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1/* SPDX-License-Identifier: GPL-2.0+ */2/*3 * Persistent object (dat entry/disk inode) allocator/deallocator4 *5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.6 *7 * Originally written by Koji Sato.8 * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.9 */10 11#ifndef _NILFS_ALLOC_H12#define _NILFS_ALLOC_H13 14#include <linux/types.h>15#include <linux/buffer_head.h>16#include <linux/fs.h>17 18/**19 * nilfs_palloc_entries_per_group - get the number of entries per group20 * @inode: inode of metadata file using this allocator21 *22 * The number of entries per group is defined by the number of bits23 * that a bitmap block can maintain.24 */25static inline unsigned long26nilfs_palloc_entries_per_group(const struct inode *inode)27{28 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);29}30 31int nilfs_palloc_init_blockgroup(struct inode *, unsigned int);32int nilfs_palloc_get_entry_block(struct inode *, __u64, int,33 struct buffer_head **);34void *nilfs_palloc_block_get_entry(const struct inode *, __u64,35 const struct buffer_head *, void *);36 37int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);38 39/**40 * struct nilfs_palloc_req - persistent allocator request and reply41 * @pr_entry_nr: entry number (vblocknr or inode number)42 * @pr_desc_bh: buffer head of the buffer containing block group descriptors43 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap44 * @pr_entry_bh: buffer head of the buffer containing translation entries45 */46struct 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 53int nilfs_palloc_prepare_alloc_entry(struct inode *inode,54 struct nilfs_palloc_req *req, bool wrap);55void nilfs_palloc_commit_alloc_entry(struct inode *,56 struct nilfs_palloc_req *);57void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);58void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);59int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);60void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);61int nilfs_palloc_freev(struct inode *, __u64 *, size_t);62 63#define nilfs_set_bit_atomic ext2_set_bit_atomic64#define nilfs_clear_bit_atomic ext2_clear_bit_atomic65#define nilfs_find_next_zero_bit find_next_zero_bit_le66#define nilfs_find_next_bit find_next_bit_le67 68/**69 * struct nilfs_bh_assoc - block offset and buffer head association70 * @blkoff: block offset71 * @bh: buffer head72 */73struct nilfs_bh_assoc {74 unsigned long blkoff;75 struct buffer_head *bh;76};77 78/**79 * struct nilfs_palloc_cache - persistent object allocator cache80 * @lock: cache protecting lock81 * @prev_desc: blockgroup descriptors cache82 * @prev_bitmap: blockgroup bitmap cache83 * @prev_entry: translation entries cache84 */85struct 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 92void nilfs_palloc_setup_cache(struct inode *inode,93 struct nilfs_palloc_cache *cache);94void nilfs_palloc_clear_cache(struct inode *inode);95void nilfs_palloc_destroy_cache(struct inode *inode);96 97#endif /* _NILFS_ALLOC_H */98