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    SubjectRe: [PATCH -V18 04/13] vfs: Allow handle based open on symlinks
    On Sat, 21 Aug 2010 15:12:15 +0530, "Aneesh Kumar K. V" <> wrote:
    > On Sat, 21 Aug 2010 18:30:24 +1000, Nick Piggin <> wrote:
    > > Thanks, I had both of the same concerns as Christoph with API
    > > change and exposing symlink fds last time I looked at the patces,
    > > actually.
    > >
    > > But they can probably be worked around or avoided. I think the more
    > > important thing is whether it is worth supporting. This is
    > > all restricted to root (or CAP_DAC_READ_SEARCH) only, right, and
    > > what exact semantics they want. I would like to see more discussion
    > > of what this enables and some results.
    > >
    > > For the case of avoiding expensive network revalidations in path name
    > > lookup, do we even need to open symlinks? Could the security issues be
    > > avoided by always having handle attached to an open fd?
    > >
    > For implementing a userspace file server that use handle for
    > representing files (like NFS) we would require to have the ability to do
    > different file system operations that can operate on symlink to work on
    > handle too.

    linkat change to take NULL path name is needed for regular files
    also. The file server will get a request to create a link with handle
    of oldpath and directory handle of new path and new name.

    The changes would also help in the implementation of 9P server in Qemu
    for implementing a fast virtualization passthrough file system (aka


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