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    SubjectRe: Local loopback mounts (RFD)
    Alexander Viro wrote:
    :
    : > I think the Linux dentry mechanism can allow us to have
    : > loopback mounts faster and more effective than NFS mount from 127.0.0.1. Note
    :
    : Yes, but the way you have proposed is broken.
    :
    : > The loopfs_read_super() just creates the root dentry and points
    : > its dentry->d_inode to the inode of the target directory. This has the
    : > advantage that both /some/directory and /another/directory works with
    : > same inodes, so file locks works properly, open(O_EXCL) works properly, etc.
    :
    : ... and one can trivially create loops in on-disk structure that way
    : (think of nasty games with rename()). We do need a way to compute the
    : foo-is-ancestor-of-bar relation.
    :
    Well, if I do it using mount(2) and a new FS type, only root can do
    it. And root is able to break the system anyway.

    -Yenya

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    \ Jan "Yenya" Kasprzak <kas at fi.muni.cz> http://www.fi.muni.cz/~kas/
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    |||| It is the sound of Tux the penguin chewing on your system logs. ||||

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