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ocfs2_fs.h
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ocfs2_fs.h
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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* ocfs2_fs.h
*
* On-disk structures for OCFS2.
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License, version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef _OCFS2_FS_H
#define _OCFS2_FS_H
/* Version */
#define OCFS2_MAJOR_REV_LEVEL 0
#define OCFS2_MINOR_REV_LEVEL 90
/*
* An OCFS2 volume starts this way:
* Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
* Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
* Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
*
* All other structures are found from the superblock information.
*
* OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a
* blocksize of 2K, it is 4096 bytes into disk.
*/
#define OCFS2_SUPER_BLOCK_BLKNO 2
/*
* Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
* grow if needed.
*/
#define OCFS2_MIN_CLUSTERSIZE 4096
#define OCFS2_MAX_CLUSTERSIZE 1048576
/*
* Blocks cannot be bigger than clusters, so the maximum blocksize is the
* minimum cluster size.
*/
#define OCFS2_MIN_BLOCKSIZE 512
#define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE
/* Filesystem magic number */
#define OCFS2_SUPER_MAGIC 0x7461636f
/* Object signatures */
#define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2"
#define OCFS2_INODE_SIGNATURE "INODE01"
#define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01"
#define OCFS2_GROUP_DESC_SIGNATURE "GROUP01"
#define OCFS2_XATTR_BLOCK_SIGNATURE "XATTR01"
#define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1"
/* 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)
#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
/* Metadata checksum and error correction */
#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
/*
* 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 */
/*
* 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)
/* Inode attributes, keep in sync with EXT2 */
#define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */
#define OCFS2_UNRM_FL (0x00000002) /* Undelete */
#define OCFS2_COMPR_FL (0x00000004) /* Compress file */
#define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */
#define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */
#define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */
#define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */
#define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */
#define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */
#define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */
#define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */
/*
* Extent record flags (e_node.leaf.flags)
*/
#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
* unwritten */
/*
* ioctl commands
*/
#define OCFS2_IOC_GETFLAGS _IOR('f', 1, long)
#define OCFS2_IOC_SETFLAGS _IOW('f', 2, long)
#define OCFS2_IOC32_GETFLAGS _IOR('f', 1, int)
#define OCFS2_IOC32_SETFLAGS _IOW('f', 2, int)
/*
* Space reservation / allocation / free ioctls and argument structure
* are designed to be compatible with XFS.
*
* ALLOCSP* and FREESP* are not and will never be supported, but are
* included here for completeness.
*/
struct ocfs2_space_resv {
__s16 l_type;
__s16 l_whence;
__s64 l_start;
__s64 l_len; /* len == 0 means until end of file */
__s32 l_sysid;
__u32 l_pid;
__s32 l_pad[4]; /* reserve area */
};
#define OCFS2_IOC_ALLOCSP _IOW ('X', 10, struct ocfs2_space_resv)
#define OCFS2_IOC_FREESP _IOW ('X', 11, struct ocfs2_space_resv)
#define OCFS2_IOC_RESVSP _IOW ('X', 40, struct ocfs2_space_resv)
#define OCFS2_IOC_UNRESVSP _IOW ('X', 41, struct ocfs2_space_resv)
#define OCFS2_IOC_ALLOCSP64 _IOW ('X', 36, struct ocfs2_space_resv)
#define OCFS2_IOC_FREESP64 _IOW ('X', 37, struct ocfs2_space_resv)
#define OCFS2_IOC_RESVSP64 _IOW ('X', 42, struct ocfs2_space_resv)
#define OCFS2_IOC_UNRESVSP64 _IOW ('X', 43, struct ocfs2_space_resv)
/* Used to pass group descriptor data when online resize is done */
struct ocfs2_new_group_input {
__u64 group; /* Group descriptor's blkno. */
__u32 clusters; /* Total number of clusters in this group */
__u32 frees; /* Total free clusters in this group */
__u16 chain; /* Chain for this group */
__u16 reserved1;
__u32 reserved2;
};
#define OCFS2_IOC_GROUP_EXTEND _IOW('o', 1, int)
#define OCFS2_IOC_GROUP_ADD _IOW('o', 2,struct ocfs2_new_group_input)
#define OCFS2_IOC_GROUP_ADD64 _IOW('o', 3,struct ocfs2_new_group_input)
/*
* 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 alternate, userspace stack fields */
#define OCFS2_STACK_LABEL_LEN 4
#define OCFS2_CLUSTER_NAME_LEN 16
/* Journal limits (in bytes) */
#define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
/*
* Default local alloc size (in megabytes)
*
* The value chosen should be such that most allocations, including new
* block groups, use local alloc.
*/
#define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE 8
/*
* Inline extended attribute size (in bytes)
* The value chosen should be aligned to 16 byte boundaries.
*/
#define OCFS2_MIN_XATTR_INLINE_SIZE 256
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
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,
NUM_SYSTEM_INODES
};
static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
/* Global system inodes (single copy) */
/* The first two are only used from userspace mfks/tunefs */
[BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 },
[GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
/* These are used by the running filesystem */
[SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 },
[HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
[GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 },
[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"
/*
* OCFS2 directory file types. Only the low 3 bits are used. The
* other bits are reserved for now.
*/
#define OCFS2_FT_UNKNOWN 0
#define OCFS2_FT_REG_FILE 1
#define OCFS2_FT_DIR 2
#define OCFS2_FT_CHRDEV 3
#define OCFS2_FT_BLKDEV 4
#define OCFS2_FT_FIFO 5
#define OCFS2_FT_SOCK 6
#define OCFS2_FT_SYMLINK 7
#define OCFS2_FT_MAX 8
/*
* OCFS2_DIR_PAD defines the directory entries boundaries
*
* NOTE: It must be a multiple of 4
*/
#define OCFS2_DIR_PAD 4
#define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
#define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
#define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
OCFS2_DIR_ROUND) & \
~OCFS2_DIR_ROUND)
#define OCFS2_LINK_MAX 32000
#define S_SHIFT 12
static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
[S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
[S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
[S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
[S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
[S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
[S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
[S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
};
/*
* Convenience casts
*/
#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
/*
* 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 dependant
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_reserved3;
__le64 h_next_leaf_blk; /* Offset on disk, in blocks,
of next leaf header pointing
to data */
/*30*/ struct ocfs2_extent_list h_list; /* Extent record list */
/* Actual on-disk size is one block */
};
/*
* On disk 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;
/*10*/
};
/*
* 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)
*/
};
struct ocfs2_cluster_info {
/*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN];
__le32 ci_reserved;
/*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; /* Selected userspace
stack. Only valid
with INCOMPAT flag. */
/*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size
for this fs*/
__le16 s_reserved0;
__le32 s_reserved1;
/*C0*/ __le64 s_reserved2[16]; /* 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_reserved0;
__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_reserved2[6];
/*B8*/ union {
__le64 i_pad1; /* Generic way to refer to this
64bit union */
struct {
__le64 i_rdev; /* Device number */
} dev1;
struct { /* Info for bitmap system
inodes */
__le32 i_used; /* Bits (ie, clusters) used */
__le32 i_total; /* Total bits (clusters)
available */
} bitmap1;
struct { /* Info for journal system
inodes */
__le32 ij_flags; /* Mounted, version, etc. */
__le32 ij_recovery_generation; /* Incremented when the
journal is recovered
after an unclean
shutdown */
} journal1;
} id1; /* Inode type dependant 1 */
/*C0*/ union {
struct ocfs2_super_block i_super;
struct ocfs2_local_alloc i_lab;
struct ocfs2_chain_list i_chain;
struct ocfs2_extent_list i_list;
struct ocfs2_truncate_log i_dealloc;
struct ocfs2_inline_data i_data;
__u8 i_symlink[0];
} id2;
/* Actual on-disk size is one block */
};
/*
* On-disk directory entry structure for OCFS2
*
* Packed as this structure could be accessed unaligned on 64-bit platforms
*/
struct ocfs2_dir_entry {
/*00*/ __le64 inode; /* Inode number */
__le16 rec_len; /* Directory entry length */
__u8 name_len; /* Name length */
__u8 file_type;
/*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */
/* Actual on-disk length specified by rec_len */
} __attribute__ ((packed));
/*
* Per-block record for the unindexed directory btree. This is carefully
* crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
* mirrored. That way, the directory manipulation code needs a minimal amount
* of update.
*
* NOTE: Keep this structure aligned to a multiple of 4 bytes.
*/
struct ocfs2_dir_block_trailer {
/*00*/ __le64 db_compat_inode; /* Always zero. Was inode */
__le16 db_compat_rec_len; /* Backwards compatible with
* ocfs2_dir_entry. */
__u8 db_compat_name_len; /* Always zero. Was name_len */
__u8 db_reserved0;
__le16 db_reserved1;
__le16 db_free_rec_len; /* Size of largest empty hole
* in this block. (unused) */
/*10*/ __u8 db_signature[8]; /* Signature for verification */
__le64 db_reserved2;
__le64 db_free_next; /* Next block in list (unused) */
/*20*/ __le64 db_blkno; /* Offset on disk, in blocks */
__le64 db_parent_dinode; /* dinode which owns me, in
blocks */
/*30*/ __le64 db_check; /* Error checking */
/*40*/
};
/*
* 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*/ __u8 bg_bitmap[0];
};
/*
* 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, does'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_reserved2;
/*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;
};