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    SubjectRe: Linux/Pro -- clusters

    [apologies for over-the-head reply]

    > On Mon, 3 Dec 2001, Donald Becker wrote:

    > > a SCSI device layer that isn't three half-finished clean-ups

    > > a VFS layer that doesn't require the kernel to know a priori all of
    > > the filesystem types that might be loaded

    WTF? The only interpretation I can think of is about unions in struct
    inode and struct superblock. _If_ you add a filesystem that
    a) doesn't do separate allocation of fs-private parts of
    inode/superblock (i.e. doesn't use ->u.gerneric_ip and ->u.generic_sbp) and
    b) hadn't been known at kernel compile time and
    c) has one of these fields (member in inode->u or sb->u) bigger than
    all filesystems known at compile time

    - yes, you've got a problem.

    Solution: use ->u.generic_<...>. Works fine.

    Not to mention the fact that VFS per se doesn't give a damn for fs types.
    All it needs is sizeof(struct inode) and sizeof(struct superblock). And
    any fs using ->generic_<...> (i.e. pointer to separately allocated private
    objects) is OK, whether it was known at build time or not.

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