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-rw-r--r--block.c4
-rw-r--r--include/block/block_int.h3
2 files changed, 7 insertions, 0 deletions
diff --git a/block.c b/block.c
index 88f6d9b236..76fcc1d6d3 100644
--- a/block.c
+++ b/block.c
@@ -519,6 +519,7 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
return;
}
bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length;
+ bs->bl.max_transfer_length = bs->file->bl.max_transfer_length;
bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment;
} else {
bs->bl.opt_mem_alignment = 512;
@@ -533,6 +534,9 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
bs->bl.opt_transfer_length =
MAX(bs->bl.opt_transfer_length,
bs->backing_hd->bl.opt_transfer_length);
+ bs->bl.max_transfer_length =
+ MIN_NON_ZERO(bs->bl.max_transfer_length,
+ bs->backing_hd->bl.max_transfer_length);
bs->bl.opt_mem_alignment =
MAX(bs->bl.opt_mem_alignment,
bs->backing_hd->bl.opt_mem_alignment);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 8898c6c51b..a293e92852 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -289,6 +289,9 @@ typedef struct BlockLimits {
/* optimal transfer length in sectors */
int opt_transfer_length;
+ /* maximal transfer length in sectors */
+ int max_transfer_length;
+
/* memory alignment so that no bounce buffer is needed */
size_t opt_mem_alignment;
} BlockLimits;