fs_context_for_submount
fc = fs_context_for_submount(&afs_fs_type, mntpt);
EXPORT_SYMBOL(fs_context_for_submount);
fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry);
fc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry);
fc = fs_context_for_submount(path->mnt->mnt_sb->s_type, mntpt);
extern struct fs_context *fs_context_for_submount(struct file_system_type *fs_type,
fc = fs_context_for_submount(type, mntpt);