fs/ocfs2/super.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/utsname.h>
  32 #include <linux/init.h>
  33 #include <linux/random.h>
  34 #include <linux/statfs.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/socket.h>
  38 #include <linux/inet.h>
  39 #include <linux/parser.h>
  40 #include <linux/crc32.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/mount.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/quotaops.h>
  45 #include <linux/smp_lock.h>
  46
  47 #define MLOG_MASK_PREFIX ML_SUPER
  48 #include <cluster/masklog.h>
  49
  50 #include "ocfs2.h"
  51
  52 /* this should be the only file to include a version 1 header */
  53 #include "ocfs1_fs_compat.h"
  54
  55 #include "alloc.h"
  56 #include "blockcheck.h"
  57 #include "dlmglue.h"
  58 #include "export.h"
  59 #include "extent_map.h"
  60 #include "heartbeat.h"
  61 #include "inode.h"
  62 #include "journal.h"
  63 #include "localalloc.h"
  64 #include "namei.h"
  65 #include "slot_map.h"
  66 #include "super.h"
  67 #include "sysfile.h"
  68 #include "uptodate.h"
  69 #include "ver.h"
  70 #include "xattr.h"
  71 #include "quota.h"
  72
  73 #include "buffer_head_io.h"
  74
  75 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  76 struct kmem_cache *ocfs2_dquot_cachep;
  77 struct kmem_cache *ocfs2_qf_chunk_cachep;
  78
  79 /* OCFS2 needs to schedule several differnt types of work which
  80  * require cluster locking, disk I/O, recovery waits, etc. Since these
  81  * types of work tend to be heavy we avoid using the kernel events
  82  * workqueue and schedule on our own. */
  83 struct workqueue_struct *ocfs2_wq = NULL;
  84
  85 static struct dentry *ocfs2_debugfs_root = NULL;
  86
  87 MODULE_AUTHOR("Oracle");
  88 MODULE_LICENSE("GPL");
  89
  90 struct mount_options
  91 {
  92         unsigned long   commit_interval;
  93         unsigned long   mount_opt;
  94         unsigned int    atime_quantum;
  95         signed short    slot;
  96         unsigned int    localalloc_opt;
  97         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  98 };
  99
 100 static int ocfs2_parse_options(struct super_block *sb, char *options,
 101                                struct mount_options *mopt,
 102                                int is_remount);
 103 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 104 static void ocfs2_put_super(struct super_block *sb);
 105 static int ocfs2_mount_volume(struct super_block *sb);
 106 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 107 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 108 static int ocfs2_initialize_mem_caches(void);
 109 static void ocfs2_free_mem_caches(void);
 110 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 111
 112 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 113
 114 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 115
 116 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 117 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 118 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 119 static int ocfs2_check_volume(struct ocfs2_super *osb);
 120 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 121                                struct buffer_head *bh,
 122                                u32 sectsize,
 123                                struct ocfs2_blockcheck_stats *stats);
 124 static int ocfs2_initialize_super(struct super_block *sb,
 125                                   struct buffer_head *bh,
 126                                   int sector_size,
 127                                   struct ocfs2_blockcheck_stats *stats);
 128 static int ocfs2_get_sector(struct super_block *sb,
 129                             struct buffer_head **bh,
 130                             int block,
 131                             int sect_size);
 132 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 133 static void ocfs2_destroy_inode(struct inode *inode);
 134 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 135 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 136 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 137
 138 static const struct super_operations ocfs2_sops = {
 139         .statfs         = ocfs2_statfs,
 140         .alloc_inode    = ocfs2_alloc_inode,
 141         .destroy_inode  = ocfs2_destroy_inode,
 142         .drop_inode     = ocfs2_drop_inode,
 143         .clear_inode    = ocfs2_clear_inode,
 144         .delete_inode   = ocfs2_delete_inode,
 145         .sync_fs        = ocfs2_sync_fs,
 146         .put_super      = ocfs2_put_super,
 147         .remount_fs     = ocfs2_remount,
 148         .show_options   = ocfs2_show_options,
 149         .quota_read     = ocfs2_quota_read,
 150         .quota_write    = ocfs2_quota_write,
 151 };
 152
 153 enum {
 154         Opt_barrier,
 155         Opt_err_panic,
 156         Opt_err_ro,
 157         Opt_intr,
 158         Opt_nointr,
 159         Opt_hb_none,
 160         Opt_hb_local,
 161         Opt_data_ordered,
 162         Opt_data_writeback,
 163         Opt_atime_quantum,
 164         Opt_slot,
 165         Opt_commit,
 166         Opt_localalloc,
 167         Opt_localflocks,
 168         Opt_stack,
 169         Opt_user_xattr,
 170         Opt_nouser_xattr,
 171         Opt_inode64,
 172         Opt_acl,
 173         Opt_noacl,
 174         Opt_usrquota,
 175         Opt_grpquota,
 176         Opt_err,
 177 };
 178
 179 static const match_table_t tokens = {
 180         {Opt_barrier, "barrier=%u"},
 181         {Opt_err_panic, "errors=panic"},
 182         {Opt_err_ro, "errors=remount-ro"},
 183         {Opt_intr, "intr"},
 184         {Opt_nointr, "nointr"},
 185         {Opt_hb_none, OCFS2_HB_NONE},
 186         {Opt_hb_local, OCFS2_HB_LOCAL},
 187         {Opt_data_ordered, "data=ordered"},
 188         {Opt_data_writeback, "data=writeback"},
 189         {Opt_atime_quantum, "atime_quantum=%u"},
 190         {Opt_slot, "preferred_slot=%u"},
 191         {Opt_commit, "commit=%u"},
 192         {Opt_localalloc, "localalloc=%d"},
 193         {Opt_localflocks, "localflocks"},
 194         {Opt_stack, "cluster_stack=%s"},
 195         {Opt_user_xattr, "user_xattr"},
 196         {Opt_nouser_xattr, "nouser_xattr"},
 197         {Opt_inode64, "inode64"},
 198         {Opt_acl, "acl"},
 199         {Opt_noacl, "noacl"},
 200         {Opt_usrquota, "usrquota"},
 201         {Opt_grpquota, "grpquota"},
 202         {Opt_err, NULL}
 203 };
 204
 205 #ifdef CONFIG_DEBUG_FS
 206 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 207 {
 208         struct ocfs2_cluster_connection *cconn = osb->cconn;
 209         struct ocfs2_recovery_map *rm = osb->recovery_map;
 210         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
 211         int i, out = 0;
 212
 213         out += snprintf(buf + out, len - out,
 214                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
 215                         "Device", osb->dev_str, osb->uuid_str,
 216                         osb->fs_generation, osb->vol_label);
 217
 218         out += snprintf(buf + out, len - out,
 219                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
 220                         atomic_read(&osb->vol_state), osb->osb_flags);
 221
 222         out += snprintf(buf + out, len - out,
 223                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
 224                         osb->sb->s_blocksize, osb->s_clustersize);
 225
 226         out += snprintf(buf + out, len - out,
 227                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
 228                         "ROcompat: 0x%X\n",
 229                         "Features", osb->s_feature_compat,
 230                         osb->s_feature_incompat, osb->s_feature_ro_compat);
 231
 232         out += snprintf(buf + out, len - out,
 233                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
 234                         osb->s_mount_opt, osb->s_atime_quantum);
 235
 236         if (cconn) {
 237                 out += snprintf(buf + out, len - out,
 238                                 "%10s => Stack: %s  Name: %*s  "
 239                                 "Version: %d.%d\n", "Cluster",
 240                                 (*osb->osb_cluster_stack == '\0' ?
 241                                  "o2cb" : osb->osb_cluster_stack),
 242                                 cconn->cc_namelen, cconn->cc_name,
 243                                 cconn->cc_version.pv_major,
 244                                 cconn->cc_version.pv_minor);
 245         }
 246
 247         spin_lock(&osb->dc_task_lock);
 248         out += snprintf(buf + out, len - out,
 249                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
 250                         "WorkSeq: %lu\n", "DownCnvt",
 251                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
 252                         osb->blocked_lock_count, osb->dc_wake_sequence,
 253                         osb->dc_work_sequence);
 254         spin_unlock(&osb->dc_task_lock);
 255
 256         spin_lock(&osb->osb_lock);
 257         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
 258                         "Recovery",
 259                         (osb->recovery_thread_task ?
 260                          task_pid_nr(osb->recovery_thread_task) : -1));
 261         if (rm->rm_used == 0)
 262                 out += snprintf(buf + out, len - out, " None\n");
 263         else {
 264                 for (i = 0; i < rm->rm_used; i++)
 265                         out += snprintf(buf + out, len - out, " %d",
 266                                         rm->rm_entries[i]);
 267                 out += snprintf(buf + out, len - out, "\n");
 268         }
 269         spin_unlock(&osb->osb_lock);
 270
 271         out += snprintf(buf + out, len - out,
 272                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
 273                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
 274                         osb->osb_commit_interval,
 275                         atomic_read(&osb->needs_checkpoint));
 276
 277         out += snprintf(buf + out, len - out,
 278                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
 279                         "Journal", osb->journal->j_state,
 280                         osb->journal->j_trans_id,
 281                         atomic_read(&osb->journal->j_num_trans));
 282
 283         out += snprintf(buf + out, len - out,
 284                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
 285                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
 286                         "Stats",
 287                         atomic_read(&osb->alloc_stats.bitmap_data),
 288                         atomic_read(&osb->alloc_stats.local_data),
 289                         atomic_read(&osb->alloc_stats.bg_allocs),
 290                         atomic_read(&osb->alloc_stats.moves),
 291                         atomic_read(&osb->alloc_stats.bg_extends));
 292
 293         out += snprintf(buf + out, len - out,
 294                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
 295                         "Default: %u bits\n",
 296                         "LocalAlloc", osb->local_alloc_state,
 297                         (unsigned long long)osb->la_last_gd,
 298                         osb->local_alloc_bits, osb->local_alloc_default_bits);
 299
 300         spin_lock(&osb->osb_lock);
 301         out += snprintf(buf + out, len - out,
 302                         "%10s => Slot: %d  NumStolen: %d\n", "Steal",
 303                         osb->s_inode_steal_slot,
 304                         atomic_read(&osb->s_num_inodes_stolen));
 305         spin_unlock(&osb->osb_lock);
 306
 307         out += snprintf(buf + out, len - out, "OrphanScan => ");
 308         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
 309                         os->os_count, os->os_seqno);
 310         out += snprintf(buf + out, len - out, " Last Scan: ");
 311         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
 312                 out += snprintf(buf + out, len - out, "Disabled\n");
 313         else
 314                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
 315                                 (get_seconds() - os->os_scantime.tv_sec));
 316
 317         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
 318                         "Slots", "Num", "RecoGen");
 319         for (i = 0; i < osb->max_slots; ++i) {
 320                 out += snprintf(buf + out, len - out,
 321                                 "%10s  %c %3d  %10d\n",
 322                                 " ",
 323                                 (i == osb->slot_num ? '*' : ' '),
 324                                 i, osb->slot_recovery_generations[i]);
 325         }
 326
 327         return out;
 328 }
 329
 330 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 331 {
 332         struct ocfs2_super *osb = inode->i_private;
 333         char *buf = NULL;
 334
 335         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 336         if (!buf)
 337                 goto bail;
 338
 339         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 340
 341         file->private_data = buf;
 342
 343         return 0;
 344 bail:
 345         return -ENOMEM;
 346 }
 347
 348 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 349 {
 350         kfree(file->private_data);
 351         return 0;
 352 }
 353
 354 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 355                                 size_t nbytes, loff_t *ppos)
 356 {
 357         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
 358                                        i_size_read(file->f_mapping->host));
 359 }
 360 #else
 361 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 362 {
 363         return 0;
 364 }
 365 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 366 {
 367         return 0;
 368 }
 369 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 370                                 size_t nbytes, loff_t *ppos)
 371 {
 372         return 0;
 373 }
 374 #endif  /* CONFIG_DEBUG_FS */
 375
 376 static struct file_operations ocfs2_osb_debug_fops = {
 377         .open =         ocfs2_osb_debug_open,
 378         .release =      ocfs2_debug_release,
 379         .read =         ocfs2_debug_read,
 380         .llseek =       generic_file_llseek,
 381 };
 382
 383 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 384 {
 385         int status;
 386         tid_t target;
 387         struct ocfs2_super *osb = OCFS2_SB(sb);
 388
 389         if (ocfs2_is_hard_readonly(osb))
 390                 return -EROFS;
 391
 392         if (wait) {
 393                 status = ocfs2_flush_truncate_log(osb);
 394                 if (status < 0)
 395                         mlog_errno(status);
 396         } else {
 397                 ocfs2_schedule_truncate_log_flush(osb, 0);
 398         }
 399
 400         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 401                                       &target)) {
 402                 if (wait)
 403                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 404                                              target);
 405         }
 406         return 0;
 407 }
 408
 409 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 410 {
 411         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 412             && (ino == USER_QUOTA_SYSTEM_INODE
 413                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 414                 return 0;
 415         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 416             && (ino == GROUP_QUOTA_SYSTEM_INODE
 417                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 418                 return 0;
 419         return 1;
 420 }
 421
 422 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 423 {
 424         struct inode *new = NULL;
 425         int status = 0;
 426         int i;
 427
 428         mlog_entry_void();
 429
 430         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 431         if (IS_ERR(new)) {
 432                 status = PTR_ERR(new);
 433                 mlog_errno(status);
 434                 goto bail;
 435         }
 436         osb->root_inode = new;
 437
 438         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 439         if (IS_ERR(new)) {
 440                 status = PTR_ERR(new);
 441                 mlog_errno(status);
 442                 goto bail;
 443         }
 444         osb->sys_root_inode = new;
 445
 446         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 447              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 448                 if (!ocfs2_need_system_inode(osb, i))
 449                         continue;
 450                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 451                 if (!new) {
 452                         ocfs2_release_system_inodes(osb);
 453                         status = -EINVAL;
 454                         mlog_errno(status);
 455                         /* FIXME: Should ERROR_RO_FS */
 456                         mlog(ML_ERROR, "Unable to load system inode %d, "
 457                              "possibly corrupt fs?", i);
 458                         goto bail;
 459                 }
 460                 // the array now has one ref, so drop this one
 461                 iput(new);
 462         }
 463
 464 bail:
 465         mlog_exit(status);
 466         return status;
 467 }
 468
 469 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 470 {
 471         struct inode *new = NULL;
 472         int status = 0;
 473         int i;
 474
 475         mlog_entry_void();
 476
 477         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 478              i < NUM_SYSTEM_INODES;
 479              i++) {
 480                 if (!ocfs2_need_system_inode(osb, i))
 481                         continue;
 482                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 483                 if (!new) {
 484                         ocfs2_release_system_inodes(osb);
 485                         status = -EINVAL;
 486                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 487                              status, i, osb->slot_num);
 488                         goto bail;
 489                 }
 490                 /* the array now has one ref, so drop this one */
 491                 iput(new);
 492         }
 493
 494 bail:
 495         mlog_exit(status);
 496         return status;
 497 }
 498
 499 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 500 {
 501         int i;
 502         struct inode *inode;
 503
 504         mlog_entry_void();
 505
 506         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 507                 inode = osb->system_inodes[i];
 508                 if (inode) {
 509                         iput(inode);
 510                         osb->system_inodes[i] = NULL;
 511                 }
 512         }
 513
 514         inode = osb->sys_root_inode;
 515         if (inode) {
 516                 iput(inode);
 517                 osb->sys_root_inode = NULL;
 518         }
 519
 520         inode = osb->root_inode;
 521         if (inode) {
 522                 iput(inode);
 523                 osb->root_inode = NULL;
 524         }
 525
 526         mlog_exit(0);
 527 }
 528
 529 /* We're allocating fs objects, use GFP_NOFS */
 530 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 531 {
 532         struct ocfs2_inode_info *oi;
 533
 534         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 535         if (!oi)
 536                 return NULL;
 537
 538         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 539         return &oi->vfs_inode;
 540 }
 541
 542 static void ocfs2_destroy_inode(struct inode *inode)
 543 {
 544         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 545 }
 546
 547 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 548                                                 unsigned int cbits)
 549 {
 550         unsigned int bytes = 1 << cbits;
 551         unsigned int trim = bytes;
 552         unsigned int bitshift = 32;
 553
 554         /*
 555          * i_size and all block offsets in ocfs2 are always 64 bits
 556          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 557          * 64 bit platforms, cluster size will be the limiting factor.
 558          */
 559
 560 #if BITS_PER_LONG == 32
 561 # if defined(CONFIG_LBDAF)
 562         BUILD_BUG_ON(sizeof(sector_t) != 8);
 563         /*
 564          * We might be limited by page cache size.
 565          */
 566         if (bytes > PAGE_CACHE_SIZE) {
 567                 bytes = PAGE_CACHE_SIZE;
 568                 trim = 1;
 569                 /*
 570                  * Shift by 31 here so that we don't get larger than
 571                  * MAX_LFS_FILESIZE
 572                  */
 573                 bitshift = 31;
 574         }
 575 # else
 576         /*
 577          * We are limited by the size of sector_t. Use block size, as
 578          * that's what we expose to the VFS.
 579          */
 580         bytes = 1 << bbits;
 581         trim = 1;
 582         bitshift = 31;
 583 # endif
 584 #endif
 585
 586         /*
 587          * Trim by a whole cluster when we can actually approach the
 588          * on-disk limits. Otherwise we can overflow i_clusters when
 589          * an extent start is at the max offset.
 590          */
 591         return (((unsigned long long)bytes) << bitshift) - trim;
 592 }
 593
 594 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 595 {
 596         int incompat_features;
 597         int ret = 0;
 598         struct mount_options parsed_options;
 599         struct ocfs2_super *osb = OCFS2_SB(sb);
 600
 601         lock_kernel();
 602
 603         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 604                 ret = -EINVAL;
 605                 goto out;
 606         }
 607
 608         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 609             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 610                 ret = -EINVAL;
 611                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 612                 goto out;
 613         }
 614
 615         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 616             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 617                 ret = -EINVAL;
 618                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 619                 goto out;
 620         }
 621
 622         /* Probably don't want this on remount; it might
 623          * mess with other nodes */
 624         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 625             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 626                 ret = -EINVAL;
 627                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 628                 goto out;
 629         }
 630
 631         /* We're going to/from readonly mode. */
 632         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 633                 /* Disable quota accounting before remounting RO */
 634                 if (*flags & MS_RDONLY) {
 635                         ret = ocfs2_susp_quotas(osb, 0);
 636                         if (ret < 0)
 637                                 goto out;
 638                 }
 639                 /* Lock here so the check of HARD_RO and the potential
 640                  * setting of SOFT_RO is atomic. */
 641                 spin_lock(&osb->osb_lock);
 642                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 643                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 644                         ret = -EROFS;
 645                         goto unlock_osb;
 646                 }
 647
 648                 if (*flags & MS_RDONLY) {
 649                         mlog(0, "Going to ro mode.\n");
 650                         sb->s_flags |= MS_RDONLY;
 651                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 652                 } else {
 653                         mlog(0, "Making ro filesystem writeable.\n");
 654
 655                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 656                                 mlog(ML_ERROR, "Cannot remount RDWR "
 657                                      "filesystem due to previous errors.\n");
 658                                 ret = -EROFS;
 659                                 goto unlock_osb;
 660                         }
 661                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 662                         if (incompat_features) {
 663                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 664                                      "of unsupported optional features "
 665                                      "(%x).\n", incompat_features);
 666                                 ret = -EINVAL;
 667                                 goto unlock_osb;
 668                         }
 669                         sb->s_flags &= ~MS_RDONLY;
 670                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 671                 }
 672 unlock_osb:
 673                 spin_unlock(&osb->osb_lock);
 674                 /* Enable quota accounting after remounting RW */
 675                 if (!ret && !(*flags & MS_RDONLY)) {
 676                         if (sb_any_quota_suspended(sb))
 677                                 ret = ocfs2_susp_quotas(osb, 1);
 678                         else
 679                                 ret = ocfs2_enable_quotas(osb);
 680                         if (ret < 0) {
 681                                 /* Return back changes... */
 682                                 spin_lock(&osb->osb_lock);
 683                                 sb->s_flags |= MS_RDONLY;
 684                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 685                                 spin_unlock(&osb->osb_lock);
 686                                 goto out;
 687                         }
 688                 }
 689         }
 690
 691         if (!ret) {
 692                 /* Only save off the new mount options in case of a successful
 693                  * remount. */
 694                 if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 695                         parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 696                 osb->s_mount_opt = parsed_options.mount_opt;
 697                 osb->s_atime_quantum = parsed_options.atime_quantum;
 698                 osb->preferred_slot = parsed_options.slot;
 699                 if (parsed_options.commit_interval)
 700                         osb->osb_commit_interval = parsed_options.commit_interval;
 701
 702                 if (!ocfs2_is_hard_readonly(osb))
 703                         ocfs2_set_journal_params(osb);
 704         }
 705 out:
 706         unlock_kernel();
 707         return ret;
 708 }
 709
 710 static int ocfs2_sb_probe(struct super_block *sb,
 711                           struct buffer_head **bh,
 712                           int *sector_size,
 713                           struct ocfs2_blockcheck_stats *stats)
 714 {
 715         int status, tmpstat;
 716         struct ocfs1_vol_disk_hdr *hdr;
 717         struct ocfs2_dinode *di;
 718         int blksize;
 719
 720         *bh = NULL;
 721
 722         /* may be > 512 */
 723         *sector_size = bdev_logical_block_size(sb->s_bdev);
 724         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 725                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 726                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 727                 status = -EINVAL;
 728                 goto bail;
 729         }
 730
 731         /* Can this really happen? */
 732         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 733                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 734
 735         /* check block zero for old format */
 736         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 737         if (status < 0) {
 738                 mlog_errno(status);
 739                 goto bail;
 740         }
 741         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 742         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 743                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 744                      hdr->major_version, hdr->minor_version);
 745                 status = -EINVAL;
 746         }
 747         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 748                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 749                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 750                      hdr->signature);
 751                 status = -EINVAL;
 752         }
 753         brelse(*bh);
 754         *bh = NULL;
 755         if (status < 0) {
 756                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 757                      "upgraded before mounting with ocfs v2\n");
 758                 goto bail;
 759         }
 760
 761         /*
 762          * Now check at magic offset for 512, 1024, 2048, 4096
 763          * blocksizes.  4096 is the maximum blocksize because it is
 764          * the minimum clustersize.
 765          */
 766         status = -EINVAL;
 767         for (blksize = *sector_size;
 768              blksize <= OCFS2_MAX_BLOCKSIZE;
 769              blksize <<= 1) {
 770                 tmpstat = ocfs2_get_sector(sb, bh,
 771                                            OCFS2_SUPER_BLOCK_BLKNO,
 772                                            blksize);
 773                 if (tmpstat < 0) {
 774                         status = tmpstat;
 775                         mlog_errno(status);
 776                         goto bail;
 777                 }
 778                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 779                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
 780                 spin_lock_init(&stats->b_lock);
 781                 status = ocfs2_verify_volume(di, *bh, blksize, stats);
 782                 if (status >= 0)
 783                         goto bail;
 784                 brelse(*bh);
 785                 *bh = NULL;
 786                 if (status != -EAGAIN)
 787                         break;
 788         }
 789
 790 bail:
 791         return status;
 792 }
 793
 794 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 795 {
 796         if (ocfs2_mount_local(osb)) {
 797                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 798                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 799                              "mounted device.\n");
 800                         return -EINVAL;
 801                 }
 802         }
 803
 804         if (ocfs2_userspace_stack(osb)) {
 805                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 806                         mlog(ML_ERROR, "Userspace stack expected, but "
 807                              "o2cb heartbeat arguments passed to mount\n");
 808                         return -EINVAL;
 809                 }
 810         }
 811
 812         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 813                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 814                     !ocfs2_userspace_stack(osb)) {
 815                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 816                              "a read-write clustered device.\n");
 817                         return -EINVAL;
 818                 }
 819         }
 820
 821         return 0;
 822 }
 823
 824 /*
 825  * If we're using a userspace stack, mount should have passed
 826  * a name that matches the disk.  If not, mount should not
 827  * have passed a stack.
 828  */
 829 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 830                                         struct mount_options *mopt)
 831 {
 832         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 833                 mlog(ML_ERROR,
 834                      "cluster stack passed to mount, but this filesystem "
 835                      "does not support it\n");
 836                 return -EINVAL;
 837         }
 838
 839         if (ocfs2_userspace_stack(osb) &&
 840             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 841                     OCFS2_STACK_LABEL_LEN)) {
 842                 mlog(ML_ERROR,
 843                      "cluster stack passed to mount (\"%s\") does not "
 844                      "match the filesystem (\"%s\")\n",
 845                      mopt->cluster_stack,
 846                      osb->osb_cluster_stack);
 847                 return -EINVAL;
 848         }
 849
 850         return 0;
 851 }
 852
 853 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 854 {
 855         int type;
 856         struct super_block *sb = osb->sb;
 857         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 858                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 859         int status = 0;
 860
 861         for (type = 0; type < MAXQUOTAS; type++) {
 862                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 863                         continue;
 864                 if (unsuspend)
 865                         status = vfs_quota_enable(
 866                                         sb_dqopt(sb)->files[type],
 867                                         type, QFMT_OCFS2,
 868                                         DQUOT_SUSPENDED);
 869                 else
 870                         status = vfs_quota_disable(sb, type,
 871                                                    DQUOT_SUSPENDED);
 872                 if (status < 0)
 873                         break;
 874         }
 875         if (status < 0)
 876                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
 877                      "remount (error = %d).\n", status);
 878         return status;
 879 }
 880
 881 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 882 {
 883         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
 884         struct super_block *sb = osb->sb;
 885         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 886                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 887         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 888                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 889         int status;
 890         int type;
 891
 892         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
 893         for (type = 0; type < MAXQUOTAS; type++) {
 894                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 895                         continue;
 896                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
 897                                                         osb->slot_num);
 898                 if (!inode[type]) {
 899                         status = -ENOENT;
 900                         goto out_quota_off;
 901                 }
 902                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
 903                                                 DQUOT_USAGE_ENABLED);
 904                 if (status < 0)
 905                         goto out_quota_off;
 906         }
 907
 908         for (type = 0; type < MAXQUOTAS; type++)
 909                 iput(inode[type]);
 910         return 0;
 911 out_quota_off:
 912         ocfs2_disable_quotas(osb);
 913         for (type = 0; type < MAXQUOTAS; type++)
 914                 iput(inode[type]);
 915         mlog_errno(status);
 916         return status;
 917 }
 918
 919 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 920 {
 921         int type;
 922         struct inode *inode;
 923         struct super_block *sb = osb->sb;
 924
 925         /* We mostly ignore errors in this function because there's not much
 926          * we can do when we see them */
 927         for (type = 0; type < MAXQUOTAS; type++) {
 928                 if (!sb_has_quota_loaded(sb, type))
 929                         continue;
 930                 inode = igrab(sb->s_dquot.files[type]);
 931                 /* Turn off quotas. This will remove all dquot structures from
 932                  * memory and so they will be automatically synced to global
 933                  * quota files */
 934                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
 935                                             DQUOT_LIMITS_ENABLED);
 936                 if (!inode)
 937                         continue;
 938                 iput(inode);
 939         }
 940 }
 941
 942 /* Handle quota on quotactl */
 943 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
 944                           char *path, int remount)
 945 {
 946         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 947                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 948
 949         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 950                 return -EINVAL;
 951
 952         if (remount)
 953                 return 0;       /* Just ignore it has been handled in
 954                                  * ocfs2_remount() */
 955         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
 956                                     format_id, DQUOT_LIMITS_ENABLED);
 957 }
 958
 959 /* Handle quota off quotactl */
 960 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
 961 {
 962         if (remount)
 963                 return 0;       /* Ignore now and handle later in
 964                                  * ocfs2_remount() */
 965         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 966 }
 967
 968 static struct quotactl_ops ocfs2_quotactl_ops = {
 969         .quota_on       = ocfs2_quota_on,
 970         .quota_off      = ocfs2_quota_off,
 971         .quota_sync     = vfs_quota_sync,
 972         .get_info       = vfs_get_dqinfo,
 973         .set_info       = vfs_set_dqinfo,
 974         .get_dqblk      = vfs_get_dqblk,
 975         .set_dqblk      = vfs_set_dqblk,
 976 };
 977
 978 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 979 {
 980         struct dentry *root;
 981         int status, sector_size;
 982         struct mount_options parsed_options;
 983         struct inode *inode = NULL;
 984         struct ocfs2_super *osb = NULL;
 985         struct buffer_head *bh = NULL;
 986         char nodestr[8];
 987         struct ocfs2_blockcheck_stats stats;
 988
 989         mlog_entry("%p, %p, %i", sb, data, silent);
 990
 991         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 992                 status = -EINVAL;
 993                 goto read_super_error;
 994         }
 995
 996         /* probe for superblock */
 997         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
 998         if (status < 0) {
 999                 mlog(ML_ERROR, "superblock probe failed!\n");
1000                 goto read_super_error;
1001         }
1002
1003         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1004         osb = OCFS2_SB(sb);
1005         if (status < 0) {
1006                 mlog_errno(status);
1007                 goto read_super_error;
1008         }
1009         brelse(bh);
1010         bh = NULL;
1011
1012         if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
1013                 parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1014
1015         osb->s_mount_opt = parsed_options.mount_opt;
1016         osb->s_atime_quantum = parsed_options.atime_quantum;
1017         osb->preferred_slot = parsed_options.slot;
1018         osb->osb_commit_interval = parsed_options.commit_interval;
1019         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1020         osb->local_alloc_bits = osb->local_alloc_default_bits;
1021         if (osb->s_mount_opt & OCFS2_MOUNT_USRQUOTA &&
1022             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1023                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1024                 status = -EINVAL;
1025                 mlog(ML_ERROR, "User quotas were requested, but this "
1026                      "filesystem does not have the feature enabled.\n");
1027                 goto read_super_error;
1028         }
1029         if (osb->s_mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1030             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1031                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1032                 status = -EINVAL;
1033                 mlog(ML_ERROR, "Group quotas were requested, but this "
1034                      "filesystem does not have the feature enabled.\n");
1035                 goto read_super_error;
1036         }
1037
1038         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1039         if (status)
1040                 goto read_super_error;
1041
1042         sb->s_magic = OCFS2_SUPER_MAGIC;
1043
1044         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1045                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1046
1047         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1048          * heartbeat=none */
1049         if (bdev_read_only(sb->s_bdev)) {
1050                 if (!(sb->s_flags & MS_RDONLY)) {
1051                         status = -EACCES;
1052                         mlog(ML_ERROR, "Readonly device detected but readonly "
1053                              "mount was not specified.\n");
1054                         goto read_super_error;
1055                 }
1056
1057                 /* You should not be able to start a local heartbeat
1058                  * on a readonly device. */
1059                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1060                         status = -EROFS;
1061                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1062                              "device.\n");
1063                         goto read_super_error;
1064                 }
1065
1066                 status = ocfs2_check_journals_nolocks(osb);
1067                 if (status < 0) {
1068                         if (status == -EROFS)
1069                                 mlog(ML_ERROR, "Recovery required on readonly "
1070                                      "file system, but write access is "
1071                                      "unavailable.\n");
1072                         else
1073                                 mlog_errno(status);
1074                         goto read_super_error;
1075                 }
1076
1077                 ocfs2_set_ro_flag(osb, 1);
1078
1079                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1080                        "services will be utilized for this mount. Recovery "
1081                        "will be skipped.\n");
1082         }
1083
1084         if (!ocfs2_is_hard_readonly(osb)) {
1085                 if (sb->s_flags & MS_RDONLY)
1086                         ocfs2_set_ro_flag(osb, 0);
1087         }
1088
1089         status = ocfs2_verify_heartbeat(osb);
1090         if (status < 0) {
1091                 mlog_errno(status);
1092                 goto read_super_error;
1093         }
1094
1095         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1096                                                  ocfs2_debugfs_root);
1097         if (!osb->osb_debug_root) {
1098                 status = -EINVAL;
1099                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1100                 goto read_super_error;
1101         }
1102
1103         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1104                                             osb->osb_debug_root,
1105                                             osb,
1106                                             &ocfs2_osb_debug_fops);
1107         if (!osb->osb_ctxt) {
1108                 status = -EINVAL;
1109                 mlog_errno(status);
1110                 goto read_super_error;
1111         }
1112
1113         if (ocfs2_meta_ecc(osb)) {
1114                 status = ocfs2_blockcheck_stats_debugfs_install(
1115                                                 &osb->osb_ecc_stats,
1116                                                 osb->osb_debug_root);
1117                 if (status) {
1118                         mlog(ML_ERROR,
1119                              "Unable to create blockcheck statistics "
1120                              "files\n");
1121                         goto read_super_error;
1122                 }
1123         }
1124
1125         status = ocfs2_mount_volume(sb);
1126         if (osb->root_inode)
1127                 inode = igrab(osb->root_inode);
1128
1129         if (status < 0)
1130                 goto read_super_error;
1131
1132         if (!inode) {
1133                 status = -EIO;
1134                 mlog_errno(status);
1135                 goto read_super_error;
1136         }
1137
1138         root = d_alloc_root(inode);
1139         if (!root) {
1140                 status = -ENOMEM;
1141                 mlog_errno(status);
1142                 goto read_super_error;
1143         }
1144
1145         sb->s_root = root;
1146
1147         ocfs2_complete_mount_recovery(osb);
1148
1149         if (ocfs2_mount_local(osb))
1150                 snprintf(nodestr, sizeof(nodestr), "local");
1151         else
1152                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1153
1154         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1155                "with %s data mode.\n",
1156                osb->dev_str, nodestr, osb->slot_num,
1157                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1158                "ordered");
1159
1160         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1161         wake_up(&osb->osb_mount_event);
1162
1163         /* Now we can initialize quotas because we can afford to wait
1164          * for cluster locks recovery now. That also means that truncation
1165          * log recovery can happen but that waits for proper quota setup */
1166         if (!(sb->s_flags & MS_RDONLY)) {
1167                 status = ocfs2_enable_quotas(osb);
1168                 if (status < 0) {
1169                         /* We have to err-out specially here because
1170                          * s_root is already set */
1171                         mlog_errno(status);
1172                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1173                         wake_up(&osb->osb_mount_event);
1174                         mlog_exit(status);
1175                         return status;
1176                 }
1177         }
1178
1179         ocfs2_complete_quota_recovery(osb);
1180
1181         /* Now we wake up again for processes waiting for quotas */
1182         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1183         wake_up(&osb->osb_mount_event);
1184
1185         /* Start this when the mount is almost sure of being successful */
1186         ocfs2_orphan_scan_start(osb);
1187
1188         mlog_exit(status);
1189         return status;
1190
1191 read_super_error:
1192         brelse(bh);
1193
1194         if (inode)
1195                 iput(inode);
1196
1197         if (osb) {
1198                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1199                 wake_up(&osb->osb_mount_event);
1200                 ocfs2_dismount_volume(sb, 1);
1201         }
1202
1203         mlog_exit(status);
1204         return status;
1205 }
1206
1207 static int ocfs2_get_sb(struct file_system_type *fs_type,
1208                         int flags,
1209                         const char *dev_name,
1210                         void *data,
1211                         struct vfsmount *mnt)
1212 {
1213         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1214                            mnt);
1215 }
1216
1217 static void ocfs2_kill_sb(struct super_block *sb)
1218 {
1219         struct ocfs2_super *osb = OCFS2_SB(sb);
1220
1221         /* Failed mount? */
1222         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1223                 goto out;
1224
1225         /* Prevent further queueing of inode drop events */
1226         spin_lock(&dentry_list_lock);
1227         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1228         spin_unlock(&dentry_list_lock);
1229         /* Wait for work to finish and/or remove it */
1230         cancel_work_sync(&osb->dentry_lock_work);
1231 out:
1232         kill_block_super(sb);
1233 }
1234
1235 static struct file_system_type ocfs2_fs_type = {
1236         .owner          = THIS_MODULE,
1237         .name           = "ocfs2",
1238         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1239                                         * the fs? */
1240         .kill_sb        = ocfs2_kill_sb,
1241
1242         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1243         .next           = NULL
1244 };
1245
1246 static int ocfs2_parse_options(struct super_block *sb,
1247                                char *options,
1248                                struct mount_options *mopt,
1249                                int is_remount)
1250 {
1251         int status;
1252         char *p;
1253
1254         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1255                    options ? options : "(none)");
1256
1257         mopt->commit_interval = 0;
1258         mopt->mount_opt = 0;
1259         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1260         mopt->slot = OCFS2_INVALID_SLOT;
1261         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1262         mopt->cluster_stack[0] = '\0';
1263
1264         if (!options) {
1265                 status = 1;
1266                 goto bail;
1267         }
1268
1269         while ((p = strsep(&options, ",")) != NULL) {
1270                 int token, option;
1271                 substring_t args[MAX_OPT_ARGS];
1272
1273                 if (!*p)
1274                         continue;
1275
1276                 token = match_token(p, tokens, args);
1277                 switch (token) {
1278                 case Opt_hb_local:
1279                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1280                         break;
1281                 case Opt_hb_none:
1282                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1283                         break;
1284                 case Opt_barrier:
1285                         if (match_int(&args[0], &option)) {
1286                                 status = 0;
1287                                 goto bail;
1288                         }
1289                         if (option)
1290                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1291                         else
1292                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1293                         break;
1294                 case Opt_intr:
1295                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1296                         break;
1297                 case Opt_nointr:
1298                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1299                         break;
1300                 case Opt_err_panic:
1301                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1302                         break;
1303                 case Opt_err_ro:
1304                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1305                         break;
1306                 case Opt_data_ordered:
1307                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1308                         break;
1309                 case Opt_data_writeback:
1310                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1311                         break;
1312                 case Opt_user_xattr:
1313                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1314                         break;
1315                 case Opt_nouser_xattr:
1316                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1317                         break;
1318                 case Opt_atime_quantum:
1319                         if (match_int(&args[0], &option)) {
1320                                 status = 0;
1321                                 goto bail;
1322                         }
1323                         if (option >= 0)
1324                                 mopt->atime_quantum = option;
1325                         break;
1326                 case Opt_slot:
1327                         option = 0;
1328                         if (match_int(&args[0], &option)) {
1329                                 status = 0;
1330                                 goto bail;
1331                         }
1332                         if (option)
1333                                 mopt->slot = (s16)option;
1334                         break;
1335                 case Opt_commit:
1336                         option = 0;
1337                         if (match_int(&args[0], &option)) {
1338                                 status = 0;
1339                                 goto bail;
1340                         }
1341                         if (option < 0)
1342                                 return 0;
1343                         if (option == 0)
1344                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1345                         mopt->commit_interval = HZ * option;
1346                         break;
1347                 case Opt_localalloc:
1348                         option = 0;
1349                         if (match_int(&args[0], &option)) {
1350                                 status = 0;
1351                                 goto bail;
1352                         }
1353                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1354                                 mopt->localalloc_opt = option;
1355                         break;
1356                 case Opt_localflocks:
1357                         /*
1358                          * Changing this during remount could race
1359                          * flock() requests, or "unbalance" existing
1360                          * ones (e.g., a lock is taken in one mode but
1361                          * dropped in the other). If users care enough
1362                          * to flip locking modes during remount, we
1363                          * could add a "local" flag to individual
1364                          * flock structures for proper tracking of
1365                          * state.
1366                          */
1367                         if (!is_remount)
1368                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1369                         break;
1370                 case Opt_stack:
1371                         /* Check both that the option we were passed
1372                          * is of the right length and that it is a proper
1373                          * string of the right length.
1374                          */
1375                         if (((args[0].to - args[0].from) !=
1376                              OCFS2_STACK_LABEL_LEN) ||
1377                             (strnlen(args[0].from,
1378                                      OCFS2_STACK_LABEL_LEN) !=
1379                              OCFS2_STACK_LABEL_LEN)) {
1380                                 mlog(ML_ERROR,
1381                                      "Invalid cluster_stack option\n");
1382                                 status = 0;
1383                                 goto bail;
1384                         }
1385                         memcpy(mopt->cluster_stack, args[0].from,
1386                                OCFS2_STACK_LABEL_LEN);
1387                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1388                         break;
1389                 case Opt_inode64:
1390                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1391                         break;
1392                 case Opt_usrquota:
1393                         /* We check only on remount, otherwise features
1394                          * aren't yet initialized. */
1395                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1396                             OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1397                                 mlog(ML_ERROR, "User quota requested but "
1398                                      "filesystem feature is not set\n");
1399                                 status = 0;
1400                                 goto bail;
1401                         }
1402                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1403                         break;
1404                 case Opt_grpquota:
1405                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1406                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1407                                 mlog(ML_ERROR, "Group quota requested but "
1408                                      "filesystem feature is not set\n");
1409                                 status = 0;
1410                                 goto bail;
1411                         }
1412                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1413                         break;
1414 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1415                 case Opt_acl:
1416                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1417                         break;
1418                 case Opt_noacl:
1419                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1420                         break;
1421 #else
1422                 case Opt_acl:
1423                 case Opt_noacl:
1424                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
1425                         break;
1426 #endif
1427                 default:
1428                         mlog(ML_ERROR,
1429                              "Unrecognized mount option \"%s\" "
1430                              "or missing value\n", p);
1431                         status = 0;
1432                         goto bail;
1433                 }
1434         }
1435
1436         status = 1;
1437
1438 bail:
1439         mlog_exit(status);
1440         return status;
1441 }
1442
1443 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1444 {
1445         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1446         unsigned long opts = osb->s_mount_opt;
1447         unsigned int local_alloc_megs;
1448
1449         if (opts & OCFS2_MOUNT_HB_LOCAL)
1450                 seq_printf(s, ",_netdev,heartbeat=local");
1451         else
1452                 seq_printf(s, ",heartbeat=none");
1453
1454         if (opts & OCFS2_MOUNT_NOINTR)
1455                 seq_printf(s, ",nointr");
1456
1457         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1458                 seq_printf(s, ",data=writeback");
1459         else
1460                 seq_printf(s, ",data=ordered");
1461
1462         if (opts & OCFS2_MOUNT_BARRIER)
1463                 seq_printf(s, ",barrier=1");
1464
1465         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1466                 seq_printf(s, ",errors=panic");
1467         else
1468                 seq_printf(s, ",errors=remount-ro");
1469
1470         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1471                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1472
1473         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1474                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1475
1476         if (osb->osb_commit_interval)
1477                 seq_printf(s, ",commit=%u",
1478                            (unsigned) (osb->osb_commit_interval / HZ));
1479
1480         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1481         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1482                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1483
1484         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1485                 seq_printf(s, ",localflocks,");
1486
1487         if (osb->osb_cluster_stack[0])
1488                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1489                            osb->osb_cluster_stack);
1490         if (opts & OCFS2_MOUNT_USRQUOTA)
1491                 seq_printf(s, ",usrquota");
1492         if (opts & OCFS2_MOUNT_GRPQUOTA)
1493                 seq_printf(s, ",grpquota");
1494
1495         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1496                 seq_printf(s, ",nouser_xattr");
1497         else
1498                 seq_printf(s, ",user_xattr");
1499
1500         if (opts & OCFS2_MOUNT_INODE64)
1501                 seq_printf(s, ",inode64");
1502
1503 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1504         if (opts & OCFS2_MOUNT_POSIX_ACL)
1505                 seq_printf(s, ",acl");
1506         else
1507                 seq_printf(s, ",noacl");
1508 #endif
1509
1510         return 0;
1511 }
1512
1513 static int __init ocfs2_init(void)
1514 {
1515         int status;
1516
1517         mlog_entry_void();
1518
1519         ocfs2_print_version();
1520
1521         status = init_ocfs2_uptodate_cache();
1522         if (status < 0) {
1523                 mlog_errno(status);
1524                 goto leave;
1525         }
1526
1527         status = ocfs2_initialize_mem_caches();
1528         if (status < 0) {
1529                 mlog_errno(status);
1530                 goto leave;
1531         }
1532
1533         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1534         if (!ocfs2_wq) {
1535                 status = -ENOMEM;
1536                 goto leave;
1537         }
1538
1539         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1540         if (!ocfs2_debugfs_root) {
1541                 status = -EFAULT;
1542                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1543         }
1544
1545         status = ocfs2_quota_setup();
1546         if (status)
1547                 goto leave;
1548
1549         ocfs2_set_locking_protocol();
1550
1551         status = register_quota_format(&ocfs2_quota_format);
1552 leave:
1553         if (status < 0) {
1554                 ocfs2_quota_shutdown();
1555                 ocfs2_free_mem_caches();
1556                 exit_ocfs2_uptodate_cache();
1557         }
1558
1559         mlog_exit(status);
1560
1561         if (status >= 0) {
1562                 return register_filesystem(&ocfs2_fs_type);
1563         } else
1564                 return -1;
1565 }
1566
1567 static void __exit ocfs2_exit(void)
1568 {
1569         mlog_entry_void();
1570
1571         ocfs2_quota_shutdown();
1572
1573         if (ocfs2_wq) {
1574                 flush_workqueue(ocfs2_wq);
1575                 destroy_workqueue(ocfs2_wq);
1576         }
1577
1578         unregister_quota_format(&ocfs2_quota_format);
1579
1580         debugfs_remove(ocfs2_debugfs_root);
1581
1582         ocfs2_free_mem_caches();
1583
1584         unregister_filesystem(&ocfs2_fs_type);
1585
1586         exit_ocfs2_uptodate_cache();
1587
1588         mlog_exit_void();
1589 }
1590
1591 static void ocfs2_put_super(struct super_block *sb)
1592 {
1593         mlog_entry("(0x%p)\n", sb);
1594
1595         lock_kernel();
1596
1597         ocfs2_sync_blockdev(sb);
1598         ocfs2_dismount_volume(sb, 0);
1599
1600         unlock_kernel();
1601
1602         mlog_exit_void();
1603 }
1604
1605 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1606 {
1607         struct ocfs2_super *osb;
1608         u32 numbits, freebits;
1609         int status;
1610         struct ocfs2_dinode *bm_lock;
1611         struct buffer_head *bh = NULL;
1612         struct inode *inode = NULL;
1613
1614         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1615
1616         osb = OCFS2_SB(dentry->d_sb);
1617
1618         inode = ocfs2_get_system_file_inode(osb,
1619                                             GLOBAL_BITMAP_SYSTEM_INODE,
1620                                             OCFS2_INVALID_SLOT);
1621         if (!inode) {
1622                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1623                 status = -EIO;
1624                 goto bail;
1625         }
1626
1627         status = ocfs2_inode_lock(inode, &bh, 0);
1628         if (status < 0) {
1629                 mlog_errno(status);
1630                 goto bail;
1631         }
1632
1633         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1634
1635         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1636         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1637
1638         buf->f_type = OCFS2_SUPER_MAGIC;
1639         buf->f_bsize = dentry->d_sb->s_blocksize;
1640         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1641         buf->f_blocks = ((sector_t) numbits) *
1642                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1643         buf->f_bfree = ((sector_t) freebits) *
1644                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1645         buf->f_bavail = buf->f_bfree;
1646         buf->f_files = numbits;
1647         buf->f_ffree = freebits;
1648
1649         brelse(bh);
1650
1651         ocfs2_inode_unlock(inode, 0);
1652         status = 0;
1653 bail:
1654         if (inode)
1655                 iput(inode);
1656
1657         mlog_exit(status);
1658
1659         return status;
1660 }
1661
1662 static void ocfs2_inode_init_once(void *data)
1663 {
1664         struct ocfs2_inode_info *oi = data;
1665
1666         oi->ip_flags = 0;
1667         oi->ip_open_count = 0;
1668         spin_lock_init(&oi->ip_lock);
1669         ocfs2_extent_map_init(&oi->vfs_inode);
1670         INIT_LIST_HEAD(&oi->ip_io_markers);
1671         oi->ip_created_trans = 0;
1672         oi->ip_last_trans = 0;
1673         oi->ip_dir_start_lookup = 0;
1674
1675         init_rwsem(&oi->ip_alloc_sem);
1676         init_rwsem(&oi->ip_xattr_sem);
1677         mutex_init(&oi->ip_io_mutex);
1678
1679         oi->ip_blkno = 0ULL;
1680         oi->ip_clusters = 0;
1681
1682         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1683         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1684         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1685
1686         ocfs2_metadata_cache_init(&oi->vfs_inode);
1687
1688         inode_init_once(&oi->vfs_inode);
1689 }
1690
1691 static int ocfs2_initialize_mem_caches(void)
1692 {
1693         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1694                                        sizeof(struct ocfs2_inode_info),
1695                                        0,
1696                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1697                                                 SLAB_MEM_SPREAD),
1698                                        ocfs2_inode_init_once);
1699         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1700                                         sizeof(struct ocfs2_dquot),
1701                                         0,
1702                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1703                                                 SLAB_MEM_SPREAD),
1704                                         NULL);
1705         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1706                                         sizeof(struct ocfs2_quota_chunk),
1707                                         0,
1708                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1709                                         NULL);
1710         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1711             !ocfs2_qf_chunk_cachep) {
1712                 if (ocfs2_inode_cachep)
1713                         kmem_cache_destroy(ocfs2_inode_cachep);
1714                 if (ocfs2_dquot_cachep)
1715                         kmem_cache_destroy(ocfs2_dquot_cachep);
1716                 if (ocfs2_qf_chunk_cachep)
1717                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1718                 return -ENOMEM;
1719         }
1720
1721         return 0;
1722 }
1723
1724 static void ocfs2_free_mem_caches(void)
1725 {
1726         if (ocfs2_inode_cachep)
1727                 kmem_cache_destroy(ocfs2_inode_cachep);
1728         ocfs2_inode_cachep = NULL;
1729
1730         if (ocfs2_dquot_cachep)
1731                 kmem_cache_destroy(ocfs2_dquot_cachep);
1732         ocfs2_dquot_cachep = NULL;
1733
1734         if (ocfs2_qf_chunk_cachep)
1735                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1736         ocfs2_qf_chunk_cachep = NULL;
1737 }
1738
1739 static int ocfs2_get_sector(struct super_block *sb,
1740                             struct buffer_head **bh,
1741                             int block,
1742                             int sect_size)
1743 {
1744         if (!sb_set_blocksize(sb, sect_size)) {
1745                 mlog(ML_ERROR, "unable to set blocksize\n");
1746                 return -EIO;
1747         }
1748
1749         *bh = sb_getblk(sb, block);
1750         if (!*bh) {
1751                 mlog_errno(-EIO);
1752                 return -EIO;
1753         }
1754         lock_buffer(*bh);
1755         if (!buffer_dirty(*bh))
1756                 clear_buffer_uptodate(*bh);
1757         unlock_buffer(*bh);
1758         ll_rw_block(READ, 1, bh);
1759         wait_on_buffer(*bh);
1760         if (!buffer_uptodate(*bh)) {
1761                 mlog_errno(-EIO);
1762                 brelse(*bh);
1763                 *bh = NULL;
1764                 return -EIO;
1765         }
1766
1767         return 0;
1768 }
1769
1770 static int ocfs2_mount_volume(struct super_block *sb)
1771 {
1772         int status = 0;
1773         int unlock_super = 0;
1774         struct ocfs2_super *osb = OCFS2_SB(sb);
1775
1776         mlog_entry_void();
1777
1778         if (ocfs2_is_hard_readonly(osb))
1779                 goto leave;
1780
1781         status = ocfs2_dlm_init(osb);
1782         if (status < 0) {
1783                 mlog_errno(status);
1784                 goto leave;
1785         }
1786
1787         status = ocfs2_super_lock(osb, 1);
1788         if (status < 0) {
1789                 mlog_errno(status);
1790                 goto leave;
1791         }
1792         unlock_super = 1;
1793
1794         /* This will load up the node map and add ourselves to it. */
1795         status = ocfs2_find_slot(osb);
1796         if (status < 0) {
1797                 mlog_errno(status);
1798                 goto leave;
1799         }
1800
1801         /* load all node-local system inodes */
1802         status = ocfs2_init_local_system_inodes(osb);
1803         if (status < 0) {
1804                 mlog_errno(status);
1805                 goto leave;
1806         }
1807
1808         status = ocfs2_check_volume(osb);
1809         if (status < 0) {
1810                 mlog_errno(status);
1811                 goto leave;
1812         }
1813
1814         status = ocfs2_truncate_log_init(osb);
1815         if (status < 0)
1816                 mlog_errno(status);
1817
1818 leave:
1819         if (unlock_super)
1820                 ocfs2_super_unlock(osb, 1);
1821
1822         mlog_exit(status);
1823         return status;
1824 }
1825
1826 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1827 {
1828         int tmp, hangup_needed = 0;
1829         struct ocfs2_super *osb = NULL;
1830         char nodestr[8];
1831
1832         mlog_entry("(0x%p)\n", sb);
1833
1834         BUG_ON(!sb);
1835         osb = OCFS2_SB(sb);
1836         BUG_ON(!osb);
1837
1838         debugfs_remove(osb->osb_ctxt);
1839
1840         /*
1841          * Flush inode dropping work queue so that deletes are
1842          * performed while the filesystem is still working
1843          */
1844         ocfs2_drop_all_dl_inodes(osb);
1845
1846         /* Orphan scan should be stopped as early as possible */
1847         ocfs2_orphan_scan_stop(osb);
1848
1849         ocfs2_disable_quotas(osb);
1850
1851         ocfs2_shutdown_local_alloc(osb);
1852
1853         ocfs2_truncate_log_shutdown(osb);
1854
1855         /* This will disable recovery and flush any recovery work. */
1856         ocfs2_recovery_exit(osb);
1857
1858         ocfs2_journal_shutdown(osb);
1859
1860         ocfs2_sync_blockdev(sb);
1861
1862         /* No cluster connection means we've failed during mount, so skip
1863          * all the steps which depended on that to complete. */
1864         if (osb->cconn) {
1865                 tmp = ocfs2_super_lock(osb, 1);
1866                 if (tmp < 0) {
1867                         mlog_errno(tmp);
1868                         return;
1869                 }
1870         }
1871
1872         if (osb->slot_num != OCFS2_INVALID_SLOT)
1873                 ocfs2_put_slot(osb);
1874
1875         if (osb->cconn)
1876                 ocfs2_super_unlock(osb, 1);
1877
1878         ocfs2_release_system_inodes(osb);
1879
1880         /*
1881          * If we're dismounting due to mount error, mount.ocfs2 will clean
1882          * up heartbeat.  If we're a local mount, there is no heartbeat.
1883          * If we failed before we got a uuid_str yet, we can't stop
1884          * heartbeat.  Otherwise, do it.
1885          */
1886         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1887                 hangup_needed = 1;
1888
1889         if (osb->cconn)
1890                 ocfs2_dlm_shutdown(osb, hangup_needed);
1891
1892         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1893         debugfs_remove(osb->osb_debug_root);
1894
1895         if (hangup_needed)
1896                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1897
1898         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1899
1900         if (ocfs2_mount_local(osb))
1901                 snprintf(nodestr, sizeof(nodestr), "local");
1902         else
1903                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1904
1905         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1906                osb->dev_str, nodestr);
1907
1908         ocfs2_delete_osb(osb);
1909         kfree(osb);
1910         sb->s_dev = 0;
1911         sb->s_fs_info = NULL;
1912 }
1913
1914 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1915                                 unsigned uuid_bytes)
1916 {
1917         int i, ret;
1918         char *ptr;
1919
1920         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1921
1922         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1923         if (osb->uuid_str == NULL)
1924                 return -ENOMEM;
1925
1926         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1927                 /* print with null */
1928                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1929                 if (ret != 2) /* drop super cleans up */
1930                         return -EINVAL;
1931                 /* then only advance past the last char */
1932                 ptr += 2;
1933         }
1934
1935         return 0;
1936 }
1937
1938 static int ocfs2_initialize_super(struct super_block *sb,
1939                                   struct buffer_head *bh,
1940                                   int sector_size,
1941                                   struct ocfs2_blockcheck_stats *stats)
1942 {
1943         int status;
1944         int i, cbits, bbits;
1945         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1946         struct inode *inode = NULL;
1947         struct ocfs2_journal *journal;
1948         __le32 uuid_net_key;
1949         struct ocfs2_super *osb;
1950
1951         mlog_entry_void();
1952
1953         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1954         if (!osb) {
1955                 status = -ENOMEM;
1956                 mlog_errno(status);
1957                 goto bail;
1958         }
1959
1960         sb->s_fs_info = osb;
1961         sb->s_op = &ocfs2_sops;
1962         sb->s_export_op = &ocfs2_export_ops;
1963         sb->s_qcop = &ocfs2_quotactl_ops;
1964         sb->dq_op = &ocfs2_quota_operations;
1965         sb->s_xattr = ocfs2_xattr_handlers;
1966         sb->s_time_gran = 1;
1967         sb->s_flags |= MS_NOATIME;
1968         /* this is needed to support O_LARGEFILE */
1969         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1970         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1971         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1972
1973         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1974
1975         for (i = 0; i < 3; i++)
1976                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1977         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1978
1979         osb->sb = sb;
1980         /* Save off for ocfs2_rw_direct */
1981         osb->s_sectsize_bits = blksize_bits(sector_size);
1982         BUG_ON(!osb->s_sectsize_bits);
1983
1984         spin_lock_init(&osb->dc_task_lock);
1985         init_waitqueue_head(&osb->dc_event);
1986         osb->dc_work_sequence = 0;
1987         osb->dc_wake_sequence = 0;
1988         INIT_LIST_HEAD(&osb->blocked_lock_list);
1989         osb->blocked_lock_count = 0;
1990         spin_lock_init(&osb->osb_lock);
1991         spin_lock_init(&osb->osb_xattr_lock);
1992         ocfs2_init_inode_steal_slot(osb);
1993
1994         atomic_set(&osb->alloc_stats.moves, 0);
1995         atomic_set(&osb->alloc_stats.local_data, 0);
1996         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1997         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1998         atomic_set(&osb->alloc_stats.bg_extends, 0);
1999
2000         /* Copy the blockcheck stats from the superblock probe */
2001         osb->osb_ecc_stats = *stats;
2002
2003         ocfs2_init_node_maps(osb);
2004
2005         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2006                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2007
2008         ocfs2_orphan_scan_init(osb);
2009
2010         status = ocfs2_recovery_init(osb);
2011         if (status) {
2012                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2013                 mlog_errno(status);
2014                 goto bail;
2015         }
2016
2017         init_waitqueue_head(&osb->checkpoint_event);
2018         atomic_set(&osb->needs_checkpoint, 0);
2019
2020         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2021
2022         osb->slot_num = OCFS2_INVALID_SLOT;
2023
2024         osb->s_xattr_inline_size = le16_to_cpu(
2025                                         di->id2.i_super.s_xattr_inline_size);
2026
2027         osb->local_alloc_state = OCFS2_LA_UNUSED;
2028         osb->local_alloc_bh = NULL;
2029         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2030
2031         init_waitqueue_head(&osb->osb_mount_event);
2032
2033         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2034         if (!osb->vol_label) {
2035                 mlog(ML_ERROR, "unable to alloc vol label\n");
2036                 status = -ENOMEM;
2037                 goto bail;
2038         }
2039
2040         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2041         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2042                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2043                      osb->max_slots);
2044                 status = -EINVAL;
2045                 goto bail;
2046         }
2047         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2048
2049         osb->slot_recovery_generations =
2050                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2051                         GFP_KERNEL);
2052         if (!osb->slot_recovery_generations) {
2053                 status = -ENOMEM;
2054                 mlog_errno(status);
2055                 goto bail;
2056         }
2057
2058         init_waitqueue_head(&osb->osb_wipe_event);
2059         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2060                                         sizeof(*osb->osb_orphan_wipes),
2061                                         GFP_KERNEL);
2062         if (!osb->osb_orphan_wipes) {
2063                 status = -ENOMEM;
2064                 mlog_errno(status);
2065                 goto bail;
2066         }
2067
2068         osb->s_feature_compat =
2069                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2070         osb->s_feature_ro_compat =
2071                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2072         osb->s_feature_incompat =
2073                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2074
2075         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2076                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2077                      "optional features (%x).\n", i);
2078                 status = -EINVAL;
2079                 goto bail;
2080         }
2081         if (!(osb->sb->s_flags & MS_RDONLY) &&
2082             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2083                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2084                      "unsupported optional features (%x).\n", i);
2085                 status = -EINVAL;
2086                 goto bail;
2087         }
2088
2089         if (ocfs2_userspace_stack(osb)) {
2090                 memcpy(osb->osb_cluster_stack,
2091                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2092                        OCFS2_STACK_LABEL_LEN);
2093                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2094                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2095                         mlog(ML_ERROR,
2096                              "couldn't mount because of an invalid "
2097                              "cluster stack label (%s) \n",
2098                              osb->osb_cluster_stack);
2099                         status = -EINVAL;
2100                         goto bail;
2101                 }
2102         } else {
2103                 /* The empty string is identical with classic tools that
2104                  * don't know about s_cluster_info. */
2105                 osb->osb_cluster_stack[0] = '\0';
2106         }
2107
2108         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2109
2110         /* FIXME
2111          * This should be done in ocfs2_journal_init(), but unknown
2112          * ordering issues will cause the filesystem to crash.
2113          * If anyone wants to figure out what part of the code
2114          * refers to osb->journal before ocfs2_journal_init() is run,
2115          * be my guest.
2116          */
2117         /* initialize our journal structure */
2118
2119         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2120         if (!journal) {
2121                 mlog(ML_ERROR, "unable to alloc journal\n");
2122                 status = -ENOMEM;
2123                 goto bail;
2124         }
2125         osb->journal = journal;
2126         journal->j_osb = osb;
2127
2128         atomic_set(&journal->j_num_trans, 0);
2129         init_rwsem(&journal->j_trans_barrier);
2130         init_waitqueue_head(&journal->j_checkpointed);
2131         spin_lock_init(&journal->j_lock);
2132         journal->j_trans_id = (unsigned long) 1;
2133         INIT_LIST_HEAD(&journal->j_la_cleanups);
2134         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2135         journal->j_state = OCFS2_JOURNAL_FREE;
2136
2137         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2138         osb->dentry_lock_list = NULL;
2139
2140         /* get some pseudo constants for clustersize bits */
2141         osb->s_clustersize_bits =
2142                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2143         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2144         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2145
2146         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2147             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2148                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2149                      osb->s_clustersize);
2150                 status = -EINVAL;
2151                 goto bail;
2152         }
2153
2154         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2155             > (u32)~0UL) {
2156                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2157                      "what jbd can address in 32 bits.\n");
2158                 status = -EINVAL;
2159                 goto bail;
2160         }
2161
2162         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2163                                  sizeof(di->id2.i_super.s_uuid))) {
2164                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2165                 status = -ENOMEM;
2166                 goto bail;
2167         }
2168
2169         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2170
2171         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2172         osb->vol_label[63] = '\0';
2173         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2174         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2175         osb->first_cluster_group_blkno =
2176                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2177         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2178         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2179         mlog(0, "vol_label: %s\n", osb->vol_label);
2180         mlog(0, "uuid: %s\n", osb->uuid_str);
2181         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2182              (unsigned long long)osb->root_blkno,
2183              (unsigned long long)osb->system_dir_blkno);
2184
2185         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2186         if (!osb->osb_dlm_debug) {
2187                 status = -ENOMEM;
2188                 mlog_errno(status);
2189                 goto bail;
2190         }
2191
2192         atomic_set(&osb->vol_state, VOLUME_INIT);
2193
2194         /* load root, system_dir, and all global system inodes */
2195         status = ocfs2_init_global_system_inodes(osb);
2196         if (status < 0) {
2197                 mlog_errno(status);
2198                 goto bail;
2199         }
2200
2201         /*
2202          * global bitmap
2203          */
2204         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2205                                             OCFS2_INVALID_SLOT);
2206         if (!inode) {
2207                 status = -EINVAL;
2208                 mlog_errno(status);
2209                 goto bail;
2210         }
2211
2212         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2213         iput(inode);
2214
2215         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2216
2217         status = ocfs2_init_slot_info(osb);
2218         if (status < 0) {
2219                 mlog_errno(status);
2220                 goto bail;
2221         }
2222
2223 bail:
2224         mlog_exit(status);
2225         return status;
2226 }
2227
2228 /*
2229  * will return: -EAGAIN if it is ok to keep searching for superblocks
2230  *              -EINVAL if there is a bad superblock
2231  *              0 on success
2232  */
2233 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2234                                struct buffer_head *bh,
2235                                u32 blksz,
2236                                struct ocfs2_blockcheck_stats *stats)
2237 {
2238         int status = -EAGAIN;
2239
2240         mlog_entry_void();
2241
2242         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2243                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2244                 /* We have to do a raw check of the feature here */
2245                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2246                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2247                         status = ocfs2_block_check_validate(bh->b_data,
2248                                                             bh->b_size,
2249                                                             &di->i_check,
2250                                                             stats);
2251                         if (status)
2252                                 goto out;
2253                 }
2254                 status = -EINVAL;
2255                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2256                         mlog(ML_ERROR, "found superblock with incorrect block "
2257                              "size: found %u, should be %u\n",
2258                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2259                                blksz);
2260                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2261                            OCFS2_MAJOR_REV_LEVEL ||
2262                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2263                            OCFS2_MINOR_REV_LEVEL) {
2264                         mlog(ML_ERROR, "found superblock with bad version: "
2265                              "found %u.%u, should be %u.%u\n",
2266                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2267                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2268                              OCFS2_MAJOR_REV_LEVEL,
2269                              OCFS2_MINOR_REV_LEVEL);
2270                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2271                         mlog(ML_ERROR, "bad block number on superblock: "
2272                              "found %llu, should be %llu\n",
2273                              (unsigned long long)le64_to_cpu(di->i_blkno),
2274                              (unsigned long long)bh->b_blocknr);
2275                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2276                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2277                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2278                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2279                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2280                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2281                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2282                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2283                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2284                         mlog(ML_ERROR,
2285                              "Superblock slots found greater than file system "
2286                              "maximum: found %u, max %u\n",
2287                              le16_to_cpu(di->id2.i_super.s_max_slots),
2288                              OCFS2_MAX_SLOTS);
2289                 } else {
2290                         /* found it! */
2291                         status = 0;
2292                 }
2293         }
2294
2295 out:
2296         mlog_exit(status);
2297         return status;
2298 }
2299
2300 static int ocfs2_check_volume(struct ocfs2_super *osb)
2301 {
2302         int status;
2303         int dirty;
2304         int local;
2305         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2306                                                   * recover
2307                                                   * ourselves. */
2308
2309         mlog_entry_void();
2310
2311         /* Init our journal object. */
2312         status = ocfs2_journal_init(osb->journal, &dirty);
2313         if (status < 0) {
2314                 mlog(ML_ERROR, "Could not initialize journal!\n");
2315                 goto finally;
2316         }
2317
2318         /* If the journal was unmounted cleanly then we don't want to
2319          * recover anything. Otherwise, journal_load will do that
2320          * dirty work for us :) */
2321         if (!dirty) {
2322                 status = ocfs2_journal_wipe(osb->journal, 0);
2323                 if (status < 0) {
2324                         mlog_errno(status);
2325                         goto finally;
2326                 }
2327         } else {
2328                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2329                      "recovering volume.\n");
2330         }
2331
2332         local = ocfs2_mount_local(osb);
2333
2334         /* will play back anything left in the journal. */
2335         status = ocfs2_journal_load(osb->journal, local, dirty);
2336         if (status < 0) {
2337                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2338                 goto finally;
2339         }
2340
2341         if (dirty) {
2342                 /* recover my local alloc if we didn't unmount cleanly. */
2343                 status = ocfs2_begin_local_alloc_recovery(osb,
2344                                                           osb->slot_num,
2345                                                           &local_alloc);
2346                 if (status < 0) {
2347                         mlog_errno(status);
2348                         goto finally;
2349                 }
2350                 /* we complete the recovery process after we've marked
2351                  * ourselves as mounted. */
2352         }
2353
2354         mlog(0, "Journal loaded.\n");
2355
2356         status = ocfs2_load_local_alloc(osb);
2357         if (status < 0) {
2358                 mlog_errno(status);
2359                 goto finally;
2360         }
2361
2362         if (dirty) {
2363                 /* Recovery will be completed after we've mounted the
2364                  * rest of the volume. */
2365                 osb->dirty = 1;
2366                 osb->local_alloc_copy = local_alloc;
2367                 local_alloc = NULL;
2368         }
2369
2370         /* go through each journal, trylock it and if you get the
2371          * lock, and it's marked as dirty, set the bit in the recover
2372          * map and launch a recovery thread for it. */
2373         status = ocfs2_mark_dead_nodes(osb);
2374         if (status < 0) {
2375                 mlog_errno(status);
2376                 goto finally;
2377         }
2378
2379         status = ocfs2_compute_replay_slots(osb);
2380         if (status < 0)
2381                 mlog_errno(status);
2382
2383 finally:
2384         if (local_alloc)
2385                 kfree(local_alloc);
2386
2387         mlog_exit(status);
2388         return status;
2389 }
2390
2391 /*
2392  * The routine gets called from dismount or close whenever a dismount on
2393  * volume is requested and the osb open count becomes 1.
2394  * It will remove the osb from the global list and also free up all the
2395  * initialized resources and fileobject.
2396  */
2397 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2398 {
2399         mlog_entry_void();
2400
2401         /* This function assumes that the caller has the main osb resource */
2402
2403         ocfs2_free_slot_info(osb);
2404
2405         kfree(osb->osb_orphan_wipes);
2406         kfree(osb->slot_recovery_generations);
2407         /* FIXME
2408          * This belongs in journal shutdown, but because we have to
2409          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2410          * we free it here.
2411          */
2412         kfree(osb->journal);
2413         if (osb->local_alloc_copy)
2414                 kfree(osb->local_alloc_copy);
2415         kfree(osb->uuid_str);
2416         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2417         memset(osb, 0, sizeof(struct ocfs2_super));
2418
2419         mlog_exit_void();
2420 }
2421
2422 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2423  * panic(). We do not support continue-on-error operation. */
2424 static void ocfs2_handle_error(struct super_block *sb)
2425 {
2426         struct ocfs2_super *osb = OCFS2_SB(sb);
2427
2428         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2429                 panic("OCFS2: (device %s): panic forced after error\n",
2430                       sb->s_id);
2431
2432         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2433
2434         if (sb->s_flags & MS_RDONLY &&
2435             (ocfs2_is_soft_readonly(osb) ||
2436              ocfs2_is_hard_readonly(osb)))
2437                 return;
2438
2439         printk(KERN_CRIT "File system is now read-only due to the potential "
2440                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2441                "system is unmounted.\n");
2442         sb->s_flags |= MS_RDONLY;
2443         ocfs2_set_ro_flag(osb, 0);
2444 }
2445
2446 static char error_buf[1024];
2447
2448 void __ocfs2_error(struct super_block *sb,
2449                    const char *function,
2450                    const char *fmt, ...)
2451 {
2452         va_list args;
2453
2454         va_start(args, fmt);
2455         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2456         va_end(args);
2457
2458         /* Not using mlog here because we want to show the actual
2459          * function the error came from. */
2460         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2461                sb->s_id, function, error_buf);
2462
2463         ocfs2_handle_error(sb);
2464 }
2465
2466 /* Handle critical errors. This is intentionally more drastic than
2467  * ocfs2_handle_error, so we only use for things like journal errors,
2468  * etc. */
2469 void __ocfs2_abort(struct super_block* sb,
2470                    const char *function,
2471                    const char *fmt, ...)
2472 {
2473         va_list args;
2474
2475         va_start(args, fmt);
2476         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2477         va_end(args);
2478
2479         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2480                sb->s_id, function, error_buf);
2481
2482         /* We don't have the cluster support yet to go straight to
2483          * hard readonly in here. Until then, we want to keep
2484          * ocfs2_abort() so that we can at least mark critical
2485          * errors.
2486          *
2487          * TODO: This should abort the journal and alert other nodes
2488          * that our slot needs recovery. */
2489
2490         /* Force a panic(). This stinks, but it's better than letting
2491          * things continue without having a proper hard readonly
2492          * here. */
2493         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2494         ocfs2_handle_error(sb);
2495 }
2496
2497 module_init(ocfs2_init);
2498 module_exit(ocfs2_exit);