1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) International Business Machines Corp., 2000-2004
4 * Portions Copyright (C) Christoph Hellwig, 2001-2002
5 */
6 #ifndef _H_JFS_INCORE
7 #define _H_JFS_INCORE
8
9 #include <linux/mutex.h>
10 #include <linux/rwsem.h>
11 #include <linux/slab.h>
12 #include <linux/bitops.h>
13 #include <linux/uuid.h>
14
15 #include "jfs_types.h"
16 #include "jfs_xtree.h"
17 #include "jfs_dtree.h"
18
19 /*
20 * JFS magic number
21 */
22 #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
23
24 /*
25 * JFS-private inode information
26 */
27 struct jfs_inode_info {
28 int fileset; /* fileset number (always 16)*/
29 uint mode2; /* jfs-specific mode */
30 kuid_t saved_uid; /* saved for uid mount option */
31 kgid_t saved_gid; /* saved for gid mount option */
32 pxd_t ixpxd; /* inode extent descriptor */
33 dxd_t acl; /* dxd describing acl */
34 dxd_t ea; /* dxd describing ea */
35 time64_t otime; /* time created */
36 uint next_index; /* next available directory entry index */
37 int acltype; /* Type of ACL */
38 short btorder; /* access order */
39 short btindex; /* btpage entry index*/
40 struct inode *ipimap; /* inode map */
41 unsigned long cflag; /* commit flags */
42 u64 agstart; /* agstart of the containing IAG */
43 u16 bxflag; /* xflag of pseudo buffer? */
44 unchar pad;
45 signed char active_ag; /* ag currently allocating from */
46 lid_t blid; /* lid of pseudo buffer? */
47 lid_t atlhead; /* anonymous tlock list head */
48 lid_t atltail; /* anonymous tlock list tail */
49 spinlock_t ag_lock; /* protects active_ag */
50 struct list_head anon_inode_list; /* inodes having anonymous txns */
51 /*
52 * rdwrlock serializes xtree between reads & writes and synchronizes
53 * changes to special inodes. It's use would be redundant on
54 * directories since the i_mutex taken in the VFS is sufficient.
55 */
56 struct rw_semaphore rdwrlock;
57 /*
58 * commit_mutex serializes transaction processing on an inode.
59 * It must be taken after beginning a transaction (txBegin), since
60 * dirty inodes may be committed while a new transaction on the
61 * inode is blocked in txBegin or TxBeginAnon
62 */
63 struct mutex commit_mutex;
64 /* xattr_sem allows us to access the xattrs without taking i_mutex */
65 struct rw_semaphore xattr_sem;
66 lid_t xtlid; /* lid of xtree lock on directory */
67 union {
68 struct {
69 xtroot_t _xtroot; /* 288: xtree root */
70 struct inomap *_imap; /* 4: inode map header */
71 } file;
72 struct {
73 struct dir_table_slot _table[12]; /* 96: dir index */
74 dtroot_t _dtroot; /* 288: dtree root */
75 } dir;
76 struct {
77 unchar _unused[16]; /* 16: */
78 dxd_t _dxd; /* 16: */
79 /* _inline may overflow into _inline_ea when needed */
80 /* _inline_ea may overlay the last part of
81 * file._xtroot if maxentry = XTROOTINITSLOT
82 */
83 union {
84 struct {
85 /* 128: inline symlink */
86 unchar _inline[128];
87 /* 128: inline extended attr */
88 unchar _inline_ea[128];
89 };
90 unchar _inline_all[256];
91 };
92 } link;
93 } u;
94 #ifdef CONFIG_QUOTA
95 struct dquot __rcu *i_dquot[MAXQUOTAS];
96 #endif
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 #define i_inline_all u.link._inline_all
107
108 #define IREAD_LOCK(ip, subclass) \
109 down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
110 #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock)
111 #define IWRITE_LOCK(ip, subclass) \
112 down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
113 #define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock)
114
115 /*
116 * cflag
117 */
118 enum cflags {
119 COMMIT_Nolink, /* inode committed with zero link count */
120 COMMIT_Inlineea, /* commit inode inline EA */
121 COMMIT_Freewmap, /* free WMAP at iClose() */
122 COMMIT_Dirty, /* Inode is really dirty */
123 COMMIT_Dirtable, /* commit changes to di_dirtable */
124 COMMIT_Stale, /* data extent is no longer valid */
125 COMMIT_Synclist, /* metadata pages on group commit synclist */
126 };
127
128 /*
129 * commit_mutex nesting subclasses:
130 */
131 enum commit_mutex_class
132 {
133 COMMIT_MUTEX_PARENT,
134 COMMIT_MUTEX_CHILD,
135 COMMIT_MUTEX_SECOND_PARENT, /* Renaming */
136 COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */
137 };
138
139 /*
140 * rdwrlock subclasses:
141 * The dmap inode may be locked while a normal inode or the imap inode are
142 * locked.
143 */
144 enum rdwrlock_class
145 {
146 RDWRLOCK_NORMAL,
147 RDWRLOCK_IMAP,
148 RDWRLOCK_DMAP
149 };
150
151 #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag))
152 #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag))
153 #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag))
154 #define test_and_clear_cflag(flag, ip) \
155 test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
156 /*
157 * JFS-private superblock information.
158 */
159 struct jfs_sb_info {
160 struct super_block *sb; /* Point back to vfs super block */
161 unsigned long mntflag; /* aggregate attributes */
162 struct inode *ipbmap; /* block map inode */
163 struct inode *ipaimap; /* aggregate inode map inode */
164 struct inode *ipaimap2; /* secondary aimap inode */
165 struct inode *ipimap; /* aggregate inode map inode */
166 struct jfs_log *log; /* log */
167 struct list_head log_list; /* volumes associated with a journal */
168 short bsize; /* logical block size */
169 short l2bsize; /* log2 logical block size */
170 short nbperpage; /* blocks per page */
171 short l2nbperpage; /* log2 blocks per page */
172 short l2niperblk; /* log2 inodes per page */
173 dev_t logdev; /* external log device */
174 uint aggregate; /* volume identifier in log record */
175 pxd_t logpxd; /* pxd describing log */
176 pxd_t fsckpxd; /* pxd describing fsck wkspc */
177 pxd_t ait2; /* pxd describing AIT copy */
178 uuid_t uuid; /* 128-bit uuid for volume */
179 uuid_t loguuid; /* 128-bit uuid for log */
180 /*
181 * commit_state is used for synchronization of the jfs_commit
182 * threads. It is protected by LAZY_LOCK().
183 */
184 int commit_state; /* commit state */
185 /* Formerly in ipimap */
186 uint gengen; /* inode generation generator*/
187 uint inostamp; /* shows inode belongs to fileset*/
188
189 /* Formerly in ipbmap */
190 struct bmap *bmap; /* incore bmap descriptor */
191 struct nls_table *nls_tab; /* current codepage */
192 struct inode *direct_inode; /* metadata inode */
193 uint state; /* mount/recovery state */
194 unsigned long flag; /* mount time flags */
195 uint p_state; /* state prior to going no integrity */
196 kuid_t uid; /* uid to override on-disk uid */
197 kgid_t gid; /* gid to override on-disk gid */
198 uint umask; /* umask to override on-disk umask */
199 uint minblks_trim; /* minimum blocks, for online trim */
200 };
201
202 /* jfs_sb_info commit_state */
203 #define IN_LAZYCOMMIT 1
204
205 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
206 {
207 return container_of(inode, struct jfs_inode_info, vfs_inode);
208 }
209
210 static inline int jfs_dirtable_inline(struct inode *inode)
211 {
212 return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
213 }
214
215 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
216 {
217 return sb->s_fs_info;
218 }
219
220 static inline int isReadOnly(struct inode *inode)
221 {
222 if (JFS_SBI(inode->i_sb)->log)
223 return 0;
224 return 1;
225 }
226 #endif /* _H_JFS_INCORE */
227
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