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>

diff --git a/src/libcephfs.cc b/src/libcephfs.cc
index 9fc20f731c523442b0112a6978ec99377a3a57fa..ce1b6ccd0b05af277b067167f802f5b38f09b72d 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 {