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 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 * 20 * Original code was written by Koji Sato <koji@osrg.net>. 21 * Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>, 22 * Amagai Yoshiji <amagai@osrg.net>. 23 */ 24 25 #ifndef _NILFS_ALLOC_H 26 #define _NILFS_ALLOC_H 27 28 #include <linux/types.h> 29 #include <linux/buffer_head.h> 30 #include <linux/fs.h> 31 32 static inline unsigned long 33 nilfs_palloc_entries_per_group(const struct inode *inode) 34 { 35 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */); 36 } 37 38 int nilfs_palloc_init_blockgroup(struct inode *, unsigned); 39 int nilfs_palloc_get_entry_block(struct inode *, __u64, int, 40 struct buffer_head **); 41 void *nilfs_palloc_block_get_entry(const struct inode *, __u64, 42 const struct buffer_head *, void *); 43 44 /** 45 * nilfs_palloc_req - persistent alloctor request and reply 46 * @pr_entry_nr: entry number (vblocknr or inode number) 47 * @pr_desc_bh: buffer head of the buffer containing block group descriptors 48 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap 49 * @pr_entry_bh: buffer head of the buffer containing translation entries 50 */ 51 struct nilfs_palloc_req { 52 __u64 pr_entry_nr; 53 struct buffer_head *pr_desc_bh; 54 struct buffer_head *pr_bitmap_bh; 55 struct buffer_head *pr_entry_bh; 56 }; 57 58 int nilfs_palloc_prepare_alloc_entry(struct inode *, 59 struct nilfs_palloc_req *); 60 void nilfs_palloc_commit_alloc_entry(struct inode *, 61 struct nilfs_palloc_req *); 62 void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *); 63 void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *); 64 int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *); 65 void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *); 66 int nilfs_palloc_freev(struct inode *, __u64 *, size_t); 67 68 #define nilfs_set_bit_atomic ext2_set_bit_atomic 69 #define nilfs_clear_bit_atomic ext2_clear_bit_atomic 70 #define nilfs_find_next_zero_bit ext2_find_next_zero_bit 71 72 #endif /* _NILFS_ALLOC_H */ 73