xref: /linux/fs/jfs/jfs_incore.h (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
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 	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 #ifdef CONFIG_JFS_POSIX_ACL
78 	struct posix_acl *i_acl;
79 	struct posix_acl *i_default_acl;
80 #endif
81 	union {
82 		struct {
83 			xtpage_t _xtroot;	/* 288: xtree root */
84 			struct inomap *_imap;	/* 4: inode map header	*/
85 		} file;
86 		struct {
87 			struct dir_table_slot _table[12]; /* 96: dir index */
88 			dtroot_t _dtroot;	/* 288: dtree root */
89 		} dir;
90 		struct {
91 			unchar _unused[16];	/* 16: */
92 			dxd_t _dxd;		/* 16: */
93 			unchar _inline[128];	/* 128: inline symlink */
94 			/* _inline_ea may overlay the last part of
95 			 * file._xtroot if maxentry = XTROOTINITSLOT
96 			 */
97 			unchar _inline_ea[128];	/* 128: inline extended attr */
98 		} link;
99 	} u;
100 	u32 dev;	/* will die when we get wide dev_t */
101 	struct inode	vfs_inode;
102 };
103 #define i_xtroot u.file._xtroot
104 #define i_imap u.file._imap
105 #define i_dirtable u.dir._table
106 #define i_dtroot u.dir._dtroot
107 #define i_inline u.link._inline
108 #define i_inline_ea u.link._inline_ea
109 
110 #define JFS_ACL_NOT_CACHED ((void *)-1)
111 
112 #define IREAD_LOCK(ip)		down_read(&JFS_IP(ip)->rdwrlock)
113 #define IREAD_UNLOCK(ip)	up_read(&JFS_IP(ip)->rdwrlock)
114 #define IWRITE_LOCK(ip)		down_write(&JFS_IP(ip)->rdwrlock)
115 #define IWRITE_UNLOCK(ip)	up_write(&JFS_IP(ip)->rdwrlock)
116 
117 /*
118  * cflag
119  */
120 enum cflags {
121 	COMMIT_Nolink,		/* inode committed with zero link count */
122 	COMMIT_Inlineea,	/* commit inode inline EA */
123 	COMMIT_Freewmap,	/* free WMAP at iClose() */
124 	COMMIT_Dirty,		/* Inode is really dirty */
125 	COMMIT_Dirtable,	/* commit changes to di_dirtable */
126 	COMMIT_Stale,		/* data extent is no longer valid */
127 	COMMIT_Synclist,	/* metadata pages on group commit synclist */
128 };
129 
130 #define set_cflag(flag, ip)	set_bit(flag, &(JFS_IP(ip)->cflag))
131 #define clear_cflag(flag, ip)	clear_bit(flag, &(JFS_IP(ip)->cflag))
132 #define test_cflag(flag, ip)	test_bit(flag, &(JFS_IP(ip)->cflag))
133 #define test_and_clear_cflag(flag, ip) \
134 	test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
135 /*
136  * JFS-private superblock information.
137  */
138 struct jfs_sb_info {
139 	struct super_block *sb;		/* Point back to vfs super block */
140 	unsigned long	mntflag;	/* aggregate attributes	*/
141 	struct inode	*ipbmap;	/* block map inode		*/
142 	struct inode	*ipaimap;	/* aggregate inode map inode	*/
143 	struct inode	*ipaimap2;	/* secondary aimap inode	*/
144 	struct inode	*ipimap;	/* aggregate inode map inode	*/
145 	struct jfs_log	*log;		/* log			*/
146 	struct list_head log_list;	/* volumes associated with a journal */
147 	short		bsize;		/* logical block size	*/
148 	short		l2bsize;	/* log2 logical block size	*/
149 	short		nbperpage;	/* blocks per page		*/
150 	short		l2nbperpage;	/* log2 blocks per page	*/
151 	short		l2niperblk;	/* log2 inodes per page	*/
152 	dev_t		logdev;		/* external log device	*/
153 	uint		aggregate;	/* volume identifier in log record */
154 	pxd_t		logpxd;		/* pxd describing log	*/
155 	pxd_t		fsckpxd;	/* pxd describing fsck wkspc */
156 	pxd_t		ait2;		/* pxd describing AIT copy	*/
157 	char		uuid[16];	/* 128-bit uuid for volume	*/
158 	char		loguuid[16];	/* 128-bit uuid for log	*/
159 	/*
160 	 * commit_state is used for synchronization of the jfs_commit
161 	 * threads.  It is protected by LAZY_LOCK().
162 	 */
163 	int		commit_state;	/* commit state */
164 	/* Formerly in ipimap */
165 	uint		gengen;		/* inode generation generator*/
166 	uint		inostamp;	/* shows inode belongs to fileset*/
167 
168         /* Formerly in ipbmap */
169 	struct bmap	*bmap;		/* incore bmap descriptor	*/
170 	struct nls_table *nls_tab;	/* current codepage		*/
171 	struct inode *direct_inode;	/* metadata inode */
172 	uint		state;		/* mount/recovery state	*/
173 	unsigned long	flag;		/* mount time flags */
174 	uint		p_state;	/* state prior to going no integrity */
175 	uint		uid;		/* uid to override on-disk uid */
176 	uint		gid;		/* gid to override on-disk gid */
177 	uint		umask;		/* umask to override on-disk umask */
178 };
179 
180 /* jfs_sb_info commit_state */
181 #define IN_LAZYCOMMIT 1
182 
183 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
184 {
185 	return list_entry(inode, struct jfs_inode_info, vfs_inode);
186 }
187 
188 static inline int jfs_dirtable_inline(struct inode *inode)
189 {
190 	return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
191 }
192 
193 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
194 {
195 	return sb->s_fs_info;
196 }
197 
198 static inline int isReadOnly(struct inode *inode)
199 {
200 	if (JFS_SBI(inode->i_sb)->log)
201 		return 0;
202 	return 1;
203 }
204 #endif /* _H_JFS_INCORE */
205