2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
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.
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.
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
22 #include <linux/mutex.h>
23 #include <linux/rwsem.h>
24 #include <linux/slab.h>
25 #include <linux/bitops.h>
26 #include <linux/uuid.h>
28 #include "jfs_types.h"
29 #include "jfs_xtree.h"
30 #include "jfs_dtree.h"
35 #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
38 * JFS-private inode information
40 struct jfs_inode_info
{
41 int fileset
; /* fileset number (always 16)*/
42 uint mode2
; /* jfs-specific mode */
43 kuid_t saved_uid
; /* saved for uid mount option */
44 kgid_t saved_gid
; /* saved for gid mount option */
45 pxd_t ixpxd
; /* inode extent descriptor */
46 dxd_t acl
; /* dxd describing acl */
47 dxd_t ea
; /* dxd describing ea */
48 time64_t otime
; /* time created */
49 uint next_index
; /* next available directory entry index */
50 int acltype
; /* Type of ACL */
51 short btorder
; /* access order */
52 short btindex
; /* btpage entry index*/
53 struct inode
*ipimap
; /* inode map */
54 unsigned long cflag
; /* commit flags */
55 u64 agstart
; /* agstart of the containing IAG */
56 u16 bxflag
; /* xflag of pseudo buffer? */
58 signed char active_ag
; /* ag currently allocating from */
59 lid_t blid
; /* lid of pseudo buffer? */
60 lid_t atlhead
; /* anonymous tlock list head */
61 lid_t atltail
; /* anonymous tlock list tail */
62 spinlock_t ag_lock
; /* protects active_ag */
63 struct list_head anon_inode_list
; /* inodes having anonymous txns */
65 * rdwrlock serializes xtree between reads & writes and synchronizes
66 * changes to special inodes. It's use would be redundant on
67 * directories since the i_mutex taken in the VFS is sufficient.
69 struct rw_semaphore rdwrlock
;
71 * commit_mutex serializes transaction processing on an inode.
72 * It must be taken after beginning a transaction (txBegin), since
73 * dirty inodes may be committed while a new transaction on the
74 * inode is blocked in txBegin or TxBeginAnon
76 struct mutex commit_mutex
;
77 /* xattr_sem allows us to access the xattrs without taking i_mutex */
78 struct rw_semaphore xattr_sem
;
79 lid_t xtlid
; /* lid of xtree lock on directory */
82 xtpage_t _xtroot
; /* 288: xtree root */
83 struct inomap
*_imap
; /* 4: inode map header */
86 struct dir_table_slot _table
[12]; /* 96: dir index */
87 dtroot_t _dtroot
; /* 288: dtree root */
90 unchar _unused
[16]; /* 16: */
92 /* _inline may overflow into _inline_ea when needed */
93 unchar _inline
[128]; /* 128: inline symlink */
94 /* _inline_ea may overlay the last part of
95 * file._xtroot if maxentry = XTROOTINITSLOT
97 unchar _inline_ea
[128]; /* 128: inline extended attr */
101 struct dquot
*i_dquot
[MAXQUOTAS
];
103 u32 dev
; /* will die when we get wide dev_t */
104 struct inode vfs_inode
;
106 #define i_xtroot u.file._xtroot
107 #define i_imap u.file._imap
108 #define i_dirtable u.dir._table
109 #define i_dtroot u.dir._dtroot
110 #define i_inline u.link._inline
111 #define i_inline_ea u.link._inline_ea
113 #define IREAD_LOCK(ip, subclass) \
114 down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
115 #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock)
116 #define IWRITE_LOCK(ip, subclass) \
117 down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
118 #define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock)
124 COMMIT_Nolink
, /* inode committed with zero link count */
125 COMMIT_Inlineea
, /* commit inode inline EA */
126 COMMIT_Freewmap
, /* free WMAP at iClose() */
127 COMMIT_Dirty
, /* Inode is really dirty */
128 COMMIT_Dirtable
, /* commit changes to di_dirtable */
129 COMMIT_Stale
, /* data extent is no longer valid */
130 COMMIT_Synclist
, /* metadata pages on group commit synclist */
134 * commit_mutex nesting subclasses:
136 enum commit_mutex_class
140 COMMIT_MUTEX_SECOND_PARENT
, /* Renaming */
141 COMMIT_MUTEX_VICTIM
/* Inode being unlinked due to rename */
145 * rdwrlock subclasses:
146 * The dmap inode may be locked while a normal inode or the imap inode are
156 #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag))
157 #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag))
158 #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag))
159 #define test_and_clear_cflag(flag, ip) \
160 test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
162 * JFS-private superblock information.
165 struct super_block
*sb
; /* Point back to vfs super block */
166 unsigned long mntflag
; /* aggregate attributes */
167 struct inode
*ipbmap
; /* block map inode */
168 struct inode
*ipaimap
; /* aggregate inode map inode */
169 struct inode
*ipaimap2
; /* secondary aimap inode */
170 struct inode
*ipimap
; /* aggregate inode map inode */
171 struct jfs_log
*log
; /* log */
172 struct list_head log_list
; /* volumes associated with a journal */
173 short bsize
; /* logical block size */
174 short l2bsize
; /* log2 logical block size */
175 short nbperpage
; /* blocks per page */
176 short l2nbperpage
; /* log2 blocks per page */
177 short l2niperblk
; /* log2 inodes per page */
178 dev_t logdev
; /* external log device */
179 uint aggregate
; /* volume identifier in log record */
180 pxd_t logpxd
; /* pxd describing log */
181 pxd_t fsckpxd
; /* pxd describing fsck wkspc */
182 pxd_t ait2
; /* pxd describing AIT copy */
183 uuid_t uuid
; /* 128-bit uuid for volume */
184 uuid_t loguuid
; /* 128-bit uuid for log */
186 * commit_state is used for synchronization of the jfs_commit
187 * threads. It is protected by LAZY_LOCK().
189 int commit_state
; /* commit state */
190 /* Formerly in ipimap */
191 uint gengen
; /* inode generation generator*/
192 uint inostamp
; /* shows inode belongs to fileset*/
194 /* Formerly in ipbmap */
195 struct bmap
*bmap
; /* incore bmap descriptor */
196 struct nls_table
*nls_tab
; /* current codepage */
197 struct inode
*direct_inode
; /* metadata inode */
198 uint state
; /* mount/recovery state */
199 unsigned long flag
; /* mount time flags */
200 uint p_state
; /* state prior to going no integrity */
201 kuid_t uid
; /* uid to override on-disk uid */
202 kgid_t gid
; /* gid to override on-disk gid */
203 uint umask
; /* umask to override on-disk umask */
204 uint minblks_trim
; /* minimum blocks, for online trim */
207 /* jfs_sb_info commit_state */
208 #define IN_LAZYCOMMIT 1
210 static inline struct jfs_inode_info
*JFS_IP(struct inode
*inode
)
212 return container_of(inode
, struct jfs_inode_info
, vfs_inode
);
215 static inline int jfs_dirtable_inline(struct inode
*inode
)
217 return (JFS_IP(inode
)->next_index
<= (MAX_INLINE_DIRTABLE_ENTRY
+ 1));
220 static inline struct jfs_sb_info
*JFS_SBI(struct super_block
*sb
)
222 return sb
->s_fs_info
;
225 static inline int isReadOnly(struct inode
*inode
)
227 if (JFS_SBI(inode
->i_sb
)->log
)
231 #endif /* _H_JFS_INCORE */