Name

lock_may_read — checks that the region is free of locks

Synopsis

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

Arguments

inode

the inode that is being read

start

the first byte to read

len

the number of bytes to read

Description

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.