[Qemu-devel] [PATCH 35/67] rbd: shift byte count as a 64-bit value

[Michael Roth]

From: Paolo Bonzini <pbonz...@redhat.com>

Otherwise, reads of more than 2GB fail.  Until commit
7bbca9e290a9c7c217b5a24fc6094e91e54bd05d, reads of 2^41
bytes succeeded at least theoretically.

In fact, pdiscard ought to receive a 64-bit integer as the
count for the same reason.

Reported by Coverity.

Fixes: 7bbca9e290a9c7c217b5a24fc6094e91e54bd05d
Cc: qemu-sta...@nongnu.org
Cc: kw...@redhat.com
Cc: ebl...@redhat.com
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
(cherry picked from commit e948f663e9334249c394b88926addcdd3f9e35cd)
Signed-off-by: Michael Roth <mdr...@linux.vnet.ibm.com>
---
 block/rbd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/rbd.c b/block/rbd.c
index 0106fea..5cefdbb 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -737,7 +737,7 @@ static BlockAIOCB *qemu_rbd_aio_readv(BlockDriverState *bs,
                                       void *opaque)
 {
     return rbd_start_aio(bs, sector_num << BDRV_SECTOR_BITS, qiov,
-                         nb_sectors << BDRV_SECTOR_BITS, cb, opaque,
+                         (int64_t) nb_sectors << BDRV_SECTOR_BITS, cb, opaque,
                          RBD_AIO_READ);
 }
 
@@ -749,7 +749,7 @@ static BlockAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
                                        void *opaque)
 {
     return rbd_start_aio(bs, sector_num << BDRV_SECTOR_BITS, qiov,
-                         nb_sectors << BDRV_SECTOR_BITS, cb, opaque,
+                         (int64_t) nb_sectors << BDRV_SECTOR_BITS, cb, opaque,
                          RBD_AIO_WRITE);
 }
 
-- 
1.9.1