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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
* Copyright (C) International Business Machines Corp., 2000-2004
* Portions Copyright (C) Christoph Hellwig, 2001-2002
*
* 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_INCORE
#define _H_JFS_INCORE
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include "jfs_types.h"
#include "jfs_xtree.h"
#include "jfs_dtree.h"
/*
* JFS magic number
*/
#define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
/*
* JFS-private inode information
*/
struct jfs_inode_info {
int fileset; /* fileset number (always 16)*/
uint mode2; /* jfs-specific mode */
uint saved_uid; /* saved for uid mount option */
uint saved_gid; /* saved for gid mount option */
pxd_t ixpxd; /* inode extent descriptor */
dxd_t acl; /* dxd describing acl */
dxd_t ea; /* dxd describing ea */
time_t otime; /* time created */
uint next_index; /* next available directory entry index */
int acltype; /* Type of ACL */
short btorder; /* access order */
short btindex; /* btpage entry index*/
struct inode *ipimap; /* inode map */
unsigned long cflag; /* commit flags */
long agstart; /* agstart of the containing IAG */
u16 bxflag; /* xflag of pseudo buffer? */
unchar pad;
signed char active_ag; /* ag currently allocating from */
lid_t blid; /* lid of pseudo buffer? */
lid_t atlhead; /* anonymous tlock list head */
lid_t atltail; /* anonymous tlock list tail */
spinlock_t ag_lock; /* protects active_ag */
struct list_head anon_inode_list; /* inodes having anonymous txns */
/*
* rdwrlock serializes xtree between reads & writes and synchronizes
* changes to special inodes. It's use would be redundant on
* directories since the i_mutex taken in the VFS is sufficient.
*/
struct rw_semaphore rdwrlock;
/*
* commit_mutex serializes transaction processing on an inode.
* It must be taken after beginning a transaction (txBegin), since
* dirty inodes may be committed while a new transaction on the
* inode is blocked in txBegin or TxBeginAnon
*/
struct mutex commit_mutex;
/* xattr_sem allows us to access the xattrs without taking i_mutex */
struct rw_semaphore xattr_sem;
lid_t xtlid; /* lid of xtree lock on directory */
union {
struct {
xtpage_t _xtroot; /* 288: xtree root */
struct inomap *_imap; /* 4: inode map header */
} file;
struct {
struct dir_table_slot _table[12]; /* 96: dir index */
dtroot_t _dtroot; /* 288: dtree root */
} dir;
struct {
unchar _unused[16]; /* 16: */
dxd_t _dxd; /* 16: */
unchar _inline[128]; /* 128: inline symlink */
/* _inline_ea may overlay the last part of
* file._xtroot if maxentry = XTROOTINITSLOT
*/
unchar _inline_ea[128]; /* 128: inline extended attr */
} link;
} u;
u32 dev; /* will die when we get wide dev_t */
struct inode vfs_inode;
};
#define i_xtroot u.file._xtroot
#define i_imap u.file._imap
#define i_dirtable u.dir._table
#define i_dtroot u.dir._dtroot
#define i_inline u.link._inline
#define i_inline_ea u.link._inline_ea
#define IREAD_LOCK(ip, subclass) \
down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
#define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock)
#define IWRITE_LOCK(ip, subclass) \
down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
#define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock)
/*
* cflag
*/
enum cflags {
COMMIT_Nolink, /* inode committed with zero link count */
COMMIT_Inlineea, /* commit inode inline EA */
COMMIT_Freewmap, /* free WMAP at iClose() */
COMMIT_Dirty, /* Inode is really dirty */
COMMIT_Dirtable, /* commit changes to di_dirtable */
COMMIT_Stale, /* data extent is no longer valid */
COMMIT_Synclist, /* metadata pages on group commit synclist */
};
/*
* commit_mutex nesting subclasses:
*/
enum commit_mutex_class
{
COMMIT_MUTEX_PARENT,
COMMIT_MUTEX_CHILD,
COMMIT_MUTEX_SECOND_PARENT, /* Renaming */
COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */
};
/*
* rdwrlock subclasses:
* The dmap inode may be locked while a normal inode or the imap inode are
* locked.
*/
enum rdwrlock_class
{
RDWRLOCK_NORMAL,
RDWRLOCK_IMAP,
RDWRLOCK_DMAP
};
#define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag))
#define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag))
#define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag))
#define test_and_clear_cflag(flag, ip) \
test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
/*
* JFS-private superblock information.
*/
struct jfs_sb_info {
struct super_block *sb; /* Point back to vfs super block */
unsigned long mntflag; /* aggregate attributes */
struct inode *ipbmap; /* block map inode */
struct inode *ipaimap; /* aggregate inode map inode */
struct inode *ipaimap2; /* secondary aimap inode */
struct inode *ipimap; /* aggregate inode map inode */
struct jfs_log *log; /* log */
struct list_head log_list; /* volumes associated with a journal */
short bsize; /* logical block size */
short l2bsize; /* log2 logical block size */
short nbperpage; /* blocks per page */
short l2nbperpage; /* log2 blocks per page */
short l2niperblk; /* log2 inodes per page */
dev_t logdev; /* external log device */
uint aggregate; /* volume identifier in log record */
pxd_t logpxd; /* pxd describing log */
pxd_t fsckpxd; /* pxd describing fsck wkspc */
pxd_t ait2; /* pxd describing AIT copy */
char uuid[16]; /* 128-bit uuid for volume */
char loguuid[16]; /* 128-bit uuid for log */
/*
* commit_state is used for synchronization of the jfs_commit
* threads. It is protected by LAZY_LOCK().
*/
int commit_state; /* commit state */
/* Formerly in ipimap */
uint gengen; /* inode generation generator*/
uint inostamp; /* shows inode belongs to fileset*/
/* Formerly in ipbmap */
struct bmap *bmap; /* incore bmap descriptor */
struct nls_table *nls_tab; /* current codepage */
struct inode *direct_inode; /* metadata inode */
uint state; /* mount/recovery state */
unsigned long flag; /* mount time flags */
uint p_state; /* state prior to going no integrity */
uint uid; /* uid to override on-disk uid */
uint gid; /* gid to override on-disk gid */
uint umask; /* umask to override on-disk umask */
};
/* jfs_sb_info commit_state */
#define IN_LAZYCOMMIT 1
static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
{
return list_entry(inode, struct jfs_inode_info, vfs_inode);
}
static inline int jfs_dirtable_inline(struct inode *inode)
{
return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
}
static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
{
return sb->s_fs_info;
}
static inline int isReadOnly(struct inode *inode)
{
if (JFS_SBI(inode->i_sb)->log)
return 0;
return 1;
}
#endif /* _H_JFS_INCORE */
|
