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    SubjectRe: [patch 00/13] vfs: add helpers to check r/o bind mounts
    On Thu, Apr 24, 2008 at 01:25:58PM -0400, Erez Zadok wrote:
    > Al, any near-term plans for sb-level "want write" locking as we discussed
    > briefly at LSF? Being able to do so for copyup in unionfs will hopefully
    > allow me to prevent concurrent topology changes.

    That's pretty close to the top.

    > the two directories that need locking. This rename-locking protocol appears
    > to be a special case of the sb-level "want write" idea, right?

    Not really - that one doesn't provide any exclusion between writers and
    that's what we want from rename/rename.

    Take a look at Documentation/filesystems/directory-locking for details
    of locking scheme...


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