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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 | */ |
62 | struct 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 | */ |
95 | struct 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 | |
102 | struct 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 | */ |
112 | struct 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 | |
125 | struct 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 | */ |
140 | struct 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 | |
161 | extern int diFree(struct inode *); |
162 | extern int diAlloc(struct inode *, bool, struct inode *); |
163 | extern int diSync(struct inode *); |
164 | /* external references */ |
165 | extern int diUpdatePMap(struct inode *ipimap, unsigned long inum, |
166 | bool is_free, struct tblock * tblk); |
167 | extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap); |
168 | extern int diMount(struct inode *); |
169 | extern int diUnmount(struct inode *, int); |
170 | extern int diRead(struct inode *); |
171 | extern struct inode *diReadSpecial(struct super_block *, ino_t, int); |
172 | extern void diWriteSpecial(struct inode *, int); |
173 | extern void diFreeSpecial(struct inode *); |
174 | extern int diWrite(tid_t tid, struct inode *); |
175 | #endif /* _H_JFS_IMAP */ |
176 |
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