Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
jfs_imap.h
Go to the documentation of this file.
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 */
Generated on Thu Jan 10 2013 14:47:47 for Linux Kernel by   doxygen 1.8.2