befs_fs.h
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上传日期:2013-04-10
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- /*
- * befs_fs.h
- *
- * Copyright (C) 2001-2002 Will Dyson <will_dyson@pobox.com>
- * Copyright (C) 1999 Makoto Kato (m_kato@ga2.so-net.ne.jp)
- */
- #ifndef _LINUX_BEFS_FS
- #define _LINUX_BEFS_FS
- #include "befs_fs_types.h"
- #include "compatibility.h"
- /* used in debug.c */
- #define BEFS_VERSION "0.9.2"
- typedef __u64 befs_blocknr_t;
- typedef __u32 vfs_blocknr_t;
- /*
- * BeFS in memory structures
- */
- typedef struct befs_mount_options {
- gid_t gid;
- uid_t uid;
- int use_gid;
- int use_uid;
- int debug;
- char *iocharset;
- } befs_mount_options;
- typedef struct befs_sb_info {
- __u32 magic1;
- __u32 block_size;
- __u32 block_shift;
- __u32 byte_order;
- befs_off_t num_blocks;
- befs_off_t used_blocks;
- __u32 inode_size;
- __u32 magic2;
- /* Allocation group information */
- __u32 blocks_per_ag;
- __u32 ag_shift;
- __u32 num_ags;
- /* jornal log entry */
- befs_block_run log_blocks;
- befs_off_t log_start;
- befs_off_t log_end;
- befs_inode_addr root_dir;
- befs_inode_addr indices;
- __u32 magic3;
- befs_mount_options mount_opts;
- struct nls_table *nls;
- } befs_sb_info;
- typedef struct befs_inode_info {
- __u32 i_flags;
- __u32 i_type;
- befs_inode_addr i_inode_num;
- befs_inode_addr i_parent;
- befs_inode_addr i_attribute;
- union {
- befs_data_stream ds;
- char symlink[BEFS_SYMLINK_LEN];
- } i_data;
- } befs_inode_info;
- enum befs_err {
- BEFS_OK,
- BEFS_ERR,
- BEFS_BAD_INODE,
- BEFS_BT_END,
- BEFS_BT_EMPTY,
- BEFS_BT_MATCH,
- BEFS_BT_PARMATCH,
- BEFS_BT_NOT_FOUND
- };
- /****************************/
- /* io.c */
- struct buffer_head *befs_bread_iaddr(struct super_block *sb,
- befs_inode_addr iaddr);
- struct buffer_head *befs_bread(struct super_block *sb, befs_blocknr_t block);
- /****************************/
- /****************************/
- /* datastream.c */
- struct buffer_head *befs_read_datastream(struct super_block *sb,
- befs_data_stream * ds, befs_off_t pos,
- uint * off);
- int befs_fblock2brun(struct super_block *sb, befs_data_stream * data,
- befs_blocknr_t fblock, befs_block_run * run);
- size_t befs_read_lsymlink(struct super_block *sb, befs_data_stream * data,
- void *buff, befs_off_t len);
- befs_blocknr_t befs_count_blocks(struct super_block *sb, befs_data_stream * ds);
- extern const befs_inode_addr BAD_IADDR;
- /****************************/
- /****************************/
- /* debug.c */
- void befs_error(const struct super_block *sb, const char *fmt, ...);
- void befs_warning(const struct super_block *sb, const char *fmt, ...);
- void befs_debug(const struct super_block *sb, const char *fmt, ...);
- void befs_dump_super_block(const struct super_block *sb, befs_super_block *);
- void befs_dump_inode(const struct super_block *sb, befs_inode *);
- void befs_dump_index_entry(const struct super_block *sb, befs_btree_super *);
- void befs_dump_index_node(const struct super_block *sb, befs_btree_nodehead *);
- void befs_dump_inode_addr(const struct super_block *sb, befs_inode_addr);
- /****************************/
- /****************************/
- /* btree.c */
- int befs_btree_find(struct super_block *sb, befs_data_stream * ds,
- const char *key, befs_off_t * value);
- int befs_btree_read(struct super_block *sb, befs_data_stream * ds,
- loff_t key_no, size_t bufsize, char *keybuf,
- size_t * keysize, befs_off_t * value);
- /****************************/
- /****************************/
- /* super.c */
- int befs_load_sb(struct super_block *sb, befs_super_block * disk_sb);
- int befs_check_sb(struct super_block *sb);
- /****************************/
- /****************************/
- /* inode.c */
- int befs_check_inode(struct super_block *sb, befs_inode * raw_inode,
- befs_blocknr_t inode);
- /****************************/
- /* Gets a pointer to the private portion of the super_block
- * structure from the public part
- */
- static inline befs_sb_info *
- BEFS_SB(const struct super_block *super)
- {
- return (befs_sb_info *) super->u.generic_sbp;
- }
- static inline befs_inode_info *
- BEFS_I(const struct inode *inode)
- {
- return (befs_inode_info *) inode->u.generic_ip;
- }
- static inline befs_blocknr_t
- iaddr2blockno(struct super_block *sb, befs_inode_addr * iaddr)
- {
- return ((iaddr->allocation_group << BEFS_SB(sb)->ag_shift) +
- iaddr->start);
- }
- static inline befs_inode_addr
- blockno2iaddr(struct super_block *sb, befs_blocknr_t blockno)
- {
- befs_inode_addr iaddr;
- iaddr.allocation_group = blockno >> BEFS_SB(sb)->ag_shift;
- iaddr.start =
- blockno - (iaddr.allocation_group << BEFS_SB(sb)->ag_shift);
- iaddr.len = 1;
- return iaddr;
- }
- static inline unsigned int
- befs_iaddrs_per_block(struct super_block *sb)
- {
- return BEFS_SB(sb)->block_size / sizeof (befs_inode_addr);
- }
- static inline int
- befs_iaddr_is_empty(befs_inode_addr * iaddr)
- {
- return (!iaddr->allocation_group) && (!iaddr->start) && (!iaddr->len);
- }
- static inline size_t
- befs_brun_size(struct super_block *sb, befs_block_run run)
- {
- return BEFS_SB(sb)->block_size * run.len;
- }
- #endif /* _LINUX_BEFS_FS */