| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* -*- 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. |
| */ |
| |
| #ifndef _OCFS2_FS_H |
| #define _OCFS2_FS_H |
| |
| #include <linux/magic.h> |
| |
| /* Version */ |
| #define OCFS2_MAJOR_REV_LEVEL 0 |
| #define OCFS2_MINOR_REV_LEVEL 90 |
| |
| /* |
| * An OCFS2 volume starts this way: |
| * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS. |
| * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS. |
| * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock. |
| * |
| * All other structures are found from the superblock information. |
| * |
| * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a |
| * blocksize of 2K, it is 4096 bytes into disk. |
| */ |
| #define OCFS2_SUPER_BLOCK_BLKNO 2 |
| |
| /* |
| * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could |
| * grow if needed. |
| */ |
| #define OCFS2_MIN_CLUSTERSIZE 4096 |
| #define OCFS2_MAX_CLUSTERSIZE 1048576 |
| |
| /* |
| * Blocks cannot be bigger than clusters, so the maximum blocksize is the |
| * minimum cluster size. |
| */ |
| #define OCFS2_MIN_BLOCKSIZE 512 |
| #define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE |
| |
| /* Object signatures */ |
| #define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2" |
| #define OCFS2_INODE_SIGNATURE "INODE01" |
| #define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01" |
| #define OCFS2_GROUP_DESC_SIGNATURE "GROUP01" |
| #define OCFS2_XATTR_BLOCK_SIGNATURE "XATTR01" |
| #define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1" |
| #define OCFS2_DX_ROOT_SIGNATURE "DXDIR01" |
| #define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1" |
| #define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1" |
| |
| /* Compatibility flags */ |
| #define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \ |
| ( OCFS2_SB(sb)->s_feature_compat & (mask) ) |
| #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
| ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) ) |
| #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \ |
| ( OCFS2_SB(sb)->s_feature_incompat & (mask) ) |
| #define OCFS2_SET_COMPAT_FEATURE(sb,mask) \ |
| OCFS2_SB(sb)->s_feature_compat |= (mask) |
| #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \ |
| OCFS2_SB(sb)->s_feature_ro_compat |= (mask) |
| #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \ |
| OCFS2_SB(sb)->s_feature_incompat |= (mask) |
| #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \ |
| OCFS2_SB(sb)->s_feature_compat &= ~(mask) |
| #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ |
| OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask) |
| #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ |
| OCFS2_SB(sb)->s_feature_incompat &= ~(mask) |
| |
| #define OCFS2_FEATURE_COMPAT_SUPP (OCFS2_FEATURE_COMPAT_BACKUP_SB \ |
| | OCFS2_FEATURE_COMPAT_JBD2_SB) |
| #define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \ |
| | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \ |
| | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \ |
| | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \ |
| | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \ |
| | OCFS2_FEATURE_INCOMPAT_XATTR \ |
| | OCFS2_FEATURE_INCOMPAT_META_ECC \ |
| | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \ |
| | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \ |
| | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG \ |
| | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO \ |
| | OCFS2_FEATURE_INCOMPAT_APPEND_DIO) |
| #define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \ |
| | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \ |
| | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA) |
| |
| /* |
| * Heartbeat-only devices are missing journals and other files. The |
| * filesystem driver can't load them, but the library can. Never put |
| * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. |
| */ |
| #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 |
| |
| /* |
| * tunefs sets this incompat flag before starting the resize and clears it |
| * at the end. This flag protects users from inadvertently mounting the fs |
| * after an aborted run without fsck-ing. |
| */ |
| #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004 |
| |
| /* Used to denote a non-clustered volume */ |
| #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008 |
| |
| /* Support for sparse allocation in b-trees */ |
| #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010 |
| |
| /* |
| * Tunefs sets this incompat flag before starting an operation which |
| * would require cleanup on abort. This is done to protect users from |
| * inadvertently mounting the fs after an aborted run without |
| * fsck-ing. |
| * |
| * s_tunefs_flags on the super block describes precisely which |
| * operations were in progress. |
| */ |
| #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020 |
| |
| /* Support for data packed into inode blocks */ |
| #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040 |
| |
| /* |
| * Support for alternate, userspace cluster stacks. If set, the superblock |
| * field s_cluster_info contains a tag for the alternate stack in use as |
| * well as the name of the cluster being joined. |
| * mount.ocfs2 must pass in a matching stack name. |
| * |
| * If not set, the classic stack will be used. This is compatbile with |
| * all older versions. |
| */ |
| #define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080 |
| |
| /* Support for the extended slot map */ |
| #define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100 |
| |
| /* Support for extended attributes */ |
| #define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200 |
| |
| /* Support for indexed directores */ |
| #define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400 |
| |
| /* Metadata checksum and error correction */ |
| #define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800 |
| |
| /* Refcount tree support */ |
| #define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000 |
| |
| /* Discontiguous block groups */ |
| #define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000 |
| |
| /* |
| * Incompat bit to indicate useable clusterinfo with stackflags for all |
| * cluster stacks (userspace adnd o2cb). If this bit is set, |
| * INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set. |
| */ |
| #define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO 0x4000 |
| |
| /* |
| * Append Direct IO support |
| */ |
| #define OCFS2_FEATURE_INCOMPAT_APPEND_DIO 0x8000 |
| |
| /* |
| * backup superblock flag is used to indicate that this volume |
| * has backup superblocks. |
| */ |
| #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001 |
| |
| /* |
| * The filesystem will correctly handle journal feature bits. |
| */ |
| #define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002 |
| |
| /* |
| * Unwritten extents support. |
| */ |
| #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001 |
| |
| /* |
| * Maintain quota information for this filesystem |
| */ |
| #define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002 |
| #define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004 |
| |
| |
| /* The byte offset of the first backup block will be 1G. |
| * The following will be 4G, 16G, 64G, 256G and 1T. |
| */ |
| #define OCFS2_BACKUP_SB_START 1 << 30 |
| |
| /* the max backup superblock nums */ |
| #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6 |
| |
| /* |
| * Flags on ocfs2_super_block.s_tunefs_flags |
| */ |
| #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */ |
| |
| /* |
| * Flags on ocfs2_dinode.i_flags |
| */ |
| #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ |
| #define OCFS2_UNUSED2_FL (0x00000002) |
| #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ |
| #define OCFS2_UNUSED3_FL (0x00000008) |
| /* System inode flags */ |
| #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ |
| #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ |
| #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ |
| #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ |
| #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ |
| #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ |
| #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ |
| #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ |
| #define OCFS2_QUOTA_FL (0x00001000) /* Quota file */ |
| #define OCFS2_DIO_ORPHANED_FL (0X00002000) /* On the orphan list especially |
| * for dio */ |
| |
| /* |
| * Flags on ocfs2_dinode.i_dyn_features |
| * |
| * These can change much more often than i_flags. When adding flags, |
| * keep in mind that i_dyn_features is only 16 bits wide. |
| */ |
| #define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */ |
| #define OCFS2_HAS_XATTR_FL (0x0002) |
| #define OCFS2_INLINE_XATTR_FL (0x0004) |
| #define OCFS2_INDEXED_DIR_FL (0x0008) |
| #define OCFS2_HAS_REFCOUNT_FL (0x0010) |
| |
| /* Inode attributes, keep in sync with EXT2 */ |
| #define OCFS2_SECRM_FL FS_SECRM_FL /* Secure deletion */ |
| #define OCFS2_UNRM_FL FS_UNRM_FL /* Undelete */ |
| #define OCFS2_COMPR_FL FS_COMPR_FL /* Compress file */ |
| #define OCFS2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ |
| #define OCFS2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ |
| #define OCFS2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ |
| #define OCFS2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ |
| #define OCFS2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ |
| /* Reserved for compression usage... */ |
| #define OCFS2_DIRTY_FL FS_DIRTY_FL |
| #define OCFS2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ |
| #define OCFS2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ |
| #define OCFS2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ |
| /* End compression flags --- maybe not all used */ |
| #define OCFS2_BTREE_FL FS_BTREE_FL /* btree format dir */ |
| #define OCFS2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ |
| #define OCFS2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ |
| #define OCFS2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ |
| #define OCFS2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ |
| #define OCFS2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ |
| #define OCFS2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ |
| #define OCFS2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ |
| |
| #define OCFS2_FL_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ |
| #define OCFS2_FL_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ |
| |
| /* |
| * Extent record flags (e_node.leaf.flags) |
| */ |
| #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but |
| * unwritten */ |
| #define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference |
| * counted in an associated |
| * refcount tree */ |
| |
| /* |
| * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) |
| */ |
| #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ |
| |
| /* |
| * superblock s_state flags |
| */ |
| #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ |
| |
| /* Limit of space in ocfs2_dir_entry */ |
| #define OCFS2_MAX_FILENAME_LEN 255 |
| |
| /* Maximum slots on an ocfs2 file system */ |
| #define OCFS2_MAX_SLOTS 255 |
| |
| /* Slot map indicator for an empty slot */ |
| #define OCFS2_INVALID_SLOT -1 |
| |
| #define OCFS2_VOL_UUID_LEN 16 |
| #define OCFS2_MAX_VOL_LABEL_LEN 64 |
| |
| /* The cluster stack fields */ |
| #define OCFS2_STACK_LABEL_LEN 4 |
| #define OCFS2_CLUSTER_NAME_LEN 16 |
| |
| /* Classic (historically speaking) cluster stack */ |
| #define OCFS2_CLASSIC_CLUSTER_STACK "o2cb" |
| |
| /* Journal limits (in bytes) */ |
| #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) |
| |
| /* |
| * Inline extended attribute size (in bytes) |
| * The value chosen should be aligned to 16 byte boundaries. |
| */ |
| #define OCFS2_MIN_XATTR_INLINE_SIZE 256 |
| |
| /* |
| * Cluster info flags (ocfs2_cluster_info.ci_stackflags) |
| */ |
| #define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT (0x01) |
| |
| struct ocfs2_system_inode_info { |
| char *si_name; |
| int si_iflags; |
| int si_mode; |
| }; |
| |
| /* System file index */ |
| enum { |
| BAD_BLOCK_SYSTEM_INODE = 0, |
| GLOBAL_INODE_ALLOC_SYSTEM_INODE, |
| SLOT_MAP_SYSTEM_INODE, |
| #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE |
| HEARTBEAT_SYSTEM_INODE, |
| GLOBAL_BITMAP_SYSTEM_INODE, |
| USER_QUOTA_SYSTEM_INODE, |
| GROUP_QUOTA_SYSTEM_INODE, |
| #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE |
| #define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_SYSTEM_INODE |
| ORPHAN_DIR_SYSTEM_INODE, |
| EXTENT_ALLOC_SYSTEM_INODE, |
| INODE_ALLOC_SYSTEM_INODE, |
| JOURNAL_SYSTEM_INODE, |
| LOCAL_ALLOC_SYSTEM_INODE, |
| TRUNCATE_LOG_SYSTEM_INODE, |
| LOCAL_USER_QUOTA_SYSTEM_INODE, |
| LOCAL_GROUP_QUOTA_SYSTEM_INODE, |
| #define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE |
| NUM_SYSTEM_INODES |
| }; |
| #define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE |
| #define NUM_LOCAL_SYSTEM_INODES \ |
| (NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE) |
| |
| static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { |
| /* Global system inodes (single copy) */ |
| /* The first two are only used from userspace mfks/tunefs */ |
| [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, |
| [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, |
| |
| /* These are used by the running filesystem */ |
| [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, |
| [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, |
| [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, |
| [USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 }, |
| [GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 }, |
| |
| /* Slot-specific system inodes (one copy per slot) */ |
| [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, |
| [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, |
| [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, |
| [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, |
| [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, |
| [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }, |
| [LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 }, |
| [LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 }, |
| }; |
| |
| /* Parameter passed from mount.ocfs2 to module */ |
| #define OCFS2_HB_NONE "heartbeat=none" |
| #define OCFS2_HB_LOCAL "heartbeat=local" |
| #define OCFS2_HB_GLOBAL "heartbeat=global" |
| |
| /* |
| * OCFS2_DIR_PAD defines the directory entries boundaries |
| * |
| * NOTE: It must be a multiple of 4 |
| */ |
| #define OCFS2_DIR_PAD 4 |
| #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) |
| #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) |
| #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ |
| OCFS2_DIR_ROUND) & \ |
| ~OCFS2_DIR_ROUND) |
| #define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1) |
| |
| #define OCFS2_LINK_MAX 32000 |
| #define OCFS2_DX_LINK_MAX ((1U << 31) - 1U) |
| #define OCFS2_LINKS_HI_SHIFT 16 |
| #define OCFS2_DX_ENTRIES_MAX (0xffffffffU) |
| |
| |
| /* |
| * Convenience casts |
| */ |
| #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) |
| |
| /* |
| * Block checking structure. This is used in metadata to validate the |
| * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all |
| * zeros. |
| */ |
| struct ocfs2_block_check { |
| /*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */ |
| __le16 bc_ecc; /* Single-error-correction parity vector. |
| This is a simple Hamming code dependent |
| on the blocksize. OCFS2's maximum |
| blocksize, 4K, requires 16 parity bits, |
| so we fit in __le16. */ |
| __le16 bc_reserved1; |
| /*08*/ |
| }; |
| |
| /* |
| * On disk extent record for OCFS2 |
| * It describes a range of clusters on disk. |
| * |
| * Length fields are divided into interior and leaf node versions. |
| * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes. |
| */ |
| struct ocfs2_extent_rec { |
| /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ |
| union { |
| __le32 e_int_clusters; /* Clusters covered by all children */ |
| struct { |
| __le16 e_leaf_clusters; /* Clusters covered by this |
| extent */ |
| __u8 e_reserved1; |
| __u8 e_flags; /* Extent flags */ |
| }; |
| }; |
| __le64 e_blkno; /* Physical disk offset, in blocks */ |
| /*10*/ |
| }; |
| |
| struct ocfs2_chain_rec { |
| __le32 c_free; /* Number of free bits in this chain. */ |
| __le32 c_total; /* Number of total bits in this chain */ |
| __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ |
| }; |
| |
| struct ocfs2_truncate_rec { |
| __le32 t_start; /* 1st cluster in this log */ |
| __le32 t_clusters; /* Number of total clusters covered */ |
| }; |
| |
| /* |
| * On disk extent list for OCFS2 (node in the tree). Note that this |
| * is contained inside ocfs2_dinode or ocfs2_extent_block, so the |
| * offsets are relative to ocfs2_dinode.id2.i_list or |
| * ocfs2_extent_block.h_list, respectively. |
| */ |
| struct ocfs2_extent_list { |
| /*00*/ __le16 l_tree_depth; /* Extent tree depth from this |
| point. 0 means data extents |
| hang directly off this |
| header (a leaf) |
| NOTE: The high 8 bits cannot be |
| used - tree_depth is never that big. |
| */ |
| __le16 l_count; /* Number of extent records */ |
| __le16 l_next_free_rec; /* Next unused extent slot */ |
| __le16 l_reserved1; |
| __le64 l_reserved2; /* Pad to |
| sizeof(ocfs2_extent_rec) */ |
| /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ |
| }; |
| |
| /* |
| * On disk allocation chain list for OCFS2. Note that this is |
| * contained inside ocfs2_dinode, so the offsets are relative to |
| * ocfs2_dinode.id2.i_chain. |
| */ |
| struct ocfs2_chain_list { |
| /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ |
| __le16 cl_bpc; /* Bits per cluster */ |
| __le16 cl_count; /* Total chains in this list */ |
| __le16 cl_next_free_rec; /* Next unused chain slot */ |
| __le64 cl_reserved1; |
| /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ |
| }; |
| |
| /* |
| * On disk deallocation log for OCFS2. Note that this is |
| * contained inside ocfs2_dinode, so the offsets are relative to |
| * ocfs2_dinode.id2.i_dealloc. |
| */ |
| struct ocfs2_truncate_log { |
| /*00*/ __le16 tl_count; /* Total records in this log */ |
| __le16 tl_used; /* Number of records in use */ |
| __le32 tl_reserved1; |
| /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ |
| }; |
| |
| /* |
| * On disk extent block (indirect block) for OCFS2 |
| */ |
| struct ocfs2_extent_block |
| { |
| /*00*/ __u8 h_signature[8]; /* Signature for verification */ |
| struct ocfs2_block_check h_check; /* Error checking */ |
| /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this |
| extent_header belongs to */ |
| __le16 h_suballoc_bit; /* Bit offset in suballocator |
| block group */ |
| __le32 h_fs_generation; /* Must match super block */ |
| __le64 h_blkno; /* Offset on disk, in blocks */ |
| /*20*/ __le64 h_suballoc_loc; /* Suballocator block group this |
| eb belongs to. Only valid |
| if allocated from a |
| discontiguous block group */ |
| __le64 h_next_leaf_blk; /* Offset on disk, in blocks, |
| of next leaf header pointing |
| to data */ |
| /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ |
| /* Actual on-disk size is one block */ |
| }; |
| |
| /* |
| * On disk slot map for OCFS2. This defines the contents of the "slot_map" |
| * system file. A slot is valid if it contains a node number >= 0. The |
| * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty. |
| */ |
| struct ocfs2_slot_map { |
| /*00*/ __le16 sm_slots[0]; |
| /* |
| * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255, |
| * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize. |
| */ |
| }; |
| |
| struct ocfs2_extended_slot { |
| /*00*/ __u8 es_valid; |
| __u8 es_reserved1[3]; |
| __le32 es_node_num; |
| /*08*/ |
| }; |
| |
| /* |
| * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP |
| * is set. It separates out the valid marker from the node number, and |
| * has room to grow. Unlike the old slot map, this format is defined by |
| * i_size. |
| */ |
| struct ocfs2_slot_map_extended { |
| /*00*/ struct ocfs2_extended_slot se_slots[0]; |
| /* |
| * Actual size is i_size of the slot_map system file. It should |
| * match s_max_slots * sizeof(struct ocfs2_extended_slot) |
| */ |
| }; |
| |
| /* |
| * ci_stackflags is only valid if the incompat bit |
| * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set. |
| */ |
| struct ocfs2_cluster_info { |
| /*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN]; |
| union { |
| __le32 ci_reserved; |
| struct { |
| __u8 ci_stackflags; |
| __u8 ci_reserved1; |
| __u8 ci_reserved2; |
| __u8 ci_reserved3; |
| }; |
| }; |
| /*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN]; |
| /*18*/ |
| }; |
| |
| /* |
| * On disk superblock for OCFS2 |
| * Note that it is contained inside an ocfs2_dinode, so all offsets |
| * are relative to the start of ocfs2_dinode.id2. |
| */ |
| struct ocfs2_super_block { |
| /*00*/ __le16 s_major_rev_level; |
| __le16 s_minor_rev_level; |
| __le16 s_mnt_count; |
| __le16 s_max_mnt_count; |
| __le16 s_state; /* File system state */ |
| __le16 s_errors; /* Behaviour when detecting errors */ |
| __le32 s_checkinterval; /* Max time between checks */ |
| /*10*/ __le64 s_lastcheck; /* Time of last check */ |
| __le32 s_creator_os; /* OS */ |
| __le32 s_feature_compat; /* Compatible feature set */ |
| /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ |
| __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ |
| __le64 s_root_blkno; /* Offset, in blocks, of root directory |
| dinode */ |
| /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system |
| directory dinode */ |
| __le32 s_blocksize_bits; /* Blocksize for this fs */ |
| __le32 s_clustersize_bits; /* Clustersize for this fs */ |
| /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts |
| before tunefs required */ |
| __le16 s_tunefs_flag; |
| __le32 s_uuid_hash; /* hash value of uuid */ |
| __le64 s_first_cluster_group; /* Block offset of 1st cluster |
| * group header */ |
| /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ |
| /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ |
| /*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Only valid if either |
| userspace or clusterinfo |
| INCOMPAT flag set. */ |
| /*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size |
| for this fs*/ |
| __le16 s_reserved0; |
| __le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash. |
| * s_uuid_hash serves as seed[3]. */ |
| /*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */ |
| /*140*/ |
| |
| /* |
| * NOTE: As stated above, all offsets are relative to |
| * ocfs2_dinode.id2, which is at 0xC0 in the inode. |
| * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within |
| * our smallest blocksize, which is 512 bytes. To ensure this, |
| * we reserve the space in s_reserved2. Anything past s_reserved2 |
| * will not be available on the smallest blocksize. |
| */ |
| }; |
| |
| /* |
| * Local allocation bitmap for OCFS2 slots |
| * Note that it exists inside an ocfs2_dinode, so all offsets are |
| * relative to the start of ocfs2_dinode.id2. |
| */ |
| struct ocfs2_local_alloc |
| { |
| /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ |
| __le16 la_size; /* Size of included bitmap, in bytes */ |
| __le16 la_reserved1; |
| __le64 la_reserved2; |
| /*10*/ __u8 la_bitmap[0]; |
| }; |
| |
| /* |
| * Data-in-inode header. This is only used if i_dyn_features has |
| * OCFS2_INLINE_DATA_FL set. |
| */ |
| struct ocfs2_inline_data |
| { |
| /*00*/ __le16 id_count; /* Number of bytes that can be used |
| * for data, starting at id_data */ |
| __le16 id_reserved0; |
| __le32 id_reserved1; |
| __u8 id_data[0]; /* Start of user data */ |
| }; |
| |
| /* |
| * On disk inode for OCFS2 |
| */ |
| struct ocfs2_dinode { |
| /*00*/ __u8 i_signature[8]; /* Signature for validation */ |
| __le32 i_generation; /* Generation number */ |
| __le16 i_suballoc_slot; /* Slot suballocator this inode |
| belongs to */ |
| __le16 i_suballoc_bit; /* Bit offset in suballocator |
| block group */ |
| /*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */ |
| __le16 i_xattr_inline_size; |
| __le32 i_clusters; /* Cluster count */ |
| __le32 i_uid; /* Owner UID */ |
| __le32 i_gid; /* Owning GID */ |
| /*20*/ __le64 i_size; /* Size in bytes */ |
| __le16 i_mode; /* File mode */ |
| __le16 i_links_count; /* Links count */ |
| __le32 i_flags; /* File flags */ |
| /*30*/ __le64 i_atime; /* Access time */ |
| __le64 i_ctime; /* Creation time */ |
| /*40*/ __le64 i_mtime; /* Modification time */ |
| __le64 i_dtime; /* Deletion time */ |
| /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ |
| __le64 i_last_eb_blk; /* Pointer to last extent |
| block */ |
| /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ |
| __le32 i_atime_nsec; |
| __le32 i_ctime_nsec; |
| __le32 i_mtime_nsec; |
| /*70*/ __le32 i_attr; |
| __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL |
| was set in i_flags */ |
| __le16 i_dyn_features; |
| __le64 i_xattr_loc; |
| /*80*/ struct ocfs2_block_check i_check; /* Error checking */ |
| /*88*/ __le64 i_dx_root; /* Pointer to dir index root block */ |
| /*90*/ __le64 i_refcount_loc; |
| __le64 i_suballoc_loc; /* Suballocator block group this |
| inode belongs to. Only valid |
| if allocated from a |
| discontiguous block group */ |
| /*A0*/ __le16 i_dio_orphaned_slot; /* only used for append dio write */ |
| __le16 i_reserved1[3]; |
| __le64 i_reserved2[2]; |
| /*B8*/ union { |
| __le64 i_pad1; /* Generic way to refer to this |
| 64bit union */ |
| struct { |
| __le64 i_rdev; /* Device number */ |
| } dev1; |
| struct { /* Info for bitmap system |
| inodes */ |
| __le32 i_used; /* Bits (ie, clusters) used */ |
| __le32 i_total; /* Total bits (clusters) |
| available */ |
| } bitmap1; |
| struct { /* Info for journal system |
| inodes */ |
| __le32 ij_flags; /* Mounted, version, etc. */ |
| __le32 ij_recovery_generation; /* Incremented when the |
| journal is recovered |
| after an unclean |
| shutdown */ |
| } journal1; |
| } id1; /* Inode type dependent 1 */ |
| /*C0*/ union { |
| struct ocfs2_super_block i_super; |
| struct ocfs2_local_alloc i_lab; |
| struct ocfs2_chain_list i_chain; |
| struct ocfs2_extent_list i_list; |
| struct ocfs2_truncate_log i_dealloc; |
| struct ocfs2_inline_data i_data; |
| __u8 i_symlink[0]; |
| } id2; |
| /* Actual on-disk size is one block */ |
| }; |
| |
| /* |
| * On-disk directory entry structure for OCFS2 |
| * |
| * Packed as this structure could be accessed unaligned on 64-bit platforms |
| */ |
| struct ocfs2_dir_entry { |
| /*00*/ __le64 inode; /* Inode number */ |
| __le16 rec_len; /* Directory entry length */ |
| __u8 name_len; /* Name length */ |
| __u8 file_type; |
| /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ |
| /* Actual on-disk length specified by rec_len */ |
| } __attribute__ ((packed)); |
| |
| /* |
| * Per-block record for the unindexed directory btree. This is carefully |
| * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are |
| * mirrored. That way, the directory manipulation code needs a minimal amount |
| * of update. |
| * |
| * NOTE: Keep this structure aligned to a multiple of 4 bytes. |
| */ |
| struct ocfs2_dir_block_trailer { |
| /*00*/ __le64 db_compat_inode; /* Always zero. Was inode */ |
| |
| __le16 db_compat_rec_len; /* Backwards compatible with |
| * ocfs2_dir_entry. */ |
| __u8 db_compat_name_len; /* Always zero. Was name_len */ |
| __u8 db_reserved0; |
| __le16 db_reserved1; |
| __le16 db_free_rec_len; /* Size of largest empty hole |
| * in this block. (unused) */ |
| /*10*/ __u8 db_signature[8]; /* Signature for verification */ |
| __le64 db_reserved2; |
| /*20*/ __le64 db_free_next; /* Next block in list (unused) */ |
| __le64 db_blkno; /* Offset on disk, in blocks */ |
| /*30*/ __le64 db_parent_dinode; /* dinode which owns me, in |
| blocks */ |
| struct ocfs2_block_check db_check; /* Error checking */ |
| /*40*/ |
| }; |
| |
| /* |
| * A directory entry in the indexed tree. We don't store the full name here, |
| * but instead provide a pointer to the full dirent in the unindexed tree. |
| * |
| * We also store name_len here so as to reduce the number of leaf blocks we |
| * need to search in case of collisions. |
| */ |
| struct ocfs2_dx_entry { |
| __le32 dx_major_hash; /* Used to find logical |
| * cluster in index */ |
| __le32 dx_minor_hash; /* Lower bits used to find |
| * block in cluster */ |
| __le64 dx_dirent_blk; /* Physical block in unindexed |
| * tree holding this dirent. */ |
| }; |
| |
| struct ocfs2_dx_entry_list { |
| __le32 de_reserved; |
| __le16 de_count; /* Maximum number of entries |
| * possible in de_entries */ |
| __le16 de_num_used; /* Current number of |
| * de_entries entries */ |
| struct ocfs2_dx_entry de_entries[0]; /* Indexed dir entries |
| * in a packed array of |
| * length de_num_used */ |
| }; |
| |
| #define OCFS2_DX_FLAG_INLINE 0x01 |
| |
| /* |
| * A directory indexing block. Each indexed directory has one of these, |
| * pointed to by ocfs2_dinode. |
| * |
| * This block stores an indexed btree root, and a set of free space |
| * start-of-list pointers. |
| */ |
| struct ocfs2_dx_root_block { |
| __u8 dr_signature[8]; /* Signature for verification */ |
| struct ocfs2_block_check dr_check; /* Error checking */ |
| __le16 dr_suballoc_slot; /* Slot suballocator this |
| * block belongs to. */ |
| __le16 dr_suballoc_bit; /* Bit offset in suballocator |
| * block group */ |
| __le32 dr_fs_generation; /* Must match super block */ |
| __le64 dr_blkno; /* Offset on disk, in blocks */ |
| __le64 dr_last_eb_blk; /* Pointer to last |
| * extent block */ |
| __le32 dr_clusters; /* Clusters allocated |
| * to the indexed tree. */ |
| __u8 dr_flags; /* OCFS2_DX_FLAG_* flags */ |
| __u8 dr_reserved0; |
| __le16 dr_reserved1; |
| __le64 dr_dir_blkno; /* Pointer to parent inode */ |
| __le32 dr_num_entries; /* Total number of |
| * names stored in |
| * this directory.*/ |
| __le32 dr_reserved2; |
| __le64 dr_free_blk; /* Pointer to head of free |
| * unindexed block list. */ |
| __le64 dr_suballoc_loc; /* Suballocator block group |
| this root belongs to. |
| Only valid if allocated |
| from a discontiguous |
| block group */ |
| __le64 dr_reserved3[14]; |
| union { |
| struct ocfs2_extent_list dr_list; /* Keep this aligned to 128 |
| * bits for maximum space |
| * efficiency. */ |
| struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of |
| * entries. We grow out |
| * to extents if this |
| * gets too big. */ |
| }; |
| }; |
| |
| /* |
| * The header of a leaf block in the indexed tree. |
| */ |
| struct ocfs2_dx_leaf { |
| __u8 dl_signature[8];/* Signature for verification */ |
| struct ocfs2_block_check dl_check; /* Error checking */ |
| __le64 dl_blkno; /* Offset on disk, in blocks */ |
| __le32 dl_fs_generation;/* Must match super block */ |
| __le32 dl_reserved0; |
| __le64 dl_reserved1; |
| struct ocfs2_dx_entry_list dl_list; |
| }; |
| |
| /* |
| * Largest bitmap for a block (suballocator) group in bytes. This limit |
| * does not affect cluster groups (global allocator). Cluster group |
| * bitmaps run to the end of the block. |
| */ |
| #define OCFS2_MAX_BG_BITMAP_SIZE 256 |
| |
| /* |
| * On disk allocator group structure for OCFS2 |
| */ |
| struct ocfs2_group_desc |
| { |
| /*00*/ __u8 bg_signature[8]; /* Signature for validation */ |
| __le16 bg_size; /* Size of included bitmap in |
| bytes. */ |
| __le16 bg_bits; /* Bits represented by this |
| group. */ |
| __le16 bg_free_bits_count; /* Free bits count */ |
| __le16 bg_chain; /* What chain I am in. */ |
| /*10*/ __le32 bg_generation; |
| __le32 bg_reserved1; |
| __le64 bg_next_group; /* Next group in my list, in |
| blocks */ |
| /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in |
| blocks */ |
| __le64 bg_blkno; /* Offset on disk, in blocks */ |
| /*30*/ struct ocfs2_block_check bg_check; /* Error checking */ |
| __le64 bg_reserved2; |
| /*40*/ union { |
| __u8 bg_bitmap[0]; |
| struct { |
| /* |
| * Block groups may be discontiguous when |
| * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set. |
| * The extents of a discontiguous block group are |
| * stored in bg_list. It is a flat list. |
| * l_tree_depth must always be zero. A |
| * discontiguous group is signified by a non-zero |
| * bg_list->l_next_free_rec. Only block groups |
| * can be discontiguous; Cluster groups cannot. |
| * We've never made a block group with more than |
| * 2048 blocks (256 bytes of bg_bitmap). This |
| * codifies that limit so that we can fit bg_list. |
| * bg_size of a discontiguous block group will |
| * be 256 to match bg_bitmap_filler. |
| */ |
| __u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE]; |
| /*140*/ struct ocfs2_extent_list bg_list; |
| }; |
| }; |
| /* Actual on-disk size is one block */ |
| }; |
| |
| struct ocfs2_refcount_rec { |
| /*00*/ __le64 r_cpos; /* Physical offset, in clusters */ |
| __le32 r_clusters; /* Clusters covered by this extent */ |
| __le32 r_refcount; /* Reference count of this extent */ |
| /*10*/ |
| }; |
| #define OCFS2_32BIT_POS_MASK (0xffffffffULL) |
| |
| #define OCFS2_REFCOUNT_LEAF_FL (0x00000001) |
| #define OCFS2_REFCOUNT_TREE_FL (0x00000002) |
| |
| struct ocfs2_refcount_list { |
| /*00*/ __le16 rl_count; /* Maximum number of entries possible |
| in rl_records */ |
| __le16 rl_used; /* Current number of used records */ |
| __le32 rl_reserved2; |
| __le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */ |
| /*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */ |
| }; |
| |
| |
| struct ocfs2_refcount_block { |
| /*00*/ __u8 rf_signature[8]; /* Signature for verification */ |
| __le16 rf_suballoc_slot; /* Slot suballocator this block |
| belongs to */ |
| __le16 rf_suballoc_bit; /* Bit offset in suballocator |
| block group */ |
| __le32 rf_fs_generation; /* Must match superblock */ |
| /*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */ |
| __le64 rf_parent; /* Parent block, only valid if |
| OCFS2_REFCOUNT_LEAF_FL is set in |
| rf_flags */ |
| /*20*/ struct ocfs2_block_check rf_check; /* Error checking */ |
| __le64 rf_last_eb_blk; /* Pointer to last extent block */ |
| /*30*/ __le32 rf_count; /* Number of inodes sharing this |
| refcount tree */ |
| __le32 rf_flags; /* See the flags above */ |
| __le32 rf_clusters; /* clusters covered by refcount tree. */ |
| __le32 rf_cpos; /* cluster offset in refcount tree.*/ |
| /*40*/ __le32 rf_generation; /* generation number. all be the same |
| * for the same refcount tree. */ |
| __le32 rf_reserved0; |
| __le64 rf_suballoc_loc; /* Suballocator block group this |
| refcount block belongs to. Only |
| valid if allocated from a |
| discontiguous block group */ |
| /*50*/ __le64 rf_reserved1[6]; |
| /*80*/ union { |
| struct ocfs2_refcount_list rf_records; /* List of refcount |
| records */ |
| struct ocfs2_extent_list rf_list; /* Extent record list, |
| only valid if |
| OCFS2_REFCOUNT_TREE_FL |
| is set in rf_flags */ |
| }; |
| /* Actual on-disk size is one block */ |
| }; |
| |
| /* |
| * On disk extended attribute structure for OCFS2. |
| */ |
| |
| /* |
| * ocfs2_xattr_entry indicates one extend attribute. |
| * |
| * Note that it can be stored in inode, one block or one xattr bucket. |
| */ |
| struct ocfs2_xattr_entry { |
| __le32 xe_name_hash; /* hash value of xattr prefix+suffix. */ |
| __le16 xe_name_offset; /* byte offset from the 1st entry in the |
| local xattr storage(inode, xattr block or |
| xattr bucket). */ |
| __u8 xe_name_len; /* xattr name len, doesn't include prefix. */ |
| __u8 xe_type; /* the low 7 bits indicate the name prefix |
| * type and the highest bit indicates whether |
| * the EA is stored in the local storage. */ |
| __le64 xe_value_size; /* real xattr value length. */ |
| }; |
| |
| /* |
| * On disk structure for xattr header. |
| * |
| * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in |
| * the local xattr storage. |
| */ |
| struct ocfs2_xattr_header { |
| __le16 xh_count; /* contains the count of how |
| many records are in the |
| local xattr storage. */ |
| __le16 xh_free_start; /* current offset for storing |
| xattr. */ |
| __le16 xh_name_value_len; /* total length of name/value |
| length in this bucket. */ |
| __le16 xh_num_buckets; /* Number of xattr buckets |
| in this extent record, |
| only valid in the first |
| bucket. */ |
| struct ocfs2_block_check xh_check; /* Error checking |
| (Note, this is only |
| used for xattr |
| buckets. A block uses |
| xb_check and sets |
| this field to zero.) */ |
| struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */ |
| }; |
| |
| /* |
| * On disk structure for xattr value root. |
| * |
| * When an xattr's value is large enough, it is stored in an external |
| * b-tree like file data. The xattr value root points to this structure. |
| */ |
| struct ocfs2_xattr_value_root { |
| /*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */ |
| __le32 xr_reserved0; |
| __le64 xr_last_eb_blk; /* Pointer to last extent block */ |
| /*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */ |
| }; |
| |
| /* |
| * On disk structure for xattr tree root. |
| * |
| * It is used when there are too many extended attributes for one file. These |
| * attributes will be organized and stored in an indexed-btree. |
| */ |
| struct ocfs2_xattr_tree_root { |
| /*00*/ __le32 xt_clusters; /* clusters covered by xattr. */ |
| __le32 xt_reserved0; |
| __le64 xt_last_eb_blk; /* Pointer to last extent block */ |
| /*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */ |
| }; |
| |
| #define OCFS2_XATTR_INDEXED 0x1 |
| #define OCFS2_HASH_SHIFT 5 |
| #define OCFS2_XATTR_ROUND 3 |
| #define OCFS2_XATTR_SIZE(size) (((size) + OCFS2_XATTR_ROUND) & \ |
| ~(OCFS2_XATTR_ROUND)) |
| |
| #define OCFS2_XATTR_BUCKET_SIZE 4096 |
| #define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET (OCFS2_XATTR_BUCKET_SIZE \ |
| / OCFS2_MIN_BLOCKSIZE) |
| |
| /* |
| * On disk structure for xattr block. |
| */ |
| struct ocfs2_xattr_block { |
| /*00*/ __u8 xb_signature[8]; /* Signature for verification */ |
| __le16 xb_suballoc_slot; /* Slot suballocator this |
| block belongs to. */ |
| __le16 xb_suballoc_bit; /* Bit offset in suballocator |
| block group */ |
| __le32 xb_fs_generation; /* Must match super block */ |
| /*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */ |
| struct ocfs2_block_check xb_check; /* Error checking */ |
| /*20*/ __le16 xb_flags; /* Indicates whether this block contains |
| real xattr or a xattr tree. */ |
| __le16 xb_reserved0; |
| __le32 xb_reserved1; |
| __le64 xb_suballoc_loc; /* Suballocator block group this |
| xattr block belongs to. Only |
| valid if allocated from a |
| discontiguous block group */ |
| /*30*/ union { |
| struct ocfs2_xattr_header xb_header; /* xattr header if this |
| block contains xattr */ |
| struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this |
| block cotains xattr |
| tree. */ |
| } xb_attrs; |
| }; |
| |
| #define OCFS2_XATTR_ENTRY_LOCAL 0x80 |
| #define OCFS2_XATTR_TYPE_MASK 0x7F |
| static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe, |
| int local) |
| { |
| if (local) |
| xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL; |
| else |
| xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL; |
| } |
| |
| static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe) |
| { |
| return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL; |
| } |
| |
| static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type) |
| { |
| xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK; |
| } |
| |
| static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe) |
| { |
| return xe->xe_type & OCFS2_XATTR_TYPE_MASK; |
| } |
| |
| /* |
| * On disk structures for global quota file |
| */ |
| |
| /* Magic numbers and known versions for global quota files */ |
| #define OCFS2_GLOBAL_QMAGICS {\ |
| 0x0cf52470, /* USRQUOTA */ \ |
| 0x0cf52471 /* GRPQUOTA */ \ |
| } |
| |
| #define OCFS2_GLOBAL_QVERSIONS {\ |
| 0, \ |
| 0, \ |
| } |
| |
| |
| /* Each block of each quota file has a certain fixed number of bytes reserved |
| * for OCFS2 internal use at its end. OCFS2 can use it for things like |
| * checksums, etc. */ |
| #define OCFS2_QBLK_RESERVED_SPACE 8 |
| |
| /* Generic header of all quota files */ |
| struct ocfs2_disk_dqheader { |
| __le32 dqh_magic; /* Magic number identifying file */ |
| __le32 dqh_version; /* Quota format version */ |
| }; |
| |
| #define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) |
| |
| /* Information header of global quota file (immediately follows the generic |
| * header) */ |
| struct ocfs2_global_disk_dqinfo { |
| /*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */ |
| __le32 dqi_igrace; /* Grace time for inode softlimit excess */ |
| __le32 dqi_syncms; /* Time after which we sync local changes to |
| * global quota file */ |
| __le32 dqi_blocks; /* Number of blocks in quota file */ |
| /*10*/ __le32 dqi_free_blk; /* First free block in quota file */ |
| __le32 dqi_free_entry; /* First block with free dquot entry in quota |
| * file */ |
| }; |
| |
| /* Structure with global user / group information. We reserve some space |
| * for future use. */ |
| struct ocfs2_global_disk_dqblk { |
| /*00*/ __le32 dqb_id; /* ID the structure belongs to */ |
| __le32 dqb_use_count; /* Number of nodes having reference to this structure */ |
| __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */ |
| /*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */ |
| __le64 dqb_curinodes; /* current # allocated inodes */ |
| /*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */ |
| __le64 dqb_bsoftlimit; /* preferred limit on disk space */ |
| /*30*/ __le64 dqb_curspace; /* current space occupied */ |
| __le64 dqb_btime; /* time limit for excessive disk use */ |
| /*40*/ __le64 dqb_itime; /* time limit for excessive inode use */ |
| __le64 dqb_pad1; |
| /*50*/ __le64 dqb_pad2; |
| }; |
| |
| /* |
| * On-disk structures for local quota file |
| */ |
| |
| /* Magic numbers and known versions for local quota files */ |
| #define OCFS2_LOCAL_QMAGICS {\ |
| 0x0cf524c0, /* USRQUOTA */ \ |
| 0x0cf524c1 /* GRPQUOTA */ \ |
| } |
| |
| #define OCFS2_LOCAL_QVERSIONS {\ |
| 0, \ |
| 0, \ |
| } |
| |
| /* Quota flags in dqinfo header */ |
| #define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\ |
| * quota has been cleanly turned off) */ |
| |
| #define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) |
| |
| /* Information header of local quota file (immediately follows the generic |
| * header) */ |
| struct ocfs2_local_disk_dqinfo { |
| __le32 dqi_flags; /* Flags for quota file */ |
| __le32 dqi_chunks; /* Number of chunks of quota structures |
| * with a bitmap */ |
| __le32 dqi_blocks; /* Number of blocks allocated for quota file */ |
| }; |
| |
| /* Header of one chunk of a quota file */ |
| struct ocfs2_local_disk_chunk { |
| __le32 dqc_free; /* Number of free entries in the bitmap */ |
| __u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding |
| * chunk of quota file */ |
| }; |
| |
| /* One entry in local quota file */ |
| struct ocfs2_local_disk_dqblk { |
| /*00*/ __le64 dqb_id; /* id this quota applies to */ |
| __le64 dqb_spacemod; /* Change in the amount of used space */ |
| /*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */ |
| }; |
| |
| |
| /* |
| * The quota trailer lives at the end of each quota block. |
| */ |
| |
| struct ocfs2_disk_dqtrailer { |
| /*00*/ struct ocfs2_block_check dq_check; /* Error checking */ |
| /*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */ |
| }; |
| |
| static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize, |
| void *buf) |
| { |
| char *ptr = buf; |
| ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE; |
| |
| return (struct ocfs2_disk_dqtrailer *)ptr; |
| } |
| |
| #ifdef __KERNEL__ |
| static inline int ocfs2_fast_symlink_chars(struct super_block *sb) |
| { |
| return sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_symlink); |
| } |
| |
| static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb, |
| struct ocfs2_dinode *di) |
| { |
| unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); |
| |
| if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) |
| return sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_data.id_data) - |
| xattrsize; |
| else |
| return sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_data.id_data); |
| } |
| |
| static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline int ocfs2_extent_recs_per_inode_with_xattr( |
| struct super_block *sb, |
| struct ocfs2_dinode *di) |
| { |
| int size; |
| unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); |
| |
| if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_list.l_recs) - |
| xattrsize; |
| else |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dx_root_block, dr_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); |
| |
| return size / sizeof(struct ocfs2_chain_rec); |
| } |
| |
| static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_extent_block, h_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_group_desc, bg_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dx_leaf, dl_list.de_entries); |
| |
| return size / sizeof(struct ocfs2_dx_entry); |
| } |
| |
| static inline int ocfs2_dx_entries_per_root(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries); |
| |
| return size / sizeof(struct ocfs2_dx_entry); |
| } |
| |
| static inline u16 ocfs2_local_alloc_size(struct super_block *sb) |
| { |
| u16 size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); |
| |
| return size; |
| } |
| |
| static inline int ocfs2_group_bitmap_size(struct super_block *sb, |
| int suballocator, |
| u32 feature_incompat) |
| { |
| int size = sb->s_blocksize - |
| offsetof(struct ocfs2_group_desc, bg_bitmap); |
| |
| /* |
| * The cluster allocator uses the entire block. Suballocators have |
| * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older |
| * code expects bg_size set to the maximum. Thus we must keep |
| * bg_size as-is unless discontig_bg is enabled. |
| */ |
| if (suballocator && |
| (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)) |
| size = OCFS2_MAX_BG_BITMAP_SIZE; |
| |
| return size; |
| } |
| |
| static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); |
| |
| return size / sizeof(struct ocfs2_truncate_rec); |
| } |
| |
| static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) |
| { |
| u64 offset = OCFS2_BACKUP_SB_START; |
| |
| if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { |
| offset <<= (2 * index); |
| offset >>= sb->s_blocksize_bits; |
| return offset; |
| } |
| |
| return 0; |
| |
| } |
| |
| static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_xattr_block, |
| xb_attrs.xb_root.xt_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_refcount_block, rf_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb) |
| { |
| int size; |
| |
| size = sb->s_blocksize - |
| offsetof(struct ocfs2_refcount_block, rf_records.rl_recs); |
| |
| return size / sizeof(struct ocfs2_refcount_rec); |
| } |
| |
| static inline u32 |
| ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec) |
| { |
| return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK; |
| } |
| #else |
| static inline int ocfs2_fast_symlink_chars(int blocksize) |
| { |
| return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); |
| } |
| |
| static inline int ocfs2_max_inline_data_with_xattr(int blocksize, |
| struct ocfs2_dinode *di) |
| { |
| if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL)) |
| return blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_data.id_data) - |
| di->i_xattr_inline_size; |
| else |
| return blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_data.id_data); |
| } |
| |
| static inline int ocfs2_extent_recs_per_inode(int blocksize) |
| { |
| int size; |
| |
| size = blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline int ocfs2_chain_recs_per_inode(int blocksize) |
| { |
| int size; |
| |
| size = blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); |
| |
| return size / sizeof(struct ocfs2_chain_rec); |
| } |
| |
| static inline int ocfs2_extent_recs_per_eb(int blocksize) |
| { |
| int size; |
| |
| size = blocksize - |
| offsetof(struct ocfs2_extent_block, h_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline int ocfs2_extent_recs_per_gd(int blocksize) |
| { |
| int size; |
| |
| size = blocksize - |
| offsetof(struct ocfs2_group_desc, bg_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| |
| static inline int ocfs2_local_alloc_size(int blocksize) |
| { |
| int size; |
| |
| size = blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); |
| |
| return size; |
| } |
| |
| static inline int ocfs2_group_bitmap_size(int blocksize, |
| int suballocator, |
| uint32_t feature_incompat) |
| { |
| int size = sb->s_blocksize - |
| offsetof(struct ocfs2_group_desc, bg_bitmap); |
| |
| /* |
| * The cluster allocator uses the entire block. Suballocators have |
| * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older |
| * code expects bg_size set to the maximum. Thus we must keep |
| * bg_size as-is unless discontig_bg is enabled. |
| */ |
| if (suballocator && |
| (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)) |
| size = OCFS2_MAX_BG_BITMAP_SIZE; |
| |
| return size; |
| } |
| |
| static inline int ocfs2_truncate_recs_per_inode(int blocksize) |
| { |
| int size; |
| |
| size = blocksize - |
| offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); |
| |
| return size / sizeof(struct ocfs2_truncate_rec); |
| } |
| |
| static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) |
| { |
| uint64_t offset = OCFS2_BACKUP_SB_START; |
| |
| if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { |
| offset <<= (2 * index); |
| offset /= blocksize; |
| return offset; |
| } |
| |
| return 0; |
| } |
| |
| static inline int ocfs2_xattr_recs_per_xb(int blocksize) |
| { |
| int size; |
| |
| size = blocksize - |
| offsetof(struct ocfs2_xattr_block, |
| xb_attrs.xb_root.xt_list.l_recs); |
| |
| return size / sizeof(struct ocfs2_extent_rec); |
| } |
| #endif /* __KERNEL__ */ |
| |
| |
| static inline int ocfs2_system_inode_is_global(int type) |
| { |
| return ((type >= 0) && |
| (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); |
| } |
| |
| static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, |
| int type, int slot) |
| { |
| int chars; |
| |
| /* |
| * Global system inodes can only have one copy. Everything |
| * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode |
| * list has a copy per slot. |
| */ |
| if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) |
| chars = snprintf(buf, len, "%s", |
| ocfs2_system_inodes[type].si_name); |
| else |
| chars = snprintf(buf, len, |
| ocfs2_system_inodes[type].si_name, |
| slot); |
| |
| return chars; |
| } |
| |
| static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, |
| umode_t mode) |
| { |
| de->file_type = fs_umode_to_ftype(mode); |
| } |
| |
| static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd) |
| { |
| if ((offsetof(struct ocfs2_group_desc, bg_bitmap) + |
| le16_to_cpu(gd->bg_size)) != |
| offsetof(struct ocfs2_group_desc, bg_list)) |
| return 0; |
| /* |
| * Only valid to check l_next_free_rec if |
| * bg_bitmap + bg_size == bg_list. |
| */ |
| if (!gd->bg_list.l_next_free_rec) |
| return 0; |
| return 1; |
| } |
| #endif /* _OCFS2_FS_H */ |
| |