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    SubjectRe: [PATCH] namespace.c: cleanup in mark_mounts_for_expiry()
    On Fri, May 20, 2005 at 03:54:51PM +0200, Miklos Szeredi wrote:
    > [ fell in love with that function, now can't let go... ]
    > This patch simplifies mark_mounts_for_expiry() by using detach_mnt()
    > instead of duplicating everything it does.
    > It should be an equivalent transformation except for righting the
    > dput/mntput order.

    Looks sane. However, we still have a problem here - just what would
    happen if vfsmount is detached while we were grabbing namespace
    semaphore? Refcount alone is not useful here - we might be held by
    whoever had detached the vfsmount. IOW, we should check that it's
    still attached (i.e. that mnt->mnt_parent != mnt). If it's not -
    just leave it alone, do mntput() and let whoever holds it deal with
    the sucker. No need to put it back on lists.
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      Last update: 2005-05-20 16:50    [W:0.020 / U:0.788 seconds]
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