Root/fs/jfs/jfs_incore.h

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 */
38struct 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 */
117enum 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 */
130enum 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 */
143enum 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 */
158struct 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
203static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
204{
205    return list_entry(inode, struct jfs_inode_info, vfs_inode);
206}
207
208static inline int jfs_dirtable_inline(struct inode *inode)
209{
210    return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
211}
212
213static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
214{
215    return sb->s_fs_info;
216}
217
218static 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

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