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[Qemu-devel] [PATCH 1/2] fix asynchronous ioctls
From: |
Christoph Hellwig |
Subject: |
[Qemu-devel] [PATCH 1/2] fix asynchronous ioctls |
Date: |
Tue, 28 Apr 2009 11:57:02 +0200 |
User-agent: |
Mutt/1.3.28i |
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.
[NB: this function is formatted using tabs, so the new code is too.
Or should I convert the whole function in my patch?]
Signed-off-by: Christoph Hellwig <address@hidden>
Index: qemu/posix-aio-compat.c
===================================================================
--- qemu.orig/posix-aio-compat.c 2009-04-28 11:42:33.801074561 +0200
+++ qemu/posix-aio-compat.c 2009-04-28 11:44:18.392076590 +0200
@@ -90,7 +90,16 @@ static size_t handle_aiocb_ioctl(struct
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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