ocfs2_fs.h

ocfs1.4.1 oracle分布式文件系统

					   sizeof(ocfs2_extent_rec) */
/*10*/	struct ocfs2_extent_rec l_recs[0];	/* Extent records */
};

/*
 * On disk allocation chain list for OCFS2.  Note that this is
 * contained inside ocfs2_dinode, so the offsets are relative to
 * ocfs2_dinode.id2.i_chain.
 */
struct ocfs2_chain_list {
/*00*/	__le16 cl_cpg;			/* Clusters per Block Group */
	__le16 cl_bpc;			/* Bits per cluster */
	__le16 cl_count;		/* Total chains in this list */
	__le16 cl_next_free_rec;	/* Next unused chain slot */
	__le64 cl_reserved1;
/*10*/	struct ocfs2_chain_rec cl_recs[0];	/* Chain records */
};

/*
 * On disk deallocation log for OCFS2.  Note that this is
 * contained inside ocfs2_dinode, so the offsets are relative to
 * ocfs2_dinode.id2.i_dealloc.
 */
struct ocfs2_truncate_log {
/*00*/	__le16 tl_count;		/* Total records in this log */
	__le16 tl_used;			/* Number of records in use */
	__le32 tl_reserved1;
/*08*/	struct ocfs2_truncate_rec tl_recs[0];	/* Truncate records */
};

/*
 * On disk extent block (indirect block) for OCFS2
 */
struct ocfs2_extent_block
{
/*00*/	__u8 h_signature[8];		/* Signature for verification */
	__le64 h_reserved1;
/*10*/	__le16 h_suballoc_slot;		/* Slot suballocator this
					   extent_header belongs to */
	__le16 h_suballoc_bit;		/* Bit offset in suballocator
					   block group */
	__le32 h_fs_generation;		/* Must match super block */
	__le64 h_blkno;			/* Offset on disk, in blocks */
/*20*/	__le64 h_reserved3;
	__le64 h_next_leaf_blk;		/* Offset on disk, in blocks,
					   of next leaf header pointing
					   to data */
/*30*/	struct ocfs2_extent_list h_list;	/* Extent record list */
/* Actual on-disk size is one block */
};

/*
 * On disk superblock for OCFS2
 * Note that it is contained inside an ocfs2_dinode, so all offsets
 * are relative to the start of ocfs2_dinode.id2.
 */
struct ocfs2_super_block {
/*00*/	__le16 s_major_rev_level;
	__le16 s_minor_rev_level;
	__le16 s_mnt_count;
	__le16 s_max_mnt_count;
	__le16 s_state;			/* File system state */
	__le16 s_errors;			/* Behaviour when detecting errors */
	__le32 s_checkinterval;		/* Max time between checks */
/*10*/	__le64 s_lastcheck;		/* Time of last check */
	__le32 s_creator_os;		/* OS */
	__le32 s_feature_compat;		/* Compatible feature set */
/*20*/	__le32 s_feature_incompat;	/* Incompatible feature set */
	__le32 s_feature_ro_compat;	/* Readonly-compatible feature set */
	__le64 s_root_blkno;		/* Offset, in blocks, of root directory
					   dinode */
/*30*/	__le64 s_system_dir_blkno;	/* Offset, in blocks, of system
					   directory dinode */
	__le32 s_blocksize_bits;		/* Blocksize for this fs */
	__le32 s_clustersize_bits;	/* Clustersize for this fs */
/*40*/	__le16 s_max_slots;		/* Max number of simultaneous mounts
					   before tunefs required */
	__le16 s_tunefs_flag;
	__le32 s_reserved1;
	__le64 s_first_cluster_group;	/* Block offset of 1st cluster
					 * group header */
/*50*/	__u8  s_label[OCFS2_MAX_VOL_LABEL_LEN];	/* Label for mounting, etc. */
/*90*/	__u8  s_uuid[OCFS2_VOL_UUID_LEN];	/* 128-bit uuid */
/*A0*/
};

/*
 * Local allocation bitmap for OCFS2 slots
 * Note that it exists inside an ocfs2_dinode, so all offsets are
 * relative to the start of ocfs2_dinode.id2.
 */
struct ocfs2_local_alloc
{
/*00*/	__le32 la_bm_off;	/* Starting bit offset in main bitmap */
	__le16 la_size;		/* Size of included bitmap, in bytes */
	__le16 la_reserved1;
	__le64 la_reserved2;
/*10*/	__u8   la_bitmap[0];
};

/*
 * Data-in-inode header. This is only used if i_dyn_features has
 * OCFS2_INLINE_DATA_FL set.
 */
struct ocfs2_inline_data
{
/*00*/	__le16	id_count;	/* Number of bytes that can be used
				 * for data, starting at id_data */
	__le16	id_reserved0;
	__le32	id_reserved1;
	__u8	id_data[0];	/* Start of user data */
};

/*
 * On disk inode for OCFS2
 */
struct ocfs2_dinode {
/*00*/	__u8 i_signature[8];		/* Signature for validation */
	__le32 i_generation;		/* Generation number */
	__le16 i_suballoc_slot;		/* Slot suballocator this inode
					   belongs to */
	__le16 i_suballoc_bit;		/* Bit offset in suballocator
					   block group */
/*10*/	__le32 i_reserved0;
	__le32 i_clusters;		/* Cluster count */
	__le32 i_uid;			/* Owner UID */
	__le32 i_gid;			/* Owning GID */
/*20*/	__le64 i_size;			/* Size in bytes */
	__le16 i_mode;			/* File mode */
	__le16 i_links_count;		/* Links count */
	__le32 i_flags;			/* File flags */
/*30*/	__le64 i_atime;			/* Access time */
	__le64 i_ctime;			/* Creation time */
/*40*/	__le64 i_mtime;			/* Modification time */
	__le64 i_dtime;			/* Deletion time */
/*50*/	__le64 i_blkno;			/* Offset on disk, in blocks */
	__le64 i_last_eb_blk;		/* Pointer to last extent
					   block */
/*60*/	__le32 i_fs_generation;		/* Generation per fs-instance */
	__le32 i_atime_nsec;
	__le32 i_ctime_nsec;
	__le32 i_mtime_nsec;
	__le32 i_attr;
	__le16 i_orphaned_slot;		/* Only valid when OCFS2_ORPHANED_FL
					   was set in i_flags */
	__le16 i_dyn_features;
/*70*/	__le64 i_reserved2[8];
/*B8*/	union {
		__le64 i_pad1;		/* Generic way to refer to this
					   64bit union */
		struct {
			__le64 i_rdev;	/* Device number */
		} dev1;
		struct {		/* Info for bitmap system
					   inodes */
			__le32 i_used;	/* Bits (ie, clusters) used  */
			__le32 i_total;	/* Total bits (clusters)
					   available */
		} bitmap1;
		struct {		/* Info for journal system
					   inodes */
			__le32 ij_flags;	/* Mounted, version, etc. */
			__le32 ij_recovery_generation; /* Incremented when the
							  journal is recovered
							  after an unclean
							  shutdown */
		} journal1;
	} id1;				/* Inode type dependant 1 */
/*C0*/	union {
		struct ocfs2_super_block	i_super;
		struct ocfs2_local_alloc	i_lab;
		struct ocfs2_chain_list		i_chain;
		struct ocfs2_extent_list	i_list;
		struct ocfs2_truncate_log	i_dealloc;
		struct ocfs2_inline_data	i_data;
		__u8               		i_symlink[0];
	} id2;
/* Actual on-disk size is one block */
};

/*
 * On-disk directory entry structure for OCFS2
 *
 * Packed as this structure could be accessed unaligned on 64-bit platforms
 */
struct ocfs2_dir_entry {
/*00*/	__le64   inode;                  /* Inode number */
	__le16   rec_len;                /* Directory entry length */
	__u8    name_len;               /* Name length */
	__u8    file_type;
/*0C*/	char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
/* Actual on-disk length specified by rec_len */
} __attribute__ ((packed));

/*
 * On disk allocator group structure for OCFS2
 */
struct ocfs2_group_desc
{
/*00*/	__u8    bg_signature[8];        /* Signature for validation */
	__le16   bg_size;                /* Size of included bitmap in
					   bytes. */
	__le16   bg_bits;                /* Bits represented by this
					   group. */
	__le16	bg_free_bits_count;     /* Free bits count */
	__le16   bg_chain;               /* What chain I am in. */
/*10*/	__le32   bg_generation;
	__le32	bg_reserved1;
	__le64   bg_next_group;          /* Next group in my list, in
					   blocks */
/*20*/	__le64   bg_parent_dinode;       /* dinode which owns me, in
					   blocks */
	__le64   bg_blkno;               /* Offset on disk, in blocks */
/*30*/	__le64   bg_reserved2[2];
/*40*/	__u8    bg_bitmap[0];
};

#ifdef __KERNEL__
static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
{
	return  sb->s_blocksize -
		 offsetof(struct ocfs2_dinode, id2.i_symlink);
}

static inline int ocfs2_max_inline_data(struct super_block *sb)
{
	return sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_data.id_data);
}

static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);

	return size / sizeof(struct ocfs2_chain_rec);
}

static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_extent_block, h_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
{
	u16 size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);

	return size;
}

static inline int ocfs2_group_bitmap_size(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_group_desc, bg_bitmap);

	return size;
}

static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);

	return size / sizeof(struct ocfs2_truncate_rec);
}

static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
{
	u64 offset = OCFS2_BACKUP_SB_START;

	if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
		offset <<= (2 * index);
		offset >>= sb->s_blocksize_bits;
		return offset;
	}

	return 0;

}
#else
static inline int ocfs2_fast_symlink_chars(int blocksize)
{
	return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
}

static inline int ocfs2_max_inline_data(int blocksize)
{
	return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data);
}

static inline int ocfs2_extent_recs_per_inode(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_dinode, id2.i_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_chain_recs_per_inode(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);

	return size / sizeof(struct ocfs2_chain_rec);
}

static inline int ocfs2_extent_recs_per_eb(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_extent_block, h_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_local_alloc_size(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);

	return size;
}

static inline int ocfs2_group_bitmap_size(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_group_desc, bg_bitmap);

	return size;
}

static inline int ocfs2_truncate_recs_per_inode(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);

	return size / sizeof(struct ocfs2_truncate_rec);
}

static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
{
	uint64_t offset = OCFS2_BACKUP_SB_START;

	if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
		offset <<= (2 * index);
		offset /= blocksize;
		return offset;
	}

	return 0;
}
#endif  /* __KERNEL__ */


static inline int ocfs2_system_inode_is_global(int type)
{
	return ((type >= 0) &&
		(type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
}

static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
						  int type, int slot)
{
	int chars;

        /*
         * Global system inodes can only have one copy.  Everything
         * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
         * list has a copy per slot.
         */
	if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
		chars = snprintf(buf, len, "%s",
				 ocfs2_system_inodes[type].si_name);
	else
		chars = snprintf(buf, len,
				 ocfs2_system_inodes[type].si_name,
				 slot);

	return chars;
}

static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
				    umode_t mode)
{
	de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
}

#endif  /* _OCFS2_FS_H */