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WSL2-Linux-Kernel/fs/ocfs2/ocfs2_fs.h

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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* ocfs2_fs.h
*
* On-disk structures for OCFS2.
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License, version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef _OCFS2_FS_H
#define _OCFS2_FS_H
/* Version */
#define OCFS2_MAJOR_REV_LEVEL 0
#define OCFS2_MINOR_REV_LEVEL 90
/*
* An OCFS2 volume starts this way:
* Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
* Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
* Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
*
* All other structures are found from the superblock information.
*
* OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a
* blocksize of 2K, it is 4096 bytes into disk.
*/
#define OCFS2_SUPER_BLOCK_BLKNO 2
/*
* Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
* grow if needed.
*/
#define OCFS2_MIN_CLUSTERSIZE 4096
#define OCFS2_MAX_CLUSTERSIZE 1048576
/*
* Blocks cannot be bigger than clusters, so the maximum blocksize is the
* minimum cluster size.
*/
#define OCFS2_MIN_BLOCKSIZE 512
#define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE
/* Filesystem magic number */
#define OCFS2_SUPER_MAGIC 0x7461636f
/* Object signatures */
#define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2"
#define OCFS2_INODE_SIGNATURE "INODE01"
#define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01"
#define OCFS2_GROUP_DESC_SIGNATURE "GROUP01"
/* 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 0
#define OCFS2_FEATURE_INCOMPAT_SUPP 0
#define OCFS2_FEATURE_RO_COMPAT_SUPP 0
/*
* 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
/*
* 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 */
/*
* 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
/* Journal limits (in bytes) */
#define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
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,
#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_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,
NUM_SYSTEM_INODES
};
static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
/* Global system inodes (single copy) */
/* The first two are only used from userspace mfks/tunefs */
[BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 },
[GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
/* These are used by the running filesystem */
[SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 },
[HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
[GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 },
/* 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 }
};
/* Parameter passed from mount.ocfs2 to module */
#define OCFS2_HB_NONE "heartbeat=none"
#define OCFS2_HB_LOCAL "heartbeat=local"
/*
* OCFS2 directory file types. Only the low 3 bits are used. The
* other bits are reserved for now.
*/
#define OCFS2_FT_UNKNOWN 0
#define OCFS2_FT_REG_FILE 1
#define OCFS2_FT_DIR 2
#define OCFS2_FT_CHRDEV 3
#define OCFS2_FT_BLKDEV 4
#define OCFS2_FT_FIFO 5
#define OCFS2_FT_SOCK 6
#define OCFS2_FT_SYMLINK 7
#define OCFS2_FT_MAX 8
/*
* OCFS2_DIR_PAD defines the directory entries boundaries
*
* NOTE: It must be a multiple of 4
*/
#define OCFS2_DIR_PAD 4
#define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
#define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
#define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
OCFS2_DIR_ROUND) & \
~OCFS2_DIR_ROUND)
#define OCFS2_LINK_MAX 32000
#define S_SHIFT 12
static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
[S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
[S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
[S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
[S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
[S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
[S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
[S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
};
/*
* Convenience casts
*/
#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
/*
* On disk extent record for OCFS2
* It describes a range of clusters on disk.
*/
struct ocfs2_extent_rec {
/*00*/ __le32 e_cpos; /* Offset into the file, in clusters */
__le32 e_clusters; /* Clusters covered by this extent */
__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) */
__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 */
__le64 h_reserved1;
/*10*/ __le16 h_suballoc_slot; /* Slot suballocator this
extent_header belongs to */
__le16 h_suballoc_bit; /* Bit offset in suballocator
block group */
__le32 h_fs_generation; /* Must match super block */
__le64 h_blkno; /* Offset on disk, in blocks */
/*20*/ __le64 h_reserved3;
__le64 h_next_leaf_blk; /* Offset on disk, in blocks,
of next leaf header pointing
to data */
/*30*/ struct ocfs2_extent_list h_list; /* Extent record list */
/* Actual on-disk size is one block */
};
/*
* On disk 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_reserved1;
__le32 s_reserved2;
__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*/
};
/*
* 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];
};
/*
* 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*/ __le32 i_reserved0;
__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*/ __le64 i_reserved1[9];
/*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_pad;
} 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;
__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));
/*
* 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*/ __le64 bg_reserved2[2];
/*40*/ __u8 bg_bitmap[0];
};
#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_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_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_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 size;
size = sb->s_blocksize -
offsetof(struct ocfs2_group_desc, bg_bitmap);
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);
}
#else
static inline int ocfs2_fast_symlink_chars(int blocksize)
{
return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
}
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_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 size;
size = blocksize -
offsetof(struct ocfs2_group_desc, bg_bitmap);
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);
}
#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,
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];
}
#endif /* _OCFS2_FS_H */
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