libcephfs: add ceph_ll_lookup_root()

Signed-off-by: Andrey Kuznetsov <Andrey_Kuznetsov@epam.com>

4 files changed, 25 insertions, 0 deletions

diff --git a/src/client/Client.cc b/src/client/Client.cc
index d6fcb0f51a1..8b9185165f1 100644
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -256,6 +256,12 @@ inodeno_t Client::get_root_ino()
   return root->ino;
 }
 
+Inode *Client::get_root()
+{
+  root->ll_get();
+  return root;
+}
+
 
 // debug crapola
 
diff --git a/src/client/Client.h b/src/client/Client.h
index b9d83cc2a70..baeb8d5ebdb 100644
--- a/src/client/Client.h
+++ b/src/client/Client.h
@@ -419,6 +419,7 @@ protected:
   client_t get_nodeid() { return whoami; }
 
   inodeno_t get_root_ino();
+  Inode *get_root();
 
   int init()  WARN_UNUSED_RESULT;
   void shutdown();
diff --git a/src/include/cephfs/libcephfs.h b/src/include/cephfs/libcephfs.h
index 824f4be05be..4ba63069064 100644
--- a/src/include/cephfs/libcephfs.h
+++ b/src/include/cephfs/libcephfs.h
@@ -1207,6 +1207,15 @@ int ceph_debug_get_file_caps(class ceph_mount_info *cmount, const char *path);
 /* Low Level */
 struct Inode *ceph_ll_get_inode(struct ceph_mount_info *cmount,
 				vinodeno_t vino);
+/**
+ * Get the root inode of FS. Increase counter of references for root Inode. You must call ceph_ll_forget for it!
+ *
+ * @param cmount the ceph mount handle to use.
+ * @param parent pointer to pointer to Inode struct. Pointer to root inode will be returned
+ * @returns 0 if all good
+ */
+int ceph_ll_lookup_root(struct ceph_mount_info *cmount,
+                  Inode **parent);
 int ceph_ll_lookup(struct ceph_mount_info *cmount, struct Inode *parent,
 		   const char *name, struct stat *attr,
 		   Inode **out, int uid, int gid);
diff --git a/src/libcephfs.cc b/src/libcephfs.cc
index 58ad819dd1a..885ee02a288 100644
--- a/src/libcephfs.cc
+++ b/src/libcephfs.cc
@@ -1154,6 +1154,15 @@ extern "C" int ceph_get_pool_replication(class ceph_mount_info *cmount,
 }
 /* Low-level exports */
 
+extern "C" int ceph_ll_lookup_root(struct ceph_mount_info *cmount,
+                  Inode **parent)
+{
+  *parent = cmount->get_client()->get_root();
+  if (*parent)
+    return 0;
+  return EFAULT;
+}
+
 extern "C" struct Inode *ceph_ll_get_inode(class ceph_mount_info *cmount,
 					   vinodeno_t vino)
 {