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From baa218a4170b17e3699272a481ee04616c9432f0 Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Mon, 4 Feb 2019 21:08:22 +0100
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Subject: [PATCH 8/8] luks: Allow share-rw=on
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <20190204210822.10343-2-mreitz@redhat.com>
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Patchwork-id: 84228
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 1/1] luks: Allow share-rw=on
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Bugzilla: 1598119
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Yash Mankad <ymankad@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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From: Fam Zheng <famz@redhat.com>
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Format drivers such as qcow2 don't allow sharing the same image between
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two QEMU instances in order to prevent image corruptions, because of
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metadata cache. LUKS driver don't modify metadata except for when
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creating image, so it is safe to relax the permission. This makes
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share-rw=on property work on virtual devices.
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Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 497da8236ab2663a8108858ba7ea59aac21c5fe6)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/crypto.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/block/crypto.c b/block/crypto.c
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index 02f04f3..0bb0db6 100644
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--- a/block/crypto.c
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+++ b/block/crypto.c
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@@ -698,7 +698,9 @@ BlockDriver bdrv_crypto_luks = {
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.bdrv_probe = block_crypto_probe_luks,
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.bdrv_open = block_crypto_open_luks,
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.bdrv_close = block_crypto_close,
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- .bdrv_child_perm = bdrv_format_default_perms,
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+ /* This driver doesn't modify LUKS metadata except when creating image.
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+ * Allow share-rw=on as a special case. */
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+ .bdrv_child_perm = bdrv_filter_default_perms,
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.bdrv_co_create = block_crypto_co_create_luks,
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.bdrv_co_create_opts = block_crypto_co_create_opts_luks,
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.bdrv_co_truncate = block_crypto_co_truncate,
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--
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1.8.3.1
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