storage: Rework debugging of storage file access through storage driver

Print the debug statements of individual file access functions from the
main API functions instead of the individual backend functions.

Also enhance initialization debug messages on a per-backend basis.

src/storage/storage_backend_fs.c

@@ -1339,18 +1339,31 @@ virStorageBackend virStorageBackendNetFileSystem = {
 };
 
 
+static void
+virStorageFileBackendFileDeinit(virStorageSourcePtr src)
+{
+    VIR_DEBUG("deinitializing FS storage file %p (%s:%s)", src,
+              virStorageTypeToString(virStorageSourceGetActualType(src)),
+              src->path);
+
+}
+
+
+static int
+virStorageFileBackendFileInit(virStorageSourcePtr src)
+{
+    VIR_DEBUG("initializing FS storage file %p (%s:%s)", src,
+              virStorageTypeToString(virStorageSourceGetActualType(src)),
+              src->path);
+
+    return 0;
+}
+
+
 static int
 virStorageFileBackendFileUnlink(virStorageSourcePtr src)
 {
-    int ret;
-
-    ret = unlink(src->path);
-    /* preserve errno */
-
-    VIR_DEBUG("removing storage file %p(%s): ret=%d, errno=%d",
-              src, src->path, ret, errno);
-
-    return ret;
+    return unlink(src->path);
 }
 
 
@@ -1358,21 +1371,16 @@ static int
 virStorageFileBackendFileStat(virStorageSourcePtr src,
                               struct stat *st)
 {
-    int ret;
-
-    ret = stat(src->path, st);
-    /* preserve errno */
-
-    VIR_DEBUG("stat of storage file %p(%s): ret=%d, errno=%d",
-              src, src->path, ret, errno);
-
-    return ret;
+    return stat(src->path, st);
 }
 
 
 virStorageFileBackend virStorageFileBackendFile = {
     .type = VIR_STORAGE_TYPE_FILE,
 
+    .backendInit = virStorageFileBackendFileInit,
+    .backendDeinit = virStorageFileBackendFileDeinit,
+
     .storageFileUnlink = virStorageFileBackendFileUnlink,
     .storageFileStat = virStorageFileBackendFileStat,
 };
@@ -1381,6 +1389,9 @@ virStorageFileBackend virStorageFileBackendFile = {
 virStorageFileBackend virStorageFileBackendBlock = {
     .type = VIR_STORAGE_TYPE_BLOCK,
 
+    .backendInit = virStorageFileBackendFileInit,
+    .backendDeinit = virStorageFileBackendFileDeinit,
+
     .storageFileStat = virStorageFileBackendFileStat,
 };
 

src/storage/storage_backend_gluster.c

@@ -539,10 +539,12 @@ struct _virStorageFileBackendGlusterPriv {
 static void
 virStorageFileBackendGlusterDeinit(virStorageSourcePtr src)
 {
-    VIR_DEBUG("deinitializing gluster storage file %p(%s/%s)",
-              src, src->hosts[0].name, src->path);
     virStorageFileBackendGlusterPrivPtr priv = src->drv->priv;
 
+    VIR_DEBUG("deinitializing gluster storage file %p (gluster://%s:%s/%s%s)",
+              src, src->hosts->name, src->hosts->port ? src->hosts->port : "0",
+              src->volume, src->path);
+
     if (priv->vol)
         glfs_fini(priv->vol);
 
@@ -558,12 +560,14 @@ virStorageFileBackendGlusterInit(virStorageSourcePtr src)
     const char *hostname = host->name;
     int port = 0;
 
-    VIR_DEBUG("initializing gluster storage file %p(%s/%s)",
-              src, hostname, src->path);
+    VIR_DEBUG("initializing gluster storage file %p (gluster://%s:%s/%s%s)",
+              src, hostname, host->port ? host->port : "0",
+              NULLSTR(src->volume), src->path);
 
     if (!src->volume) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
-                       _("missing gluster volume name for path '%s'"), src->path);
+                       _("missing gluster volume name for path '%s'"),
+                       src->path);
         return -1;
     }
 
@@ -619,14 +623,8 @@ static int
 virStorageFileBackendGlusterUnlink(virStorageSourcePtr src)
 {
     virStorageFileBackendGlusterPrivPtr priv = src->drv->priv;
-    int ret;
 
-    ret = glfs_unlink(priv->vol, src->path);
-    /* preserve errno */
-
-    VIR_DEBUG("removing storage file %p(%s/%s): ret=%d, errno=%d",
-              src, src->hosts[0].name, src->path, ret, errno);
-    return ret;
+    return glfs_unlink(priv->vol, src->path);
 }
 
 
@@ -635,14 +633,8 @@ virStorageFileBackendGlusterStat(virStorageSourcePtr src,
                                  struct stat *st)
 {
     virStorageFileBackendGlusterPrivPtr priv = src->drv->priv;
-    int ret;
 
-    ret = glfs_stat(priv->vol, src->path, st);
-    /* preserve errno */
-
-    VIR_DEBUG("stat of storage file %p(%s/%s): ret=%d, errno=%d",
-              src, src->hosts[0].name, src->path, ret, errno);
-    return ret;
+    return glfs_stat(priv->vol, src->path, st);
 }
 
 

src/storage/storage_driver.c

@@ -2835,13 +2835,20 @@ virStorageFileInit(virStorageSourcePtr src)
 int
 virStorageFileCreate(virStorageSourcePtr src)
 {
+    int ret;
+
     if (!virStorageFileIsInitialized(src) ||
         !src->drv->backend->storageFileCreate) {
         errno = ENOSYS;
         return -2;
     }
 
-    return src->drv->backend->storageFileCreate(src);
+    ret = src->drv->backend->storageFileCreate(src);
+
+    VIR_DEBUG("created storage file %p: ret=%d, errno=%d",
+              src, ret, errno);
+
+    return ret;
 }
 
 
@@ -2858,13 +2865,20 @@ virStorageFileCreate(virStorageSourcePtr src)
 int
 virStorageFileUnlink(virStorageSourcePtr src)
 {
+    int ret;
+
     if (!virStorageFileIsInitialized(src) ||
         !src->drv->backend->storageFileUnlink) {
         errno = ENOSYS;
         return -2;
     }
 
-    return src->drv->backend->storageFileUnlink(src);
+    ret = src->drv->backend->storageFileUnlink(src);
+
+    VIR_DEBUG("unlinked storage file %p: ret=%d, errno=%d",
+              src, ret, errno);
+
+    return ret;
 }
 
 
@@ -2881,11 +2895,18 @@ int
 virStorageFileStat(virStorageSourcePtr src,
                    struct stat *st)
 {
+    int ret;
+
     if (!virStorageFileIsInitialized(src) ||
         !src->drv->backend->storageFileStat) {
         errno = ENOSYS;
         return -2;
     }
 
-    return src->drv->backend->storageFileStat(src, st);
+    ret = src->drv->backend->storageFileStat(src, st);
+
+    VIR_DEBUG("stat of storage file %p: ret=%d, errno=%d",
+              src, ret, errno);
+
+    return ret;
 }