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