Fuction to get drive mapping from qed images
Signed-off-by: Devin Nakamura <devin...@gmail.com>
---
block/qed.c | 32 ++++++++++++++++++++++++++++++++
1 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/block/qed.c b/block/qed.c
index 00cf895..dadb7f8 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1451,6 +1451,37 @@ static int bdrv_qed_check(BlockDriverState *bs,
BdrvCheckResult *result)
return qed_check(s, result, false);
}
+static int bdrv_qed_get_mapping(BlockDriverState *bs, uint64_t *guest_offset,
+ uint64_t *host_offset,
+ uint64_t *contiguous_bytes)
+{
+ BDRVQEDState *s = bs->opaque;
+ size_t l2_size = s->header.cluster_size * s->table_nelems;
+ uint64_t pos = *guest_offset + *contiguous_bytes;
+ uint64_t offset = pos;
+ size_t len = 0;
+ QEDRequest req = {.l2_table = NULL};
+ int ret;
+
+ if (pos >= s->header.image_size) {
+ *contiguous_bytes = 0;
+ return 0;
+ }
+
+ do {
+ pos += len;
+ ret = qed_find_cluster_sync(s, &req, pos, l2_size, &offset, &len);
+ } while (ret != QED_CLUSTER_FOUND && pos < s->header.image_size);
+ *guest_offset = pos;
+ *host_offset = offset;
+ if (pos >= s->header.image_size) {
+ *contiguous_bytes = 0;
+ } else {
+ *contiguous_bytes = len;
+ }
+ return 0;
+}
+
static QEMUOptionParameter qed_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
@@ -1497,6 +1528,7 @@ static BlockDriver bdrv_qed = {
.bdrv_get_info = bdrv_qed_get_info,
.bdrv_change_backing_file = bdrv_qed_change_backing_file,
.bdrv_check = bdrv_qed_check,
+ .bdrv_get_mapping = bdrv_qed_get_mapping,
};
static void bdrv_qed_init(void)
--
1.7.6.rc1
