[libvirt] [PATCH v4 2/4] qemu: Always call virFileWrapperFdClose()

[Andrea Bolognani]

Right now we're reporting errors in virFileWrapperFdFree(),
but that's hardly the appropriate place to do so, as free
functions are supposed to do nothing more than release
allocated resources.

We want to move that code back into virFileWrapperFdClose(),
but before we can do that we need to make sure the function
is actually called every time we're done processing the
wrapped file. The cleanup path is the obvious candidate.

In a couple of cases we can just move the call, but for the
remaining ones we need to duplicate it instead in order not
to alter the existing behavior. We do, however, make sure
that in all cases a failure to properly close the wrapper
results in the overall operation being reported as failed.

Signed-off-by: Andrea Bolognani <abologna at redhat.com>
---
 src/qemu/qemu_driver.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index fe1b7801e9..323c7824be 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -3231,6 +3231,8 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
 
  cleanup:
     VIR_FORCE_CLOSE(fd);
+    if (qemuFileWrapperFDClose(vm, wrapperFd) < 0)
+        ret = -1;
     virFileWrapperFdFree(wrapperFd);
     virObjectUnref(cfg);
 
@@ -3834,9 +3836,11 @@ doCoreDump(virQEMUDriverPtr driver,
 
  cleanup:
     VIR_FORCE_CLOSE(fd);
+    if (qemuFileWrapperFDClose(vm, wrapperFd) < 0)
+        ret = -1;
+    virFileWrapperFdFree(wrapperFd);
     if (ret != 0)
         unlink(path);
-    virFileWrapperFdFree(wrapperFd);
     VIR_FREE(compressedpath);
     virObjectUnref(cfg);
     return ret;
@@ -7043,17 +7047,17 @@ qemuDomainRestoreFlags(virConnectPtr conn,
 
     ret = qemuDomainSaveImageStartVM(conn, driver, vm, &fd, data, path,
                                      false, QEMU_ASYNC_JOB_START);
-    if (virFileWrapperFdClose(wrapperFd) < 0)
-        VIR_WARN("Failed to close %s", path);
 
     qemuProcessEndJob(driver, vm);
 
  cleanup:
     virDomainDefFree(def);
     VIR_FORCE_CLOSE(fd);
+    if (virFileWrapperFdClose(wrapperFd) < 0)
+        ret = -1;
+    virFileWrapperFdFree(wrapperFd);
     virQEMUSaveDataFree(data);
     VIR_FREE(xmlout);
-    virFileWrapperFdFree(wrapperFd);
     if (vm && ret < 0)
         qemuDomainRemoveInactiveJob(driver, vm);
     virDomainObjEndAPI(&vm);
@@ -7316,14 +7320,14 @@ qemuDomainObjRestore(virConnectPtr conn,
 
     ret = qemuDomainSaveImageStartVM(conn, driver, vm, &fd, data, path,
                                      start_paused, asyncJob);
-    if (virFileWrapperFdClose(wrapperFd) < 0)
-        VIR_WARN("Failed to close %s", path);
 
  cleanup:
     virQEMUSaveDataFree(data);
     VIR_FREE(xmlout);
     virDomainDefFree(def);
     VIR_FORCE_CLOSE(fd);
+    if (virFileWrapperFdClose(wrapperFd) < 0)
+        ret = -1;
     virFileWrapperFdFree(wrapperFd);
     return ret;
 }
-- 
2.20.1