nbd: Honor server's advertised minimum block size

[mirror_qemu.git] / block / nbd.c

diff --git a/block/nbd.c b/block/nbd.c
index ef81a9f53baaf1a09ed50af1ed09d741f947280a..69b5fd5e8fabd18d548cba073053571b872245d0 100644 (file)
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -474,8 +474,10 @@ static int nbd_co_flush(BlockDriverState *bs)
 static void nbd_refresh_limits(BlockDriverState *bs, Error **errp)
 {
     NBDClientSession *s = nbd_get_client_session(bs);
+    uint32_t min = s->info.min_block;
     uint32_t max = MIN_NON_ZERO(NBD_MAX_BUFFER_SIZE, s->info.max_block);
 
+    bs->bl.request_alignment = min ? min : BDRV_SECTOR_SIZE;
     bs->bl.max_pdiscard = max;
     bs->bl.max_pwrite_zeroes = max;
     bs->bl.max_transfer = max;