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[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 
     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;

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