ext4_fs.h

Axis 221 camera embedded programing interface

 * other bits are reserved for now.
 */
#define EXT4_FT_UNKNOWN		0
#define EXT4_FT_REG_FILE	1
#define EXT4_FT_DIR		2
#define EXT4_FT_CHRDEV		3
#define EXT4_FT_BLKDEV		4
#define EXT4_FT_FIFO		5
#define EXT4_FT_SOCK		6
#define EXT4_FT_SYMLINK		7

#define EXT4_FT_MAX		8

/*
 * EXT4_DIR_PAD defines the directory entries boundaries
 *
 * NOTE: It must be a multiple of 4
 */
#define EXT4_DIR_PAD			4
#define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
#define EXT4_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT4_DIR_ROUND) & \
					 ~EXT4_DIR_ROUND)
/*
 * Hash Tree Directory indexing
 * (c) Daniel Phillips, 2001
 */

#ifdef CONFIG_EXT4_INDEX
  #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
					      EXT4_FEATURE_COMPAT_DIR_INDEX) && \
		      (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
#else
  #define is_dx(dir) 0
#define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
#endif

/* Legal values for the dx_root hash_version field: */

#define DX_HASH_LEGACY		0
#define DX_HASH_HALF_MD4	1
#define DX_HASH_TEA		2

#ifdef __KERNEL__

/* hash info structure used by the directory hash */
struct dx_hash_info
{
	u32		hash;
	u32		minor_hash;
	int		hash_version;
	u32		*seed;
};

#define EXT4_HTREE_EOF	0x7fffffff

/*
 * Control parameters used by ext4_htree_next_block
 */
#define HASH_NB_ALWAYS		1


/*
 * Describe an inode's exact location on disk and in memory
 */
struct ext4_iloc
{
	struct buffer_head *bh;
	unsigned long offset;
	unsigned long block_group;
};

static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
{
	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
}

/*
 * This structure is stuffed into the struct file's private_data field
 * for directories.  It is where we put information so that we can do
 * readdir operations in hash tree order.
 */
struct dir_private_info {
	struct rb_root	root;
	struct rb_node	*curr_node;
	struct fname	*extra_fname;
	loff_t		last_pos;
	__u32		curr_hash;
	__u32		curr_minor_hash;
	__u32		next_hash;
};

/* calculate the first block number of the group */
static inline ext4_fsblk_t
ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
{
	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
}

/*
 * Special error return code only used by dx_probe() and its callers.
 */
#define ERR_BAD_DX_DIR	-75000

void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
			unsigned long *blockgrpp, ext4_grpblk_t *offsetp);

/*
 * Function prototypes
 */

/*
 * Ok, these declarations are also in <linux/kernel.h> but none of the
 * ext4 source programs needs to include it so they are duplicated here.
 */
# define NORET_TYPE    /**/
# define ATTRIB_NORET  __attribute__((noreturn))
# define NORET_AND     noreturn,

/* balloc.c */
extern unsigned int ext4_block_group(struct super_block *sb,
			ext4_fsblk_t blocknr);
extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
			ext4_fsblk_t blocknr);
extern int ext4_bg_has_super(struct super_block *sb, int group);
extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
			ext4_fsblk_t goal, int *errp);
extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
			ext4_fsblk_t goal, unsigned long *count, int *errp);
extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
			ext4_fsblk_t block, unsigned long count);
extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
				 ext4_fsblk_t block, unsigned long count,
				unsigned long *pdquot_freed_blocks);
extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
extern void ext4_check_blocks_bitmap (struct super_block *);
extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
						    unsigned int block_group,
						    struct buffer_head ** bh);
extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
extern void ext4_init_block_alloc_info(struct inode *);
extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);

/* dir.c */
extern int ext4_check_dir_entry(const char *, struct inode *,
				struct ext4_dir_entry_2 *,
				struct buffer_head *, unsigned long);
extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
				    __u32 minor_hash,
				    struct ext4_dir_entry_2 *dirent);
extern void ext4_htree_free_dir_info(struct dir_private_info *p);

/* fsync.c */
extern int ext4_sync_file (struct file *, struct dentry *, int);

/* hash.c */
extern int ext4fs_dirhash(const char *name, int len, struct
			  dx_hash_info *hinfo);

/* ialloc.c */
extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
extern void ext4_free_inode (handle_t *, struct inode *);
extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
extern unsigned long ext4_count_free_inodes (struct super_block *);
extern unsigned long ext4_count_dirs (struct super_block *);
extern void ext4_check_inodes_bitmap (struct super_block *);
extern unsigned long ext4_count_free (struct buffer_head *, unsigned);


/* inode.c */
int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
		struct buffer_head *bh, ext4_fsblk_t blocknr);
struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
	sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
	int create, int extend_disksize);

extern void ext4_read_inode (struct inode *);
extern int  ext4_write_inode (struct inode *, int);
extern int  ext4_setattr (struct dentry *, struct iattr *);
extern void ext4_delete_inode (struct inode *);
extern int  ext4_sync_inode (handle_t *, struct inode *);
extern void ext4_discard_reservation (struct inode *);
extern void ext4_dirty_inode(struct inode *);
extern int ext4_change_inode_journal_flag(struct inode *, int);
extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
extern void ext4_truncate (struct inode *);
extern void ext4_set_inode_flags(struct inode *);
extern void ext4_set_aops(struct inode *inode);
extern int ext4_writepage_trans_blocks(struct inode *);
extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
		struct address_space *mapping, loff_t from);

/* ioctl.c */
extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
		       unsigned long);
extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);

/* namei.c */
extern int ext4_orphan_add(handle_t *, struct inode *);
extern int ext4_orphan_del(handle_t *, struct inode *);
extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
				__u32 start_minor_hash, __u32 *next_hash);

/* resize.c */
extern int ext4_group_add(struct super_block *sb,
				struct ext4_new_group_data *input);
extern int ext4_group_extend(struct super_block *sb,
				struct ext4_super_block *es,
				ext4_fsblk_t n_blocks_count);

/* super.c */
extern void ext4_error (struct super_block *, const char *, const char *, ...)
	__attribute__ ((format (printf, 3, 4)));
extern void __ext4_std_error (struct super_block *, const char *, int);
extern void ext4_abort (struct super_block *, const char *, const char *, ...)
	__attribute__ ((format (printf, 3, 4)));
extern void ext4_warning (struct super_block *, const char *, const char *, ...)
	__attribute__ ((format (printf, 3, 4)));
extern void ext4_update_dynamic_rev (struct super_block *sb);
extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
				      struct ext4_group_desc *bg);
extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
				      struct ext4_group_desc *bg);
extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
				     struct ext4_group_desc *bg);
extern void ext4_block_bitmap_set(struct super_block *sb,
				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
extern void ext4_inode_bitmap_set(struct super_block *sb,
				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
extern void ext4_inode_table_set(struct super_block *sb,
				 struct ext4_group_desc *bg, ext4_fsblk_t blk);

static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
{
	return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
		le32_to_cpu(es->s_blocks_count);
}

static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
{
	return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
		le32_to_cpu(es->s_r_blocks_count);
}

static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
{
	return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
		le32_to_cpu(es->s_free_blocks_count);
}

static inline void ext4_blocks_count_set(struct ext4_super_block *es,
					 ext4_fsblk_t blk)
{
	es->s_blocks_count = cpu_to_le32((u32)blk);
	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
}

static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
					      ext4_fsblk_t blk)
{
	es->s_free_blocks_count = cpu_to_le32((u32)blk);
	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
}

static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
					   ext4_fsblk_t blk)
{
	es->s_r_blocks_count = cpu_to_le32((u32)blk);
	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
}



#define ext4_std_error(sb, errno)				\
do {								\
	if ((errno))						\
		__ext4_std_error((sb), __FUNCTION__, (errno));	\
} while (0)

/*
 * Inodes and files operations
 */

/* dir.c */
extern const struct file_operations ext4_dir_operations;

/* file.c */
extern struct inode_operations ext4_file_inode_operations;
extern const struct file_operations ext4_file_operations;

/* namei.c */
extern struct inode_operations ext4_dir_inode_operations;
extern struct inode_operations ext4_special_inode_operations;

/* symlink.c */
extern struct inode_operations ext4_symlink_inode_operations;
extern struct inode_operations ext4_fast_symlink_inode_operations;

/* extents.c */
extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
			ext4_fsblk_t iblock,
			unsigned long max_blocks, struct buffer_head *bh_result,
			int create, int extend_disksize);
extern void ext4_ext_truncate(struct inode *, struct page *);
extern void ext4_ext_init(struct super_block *);
extern void ext4_ext_release(struct super_block *);
static inline int
ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
			unsigned long max_blocks, struct buffer_head *bh,
			int create, int extend_disksize)
{
	if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
		return ext4_ext_get_blocks(handle, inode, block, max_blocks,
					bh, create, extend_disksize);
	return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
					create, extend_disksize);
}


#endif	/* __KERNEL__ */

#endif	/* _LINUX_EXT4_FS_H */