/* 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. * * Return: Number of entries per group. */static inline unsigned longnilfs_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 **);size_t nilfs_palloc_entry_offset(const struct inode *inode, __u64 nr,				 const struct buffer_head *bh); int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *); /** * struct 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 *inode,				     struct nilfs_palloc_req *req, bool wrap);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 */