[linux-2.6-block.git] / fs / btrfs / transaction.h

/*
 * Copyright (C) 2007 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 v2 as published by the Free Software Foundation.
 *
 * 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 __BTRFS_TRANSACTION__
#define __BTRFS_TRANSACTION__

#include <linux/refcount.h>
#include "btrfs_inode.h"
#include "delayed-ref.h"
#include "ctree.h"

enum btrfs_trans_state {
	TRANS_STATE_RUNNING		= 0,
	TRANS_STATE_BLOCKED		= 1,
	TRANS_STATE_COMMIT_START	= 2,
	TRANS_STATE_COMMIT_DOING	= 3,
	TRANS_STATE_UNBLOCKED		= 4,
	TRANS_STATE_COMPLETED		= 5,
	TRANS_STATE_MAX			= 6,
};

#define BTRFS_TRANS_HAVE_FREE_BGS	0
#define BTRFS_TRANS_DIRTY_BG_RUN	1
#define BTRFS_TRANS_CACHE_ENOSPC	2

struct btrfs_transaction {
	u64 transid;
	/*
	 * total external writers(USERSPACE/START/ATTACH) in this
	 * transaction, it must be zero before the transaction is
	 * being committed
	 */
	atomic_t num_extwriters;
	/*
	 * total writers in this transaction, it must be zero before the
	 * transaction can end
	 */
	atomic_t num_writers;
	refcount_t use_count;
	atomic_t pending_ordered;

	unsigned long flags;

	/* Be protected by fs_info->trans_lock when we want to change it. */
	enum btrfs_trans_state state;
	struct list_head list;
	struct extent_io_tree dirty_pages;
	unsigned long start_time;
	wait_queue_head_t writer_wait;
	wait_queue_head_t commit_wait;
	wait_queue_head_t pending_wait;
	struct list_head pending_snapshots;
	struct list_head pending_chunks;
	struct list_head switch_commits;
	struct list_head dirty_bgs;
	struct list_head io_bgs;
	struct list_head dropped_roots;
	u64 num_dirty_bgs;

	/*
	 * we need to make sure block group deletion doesn't race with
	 * free space cache writeout.  This mutex keeps them from stomping
	 * on each other
	 */
	struct mutex cache_write_mutex;
	spinlock_t dirty_bgs_lock;
	/* Protected by spin lock fs_info->unused_bgs_lock. */
	struct list_head deleted_bgs;
	spinlock_t dropped_roots_lock;
	struct btrfs_delayed_ref_root delayed_refs;
	int aborted;
	struct btrfs_fs_info *fs_info;
};

#define __TRANS_FREEZABLE	(1U << 0)

#define __TRANS_USERSPACE	(1U << 8)
#define __TRANS_START		(1U << 9)
#define __TRANS_ATTACH		(1U << 10)
#define __TRANS_JOIN		(1U << 11)
#define __TRANS_JOIN_NOLOCK	(1U << 12)
#define __TRANS_DUMMY		(1U << 13)

#define TRANS_USERSPACE		(__TRANS_USERSPACE | __TRANS_FREEZABLE)
#define TRANS_START		(__TRANS_START | __TRANS_FREEZABLE)
#define TRANS_ATTACH		(__TRANS_ATTACH)
#define TRANS_JOIN		(__TRANS_JOIN | __TRANS_FREEZABLE)
#define TRANS_JOIN_NOLOCK	(__TRANS_JOIN_NOLOCK)

#define TRANS_EXTWRITERS	(__TRANS_USERSPACE | __TRANS_START |	\
				 __TRANS_ATTACH)

#define BTRFS_SEND_TRANS_STUB	((void *)1)

struct btrfs_trans_handle {
	u64 transid;
	u64 bytes_reserved;
	u64 chunk_bytes_reserved;
	unsigned long use_count;
	unsigned long blocks_reserved;
	unsigned long delayed_ref_updates;
	struct btrfs_transaction *transaction;
	struct btrfs_block_rsv *block_rsv;
	struct btrfs_block_rsv *orig_rsv;
	short aborted;
	short adding_csums;
	bool allocating_chunk;
	bool can_flush_pending_bgs;
	bool reloc_reserved;
	bool sync;
	bool dirty;
	unsigned int type;
	struct btrfs_root *root;
	struct btrfs_fs_info *fs_info;
	struct list_head new_bgs;
};

struct btrfs_pending_snapshot {
	struct dentry *dentry;
	struct inode *dir;
	struct btrfs_root *root;
	struct btrfs_root_item *root_item;
	struct btrfs_root *snap;
	struct btrfs_qgroup_inherit *inherit;
	struct btrfs_path *path;
	/* block reservation for the operation */
	struct btrfs_block_rsv block_rsv;
	u64 qgroup_reserved;
	/* extra metadata reservation for relocation */
	int error;
	bool readonly;
	struct list_head list;
};

static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
					      struct inode *inode)
{
	spin_lock(&BTRFS_I(inode)->lock);
	BTRFS_I(inode)->last_trans = trans->transaction->transid;
	BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
	BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
	spin_unlock(&BTRFS_I(inode)->lock);
}

/*
 * Make qgroup codes to skip given qgroupid, means the old/new_roots for
 * qgroup won't contain the qgroupid in it.
 */
static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
					 u64 qgroupid)
{
	struct btrfs_delayed_ref_root *delayed_refs;

	delayed_refs = &trans->transaction->delayed_refs;
	WARN_ON(delayed_refs->qgroup_to_skip);
	delayed_refs->qgroup_to_skip = qgroupid;
}

static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
{
	struct btrfs_delayed_ref_root *delayed_refs;

	delayed_refs = &trans->transaction->delayed_refs;
	WARN_ON(!delayed_refs->qgroup_to_skip);
	delayed_refs->qgroup_to_skip = 0;
}

int btrfs_end_transaction(struct btrfs_trans_handle *trans);
struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
						   unsigned int num_items);
struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
					struct btrfs_root *root,
					unsigned int num_items,
					int min_factor);
struct btrfs_trans_handle *btrfs_start_transaction_lflush(
					struct btrfs_root *root,
					unsigned int num_items);
struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
					struct btrfs_root *root);
struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid);

void btrfs_add_dead_root(struct btrfs_root *root);
int btrfs_defrag_root(struct btrfs_root *root);
int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
int btrfs_commit_transaction(struct btrfs_trans_handle *trans);
int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
				   int wait_for_unblock);
int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans);
int btrfs_should_end_transaction(struct btrfs_trans_handle *trans);
void btrfs_throttle(struct btrfs_fs_info *fs_info);
int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
				struct btrfs_root *root);
int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info,
				struct extent_io_tree *dirty_pages, int mark);
int btrfs_wait_extents(struct btrfs_fs_info *fs_info,
		       struct extent_io_tree *dirty_pages);
int btrfs_wait_tree_log_extents(struct btrfs_root *root, int mark);
int btrfs_transaction_blocked(struct btrfs_fs_info *info);
int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
void btrfs_put_transaction(struct btrfs_transaction *transaction);
void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root);
#endif
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2007 Oracle. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public
	6	* License v2 as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public
	14	* License along with this program; if not, write to the
	15	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	16	* Boston, MA 021110-1307, USA.
	17	*/
	18
	19	#ifndef __BTRFS_TRANSACTION__
	20	#define __BTRFS_TRANSACTION__
	21
	22	#include <linux/refcount.h>
	23	#include "btrfs_inode.h"
	24	#include "delayed-ref.h"
	25	#include "ctree.h"
	26
	27	enum btrfs_trans_state {
	28	TRANS_STATE_RUNNING = 0,
	29	TRANS_STATE_BLOCKED = 1,
	30	TRANS_STATE_COMMIT_START = 2,
	31	TRANS_STATE_COMMIT_DOING = 3,
	32	TRANS_STATE_UNBLOCKED = 4,
	33	TRANS_STATE_COMPLETED = 5,
	34	TRANS_STATE_MAX = 6,
	35	};
	36
	37	#define BTRFS_TRANS_HAVE_FREE_BGS 0
	38	#define BTRFS_TRANS_DIRTY_BG_RUN 1
	39	#define BTRFS_TRANS_CACHE_ENOSPC 2
	40
	41	struct btrfs_transaction {
	42	u64 transid;
	43	/*
	44	* total external writers(USERSPACE/START/ATTACH) in this
	45	* transaction, it must be zero before the transaction is
	46	* being committed
	47	*/
	48	atomic_t num_extwriters;
	49	/*
	50	* total writers in this transaction, it must be zero before the
	51	* transaction can end
	52	*/
	53	atomic_t num_writers;
	54	refcount_t use_count;
	55	atomic_t pending_ordered;
	56
	57	unsigned long flags;
	58
	59	/* Be protected by fs_info->trans_lock when we want to change it. */
	60	enum btrfs_trans_state state;
	61	struct list_head list;
	62	struct extent_io_tree dirty_pages;
	63	unsigned long start_time;
	64	wait_queue_head_t writer_wait;
	65	wait_queue_head_t commit_wait;
	66	wait_queue_head_t pending_wait;
	67	struct list_head pending_snapshots;
	68	struct list_head pending_chunks;
	69	struct list_head switch_commits;
	70	struct list_head dirty_bgs;
	71	struct list_head io_bgs;
	72	struct list_head dropped_roots;
	73	u64 num_dirty_bgs;
	74
	75	/*
	76	* we need to make sure block group deletion doesn't race with
	77	* free space cache writeout. This mutex keeps them from stomping
	78	* on each other
	79	*/
	80	struct mutex cache_write_mutex;
	81	spinlock_t dirty_bgs_lock;
	82	/* Protected by spin lock fs_info->unused_bgs_lock. */
	83	struct list_head deleted_bgs;
	84	spinlock_t dropped_roots_lock;
	85	struct btrfs_delayed_ref_root delayed_refs;
	86	int aborted;
	87	struct btrfs_fs_info *fs_info;
	88	};
	89
	90	#define __TRANS_FREEZABLE (1U << 0)
	91
	92	#define __TRANS_USERSPACE (1U << 8)
	93	#define __TRANS_START (1U << 9)
	94	#define __TRANS_ATTACH (1U << 10)
	95	#define __TRANS_JOIN (1U << 11)
	96	#define __TRANS_JOIN_NOLOCK (1U << 12)
	97	#define __TRANS_DUMMY (1U << 13)
	98
	99	#define TRANS_USERSPACE (__TRANS_USERSPACE \| __TRANS_FREEZABLE)
	100	#define TRANS_START (__TRANS_START \| __TRANS_FREEZABLE)
	101	#define TRANS_ATTACH (__TRANS_ATTACH)
	102	#define TRANS_JOIN (__TRANS_JOIN \| __TRANS_FREEZABLE)
	103	#define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
	104
	105	#define TRANS_EXTWRITERS (__TRANS_USERSPACE \| __TRANS_START \| \
	106	__TRANS_ATTACH)
	107
	108	#define BTRFS_SEND_TRANS_STUB ((void *)1)
	109
	110	struct btrfs_trans_handle {
	111	u64 transid;
	112	u64 bytes_reserved;
	113	u64 chunk_bytes_reserved;
	114	unsigned long use_count;
	115	unsigned long blocks_reserved;
	116	unsigned long delayed_ref_updates;
	117	struct btrfs_transaction *transaction;
	118	struct btrfs_block_rsv *block_rsv;
	119	struct btrfs_block_rsv *orig_rsv;
	120	short aborted;
	121	short adding_csums;
	122	bool allocating_chunk;
	123	bool can_flush_pending_bgs;
	124	bool reloc_reserved;
	125	bool sync;
	126	bool dirty;
	127	unsigned int type;
	128	struct btrfs_root *root;
	129	struct btrfs_fs_info *fs_info;
	130	struct list_head new_bgs;
	131	};
	132
	133	struct btrfs_pending_snapshot {
	134	struct dentry *dentry;
	135	struct inode *dir;
	136	struct btrfs_root *root;
	137	struct btrfs_root_item *root_item;
	138	struct btrfs_root *snap;
	139	struct btrfs_qgroup_inherit *inherit;
	140	struct btrfs_path *path;
	141	/* block reservation for the operation */
	142	struct btrfs_block_rsv block_rsv;
	143	u64 qgroup_reserved;
	144	/* extra metadata reservation for relocation */
	145	int error;
	146	bool readonly;
	147	struct list_head list;
	148	};
	149
	150	static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
	151	struct inode *inode)
	152	{
	153	spin_lock(&BTRFS_I(inode)->lock);
	154	BTRFS_I(inode)->last_trans = trans->transaction->transid;
	155	BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
	156	BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
	157	spin_unlock(&BTRFS_I(inode)->lock);
	158	}
	159
	160	/*
	161	* Make qgroup codes to skip given qgroupid, means the old/new_roots for
	162	* qgroup won't contain the qgroupid in it.
	163	*/
	164	static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
	165	u64 qgroupid)
	166	{
	167	struct btrfs_delayed_ref_root *delayed_refs;
	168
	169	delayed_refs = &trans->transaction->delayed_refs;
	170	WARN_ON(delayed_refs->qgroup_to_skip);
	171	delayed_refs->qgroup_to_skip = qgroupid;
	172	}
	173
	174	static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
	175	{
	176	struct btrfs_delayed_ref_root *delayed_refs;
	177
	178	delayed_refs = &trans->transaction->delayed_refs;
	179	WARN_ON(!delayed_refs->qgroup_to_skip);
	180	delayed_refs->qgroup_to_skip = 0;
	181	}
	182
	183	int btrfs_end_transaction(struct btrfs_trans_handle *trans);
	184	struct btrfs_trans_handle btrfs_start_transaction(struct btrfs_root root,
	185	unsigned int num_items);
	186	struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
	187	struct btrfs_root *root,
	188	unsigned int num_items,
	189	int min_factor);
	190	struct btrfs_trans_handle *btrfs_start_transaction_lflush(
	191	struct btrfs_root *root,
	192	unsigned int num_items);
	193	struct btrfs_trans_handle btrfs_join_transaction(struct btrfs_root root);
	194	struct btrfs_trans_handle btrfs_join_transaction_nolock(struct btrfs_root root);
	195	struct btrfs_trans_handle btrfs_attach_transaction(struct btrfs_root root);
	196	struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
	197	struct btrfs_root *root);
	198	struct btrfs_trans_handle btrfs_start_ioctl_transaction(struct btrfs_root root);
	199	int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid);
	200
	201	void btrfs_add_dead_root(struct btrfs_root *root);
	202	int btrfs_defrag_root(struct btrfs_root *root);
	203	int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
	204	int btrfs_commit_transaction(struct btrfs_trans_handle *trans);
	205	int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
	206	int wait_for_unblock);
	207	int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans);
	208	int btrfs_should_end_transaction(struct btrfs_trans_handle *trans);
	209	void btrfs_throttle(struct btrfs_fs_info *fs_info);
	210	int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
	211	struct btrfs_root *root);
	212	int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info,
	213	struct extent_io_tree *dirty_pages, int mark);
	214	int btrfs_wait_extents(struct btrfs_fs_info *fs_info,
	215	struct extent_io_tree *dirty_pages);
	216	int btrfs_wait_tree_log_extents(struct btrfs_root *root, int mark);
	217	int btrfs_transaction_blocked(struct btrfs_fs_info *info);
	218	int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
	219	void btrfs_put_transaction(struct btrfs_transaction *transaction);
	220	void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
	221	void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
	222	struct btrfs_root *root);
	223	#endif