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1da177e4 LT |
1 | /* |
2 | * Copyright (C) International Business Machines Corp., 2000-2004 | |
3 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | #ifndef _H_JFS_INCORE | |
20 | #define _H_JFS_INCORE | |
21 | ||
22 | #include <linux/rwsem.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/bitops.h> | |
25 | #include "jfs_types.h" | |
26 | #include "jfs_xtree.h" | |
27 | #include "jfs_dtree.h" | |
28 | ||
29 | /* | |
30 | * JFS magic number | |
31 | */ | |
32 | #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */ | |
33 | ||
34 | /* | |
35 | * JFS-private inode information | |
36 | */ | |
37 | struct jfs_inode_info { | |
38 | int fileset; /* fileset number (always 16)*/ | |
39 | uint mode2; /* jfs-specific mode */ | |
40 | pxd_t ixpxd; /* inode extent descriptor */ | |
41 | dxd_t acl; /* dxd describing acl */ | |
42 | dxd_t ea; /* dxd describing ea */ | |
43 | time_t otime; /* time created */ | |
44 | uint next_index; /* next available directory entry index */ | |
45 | int acltype; /* Type of ACL */ | |
46 | short btorder; /* access order */ | |
47 | short btindex; /* btpage entry index*/ | |
48 | struct inode *ipimap; /* inode map */ | |
49 | long cflag; /* commit flags */ | |
50 | u16 bxflag; /* xflag of pseudo buffer? */ | |
51 | unchar agno; /* ag number */ | |
52 | signed char active_ag; /* ag currently allocating from */ | |
53 | lid_t blid; /* lid of pseudo buffer? */ | |
54 | lid_t atlhead; /* anonymous tlock list head */ | |
55 | lid_t atltail; /* anonymous tlock list tail */ | |
56 | spinlock_t ag_lock; /* protects active_ag */ | |
57 | struct list_head anon_inode_list; /* inodes having anonymous txns */ | |
58 | /* | |
59 | * rdwrlock serializes xtree between reads & writes and synchronizes | |
60 | * changes to special inodes. It's use would be redundant on | |
61 | * directories since the i_sem taken in the VFS is sufficient. | |
62 | */ | |
63 | struct rw_semaphore rdwrlock; | |
64 | /* | |
65 | * commit_sem serializes transaction processing on an inode. | |
66 | * It must be taken after beginning a transaction (txBegin), since | |
67 | * dirty inodes may be committed while a new transaction on the | |
68 | * inode is blocked in txBegin or TxBeginAnon | |
69 | */ | |
70 | struct semaphore commit_sem; | |
71 | /* xattr_sem allows us to access the xattrs without taking i_sem */ | |
72 | struct rw_semaphore xattr_sem; | |
73 | lid_t xtlid; /* lid of xtree lock on directory */ | |
74 | #ifdef CONFIG_JFS_POSIX_ACL | |
75 | struct posix_acl *i_acl; | |
76 | struct posix_acl *i_default_acl; | |
77 | #endif | |
78 | union { | |
79 | struct { | |
80 | xtpage_t _xtroot; /* 288: xtree root */ | |
81 | struct inomap *_imap; /* 4: inode map header */ | |
82 | } file; | |
83 | struct { | |
84 | struct dir_table_slot _table[12]; /* 96: dir index */ | |
85 | dtroot_t _dtroot; /* 288: dtree root */ | |
86 | } dir; | |
87 | struct { | |
88 | unchar _unused[16]; /* 16: */ | |
89 | dxd_t _dxd; /* 16: */ | |
90 | unchar _inline[128]; /* 128: inline symlink */ | |
91 | /* _inline_ea may overlay the last part of | |
92 | * file._xtroot if maxentry = XTROOTINITSLOT | |
93 | */ | |
94 | unchar _inline_ea[128]; /* 128: inline extended attr */ | |
95 | } link; | |
96 | } u; | |
97 | u32 dev; /* will die when we get wide dev_t */ | |
98 | struct inode vfs_inode; | |
99 | }; | |
100 | #define i_xtroot u.file._xtroot | |
101 | #define i_imap u.file._imap | |
102 | #define i_dirtable u.dir._table | |
103 | #define i_dtroot u.dir._dtroot | |
104 | #define i_inline u.link._inline | |
105 | #define i_inline_ea u.link._inline_ea | |
106 | ||
107 | #define JFS_ACL_NOT_CACHED ((void *)-1) | |
108 | ||
109 | #define IREAD_LOCK(ip) down_read(&JFS_IP(ip)->rdwrlock) | |
110 | #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) | |
111 | #define IWRITE_LOCK(ip) down_write(&JFS_IP(ip)->rdwrlock) | |
112 | #define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock) | |
113 | ||
114 | /* | |
115 | * cflag | |
116 | */ | |
117 | enum cflags { | |
118 | COMMIT_Nolink, /* inode committed with zero link count */ | |
119 | COMMIT_Inlineea, /* commit inode inline EA */ | |
120 | COMMIT_Freewmap, /* free WMAP at iClose() */ | |
121 | COMMIT_Dirty, /* Inode is really dirty */ | |
122 | COMMIT_Dirtable, /* commit changes to di_dirtable */ | |
123 | COMMIT_Stale, /* data extent is no longer valid */ | |
124 | COMMIT_Synclist, /* metadata pages on group commit synclist */ | |
125 | }; | |
126 | ||
127 | #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag)) | |
128 | #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag)) | |
129 | #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag)) | |
130 | #define test_and_clear_cflag(flag, ip) \ | |
131 | test_and_clear_bit(flag, &(JFS_IP(ip)->cflag)) | |
132 | /* | |
133 | * JFS-private superblock information. | |
134 | */ | |
135 | struct jfs_sb_info { | |
136 | struct super_block *sb; /* Point back to vfs super block */ | |
137 | unsigned long mntflag; /* aggregate attributes */ | |
138 | struct inode *ipbmap; /* block map inode */ | |
139 | struct inode *ipaimap; /* aggregate inode map inode */ | |
140 | struct inode *ipaimap2; /* secondary aimap inode */ | |
141 | struct inode *ipimap; /* aggregate inode map inode */ | |
142 | struct jfs_log *log; /* log */ | |
143 | struct list_head log_list; /* volumes associated with a journal */ | |
144 | short bsize; /* logical block size */ | |
145 | short l2bsize; /* log2 logical block size */ | |
146 | short nbperpage; /* blocks per page */ | |
147 | short l2nbperpage; /* log2 blocks per page */ | |
148 | short l2niperblk; /* log2 inodes per page */ | |
149 | dev_t logdev; /* external log device */ | |
150 | uint aggregate; /* volume identifier in log record */ | |
151 | pxd_t logpxd; /* pxd describing log */ | |
152 | pxd_t fsckpxd; /* pxd describing fsck wkspc */ | |
153 | pxd_t ait2; /* pxd describing AIT copy */ | |
154 | char uuid[16]; /* 128-bit uuid for volume */ | |
155 | char loguuid[16]; /* 128-bit uuid for log */ | |
156 | /* | |
157 | * commit_state is used for synchronization of the jfs_commit | |
158 | * threads. It is protected by LAZY_LOCK(). | |
159 | */ | |
160 | int commit_state; /* commit state */ | |
161 | /* Formerly in ipimap */ | |
162 | uint gengen; /* inode generation generator*/ | |
163 | uint inostamp; /* shows inode belongs to fileset*/ | |
164 | ||
165 | /* Formerly in ipbmap */ | |
166 | struct bmap *bmap; /* incore bmap descriptor */ | |
167 | struct nls_table *nls_tab; /* current codepage */ | |
168 | uint state; /* mount/recovery state */ | |
169 | unsigned long flag; /* mount time flags */ | |
170 | uint p_state; /* state prior to going no integrity */ | |
171 | }; | |
172 | ||
173 | /* jfs_sb_info commit_state */ | |
174 | #define IN_LAZYCOMMIT 1 | |
175 | ||
176 | static inline struct jfs_inode_info *JFS_IP(struct inode *inode) | |
177 | { | |
178 | return list_entry(inode, struct jfs_inode_info, vfs_inode); | |
179 | } | |
180 | ||
181 | static inline int jfs_dirtable_inline(struct inode *inode) | |
182 | { | |
183 | return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1)); | |
184 | } | |
185 | ||
186 | static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb) | |
187 | { | |
188 | return sb->s_fs_info; | |
189 | } | |
190 | ||
191 | static inline int isReadOnly(struct inode *inode) | |
192 | { | |
193 | if (JFS_SBI(inode->i_sb)->log) | |
194 | return 0; | |
195 | return 1; | |
196 | } | |
197 | #endif /* _H_JFS_INCORE */ |