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    SubjectRe: udev and devfs - The final word
    On Sun, Jan 04, 2004 at 08:43:27PM -0500, Jeremy Maitin-Shepard wrote:

    > Unfortunately, programs such as tar depend on inode numbers of distinct
    > files being distinct even when the file is not open over a period of
    > several minutes/seconds. This is needed to avoid dumping hard links
    > more than once. Furthermore, there is no efficient way to write
    > programs such as tar without depending on this capability. Thus, if
    > st_ino cannot be used reliably for this purpose, it would be useful for
    > there to be a system call for retrieving a true
    > unique-within-the-filesystem identifier for the file.

    No such thing. It's not the matter of having a syscall to extract such
    identifier - it's that on a lot of filesystems (including many common Unix
    ones) there's nothing that would qualify.

    Note that tar et.al. do not behave well if used on actively modified directory
    tree and ->st_ino reuse is the least of the problems in that area.
    -
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