ia64/linux-2.6.18-xen.hg

view fs/jfs/jfs_incore.h @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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
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"
30 /*
31 * JFS magic number
32 */
33 #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
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
110 #define JFS_ACL_NOT_CACHED ((void *)-1)
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)
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 };
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*/
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 };
180 /* jfs_sb_info commit_state */
181 #define IN_LAZYCOMMIT 1
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 }
188 static inline int jfs_dirtable_inline(struct inode *inode)
189 {
190 return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
191 }
193 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
194 {
195 return sb->s_fs_info;
196 }
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 */