On Thursday 03 of March 2011 18:16:03 you wrote: > By the way, can you enhance the series so that the directory argument > works for any directories in the filesystem rather than just a mount > point? That actually was aim at some point -- to let indicate filesystem by any object on it. However, I can't find a reliable way. If you can hint one, I'll gladly implement. First idea was to use stat's (struct stat).st_dev, but it seems there is no standard way of translating (minor, major) into filesystem from userspace. There's a kernel function for that, but not exposed through syscall. There is a custom library function by HP, but it doesn't feel very reasonable to rely on it. Second idea was to process pathname by combination of realpath() and stripping segments -- but it turns out dot-dot semantics are broken in POSIX OSes [1] making that way unreliable. One caveat is that a device would not indicate the filesystem it belongs to, but a filesystem on a partition/device it addresses. Another caveat is that processing a NILFS2 stored in a file (say, a HDD image) would require some specialized syntax. While those may not sound very serious for interactive use, I believe that our tools would become too unreliable for scripts in some edge cases. Thus I gave up ;-) A minimalistic version -- only lstat() [sic] with S_ISDIR() -- would work, but that's not very much of a progress to me. [1] http://doc.cat-v.org/plan_9/4th_edition/papers/lexnames -- dexen deVries ``One can't proceed from the informal to the formal by formal means.'' -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
