.TH "lock_may_read" 9 "lock_may_read" "25 May 1998" "Kernel Hacker's Manual" LINUX
.SH NAME
lock_may_read \-  checks that the region is free of locks
.SH SYNOPSIS
.B "int" lock_may_read
.BI "(struct inode *" inode ","
.BI "loff_t " start ","
.BI "unsigned long " len ");"
.SH ARGUMENTS
.IP "inode" 12
 the inode that is being read
.IP "start" 12
 the first byte to read
.IP "len" 12
 the number of bytes to read
.SH "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.