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	__le64 agstart;		/* 8: starting block of ag		*/
64	__le32 iagnum;		/* 4: inode allocation group number	*/
65	__le32 inofreefwd;	/* 4: ag inode free list forward	*/
66	__le32 inofreeback;	/* 4: ag inode free list back		*/
67	__le32 extfreefwd;	/* 4: ag inode extent free list forward	*/
68	__le32 extfreeback;	/* 4: ag inode extent free list back	*/
69	__le32 iagfree;		/* 4: iag free list			*/
70
71	/* summary map: 1 bit per inode extent */
72	__le32 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	__le32 extsmap[SMAPSZ];	/* 16: sum map of mapwords w/ free extents */
82	__le32 nfreeinos;	/* 4: number of free inodes		*/
83	__le32 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	__le32 wmap[EXTSPERIAG];	/* 512: working allocation map */
88	__le32 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_disk {
96	__le32 inofree;		/* 4: free inode list anchor		*/
97	__le32 extfree;		/* 4: free extent list anchor		*/
98	__le32 numinos;		/* 4: number of backed inodes		*/
99	__le32 numfree;		/* 4: number of free inodes		*/
100};				/* (16) */
101
102struct iagctl {
103	int inofree;		/* free inode list anchor		*/
104	int extfree;		/* free extent list anchor		*/
105	int numinos;		/* number of backed inodes		*/
106	int numfree;		/* number of free inodes		*/
107};
108
109/*
110 *	per fileset/aggregate inode map control page
111 */
112struct dinomap_disk {
113	__le32 in_freeiag;	/* 4: free iag list anchor	*/
114	__le32 in_nextiag;	/* 4: next free iag number	*/
115	__le32 in_numinos;	/* 4: num of backed inodes	*/
116	__le32 in_numfree;	/* 4: num of free backed inodes */
117	__le32 in_nbperiext;	/* 4: num of blocks per inode extent */
118	__le32 in_l2nbperiext;	/* 4: l2 of in_nbperiext	*/
119	__le32 in_diskblock;	/* 4: for standalone test driver */
120	__le32 in_maxag;	/* 4: for standalone test driver */
121	u8 pad[2016];		/* 2016: pad to 2048		*/
122	struct iagctl_disk in_agctl[MAXAG]; /* 2048: AG control information */
123};				/* (4096) */
124
125struct dinomap {
126	int in_freeiag;		/* free iag list anchor		*/
127	int in_nextiag;		/* next free iag number		*/
128	int in_numinos;		/* num of backed inodes		*/
129	int in_numfree;		/* num of free backed inodes	*/
130	int in_nbperiext;	/* num of blocks per inode extent */
131	int in_l2nbperiext;	/* l2 of in_nbperiext		*/
132	int in_diskblock;	/* for standalone test driver	*/
133	int in_maxag;		/* for standalone test driver	*/
134	struct iagctl in_agctl[MAXAG];	/* AG control information */
135};
136
137/*
138 *	In-core inode map control page
139 */
140struct inomap {
141	struct dinomap im_imap;		/* 4096: inode allocation control */
142	struct inode *im_ipimap;	/* 4: ptr to inode for imap	*/
143	struct mutex im_freelock;	/* 4: iag free list lock	*/
144	struct mutex im_aglock[MAXAG];	/* 512: per AG locks		*/
145	u32 *im_DBGdimap;
146	atomic_t im_numinos;	/* num of backed inodes */
147	atomic_t im_numfree;	/* num of free backed inodes */
148};
149
150#define	im_freeiag	im_imap.in_freeiag
151#define	im_nextiag	im_imap.in_nextiag
152#define	im_agctl	im_imap.in_agctl
153#define	im_nbperiext	im_imap.in_nbperiext
154#define	im_l2nbperiext	im_imap.in_l2nbperiext
155
156/* for standalone testdriver
157 */
158#define	im_diskblock	im_imap.in_diskblock
159#define	im_maxag	im_imap.in_maxag
160
161extern int diFree(struct inode *);
162extern int diAlloc(struct inode *, bool, struct inode *);
163extern int diSync(struct inode *);
164/* external references */
165extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
166			bool is_free, struct tblock * tblk);
167extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
168extern int diMount(struct inode *);
169extern int diUnmount(struct inode *, int);
170extern int diRead(struct inode *);
171extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
172extern void diWriteSpecial(struct inode *, int);
173extern void diFreeSpecial(struct inode *);
174extern int diWrite(tid_t tid, struct inode *);
175#endif				/* _H_JFS_IMAP */
176