Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 140 | /* inode.c */ |
| 141 | extern int sysv_write_inode(struct inode *, int); |
| 142 | extern int sysv_sync_inode(struct inode *); |
| 143 | extern int sysv_sync_file(struct file *, struct dentry *, int); |
| 144 | extern void sysv_set_inode(struct inode *, dev_t); |
| 145 | extern int sysv_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
| 146 | |
| 147 | /* dir.c */ |
| 148 | extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **); |
| 149 | extern int sysv_add_link(struct dentry *, struct inode *); |
| 150 | extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *); |
| 151 | extern int sysv_make_empty(struct inode *, struct inode *); |
| 152 | extern int sysv_empty_dir(struct inode *); |
| 153 | extern void sysv_set_link(struct sysv_dir_entry *, struct page *, |
| 154 | struct inode *); |
| 155 | extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **); |
| 156 | extern ino_t sysv_inode_by_name(struct dentry *); |
| 157 | |
| 158 | |
| 159 | extern struct inode_operations sysv_file_inode_operations; |
| 160 | extern struct inode_operations sysv_dir_inode_operations; |
| 161 | extern struct inode_operations sysv_fast_symlink_inode_operations; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 162 | extern const struct file_operations sysv_file_operations; |
| 163 | extern const struct file_operations sysv_dir_operations; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 164 | extern const struct address_space_operations sysv_aops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | extern struct super_operations sysv_sops; |
| 166 | extern struct dentry_operations sysv_dentry_operations; |
| 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) |
| 213 | *(__le32*)n = cpu_to_le32(le32_to_cpu(*(__le32*)n)+d); |
| 214 | else |
| 215 | *(__be32*)n = cpu_to_be32(be32_to_cpu(*(__be32*)n)+d); |
| 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) |
| 238 | *(__le16*)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)+d); |
| 239 | else |
| 240 | *(__be16*)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)+d); |
| 241 | return *n; |
| 242 | } |
| 243 | |
| 244 | #endif /* _SYSV_H */ |