1594 lines
49 KiB
C
1594 lines
49 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* ocfs2_fs.h
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*
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* On-disk structures for OCFS2.
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License, version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef _OCFS2_FS_H
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#define _OCFS2_FS_H
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/* Version */
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#define OCFS2_MAJOR_REV_LEVEL 0
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#define OCFS2_MINOR_REV_LEVEL 90
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/*
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* An OCFS2 volume starts this way:
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* Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
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* Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
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* Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
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*
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* All other structures are found from the superblock information.
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*
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* OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a
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* blocksize of 2K, it is 4096 bytes into disk.
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*/
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#define OCFS2_SUPER_BLOCK_BLKNO 2
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/*
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* Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
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* grow if needed.
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*/
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#define OCFS2_MIN_CLUSTERSIZE 4096
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#define OCFS2_MAX_CLUSTERSIZE 1048576
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/*
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* Blocks cannot be bigger than clusters, so the maximum blocksize is the
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* minimum cluster size.
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*/
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#define OCFS2_MIN_BLOCKSIZE 512
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#define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE
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/* Filesystem magic number */
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#define OCFS2_SUPER_MAGIC 0x7461636f
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/* Object signatures */
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#define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2"
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#define OCFS2_INODE_SIGNATURE "INODE01"
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#define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01"
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#define OCFS2_GROUP_DESC_SIGNATURE "GROUP01"
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#define OCFS2_XATTR_BLOCK_SIGNATURE "XATTR01"
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#define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1"
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#define OCFS2_DX_ROOT_SIGNATURE "DXDIR01"
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#define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1"
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#define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1"
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/* Compatibility flags */
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#define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \
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( OCFS2_SB(sb)->s_feature_compat & (mask) )
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#define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \
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( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
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#define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \
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( OCFS2_SB(sb)->s_feature_incompat & (mask) )
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#define OCFS2_SET_COMPAT_FEATURE(sb,mask) \
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OCFS2_SB(sb)->s_feature_compat |= (mask)
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#define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \
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OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
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#define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \
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OCFS2_SB(sb)->s_feature_incompat |= (mask)
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#define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \
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OCFS2_SB(sb)->s_feature_compat &= ~(mask)
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#define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
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OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
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#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
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OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
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#define OCFS2_FEATURE_COMPAT_SUPP (OCFS2_FEATURE_COMPAT_BACKUP_SB \
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| OCFS2_FEATURE_COMPAT_JBD2_SB)
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#define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
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| OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
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| OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
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| OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
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| OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
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| OCFS2_FEATURE_INCOMPAT_XATTR \
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| OCFS2_FEATURE_INCOMPAT_META_ECC \
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| OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
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| OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \
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| OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
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#define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
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| OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
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| OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
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/*
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* Heartbeat-only devices are missing journals and other files. The
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* filesystem driver can't load them, but the library can. Never put
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* this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
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*/
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#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002
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/*
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* tunefs sets this incompat flag before starting the resize and clears it
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* at the end. This flag protects users from inadvertently mounting the fs
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* after an aborted run without fsck-ing.
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*/
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#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004
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/* Used to denote a non-clustered volume */
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#define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008
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/* Support for sparse allocation in b-trees */
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#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010
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/*
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* Tunefs sets this incompat flag before starting an operation which
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* would require cleanup on abort. This is done to protect users from
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* inadvertently mounting the fs after an aborted run without
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* fsck-ing.
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*
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* s_tunefs_flags on the super block describes precisely which
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* operations were in progress.
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*/
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#define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020
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/* Support for data packed into inode blocks */
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#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040
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/*
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* Support for alternate, userspace cluster stacks. If set, the superblock
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* field s_cluster_info contains a tag for the alternate stack in use as
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* well as the name of the cluster being joined.
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* mount.ocfs2 must pass in a matching stack name.
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*
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* If not set, the classic stack will be used. This is compatbile with
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* all older versions.
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*/
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#define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080
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/* Support for the extended slot map */
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#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
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/* Support for extended attributes */
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#define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200
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/* Support for indexed directores */
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#define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400
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/* Metadata checksum and error correction */
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#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
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/* Refcount tree support */
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#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
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/* Discontigous block groups */
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#define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000
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/*
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* backup superblock flag is used to indicate that this volume
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* has backup superblocks.
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*/
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#define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
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/*
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* The filesystem will correctly handle journal feature bits.
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*/
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#define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002
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/*
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* Unwritten extents support.
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*/
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#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
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/*
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* Maintain quota information for this filesystem
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*/
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#define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002
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#define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004
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/* The byte offset of the first backup block will be 1G.
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* The following will be 4G, 16G, 64G, 256G and 1T.
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*/
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#define OCFS2_BACKUP_SB_START 1 << 30
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/* the max backup superblock nums */
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#define OCFS2_MAX_BACKUP_SUPERBLOCKS 6
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/*
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* Flags on ocfs2_super_block.s_tunefs_flags
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*/
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#define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */
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/*
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* Flags on ocfs2_dinode.i_flags
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*/
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#define OCFS2_VALID_FL (0x00000001) /* Inode is valid */
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#define OCFS2_UNUSED2_FL (0x00000002)
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#define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */
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#define OCFS2_UNUSED3_FL (0x00000008)
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/* System inode flags */
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#define OCFS2_SYSTEM_FL (0x00000010) /* System inode */
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#define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */
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#define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */
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#define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */
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#define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */
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#define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */
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#define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */
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#define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */
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#define OCFS2_QUOTA_FL (0x00001000) /* Quota file */
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/*
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* Flags on ocfs2_dinode.i_dyn_features
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*
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* These can change much more often than i_flags. When adding flags,
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* keep in mind that i_dyn_features is only 16 bits wide.
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*/
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#define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */
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#define OCFS2_HAS_XATTR_FL (0x0002)
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#define OCFS2_INLINE_XATTR_FL (0x0004)
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#define OCFS2_INDEXED_DIR_FL (0x0008)
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#define OCFS2_HAS_REFCOUNT_FL (0x0010)
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/* Inode attributes, keep in sync with EXT2 */
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#define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */
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#define OCFS2_UNRM_FL (0x00000002) /* Undelete */
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#define OCFS2_COMPR_FL (0x00000004) /* Compress file */
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#define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */
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#define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */
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#define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */
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#define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */
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#define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */
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#define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */
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#define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */
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#define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */
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/*
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* Extent record flags (e_node.leaf.flags)
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*/
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#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
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* unwritten */
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#define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
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* counted in an associated
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* refcount tree */
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/*
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* Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
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*/
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#define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */
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/*
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* superblock s_state flags
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*/
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#define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */
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/* Limit of space in ocfs2_dir_entry */
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#define OCFS2_MAX_FILENAME_LEN 255
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/* Maximum slots on an ocfs2 file system */
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#define OCFS2_MAX_SLOTS 255
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/* Slot map indicator for an empty slot */
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#define OCFS2_INVALID_SLOT -1
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#define OCFS2_VOL_UUID_LEN 16
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#define OCFS2_MAX_VOL_LABEL_LEN 64
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/* The alternate, userspace stack fields */
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#define OCFS2_STACK_LABEL_LEN 4
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#define OCFS2_CLUSTER_NAME_LEN 16
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/* Journal limits (in bytes) */
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#define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
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/*
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* Inline extended attribute size (in bytes)
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* The value chosen should be aligned to 16 byte boundaries.
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*/
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#define OCFS2_MIN_XATTR_INLINE_SIZE 256
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struct ocfs2_system_inode_info {
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char *si_name;
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int si_iflags;
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int si_mode;
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};
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/* System file index */
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enum {
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BAD_BLOCK_SYSTEM_INODE = 0,
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GLOBAL_INODE_ALLOC_SYSTEM_INODE,
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SLOT_MAP_SYSTEM_INODE,
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#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
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HEARTBEAT_SYSTEM_INODE,
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GLOBAL_BITMAP_SYSTEM_INODE,
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USER_QUOTA_SYSTEM_INODE,
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GROUP_QUOTA_SYSTEM_INODE,
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#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
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ORPHAN_DIR_SYSTEM_INODE,
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EXTENT_ALLOC_SYSTEM_INODE,
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INODE_ALLOC_SYSTEM_INODE,
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JOURNAL_SYSTEM_INODE,
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LOCAL_ALLOC_SYSTEM_INODE,
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TRUNCATE_LOG_SYSTEM_INODE,
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LOCAL_USER_QUOTA_SYSTEM_INODE,
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LOCAL_GROUP_QUOTA_SYSTEM_INODE,
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NUM_SYSTEM_INODES
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};
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static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
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/* Global system inodes (single copy) */
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/* The first two are only used from userspace mfks/tunefs */
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[BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 },
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[GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
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/* These are used by the running filesystem */
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[SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 },
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[HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
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[GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 },
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[USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
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[GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 },
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/* Slot-specific system inodes (one copy per slot) */
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[ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
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[EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
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[INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
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[JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
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[LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
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[TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 },
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[LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
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[LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
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};
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/* Parameter passed from mount.ocfs2 to module */
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#define OCFS2_HB_NONE "heartbeat=none"
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#define OCFS2_HB_LOCAL "heartbeat=local"
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/*
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* OCFS2 directory file types. Only the low 3 bits are used. The
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* other bits are reserved for now.
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*/
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#define OCFS2_FT_UNKNOWN 0
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#define OCFS2_FT_REG_FILE 1
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#define OCFS2_FT_DIR 2
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#define OCFS2_FT_CHRDEV 3
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#define OCFS2_FT_BLKDEV 4
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#define OCFS2_FT_FIFO 5
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#define OCFS2_FT_SOCK 6
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#define OCFS2_FT_SYMLINK 7
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#define OCFS2_FT_MAX 8
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/*
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* OCFS2_DIR_PAD defines the directory entries boundaries
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*
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* NOTE: It must be a multiple of 4
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*/
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#define OCFS2_DIR_PAD 4
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#define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
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#define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
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#define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
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OCFS2_DIR_ROUND) & \
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~OCFS2_DIR_ROUND)
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#define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1)
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#define OCFS2_LINK_MAX 32000
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#define OCFS2_DX_LINK_MAX ((1U << 31) - 1U)
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#define OCFS2_LINKS_HI_SHIFT 16
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#define OCFS2_DX_ENTRIES_MAX (0xffffffffU)
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#define S_SHIFT 12
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static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
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[S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
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[S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
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[S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
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[S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
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[S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
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[S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
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[S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
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};
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/*
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* Convenience casts
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*/
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#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
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/*
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* Block checking structure. This is used in metadata to validate the
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* contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
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* 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_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;
|
|
/*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_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*/ __le64 i_reserved2[3];
|
|
/*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*/ 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 discontigous 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, 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_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 */
|
|
|