[libvirt] [PATCH v10 15/19] backup: qemu: Add directory for tracking checkpoints

[Eric Blake]

This is similar to the existing directory for snapshots; the domain
will save one xml file per checkpoint, for reloading on the next
libvirtd restart.  Fortunately, since checkpoints mandate RNG
validation, we are assured that the checkpoint name will be usable as
a file name (no abuse of '../escape' as a checkpoint name, for
example).

Signed-off-by: Eric Blake <eblake at redhat.com>
---
 src/qemu/qemu_conf.h   |  2 ++
 src/qemu/qemu_conf.c   |  5 +++++
 src/qemu/qemu_driver.c | 12 ++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h
index 2229b76e89..962df4f52c 100644
--- a/src/qemu/qemu_conf.h
+++ b/src/qemu/qemu_conf.h
@@ -28,6 +28,7 @@
 #include "capabilities.h"
 #include "network_conf.h"
 #include "domain_conf.h"
+#include "checkpoint_conf.h"
 #include "snapshot_conf.h"
 #include "domain_event.h"
 #include "virthread.h"
@@ -101,6 +102,7 @@ struct _virQEMUDriverConfig {
     char *cacheDir;
     char *saveDir;
     char *snapshotDir;
+    char *checkpointDir;
     char *channelTargetDir;
     char *nvramDir;
     char *swtpmStorageDir;
diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index e0195dac29..7a02ea5b07 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -160,6 +160,8 @@ virQEMUDriverConfigPtr virQEMUDriverConfigNew(bool privileged)
             goto error;
         if (virAsprintf(&cfg->snapshotDir, "%s/snapshot", cfg->libDir) < 0)
             goto error;
+        if (virAsprintf(&cfg->checkpointDir, "%s/checkpoint", cfg->libDir) < 0)
+            goto error;
         if (virAsprintf(&cfg->autoDumpPath, "%s/dump", cfg->libDir) < 0)
             goto error;
         if (virAsprintf(&cfg->channelTargetDir,
@@ -223,6 +225,8 @@ virQEMUDriverConfigPtr virQEMUDriverConfigNew(bool privileged)
             goto error;
         if (virAsprintf(&cfg->snapshotDir, "%s/qemu/snapshot", cfg->configBaseDir) < 0)
             goto error;
+        if (virAsprintf(&cfg->checkpointDir, "%s/qemu/checkpoint", cfg->configBaseDir) < 0)
+            goto error;
         if (virAsprintf(&cfg->autoDumpPath, "%s/qemu/dump", cfg->configBaseDir) < 0)
             goto error;
         if (virAsprintf(&cfg->channelTargetDir,
@@ -335,6 +339,7 @@ static void virQEMUDriverConfigDispose(void *obj)
     VIR_FREE(cfg->cacheDir);
     VIR_FREE(cfg->saveDir);
     VIR_FREE(cfg->snapshotDir);
+    VIR_FREE(cfg->checkpointDir);
     VIR_FREE(cfg->channelTargetDir);
     VIR_FREE(cfg->nvramDir);

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 065e0a1bd8..fae2bd3b08 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -655,6 +655,11 @@ qemuStateInitialize(bool privileged,
                              cfg->snapshotDir);
         goto error;
     }
+    if (virFileMakePath(cfg->checkpointDir) < 0) {
+        virReportSystemError(errno, _("Failed to create checkpoint dir %s"),
+                             cfg->checkpointDir);
+        goto error;
+    }
     if (virFileMakePath(cfg->autoDumpPath) < 0) {
         virReportSystemError(errno, _("Failed to create dump dir %s"),
                              cfg->autoDumpPath);
@@ -766,6 +771,13 @@ qemuStateInitialize(bool privileged,
                                  (int)cfg->group);
             goto error;
         }
+        if (chown(cfg->checkpointDir, cfg->user, cfg->group) < 0) {
+            virReportSystemError(errno,
+                                 _("unable to set ownership of '%s' to %d:%d"),
+                                 cfg->checkpointDir, (int)cfg->user,
+                                 (int)cfg->group);
+            goto error;
+        }
         if (chown(cfg->autoDumpPath, cfg->user, cfg->group) < 0) {
             virReportSystemError(errno,
                                  _("unable to set ownership of '%s' to %d:%d"),
-- 
2.20.1