[linux.git] / fs / ocfs2 / refcounttree.h

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * refcounttree.h
 *
 * Copyright (C) 2009 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 version 2 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.
 */
#ifndef OCFS2_REFCOUNTTREE_H
#define OCFS2_REFCOUNTTREE_H

struct ocfs2_refcount_tree {
	struct rb_node rf_node;
	u64 rf_blkno;
	u32 rf_generation;
	struct kref rf_getcnt;
	struct rw_semaphore rf_sem;
	struct ocfs2_lock_res rf_lockres;
	int rf_removed;

	/* the following 4 fields are used by caching_info. */
	spinlock_t rf_lock;
	struct ocfs2_caching_info rf_ci;
	struct mutex rf_io_mutex;
	struct super_block *rf_sb;
};

void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
			     struct ocfs2_refcount_tree **tree,
			     struct buffer_head **ref_bh);
void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
				struct ocfs2_refcount_tree *tree,
				int rw);

int ocfs2_decrease_refcount(struct inode *inode,
			    handle_t *handle, u32 cpos, u32 len,
			    struct ocfs2_alloc_context *meta_ac,
			    struct ocfs2_cached_dealloc_ctxt *dealloc,
			    int delete);
int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
					  u64 refcount_loc,
					  u64 phys_blkno,
					  u32 clusters,
					  int *credits,
					  int *ref_blocks);
int ocfs2_refcount_cow(struct inode *inode,
		       struct buffer_head *di_bh,
		       u32 cpos, u32 write_len, u32 max_cpos);

typedef int (ocfs2_post_refcount_func)(struct inode *inode,
				       handle_t *handle,
				       void *para);
/*
 * Some refcount caller need to do more work after we modify the data b-tree
 * during refcount operation(including CoW and add refcount flag), and make the
 * transaction complete. So it must give us this structure so that we can do it
 * within our transaction.
 *
 */
struct ocfs2_post_refcount {
	int credits;			/* credits it need for journal. */
	ocfs2_post_refcount_func *func;	/* real function. */
	void *para;
};

int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
				       struct ocfs2_caching_info *ref_ci,
				       struct buffer_head *ref_root_bh,
				       struct ocfs2_xattr_value_root *xv,
				       int *meta_add, int *credits);
int ocfs2_refcount_cow_xattr(struct inode *inode,
			     struct ocfs2_dinode *di,
			     struct ocfs2_xattr_value_buf *vb,
			     struct ocfs2_refcount_tree *ref_tree,
			     struct buffer_head *ref_root_bh,
			     u32 cpos, u32 write_len,
			     struct ocfs2_post_refcount *post);
int ocfs2_duplicate_clusters_by_page(handle_t *handle,
				     struct inode *inode,
				     u32 cpos, u32 old_cluster,
				     u32 new_cluster, u32 new_len);
int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
				    struct inode *inode,
				    u32 cpos, u32 old_cluster,
				    u32 new_cluster, u32 new_len);
int ocfs2_cow_sync_writeback(struct super_block *sb,
			     struct inode *inode,
			     u32 cpos, u32 num_clusters);
int ocfs2_add_refcount_flag(struct inode *inode,
			    struct ocfs2_extent_tree *data_et,
			    struct ocfs2_caching_info *ref_ci,
			    struct buffer_head *ref_root_bh,
			    u32 cpos, u32 p_cluster, u32 num_clusters,
			    struct ocfs2_cached_dealloc_ctxt *dealloc,
			    struct ocfs2_post_refcount *post);
int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
int ocfs2_try_remove_refcount_tree(struct inode *inode,
				   struct buffer_head *di_bh);
int ocfs2_increase_refcount(handle_t *handle,
			    struct ocfs2_caching_info *ci,
			    struct buffer_head *ref_root_bh,
			    u64 cpos, u32 len,
			    struct ocfs2_alloc_context *meta_ac,
			    struct ocfs2_cached_dealloc_ctxt *dealloc);
int ocfs2_reflink_ioctl(struct inode *inode,
			const char __user *oldname,
			const char __user *newname,
			bool preserve);
#endif /* OCFS2_REFCOUNTTREE_H */
Commit	Line	Data
8dec98ed TM	1	/* -- mode: c; c-basic-offset: 8; --
	2	* vim: noexpandtab sw=8 ts=8 sts=0:
	3	*
	4	* refcounttree.h
	5	*
	6	* Copyright (C) 2009 Oracle. All rights reserved.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public
	10	* License version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*/
	17	#ifndef OCFS2_REFCOUNTTREE_H
	18	#define OCFS2_REFCOUNTTREE_H
	19
	20	struct ocfs2_refcount_tree {
	21	struct rb_node rf_node;
	22	u64 rf_blkno;
	23	u32 rf_generation;
83fd9c7f	24	struct kref rf_getcnt;
8dec98ed TM	25	struct rw_semaphore rf_sem;
8dec98ed TM	26	struct ocfs2_lock_res rf_lockres;
8dec98ed TM	27	int rf_removed;
	28
	29	/* the following 4 fields are used by caching_info. */
8dec98ed	30	spinlock_t rf_lock;
83fd9c7f	31	struct ocfs2_caching_info rf_ci;
8dec98ed TM	32	struct mutex rf_io_mutex;
	33	struct super_block *rf_sb;
	34	};
	35
374a263e TM	36	void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
	37	int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
	38	struct ocfs2_refcount_tree **tree,
	39	struct buffer_head **ref_bh);
	40	void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
	41	struct ocfs2_refcount_tree *tree,
	42	int rw);
1823cb0b TM	43
	44	int ocfs2_decrease_refcount(struct inode *inode,
	45	handle_t *handle, u32 cpos, u32 len,
	46	struct ocfs2_alloc_context *meta_ac,
6ae23c55 TM	47	struct ocfs2_cached_dealloc_ctxt *dealloc,
6ae23c55 TM	48	int delete);
bcbbb24a	49	int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
78f94673	50	u64 refcount_loc,
bcbbb24a TM	51	u64 phys_blkno,
	52	u32 clusters,
	53	int *credits,
78f94673	54	int *ref_blocks);
15502712	55	int ocfs2_refcount_cow(struct inode *inode,
c7dd3392	56	struct buffer_head *di_bh,
37f8a2bf	57	u32 cpos, u32 write_len, u32 max_cpos);
492a8a33 TM	58
	59	typedef int (ocfs2_post_refcount_func)(struct inode *inode,
	60	handle_t *handle,
	61	void *para);
	62	/*
	63	* Some refcount caller need to do more work after we modify the data b-tree
	64	* during refcount operation(including CoW and add refcount flag), and make the
	65	* transaction complete. So it must give us this structure so that we can do it
	66	* within our transaction.
	67	*
	68	*/
	69	struct ocfs2_post_refcount {
	70	int credits; /* credits it need for journal. */
	71	ocfs2_post_refcount_func func; / real function. */
	72	void *para;
	73	};
	74
	75	int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
	76	struct ocfs2_caching_info *ref_ci,
	77	struct buffer_head *ref_root_bh,
	78	struct ocfs2_xattr_value_root *xv,
	79	int meta_add, int credits);
	80	int ocfs2_refcount_cow_xattr(struct inode *inode,
	81	struct ocfs2_dinode *di,
	82	struct ocfs2_xattr_value_buf *vb,
	83	struct ocfs2_refcount_tree *ref_tree,
	84	struct buffer_head *ref_root_bh,
	85	u32 cpos, u32 write_len,
	86	struct ocfs2_post_refcount *post);
3e19a25e	87	int ocfs2_duplicate_clusters_by_page(handle_t *handle,
c7dd3392	88	struct inode *inode,
3e19a25e TY	89	u32 cpos, u32 old_cluster,
	90	u32 new_cluster, u32 new_len);
	91	int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
c7dd3392	92	struct inode *inode,
3e19a25e TY	93	u32 cpos, u32 old_cluster,
	94	u32 new_cluster, u32 new_len);
	95	int ocfs2_cow_sync_writeback(struct super_block *sb,
	96	struct inode *inode,
	97	u32 cpos, u32 num_clusters);
0129241e TM	98	int ocfs2_add_refcount_flag(struct inode *inode,
	99	struct ocfs2_extent_tree *data_et,
	100	struct ocfs2_caching_info *ref_ci,
	101	struct buffer_head *ref_root_bh,
	102	u32 cpos, u32 p_cluster, u32 num_clusters,
	103	struct ocfs2_cached_dealloc_ctxt *dealloc,
	104	struct ocfs2_post_refcount *post);
8b2c0dba TM	105	int ocfs2_remove_refcount_tree(struct inode inode, struct buffer_head di_bh);
	106	int ocfs2_try_remove_refcount_tree(struct inode *inode,
	107	struct buffer_head *di_bh);
2999d12f TM	108	int ocfs2_increase_refcount(handle_t *handle,
	109	struct ocfs2_caching_info *ci,
	110	struct buffer_head *ref_root_bh,
	111	u64 cpos, u32 len,
	112	struct ocfs2_alloc_context *meta_ac,
	113	struct ocfs2_cached_dealloc_ctxt *dealloc);
bd50873d TM	114	int ocfs2_reflink_ioctl(struct inode *inode,
	115	const char __user *oldname,
	116	const char __user *newname,
	117	bool preserve);
8dec98ed	118	#endif /* OCFS2_REFCOUNTTREE_H */