aboutsummaryrefslogtreecommitdiff
path: root/block.c
diff options
context:
space:
mode:
authorFam Zheng <famz@redhat.com>2013-09-18 19:14:14 +0800
committerStefan Hajnoczi <stefanha@redhat.com>2013-09-20 19:27:26 +0200
commitbcb9d66e8590151967e1dbe3724eec7ec71392e0 (patch)
tree1e2d79ec373aa30aade110774e6df3f452d88201 /block.c
parent0f39ac9a07cc10278e37d87076b143008f28aa3b (diff)
block: don't lose data from last incomplete sector
To read the last sector that is not aligned to sector boundary, current code for growable backends, since commit 893a8f6 "block: Produce zeros when protocols reading beyond end of file", drops the data and directly returns zeroes. That is incorrect. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block.c')
-rw-r--r--block.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block.c b/block.c
index e176c6f3bc..ea4956d6c7 100644
--- a/block.c
+++ b/block.c
@@ -2669,7 +2669,7 @@ static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs,
goto out;
}
- total_sectors = len >> BDRV_SECTOR_BITS;
+ total_sectors = (len + BDRV_SECTOR_SIZE - 1) >> BDRV_SECTOR_BITS;
max_nb_sectors = MAX(0, total_sectors - sector_num);
if (max_nb_sectors > 0) {
ret = drv->bdrv_co_readv(bs, sector_num,