lock_may_read
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## 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.

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