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83 lines
2.5 KiB
83 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _OMFS_FS_H |
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#define _OMFS_FS_H |
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/* OMFS On-disk structures */ |
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#define OMFS_MAGIC 0xC2993D87 |
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#define OMFS_IMAGIC 0xD2 |
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#define OMFS_DIR 'D' |
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#define OMFS_FILE 'F' |
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#define OMFS_INODE_NORMAL 'e' |
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#define OMFS_INODE_CONTINUATION 'c' |
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#define OMFS_INODE_SYSTEM 's' |
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#define OMFS_NAMELEN 256 |
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#define OMFS_DIR_START 0x1b8 |
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#define OMFS_EXTENT_START 0x1d0 |
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#define OMFS_EXTENT_CONT 0x40 |
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#define OMFS_XOR_COUNT 19 |
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#define OMFS_MAX_BLOCK_SIZE 8192 |
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#define OMFS_MAX_CLUSTER_SIZE 8 |
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#define OMFS_MAX_BLOCKS (1ul << 31) |
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struct omfs_super_block { |
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char s_fill1[256]; |
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__be64 s_root_block; /* block number of omfs_root_block */ |
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__be64 s_num_blocks; /* total number of FS blocks */ |
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__be32 s_magic; /* OMFS_MAGIC */ |
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__be32 s_blocksize; /* size of a block */ |
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__be32 s_mirrors; /* # of mirrors of system blocks */ |
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__be32 s_sys_blocksize; /* size of non-data blocks */ |
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}; |
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struct omfs_header { |
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__be64 h_self; /* FS block where this is located */ |
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__be32 h_body_size; /* size of useful data after header */ |
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__be16 h_crc; /* crc-ccitt of body_size bytes */ |
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char h_fill1[2]; |
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u8 h_version; /* version, always 1 */ |
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char h_type; /* OMFS_INODE_X */ |
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u8 h_magic; /* OMFS_IMAGIC */ |
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u8 h_check_xor; /* XOR of header bytes before this */ |
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__be32 h_fill2; |
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}; |
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struct omfs_root_block { |
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struct omfs_header r_head; /* header */ |
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__be64 r_fill1; |
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__be64 r_num_blocks; /* total number of FS blocks */ |
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__be64 r_root_dir; /* block # of root directory */ |
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__be64 r_bitmap; /* block # of free space bitmap */ |
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__be32 r_blocksize; /* size of a block */ |
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__be32 r_clustersize; /* size allocated for data blocks */ |
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__be64 r_mirrors; /* # of mirrors of system blocks */ |
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char r_name[OMFS_NAMELEN]; /* partition label */ |
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}; |
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struct omfs_inode { |
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struct omfs_header i_head; /* header */ |
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__be64 i_parent; /* parent containing this inode */ |
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__be64 i_sibling; /* next inode in hash bucket */ |
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__be64 i_ctime; /* ctime, in milliseconds */ |
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char i_fill1[35]; |
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char i_type; /* OMFS_[DIR,FILE] */ |
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__be32 i_fill2; |
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char i_fill3[64]; |
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char i_name[OMFS_NAMELEN]; /* filename */ |
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__be64 i_size; /* size of file, in bytes */ |
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}; |
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struct omfs_extent_entry { |
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__be64 e_cluster; /* start location of a set of blocks */ |
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__be64 e_blocks; /* number of blocks after e_cluster */ |
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}; |
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struct omfs_extent { |
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__be64 e_next; /* next extent table location */ |
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__be32 e_extent_count; /* total # extents in this table */ |
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__be32 e_fill; |
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struct omfs_extent_entry e_entry; /* start of extent entries */ |
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}; |
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#endif
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