bdb265eae0
This adds structures and operations for the block mapping (bmap for short). NILFS2 uses direct mappings for short files or B-tree based mappings for longer files. Every on-disk data block is held with inodes and managed through this block mapping. The nilfs_bmap structure and a set of functions here provide this capability to the NILFS2 inode. [penberg@cs.helsinki.fi: remove a bunch of bmap wrapper macros] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
244 lines
7.7 KiB
C
244 lines
7.7 KiB
C
/*
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* bmap.h - NILFS block mapping.
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*
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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*/
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#ifndef _NILFS_BMAP_H
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#define _NILFS_BMAP_H
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/nilfs2_fs.h>
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#include "alloc.h"
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#define NILFS_BMAP_INVALID_PTR 0
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#define nilfs_bmap_dkey_to_key(dkey) le64_to_cpu(dkey)
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#define nilfs_bmap_key_to_dkey(key) cpu_to_le64(key)
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#define nilfs_bmap_dptr_to_ptr(dptr) le64_to_cpu(dptr)
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#define nilfs_bmap_ptr_to_dptr(ptr) cpu_to_le64(ptr)
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#define nilfs_bmap_keydiff_abs(diff) ((diff) < 0 ? -(diff) : (diff))
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struct nilfs_bmap;
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/**
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* union nilfs_bmap_ptr_req - request for bmap ptr
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* @bpr_ptr: bmap pointer
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* @bpr_req: request for persistent allocator
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*/
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union nilfs_bmap_ptr_req {
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__u64 bpr_ptr;
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struct nilfs_palloc_req bpr_req;
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};
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/**
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* struct nilfs_bmap_stats - bmap statistics
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* @bs_nblocks: number of blocks created or deleted
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*/
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struct nilfs_bmap_stats {
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unsigned int bs_nblocks;
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};
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/**
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* struct nilfs_bmap_operations - bmap operation table
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*/
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struct nilfs_bmap_operations {
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int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *);
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int (*bop_insert)(struct nilfs_bmap *, __u64, __u64);
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int (*bop_delete)(struct nilfs_bmap *, __u64);
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void (*bop_clear)(struct nilfs_bmap *);
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int (*bop_propagate)(const struct nilfs_bmap *, struct buffer_head *);
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void (*bop_lookup_dirty_buffers)(struct nilfs_bmap *,
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struct list_head *);
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int (*bop_assign)(struct nilfs_bmap *,
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struct buffer_head **,
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sector_t,
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union nilfs_binfo *);
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int (*bop_mark)(struct nilfs_bmap *, __u64, int);
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/* The following functions are internal use only. */
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int (*bop_last_key)(const struct nilfs_bmap *, __u64 *);
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int (*bop_check_insert)(const struct nilfs_bmap *, __u64);
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int (*bop_check_delete)(struct nilfs_bmap *, __u64);
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int (*bop_gather_data)(struct nilfs_bmap *, __u64 *, __u64 *, int);
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};
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/**
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* struct nilfs_bmap_ptr_operations - bmap ptr operation table
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*/
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struct nilfs_bmap_ptr_operations {
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int (*bpop_prepare_alloc_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *);
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void (*bpop_commit_alloc_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *);
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void (*bpop_abort_alloc_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *);
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int (*bpop_prepare_start_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *);
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void (*bpop_commit_start_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *,
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sector_t);
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void (*bpop_abort_start_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *);
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int (*bpop_prepare_end_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *);
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void (*bpop_commit_end_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *);
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void (*bpop_abort_end_ptr)(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *);
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int (*bpop_translate)(const struct nilfs_bmap *, __u64, __u64 *);
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};
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#define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(__le64))
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#define NILFS_BMAP_KEY_BIT (sizeof(unsigned long) * 8 /* CHAR_BIT */)
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#define NILFS_BMAP_NEW_PTR_INIT \
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(1UL << (sizeof(unsigned long) * 8 /* CHAR_BIT */ - 1))
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static inline int nilfs_bmap_is_new_ptr(unsigned long ptr)
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{
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return !!(ptr & NILFS_BMAP_NEW_PTR_INIT);
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}
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/**
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* struct nilfs_bmap - bmap structure
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* @b_u: raw data
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* @b_sem: semaphore
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* @b_inode: owner of bmap
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* @b_ops: bmap operation table
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* @b_pops: bmap ptr operation table
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* @b_low: low watermark of conversion
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* @b_high: high watermark of conversion
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* @b_last_allocated_key: last allocated key for data block
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* @b_last_allocated_ptr: last allocated ptr for data block
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* @b_state: state
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*/
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struct nilfs_bmap {
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union {
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__u8 u_flags;
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__le64 u_data[NILFS_BMAP_SIZE / sizeof(__le64)];
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} b_u;
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struct rw_semaphore b_sem;
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struct inode *b_inode;
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const struct nilfs_bmap_operations *b_ops;
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const struct nilfs_bmap_ptr_operations *b_pops;
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__u64 b_low;
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__u64 b_high;
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__u64 b_last_allocated_key;
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__u64 b_last_allocated_ptr;
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int b_state;
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};
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/* state */
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#define NILFS_BMAP_DIRTY 0x00000001
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int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *);
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int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *);
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void nilfs_bmap_write(struct nilfs_bmap *, struct nilfs_inode *);
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int nilfs_bmap_lookup(struct nilfs_bmap *, unsigned long, unsigned long *);
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int nilfs_bmap_insert(struct nilfs_bmap *, unsigned long, unsigned long);
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int nilfs_bmap_delete(struct nilfs_bmap *, unsigned long);
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int nilfs_bmap_last_key(struct nilfs_bmap *, unsigned long *);
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int nilfs_bmap_truncate(struct nilfs_bmap *, unsigned long);
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void nilfs_bmap_clear(struct nilfs_bmap *);
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int nilfs_bmap_propagate(struct nilfs_bmap *, struct buffer_head *);
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void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *, struct list_head *);
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int nilfs_bmap_assign(struct nilfs_bmap *, struct buffer_head **,
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unsigned long, union nilfs_binfo *);
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int nilfs_bmap_lookup_at_level(struct nilfs_bmap *, __u64, int, __u64 *);
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int nilfs_bmap_mark(struct nilfs_bmap *, __u64, int);
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void nilfs_bmap_init_gc(struct nilfs_bmap *);
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void nilfs_bmap_init_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
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void nilfs_bmap_commit_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
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/*
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* Internal use only
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*/
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int nilfs_bmap_move_v(const struct nilfs_bmap *, __u64, sector_t);
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int nilfs_bmap_mark_dirty(const struct nilfs_bmap *, __u64);
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__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *,
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const struct buffer_head *);
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__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *, __u64);
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__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *);
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int nilfs_bmap_prepare_update(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *,
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union nilfs_bmap_ptr_req *);
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void nilfs_bmap_commit_update(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *,
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union nilfs_bmap_ptr_req *);
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void nilfs_bmap_abort_update(struct nilfs_bmap *,
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union nilfs_bmap_ptr_req *,
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union nilfs_bmap_ptr_req *);
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void nilfs_bmap_add_blocks(const struct nilfs_bmap *, int);
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void nilfs_bmap_sub_blocks(const struct nilfs_bmap *, int);
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int nilfs_bmap_get_block(const struct nilfs_bmap *, __u64,
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struct buffer_head **);
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void nilfs_bmap_put_block(const struct nilfs_bmap *, struct buffer_head *);
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int nilfs_bmap_get_new_block(const struct nilfs_bmap *, __u64,
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struct buffer_head **);
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void nilfs_bmap_delete_block(const struct nilfs_bmap *, struct buffer_head *);
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/* Assume that bmap semaphore is locked. */
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static inline int nilfs_bmap_dirty(const struct nilfs_bmap *bmap)
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{
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return !!(bmap->b_state & NILFS_BMAP_DIRTY);
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}
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/* Assume that bmap semaphore is locked. */
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static inline void nilfs_bmap_set_dirty(struct nilfs_bmap *bmap)
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{
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bmap->b_state |= NILFS_BMAP_DIRTY;
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}
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/* Assume that bmap semaphore is locked. */
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static inline void nilfs_bmap_clear_dirty(struct nilfs_bmap *bmap)
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{
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bmap->b_state &= ~NILFS_BMAP_DIRTY;
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}
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#define NILFS_BMAP_LARGE 0x1
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#define NILFS_BMAP_SMALL_LOW NILFS_DIRECT_KEY_MIN
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#define NILFS_BMAP_SMALL_HIGH NILFS_DIRECT_KEY_MAX
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#define NILFS_BMAP_LARGE_LOW NILFS_BTREE_ROOT_NCHILDREN_MAX
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#define NILFS_BMAP_LARGE_HIGH NILFS_BTREE_KEY_MAX
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#endif /* _NILFS_BMAP_H */
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