block-backend: add blk_get_max_iov()

Add a function to query BlockLimits.max_iov.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

2 files changed, 6 insertions, 0 deletions

diff --git a/block/block-backend.c b/block/block-backend.c
index 36ccc9e616..f41d326b3c 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1023,6 +1023,11 @@ int blk_get_max_transfer_length(BlockBackend *blk)
     }
 }
 
+int blk_get_max_iov(BlockBackend *blk)
+{
+    return blk->bs->bl.max_iov;
+}
+
 void blk_set_guest_block_size(BlockBackend *blk, int align)
 {
     blk->guest_block_size = align;
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index fb068ea47b..dc244760a1 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -146,6 +146,7 @@ void blk_lock_medium(BlockBackend *blk, bool locked);
 void blk_eject(BlockBackend *blk, bool eject_flag);
 int blk_get_flags(BlockBackend *blk);
 int blk_get_max_transfer_length(BlockBackend *blk);
+int blk_get_max_iov(BlockBackend *blk);
 void blk_set_guest_block_size(BlockBackend *blk, int align);
 void *blk_blockalign(BlockBackend *blk, size_t size);
 bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp);