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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/mutex.h> |
23 | #include <linux/rwsem.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/bitops.h> |
26 | #include "jfs_types.h" |
27 | #include "jfs_xtree.h" |
28 | #include "jfs_dtree.h" |
29 | |
30 | /* |
31 | * JFS magic number |
32 | */ |
33 | #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */ |
34 | |
35 | /* |
36 | * JFS-private inode information |
37 | */ |
38 | struct jfs_inode_info { |
39 | int fileset; /* fileset number (always 16)*/ |
40 | uint mode2; /* jfs-specific mode */ |
41 | uint saved_uid; /* saved for uid mount option */ |
42 | uint saved_gid; /* saved for gid mount option */ |
43 | pxd_t ixpxd; /* inode extent descriptor */ |
44 | dxd_t acl; /* dxd describing acl */ |
45 | dxd_t ea; /* dxd describing ea */ |
46 | time_t otime; /* time created */ |
47 | uint next_index; /* next available directory entry index */ |
48 | int acltype; /* Type of ACL */ |
49 | short btorder; /* access order */ |
50 | short btindex; /* btpage entry index*/ |
51 | struct inode *ipimap; /* inode map */ |
52 | unsigned long cflag; /* commit flags */ |
53 | u16 bxflag; /* xflag of pseudo buffer? */ |
54 | unchar agno; /* ag number */ |
55 | signed char active_ag; /* ag currently allocating from */ |
56 | lid_t blid; /* lid of pseudo buffer? */ |
57 | lid_t atlhead; /* anonymous tlock list head */ |
58 | lid_t atltail; /* anonymous tlock list tail */ |
59 | spinlock_t ag_lock; /* protects active_ag */ |
60 | struct list_head anon_inode_list; /* inodes having anonymous txns */ |
61 | /* |
62 | * rdwrlock serializes xtree between reads & writes and synchronizes |
63 | * changes to special inodes. It's use would be redundant on |
64 | * directories since the i_mutex taken in the VFS is sufficient. |
65 | */ |
66 | struct rw_semaphore rdwrlock; |
67 | /* |
68 | * commit_mutex serializes transaction processing on an inode. |
69 | * It must be taken after beginning a transaction (txBegin), since |
70 | * dirty inodes may be committed while a new transaction on the |
71 | * inode is blocked in txBegin or TxBeginAnon |
72 | */ |
73 | struct mutex commit_mutex; |
74 | /* xattr_sem allows us to access the xattrs without taking i_mutex */ |
75 | struct rw_semaphore xattr_sem; |
76 | lid_t xtlid; /* lid of xtree lock on directory */ |
77 | union { |
78 | struct { |
79 | xtpage_t _xtroot; /* 288: xtree root */ |
80 | struct inomap *_imap; /* 4: inode map header */ |
81 | } file; |
82 | struct { |
83 | struct dir_table_slot _table[12]; /* 96: dir index */ |
84 | dtroot_t _dtroot; /* 288: dtree root */ |
85 | } dir; |
86 | struct { |
87 | unchar _unused[16]; /* 16: */ |
88 | dxd_t _dxd; /* 16: */ |
89 | unchar _inline[128]; /* 128: inline symlink */ |
90 | /* _inline_ea may overlay the last part of |
91 | * file._xtroot if maxentry = XTROOTINITSLOT |
92 | */ |
93 | unchar _inline_ea[128]; /* 128: inline extended attr */ |
94 | } link; |
95 | } u; |
96 | u32 dev; /* will die when we get wide dev_t */ |
97 | struct inode vfs_inode; |
98 | }; |
99 | #define i_xtroot u.file._xtroot |
100 | #define i_imap u.file._imap |
101 | #define i_dirtable u.dir._table |
102 | #define i_dtroot u.dir._dtroot |
103 | #define i_inline u.link._inline |
104 | #define i_inline_ea u.link._inline_ea |
105 | |
106 | #define IREAD_LOCK(ip, subclass) \ |
107 | down_read_nested(&JFS_IP(ip)->rdwrlock, subclass) |
108 | #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) |
109 | #define IWRITE_LOCK(ip, subclass) \ |
110 | down_write_nested(&JFS_IP(ip)->rdwrlock, subclass) |
111 | #define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock) |
112 | |
113 | /* |
114 | * cflag |
115 | */ |
116 | enum cflags { |
117 | COMMIT_Nolink, /* inode committed with zero link count */ |
118 | COMMIT_Inlineea, /* commit inode inline EA */ |
119 | COMMIT_Freewmap, /* free WMAP at iClose() */ |
120 | COMMIT_Dirty, /* Inode is really dirty */ |
121 | COMMIT_Dirtable, /* commit changes to di_dirtable */ |
122 | COMMIT_Stale, /* data extent is no longer valid */ |
123 | COMMIT_Synclist, /* metadata pages on group commit synclist */ |
124 | }; |
125 | |
126 | /* |
127 | * commit_mutex nesting subclasses: |
128 | */ |
129 | enum commit_mutex_class |
130 | { |
131 | COMMIT_MUTEX_PARENT, |
132 | COMMIT_MUTEX_CHILD, |
133 | COMMIT_MUTEX_SECOND_PARENT, /* Renaming */ |
134 | COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */ |
135 | }; |
136 | |
137 | /* |
138 | * rdwrlock subclasses: |
139 | * The dmap inode may be locked while a normal inode or the imap inode are |
140 | * locked. |
141 | */ |
142 | enum rdwrlock_class |
143 | { |
144 | RDWRLOCK_NORMAL, |
145 | RDWRLOCK_IMAP, |
146 | RDWRLOCK_DMAP |
147 | }; |
148 | |
149 | #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag)) |
150 | #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag)) |
151 | #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag)) |
152 | #define test_and_clear_cflag(flag, ip) \ |
153 | test_and_clear_bit(flag, &(JFS_IP(ip)->cflag)) |
154 | /* |
155 | * JFS-private superblock information. |
156 | */ |
157 | struct jfs_sb_info { |
158 | struct super_block *sb; /* Point back to vfs super block */ |
159 | unsigned long mntflag; /* aggregate attributes */ |
160 | struct inode *ipbmap; /* block map inode */ |
161 | struct inode *ipaimap; /* aggregate inode map inode */ |
162 | struct inode *ipaimap2; /* secondary aimap inode */ |
163 | struct inode *ipimap; /* aggregate inode map inode */ |
164 | struct jfs_log *log; /* log */ |
165 | struct list_head log_list; /* volumes associated with a journal */ |
166 | short bsize; /* logical block size */ |
167 | short l2bsize; /* log2 logical block size */ |
168 | short nbperpage; /* blocks per page */ |
169 | short l2nbperpage; /* log2 blocks per page */ |
170 | short l2niperblk; /* log2 inodes per page */ |
171 | dev_t logdev; /* external log device */ |
172 | uint aggregate; /* volume identifier in log record */ |
173 | pxd_t logpxd; /* pxd describing log */ |
174 | pxd_t fsckpxd; /* pxd describing fsck wkspc */ |
175 | pxd_t ait2; /* pxd describing AIT copy */ |
176 | char uuid[16]; /* 128-bit uuid for volume */ |
177 | char loguuid[16]; /* 128-bit uuid for log */ |
178 | /* |
179 | * commit_state is used for synchronization of the jfs_commit |
180 | * threads. It is protected by LAZY_LOCK(). |
181 | */ |
182 | int commit_state; /* commit state */ |
183 | /* Formerly in ipimap */ |
184 | uint gengen; /* inode generation generator*/ |
185 | uint inostamp; /* shows inode belongs to fileset*/ |
186 | |
187 | /* Formerly in ipbmap */ |
188 | struct bmap *bmap; /* incore bmap descriptor */ |
189 | struct nls_table *nls_tab; /* current codepage */ |
190 | struct inode *direct_inode; /* metadata inode */ |
191 | uint state; /* mount/recovery state */ |
192 | unsigned long flag; /* mount time flags */ |
193 | uint p_state; /* state prior to going no integrity */ |
194 | uint uid; /* uid to override on-disk uid */ |
195 | uint gid; /* gid to override on-disk gid */ |
196 | uint umask; /* umask to override on-disk umask */ |
197 | }; |
198 | |
199 | /* jfs_sb_info commit_state */ |
200 | #define IN_LAZYCOMMIT 1 |
201 | |
202 | static inline struct jfs_inode_info *JFS_IP(struct inode *inode) |
203 | { |
204 | return list_entry(inode, struct jfs_inode_info, vfs_inode); |
205 | } |
206 | |
207 | static inline int jfs_dirtable_inline(struct inode *inode) |
208 | { |
209 | return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1)); |
210 | } |
211 | |
212 | static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb) |
213 | { |
214 | return sb->s_fs_info; |
215 | } |
216 | |
217 | static inline int isReadOnly(struct inode *inode) |
218 | { |
219 | if (JFS_SBI(inode->i_sb)->log) |
220 | return 0; |
221 | return 1; |
222 | } |
223 | #endif /* _H_JFS_INCORE */ |
224 |
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