MFC r275503:

Avoid unneeded malloc/memcpy/free if there is no metadata on disk.

Submitted by:	Dmitry Luhtionov <dmitryluhtionov@gmail.com>

2 files changed, 12 insertions, 10 deletions

diff --git a/sys/geom/raid/md_nvidia.c b/sys/geom/raid/md_nvidia.c
index eb2e493..9a8397c 100644
--- a/sys/geom/raid/md_nvidia.c
+++ b/sys/geom/raid/md_nvidia.c
@@ -256,23 +256,24 @@ nvidia_meta_read(struct g_consumer *cp)
 		    pp->name, error);
 		return (NULL);
 	}
-	meta = malloc(sizeof(*meta), M_MD_NVIDIA, M_WAITOK);
-	memcpy(meta, buf, min(sizeof(*meta), pp->sectorsize));
-	g_free(buf);
+	meta = (struct nvidia_raid_conf *)buf;
 
 	/* Check if this is an NVIDIA RAID struct */
 	if (strncmp(meta->nvidia_id, NVIDIA_MAGIC, strlen(NVIDIA_MAGIC))) {
 		G_RAID_DEBUG(1, "NVIDIA signature check failed on %s", pp->name);
-		free(meta, M_MD_NVIDIA);
+		g_free(buf);
 		return (NULL);
 	}
 	if (meta->config_size > 128 ||
 	    meta->config_size < 30) {
 		G_RAID_DEBUG(1, "NVIDIA metadata size looks wrong: %d",
 		    meta->config_size);
-		free(meta, M_MD_NVIDIA);
+		g_free(buf);
 		return (NULL);
 	}
+	meta = malloc(sizeof(*meta), M_MD_NVIDIA, M_WAITOK);
+	memcpy(meta, buf, min(sizeof(*meta), pp->sectorsize));
+	g_free(buf);
 
 	/* Check metadata checksum. */
 	for (checksum = 0, ptr = (uint32_t *)meta,
diff --git a/sys/geom/raid/md_sii.c b/sys/geom/raid/md_sii.c
index 5012dc5..8a982a6 100644
--- a/sys/geom/raid/md_sii.c
+++ b/sys/geom/raid/md_sii.c
@@ -277,15 +277,13 @@ sii_meta_read(struct g_consumer *cp)
 		    pp->name, error);
 		return (NULL);
 	}
-	meta = malloc(sizeof(*meta), M_MD_SII, M_WAITOK);
-	memcpy(meta, buf, min(sizeof(*meta), pp->sectorsize));
-	g_free(buf);
+	meta = (struct sii_raid_conf *)buf;
 
 	/* Check vendor ID. */
 	if (meta->vendor_id != 0x1095) {
 		G_RAID_DEBUG(1, "SiI vendor ID check failed on %s (0x%04x)",
 		    pp->name, meta->vendor_id);
-		free(meta, M_MD_SII);
+		g_free(buf);
 		return (NULL);
 	}
 
@@ -293,9 +291,12 @@ sii_meta_read(struct g_consumer *cp)
 	if (meta->version_major != 2) {
 		G_RAID_DEBUG(1, "SiI version check failed on %s (%d.%d)",
 		    pp->name, meta->version_major, meta->version_minor);
-		free(meta, M_MD_SII);
+		g_free(buf);
 		return (NULL);
 	}
+	meta = malloc(sizeof(*meta), M_MD_SII, M_WAITOK);
+	memcpy(meta, buf, min(sizeof(*meta), pp->sectorsize));
+	g_free(buf);
 
 	/* Check metadata checksum. */
 	for (checksum = 0, ptr = (uint16_t *)meta, i = 0; i <= 159; i++)