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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _SYSV_H |
3 | #define _SYSV_H | |
4 | ||
5 | #include <linux/buffer_head.h> | |
6 | ||
7 | typedef __u16 __bitwise __fs16; | |
8 | typedef __u32 __bitwise __fs32; | |
9 | ||
10 | #include <linux/sysv_fs.h> | |
11 | ||
12 | /* | |
13 | * SystemV/V7/Coherent super-block data in memory | |
14 | * | |
15 | * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified | |
16 | * while the system is running). This is in contrast to the Minix and Berkeley | |
17 | * filesystems (where the superblock is never modified). This affects the | |
18 | * sync() operation: we must keep the superblock in a disk buffer and use this | |
19 | * one as our "working copy". | |
20 | */ | |
21 | ||
22 | struct sysv_sb_info { | |
23 | struct super_block *s_sb; /* VFS superblock */ | |
24 | int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */ | |
25 | char s_bytesex; /* bytesex (le/be/pdp) */ | |
1da177e4 LT |
26 | unsigned int s_inodes_per_block; /* number of inodes per block */ |
27 | unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */ | |
28 | unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */ | |
29 | unsigned int s_ind_per_block; /* number of indirections per block */ | |
30 | unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */ | |
31 | unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */ | |
32 | unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */ | |
33 | unsigned int s_block_base; /* physical block number of block 0 */ | |
34 | unsigned short s_fic_size; /* free inode cache size, NICINOD */ | |
35 | unsigned short s_flc_size; /* free block list chunk size, NICFREE */ | |
36 | /* The superblock is kept in one or two disk buffers: */ | |
37 | struct buffer_head *s_bh1; | |
38 | struct buffer_head *s_bh2; | |
39 | /* These are pointers into the disk buffer, to compensate for | |
40 | different superblock layout. */ | |
41 | char * s_sbd1; /* entire superblock data, for part 1 */ | |
42 | char * s_sbd2; /* entire superblock data, for part 2 */ | |
43 | __fs16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */ | |
44 | sysv_ino_t *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */ | |
45 | __fs16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */ | |
46 | __fs16 *s_bcache_count; /* pointer to s_sbd->s_nfree */ | |
47 | sysv_zone_t *s_bcache; /* pointer to s_sbd->s_free */ | |
48 | __fs32 *s_free_blocks; /* pointer to s_sbd->s_tfree */ | |
49 | __fs32 *s_sb_time; /* pointer to s_sbd->s_time */ | |
50 | __fs32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */ | |
51 | /* We keep those superblock entities that don't change here; | |
52 | this saves us an indirection and perhaps a conversion. */ | |
53 | u32 s_firstinodezone; /* index of first inode zone */ | |
54 | u32 s_firstdatazone; /* same as s_sbd->s_isize */ | |
55 | u32 s_ninodes; /* total number of inodes */ | |
56 | u32 s_ndatazones; /* total number of data zones */ | |
57 | u32 s_nzones; /* same as s_sbd->s_fsize */ | |
58 | u16 s_namelen; /* max length of dir entry */ | |
59 | int s_forced_ro; | |
c07cb01c | 60 | struct mutex s_lock; |
1da177e4 LT |
61 | }; |
62 | ||
63 | /* | |
64 | * SystemV/V7/Coherent FS inode data in memory | |
65 | */ | |
66 | struct sysv_inode_info { | |
67 | __fs32 i_data[13]; | |
68 | u32 i_dir_start_lookup; | |
69 | struct inode vfs_inode; | |
70 | }; | |
71 | ||
72 | ||
73 | static inline struct sysv_inode_info *SYSV_I(struct inode *inode) | |
74 | { | |
db6172c4 | 75 | return container_of(inode, struct sysv_inode_info, vfs_inode); |
1da177e4 LT |
76 | } |
77 | ||
78 | static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb) | |
79 | { | |
80 | return sb->s_fs_info; | |
81 | } | |
82 | ||
83 | ||
84 | /* identify the FS in memory */ | |
85 | enum { | |
86 | FSTYPE_NONE = 0, | |
87 | FSTYPE_XENIX, | |
88 | FSTYPE_SYSV4, | |
89 | FSTYPE_SYSV2, | |
90 | FSTYPE_COH, | |
91 | FSTYPE_V7, | |
92 | FSTYPE_AFS, | |
93 | FSTYPE_END, | |
94 | }; | |
95 | ||
96 | #define SYSV_MAGIC_BASE 0x012FF7B3 | |
97 | ||
98 | #define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX) | |
99 | #define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4) | |
100 | #define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2) | |
101 | #define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH) | |
102 | ||
103 | ||
104 | /* Admissible values for i_nlink: 0.._LINK_MAX */ | |
105 | enum { | |
106 | XENIX_LINK_MAX = 126, /* ?? */ | |
107 | SYSV_LINK_MAX = 126, /* 127? 251? */ | |
108 | V7_LINK_MAX = 126, /* ?? */ | |
109 | COH_LINK_MAX = 10000, | |
110 | }; | |
111 | ||
112 | ||
113 | static inline void dirty_sb(struct super_block *sb) | |
114 | { | |
115 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
116 | ||
117 | mark_buffer_dirty(sbi->s_bh1); | |
118 | if (sbi->s_bh1 != sbi->s_bh2) | |
119 | mark_buffer_dirty(sbi->s_bh2); | |
1da177e4 LT |
120 | } |
121 | ||
122 | ||
123 | /* ialloc.c */ | |
124 | extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned, | |
125 | struct buffer_head **); | |
dd716e64 | 126 | extern struct inode * sysv_new_inode(const struct inode *, umode_t); |
1da177e4 LT |
127 | extern void sysv_free_inode(struct inode *); |
128 | extern unsigned long sysv_count_free_inodes(struct super_block *); | |
129 | ||
130 | /* balloc.c */ | |
131 | extern sysv_zone_t sysv_new_block(struct super_block *); | |
132 | extern void sysv_free_block(struct super_block *, sysv_zone_t); | |
133 | extern unsigned long sysv_count_free_blocks(struct super_block *); | |
134 | ||
135 | /* itree.c */ | |
136 | extern void sysv_truncate(struct inode *); | |
f4e420dc | 137 | extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len); |
1da177e4 LT |
138 | |
139 | /* inode.c */ | |
b8e1343f | 140 | extern struct inode *sysv_iget(struct super_block *, unsigned int); |
a9185b41 | 141 | extern int sysv_write_inode(struct inode *, struct writeback_control *wbc); |
1da177e4 | 142 | extern int sysv_sync_inode(struct inode *); |
1da177e4 | 143 | extern void sysv_set_inode(struct inode *, dev_t); |
a528d35e | 144 | extern int sysv_getattr(const struct path *, struct kstat *, u32, unsigned int); |
3b2b96ab AB |
145 | extern int sysv_init_icache(void); |
146 | extern void sysv_destroy_icache(void); | |
147 | ||
1da177e4 LT |
148 | |
149 | /* dir.c */ | |
150 | extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **); | |
151 | extern int sysv_add_link(struct dentry *, struct inode *); | |
152 | extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *); | |
153 | extern int sysv_make_empty(struct inode *, struct inode *); | |
154 | extern int sysv_empty_dir(struct inode *); | |
155 | extern void sysv_set_link(struct sysv_dir_entry *, struct page *, | |
156 | struct inode *); | |
157 | extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **); | |
158 | extern ino_t sysv_inode_by_name(struct dentry *); | |
159 | ||
160 | ||
c5ef1c42 AV |
161 | extern const struct inode_operations sysv_file_inode_operations; |
162 | extern const struct inode_operations sysv_dir_inode_operations; | |
4b6f5d20 AV |
163 | extern const struct file_operations sysv_file_operations; |
164 | extern const struct file_operations sysv_dir_operations; | |
f5e54d6e | 165 | extern const struct address_space_operations sysv_aops; |
ee9b6d61 | 166 | extern const struct super_operations sysv_sops; |
1da177e4 LT |
167 | |
168 | ||
169 | enum { | |
170 | BYTESEX_LE, | |
171 | BYTESEX_PDP, | |
172 | BYTESEX_BE, | |
173 | }; | |
174 | ||
175 | static inline u32 PDP_swab(u32 x) | |
176 | { | |
177 | #ifdef __LITTLE_ENDIAN | |
178 | return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); | |
179 | #else | |
180 | #ifdef __BIG_ENDIAN | |
181 | return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8); | |
182 | #else | |
183 | #error BYTESEX | |
184 | #endif | |
185 | #endif | |
186 | } | |
187 | ||
188 | static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n) | |
189 | { | |
190 | if (sbi->s_bytesex == BYTESEX_PDP) | |
191 | return PDP_swab((__force __u32)n); | |
192 | else if (sbi->s_bytesex == BYTESEX_LE) | |
193 | return le32_to_cpu((__force __le32)n); | |
194 | else | |
195 | return be32_to_cpu((__force __be32)n); | |
196 | } | |
197 | ||
198 | static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n) | |
199 | { | |
200 | if (sbi->s_bytesex == BYTESEX_PDP) | |
201 | return (__force __fs32)PDP_swab(n); | |
202 | else if (sbi->s_bytesex == BYTESEX_LE) | |
203 | return (__force __fs32)cpu_to_le32(n); | |
204 | else | |
205 | return (__force __fs32)cpu_to_be32(n); | |
206 | } | |
207 | ||
208 | static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d) | |
209 | { | |
210 | if (sbi->s_bytesex == BYTESEX_PDP) | |
211 | *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d); | |
212 | else if (sbi->s_bytesex == BYTESEX_LE) | |
07132922 | 213 | le32_add_cpu((__le32 *)n, d); |
1da177e4 | 214 | else |
07132922 | 215 | be32_add_cpu((__be32 *)n, d); |
1da177e4 LT |
216 | return *n; |
217 | } | |
218 | ||
219 | static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n) | |
220 | { | |
221 | if (sbi->s_bytesex != BYTESEX_BE) | |
222 | return le16_to_cpu((__force __le16)n); | |
223 | else | |
224 | return be16_to_cpu((__force __be16)n); | |
225 | } | |
226 | ||
227 | static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n) | |
228 | { | |
229 | if (sbi->s_bytesex != BYTESEX_BE) | |
230 | return (__force __fs16)cpu_to_le16(n); | |
231 | else | |
232 | return (__force __fs16)cpu_to_be16(n); | |
233 | } | |
234 | ||
235 | static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d) | |
236 | { | |
237 | if (sbi->s_bytesex != BYTESEX_BE) | |
07132922 | 238 | le16_add_cpu((__le16 *)n, d); |
1da177e4 | 239 | else |
07132922 | 240 | be16_add_cpu((__be16 *)n, d); |
1da177e4 LT |
241 | return *n; |
242 | } | |
243 | ||
244 | #endif /* _SYSV_H */ |