diff --git a/include/block/block_int.h b/include/block/block_int.h
index c8daba608b..3c2a1d741a 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -975,13 +975,13 @@ int coroutine_fn bdrv_co_preadv(BdrvChild *child,
     int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
     BdrvRequestFlags flags);
 int coroutine_fn bdrv_co_preadv_part(BdrvChild *child,
-    int64_t offset, unsigned int bytes,
+    int64_t offset, int64_t bytes,
     QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags);
 int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
     int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
     BdrvRequestFlags flags);
 int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child,
-    int64_t offset, unsigned int bytes,
+    int64_t offset, int64_t bytes,
     QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags);
 
 static inline int coroutine_fn bdrv_co_pread(BdrvChild *child,
diff --git a/block/io.c b/block/io.c
index d336e4e691..d7fd429345 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1488,7 +1488,7 @@ static void bdrv_padding_destroy(BdrvRequestPadding *pad)
  */
 static bool bdrv_pad_request(BlockDriverState *bs,
                              QEMUIOVector **qiov, size_t *qiov_offset,
-                             int64_t *offset, unsigned int *bytes,
+                             int64_t *offset, int64_t *bytes,
                              BdrvRequestPadding *pad)
 {
     if (!bdrv_init_padding(bs, *offset, *bytes, pad)) {
@@ -1515,7 +1515,7 @@ int coroutine_fn bdrv_co_preadv(BdrvChild *child,
 
 /* To be called between exactly one pair of bdrv_inc/dec_in_flight() */
 static int coroutine_fn bdrv_do_preadv_part(BdrvChild *child,
-    int64_t offset, unsigned int bytes,
+    int64_t offset, int64_t bytes,
     QEMUIOVector *qiov, size_t qiov_offset,
     BdrvRequestFlags flags)
 {
@@ -1524,7 +1524,7 @@ static int coroutine_fn bdrv_do_preadv_part(BdrvChild *child,
     BdrvRequestPadding pad;
     int ret;
 
-    trace_bdrv_co_preadv(bs, offset, bytes, flags);
+    trace_bdrv_co_preadv_part(bs, offset, bytes, flags);
 
     ret = bdrv_check_byte_request(bs, offset, bytes);
     if (ret < 0) {
@@ -1562,7 +1562,7 @@ static int coroutine_fn bdrv_do_preadv_part(BdrvChild *child,
 }
 
 int coroutine_fn bdrv_co_preadv_part(BdrvChild *child,
-    int64_t offset, unsigned int bytes,
+    int64_t offset, int64_t bytes,
     QEMUIOVector *qiov, size_t qiov_offset,
     BdrvRequestFlags flags)
 {
@@ -1866,7 +1866,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
 
 static int coroutine_fn bdrv_co_do_zero_pwritev(BdrvChild *child,
                                                 int64_t offset,
-                                                unsigned int bytes,
+                                                int64_t bytes,
                                                 BdrvRequestFlags flags,
                                                 BdrvTrackedRequest *req)
 {
@@ -1941,7 +1941,7 @@ int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
 
 /* To be called between exactly one pair of bdrv_inc/dec_in_flight() */
 static int coroutine_fn bdrv_do_pwritev_part(BdrvChild *child,
-    int64_t offset, unsigned int bytes, QEMUIOVector *qiov, size_t qiov_offset,
+    int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset,
     BdrvRequestFlags flags)
 {
     BlockDriverState *bs = child->bs;
@@ -1950,7 +1950,7 @@ static int coroutine_fn bdrv_do_pwritev_part(BdrvChild *child,
     BdrvRequestPadding pad;
     int ret;
 
-    trace_bdrv_co_pwritev(child->bs, offset, bytes, flags);
+    trace_bdrv_co_pwritev_part(child->bs, offset, bytes, flags);
 
     if (!bs->drv) {
         return -ENOMEDIUM;
@@ -2009,7 +2009,7 @@ out:
 }
 
 int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child,
-    int64_t offset, unsigned int bytes, QEMUIOVector *qiov, size_t qiov_offset,
+    int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset,
     BdrvRequestFlags flags)
 {
     int ret;
diff --git a/block/trace-events b/block/trace-events
index 179b47bf63..dd367a9b19 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -11,8 +11,8 @@ blk_root_attach(void *child, void *blk, void *bs) "child %p blk %p bs %p"
 blk_root_detach(void *child, void *blk, void *bs) "child %p blk %p bs %p"
 
 # io.c
-bdrv_co_preadv(void *bs, int64_t offset, int64_t nbytes, unsigned int flags) "bs %p offset %"PRId64" nbytes %"PRId64" flags 0x%x"
-bdrv_co_pwritev(void *bs, int64_t offset, int64_t nbytes, unsigned int flags) "bs %p offset %"PRId64" nbytes %"PRId64" flags 0x%x"
+bdrv_co_preadv_part(void *bs, int64_t offset, int64_t bytes, int flags) "bs %p offset %" PRId64 " bytes %" PRId64 " flags 0x%x"
+bdrv_co_pwritev_part(void *bs, int64_t offset, int64_t bytes, int flags) "bs %p offset %" PRId64 " bytes %" PRId64 " flags 0x%x"
 bdrv_co_pwrite_zeroes(void *bs, int64_t offset, int count, int flags) "bs %p offset %"PRId64" count %d flags 0x%x"
 bdrv_co_do_copy_on_readv(void *bs, int64_t offset, int64_t bytes, int64_t cluster_offset, int64_t cluster_bytes) "bs %p offset %" PRId64 " bytes %" PRId64 " cluster_offset %" PRId64 " cluster_bytes %" PRId64
 bdrv_co_copy_range_from(void *src, uint64_t src_offset, void *dst, uint64_t dst_offset, uint64_t bytes, int read_flags, int write_flags) "src %p offset %"PRIu64" dst %p offset %"PRIu64" bytes %"PRIu64" rw flags 0x%x 0x%x"
