[libvirt] [PATCH v3 5/9] virstoragefile: change backingStore to backingStores.
The backingStore field was a virStorageSourcePtr.
because a quorum can contain more that one backingStore at the same level
it's now a 'virStorageSourcePtr *'.
This patch rename src->backingStore to src->backingStores,
add a static function virStorageSourceExpandBackingStore
(virStorageSourcePushBackingStore in the V2) and made the necessary modification to
virStorageSourceSetBackingStore and virStorageSourceGetBackingStore.
virStorageSourceSetBackingStore can now expand size of src->backingStores
by calling virStorageSourceExpandBackingStore if necessary.
Signed-off-by: Matthias Gatto <matthias.gatto(a)outscale.com>
---
src/util/virstoragefile.c | 69 +++++++++++++++++++++++++++++++++++++++++------
src/util/virstoragefile.h | 3 ++-
2 files changed, 63 insertions(+), 9 deletions(-)
diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index d573aba..2a5321c 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1798,21 +1798,66 @@ virStorageSourcePoolDefCopy(const virStorageSourcePoolDef *src)
}
+/**
+ * virStorageSourceGetBackingStore:
+ * @src: virStorageSourcePtr containing the backing stores
+ * @pos: position of the backing store to get
+ *
+ * return the backingStore at the position of @pos
+ */
virStorageSourcePtr
-virStorageSourceGetBackingStore(const virStorageSource *src,
- size_t pos ATTRIBUTE_UNUSED)
+virStorageSourceGetBackingStore(const virStorageSource *src, size_t pos)
+{
+ if (!src || !src->backingStores || pos >= src->nBackingStores)
+ return NULL;
+ return src->backingStores[pos];
+}
+
+
+/**
+ * virStorageSourcePushBackingStore:
+ *
+ * Expand src->backingStores and update src->nBackingStores
+ */
+static bool
+virStorageSourceExpandBackingStore(virStorageSourcePtr src, size_t nbr)
{
- return src->backingStore;
+ if (!src)
+ return false;
+ if (src->nBackingStores > 0) {
+ if (VIR_EXPAND_N(src->backingStores, src->nBackingStores, nbr) < 0)
+ return false;
+ } else {
+ if (VIR_ALLOC_N(src->backingStores, nbr) < 0)
+ return false;
+ src->nBackingStores += nbr;
+ }
+ return true;
}
+/**
+ * virStorageSourceSetBackingStore:
+ * @src: virStorageSourcePtr to hold @backingStore
+ * @backingStore: backingStore to store
+ * @pos: position of the backing store to store
+ *
+ * Set @backingStore at @pos in src->backingStores.
+ * If src->backingStores don't have the space to contain
+ * @backingStore, we expand src->backingStores
+ */
bool
virStorageSourceSetBackingStore(virStorageSourcePtr src,
virStorageSourcePtr backingStore,
- size_t pos ATTRIBUTE_UNUSED)
+ size_t pos)
{
- src->backingStore = backingStore;
- return src->backingStore;
+ if (!src)
+ return false;
+ if (pos >= src->nBackingStores &&
+ !virStorageSourceExpandBackingStore(src, pos - src->nBackingStores + 1))
+ return false;
+ src->backingStores[pos] = backingStore;
+ return true;
}
@@ -2023,6 +2068,8 @@ virStorageSourceIsEmpty(virStorageSourcePtr src)
void
virStorageSourceBackingStoreClear(virStorageSourcePtr def)
{
+ size_t i;
+
if (!def)
return;
@@ -2030,8 +2077,14 @@ virStorageSourceBackingStoreClear(virStorageSourcePtr def)
VIR_FREE(def->backingStoreRaw);
/* recursively free backing chain */
- virStorageSourceFree(virStorageSourceGetBackingStore(def, 0));
- virStorageSourceSetBackingStore(def, NULL, 0);
+ for (i = 0; i < def->nBackingStores; ++i)
+ virStorageSourceFree(virStorageSourceGetBackingStore(def, i));
+ if (def->nBackingStores > 0) {
+ /* in this case def->backingStores is treat as an array so we have to free
it*/
+ VIR_FREE(def->backingStores);
+ }
+ def->nBackingStores = 0;
+ def->backingStores = NULL;
}
diff --git a/src/util/virstoragefile.h b/src/util/virstoragefile.h
index 85b8d6e..b94f9d9 100644
--- a/src/util/virstoragefile.h
+++ b/src/util/virstoragefile.h
@@ -270,7 +270,8 @@ struct _virStorageSource {
bool shared;
/* backing chain of the storage source */
- virStorageSourcePtr backingStore;
+ virStorageSourcePtr *backingStores;
+ size_t nBackingStores;
/* metadata for storage driver access to remote and local volumes */
virStorageDriverDataPtr drv;
--
1.8.3.1