xv6-cs450/fsvar.h

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// in-core file system types
struct inode {
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uint dev; // Device number
uint inum; // Inode number
int ref; // Reference count
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int flags; // I_BUSY, I_VALID
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short type; // copy of disk inode
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short major;
short minor;
short nlink;
uint size;
uint addrs[NADDRS];
};
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// unlocked inode - only dev and inum are available
struct uinode {
uint dev;
uint inum;
};
#define I_BUSY 0x1
#define I_VALID 0x2