initial code repo

[stor4nfv.git] / src / ceph / src / librbd / api / Image.cc

diff --git a/src/ceph/src/librbd/api/Image.cc b/src/ceph/src/librbd/api/Image.cc
new file mode 100644 (file)
index 0000000..2704918
--- /dev/null
+++ b/src/ceph/src/librbd/api/Image.cc
@@ -0,0 +1,121 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/api/Image.h"
+#include "include/rados/librados.hpp"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "cls/rbd/cls_rbd_client.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::api::Image: " << __func__ << ": "
+
+namespace librbd {
+namespace api {
+
+template <typename I>
+int Image<I>::list_images(librados::IoCtx& io_ctx, ImageNameToIds *images) {
+  CephContext *cct = (CephContext *)io_ctx.cct();
+  ldout(cct, 20) << "io_ctx=" << &io_ctx << dendl;
+
+  // new format images are accessed by class methods
+  int r;
+  int max_read = 1024;
+  string last_read = "";
+  do {
+    map<string, string> images_page;
+    r = cls_client::dir_list(&io_ctx, RBD_DIRECTORY,
+                  last_read, max_read, &images_page);
+    if (r < 0 && r != -ENOENT) {
+      lderr(cct) << "error listing image in directory: "
+                 << cpp_strerror(r) << dendl;
+      return r;
+    } else if (r == -ENOENT) {
+      break;
+    }
+    for (map<string, string>::const_iterator it = images_page.begin();
+         it != images_page.end(); ++it) {
+      images->insert(*it);
+    }
+    if (!images_page.empty()) {
+      last_read = images_page.rbegin()->first;
+    }
+    r = images_page.size();
+  } while (r == max_read);
+
+  return 0;
+}
+
+template <typename I>
+int Image<I>::list_children(I *ictx, const ParentSpec &parent_spec,
+                            PoolImageIds *pool_image_ids)
+{
+  CephContext *cct = ictx->cct;
+  int r = ictx->state->refresh_if_required();
+  if (r < 0) {
+    return r;
+  }
+
+  // no children for non-layered or old format image
+  if (!ictx->test_features(RBD_FEATURE_LAYERING, ictx->snap_lock)) {
+    return 0;
+  }
+
+  pool_image_ids->clear();
+  // search all pools for children depending on this snapshot
+  librados::Rados rados(ictx->md_ctx);
+  std::list<std::pair<int64_t, std::string> > pools;
+  r = rados.pool_list2(pools);
+  if (r < 0) {
+    lderr(cct) << "error listing pools: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  for (auto it = pools.begin(); it != pools.end(); ++it) {
+    int64_t base_tier;
+    r = rados.pool_get_base_tier(it->first, &base_tier);
+    if (r == -ENOENT) {
+      ldout(cct, 1) << "pool " << it->second << " no longer exists" << dendl;
+      continue;
+    } else if (r < 0) {
+      lderr(cct) << "error retrieving base tier for pool " << it->second
+                 << dendl;
+      return r;
+    }
+    if (it->first != base_tier) {
+      // pool is a cache; skip it
+      continue;
+    }
+
+    IoCtx ioctx;
+    r = rados.ioctx_create2(it->first, ioctx);
+    if (r == -ENOENT) {
+      ldout(cct, 1) << "pool " << it->second << " no longer exists" << dendl;
+      continue;
+    } else if (r < 0) {
+      lderr(cct) << "error accessing child image pool " << it->second
+                 << dendl;
+      return r;
+    }
+
+    set<string> image_ids;
+    r = cls_client::get_children(&ioctx, RBD_CHILDREN, parent_spec,
+                                 image_ids);
+    if (r < 0 && r != -ENOENT) {
+      lderr(cct) << "error reading list of children from pool " << it->second
+          << dendl;
+      return r;
+    }
+    pool_image_ids->insert({*it, image_ids});
+  }
+
+  return 0;
+}
+
+} // namespace api
+} // namespace librbd
+
+template class librbd::api::Image<librbd::ImageCtx>;