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TOMOYO Linux Cross Reference
Linux/fs/nilfs2/alloc.h

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  1 /*
  2  * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator
  3  *
  4  * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * Originally written by Koji Sato.
 17  * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
 18  */
 19 
 20 #ifndef _NILFS_ALLOC_H
 21 #define _NILFS_ALLOC_H
 22 
 23 #include <linux/types.h>
 24 #include <linux/buffer_head.h>
 25 #include <linux/fs.h>
 26 
 27 /**
 28  * nilfs_palloc_entries_per_group - get the number of entries per group
 29  * @inode: inode of metadata file using this allocator
 30  *
 31  * The number of entries per group is defined by the number of bits
 32  * that a bitmap block can maintain.
 33  */
 34 static inline unsigned long
 35 nilfs_palloc_entries_per_group(const struct inode *inode)
 36 {
 37         return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
 38 }
 39 
 40 int nilfs_palloc_init_blockgroup(struct inode *, unsigned int);
 41 int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
 42                                  struct buffer_head **);
 43 void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
 44                                    const struct buffer_head *, void *);
 45 
 46 int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);
 47 
 48 /**
 49  * nilfs_palloc_req - persistent allocator request and reply
 50  * @pr_entry_nr: entry number (vblocknr or inode number)
 51  * @pr_desc_bh: buffer head of the buffer containing block group descriptors
 52  * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
 53  * @pr_entry_bh: buffer head of the buffer containing translation entries
 54  */
 55 struct nilfs_palloc_req {
 56         __u64 pr_entry_nr;
 57         struct buffer_head *pr_desc_bh;
 58         struct buffer_head *pr_bitmap_bh;
 59         struct buffer_head *pr_entry_bh;
 60 };
 61 
 62 int nilfs_palloc_prepare_alloc_entry(struct inode *,
 63                                      struct nilfs_palloc_req *);
 64 void nilfs_palloc_commit_alloc_entry(struct inode *,
 65                                      struct nilfs_palloc_req *);
 66 void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
 67 void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
 68 int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
 69 void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
 70 int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
 71 
 72 #define nilfs_set_bit_atomic            ext2_set_bit_atomic
 73 #define nilfs_clear_bit_atomic          ext2_clear_bit_atomic
 74 #define nilfs_find_next_zero_bit        find_next_zero_bit_le
 75 #define nilfs_find_next_bit             find_next_bit_le
 76 
 77 /**
 78  * struct nilfs_bh_assoc - block offset and buffer head association
 79  * @blkoff: block offset
 80  * @bh: buffer head
 81  */
 82 struct nilfs_bh_assoc {
 83         unsigned long blkoff;
 84         struct buffer_head *bh;
 85 };
 86 
 87 /**
 88  * struct nilfs_palloc_cache - persistent object allocator cache
 89  * @lock: cache protecting lock
 90  * @prev_desc: blockgroup descriptors cache
 91  * @prev_bitmap: blockgroup bitmap cache
 92  * @prev_entry: translation entries cache
 93  */
 94 struct nilfs_palloc_cache {
 95         spinlock_t lock;
 96         struct nilfs_bh_assoc prev_desc;
 97         struct nilfs_bh_assoc prev_bitmap;
 98         struct nilfs_bh_assoc prev_entry;
 99 };
100 
101 void nilfs_palloc_setup_cache(struct inode *inode,
102                               struct nilfs_palloc_cache *cache);
103 void nilfs_palloc_clear_cache(struct inode *inode);
104 void nilfs_palloc_destroy_cache(struct inode *inode);
105 
106 #endif  /* _NILFS_ALLOC_H */
107 

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