i;
 504         struct inode *inode;
 505
 506         mlog_entry_void();
 507
 508         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 509                 inode = osb->system_inodes[i];
 510                 if (inode) {
 511                         iput(inode);
 512                         osb->system_inodes[i] = NULL;
 513                 }
 514         }
 515
 516         inode = osb->sys_root_inode;
 517         if (inode) {
 518                 iput(inode);
 519                 osb->sys_root_inode = NULL;
 520         }
 521
 522         inode = osb->root_inode;
 523         if (inode) {
 524                 iput(inode);
 525                 osb->root_inode = NULL;
 526         }
 527
 528         mlog_exit(0);
 529 }
 530
 531 /* We're allocating fs objects, use GFP_NOFS */
 532 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 533 {
 534         struct ocfs2_inode_info *oi;
 535
 536         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 537         if (!oi)
 538                 return NULL;
 539
 540         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 541         return &oi->vfs_inode;
 542 }
 543
 544 static void ocfs2_destroy_inode(struct inode *inode)
 545 {
 546         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 547 }
 548
 549 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 550                                                 unsigned int cbits)
 551 {
 552         unsigned int bytes = 1 << cbits;
 553         unsigned int trim = bytes;
 554         unsigned int bitshift = 32;
 555
 556         /*
 557          * i_size and all block offsets in ocfs2 are always 64 bits
 558          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 559          * 64 bit platforms, cluster size will be the limiting factor.
 560          */
 561
 562 #if BITS_PER_LONG == 32
 563 # if defined(CONFIG_LBDAF)
 564         BUILD_BUG_ON(sizeof(sector_t) != 8);
 565         /*
 566          * We might be limited by page cache size.
 567          */
 568         if (bytes > PAGE_CACHE_SIZE) {
 569                 bytes = PAGE_CACHE_SIZE;
 570                 trim = 1;
 571                 /*
 572                  * Shift by 31 here so that we don't get larger than
 573                  * MAX_LFS_FILESIZE
 574                  */
 575                 bitshift = 31;
 576         }
 577 # else
 578         /*
 579          * We are limited by the size of sector_t. Use block size, as
 580          * that's what we expose to the VFS.
 581          */
 582         bytes = 1 << bbits;
 583         trim = 1;
 584         bitshift = 31;
 585 # endif
 586 #endif
 587
 588         /*
 589          * Trim by a whole cluster when we can actually approach the
 590          * on-disk limits. Otherwise we can overflow i_clusters when
 591          * an extent start is at the max offset.
 592          */
 593         return (((unsigned long long)bytes) << bitshift) - trim;
 594 }
 595
 596 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 597 {
 598         int incompat_features;
 599         int ret = 0;
 600         struct mount_options parsed_options;
 601         struct ocfs2_super *osb = OCFS2_SB(sb);
 602
 603         lock_kernel();
 604
 605         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
 606             !ocfs2_check_set_options(sb, &parsed_options)) {
 607                 ret = -EINVAL;
 608                 goto out;
 609         }
 610
 611         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 612             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 613                 ret = -EINVAL;
 614                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 615                 goto out;
 616         }
 617
 618         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 619             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 620                 ret = -EINVAL;
 621                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 622                 goto out;
 623         }
 624
 625         /* Probably don't want this on remount; it might
 626          * mess with other nodes */
 627         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 628             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 629                 ret = -EINVAL;
 630                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 631                 goto out;
 632         }
 633
 634         /* We're going to/from readonly mode. */
 635         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 636                 /* Disable quota accounting before remounting RO */
 637                 if (*flags & MS_RDONLY) {
 638                         ret = ocfs2_susp_quotas(osb, 0);
 639                         if (ret < 0)
 640                                 goto out;
 641                 }
 642                 /* Lock here so the check of HARD_RO and the potential
 643                  * setting of SOFT_RO is atomic. */
 644                 spin_lock(&osb->osb_lock);
 645                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 646                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 647                         ret = -EROFS;
 648                         goto unlock_osb;
 649                 }
 650
 651                 if (*flags & MS_RDONLY) {
 652                         mlog(0, "Going to ro mode.\n");
 653                         sb->s_flags |= MS_RDONLY;
 654                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 655                 } else {
 656                         mlog(0, "Making ro filesystem writeable.\n");
 657
 658                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 659                                 mlog(ML_ERROR, "Cannot remount RDWR "
 660                                      "filesystem due to previous errors.\n");
 661                                 ret = -EROFS;
 662                                 goto unlock_osb;
 663                         }
 664                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 665                         if (incompat_features) {
 666                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 667                                      "of unsupported optional features "
 668                                      "(%x).\n", incompat_features);
 669                                 ret = -EINVAL;
 670                                 goto unlock_osb;
 671                         }
 672                         sb->s_flags &= ~MS_RDONLY;
 673                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 674                 }
 675 unlock_osb:
 676                 spin_unlock(&osb->osb_lock);
 677                 /* Enable quota accounting after remounting RW */
 678                 if (!ret && !(*flags & MS_RDONLY)) {
 679                         if (sb_any_quota_suspended(sb))
 680                                 ret = ocfs2_susp_quotas(osb, 1);
 681                         else
 682                                 ret = ocfs2_enable_quotas(osb);
 683                         if (ret < 0) {
 684                                 /* Return back changes... */
 685                                 spin_lock(&osb->osb_lock);
 686                                 sb->s_flags |= MS_RDONLY;
 687                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 688                                 spin_unlock(&osb->osb_lock);
 689                                 goto out;
 690                         }
 691                 }
 692         }
 693
 694         if (!ret) {
 695                 /* Only save off the new mount options in case of a successful
 696                  * remount. */
 697                 osb->s_mount_opt = parsed_options.mount_opt;
 698                 osb->s_atime_quantum = parsed_options.atime_quantum;
 699                 osb->preferred_slot = parsed_options.slot;
 700                 if (parsed_options.commit_interval)
 701                         osb->osb_commit_interval = parsed_options.commit_interval;
 702
 703                 if (!ocfs2_is_hard_readonly(osb))
 704                         ocfs2_set_journal_params(osb);
 705
 706                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 707                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
 708                                                         MS_POSIXACL : 0);
 709         }
 710 out:
 711         unlock_kernel();
 712         return ret;
 713 }
 714
 715 static int ocfs2_sb_probe(struct super_block *sb,
 716                           struct buffer_head **bh,
 717                           int *sector_size,
 718                           struct ocfs2_blockcheck_stats *stats)
 719 {
 720         int status, tmpstat;
 721         struct ocfs1_vol_disk_hdr *hdr;
 722         struct ocfs2_dinode *di;
 723         int blksize;
 724
 725         *bh = NULL;
 726
 727         /* may be > 512 */
 728         *sector_size = bdev_logical_block_size(sb->s_bdev);
 729         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 730                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 731                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 732                 status = -EINVAL;
 733                 goto bail;
 734         }
 735
 736         /* Can this really happen? */
 737         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 738                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 739
 740         /* check block zero for old format */
 741         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 742         if (status < 0) {
 743                 mlog_errno(status);
 744                 goto bail;
 745         }
 746         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 747         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 748                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 749                      hdr->major_version, hdr->minor_version);
 750                 status = -EINVAL;
 751         }
 752         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 753                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 754                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 755                      hdr->signature);
 756                 status = -EINVAL;
 757         }
 758         brelse(*bh);
 759         *bh = NULL;
 760         if (status < 0) {
 761                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 762                      "upgraded before mounting with ocfs v2\n");
 763                 goto bail;
 764         }
 765
 766         /*
 767          * Now check at magic offset for 512, 1024, 2048, 4096
 768          * blocksizes.  4096 is the maximum blocksize because it is
 769          * the minimum clustersize.
 770          */
 771         status = -EINVAL;
 772         for (blksize = *sector_size;
 773              blksize <= OCFS2_MAX_BLOCKSIZE;
 774              blksize <<= 1) {
 775                 tmpstat = ocfs2_get_sector(sb, bh,
 776                                            OCFS2_SUPER_BLOCK_BLKNO,
 777                                            blksize);
 778                 if (tmpstat < 0) {
 779                         status = tmpstat;
 780                         mlog_errno(status);
 781                         break;
 782                 }
 783                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 784                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 785                 spin_lock_init(&stats->b_lock);
 786                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
 787                 if (tmpstat < 0) {
 788                         brelse(*bh);
 789                         *bh = NULL;
 790                 }
 791                 if (tmpstat != -EAGAIN) {
 792                         status = tmpstat;
 793                         break;
 794                 }
 795         }
 796
 797 bail:
 798         return status;
 799 }
 800
 801 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 802 {
 803         if (ocfs2_mount_local(osb)) {
 804                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 805                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 806                              "mounted device.\n");
 807                         return -EINVAL;
 808                 }
 809         }
 810
 811         if (ocfs2_userspace_stack(osb)) {
 812                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 813                         mlog(ML_ERROR, "Userspace stack expected, but "
 814                              "o2cb heartbeat arguments passed to mount\n");
 815                         return -EINVAL;
 816                 }
 817         }
 818
 819         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 820                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 821                     !ocfs2_userspace_stack(osb)) {
 822                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 823                              "a read-write clustered device.\n");
 824                         return -EINVAL;
 825                 }
 826         }
 827
 828         return 0;
 829 }
 830
 831 /*
 832  * If we're using a userspace stack, mount should have passed
 833  * a name that matches the disk.  If not, mount should not
 834  * have passed a stack.
 835  */
 836 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 837                                         struct mount_options *mopt)
 838 {
 839         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 840                 mlog(ML_ERROR,
 841                      "cluster stack passed to mount, but this filesystem "
 842                      "does not support it\n");
 843                 return -EINVAL;
 844         }
 845
 846         if (ocfs2_userspace_stack(osb) &&
 847             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 848                     OCFS2_STACK_LABEL_LEN)) {
 849                 mlog(ML_ERROR,
 850                      "cluster stack passed to mount (\"%s\") does not "
 851                      "match the filesystem (\"%s\")\n",
 852                      mopt->cluster_stack,
 853                      osb->osb_cluster_stack);
 854                 return -EINVAL;
 855         }
 856
 857         return 0;
 858 }
 859
 860 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 861 {
 862         int type;
 863         struct super_block *sb = osb->sb;
 864         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 865                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 866         int status = 0;
 867
 868         for (type = 0; type < MAXQUOTAS; type++) {
 869                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 870                         continue;
 871                 if (unsuspend)
 872                         status = vfs_quota_enable(
 873                                         sb_dqopt(sb)->files[type],
 874                                         type, QFMT_OCFS2,
 875                                         DQUOT_SUSPENDED);
 876                 else
 877                         status = vfs_quota_disable(sb, type,
 878                                                    DQUOT_SUSPENDED);
 879                 if (status < 0)
 880                         break;
 881         }
 882         if (status < 0)
 883                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 884                      "remount (error = %d).\n", status);
 885         return status;
 886 }
 887
 888 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 889 {
 890         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 891         struct super_block *sb = osb->sb;
 892         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 893                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 894         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 895                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 896         int status;
 897         int type;
 898
 899         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 900         for (type = 0; type < MAXQUOTAS; type++) {
 901                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 902                         continue;
 903                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 904                                                         osb->slot_num);
 905                 if (!inode[type]) {
 906                         status = -ENOENT;
 907                         goto out_quota_off;
 908                 }
 909                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 910                                                 DQUOT_USAGE_ENABLED);
 911                 if (status < 0)
 912                         goto out_quota_off;
 913         }
 914
 915         for (type = 0; type < MAXQUOTAS; type++)
 916                 iput(inode[type]);
 917         return 0;
 918 out_quota_off:
 919         ocfs2_disable_quotas(osb);
 920         for (type = 0; type < MAXQUOTAS; type++)
 921                 iput(inode[type]);
 922         mlog_errno(status);
 923         return status;
 924 }
 925
 926 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 927 {
 928         int type;
 929         struct inode *inode;
 930         struct super_block *sb = osb->sb;
 931
 932         /* We mostly ignore errors in this function because there's not much
 933          * we can do when we see them */
 934         for (type = 0; type < MAXQUOTAS; type++) {
 935                 if (!sb_has_quota_loaded(sb, type))
 936                         continue;
 937                 inode = igrab(sb->s_dquot.files[type]);
 938                 /* Turn off quotas. This will remove all dquot structures from
 939                  * memory and so they will be automatically synced to global
 940                  * quota files */
 941                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 942                                             DQUOT_LIMITS_ENABLED);
 943                 if (!inode)
 944                         continue;
 945                 iput(inode);
 946         }
 947 }
 948
 949 /* Handle quota on quotactl */
 950 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 951                           char *path, int remount)
 952 {
 953         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 954                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 955
 956         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 957                 return -EINVAL;
 958
 959         if (remount)
 960                 return 0;       /* Just ignore it has been handled in
 961                                  * ocfs2_remount() */
 962         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 963                                     format_id, DQUOT_LIMITS_ENABLED);
 964 }
 965
 966 /* Handle quota off quotactl */
 967 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 968 {
 969         if (remount)
 970                 return 0;       /* Ignore now and handle later in
 971                                  * ocfs2_remount() */
 972         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 973 }
 974
 975 static const struct quotactl_ops ocfs2_quotactl_ops = {
 976         .quota_on       = ocfs2_quota_on,
 977         .quota_off      = ocfs2_quota_off,
 978         .quota_sync     = vfs_quota_sync,
 979         .get_info       = vfs_get_dqinfo,
 980         .set_info       = vfs_set_dqinfo,
 981         .get_dqblk      = vfs_get_dqblk,
 982         .set_dqblk      = vfs_set_dqblk,
 983 };
 984
 985 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 986 {
 987         struct dentry *root;
 988         int status, sector_size;
 989         struct mount_options parsed_options;
 990         struct inode *inode = NULL;
 991         struct ocfs2_super *osb = NULL;
 992         struct buffer_head *bh = NULL;
 993         char nodestr[8];
 994         struct ocfs2_blockcheck_stats stats;
 995
 996         mlog_entry("%p, %p, %i", sb, data, silent);
 997
 998         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 999                 status = -EINVAL;
1000                 goto read_super_error;
1001         }
1002
1003         /* probe for superblock */
1004         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1005         if (status < 0) {
1006                 mlog(ML_ERROR, "superblock probe failed!\n");
1007                 goto read_super_error;
1008         }
1009
1010         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1011         osb = OCFS2_SB(sb);
1012         if (status < 0) {
1013                 mlog_errno(status);
1014                 goto read_super_error;
1015         }
1016         brelse(bh);
1017         bh = NULL;
1018
1019         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1020                 status = -EINVAL;
1021                 goto read_super_error;
1022         }
1023         osb->s_mount_opt = parsed_options.mount_opt;
1024         osb->s_atime_quantum = parsed_options.atime_quantum;
1025         osb->preferred_slot = parsed_options.slot;
1026         osb->osb_commit_interval = parsed_options.commit_interval;
1027         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1028         osb->local_alloc_bits = osb->local_alloc_default_bits;
1029
1030         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1031         if (status)
1032                 goto read_super_error;
1033
1034         sb->s_magic = OCFS2_SUPER_MAGIC;
1035
1036         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1037                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1038
1039         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1040          * heartbeat=none */
1041         if (bdev_read_only(sb->s_bdev)) {
1042                 if (!(sb->s_flags & MS_RDONLY)) {
1043                         status = -EACCES;
1044                         mlog(ML_ERROR, "Readonly device detected but readonly "
1045                              "mount was not specified.\n");
1046                         goto read_super_error;
1047                 }
1048
1049                 /* You should not be able to start a local heartbeat
1050                  * on a readonly device. */
1051                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1052                         status = -EROFS;
1053                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1054                              "device.\n");
1055                         goto read_super_error;
1056                 }
1057
1058                 status = ocfs2_check_journals_nolocks(osb);
1059                 if (status < 0) {
1060                         if (status == -EROFS)
1061                                 mlog(ML_ERROR, "Recovery required on readonly "
1062                                      "file system, but write access is "
1063                                      "unavailable.\n");
1064                         else
1065                                 mlog_errno(status);
1066                         goto read_super_error;
1067                 }
1068
1069                 ocfs2_set_ro_flag(osb, 1);
1070
1071                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1072                        "services will be utilized for this mount. Recovery "
1073                        "will be skipped.\n");
1074         }
1075
1076         if (!ocfs2_is_hard_readonly(osb)) {
1077                 if (sb->s_flags & MS_RDONLY)
1078                         ocfs2_set_ro_flag(osb, 0);
1079         }
1080
1081         status = ocfs2_verify_heartbeat(osb);
1082         if (status < 0) {
1083                 mlog_errno(status);
1084                 goto read_super_error;
1085         }
1086
1087         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1088                                                  ocfs2_debugfs_root);
1089         if (!osb->osb_debug_root) {
1090                 status = -EINVAL;
1091                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1092                 goto read_super_error;
1093         }
1094
1095         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1096                                             osb->osb_debug_root,
1097                                             osb,
1098                                             &ocfs2_osb_debug_fops);
1099         if (!osb->osb_ctxt) {
1100                 status = -EINVAL;
1101                 mlog_errno(status);
1102                 goto read_super_error;
1103         }
1104
1105         if (ocfs2_meta_ecc(osb)) {
1106                 status = ocfs2_blockcheck_stats_debugfs_install(
1107                                                 &osb->osb_ecc_stats,
1108                                                 osb->osb_debug_root);
1109                 if (status) {
1110                         mlog(ML_ERROR,
1111                              "Unable to create blockcheck statistics "
1112                              "files\n");
1113                         goto read_super_error;
1114                 }
1115         }
1116
1117         status = ocfs2_mount_volume(sb);
1118         if (osb->root_inode)
1119                 inode = igrab(osb->root_inode);
1120
1121         if (status < 0)
1122                 goto read_super_error;
1123
1124         if (!inode) {
1125                 status = -EIO;
1126                 mlog_errno(status);
1127                 goto read_super_error;
1128         }
1129
1130         root = d_alloc_root(inode);
1131         if (!root) {
1132                 status = -ENOMEM;
1133                 mlog_errno(status);
1134                 goto read_super_error;
1135         }
1136
1137         sb->s_root = root;
1138
1139         ocfs2_complete_mount_recovery(osb);
1140
1141         if (ocfs2_mount_local(osb))
1142                 snprintf(nodestr, sizeof(nodestr), "local");
1143         else
1144                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1145
1146         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1147                "with %s data mode.\n",
1148                osb->dev_str, nodestr, osb->slot_num,
1149                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1150                "ordered");
1151
1152         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1153         wake_up(&osb->osb_mount_event);
1154
1155         /* Now we can initialize quotas because we can afford to wait
1156          * for cluster locks recovery now. That also means that truncation
1157          * log recovery can happen but that waits for proper quota setup */
1158         if (!(sb->s_flags & MS_RDONLY)) {
1159                 status = ocfs2_enable_quotas(osb);
1160                 if (status < 0) {
1161                         /* We have to err-out specially here because
1162                          * s_root is already set */
1163                         mlog_errno(status);
1164                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1165                         wake_up(&osb->osb_mount_event);
1166                         mlog_exit(status);
1167                         return status;
1168                 }
1169         }
1170
1171         ocfs2_complete_quota_recovery(osb);
1172
1173         /* Now we wake up again for processes waiting for quotas */
1174         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1175         wake_up(&osb->osb_mount_event);
1176
1177         /* Start this when the mount is almost sure of being successful */
1178         ocfs2_orphan_scan_start(osb);
1179
1180         mlog_exit(status);
1181         return status;
1182
1183 read_super_error:
1184         brelse(bh);
1185
1186         if (inode)
1187                 iput(inode);
1188
1189         if (osb) {
1190                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1191                 wake_up(&osb->osb_mount_event);
1192                 ocfs2_dismount_volume(sb, 1);
1193         }
1194
1195         mlog_exit(status);
1196         return status;
1197 }
1198
1199 static int ocfs2_get_sb(struct file_system_type *fs_type,
1200                         int flags,
1201                         const char *dev_name,
1202                         void *data,
1203                         struct vfsmount *mnt)
1204 {
1205         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1206                            mnt);
1207 }
1208
1209 static void ocfs2_kill_sb(struct super_block *sb)
1210 {
1211         struct ocfs2_super *osb = OCFS2_SB(sb);
1212
1213         /* Failed mount? */
1214         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1215                 goto out;
1216
1217         /* Prevent further queueing of inode drop events */
1218         spin_lock(&dentry_list_lock);
1219         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1220         spin_unlock(&dentry_list_lock);
1221         /* Wait for work to finish and/or remove it */
1222         cancel_work_sync(&osb->dentry_lock_work);
1223 out:
1224         kill_block_super(sb);
1225 }
1226
1227 static struct file_system_type ocfs2_fs_type = {
1228         .owner          = THIS_MODULE,
1229         .name           = "ocfs2",
1230         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1231                                         * the fs? */
1232         .kill_sb        = ocfs2_kill_sb,
1233
1234         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1235         .next           = NULL
1236 };
1237
1238 static int ocfs2_check_set_options(struct super_block *sb,
1239                                    struct mount_options *options)
1240 {
1241         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1242             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1243                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1244                 mlog(ML_ERROR, "User quotas were requested, but this "
1245                      "filesystem does not have the feature enabled.\n");
1246                 return 0;
1247         }
1248         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1249             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1250                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1251                 mlog(ML_ERROR, "Group quotas were requested, but this "
1252                      "filesystem does not have the feature enabled.\n");
1253                 return 0;
1254         }
1255         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1256             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1257                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1258                      "feature is not enabled\n");
1259                 return 0;
1260         }
1261         /* No ACL setting specified? Use XATTR feature... */
1262         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1263                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1264                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1265                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1266                 else
1267                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1268         }
1269         return 1;
1270 }
1271
1272 static int ocfs2_parse_options(struct super_block *sb,
1273                                char *options,
1274                                struct mount_options *mopt,
1275                                int is_remount)
1276 {
1277         int status;
1278         char *p;
1279
1280         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1281                    options ? options : "(none)");
1282
1283         mopt->commit_interval = 0;
1284         mopt->mount_opt = 0;
1285         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1286         mopt->slot = OCFS2_INVALID_SLOT;
1287         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1288         mopt->cluster_stack[0] = '\0';
1289
1290         if (!options) {
1291                 status = 1;
1292                 goto bail;
1293         }
1294
1295         while ((p = strsep(&options, ",")) != NULL) {
1296                 int token, option;
1297                 substring_t args[MAX_OPT_ARGS];
1298
1299                 if (!*p)
1300                         continue;
1301
1302                 token = match_token(p, tokens, args);
1303                 switch (token) {
1304                 case Opt_hb_local:
1305                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1306                         break;
1307                 case Opt_hb_none:
1308                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1309                         break;
1310                 case Opt_barrier:
1311                         if (match_int(&args[0], &option)) {
1312                                 status = 0;
1313                                 goto bail;
1314                         }
1315                         if (option)
1316                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1317                         else
1318                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1319                         break;
1320                 case Opt_intr:
1321                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1322                         break;
1323                 case Opt_nointr:
1324                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1325                         break;
1326                 case Opt_err_panic:
1327                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1328                         break;
1329                 case Opt_err_ro:
1330                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1331                         break;
1332                 case Opt_data_ordered:
1333                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1334                         break;
1335                 case Opt_data_writeback:
1336                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1337                         break;
1338                 case Opt_user_xattr:
1339                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1340                         break;
1341                 case Opt_nouser_xattr:
1342                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1343                         break;
1344                 case Opt_atime_quantum:
1345                         if (match_int(&args[0], &option)) {
1346                                 status = 0;
1347                                 goto bail;
1348                         }
1349                         if (option >= 0)
1350                                 mopt->atime_quantum = option;
1351                         break;
1352                 case Opt_slot:
1353                         option = 0;
1354                         if (match_int(&args[0], &option)) {
1355                                 status = 0;
1356                                 goto bail;
1357                         }
1358                         if (option)
1359                                 mopt->slot = (s16)option;
1360                         break;
1361                 case Opt_commit:
1362                         option = 0;
1363                         if (match_int(&args[0], &option)) {
1364                                 status = 0;
1365                                 goto bail;
1366                         }
1367                         if (option < 0)
1368                                 return 0;
1369                         if (option == 0)
1370                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1371                         mopt->commit_interval = HZ * option;
1372                         break;
1373                 case Opt_localalloc:
1374                         option = 0;
1375                         if (match_int(&args[0], &option)) {
1376                                 status = 0;
1377                                 goto bail;
1378                         }
1379                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1380                                 mopt->localalloc_opt = option;
1381                         break;
1382                 case Opt_localflocks:
1383                         /*
1384                          * Changing this during remount could race
1385                          * flock() requests, or "unbalance" existing
1386                          * ones (e.g., a lock is taken in one mode but
1387                          * dropped in the other). If users care enough
1388                          * to flip locking modes during remount, we
1389                          * could add a "local" flag to individual
1390                          * flock structures for proper tracking of
1391                          * state.
1392                          */
1393                         if (!is_remount)
1394                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1395                         break;
1396                 case Opt_stack:
1397                         /* Check both that the option we were passed
1398                          * is of the right length and that it is a proper
1399                          * string of the right length.
1400                          */
1401                         if (((args[0].to - args[0].from) !=
1402                              OCFS2_STACK_LABEL_LEN) ||
1403                             (strnlen(args[0].from,
1404                                      OCFS2_STACK_LABEL_LEN) !=
1405                              OCFS2_STACK_LABEL_LEN)) {
1406                                 mlog(ML_ERROR,
1407                                      "Invalid cluster_stack option\n");
1408                                 status = 0;
1409                                 goto bail;
1410                         }
1411                         memcpy(mopt->cluster_stack, args[0].from,
1412                                OCFS2_STACK_LABEL_LEN);
1413                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1414                         break;
1415                 case Opt_inode64:
1416                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1417                         break;
1418                 case Opt_usrquota:
1419                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1420                         break;
1421                 case Opt_grpquota:
1422                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1423                         break;
1424                 case Opt_acl:
1425                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1426                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1427                         break;
1428                 case Opt_noacl:
1429                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1430                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1431                         break;
1432                 default:
1433                         mlog(ML_ERROR,
1434                              "Unrecognized mount option \"%s\" "
1435                              "or missing value\n", p);
1436                         status = 0;
1437                         goto bail;
1438                 }
1439         }
1440
1441         status = 1;
1442
1443 bail:
1444         mlog_exit(status);
1445         return status;
1446 }
1447
1448 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1449 {
1450         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1451         unsigned long opts = osb->s_mount_opt;
1452         unsigned int local_alloc_megs;
1453
1454         if (opts & OCFS2_MOUNT_HB_LOCAL)
1455                 seq_printf(s, ",_netdev,heartbeat=local");
1456         else
1457                 seq_printf(s, ",heartbeat=none");
1458
1459         if (opts & OCFS2_MOUNT_NOINTR)
1460                 seq_printf(s, ",nointr");
1461
1462         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1463                 seq_printf(s, ",data=writeback");
1464         else
1465                 seq_printf(s, ",data=ordered");
1466
1467         if (opts & OCFS2_MOUNT_BARRIER)
1468                 seq_printf(s, ",barrier=1");
1469
1470         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1471                 seq_printf(s, ",errors=panic");
1472         else
1473                 seq_printf(s, ",errors=remount-ro");
1474
1475         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1476                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1477
1478         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1479                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1480
1481         if (osb->osb_commit_interval)
1482                 seq_printf(s, ",commit=%u",
1483                            (unsigned) (osb->osb_commit_interval / HZ));
1484
1485         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1486         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1487                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1488
1489         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1490                 seq_printf(s, ",localflocks,");
1491
1492         if (osb->osb_cluster_stack[0])
1493                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1494                            osb->osb_cluster_stack);
1495         if (opts & OCFS2_MOUNT_USRQUOTA)
1496                 seq_printf(s, ",usrquota");
1497         if (opts & OCFS2_MOUNT_GRPQUOTA)
1498                 seq_printf(s, ",grpquota");
1499
1500         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1501                 seq_printf(s, ",nouser_xattr");
1502         else
1503                 seq_printf(s, ",user_xattr");
1504
1505         if (opts & OCFS2_MOUNT_INODE64)
1506                 seq_printf(s, ",inode64");
1507
1508         if (opts & OCFS2_MOUNT_POSIX_ACL)
1509                 seq_printf(s, ",acl");
1510         else
1511                 seq_printf(s, ",noacl");
1512
1513         return 0;
1514 }
1515
1516 static int __init ocfs2_init(void)
1517 {
1518         int status;
1519
1520         mlog_entry_void();
1521
1522         ocfs2_print_version();
1523
1524         status = init_ocfs2_uptodate_cache();
1525         if (status < 0) {
1526                 mlog_errno(status);
1527                 goto leave;
1528         }
1529
1530         status = ocfs2_initialize_mem_caches();
1531         if (status < 0) {
1532                 mlog_errno(status);
1533                 goto leave;
1534         }
1535
1536         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1537         if (!ocfs2_wq) {
1538                 status = -ENOMEM;
1539                 goto leave;
1540         }
1541
1542         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1543         if (!ocfs2_debugfs_root) {
1544                 status = -EFAULT;
1545                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1546         }
1547
1548         status = ocfs2_quota_setup();
1549         if (status)
1550                 goto leave;
1551
1552         ocfs2_set_locking_protocol();
1553
1554         status = register_quota_format(&ocfs2_quota_format);
1555 leave:
1556         if (status < 0) {
1557                 ocfs2_quota_shutdown();
1558                 ocfs2_free_mem_caches();
1559                 exit_ocfs2_uptodate_cache();
1560         }
1561
1562         mlog_exit(status);
1563
1564         if (status >= 0) {
1565                 return register_filesystem(&ocfs2_fs_type);
1566         } else
1567                 return -1;
1568 }
1569
1570 static void __exit ocfs2_exit(void)
1571 {
1572         mlog_entry_void();
1573
1574         ocfs2_quota_shutdown();
1575
1576         if (ocfs2_wq) {
1577                 flush_workqueue(ocfs2_wq);
1578                 destroy_workqueue(ocfs2_wq);
1579         }
1580
1581         unregister_quota_format(&ocfs2_quota_format);
1582
1583         debugfs_remove(ocfs2_debugfs_root);
1584
1585         ocfs2_free_mem_caches();
1586
1587         unregister_filesystem(&ocfs2_fs_type);
1588
1589         exit_ocfs2_uptodate_cache();
1590
1591         mlog_exit_void();
1592 }
1593
1594 static void ocfs2_put_super(struct super_block *sb)
1595 {
1596         mlog_entry("(0x%p)\n", sb);
1597
1598         lock_kernel();
1599
1600         ocfs2_sync_blockdev(sb);
1601         ocfs2_dismount_volume(sb, 0);
1602
1603         unlock_kernel();
1604
1605         mlog_exit_void();
1606 }
1607
1608 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1609 {
1610         struct ocfs2_super *osb;
1611         u32 numbits, freebits;
1612         int status;
1613         struct ocfs2_dinode *bm_lock;
1614         struct buffer_head *bh = NULL;
1615         struct inode *inode = NULL;
1616
1617         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1618
1619         osb = OCFS2_SB(dentry->d_sb);
1620
1621         inode = ocfs2_get_system_file_inode(osb,
1622                                             GLOBAL_BITMAP_SYSTEM_INODE,
1623                                             OCFS2_INVALID_SLOT);
1624         if (!inode) {
1625                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1626                 status = -EIO;
1627                 goto bail;
1628         }
1629
1630         status = ocfs2_inode_lock(inode, &bh, 0);
1631         if (status < 0) {
1632                 mlog_errno(status);
1633                 goto bail;
1634         }
1635
1636         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1637
1638         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1639         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1640
1641         buf->f_type = OCFS2_SUPER_MAGIC;
1642         buf->f_bsize = dentry->d_sb->s_blocksize;
1643         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1644         buf->f_blocks = ((sector_t) numbits) *
1645                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1646         buf->f_bfree = ((sector_t) freebits) *
1647                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1648         buf->f_bavail = buf->f_bfree;
1649         buf->f_files = numbits;
1650         buf->f_ffree = freebits;
1651
1652         brelse(bh);
1653
1654         ocfs2_inode_unlock(inode, 0);
1655         status = 0;
1656 bail:
1657         if (inode)
1658                 iput(inode);
1659
1660         mlog_exit(status);
1661
1662         return status;
1663 }
1664
1665 static void ocfs2_inode_init_once(void *data)
1666 {
1667         struct ocfs2_inode_info *oi = data;
1668
1669         oi->ip_flags = 0;
1670         oi->ip_open_count = 0;
1671         spin_lock_init(&oi->ip_lock);
1672         ocfs2_extent_map_init(&oi->vfs_inode);
1673         INIT_LIST_HEAD(&oi->ip_io_markers);
1674         oi->ip_dir_start_lookup = 0;
1675
1676         init_rwsem(&oi->ip_alloc_sem);
1677         init_rwsem(&oi->ip_xattr_sem);
1678         mutex_init(&oi->ip_io_mutex);
1679
1680         oi->ip_blkno = 0ULL;
1681         oi->ip_clusters = 0;
1682
1683         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1684         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1685         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1686
1687         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1688                                   &ocfs2_inode_caching_ops);
1689
1690         inode_init_once(&oi->vfs_inode);
1691 }
1692
1693 static int ocfs2_initialize_mem_caches(void)
1694 {
1695         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1696                                        sizeof(struct ocfs2_inode_info),
1697                                        0,
1698                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1699                                                 SLAB_MEM_SPREAD),
1700                                        ocfs2_inode_init_once);
1701         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1702                                         sizeof(struct ocfs2_dquot),
1703                                         0,
1704                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1705                                                 SLAB_MEM_SPREAD),
1706                                         NULL);
1707         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1708                                         sizeof(struct ocfs2_quota_chunk),
1709                                         0,
1710                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1711                                         NULL);
1712         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1713             !ocfs2_qf_chunk_cachep) {
1714                 if (ocfs2_inode_cachep)
1715                         kmem_cache_destroy(ocfs2_inode_cachep);
1716                 if (ocfs2_dquot_cachep)
1717                         kmem_cache_destroy(ocfs2_dquot_cachep);
1718                 if (ocfs2_qf_chunk_cachep)
1719                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1720                 return -ENOMEM;
1721         }
1722
1723         return 0;
1724 }
1725
1726 static void ocfs2_free_mem_caches(void)
1727 {
1728         if (ocfs2_inode_cachep)
1729                 kmem_cache_destroy(ocfs2_inode_cachep);
1730         ocfs2_inode_cachep = NULL;
1731
1732         if (ocfs2_dquot_cachep)
1733                 kmem_cache_destroy(ocfs2_dquot_cachep);
1734         ocfs2_dquot_cachep = NULL;
1735
1736         if (ocfs2_qf_chunk_cachep)
1737                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1738         ocfs2_qf_chunk_cachep = NULL;
1739 }
1740
1741 static int ocfs2_get_sector(struct super_block *sb,
1742                             struct buffer_head **bh,
1743                             int block,
1744                             int sect_size)
1745 {
1746         if (!sb_set_blocksize(sb, sect_size)) {
1747                 mlog(ML_ERROR, "unable to set blocksize\n");
1748                 return -EIO;
1749         }
1750
1751         *bh = sb_getblk(sb, block);
1752         if (!*bh) {
1753                 mlog_errno(-EIO);
1754                 return -EIO;
1755         }
1756         lock_buffer(*bh);
1757         if (!buffer_dirty(*bh))
1758                 clear_buffer_uptodate(*bh);
1759         unlock_buffer(*bh);
1760         ll_rw_block(READ, 1, bh);
1761         wait_on_buffer(*bh);
1762         if (!buffer_uptodate(*bh)) {
1763                 mlog_errno(-EIO);
1764                 brelse(*bh);
1765                 *bh = NULL;
1766                 return -EIO;
1767         }
1768
1769         return 0;
1770 }
1771
1772 static int ocfs2_mount_volume(struct super_block *sb)
1773 {
1774         int status = 0;
1775         int unlock_super = 0;
1776         struct ocfs2_super *osb = OCFS2_SB(sb);
1777
1778         mlog_entry_void();
1779
1780         if (ocfs2_is_hard_readonly(osb))
1781                 goto leave;
1782
1783         status = ocfs2_dlm_init(osb);
1784         if (status < 0) {
1785                 mlog_errno(status);
1786                 goto leave;
1787         }
1788
1789         status = ocfs2_super_lock(osb, 1);
1790         if (status < 0) {
1791                 mlog_errno(status);
1792                 goto leave;
1793         }
1794         unlock_super = 1;
1795
1796         /* This will load up the node map and add ourselves to it. */
1797         status = ocfs2_find_slot(osb);
1798         if (status < 0) {
1799                 mlog_errno(status);
1800                 goto leave;
1801         }
1802
1803         /* load all node-local system inodes */
1804         status = ocfs2_init_local_system_inodes(osb);
1805         if (status < 0) {
1806                 mlog_errno(status);
1807                 goto leave;
1808         }
1809
1810         status = ocfs2_check_volume(osb);
1811         if (status < 0) {
1812                 mlog_errno(status);
1813                 goto leave;
1814         }
1815
1816         status = ocfs2_truncate_log_init(osb);
1817         if (status < 0)
1818                 mlog_errno(status);
1819
1820 leave:
1821         if (unlock_super)
1822                 ocfs2_super_unlock(osb, 1);
1823
1824         mlog_exit(status);
1825         return status;
1826 }
1827
1828 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1829 {
1830         int tmp, hangup_needed = 0;
1831         struct ocfs2_super *osb = NULL;
1832         char nodestr[8];
1833
1834         mlog_entry("(0x%p)\n", sb);
1835
1836         BUG_ON(!sb);
1837         osb = OCFS2_SB(sb);
1838         BUG_ON(!osb);
1839
1840         debugfs_remove(osb->osb_ctxt);
1841
1842         /*
1843          * Flush inode dropping work queue so that deletes are
1844          * performed while the filesystem is still working
1845          */
1846         ocfs2_drop_all_dl_inodes(osb);
1847
1848         /* Orphan scan should be stopped as early as possible */
1849         ocfs2_orphan_scan_stop(osb);
1850
1851         ocfs2_disable_quotas(osb);
1852
1853         ocfs2_shutdown_local_alloc(osb);
1854
1855         ocfs2_truncate_log_shutdown(osb);
1856
1857         /* This will disable recovery and flush any recovery work. */
1858         ocfs2_recovery_exit(osb);
1859
1860         ocfs2_journal_shutdown(osb);
1861
1862         ocfs2_sync_blockdev(sb);
1863
1864         ocfs2_purge_refcount_trees(osb);
1865
1866         /* No cluster connection means we've failed during mount, so skip
1867          * all the steps which depended on that to complete. */
1868         if (osb->cconn) {
1869                 tmp = ocfs2_super_lock(osb, 1);
1870                 if (tmp < 0) {
1871                         mlog_errno(tmp);
1872                         return;
1873                 }
1874         }
1875
1876         if (osb->slot_num != OCFS2_INVALID_SLOT)
1877                 ocfs2_put_slot(osb);
1878
1879         if (osb->cconn)
1880                 ocfs2_super_unlock(osb, 1);
1881
1882         ocfs2_release_system_inodes(osb);
1883
1884         /*
1885          * If we're dismounting due to mount error, mount.ocfs2 will clean
1886          * up heartbeat.  If we're a local mount, there is no heartbeat.
1887          * If we failed before we got a uuid_str yet, we can't stop
1888          * heartbeat.  Otherwise, do it.
1889          */
1890         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1891                 hangup_needed = 1;
1892
1893         if (osb->cconn)
1894                 ocfs2_dlm_shutdown(osb, hangup_needed);
1895
1896         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1897         debugfs_remove(osb->osb_debug_root);
1898
1899         if (hangup_needed)
1900                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1901
1902         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1903
1904         if (ocfs2_mount_local(osb))
1905                 snprintf(nodestr, sizeof(nodestr), "local");
1906         else
1907                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1908
1909         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1910                osb->dev_str, nodestr);
1911
1912         ocfs2_delete_osb(osb);
1913         kfree(osb);
1914         sb->s_dev = 0;
1915         sb->s_fs_info = NULL;
1916 }
1917
1918 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1919                                 unsigned uuid_bytes)
1920 {
1921         int i, ret;
1922         char *ptr;
1923
1924         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1925
1926         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1927         if (osb->uuid_str == NULL)
1928                 return -ENOMEM;
1929
1930         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1931                 /* print with null */
1932                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1933                 if (ret != 2) /* drop super cleans up */
1934                         return -EINVAL;
1935                 /* then only advance past the last char */
1936                 ptr += 2;
1937         }
1938
1939         return 0;
1940 }
1941
1942 static int ocfs2_initialize_super(struct super_block *sb,
1943                                   struct buffer_head *bh,
1944                                   int sector_size,
1945                                   struct ocfs2_blockcheck_stats *stats)
1946 {
1947         int status;
1948         int i, cbits, bbits;
1949         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1950         struct inode *inode = NULL;
1951         struct ocfs2_journal *journal;
1952         __le32 uuid_net_key;
1953         struct ocfs2_super *osb;
1954
1955         mlog_entry_void();
1956
1957         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1958         if (!osb) {
1959                 status = -ENOMEM;
1960                 mlog_errno(status);
1961                 goto bail;
1962         }
1963
1964         sb->s_fs_info = osb;
1965         sb->s_op = &ocfs2_sops;
1966         sb->s_export_op = &ocfs2_export_ops;
1967         sb->s_qcop = &ocfs2_quotactl_ops;
1968         sb->dq_op = &ocfs2_quota_operations;
1969         sb->s_xattr = ocfs2_xattr_handlers;
1970         sb->s_time_gran = 1;
1971         sb->s_flags |= MS_NOATIME;
1972         /* this is needed to support O_LARGEFILE */
1973         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1974         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1975         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1976
1977         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1978
1979         for (i = 0; i < 3; i++)
1980                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1981         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1982
1983         osb->sb = sb;
1984         /* Save off for ocfs2_rw_direct */
1985         osb->s_sectsize_bits = blksize_bits(sector_size);
1986         BUG_ON(!osb->s_sectsize_bits);
1987
1988         spin_lock_init(&osb->dc_task_lock);
1989         init_waitqueue_head(&osb->dc_event);
1990         osb->dc_work_sequence = 0;
1991         osb->dc_wake_sequence = 0;
1992         INIT_LIST_HEAD(&osb->blocked_lock_list);
1993         osb->blocked_lock_count = 0;
1994         spin_lock_init(&osb->osb_lock);
1995         spin_lock_init(&osb->osb_xattr_lock);
1996         ocfs2_init_inode_steal_slot(osb);
1997
1998         atomic_set(&osb->alloc_stats.moves, 0);
1999         atomic_set(&osb->alloc_stats.local_data, 0);
2000         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2001         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2002         atomic_set(&osb->alloc_stats.bg_extends, 0);
2003
2004         /* Copy the blockcheck stats from the superblock probe */
2005         osb->osb_ecc_stats = *stats;
2006
2007         ocfs2_init_node_maps(osb);
2008
2009         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2010                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2011
2012         ocfs2_orphan_scan_init(osb);
2013
2014         status = ocfs2_recovery_init(osb);
2015         if (status) {
2016                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2017                 mlog_errno(status);
2018                 goto bail;
2019         }
2020
2021         init_waitqueue_head(&osb->checkpoint_event);
2022         atomic_set(&osb->needs_checkpoint, 0);
2023
2024         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2025
2026         osb->slot_num = OCFS2_INVALID_SLOT;
2027
2028         osb->s_xattr_inline_size = le16_to_cpu(
2029                                         di->id2.i_super.s_xattr_inline_size);
2030
2031         osb->local_alloc_state = OCFS2_LA_UNUSED;
2032         osb->local_alloc_bh = NULL;
2033         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2034
2035         init_waitqueue_head(&osb->osb_mount_event);
2036
2037         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2038         if (!osb->vol_label) {
2039                 mlog(ML_ERROR, "unable to alloc vol label\n");
2040                 status = -ENOMEM;
2041                 goto bail;
2042         }
2043
2044         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2045         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2046                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2047                      osb->max_slots);
2048                 status = -EINVAL;
2049                 goto bail;
2050         }
2051         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2052
2053         osb->slot_recovery_generations =
2054                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2055                         GFP_KERNEL);
2056         if (!osb->slot_recovery_generations) {
2057                 status = -ENOMEM;
2058                 mlog_errno(status);
2059                 goto bail;
2060         }
2061
2062         init_waitqueue_head(&osb->osb_wipe_event);
2063         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2064                                         sizeof(*osb->osb_orphan_wipes),
2065                                         GFP_KERNEL);
2066         if (!osb->osb_orphan_wipes) {
2067                 status = -ENOMEM;
2068                 mlog_errno(status);
2069                 goto bail;
2070         }
2071
2072         osb->osb_rf_lock_tree = RB_ROOT;
2073
2074         osb->s_feature_compat =
2075                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2076         osb->s_feature_ro_compat =
2077                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2078         osb->s_feature_incompat =
2079                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2080
2081         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2082                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2083                      "optional features (%x).\n", i);
2084                 status = -EINVAL;
2085                 goto bail;
2086         }
2087         if (!(osb->sb->s_flags & MS_RDONLY) &&
2088             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2089                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2090                      "unsupported optional features (%x).\n", i);
2091                 status = -EINVAL;
2092                 goto bail;
2093         }
2094
2095         if (ocfs2_userspace_stack(osb)) {
2096                 memcpy(osb->osb_cluster_stack,
2097                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2098                        OCFS2_STACK_LABEL_LEN);
2099                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2100                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2101                         mlog(ML_ERROR,
2102                              "couldn't mount because of an invalid "
2103                              "cluster stack label (%s) \n",
2104                              osb->osb_cluster_stack);
2105                         status = -EINVAL;
2106                         goto bail;
2107                 }
2108         } else {
2109                 /* The empty string is identical with classic tools that
2110                  * don't know about s_cluster_info. */
2111                 osb->osb_cluster_stack[0] = '\0';
2112         }
2113
2114         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2115
2116         /* FIXME
2117          * This should be done in ocfs2_journal_init(), but unknown
2118          * ordering issues will cause the filesystem to crash.
2119          * If anyone wants to figure out what part of the code
2120          * refers to osb->journal before ocfs2_journal_init() is run,
2121          * be my guest.
2122          */
2123         /* initialize our journal structure */
2124
2125         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2126         if (!journal) {
2127                 mlog(ML_ERROR, "unable to alloc journal\n");
2128                 status = -ENOMEM;
2129                 goto bail;
2130         }
2131         osb->journal = journal;
2132         journal->j_osb = osb;
2133
2134         atomic_set(&journal->j_num_trans, 0);
2135         init_rwsem(&journal->j_trans_barrier);
2136         init_waitqueue_head(&journal->j_checkpointed);
2137         spin_lock_init(&journal->j_lock);
2138         journal->j_trans_id = (unsigned long) 1;
2139         INIT_LIST_HEAD(&journal->j_la_cleanups);
2140         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2141         journal->j_state = OCFS2_JOURNAL_FREE;
2142
2143         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2144         osb->dentry_lock_list = NULL;
2145
2146         /* get some pseudo constants for clustersize bits */
2147         osb->s_clustersize_bits =
2148                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2149         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2150         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2151
2152         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2153             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2154                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2155                      osb->s_clustersize);
2156                 status = -EINVAL;
2157                 goto bail;
2158         }
2159
2160         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2161             > (u32)~0UL) {
2162                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2163                      "what jbd can address in 32 bits.\n");
2164                 status = -EINVAL;
2165                 goto bail;
2166         }
2167
2168         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2169                                  sizeof(di->id2.i_super.s_uuid))) {
2170                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2171                 status = -ENOMEM;
2172                 goto bail;
2173         }
2174
2175         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2176
2177         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2178         osb->vol_label[63] = '\0';
2179         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2180         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2181         osb->first_cluster_group_blkno =
2182                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2183         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2184         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2185         mlog(0, "vol_label: %s\n", osb->vol_label);
2186         mlog(0, "uuid: %s\n", osb->uuid_str);
2187         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2188              (unsigned long long)osb->root_blkno,
2189              (unsigned long long)osb->system_dir_blkno);
2190
2191         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2192         if (!osb->osb_dlm_debug) {
2193                 status = -ENOMEM;
2194                 mlog_errno(status);
2195                 goto bail;
2196         }
2197
2198         atomic_set(&osb->vol_state, VOLUME_INIT);
2199
2200         /* load root, system_dir, and all global system inodes */
2201         status = ocfs2_init_global_system_inodes(osb);
2202         if (status < 0) {
2203                 mlog_errno(status);
2204                 goto bail;
2205         }
2206
2207         /*
2208          * global bitmap
2209          */
2210         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2211                                             OCFS2_INVALID_SLOT);
2212         if (!inode) {
2213                 status = -EINVAL;
2214                 mlog_errno(status);
2215                 goto bail;
2216         }
2217
2218         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2219         iput(inode);
2220
2221         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2222
2223         status = ocfs2_init_slot_info(osb);
2224         if (status < 0) {
2225                 mlog_errno(status);
2226                 goto bail;
2227         }
2228
2229 bail:
2230         mlog_exit(status);
2231         return status;
2232 }
2233
2234 /*
2235  * will return: -EAGAIN if it is ok to keep searching for superblocks
2236  *              -EINVAL if there is a bad superblock
2237  *              0 on success
2238  */
2239 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2240                                struct buffer_head *bh,
2241                                u32 blksz,
2242                                struct ocfs2_blockcheck_stats *stats)
2243 {
2244         int status = -EAGAIN;
2245
2246         mlog_entry_void();
2247
2248         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2249                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2250                 /* We have to do a raw check of the feature here */
2251                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2252                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2253                         status = ocfs2_block_check_validate(bh->b_data,
2254                                                             bh->b_size,
2255                                                             &di->i_check,
2256                                                             stats);
2257                         if (status)
2258                                 goto out;
2259                 }
2260                 status = -EINVAL;
2261                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2262                         mlog(ML_ERROR, "found superblock with incorrect block "
2263                              "size: found %u, should be %u\n",
2264                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2265                                blksz);
2266                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2267                            OCFS2_MAJOR_REV_LEVEL ||
2268                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2269                            OCFS2_MINOR_REV_LEVEL) {
2270                         mlog(ML_ERROR, "found superblock with bad version: "
2271                              "found %u.%u, should be %u.%u\n",
2272                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2273                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2274                              OCFS2_MAJOR_REV_LEVEL,
2275                              OCFS2_MINOR_REV_LEVEL);
2276                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2277                         mlog(ML_ERROR, "bad block number on superblock: "
2278                              "found %llu, should be %llu\n",
2279                              (unsigned long long)le64_to_cpu(di->i_blkno),
2280                              (unsigned long long)bh->b_blocknr);
2281                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2282                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2283                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2284                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2285                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2286                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2287                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2288                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2289                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2290                         mlog(ML_ERROR,
2291                              "Superblock slots found greater than file system "
2292                              "maximum: found %u, max %u\n",
2293                              le16_to_cpu(di->id2.i_super.s_max_slots),
2294                              OCFS2_MAX_SLOTS);
2295                 } else {
2296                         /* found it! */
2297                         status = 0;
2298                 }
2299         }
2300
2301 out:
2302         mlog_exit(status);
2303         return status;
2304 }
2305
2306 static int ocfs2_check_volume(struct ocfs2_super *osb)
2307 {
2308         int status;
2309         int dirty;
2310         int local;
2311         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2312                                                   * recover
2313                                                   * ourselves. */
2314
2315         mlog_entry_void();
2316
2317         /* Init our journal object. */
2318         status = ocfs2_journal_init(osb->journal, &dirty);
2319         if (status < 0) {
2320                 mlog(ML_ERROR, "Could not initialize journal!\n");
2321                 goto finally;
2322         }
2323
2324         /* If the journal was unmounted cleanly then we don't want to
2325          * recover anything. Otherwise, journal_load will do that
2326          * dirty work for us :) */
2327         if (!dirty) {
2328                 status = ocfs2_journal_wipe(osb->journal, 0);
2329                 if (status < 0) {
2330                         mlog_errno(status);
2331                         goto finally;
2332                 }
2333         } else {
2334                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2335                      "recovering volume.\n");
2336         }
2337
2338         local = ocfs2_mount_local(osb);
2339
2340         /* will play back anything left in the journal. */
2341         status = ocfs2_journal_load(osb->journal, local, dirty);
2342         if (status < 0) {
2343                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2344                 goto finally;
2345         }
2346
2347         if (dirty) {
2348                 /* recover my local alloc if we didn't unmount cleanly. */
2349                 status = ocfs2_begin_local_alloc_recovery(osb,
2350                                                           osb->slot_num,
2351                                                           &local_alloc);
2352                 if (status < 0) {
2353                         mlog_errno(status);
2354                         goto finally;
2355                 }
2356                 /* we complete the recovery process after we've marked
2357                  * ourselves as mounted. */
2358         }
2359
2360         mlog(0, "Journal loaded.\n");
2361
2362         status = ocfs2_load_local_alloc(osb);
2363         if (status < 0) {
2364                 mlog_errno(status);
2365                 goto finally;
2366         }
2367
2368         if (dirty) {
2369                 /* Recovery will be completed after we've mounted the
2370                  * rest of the volume. */
2371                 osb->dirty = 1;
2372                 osb->local_alloc_copy = local_alloc;
2373                 local_alloc = NULL;
2374         }
2375
2376         /* go through each journal, trylock it and if you get the
2377          * lock, and it's marked as dirty, set the bit in the recover
2378          * map and launch a recovery thread for it. */
2379         status = ocfs2_mark_dead_nodes(osb);
2380         if (status < 0) {
2381                 mlog_errno(status);
2382                 goto finally;
2383         }
2384
2385         status = ocfs2_compute_replay_slots(osb);
2386         if (status < 0)
2387                 mlog_errno(status);
2388
2389 finally:
2390         if (local_alloc)
2391                 kfree(local_alloc);
2392
2393         mlog_exit(status);
2394         return status;
2395 }
2396
2397 /*
2398  * The routine gets called from dismount or close whenever a dismount on
2399  * volume is requested and the osb open count becomes 1.
2400  * It will remove the osb from the global list and also free up all the
2401  * initialized resources and fileobject.
2402  */
2403 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2404 {
2405         mlog_entry_void();
2406
2407         /* This function assumes that the caller has the main osb resource */
2408
2409         ocfs2_free_slot_info(osb);
2410
2411         kfree(osb->osb_orphan_wipes);
2412         kfree(osb->slot_recovery_generations);
2413         /* FIXME
2414          * This belongs in journal shutdown, but because we have to
2415          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2416          * we free it here.
2417          */
2418         kfree(osb->journal);
2419         if (osb->local_alloc_copy)
2420                 kfree(osb->local_alloc_copy);
2421         kfree(osb->uuid_str);
2422         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2423         memset(osb, 0, sizeof(struct ocfs2_super));
2424
2425         mlog_exit_void();
2426 }
2427
2428 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2429  * panic(). We do not support continue-on-error operation. */
2430 static void ocfs2_handle_error(struct super_block *sb)
2431 {
2432         struct ocfs2_super *osb = OCFS2_SB(sb);
2433
2434         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2435                 panic("OCFS2: (device %s): panic forced after error\n",
2436                       sb->s_id);
2437
2438         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2439
2440         if (sb->s_flags & MS_RDONLY &&
2441             (ocfs2_is_soft_readonly(osb) ||
2442              ocfs2_is_hard_readonly(osb)))
2443                 return;
2444
2445         printk(KERN_CRIT "File system is now read-only due to the potential "
2446                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2447                "system is unmounted.\n");
2448         sb->s_flags |= MS_RDONLY;
2449         ocfs2_set_ro_flag(osb, 0);
2450 }
2451
2452 static char error_buf[1024];
2453
2454 void __ocfs2_error(struct super_block *sb,
2455                    const char *function,
2456                    const char *fmt, ...)
2457 {
2458         va_list args;
2459
2460         va_start(args, fmt);
2461         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2462         va_end(args);
2463
2464         /* Not using mlog here because we want to show the actual
2465          * function the error came from. */
2466         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2467                sb->s_id, function, error_buf);
2468
2469         ocfs2_handle_error(sb);
2470 }
2471
2472 /* Handle critical errors. This is intentionally more drastic than
2473  * ocfs2_handle_error, so we only use for things like journal errors,
2474  * etc. */
2475 void __ocfs2_abort(struct super_block* sb,
2476                    const char *function,
2477                    const char *fmt, ...)
2478 {
2479         va_list args;
2480
2481         va_start(args, fmt);
2482         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2483         va_end(args);
2484
2485         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2486                sb->s_id, function, error_buf);
2487
2488         /* We don't have the cluster support yet to go straight to
2489          * hard readonly in here. Until then, we want to keep
2490          * ocfs2_abort() so that we can at least mark critical
2491          * errors.
2492          *
2493          * TODO: This should abort the journal and alert other nodes
2494          * that our slot needs recovery. */
2495
2496         /* Force a panic(). This stinks, but it's better than letting
2497          * things continue without having a proper hard readonly
2498          * here. */
2499         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2500                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2501         ocfs2_handle_error(sb);
2502 }
2503
2504 module_init(ocfs2_init);
2505 module_exit(ocfs2_exit);