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Minix2.0/src/fs/lock.h

/* This is the file locking table.  Like the filp table, it points to the
 * inode table, however, in this case to achieve advisory locking.
 */
EXTERN struct file_lock {
  short lock_type;		/* F_RDLOCK or F_WRLOCK; 0 means unused slot */
  pid_t lock_pid;		/* pid of the process holding the lock */
  struct inode *lock_inode;	/* pointer to the inode locked */
  off_t lock_first;		/* offset of first byte locked */
  off_t lock_last;		/* offset of last byte locked */
} file_lock[NR_LOCKS];