jfs_imap.h
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/*
* Copyright (C) International Business Machines Corp., 2000-2002
*
* 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
#include "jfs_txnmgr.h"
/*
* 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)
*/
struct iag {
__le64 agstart; /* 8: starting block of ag */
__le32 iagnum; /* 4: inode allocation group number */
__le32 inofreefwd; /* 4: ag inode free list forward */
__le32 inofreeback; /* 4: ag inode free list back */
__le32 extfreefwd; /* 4: ag inode extent free list forward */
__le32 extfreeback; /* 4: ag inode extent free list back */
__le32 iagfree; /* 4: iag free list */
/* summary map: 1 bit per inode extent */
__le32 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.
*/
__le32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */
__le32 nfreeinos; /* 4: number of free inodes */
__le32 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) */
__le32 wmap[EXTSPERIAG]; /* 512: working allocation map */
__le32 pmap[EXTSPERIAG]; /* 512: persistent allocation map */
pxd_t inoext[EXTSPERIAG]; /* 1024: inode extent addresses */
}; /* (4096) */
/*
* per AG control information (in inode map control page)
*/
struct iagctl_disk {
__le32 inofree; /* 4: free inode list anchor */
__le32 extfree; /* 4: free extent list anchor */
__le32 numinos; /* 4: number of backed inodes */
__le32 numfree; /* 4: number of free inodes */
}; /* (16) */
struct iagctl {
int inofree; /* free inode list anchor */
int extfree; /* free extent list anchor */
int numinos; /* number of backed inodes */
int numfree; /* number of free inodes */
};
/*
* per fileset/aggregate inode map control page
*/
struct dinomap_disk {
__le32 in_freeiag; /* 4: free iag list anchor */
__le32 in_nextiag; /* 4: next free iag number */
__le32 in_numinos; /* 4: num of backed inodes */
__le32 in_numfree; /* 4: num of free backed inodes */
__le32 in_nbperiext; /* 4: num of blocks per inode extent */
__le32 in_l2nbperiext; /* 4: l2 of in_nbperiext */
__le32 in_diskblock; /* 4: for standalone test driver */
__le32 in_maxag; /* 4: for standalone test driver */
u8 pad[2016]; /* 2016: pad to 2048 */
struct iagctl_disk in_agctl[MAXAG]; /* 2048: AG control information */
}; /* (4096) */
struct dinomap {
int in_freeiag; /* free iag list anchor */
int in_nextiag; /* next free iag number */
int in_numinos; /* num of backed inodes */
int in_numfree; /* num of free backed inodes */
int in_nbperiext; /* num of blocks per inode extent */
int in_l2nbperiext; /* l2 of in_nbperiext */
int in_diskblock; /* for standalone test driver */
int in_maxag; /* for standalone test driver */
struct iagctl in_agctl[MAXAG]; /* AG control information */
};
/*
* In-core inode map control page
*/
struct inomap {
struct dinomap im_imap; /* 4096: inode allocation control */
struct inode *im_ipimap; /* 4: ptr to inode for imap */
struct mutex im_freelock; /* 4: iag free list lock */
struct mutex 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 */
};
#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
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 */