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super.c

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * super.c
 *
 * load/unload driver, mount/dismount volumes
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/statfs.h>
#include <linux/moduleparam.h>
#include <linux/blkdev.h>
#include <linux/socket.h>
#include <linux/inet.h>
#include <linux/parser.h>
#include <linux/crc32.h>
#include <linux/debugfs.h>
#include <linux/mount.h>

#include <cluster/nodemanager.h>

#define MLOG_MASK_PREFIX ML_SUPER
#include <cluster/masklog.h>

#include "ocfs2.h"

/* this should be the only file to include a version 1 header */
#include "ocfs1_fs_compat.h"

#include "alloc.h"
#include "dlmglue.h"
#include "export.h"
#include "extent_map.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "localalloc.h"
#include "namei.h"
#include "slot_map.h"
#include "super.h"
#include "sysfile.h"
#include "uptodate.h"
#include "ver.h"
#include "vote.h"

#include "buffer_head_io.h"

static struct kmem_cache *ocfs2_inode_cachep = NULL;

/* OCFS2 needs to schedule several differnt types of work which
 * require cluster locking, disk I/O, recovery waits, etc. Since these
 * types of work tend to be heavy we avoid using the kernel events
 * workqueue and schedule on our own. */
struct workqueue_struct *ocfs2_wq = NULL;

static struct dentry *ocfs2_debugfs_root = NULL;

MODULE_AUTHOR("Oracle");
MODULE_LICENSE("GPL");

struct mount_options
{
      unsigned long     mount_opt;
      unsigned int      atime_quantum;
      signed short      slot;
};

static int ocfs2_parse_options(struct super_block *sb, char *options,
                         struct mount_options *mopt,
                         int is_remount);
static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
static void ocfs2_put_super(struct super_block *sb);
static int ocfs2_mount_volume(struct super_block *sb);
static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
static int ocfs2_initialize_mem_caches(void);
static void ocfs2_free_mem_caches(void);
static void ocfs2_delete_osb(struct ocfs2_super *osb);

static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);

static int ocfs2_sync_fs(struct super_block *sb, int wait);

static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
static int ocfs2_check_volume(struct ocfs2_super *osb);
static int ocfs2_verify_volume(struct ocfs2_dinode *di,
                         struct buffer_head *bh,
                         u32 sectsize);
static int ocfs2_initialize_super(struct super_block *sb,
                          struct buffer_head *bh,
                          int sector_size);
static int ocfs2_get_sector(struct super_block *sb,
                      struct buffer_head **bh,
                      int block,
                      int sect_size);
static void ocfs2_write_super(struct super_block *sb);
static struct inode *ocfs2_alloc_inode(struct super_block *sb);
static void ocfs2_destroy_inode(struct inode *inode);

static const struct super_operations ocfs2_sops = {
      .statfs           = ocfs2_statfs,
      .alloc_inode      = ocfs2_alloc_inode,
      .destroy_inode    = ocfs2_destroy_inode,
      .drop_inode = ocfs2_drop_inode,
      .clear_inode      = ocfs2_clear_inode,
      .delete_inode     = ocfs2_delete_inode,
      .sync_fs    = ocfs2_sync_fs,
      .write_super      = ocfs2_write_super,
      .put_super  = ocfs2_put_super,
      .remount_fs = ocfs2_remount,
      .show_options   = ocfs2_show_options,
};

enum {
      Opt_barrier,
      Opt_err_panic,
      Opt_err_ro,
      Opt_intr,
      Opt_nointr,
      Opt_hb_none,
      Opt_hb_local,
      Opt_data_ordered,
      Opt_data_writeback,
      Opt_atime_quantum,
      Opt_slot,
      Opt_err,
};

static match_table_t tokens = {
      {Opt_barrier, "barrier=%u"},
      {Opt_err_panic, "errors=panic"},
      {Opt_err_ro, "errors=remount-ro"},
      {Opt_intr, "intr"},
      {Opt_nointr, "nointr"},
      {Opt_hb_none, OCFS2_HB_NONE},
      {Opt_hb_local, OCFS2_HB_LOCAL},
      {Opt_data_ordered, "data=ordered"},
      {Opt_data_writeback, "data=writeback"},
      {Opt_atime_quantum, "atime_quantum=%u"},
      {Opt_slot, "preferred_slot=%u"},
      {Opt_err, NULL}
};

/*
 * write_super and sync_fs ripped right out of ext3.
 */
static void ocfs2_write_super(struct super_block *sb)
{
      if (mutex_trylock(&sb->s_lock) != 0)
            BUG();
      sb->s_dirt = 0;
}

static int ocfs2_sync_fs(struct super_block *sb, int wait)
{
      int status;
      tid_t target;
      struct ocfs2_super *osb = OCFS2_SB(sb);

      sb->s_dirt = 0;

      if (ocfs2_is_hard_readonly(osb))
            return -EROFS;

      if (wait) {
            status = ocfs2_flush_truncate_log(osb);
            if (status < 0)
                  mlog_errno(status);
      } else {
            ocfs2_schedule_truncate_log_flush(osb, 0);
      }

      if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
            if (wait)
                  log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
                              target);
      }
      return 0;
}

static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
{
      struct inode *new = NULL;
      int status = 0;
      int i;

      mlog_entry_void();

      new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
      if (IS_ERR(new)) {
            status = PTR_ERR(new);
            mlog_errno(status);
            goto bail;
      }
      osb->root_inode = new;

      new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
      if (IS_ERR(new)) {
            status = PTR_ERR(new);
            mlog_errno(status);
            goto bail;
      }
      osb->sys_root_inode = new;

      for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
           i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
            new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
            if (!new) {
                  ocfs2_release_system_inodes(osb);
                  status = -EINVAL;
                  mlog_errno(status);
                  /* FIXME: Should ERROR_RO_FS */
                  mlog(ML_ERROR, "Unable to load system inode %d, "
                       "possibly corrupt fs?", i);
                  goto bail;
            }
            // the array now has one ref, so drop this one
            iput(new);
      }

bail:
      mlog_exit(status);
      return status;
}

static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
{
      struct inode *new = NULL;
      int status = 0;
      int i;

      mlog_entry_void();

      for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
           i < NUM_SYSTEM_INODES;
           i++) {
            new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
            if (!new) {
                  ocfs2_release_system_inodes(osb);
                  status = -EINVAL;
                  mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
                       status, i, osb->slot_num);
                  goto bail;
            }
            /* the array now has one ref, so drop this one */
            iput(new);
      }

bail:
      mlog_exit(status);
      return status;
}

static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
{
      int i;
      struct inode *inode;

      mlog_entry_void();

      for (i = 0; i < NUM_SYSTEM_INODES; i++) {
            inode = osb->system_inodes[i];
            if (inode) {
                  iput(inode);
                  osb->system_inodes[i] = NULL;
            }
      }

      inode = osb->sys_root_inode;
      if (inode) {
            iput(inode);
            osb->sys_root_inode = NULL;
      }

      inode = osb->root_inode;
      if (inode) {
            iput(inode);
            osb->root_inode = NULL;
      }

      mlog_exit(0);
}

/* We're allocating fs objects, use GFP_NOFS */
static struct inode *ocfs2_alloc_inode(struct super_block *sb)
{
      struct ocfs2_inode_info *oi;

      oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
      if (!oi)
            return NULL;

      return &oi->vfs_inode;
}

static void ocfs2_destroy_inode(struct inode *inode)
{
      kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
}

static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
                                    unsigned int cbits)
{
      unsigned int bytes = 1 << cbits;
      unsigned int trim = bytes;
      unsigned int bitshift = 32;

      /*
       * i_size and all block offsets in ocfs2 are always 64 bits
       * wide. i_clusters is 32 bits, in cluster-sized units. So on
       * 64 bit platforms, cluster size will be the limiting factor.
       */

#if BITS_PER_LONG == 32
# if defined(CONFIG_LBD)
      BUILD_BUG_ON(sizeof(sector_t) != 8);
      /*
       * We might be limited by page cache size.
       */
      if (bytes > PAGE_CACHE_SIZE) {
            bytes = PAGE_CACHE_SIZE;
            trim = 1;
            /*
             * Shift by 31 here so that we don't get larger than
             * MAX_LFS_FILESIZE
             */
            bitshift = 31;
      }
# else
      /*
       * We are limited by the size of sector_t. Use block size, as
       * that's what we expose to the VFS.
       */
      bytes = 1 << bbits;
      trim = 1;
      bitshift = 31;
# endif
#endif

      /*
       * Trim by a whole cluster when we can actually approach the
       * on-disk limits. Otherwise we can overflow i_clusters when
       * an extent start is at the max offset.
       */
      return (((unsigned long long)bytes) << bitshift) - trim;
}

static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
{
      int incompat_features;
      int ret = 0;
      struct mount_options parsed_options;
      struct ocfs2_super *osb = OCFS2_SB(sb);

      if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
            ret = -EINVAL;
            goto out;
      }

      if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
          (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
            ret = -EINVAL;
            mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
            goto out;
      }

      if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
          (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
            ret = -EINVAL;
            mlog(ML_ERROR, "Cannot change data mode on remount\n");
            goto out;
      }

      /* We're going to/from readonly mode. */
      if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
            /* Lock here so the check of HARD_RO and the potential
             * setting of SOFT_RO is atomic. */
            spin_lock(&osb->osb_lock);
            if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
                  mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
                  ret = -EROFS;
                  goto unlock_osb;
            }

            if (*flags & MS_RDONLY) {
                  mlog(0, "Going to ro mode.\n");
                  sb->s_flags |= MS_RDONLY;
                  osb->osb_flags |= OCFS2_OSB_SOFT_RO;
            } else {
                  mlog(0, "Making ro filesystem writeable.\n");

                  if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
                        mlog(ML_ERROR, "Cannot remount RDWR "
                             "filesystem due to previous errors.\n");
                        ret = -EROFS;
                        goto unlock_osb;
                  }
                  incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
                  if (incompat_features) {
                        mlog(ML_ERROR, "Cannot remount RDWR because "
                             "of unsupported optional features "
                             "(%x).\n", incompat_features);
                        ret = -EINVAL;
                        goto unlock_osb;
                  }
                  sb->s_flags &= ~MS_RDONLY;
                  osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
            }
unlock_osb:
            spin_unlock(&osb->osb_lock);
      }

      if (!ret) {
            /* Only save off the new mount options in case of a successful
             * remount. */
            osb->s_mount_opt = parsed_options.mount_opt;
            osb->s_atime_quantum = parsed_options.atime_quantum;
            osb->preferred_slot = parsed_options.slot;

            if (!ocfs2_is_hard_readonly(osb))
                  ocfs2_set_journal_params(osb);
      }
out:
      return ret;
}

static int ocfs2_sb_probe(struct super_block *sb,
                    struct buffer_head **bh,
                    int *sector_size)
{
      int status, tmpstat;
      struct ocfs1_vol_disk_hdr *hdr;
      struct ocfs2_dinode *di;
      int blksize;

      *bh = NULL;

      /* may be > 512 */
      *sector_size = bdev_hardsect_size(sb->s_bdev);
      if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
            mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
                 *sector_size, OCFS2_MAX_BLOCKSIZE);
            status = -EINVAL;
            goto bail;
      }

      /* Can this really happen? */
      if (*sector_size < OCFS2_MIN_BLOCKSIZE)
            *sector_size = OCFS2_MIN_BLOCKSIZE;

      /* check block zero for old format */
      status = ocfs2_get_sector(sb, bh, 0, *sector_size);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }
      hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
      if (hdr->major_version == OCFS1_MAJOR_VERSION) {
            mlog(ML_ERROR, "incompatible version: %u.%u\n",
                 hdr->major_version, hdr->minor_version);
            status = -EINVAL;
      }
      if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
               strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
            mlog(ML_ERROR, "incompatible volume signature: %8s\n",
                 hdr->signature);
            status = -EINVAL;
      }
      brelse(*bh);
      *bh = NULL;
      if (status < 0) {
            mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
                 "upgraded before mounting with ocfs v2\n");
            goto bail;
      }

      /*
       * Now check at magic offset for 512, 1024, 2048, 4096
       * blocksizes.  4096 is the maximum blocksize because it is
       * the minimum clustersize.
       */
      status = -EINVAL;
      for (blksize = *sector_size;
           blksize <= OCFS2_MAX_BLOCKSIZE;
           blksize <<= 1) {
            tmpstat = ocfs2_get_sector(sb, bh,
                                 OCFS2_SUPER_BLOCK_BLKNO,
                                 blksize);
            if (tmpstat < 0) {
                  status = tmpstat;
                  mlog_errno(status);
                  goto bail;
            }
            di = (struct ocfs2_dinode *) (*bh)->b_data;
            status = ocfs2_verify_volume(di, *bh, blksize);
            if (status >= 0)
                  goto bail;
            brelse(*bh);
            *bh = NULL;
            if (status != -EAGAIN)
                  break;
      }

bail:
      return status;
}

static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
{
      if (ocfs2_mount_local(osb)) {
            if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
                  mlog(ML_ERROR, "Cannot heartbeat on a locally "
                       "mounted device.\n");
                  return -EINVAL;
            }
      }

      if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
            if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
                  mlog(ML_ERROR, "Heartbeat has to be started to mount "
                       "a read-write clustered device.\n");
                  return -EINVAL;
            }
      }

      return 0;
}

static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
{
      struct dentry *root;
      int status, sector_size;
      struct mount_options parsed_options;
      struct inode *inode = NULL;
      struct ocfs2_super *osb = NULL;
      struct buffer_head *bh = NULL;
      char nodestr[8];

      mlog_entry("%p, %p, %i", sb, data, silent);

      if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
            status = -EINVAL;
            goto read_super_error;
      }

      /* for now we only have one cluster/node, make sure we see it
       * in the heartbeat universe */
      if (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL) {
            if (!o2hb_check_local_node_heartbeating()) {
                  status = -EINVAL;
                  goto read_super_error;
            }
      }

      /* probe for superblock */
      status = ocfs2_sb_probe(sb, &bh, &sector_size);
      if (status < 0) {
            mlog(ML_ERROR, "superblock probe failed!\n");
            goto read_super_error;
      }

      status = ocfs2_initialize_super(sb, bh, sector_size);
      osb = OCFS2_SB(sb);
      if (status < 0) {
            mlog_errno(status);
            goto read_super_error;
      }
      brelse(bh);
      bh = NULL;
      osb->s_mount_opt = parsed_options.mount_opt;
      osb->s_atime_quantum = parsed_options.atime_quantum;
      osb->preferred_slot = parsed_options.slot;

      sb->s_magic = OCFS2_SUPER_MAGIC;

      /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
       * heartbeat=none */
      if (bdev_read_only(sb->s_bdev)) {
            if (!(sb->s_flags & MS_RDONLY)) {
                  status = -EACCES;
                  mlog(ML_ERROR, "Readonly device detected but readonly "
                       "mount was not specified.\n");
                  goto read_super_error;
            }

            /* You should not be able to start a local heartbeat
             * on a readonly device. */
            if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
                  status = -EROFS;
                  mlog(ML_ERROR, "Local heartbeat specified on readonly "
                       "device.\n");
                  goto read_super_error;
            }

            status = ocfs2_check_journals_nolocks(osb);
            if (status < 0) {
                  if (status == -EROFS)
                        mlog(ML_ERROR, "Recovery required on readonly "
                             "file system, but write access is "
                             "unavailable.\n");
                  else
                        mlog_errno(status);                 
                  goto read_super_error;
            }

            ocfs2_set_ro_flag(osb, 1);

            printk(KERN_NOTICE "Readonly device detected. No cluster "
                   "services will be utilized for this mount. Recovery "
                   "will be skipped.\n");
      }

      if (!ocfs2_is_hard_readonly(osb)) {
            if (sb->s_flags & MS_RDONLY)
                  ocfs2_set_ro_flag(osb, 0);
      }

      status = ocfs2_verify_heartbeat(osb);
      if (status < 0) {
            mlog_errno(status);
            goto read_super_error;
      }

      osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
                                     ocfs2_debugfs_root);
      if (!osb->osb_debug_root) {
            status = -EINVAL;
            mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
            goto read_super_error;
      }

      status = ocfs2_mount_volume(sb);
      if (osb->root_inode)
            inode = igrab(osb->root_inode);

      if (status < 0)
            goto read_super_error;

      if (!inode) {
            status = -EIO;
            mlog_errno(status);
            goto read_super_error;
      }

      root = d_alloc_root(inode);
      if (!root) {
            status = -ENOMEM;
            mlog_errno(status);
            goto read_super_error;
      }

      sb->s_root = root;

      ocfs2_complete_mount_recovery(osb);

      if (ocfs2_mount_local(osb))
            snprintf(nodestr, sizeof(nodestr), "local");
      else
            snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);

      printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
             "with %s data mode.\n",
             osb->dev_str, nodestr, osb->slot_num,
             osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
             "ordered");

      atomic_set(&osb->vol_state, VOLUME_MOUNTED);
      wake_up(&osb->osb_mount_event);

      mlog_exit(status);
      return status;

read_super_error:
      if (bh != NULL)
            brelse(bh);

      if (inode)
            iput(inode);

      if (osb) {
            atomic_set(&osb->vol_state, VOLUME_DISABLED);
            wake_up(&osb->osb_mount_event);
            ocfs2_dismount_volume(sb, 1);
      }

      mlog_exit(status);
      return status;
}

static int ocfs2_get_sb(struct file_system_type *fs_type,
                  int flags,
                  const char *dev_name,
                  void *data,
                  struct vfsmount *mnt)
{
      return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
                     mnt);
}

static struct file_system_type ocfs2_fs_type = {
      .owner          = THIS_MODULE,
      .name           = "ocfs2",
      .get_sb         = ocfs2_get_sb, /* is this called when we mount
                              * the fs? */
      .kill_sb        = kill_block_super, /* set to the generic one
                                   * right now, but do we
                                   * need to change that? */
      .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
      .next           = NULL
};

static int ocfs2_parse_options(struct super_block *sb,
                         char *options,
                         struct mount_options *mopt,
                         int is_remount)
{
      int status;
      char *p;

      mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
               options ? options : "(none)");

      mopt->mount_opt = 0;
      mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
      mopt->slot = OCFS2_INVALID_SLOT;

      if (!options) {
            status = 1;
            goto bail;
      }

      while ((p = strsep(&options, ",")) != NULL) {
            int token, option;
            substring_t args[MAX_OPT_ARGS];

            if (!*p)
                  continue;

            token = match_token(p, tokens, args);
            switch (token) {
            case Opt_hb_local:
                  mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
                  break;
            case Opt_hb_none:
                  mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
                  break;
            case Opt_barrier:
                  if (match_int(&args[0], &option)) {
                        status = 0;
                        goto bail;
                  }
                  if (option)
                        mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
                  else
                        mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
                  break;
            case Opt_intr:
                  mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
                  break;
            case Opt_nointr:
                  mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
                  break;
            case Opt_err_panic:
                  mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
                  break;
            case Opt_err_ro:
                  mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
                  break;
            case Opt_data_ordered:
                  mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
                  break;
            case Opt_data_writeback:
                  mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
                  break;
            case Opt_atime_quantum:
                  if (match_int(&args[0], &option)) {
                        status = 0;
                        goto bail;
                  }
                  if (option >= 0)
                        mopt->atime_quantum = option;
                  break;
            case Opt_slot:
                  option = 0;
                  if (match_int(&args[0], &option)) {
                        status = 0;
                        goto bail;
                  }
                  if (option)
                        mopt->slot = (s16)option;
                  break;
            default:
                  mlog(ML_ERROR,
                       "Unrecognized mount option \"%s\" "
                       "or missing value\n", p);
                  status = 0;
                  goto bail;
            }
      }

      status = 1;

bail:
      mlog_exit(status);
      return status;
}

static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
{
      struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
      unsigned long opts = osb->s_mount_opt;

      if (opts & OCFS2_MOUNT_HB_LOCAL)
            seq_printf(s, ",_netdev,heartbeat=local");
      else
            seq_printf(s, ",heartbeat=none");

      if (opts & OCFS2_MOUNT_NOINTR)
            seq_printf(s, ",nointr");

      if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
            seq_printf(s, ",data=writeback");
      else
            seq_printf(s, ",data=ordered");

      if (opts & OCFS2_MOUNT_BARRIER)
            seq_printf(s, ",barrier=1");

      if (opts & OCFS2_MOUNT_ERRORS_PANIC)
            seq_printf(s, ",errors=panic");
      else
            seq_printf(s, ",errors=remount-ro");

      if (osb->preferred_slot != OCFS2_INVALID_SLOT)
            seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);

      if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
            seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);

      return 0;
}

static int __init ocfs2_init(void)
{
      int status;

      mlog_entry_void();

      ocfs2_print_version();

      status = init_ocfs2_uptodate_cache();
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_initialize_mem_caches();
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
      if (!ocfs2_wq) {
            status = -ENOMEM;
            goto leave;
      }

      ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
      if (!ocfs2_debugfs_root) {
            status = -EFAULT;
            mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
      }

leave:
      if (status < 0) {
            ocfs2_free_mem_caches();
            exit_ocfs2_uptodate_cache();
      }

      mlog_exit(status);

      if (status >= 0) {
            return register_filesystem(&ocfs2_fs_type);
      } else
            return -1;
}

static void __exit ocfs2_exit(void)
{
      mlog_entry_void();

      if (ocfs2_wq) {
            flush_workqueue(ocfs2_wq);
            destroy_workqueue(ocfs2_wq);
      }

      debugfs_remove(ocfs2_debugfs_root);

      ocfs2_free_mem_caches();

      unregister_filesystem(&ocfs2_fs_type);

      exit_ocfs2_uptodate_cache();

      mlog_exit_void();
}

static void ocfs2_put_super(struct super_block *sb)
{
      mlog_entry("(0x%p)\n", sb);

      ocfs2_sync_blockdev(sb);
      ocfs2_dismount_volume(sb, 0);

      mlog_exit_void();
}

static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
      struct ocfs2_super *osb;
      u32 numbits, freebits;
      int status;
      struct ocfs2_dinode *bm_lock;
      struct buffer_head *bh = NULL;
      struct inode *inode = NULL;

      mlog_entry("(%p, %p)\n", dentry->d_sb, buf);

      osb = OCFS2_SB(dentry->d_sb);

      inode = ocfs2_get_system_file_inode(osb,
                                  GLOBAL_BITMAP_SYSTEM_INODE,
                                  OCFS2_INVALID_SLOT);
      if (!inode) {
            mlog(ML_ERROR, "failed to get bitmap inode\n");
            status = -EIO;
            goto bail;
      }

      status = ocfs2_meta_lock(inode, &bh, 0);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      bm_lock = (struct ocfs2_dinode *) bh->b_data;

      numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
      freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);

      buf->f_type = OCFS2_SUPER_MAGIC;
      buf->f_bsize = dentry->d_sb->s_blocksize;
      buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
      buf->f_blocks = ((sector_t) numbits) *
                  (osb->s_clustersize >> osb->sb->s_blocksize_bits);
      buf->f_bfree = ((sector_t) freebits) *
                   (osb->s_clustersize >> osb->sb->s_blocksize_bits);
      buf->f_bavail = buf->f_bfree;
      buf->f_files = numbits;
      buf->f_ffree = freebits;

      brelse(bh);

      ocfs2_meta_unlock(inode, 0);
      status = 0;
bail:
      if (inode)
            iput(inode);

      mlog_exit(status);

      return status;
}

static void ocfs2_inode_init_once(struct kmem_cache *cachep, void *data)
{
      struct ocfs2_inode_info *oi = data;

      oi->ip_flags = 0;
      oi->ip_open_count = 0;
      spin_lock_init(&oi->ip_lock);
      ocfs2_extent_map_init(&oi->vfs_inode);
      INIT_LIST_HEAD(&oi->ip_io_markers);
      oi->ip_created_trans = 0;
      oi->ip_last_trans = 0;
      oi->ip_dir_start_lookup = 0;

      init_rwsem(&oi->ip_alloc_sem);
      mutex_init(&oi->ip_io_mutex);

      oi->ip_blkno = 0ULL;
      oi->ip_clusters = 0;

      ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
      ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
      ocfs2_lock_res_init_once(&oi->ip_data_lockres);
      ocfs2_lock_res_init_once(&oi->ip_open_lockres);

      ocfs2_metadata_cache_init(&oi->vfs_inode);

      inode_init_once(&oi->vfs_inode);
}

static int ocfs2_initialize_mem_caches(void)
{
      ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
                               sizeof(struct ocfs2_inode_info),
                               0,
                               (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
                                    SLAB_MEM_SPREAD),
                               ocfs2_inode_init_once);
      if (!ocfs2_inode_cachep)
            return -ENOMEM;

      return 0;
}

static void ocfs2_free_mem_caches(void)
{
      if (ocfs2_inode_cachep)
            kmem_cache_destroy(ocfs2_inode_cachep);

      ocfs2_inode_cachep = NULL;
}

static int ocfs2_get_sector(struct super_block *sb,
                      struct buffer_head **bh,
                      int block,
                      int sect_size)
{
      if (!sb_set_blocksize(sb, sect_size)) {
            mlog(ML_ERROR, "unable to set blocksize\n");
            return -EIO;
      }

      *bh = sb_getblk(sb, block);
      if (!*bh) {
            mlog_errno(-EIO);
            return -EIO;
      }
      lock_buffer(*bh);
      if (!buffer_dirty(*bh))
            clear_buffer_uptodate(*bh);
      unlock_buffer(*bh);
      ll_rw_block(READ, 1, bh);
      wait_on_buffer(*bh);
      return 0;
}

/* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
{
      int status;

      /* XXX hold a ref on the node while mounte?  easy enough, if
       * desirable. */
      if (ocfs2_mount_local(osb))
            osb->node_num = 0;
      else
            osb->node_num = o2nm_this_node();

      if (osb->node_num == O2NM_MAX_NODES) {
            mlog(ML_ERROR, "could not find this host's node number\n");
            status = -ENOENT;
            goto bail;
      }

      mlog(0, "I am node %d\n", osb->node_num);

      status = 0;
bail:
      return status;
}

static int ocfs2_mount_volume(struct super_block *sb)
{
      int status = 0;
      int unlock_super = 0;
      struct ocfs2_super *osb = OCFS2_SB(sb);

      mlog_entry_void();

      if (ocfs2_is_hard_readonly(osb))
            goto leave;

      status = ocfs2_fill_local_node_info(osb);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_register_hb_callbacks(osb);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_dlm_init(osb);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      /* requires vote_thread to be running. */
      status = ocfs2_register_net_handlers(osb);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_super_lock(osb, 1);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }
      unlock_super = 1;

      /* This will load up the node map and add ourselves to it. */
      status = ocfs2_find_slot(osb);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      ocfs2_populate_mounted_map(osb);

      /* load all node-local system inodes */
      status = ocfs2_init_local_system_inodes(osb);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_check_volume(osb);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_truncate_log_init(osb);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      if (ocfs2_mount_local(osb))
            goto leave;

      /* This should be sent *after* we recovered our journal as it
       * will cause other nodes to unmark us as needing
       * recovery. However, we need to send it *before* dropping the
       * super block lock as otherwise their recovery threads might
       * try to clean us up while we're live! */
      status = ocfs2_request_mount_vote(osb);
      if (status < 0)
            mlog_errno(status);

leave:
      if (unlock_super)
            ocfs2_super_unlock(osb, 1);

      mlog_exit(status);
      return status;
}

/* we can't grab the goofy sem lock from inside wait_event, so we use
 * memory barriers to make sure that we'll see the null task before
 * being woken up */
static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
{
      mb();
      return osb->recovery_thread_task != NULL;
}

static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
{
      int tmp;
      struct ocfs2_super *osb = NULL;
      char nodestr[8];

      mlog_entry("(0x%p)\n", sb);

      BUG_ON(!sb);
      osb = OCFS2_SB(sb);
      BUG_ON(!osb);

      ocfs2_shutdown_local_alloc(osb);

      ocfs2_truncate_log_shutdown(osb);

      /* disable any new recovery threads and wait for any currently
       * running ones to exit. Do this before setting the vol_state. */
      mutex_lock(&osb->recovery_lock);
      osb->disable_recovery = 1;
      mutex_unlock(&osb->recovery_lock);
      wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));

      /* At this point, we know that no more recovery threads can be
       * launched, so wait for any recovery completion work to
       * complete. */
      flush_workqueue(ocfs2_wq);

      ocfs2_journal_shutdown(osb);

      ocfs2_sync_blockdev(sb);

      /* No dlm means we've failed during mount, so skip all the
       * steps which depended on that to complete. */
      if (osb->dlm) {
            tmp = ocfs2_super_lock(osb, 1);
            if (tmp < 0) {
                  mlog_errno(tmp);
                  return;
            }

            tmp = ocfs2_request_umount_vote(osb);
            if (tmp < 0)
                  mlog_errno(tmp);
      }

      if (osb->slot_num != OCFS2_INVALID_SLOT)
            ocfs2_put_slot(osb);

      if (osb->dlm)
            ocfs2_super_unlock(osb, 1);

      ocfs2_release_system_inodes(osb);

      if (osb->dlm) {
            ocfs2_unregister_net_handlers(osb);

            ocfs2_dlm_shutdown(osb);
      }

      ocfs2_clear_hb_callbacks(osb);

      debugfs_remove(osb->osb_debug_root);

      if (!mnt_err)
            ocfs2_stop_heartbeat(osb);

      atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);

      if (ocfs2_mount_local(osb))
            snprintf(nodestr, sizeof(nodestr), "local");
      else
            snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);

      printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
             osb->dev_str, nodestr);

      ocfs2_delete_osb(osb);
      kfree(osb);
      sb->s_dev = 0;
      sb->s_fs_info = NULL;
}

static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
                        unsigned uuid_bytes)
{
      int i, ret;
      char *ptr;

      BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);

      osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
      if (osb->uuid_str == NULL)
            return -ENOMEM;

      for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
            /* print with null */
            ret = snprintf(ptr, 3, "%02X", uuid[i]);
            if (ret != 2) /* drop super cleans up */
                  return -EINVAL;
            /* then only advance past the last char */
            ptr += 2;
      }

      return 0;
}

static int ocfs2_initialize_super(struct super_block *sb,
                          struct buffer_head *bh,
                          int sector_size)
{
      int status;
      int i, cbits, bbits;
      struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
      struct inode *inode = NULL;
      struct buffer_head *bitmap_bh = NULL;
      struct ocfs2_journal *journal;
      __le32 uuid_net_key;
      struct ocfs2_super *osb;

      mlog_entry_void();

      osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
      if (!osb) {
            status = -ENOMEM;
            mlog_errno(status);
            goto bail;
      }

      sb->s_fs_info = osb;
      sb->s_op = &ocfs2_sops;
      sb->s_export_op = &ocfs2_export_ops;
      sb->s_time_gran = 1;
      sb->s_flags |= MS_NOATIME;
      /* this is needed to support O_LARGEFILE */
      cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
      bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
      sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);

      osb->sb = sb;
      /* Save off for ocfs2_rw_direct */
      osb->s_sectsize_bits = blksize_bits(sector_size);
      BUG_ON(!osb->s_sectsize_bits);

      osb->net_response_ids = 0;
      spin_lock_init(&osb->net_response_lock);
      INIT_LIST_HEAD(&osb->net_response_list);

      INIT_LIST_HEAD(&osb->osb_net_handlers);
      init_waitqueue_head(&osb->recovery_event);
      spin_lock_init(&osb->vote_task_lock);
      init_waitqueue_head(&osb->vote_event);
      osb->vote_work_sequence = 0;
      osb->vote_wake_sequence = 0;
      INIT_LIST_HEAD(&osb->blocked_lock_list);
      osb->blocked_lock_count = 0;
      INIT_LIST_HEAD(&osb->vote_list);
      spin_lock_init(&osb->osb_lock);

      atomic_set(&osb->alloc_stats.moves, 0);
      atomic_set(&osb->alloc_stats.local_data, 0);
      atomic_set(&osb->alloc_stats.bitmap_data, 0);
      atomic_set(&osb->alloc_stats.bg_allocs, 0);
      atomic_set(&osb->alloc_stats.bg_extends, 0);

      ocfs2_init_node_maps(osb);

      snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
             MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));

      mutex_init(&osb->recovery_lock);

      osb->disable_recovery = 0;
      osb->recovery_thread_task = NULL;

      init_waitqueue_head(&osb->checkpoint_event);
      atomic_set(&osb->needs_checkpoint, 0);

      osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;

      osb->node_num = O2NM_INVALID_NODE_NUM;
      osb->slot_num = OCFS2_INVALID_SLOT;

      osb->local_alloc_state = OCFS2_LA_UNUSED;
      osb->local_alloc_bh = NULL;

      ocfs2_setup_hb_callbacks(osb);

      init_waitqueue_head(&osb->osb_mount_event);

      osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
      if (!osb->vol_label) {
            mlog(ML_ERROR, "unable to alloc vol label\n");
            status = -ENOMEM;
            goto bail;
      }

      osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
      if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
            mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
                 osb->max_slots);
            status = -EINVAL;
            goto bail;
      }
      mlog(0, "max_slots for this device: %u\n", osb->max_slots);

      init_waitqueue_head(&osb->osb_wipe_event);
      osb->osb_orphan_wipes = kcalloc(osb->max_slots,
                              sizeof(*osb->osb_orphan_wipes),
                              GFP_KERNEL);
      if (!osb->osb_orphan_wipes) {
            status = -ENOMEM;
            mlog_errno(status);
            goto bail;
      }

      osb->s_feature_compat =
            le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
      osb->s_feature_ro_compat =
            le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
      osb->s_feature_incompat =
            le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);

      if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
            mlog(ML_ERROR, "couldn't mount because of unsupported "
                 "optional features (%x).\n", i);
            status = -EINVAL;
            goto bail;
      }
      if (!(osb->sb->s_flags & MS_RDONLY) &&
          (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
            mlog(ML_ERROR, "couldn't mount RDWR because of "
                 "unsupported optional features (%x).\n", i);
            status = -EINVAL;
            goto bail;
      }

      get_random_bytes(&osb->s_next_generation, sizeof(u32));

      /* FIXME
       * This should be done in ocfs2_journal_init(), but unknown
       * ordering issues will cause the filesystem to crash.
       * If anyone wants to figure out what part of the code
       * refers to osb->journal before ocfs2_journal_init() is run,
       * be my guest.
       */
      /* initialize our journal structure */

      journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
      if (!journal) {
            mlog(ML_ERROR, "unable to alloc journal\n");
            status = -ENOMEM;
            goto bail;
      }
      osb->journal = journal;
      journal->j_osb = osb;

      atomic_set(&journal->j_num_trans, 0);
      init_rwsem(&journal->j_trans_barrier);
      init_waitqueue_head(&journal->j_checkpointed);
      spin_lock_init(&journal->j_lock);
      journal->j_trans_id = (unsigned long) 1;
      INIT_LIST_HEAD(&journal->j_la_cleanups);
      INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
      journal->j_state = OCFS2_JOURNAL_FREE;

      /* get some pseudo constants for clustersize bits */
      osb->s_clustersize_bits =
            le32_to_cpu(di->id2.i_super.s_clustersize_bits);
      osb->s_clustersize = 1 << osb->s_clustersize_bits;
      mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);

      if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
          osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
            mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
                 osb->s_clustersize);
            status = -EINVAL;
            goto bail;
      }

      if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
          > (u32)~0UL) {
            mlog(ML_ERROR, "Volume might try to write to blocks beyond "
                 "what jbd can address in 32 bits.\n");
            status = -EINVAL;
            goto bail;
      }

      if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
                         sizeof(di->id2.i_super.s_uuid))) {
            mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
            status = -ENOMEM;
            goto bail;
      }

      memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
      osb->net_key = le32_to_cpu(uuid_net_key);

      strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
      osb->vol_label[63] = '\0';
      osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
      osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
      osb->first_cluster_group_blkno =
            le64_to_cpu(di->id2.i_super.s_first_cluster_group);
      osb->fs_generation = le32_to_cpu(di->i_fs_generation);
      mlog(0, "vol_label: %s\n", osb->vol_label);
      mlog(0, "uuid: %s\n", osb->uuid_str);
      mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
           (unsigned long long)osb->root_blkno,
           (unsigned long long)osb->system_dir_blkno);

      osb->osb_dlm_debug = ocfs2_new_dlm_debug();
      if (!osb->osb_dlm_debug) {
            status = -ENOMEM;
            mlog_errno(status);
            goto bail;
      }

      atomic_set(&osb->vol_state, VOLUME_INIT);

      /* load root, system_dir, and all global system inodes */
      status = ocfs2_init_global_system_inodes(osb);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      /*
       * global bitmap
       */
      inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
                                  OCFS2_INVALID_SLOT);
      if (!inode) {
            status = -EINVAL;
            mlog_errno(status);
            goto bail;
      }

      osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;

      /* We don't have a cluster lock on the bitmap here because
       * we're only interested in static information and the extra
       * complexity at mount time isn't worht it. Don't pass the
       * inode in to the read function though as we don't want it to
       * be put in the cache. */
      status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
                          NULL);
      iput(inode);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      di = (struct ocfs2_dinode *) bitmap_bh->b_data;
      osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
      brelse(bitmap_bh);
      mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
           (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);

      status = ocfs2_init_slot_info(osb);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

bail:
      mlog_exit(status);
      return status;
}

/*
 * will return: -EAGAIN if it is ok to keep searching for superblocks
 *              -EINVAL if there is a bad superblock
 *              0 on success
 */
static int ocfs2_verify_volume(struct ocfs2_dinode *di,
                         struct buffer_head *bh,
                         u32 blksz)
{
      int status = -EAGAIN;

      mlog_entry_void();

      if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
               strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
            status = -EINVAL;
            if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
                  mlog(ML_ERROR, "found superblock with incorrect block "
                       "size: found %u, should be %u\n",
                       1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
                         blksz);
            } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
                     OCFS2_MAJOR_REV_LEVEL ||
                     le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
                     OCFS2_MINOR_REV_LEVEL) {
                  mlog(ML_ERROR, "found superblock with bad version: "
                       "found %u.%u, should be %u.%u\n",
                       le16_to_cpu(di->id2.i_super.s_major_rev_level),
                       le16_to_cpu(di->id2.i_super.s_minor_rev_level),
                       OCFS2_MAJOR_REV_LEVEL,
                       OCFS2_MINOR_REV_LEVEL);
            } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
                  mlog(ML_ERROR, "bad block number on superblock: "
                       "found %llu, should be %llu\n",
                       (unsigned long long)le64_to_cpu(di->i_blkno),
                       (unsigned long long)bh->b_blocknr);
            } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
                      le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
                  mlog(ML_ERROR, "bad cluster size found: %u\n",
                       1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
            } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
                  mlog(ML_ERROR, "bad root_blkno: 0\n");
            } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
                  mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
            } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
                  mlog(ML_ERROR,
                       "Superblock slots found greater than file system "
                       "maximum: found %u, max %u\n",
                       le16_to_cpu(di->id2.i_super.s_max_slots),
                       OCFS2_MAX_SLOTS);
            } else {
                  /* found it! */
                  status = 0;
            }
      }

      mlog_exit(status);
      return status;
}

static int ocfs2_check_volume(struct ocfs2_super *osb)
{
      int status;
      int dirty;
      int local;
      struct ocfs2_dinode *local_alloc = NULL; /* only used if we
                                      * recover
                                      * ourselves. */

      mlog_entry_void();

      /* Init our journal object. */
      status = ocfs2_journal_init(osb->journal, &dirty);
      if (status < 0) {
            mlog(ML_ERROR, "Could not initialize journal!\n");
            goto finally;
      }

      /* If the journal was unmounted cleanly then we don't want to
       * recover anything. Otherwise, journal_load will do that
       * dirty work for us :) */
      if (!dirty) {
            status = ocfs2_journal_wipe(osb->journal, 0);
            if (status < 0) {
                  mlog_errno(status);
                  goto finally;
            }
      } else {
            mlog(ML_NOTICE, "File system was not unmounted cleanly, "
                 "recovering volume.\n");
      }

      local = ocfs2_mount_local(osb);

      /* will play back anything left in the journal. */
      ocfs2_journal_load(osb->journal, local);

      if (dirty) {
            /* recover my local alloc if we didn't unmount cleanly. */
            status = ocfs2_begin_local_alloc_recovery(osb,
                                            osb->slot_num,
                                            &local_alloc);
            if (status < 0) {
                  mlog_errno(status);
                  goto finally;
            }
            /* we complete the recovery process after we've marked
             * ourselves as mounted. */
      }

      mlog(0, "Journal loaded.\n");

      status = ocfs2_load_local_alloc(osb);
      if (status < 0) {
            mlog_errno(status);
            goto finally;
      }

      if (dirty) {
            /* Recovery will be completed after we've mounted the
             * rest of the volume. */
            osb->dirty = 1;
            osb->local_alloc_copy = local_alloc;
            local_alloc = NULL;
      }

      /* go through each journal, trylock it and if you get the
       * lock, and it's marked as dirty, set the bit in the recover
       * map and launch a recovery thread for it. */
      status = ocfs2_mark_dead_nodes(osb);
      if (status < 0)
            mlog_errno(status);

finally:
      if (local_alloc)
            kfree(local_alloc);

      mlog_exit(status);
      return status;
}

/*
 * The routine gets called from dismount or close whenever a dismount on
 * volume is requested and the osb open count becomes 1.
 * It will remove the osb from the global list and also free up all the
 * initialized resources and fileobject.
 */
static void ocfs2_delete_osb(struct ocfs2_super *osb)
{
      mlog_entry_void();

      /* This function assumes that the caller has the main osb resource */

      if (osb->slot_info)
            ocfs2_free_slot_info(osb->slot_info);

      kfree(osb->osb_orphan_wipes);
      /* FIXME
       * This belongs in journal shutdown, but because we have to
       * allocate osb->journal at the start of ocfs2_initalize_osb(),
       * we free it here.
       */
      kfree(osb->journal);
      if (osb->local_alloc_copy)
            kfree(osb->local_alloc_copy);
      kfree(osb->uuid_str);
      ocfs2_put_dlm_debug(osb->osb_dlm_debug);
      memset(osb, 0, sizeof(struct ocfs2_super));

      mlog_exit_void();
}

/* Put OCFS2 into a readonly state, or (if the user specifies it),
 * panic(). We do not support continue-on-error operation. */
static void ocfs2_handle_error(struct super_block *sb)
{
      struct ocfs2_super *osb = OCFS2_SB(sb);

      if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
            panic("OCFS2: (device %s): panic forced after error\n",
                  sb->s_id);

      ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);

      if (sb->s_flags & MS_RDONLY &&
          (ocfs2_is_soft_readonly(osb) ||
           ocfs2_is_hard_readonly(osb)))
            return;

      printk(KERN_CRIT "File system is now read-only due to the potential "
             "of on-disk corruption. Please run fsck.ocfs2 once the file "
             "system is unmounted.\n");
      sb->s_flags |= MS_RDONLY;
      ocfs2_set_ro_flag(osb, 0);
}

static char error_buf[1024];

void __ocfs2_error(struct super_block *sb,
               const char *function,
               const char *fmt, ...)
{
      va_list args;

      va_start(args, fmt);
      vsnprintf(error_buf, sizeof(error_buf), fmt, args);
      va_end(args);

      /* Not using mlog here because we want to show the actual
       * function the error came from. */
      printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
             sb->s_id, function, error_buf);

      ocfs2_handle_error(sb);
}

/* Handle critical errors. This is intentionally more drastic than
 * ocfs2_handle_error, so we only use for things like journal errors,
 * etc. */
void __ocfs2_abort(struct super_block* sb,
               const char *function,
               const char *fmt, ...)
{
      va_list args;

      va_start(args, fmt);
      vsnprintf(error_buf, sizeof(error_buf), fmt, args);
      va_end(args);

      printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
             sb->s_id, function, error_buf);

      /* We don't have the cluster support yet to go straight to
       * hard readonly in here. Until then, we want to keep
       * ocfs2_abort() so that we can at least mark critical
       * errors.
       *
       * TODO: This should abort the journal and alert other nodes
       * that our slot needs recovery. */

      /* Force a panic(). This stinks, but it's better than letting
       * things continue without having a proper hard readonly
       * here. */
      OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
      ocfs2_handle_error(sb);
}

module_init(ocfs2_init);
module_exit(ocfs2_exit);

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