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
  45 #define MLOG_MASK_PREFIX ML_SUPER
  46 #include <cluster/masklog.h>
  47
  48 #include "ocfs2.h"
  49
  50 /* this should be the only file to include a version 1 header */
  51 #include "ocfs1_fs_compat.h"
  52
  53 #include "alloc.h"
  54 #include "dlmglue.h"
  55 #include "export.h"
  56 #include "extent_map.h"
  57 #include "heartbeat.h"
  58 #include "inode.h"
  59 #include "journal.h"
  60 #include "localalloc.h"
  61 #include "namei.h"
  62 #include "slot_map.h"
  63 #include "super.h"
  64 #include "sysfile.h"
  65 #include "uptodate.h"
  66 #include "ver.h"
  67 #include "xattr.h"
  68
  69 #include "buffer_head_io.h"
  70
  71 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  72
  73 /* OCFS2 needs to schedule several differnt types of work which
  74  * require cluster locking, disk I/O, recovery waits, etc. Since these
  75  * types of work tend to be heavy we avoid using the kernel events
  76  * workqueue and schedule on our own. */
  77 struct workqueue_struct *ocfs2_wq = NULL;
  78
  79 static struct dentry *ocfs2_debugfs_root = NULL;
  80
  81 MODULE_AUTHOR("Oracle");
  82 MODULE_LICENSE("GPL");
  83
  84 struct mount_options
  85 {
  86         unsigned long   commit_interval;
  87         unsigned long   mount_opt;
  88         unsigned int    atime_quantum;
  89         signed short    slot;
  90         unsigned int    localalloc_opt;
  91         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  92 };
  93
  94 static int ocfs2_parse_options(struct super_block *sb, char *options,
  95                                struct mount_options *mopt,
  96                                int is_remount);
  97 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
  98 static void ocfs2_put_super(struct super_block *sb);
  99 static int ocfs2_mount_volume(struct super_block *sb);
 100 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 101 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 102 static int ocfs2_initialize_mem_caches(void);
 103 static void ocfs2_free_mem_caches(void);
 104 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 105
 106 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 107
 108 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 109
 110 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 111 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 112 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 113 static int ocfs2_check_volume(struct ocfs2_super *osb);
 114 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 115                                struct buffer_head *bh,
 116                                u32 sectsize);
 117 static int ocfs2_initialize_super(struct super_block *sb,
 118                                   struct buffer_head *bh,
 119                                   int sector_size);
 120 static int ocfs2_get_sector(struct super_block *sb,
 121                             struct buffer_head **bh,
 122                             int block,
 123                             int sect_size);
 124 static void ocfs2_write_super(struct super_block *sb);
 125 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 126 static void ocfs2_destroy_inode(struct inode *inode);
 127
 128 static const struct super_operations ocfs2_sops = {
 129         .statfs         = ocfs2_statfs,
 130         .alloc_inode    = ocfs2_alloc_inode,
 131         .destroy_inode  = ocfs2_destroy_inode,
 132         .drop_inode     = ocfs2_drop_inode,
 133         .clear_inode    = ocfs2_clear_inode,
 134         .delete_inode   = ocfs2_delete_inode,
 135         .sync_fs        = ocfs2_sync_fs,
 136         .write_super    = ocfs2_write_super,
 137         .put_super      = ocfs2_put_super,
 138         .remount_fs     = ocfs2_remount,
 139         .show_options   = ocfs2_show_options,
 140 };
 141
 142 enum {
 143         Opt_barrier,
 144         Opt_err_panic,
 145         Opt_err_ro,
 146         Opt_intr,
 147         Opt_nointr,
 148         Opt_hb_none,
 149         Opt_hb_local,
 150         Opt_data_ordered,
 151         Opt_data_writeback,
 152         Opt_atime_quantum,
 153         Opt_slot,
 154         Opt_commit,
 155         Opt_localalloc,
 156         Opt_localflocks,
 157         Opt_stack,
 158         Opt_user_xattr,
 159         Opt_nouser_xattr,
 160         Opt_inode64,
 161         Opt_err,
 162 };
 163
 164 static const match_table_t tokens = {
 165         {Opt_barrier, "barrier=%u"},
 166         {Opt_err_panic, "errors=panic"},
 167         {Opt_err_ro, "errors=remount-ro"},
 168         {Opt_intr, "intr"},
 169         {Opt_nointr, "nointr"},
 170         {Opt_hb_none, OCFS2_HB_NONE},
 171         {Opt_hb_local, OCFS2_HB_LOCAL},
 172         {Opt_data_ordered, "data=ordered"},
 173         {Opt_data_writeback, "data=writeback"},
 174         {Opt_atime_quantum, "atime_quantum=%u"},
 175         {Opt_slot, "preferred_slot=%u"},
 176         {Opt_commit, "commit=%u"},
 177         {Opt_localalloc, "localalloc=%d"},
 178         {Opt_localflocks, "localflocks"},
 179         {Opt_stack, "cluster_stack=%s"},
 180         {Opt_user_xattr, "user_xattr"},
 181         {Opt_nouser_xattr, "nouser_xattr"},
 182         {Opt_inode64, "inode64"},
 183         {Opt_err, NULL}
 184 };
 185
 186 /*
 187  * write_super and sync_fs ripped right out of ext3.
 188  */
 189 static void ocfs2_write_super(struct super_block *sb)
 190 {
 191         if (mutex_trylock(&sb->s_lock) != 0)
 192                 BUG();
 193         sb->s_dirt = 0;
 194 }
 195
 196 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 197 {
 198         int status;
 199         tid_t target;
 200         struct ocfs2_super *osb = OCFS2_SB(sb);
 201
 202         sb->s_dirt = 0;
 203
 204         if (ocfs2_is_hard_readonly(osb))
 205                 return -EROFS;
 206
 207         if (wait) {
 208                 status = ocfs2_flush_truncate_log(osb);
 209                 if (status < 0)
 210                         mlog_errno(status);
 211         } else {
 212                 ocfs2_schedule_truncate_log_flush(osb, 0);
 213         }
 214
 215         if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
 216                 if (wait)
 217                         log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 218                                         target);
 219         }
 220         return 0;
 221 }
 222
 223 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 224 {
 225         struct inode *new = NULL;
 226         int status = 0;
 227         int i;
 228
 229         mlog_entry_void();
 230
 231         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 232         if (IS_ERR(new)) {
 233                 status = PTR_ERR(new);
 234                 mlog_errno(status);
 235                 goto bail;
 236         }
 237         osb->root_inode = new;
 238
 239         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 240         if (IS_ERR(new)) {
 241                 status = PTR_ERR(new);
 242                 mlog_errno(status);
 243                 goto bail;
 244         }
 245         osb->sys_root_inode = new;
 246
 247         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 248              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 249                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 250                 if (!new) {
 251                         ocfs2_release_system_inodes(osb);
 252                         status = -EINVAL;
 253                         mlog_errno(status);
 254                         /* FIXME: Should ERROR_RO_FS */
 255                         mlog(ML_ERROR, "Unable to load system inode %d, "
 256                              "possibly corrupt fs?", i);
 257                         goto bail;
 258                 }
 259                 // the array now has one ref, so drop this one
 260                 iput(new);
 261         }
 262
 263 bail:
 264         mlog_exit(status);
 265         return status;
 266 }
 267
 268 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 269 {
 270         struct inode *new = NULL;
 271         int status = 0;
 272         int i;
 273
 274         mlog_entry_void();
 275
 276         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 277              i < NUM_SYSTEM_INODES;
 278              i++) {
 279                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 280                 if (!new) {
 281                         ocfs2_release_system_inodes(osb);
 282                         status = -EINVAL;
 283                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 284                              status, i, osb->slot_num);
 285                         goto bail;
 286                 }
 287                 /* the array now has one ref, so drop this one */
 288                 iput(new);
 289         }
 290
 291 bail:
 292         mlog_exit(status);
 293         return status;
 294 }
 295
 296 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 297 {
 298         int i;
 299         struct inode *inode;
 300
 301         mlog_entry_void();
 302
 303         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 304                 inode = osb->system_inodes[i];
 305                 if (inode) {
 306                         iput(inode);
 307                         osb->system_inodes[i] = NULL;
 308                 }
 309         }
 310
 311         inode = osb->sys_root_inode;
 312         if (inode) {
 313                 iput(inode);
 314                 osb->sys_root_inode = NULL;
 315         }
 316
 317         inode = osb->root_inode;
 318         if (inode) {
 319                 iput(inode);
 320                 osb->root_inode = NULL;
 321         }
 322
 323         mlog_exit(0);
 324 }
 325
 326 /* We're allocating fs objects, use GFP_NOFS */
 327 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 328 {
 329         struct ocfs2_inode_info *oi;
 330
 331         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 332         if (!oi)
 333                 return NULL;
 334
 335         return &oi->vfs_inode;
 336 }
 337
 338 static void ocfs2_destroy_inode(struct inode *inode)
 339 {
 340         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 341 }
 342
 343 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 344                                                 unsigned int cbits)
 345 {
 346         unsigned int bytes = 1 << cbits;
 347         unsigned int trim = bytes;
 348         unsigned int bitshift = 32;
 349
 350         /*
 351          * i_size and all block offsets in ocfs2 are always 64 bits
 352          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 353          * 64 bit platforms, cluster size will be the limiting factor.
 354          */
 355
 356 #if BITS_PER_LONG == 32
 357 # if defined(CONFIG_LBD)
 358         BUILD_BUG_ON(sizeof(sector_t) != 8);
 359         /*
 360          * We might be limited by page cache size.
 361          */
 362         if (bytes > PAGE_CACHE_SIZE) {
 363                 bytes = PAGE_CACHE_SIZE;
 364                 trim = 1;
 365                 /*
 366                  * Shift by 31 here so that we don't get larger than
 367                  * MAX_LFS_FILESIZE
 368                  */
 369                 bitshift = 31;
 370         }
 371 # else
 372         /*
 373          * We are limited by the size of sector_t. Use block size, as
 374          * that's what we expose to the VFS.
 375          */
 376         bytes = 1 << bbits;
 377         trim = 1;
 378         bitshift = 31;
 379 # endif
 380 #endif
 381
 382         /*
 383          * Trim by a whole cluster when we can actually approach the
 384          * on-disk limits. Otherwise we can overflow i_clusters when
 385          * an extent start is at the max offset.
 386          */
 387         return (((unsigned long long)bytes) << bitshift) - trim;
 388 }
 389
 390 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 391 {
 392         int incompat_features;
 393         int ret = 0;
 394         struct mount_options parsed_options;
 395         struct ocfs2_super *osb = OCFS2_SB(sb);
 396
 397         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 398                 ret = -EINVAL;
 399                 goto out;
 400         }
 401
 402         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 403             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 404                 ret = -EINVAL;
 405                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 406                 goto out;
 407         }
 408
 409         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 410             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 411                 ret = -EINVAL;
 412                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 413                 goto out;
 414         }
 415
 416         /* Probably don't want this on remount; it might
 417          * mess with other nodes */
 418         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 419             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 420                 ret = -EINVAL;
 421                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 422                 goto out;
 423         }
 424
 425         /* We're going to/from readonly mode. */
 426         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 427                 /* Lock here so the check of HARD_RO and the potential
 428                  * setting of SOFT_RO is atomic. */
 429                 spin_lock(&osb->osb_lock);
 430                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 431                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 432                         ret = -EROFS;
 433                         goto unlock_osb;
 434                 }
 435
 436                 if (*flags & MS_RDONLY) {
 437                         mlog(0, "Going to ro mode.\n");
 438                         sb->s_flags |= MS_RDONLY;
 439                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 440                 } else {
 441                         mlog(0, "Making ro filesystem writeable.\n");
 442
 443                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 444                                 mlog(ML_ERROR, "Cannot remount RDWR "
 445                                      "filesystem due to previous errors.\n");
 446                                 ret = -EROFS;
 447                                 goto unlock_osb;
 448                         }
 449                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 450                         if (incompat_features) {
 451                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 452                                      "of unsupported optional features "
 453                                      "(%x).\n", incompat_features);
 454                                 ret = -EINVAL;
 455                                 goto unlock_osb;
 456                         }
 457                         sb->s_flags &= ~MS_RDONLY;
 458                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 459                 }
 460 unlock_osb:
 461                 spin_unlock(&osb->osb_lock);
 462         }
 463
 464         if (!ret) {
 465                 /* Only save off the new mount options in case of a successful
 466                  * remount. */
 467                 osb->s_mount_opt = parsed_options.mount_opt;
 468                 osb->s_atime_quantum = parsed_options.atime_quantum;
 469                 osb->preferred_slot = parsed_options.slot;
 470                 if (parsed_options.commit_interval)
 471                         osb->osb_commit_interval = parsed_options.commit_interval;
 472
 473                 if (!ocfs2_is_hard_readonly(osb))
 474                         ocfs2_set_journal_params(osb);
 475         }
 476 out:
 477         return ret;
 478 }
 479
 480 static int ocfs2_sb_probe(struct super_block *sb,
 481                           struct buffer_head **bh,
 482                           int *sector_size)
 483 {
 484         int status, tmpstat;
 485         struct ocfs1_vol_disk_hdr *hdr;
 486         struct ocfs2_dinode *di;
 487         int blksize;
 488
 489         *bh = NULL;
 490
 491         /* may be > 512 */
 492         *sector_size = bdev_hardsect_size(sb->s_bdev);
 493         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 494                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 495                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 496                 status = -EINVAL;
 497                 goto bail;
 498         }
 499
 500         /* Can this really happen? */
 501         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 502                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 503
 504         /* check block zero for old format */
 505         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 506         if (status < 0) {
 507                 mlog_errno(status);
 508                 goto bail;
 509         }
 510         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 511         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 512                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 513                      hdr->major_version, hdr->minor_version);
 514                 status = -EINVAL;
 515         }
 516         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 517                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 518                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 519                      hdr->signature);
 520                 status = -EINVAL;
 521         }
 522         brelse(*bh);
 523         *bh = NULL;
 524         if (status < 0) {
 525                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 526                      "upgraded before mounting with ocfs v2\n");
 527                 goto bail;
 528         }
 529
 530         /*
 531          * Now check at magic offset for 512, 1024, 2048, 4096
 532          * blocksizes.  4096 is the maximum blocksize because it is
 533          * the minimum clustersize.
 534          */
 535         status = -EINVAL;
 536         for (blksize = *sector_size;
 537              blksize <= OCFS2_MAX_BLOCKSIZE;
 538              blksize <<= 1) {
 539                 tmpstat = ocfs2_get_sector(sb, bh,
 540                                            OCFS2_SUPER_BLOCK_BLKNO,
 541                                            blksize);
 542                 if (tmpstat < 0) {
 543                         status = tmpstat;
 544                         mlog_errno(status);
 545                         goto bail;
 546                 }
 547                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 548                 status = ocfs2_verify_volume(di, *bh, blksize);
 549                 if (status >= 0)
 550                         goto bail;
 551                 brelse(*bh);
 552                 *bh = NULL;
 553                 if (status != -EAGAIN)
 554                         break;
 555         }
 556
 557 bail:
 558         return status;
 559 }
 560
 561 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 562 {
 563         if (ocfs2_mount_local(osb)) {
 564                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 565                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 566                              "mounted device.\n");
 567                         return -EINVAL;
 568                 }
 569         }
 570
 571         if (ocfs2_userspace_stack(osb)) {
 572                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 573                         mlog(ML_ERROR, "Userspace stack expected, but "
 574                              "o2cb heartbeat arguments passed to mount\n");
 575                         return -EINVAL;
 576                 }
 577         }
 578
 579         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 580                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 581                     !ocfs2_userspace_stack(osb)) {
 582                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 583                              "a read-write clustered device.\n");
 584                         return -EINVAL;
 585                 }
 586         }
 587
 588         return 0;
 589 }
 590
 591 /*
 592  * If we're using a userspace stack, mount should have passed
 593  * a name that matches the disk.  If not, mount should not
 594  * have passed a stack.
 595  */
 596 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 597                                         struct mount_options *mopt)
 598 {
 599         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 600                 mlog(ML_ERROR,
 601                      "cluster stack passed to mount, but this filesystem "
 602                      "does not support it\n");
 603                 return -EINVAL;
 604         }
 605
 606         if (ocfs2_userspace_stack(osb) &&
 607             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 608                     OCFS2_STACK_LABEL_LEN)) {
 609                 mlog(ML_ERROR,
 610                      "cluster stack passed to mount (\"%s\") does not "
 611                      "match the filesystem (\"%s\")\n",
 612                      mopt->cluster_stack,
 613                      osb->osb_cluster_stack);
 614                 return -EINVAL;
 615         }
 616
 617         return 0;
 618 }
 619
 620 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 621 {
 622         struct dentry *root;
 623         int status, sector_size;
 624         struct mount_options parsed_options;
 625         struct inode *inode = NULL;
 626         struct ocfs2_super *osb = NULL;
 627         struct buffer_head *bh = NULL;
 628         char nodestr[8];
 629
 630         mlog_entry("%p, %p, %i", sb, data, silent);
 631
 632         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 633                 status = -EINVAL;
 634                 goto read_super_error;
 635         }
 636
 637         /* probe for superblock */
 638         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 639         if (status < 0) {
 640                 mlog(ML_ERROR, "superblock probe failed!\n");
 641                 goto read_super_error;
 642         }
 643
 644         status = ocfs2_initialize_super(sb, bh, sector_size);
 645         osb = OCFS2_SB(sb);
 646         if (status < 0) {
 647                 mlog_errno(status);
 648                 goto read_super_error;
 649         }
 650         brelse(bh);
 651         bh = NULL;
 652         osb->s_mount_opt = parsed_options.mount_opt;
 653         osb->s_atime_quantum = parsed_options.atime_quantum;
 654         osb->preferred_slot = parsed_options.slot;
 655         osb->osb_commit_interval = parsed_options.commit_interval;
 656         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
 657         osb->local_alloc_bits = osb->local_alloc_default_bits;
 658
 659         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
 660         if (status)
 661                 goto read_super_error;
 662
 663         sb->s_magic = OCFS2_SUPER_MAGIC;
 664
 665         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
 666          * heartbeat=none */
 667         if (bdev_read_only(sb->s_bdev)) {
 668                 if (!(sb->s_flags & MS_RDONLY)) {
 669                         status = -EACCES;
 670                         mlog(ML_ERROR, "Readonly device detected but readonly "
 671                              "mount was not specified.\n");
 672                         goto read_super_error;
 673                 }
 674
 675                 /* You should not be able to start a local heartbeat
 676                  * on a readonly device. */
 677                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 678                         status = -EROFS;
 679                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
 680                              "device.\n");
 681                         goto read_super_error;
 682                 }
 683
 684                 status = ocfs2_check_journals_nolocks(osb);
 685                 if (status < 0) {
 686                         if (status == -EROFS)
 687                                 mlog(ML_ERROR, "Recovery required on readonly "
 688                                      "file system, but write access is "
 689                                      "unavailable.\n");
 690                         else
 691                                 mlog_errno(status);
 692                         goto read_super_error;
 693                 }
 694
 695                 ocfs2_set_ro_flag(osb, 1);
 696
 697                 printk(KERN_NOTICE "Readonly device detected. No cluster "
 698                        "services will be utilized for this mount. Recovery "
 699                        "will be skipped.\n");
 700         }
 701
 702         if (!ocfs2_is_hard_readonly(osb)) {
 703                 if (sb->s_flags & MS_RDONLY)
 704                         ocfs2_set_ro_flag(osb, 0);
 705         }
 706
 707         status = ocfs2_verify_heartbeat(osb);
 708         if (status < 0) {
 709                 mlog_errno(status);
 710                 goto read_super_error;
 711         }
 712
 713         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 714                                                  ocfs2_debugfs_root);
 715         if (!osb->osb_debug_root) {
 716                 status = -EINVAL;
 717                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
 718                 goto read_super_error;
 719         }
 720
 721         status = ocfs2_mount_volume(sb);
 722         if (osb->root_inode)
 723                 inode = igrab(osb->root_inode);
 724
 725         if (status < 0)
 726                 goto read_super_error;
 727
 728         if (!inode) {
 729                 status = -EIO;
 730                 mlog_errno(status);
 731                 goto read_super_error;
 732         }
 733
 734         root = d_alloc_root(inode);
 735         if (!root) {
 736                 status = -ENOMEM;
 737                 mlog_errno(status);
 738                 goto read_super_error;
 739         }
 740
 741         sb->s_root = root;
 742
 743         ocfs2_complete_mount_recovery(osb);
 744
 745         if (ocfs2_mount_local(osb))
 746                 snprintf(nodestr, sizeof(nodestr), "local");
 747         else
 748                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
 749
 750         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
 751                "with %s data mode.\n",
 752                osb->dev_str, nodestr, osb->slot_num,
 753                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
 754                "ordered");
 755
 756         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
 757         wake_up(&osb->osb_mount_event);
 758
 759         mlog_exit(status);
 760         return status;
 761
 762 read_super_error:
 763         if (bh != NULL)
 764                 brelse(bh);
 765
 766         if (inode)
 767                 iput(inode);
 768
 769         if (osb) {
 770                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
 771                 wake_up(&osb->osb_mount_event);
 772                 ocfs2_dismount_volume(sb, 1);
 773         }
 774
 775         mlog_exit(status);
 776         return status;
 777 }
 778
 779 static int ocfs2_get_sb(struct file_system_type *fs_type,
 780                         int flags,
 781                         const char *dev_name,
 782                         void *data,
 783                         struct vfsmount *mnt)
 784 {
 785         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
 786                            mnt);
 787 }
 788
 789 static struct file_system_type ocfs2_fs_type = {
 790         .owner          = THIS_MODULE,
 791         .name           = "ocfs2",
 792         .get_sb         = ocfs2_get_sb, /* is this called when we mount
 793                                         * the fs? */
 794         .kill_sb        = kill_block_super, /* set to the generic one
 795                                              * right now, but do we
 796                                              * need to change that? */
 797         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
 798         .next           = NULL
 799 };
 800
 801 static int ocfs2_parse_options(struct super_block *sb,
 802                                char *options,
 803                                struct mount_options *mopt,
 804                                int is_remount)
 805 {
 806         int status;
 807         char *p;
 808
 809         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
 810                    options ? options : "(none)");
 811
 812         mopt->commit_interval = 0;
 813         mopt->mount_opt = 0;
 814         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 815         mopt->slot = OCFS2_INVALID_SLOT;
 816         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
 817         mopt->cluster_stack[0] = '\0';
 818
 819         if (!options) {
 820                 status = 1;
 821                 goto bail;
 822         }
 823
 824         while ((p = strsep(&options, ",")) != NULL) {
 825                 int token, option;
 826                 substring_t args[MAX_OPT_ARGS];
 827
 828                 if (!*p)
 829                         continue;
 830
 831                 token = match_token(p, tokens, args);
 832                 switch (token) {
 833                 case Opt_hb_local:
 834                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
 835                         break;
 836                 case Opt_hb_none:
 837                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
 838                         break;
 839                 case Opt_barrier:
 840                         if (match_int(&args[0], &option)) {
 841                                 status = 0;
 842                                 goto bail;
 843                         }
 844                         if (option)
 845                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
 846                         else
 847                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
 848                         break;
 849                 case Opt_intr:
 850                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
 851                         break;
 852                 case Opt_nointr:
 853                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
 854                         break;
 855                 case Opt_err_panic:
 856                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
 857                         break;
 858                 case Opt_err_ro:
 859                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
 860                         break;
 861                 case Opt_data_ordered:
 862                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
 863                         break;
 864                 case Opt_data_writeback:
 865                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 866                         break;
 867                 case Opt_user_xattr:
 868                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
 869                         break;
 870                 case Opt_nouser_xattr:
 871                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
 872                         break;
 873                 case Opt_atime_quantum:
 874                         if (match_int(&args[0], &option)) {
 875                                 status = 0;
 876                                 goto bail;
 877                         }
 878                         if (option >= 0)
 879                                 mopt->atime_quantum = option;
 880                         break;
 881                 case Opt_slot:
 882                         option = 0;
 883                         if (match_int(&args[0], &option)) {
 884                                 status = 0;
 885                                 goto bail;
 886                         }
 887                         if (option)
 888                                 mopt->slot = (s16)option;
 889                         break;
 890                 case Opt_commit:
 891                         option = 0;
 892                         if (match_int(&args[0], &option)) {
 893                                 status = 0;
 894                                 goto bail;
 895                         }
 896                         if (option < 0)
 897                                 return 0;
 898                         if (option == 0)
 899                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 900                         mopt->commit_interval = HZ * option;
 901                         break;
 902                 case Opt_localalloc:
 903                         option = 0;
 904                         if (match_int(&args[0], &option)) {
 905                                 status = 0;
 906                                 goto bail;
 907                         }
 908                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
 909                                 mopt->localalloc_opt = option;
 910                         break;
 911                 case Opt_localflocks:
 912                         /*
 913                          * Changing this during remount could race
 914                          * flock() requests, or "unbalance" existing
 915                          * ones (e.g., a lock is taken in one mode but
 916                          * dropped in the other). If users care enough
 917                          * to flip locking modes during remount, we
 918                          * could add a "local" flag to individual
 919                          * flock structures for proper tracking of
 920                          * state.
 921                          */
 922                         if (!is_remount)
 923                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
 924                         break;
 925                 case Opt_stack:
 926                         /* Check both that the option we were passed
 927                          * is of the right length and that it is a proper
 928                          * string of the right length.
 929                          */
 930                         if (((args[0].to - args[0].from) !=
 931                              OCFS2_STACK_LABEL_LEN) ||
 932                             (strnlen(args[0].from,
 933                                      OCFS2_STACK_LABEL_LEN) !=
 934                              OCFS2_STACK_LABEL_LEN)) {
 935                                 mlog(ML_ERROR,
 936                                      "Invalid cluster_stack option\n");
 937                                 status = 0;
 938                                 goto bail;
 939                         }
 940                         memcpy(mopt->cluster_stack, args[0].from,
 941                                OCFS2_STACK_LABEL_LEN);
 942                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
 943                         break;
 944                 case Opt_inode64:
 945                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
 946                         break;
 947                 default:
 948                         mlog(ML_ERROR,
 949                              "Unrecognized mount option \"%s\" "
 950                              "or missing value\n", p);
 951                         status = 0;
 952                         goto bail;
 953                 }
 954         }
 955
 956         status = 1;
 957
 958 bail:
 959         mlog_exit(status);
 960         return status;
 961 }
 962
 963 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 964 {
 965         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
 966         unsigned long opts = osb->s_mount_opt;
 967         unsigned int local_alloc_megs;
 968
 969         if (opts & OCFS2_MOUNT_HB_LOCAL)
 970                 seq_printf(s, ",_netdev,heartbeat=local");
 971         else
 972                 seq_printf(s, ",heartbeat=none");
 973
 974         if (opts & OCFS2_MOUNT_NOINTR)
 975                 seq_printf(s, ",nointr");
 976
 977         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
 978                 seq_printf(s, ",data=writeback");
 979         else
 980                 seq_printf(s, ",data=ordered");
 981
 982         if (opts & OCFS2_MOUNT_BARRIER)
 983                 seq_printf(s, ",barrier=1");
 984
 985         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
 986                 seq_printf(s, ",errors=panic");
 987         else
 988                 seq_printf(s, ",errors=remount-ro");
 989
 990         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
 991                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
 992
 993         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
 994                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
 995
 996         if (osb->osb_commit_interval)
 997                 seq_printf(s, ",commit=%u",
 998                            (unsigned) (osb->osb_commit_interval / HZ));
 999
1000         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1001         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1002                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1003
1004         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1005                 seq_printf(s, ",localflocks,");
1006
1007         if (osb->osb_cluster_stack[0])
1008                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1009                            osb->osb_cluster_stack);
1010
1011         if (opts & OCFS2_MOUNT_INODE64)
1012                 seq_printf(s, ",inode64");
1013
1014         return 0;
1015 }
1016
1017 static int __init ocfs2_init(void)
1018 {
1019         int status;
1020
1021         mlog_entry_void();
1022
1023         ocfs2_print_version();
1024
1025         status = init_ocfs2_uptodate_cache();
1026         if (status < 0) {
1027                 mlog_errno(status);
1028                 goto leave;
1029         }
1030
1031         status = ocfs2_initialize_mem_caches();
1032         if (status < 0) {
1033                 mlog_errno(status);
1034                 goto leave;
1035         }
1036
1037         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1038         if (!ocfs2_wq) {
1039                 status = -ENOMEM;
1040                 goto leave;
1041         }
1042
1043         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1044         if (!ocfs2_debugfs_root) {
1045                 status = -EFAULT;
1046                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1047         }
1048
1049         ocfs2_set_locking_protocol();
1050
1051 leave:
1052         if (status < 0) {
1053                 ocfs2_free_mem_caches();
1054                 exit_ocfs2_uptodate_cache();
1055         }
1056
1057         mlog_exit(status);
1058
1059         if (status >= 0) {
1060                 return register_filesystem(&ocfs2_fs_type);
1061         } else
1062                 return -1;
1063 }
1064
1065 static void __exit ocfs2_exit(void)
1066 {
1067         mlog_entry_void();
1068
1069         if (ocfs2_wq) {
1070                 flush_workqueue(ocfs2_wq);
1071                 destroy_workqueue(ocfs2_wq);
1072         }
1073
1074         debugfs_remove(ocfs2_debugfs_root);
1075
1076         ocfs2_free_mem_caches();
1077
1078         unregister_filesystem(&ocfs2_fs_type);
1079
1080         exit_ocfs2_uptodate_cache();
1081
1082         mlog_exit_void();
1083 }
1084
1085 static void ocfs2_put_super(struct super_block *sb)
1086 {
1087         mlog_entry("(0x%p)\n", sb);
1088
1089         ocfs2_sync_blockdev(sb);
1090         ocfs2_dismount_volume(sb, 0);
1091
1092         mlog_exit_void();
1093 }
1094
1095 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1096 {
1097         struct ocfs2_super *osb;
1098         u32 numbits, freebits;
1099         int status;
1100         struct ocfs2_dinode *bm_lock;
1101         struct buffer_head *bh = NULL;
1102         struct inode *inode = NULL;
1103
1104         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1105
1106         osb = OCFS2_SB(dentry->d_sb);
1107
1108         inode = ocfs2_get_system_file_inode(osb,
1109                                             GLOBAL_BITMAP_SYSTEM_INODE,
1110                                             OCFS2_INVALID_SLOT);
1111         if (!inode) {
1112                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1113                 status = -EIO;
1114                 goto bail;
1115         }
1116
1117         status = ocfs2_inode_lock(inode, &bh, 0);
1118         if (status < 0) {
1119                 mlog_errno(status);
1120                 goto bail;
1121         }
1122
1123         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1124
1125         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1126         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1127
1128         buf->f_type = OCFS2_SUPER_MAGIC;
1129         buf->f_bsize = dentry->d_sb->s_blocksize;
1130         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1131         buf->f_blocks = ((sector_t) numbits) *
1132                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1133         buf->f_bfree = ((sector_t) freebits) *
1134                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1135         buf->f_bavail = buf->f_bfree;
1136         buf->f_files = numbits;
1137         buf->f_ffree = freebits;
1138
1139         brelse(bh);
1140
1141         ocfs2_inode_unlock(inode, 0);
1142         status = 0;
1143 bail:
1144         if (inode)
1145                 iput(inode);
1146
1147         mlog_exit(status);
1148
1149         return status;
1150 }
1151
1152 static void ocfs2_inode_init_once(void *data)
1153 {
1154         struct ocfs2_inode_info *oi = data;
1155
1156         oi->ip_flags = 0;
1157         oi->ip_open_count = 0;
1158         spin_lock_init(&oi->ip_lock);
1159         ocfs2_extent_map_init(&oi->vfs_inode);
1160         INIT_LIST_HEAD(&oi->ip_io_markers);
1161         oi->ip_created_trans = 0;
1162         oi->ip_last_trans = 0;
1163         oi->ip_dir_start_lookup = 0;
1164
1165         init_rwsem(&oi->ip_alloc_sem);
1166         init_rwsem(&oi->ip_xattr_sem);
1167         mutex_init(&oi->ip_io_mutex);
1168
1169         oi->ip_blkno = 0ULL;
1170         oi->ip_clusters = 0;
1171
1172         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1173         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1174         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1175
1176         ocfs2_metadata_cache_init(&oi->vfs_inode);
1177
1178         inode_init_once(&oi->vfs_inode);
1179 }
1180
1181 static int ocfs2_initialize_mem_caches(void)
1182 {
1183         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1184                                        sizeof(struct ocfs2_inode_info),
1185                                        0,
1186                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1187                                                 SLAB_MEM_SPREAD),
1188                                        ocfs2_inode_init_once);
1189         if (!ocfs2_inode_cachep)
1190                 return -ENOMEM;
1191
1192         return 0;
1193 }
1194
1195 static void ocfs2_free_mem_caches(void)
1196 {
1197         if (ocfs2_inode_cachep)
1198                 kmem_cache_destroy(ocfs2_inode_cachep);
1199
1200         ocfs2_inode_cachep = NULL;
1201 }
1202
1203 static int ocfs2_get_sector(struct super_block *sb,
1204                             struct buffer_head **bh,
1205                             int block,
1206                             int sect_size)
1207 {
1208         if (!sb_set_blocksize(sb, sect_size)) {
1209                 mlog(ML_ERROR, "unable to set blocksize\n");
1210                 return -EIO;
1211         }
1212
1213         *bh = sb_getblk(sb, block);
1214         if (!*bh) {
1215                 mlog_errno(-EIO);
1216                 return -EIO;
1217         }
1218         lock_buffer(*bh);
1219         if (!buffer_dirty(*bh))
1220                 clear_buffer_uptodate(*bh);
1221         unlock_buffer(*bh);
1222         ll_rw_block(READ, 1, bh);
1223         wait_on_buffer(*bh);
1224         return 0;
1225 }
1226
1227 static int ocfs2_mount_volume(struct super_block *sb)
1228 {
1229         int status = 0;
1230         int unlock_super = 0;
1231         struct ocfs2_super *osb = OCFS2_SB(sb);
1232
1233         mlog_entry_void();
1234
1235         if (ocfs2_is_hard_readonly(osb))
1236                 goto leave;
1237
1238         status = ocfs2_dlm_init(osb);
1239         if (status < 0) {
1240                 mlog_errno(status);
1241                 goto leave;
1242         }
1243
1244         status = ocfs2_super_lock(osb, 1);
1245         if (status < 0) {
1246                 mlog_errno(status);
1247                 goto leave;
1248         }
1249         unlock_super = 1;
1250
1251         /* This will load up the node map and add ourselves to it. */
1252         status = ocfs2_find_slot(osb);
1253         if (status < 0) {
1254                 mlog_errno(status);
1255                 goto leave;
1256         }
1257
1258         /* load all node-local system inodes */
1259         status = ocfs2_init_local_system_inodes(osb);
1260         if (status < 0) {
1261                 mlog_errno(status);
1262                 goto leave;
1263         }
1264
1265         status = ocfs2_check_volume(osb);
1266         if (status < 0) {
1267                 mlog_errno(status);
1268                 goto leave;
1269         }
1270
1271         status = ocfs2_truncate_log_init(osb);
1272         if (status < 0) {
1273                 mlog_errno(status);
1274                 goto leave;
1275         }
1276
1277         if (ocfs2_mount_local(osb))
1278                 goto leave;
1279
1280 leave:
1281         if (unlock_super)
1282                 ocfs2_super_unlock(osb, 1);
1283
1284         mlog_exit(status);
1285         return status;
1286 }
1287
1288 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1289 {
1290         int tmp, hangup_needed = 0;
1291         struct ocfs2_super *osb = NULL;
1292         char nodestr[8];
1293
1294         mlog_entry("(0x%p)\n", sb);
1295
1296         BUG_ON(!sb);
1297         osb = OCFS2_SB(sb);
1298         BUG_ON(!osb);
1299
1300         ocfs2_shutdown_local_alloc(osb);
1301
1302         ocfs2_truncate_log_shutdown(osb);
1303
1304         /* This will disable recovery and flush any recovery work. */
1305         ocfs2_recovery_exit(osb);
1306
1307         ocfs2_journal_shutdown(osb);
1308
1309         ocfs2_sync_blockdev(sb);
1310
1311         /* No cluster connection means we've failed during mount, so skip
1312          * all the steps which depended on that to complete. */
1313         if (osb->cconn) {
1314                 tmp = ocfs2_super_lock(osb, 1);
1315                 if (tmp < 0) {
1316                         mlog_errno(tmp);
1317                         return;
1318                 }
1319         }
1320
1321         if (osb->slot_num != OCFS2_INVALID_SLOT)
1322                 ocfs2_put_slot(osb);
1323
1324         if (osb->cconn)
1325                 ocfs2_super_unlock(osb, 1);
1326
1327         ocfs2_release_system_inodes(osb);
1328
1329         /*
1330          * If we're dismounting due to mount error, mount.ocfs2 will clean
1331          * up heartbeat.  If we're a local mount, there is no heartbeat.
1332          * If we failed before we got a uuid_str yet, we can't stop
1333          * heartbeat.  Otherwise, do it.
1334          */
1335         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1336                 hangup_needed = 1;
1337
1338         if (osb->cconn)
1339                 ocfs2_dlm_shutdown(osb, hangup_needed);
1340
1341         debugfs_remove(osb->osb_debug_root);
1342
1343         if (hangup_needed)
1344                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1345
1346         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1347
1348         if (ocfs2_mount_local(osb))
1349                 snprintf(nodestr, sizeof(nodestr), "local");
1350         else
1351                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1352
1353         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1354                osb->dev_str, nodestr);
1355
1356         ocfs2_delete_osb(osb);
1357         kfree(osb);
1358         sb->s_dev = 0;
1359         sb->s_fs_info = NULL;
1360 }
1361
1362 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1363                                 unsigned uuid_bytes)
1364 {
1365         int i, ret;
1366         char *ptr;
1367
1368         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1369
1370         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1371         if (osb->uuid_str == NULL)
1372                 return -ENOMEM;
1373
1374         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1375                 /* print with null */
1376                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1377                 if (ret != 2) /* drop super cleans up */
1378                         return -EINVAL;
1379                 /* then only advance past the last char */
1380                 ptr += 2;
1381         }
1382
1383         return 0;
1384 }
1385
1386 static int ocfs2_initialize_super(struct super_block *sb,
1387                                   struct buffer_head *bh,
1388                                   int sector_size)
1389 {
1390         int status;
1391         int i, cbits, bbits;
1392         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1393         struct inode *inode = NULL;
1394         struct ocfs2_journal *journal;
1395         __le32 uuid_net_key;
1396         struct ocfs2_super *osb;
1397
1398         mlog_entry_void();
1399
1400         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1401         if (!osb) {
1402                 status = -ENOMEM;
1403                 mlog_errno(status);
1404                 goto bail;
1405         }
1406
1407         sb->s_fs_info = osb;
1408         sb->s_op = &ocfs2_sops;
1409         sb->s_export_op = &ocfs2_export_ops;
1410         sb->s_xattr = ocfs2_xattr_handlers;
1411         sb->s_time_gran = 1;
1412         sb->s_flags |= MS_NOATIME;
1413         /* this is needed to support O_LARGEFILE */
1414         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1415         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1416         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1417
1418         osb->sb = sb;
1419         /* Save off for ocfs2_rw_direct */
1420         osb->s_sectsize_bits = blksize_bits(sector_size);
1421         BUG_ON(!osb->s_sectsize_bits);
1422
1423         spin_lock_init(&osb->dc_task_lock);
1424         init_waitqueue_head(&osb->dc_event);
1425         osb->dc_work_sequence = 0;
1426         osb->dc_wake_sequence = 0;
1427         INIT_LIST_HEAD(&osb->blocked_lock_list);
1428         osb->blocked_lock_count = 0;
1429         spin_lock_init(&osb->osb_lock);
1430         ocfs2_init_inode_steal_slot(osb);
1431
1432         atomic_set(&osb->alloc_stats.moves, 0);
1433         atomic_set(&osb->alloc_stats.local_data, 0);
1434         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1435         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1436         atomic_set(&osb->alloc_stats.bg_extends, 0);
1437
1438         ocfs2_init_node_maps(osb);
1439
1440         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1441                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1442
1443         status = ocfs2_recovery_init(osb);
1444         if (status) {
1445                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1446                 mlog_errno(status);
1447                 goto bail;
1448         }
1449
1450         init_waitqueue_head(&osb->checkpoint_event);
1451         atomic_set(&osb->needs_checkpoint, 0);
1452
1453         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1454
1455         osb->slot_num = OCFS2_INVALID_SLOT;
1456
1457         osb->s_xattr_inline_size = le16_to_cpu(
1458                                         di->id2.i_super.s_xattr_inline_size);
1459
1460         osb->local_alloc_state = OCFS2_LA_UNUSED;
1461         osb->local_alloc_bh = NULL;
1462         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
1463
1464         init_waitqueue_head(&osb->osb_mount_event);
1465
1466         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1467         if (!osb->vol_label) {
1468                 mlog(ML_ERROR, "unable to alloc vol label\n");
1469                 status = -ENOMEM;
1470                 goto bail;
1471         }
1472
1473         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1474         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1475                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1476                      osb->max_slots);
1477                 status = -EINVAL;
1478                 goto bail;
1479         }
1480         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1481
1482         osb->slot_recovery_generations =
1483                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
1484                         GFP_KERNEL);
1485         if (!osb->slot_recovery_generations) {
1486                 status = -ENOMEM;
1487                 mlog_errno(status);
1488                 goto bail;
1489         }
1490
1491         init_waitqueue_head(&osb->osb_wipe_event);
1492         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1493                                         sizeof(*osb->osb_orphan_wipes),
1494                                         GFP_KERNEL);
1495         if (!osb->osb_orphan_wipes) {
1496                 status = -ENOMEM;
1497                 mlog_errno(status);
1498                 goto bail;
1499         }
1500
1501         osb->s_feature_compat =
1502                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1503         osb->s_feature_ro_compat =
1504                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1505         osb->s_feature_incompat =
1506                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1507
1508         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1509                 mlog(ML_ERROR, "couldn't mount because of unsupported "
1510                      "optional features (%x).\n", i);
1511                 status = -EINVAL;
1512                 goto bail;
1513         }
1514         if (!(osb->sb->s_flags & MS_RDONLY) &&
1515             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1516                 mlog(ML_ERROR, "couldn't mount RDWR because of "
1517                      "unsupported optional features (%x).\n", i);
1518                 status = -EINVAL;
1519                 goto bail;
1520         }
1521
1522         if (ocfs2_userspace_stack(osb)) {
1523                 memcpy(osb->osb_cluster_stack,
1524                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
1525                        OCFS2_STACK_LABEL_LEN);
1526                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1527                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
1528                         mlog(ML_ERROR,
1529                              "couldn't mount because of an invalid "
1530                              "cluster stack label (%s) \n",
1531                              osb->osb_cluster_stack);
1532                         status = -EINVAL;
1533                         goto bail;
1534                 }
1535         } else {
1536                 /* The empty string is identical with classic tools that
1537                  * don't know about s_cluster_info. */
1538                 osb->osb_cluster_stack[0] = '\0';
1539         }
1540
1541         get_random_bytes(&osb->s_next_generation, sizeof(u32));
1542
1543         /* FIXME
1544          * This should be done in ocfs2_journal_init(), but unknown
1545          * ordering issues will cause the filesystem to crash.
1546          * If anyone wants to figure out what part of the code
1547          * refers to osb->journal before ocfs2_journal_init() is run,
1548          * be my guest.
1549          */
1550         /* initialize our journal structure */
1551
1552         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1553         if (!journal) {
1554                 mlog(ML_ERROR, "unable to alloc journal\n");
1555                 status = -ENOMEM;
1556                 goto bail;
1557         }
1558         osb->journal = journal;
1559         journal->j_osb = osb;
1560
1561         atomic_set(&journal->j_num_trans, 0);
1562         init_rwsem(&journal->j_trans_barrier);
1563         init_waitqueue_head(&journal->j_checkpointed);
1564         spin_lock_init(&journal->j_lock);
1565         journal->j_trans_id = (unsigned long) 1;
1566         INIT_LIST_HEAD(&journal->j_la_cleanups);
1567         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1568         journal->j_state = OCFS2_JOURNAL_FREE;
1569
1570         /* get some pseudo constants for clustersize bits */
1571         osb->s_clustersize_bits =
1572                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1573         osb->s_clustersize = 1 << osb->s_clustersize_bits;
1574         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1575
1576         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1577             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1578                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1579                      osb->s_clustersize);
1580                 status = -EINVAL;
1581                 goto bail;
1582         }
1583
1584         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1585             > (u32)~0UL) {
1586                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1587                      "what jbd can address in 32 bits.\n");
1588                 status = -EINVAL;
1589                 goto bail;
1590         }
1591
1592         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1593                                  sizeof(di->id2.i_super.s_uuid))) {
1594                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1595                 status = -ENOMEM;
1596                 goto bail;
1597         }
1598
1599         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1600
1601         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1602         osb->vol_label[63] = '\0';
1603         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1604         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1605         osb->first_cluster_group_blkno =
1606                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1607         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1608         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1609         mlog(0, "vol_label: %s\n", osb->vol_label);
1610         mlog(0, "uuid: %s\n", osb->uuid_str);
1611         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1612              (unsigned long long)osb->root_blkno,
1613              (unsigned long long)osb->system_dir_blkno);
1614
1615         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1616         if (!osb->osb_dlm_debug) {
1617                 status = -ENOMEM;
1618                 mlog_errno(status);
1619                 goto bail;
1620         }
1621
1622         atomic_set(&osb->vol_state, VOLUME_INIT);
1623
1624         /* load root, system_dir, and all global system inodes */
1625         status = ocfs2_init_global_system_inodes(osb);
1626         if (status < 0) {
1627                 mlog_errno(status);
1628                 goto bail;
1629         }
1630
1631         /*
1632          * global bitmap
1633          */
1634         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1635                                             OCFS2_INVALID_SLOT);
1636         if (!inode) {
1637                 status = -EINVAL;
1638                 mlog_errno(status);
1639                 goto bail;
1640         }
1641
1642         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1643         iput(inode);
1644
1645         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
1646
1647         status = ocfs2_init_slot_info(osb);
1648         if (status < 0) {
1649                 mlog_errno(status);
1650                 goto bail;
1651         }
1652
1653 bail:
1654         mlog_exit(status);
1655         return status;
1656 }
1657
1658 /*
1659  * will return: -EAGAIN if it is ok to keep searching for superblocks
1660  *              -EINVAL if there is a bad superblock
1661  *              0 on success
1662  */
1663 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1664                                struct buffer_head *bh,
1665                                u32 blksz)
1666 {
1667         int status = -EAGAIN;
1668
1669         mlog_entry_void();
1670
1671         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1672                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1673                 status = -EINVAL;
1674                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1675                         mlog(ML_ERROR, "found superblock with incorrect block "
1676                              "size: found %u, should be %u\n",
1677                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1678                                blksz);
1679                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1680                            OCFS2_MAJOR_REV_LEVEL ||
1681                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1682                            OCFS2_MINOR_REV_LEVEL) {
1683                         mlog(ML_ERROR, "found superblock with bad version: "
1684                              "found %u.%u, should be %u.%u\n",
1685                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
1686                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1687                              OCFS2_MAJOR_REV_LEVEL,
1688                              OCFS2_MINOR_REV_LEVEL);
1689                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1690                         mlog(ML_ERROR, "bad block number on superblock: "
1691                              "found %llu, should be %llu\n",
1692                              (unsigned long long)le64_to_cpu(di->i_blkno),
1693                              (unsigned long long)bh->b_blocknr);
1694                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1695                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1696                         mlog(ML_ERROR, "bad cluster size found: %u\n",
1697                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1698                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1699                         mlog(ML_ERROR, "bad root_blkno: 0\n");
1700                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1701                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1702                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1703                         mlog(ML_ERROR,
1704                              "Superblock slots found greater than file system "
1705                              "maximum: found %u, max %u\n",
1706                              le16_to_cpu(di->id2.i_super.s_max_slots),
1707                              OCFS2_MAX_SLOTS);
1708                 } else {
1709                         /* found it! */
1710                         status = 0;
1711                 }
1712         }
1713
1714         mlog_exit(status);
1715         return status;
1716 }
1717
1718 static int ocfs2_check_volume(struct ocfs2_super *osb)
1719 {
1720         int status;
1721         int dirty;
1722         int local;
1723         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1724                                                   * recover
1725                                                   * ourselves. */
1726
1727         mlog_entry_void();
1728
1729         /* Init our journal object. */
1730         status = ocfs2_journal_init(osb->journal, &dirty);
1731         if (status < 0) {
1732                 mlog(ML_ERROR, "Could not initialize journal!\n");
1733                 goto finally;
1734         }
1735
1736         /* If the journal was unmounted cleanly then we don't want to
1737          * recover anything. Otherwise, journal_load will do that
1738          * dirty work for us :) */
1739         if (!dirty) {
1740                 status = ocfs2_journal_wipe(osb->journal, 0);
1741                 if (status < 0) {
1742                         mlog_errno(status);
1743                         goto finally;
1744                 }
1745         } else {
1746                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1747                      "recovering volume.\n");
1748         }
1749
1750         local = ocfs2_mount_local(osb);
1751
1752         /* will play back anything left in the journal. */
1753         status = ocfs2_journal_load(osb->journal, local, dirty);
1754         if (status < 0) {
1755                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
1756                 goto finally;
1757         }
1758
1759         if (dirty) {
1760                 /* recover my local alloc if we didn't unmount cleanly. */
1761                 status = ocfs2_begin_local_alloc_recovery(osb,
1762                                                           osb->slot_num,
1763                                                           &local_alloc);
1764                 if (status < 0) {
1765                         mlog_errno(status);
1766                         goto finally;
1767                 }
1768                 /* we complete the recovery process after we've marked
1769                  * ourselves as mounted. */
1770         }
1771
1772         mlog(0, "Journal loaded.\n");
1773
1774         status = ocfs2_load_local_alloc(osb);
1775         if (status < 0) {
1776                 mlog_errno(status);
1777                 goto finally;
1778         }
1779
1780         if (dirty) {
1781                 /* Recovery will be completed after we've mounted the
1782                  * rest of the volume. */
1783                 osb->dirty = 1;
1784                 osb->local_alloc_copy = local_alloc;
1785                 local_alloc = NULL;
1786         }
1787
1788         /* go through each journal, trylock it and if you get the
1789          * lock, and it's marked as dirty, set the bit in the recover
1790          * map and launch a recovery thread for it. */
1791         status = ocfs2_mark_dead_nodes(osb);
1792         if (status < 0)
1793                 mlog_errno(status);
1794
1795 finally:
1796         if (local_alloc)
1797                 kfree(local_alloc);
1798
1799         mlog_exit(status);
1800         return status;
1801 }
1802
1803 /*
1804  * The routine gets called from dismount or close whenever a dismount on
1805  * volume is requested and the osb open count becomes 1.
1806  * It will remove the osb from the global list and also free up all the
1807  * initialized resources and fileobject.
1808  */
1809 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1810 {
1811         mlog_entry_void();
1812
1813         /* This function assumes that the caller has the main osb resource */
1814
1815         ocfs2_free_slot_info(osb);
1816
1817         kfree(osb->osb_orphan_wipes);
1818         kfree(osb->slot_recovery_generations);
1819         /* FIXME
1820          * This belongs in journal shutdown, but because we have to
1821          * allocate osb->journal at the start of ocfs2_initalize_osb(),
1822          * we free it here.
1823          */
1824         kfree(osb->journal);
1825         if (osb->local_alloc_copy)
1826                 kfree(osb->local_alloc_copy);
1827         kfree(osb->uuid_str);
1828         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1829         memset(osb, 0, sizeof(struct ocfs2_super));
1830
1831         mlog_exit_void();
1832 }
1833
1834 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1835  * panic(). We do not support continue-on-error operation. */
1836 static void ocfs2_handle_error(struct super_block *sb)
1837 {
1838         struct ocfs2_super *osb = OCFS2_SB(sb);
1839
1840         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1841                 panic("OCFS2: (device %s): panic forced after error\n",
1842                       sb->s_id);
1843
1844         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1845
1846         if (sb->s_flags & MS_RDONLY &&
1847             (ocfs2_is_soft_readonly(osb) ||
1848              ocfs2_is_hard_readonly(osb)))
1849                 return;
1850
1851         printk(KERN_CRIT "File system is now read-only due to the potential "
1852                "of on-disk corruption. Please run fsck.ocfs2 once the file "
1853                "system is unmounted.\n");
1854         sb->s_flags |= MS_RDONLY;
1855         ocfs2_set_ro_flag(osb, 0);
1856 }
1857
1858 static char error_buf[1024];
1859
1860 void __ocfs2_error(struct super_block *sb,
1861                    const char *function,
1862                    const char *fmt, ...)
1863 {
1864         va_list args;
1865
1866         va_start(args, fmt);
1867         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1868         va_end(args);
1869
1870         /* Not using mlog here because we want to show the actual
1871          * function the error came from. */
1872         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1873                sb->s_id, function, error_buf);
1874
1875         ocfs2_handle_error(sb);
1876 }
1877
1878 /* Handle critical errors. This is intentionally more drastic than
1879  * ocfs2_handle_error, so we only use for things like journal errors,
1880  * etc. */
1881 void __ocfs2_abort(struct super_block* sb,
1882                    const char *function,
1883                    const char *fmt, ...)
1884 {
1885         va_list args;
1886
1887         va_start(args, fmt);
1888         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1889         va_end(args);
1890
1891         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1892                sb->s_id, function, error_buf);
1893
1894         /* We don't have the cluster support yet to go straight to
1895          * hard readonly in here. Until then, we want to keep
1896          * ocfs2_abort() so that we can at least mark critical
1897          * errors.
1898          *
1899          * TODO: This should abort the journal and alert other nodes
1900          * that our slot needs recovery. */
1901
1902         /* Force a panic(). This stinks, but it's better than letting
1903          * things continue without having a proper hard readonly
1904          * here. */
1905         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1906         ocfs2_handle_error(sb);
1907 }
1908
1909 module_init(ocfs2_init);
1910 module_exit(ocfs2_exit);