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LOCK_MAY_READ(9) The Linux VFS 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.

COPYRIGHT

March 2016 Kernel Hackers Manual 3.2.