Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug


       lock_may_read - checks that the region is free of locks


       int lock_may_read  (struct inode * inode, loff_t start,
                            unsigned long len);


       inode  the inode that is being read

       start  the first byte to read

       len    the number of bytes to read


       Emulates  Windows  locking  requirements.  Whole-file  mandatory  locks
       (share  modes)  can  prohibit  a  read  and  byte-range POSIX locks can
       prohibit a read if they overlap.

       N.B. this function is only ever called  from  knfsd  and  ownership  of
       locks is never checked.