lock_may_read(9)
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.