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