4 #include <linux/buffer_head.h>
5 #include <linux/sysv_fs.h>
8 * SystemV/V7/Coherent super-block data in memory
10 * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
11 * while the system is running). This is in contrast to the Minix and Berkeley
12 * filesystems (where the superblock is never modified). This affects the
13 * sync() operation: we must keep the superblock in a disk buffer and use this
14 * one as our "working copy".
18 struct super_block *s_sb; /* VFS superblock */
19 int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
20 char s_bytesex; /* bytesex (le/be/pdp) */
21 char s_truncate; /* if 1: names > SYSV_NAMELEN chars are truncated */
22 /* if 0: they are disallowed (ENAMETOOLONG) */
23 nlink_t s_link_max; /* max number of hard links to a file */
24 unsigned int s_inodes_per_block; /* number of inodes per block */
25 unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
26 unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
27 unsigned int s_ind_per_block; /* number of indirections per block */
28 unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */
29 unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */
30 unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */
31 unsigned int s_block_base; /* physical block number of block 0 */
32 unsigned short s_fic_size; /* free inode cache size, NICINOD */
33 unsigned short s_flc_size; /* free block list chunk size, NICFREE */
34 /* The superblock is kept in one or two disk buffers: */
35 struct buffer_head *s_bh1;
36 struct buffer_head *s_bh2;
37 /* These are pointers into the disk buffer, to compensate for
38 different superblock layout. */
39 char * s_sbd1; /* entire superblock data, for part 1 */
40 char * s_sbd2; /* entire superblock data, for part 2 */
41 u16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
42 u16 *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
43 u16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
44 u16 *s_bcache_count; /* pointer to s_sbd->s_nfree */
45 u32 *s_bcache; /* pointer to s_sbd->s_free */
46 u32 *s_free_blocks; /* pointer to s_sbd->s_tfree */
47 u32 *s_sb_time; /* pointer to s_sbd->s_time */
48 u32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
49 /* We keep those superblock entities that don't change here;
50 this saves us an indirection and perhaps a conversion. */
51 u32 s_firstinodezone; /* index of first inode zone */
52 u32 s_firstdatazone; /* same as s_sbd->s_isize */
53 u32 s_ninodes; /* total number of inodes */
54 u32 s_ndatazones; /* total number of data zones */
55 u32 s_nzones; /* same as s_sbd->s_fsize */
56 u16 s_namelen; /* max length of dir entry */
61 * SystemV/V7/Coherent FS inode data in memory
63 struct sysv_inode_info {
65 u32 i_dir_start_lookup;
66 struct inode vfs_inode;
70 static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
72 return list_entry(inode, struct sysv_inode_info, vfs_inode);
75 static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
81 /* identify the FS in memory */
93 #define SYSV_MAGIC_BASE 0x012FF7B3
95 #define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX)
96 #define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
97 #define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
98 #define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH)
101 /* Admissible values for i_nlink: 0.._LINK_MAX */
103 XENIX_LINK_MAX = 126, /* ?? */
104 SYSV_LINK_MAX = 126, /* 127? 251? */
105 V7_LINK_MAX = 126, /* ?? */
106 COH_LINK_MAX = 10000,
110 static inline void dirty_sb(struct super_block *sb)
112 struct sysv_sb_info *sbi = SYSV_SB(sb);
114 mark_buffer_dirty(sbi->s_bh1);
115 if (sbi->s_bh1 != sbi->s_bh2)
116 mark_buffer_dirty(sbi->s_bh2);
122 extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
123 struct buffer_head **);
124 extern struct inode * sysv_new_inode(const struct inode *, mode_t);
125 extern void sysv_free_inode(struct inode *);
126 extern unsigned long sysv_count_free_inodes(struct super_block *);
129 extern u32 sysv_new_block(struct super_block *);
130 extern void sysv_free_block(struct super_block *, u32);
131 extern unsigned long sysv_count_free_blocks(struct super_block *);
134 extern void sysv_truncate(struct inode *);
137 extern void sysv_write_inode(struct inode *, int);
138 extern int sysv_sync_inode(struct inode *);
139 extern int sysv_sync_file(struct file *, struct dentry *, int);
140 extern void sysv_set_inode(struct inode *, dev_t);
141 extern int sysv_getattr(struct vfsmount *, struct dentry *, struct kstat *);
144 extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
145 extern int sysv_add_link(struct dentry *, struct inode *);
146 extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
147 extern int sysv_make_empty(struct inode *, struct inode *);
148 extern int sysv_empty_dir(struct inode *);
149 extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
151 extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
152 extern ino_t sysv_inode_by_name(struct dentry *);
155 extern struct inode_operations sysv_file_inode_operations;
156 extern struct inode_operations sysv_dir_inode_operations;
157 extern struct inode_operations sysv_fast_symlink_inode_operations;
158 extern struct file_operations sysv_file_operations;
159 extern struct file_operations sysv_dir_operations;
160 extern struct address_space_operations sysv_aops;
161 extern struct super_operations sysv_sops;
162 extern struct dentry_operations sysv_dentry_operations;
171 static inline u32 PDP_swab(u32 x)
173 #ifdef __LITTLE_ENDIAN
174 return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
177 return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
184 static inline u32 fs32_to_cpu(struct sysv_sb_info *sbi, u32 n)
186 if (sbi->s_bytesex == BYTESEX_PDP)
188 else if (sbi->s_bytesex == BYTESEX_LE)
189 return le32_to_cpu(n);
191 return be32_to_cpu(n);
194 static inline u32 cpu_to_fs32(struct sysv_sb_info *sbi, u32 n)
196 if (sbi->s_bytesex == BYTESEX_PDP)
198 else if (sbi->s_bytesex == BYTESEX_LE)
199 return cpu_to_le32(n);
201 return cpu_to_be32(n);
204 static inline u32 fs32_add(struct sysv_sb_info *sbi, u32 *n, int d)
206 if (sbi->s_bytesex == BYTESEX_PDP)
207 return *n = PDP_swab(PDP_swab(*n)+d);
208 else if (sbi->s_bytesex == BYTESEX_LE)
209 return *n = cpu_to_le32(le32_to_cpu(*n)+d);
211 return *n = cpu_to_be32(be32_to_cpu(*n)+d);
214 static inline u16 fs16_to_cpu(struct sysv_sb_info *sbi, u16 n)
216 if (sbi->s_bytesex != BYTESEX_BE)
217 return le16_to_cpu(n);
219 return be16_to_cpu(n);
222 static inline u16 cpu_to_fs16(struct sysv_sb_info *sbi, u16 n)
224 if (sbi->s_bytesex != BYTESEX_BE)
225 return cpu_to_le16(n);
227 return cpu_to_be16(n);
230 static inline u16 fs16_add(struct sysv_sb_info *sbi, u16 *n, int d)
232 if (sbi->s_bytesex != BYTESEX_BE)
233 return *n = cpu_to_le16(le16_to_cpu(*n)+d);
235 return *n = cpu_to_be16(be16_to_cpu(*n)+d);