Ceph » rbd

I've implemented these fixes and will post them for
review after I've done some better testing.

I also made a few more miscellaneous changes, which I'll
just add to this bug.

First two patches that flesh out some code. I've been
carrying these around but there's no reason not to just
check them in.

    libceph: validate timespec conversions

    A ceph timespec contains 32-bit unsigned values for its seconds and
    nanoseconds components.  For a standard timespec, both fields are
    signed, and the seconds field is almost surely 64 bits.

    Add some explicit casts so the fact that this conversion is taking
    place is obvious.  Also trip a bug if we ever try to put out of
    range (negative or too big) values into a ceph timespec.

    Signed-off-by: Alex Elder <elder@inktank.com>

    libceph: add signed type limits

    Flesh out the limits defined in <linux/ceph/decode.h> to include the
    maximum and minimum values for signed type S8, S16, S32, and S64.

    Signed-off-by: Alex Elder <elder@inktank.com>

    rbd: void data pointers for rbd_obj_method_sync()

    Make the inbound and outbound data parameters have void rather than
    character type for rbd_obj_method_sync().  This makes it more clear
    they don't expect typed data, and eliminates the need for some silly
    type casts.

    One more unrelated change: define the features buffer used in
    _rbd_dev_v2_snap_features() to be a packed data structure.

    Signed-off-by: Alex Elder <elder@inktank.com>

    rbd: give rbd_obj_read_sync() buffer void type

    Make the buf parameter into which the data is to be read have type
    void pointer.

    Signed-off-by: Alex Elder <elder@inktank.com>

The following have been posted for review, and are
available in the "review/wip-stripe-v2" branch of
the ceph-client git repository.

[PATCH 1/2] libceph: add signed type limits
[PATCH 2/2] libceph: validate timespec conversions

[PATCH 1/2] rbd: give rbd_obj_read_sync() buffer void type
[PATCH 2/2] rbd: void data pointers for rbd_obj_method_sync()

[PATCH] rbd: have rbd_obj_method_sync() return transfer count

The following have been committed to the "testing" branch of
the ceph-client git repository.

3ad6cbd9 libceph: add signed type limits
7de8ad4 libceph: validate timespec conversions
48cd1f3 rbd: give rbd_obj_read_sync() buffer void type
d77e581 rbd: void data pointers for rbd_obj_method_sync()
9f203f3 rbd: have rbd_obj_method_sync() return transfer count