diff options
Diffstat (limited to 'fs/sysv/sysv.h')
| -rw-r--r-- | fs/sysv/sysv.h | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h new file mode 100644 index 000000000..69d488986 --- /dev/null +++ b/fs/sysv/sysv.h @@ -0,0 +1,247 @@ +#ifndef _SYSV_H +#define _SYSV_H + +#include <linux/buffer_head.h> + +typedef __u16 __bitwise __fs16; +typedef __u32 __bitwise __fs32; + +#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) */ + 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 */ + __fs16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */ + sysv_ino_t *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */ + __fs16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */ + __fs16 *s_bcache_count; /* pointer to s_sbd->s_nfree */ + sysv_zone_t *s_bcache; /* pointer to s_sbd->s_free */ + __fs32 *s_free_blocks; /* pointer to s_sbd->s_tfree */ + __fs32 *s_sb_time; /* pointer to s_sbd->s_time */ + __fs32 *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; + struct mutex s_lock; +}; + +/* + * SystemV/V7/Coherent FS inode data in memory + */ +struct sysv_inode_info { + __fs32 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); +} + + +/* 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 *, umode_t); +extern void sysv_free_inode(struct inode *); +extern unsigned long sysv_count_free_inodes(struct super_block *); + +/* balloc.c */ +extern sysv_zone_t sysv_new_block(struct super_block *); +extern void sysv_free_block(struct super_block *, sysv_zone_t); +extern unsigned long sysv_count_free_blocks(struct super_block *); + +/* itree.c */ +extern void sysv_truncate(struct inode *); +extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len); + +/* inode.c */ +extern struct inode *sysv_iget(struct super_block *, unsigned int); +extern int sysv_write_inode(struct inode *, struct writeback_control *wbc); +extern int sysv_sync_inode(struct inode *); +extern void sysv_set_inode(struct inode *, dev_t); +extern int sysv_getattr(struct vfsmount *, struct dentry *, struct kstat *); +extern int sysv_init_icache(void); +extern void sysv_destroy_icache(void); + + +/* 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 const struct inode_operations sysv_file_inode_operations; +extern const struct inode_operations sysv_dir_inode_operations; +extern const struct inode_operations sysv_fast_symlink_inode_operations; +extern const struct file_operations sysv_file_operations; +extern const struct file_operations sysv_dir_operations; +extern const struct address_space_operations sysv_aops; +extern const struct super_operations sysv_sops; +extern const 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, __fs32 n) +{ + if (sbi->s_bytesex == BYTESEX_PDP) + return PDP_swab((__force __u32)n); + else if (sbi->s_bytesex == BYTESEX_LE) + return le32_to_cpu((__force __le32)n); + else + return be32_to_cpu((__force __be32)n); +} + +static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n) +{ + if (sbi->s_bytesex == BYTESEX_PDP) + return (__force __fs32)PDP_swab(n); + else if (sbi->s_bytesex == BYTESEX_LE) + return (__force __fs32)cpu_to_le32(n); + else + return (__force __fs32)cpu_to_be32(n); +} + +static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d) +{ + if (sbi->s_bytesex == BYTESEX_PDP) + *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d); + else if (sbi->s_bytesex == BYTESEX_LE) + le32_add_cpu((__le32 *)n, d); + else + be32_add_cpu((__be32 *)n, d); + return *n; +} + +static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n) +{ + if (sbi->s_bytesex != BYTESEX_BE) + return le16_to_cpu((__force __le16)n); + else + return be16_to_cpu((__force __be16)n); +} + +static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n) +{ + if (sbi->s_bytesex != BYTESEX_BE) + return (__force __fs16)cpu_to_le16(n); + else + return (__force __fs16)cpu_to_be16(n); +} + +static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d) +{ + if (sbi->s_bytesex != BYTESEX_BE) + le16_add_cpu((__le16 *)n, d); + else + be16_add_cpu((__be16 *)n, d); + return *n; +} + +#endif /* _SYSV_H */ |