servers/vfs/lock.h

   1 /* This is the file locking table.  Like the filp table, it points to the
   2  * inode table, however, in this case to achieve advisory locking.
   3  */
   4 EXTERN struct file_lock {
   5   short lock_type;              /* F_RDLOCK or F_WRLOCK; 0 means unused slot */
   6   pid_t lock_pid;               /* pid of the process holding the lock */
   7   struct vnode *lock_vnode;
   8   off_t lock_first;             /* offset of first byte locked */
   9   off_t lock_last;              /* offset of last byte locked */
  10 } file_lock[NR_LOCKS];
  11
  12 #define NIL_LOCK (struct file_lock *) 0
  13