1/*
2 *   Copyright (c) International Business Machines Corp., 2000-2002
3 *
4 *   This program is free software;  you can redistribute it and/or modify
5 *   it under the terms of the GNU General Public License as published by
6 *   the Free Software Foundation; either version 2 of the License, or
7 *   (at your option) any later version.
8 *
9 *   This program is distributed in the hope that it will be useful,
10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 *   the GNU General Public License for more details.
13 *
14 *   You should have received a copy of the GNU General Public License
15 *   along with this program;  if not, write to the Free Software
16 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18#ifndef	_H_JFS_IMAP
19#define _H_JFS_IMAP
20
21#include "jfs_txnmgr.h"
22
23/*
24 *	jfs_imap.h: disk inode manager
25 */
26
27#define	EXTSPERIAG	128	/* number of disk inode extent per iag  */
28#define IMAPBLKNO	0	/* lblkno of dinomap within inode map   */
29#define SMAPSZ		4	/* number of words per summary map      */
30#define	EXTSPERSUM	32	/* number of extents per summary map entry */
31#define	L2EXTSPERSUM	5	/* l2 number of extents per summary map */
32#define	PGSPERIEXT	4	/* number of 4K pages per dinode extent */
33#define	MAXIAGS		((1<<20)-1)	/* maximum number of iags       */
34#define	MAXAG		128	/* maximum number of allocation groups  */
35
36#define AMAPSIZE      512	/* bytes in the IAG allocation maps */
37#define SMAPSIZE      16	/* bytes in the IAG summary maps */
38
39/* convert inode number to iag number */
40#define	INOTOIAG(ino)	((ino) >> L2INOSPERIAG)
41
42/* convert iag number to logical block number of the iag page */
43#define IAGTOLBLK(iagno,l2nbperpg)	(((iagno) + 1) << (l2nbperpg))
44
45/* get the starting block number of the 4K page of an inode extent
46 * that contains ino.
47 */
48#define INOPBLK(pxd,ino,l2nbperpg)    	(addressPXD((pxd)) +		\
49	((((ino) & (INOSPEREXT-1)) >> L2INOSPERPAGE) << (l2nbperpg)))
50
51/*
52 *	inode allocation map:
53 *
54 * inode allocation map consists of
55 * . the inode map control page and
56 * . inode allocation group pages (per 4096 inodes)
57 * which are addressed by standard JFS xtree.
58 */
59/*
60 *	inode allocation group page (per 4096 inodes of an AG)
61 */
62struct iag {
63	s64 agstart;		/* 8: starting block of ag              */
64	s32 iagnum;		/* 4: inode allocation group number     */
65	s32 inofreefwd;		/* 4: ag inode free list forward        */
66	s32 inofreeback;	/* 4: ag inode free list back           */
67	s32 extfreefwd;		/* 4: ag inode extent free list forward */
68	s32 extfreeback;	/* 4: ag inode extent free list back    */
69	s32 iagfree;		/* 4: iag free list                     */
70
71	/* summary map: 1 bit per inode extent */
72	s32 inosmap[SMAPSZ];	/* 16: sum map of mapwords w/ free inodes;
73				 *      note: this indicates free and backed
74				 *      inodes, if the extent is not backed the
75				 *      value will be 1.  if the extent is
76				 *      backed but all inodes are being used the
77				 *      value will be 1.  if the extent is
78				 *      backed but at least one of the inodes is
79				 *      free the value will be 0.
80				 */
81	s32 extsmap[SMAPSZ];	/* 16: sum map of mapwords w/ free extents */
82	s32 nfreeinos;		/* 4: number of free inodes             */
83	s32 nfreeexts;		/* 4: number of free extents            */
84	/* (72) */
85	u8 pad[1976];		/* 1976: pad to 2048 bytes */
86	/* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
87	u32 wmap[EXTSPERIAG];	/* 512: working allocation map  */
88	u32 pmap[EXTSPERIAG];	/* 512: persistent allocation map */
89	pxd_t inoext[EXTSPERIAG];	/* 1024: inode extent addresses */
90};				/* (4096) */
91
92/*
93 *	per AG control information (in inode map control page)
94 */
95struct iagctl {
96	s32 inofree;		/* 4: free inode list anchor            */
97	s32 extfree;		/* 4: free extent list anchor           */
98	s32 numinos;		/* 4: number of backed inodes           */
99	s32 numfree;		/* 4: number of free inodes             */
100};				/* (16) */
101
102/*
103 *	per fileset/aggregate inode map control page
104 */
105struct dinomap {
106	s32 in_freeiag;		/* 4: free iag list anchor     */
107	s32 in_nextiag;		/* 4: next free iag number     */
108	s32 in_numinos;		/* 4: num of backed inodes */
109	s32 in_numfree;		/* 4: num of free backed inodes */
110	s32 in_nbperiext;	/* 4: num of blocks per inode extent */
111	s32 in_l2nbperiext;	/* 4: l2 of in_nbperiext */
112	s32 in_diskblock;	/* 4: for standalone test driver  */
113	s32 in_maxag;		/* 4: for standalone test driver  */
114	u8 pad[2016];		/* 2016: pad to 2048 */
115	struct iagctl in_agctl[MAXAG];	/* 2048: AG control information */
116};				/* (4096) */
117
118
119/*
120 *	In-core inode map control page
121 */
122struct inomap {
123	struct dinomap im_imap;		/* 4096: inode allocation control */
124	struct inode *im_ipimap;	/* 4: ptr to inode for imap   */
125	struct semaphore im_freelock;	/* 4: iag free list lock      */
126	struct semaphore im_aglock[MAXAG];	/* 512: per AG locks          */
127	u32 *im_DBGdimap;
128	atomic_t im_numinos;	/* num of backed inodes */
129	atomic_t im_numfree;	/* num of free backed inodes */
130};
131
132#define	im_freeiag	im_imap.in_freeiag
133#define	im_nextiag	im_imap.in_nextiag
134#define	im_agctl	im_imap.in_agctl
135#define	im_nbperiext	im_imap.in_nbperiext
136#define	im_l2nbperiext	im_imap.in_l2nbperiext
137
138/* for standalone testdriver
139 */
140#define	im_diskblock	im_imap.in_diskblock
141#define	im_maxag	im_imap.in_maxag
142
143extern int diFree(struct inode *);
144extern int diAlloc(struct inode *, boolean_t, struct inode *);
145extern int diSync(struct inode *);
146/* external references */
147extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
148			boolean_t is_free, struct tblock * tblk);
149extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
150extern int diMount(struct inode *);
151extern int diUnmount(struct inode *, int);
152extern int diRead(struct inode *);
153extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
154extern void diWriteSpecial(struct inode *, int);
155extern void diFreeSpecial(struct inode *);
156extern int diWrite(tid_t tid, struct inode *);
157#endif				/* _H_JFS_IMAP */
158