[mirror_ubuntu-zesty-kernel.git] / fs / btrfs / delayed-inode.h

/*
 * Copyright (C) 2011 Fujitsu.  All rights reserved.
 * Written by Miao Xie <miaox@cn.fujitsu.com>
 *
 * 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 __DELAYED_TREE_OPERATION_H
#define __DELAYED_TREE_OPERATION_H

#include <linux/rbtree.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/atomic.h>

#include "ctree.h"

/* types of the delayed item */
#define BTRFS_DELAYED_INSERTION_ITEM	1
#define BTRFS_DELAYED_DELETION_ITEM	2

struct btrfs_delayed_root {
	spinlock_t lock;
	struct list_head node_list;
	/*
	 * Used for delayed nodes which is waiting to be dealt with by the
	 * worker. If the delayed node is inserted into the work queue, we
	 * drop it from this list.
	 */
	struct list_head prepare_list;
	atomic_t items;		/* for delayed items */
	atomic_t items_seq;	/* for delayed items */
	int nodes;		/* for delayed nodes */
	wait_queue_head_t wait;
};

#define BTRFS_DELAYED_NODE_IN_LIST	0
#define BTRFS_DELAYED_NODE_INODE_DIRTY	1
#define BTRFS_DELAYED_NODE_DEL_IREF	2

struct btrfs_delayed_node {
	u64 inode_id;
	u64 bytes_reserved;
	struct btrfs_root *root;
	/* Used to add the node into the delayed root's node list. */
	struct list_head n_list;
	/*
	 * Used to add the node into the prepare list, the nodes in this list
	 * is waiting to be dealt with by the async worker.
	 */
	struct list_head p_list;
	struct rb_root ins_root;
	struct rb_root del_root;
	struct mutex mutex;
	struct btrfs_inode_item inode_item;
	atomic_t refs;
	u64 index_cnt;
	unsigned long flags;
	int count;
};

struct btrfs_delayed_item {
	struct rb_node rb_node;
	struct btrfs_key key;
	struct list_head tree_list;	/* used for batch insert/delete items */
	struct list_head readdir_list;	/* used for readdir items */
	u64 bytes_reserved;
	struct btrfs_delayed_node *delayed_node;
	atomic_t refs;
	int ins_or_del;
	u32 data_len;
	char data[0];
};

static inline void btrfs_init_delayed_root(
				struct btrfs_delayed_root *delayed_root)
{
	atomic_set(&delayed_root->items, 0);
	atomic_set(&delayed_root->items_seq, 0);
	delayed_root->nodes = 0;
	spin_lock_init(&delayed_root->lock);
	init_waitqueue_head(&delayed_root->wait);
	INIT_LIST_HEAD(&delayed_root->node_list);
	INIT_LIST_HEAD(&delayed_root->prepare_list);
}

int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
				   struct btrfs_fs_info *fs_info,
				   const char *name, int name_len,
				   struct inode *dir,
				   struct btrfs_disk_key *disk_key, u8 type,
				   u64 index);

int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
				   struct btrfs_fs_info *fs_info,
				   struct inode *dir, u64 index);

int btrfs_inode_delayed_dir_index_count(struct inode *inode);

int btrfs_run_delayed_items(struct btrfs_trans_handle *trans,
			    struct btrfs_fs_info *fs_info);
int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans,
			       struct btrfs_fs_info *fs_info, int nr);

void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info);

int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
				     struct inode *inode);
/* Used for evicting the inode. */
void btrfs_remove_delayed_node(struct inode *inode);
void btrfs_kill_delayed_inode_items(struct inode *inode);
int btrfs_commit_inode_delayed_inode(struct inode *inode);


int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root, struct inode *inode);
int btrfs_fill_inode(struct inode *inode, u32 *rdev);
int btrfs_delayed_delete_inode_ref(struct inode *inode);

/* Used for drop dead root */
void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);

/* Used for clean the transaction */
void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info);

/* Used for readdir() */
bool btrfs_readdir_get_delayed_items(struct inode *inode,
				     struct list_head *ins_list,
				     struct list_head *del_list);
void btrfs_readdir_put_delayed_items(struct inode *inode,
				     struct list_head *ins_list,
				     struct list_head *del_list);
int btrfs_should_delete_dir_index(struct list_head *del_list,
				  u64 index);
int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
				    struct list_head *ins_list);

/* for init */
int __init btrfs_delayed_inode_init(void);
void btrfs_delayed_inode_exit(void);

/* for debugging */
void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info);

#endif
Commit	Line	Data
16cdcec7 MX	1	/*
	2	* Copyright (C) 2011 Fujitsu. All rights reserved.
	3	* Written by Miao Xie <miaox@cn.fujitsu.com>
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public
	7	* License v2 as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public
	15	* License along with this program; if not, write to the
	16	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	17	* Boston, MA 021110-1307, USA.
	18	*/
	19
	20	#ifndef __DELAYED_TREE_OPERATION_H
	21	#define __DELAYED_TREE_OPERATION_H
	22
	23	#include <linux/rbtree.h>
	24	#include <linux/spinlock.h>
	25	#include <linux/mutex.h>
	26	#include <linux/list.h>
	27	#include <linux/wait.h>
60063497	28	#include <linux/atomic.h>
16cdcec7 MX	29
	30	#include "ctree.h"
	31
	32	/* types of the delayed item */
	33	#define BTRFS_DELAYED_INSERTION_ITEM 1
	34	#define BTRFS_DELAYED_DELETION_ITEM 2
	35
	36	struct btrfs_delayed_root {
	37	spinlock_t lock;
	38	struct list_head node_list;
	39	/*
	40	* Used for delayed nodes which is waiting to be dealt with by the
	41	* worker. If the delayed node is inserted into the work queue, we
	42	* drop it from this list.
	43	*/
	44	struct list_head prepare_list;
	45	atomic_t items; /* for delayed items */
de3cb945	46	atomic_t items_seq; /* for delayed items */
16cdcec7 MX	47	int nodes; /* for delayed nodes */
	48	wait_queue_head_t wait;
	49	};
	50
7cf35d91 MX	51	#define BTRFS_DELAYED_NODE_IN_LIST 0
7cf35d91 MX	52	#define BTRFS_DELAYED_NODE_INODE_DIRTY 1
67de1176	53	#define BTRFS_DELAYED_NODE_DEL_IREF 2
7cf35d91	54
16cdcec7 MX	55	struct btrfs_delayed_node {
	56	u64 inode_id;
	57	u64 bytes_reserved;
	58	struct btrfs_root *root;
	59	/* Used to add the node into the delayed root's node list. */
	60	struct list_head n_list;
	61	/*
	62	* Used to add the node into the prepare list, the nodes in this list
	63	* is waiting to be dealt with by the async worker.
	64	*/
	65	struct list_head p_list;
	66	struct rb_root ins_root;
	67	struct rb_root del_root;
	68	struct mutex mutex;
	69	struct btrfs_inode_item inode_item;
	70	atomic_t refs;
	71	u64 index_cnt;
7cf35d91	72	unsigned long flags;
16cdcec7 MX	73	int count;
	74	};
	75
	76	struct btrfs_delayed_item {
	77	struct rb_node rb_node;
	78	struct btrfs_key key;
	79	struct list_head tree_list; /* used for batch insert/delete items */
	80	struct list_head readdir_list; /* used for readdir items */
	81	u64 bytes_reserved;
16cdcec7 MX	82	struct btrfs_delayed_node *delayed_node;
	83	atomic_t refs;
	84	int ins_or_del;
	85	u32 data_len;
	86	char data[0];
	87	};
	88
	89	static inline void btrfs_init_delayed_root(
	90	struct btrfs_delayed_root *delayed_root)
	91	{
	92	atomic_set(&delayed_root->items, 0);
de3cb945	93	atomic_set(&delayed_root->items_seq, 0);
16cdcec7 MX	94	delayed_root->nodes = 0;
	95	spin_lock_init(&delayed_root->lock);
	96	init_waitqueue_head(&delayed_root->wait);
	97	INIT_LIST_HEAD(&delayed_root->node_list);
	98	INIT_LIST_HEAD(&delayed_root->prepare_list);
	99	}
	100
	101	int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
2ff7e61e JM	102	struct btrfs_fs_info *fs_info,
	103	const char *name, int name_len,
	104	struct inode *dir,
16cdcec7 MX	105	struct btrfs_disk_key *disk_key, u8 type,
	106	u64 index);
	107
	108	int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
2ff7e61e JM	109	struct btrfs_fs_info *fs_info,
2ff7e61e JM	110	struct inode *dir, u64 index);
16cdcec7 MX	111
	112	int btrfs_inode_delayed_dir_index_count(struct inode *inode);
	113
	114	int btrfs_run_delayed_items(struct btrfs_trans_handle *trans,
2ff7e61e	115	struct btrfs_fs_info *fs_info);
96c3f433	116	int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans,
2ff7e61e	117	struct btrfs_fs_info *fs_info, int nr);
16cdcec7	118
2ff7e61e	119	void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info);
16cdcec7 MX	120
	121	int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
	122	struct inode *inode);
	123	/* Used for evicting the inode. */
	124	void btrfs_remove_delayed_node(struct inode *inode);
	125	void btrfs_kill_delayed_inode_items(struct inode *inode);
0e8c36a9	126	int btrfs_commit_inode_delayed_inode(struct inode *inode);
16cdcec7 MX	127
	128
	129	int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
	130	struct btrfs_root root, struct inode inode);
2f7e33d4	131	int btrfs_fill_inode(struct inode inode, u32 rdev);
67de1176	132	int btrfs_delayed_delete_inode_ref(struct inode *inode);
16cdcec7 MX	133
	134	/* Used for drop dead root */
	135	void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
	136
67cde344	137	/* Used for clean the transaction */
ccdf9b30	138	void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info);
67cde344	139
16cdcec7	140	/* Used for readdir() */
02dbfc99 OS	141	bool btrfs_readdir_get_delayed_items(struct inode *inode,
	142	struct list_head *ins_list,
	143	struct list_head *del_list);
	144	void btrfs_readdir_put_delayed_items(struct inode *inode,
	145	struct list_head *ins_list,
	146	struct list_head *del_list);
16cdcec7 MX	147	int btrfs_should_delete_dir_index(struct list_head *del_list,
16cdcec7 MX	148	u64 index);
9cdda8d3	149	int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
d2fbb2b5	150	struct list_head *ins_list);
16cdcec7 MX	151
	152	/* for init */
	153	int __init btrfs_delayed_inode_init(void);
	154	void btrfs_delayed_inode_exit(void);
e999376f CM	155
e999376f CM	156	/* for debugging */
ccdf9b30	157	void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info);
e999376f	158
16cdcec7	159	#endif