fs/ocfs2/ocfs2.h - kernel/msm-4.19 - Gitiles

 /* -*- mode: c; c-basic-offset: 8; -*-
  * vim: noexpandtab sw=8 ts=8 sts=0:
  *
  * ocfs2.h
  *
  * Defines macros and structures used in OCFS2
  *
  * 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.
  */

 #ifndef OCFS2_H
 #define OCFS2_H

 #include <linux/spinlock.h>
 #include <linux/sched.h>
 #include <linux/wait.h>
 #include <linux/list.h>
 #include <linux/rbtree.h>
 #include <linux/workqueue.h>
 #include <linux/kref.h>
 #include <linux/mutex.h>
 #include <linux/jbd.h>

 #include "cluster/nodemanager.h"
 #include "cluster/heartbeat.h"
 #include "cluster/tcp.h"

 #include "dlm/dlmapi.h"

 #include "ocfs2_fs.h"
 #include "endian.h"
 #include "ocfs2_lockid.h"

 /* Most user visible OCFS2 inodes will have very few pieces of
  * metadata, but larger files (including bitmaps, etc) must be taken
  * into account when designing an access scheme. We allow a small
  * amount of inlined blocks to be stored on an array and grow the
  * structure into a rb tree when necessary. */
 #define OCFS2_INODE_MAX_CACHE_ARRAY 2

 struct ocfs2_caching_info {
 	unsigned int		ci_num_cached;
 	union {
 		sector_t	ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
 		struct rb_root	ci_tree;
 	} ci_cache;
 };

 /* this limits us to 256 nodes
  * if we need more, we can do a kmalloc for the map */
 #define OCFS2_NODE_MAP_MAX_NODES    256
 struct ocfs2_node_map {
 	u16 num_nodes;
 	unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
 };

 enum ocfs2_ast_action {
 	OCFS2_AST_INVALID = 0,
 	OCFS2_AST_ATTACH,
 	OCFS2_AST_CONVERT,
 	OCFS2_AST_DOWNCONVERT,
 };

 /* actions for an unlockast function to take. */
 enum ocfs2_unlock_action {
 	OCFS2_UNLOCK_INVALID = 0,
 	OCFS2_UNLOCK_CANCEL_CONVERT,
 	OCFS2_UNLOCK_DROP_LOCK,
 };

 /* ocfs2_lock_res->l_flags flags. */
 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* have we initialized
 					       * the lvb */
 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
 					       * dlm_lock */
 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
 					       * downconvert*/
 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
 #define OCFS2_LOCK_REFRESHING    (0x00000020)
 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
 					       * for shutdown paths */
 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
 					       * when to skip queueing
 					       * a lock because it's
 					       * about to be
 					       * dropped. */
 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */

 struct ocfs2_lock_res_ops;

 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);

 struct ocfs2_lock_res {
 	void                    *l_priv;
 	struct ocfs2_lock_res_ops *l_ops;
 	spinlock_t               l_lock;

 	struct list_head         l_blocked_list;
 	struct list_head         l_mask_waiters;

 	enum ocfs2_lock_type     l_type;
 	unsigned long		 l_flags;
 	char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
 	int                      l_level;
 	unsigned int             l_ro_holders;
 	unsigned int             l_ex_holders;
 	struct dlm_lockstatus    l_lksb;

 	/* used from AST/BAST funcs. */
 	enum ocfs2_ast_action    l_action;
 	enum ocfs2_unlock_action l_unlock_action;
 	int                      l_requested;
 	int                      l_blocking;

 	wait_queue_head_t        l_event;

 	struct list_head         l_debug_list;
 };

 struct ocfs2_dlm_debug {
 	struct kref d_refcnt;
 	struct dentry *d_locking_state;
 	struct list_head d_lockres_tracking;
 };

 enum ocfs2_vol_state
 {
 	VOLUME_INIT = 0,
 	VOLUME_MOUNTED,
 	VOLUME_DISMOUNTED,
 	VOLUME_DISABLED
 };

 struct ocfs2_alloc_stats
 {
 	atomic_t moves;
 	atomic_t local_data;
 	atomic_t bitmap_data;
 	atomic_t bg_allocs;
 	atomic_t bg_extends;
 };

 enum ocfs2_local_alloc_state
 {
 	OCFS2_LA_UNUSED = 0,
 	OCFS2_LA_ENABLED,
 	OCFS2_LA_DISABLED
 };

 enum ocfs2_mount_options
 {
 	OCFS2_MOUNT_HB_LOCAL   = 1 << 0, /* Heartbeat started in local mode */
 	OCFS2_MOUNT_BARRIER = 1 << 1,	/* Use block barriers */
 	OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
 	OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
 	OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
 	OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
 };

 #define OCFS2_OSB_SOFT_RO	0x0001
 #define OCFS2_OSB_HARD_RO	0x0002
 #define OCFS2_OSB_ERROR_FS	0x0004
 #define OCFS2_DEFAULT_ATIME_QUANTUM	60

 struct ocfs2_journal;
 struct ocfs2_super
 {
 	struct task_struct *commit_task;
 	struct super_block *sb;
 	struct inode *root_inode;
 	struct inode *sys_root_inode;
 	struct inode *system_inodes[NUM_SYSTEM_INODES];

 	struct ocfs2_slot_info *slot_info;

 	spinlock_t node_map_lock;
 	struct ocfs2_node_map recovery_map;

 	u64 root_blkno;
 	u64 system_dir_blkno;
 	u64 bitmap_blkno;
 	u32 bitmap_cpg;
 	u8 *uuid;
 	char *uuid_str;
 	u8 *vol_label;
 	u64 first_cluster_group_blkno;
 	u32 fs_generation;

 	u32 s_feature_compat;
 	u32 s_feature_incompat;
 	u32 s_feature_ro_compat;

 	/* Protects s_next_generaion, osb_flags. Could protect more on
 	 * osb as it's very short lived. */
 	spinlock_t osb_lock;
 	u32 s_next_generation;
 	unsigned long osb_flags;

 	unsigned long s_mount_opt;
 	unsigned int s_atime_quantum;

 	u16 max_slots;
 	s16 node_num;
 	s16 slot_num;
 	s16 preferred_slot;
 	int s_sectsize_bits;
 	int s_clustersize;
 	int s_clustersize_bits;

 	atomic_t vol_state;
 	struct mutex recovery_lock;
 	struct task_struct *recovery_thread_task;
 	int disable_recovery;
 	wait_queue_head_t checkpoint_event;
 	atomic_t needs_checkpoint;
 	struct ocfs2_journal *journal;
 	unsigned long osb_commit_interval;

 	int local_alloc_size;
 	enum ocfs2_local_alloc_state local_alloc_state;
 	struct buffer_head *local_alloc_bh;
 	u64 la_last_gd;

 	/* Next two fields are for local node slot recovery during
 	 * mount. */
 	int dirty;
 	struct ocfs2_dinode *local_alloc_copy;

 	struct ocfs2_alloc_stats alloc_stats;
 	char dev_str[20];		/* "major,minor" of the device */

 	struct dlm_ctxt *dlm;
 	struct ocfs2_lock_res osb_super_lockres;
 	struct ocfs2_lock_res osb_rename_lockres;
 	struct dlm_eviction_cb osb_eviction_cb;
 	struct ocfs2_dlm_debug *osb_dlm_debug;

 	struct dentry *osb_debug_root;

 	wait_queue_head_t recovery_event;

 	spinlock_t dc_task_lock;
 	struct task_struct *dc_task;
 	wait_queue_head_t dc_event;
 	unsigned long dc_wake_sequence;
 	unsigned long dc_work_sequence;

 	/*
 	 * Any thread can add locks to the list, but the downconvert
 	 * thread is the only one allowed to remove locks. Any change
 	 * to this rule requires updating
 	 * ocfs2_downconvert_thread_do_work().
 	 */
 	struct list_head blocked_lock_list;
 	unsigned long blocked_lock_count;

 	wait_queue_head_t		osb_mount_event;

 	/* Truncate log info */
 	struct inode			*osb_tl_inode;
 	struct buffer_head		*osb_tl_bh;
 	struct delayed_work		osb_truncate_log_wq;

 	struct ocfs2_node_map		osb_recovering_orphan_dirs;
 	unsigned int			*osb_orphan_wipes;
 	wait_queue_head_t		osb_wipe_event;
 };

 #define OCFS2_SB(sb)	    ((struct ocfs2_super *)(sb)->s_fs_info)

 static inline int ocfs2_should_order_data(struct inode *inode)
 {
 	if (!S_ISREG(inode->i_mode))
 		return 0;
 	if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
 		return 0;
 	return 1;
 }

 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
 {
 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
 		return 1;
 	return 0;
 }

 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
 {
 	/*
 	 * Support for sparse files is a pre-requisite
 	 */
 	if (!ocfs2_sparse_alloc(osb))
 		return 0;

 	if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
 		return 1;
 	return 0;
 }

 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
 {
 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
 		return 1;
 	return 0;
 }

 /* set / clear functions because cluster events can make these happen
  * in parallel so we want the transitions to be atomic. this also
  * means that any future flags osb_flags must be protected by spinlock
  * too! */
 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
 				      unsigned long flag)
 {
 	spin_lock(&osb->osb_lock);
 	osb->osb_flags |= flag;
 	spin_unlock(&osb->osb_lock);
 }

 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
 				     int hard)
 {
 	spin_lock(&osb->osb_lock);
 	osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
 	if (hard)
 		osb->osb_flags |= OCFS2_OSB_HARD_RO;
 	else
 		osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 	spin_unlock(&osb->osb_lock);
 }

 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
 {
 	int ret;

 	spin_lock(&osb->osb_lock);
 	ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
 	spin_unlock(&osb->osb_lock);

 	return ret;
 }

 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
 {
 	int ret;

 	spin_lock(&osb->osb_lock);
 	ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
 	spin_unlock(&osb->osb_lock);

 	return ret;
 }

 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
 {
 	return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
 }

 #define OCFS2_IS_VALID_DINODE(ptr)					\
 	(!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))

 #define OCFS2_RO_ON_INVALID_DINODE(__sb, __di)	do {			\
 	typeof(__di) ____di = (__di);					\
 	ocfs2_error((__sb), 						\
 		"Dinode # %llu has bad signature %.*s",			\
 		(unsigned long long)le64_to_cpu((____di)->i_blkno), 7, 	\
 		(____di)->i_signature);					\
 } while (0)

 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)				\
 	(!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))

 #define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb)	do {		\
 	typeof(__eb) ____eb = (__eb);					\
 	ocfs2_error((__sb), 						\
 		"Extent Block # %llu has bad signature %.*s",		\
 		(unsigned long long)le64_to_cpu((____eb)->h_blkno), 7,	\
 		(____eb)->h_signature);					\
 } while (0)

 #define OCFS2_IS_VALID_GROUP_DESC(ptr)					\
 	(!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))

 #define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd)	do {		\
 	typeof(__gd) ____gd = (__gd);					\
 		ocfs2_error((__sb),					\
 		"Group Descriptor # %llu has bad signature %.*s",	\
 		(unsigned long long)le64_to_cpu((____gd)->bg_blkno), 7, \
 		(____gd)->bg_signature);				\
 } while (0)

 static inline unsigned long ino_from_blkno(struct super_block *sb,
 					   u64 blkno)
 {
 	return (unsigned long)(blkno & (u64)ULONG_MAX);
 }

 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
 					   u32 clusters)
 {
 	int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
 		sb->s_blocksize_bits;

 	return (u64)clusters << c_to_b_bits;
 }

 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
 					   u64 blocks)
 {
 	int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
 		sb->s_blocksize_bits;

 	return (u32)(blocks >> b_to_c_bits);
 }

 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
 						    u64 bytes)
 {
 	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 	unsigned int clusters;

 	bytes += OCFS2_SB(sb)->s_clustersize - 1;
 	/* OCFS2 just cannot have enough clusters to overflow this */
 	clusters = (unsigned int)(bytes >> cl_bits);

 	return clusters;
 }

 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
 					 u64 bytes)
 {
 	bytes += sb->s_blocksize - 1;
 	return bytes >> sb->s_blocksize_bits;
 }

 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
 					  u32 clusters)
 {
 	return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
 }

 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
 						u64 bytes)
 {
 	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 	unsigned int clusters;

 	clusters = ocfs2_clusters_for_bytes(sb, bytes);
 	return (u64)clusters << cl_bits;
 }

 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
 					      u64 bytes)
 {
 	u64 blocks;

         blocks = ocfs2_blocks_for_bytes(sb, bytes);
 	return blocks << sb->s_blocksize_bits;
 }

 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
 {
 	return (unsigned long)((bytes + 511) >> 9);
 }

 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
 							unsigned long pg_index)
 {
 	u32 clusters = pg_index;
 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;

 	if (unlikely(PAGE_CACHE_SHIFT > cbits))
 		clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
 	else if (PAGE_CACHE_SHIFT < cbits)
 		clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);

 	return clusters;
 }

 /*
  * Find the 1st page index which covers the given clusters.
  */
 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
 							u32 clusters)
 {
 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
         pgoff_t index = clusters;

 	if (PAGE_CACHE_SHIFT > cbits) {
 		index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
 	} else if (PAGE_CACHE_SHIFT < cbits) {
 		index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
 	}

 	return index;
 }

 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
 {
 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 	unsigned int pages_per_cluster = 1;

 	if (PAGE_CACHE_SHIFT < cbits)
 		pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);

 	return pages_per_cluster;
 }

 #define ocfs2_set_bit ext2_set_bit
 #define ocfs2_clear_bit ext2_clear_bit
 #define ocfs2_test_bit ext2_test_bit
 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
 #endif  /* OCFS2_H */
	/* -- mode: c; c-basic-offset: 8; --
	* vim: noexpandtab sw=8 ts=8 sts=0:
	*
	* ocfs2.h
	*
	* Defines macros and structures used in OCFS2
	*
	* 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.
	*/

	#ifndef OCFS2_H
	#define OCFS2_H

	#include <linux/spinlock.h>
	#include <linux/sched.h>
	#include <linux/wait.h>
	#include <linux/list.h>
	#include <linux/rbtree.h>
	#include <linux/workqueue.h>
	#include <linux/kref.h>
	#include <linux/mutex.h>
	#include <linux/jbd.h>

	#include "cluster/nodemanager.h"
	#include "cluster/heartbeat.h"
	#include "cluster/tcp.h"

	#include "dlm/dlmapi.h"

	#include "ocfs2_fs.h"
	#include "endian.h"
	#include "ocfs2_lockid.h"

	/* Most user visible OCFS2 inodes will have very few pieces of
	* metadata, but larger files (including bitmaps, etc) must be taken
	* into account when designing an access scheme. We allow a small
	* amount of inlined blocks to be stored on an array and grow the
	* structure into a rb tree when necessary. */
	#define OCFS2_INODE_MAX_CACHE_ARRAY 2

	struct ocfs2_caching_info {
	unsigned int ci_num_cached;
	union {
	sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
	struct rb_root ci_tree;
	} ci_cache;
	};

	/* this limits us to 256 nodes
	* if we need more, we can do a kmalloc for the map */
	#define OCFS2_NODE_MAP_MAX_NODES 256
	struct ocfs2_node_map {
	u16 num_nodes;
	unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
	};

	enum ocfs2_ast_action {
	OCFS2_AST_INVALID = 0,
	OCFS2_AST_ATTACH,
	OCFS2_AST_CONVERT,
	OCFS2_AST_DOWNCONVERT,
	};

	/* actions for an unlockast function to take. */
	enum ocfs2_unlock_action {
	OCFS2_UNLOCK_INVALID = 0,
	OCFS2_UNLOCK_CANCEL_CONVERT,
	OCFS2_UNLOCK_DROP_LOCK,
	};

	/* ocfs2_lock_res->l_flags flags. */
	#define OCFS2_LOCK_ATTACHED (0x00000001) /* have we initialized
	* the lvb */
	#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
	* dlm_lock */
	#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
	* downconvert*/
	#define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
	#define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
	#define OCFS2_LOCK_REFRESHING (0x00000020)
	#define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
	* for shutdown paths */
	#define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
	* when to skip queueing
	* a lock because it's
	* about to be
	* dropped. */
	#define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
	#define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */

	struct ocfs2_lock_res_ops;

	typedef void (*ocfs2_lock_callback)(int status, unsigned long data);

	struct ocfs2_lock_res {
	void *l_priv;
	struct ocfs2_lock_res_ops *l_ops;
	spinlock_t l_lock;

	struct list_head l_blocked_list;
	struct list_head l_mask_waiters;

	enum ocfs2_lock_type l_type;
	unsigned long l_flags;
	char l_name[OCFS2_LOCK_ID_MAX_LEN];
	int l_level;
	unsigned int l_ro_holders;
	unsigned int l_ex_holders;
	struct dlm_lockstatus l_lksb;

	/* used from AST/BAST funcs. */
	enum ocfs2_ast_action l_action;
	enum ocfs2_unlock_action l_unlock_action;
	int l_requested;
	int l_blocking;

	wait_queue_head_t l_event;

	struct list_head l_debug_list;
	};

	struct ocfs2_dlm_debug {
	struct kref d_refcnt;
	struct dentry *d_locking_state;
	struct list_head d_lockres_tracking;
	};

	enum ocfs2_vol_state
	{
	VOLUME_INIT = 0,
	VOLUME_MOUNTED,
	VOLUME_DISMOUNTED,
	VOLUME_DISABLED
	};

	struct ocfs2_alloc_stats
	{
	atomic_t moves;
	atomic_t local_data;
	atomic_t bitmap_data;
	atomic_t bg_allocs;
	atomic_t bg_extends;
	};

	enum ocfs2_local_alloc_state
	{
	OCFS2_LA_UNUSED = 0,
	OCFS2_LA_ENABLED,
	OCFS2_LA_DISABLED
	};

	enum ocfs2_mount_options
	{
	OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */
	OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
	OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
	OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
	OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
	OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
	};

	#define OCFS2_OSB_SOFT_RO 0x0001
	#define OCFS2_OSB_HARD_RO 0x0002
	#define OCFS2_OSB_ERROR_FS 0x0004
	#define OCFS2_DEFAULT_ATIME_QUANTUM 60

	struct ocfs2_journal;
	struct ocfs2_super
	{
	struct task_struct *commit_task;
	struct super_block *sb;
	struct inode *root_inode;
	struct inode *sys_root_inode;
	struct inode *system_inodes[NUM_SYSTEM_INODES];

	struct ocfs2_slot_info *slot_info;

	spinlock_t node_map_lock;
	struct ocfs2_node_map recovery_map;

	u64 root_blkno;
	u64 system_dir_blkno;
	u64 bitmap_blkno;
	u32 bitmap_cpg;
	u8 *uuid;
	char *uuid_str;
	u8 *vol_label;
	u64 first_cluster_group_blkno;
	u32 fs_generation;

	u32 s_feature_compat;
	u32 s_feature_incompat;
	u32 s_feature_ro_compat;

	/* Protects s_next_generaion, osb_flags. Could protect more on
	* osb as it's very short lived. */
	spinlock_t osb_lock;
	u32 s_next_generation;
	unsigned long osb_flags;

	unsigned long s_mount_opt;
	unsigned int s_atime_quantum;

	u16 max_slots;
	s16 node_num;
	s16 slot_num;
	s16 preferred_slot;
	int s_sectsize_bits;
	int s_clustersize;
	int s_clustersize_bits;

	atomic_t vol_state;
	struct mutex recovery_lock;
	struct task_struct *recovery_thread_task;
	int disable_recovery;
	wait_queue_head_t checkpoint_event;
	atomic_t needs_checkpoint;
	struct ocfs2_journal *journal;
	unsigned long osb_commit_interval;

	int local_alloc_size;
	enum ocfs2_local_alloc_state local_alloc_state;
	struct buffer_head *local_alloc_bh;
	u64 la_last_gd;

	/* Next two fields are for local node slot recovery during
	* mount. */
	int dirty;
	struct ocfs2_dinode *local_alloc_copy;

	struct ocfs2_alloc_stats alloc_stats;
	char dev_str[20]; /* "major,minor" of the device */

	struct dlm_ctxt *dlm;
	struct ocfs2_lock_res osb_super_lockres;
	struct ocfs2_lock_res osb_rename_lockres;
	struct dlm_eviction_cb osb_eviction_cb;
	struct ocfs2_dlm_debug *osb_dlm_debug;

	struct dentry *osb_debug_root;

	wait_queue_head_t recovery_event;

	spinlock_t dc_task_lock;
	struct task_struct *dc_task;
	wait_queue_head_t dc_event;
	unsigned long dc_wake_sequence;
	unsigned long dc_work_sequence;

	/*
	* Any thread can add locks to the list, but the downconvert
	* thread is the only one allowed to remove locks. Any change
	* to this rule requires updating
	* ocfs2_downconvert_thread_do_work().
	*/
	struct list_head blocked_lock_list;
	unsigned long blocked_lock_count;

	wait_queue_head_t osb_mount_event;

	/* Truncate log info */
	struct inode *osb_tl_inode;
	struct buffer_head *osb_tl_bh;
	struct delayed_work osb_truncate_log_wq;

	struct ocfs2_node_map osb_recovering_orphan_dirs;
	unsigned int *osb_orphan_wipes;
	wait_queue_head_t osb_wipe_event;
	};

	#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)

	static inline int ocfs2_should_order_data(struct inode *inode)
	{
	if (!S_ISREG(inode->i_mode))
	return 0;
	if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
	return 0;
	return 1;
	}

	static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
	{
	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
	return 1;
	return 0;
	}

	static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
	{
	/*
	* Support for sparse files is a pre-requisite
	*/
	if (!ocfs2_sparse_alloc(osb))
	return 0;

	if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
	return 1;
	return 0;
	}

	static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
	{
	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
	return 1;
	return 0;
	}

	/* set / clear functions because cluster events can make these happen
	* in parallel so we want the transitions to be atomic. this also
	* means that any future flags osb_flags must be protected by spinlock
	* too! */
	static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
	unsigned long flag)
	{
	spin_lock(&osb->osb_lock);
	osb->osb_flags \|= flag;
	spin_unlock(&osb->osb_lock);
	}

	static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
	int hard)
	{
	spin_lock(&osb->osb_lock);
	osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO\|OCFS2_OSB_HARD_RO);
	if (hard)
	osb->osb_flags \|= OCFS2_OSB_HARD_RO;
	else
	osb->osb_flags \|= OCFS2_OSB_SOFT_RO;
	spin_unlock(&osb->osb_lock);
	}

	static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
	{
	int ret;

	spin_lock(&osb->osb_lock);
	ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
	spin_unlock(&osb->osb_lock);

	return ret;
	}

	static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
	{
	int ret;

	spin_lock(&osb->osb_lock);
	ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
	spin_unlock(&osb->osb_lock);

	return ret;
	}

	static inline int ocfs2_mount_local(struct ocfs2_super *osb)
	{
	return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
	}

	#define OCFS2_IS_VALID_DINODE(ptr) \
	(!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))

	#define OCFS2_RO_ON_INVALID_DINODE(__sb, __di) do { \
	typeof(__di) ____di = (__di); \
	ocfs2_error((__sb), \
	"Dinode # %llu has bad signature %.*s", \
	(unsigned long long)le64_to_cpu((____di)->i_blkno), 7, \
	(____di)->i_signature); \
	} while (0)

	#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
	(!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))

	#define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb) do { \
	typeof(__eb) ____eb = (__eb); \
	ocfs2_error((__sb), \
	"Extent Block # %llu has bad signature %.*s", \
	(unsigned long long)le64_to_cpu((____eb)->h_blkno), 7, \
	(____eb)->h_signature); \
	} while (0)

	#define OCFS2_IS_VALID_GROUP_DESC(ptr) \
	(!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))

	#define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd) do { \
	typeof(__gd) ____gd = (__gd); \
	ocfs2_error((__sb), \
	"Group Descriptor # %llu has bad signature %.*s", \
	(unsigned long long)le64_to_cpu((____gd)->bg_blkno), 7, \
	(____gd)->bg_signature); \
	} while (0)

	static inline unsigned long ino_from_blkno(struct super_block *sb,
	u64 blkno)
	{
	return (unsigned long)(blkno & (u64)ULONG_MAX);
	}

	static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
	u32 clusters)
	{
	int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
	sb->s_blocksize_bits;

	return (u64)clusters << c_to_b_bits;
	}

	static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
	u64 blocks)
	{
	int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
	sb->s_blocksize_bits;

	return (u32)(blocks >> b_to_c_bits);
	}

	static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
	u64 bytes)
	{
	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
	unsigned int clusters;

	bytes += OCFS2_SB(sb)->s_clustersize - 1;
	/* OCFS2 just cannot have enough clusters to overflow this */
	clusters = (unsigned int)(bytes >> cl_bits);

	return clusters;
	}

	static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
	u64 bytes)
	{
	bytes += sb->s_blocksize - 1;
	return bytes >> sb->s_blocksize_bits;
	}

	static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
	u32 clusters)
	{
	return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
	}

	static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
	u64 bytes)
	{
	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
	unsigned int clusters;

	clusters = ocfs2_clusters_for_bytes(sb, bytes);
	return (u64)clusters << cl_bits;
	}

	static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
	u64 bytes)
	{
	u64 blocks;

	blocks = ocfs2_blocks_for_bytes(sb, bytes);
	return blocks << sb->s_blocksize_bits;
	}

	static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
	{
	return (unsigned long)((bytes + 511) >> 9);
	}

	static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
	unsigned long pg_index)
	{
	u32 clusters = pg_index;
	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;

	if (unlikely(PAGE_CACHE_SHIFT > cbits))
	clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
	else if (PAGE_CACHE_SHIFT < cbits)
	clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);

	return clusters;
	}

	/*
	* Find the 1st page index which covers the given clusters.
	*/
	static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
	u32 clusters)
	{
	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
	pgoff_t index = clusters;

	if (PAGE_CACHE_SHIFT > cbits) {
	index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
	} else if (PAGE_CACHE_SHIFT < cbits) {
	index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
	}

	return index;
	}

	static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
	{
	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
	unsigned int pages_per_cluster = 1;

	if (PAGE_CACHE_SHIFT < cbits)
	pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);

	return pages_per_cluster;
	}

	#define ocfs2_set_bit ext2_set_bit
	#define ocfs2_clear_bit ext2_clear_bit
	#define ocfs2_test_bit ext2_test_bit
	#define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
	#endif /* OCFS2_H */