vfs: add d_is_dir()
Add d_is_dir(dentry) helper which is analogous to S_ISDIR(). To avoid confusion, rename d_is_directory() to d_can_lookup(). Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz> Reviewed-by: NJ. Bruce Fields <bfields@redhat.com>
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