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         /* Prevent further queueing of inode drop events */
1222         spin_lock(&dentry_list_lock);
1223         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1224         spin_unlock(&dentry_list_lock);
1225         /* Wait for work to finish and/or remove it */
1226         cancel_work_sync(&osb->dentry_lock_work);
1227
1228         kill_block_super(sb);
1229 }
1230
1231 static struct file_system_type ocfs2_fs_type = {
1232         .owner          = THIS_MODULE,
1233         .name           = "ocfs2",
1234         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1235                                         * the fs? */
1236         .kill_sb        = ocfs2_kill_sb,
1237
1238         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1239         .next           = NULL
1240 };
1241
1242 static int ocfs2_parse_options(struct super_block *sb,
1243                                char *options,
1244                                struct mount_options *mopt,
1245                                int is_remount)
1246 {
1247         int status;
1248         char *p;
1249
1250         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1251                    options ? options : "(none)");
1252
1253         mopt->commit_interval = 0;
1254         mopt->mount_opt = 0;
1255         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1256         mopt->slot = OCFS2_INVALID_SLOT;
1257         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1258         mopt->cluster_stack[0] = '\0';
1259
1260         if (!options) {
1261                 status = 1;
1262                 goto bail;
1263         }
1264
1265         while ((p = strsep(&options, ",")) != NULL) {
1266                 int token, option;
1267                 substring_t args[MAX_OPT_ARGS];
1268
1269                 if (!*p)
1270                         continue;
1271
1272                 token = match_token(p, tokens, args);
1273                 switch (token) {
1274                 case Opt_hb_local:
1275                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1276                         break;
1277                 case Opt_hb_none:
1278                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1279                         break;
1280                 case Opt_barrier:
1281                         if (match_int(&args[0], &option)) {
1282                                 status = 0;
1283                                 goto bail;
1284                         }
1285                         if (option)
1286                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1287                         else
1288                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1289                         break;
1290                 case Opt_intr:
1291                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1292                         break;
1293                 case Opt_nointr:
1294                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1295                         break;
1296                 case Opt_err_panic:
1297                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1298                         break;
1299                 case Opt_err_ro:
1300                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1301                         break;
1302                 case Opt_data_ordered:
1303                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1304                         break;
1305                 case Opt_data_writeback:
1306                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1307                         break;
1308                 case Opt_user_xattr:
1309                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1310                         break;
1311                 case Opt_nouser_xattr:
1312                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1313                         break;
1314                 case Opt_atime_quantum:
1315                         if (match_int(&args[0], &option)) {
1316                                 status = 0;
1317                                 goto bail;
1318                         }
1319                         if (option >= 0)
1320                                 mopt->atime_quantum = option;
1321                         break;
1322                 case Opt_slot:
1323                         option = 0;
1324                         if (match_int(&args[0], &option)) {
1325                                 status = 0;
1326                                 goto bail;
1327                         }
1328                         if (option)
1329                                 mopt->slot = (s16)option;
1330                         break;
1331                 case Opt_commit:
1332                         option = 0;
1333                         if (match_int(&args[0], &option)) {
1334                                 status = 0;
1335                                 goto bail;
1336                         }
1337                         if (option < 0)
1338                                 return 0;
1339                         if (option == 0)
1340                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1341                         mopt->commit_interval = HZ * option;
1342                         break;
1343                 case Opt_localalloc:
1344                         option = 0;
1345                         if (match_int(&args[0], &option)) {
1346                                 status = 0;
1347                                 goto bail;
1348                         }
1349                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1350                                 mopt->localalloc_opt = option;
1351                         break;
1352                 case Opt_localflocks:
1353                         /*
1354                          * Changing this during remount could race
1355                          * flock() requests, or "unbalance" existing
1356                          * ones (e.g., a lock is taken in one mode but
1357                          * dropped in the other). If users care enough
1358                          * to flip locking modes during remount, we
1359                          * could add a "local" flag to individual
1360                          * flock structures for proper tracking of
1361                          * state.
1362                          */
1363                         if (!is_remount)
1364                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1365                         break;
1366                 case Opt_stack:
1367                         /* Check both that the option we were passed
1368                          * is of the right length and that it is a proper
1369                          * string of the right length.
1370                          */
1371                         if (((args[0].to - args[0].from) !=
1372                              OCFS2_STACK_LABEL_LEN) ||
1373                             (strnlen(args[0].from,
1374                                      OCFS2_STACK_LABEL_LEN) !=
1375                              OCFS2_STACK_LABEL_LEN)) {
1376                                 mlog(ML_ERROR,
1377                                      "Invalid cluster_stack option\n");
1378                                 status = 0;
1379                                 goto bail;
1380                         }
1381                         memcpy(mopt->cluster_stack, args[0].from,
1382                                OCFS2_STACK_LABEL_LEN);
1383                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1384                         break;
1385                 case Opt_inode64:
1386                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1387                         break;
1388                 case Opt_usrquota:
1389                         /* We check only on remount, otherwise features
1390                          * aren't yet initialized. */
1391                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1392                             OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1393                                 mlog(ML_ERROR, "User quota requested but "
1394                                      "filesystem feature is not set\n");
1395                                 status = 0;
1396                                 goto bail;
1397                         }
1398                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1399                         break;
1400                 case Opt_grpquota:
1401                         if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1402                             OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1403                                 mlog(ML_ERROR, "Group quota requested but "
1404                                      "filesystem feature is not set\n");
1405                                 status = 0;
1406                                 goto bail;
1407                         }
1408                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1409                         break;
1410 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1411                 case Opt_acl:
1412                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1413                         break;
1414                 case Opt_noacl:
1415                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1416                         break;
1417 #else
1418                 case Opt_acl:
1419                 case Opt_noacl:
1420                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
1421                         break;
1422 #endif
1423                 default:
1424                         mlog(ML_ERROR,
1425                              "Unrecognized mount option \"%s\" "
1426                              "or missing value\n", p);
1427                         status = 0;
1428                         goto bail;
1429                 }
1430         }
1431
1432         status = 1;
1433
1434 bail:
1435         mlog_exit(status);
1436         return status;
1437 }
1438
1439 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1440 {
1441         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1442         unsigned long opts = osb->s_mount_opt;
1443         unsigned int local_alloc_megs;
1444
1445         if (opts & OCFS2_MOUNT_HB_LOCAL)
1446                 seq_printf(s, ",_netdev,heartbeat=local");
1447         else
1448                 seq_printf(s, ",heartbeat=none");
1449
1450         if (opts & OCFS2_MOUNT_NOINTR)
1451                 seq_printf(s, ",nointr");
1452
1453         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1454                 seq_printf(s, ",data=writeback");
1455         else
1456                 seq_printf(s, ",data=ordered");
1457
1458         if (opts & OCFS2_MOUNT_BARRIER)
1459                 seq_printf(s, ",barrier=1");
1460
1461         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1462                 seq_printf(s, ",errors=panic");
1463         else
1464                 seq_printf(s, ",errors=remount-ro");
1465
1466         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1467                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1468
1469         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1470                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1471
1472         if (osb->osb_commit_interval)
1473                 seq_printf(s, ",commit=%u",
1474                            (unsigned) (osb->osb_commit_interval / HZ));
1475
1476         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1477         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1478                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1479
1480         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1481                 seq_printf(s, ",localflocks,");
1482
1483         if (osb->osb_cluster_stack[0])
1484                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1485                            osb->osb_cluster_stack);
1486         if (opts & OCFS2_MOUNT_USRQUOTA)
1487                 seq_printf(s, ",usrquota");
1488         if (opts & OCFS2_MOUNT_GRPQUOTA)
1489                 seq_printf(s, ",grpquota");
1490
1491         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1492                 seq_printf(s, ",nouser_xattr");
1493         else
1494                 seq_printf(s, ",user_xattr");
1495
1496         if (opts & OCFS2_MOUNT_INODE64)
1497                 seq_printf(s, ",inode64");
1498
1499 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1500         if (opts & OCFS2_MOUNT_POSIX_ACL)
1501                 seq_printf(s, ",acl");
1502         else
1503                 seq_printf(s, ",noacl");
1504 #endif
1505
1506         return 0;
1507 }
1508
1509 static int __init ocfs2_init(void)
1510 {
1511         int status;
1512
1513         mlog_entry_void();
1514
1515         ocfs2_print_version();
1516
1517         status = init_ocfs2_uptodate_cache();
1518         if (status < 0) {
1519                 mlog_errno(status);
1520                 goto leave;
1521         }
1522
1523         status = ocfs2_initialize_mem_caches();
1524         if (status < 0) {
1525                 mlog_errno(status);
1526                 goto leave;
1527         }
1528
1529         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1530         if (!ocfs2_wq) {
1531                 status = -ENOMEM;
1532                 goto leave;
1533         }
1534
1535         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1536         if (!ocfs2_debugfs_root) {
1537                 status = -EFAULT;
1538                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1539         }
1540
1541         status = ocfs2_quota_setup();
1542         if (status)
1543                 goto leave;
1544
1545         ocfs2_set_locking_protocol();
1546
1547         status = register_quota_format(&ocfs2_quota_format);
1548 leave:
1549         if (status < 0) {
1550                 ocfs2_quota_shutdown();
1551                 ocfs2_free_mem_caches();
1552                 exit_ocfs2_uptodate_cache();
1553         }
1554
1555         mlog_exit(status);
1556
1557         if (status >= 0) {
1558                 return register_filesystem(&ocfs2_fs_type);
1559         } else
1560                 return -1;
1561 }
1562
1563 static void __exit ocfs2_exit(void)
1564 {
1565         mlog_entry_void();
1566
1567         ocfs2_quota_shutdown();
1568
1569         if (ocfs2_wq) {
1570                 flush_workqueue(ocfs2_wq);
1571                 destroy_workqueue(ocfs2_wq);
1572         }
1573
1574         unregister_quota_format(&ocfs2_quota_format);
1575
1576         debugfs_remove(ocfs2_debugfs_root);
1577
1578         ocfs2_free_mem_caches();
1579
1580         unregister_filesystem(&ocfs2_fs_type);
1581
1582         exit_ocfs2_uptodate_cache();
1583
1584         mlog_exit_void();
1585 }
1586
1587 static void ocfs2_put_super(struct super_block *sb)
1588 {
1589         mlog_entry("(0x%p)\n", sb);
1590
1591         lock_kernel();
1592
1593         ocfs2_sync_blockdev(sb);
1594         ocfs2_dismount_volume(sb, 0);
1595
1596         unlock_kernel();
1597
1598         mlog_exit_void();
1599 }
1600
1601 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1602 {
1603         struct ocfs2_super *osb;
1604         u32 numbits, freebits;
1605         int status;
1606         struct ocfs2_dinode *bm_lock;
1607         struct buffer_head *bh = NULL;
1608         struct inode *inode = NULL;
1609
1610         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1611
1612         osb = OCFS2_SB(dentry->d_sb);
1613
1614         inode = ocfs2_get_system_file_inode(osb,
1615                                             GLOBAL_BITMAP_SYSTEM_INODE,
1616                                             OCFS2_INVALID_SLOT);
1617         if (!inode) {
1618                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1619                 status = -EIO;
1620                 goto bail;
1621         }
1622
1623         status = ocfs2_inode_lock(inode, &bh, 0);
1624         if (status < 0) {
1625                 mlog_errno(status);
1626                 goto bail;
1627         }
1628
1629         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1630
1631         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1632         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1633
1634         buf->f_type = OCFS2_SUPER_MAGIC;
1635         buf->f_bsize = dentry->d_sb->s_blocksize;
1636         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1637         buf->f_blocks = ((sector_t) numbits) *
1638                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1639         buf->f_bfree = ((sector_t) freebits) *
1640                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1641         buf->f_bavail = buf->f_bfree;
1642         buf->f_files = numbits;
1643         buf->f_ffree = freebits;
1644
1645         brelse(bh);
1646
1647         ocfs2_inode_unlock(inode, 0);
1648         status = 0;
1649 bail:
1650         if (inode)
1651                 iput(inode);
1652
1653         mlog_exit(status);
1654
1655         return status;
1656 }
1657
1658 static void ocfs2_inode_init_once(void *data)
1659 {
1660         struct ocfs2_inode_info *oi = data;
1661
1662         oi->ip_flags = 0;
1663         oi->ip_open_count = 0;
1664         spin_lock_init(&oi->ip_lock);
1665         ocfs2_extent_map_init(&oi->vfs_inode);
1666         INIT_LIST_HEAD(&oi->ip_io_markers);
1667         oi->ip_created_trans = 0;
1668         oi->ip_last_trans = 0;
1669         oi->ip_dir_start_lookup = 0;
1670
1671         init_rwsem(&oi->ip_alloc_sem);
1672         init_rwsem(&oi->ip_xattr_sem);
1673         mutex_init(&oi->ip_io_mutex);
1674
1675         oi->ip_blkno = 0ULL;
1676         oi->ip_clusters = 0;
1677
1678         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1679         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1680         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1681
1682         ocfs2_metadata_cache_init(&oi->vfs_inode);
1683
1684         inode_init_once(&oi->vfs_inode);
1685 }
1686
1687 static int ocfs2_initialize_mem_caches(void)
1688 {
1689         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1690                                        sizeof(struct ocfs2_inode_info),
1691                                        0,
1692                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1693                                                 SLAB_MEM_SPREAD),
1694                                        ocfs2_inode_init_once);
1695         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1696                                         sizeof(struct ocfs2_dquot),
1697                                         0,
1698                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1699                                                 SLAB_MEM_SPREAD),
1700                                         NULL);
1701         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1702                                         sizeof(struct ocfs2_quota_chunk),
1703                                         0,
1704                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1705                                         NULL);
1706         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1707             !ocfs2_qf_chunk_cachep) {
1708                 if (ocfs2_inode_cachep)
1709                         kmem_cache_destroy(ocfs2_inode_cachep);
1710                 if (ocfs2_dquot_cachep)
1711                         kmem_cache_destroy(ocfs2_dquot_cachep);
1712                 if (ocfs2_qf_chunk_cachep)
1713                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1714                 return -ENOMEM;
1715         }
1716
1717         return 0;
1718 }
1719
1720 static void ocfs2_free_mem_caches(void)
1721 {
1722         if (ocfs2_inode_cachep)
1723                 kmem_cache_destroy(ocfs2_inode_cachep);
1724         ocfs2_inode_cachep = NULL;
1725
1726         if (ocfs2_dquot_cachep)
1727                 kmem_cache_destroy(ocfs2_dquot_cachep);
1728         ocfs2_dquot_cachep = NULL;
1729
1730         if (ocfs2_qf_chunk_cachep)
1731                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1732         ocfs2_qf_chunk_cachep = NULL;
1733 }
1734
1735 static int ocfs2_get_sector(struct super_block *sb,
1736                             struct buffer_head **bh,
1737                             int block,
1738                             int sect_size)
1739 {
1740         if (!sb_set_blocksize(sb, sect_size)) {
1741                 mlog(ML_ERROR, "unable to set blocksize\n");
1742                 return -EIO;
1743         }
1744
1745         *bh = sb_getblk(sb, block);
1746         if (!*bh) {
1747                 mlog_errno(-EIO);
1748                 return -EIO;
1749         }
1750         lock_buffer(*bh);
1751         if (!buffer_dirty(*bh))
1752                 clear_buffer_uptodate(*bh);
1753         unlock_buffer(*bh);
1754         ll_rw_block(READ, 1, bh);
1755         wait_on_buffer(*bh);
1756         if (!buffer_uptodate(*bh)) {
1757                 mlog_errno(-EIO);
1758                 brelse(*bh);
1759                 *bh = NULL;
1760                 return -EIO;
1761         }
1762
1763         return 0;
1764 }
1765
1766 static int ocfs2_mount_volume(struct super_block *sb)
1767 {
1768         int status = 0;
1769         int unlock_super = 0;
1770         struct ocfs2_super *osb = OCFS2_SB(sb);
1771
1772         mlog_entry_void();
1773
1774         if (ocfs2_is_hard_readonly(osb))
1775                 goto leave;
1776
1777         status = ocfs2_dlm_init(osb);
1778         if (status < 0) {
1779                 mlog_errno(status);
1780                 goto leave;
1781         }
1782
1783         status = ocfs2_super_lock(osb, 1);
1784         if (status < 0) {
1785                 mlog_errno(status);
1786                 goto leave;
1787         }
1788         unlock_super = 1;
1789
1790         /* This will load up the node map and add ourselves to it. */
1791         status = ocfs2_find_slot(osb);
1792         if (status < 0) {
1793                 mlog_errno(status);
1794                 goto leave;
1795         }
1796
1797         /* load all node-local system inodes */
1798         status = ocfs2_init_local_system_inodes(osb);
1799         if (status < 0) {
1800                 mlog_errno(status);
1801                 goto leave;
1802         }
1803
1804         status = ocfs2_check_volume(osb);
1805         if (status < 0) {
1806                 mlog_errno(status);
1807                 goto leave;
1808         }
1809
1810         status = ocfs2_truncate_log_init(osb);
1811         if (status < 0)
1812                 mlog_errno(status);
1813
1814 leave:
1815         if (unlock_super)
1816                 ocfs2_super_unlock(osb, 1);
1817
1818         mlog_exit(status);
1819         return status;
1820 }
1821
1822 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1823 {
1824         int tmp, hangup_needed = 0;
1825         struct ocfs2_super *osb = NULL;
1826         char nodestr[8];
1827
1828         mlog_entry("(0x%p)\n", sb);
1829
1830         BUG_ON(!sb);
1831         osb = OCFS2_SB(sb);
1832         BUG_ON(!osb);
1833
1834         debugfs_remove(osb->osb_ctxt);
1835
1836         /*
1837          * Flush inode dropping work queue so that deletes are
1838          * performed while the filesystem is still working
1839          */
1840         ocfs2_drop_all_dl_inodes(osb);
1841
1842         /* Orphan scan should be stopped as early as possible */
1843         ocfs2_orphan_scan_stop(osb);
1844
1845         ocfs2_disable_quotas(osb);
1846
1847         ocfs2_shutdown_local_alloc(osb);
1848
1849         ocfs2_truncate_log_shutdown(osb);
1850
1851         /* This will disable recovery and flush any recovery work. */
1852         ocfs2_recovery_exit(osb);
1853
1854         ocfs2_journal_shutdown(osb);
1855
1856         ocfs2_sync_blockdev(sb);
1857
1858         /* No cluster connection means we've failed during mount, so skip
1859          * all the steps which depended on that to complete. */
1860         if (osb->cconn) {
1861                 tmp = ocfs2_super_lock(osb, 1);
1862                 if (tmp < 0) {
1863                         mlog_errno(tmp);
1864                         return;
1865                 }
1866         }
1867
1868         if (osb->slot_num != OCFS2_INVALID_SLOT)
1869                 ocfs2_put_slot(osb);
1870
1871         if (osb->cconn)
1872                 ocfs2_super_unlock(osb, 1);
1873
1874         ocfs2_release_system_inodes(osb);
1875
1876         /*
1877          * If we're dismounting due to mount error, mount.ocfs2 will clean
1878          * up heartbeat.  If we're a local mount, there is no heartbeat.
1879          * If we failed before we got a uuid_str yet, we can't stop
1880          * heartbeat.  Otherwise, do it.
1881          */
1882         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1883                 hangup_needed = 1;
1884
1885         if (osb->cconn)
1886                 ocfs2_dlm_shutdown(osb, hangup_needed);
1887
1888         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1889         debugfs_remove(osb->osb_debug_root);
1890
1891         if (hangup_needed)
1892                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1893
1894         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1895
1896         if (ocfs2_mount_local(osb))
1897                 snprintf(nodestr, sizeof(nodestr), "local");
1898         else
1899                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1900
1901         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1902                osb->dev_str, nodestr);
1903
1904         ocfs2_delete_osb(osb);
1905         kfree(osb);
1906         sb->s_dev = 0;
1907         sb->s_fs_info = NULL;
1908 }
1909
1910 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1911                                 unsigned uuid_bytes)
1912 {
1913         int i, ret;
1914         char *ptr;
1915
1916         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1917
1918         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1919         if (osb->uuid_str == NULL)
1920                 return -ENOMEM;
1921
1922         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1923                 /* print with null */
1924                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1925                 if (ret != 2) /* drop super cleans up */
1926                         return -EINVAL;
1927                 /* then only advance past the last char */
1928                 ptr += 2;
1929         }
1930
1931         return 0;
1932 }
1933
1934 static int ocfs2_initialize_super(struct super_block *sb,
1935                                   struct buffer_head *bh,
1936                                   int sector_size,
1937                                   struct ocfs2_blockcheck_stats *stats)
1938 {
1939         int status;
1940         int i, cbits, bbits;
1941         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1942         struct inode *inode = NULL;
1943         struct ocfs2_journal *journal;
1944         __le32 uuid_net_key;
1945         struct ocfs2_super *osb;
1946
1947         mlog_entry_void();
1948
1949         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1950         if (!osb) {
1951                 status = -ENOMEM;
1952                 mlog_errno(status);
1953                 goto bail;
1954         }
1955
1956         sb->s_fs_info = osb;
1957         sb->s_op = &ocfs2_sops;
1958         sb->s_export_op = &ocfs2_export_ops;
1959         sb->s_qcop = &ocfs2_quotactl_ops;
1960         sb->dq_op = &ocfs2_quota_operations;
1961         sb->s_xattr = ocfs2_xattr_handlers;
1962         sb->s_time_gran = 1;
1963         sb->s_flags |= MS_NOATIME;
1964         /* this is needed to support O_LARGEFILE */
1965         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1966         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1967         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1968
1969         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1970
1971         for (i = 0; i < 3; i++)
1972                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1973         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1974
1975         osb->sb = sb;
1976         /* Save off for ocfs2_rw_direct */
1977         osb->s_sectsize_bits = blksize_bits(sector_size);
1978         BUG_ON(!osb->s_sectsize_bits);
1979
1980         spin_lock_init(&osb->dc_task_lock);
1981         init_waitqueue_head(&osb->dc_event);
1982         osb->dc_work_sequence = 0;
1983         osb->dc_wake_sequence = 0;
1984         INIT_LIST_HEAD(&osb->blocked_lock_list);
1985         osb->blocked_lock_count = 0;
1986         spin_lock_init(&osb->osb_lock);
1987         spin_lock_init(&osb->osb_xattr_lock);
1988         ocfs2_init_inode_steal_slot(osb);
1989
1990         atomic_set(&osb->alloc_stats.moves, 0);
1991         atomic_set(&osb->alloc_stats.local_data, 0);
1992         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1993         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1994         atomic_set(&osb->alloc_stats.bg_extends, 0);
1995
1996         /* Copy the blockcheck stats from the superblock probe */
1997         osb->osb_ecc_stats = *stats;
1998
1999         ocfs2_init_node_maps(osb);
2000
2001         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2002                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2003
2004         ocfs2_orphan_scan_init(osb);
2005
2006         status = ocfs2_recovery_init(osb);
2007         if (status) {
2008                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2009                 mlog_errno(status);
2010                 goto bail;
2011         }
2012
2013         init_waitqueue_head(&osb->checkpoint_event);
2014         atomic_set(&osb->needs_checkpoint, 0);
2015
2016         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2017
2018         osb->slot_num = OCFS2_INVALID_SLOT;
2019
2020         osb->s_xattr_inline_size = le16_to_cpu(
2021                                         di->id2.i_super.s_xattr_inline_size);
2022
2023         osb->local_alloc_state = OCFS2_LA_UNUSED;
2024         osb->local_alloc_bh = NULL;
2025         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2026
2027         init_waitqueue_head(&osb->osb_mount_event);
2028
2029         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2030         if (!osb->vol_label) {
2031                 mlog(ML_ERROR, "unable to alloc vol label\n");
2032                 status = -ENOMEM;
2033                 goto bail;
2034         }
2035
2036         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2037         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2038                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2039                      osb->max_slots);
2040                 status = -EINVAL;
2041                 goto bail;
2042         }
2043         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2044
2045         osb->slot_recovery_generations =
2046                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2047                         GFP_KERNEL);
2048         if (!osb->slot_recovery_generations) {
2049                 status = -ENOMEM;
2050                 mlog_errno(status);
2051                 goto bail;
2052         }
2053
2054         init_waitqueue_head(&osb->osb_wipe_event);
2055         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2056                                         sizeof(*osb->osb_orphan_wipes),
2057                                         GFP_KERNEL);
2058         if (!osb->osb_orphan_wipes) {
2059                 status = -ENOMEM;
2060                 mlog_errno(status);
2061                 goto bail;
2062         }
2063
2064         osb->s_feature_compat =
2065                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2066         osb->s_feature_ro_compat =
2067                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2068         osb->s_feature_incompat =
2069                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2070
2071         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2072                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2073                      "optional features (%x).\n", i);
2074                 status = -EINVAL;
2075                 goto bail;
2076         }
2077         if (!(osb->sb->s_flags & MS_RDONLY) &&
2078             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2079                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2080                      "unsupported optional features (%x).\n", i);
2081                 status = -EINVAL;
2082                 goto bail;
2083         }
2084
2085         if (ocfs2_userspace_stack(osb)) {
2086                 memcpy(osb->osb_cluster_stack,
2087                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2088                        OCFS2_STACK_LABEL_LEN);
2089                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2090                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2091                         mlog(ML_ERROR,
2092                              "couldn't mount because of an invalid "
2093                              "cluster stack label (%s) \n",
2094                              osb->osb_cluster_stack);
2095                         status = -EINVAL;
2096                         goto bail;
2097                 }
2098         } else {
2099                 /* The empty string is identical with classic tools that
2100                  * don't know about s_cluster_info. */
2101                 osb->osb_cluster_stack[0] = '\0';
2102         }
2103
2104         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2105
2106         /* FIXME
2107          * This should be done in ocfs2_journal_init(), but unknown
2108          * ordering issues will cause the filesystem to crash.
2109          * If anyone wants to figure out what part of the code
2110          * refers to osb->journal before ocfs2_journal_init() is run,
2111          * be my guest.
2112          */
2113         /* initialize our journal structure */
2114
2115         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2116         if (!journal) {
2117                 mlog(ML_ERROR, "unable to alloc journal\n");
2118                 status = -ENOMEM;
2119                 goto bail;
2120         }
2121         osb->journal = journal;
2122         journal->j_osb = osb;
2123
2124         atomic_set(&journal->j_num_trans, 0);
2125         init_rwsem(&journal->j_trans_barrier);
2126         init_waitqueue_head(&journal->j_checkpointed);
2127         spin_lock_init(&journal->j_lock);
2128         journal->j_trans_id = (unsigned long) 1;
2129         INIT_LIST_HEAD(&journal->j_la_cleanups);
2130         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2131         journal->j_state = OCFS2_JOURNAL_FREE;
2132
2133         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2134         osb->dentry_lock_list = NULL;
2135
2136         /* get some pseudo constants for clustersize bits */
2137         osb->s_clustersize_bits =
2138                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2139         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2140         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2141
2142         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2143             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2144                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2145                      osb->s_clustersize);
2146                 status = -EINVAL;
2147                 goto bail;
2148         }
2149
2150         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2151             > (u32)~0UL) {
2152                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2153                      "what jbd can address in 32 bits.\n");
2154                 status = -EINVAL;
2155                 goto bail;
2156         }
2157
2158         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2159                                  sizeof(di->id2.i_super.s_uuid))) {
2160                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2161                 status = -ENOMEM;
2162                 goto bail;
2163         }
2164
2165         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2166
2167         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2168         osb->vol_label[63] = '\0';
2169         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2170         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2171         osb->first_cluster_group_blkno =
2172                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2173         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2174         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2175         mlog(0, "vol_label: %s\n", osb->vol_label);
2176         mlog(0, "uuid: %s\n", osb->uuid_str);
2177         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2178              (unsigned long long)osb->root_blkno,
2179              (unsigned long long)osb->system_dir_blkno);
2180
2181         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2182         if (!osb->osb_dlm_debug) {
2183                 status = -ENOMEM;
2184                 mlog_errno(status);
2185                 goto bail;
2186         }
2187
2188         atomic_set(&osb->vol_state, VOLUME_INIT);
2189
2190         /* load root, system_dir, and all global system inodes */
2191         status = ocfs2_init_global_system_inodes(osb);
2192         if (status < 0) {
2193                 mlog_errno(status);
2194                 goto bail;
2195         }
2196
2197         /*
2198          * global bitmap
2199          */
2200         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2201                                             OCFS2_INVALID_SLOT);
2202         if (!inode) {
2203                 status = -EINVAL;
2204                 mlog_errno(status);
2205                 goto bail;
2206         }
2207
2208         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2209         iput(inode);
2210
2211         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2212
2213         status = ocfs2_init_slot_info(osb);
2214         if (status < 0) {
2215                 mlog_errno(status);
2216                 goto bail;
2217         }
2218
2219 bail:
2220         mlog_exit(status);
2221         return status;
2222 }
2223
2224 /*
2225  * will return: -EAGAIN if it is ok to keep searching for superblocks
2226  *              -EINVAL if there is a bad superblock
2227  *              0 on success
2228  */
2229 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2230                                struct buffer_head *bh,
2231                                u32 blksz,
2232                                struct ocfs2_blockcheck_stats *stats)
2233 {
2234         int status = -EAGAIN;
2235
2236         mlog_entry_void();
2237
2238         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2239                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2240                 /* We have to do a raw check of the feature here */
2241                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2242                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2243                         status = ocfs2_block_check_validate(bh->b_data,
2244                                                             bh->b_size,
2245                                                             &di->i_check,
2246                                                             stats);
2247                         if (status)
2248                                 goto out;
2249                 }
2250                 status = -EINVAL;
2251                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2252                         mlog(ML_ERROR, "found superblock with incorrect block "
2253                              "size: found %u, should be %u\n",
2254                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2255                                blksz);
2256                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2257                            OCFS2_MAJOR_REV_LEVEL ||
2258                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2259                            OCFS2_MINOR_REV_LEVEL) {
2260                         mlog(ML_ERROR, "found superblock with bad version: "
2261                              "found %u.%u, should be %u.%u\n",
2262                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2263                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2264                              OCFS2_MAJOR_REV_LEVEL,
2265                              OCFS2_MINOR_REV_LEVEL);
2266                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2267                         mlog(ML_ERROR, "bad block number on superblock: "
2268                              "found %llu, should be %llu\n",
2269                              (unsigned long long)le64_to_cpu(di->i_blkno),
2270                              (unsigned long long)bh->b_blocknr);
2271                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2272                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2273                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2274                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2275                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2276                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2277                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2278                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2279                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2280                         mlog(ML_ERROR,
2281                              "Superblock slots found greater than file system "
2282                              "maximum: found %u, max %u\n",
2283                              le16_to_cpu(di->id2.i_super.s_max_slots),
2284                              OCFS2_MAX_SLOTS);
2285                 } else {
2286                         /* found it! */
2287                         status = 0;
2288                 }
2289         }
2290
2291 out:
2292         mlog_exit(status);
2293         return status;
2294 }
2295
2296 static int ocfs2_check_volume(struct ocfs2_super *osb)
2297 {
2298         int status;
2299         int dirty;
2300         int local;
2301         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2302                                                   * recover
2303                                                   * ourselves. */
2304
2305         mlog_entry_void();
2306
2307         /* Init our journal object. */
2308         status = ocfs2_journal_init(osb->journal, &dirty);
2309         if (status < 0) {
2310                 mlog(ML_ERROR, "Could not initialize journal!\n");
2311                 goto finally;
2312         }
2313
2314         /* If the journal was unmounted cleanly then we don't want to
2315          * recover anything. Otherwise, journal_load will do that
2316          * dirty work for us :) */
2317         if (!dirty) {
2318                 status = ocfs2_journal_wipe(osb->journal, 0);
2319                 if (status < 0) {
2320                         mlog_errno(status);
2321                         goto finally;
2322                 }
2323         } else {
2324                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2325                      "recovering volume.\n");
2326         }
2327
2328         local = ocfs2_mount_local(osb);
2329
2330         /* will play back anything left in the journal. */
2331         status = ocfs2_journal_load(osb->journal, local, dirty);
2332         if (status < 0) {
2333                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2334                 goto finally;
2335         }
2336
2337         if (dirty) {
2338                 /* recover my local alloc if we didn't unmount cleanly. */
2339                 status = ocfs2_begin_local_alloc_recovery(osb,
2340                                                           osb->slot_num,
2341                                                           &local_alloc);
2342                 if (status < 0) {
2343                         mlog_errno(status);
2344                         goto finally;
2345                 }
2346                 /* we complete the recovery process after we've marked
2347                  * ourselves as mounted. */
2348         }
2349
2350         mlog(0, "Journal loaded.\n");
2351
2352         status = ocfs2_load_local_alloc(osb);
2353         if (status < 0) {
2354                 mlog_errno(status);
2355                 goto finally;
2356         }
2357
2358         if (dirty) {
2359                 /* Recovery will be completed after we've mounted the
2360                  * rest of the volume. */
2361                 osb->dirty = 1;
2362                 osb->local_alloc_copy = local_alloc;
2363                 local_alloc = NULL;
2364         }
2365
2366         /* go through each journal, trylock it and if you get the
2367          * lock, and it's marked as dirty, set the bit in the recover
2368          * map and launch a recovery thread for it. */
2369         status = ocfs2_mark_dead_nodes(osb);
2370         if (status < 0) {
2371                 mlog_errno(status);
2372                 goto finally;
2373         }
2374
2375         status = ocfs2_compute_replay_slots(osb);
2376         if (status < 0)
2377                 mlog_errno(status);
2378
2379 finally:
2380         if (local_alloc)
2381                 kfree(local_alloc);
2382
2383         mlog_exit(status);
2384         return status;
2385 }
2386
2387 /*
2388  * The routine gets called from dismount or close whenever a dismount on
2389  * volume is requested and the osb open count becomes 1.
2390  * It will remove the osb from the global list and also free up all the
2391  * initialized resources and fileobject.
2392  */
2393 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2394 {
2395         mlog_entry_void();
2396
2397         /* This function assumes that the caller has the main osb resource */
2398
2399         ocfs2_free_slot_info(osb);
2400
2401         kfree(osb->osb_orphan_wipes);
2402         kfree(osb->slot_recovery_generations);
2403         /* FIXME
2404          * This belongs in journal shutdown, but because we have to
2405          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2406          * we free it here.
2407          */
2408         kfree(osb->journal);
2409         if (osb->local_alloc_copy)
2410                 kfree(osb->local_alloc_copy);
2411         kfree(osb->uuid_str);
2412         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2413         memset(osb, 0, sizeof(struct ocfs2_super));
2414
2415         mlog_exit_void();
2416 }
2417
2418 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2419  * panic(). We do not support continue-on-error operation. */
2420 static void ocfs2_handle_error(struct super_block *sb)
2421 {
2422         struct ocfs2_super *osb = OCFS2_SB(sb);
2423
2424         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2425                 panic("OCFS2: (device %s): panic forced after error\n",
2426                       sb->s_id);
2427
2428         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2429
2430         if (sb->s_flags & MS_RDONLY &&
2431             (ocfs2_is_soft_readonly(osb) ||
2432              ocfs2_is_hard_readonly(osb)))
2433                 return;
2434
2435         printk(KERN_CRIT "File system is now read-only due to the potential "
2436                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2437                "system is unmounted.\n");
2438         sb->s_flags |= MS_RDONLY;
2439         ocfs2_set_ro_flag(osb, 0);
2440 }
2441
2442 static char error_buf[1024];
2443
2444 void __ocfs2_error(struct super_block *sb,
2445                    const char *function,
2446                    const char *fmt, ...)
2447 {
2448         va_list args;
2449
2450         va_start(args, fmt);
2451         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2452         va_end(args);
2453
2454         /* Not using mlog here because we want to show the actual
2455          * function the error came from. */
2456         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2457                sb->s_id, function, error_buf);
2458
2459         ocfs2_handle_error(sb);
2460 }
2461
2462 /* Handle critical errors. This is intentionally more drastic than
2463  * ocfs2_handle_error, so we only use for things like journal errors,
2464  * etc. */
2465 void __ocfs2_abort(struct super_block* sb,
2466                    const char *function,
2467                    const char *fmt, ...)
2468 {
2469         va_list args;
2470
2471         va_start(args, fmt);
2472         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2473         va_end(args);
2474
2475         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2476                sb->s_id, function, error_buf);
2477
2478         /* We don't have the cluster support yet to go straight to
2479          * hard readonly in here. Until then, we want to keep
2480          * ocfs2_abort() so that we can at least mark critical
2481          * errors.
2482          *
2483          * TODO: This should abort the journal and alert other nodes
2484          * that our slot needs recovery. */
2485
2486         /* Force a panic(). This stinks, but it's better than letting
2487          * things continue without having a proper hard readonly
2488          * here. */
2489         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2490         ocfs2_handle_error(sb);
2491 }
2492
2493 module_init(ocfs2_init);
2494 module_exit(ocfs2_exit);