v4.19.13 snapshot.
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
new file mode 100644
index 0000000..7071ad0
--- /dev/null
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -0,0 +1,1650 @@
+/* -*- 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
+
+#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 -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;
+/*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[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;
+}
+
+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[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;
+}
+
+#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 = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
+}
+
+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 */
+