* Patch "Drivers: hv: fcopy: restore correct transfer length" has been added to the 4.4-stable tree
@ 2017-10-10 15:13 gregkh
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From: gregkh @ 2017-10-10 15:13 UTC (permalink / raw)
To: olaf, gregkh, kys; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
Drivers: hv: fcopy: restore correct transfer length
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drivers-hv-fcopy-restore-correct-transfer-length.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 549e658a0919e355a2b2144dc380b3729bef7f3e Mon Sep 17 00:00:00 2001
From: Olaf Hering <olaf@aepfle.de>
Date: Thu, 21 Sep 2017 23:41:48 -0700
Subject: Drivers: hv: fcopy: restore correct transfer length
From: Olaf Hering <olaf@aepfle.de>
commit 549e658a0919e355a2b2144dc380b3729bef7f3e upstream.
Till recently the expected length of bytes read by the
daemon did depend on the context. It was either hv_start_fcopy or
hv_do_fcopy. The daemon had a buffer size of two pages, which was much
larger than needed.
Now the expected length of bytes read by the
daemon changed slightly. For START_FILE_COPY it is still the size of
hv_start_fcopy. But for WRITE_TO_FILE and the other operations it is as
large as the buffer that arrived via vmbus. In case of WRITE_TO_FILE
that is slightly larger than a struct hv_do_fcopy. Since the buffer in
the daemon was still larger everything was fine.
Currently, the daemon reads only what is actually needed.
The new buffer layout is as large as a struct hv_do_fcopy, for the
WRITE_TO_FILE operation. Since the kernel expects a slightly larger
size, hvt_op_read will return -EINVAL because the daemon will read
slightly less than expected. Address this by restoring the expected
buffer size in case of WRITE_TO_FILE.
Fixes: 'c7e490fc23eb ("Drivers: hv: fcopy: convert to hv_utils_transport")'
Fixes: '3f2baa8a7d2e ("Tools: hv: update buffer handling in hv_fcopy_daemon")'
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/hv/hv_fcopy.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -155,6 +155,10 @@ static void fcopy_send_data(struct work_
out_src = smsg_out;
break;
+ case WRITE_TO_FILE:
+ out_src = fcopy_transaction.fcopy_msg;
+ out_len = sizeof(struct hv_do_fcopy);
+ break;
default:
out_src = fcopy_transaction.fcopy_msg;
out_len = fcopy_transaction.recv_len;
Patches currently in stable-queue which might be from olaf@aepfle.de are
queue-4.4/drivers-hv-fcopy-restore-correct-transfer-length.patch
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2017-10-10 15:13 Patch "Drivers: hv: fcopy: restore correct transfer length" has been added to the 4.4-stable tree gregkh
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