libcephfs: getcwd after chdir for API constraint

libcephfs semantics require that the old path to the cwd be returned when
getcwd is encounters an unlinked directory in the current working directory.

Signed-off-by: Patrick Donnelly <pdonnell@ibm.com>
(cherry picked from commit c7c5089ff95d6c68e009686bf4ff74772ad4ff67)

diff --git a/src/libcephfs.cc b/src/libcephfs.cc
index f1188dab080b8f40c268bbb32e8eac1a3d1d134f..f492562c771e1bcfa6d2d8403f74c5b622ffb490 100644 (file)
--- a/src/libcephfs.cc
+++ b/src/libcephfs.cc
@@ -322,7 +322,15 @@ public:
 
   int chdir(const char *to, const UserPerm& perms)
   {
-    return client->chdir(to, perms);
+    int rc = client->chdir(to, perms);
+    if (rc == 0) {
+      /* Current API requires "cwd" to be refreshed after every chdir so that
+       * getcwd on an unlinked cwd will still return the old path. Note:
+       * Client::getcwd now returns an error but leaves the "cwd" string
+       * unmodified for this purpose. */
+      client->getcwd(cwd, perms);
+    }
+    return rc;
   }
 
   CephContext *get_ceph_context() const {