block/io: use int64_t bytes in driver wrappers

We are generally moving to int64_t for both offset and bytes parameters
on all io paths.

Main motivation is realization of 64-bit write_zeroes operation for
fast zeroing large disk chunks, up to the whole disk.

We chose signed type, to be consistent with off_t (which is signed) and
with possibility for signed return type (where negative value means
error).

So, convert driver wrappers parameters which are already 64bit to
signed type.

Requests in block/io.c must never exceed BDRV_MAX_LENGTH (which is less
than INT64_MAX), which makes the conversion to signed 64bit type safe.

Add corresponding assertions.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20201211183934.169161-10-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

block/io.c

@@ -1125,7 +1125,7 @@ static void bdrv_co_io_em_complete(void *opaque, int ret)
 }
 
 static int coroutine_fn bdrv_driver_preadv(BlockDriverState *bs,
-                                           uint64_t offset, uint64_t bytes,
+                                           int64_t offset, int64_t bytes,
                                            QEMUIOVector *qiov,
                                            size_t qiov_offset, int flags)
 {
@@ -1135,6 +1135,7 @@ static int coroutine_fn bdrv_driver_preadv(BlockDriverState *bs,
     QEMUIOVector local_qiov;
     int ret;
 
+    bdrv_check_qiov_request(offset, bytes, qiov, qiov_offset, &error_abort);
     assert(!(flags & ~BDRV_REQ_MASK));
     assert(!(flags & BDRV_REQ_NO_FALLBACK));
 
@@ -1194,7 +1195,7 @@ static int coroutine_fn bdrv_driver_preadv(BlockDriverState *bs,
 }
 
 static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs,
-                                            uint64_t offset, uint64_t bytes,
+                                            int64_t offset, int64_t bytes,
                                             QEMUIOVector *qiov,
                                             size_t qiov_offset, int flags)
 {
@@ -1204,6 +1205,7 @@ static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs,
     QEMUIOVector local_qiov;
     int ret;
 
+    bdrv_check_qiov_request(offset, bytes, qiov, qiov_offset, &error_abort);
     assert(!(flags & ~BDRV_REQ_MASK));
     assert(!(flags & BDRV_REQ_NO_FALLBACK));
 
@@ -1274,14 +1276,16 @@ static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs,
 }
 
 static int coroutine_fn
-bdrv_driver_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
-                               uint64_t bytes, QEMUIOVector *qiov,
+bdrv_driver_pwritev_compressed(BlockDriverState *bs, int64_t offset,
+                               int64_t bytes, QEMUIOVector *qiov,
                                size_t qiov_offset)
 {
     BlockDriver *drv = bs->drv;
     QEMUIOVector local_qiov;
     int ret;
 
+    bdrv_check_qiov_request(offset, bytes, qiov, qiov_offset, &error_abort);
+
     if (!drv) {
         return -ENOMEDIUM;
     }