|
 |
357786 |
From 3e0ff815da32944228b49c4ad33957c63dfd0f99 Mon Sep 17 00:00:00 2001
|
|
|
357786 |
From: John Snow <jsnow@redhat.com>
|
|
|
357786 |
Date: Mon, 10 Sep 2018 18:18:03 +0200
|
|
|
357786 |
Subject: [PATCH 25/25] blockdev: document transactional shortcomings
|
|
|
357786 |
|
|
|
357786 |
RH-Author: John Snow <jsnow@redhat.com>
|
|
|
357786 |
Message-id: <20180910181803.11781-26-jsnow@redhat.com>
|
|
|
357786 |
Patchwork-id: 82087
|
|
|
357786 |
O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 25/25] blockdev: document transactional shortcomings
|
|
|
357786 |
Bugzilla: 1626061
|
|
|
357786 |
RH-Acked-by: Max Reitz <mreitz@redhat.com>
|
|
|
357786 |
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
|
|
|
357786 |
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
|
|
|
357786 |
|
|
|
357786 |
Presently only the backup job really guarantees what one would consider
|
|
|
357786 |
transactional semantics. To guard against someone helpfully adding them
|
|
|
357786 |
in the future, document that there are shortcomings in the model that
|
|
|
357786 |
would need to be audited at that time.
|
|
|
357786 |
|
|
|
357786 |
Signed-off-by: John Snow <jsnow@redhat.com>
|
|
|
357786 |
Message-id: 20180906130225.5118-17-jsnow@redhat.com
|
|
|
357786 |
Reviewed-by: Jeff Cody <jcody@redhat.com>
|
|
|
357786 |
Reviewed-by: Max Reitz <mreitz@redhat.com>
|
|
|
357786 |
Signed-off-by: Max Reitz <mreitz@redhat.com>
|
|
|
357786 |
(cherry picked from commit 97169e9959811e92e14c42afa0ec1fdeb09715ea)
|
|
|
357786 |
Signed-off-by: John Snow <jsnow@redhat.com>
|
|
|
357786 |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
357786 |
---
|
|
|
357786 |
blockdev.c | 8 +++++++-
|
|
|
357786 |
1 file changed, 7 insertions(+), 1 deletion(-)
|
|
|
357786 |
|
|
|
357786 |
diff --git a/blockdev.c b/blockdev.c
|
|
|
357786 |
index 6325471..0eb6bba 100644
|
|
|
357786 |
--- a/blockdev.c
|
|
|
357786 |
+++ b/blockdev.c
|
|
|
357786 |
@@ -2333,7 +2333,13 @@ static const BlkActionOps actions[] = {
|
|
|
357786 |
.instance_size = sizeof(BlockDirtyBitmapState),
|
|
|
357786 |
.prepare = block_dirty_bitmap_disable_prepare,
|
|
|
357786 |
.abort = block_dirty_bitmap_disable_abort,
|
|
|
357786 |
- }
|
|
|
357786 |
+ },
|
|
|
357786 |
+ /* Where are transactions for MIRROR, COMMIT and STREAM?
|
|
|
357786 |
+ * Although these blockjobs use transaction callbacks like the backup job,
|
|
|
357786 |
+ * these jobs do not necessarily adhere to transaction semantics.
|
|
|
357786 |
+ * These jobs may not fully undo all of their actions on abort, nor do they
|
|
|
357786 |
+ * necessarily work in transactions with more than one job in them.
|
|
|
357786 |
+ */
|
|
|
357786 |
};
|
|
|
357786 |
|
|
|
357786 |
/**
|
|
|
357786 |
--
|
|
|
357786 |
1.8.3.1
|
|
|
357786 |
|