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 unsigned int s_inodes_per_block; /* number of inodes per block */ 28 unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */ 29 unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */ 30 unsigned int s_ind_per_block; /* number of indirections per block */ 31 unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */ 32 unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */ 33 unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */ 34 unsigned int s_block_base; /* physical block number of block 0 */ 35 unsigned short s_fic_size; /* free inode cache size, NICINOD */ 36 unsigned short s_flc_size; /* free block list chunk size, NICFREE */ 37 /* The superblock is kept in one or two disk buffers: */ 38 struct buffer_head *s_bh1; 39 struct buffer_head *s_bh2; 40 /* These are pointers into the disk buffer, to compensate for 41 different superblock layout. */ 42 char * s_sbd1; /* entire superblock data, for part 1 */ 43 char * s_sbd2; /* entire superblock data, for part 2 */ 44 __fs16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */ 45 sysv_ino_t *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */ 46 __fs16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */ 47 __fs16 *s_bcache_count; /* pointer to s_sbd->s_nfree */ 48 sysv_zone_t *s_bcache; /* pointer to s_sbd->s_free */ 49 __fs32 *s_free_blocks; /* pointer to s_sbd->s_tfree */ 50 __fs32 *s_sb_time; /* pointer to s_sbd->s_time */ 51 __fs32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */ 52 /* We keep those superblock entities that don't change here; 53 this saves us an indirection and perhaps a conversion. */ 54 u32 s_firstinodezone; /* index of first inode zone */ 55 u32 s_firstdatazone; /* same as s_sbd->s_isize */ 56 u32 s_ninodes; /* total number of inodes */ 57 u32 s_ndatazones; /* total number of data zones */ 58 u32 s_nzones; /* same as s_sbd->s_fsize */ 59 u16 s_namelen; /* max length of dir entry */ 60 int s_forced_ro; 61 struct mutex s_lock; 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 container_of(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 } 122 123 124 /* ialloc.c */ 125 extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned, 126 struct buffer_head **); 127 extern struct inode * sysv_new_inode(const struct inode *, umode_t); 128 extern void sysv_free_inode(struct inode *); 129 extern unsigned long sysv_count_free_inodes(struct super_block *); 130 131 /* balloc.c */ 132 extern sysv_zone_t sysv_new_block(struct super_block *); 133 extern void sysv_free_block(struct super_block *, sysv_zone_t); 134 extern unsigned long sysv_count_free_blocks(struct super_block *); 135 136 /* itree.c */ 137 extern void sysv_truncate(struct inode *); 138 extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len); 139 140 /* inode.c */ 141 extern struct inode *sysv_iget(struct super_block *, unsigned int); 142 extern int sysv_write_inode(struct inode *, struct writeback_control *wbc); 143 extern int sysv_sync_inode(struct inode *); 144 extern void sysv_set_inode(struct inode *, dev_t); 145 extern int sysv_getattr(struct vfsmount *, struct dentry *, struct kstat *); 146 extern int sysv_init_icache(void); 147 extern void sysv_destroy_icache(void); 148 149 150 /* dir.c */ 151 extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **); 152 extern int sysv_add_link(struct dentry *, struct inode *); 153 extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *); 154 extern int sysv_make_empty(struct inode *, struct inode *); 155 extern int sysv_empty_dir(struct inode *); 156 extern void sysv_set_link(struct sysv_dir_entry *, struct page *, 157 struct inode *); 158 extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **); 159 extern ino_t sysv_inode_by_name(struct dentry *); 160 161 162 extern const struct inode_operations sysv_file_inode_operations; 163 extern const struct inode_operations sysv_dir_inode_operations; 164 extern const struct file_operations sysv_file_operations; 165 extern const struct file_operations sysv_dir_operations; 166 extern const struct address_space_operations sysv_aops; 167 extern const struct super_operations sysv_sops; 168 extern const struct dentry_operations sysv_dentry_operations; 169 170 171 enum { 172 BYTESEX_LE, 173 BYTESEX_PDP, 174 BYTESEX_BE, 175 }; 176 177 static inline u32 PDP_swab(u32 x) 178 { 179 #ifdef __LITTLE_ENDIAN 180 return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); 181 #else 182 #ifdef __BIG_ENDIAN 183 return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8); 184 #else 185 #error BYTESEX 186 #endif 187 #endif 188 } 189 190 static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n) 191 { 192 if (sbi->s_bytesex == BYTESEX_PDP) 193 return PDP_swab((__force __u32)n); 194 else if (sbi->s_bytesex == BYTESEX_LE) 195 return le32_to_cpu((__force __le32)n); 196 else 197 return be32_to_cpu((__force __be32)n); 198 } 199 200 static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n) 201 { 202 if (sbi->s_bytesex == BYTESEX_PDP) 203 return (__force __fs32)PDP_swab(n); 204 else if (sbi->s_bytesex == BYTESEX_LE) 205 return (__force __fs32)cpu_to_le32(n); 206 else 207 return (__force __fs32)cpu_to_be32(n); 208 } 209 210 static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d) 211 { 212 if (sbi->s_bytesex == BYTESEX_PDP) 213 *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d); 214 else if (sbi->s_bytesex == BYTESEX_LE) 215 le32_add_cpu((__le32 *)n, d); 216 else 217 be32_add_cpu((__be32 *)n, d); 218 return *n; 219 } 220 221 static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n) 222 { 223 if (sbi->s_bytesex != BYTESEX_BE) 224 return le16_to_cpu((__force __le16)n); 225 else 226 return be16_to_cpu((__force __be16)n); 227 } 228 229 static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n) 230 { 231 if (sbi->s_bytesex != BYTESEX_BE) 232 return (__force __fs16)cpu_to_le16(n); 233 else 234 return (__force __fs16)cpu_to_be16(n); 235 } 236 237 static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d) 238 { 239 if (sbi->s_bytesex != BYTESEX_BE) 240 le16_add_cpu((__le16 *)n, d); 241 else 242 be16_add_cpu((__be16 *)n, d); 243 return *n; 244 } 245 246 #endif /* _SYSV_H */ 247