# define NLOCK 10

/*
 * Structure of lock table entry for system level file region locking.
 * We only implement lock against lock and only immediate return
 * on failure (no queueing yet).
 * The file member is NULL if the lock table entry is unallocated.
 * offset is the byte number of the first locked byte of the file.
 * size is the number of bytes in this locked regions.
 * Regions may not overlap.
 * A region may not be multiply locked.
 * Locks are inherited on fork.
 * Ex. child may clear parent's locks.
 */

struct lock
	{
	struct file *file;		/* file/user identity */
	unsigned long offset;		/* location of region */
	unsigned int size;		/* size of region */
	}
	llist [];