/* SPDX-License-Identifier: GPL-2.0-only */ /* * ocfs2_fs.h * * On-disk structures for OCFS2. * * Copyright (C) 2002, 2004 Oracle. All rights reserved.
*/
#ifndef _OCFS2_FS_H #define _OCFS2_FS_H
#include <linux/magic.h>
/* Version */ #define OCFS2_MAJOR_REV_LEVEL 0 #define OCFS2_MINOR_REV_LEVEL 90
/* * An OCFS2 volume starts this way: * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS. * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS. * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock. * * All other structures are found from the superblock information. * * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a * blocksize of 2K, it is 4096 bytes into disk.
*/ #define OCFS2_SUPER_BLOCK_BLKNO 2
/* * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could * grow if needed.
*/ #define OCFS2_MIN_CLUSTERSIZE 4096 #define OCFS2_MAX_CLUSTERSIZE 1048576
/* * Blocks cannot be bigger than clusters, so the maximum blocksize is the * minimum cluster size.
*/ #define OCFS2_MIN_BLOCKSIZE 512 #define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE
/* * 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 compatible 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 directories */ #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 usable 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
/* * 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 */
staticstruct 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 },
/* * Block checking structure. This is used in metadata to validate the * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all * zeros.
*/ struct ocfs2_block_check { /*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */
__le16 bc_ecc; /* Single-error-correction parity vector. This is a simple Hamming code dependent on the blocksize. OCFS2's maximum blocksize, 4K, requires 16 parity bits,
so we fit in __le16. */
__le16 bc_reserved1; /*08*/
};
/* * On disk extent record for OCFS2 * It describes a range of clusters on disk. * * Length fields are divided into interior and leaf node versions. * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
*/ struct ocfs2_extent_rec { /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ union {
__le32 e_int_clusters; /* Clusters covered by all children */ struct {
__le16 e_leaf_clusters; /* Clusters covered by this
extent */
__u8 e_reserved1;
__u8 e_flags; /* Extent flags */
};
};
__le64 e_blkno; /* Physical disk offset, in blocks */ /*10*/
};
struct ocfs2_chain_rec {
__le32 c_free; /* Number of free bits in this chain. */
__le32 c_total; /* Number of total bits in this chain */
__le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
};
struct ocfs2_truncate_rec {
__le32 t_start; /* 1st cluster in this log */
__le32 t_clusters; /* Number of total clusters covered */
};
/* * On disk extent list for OCFS2 (node in the tree). Note that this * is contained inside ocfs2_dinode or ocfs2_extent_block, so the * offsets are relative to ocfs2_dinode.id2.i_list or * ocfs2_extent_block.h_list, respectively.
*/ struct ocfs2_extent_list { /*00*/ __le16 l_tree_depth; /* Extent tree depth from this
point. 0 means data extents
hang directly off this
header (a leaf)
NOTE: The high 8 bits cannot be
used - tree_depth is never that big.
*/
__le16 l_count; /* Number of extent records */
__le16 l_next_free_rec; /* Next unused extent slot */
__le16 l_reserved1;
__le64 l_reserved2; /* Pad to
sizeof(ocfs2_extent_rec) */ /*10*/ struct ocfs2_extent_rec l_recs[]; /* Extent records */
};
/* * On disk allocation chain list for OCFS2. Note that this is * contained inside ocfs2_dinode, so the offsets are relative to * ocfs2_dinode.id2.i_chain.
*/ struct ocfs2_chain_list { /*00*/ __le16 cl_cpg; /* Clusters per Block Group */
__le16 cl_bpc; /* Bits per cluster */
__le16 cl_count; /* Total chains in this list */
__le16 cl_next_free_rec; /* Next unused chain slot */
__le64 cl_reserved1; /*10*/ struct ocfs2_chain_rec cl_recs[]; /* Chain records */
};
/* * On disk deallocation log for OCFS2. Note that this is * contained inside ocfs2_dinode, so the offsets are relative to * ocfs2_dinode.id2.i_dealloc.
*/ struct ocfs2_truncate_log { /*00*/ __le16 tl_count; /* Total records in this log */
__le16 tl_used; /* Number of records in use */
__le32 tl_reserved1; /*08*/ struct ocfs2_truncate_rec tl_recs[]; /* Truncate records */
};
/* * On disk extent block (indirect block) for OCFS2
*/ struct ocfs2_extent_block
{ /*00*/ __u8 h_signature[8]; /* Signature for verification */ struct ocfs2_block_check h_check; /* Error checking */ /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this
extent_header belongs to */
__le16 h_suballoc_bit; /* Bit offset in suballocator
block group */
__le32 h_fs_generation; /* Must match super block */
__le64 h_blkno; /* Offset on disk, in blocks */ /*20*/ __le64 h_suballoc_loc; /* Suballocator block group this
eb belongs to. Only valid if allocated from a
discontiguous block group */
__le64 h_next_leaf_blk; /* Offset on disk, in blocks, of next leaf header pointing
to data */ /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ /* Actual on-disk size is one block */
};
/* * On disk slot map for OCFS2. This defines the contents of the "slot_map" * system file. A slot is valid if it contains a node number >= 0. The * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty.
*/ struct ocfs2_slot_map { /*00*/ DECLARE_FLEX_ARRAY(__le16, sm_slots); /* * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255, * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
*/
};
/* * 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*/ DECLARE_FLEX_ARRAY(struct ocfs2_extended_slot, se_slots); /* * 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 forthis fs*/
__le16 s_reserved0;
__le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash.
* s_uuid_hash serves as seed[3]. */ /*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */ /*140*/
/* * NOTE: As stated above, all offsets are relative to * ocfs2_dinode.id2, which is at 0xC0 in the inode. * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within * our smallest blocksize, which is 512 bytes. To ensure this, * we reserve the space in s_reserved2. Anything past s_reserved2 * will not be available on the smallest blocksize.
*/
};
/* * Local allocation bitmap for OCFS2 slots * Note that it exists inside an ocfs2_dinode, so all offsets are * relative to the start of ocfs2_dinode.id2.
*/ struct ocfs2_local_alloc
{ /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */
__le16 la_size; /* Size of included bitmap, in bytes */
__le16 la_reserved1;
__le64 la_reserved2; /*10*/ __u8 la_bitmap[];
};
/* * Data-in-inode header. This is only used if i_dyn_features has * OCFS2_INLINE_DATA_FL set.
*/ struct ocfs2_inline_data
{ /*00*/ __le16 id_count; /* Number of bytes that can be used
* for data, starting at id_data */
__le16 id_reserved0;
__le32 id_reserved1;
__u8 id_data[]; /* Start of user data */
};
/* * On disk inode for OCFS2
*/ struct ocfs2_dinode { /*00*/ __u8 i_signature[8]; /* Signature for validation */
__le32 i_generation; /* Generation number */
__le16 i_suballoc_slot; /* Slot suballocator this inode
belongs to */
__le16 i_suballoc_bit; /* Bit offset in suballocator
block group */ /*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */
__le16 i_xattr_inline_size;
__le32 i_clusters; /* Cluster count */
__le32 i_uid; /* Owner UID */
__le32 i_gid; /* Owning GID */ /*20*/ __le64 i_size; /* Size in bytes */
__le16 i_mode; /* File mode */
__le16 i_links_count; /* Links count */
__le32 i_flags; /* File flags */ /*30*/ __le64 i_atime; /* Access time */
__le64 i_ctime; /* Creation time */ /*40*/ __le64 i_mtime; /* Modification time */
__le64 i_dtime; /* Deletion time */ /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */
__le64 i_last_eb_blk; /* Pointer to last extent
block */ /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */
__le32 i_atime_nsec;
__le32 i_ctime_nsec;
__le32 i_mtime_nsec; /*70*/ __le32 i_attr;
__le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL
was set in i_flags */
__le16 i_dyn_features;
__le64 i_xattr_loc; /*80*/ struct ocfs2_block_check i_check; /* Error checking */ /*88*/ __le64 i_dx_root; /* Pointer to dir index root block */ /*90*/ __le64 i_refcount_loc;
__le64 i_suballoc_loc; /* Suballocator block group this inode belongs to. Only valid if allocated from a
discontiguous block group */ /*A0*/ __le16 i_dio_orphaned_slot; /* only used for append dio write */
__le16 i_reserved1[3];
__le64 i_reserved2[2]; /*B8*/ union {
__le64 i_pad1; /* Generic way to refer to this
64bit union */ struct {
__le64 i_rdev; /* Device number */
} dev1; struct { /* Info for bitmap system
inodes */
__le32 i_used; /* Bits (ie, clusters) used */
__le32 i_total; /* Total bits (clusters)
available */
} bitmap1; struct { /* Info for journal system
inodes */
__le32 ij_flags; /* Mounted, version, etc. */
__le32 ij_recovery_generation; /* Incremented when the journal is recovered after an unclean
shutdown */
} journal1;
} id1; /* Inode type dependent 1 */ /*C0*/ union { struct ocfs2_super_block i_super; struct ocfs2_local_alloc i_lab; struct ocfs2_chain_list i_chain; struct ocfs2_extent_list i_list; struct ocfs2_truncate_log i_dealloc; struct ocfs2_inline_data i_data;
DECLARE_FLEX_ARRAY(__u8, i_symlink);
} id2; /* Actual on-disk size is one block */
};
/* * On-disk directory entry structure for OCFS2 * * Packed as this structure could be accessed unaligned on 64-bit platforms
*/ struct ocfs2_dir_entry { /*00*/ __le64 inode; /* Inode number */
__le16 rec_len; /* Directory entry length */
__u8 name_len; /* Name length */
__u8 file_type; /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ /* Actual on-disk length specified by rec_len */
} __attribute__ ((packed));
/* * Per-block record for the unindexed directory btree. This is carefully * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are * mirrored. That way, the directory manipulation code needs a minimal amount * of update. * * NOTE: Keep this structure aligned to a multiple of 4 bytes.
*/ struct ocfs2_dir_block_trailer { /*00*/ __le64 db_compat_inode; /* Always zero. Was inode */
__le16 db_compat_rec_len; /* Backwards compatible with
* ocfs2_dir_entry. */
__u8 db_compat_name_len; /* Always zero. Was name_len */
__u8 db_reserved0;
__le16 db_reserved1;
__le16 db_free_rec_len; /* Size of largest empty hole
* in this block. (unused) */ /*10*/ __u8 db_signature[8]; /* Signature for verification */
__le64 db_reserved2; /*20*/ __le64 db_free_next; /* Next block in list (unused) */
__le64 db_blkno; /* Offset on disk, in blocks */ /*30*/ __le64 db_parent_dinode; /* dinode which owns me, in
blocks */ struct ocfs2_block_check db_check; /* Error checking */ /*40*/
};
/* * A directory entry in the indexed tree. We don't store the full name here, * but instead provide a pointer to the full dirent in the unindexed tree. * * We also store name_len here so as to reduce the number of leaf blocks we * need to search in case of collisions.
*/ struct ocfs2_dx_entry {
__le32 dx_major_hash; /* Used to find logical
* cluster in index */
__le32 dx_minor_hash; /* Lower bits used to find
* block in cluster */
__le64 dx_dirent_blk; /* Physical block in unindexed
* tree holding this dirent. */
};
struct ocfs2_dx_entry_list {
__le32 de_reserved;
__le16 de_count; /* Maximum number of entries
* possible in de_entries */
__le16 de_num_used; /* Current number of
* de_entries entries */ struct ocfs2_dx_entry de_entries[]; /* Indexed dir entries * in a packed array of
* length de_num_used */
};
#define OCFS2_DX_FLAG_INLINE 0x01
/* * A directory indexing block. Each indexed directory has one of these, * pointed to by ocfs2_dinode. * * This block stores an indexed btree root, and a set of free space * start-of-list pointers.
*/ struct ocfs2_dx_root_block {
__u8 dr_signature[8]; /* Signature for verification */ struct ocfs2_block_check dr_check; /* Error checking */
__le16 dr_suballoc_slot; /* Slot suballocator this
* block belongs to. */
__le16 dr_suballoc_bit; /* Bit offset in suballocator
* block group */
__le32 dr_fs_generation; /* Must match super block */
__le64 dr_blkno; /* Offset on disk, in blocks */
__le64 dr_last_eb_blk; /* Pointer to last
* extent block */
__le32 dr_clusters; /* Clusters allocated
* to the indexed tree. */
__u8 dr_flags; /* OCFS2_DX_FLAG_* flags */
__u8 dr_reserved0;
__le16 dr_reserved1;
__le64 dr_dir_blkno; /* Pointer to parent inode */
__le32 dr_num_entries; /* Total number of * names stored in
* this directory.*/
__le32 dr_reserved2;
__le64 dr_free_blk; /* Pointer to head of free
* unindexed block list. */
__le64 dr_suballoc_loc; /* Suballocator block group this root belongs to. Only valid if allocated from a discontiguous
block group */
__le64 dr_reserved3[14]; union { struct ocfs2_extent_list dr_list; /* Keep this aligned to 128 * bits for maximum space
* efficiency. */ struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of * entries. We grow out * to extents if this
* gets too big. */
};
};
/* * The header of a leaf block in the indexed tree.
*/ struct ocfs2_dx_leaf {
__u8 dl_signature[8];/* Signature for verification */ struct ocfs2_block_check dl_check; /* Error checking */
__le64 dl_blkno; /* Offset on disk, in blocks */
__le32 dl_fs_generation;/* Must match super block */
__le32 dl_reserved0;
__le64 dl_reserved1; struct ocfs2_dx_entry_list dl_list;
};
/* * Largest bitmap for a block (suballocator) group in bytes. This limit * does not affect cluster groups (global allocator). Cluster group * bitmaps run to the end of the block.
*/ #define OCFS2_MAX_BG_BITMAP_SIZE 256
/* * On disk allocator group structure for OCFS2
*/ struct ocfs2_group_desc
{ /*00*/ __u8 bg_signature[8]; /* Signature for validation */
__le16 bg_size; /* Size of included bitmap in
bytes. */
__le16 bg_bits; /* Bits represented by this
group. */
__le16 bg_free_bits_count; /* Free bits count */
__le16 bg_chain; /* What chain I am in. */ /*10*/ __le32 bg_generation;
__le16 bg_contig_free_bits; /* max contig free bits length */
__le16 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 {
DECLARE_FLEX_ARRAY(__u8, bg_bitmap); 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)
struct ocfs2_refcount_list { /*00*/ __le16 rl_count; /* Maximum number of entries possible
in rl_records */
__le16 rl_used; /* Current number of used records */
__le32 rl_reserved2;
__le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */ /*10*/ struct ocfs2_refcount_rec rl_recs[]; /* Refcount records */
};
struct ocfs2_refcount_block { /*00*/ __u8 rf_signature[8]; /* Signature for verification */
__le16 rf_suballoc_slot; /* Slot suballocator this block
belongs to */
__le16 rf_suballoc_bit; /* Bit offset in suballocator
block group */
__le32 rf_fs_generation; /* Must match superblock */ /*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */
__le64 rf_parent; /* Parent block, only valid if OCFS2_REFCOUNT_LEAF_FL is set in
rf_flags */ /*20*/ struct ocfs2_block_check rf_check; /* Error checking */
__le64 rf_last_eb_blk; /* Pointer to last extent block */ /*30*/ __le32 rf_count; /* Number of inodes sharing this
refcount tree */
__le32 rf_flags; /* See the flags above */
__le32 rf_clusters; /* clusters covered by refcount tree. */
__le32 rf_cpos; /* cluster offset in refcount tree.*/ /*40*/ __le32 rf_generation; /* generation number. all be the same
* for the same refcount tree. */
__le32 rf_reserved0;
__le64 rf_suballoc_loc; /* Suballocator block group this refcount block belongs to. Only valid if allocated from a
discontiguous block group */ /*50*/ __le64 rf_reserved1[6]; /*80*/ union { struct ocfs2_refcount_list rf_records; /* List of refcount
records */ struct ocfs2_extent_list rf_list; /* Extent record list, only valid if OCFS2_REFCOUNT_TREE_FL
is set in rf_flags */
}; /* Actual on-disk size is one block */
};
/* * On disk extended attribute structure for OCFS2.
*/
/* * ocfs2_xattr_entry indicates one extend attribute. * * Note that it can be stored in inode, one block or one xattr bucket.
*/ struct ocfs2_xattr_entry {
__le32 xe_name_hash; /* hash value of xattr prefix+suffix. */
__le16 xe_name_offset; /* byte offset from the 1st entry in the local xattr storage(inode, xattr block or
xattr bucket). */
__u8 xe_name_len; /* xattr name len, doesn't include prefix. */
__u8 xe_type; /* the low 7 bits indicate the name prefix * type and the highest bit indicates whether
* the EA is stored in the local storage. */
__le64 xe_value_size; /* real xattr value length. */
};
/* * On disk structure for xattr header. * * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in * the local xattr storage.
*/ struct ocfs2_xattr_header {
__le16 xh_count; /* contains the count of how many records are in the
local xattr storage. */
__le16 xh_free_start; /* current offset for storing
xattr. */
__le16 xh_name_value_len; /* total length of name/value
length in this bucket. */
__le16 xh_num_buckets; /* Number of xattr buckets in this extent record, only valid in the first
bucket. */ struct ocfs2_block_check xh_check; /* Error checking (Note, this is only used for xattr buckets. A block uses xb_check and sets
this field to zero.) */ struct ocfs2_xattr_entry xh_entries[]; /* xattr entry list. */
};
/* * On disk structure for xattr value root. * * When an xattr's value is large enough, it is stored in an external * b-tree like file data. The xattr value root points to this structure.
*/ struct ocfs2_xattr_value_root { /*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */
__le32 xr_reserved0;
__le64 xr_last_eb_blk; /* Pointer to last extent block */ /*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */
};
/* * On disk structure for xattr tree root. * * It is used when there are too many extended attributes for one file. These * attributes will be organized and stored in an indexed-btree.
*/ struct ocfs2_xattr_tree_root { /*00*/ __le32 xt_clusters; /* clusters covered by xattr. */
__le32 xt_reserved0;
__le64 xt_last_eb_blk; /* Pointer to last extent block */ /*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */
};
/* * 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 contains xattr
tree. */
} xb_attrs;
};
/* 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 */
};
/* 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) */
/* Information header of local quota file (immediately follows the generic
* header) */ struct ocfs2_local_disk_dqinfo {
__le32 dqi_flags; /* Flags for quota file */
__le32 dqi_chunks; /* Number of chunks of quota structures
* with a bitmap */
__le32 dqi_blocks; /* Number of blocks allocated for quota file */
};
/* Header of one chunk of a quota file */ struct ocfs2_local_disk_chunk {
__le32 dqc_free; /* Number of free entries in the bitmap */
__u8 dqc_bitmap[]; /* Bitmap of entries in the corresponding
* chunk of quota file */
};
/* One entry in local quota file */ struct ocfs2_local_disk_dqblk { /*00*/ __le64 dqb_id; /* id this quota applies to */
__le64 dqb_spacemod; /* Change in the amount of used space */ /*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */
};
/* * The quota trailer lives at the end of each quota block.
*/
struct ocfs2_disk_dqtrailer { /*00*/ struct ocfs2_block_check dq_check; /* Error checking */ /*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
};
staticinlineint 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;
}
staticinlineint ocfs2_truncate_recs_per_inode(struct super_block *sb)
{ int size;
staticinlineint 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;
}
staticinlineint ocfs2_truncate_recs_per_inode(int blocksize)
{ int size;
staticinlineint 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);
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