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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 <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3596
25 lines
741 B
Plaintext
25 lines
741 B
Plaintext
dnl #
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dnl # 4.2 API change
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dnl # This kernel retired the nameidata structure which forced the
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dnl # restructuring of the follow_link() prototype and how it is called.
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dnl # We check for the new interface rather than detecting the old one.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_FOLLOW_LINK], [
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AC_MSG_CHECKING([whether iops->follow_link() passes nameidata])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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const char *follow_link(struct dentry *de, void **cookie)
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{ return "symlink"; }
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static struct inode_operations iops __attribute__ ((unused)) = {
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.follow_link = follow_link,
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};
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],[
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],[
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AC_MSG_RESULT(no)
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_FOLLOW_LINK_NAMEIDATA, 1,
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[iops->follow_link() nameidata])
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])
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])
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