Caleb Gardner
55 lines
1.3 KiB
Zig
55 lines
1.3 KiB
Zig
const math = @import("std").math;
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const InodeRef = @import("inode.zig").InodeRef;
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const CompressionType = @import("decompress.zig").CompressionType;
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pub const SuperblockError = error{
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InvalidMagic,
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InvalidLog,
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InvalidVersion,
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};
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pub const Superblock = packed struct {
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magic: u32,
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count: u32,
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mod_time: u32,
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block_size: u32,
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frags: u32,
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comp: CompressionType,
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block_log: u16,
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flags: packed struct {
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inode_uncomp: bool,
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data_uncomp: bool,
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_unused: bool,
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frag_uncomp: bool,
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frag_always: bool,
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data_dedupe: bool,
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export_table: bool,
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xattr_uncomp: bool,
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no_xattr: bool,
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comp_options: bool,
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id_uncomp: bool,
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_padding: u5,
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},
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id_count: u16,
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ver_maj: u16,
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ver_min: u16,
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root_inode: InodeRef,
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size: u64,
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id_table: u64,
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xattr_table: u64,
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inode_table: u64,
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dir_table: u64,
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frag_table: u64,
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export_table: u64,
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pub fn valid(self: Superblock) SuperblockError!void {
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if (self.magic != 0x73717368) {
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return SuperblockError.InvalidMagic;
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} else if (self.block_log != math.log2(self.block_size)) {
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return SuperblockError.InvalidLog;
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} else if (self.ver_maj != 4 or self.ver_min != 0) {
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return SuperblockError.InvalidVersion;
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}
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}
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};
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