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[Qemu-devel] [PATCH 1/2] block: don't lose data from last incomplete sec
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH 1/2] block: don't lose data from last incomplete sector |
Date: |
Wed, 18 Sep 2013 19:14:14 +0800 |
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 <address@hidden>
---
block.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block.c b/block.c
index a325efc..9b28ef9 100644
--- a/block.c
+++ b/block.c
@@ -2613,7 +2613,7 @@ 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,
--
1.8.3.1