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[Qemu-commits] [COMMIT 5f34bdf] fix asynchronous ioctls
From: |
Anthony Liguori |
Subject: |
[Qemu-commits] [COMMIT 5f34bdf] fix asynchronous ioctls |
Date: |
Fri, 08 May 2009 20:53:36 -0000 |
From: Christoph Hellwig <address@hidden>
posix_aio_read expect aio requests to return the number of bytes
requests to be successfull, so we need to fake this up for ioctls.
Signed-off-by: Christoph Hellwig <address@hidden>
Signed-off-by: Anthony Liguori <address@hidden>
diff --git a/posix-aio-compat.c b/posix-aio-compat.c
index c7fdac7..e9fc9fa 100644
--- a/posix-aio-compat.c
+++ b/posix-aio-compat.c
@@ -90,7 +90,16 @@ static size_t handle_aiocb_ioctl(struct qemu_paiocb *aiocb)
ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd,
aiocb->aio_ioctl_buf);
if (ret == -1)
return -errno;
- return ret;
+
+ /*
+ * This looks weird, but the aio code only consideres a request
+ * successfull if it has written the number full number of bytes.
+ *
+ * Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command,
+ * so in fact we return the ioctl command here to make posix_aio_read()
+ * happy..
+ */
+ return aiocb->aio_nbytes;
}
#ifdef HAVE_PREADV
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