1 #ifndef _SYSV_H
2 #define _SYSV_H
3
4 #include <linux/buffer_head.h>
5
6 typedef __u16 __bitwise __fs16;
7 typedef __u32 __bitwise __fs32;
8
9 #include <linux/sysv_fs.h>
10
11 /*
12 * SystemV/V7/Coherent super-block data in memory
13 *
14 * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
15 * while the system is running). This is in contrast to the Minix and Berkeley
16 * filesystems (where the superblock is never modified). This affects the
17 * sync() operation: we must keep the superblock in a disk buffer and use this
18 * one as our "working copy".
19 */
20
21 struct sysv_sb_info {
22 struct super_block *s_sb; /* VFS superblock */
23 int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
24 char s_bytesex; /* bytesex (le/be/pdp) */
25 char s_truncate; /* if 1: names > SYSV_NAMELEN chars are truncated */
26 /* if 0: they are disallowed (ENAMETOOLONG) */
27 nlink_t s_link_max; /* max number of hard links to a file */
28 unsigned int s_inodes_per_block; /* number of inodes per block */
29 unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
30 unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
31 unsigned int s_ind_per_block; /* number of indirections per block */
32 unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */
33 unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */
34 unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */
35 unsigned int s_block_base; /* physical block number of block 0 */
36 unsigned short s_fic_size; /* free inode cache size, NICINOD */
37 unsigned short s_flc_size; /* free block list chunk size, NICFREE */
38 /* The superblock is kept in one or two disk buffers: */
39 struct buffer_head *s_bh1;
40 struct buffer_head *s_bh2;
41 /* These are pointers into the disk buffer, to compensate for
42 different superblock layout. */
43 char * s_sbd1; /* entire superblock data, for part 1 */
44 char * s_sbd2; /* entire superblock data, for part 2 */
45 __fs16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
46 sysv_ino_t *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
47 __fs16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
48 __fs16 *s_bcache_count; /* pointer to s_sbd->s_nfree */
49 sysv_zone_t *s_bcache; /* pointer to s_sbd->s_free */
50 __fs32 *s_free_blocks; /* pointer to s_sbd->s_tfree */
51 __fs32 *s_sb_time; /* pointer to s_sbd->s_time */
52 __fs32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
53 /* We keep those superblock entities that don't change here;
54 this saves us an indirection and perhaps a conversion. */
55 u32 s_firstinodezone; /* index of first inode zone */
56 u32 s_firstdatazone; /* same as s_sbd->s_isize */
57 u32 s_ninodes; /* total number of inodes */
58 u32 s_ndatazones; /* total number of data zones */
59 u32 s_nzones; /* same as s_sbd->s_fsize */
60 u16 s_namelen; /* max length of dir entry */
61 int s_forced_ro;
62 };
63
64 /*
65 * SystemV/V7/Coherent FS inode data in memory
66 */
67 struct sysv_inode_info {
68 __fs32 i_data[13];
69 u32 i_dir_start_lookup;
70 struct inode vfs_inode;
71 };
72
73
74 static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
75 {
76 return list_entry(inode, struct sysv_inode_info, vfs_inode);
77 }
78
79 static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
80 {
81 return sb->s_fs_info;
82 }
83
84
85 /* identify the FS in memory */
86 enum {
87 FSTYPE_NONE = 0,
88 FSTYPE_XENIX,
89 FSTYPE_SYSV4,
90 FSTYPE_SYSV2,
91 FSTYPE_COH,
92 FSTYPE_V7,
93 FSTYPE_AFS,
94 FSTYPE_END,
95 };
96
97 #define SYSV_MAGIC_BASE 0x012FF7B3
98
99 #define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX)
100 #define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
101 #define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
102 #define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH)
103
104
105 /* Admissible values for i_nlink: 0.._LINK_MAX */
106 enum {
107 XENIX_LINK_MAX = 126, /* ?? */
108 SYSV_LINK_MAX = 126, /* 127? 251? */
109 V7_LINK_MAX = 126, /* ?? */
110 COH_LINK_MAX = 10000,
111 };
112
113
114 static inline void dirty_sb(struct super_block *sb)
115 {
116 struct sysv_sb_info *sbi = SYSV_SB(sb);
117
118 mark_buffer_dirty(sbi->s_bh1);
119 if (sbi->s_bh1 != sbi->s_bh2)
120 mark_buffer_dirty(sbi->s_bh2);
121 sb->s_dirt = 1;
122 }
123
124
125 /* ialloc.c */
126 extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
127 struct buffer_head **);
128 extern struct inode * sysv_new_inode(const struct inode *, mode_t);
129 extern void sysv_free_inode(struct inode *);
130 extern unsigned long sysv_count_free_inodes(struct super_block *);
131
132 /* balloc.c */
133 extern sysv_zone_t sysv_new_block(struct super_block *);
134 extern void sysv_free_block(struct super_block *, sysv_zone_t);
135 extern unsigned long sysv_count_free_blocks(struct super_block *);
136
137 /* itree.c */
138 extern void sysv_truncate(struct inode *);
139 extern int __sysv_write_begin(struct file *file, struct address_space *mapping,
140 loff_t pos, unsigned len, unsigned flags,
141 struct page **pagep, void **fsdata);
142
143 /* inode.c */
144 extern struct inode *sysv_iget(struct super_block *, unsigned int);
145 extern int sysv_write_inode(struct inode *, int);
146 extern int sysv_sync_inode(struct inode *);
147 extern void sysv_set_inode(struct inode *, dev_t);
148 extern int sysv_getattr(struct vfsmount *, struct dentry *, struct kstat *);
149 extern int sysv_init_icache(void);
150 extern void sysv_destroy_icache(void);
151
152
153 /* dir.c */
154 extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
155 extern int sysv_add_link(struct dentry *, struct inode *);
156 extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
157 extern int sysv_make_empty(struct inode *, struct inode *);
158 extern int sysv_empty_dir(struct inode *);
159 extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
160 struct inode *);
161 extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
162 extern ino_t sysv_inode_by_name(struct dentry *);
163
164
165 extern const struct inode_operations sysv_file_inode_operations;
166 extern const struct inode_operations sysv_dir_inode_operations;
167 extern const struct inode_operations sysv_fast_symlink_inode_operations;
168 extern const struct file_operations sysv_file_operations;
169 extern const struct file_operations sysv_dir_operations;
170 extern const struct address_space_operations sysv_aops;
171 extern const struct super_operations sysv_sops;
172 extern const struct dentry_operations sysv_dentry_operations;
173
174
175 enum {
176 BYTESEX_LE,
177 BYTESEX_PDP,
178 BYTESEX_BE,
179 };
180
181 static inline u32 PDP_swab(u32 x)
182 {
183 #ifdef __LITTLE_ENDIAN
184 return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
185 #else
186 #ifdef __BIG_ENDIAN
187 return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
188 #else
189 #error BYTESEX
190 #endif
191 #endif
192 }
193
194 static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
195 {
196 if (sbi->s_bytesex == BYTESEX_PDP)
197 return PDP_swab((__force __u32)n);
198 else if (sbi->s_bytesex == BYTESEX_LE)
199 return le32_to_cpu((__force __le32)n);
200 else
201 return be32_to_cpu((__force __be32)n);
202 }
203
204 static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
205 {
206 if (sbi->s_bytesex == BYTESEX_PDP)
207 return (__force __fs32)PDP_swab(n);
208 else if (sbi->s_bytesex == BYTESEX_LE)
209 return (__force __fs32)cpu_to_le32(n);
210 else
211 return (__force __fs32)cpu_to_be32(n);
212 }
213
214 static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
215 {
216 if (sbi->s_bytesex == BYTESEX_PDP)
217 *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
218 else if (sbi->s_bytesex == BYTESEX_LE)
219 le32_add_cpu((__le32 *)n, d);
220 else
221 be32_add_cpu((__be32 *)n, d);
222 return *n;
223 }
224
225 static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
226 {
227 if (sbi->s_bytesex != BYTESEX_BE)
228 return le16_to_cpu((__force __le16)n);
229 else
230 return be16_to_cpu((__force __be16)n);
231 }
232
233 static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
234 {
235 if (sbi->s_bytesex != BYTESEX_BE)
236 return (__force __fs16)cpu_to_le16(n);
237 else
238 return (__force __fs16)cpu_to_be16(n);
239 }
240
241 static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
242 {
243 if (sbi->s_bytesex != BYTESEX_BE)
244 le16_add_cpu((__le16 *)n, d);
245 else
246 be16_add_cpu((__be16 *)n, d);
247 return *n;
248 }
249
250 #endif /* _SYSV_H */
251
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