initial code repo

This patch creates initial code repo.

For ceph, luminous stable release will be used for base code,
and next changes and optimization for ceph will be added to it.

For opensds, currently any changes can be upstreamed into original
opensds repo (https://github.com/opensds/opensds), and so stor4nfv
will directly clone opensds code to deploy stor4nfv environment.
And the scripts for deployment based on ceph and opensds will be
put into 'ci' directory.

Change-Id: I46a32218884c75dda2936337604ff03c554648e4
Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/src/ceph/doc/rbd/api/librbdpy.rst b/src/ceph/doc/rbd/api/librbdpy.rst
new file mode 100644
index 0000000..fa90331
--- /dev/null
+++ b/src/ceph/doc/rbd/api/librbdpy.rst
@@ -0,0 +1,82 @@
+================
+ Librbd (Python)
+================
+
+.. highlight:: python
+
+The `rbd` python module provides file-like access to RBD images.
+
+
+Example: Creating and writing to an image
+=========================================
+
+To use `rbd`, you must first connect to RADOS and open an IO
+context::
+
+    cluster = rados.Rados(conffile='my_ceph.conf')
+    cluster.connect()
+    ioctx = cluster.open_ioctx('mypool')
+
+Then you instantiate an :class:rbd.RBD object, which you use to create the
+image::
+
+    rbd_inst = rbd.RBD()
+    size = 4 * 1024**3  # 4 GiB
+    rbd_inst.create(ioctx, 'myimage', size)
+
+To perform I/O on the image, you instantiate an :class:rbd.Image object::
+
+    image = rbd.Image(ioctx, 'myimage')
+    data = 'foo' * 200
+    image.write(data, 0)
+
+This writes 'foo' to the first 600 bytes of the image. Note that data
+cannot be :type:unicode - `Librbd` does not know how to deal with
+characters wider than a :c:type:char.
+
+In the end, you will want to close the image, the IO context and the connection to RADOS::
+
+    image.close()
+    ioctx.close()
+    cluster.shutdown()
+
+To be safe, each of these calls would need to be in a separate :finally
+block::
+
+    cluster = rados.Rados(conffile='my_ceph_conf')
+    try:
+        ioctx = cluster.open_ioctx('my_pool')
+        try:
+            rbd_inst = rbd.RBD()
+            size = 4 * 1024**3  # 4 GiB
+            rbd_inst.create(ioctx, 'myimage', size)
+            image = rbd.Image(ioctx, 'myimage')
+            try:
+                data = 'foo' * 200
+                image.write(data, 0)
+            finally:
+                image.close()
+        finally:
+            ioctx.close()
+    finally:
+        cluster.shutdown()
+
+This can be cumbersome, so the :class:`Rados`, :class:`Ioctx`, and
+:class:`Image` classes can be used as context managers that close/shutdown
+automatically (see :pep:`343`). Using them as context managers, the
+above example becomes::
+
+    with rados.Rados(conffile='my_ceph.conf') as cluster:
+        with cluster.open_ioctx('mypool') as ioctx:
+            rbd_inst = rbd.RBD()
+            size = 4 * 1024**3  # 4 GiB
+            rbd_inst.create(ioctx, 'myimage', size)
+            with rbd.Image(ioctx, 'myimage') as image:
+                data = 'foo' * 200
+                image.write(data, 0)
+
+API Reference
+=============
+
+.. automodule:: rbd
+    :members: RBD, Image, SnapIterator