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 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * super.c
  *
  * load/unload driver, mount/dismount volumes
  *
  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  */
 
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.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 <linux/seq_file.h>
 #include <linux/quotaops.h>
 #include <linux/signal.h>
 
 #define CREATE_TRACE_POINTS
 #include "ocfs2_trace.h"
 
 #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 "aops.h"
 #include "blockcheck.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 "xattr.h"
 #include "quota.h"
 #include "refcounttree.h"
 #include "suballoc.h"
 
 #include "buffer_head_io.h"
 #include "filecheck.h"
 
 static struct kmem_cache *ocfs2_inode_cachep;
 struct kmem_cache *ocfs2_dquot_cachep;
 struct kmem_cache *ocfs2_qf_chunk_cachep;
 
 static struct dentry *ocfs2_debugfs_root;
 
 MODULE_AUTHOR("Oracle");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("OCFS2 cluster file system");
 
 struct mount_options
 {
     unsigned long   commit_interval;
     unsigned long   mount_opt;
     unsigned int    atime_quantum;
     unsigned short  slot;
     int     localalloc_opt;
     unsigned int    resv_level;
     int     dir_resv_level;
     char        cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
 };
 
 static int ocfs2_parse_options(struct super_block *sb, char *options,
                    struct mount_options *mopt,
                    int is_remount);
 static int ocfs2_check_set_options(struct super_block *sb,
                    struct mount_options *options);
 static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
 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_check_volume(struct ocfs2_super *osb);
 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
                    struct buffer_head *bh,
                    u32 sectsize,
                    struct ocfs2_blockcheck_stats *stats);
 static int ocfs2_initialize_super(struct super_block *sb,
                   struct buffer_head *bh,
                   int sector_size,
                   struct ocfs2_blockcheck_stats *stats);
 static int ocfs2_get_sector(struct super_block *sb,
                 struct buffer_head **bh,
                 int block,
                 int sect_size);
 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 static void ocfs2_free_inode(struct inode *inode);
 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
 
 static struct dquot **ocfs2_get_dquots(struct inode *inode)
 {
     return OCFS2_I(inode)->i_dquot;
 }
 
 static const struct super_operations ocfs2_sops = {
     .statfs     = ocfs2_statfs,
     .alloc_inode    = ocfs2_alloc_inode,
     .free_inode = ocfs2_free_inode,
     .drop_inode = ocfs2_drop_inode,
     .evict_inode    = ocfs2_evict_inode,
     .sync_fs    = ocfs2_sync_fs,
     .put_super  = ocfs2_put_super,
     .remount_fs = ocfs2_remount,
     .show_options   = ocfs2_show_options,
     .quota_read = ocfs2_quota_read,
     .quota_write    = ocfs2_quota_write,
     .get_dquots = ocfs2_get_dquots,
 };
 
 enum {
     Opt_barrier,
     Opt_err_panic,
     Opt_err_ro,
     Opt_intr,
     Opt_nointr,
     Opt_hb_none,
     Opt_hb_local,
     Opt_hb_global,
     Opt_data_ordered,
     Opt_data_writeback,
     Opt_atime_quantum,
     Opt_slot,
     Opt_commit,
     Opt_localalloc,
     Opt_localflocks,
     Opt_stack,
     Opt_user_xattr,
     Opt_nouser_xattr,
     Opt_inode64,
     Opt_acl,
     Opt_noacl,
     Opt_usrquota,
     Opt_grpquota,
     Opt_coherency_buffered,
     Opt_coherency_full,
     Opt_resv_level,
     Opt_dir_resv_level,
     Opt_journal_async_commit,
     Opt_err_cont,
     Opt_err,
 };
 
 static const 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_hb_global, OCFS2_HB_GLOBAL},
     {Opt_data_ordered, "data=ordered"},
     {Opt_data_writeback, "data=writeback"},
     {Opt_atime_quantum, "atime_quantum=%u"},
     {Opt_slot, "preferred_slot=%u"},
     {Opt_commit, "commit=%u"},
     {Opt_localalloc, "localalloc=%d"},
     {Opt_localflocks, "localflocks"},
     {Opt_stack, "cluster_stack=%s"},
     {Opt_user_xattr, "user_xattr"},
     {Opt_nouser_xattr, "nouser_xattr"},
     {Opt_inode64, "inode64"},
     {Opt_acl, "acl"},
     {Opt_noacl, "noacl"},
     {Opt_usrquota, "usrquota"},
     {Opt_grpquota, "grpquota"},
     {Opt_coherency_buffered, "coherency=buffered"},
     {Opt_coherency_full, "coherency=full"},
     {Opt_resv_level, "resv_level=%u"},
     {Opt_dir_resv_level, "dir_resv_level=%u"},
     {Opt_journal_async_commit, "journal_async_commit"},
     {Opt_err_cont, "errors=continue"},
     {Opt_err, NULL}
 };
 
 #ifdef CONFIG_DEBUG_FS
 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
 {
     struct ocfs2_cluster_connection *cconn = osb->cconn;
     struct ocfs2_recovery_map *rm = osb->recovery_map;
     struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
     int i, out = 0;
     unsigned long flags;
 
     out += scnprintf(buf + out, len - out,
             "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
             "Device", osb->dev_str, osb->uuid_str,
             osb->fs_generation, osb->vol_label);
 
     out += scnprintf(buf + out, len - out,
             "%10s => State: %d  Flags: 0x%lX\n", "Volume",
             atomic_read(&osb->vol_state), osb->osb_flags);
 
     out += scnprintf(buf + out, len - out,
             "%10s => Block: %lu  Cluster: %d\n", "Sizes",
             osb->sb->s_blocksize, osb->s_clustersize);
 
     out += scnprintf(buf + out, len - out,
             "%10s => Compat: 0x%X  Incompat: 0x%X  "
             "ROcompat: 0x%X\n",
             "Features", osb->s_feature_compat,
             osb->s_feature_incompat, osb->s_feature_ro_compat);
 
     out += scnprintf(buf + out, len - out,
             "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
             osb->s_mount_opt, osb->s_atime_quantum);
 
     if (cconn) {
         out += scnprintf(buf + out, len - out,
                 "%10s => Stack: %s  Name: %*s  "
                 "Version: %d.%d\n", "Cluster",
                 (*osb->osb_cluster_stack == '\0' ?
                  "o2cb" : osb->osb_cluster_stack),
                 cconn->cc_namelen, cconn->cc_name,
                 cconn->cc_version.pv_major,
                 cconn->cc_version.pv_minor);
     }
 
     spin_lock_irqsave(&osb->dc_task_lock, flags);
     out += scnprintf(buf + out, len - out,
             "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
             "WorkSeq: %lu\n", "DownCnvt",
             (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
             osb->blocked_lock_count, osb->dc_wake_sequence,
             osb->dc_work_sequence);
     spin_unlock_irqrestore(&osb->dc_task_lock, flags);
 
     spin_lock(&osb->osb_lock);
     out += scnprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
             "Recovery",
             (osb->recovery_thread_task ?
              task_pid_nr(osb->recovery_thread_task) : -1));
     if (rm->rm_used == 0)
         out += scnprintf(buf + out, len - out, " None\n");
     else {
         for (i = 0; i < rm->rm_used; i++)
             out += scnprintf(buf + out, len - out, " %d",
                     rm->rm_entries[i]);
         out += scnprintf(buf + out, len - out, "\n");
     }
     spin_unlock(&osb->osb_lock);
 
     out += scnprintf(buf + out, len - out,
             "%10s => Pid: %d  Interval: %lu\n", "Commit",
             (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
             osb->osb_commit_interval);
 
     out += scnprintf(buf + out, len - out,
             "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
             "Journal", osb->journal->j_state,
             osb->journal->j_trans_id,
             atomic_read(&osb->journal->j_num_trans));
 
     out += scnprintf(buf + out, len - out,
             "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
             "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
             "Stats",
             atomic_read(&osb->alloc_stats.bitmap_data),
             atomic_read(&osb->alloc_stats.local_data),
             atomic_read(&osb->alloc_stats.bg_allocs),
             atomic_read(&osb->alloc_stats.moves),
             atomic_read(&osb->alloc_stats.bg_extends));
 
     out += scnprintf(buf + out, len - out,
             "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
             "Default: %u bits\n",
             "LocalAlloc", osb->local_alloc_state,
             (unsigned long long)osb->la_last_gd,
             osb->local_alloc_bits, osb->local_alloc_default_bits);
 
     spin_lock(&osb->osb_lock);
     out += scnprintf(buf + out, len - out,
             "%10s => InodeSlot: %d  StolenInodes: %d, "
             "MetaSlot: %d  StolenMeta: %d\n", "Steal",
             osb->s_inode_steal_slot,
             atomic_read(&osb->s_num_inodes_stolen),
             osb->s_meta_steal_slot,
             atomic_read(&osb->s_num_meta_stolen));
     spin_unlock(&osb->osb_lock);
 
     out += scnprintf(buf + out, len - out, "OrphanScan => ");
     out += scnprintf(buf + out, len - out, "Local: %u  Global: %u ",
             os->os_count, os->os_seqno);
     out += scnprintf(buf + out, len - out, " Last Scan: ");
     if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
         out += scnprintf(buf + out, len - out, "Disabled\n");
     else
         out += scnprintf(buf + out, len - out, "%lu seconds ago\n",
                 (unsigned long)(ktime_get_seconds() - os->os_scantime));
 
     out += scnprintf(buf + out, len - out, "%10s => %3s  %10s\n",
             "Slots", "Num", "RecoGen");
     for (i = 0; i < osb->max_slots; ++i) {
         out += scnprintf(buf + out, len - out,
                 "%10s  %c %3d  %10d\n",
                 " ",
                 (i == osb->slot_num ? '*' : ' '),
                 i, osb->slot_recovery_generations[i]);
     }
 
     return out;
 }
 
 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 {
     struct ocfs2_super *osb = inode->i_private;
     char *buf = NULL;
 
     buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
     if (!buf)
         goto bail;
 
     i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
 
     file->private_data = buf;
 
     return 0;
 bail:
     return -ENOMEM;
 }
 
 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 {
     kfree(file->private_data);
     return 0;
 }
 
 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
                 size_t nbytes, loff_t *ppos)
 {
     return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
                        i_size_read(file->f_mapping->host));
 }
 #else
 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
 {
     return 0;
 }
 static int ocfs2_debug_release(struct inode *inode, struct file *file)
 {
     return 0;
 }
 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
                 size_t nbytes, loff_t *ppos)
 {
     return 0;
 }
 #endif  /* CONFIG_DEBUG_FS */
 
 static const struct file_operations ocfs2_osb_debug_fops = {
     .open =     ocfs2_osb_debug_open,
     .release =  ocfs2_debug_release,
     .read =     ocfs2_debug_read,
     .llseek =   generic_file_llseek,
 };
 
 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 {
     int status;
     tid_t target;
     struct ocfs2_super *osb = OCFS2_SB(sb);
 
     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 (jbd2_journal_start_commit(osb->journal->j_journal,
                       &target)) {
         if (wait)
             jbd2_log_wait_commit(osb->journal->j_journal,
                          target);
     }
     return 0;
 }
 
 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 {
     if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
         && (ino == USER_QUOTA_SYSTEM_INODE
         || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
         return 0;
     if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
         && (ino == GROUP_QUOTA_SYSTEM_INODE
         || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
         return 0;
     return 1;
 }
 
 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 {
     struct inode *new = NULL;
     int status = 0;
     int i;
 
     new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
     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, 0);
     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++) {
         if (!ocfs2_need_system_inode(osb, i))
             continue;
         new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
         if (!new) {
             ocfs2_release_system_inodes(osb);
             status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
             mlog_errno(status);
             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:
     if (status)
         mlog_errno(status);
     return status;
 }
 
 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 {
     struct inode *new = NULL;
     int status = 0;
     int i;
 
     for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
          i < NUM_SYSTEM_INODES;
          i++) {
         if (!ocfs2_need_system_inode(osb, i))
             continue;
         new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
         if (!new) {
             ocfs2_release_system_inodes(osb);
             status = ocfs2_is_soft_readonly(osb) ? -EROFS : -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:
     if (status)
         mlog_errno(status);
     return status;
 }
 
 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 {
     int i;
     struct inode *inode;
 
     for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
         inode = osb->global_system_inodes[i];
         if (inode) {
             iput(inode);
             osb->global_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;
     }
 
     if (!osb->local_system_inodes)
         return;
 
     for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
         if (osb->local_system_inodes[i]) {
             iput(osb->local_system_inodes[i]);
             osb->local_system_inodes[i] = NULL;
         }
     }
 
     kfree(osb->local_system_inodes);
     osb->local_system_inodes = NULL;
 }
 
 /* We're allocating fs objects, use GFP_NOFS */
 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 {
     struct ocfs2_inode_info *oi;
 
     oi = alloc_inode_sb(sb, ocfs2_inode_cachep, GFP_NOFS);
     if (!oi)
         return NULL;
 
     oi->i_sync_tid = 0;
     oi->i_datasync_tid = 0;
     memset(&oi->i_dquot, 0, sizeof(oi->i_dquot));
 
     jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
     return &oi->vfs_inode;
 }
 
 static void ocfs2_free_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
     BUILD_BUG_ON(sizeof(sector_t) != 8);
     /*
      * We might be limited by page cache size.
      */
     if (bytes > PAGE_SIZE) {
         bytes = PAGE_SIZE;
         trim = 1;
         /*
          * Shift by 31 here so that we don't get larger than
          * MAX_LFS_FILESIZE
          */
         bitshift = 31;
     }
 #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);
     u32 tmp;
 
     sync_filesystem(sb);
 
     if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
         !ocfs2_check_set_options(sb, &parsed_options)) {
         ret = -EINVAL;
         goto out;
     }
 
     tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
         OCFS2_MOUNT_HB_NONE;
     if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
         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;
     }
 
     /* Probably don't want this on remount; it might
      * mess with other nodes */
     if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
         (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
         ret = -EINVAL;
         mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
         goto out;
     }
 
     /* We're going to/from readonly mode. */
     if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
         /* Disable quota accounting before remounting RO */
         if (*flags & SB_RDONLY) {
             ret = ocfs2_susp_quotas(osb, 0);
             if (ret < 0)
                 goto out;
         }
         /* 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 & SB_RDONLY) {
             sb->s_flags |= SB_RDONLY;
             osb->osb_flags |= OCFS2_OSB_SOFT_RO;
         } else {
             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 &= ~SB_RDONLY;
             osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
         }
         trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
 unlock_osb:
         spin_unlock(&osb->osb_lock);
         /* Enable quota accounting after remounting RW */
         if (!ret && !(*flags & SB_RDONLY)) {
             if (sb_any_quota_suspended(sb))
                 ret = ocfs2_susp_quotas(osb, 1);
             else
                 ret = ocfs2_enable_quotas(osb);
             if (ret < 0) {
                 /* Return back changes... */
                 spin_lock(&osb->osb_lock);
                 sb->s_flags |= SB_RDONLY;
                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
                 spin_unlock(&osb->osb_lock);
                 goto out;
             }
         }
     }
 
     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 (parsed_options.commit_interval)
             osb->osb_commit_interval = parsed_options.commit_interval;
 
         if (!ocfs2_is_hard_readonly(osb))
             ocfs2_set_journal_params(osb);
 
         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
             ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
                             SB_POSIXACL : 0);
     }
 out:
     return ret;
 }
 
 static int ocfs2_sb_probe(struct super_block *sb,
               struct buffer_head **bh,
               int *sector_size,
               struct ocfs2_blockcheck_stats *stats)
 {
     int status, tmpstat;
     struct ocfs1_vol_disk_hdr *hdr;
     struct ocfs2_dinode *di;
     int blksize;
 
     *bh = NULL;
 
     /* may be > 512 */
     *sector_size = bdev_logical_block_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);
             break;
         }
         di = (struct ocfs2_dinode *) (*bh)->b_data;
         memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
         spin_lock_init(&stats->b_lock);
         tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
         if (tmpstat < 0) {
             brelse(*bh);
             *bh = NULL;
         }
         if (tmpstat != -EAGAIN) {
             status = tmpstat;
             break;
         }
     }
 
 bail:
     return status;
 }
 
 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 {
     u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
 
     if (osb->s_mount_opt & hb_enabled) {
         if (ocfs2_mount_local(osb)) {
             mlog(ML_ERROR, "Cannot heartbeat on a locally "
                  "mounted device.\n");
             return -EINVAL;
         }
         if (ocfs2_userspace_stack(osb)) {
             mlog(ML_ERROR, "Userspace stack expected, but "
                  "o2cb heartbeat arguments passed to mount\n");
             return -EINVAL;
         }
         if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
              !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
             ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
              ocfs2_cluster_o2cb_global_heartbeat(osb))) {
             mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
             return -EINVAL;
         }
     }
 
     if (!(osb->s_mount_opt & hb_enabled)) {
         if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
             !ocfs2_userspace_stack(osb)) {
             mlog(ML_ERROR, "Heartbeat has to be started to mount "
                  "a read-write clustered device.\n");
             return -EINVAL;
         }
     }
 
     return 0;
 }
 
 /*
  * If we're using a userspace stack, mount should have passed
  * a name that matches the disk.  If not, mount should not
  * have passed a stack.
  */
 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
                     struct mount_options *mopt)
 {
     if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
         mlog(ML_ERROR,
              "cluster stack passed to mount, but this filesystem "
              "does not support it\n");
         return -EINVAL;
     }
 
     if (ocfs2_userspace_stack(osb) &&
         strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
             OCFS2_STACK_LABEL_LEN)) {
         mlog(ML_ERROR,
              "cluster stack passed to mount (\"%s\") does not "
              "match the filesystem (\"%s\")\n",
              mopt->cluster_stack,
              osb->osb_cluster_stack);
         return -EINVAL;
     }
 
     return 0;
 }
 
 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
 {
     int type;
     struct super_block *sb = osb->sb;
     unsigned int feature[OCFS2_MAXQUOTAS] = {
                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
     int status = 0;
 
     for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
             continue;
         if (unsuspend)
             status = dquot_resume(sb, type);
         else {
             struct ocfs2_mem_dqinfo *oinfo;
 
             /* Cancel periodic syncing before suspending */
             oinfo = sb_dqinfo(sb, type)->dqi_priv;
             cancel_delayed_work_sync(&oinfo->dqi_sync_work);
             status = dquot_suspend(sb, type);
         }
         if (status < 0)
             break;
     }
     if (status < 0)
         mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
              "remount (error = %d).\n", status);
     return status;
 }
 
 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
 {
     struct inode *inode[OCFS2_MAXQUOTAS] = { NULL, NULL };
     struct super_block *sb = osb->sb;
     unsigned int feature[OCFS2_MAXQUOTAS] = {
                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
     unsigned int ino[OCFS2_MAXQUOTAS] = {
                     LOCAL_USER_QUOTA_SYSTEM_INODE,
                     LOCAL_GROUP_QUOTA_SYSTEM_INODE };
     int status;
     int type;
 
     sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
     for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
             continue;
         inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
                             osb->slot_num);
         if (!inode[type]) {
             status = -ENOENT;
             goto out_quota_off;
         }
         status = dquot_load_quota_inode(inode[type], type, QFMT_OCFS2,
                         DQUOT_USAGE_ENABLED);
         if (status < 0)
             goto out_quota_off;
     }
 
     for (type = 0; type < OCFS2_MAXQUOTAS; type++)
         iput(inode[type]);
     return 0;
 out_quota_off:
     ocfs2_disable_quotas(osb);
     for (type = 0; type < OCFS2_MAXQUOTAS; type++)
         iput(inode[type]);
     mlog_errno(status);
     return status;
 }
 
 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
 {
     int type;
     struct inode *inode;
     struct super_block *sb = osb->sb;
     struct ocfs2_mem_dqinfo *oinfo;
 
     /* We mostly ignore errors in this function because there's not much
      * we can do when we see them */
     for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
         if (!sb_has_quota_loaded(sb, type))
             continue;
         oinfo = sb_dqinfo(sb, type)->dqi_priv;
         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
         inode = igrab(sb->s_dquot.files[type]);
         /* Turn off quotas. This will remove all dquot structures from
          * memory and so they will be automatically synced to global
          * quota files */
         dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
                     DQUOT_LIMITS_ENABLED);
         iput(inode);
     }
 }
 
 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[12];
     struct ocfs2_blockcheck_stats stats;
 
     trace_ocfs2_fill_super(sb, data, silent);
 
     if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
         status = -EINVAL;
         goto out;
     }
 
     /* probe for superblock */
     status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
     if (status < 0) {
         mlog(ML_ERROR, "superblock probe failed!\n");
         goto out;
     }
 
     status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
     brelse(bh);
     bh = NULL;
     if (status < 0)
         goto out;
 
     osb = OCFS2_SB(sb);
 
     if (!ocfs2_check_set_options(sb, &parsed_options)) {
         status = -EINVAL;
         goto out_super;
     }
     osb->s_mount_opt = parsed_options.mount_opt;
     osb->s_atime_quantum = parsed_options.atime_quantum;
     osb->preferred_slot = parsed_options.slot;
     osb->osb_commit_interval = parsed_options.commit_interval;
 
     ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
     osb->osb_resv_level = parsed_options.resv_level;
     osb->osb_dir_resv_level = parsed_options.resv_level;
     if (parsed_options.dir_resv_level == -1)
         osb->osb_dir_resv_level = parsed_options.resv_level;
     else
         osb->osb_dir_resv_level = parsed_options.dir_resv_level;
 
     status = ocfs2_verify_userspace_stack(osb, &parsed_options);
     if (status)
         goto out_super;
 
     sb->s_magic = OCFS2_SUPER_MAGIC;
 
     sb->s_flags = (sb->s_flags & ~(SB_POSIXACL | SB_NOSEC)) |
         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
 
     /* Hard readonly mode only if: bdev_read_only, SB_RDONLY,
      * heartbeat=none */
     if (bdev_read_only(sb->s_bdev)) {
         if (!sb_rdonly(sb)) {
             status = -EACCES;
             mlog(ML_ERROR, "Readonly device detected but readonly "
                  "mount was not specified.\n");
             goto out_super;
         }
 
         /* 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 out_super;
         }
 
         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");
             goto out_super;
         }
 
         ocfs2_set_ro_flag(osb, 1);
 
         printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
                "Cluster services will not be used for this mount. "
                "Recovery will be skipped.\n", osb->dev_str);
     }
 
     if (!ocfs2_is_hard_readonly(osb)) {
         if (sb_rdonly(sb))
             ocfs2_set_ro_flag(osb, 0);
     }
 
     status = ocfs2_verify_heartbeat(osb);
     if (status < 0)
         goto out_super;
 
     osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
                          ocfs2_debugfs_root);
 
     debugfs_create_file("fs_state", S_IFREG|S_IRUSR, osb->osb_debug_root,
                 osb, &ocfs2_osb_debug_fops);
 
     if (ocfs2_meta_ecc(osb))
         ocfs2_blockcheck_stats_debugfs_install( &osb->osb_ecc_stats,
                             osb->osb_debug_root);
 
     status = ocfs2_mount_volume(sb);
     if (status < 0)
         goto out_debugfs;
 
     if (osb->root_inode)
         inode = igrab(osb->root_inode);
 
     if (!inode) {
         status = -EIO;
         goto out_dismount;
     }
 
     osb->osb_dev_kset = kset_create_and_add(sb->s_id, NULL,
                         &ocfs2_kset->kobj);
     if (!osb->osb_dev_kset) {
         status = -ENOMEM;
         mlog(ML_ERROR, "Unable to create device kset %s.\n", sb->s_id);
         goto out_dismount;
     }
 
     /* Create filecheck sysfs related directories/files at
      * /sys/fs/ocfs2/<devname>/filecheck */
     if (ocfs2_filecheck_create_sysfs(osb)) {
         status = -ENOMEM;
         mlog(ML_ERROR, "Unable to create filecheck sysfs directory at "
             "/sys/fs/ocfs2/%s/filecheck.\n", sb->s_id);
         goto out_dismount;
     }
 
     root = d_make_root(inode);
     if (!root) {
         status = -ENOMEM;
         goto out_dismount;
     }
 
     sb->s_root = root;
 
     ocfs2_complete_mount_recovery(osb);
 
     if (ocfs2_mount_local(osb))
         snprintf(nodestr, sizeof(nodestr), "local");
     else
         snprintf(nodestr, sizeof(nodestr), "%u", 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);
 
     /* Now we can initialize quotas because we can afford to wait
      * for cluster locks recovery now. That also means that truncation
      * log recovery can happen but that waits for proper quota setup */
     if (!sb_rdonly(sb)) {
         status = ocfs2_enable_quotas(osb);
         if (status < 0) {
             /* We have to err-out specially here because
              * s_root is already set */
             mlog_errno(status);
             atomic_set(&osb->vol_state, VOLUME_DISABLED);
             wake_up(&osb->osb_mount_event);
             return status;
         }
     }
 
     ocfs2_complete_quota_recovery(osb);
 
     /* Now we wake up again for processes waiting for quotas */
     atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
     wake_up(&osb->osb_mount_event);
 
     /* Start this when the mount is almost sure of being successful */
     ocfs2_orphan_scan_start(osb);
 
     return status;
 
 out_dismount:
     atomic_set(&osb->vol_state, VOLUME_DISABLED);
     wake_up(&osb->osb_mount_event);
     ocfs2_dismount_volume(sb, 1);
     goto out;
 
 out_debugfs:
     debugfs_remove_recursive(osb->osb_debug_root);
 out_super:
     ocfs2_release_system_inodes(osb);
     kfree(osb->recovery_map);
     ocfs2_delete_osb(osb);
     kfree(osb);
 out:
     mlog_errno(status);
 
     return status;
 }
 
 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
             int flags,
             const char *dev_name,
             void *data)
 {
     return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
 }
 
 static struct file_system_type ocfs2_fs_type = {
     .owner          = THIS_MODULE,
     .name           = "ocfs2",
     .mount          = ocfs2_mount,
     .kill_sb        = kill_block_super,
     .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
     .next           = NULL
 };
 MODULE_ALIAS_FS("ocfs2");
 
 static int ocfs2_check_set_options(struct super_block *sb,
                    struct mount_options *options)
 {
     if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
         !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
                      OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
         mlog(ML_ERROR, "User quotas were requested, but this "
              "filesystem does not have the feature enabled.\n");
         return 0;
     }
     if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
         !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
                      OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
         mlog(ML_ERROR, "Group quotas were requested, but this "
              "filesystem does not have the feature enabled.\n");
         return 0;
     }
     if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
         !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
         mlog(ML_ERROR, "ACL support requested but extended attributes "
              "feature is not enabled\n");
         return 0;
     }
     /* No ACL setting specified? Use XATTR feature... */
     if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
                     OCFS2_MOUNT_NO_POSIX_ACL))) {
         if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
             options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
         else
             options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
     }
     return 1;
 }
 
 static int ocfs2_parse_options(struct super_block *sb,
                    char *options,
                    struct mount_options *mopt,
                    int is_remount)
 {
     int status, user_stack = 0;
     char *p;
     u32 tmp;
     int token, option;
     substring_t args[MAX_OPT_ARGS];
 
     trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
 
     mopt->commit_interval = 0;
     mopt->mount_opt = OCFS2_MOUNT_NOINTR;
     mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
     mopt->slot = OCFS2_INVALID_SLOT;
     mopt->localalloc_opt = -1;
     mopt->cluster_stack[0] = '\0';
     mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
     mopt->dir_resv_level = -1;
 
     if (!options) {
         status = 1;
         goto bail;
     }
 
     while ((p = strsep(&options, ",")) != NULL) {
         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_NONE;
             break;
         case Opt_hb_global:
             mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
             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_CONT;
             mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
             mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
             break;
         case Opt_err_ro:
             mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
             mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
             mopt->mount_opt |= OCFS2_MOUNT_ERRORS_ROFS;
             break;
         case Opt_err_cont:
             mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
             mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
             mopt->mount_opt |= OCFS2_MOUNT_ERRORS_CONT;
             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_user_xattr:
             mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
             break;
         case Opt_nouser_xattr:
             mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
             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:
             if (match_int(&args[0], &option)) {
                 status = 0;
                 goto bail;
             }
             if (option)
                 mopt->slot = (u16)option;
             break;
         case Opt_commit:
             if (match_int(&args[0], &option)) {
                 status = 0;
                 goto bail;
             }
             if (option < 0)
                 return 0;
             if (option == 0)
                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
             mopt->commit_interval = HZ * option;
             break;
         case Opt_localalloc:
             if (match_int(&args[0], &option)) {
                 status = 0;
                 goto bail;
             }
             if (option >= 0)
                 mopt->localalloc_opt = option;
             break;
         case Opt_localflocks:
             /*
              * Changing this during remount could race
              * flock() requests, or "unbalance" existing
              * ones (e.g., a lock is taken in one mode but
              * dropped in the other). If users care enough
              * to flip locking modes during remount, we
              * could add a "local" flag to individual
              * flock structures for proper tracking of
              * state.
              */
             if (!is_remount)
                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
             break;
         case Opt_stack:
             /* Check both that the option we were passed
              * is of the right length and that it is a proper
              * string of the right length.
              */
             if (((args[0].to - args[0].from) !=
                  OCFS2_STACK_LABEL_LEN) ||
                 (strnlen(args[0].from,
                      OCFS2_STACK_LABEL_LEN) !=
                  OCFS2_STACK_LABEL_LEN)) {
                 mlog(ML_ERROR,
                      "Invalid cluster_stack option\n");
                 status = 0;
                 goto bail;
             }
             memcpy(mopt->cluster_stack, args[0].from,
                    OCFS2_STACK_LABEL_LEN);
             mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
             /*
              * Open code the memcmp here as we don't have
              * an osb to pass to
              * ocfs2_userspace_stack().
              */
             if (memcmp(mopt->cluster_stack,
                    OCFS2_CLASSIC_CLUSTER_STACK,
                    OCFS2_STACK_LABEL_LEN))
                 user_stack = 1;
             break;
         case Opt_inode64:
             mopt->mount_opt |= OCFS2_MOUNT_INODE64;
             break;
         case Opt_usrquota:
             mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
             break;
         case Opt_grpquota:
             mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
             break;
         case Opt_coherency_buffered:
             mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
             break;
         case Opt_coherency_full:
             mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
             break;
         case Opt_acl:
             mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
             mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
             break;
         case Opt_noacl:
             mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
             mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
             break;
         case Opt_resv_level:
             if (is_remount)
                 break;
             if (match_int(&args[0], &option)) {
                 status = 0;
                 goto bail;
             }
             if (option >= OCFS2_MIN_RESV_LEVEL &&
                 option < OCFS2_MAX_RESV_LEVEL)
                 mopt->resv_level = option;
             break;
         case Opt_dir_resv_level:
             if (is_remount)
                 break;
             if (match_int(&args[0], &option)) {
                 status = 0;
                 goto bail;
             }
             if (option >= OCFS2_MIN_RESV_LEVEL &&
                 option < OCFS2_MAX_RESV_LEVEL)
                 mopt->dir_resv_level = option;
             break;
         case Opt_journal_async_commit:
             mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;
             break;
         default:
             mlog(ML_ERROR,
                  "Unrecognized mount option \"%s\" "
                  "or missing value\n", p);
             status = 0;
             goto bail;
         }
     }
 
     if (user_stack == 0) {
         /* Ensure only one heartbeat mode */
         tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
                      OCFS2_MOUNT_HB_GLOBAL |
                      OCFS2_MOUNT_HB_NONE);
         if (hweight32(tmp) != 1) {
             mlog(ML_ERROR, "Invalid heartbeat mount options\n");
             status = 0;
             goto bail;
         }
     }
 
     status = 1;
 
 bail:
     return status;
 }
 
 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
 {
     struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
     unsigned long opts = osb->s_mount_opt;
     unsigned int local_alloc_megs;
 
     if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
         seq_printf(s, ",_netdev");
         if (opts & OCFS2_MOUNT_HB_LOCAL)
             seq_printf(s, ",%s", OCFS2_HB_LOCAL);
         else
             seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
     } else
         seq_printf(s, ",%s", OCFS2_HB_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 if (opts & OCFS2_MOUNT_ERRORS_CONT)
         seq_printf(s, ",errors=continue");
     else
         seq_printf(s, ",errors=remount-ro");
 
     if (osb->preferred_slot != OCFS2_INVALID_SLOT)
         seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
 
     seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
 
     if (osb->osb_commit_interval)
         seq_printf(s, ",commit=%u",
                (unsigned) (osb->osb_commit_interval / HZ));
 
     local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
     if (local_alloc_megs != ocfs2_la_default_mb(osb))
         seq_printf(s, ",localalloc=%d", local_alloc_megs);
 
     if (opts & OCFS2_MOUNT_LOCALFLOCKS)
         seq_printf(s, ",localflocks,");
 
     if (osb->osb_cluster_stack[0])
         seq_show_option_n(s, "cluster_stack", osb->osb_cluster_stack,
                   OCFS2_STACK_LABEL_LEN);
     if (opts & OCFS2_MOUNT_USRQUOTA)
         seq_printf(s, ",usrquota");
     if (opts & OCFS2_MOUNT_GRPQUOTA)
         seq_printf(s, ",grpquota");
 
     if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
         seq_printf(s, ",coherency=buffered");
     else
         seq_printf(s, ",coherency=full");
 
     if (opts & OCFS2_MOUNT_NOUSERXATTR)
         seq_printf(s, ",nouser_xattr");
     else
         seq_printf(s, ",user_xattr");
 
     if (opts & OCFS2_MOUNT_INODE64)
         seq_printf(s, ",inode64");
 
     if (opts & OCFS2_MOUNT_POSIX_ACL)
         seq_printf(s, ",acl");
     else
         seq_printf(s, ",noacl");
 
     if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
         seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
 
     if (osb->osb_dir_resv_level != osb->osb_resv_level)
         seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
 
     if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
         seq_printf(s, ",journal_async_commit");
 
     return 0;
 }
 
 static int __init ocfs2_init(void)
 {
     int status;
 
     status = init_ocfs2_uptodate_cache();
     if (status < 0)
         goto out1;
 
     status = ocfs2_initialize_mem_caches();
     if (status < 0)
         goto out2;
 
     ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
 
     ocfs2_set_locking_protocol();
 
     status = register_quota_format(&ocfs2_quota_format);
     if (status < 0)
         goto out3;
     status = register_filesystem(&ocfs2_fs_type);
     if (!status)
         return 0;
 
     unregister_quota_format(&ocfs2_quota_format);
 out3:
     debugfs_remove(ocfs2_debugfs_root);
     ocfs2_free_mem_caches();
 out2:
     exit_ocfs2_uptodate_cache();
 out1:
     mlog_errno(status);
     return status;
 }
 
 static void __exit ocfs2_exit(void)
 {
     unregister_quota_format(&ocfs2_quota_format);
 
     debugfs_remove(ocfs2_debugfs_root);
 
     ocfs2_free_mem_caches();
 
     unregister_filesystem(&ocfs2_fs_type);
 
     exit_ocfs2_uptodate_cache();
 }
 
 static void ocfs2_put_super(struct super_block *sb)
 {
     trace_ocfs2_put_super(sb);
 
     ocfs2_sync_blockdev(sb);
     ocfs2_dismount_volume(sb, 0);
 }
 
 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;
 
     trace_ocfs2_statfs(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_inode_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;
     buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
                 & 0xFFFFFFFFUL;
     buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
 
     brelse(bh);
 
     ocfs2_inode_unlock(inode, 0);
     status = 0;
 bail:
     iput(inode);
 
     if (status)
         mlog_errno(status);
 
     return status;
 }
 
 static void ocfs2_inode_init_once(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);
     INIT_LIST_HEAD(&oi->ip_unwritten_list);
     oi->ip_dir_start_lookup = 0;
     init_rwsem(&oi->ip_alloc_sem);
     init_rwsem(&oi->ip_xattr_sem);
     mutex_init(&oi->ip_io_mutex);
 
     oi->ip_blkno = 0ULL;
     oi->ip_clusters = 0;
     oi->ip_next_orphan = NULL;
 
     ocfs2_resv_init_once(&oi->ip_la_data_resv);
 
     ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
     ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
     ocfs2_lock_res_init_once(&oi->ip_open_lockres);
 
     ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
                   &ocfs2_inode_caching_ops);
 
     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|SLAB_ACCOUNT),
                        ocfs2_inode_init_once);
     ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
                     sizeof(struct ocfs2_dquot),
                     0,
                     (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
                         SLAB_MEM_SPREAD),
                     NULL);
     ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
                     sizeof(struct ocfs2_quota_chunk),
                     0,
                     (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
                     NULL);
     if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
         !ocfs2_qf_chunk_cachep) {
         kmem_cache_destroy(ocfs2_inode_cachep);
         kmem_cache_destroy(ocfs2_dquot_cachep);
         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
         return -ENOMEM;
     }
 
     return 0;
 }
 
 static void ocfs2_free_mem_caches(void)
 {
     /*
      * Make sure all delayed rcu free inodes are flushed before we
      * destroy cache.
      */
     rcu_barrier();
     kmem_cache_destroy(ocfs2_inode_cachep);
     ocfs2_inode_cachep = NULL;
 
     kmem_cache_destroy(ocfs2_dquot_cachep);
     ocfs2_dquot_cachep = NULL;
 
     kmem_cache_destroy(ocfs2_qf_chunk_cachep);
     ocfs2_qf_chunk_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(-ENOMEM);
         return -ENOMEM;
     }
     lock_buffer(*bh);
     if (!buffer_dirty(*bh))
         clear_buffer_uptodate(*bh);
     unlock_buffer(*bh);
     ll_rw_block(REQ_OP_READ, 1, bh);
     wait_on_buffer(*bh);
     if (!buffer_uptodate(*bh)) {
         mlog_errno(-EIO);
         brelse(*bh);
         *bh = NULL;
         return -EIO;
     }
 
     return 0;
 }
 
 static int ocfs2_mount_volume(struct super_block *sb)
 {
     int status = 0;
     struct ocfs2_super *osb = OCFS2_SB(sb);
 
     if (ocfs2_is_hard_readonly(osb))
         goto out;
 
     mutex_init(&osb->obs_trim_fs_mutex);
 
     status = ocfs2_dlm_init(osb);
     if (status < 0) {
         mlog_errno(status);
         if (status == -EBADR && ocfs2_userspace_stack(osb))
             mlog(ML_ERROR, "couldn't mount because cluster name on"
             " disk does not match the running cluster name.\n");
         goto out;
     }
 
     status = ocfs2_super_lock(osb, 1);
     if (status < 0) {
         mlog_errno(status);
         goto out_dlm;
     }
 
     /* This will load up the node map and add ourselves to it. */
     status = ocfs2_find_slot(osb);
     if (status < 0) {
         mlog_errno(status);
         goto out_super_lock;
     }
 
     /* load all node-local system inodes */
     status = ocfs2_init_local_system_inodes(osb);
     if (status < 0) {
         mlog_errno(status);
         goto out_super_lock;
     }
 
     status = ocfs2_check_volume(osb);
     if (status < 0) {
         mlog_errno(status);
         goto out_system_inodes;
     }
 
     status = ocfs2_truncate_log_init(osb);
     if (status < 0) {
         mlog_errno(status);
         goto out_system_inodes;
     }
 
     ocfs2_super_unlock(osb, 1);
     return 0;
 
 out_system_inodes:
     if (osb->local_alloc_state == OCFS2_LA_ENABLED)
         ocfs2_shutdown_local_alloc(osb);
     ocfs2_release_system_inodes(osb);
     /* before journal shutdown, we should release slot_info */
     ocfs2_free_slot_info(osb);
     ocfs2_journal_shutdown(osb);
 out_super_lock:
     ocfs2_super_unlock(osb, 1);
 out_dlm:
     ocfs2_dlm_shutdown(osb, 0);
 out:
     return status;
 }
 
 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
 {
     int tmp, hangup_needed = 0;
     struct ocfs2_super *osb = NULL;
     char nodestr[12];
 
     trace_ocfs2_dismount_volume(sb);
 
     BUG_ON(!sb);
     osb = OCFS2_SB(sb);
     BUG_ON(!osb);
 
     /* Remove file check sysfs related directores/files,
      * and wait for the pending file check operations */
     ocfs2_filecheck_remove_sysfs(osb);
 
     kset_unregister(osb->osb_dev_kset);
 
     /* Orphan scan should be stopped as early as possible */
     ocfs2_orphan_scan_stop(osb);
 
     ocfs2_disable_quotas(osb);
 
     /* All dquots should be freed by now */
     WARN_ON(!llist_empty(&osb->dquot_drop_list));
     /* Wait for worker to be done with the work structure in osb */
     cancel_work_sync(&osb->dquot_drop_work);
 
     ocfs2_shutdown_local_alloc(osb);
 
     ocfs2_truncate_log_shutdown(osb);
 
     /* This will disable recovery and flush any recovery work. */
     ocfs2_recovery_exit(osb);
 
     ocfs2_sync_blockdev(sb);
 
     ocfs2_purge_refcount_trees(osb);
 
     /* No cluster connection means we've failed during mount, so skip
      * all the steps which depended on that to complete. */
     if (osb->cconn) {
         tmp = ocfs2_super_lock(osb, 1);
         if (tmp < 0) {
             mlog_errno(tmp);
             return;
         }
     }
 
     if (osb->slot_num != OCFS2_INVALID_SLOT)
         ocfs2_put_slot(osb);
 
     if (osb->cconn)
         ocfs2_super_unlock(osb, 1);
 
     ocfs2_release_system_inodes(osb);
 
     ocfs2_journal_shutdown(osb);
 
     /*
      * If we're dismounting due to mount error, mount.ocfs2 will clean
      * up heartbeat.  If we're a local mount, there is no heartbeat.
      * If we failed before we got a uuid_str yet, we can't stop
      * heartbeat.  Otherwise, do it.
      */
     if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
         !ocfs2_is_hard_readonly(osb))
         hangup_needed = 1;
 
     ocfs2_dlm_shutdown(osb, hangup_needed);
 
     ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
     debugfs_remove_recursive(osb->osb_debug_root);
 
     if (hangup_needed)
         ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
 
     atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
 
     if (ocfs2_mount_local(osb))
         snprintf(nodestr, sizeof(nodestr), "local");
     else
         snprintf(nodestr, sizeof(nodestr), "%u", 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;
 }
 
 /* Make sure entire volume is addressable by our journal.  Requires
    osb_clusters_at_boot to be valid and for the journal to have been
    initialized by ocfs2_journal_init(). */
 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
 {
     int status = 0;
     u64 max_block =
         ocfs2_clusters_to_blocks(osb->sb,
                      osb->osb_clusters_at_boot) - 1;
 
     /* 32-bit block number is always OK. */
     if (max_block <= (u32)~0ULL)
         goto out;
 
     /* Volume is "huge", so see if our journal is new enough to
        support it. */
     if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
           jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
                            JBD2_FEATURE_INCOMPAT_64BIT))) {
         mlog(ML_ERROR, "The journal cannot address the entire volume. "
              "Enable the 'block64' journal option with tunefs.ocfs2");
         status = -EFBIG;
         goto out;
     }
 
  out:
     return status;
 }
 
 static int ocfs2_initialize_super(struct super_block *sb,
                   struct buffer_head *bh,
                   int sector_size,
                   struct ocfs2_blockcheck_stats *stats)
 {
     int status;
     int i, cbits, bbits;
     struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
     struct inode *inode = NULL;
     struct ocfs2_super *osb;
     u64 total_blocks;
 
     osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
     if (!osb) {
         status = -ENOMEM;
         mlog_errno(status);
         goto out;
     }
 
     sb->s_fs_info = osb;
     sb->s_op = &ocfs2_sops;
     sb->s_d_op = &ocfs2_dentry_ops;
     sb->s_export_op = &ocfs2_export_ops;
     sb->s_qcop = &dquot_quotactl_sysfile_ops;
     sb->dq_op = &ocfs2_quota_operations;
     sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
     sb->s_xattr = ocfs2_xattr_handlers;
     sb->s_time_gran = 1;
     sb->s_flags |= SB_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);
     memcpy(&sb->s_uuid, di->id2.i_super.s_uuid,
            sizeof(di->id2.i_super.s_uuid));
 
     osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
 
     for (i = 0; i < 3; i++)
         osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
     osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
 
     osb->sb = sb;
     osb->s_sectsize_bits = blksize_bits(sector_size);
     BUG_ON(!osb->s_sectsize_bits);
 
     spin_lock_init(&osb->dc_task_lock);
     init_waitqueue_head(&osb->dc_event);
     osb->dc_work_sequence = 0;
     osb->dc_wake_sequence = 0;
     INIT_LIST_HEAD(&osb->blocked_lock_list);
     osb->blocked_lock_count = 0;
     spin_lock_init(&osb->osb_lock);
     spin_lock_init(&osb->osb_xattr_lock);
     ocfs2_init_steal_slots(osb);
 
     mutex_init(&osb->system_file_mutex);
 
     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);
 
     /* Copy the blockcheck stats from the superblock probe */
     osb->osb_ecc_stats = *stats;
 
     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));
 
     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 out;
     }
 
     ocfs2_orphan_scan_init(osb);
 
     status = ocfs2_recovery_init(osb);
     if (status) {
         mlog(ML_ERROR, "Unable to initialize recovery state\n");
         mlog_errno(status);
         goto out;
     }
 
     init_waitqueue_head(&osb->checkpoint_event);
 
     osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 
     osb->slot_num = OCFS2_INVALID_SLOT;
 
     osb->s_xattr_inline_size = le16_to_cpu(
                     di->id2.i_super.s_xattr_inline_size);
 
     osb->local_alloc_state = OCFS2_LA_UNUSED;
     osb->local_alloc_bh = NULL;
     INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
 
     init_waitqueue_head(&osb->osb_mount_event);
 
     ocfs2_resmap_init(osb, &osb->osb_la_resmap);
 
     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 out_recovery_map;
     }
 
     osb->slot_recovery_generations =
         kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
             GFP_KERNEL);
     if (!osb->slot_recovery_generations) {
         status = -ENOMEM;
         mlog_errno(status);
         goto out_vol_label;
     }
 
     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 out_slot_recovery_gen;
     }
 
     osb->osb_rf_lock_tree = RB_ROOT;
 
     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 out_orphan_wipes;
     }
     if (!sb_rdonly(osb->sb) && (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 out_orphan_wipes;
     }
 
     if (ocfs2_clusterinfo_valid(osb)) {
         /*
          * ci_stack and ci_cluster in ocfs2_cluster_info may not be null
          * terminated, so make sure no overflow happens here by using
          * memcpy. Destination strings will always be null terminated
          * because osb is allocated using kzalloc.
          */
         osb->osb_stackflags =
             OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
         memcpy(osb->osb_cluster_stack,
                OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
                OCFS2_STACK_LABEL_LEN);
         if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
             mlog(ML_ERROR,
                  "couldn't mount because of an invalid "
                  "cluster stack label (%s) \n",
                  osb->osb_cluster_stack);
             status = -EINVAL;
             goto out_orphan_wipes;
         }
         memcpy(osb->osb_cluster_name,
             OCFS2_RAW_SB(di)->s_cluster_info.ci_cluster,
             OCFS2_CLUSTER_NAME_LEN);
     } else {
         /* The empty string is identical with classic tools that
          * don't know about s_cluster_info. */
         osb->osb_cluster_stack[0] = '\0';
     }
 
     get_random_bytes(&osb->s_next_generation, sizeof(u32));
 
     /*
      * FIXME
      * This should be done in ocfs2_journal_init(), but any inode
      * writes back operation will cause the filesystem to crash.
      */
     status = ocfs2_journal_alloc(osb);
     if (status < 0)
         goto out_orphan_wipes;
 
     INIT_WORK(&osb->dquot_drop_work, ocfs2_drop_dquot_refs);
     init_llist_head(&osb->dquot_drop_list);
 
     /* 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;
 
     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 out_journal;
     }
 
     total_blocks = ocfs2_clusters_to_blocks(osb->sb,
                         le32_to_cpu(di->i_clusters));
 
     status = generic_check_addressable(osb->sb->s_blocksize_bits,
                        total_blocks);
     if (status) {
         mlog(ML_ERROR, "Volume too large "
              "to mount safely on this system");
         status = -EFBIG;
         goto out_journal;
     }
 
     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 out_journal;
     }
 
     strlcpy(osb->vol_label, di->id2.i_super.s_label,
         OCFS2_MAX_VOL_LABEL_LEN);
     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);
     osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
     trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
                      (unsigned long long)osb->root_blkno,
                      (unsigned long long)osb->system_dir_blkno,
                      osb->s_clustersize_bits);
 
     osb->osb_dlm_debug = ocfs2_new_dlm_debug();
     if (!osb->osb_dlm_debug) {
         status = -ENOMEM;
         mlog_errno(status);
         goto out_uuid_str;
     }
 
     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 out_dlm_out;
     }
 
     /*
      * global bitmap
      */
     inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
                         OCFS2_INVALID_SLOT);
     if (!inode) {
         status = -EINVAL;
         mlog_errno(status);
         goto out_system_inodes;
     }
 
     osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
     osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
     iput(inode);
 
     osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
                  osb->s_feature_incompat) * 8;
 
     status = ocfs2_init_slot_info(osb);
     if (status < 0) {
         mlog_errno(status);
         goto out_system_inodes;
     }
 
     osb->ocfs2_wq = alloc_ordered_workqueue("ocfs2_wq", WQ_MEM_RECLAIM);
     if (!osb->ocfs2_wq) {
         status = -ENOMEM;
         mlog_errno(status);
         goto out_slot_info;
     }
 
     return status;
 
 out_slot_info:
     ocfs2_free_slot_info(osb);
 out_system_inodes:
     ocfs2_release_system_inodes(osb);
 out_dlm_out:
     ocfs2_put_dlm_debug(osb->osb_dlm_debug);
 out_uuid_str:
     kfree(osb->uuid_str);
 out_journal:
     kfree(osb->journal);
 out_orphan_wipes:
     kfree(osb->osb_orphan_wipes);
 out_slot_recovery_gen:
     kfree(osb->slot_recovery_generations);
 out_vol_label:
     kfree(osb->vol_label);
 out_recovery_map:
     kfree(osb->recovery_map);
 out:
     kfree(osb);
     sb->s_fs_info = NULL;
     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,
                    struct ocfs2_blockcheck_stats *stats)
 {
     int status = -EAGAIN;
 
     if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
            strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
         /* We have to do a raw check of the feature here */
         if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
             OCFS2_FEATURE_INCOMPAT_META_ECC) {
             status = ocfs2_block_check_validate(bh->b_data,
                                 bh->b_size,
                                 &di->i_check,
                                 stats);
             if (status)
                 goto out;
         }
         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;
         }
     }
 
 out:
     if (status && status != -EAGAIN)
         mlog_errno(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. */
 
     /* Init our journal object. */
     status = ocfs2_journal_init(osb, &dirty);
     if (status < 0) {
         mlog(ML_ERROR, "Could not initialize journal!\n");
         goto finally;
     }
 
     /* Now that journal has been initialized, check to make sure
        entire volume is addressable. */
     status = ocfs2_journal_addressable(osb);
     if (status)
         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 {
         printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
                "unmounted cleanly, recovering it.\n", osb->dev_str);
     }
 
     local = ocfs2_mount_local(osb);
 
     /* will play back anything left in the journal. */
     status = ocfs2_journal_load(osb->journal, local, dirty);
     if (status < 0) {
         mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
         goto finally;
     }
 
     if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
         jbd2_journal_set_features(osb->journal->j_journal,
                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
     else
         jbd2_journal_clear_features(osb->journal->j_journal,
                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
 
     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. */
     }
 
     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->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);
         goto finally;
     }
 
     status = ocfs2_compute_replay_slots(osb);
     if (status < 0)
         mlog_errno(status);
 
 finally:
     kfree(local_alloc);
 
     if (status)
         mlog_errno(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)
 {
     /* This function assumes that the caller has the main osb resource */
 
     /* ocfs2_initializer_super have already created this workqueue */
     if (osb->ocfs2_wq)
         destroy_workqueue(osb->ocfs2_wq);
 
     ocfs2_free_slot_info(osb);
 
     kfree(osb->osb_orphan_wipes);
     kfree(osb->slot_recovery_generations);
     /* FIXME
      * This belongs in journal shutdown, but because we have to
      * allocate osb->journal at the middle of ocfs2_initialize_super(),
      * we free it here.
      */
     kfree(osb->journal);
     kfree(osb->local_alloc_copy);
     kfree(osb->uuid_str);
     kfree(osb->vol_label);
     ocfs2_put_dlm_debug(osb->osb_dlm_debug);
     memset(osb, 0, sizeof(struct ocfs2_super));
 }
 
 /* Depending on the mount option passed, perform one of the following:
  * Put OCFS2 into a readonly state (default)
  * Return EIO so that only the process errs
  * Fix the error as if fsck.ocfs2 -y
  * panic
  */
 static int ocfs2_handle_error(struct super_block *sb)
 {
     struct ocfs2_super *osb = OCFS2_SB(sb);
     int rv = 0;
 
     ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
     pr_crit("On-disk corruption discovered. "
         "Please run fsck.ocfs2 once the filesystem is unmounted.\n");
 
     if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) {
         panic("OCFS2: (device %s): panic forced after error\n",
               sb->s_id);
     } else if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_CONT) {
         pr_crit("OCFS2: Returning error to the calling process.\n");
         rv = -EIO;
     } else { /* default option */
         rv = -EROFS;
         if (sb_rdonly(sb) && (ocfs2_is_soft_readonly(osb) || ocfs2_is_hard_readonly(osb)))
             return rv;
 
         pr_crit("OCFS2: File system is now read-only.\n");
         sb->s_flags |= SB_RDONLY;
         ocfs2_set_ro_flag(osb, 0);
     }
 
     return rv;
 }
 
 int __ocfs2_error(struct super_block *sb, const char *function,
           const char *fmt, ...)
 {
     struct va_format vaf;
     va_list args;
 
     va_start(args, fmt);
     vaf.fmt = fmt;
     vaf.va = &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: %pV",
            sb->s_id, function, &vaf);
 
     va_end(args);
 
     return 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, ...)
 {
     struct va_format vaf;
     va_list args;
 
     va_start(args, fmt);
 
     vaf.fmt = fmt;
     vaf.va = &args;
 
     printk(KERN_CRIT "OCFS2: abort (device %s): %s: %pV",
            sb->s_id, function, &vaf);
 
     va_end(args);
 
     /* 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. */
     if (!ocfs2_mount_local(OCFS2_SB(sb)))
         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
     ocfs2_handle_error(sb);
 }
 
 /*
  * Void signal blockers, because in-kernel sigprocmask() only fails
  * when SIG_* is wrong.
  */
 void ocfs2_block_signals(sigset_t *oldset)
 {
     int rc;
     sigset_t blocked;
 
     sigfillset(&blocked);
     rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
     BUG_ON(rc);
 }
 
 void ocfs2_unblock_signals(sigset_t *oldset)
 {
     int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
     BUG_ON(rc);
 }
 
 module_init(ocfs2_init);
 module_exit(ocfs2_exit);

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