jfs_imap.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *   Copyright (C) International Business Machines Corp., 2000-2002
 */
#ifndef	_H_JFS_IMAP
#define _H_JFS_IMAP

#include "jfs_txnmgr.h"

/*
 *	jfs_imap.h: disk inode manager
 */

#define EXTSPERIAG …
#define IMAPBLKNO …
#define SMAPSZ …
#define EXTSPERSUM …
#define L2EXTSPERSUM …
#define PGSPERIEXT …
#define MAXIAGS …
#define MAXAG …

#define AMAPSIZE …
#define SMAPSIZE …

/* convert inode number to iag number */
#define INOTOIAG(ino) …

/* convert iag number to logical block number of the iag page */
#define IAGTOLBLK(iagno,l2nbperpg) …

/* get the starting block number of the 4K page of an inode extent
 * that contains ino.
 */
#define INOPBLK(pxd,ino,l2nbperpg) …

/*
 *	inode allocation map:
 *
 * inode allocation map consists of
 * . the inode map control page and
 * . inode allocation group pages (per 4096 inodes)
 * which are addressed by standard JFS xtree.
 */
/*
 *	inode allocation group page (per 4096 inodes of an AG)
 */
struct iag { … };				/* (4096) */

/*
 *	per AG control information (in inode map control page)
 */
struct iagctl_disk { … };				/* (16) */

struct iagctl { … };

/*
 *	per fileset/aggregate inode map control page
 */
struct dinomap_disk { … };				/* (4096) */

struct dinomap { … };

/*
 *	In-core inode map control page
 */
struct inomap { … };

#define im_freeiag …
#define im_nextiag …
#define im_agctl …
#define im_nbperiext …
#define im_l2nbperiext …

/* for standalone testdriver
 */
#define im_diskblock …
#define im_maxag …

extern int diFree(struct inode *);
extern int diAlloc(struct inode *, bool, struct inode *);
extern int diSync(struct inode *);
/* external references */
extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
			bool is_free, struct tblock * tblk);
extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
extern int diMount(struct inode *);
extern int diUnmount(struct inode *, int);
extern int diRead(struct inode *);
extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
extern void diWriteSpecial(struct inode *, int);
extern void diFreeSpecial(struct inode *);
extern int diWrite(tid_t tid, struct inode *);
#endif				/* _H_JFS_IMAP */
linux/fs/jfs/jfs_imap.h
