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 u64 agstart; /* agstart of the containing IAG */
54 u16 bxflag; /* xflag of pseudo buffer? */
55 unchar pad;
56 signed char active_ag; /* ag currently allocating from */
57 lid_t blid; /* lid of pseudo buffer? */
58 lid_t atlhead; /* anonymous tlock list head */
59 lid_t atltail; /* anonymous tlock list tail */
60 spinlock_t ag_lock; /* protects active_ag */
61 struct list_head anon_inode_list; /* inodes having anonymous txns */
62 /*
63 * rdwrlock serializes xtree between reads & writes and synchronizes
64 * changes to special inodes. It's use would be redundant on
65 * directories since the i_mutex taken in the VFS is sufficient.
66 */
67 struct rw_semaphore rdwrlock;
68 /*
69 * commit_mutex serializes transaction processing on an inode.
70 * It must be taken after beginning a transaction (txBegin), since
71 * dirty inodes may be committed while a new transaction on the
72 * inode is blocked in txBegin or TxBeginAnon
73 */
74 struct mutex commit_mutex;
75 /* xattr_sem allows us to access the xattrs without taking i_mutex */
76 struct rw_semaphore xattr_sem;
77 lid_t xtlid; /* lid of xtree lock on directory */
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 IREAD_LOCK(ip, subclass) \
108 down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
109 #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock)
110 #define IWRITE_LOCK(ip, subclass) \
111 down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
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 /*
128 * commit_mutex nesting subclasses:
129 */
130 enum commit_mutex_class
131 {
132 COMMIT_MUTEX_PARENT,
133 COMMIT_MUTEX_CHILD,
134 COMMIT_MUTEX_SECOND_PARENT, /* Renaming */
135 COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */
136 };
137
138 /*
139 * rdwrlock subclasses:
140 * The dmap inode may be locked while a normal inode or the imap inode are
141 * locked.
142 */
143 enum rdwrlock_class
144 {
145 RDWRLOCK_NORMAL,
146 RDWRLOCK_IMAP,
147 RDWRLOCK_DMAP
148 };
149
150 #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag))
151 #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag))
152 #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag))
153 #define test_and_clear_cflag(flag, ip) \
154 test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
155 /*
156 * JFS-private superblock information.
157 */
158 struct jfs_sb_info {
159 struct super_block *sb; /* Point back to vfs super block */
160 unsigned long mntflag; /* aggregate attributes */
161 struct inode *ipbmap; /* block map inode */
162 struct inode *ipaimap; /* aggregate inode map inode */
163 struct inode *ipaimap2; /* secondary aimap inode */
164 struct inode *ipimap; /* aggregate inode map inode */
165 struct jfs_log *log; /* log */
166 struct list_head log_list; /* volumes associated with a journal */
167 short bsize; /* logical block size */
168 short l2bsize; /* log2 logical block size */
169 short nbperpage; /* blocks per page */
170 short l2nbperpage; /* log2 blocks per page */
171 short l2niperblk; /* log2 inodes per page */
172 dev_t logdev; /* external log device */
173 uint aggregate; /* volume identifier in log record */
174 pxd_t logpxd; /* pxd describing log */
175 pxd_t fsckpxd; /* pxd describing fsck wkspc */
176 pxd_t ait2; /* pxd describing AIT copy */
177 char uuid[16]; /* 128-bit uuid for volume */
178 char loguuid[16]; /* 128-bit uuid for log */
179 /*
180 * commit_state is used for synchronization of the jfs_commit
181 * threads. It is protected by LAZY_LOCK().
182 */
183 int commit_state; /* commit state */
184 /* Formerly in ipimap */
185 uint gengen; /* inode generation generator*/
186 uint inostamp; /* shows inode belongs to fileset*/
187
188 /* Formerly in ipbmap */
189 struct bmap *bmap; /* incore bmap descriptor */
190 struct nls_table *nls_tab; /* current codepage */
191 struct inode *direct_inode; /* metadata inode */
192 uint state; /* mount/recovery state */
193 unsigned long flag; /* mount time flags */
194 uint p_state; /* state prior to going no integrity */
195 uint uid; /* uid to override on-disk uid */
196 uint gid; /* gid to override on-disk gid */
197 uint umask; /* umask to override on-disk umask */
198 };
199
200 /* jfs_sb_info commit_state */
201 #define IN_LAZYCOMMIT 1
202
JFS_IP(struct inode * inode)203 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
204 {
205 return list_entry(inode, struct jfs_inode_info, vfs_inode);
206 }
207
jfs_dirtable_inline(struct inode * inode)208 static inline int jfs_dirtable_inline(struct inode *inode)
209 {
210 return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
211 }
212
JFS_SBI(struct super_block * sb)213 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
214 {
215 return sb->s_fs_info;
216 }
217
isReadOnly(struct inode * inode)218 static inline int isReadOnly(struct inode *inode)
219 {
220 if (JFS_SBI(inode->i_sb)->log)
221 return 0;
222 return 1;
223 }
224 #endif /* _H_JFS_INCORE */
225