summaryrefslogtreecommitdiff
path: root/fs/jfs/jfs_imap.h
blob: 4f9c346ed49868eaa6f9546a3be6299bdac0c294 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
/*
 *   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 */