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    SubjectRe: [RFC PATCH 6/10] vfs: shared subtree aware move mounts
    On Fri, Sep 16, 2005 at 11:26:20AM -0700, Ram wrote:
    > Patch that help move a mount tree to a different mountpoint. The tree can
    > contain any combination of shared/slave/private/unclonable mounts.

    OK, that answers the question about MS_MOVE... Please, add brute-force
    "we don't allow it other than in trivial case" *before* the previous
    patch, replacing it with the right thing here.

    BTW, I suspect that a look at operations on ->mnt_list and friends you
    have in the entire thing would bring several inlined helpers covering
    most of the instances; there's definitely too much raw list_add(), etc.
    instances in the current code.

    > +/*
    > + * return 1 if the mount tree contains a unclonable mount
    > + */
    > +static inline int tree_contains_unclone(struct vfsmount *mnt)
    > +{
    > + struct vfsmount *p;
    > + for (p = mnt; p; p = next_mnt(p, mnt)) {
    > + if (IS_MNT_UNCLONABLE(p))
    > + return 1;
    > + }
    > + return 0;
    > +}

    FWIW, such helpers should probably go in the same place where you
    introduce unclonable - they won't complicate earlier patch and will
    be in place there and they won't clutter this one anymore.
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      Last update: 2005-09-20 12:04    [W:0.038 / U:7.408 seconds]
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