[PATCH v2 4/9] qemu_virtiofs: Separate PID read code into qemuVirtioFSGetPid

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

In near future it will be necessary to know the PID of virtiofsd
started for QEMU. Move the code into a separate function
(qemuVirtioFSGetPid()) and export it in the header file.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
Reviewed-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
 src/qemu/qemu_virtiofs.c | 38 +++++++++++++++++++++++++-------------
 src/qemu/qemu_virtiofs.h |  5 +++++
 2 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/src/qemu/qemu_virtiofs.c b/src/qemu/qemu_virtiofs.c
index ce55286ab5..2fd4b9f987 100644
--- a/src/qemu/qemu_virtiofs.c
+++ b/src/qemu/qemu_virtiofs.c
@@ -323,26 +323,38 @@ qemuVirtioFSStop(virQEMUDriver *driver G_GNUC_UNUSED,
 }
 
 
+
+int
+qemuVirtioFSGetPid(virDomainObj *vm,
+                   virDomainFSDef *fs,
+                   pid_t *pid)
+{
+    g_autofree char *pidfile = NULL;
+    int rc;
+
+    if (!(pidfile = qemuVirtioFSCreatePidFilename(vm, fs->info.alias)))
+        return -1;
+
+    rc = virPidFileReadPathIfAlive(pidfile, pid, NULL);
+    if (rc < 0 || *pid == (pid_t) -1) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("virtiofsd died unexpectedly"));
+        return -1;
+    }
+
+    return 0;
+}
+
+
 int
 qemuVirtioFSSetupCgroup(virDomainObj *vm,
                         virDomainFSDef *fs,
                         virCgroup *cgroup)
 {
-    g_autofree char *pidfile = NULL;
     pid_t pid = -1;
-    int rc;
 
-    if (!(pidfile = qemuVirtioFSCreatePidFilename(vm, fs->info.alias)))
-        return -1;
-
-    rc = virPidFileReadPathIfAlive(pidfile, &pid, NULL);
-    if (rc < 0 || pid == (pid_t) -1) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                       _("virtiofsd died unexpectedly"));
-        return -1;
-    }
-
-    if (virCgroupAddProcess(cgroup, pid) < 0)
+    if (qemuVirtioFSGetPid(vm, fs, &pid) < 0 ||
+        virCgroupAddProcess(cgroup, pid) < 0)
         return -1;
 
     return 0;
diff --git a/src/qemu/qemu_virtiofs.h b/src/qemu/qemu_virtiofs.h
index 5463acef98..dd3fbfa555 100644
--- a/src/qemu/qemu_virtiofs.h
+++ b/src/qemu/qemu_virtiofs.h
@@ -35,6 +35,11 @@ qemuVirtioFSStop(virQEMUDriver *driver,
                  virDomainObj *vm,
                  virDomainFSDef *fs);
 
+int
+qemuVirtioFSGetPid(virDomainObj *vm,
+                   virDomainFSDef *fs,
+                   pid_t *pid);
+
 int
 qemuVirtioFSSetupCgroup(virDomainObj *vm,
                         virDomainFSDef *fs,
-- 
2.35.1