[net-next-2.6.git] / fs / ocfs2 / ocfs2_fs.h

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * ocfs2_fs.h
 *
 * On-disk structures for OCFS2.
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License, version 2,  as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef _OCFS2_FS_H
#define _OCFS2_FS_H

/* Version */
#define OCFS2_MAJOR_REV_LEVEL		0
#define OCFS2_MINOR_REV_LEVEL          	90

/*
 * An OCFS2 volume starts this way:
 * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
 * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
 * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
 *
 * All other structures are found from the superblock information.
 *
 * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors.  eg, for a
 * blocksize of 2K, it is 4096 bytes into disk.
 */
#define OCFS2_SUPER_BLOCK_BLKNO		2

/*
 * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
 * grow if needed.
 */
#define OCFS2_MIN_CLUSTERSIZE		4096
#define OCFS2_MAX_CLUSTERSIZE		1048576

/*
 * Blocks cannot be bigger than clusters, so the maximum blocksize is the
 * minimum cluster size.
 */
#define OCFS2_MIN_BLOCKSIZE		512
#define OCFS2_MAX_BLOCKSIZE		OCFS2_MIN_CLUSTERSIZE

/* Filesystem magic number */
#define OCFS2_SUPER_MAGIC		0x7461636f

/* Object signatures */
#define OCFS2_SUPER_BLOCK_SIGNATURE	"OCFSV2"
#define OCFS2_INODE_SIGNATURE		"INODE01"
#define OCFS2_EXTENT_BLOCK_SIGNATURE	"EXBLK01"
#define OCFS2_GROUP_DESC_SIGNATURE      "GROUP01"

/* Compatibility flags */
#define OCFS2_HAS_COMPAT_FEATURE(sb,mask)			\
	( OCFS2_SB(sb)->s_feature_compat & (mask) )
#define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask)			\
	( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
#define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask)			\
	( OCFS2_SB(sb)->s_feature_incompat & (mask) )
#define OCFS2_SET_COMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_compat |= (mask)
#define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
#define OCFS2_SET_INCOMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_incompat |= (mask)
#define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_compat &= ~(mask)
#define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_incompat &= ~(mask)

#define OCFS2_FEATURE_COMPAT_SUPP	0
#define OCFS2_FEATURE_INCOMPAT_SUPP	0
#define OCFS2_FEATURE_RO_COMPAT_SUPP	0

/*
 * Heartbeat-only devices are missing journals and other files.  The
 * filesystem driver can't load them, but the library can.  Never put
 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
 */
#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV	0x0002


/*
 * Flags on ocfs2_dinode.i_flags
 */
#define OCFS2_VALID_FL		(0x00000001)	/* Inode is valid */
#define OCFS2_UNUSED2_FL	(0x00000002)
#define OCFS2_ORPHANED_FL	(0x00000004)	/* On the orphan list */
#define OCFS2_UNUSED3_FL	(0x00000008)
/* System inode flags */
#define OCFS2_SYSTEM_FL		(0x00000010)	/* System inode */
#define OCFS2_SUPER_BLOCK_FL	(0x00000020)	/* Super block */
#define OCFS2_LOCAL_ALLOC_FL	(0x00000040)	/* Slot local alloc bitmap */
#define OCFS2_BITMAP_FL		(0x00000080)	/* Allocation bitmap */
#define OCFS2_JOURNAL_FL	(0x00000100)	/* Slot local journal */
#define OCFS2_HEARTBEAT_FL	(0x00000200)	/* Heartbeat area */
#define OCFS2_CHAIN_FL		(0x00000400)	/* Chain allocator */
#define OCFS2_DEALLOC_FL	(0x00000800)	/* Truncate log */

/*
 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 */
#define OCFS2_JOURNAL_DIRTY_FL	(0x00000001)	/* Journal needs recovery */

/*
 * superblock s_state flags
 */
#define OCFS2_ERROR_FS		(0x00000001)	/* FS saw errors */

/* Limit of space in ocfs2_dir_entry */
#define OCFS2_MAX_FILENAME_LEN		255

/* Maximum slots on an ocfs2 file system */
#define OCFS2_MAX_SLOTS			255

/* Slot map indicator for an empty slot */
#define OCFS2_INVALID_SLOT		-1

#define OCFS2_VOL_UUID_LEN		16
#define OCFS2_MAX_VOL_LABEL_LEN		64

/* Journal limits (in bytes) */
#define OCFS2_MIN_JOURNAL_SIZE		(4 * 1024 * 1024)

struct ocfs2_system_inode_info {
	char	*si_name;
	int	si_iflags;
	int	si_mode;
};

/* System file index */
enum {
	BAD_BLOCK_SYSTEM_INODE = 0,
	GLOBAL_INODE_ALLOC_SYSTEM_INODE,
	SLOT_MAP_SYSTEM_INODE,
#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
	HEARTBEAT_SYSTEM_INODE,
	GLOBAL_BITMAP_SYSTEM_INODE,
#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
	ORPHAN_DIR_SYSTEM_INODE,
	EXTENT_ALLOC_SYSTEM_INODE,
	INODE_ALLOC_SYSTEM_INODE,
	JOURNAL_SYSTEM_INODE,
	LOCAL_ALLOC_SYSTEM_INODE,
	TRUNCATE_LOG_SYSTEM_INODE,
	NUM_SYSTEM_INODES
};

static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
	/* Global system inodes (single copy) */
	/* The first two are only used from userspace mfks/tunefs */
	[BAD_BLOCK_SYSTEM_INODE]		= { "bad_blocks", 0, S_IFREG | 0644 },
	[GLOBAL_INODE_ALLOC_SYSTEM_INODE] 	= { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },

	/* These are used by the running filesystem */
	[SLOT_MAP_SYSTEM_INODE]			= { "slot_map", 0, S_IFREG | 0644 },
	[HEARTBEAT_SYSTEM_INODE]		= { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
	[GLOBAL_BITMAP_SYSTEM_INODE]		= { "global_bitmap", 0, S_IFREG | 0644 },

	/* Slot-specific system inodes (one copy per slot) */
	[ORPHAN_DIR_SYSTEM_INODE]		= { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
	[EXTENT_ALLOC_SYSTEM_INODE]		= { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
	[INODE_ALLOC_SYSTEM_INODE]		= { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
	[JOURNAL_SYSTEM_INODE]			= { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
	[LOCAL_ALLOC_SYSTEM_INODE]		= { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
	[TRUNCATE_LOG_SYSTEM_INODE]		= { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
};

/* Parameter passed from mount.ocfs2 to module */
#define OCFS2_HB_NONE			"heartbeat=none"
#define OCFS2_HB_LOCAL			"heartbeat=local"

/*
 * OCFS2 directory file types.  Only the low 3 bits are used.  The
 * other bits are reserved for now.
 */
#define OCFS2_FT_UNKNOWN	0
#define OCFS2_FT_REG_FILE	1
#define OCFS2_FT_DIR		2
#define OCFS2_FT_CHRDEV		3
#define OCFS2_FT_BLKDEV		4
#define OCFS2_FT_FIFO		5
#define OCFS2_FT_SOCK		6
#define OCFS2_FT_SYMLINK	7

#define OCFS2_FT_MAX		8

/*
 * OCFS2_DIR_PAD defines the directory entries boundaries
 *
 * NOTE: It must be a multiple of 4
 */
#define OCFS2_DIR_PAD			4
#define OCFS2_DIR_ROUND			(OCFS2_DIR_PAD - 1)
#define OCFS2_DIR_MEMBER_LEN 		offsetof(struct ocfs2_dir_entry, name)
#define OCFS2_DIR_REC_LEN(name_len)	(((name_len) + OCFS2_DIR_MEMBER_LEN + \
                                          OCFS2_DIR_ROUND) & \
					 ~OCFS2_DIR_ROUND)

#define OCFS2_LINK_MAX		32000

#define S_SHIFT			12
static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
	[S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
	[S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
	[S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
	[S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
	[S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
	[S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
	[S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
};


/*
 * Convenience casts
 */
#define OCFS2_RAW_SB(dinode)		(&((dinode)->id2.i_super))

/*
 * On disk extent record for OCFS2
 * It describes a range of clusters on disk.
 */
struct ocfs2_extent_rec {
/*00*/	__le32 e_cpos;		/* Offset into the file, in clusters */
	__le32 e_clusters;	/* Clusters covered by this extent */
	__le64 e_blkno;		/* Physical disk offset, in blocks */
/*10*/
};

struct ocfs2_chain_rec {
	__le32 c_free;	/* Number of free bits in this chain. */
	__le32 c_total;	/* Number of total bits in this chain */
	__le64 c_blkno;	/* Physical disk offset (blocks) of 1st group */
};

struct ocfs2_truncate_rec {
	__le32 t_start;		/* 1st cluster in this log */
	__le32 t_clusters;	/* Number of total clusters covered */
};

/*
 * On disk extent list for OCFS2 (node in the tree).  Note that this
 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 * offsets are relative to ocfs2_dinode.id2.i_list or
 * ocfs2_extent_block.h_list, respectively.
 */
struct ocfs2_extent_list {
/*00*/	__le16 l_tree_depth;		/* Extent tree depth from this
					   point.  0 means data extents
					   hang directly off this
					   header (a leaf) */
	__le16 l_count;			/* Number of extent records */
	__le16 l_next_free_rec;		/* Next unused extent slot */
	__le16 l_reserved1;
	__le64 l_reserved2;		/* Pad to
					   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_reserved1;
	__le32 s_reserved2;
	__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];
};

/*
 * 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;
/*70*/	__le64 i_reserved1[9];
/*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_pad;
		} 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;
		__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_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);
}
#else
static inline int ocfs2_fast_symlink_chars(int blocksize)
{
	return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
}

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);
}
#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,
				 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 */
Commit	Line	Data
ccd979bd MF	1	/* -- mode: c; c-basic-offset: 8; --
	2	* vim: noexpandtab sw=8 ts=8 sts=0:
	3	*
	4	* ocfs2_fs.h
	5	*
	6	* On-disk structures for OCFS2.
	7	*
	8	* Copyright (C) 2002, 2004 Oracle. All rights reserved.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public
	12	* License, version 2, as published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public
	20	* License along with this program; if not, write to the
	21	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	22	* Boston, MA 021110-1307, USA.
	23	*/
	24
	25	#ifndef _OCFS2_FS_H
	26	#define _OCFS2_FS_H
	27
	28	/* Version */
	29	#define OCFS2_MAJOR_REV_LEVEL 0
	30	#define OCFS2_MINOR_REV_LEVEL 90
	31
	32	/*
	33	* An OCFS2 volume starts this way:
	34	* Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
	35	* Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
	36	* Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
	37	*
	38	* All other structures are found from the superblock information.
	39	*
	40	* OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a
	41	* blocksize of 2K, it is 4096 bytes into disk.
	42	*/
	43	#define OCFS2_SUPER_BLOCK_BLKNO 2
	44
	45	/*
	46	* Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
	47	* grow if needed.
	48	*/
	49	#define OCFS2_MIN_CLUSTERSIZE 4096
	50	#define OCFS2_MAX_CLUSTERSIZE 1048576
	51
	52	/*
	53	* Blocks cannot be bigger than clusters, so the maximum blocksize is the
	54	* minimum cluster size.
	55	*/
	56	#define OCFS2_MIN_BLOCKSIZE 512
	57	#define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE
	58
	59	/* Filesystem magic number */
	60	#define OCFS2_SUPER_MAGIC 0x7461636f
	61
	62	/* Object signatures */
	63	#define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2"
	64	#define OCFS2_INODE_SIGNATURE "INODE01"
65	#define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01"
66	#define OCFS2_GROUP_DESC_SIGNATURE "GROUP01"
67
68	/* Compatibility flags */
69	#define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \
70	( OCFS2_SB(sb)->s_feature_compat & (mask) )
71	#define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \
72	( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
73	#define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \
74	( OCFS2_SB(sb)->s_feature_incompat & (mask) )
75	#define OCFS2_SET_COMPAT_FEATURE(sb,mask) \
76	OCFS2_SB(sb)->s_feature_compat \|= (mask)
77	#define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \
78	OCFS2_SB(sb)->s_feature_ro_compat \|= (mask)
79	#define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \
80	OCFS2_SB(sb)->s_feature_incompat \|= (mask)
81	#define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \
82	OCFS2_SB(sb)->s_feature_compat &= ~(mask)
83	#define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
84	OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
85	#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
86	OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
87
88	#define OCFS2_FEATURE_COMPAT_SUPP 0
89	#define OCFS2_FEATURE_INCOMPAT_SUPP 0
90	#define OCFS2_FEATURE_RO_COMPAT_SUPP 0
91
92	/*
93	* Heartbeat-only devices are missing journals and other files. The
94	* filesystem driver can't load them, but the library can. Never put
95	* this in OCFS2_FEATURE_INCOMPAT_SUPP, ever.
96	*/
97	#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002
98
99
100	/*
101	* Flags on ocfs2_dinode.i_flags
102	*/
103	#define OCFS2_VALID_FL (0x00000001) /* Inode is valid */
104	#define OCFS2_UNUSED2_FL (0x00000002)
105	#define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */
106	#define OCFS2_UNUSED3_FL (0x00000008)
107	/* System inode flags */
108	#define OCFS2_SYSTEM_FL (0x00000010) /* System inode */
109	#define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */
110	#define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */
111	#define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */
112	#define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */
113	#define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */
114	#define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */
115	#define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */
116
117	/*
118	* Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
119	*/
120	#define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */
121
122	/*
123	* superblock s_state flags
124	*/
125	#define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */
126
127	/* Limit of space in ocfs2_dir_entry */
128	#define OCFS2_MAX_FILENAME_LEN 255
129
130	/* Maximum slots on an ocfs2 file system */
131	#define OCFS2_MAX_SLOTS 255
132
133	/* Slot map indicator for an empty slot */
134	#define OCFS2_INVALID_SLOT -1
135
136	#define OCFS2_VOL_UUID_LEN 16
137	#define OCFS2_MAX_VOL_LABEL_LEN 64
138
139	/* Journal limits (in bytes) */
140	#define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
ccd979bd MF	141
	142	struct ocfs2_system_inode_info {
	143	char *si_name;
	144	int si_iflags;
	145	int si_mode;
	146	};
	147
	148	/* System file index */
	149	enum {
	150	BAD_BLOCK_SYSTEM_INODE = 0,
	151	GLOBAL_INODE_ALLOC_SYSTEM_INODE,
	152	SLOT_MAP_SYSTEM_INODE,
	153	#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
	154	HEARTBEAT_SYSTEM_INODE,
	155	GLOBAL_BITMAP_SYSTEM_INODE,
	156	#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
	157	ORPHAN_DIR_SYSTEM_INODE,
	158	EXTENT_ALLOC_SYSTEM_INODE,
	159	INODE_ALLOC_SYSTEM_INODE,
	160	JOURNAL_SYSTEM_INODE,
	161	LOCAL_ALLOC_SYSTEM_INODE,
	162	TRUNCATE_LOG_SYSTEM_INODE,
	163	NUM_SYSTEM_INODES
	164	};
	165
	166	static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
	167	/* Global system inodes (single copy) */
	168	/* The first two are only used from userspace mfks/tunefs */
	169	[BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG \| 0644 },
	170	[GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL \| OCFS2_CHAIN_FL, S_IFREG \| 0644 },
	171
	172	/* These are used by the running filesystem */
	173	[SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG \| 0644 },
	174	[HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG \| 0644 },
	175	[GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG \| 0644 },
	176
	177	/* Slot-specific system inodes (one copy per slot) */
	178	[ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR \| 0755 },
	179	[EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL \| OCFS2_CHAIN_FL, S_IFREG \| 0644 },
	180	[INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL \| OCFS2_CHAIN_FL, S_IFREG \| 0644 },
	181	[JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG \| 0644 },
	182	[LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL \| OCFS2_LOCAL_ALLOC_FL, S_IFREG \| 0644 },
	183	[TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG \| 0644 }
	184	};
	185
	186	/* Parameter passed from mount.ocfs2 to module */
	187	#define OCFS2_HB_NONE "heartbeat=none"
	188	#define OCFS2_HB_LOCAL "heartbeat=local"
	189
	190	/*
	191	* OCFS2 directory file types. Only the low 3 bits are used. The
	192	* other bits are reserved for now.
	193	*/
	194	#define OCFS2_FT_UNKNOWN 0
	195	#define OCFS2_FT_REG_FILE 1
	196	#define OCFS2_FT_DIR 2
	197	#define OCFS2_FT_CHRDEV 3
	198	#define OCFS2_FT_BLKDEV 4
	199	#define OCFS2_FT_FIFO 5
	200	#define OCFS2_FT_SOCK 6
	201	#define OCFS2_FT_SYMLINK 7
	202
	203	#define OCFS2_FT_MAX 8
	204
205	/*
206	* OCFS2_DIR_PAD defines the directory entries boundaries
207	*
208	* NOTE: It must be a multiple of 4
209	*/
210	#define OCFS2_DIR_PAD 4
211	#define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
212	#define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
213	#define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
214	OCFS2_DIR_ROUND) & \
215	~OCFS2_DIR_ROUND)
216
217	#define OCFS2_LINK_MAX 32000
218
219	#define S_SHIFT 12
220	static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
221	[S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
222	[S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
223	[S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
224	[S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
225	[S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
226	[S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
227	[S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
228	};
229
230
231	/*
232	* Convenience casts
233	*/
234	#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
235
236	/*
237	* On disk extent record for OCFS2
238	* It describes a range of clusters on disk.
239	*/
240	struct ocfs2_extent_rec {
241	/00/ __le32 e_cpos; /* Offset into the file, in clusters */
242	__le32 e_clusters; /* Clusters covered by this extent */
243	__le64 e_blkno; /* Physical disk offset, in blocks */
244	/10/
245	};
246
247	struct ocfs2_chain_rec {
248	__le32 c_free; /* Number of free bits in this chain. */
249	__le32 c_total; /* Number of total bits in this chain */
250	__le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
251	};
252
253	struct ocfs2_truncate_rec {
254	__le32 t_start; /* 1st cluster in this log */
255	__le32 t_clusters; /* Number of total clusters covered */
256	};
257
258	/*
259	* On disk extent list for OCFS2 (node in the tree). Note that this
260	* is contained inside ocfs2_dinode or ocfs2_extent_block, so the
261	* offsets are relative to ocfs2_dinode.id2.i_list or
262	* ocfs2_extent_block.h_list, respectively.
263	*/
264	struct ocfs2_extent_list {
265	/00/ __le16 l_tree_depth; /* Extent tree depth from this
266	point. 0 means data extents
267	hang directly off this
268	header (a leaf) */
269	__le16 l_count; /* Number of extent records */
270	__le16 l_next_free_rec; /* Next unused extent slot */
271	__le16 l_reserved1;
272	__le64 l_reserved2; /* Pad to
273	sizeof(ocfs2_extent_rec) */
274	/10/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */
275	};
276
277	/*
278	* On disk allocation chain list for OCFS2. Note that this is
279	* contained inside ocfs2_dinode, so the offsets are relative to
280	* ocfs2_dinode.id2.i_chain.
281	*/
282	struct ocfs2_chain_list {
283	/00/ __le16 cl_cpg; /* Clusters per Block Group */
284	__le16 cl_bpc; /* Bits per cluster */
285	__le16 cl_count; /* Total chains in this list */
286	__le16 cl_next_free_rec; /* Next unused chain slot */
287	__le64 cl_reserved1;
288	/10/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */
289	};
290
291	/*
292	* On disk deallocation log for OCFS2. Note that this is
293	* contained inside ocfs2_dinode, so the offsets are relative to
294	* ocfs2_dinode.id2.i_dealloc.
295	*/
296	struct ocfs2_truncate_log {
297	/00/ __le16 tl_count; /* Total records in this log */
298	__le16 tl_used; /* Number of records in use */
299	__le32 tl_reserved1;
300	/08/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */
301	};
302
303	/*
304	* On disk extent block (indirect block) for OCFS2
305	*/
306	struct ocfs2_extent_block
307	{
308	/00/ __u8 h_signature[8]; /* Signature for verification */
309	__le64 h_reserved1;
310	/10/ __le16 h_suballoc_slot; /* Slot suballocator this
311	extent_header belongs to */
312	__le16 h_suballoc_bit; /* Bit offset in suballocator
313	block group */
314	__le32 h_fs_generation; /* Must match super block */
315	__le64 h_blkno; /* Offset on disk, in blocks */
316	/20/ __le64 h_reserved3;
317	__le64 h_next_leaf_blk; /* Offset on disk, in blocks,
318	of next leaf header pointing
319	to data */
320	/30/ struct ocfs2_extent_list h_list; /* Extent record list */
321	/* Actual on-disk size is one block */
322	};
323
324	/*
325	* On disk superblock for OCFS2
326	* Note that it is contained inside an ocfs2_dinode, so all offsets
327	* are relative to the start of ocfs2_dinode.id2.
328	*/
329	struct ocfs2_super_block {
330	/00/ __le16 s_major_rev_level;
331	__le16 s_minor_rev_level;
332	__le16 s_mnt_count;
333	__le16 s_max_mnt_count;
334	__le16 s_state; /* File system state */
335	__le16 s_errors; /* Behaviour when detecting errors */
336	__le32 s_checkinterval; /* Max time between checks */
337	/10/ __le64 s_lastcheck; /* Time of last check */
338	__le32 s_creator_os; /* OS */
339	__le32 s_feature_compat; /* Compatible feature set */
340	/20/ __le32 s_feature_incompat; /* Incompatible feature set */
341	__le32 s_feature_ro_compat; /* Readonly-compatible feature set */
342	__le64 s_root_blkno; /* Offset, in blocks, of root directory
343	dinode */
344	/30/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system
345	directory dinode */
346	__le32 s_blocksize_bits; /* Blocksize for this fs */
347	__le32 s_clustersize_bits; /* Clustersize for this fs */
348	/40/ __le16 s_max_slots; /* Max number of simultaneous mounts
349	before tunefs required */
350	__le16 s_reserved1;
351	__le32 s_reserved2;
352	__le64 s_first_cluster_group; /* Block offset of 1st cluster
353	* group header */
354	/50/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
355	/90/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
356	/A0/
357	};
358
359	/*
360	* Local allocation bitmap for OCFS2 slots
361	* Note that it exists inside an ocfs2_dinode, so all offsets are
362	* relative to the start of ocfs2_dinode.id2.
363	*/
364	struct ocfs2_local_alloc
365	{
366	/00/ __le32 la_bm_off; /* Starting bit offset in main bitmap */
367	__le16 la_size; /* Size of included bitmap, in bytes */
368	__le16 la_reserved1;
369	__le64 la_reserved2;
370	/10/ __u8 la_bitmap[0];
371	};
372
373	/*
374	* On disk inode for OCFS2
375	*/
376	struct ocfs2_dinode {
377	/00/ __u8 i_signature[8]; /* Signature for validation */
378	__le32 i_generation; /* Generation number */
379	__le16 i_suballoc_slot; /* Slot suballocator this inode
380	belongs to */
381	__le16 i_suballoc_bit; /* Bit offset in suballocator
382	block group */
383	/10/ __le32 i_reserved0;
384	__le32 i_clusters; /* Cluster count */
385	__le32 i_uid; /* Owner UID */
386	__le32 i_gid; /* Owning GID */
387	/20/ __le64 i_size; /* Size in bytes */
388	__le16 i_mode; /* File mode */
389	__le16 i_links_count; /* Links count */
390	__le32 i_flags; /* File flags */
391	/30/ __le64 i_atime; /* Access time */
392	__le64 i_ctime; /* Creation time */
393	/40/ __le64 i_mtime; /* Modification time */
394	__le64 i_dtime; /* Deletion time */
395	/50/ __le64 i_blkno; /* Offset on disk, in blocks */
396	__le64 i_last_eb_blk; /* Pointer to last extent
397	block */
398	/60/ __le32 i_fs_generation; /* Generation per fs-instance */
399	__le32 i_atime_nsec;
400	__le32 i_ctime_nsec;
401	__le32 i_mtime_nsec;
402	/70/ __le64 i_reserved1[9];
403	/B8/ union {
404	__le64 i_pad1; /* Generic way to refer to this
405	64bit union */
406	struct {
407	__le64 i_rdev; /* Device number */
408	} dev1;
409	struct { /* Info for bitmap system
410	inodes */
411	__le32 i_used; /* Bits (ie, clusters) used */
412	__le32 i_total; /* Total bits (clusters)
413	available */
414	} bitmap1;
415	struct { /* Info for journal system
416	inodes */
417	__le32 ij_flags; /* Mounted, version, etc. */
418	__le32 ij_pad;
419	} journal1;
420	} id1; /* Inode type dependant 1 */
421	/C0/ union {
422	struct ocfs2_super_block i_super;
423	struct ocfs2_local_alloc i_lab;
424	struct ocfs2_chain_list i_chain;
425	struct ocfs2_extent_list i_list;
426	struct ocfs2_truncate_log i_dealloc;
427	__u8 i_symlink[0];
428	} id2;
429	/* Actual on-disk size is one block */
430	};
431
432	/*
433	* On-disk directory entry structure for OCFS2
434	*
435	* Packed as this structure could be accessed unaligned on 64-bit platforms
436	*/
437	struct ocfs2_dir_entry {
438	/00/ __le64 inode; /* Inode number */
439	__le16 rec_len; /* Directory entry length */
440	__u8 name_len; /* Name length */
441	__u8 file_type;
442	/0C/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */
443	/* Actual on-disk length specified by rec_len */
444	} __attribute__ ((packed));
445
446	/*
447	* On disk allocator group structure for OCFS2
448	*/
449	struct ocfs2_group_desc
450	{
451	/00/ __u8 bg_signature[8]; /* Signature for validation */
452	__le16 bg_size; /* Size of included bitmap in
453	bytes. */
454	__le16 bg_bits; /* Bits represented by this
455	group. */
456	__le16 bg_free_bits_count; /* Free bits count */
457	__le16 bg_chain; /* What chain I am in. */
458	/10/ __le32 bg_generation;
459	__le32 bg_reserved1;
460	__le64 bg_next_group; /* Next group in my list, in
461	blocks */
462	/20/ __le64 bg_parent_dinode; /* dinode which owns me, in
463	blocks */
464	__le64 bg_blkno; /* Offset on disk, in blocks */
465	/30/ __le64 bg_reserved2[2];
466	/40/ __u8 bg_bitmap[0];
467	};
468
469	#ifdef __KERNEL__
470	static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
471	{
472	return sb->s_blocksize -
473	offsetof(struct ocfs2_dinode, id2.i_symlink);
474	}
475
476	static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
477	{
478	int size;
479
480	size = sb->s_blocksize -
481	offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
482
483	return size / sizeof(struct ocfs2_extent_rec);
484	}
485
486	static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
487	{
488	int size;
489
490	size = sb->s_blocksize -
491	offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
492
493	return size / sizeof(struct ocfs2_chain_rec);
494	}
495
496	static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
497	{
498	int size;
499
500	size = sb->s_blocksize -
501	offsetof(struct ocfs2_extent_block, h_list.l_recs);
502
503	return size / sizeof(struct ocfs2_extent_rec);
504	}
505
506	static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
507	{
508	u16 size;
509
510	size = sb->s_blocksize -
511	offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
512
513	return size;
514	}
515
516	static inline int ocfs2_group_bitmap_size(struct super_block *sb)
517	{
518	int size;
519
520	size = sb->s_blocksize -
521	offsetof(struct ocfs2_group_desc, bg_bitmap);
522
523	return size;
524	}
525
526	static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
527	{
528	int size;
529
530	size = sb->s_blocksize -
531	offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
532
533	return size / sizeof(struct ocfs2_truncate_rec);
534	}
535	#else
536	static inline int ocfs2_fast_symlink_chars(int blocksize)
537	{
538	return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
539	}
540
541	static inline int ocfs2_extent_recs_per_inode(int blocksize)
542	{
543	int size;
544
545	size = blocksize -
546	offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
547
548	return size / sizeof(struct ocfs2_extent_rec);
549	}
550
551	static inline int ocfs2_chain_recs_per_inode(int blocksize)
552	{
553	int size;
554
555	size = blocksize -
556	offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
557
558	return size / sizeof(struct ocfs2_chain_rec);
559	}
560
561	static inline int ocfs2_extent_recs_per_eb(int blocksize)
562	{
563	int size;
564
565	size = blocksize -
566	offsetof(struct ocfs2_extent_block, h_list.l_recs);
567
568	return size / sizeof(struct ocfs2_extent_rec);
569	}
570
571	static inline int ocfs2_local_alloc_size(int blocksize)
572	{
573	int size;
574
575	size = blocksize -
576	offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
577
578	return size;
579	}
580
581	static inline int ocfs2_group_bitmap_size(int blocksize)
582	{
583	int size;
584
585	size = blocksize -
586	offsetof(struct ocfs2_group_desc, bg_bitmap);
587
588	return size;
589	}
590
591	static inline int ocfs2_truncate_recs_per_inode(int blocksize)
592	{
593	int size;
594
595	size = blocksize -
596	offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
597
598	return size / sizeof(struct ocfs2_truncate_rec);
599	}
600	#endif /* __KERNEL__ */
601
602
603	static inline int ocfs2_system_inode_is_global(int type)
604	{
605	return ((type >= 0) &&
606	(type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
607	}
608
609	static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
610	int type, int slot)
611	{
612	int chars;
613
614	/*
615	* Global system inodes can only have one copy. Everything
616	* after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
617	* list has a copy per slot.
618	*/
619	if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
620	chars = snprintf(buf, len,
621	ocfs2_system_inodes[type].si_name);
622	else
623	chars = snprintf(buf, len,
624	ocfs2_system_inodes[type].si_name,
625	slot);
626
627	return chars;
628	}
629
630	static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
631	umode_t mode)
632	{
633	de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
634	}
635
636	#endif /* _OCFS2_FS_H */
637