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* Linux 4.2 compat: follow_link() / put_link()Brian Behlendorf2015-07-171-0/+24
As of Linux 4.2 the kernel has completely retired the nameidata structure. One of the few remaining consumers of this interface were the follow_link() and put_link() callbacks. This patch adds the required checks to configure to detect the interface change and updates the functions accordingly. Migrating to the simple_follow_link() interface was considered but was decided against ironically due to the increased complexity. It also should be noted that the kernel follow_link() and put_link() interfaces changes several times after 4.1 and but before 4.2. This means there is a narrow range of kernel commits which never appear in an official tag of the Linux kernel which ZoL will not build. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Richard Yao <[email protected]> Issue #3596