[people/ms/linux.git] / fs / nilfs2 / alloc.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Persistent object (dat entry/disk inode) allocator/deallocator
 *
 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
 *
 * Originally written by Koji Sato.
 * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
 */

#ifndef _NILFS_ALLOC_H
#define _NILFS_ALLOC_H

#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>

/**
 * nilfs_palloc_entries_per_group - get the number of entries per group
 * @inode: inode of metadata file using this allocator
 *
 * The number of entries per group is defined by the number of bits
 * that a bitmap block can maintain.
 */
static inline unsigned long
nilfs_palloc_entries_per_group(const struct inode *inode)
{
	return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
}

int nilfs_palloc_init_blockgroup(struct inode *, unsigned int);
int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
				 struct buffer_head **);
void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
				   const struct buffer_head *, void *);

int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);

/**
 * nilfs_palloc_req - persistent allocator request and reply
 * @pr_entry_nr: entry number (vblocknr or inode number)
 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
 * @pr_entry_bh: buffer head of the buffer containing translation entries
 */
struct nilfs_palloc_req {
	__u64 pr_entry_nr;
	struct buffer_head *pr_desc_bh;
	struct buffer_head *pr_bitmap_bh;
	struct buffer_head *pr_entry_bh;
};

int nilfs_palloc_prepare_alloc_entry(struct inode *,
				     struct nilfs_palloc_req *);
void nilfs_palloc_commit_alloc_entry(struct inode *,
				     struct nilfs_palloc_req *);
void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
int nilfs_palloc_freev(struct inode *, __u64 *, size_t);

#define nilfs_set_bit_atomic		ext2_set_bit_atomic
#define nilfs_clear_bit_atomic		ext2_clear_bit_atomic
#define nilfs_find_next_zero_bit	find_next_zero_bit_le
#define nilfs_find_next_bit		find_next_bit_le

/**
 * struct nilfs_bh_assoc - block offset and buffer head association
 * @blkoff: block offset
 * @bh: buffer head
 */
struct nilfs_bh_assoc {
	unsigned long blkoff;
	struct buffer_head *bh;
};

/**
 * struct nilfs_palloc_cache - persistent object allocator cache
 * @lock: cache protecting lock
 * @prev_desc: blockgroup descriptors cache
 * @prev_bitmap: blockgroup bitmap cache
 * @prev_entry: translation entries cache
 */
struct nilfs_palloc_cache {
	spinlock_t lock;
	struct nilfs_bh_assoc prev_desc;
	struct nilfs_bh_assoc prev_bitmap;
	struct nilfs_bh_assoc prev_entry;
};

void nilfs_palloc_setup_cache(struct inode *inode,
			      struct nilfs_palloc_cache *cache);
void nilfs_palloc_clear_cache(struct inode *inode);
void nilfs_palloc_destroy_cache(struct inode *inode);

#endif	/* _NILFS_ALLOC_H */
Commit	Line	Data
ae98043f	1	/* SPDX-License-Identifier: GPL-2.0+ */
5442680f	2	/*
94ee1d91	3	* Persistent object (dat entry/disk inode) allocator/deallocator
5442680f RK	4	*
	5	* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
	6	*
4b420ab4 RK	7	* Originally written by Koji Sato.
4b420ab4 RK	8	* Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
5442680f RK	9	*/
	10
	11	#ifndef _NILFS_ALLOC_H
	12	#define _NILFS_ALLOC_H
	13
	14	#include <linux/types.h>
	15	#include <linux/buffer_head.h>
	16	#include <linux/fs.h>
	17
db55d922 RK	18	/**
	19	* nilfs_palloc_entries_per_group - get the number of entries per group
	20	* @inode: inode of metadata file using this allocator
	21	*
	22	* The number of entries per group is defined by the number of bits
	23	* that a bitmap block can maintain.
	24	*/
5442680f RK	25	static inline unsigned long
	26	nilfs_palloc_entries_per_group(const struct inode *inode)
	27	{
	28	return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
	29	}
	30
0c6c44cb	31	int nilfs_palloc_init_blockgroup(struct inode *, unsigned int);
5442680f RK	32	int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
	33	struct buffer_head **);
	34	void nilfs_palloc_block_get_entry(const struct inode , __u64,
	35	const struct buffer_head , void );
	36
c7ef972c VD	37	int nilfs_palloc_count_max_entries(struct inode , u64, u64 );
c7ef972c VD	38
5442680f	39	/**
7a65004b	40	* nilfs_palloc_req - persistent allocator request and reply
5442680f RK	41	* @pr_entry_nr: entry number (vblocknr or inode number)
	42	* @pr_desc_bh: buffer head of the buffer containing block group descriptors
	43	* @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
	44	* @pr_entry_bh: buffer head of the buffer containing translation entries
	45	*/
	46	struct nilfs_palloc_req {
	47	__u64 pr_entry_nr;
	48	struct buffer_head *pr_desc_bh;
	49	struct buffer_head *pr_bitmap_bh;
	50	struct buffer_head *pr_entry_bh;
	51	};
	52
	53	int nilfs_palloc_prepare_alloc_entry(struct inode *,
	54	struct nilfs_palloc_req *);
	55	void nilfs_palloc_commit_alloc_entry(struct inode *,
	56	struct nilfs_palloc_req *);
	57	void nilfs_palloc_abort_alloc_entry(struct inode , struct nilfs_palloc_req );
	58	void nilfs_palloc_commit_free_entry(struct inode , struct nilfs_palloc_req );
	59	int nilfs_palloc_prepare_free_entry(struct inode , struct nilfs_palloc_req );
	60	void nilfs_palloc_abort_free_entry(struct inode , struct nilfs_palloc_req );
	61	int nilfs_palloc_freev(struct inode , __u64 , size_t);
	62
	63	#define nilfs_set_bit_atomic ext2_set_bit_atomic
	64	#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
a49ebbab	65	#define nilfs_find_next_zero_bit find_next_zero_bit_le
d0c14a9e	66	#define nilfs_find_next_bit find_next_bit_le
5442680f	67
f5974c8f VD	68	/**
	69	* struct nilfs_bh_assoc - block offset and buffer head association
	70	* @blkoff: block offset
	71	* @bh: buffer head
db38d5ad	72	*/
db38d5ad RK	73	struct nilfs_bh_assoc {
	74	unsigned long blkoff;
	75	struct buffer_head *bh;
	76	};
	77
f5974c8f VD	78	/**
	79	* struct nilfs_palloc_cache - persistent object allocator cache
	80	* @lock: cache protecting lock
	81	* @prev_desc: blockgroup descriptors cache
	82	* @prev_bitmap: blockgroup bitmap cache
	83	* @prev_entry: translation entries cache
	84	*/
db38d5ad RK	85	struct nilfs_palloc_cache {
	86	spinlock_t lock;
	87	struct nilfs_bh_assoc prev_desc;
	88	struct nilfs_bh_assoc prev_bitmap;
	89	struct nilfs_bh_assoc prev_entry;
	90	};
	91
	92	void nilfs_palloc_setup_cache(struct inode *inode,
	93	struct nilfs_palloc_cache *cache);
	94	void nilfs_palloc_clear_cache(struct inode *inode);
	95	void nilfs_palloc_destroy_cache(struct inode *inode);
	96
5442680f	97	#endif /* _NILFS_ALLOC_H */