int ntfs_statfs (struct super_block * sb, struct kstatfs * sfs);
Return information about the mounted NTFS volume sb in the statfs structure pointed to by sfs (this is initialized with zeros before ntfs_statfs is called). We interpret the values to be correct of the moment in time at which we are called. Most values are variable otherwise and this isn't just the free values but the totals as well. For example we can increase the total number of file nodes if we run out and we can keep doing this until there is no more space on the volume left at all.
Called from vfs_statfs which is used to handle the statfs, fstatfs, and ustat system calls.
Return 0 on success or -errno on error.