[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH for-2.6] vpc: fix return value check for blk_pwrite
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH for-2.6] vpc: fix return value check for blk_pwrite |
Date: |
Thu, 7 Apr 2016 16:52:34 +0200 |
bdrv_pwrite_sync used to return zero or negative error, while blk_pwrite returns
the number of written bytes when successful. This caused VPC image creation
to fail spectacularly: it wrote the first 512 bytes, and then exited immediately
because of the non-zero answer from blk_pwrite. But the truly spectacular part
is that it returns a positive value (the 512 that blk_pwrite returned) causing
everyone to believe that it succeeded.
This fixes qemu-iotests with vpc format.
Fixes: b8f45cdf7827e39f9a1e6cc446f5972cc6144237
Signed-off-by: Paolo Bonzini <address@hidden>
---
block/vpc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/vpc.c b/block/vpc.c
index 8830b5b..3713ec3 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -775,7 +775,7 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t
*buf,
num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512);
ret = blk_pwrite(blk, offset, buf, HEADER_SIZE);
- if (ret) {
+ if (ret < 0) {
goto fail;
}
--
1.8.3.1
- [Qemu-devel] [PATCH for-2.6] vpc: fix return value check for blk_pwrite,
Paolo Bonzini <=