cregit-Linux how code gets into the kernel

Release 4.11 fs/ocfs2/ocfs2_fs.h

Directory: fs/ocfs2
/* -*- 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"

#define OCFS2_XATTR_BLOCK_SIGNATURE	"XATTR01"

#define OCFS2_DIR_TRAILER_SIGNATURE	"DIRTRL1"

#define OCFS2_DX_ROOT_SIGNATURE		"DXDIR01"

#define OCFS2_DX_LEAF_SIGNATURE		"DXLEAF1"

#define OCFS2_REFCOUNT_BLOCK_SIGNATURE	"REFCNT1"

/* 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	(OCFS2_FEATURE_COMPAT_BACKUP_SB \
                                         | OCFS2_FEATURE_COMPAT_JBD2_SB)

#define OCFS2_FEATURE_INCOMPAT_SUPP	(OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
                                         | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
                                         | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
                                         | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
                                         | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
                                         | OCFS2_FEATURE_INCOMPAT_XATTR \
                                         | OCFS2_FEATURE_INCOMPAT_META_ECC \
                                         | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
                                         | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \
                                         | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG  \
                                         | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO \
                                         | OCFS2_FEATURE_INCOMPAT_APPEND_DIO)

#define OCFS2_FEATURE_RO_COMPAT_SUPP	(OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
                                         | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
                                         | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)

/*
 * 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

/*
 * tunefs sets this incompat flag before starting the resize and clears it
 * at the end. This flag protects users from inadvertently mounting the fs
 * after an aborted run without fsck-ing.
 */

#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG    0x0004

/* Used to denote a non-clustered volume */

#define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT	0x0008

/* Support for sparse allocation in b-trees */

#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC	0x0010

/*
 * Tunefs sets this incompat flag before starting an operation which
 * would require cleanup on abort. This is done to protect users from
 * inadvertently mounting the fs after an aborted run without
 * fsck-ing.
 *
 * s_tunefs_flags on the super block describes precisely which
 * operations were in progress.
 */

#define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG	0x0020

/* Support for data packed into inode blocks */

#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA	0x0040

/*
 * Support for alternate, userspace cluster stacks.  If set, the superblock
 * field s_cluster_info contains a tag for the alternate stack in use as
 * well as the name of the cluster being joined.
 * mount.ocfs2 must pass in a matching stack name.
 *
 * If not set, the classic stack will be used.  This is compatbile with
 * all older versions.
 */

#define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK	0x0080

/* Support for the extended slot map */

#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100

/* Support for extended attributes */

#define OCFS2_FEATURE_INCOMPAT_XATTR		0x0200

/* Support for indexed directores */

#define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS	0x0400

/* Metadata checksum and error correction */

#define OCFS2_FEATURE_INCOMPAT_META_ECC		0x0800

/* Refcount tree support */

#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE	0x1000

/* Discontiguous block groups */

#define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG	0x2000

/*
 * Incompat bit to indicate useable clusterinfo with stackflags for all
 * cluster stacks (userspace adnd o2cb). If this bit is set,
 * INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set.
 */

#define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO	0x4000

/*
 * Append Direct IO support
 */

#define OCFS2_FEATURE_INCOMPAT_APPEND_DIO	0x8000

/*
 * backup superblock flag is used to indicate that this volume
 * has backup superblocks.
 */

#define OCFS2_FEATURE_COMPAT_BACKUP_SB		0x0001

/*
 * The filesystem will correctly handle journal feature bits.
 */

#define OCFS2_FEATURE_COMPAT_JBD2_SB		0x0002

/*
 * Unwritten extents support.
 */

#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN	0x0001

/*
 * Maintain quota information for this filesystem
 */

#define OCFS2_FEATURE_RO_COMPAT_USRQUOTA	0x0002

#define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA	0x0004


/* The byte offset of the first backup block will be 1G.
 * The following will be 4G, 16G, 64G, 256G and 1T.
 */

#define OCFS2_BACKUP_SB_START			1 << 30

/* the max backup superblock nums */

#define OCFS2_MAX_BACKUP_SUPERBLOCKS	6

/*
 * Flags on ocfs2_super_block.s_tunefs_flags
 */

#define OCFS2_TUNEFS_INPROG_REMOVE_SLOT		0x0001	
/* Removing slots */

/*
 * 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 */

#define OCFS2_QUOTA_FL		(0x00001000)	
/* Quota file */

#define OCFS2_DIO_ORPHANED_FL	(0X00002000)	
/* On the orphan list especially
                                                 * for dio */

/*
 * Flags on ocfs2_dinode.i_dyn_features
 *
 * These can change much more often than i_flags. When adding flags,
 * keep in mind that i_dyn_features is only 16 bits wide.
 */

#define OCFS2_INLINE_DATA_FL	(0x0001)	
/* Data stored in inode block */

#define OCFS2_HAS_XATTR_FL	(0x0002)

#define OCFS2_INLINE_XATTR_FL	(0x0004)

#define OCFS2_INDEXED_DIR_FL	(0x0008)

#define OCFS2_HAS_REFCOUNT_FL   (0x0010)

/* Inode attributes, keep in sync with EXT2 */

#define OCFS2_SECRM_FL			FS_SECRM_FL	
/* Secure deletion */

#define OCFS2_UNRM_FL			FS_UNRM_FL	
/* Undelete */

#define OCFS2_COMPR_FL			FS_COMPR_FL	
/* Compress file */

#define OCFS2_SYNC_FL			FS_SYNC_FL	
/* Synchronous updates */

#define OCFS2_IMMUTABLE_FL		FS_IMMUTABLE_FL	
/* Immutable file */

#define OCFS2_APPEND_FL			FS_APPEND_FL	
/* writes to file may only append */

#define OCFS2_NODUMP_FL			FS_NODUMP_FL	
/* do not dump file */

#define OCFS2_NOATIME_FL		FS_NOATIME_FL	
/* do not update atime */
/* Reserved for compression usage... */

#define OCFS2_DIRTY_FL			FS_DIRTY_FL

#define OCFS2_COMPRBLK_FL		FS_COMPRBLK_FL	
/* One or more compressed clusters */

#define OCFS2_NOCOMP_FL			FS_NOCOMP_FL	
/* Don't compress */

#define OCFS2_ECOMPR_FL			FS_ECOMPR_FL	
/* Compression error */
/* End compression flags --- maybe not all used */

#define OCFS2_BTREE_FL			FS_BTREE_FL	
/* btree format dir */

#define OCFS2_INDEX_FL			FS_INDEX_FL	
/* hash-indexed directory */

#define OCFS2_IMAGIC_FL			FS_IMAGIC_FL	
/* AFS directory */

#define OCFS2_JOURNAL_DATA_FL		FS_JOURNAL_DATA_FL 
/* Reserved for ext3 */

#define OCFS2_NOTAIL_FL			FS_NOTAIL_FL	
/* file tail should not be merged */

#define OCFS2_DIRSYNC_FL		FS_DIRSYNC_FL	
/* dirsync behaviour (directories only) */

#define OCFS2_TOPDIR_FL			FS_TOPDIR_FL	
/* Top of directory hierarchies*/

#define OCFS2_RESERVED_FL		FS_RESERVED_FL	
/* reserved for ext2 lib */


#define OCFS2_FL_VISIBLE		FS_FL_USER_VISIBLE	
/* User visible flags */

#define OCFS2_FL_MODIFIABLE		FS_FL_USER_MODIFIABLE	
/* User modifiable flags */

/*
 * Extent record flags (e_node.leaf.flags)
 */

#define OCFS2_EXT_UNWRITTEN		(0x01)	
/* Extent is allocated but
                                                 * unwritten */

#define OCFS2_EXT_REFCOUNTED		(0x02)  
/* Extent is reference
                                                 * counted in an associated
                                                 * refcount tree */

/*
 * 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

/* The cluster stack fields */

#define OCFS2_STACK_LABEL_LEN		4

#define OCFS2_CLUSTER_NAME_LEN		16

/* Classic (historically speaking) cluster stack */

#define OCFS2_CLASSIC_CLUSTER_STACK	"o2cb"

/* Journal limits (in bytes) */

#define OCFS2_MIN_JOURNAL_SIZE		(4 * 1024 * 1024)

/*
 * Inline extended attribute size (in bytes)
 * The value chosen should be aligned to 16 byte boundaries.
 */

#define OCFS2_MIN_XATTR_INLINE_SIZE     256

/*
 * Cluster info flags (ocfs2_cluster_info.ci_stackflags)
 */

#define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT	(0x01)


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,
	
USER_QUOTA_SYSTEM_INODE,
	
GROUP_QUOTA_SYSTEM_INODE,

#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE

#define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_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,
	
LOCAL_USER_QUOTA_SYSTEM_INODE,
	
LOCAL_GROUP_QUOTA_SYSTEM_INODE,

#define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
	
NUM_SYSTEM_INODES
};

#define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE

#define NUM_LOCAL_SYSTEM_INODES	\
		(NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)


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 },
	[USER_QUOTA_SYSTEM_INODE]		= { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
	[GROUP_QUOTA_SYSTEM_INODE]		= { "aquota.group", OCFS2_QUOTA_FL, 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 },
	[LOCAL_USER_QUOTA_SYSTEM_INODE]		= { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
	[LOCAL_GROUP_QUOTA_SYSTEM_INODE]	= { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
};

/* Parameter passed from mount.ocfs2 to module */

#define OCFS2_HB_NONE			"heartbeat=none"

#define OCFS2_HB_LOCAL			"heartbeat=local"

#define OCFS2_HB_GLOBAL			"heartbeat=global"

/*
 * 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_DIR_MIN_REC_LEN	OCFS2_DIR_REC_LEN(1)


#define OCFS2_LINK_MAX		32000

#define	OCFS2_DX_LINK_MAX	((1U << 31) - 1U)

#define	OCFS2_LINKS_HI_SHIFT	16

#define	OCFS2_DX_ENTRIES_MAX	(0xffffffffU)


#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))

/*
 * Block checking structure.  This is used in metadata to validate the
 * contents.  If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
 * zeros.
 */

struct ocfs2_block_check {

/*00*/	__le32 bc_crc32e;	/* 802.3 Ethernet II CRC32 */
	
__le16 bc_ecc;		/* Single-error-correction parity vector.
                                   This is a simple Hamming code dependent
                                   on the blocksize.  OCFS2's maximum
                                   blocksize, 4K, requires 16 parity bits,
                                   so we fit in __le16. */
	
__le16 bc_reserved1;
/*08*/
};

/*
 * On disk extent record for OCFS2
 * It describes a range of clusters on disk.
 *
 * Length fields are divided into interior and leaf node versions.
 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
 */

struct ocfs2_extent_rec {

/*00*/	__le32 e_cpos;		/* Offset into the file, in clusters */
	union {
		
__le32 e_int_clusters; /* Clusters covered by all children */
		struct {
			
__le16 e_leaf_clusters; /* Clusters covered by this
                                                   extent */
			
__u8 e_reserved1;
			
__u8 e_flags; /* Extent flags */
		};
	};
	
__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)
                                           NOTE: The high 8 bits cannot be
                                           used - tree_depth is never that big.
                                        */
	
__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 */
	
struct ocfs2_block_check h_check;	/* Error checking */

/*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_suballoc_loc;		/* Suballocator block group this
                                           eb belongs to.  Only valid
                                           if allocated from a
                                           discontiguous block group */
	
__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 slot map for OCFS2.  This defines the contents of the "slot_map"
 * system file.  A slot is valid if it contains a node number >= 0.  The
 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT.  This marks a slot empty.
 */

struct ocfs2_slot_map {

/*00*/	__le16 sm_slots[0];
/*
 * Actual on-disk size is one block.  OCFS2_MAX_SLOTS is 255,
 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
 */
};


struct ocfs2_extended_slot {

/*00*/	__u8	es_valid;
	
__u8	es_reserved1[3];
	
__le32	es_node_num;
/*08*/
};

/*
 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
 * is set.  It separates out the valid marker from the node number, and
 * has room to grow.  Unlike the old slot map, this format is defined by
 * i_size.
 */

struct ocfs2_slot_map_extended {

/*00*/	struct ocfs2_extended_slot se_slots[0];
/*
 * Actual size is i_size of the slot_map system file.  It should
 * match s_max_slots * sizeof(struct ocfs2_extended_slot)
 */
};

/*
 * ci_stackflags is only valid if the incompat bit
 * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set.
 */

struct ocfs2_cluster_info {

/*00*/	__u8   ci_stack[OCFS2_STACK_LABEL_LEN];
	union {
		
__le32 ci_reserved;
		struct {
			
__u8 ci_stackflags;
			
__u8 ci_reserved1;
			
__u8 ci_reserved2;
			
__u8 ci_reserved3;
		};
	};

/*08*/	__u8   ci_cluster[OCFS2_CLUSTER_NAME_LEN];
/*18*/
};

/*
 * 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_uuid_hash;		/* hash value of uuid */
	
__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*/  struct ocfs2_cluster_info s_cluster_info; /* Only valid if either
                                                     userspace or clusterinfo
                                                     INCOMPAT flag set. */

/*B8*/	__le16 s_xattr_inline_size;	/* extended attribute inline size
                                           for this fs*/
	
__le16 s_reserved0;
	
__le32 s_dx_seed[3];		/* seed[0-2] for dx dir hash.
                                         * s_uuid_hash serves as seed[3]. */

/*C0*/  __le64 s_reserved2[15];		/* Fill out superblock */
/*140*/

	/*
         * NOTE: As stated above, all offsets are relative to
         * ocfs2_dinode.id2, which is at 0xC0 in the inode.
         * 0xC0 + 0x140 = 0x200 or 512 bytes.  A superblock must fit within
         * our smallest blocksize, which is 512 bytes.  To ensure this,
         * we reserve the space in s_reserved2.  Anything past s_reserved2
         * will not be available on the smallest blocksize.
         */
};

/*
 * 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*/	__le16 i_links_count_hi;	/* High 16 bits of links count */
	
__le16 i_xattr_inline_size;
	
__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*/	__le32 i_attr;
	
__le16 i_orphaned_slot;		/* Only valid when OCFS2_ORPHANED_FL
                                           was set in i_flags */
	
__le16 i_dyn_features;
	
__le64 i_xattr_loc;

/*80*/	struct ocfs2_block_check i_check;	/* Error checking */

/*88*/	__le64 i_dx_root;		/* Pointer to dir index root block */

/*90*/	__le64 i_refcount_loc;
	
__le64 i_suballoc_loc;		/* Suballocator block group this
                                           inode belongs to.  Only valid
                                           if allocated from a
                                           discontiguous block group */

/*A0*/	__le16 i_dio_orphaned_slot;	/* only used for append dio write */
	
__le16 i_reserved1[3];
	
__le64 i_reserved2[2];
/*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 dependent 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));

/*
 * Per-block record for the unindexed directory btree. This is carefully
 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
 * mirrored. That way, the directory manipulation code needs a minimal amount
 * of update.
 *
 * NOTE: Keep this structure aligned to a multiple of 4 bytes.
 */

struct ocfs2_dir_block_trailer {

/*00*/	__le64		db_compat_inode;	/* Always zero. Was inode */

	
__le16		db_compat_rec_len;	/* Backwards compatible with
                                                 * ocfs2_dir_entry. */
	
__u8		db_compat_name_len;	/* Always zero. Was name_len */
	
__u8		db_reserved0;
	
__le16		db_reserved1;
	
__le16		db_free_rec_len;	/* Size of largest empty hole
                                                 * in this block. (unused) */

/*10*/	__u8		db_signature[8];	/* Signature for verification */
	
__le64		db_reserved2;
	
__le64		db_free_next;		/* Next block in list (unused) */

/*20*/	__le64		db_blkno;		/* Offset on disk, in blocks */
	
__le64		db_parent_dinode;	/* dinode which owns me, in
                                                   blocks */

/*30*/	struct ocfs2_block_check db_check;	/* Error checking */
/*40*/
};

 /*
 * A directory entry in the indexed tree. We don't store the full name here,
 * but instead provide a pointer to the full dirent in the unindexed tree.
 *
 * We also store name_len here so as to reduce the number of leaf blocks we
 * need to search in case of collisions.
 */

struct ocfs2_dx_entry {
	
__le32		dx_major_hash;	/* Used to find logical
                                         * cluster in index */
	
__le32		dx_minor_hash;	/* Lower bits used to find
                                         * block in cluster */
	
__le64		dx_dirent_blk;	/* Physical block in unindexed
                                         * tree holding this dirent. */
};


struct ocfs2_dx_entry_list {
	
__le32		de_reserved;
	
__le16		de_count;	/* Maximum number of entries
                                         * possible in de_entries */
	
__le16		de_num_used;	/* Current number of
                                         * de_entries entries */
	
struct	ocfs2_dx_entry		de_entries[0];	/* Indexed dir entries
                                                         * in a packed array of
                                                         * length de_num_used */
};


#define OCFS2_DX_FLAG_INLINE	0x01

/*
 * A directory indexing block. Each indexed directory has one of these,
 * pointed to by ocfs2_dinode.
 *
 * This block stores an indexed btree root, and a set of free space
 * start-of-list pointers.
 */

struct ocfs2_dx_root_block {
	
__u8		dr_signature[8];	/* Signature for verification */
	
struct ocfs2_block_check dr_check;	/* Error checking */
	
__le16		dr_suballoc_slot;	/* Slot suballocator this
                                                 * block belongs to. */
	
__le16		dr_suballoc_bit;	/* Bit offset in suballocator
                                                 * block group */
	
__le32		dr_fs_generation;	/* Must match super block */
	
__le64		dr_blkno;		/* Offset on disk, in blocks */
	
__le64		dr_last_eb_blk;		/* Pointer to last
                                                 * extent block */
	
__le32		dr_clusters;		/* Clusters allocated
                                                 * to the indexed tree. */
	
__u8		dr_flags;		/* OCFS2_DX_FLAG_* flags */
	
__u8		dr_reserved0;
	
__le16		dr_reserved1;
	
__le64		dr_dir_blkno;		/* Pointer to parent inode */
	
__le32		dr_num_entries;		/* Total number of
                                                 * names stored in
                                                 * this directory.*/
	
__le32		dr_reserved2;
	
__le64		dr_free_blk;		/* Pointer to head of free
                                                 * unindexed block list. */
	
__le64		dr_suballoc_loc;	/* Suballocator block group
                                                   this root belongs to.
                                                   Only valid if allocated
                                                   from a discontiguous
                                                   block group */
	
__le64		dr_reserved3[14];
	union {
		
struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
                                                   * bits for maximum space
                                                   * efficiency. */
		
struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
                                                        * entries. We grow out
                                                        * to extents if this
                                                        * gets too big. */
	};
};

/*
 * The header of a leaf block in the indexed tree.
 */

struct ocfs2_dx_leaf {
	
__u8		dl_signature[8];/* Signature for verification */
	
struct ocfs2_block_check dl_check;	/* Error checking */
	
__le64		dl_blkno;	/* Offset on disk, in blocks */
	
__le32		dl_fs_generation;/* Must match super block */
	
__le32		dl_reserved0;
	
__le64		dl_reserved1;
	
struct ocfs2_dx_entry_list	dl_list;
};

/*
 * Largest bitmap for a block (suballocator) group in bytes.  This limit
 * does not affect cluster groups (global allocator).  Cluster group
 * bitmaps run to the end of the block.
 */

#define OCFS2_MAX_BG_BITMAP_SIZE	256

/*
 * 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*/	struct ocfs2_block_check bg_check;	/* Error checking */
	
__le64   bg_reserved2;
/*40*/	union {
		
__u8    bg_bitmap[0];
		struct {
			/*
                         * Block groups may be discontiguous when
                         * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set.
                         * The extents of a discontiguous block group are
                         * stored in bg_list.  It is a flat list.
                         * l_tree_depth must always be zero.  A
                         * discontiguous group is signified by a non-zero
                         * bg_list->l_next_free_rec.  Only block groups
                         * can be discontiguous; Cluster groups cannot.
                         * We've never made a block group with more than
                         * 2048 blocks (256 bytes of bg_bitmap).  This
                         * codifies that limit so that we can fit bg_list.
                         * bg_size of a discontiguous block group will
                         * be 256 to match bg_bitmap_filler.
                         */
			
__u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE];

/*140*/			struct ocfs2_extent_list bg_list;
		};
	};
/* Actual on-disk size is one block */
};


struct ocfs2_refcount_rec {

/*00*/	__le64 r_cpos;		/* Physical offset, in clusters */
	
__le32 r_clusters;	/* Clusters covered by this extent */
	
__le32 r_refcount;	/* Reference count of this extent */
/*10*/
};

#define OCFS2_32BIT_POS_MASK		(0xffffffffULL)


#define OCFS2_REFCOUNT_LEAF_FL          (0x00000001)

#define OCFS2_REFCOUNT_TREE_FL          (0x00000002)


struct ocfs2_refcount_list {

/*00*/	__le16 rl_count;	/* Maximum number of entries possible
                                   in rl_records */
	
__le16 rl_used;		/* Current number of used records */
	
__le32 rl_reserved2;
	
__le64 rl_reserved1;	/* Pad to sizeof(ocfs2_refcount_record) */

/*10*/	struct ocfs2_refcount_rec rl_recs[0];	/* Refcount records */
};



struct ocfs2_refcount_block {

/*00*/	__u8 rf_signature[8];		/* Signature for verification */
	
__le16 rf_suballoc_slot;	/* Slot suballocator this block
                                           belongs to */
	
__le16 rf_suballoc_bit;		/* Bit offset in suballocator
                                           block group */
	
__le32 rf_fs_generation;	/* Must match superblock */

/*10*/	__le64 rf_blkno;		/* Offset on disk, in blocks */
	
__le64 rf_parent;		/* Parent block, only valid if
                                           OCFS2_REFCOUNT_LEAF_FL is set in
                                           rf_flags */

/*20*/	struct ocfs2_block_check rf_check;	/* Error checking */
	
__le64 rf_last_eb_blk;		/* Pointer to last extent block */

/*30*/	__le32 rf_count;		/* Number of inodes sharing this
                                           refcount tree */
	
__le32 rf_flags;		/* See the flags above */
	
__le32 rf_clusters;		/* clusters covered by refcount tree. */
	
__le32 rf_cpos;			/* cluster offset in refcount tree.*/

/*40*/	__le32 rf_generation;		/* generation number. all be the same
                                         * for the same refcount tree. */
	
__le32 rf_reserved0;
	
__le64 rf_suballoc_loc;		/* Suballocator block group this
                                           refcount block belongs to. Only
                                           valid if allocated from a
                                           discontiguous block group */

/*50*/	__le64 rf_reserved1[6];
/*80*/	union {
		
struct ocfs2_refcount_list rf_records;  /* List of refcount
                                                          records */
		
struct ocfs2_extent_list rf_list;	/* Extent record list,
                                                        only valid if
                                                        OCFS2_REFCOUNT_TREE_FL
                                                        is set in rf_flags */
	};
/* Actual on-disk size is one block */
};

/*
 * On disk extended attribute structure for OCFS2.
 */

/*
 * ocfs2_xattr_entry indicates one extend attribute.
 *
 * Note that it can be stored in inode, one block or one xattr bucket.
 */

struct ocfs2_xattr_entry {
	
__le32	xe_name_hash;    /* hash value of xattr prefix+suffix. */
	
__le16	xe_name_offset;  /* byte offset from the 1st entry in the
                                    local xattr storage(inode, xattr block or
                                    xattr bucket). */
	
__u8	xe_name_len;	 /* xattr name len, doesn't include prefix. */
	
__u8	xe_type;         /* the low 7 bits indicate the name prefix
                                  * type and the highest bit indicates whether
                                  * the EA is stored in the local storage. */
	
__le64	xe_value_size;	 /* real xattr value length. */
};

/*
 * On disk structure for xattr header.
 *
 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
 * the local xattr storage.
 */

struct ocfs2_xattr_header {
	
__le16	xh_count;                       /* contains the count of how
                                                   many records are in the
                                                   local xattr storage. */
	
__le16	xh_free_start;                  /* current offset for storing
                                                   xattr. */
	
__le16	xh_name_value_len;              /* total length of name/value
                                                   length in this bucket. */
	
__le16	xh_num_buckets;                 /* Number of xattr buckets
                                                   in this extent record,
                                                   only valid in the first
                                                   bucket. */
	
struct ocfs2_block_check xh_check;	/* Error checking
                                                   (Note, this is only
                                                    used for xattr
                                                    buckets.  A block uses
                                                    xb_check and sets
                                                    this field to zero.) */
	
struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
};

/*
 * On disk structure for xattr value root.
 *
 * When an xattr's value is large enough, it is stored in an external
 * b-tree like file data.  The xattr value root points to this structure.
 */

struct ocfs2_xattr_value_root {

/*00*/	__le32	xr_clusters;              /* clusters covered by xattr value. */
	
__le32	xr_reserved0;
	
__le64	xr_last_eb_blk;           /* Pointer to last extent block */

/*10*/	struct ocfs2_extent_list xr_list; /* Extent record list */
};

/*
 * On disk structure for xattr tree root.
 *
 * It is used when there are too many extended attributes for one file. These
 * attributes will be organized and stored in an indexed-btree.
 */

struct ocfs2_xattr_tree_root {

/*00*/	__le32	xt_clusters;              /* clusters covered by xattr. */
	
__le32	xt_reserved0;
	
__le64	xt_last_eb_blk;           /* Pointer to last extent block */

/*10*/	struct ocfs2_extent_list xt_list; /* Extent record list */
};


#define OCFS2_XATTR_INDEXED	0x1

#define OCFS2_HASH_SHIFT	5

#define OCFS2_XATTR_ROUND	3

#define OCFS2_XATTR_SIZE(size)	(((size) + OCFS2_XATTR_ROUND) & \
                                ~(OCFS2_XATTR_ROUND))


#define OCFS2_XATTR_BUCKET_SIZE			4096

#define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET 	(OCFS2_XATTR_BUCKET_SIZE \
                                                 / OCFS2_MIN_BLOCKSIZE)

/*
 * On disk structure for xattr block.
 */

struct ocfs2_xattr_block {

/*00*/	__u8	xb_signature[8];     /* Signature for verification */
	
__le16	xb_suballoc_slot;    /* Slot suballocator this
                                        block belongs to. */
	
__le16	xb_suballoc_bit;     /* Bit offset in suballocator
                                        block group */
	
__le32	xb_fs_generation;    /* Must match super block */

/*10*/	__le64	xb_blkno;            /* Offset on disk, in blocks */
	
struct ocfs2_block_check xb_check;	/* Error checking */

/*20*/	__le16	xb_flags;            /* Indicates whether this block contains
                                        real xattr or a xattr tree. */
	
__le16	xb_reserved0;
	
__le32  xb_reserved1;
	
__le64	xb_suballoc_loc;	/* Suballocator block group this
                                           xattr block belongs to. Only
                                           valid if allocated from a
                                           discontiguous block group */
/*30*/	union {
		
struct ocfs2_xattr_header xb_header; /* xattr header if this
                                                        block contains xattr */
		
struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
                                                        block cotains xattr
                                                        tree. */
	} 
xb_attrs;
};


#define OCFS2_XATTR_ENTRY_LOCAL		0x80

#define OCFS2_XATTR_TYPE_MASK		0x7F

static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe, int local) { if (local) xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL; else xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL; }

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static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe) { return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL; }

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static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type) { xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK; }

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static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe) { return xe->xe_type & OCFS2_XATTR_TYPE_MASK; }

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/* * On disk structures for global quota file */ /* Magic numbers and known versions for global quota files */ #define OCFS2_GLOBAL_QMAGICS {\ 0x0cf52470, /* USRQUOTA */ \ 0x0cf52471 /* GRPQUOTA */ \ } #define OCFS2_GLOBAL_QVERSIONS {\ 0, \ 0, \ } /* Each block of each quota file has a certain fixed number of bytes reserved * for OCFS2 internal use at its end. OCFS2 can use it for things like * checksums, etc. */ #define OCFS2_QBLK_RESERVED_SPACE 8 /* Generic header of all quota files */ struct ocfs2_disk_dqheader { __le32 dqh_magic; /* Magic number identifying file */ __le32 dqh_version; /* Quota format version */ }; #define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) /* Information header of global quota file (immediately follows the generic * header) */ struct ocfs2_global_disk_dqinfo { /*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */ __le32 dqi_igrace; /* Grace time for inode softlimit excess */ __le32 dqi_syncms; /* Time after which we sync local changes to * global quota file */ __le32 dqi_blocks; /* Number of blocks in quota file */ /*10*/ __le32 dqi_free_blk; /* First free block in quota file */ __le32 dqi_free_entry; /* First block with free dquot entry in quota * file */ }; /* Structure with global user / group information. We reserve some space * for future use. */ struct ocfs2_global_disk_dqblk { /*00*/ __le32 dqb_id; /* ID the structure belongs to */ __le32 dqb_use_count; /* Number of nodes having reference to this structure */ __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */ /*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */ __le64 dqb_curinodes; /* current # allocated inodes */ /*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */ __le64 dqb_bsoftlimit; /* preferred limit on disk space */ /*30*/ __le64 dqb_curspace; /* current space occupied */ __le64 dqb_btime; /* time limit for excessive disk use */ /*40*/ __le64 dqb_itime; /* time limit for excessive inode use */ __le64 dqb_pad1; /*50*/ __le64 dqb_pad2; }; /* * On-disk structures for local quota file */ /* Magic numbers and known versions for local quota files */ #define OCFS2_LOCAL_QMAGICS {\ 0x0cf524c0, /* USRQUOTA */ \ 0x0cf524c1 /* GRPQUOTA */ \ } #define OCFS2_LOCAL_QVERSIONS {\ 0, \ 0, \ } /* Quota flags in dqinfo header */ #define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\ * quota has been cleanly turned off) */ #define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) /* Information header of local quota file (immediately follows the generic * header) */ struct ocfs2_local_disk_dqinfo { __le32 dqi_flags; /* Flags for quota file */ __le32 dqi_chunks; /* Number of chunks of quota structures * with a bitmap */ __le32 dqi_blocks; /* Number of blocks allocated for quota file */ }; /* Header of one chunk of a quota file */ struct ocfs2_local_disk_chunk { __le32 dqc_free; /* Number of free entries in the bitmap */ __u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding * chunk of quota file */ }; /* One entry in local quota file */ struct ocfs2_local_disk_dqblk { /*00*/ __le64 dqb_id; /* id this quota applies to */ __le64 dqb_spacemod; /* Change in the amount of used space */ /*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */ }; /* * The quota trailer lives at the end of each quota block. */ struct ocfs2_disk_dqtrailer { /*00*/ struct ocfs2_block_check dq_check; /* Error checking */ /*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */ };
static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize, void *buf) { char *ptr = buf; ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE; return (struct ocfs2_disk_dqtrailer *)ptr; }

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Joel Becker36100.00%1100.00%
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#ifdef __KERNEL__
static inline int ocfs2_fast_symlink_chars(struct super_block *sb) { return sb->s_blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); }

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Mark Fasheh27100.00%1100.00%
Total27100.00%1100.00%


static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb, struct ocfs2_dinode *di) { unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) return sb->s_blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data) - xattrsize; else return sb->s_blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data); }

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Tiger Yang76100.00%1100.00%
Total76100.00%1100.00%


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); }

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Mark Fasheh42100.00%1100.00%
Total42100.00%1100.00%


static inline int ocfs2_extent_recs_per_inode_with_xattr( struct super_block *sb, struct ocfs2_dinode *di) { int size; unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) size = sb->s_blocksize - offsetof(struct ocfs2_dinode, id2.i_list.l_recs) - xattrsize; else size = sb->s_blocksize - offsetof(struct ocfs2_dinode, id2.i_list.l_recs); return size / sizeof(struct ocfs2_extent_rec); }

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Tiger Yang90100.00%1100.00%
Total90100.00%1100.00%


static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb) { int size; size = sb->s_blocksize - offsetof(struct ocfs2_dx_root_block, dr_list.l_recs); return size / sizeof(struct ocfs2_extent_rec); }

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Mark Fasheh40100.00%1100.00%
Total40100.00%1100.00%


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); }

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Mark Fasheh42100.00%1100.00%
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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); }

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Mark Fasheh40100.00%1100.00%
Total40100.00%1100.00%


static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb) { int size; size = sb->s_blocksize - offsetof(struct ocfs2_group_desc, bg_list.l_recs); return size / sizeof(struct ocfs2_extent_rec); }

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Joel Becker40100.00%1100.00%
Total40100.00%1100.00%


static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb) { int size; size = sb->s_blocksize - offsetof(struct ocfs2_dx_leaf, dl_list.de_entries); return size / sizeof(struct ocfs2_dx_entry); }

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Mark Fasheh40100.00%1100.00%
Total40100.00%1100.00%


static inline int ocfs2_dx_entries_per_root(struct super_block *sb) { int size; size = sb->s_blocksize - offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries); return size / sizeof(struct ocfs2_dx_entry); }

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Mark Fasheh40100.00%1100.00%
Total40100.00%1100.00%


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; }

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Mark Fasheh36100.00%1100.00%
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static inline int ocfs2_group_bitmap_size(struct super_block *sb, int suballocator, u32 feature_incompat) { int size = sb->s_blocksize - offsetof(struct ocfs2_group_desc, bg_bitmap); /* * The cluster allocator uses the entire block. Suballocators have * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older * code expects bg_size set to the maximum. Thus we must keep * bg_size as-is unless discontig_bg is enabled. */ if (suballocator && (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)) size = OCFS2_MAX_BG_BITMAP_SIZE; return size; }

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Mark Fasheh2956.86%133.33%
Tao Ma1937.25%133.33%
Joel Becker35.88%133.33%
Total51100.00%3100.00%


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); }

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Mark Fasheh42100.00%1100.00%
Total42100.00%1100.00%


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; }

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Mark Fasheh52100.00%2100.00%
Total52100.00%2100.00%


static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb) { int size; size = sb->s_blocksize - offsetof(struct ocfs2_xattr_block, xb_attrs.xb_root.xt_list.l_recs); return size / sizeof(struct ocfs2_extent_rec); }

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Tao Ma44100.00%1100.00%
Total44100.00%1100.00%


static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb) { int size; size = sb->s_blocksize - offsetof(struct ocfs2_refcount_block, rf_list.l_recs); return size / sizeof(struct ocfs2_extent_rec); }

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Tao Ma40100.00%1100.00%
Total40100.00%1100.00%


static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb) { int size; size = sb->s_blocksize - offsetof(struct ocfs2_refcount_block, rf_records.rl_recs); return size / sizeof(struct ocfs2_refcount_rec); }

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Tao Ma40100.00%1100.00%
Total40100.00%1100.00%


static inline u32 ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec) { return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK; }

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Tao Ma23100.00%1100.00%
Total23100.00%1100.00%

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

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Mark Fasheh23100.00%2100.00%
Total23100.00%2100.00%


static inline int ocfs2_max_inline_data_with_xattr(int blocksize, struct ocfs2_dinode *di) { if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL)) return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data) - di->i_xattr_inline_size; else return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data); }

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Tao Ma3861.29%133.33%
Mark Fasheh2438.71%266.67%
Total62100.00%3100.00%


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); }

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Mark Fasheh38100.00%1100.00%
Total38100.00%1100.00%


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); }

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Mark Fasheh38100.00%1100.00%
Total38100.00%1100.00%


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); }

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Mark Fasheh36100.00%1100.00%
Total36100.00%1100.00%


static inline int ocfs2_extent_recs_per_gd(int blocksize) { int size; size = blocksize - offsetof(struct ocfs2_group_desc, bg_list.l_recs); return size / sizeof(struct ocfs2_extent_rec); }

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Joel Becker36100.00%1100.00%
Total36100.00%1100.00%


static inline int ocfs2_local_alloc_size(int blocksize) { int size; size = blocksize - offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); return size; }

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Mark Fasheh32100.00%1100.00%
Total32100.00%1100.00%


static inline int ocfs2_group_bitmap_size(int blocksize, int suballocator, uint32_t feature_incompat) { int size = sb->s_blocksize - offsetof(struct ocfs2_group_desc, bg_bitmap); /* * The cluster allocator uses the entire block. Suballocators have * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older * code expects bg_size set to the maximum. Thus we must keep * bg_size as-is unless discontig_bg is enabled. */ if (suballocator && (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)) size = OCFS2_MAX_BG_BITMAP_SIZE; return size; }

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Mark Fasheh2448.98%133.33%
Tao Ma2244.90%133.33%
Joel Becker36.12%133.33%
Total49100.00%3100.00%


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); }

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Mark Fasheh38100.00%1100.00%
Total38100.00%1100.00%


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; }

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Mark Fasheh48100.00%1100.00%
Total48100.00%1100.00%


static inline int ocfs2_xattr_recs_per_xb(int blocksize) { int size; size = blocksize - offsetof(struct ocfs2_xattr_block, xb_attrs.xb_root.xt_list.l_recs); return size / sizeof(struct ocfs2_extent_rec); }

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Tao Ma40100.00%1100.00%
Total40100.00%1100.00%

#endif /* __KERNEL__ */
static inline int ocfs2_system_inode_is_global(int type) { return ((type >= 0) && (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); }

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Mark Fasheh25100.00%1100.00%
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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; }

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Mark Fasheh6897.14%150.00%
Joel Becker22.86%150.00%
Total70100.00%2100.00%


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]; }

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Mark Fasheh30100.00%1100.00%
Total30100.00%1100.00%


static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd) { if ((offsetof(struct ocfs2_group_desc, bg_bitmap) + le16_to_cpu(gd->bg_size)) != offsetof(struct ocfs2_group_desc, bg_list)) return 0; /* * Only valid to check l_next_free_rec if * bg_bitmap + bg_size == bg_list. */ if (!gd->bg_list.l_next_free_rec) return 0; return 1; }

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Tao Ma58100.00%1100.00%
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#endif /* _OCFS2_FS_H */

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Mark Fasheh250457.82%1629.63%
Tao Ma86620.00%1120.37%
Joel Becker3357.73%1018.52%
Jan Kara2846.56%23.70%
Tiger Yang2205.08%47.41%
Herbert Pötzl501.15%11.85%
Sunil Mushran491.13%47.41%
Joseph Qi160.37%11.85%
Lucas De Marchi30.07%23.70%
Masahiro Yamada20.05%11.85%
Zhonghua Guo10.02%11.85%
Coly Li10.02%11.85%
Total4331100.00%54100.00%
Directory: fs/ocfs2
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