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 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * ocfs2_fs.h
  *
  * On-disk structures for OCFS2.
  *
  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  */
 
 #ifndef _OCFS2_FS_H
 #define _OCFS2_FS_H
 
 #include <linux/magic.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
 
 /* 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      ((u16)-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,
 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE GLOBAL_INODE_ALLOC_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_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)
 
 
 /*
  * 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[];   /* 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[];   /* 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[];    /* 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[];
 };
 
 /*
  * 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[];  /* 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;
 /*20*/  __le64      db_free_next;       /* Next block in list (unused) */
     __le64      db_blkno;       /* Offset on disk, in blocks */
 /*30*/  __le64      db_parent_dinode;   /* dinode which owns me, in
                            blocks */
     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[];   /* 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[];    /* 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[]; /* 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;
 }
 
 static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
 {
     return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
 }
 
 static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
 {
     xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
 }
 
 static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
 {
     return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
 }
 
 /*
  *  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[];  /* 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;
 }
 
 #ifdef __KERNEL__
 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 {
     return  sb->s_blocksize -
          offsetof(struct ocfs2_dinode, id2.i_symlink);
 }
 
 static inline int ocfs2_max_inline_data_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);
 }
 
 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_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);
 }
 
 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);
 }
 
 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_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);
 }
 
 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);
 }
 
 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);
 }
 
 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 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;
 }
 
 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 {
     int size;
 
     size = sb->s_blocksize -
         offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 
     return size / sizeof(struct ocfs2_truncate_rec);
 }
 
 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
 {
     u64 offset = OCFS2_BACKUP_SB_START;
 
     if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
         offset <<= (2 * index);
         offset >>= sb->s_blocksize_bits;
         return offset;
     }
 
     return 0;
 
 }
 
 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);
 }
 
 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);
 }
 
 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);
 }
 
 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;
 }
 #else
 static inline int ocfs2_fast_symlink_chars(int blocksize)
 {
     return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
 }
 
 static inline int ocfs2_max_inline_data_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);
 }
 
 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_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);
 }
 
 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 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;
 }
 
 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
 {
     int size;
 
     size = blocksize -
         offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 
     return size / sizeof(struct ocfs2_truncate_rec);
 }
 
 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
 {
     uint64_t offset = OCFS2_BACKUP_SB_START;
 
     if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
         offset <<= (2 * index);
         offset /= blocksize;
         return offset;
     }
 
     return 0;
 }
 
 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);
 }
 #endif  /* __KERNEL__ */
 
 
 static inline int ocfs2_system_inode_is_global(int type)
 {
     return ((type >= 0) &&
         (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
 }
 
 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
                           int type, int slot)
 {
     int chars;
 
         /*
          * Global system inodes can only have one copy.  Everything
          * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
          * list has a copy per slot.
          */
     if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
         chars = snprintf(buf, len, "%s",
                  ocfs2_system_inodes[type].si_name);
     else
         chars = snprintf(buf, len,
                  ocfs2_system_inodes[type].si_name,
                  slot);
 
     return chars;
 }
 
 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
                     umode_t mode)
 {
     de->file_type = fs_umode_to_ftype(mode);
 }
 
 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;
 }
 #endif  /* _OCFS2_FS_H */
 

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