path: root/fs/ocfs2/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/llist.h>
#include <linux/rbtree.h>
#include <linux/workqueue.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/lockdep.h>
#include <linux/jbd2.h>

/* For union ocfs2_dlm_lksb */
#include "stackglue.h"

#include "ocfs2_fs.h"
#include "ocfs2_lockid.h"
#include "ocfs2_ioctl.h"

/* For struct ocfs2_blockcheck_stats */
#include "blockcheck.h"

#include "reservations.h"

/* Caching of metadata buffers */

/* 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_CACHE_INFO_MAX_ARRAY 2

/* Flags for ocfs2_caching_info */

enum ocfs2_caching_info_flags {
	/* Indicates that the metadata cache is using the inline array */
	OCFS2_CACHE_FL_INLINE	= 1<<1,
};

struct ocfs2_caching_operations;
struct ocfs2_caching_info {
	/*
	 * The parent structure provides the locks, but because the
	 * parent structure can differ, it provides locking operations
	 * to struct ocfs2_caching_info.
	 */
	const struct ocfs2_caching_operations *ci_ops;

	/* next two are protected by trans_inc_lock */
	/* which transaction were we created on? Zero if none. */
	unsigned long		ci_created_trans;
	/* last transaction we were a part of. */
	unsigned long		ci_last_trans;

	/* Cache structures */
	unsigned int		ci_flags;
	unsigned int		ci_num_cached;
	union {
	sector_t	ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
		struct rb_root	ci_tree;
	} ci_cache;
};
/*
 * Need this prototype here instead of in uptodate.h because journal.h
 * uses it.
 */
struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);

/* 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) /* we have 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 */
#define OCFS2_LOCK_PENDING       (0x00000400) /* This lockres is pending a
						 call to dlm_lock.  Only
						 exists with BUSY set. */
#define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
						     * from downconverting
						     * before the upconvert
						     * has completed */

#define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster
						   * lock has already
						   * returned, do not block
						   * dc thread from
						   * downconverting */

struct ocfs2_lock_res_ops;

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

#ifdef CONFIG_OCFS2_FS_STATS
struct ocfs2_lock_stats {
	u64		ls_total;	/* Total wait in NSEC */
	u32		ls_gets;	/* Num acquires */
	u32		ls_fail;	/* Num failed acquires */

	/* Storing max wait in usecs saves 24 bytes per inode */
	u32		ls_max;		/* Max wait in USEC */
};
#endif

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


	struct list_head         l_blocked_list;
	struct list_head         l_mask_waiters;
	struct list_head	 l_holders;

	unsigned long		 l_flags;
	char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
	unsigned int             l_ro_holders;
	unsigned int             l_ex_holders;
	signed char		 l_level;
	signed char		 l_requested;
	signed char		 l_blocking;

	/* Data packed - type enum ocfs2_lock_type */
	unsigned char            l_type;

	/* used from AST/BAST funcs. */
	/* Data packed - enum type ocfs2_ast_action */
	unsigned char            l_action;
	/* Data packed - enum type ocfs2_unlock_action */
	unsigned char            l_unlock_action;
	unsigned int             l_pending_gen;

	spinlock_t               l_lock;

	struct ocfs2_dlm_lksb    l_lksb;

	wait_queue_head_t        l_event;

	struct list_head         l_debug_list;

#ifdef CONFIG_OCFS2_FS_STATS
	struct ocfs2_lock_stats  l_lock_prmode;		/* PR mode stats */
	u32                      l_lock_refresh;	/* Disk refreshes */
	struct ocfs2_lock_stats  l_lock_exmode;		/* EX mode stats */
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	struct lockdep_map	 l_lockdep_map;
#endif
};

enum ocfs2_orphan_reco_type {
	ORPHAN_NO_NEED_TRUNCATE = 0,
	ORPHAN_NEED_TRUNCATE,
};

enum ocfs2_orphan_scan_state {
	ORPHAN_SCAN_ACTIVE,
	ORPHAN_SCAN_INACTIVE
};

struct ocfs2_orphan_scan {
	struct mutex 		os_lock;
	struct ocfs2_super 	*os_osb;
	struct ocfs2_lock_res 	os_lockres;     /* lock to synchronize scans */
	struct delayed_work 	os_orphan_scan_work;
	time64_t		os_scantime;  /* time this node ran the scan */
	u32			os_count;      /* tracks node specific scans */
	u32  			os_seqno;       /* tracks cluster wide scans */
	atomic_t		os_state;              /* ACTIVE or INACTIVE */
};

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_MOUNTED_QUOTAS,
	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,	/* Local alloc will never be used for
				 * this mountpoint. */
	OCFS2_LA_ENABLED,