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    SubjectRe: [PATCH 25/28] VFS: statfs(64) shouldn't follow last component symlink
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    Christoph Hellwig wrote:
    > On Mon, Oct 25, 2004 at 10:51:11AM -0400, Mike Waychison wrote:
    >
    >>Mount-related userspace tools will require the ability to detect whether what
    >>looks like a regular directory is actually a autofs trigger. To handle this,
    >>tools can statfs a given directory and check to see if statfs->f_type ==
    >>AUTOFSNG_SUPER_MAGIC before walking into the directory (and causing the a
    >>filesystem to automount).
    >>
    >>To make this happen, we cannot allow statfs to follow_link.
    >>
    >>NOTE: This may break any userspace that assumes it can statfs across a
    >>last-component symlink. I can't think of any real world breakage however, as
    >>mount(8) will drop the real path in /etc/mtab and /proc/mounts will always
    >>show the true path.
    >
    >
    > Which means it's vetoed. It's a big change in syscall semantics. And
    > propabably breaks SuS (for statvfs(3) which requires full symlink
    > resolution when it just refers to a path on the filesystem.
    >

    Ya, I figured that would be the case. What do folks think about a
    lstatfs(64)?

    - --
    Mike Waychison
    Sun Microsystems, Inc.
    1 (650) 352-5299 voice
    1 (416) 202-8336 voice

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