/*
* Copyright (c) International Business Machines Corp., 2000
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _H_JFS_IMAP
#define _H_JFS_IMAP
#ifndef _JFS_UTILITY
#include <linux/jfs/jfs_lock.h>
#include <linux/jfs/jfs_txnmgr.h>
#endif
/*
* jfs_imap.h: disk inode manager
*/
#define EXTSPERIAG 128 /* number of disk inode extent per iag */
#define IMAPBLKNO 0 /* lblkno of dinomap within inode map */
#define SMAPSZ 4 /* number of words per summary map */
#define EXTSPERSUM 32 /* number of extents per summary map entry */
#define L2EXTSPERSUM 5 /* l2 number of extents per summary map */
#define PGSPERIEXT 4 /* number of 4K pages per dinode extent */
#define MAXIAGS ((1<<20)-1) /* maximum number of iags */
#define MAXAG 128 /* maximum number of allocation groups */
#define AMAPSIZE 512 /* bytes in the IAG allocation maps */
#define SMAPSIZE 16 /* bytes in the IAG summary maps */
/* convert inode number to iag number */
#define INOTOIAG(ino) ((ino) >> L2INOSPERIAG)
/* convert iag number to logical block number of the iag page */
#define IAGTOLBLK(iagno,l2nbperpg) (((iagno) + 1) << (l2nbperpg))
/* get the starting block number of the 4K page of an inode extent
* that contains ino.
*/
#define INOPBLK(pxd,ino,l2nbperpg) (addressPXD((pxd)) + \
((((ino) & (INOSPEREXT-1)) >> L2INOSPERPAGE) << (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)
*/
typedef struct {
s64 agstart; /* 8: starting block of ag */
s32 iagnum; /* 4: inode allocation group number */
s32 inofreefwd; /* 4: ag inode free list forward */
s32 inofreeback; /* 4: ag inode free list back */
s32 extfreefwd; /* 4: ag inode extent free list forward */
s32 extfreeback; /* 4: ag inode extent free list back */
s32 iagfree; /* 4: iag free list */
/* summary map: 1 bit per inode extent */
s32 inosmap[SMAPSZ]; /* 16: sum map of mapwords w/ free inodes;
* note: this indicates free and backed
* inodes, if the extent is not backed the
* value will be 1. if the extent is
* backed but all inodes are being used the
* value will be 1. if the extent is
* backed but at least one of the inodes is
* free the value will be 0.
*/
s32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */
s32 nfreeinos; /* 4: number of free inodes */
s32 nfreeexts; /* 4: number of free extents */
/* (72) */
u8 pad[1976]; /* 1976: pad to 2048 bytes */
/* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
u32 wmap[EXTSPERIAG]; /* 512: working allocation map */
u32 pmap[EXTSPERIAG]; /* 512: persistent allocation map */
pxd_t inoext[EXTSPERIAG]; /* 1024: inode extent addresses */
} iag_t; /* (4096) */
/*
* per AG control information (in inode map control page)
*/
typedef struct {
s32 inofree; /* 4: free inode list anchor */
s32 extfree; /* 4: free extent list anchor */
s32 numinos; /* 4: number of backed inodes */
s32 numfree; /* 4: number of free inodes */
} iagctl_t; /* (16) */
/*
* per fileset/aggregate inode map control page
*/
typedef struct {
s32 in_freeiag; /* 4: free iag list anchor */
s32 in_nextiag; /* 4: next free iag number */
s32 in_numinos; /* 4: num of backed inodes */
s32 in_numfree; /* 4: num of free backed inodes */
s32 in_nbperiext; /* 4: num of blocks per inode extent */
s32 in_l2nbperiext; /* 4: l2 of in_nbperiext */
s32 in_diskblock; /* 4: for standalone test driver */
s32 in_maxag; /* 4: for standalone test driver */
u8 pad[2016]; /* 2016: pad to 2048 */
iagctl_t in_agctl[MAXAG]; /* 2048: AG control information */
} dinomap_t; /* (4096) */
#ifndef _JFS_UTILITY
/*
* In-core inode map control page
*/
typedef struct inomap {
dinomap_t im_imap; /* 4096: inode allocation control */
struct inode *im_ipimap; /* 4: ptr to inode for imap */
MUTEXLOCK_T im_freelock; /* 4: iag free list lock */
MUTEXLOCK_T im_aglock[MAXAG]; /* 512: per AG locks */
u32 *im_DBGdimap;
atomic_t im_numinos; /* num of backed inodes */
atomic_t im_numfree; /* num of free backed inodes */
} imap_t;
#define im_freeiag im_imap.in_freeiag
#define im_nextiag im_imap.in_nextiag
#define im_agctl im_imap.in_agctl
#define im_nbperiext im_imap.in_nbperiext
#define im_l2nbperiext im_imap.in_l2nbperiext
/* for standalone testdriver
*/
#define im_diskblock im_imap.in_diskblock
#define im_maxag im_imap.in_maxag
int diFree(struct inode *);
int diAlloc(struct inode *, boolean_t, struct inode *);
int diSync(struct inode *);
/* external references */
int diUpdatePMap(struct inode *ipimap, unsigned long inum,
boolean_t is_free, tblock_t * tblk);
#ifdef _STILL_TO_PORT
int diExtendFS(inode_t * ipimap, inode_t * ipbmap);
#endif /* _STILL_TO_PORT */
int diMount(struct inode *);
int diUnmount(struct inode *, int);
int diRead(struct inode *);
void diClearExtension(struct inode *);
struct inode *diReadSpecial(struct super_block *, ino_t);
void diWriteSpecial(struct inode *);
void diFreeSpecial(struct inode *);
int diWrite(int tid, struct inode *);
#endif /* !_JFS_UTILITY */
#endif /* _H_JFS_IMAP */
