277 lines
8.2 KiB
C
277 lines
8.2 KiB
C
/*
|
|
* bmap.h - NILFS block mapping.
|
|
*
|
|
* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Written by Koji Sato <koji@osrg.net>.
|
|
*/
|
|
|
|
#ifndef _NILFS_BMAP_H
|
|
#define _NILFS_BMAP_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/nilfs2_fs.h>
|
|
#include "alloc.h"
|
|
#include "dat.h"
|
|
|
|
#define NILFS_BMAP_INVALID_PTR 0
|
|
|
|
#define nilfs_bmap_keydiff_abs(diff) ((diff) < 0 ? -(diff) : (diff))
|
|
|
|
|
|
struct nilfs_bmap;
|
|
|
|
/**
|
|
* union nilfs_bmap_ptr_req - request for bmap ptr
|
|
* @bpr_ptr: bmap pointer
|
|
* @bpr_req: request for persistent allocator
|
|
*/
|
|
union nilfs_bmap_ptr_req {
|
|
__u64 bpr_ptr;
|
|
struct nilfs_palloc_req bpr_req;
|
|
};
|
|
|
|
/**
|
|
* struct nilfs_bmap_stats - bmap statistics
|
|
* @bs_nblocks: number of blocks created or deleted
|
|
*/
|
|
struct nilfs_bmap_stats {
|
|
unsigned int bs_nblocks;
|
|
};
|
|
|
|
/**
|
|
* struct nilfs_bmap_operations - bmap operation table
|
|
*/
|
|
struct nilfs_bmap_operations {
|
|
int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *);
|
|
int (*bop_lookup_contig)(const struct nilfs_bmap *, __u64, __u64 *,
|
|
unsigned);
|
|
int (*bop_insert)(struct nilfs_bmap *, __u64, __u64);
|
|
int (*bop_delete)(struct nilfs_bmap *, __u64);
|
|
void (*bop_clear)(struct nilfs_bmap *);
|
|
|
|
int (*bop_propagate)(struct nilfs_bmap *, struct buffer_head *);
|
|
void (*bop_lookup_dirty_buffers)(struct nilfs_bmap *,
|
|
struct list_head *);
|
|
|
|
int (*bop_assign)(struct nilfs_bmap *,
|
|
struct buffer_head **,
|
|
sector_t,
|
|
union nilfs_binfo *);
|
|
int (*bop_mark)(struct nilfs_bmap *, __u64, int);
|
|
|
|
/* The following functions are internal use only. */
|
|
int (*bop_last_key)(const struct nilfs_bmap *, __u64 *);
|
|
int (*bop_check_insert)(const struct nilfs_bmap *, __u64);
|
|
int (*bop_check_delete)(struct nilfs_bmap *, __u64);
|
|
int (*bop_gather_data)(struct nilfs_bmap *, __u64 *, __u64 *, int);
|
|
};
|
|
|
|
|
|
#define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(__le64))
|
|
#define NILFS_BMAP_KEY_BIT (sizeof(unsigned long) * 8 /* CHAR_BIT */)
|
|
#define NILFS_BMAP_NEW_PTR_INIT \
|
|
(1UL << (sizeof(unsigned long) * 8 /* CHAR_BIT */ - 1))
|
|
|
|
static inline int nilfs_bmap_is_new_ptr(unsigned long ptr)
|
|
{
|
|
return !!(ptr & NILFS_BMAP_NEW_PTR_INIT);
|
|
}
|
|
|
|
|
|
/**
|
|
* struct nilfs_bmap - bmap structure
|
|
* @b_u: raw data
|
|
* @b_sem: semaphore
|
|
* @b_inode: owner of bmap
|
|
* @b_ops: bmap operation table
|
|
* @b_last_allocated_key: last allocated key for data block
|
|
* @b_last_allocated_ptr: last allocated ptr for data block
|
|
* @b_ptr_type: pointer type
|
|
* @b_state: state
|
|
* @b_nchildren_per_block: maximum number of child nodes for non-root nodes
|
|
*/
|
|
struct nilfs_bmap {
|
|
union {
|
|
__u8 u_flags;
|
|
__le64 u_data[NILFS_BMAP_SIZE / sizeof(__le64)];
|
|
} b_u;
|
|
struct rw_semaphore b_sem;
|
|
struct inode *b_inode;
|
|
const struct nilfs_bmap_operations *b_ops;
|
|
__u64 b_last_allocated_key;
|
|
__u64 b_last_allocated_ptr;
|
|
int b_ptr_type;
|
|
int b_state;
|
|
__u16 b_nchildren_per_block;
|
|
};
|
|
|
|
/* pointer type */
|
|
#define NILFS_BMAP_PTR_P 0 /* physical block number (i.e. LBN) */
|
|
#define NILFS_BMAP_PTR_VS 1 /* virtual block number (single
|
|
version) */
|
|
#define NILFS_BMAP_PTR_VM 2 /* virtual block number (has multiple
|
|
versions) */
|
|
#define NILFS_BMAP_PTR_U (-1) /* never perform pointer operations */
|
|
|
|
#define NILFS_BMAP_USE_VBN(bmap) ((bmap)->b_ptr_type > 0)
|
|
|
|
/* state */
|
|
#define NILFS_BMAP_DIRTY 0x00000001
|
|
|
|
/**
|
|
* struct nilfs_bmap_store - shadow copy of bmap state
|
|
* @data: cached raw block mapping of on-disk inode
|
|
* @last_allocated_key: cached value of last allocated key for data block
|
|
* @last_allocated_ptr: cached value of last allocated ptr for data block
|
|
* @state: cached value of state field of bmap structure
|
|
*/
|
|
struct nilfs_bmap_store {
|
|
__le64 data[NILFS_BMAP_SIZE / sizeof(__le64)];
|
|
__u64 last_allocated_key;
|
|
__u64 last_allocated_ptr;
|
|
int state;
|
|
};
|
|
|
|
int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *);
|
|
int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *);
|
|
void nilfs_bmap_write(struct nilfs_bmap *, struct nilfs_inode *);
|
|
int nilfs_bmap_lookup_contig(struct nilfs_bmap *, __u64, __u64 *, unsigned);
|
|
int nilfs_bmap_insert(struct nilfs_bmap *, unsigned long, unsigned long);
|
|
int nilfs_bmap_delete(struct nilfs_bmap *, unsigned long);
|
|
int nilfs_bmap_last_key(struct nilfs_bmap *, unsigned long *);
|
|
int nilfs_bmap_truncate(struct nilfs_bmap *, unsigned long);
|
|
void nilfs_bmap_clear(struct nilfs_bmap *);
|
|
int nilfs_bmap_propagate(struct nilfs_bmap *, struct buffer_head *);
|
|
void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *, struct list_head *);
|
|
int nilfs_bmap_assign(struct nilfs_bmap *, struct buffer_head **,
|
|
unsigned long, union nilfs_binfo *);
|
|
int nilfs_bmap_lookup_at_level(struct nilfs_bmap *, __u64, int, __u64 *);
|
|
int nilfs_bmap_mark(struct nilfs_bmap *, __u64, int);
|
|
|
|
void nilfs_bmap_init_gc(struct nilfs_bmap *);
|
|
|
|
void nilfs_bmap_save(const struct nilfs_bmap *, struct nilfs_bmap_store *);
|
|
void nilfs_bmap_restore(struct nilfs_bmap *, const struct nilfs_bmap_store *);
|
|
|
|
static inline int nilfs_bmap_lookup(struct nilfs_bmap *bmap, __u64 key,
|
|
__u64 *ptr)
|
|
{
|
|
return nilfs_bmap_lookup_at_level(bmap, key, 1, ptr);
|
|
}
|
|
|
|
/*
|
|
* Internal use only
|
|
*/
|
|
struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *);
|
|
|
|
static inline int nilfs_bmap_prepare_alloc_ptr(struct nilfs_bmap *bmap,
|
|
union nilfs_bmap_ptr_req *req,
|
|
struct inode *dat)
|
|
{
|
|
if (dat)
|
|
return nilfs_dat_prepare_alloc(dat, &req->bpr_req);
|
|
/* ignore target ptr */
|
|
req->bpr_ptr = bmap->b_last_allocated_ptr++;
|
|
return 0;
|
|
}
|
|
|
|
static inline void nilfs_bmap_commit_alloc_ptr(struct nilfs_bmap *bmap,
|
|
union nilfs_bmap_ptr_req *req,
|
|
struct inode *dat)
|
|
{
|
|
if (dat)
|
|
nilfs_dat_commit_alloc(dat, &req->bpr_req);
|
|
}
|
|
|
|
static inline void nilfs_bmap_abort_alloc_ptr(struct nilfs_bmap *bmap,
|
|
union nilfs_bmap_ptr_req *req,
|
|
struct inode *dat)
|
|
{
|
|
if (dat)
|
|
nilfs_dat_abort_alloc(dat, &req->bpr_req);
|
|
else
|
|
bmap->b_last_allocated_ptr--;
|
|
}
|
|
|
|
static inline int nilfs_bmap_prepare_end_ptr(struct nilfs_bmap *bmap,
|
|
union nilfs_bmap_ptr_req *req,
|
|
struct inode *dat)
|
|
{
|
|
return dat ? nilfs_dat_prepare_end(dat, &req->bpr_req) : 0;
|
|
}
|
|
|
|
static inline void nilfs_bmap_commit_end_ptr(struct nilfs_bmap *bmap,
|
|
union nilfs_bmap_ptr_req *req,
|
|
struct inode *dat)
|
|
{
|
|
if (dat)
|
|
nilfs_dat_commit_end(dat, &req->bpr_req,
|
|
bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
|
|
}
|
|
|
|
static inline void nilfs_bmap_abort_end_ptr(struct nilfs_bmap *bmap,
|
|
union nilfs_bmap_ptr_req *req,
|
|
struct inode *dat)
|
|
{
|
|
if (dat)
|
|
nilfs_dat_abort_end(dat, &req->bpr_req);
|
|
}
|
|
|
|
static inline void nilfs_bmap_set_target_v(struct nilfs_bmap *bmap, __u64 key,
|
|
__u64 ptr)
|
|
{
|
|
bmap->b_last_allocated_key = key;
|
|
bmap->b_last_allocated_ptr = ptr;
|
|
}
|
|
|
|
__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *,
|
|
const struct buffer_head *);
|
|
|
|
__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *, __u64);
|
|
__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *);
|
|
|
|
|
|
/* Assume that bmap semaphore is locked. */
|
|
static inline int nilfs_bmap_dirty(const struct nilfs_bmap *bmap)
|
|
{
|
|
return !!(bmap->b_state & NILFS_BMAP_DIRTY);
|
|
}
|
|
|
|
/* Assume that bmap semaphore is locked. */
|
|
static inline void nilfs_bmap_set_dirty(struct nilfs_bmap *bmap)
|
|
{
|
|
bmap->b_state |= NILFS_BMAP_DIRTY;
|
|
}
|
|
|
|
/* Assume that bmap semaphore is locked. */
|
|
static inline void nilfs_bmap_clear_dirty(struct nilfs_bmap *bmap)
|
|
{
|
|
bmap->b_state &= ~NILFS_BMAP_DIRTY;
|
|
}
|
|
|
|
|
|
#define NILFS_BMAP_LARGE 0x1
|
|
|
|
#define NILFS_BMAP_SMALL_LOW NILFS_DIRECT_KEY_MIN
|
|
#define NILFS_BMAP_SMALL_HIGH NILFS_DIRECT_KEY_MAX
|
|
#define NILFS_BMAP_LARGE_LOW NILFS_BTREE_ROOT_NCHILDREN_MAX
|
|
#define NILFS_BMAP_LARGE_HIGH NILFS_BTREE_KEY_MAX
|
|
|
|
#endif /* _NILFS_BMAP_H */
|