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From ec5408763c49cd0b63ee324bdc38a429ed1adeee Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Fri, 13 Mar 2020 12:34:29 +0000
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Subject: [PATCH 09/20] block/qcow2: Move bitmap reopen into
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bdrv_reopen_commit_post
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20200313123439.10548-4-kwolf@redhat.com>
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Patchwork-id: 94280
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 03/13] block/qcow2: Move bitmap reopen into bdrv_reopen_commit_post
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Bugzilla: 1790482 1805143
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Daniel P. Berrange <berrange@redhat.com>
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RH-Acked-by: Peter Krempa <pkrempa@redhat.com>
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From: Peter Krempa <pkrempa@redhat.com>
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The bitmap code requires writing the 'file' child when the qcow2 driver
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is reopened in read-write mode.
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If the 'file' child is being reopened due to a permissions change, the
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modification is commited yet when qcow2_reopen_commit is called. This
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means that any attempt to write the 'file' child will end with EBADFD
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as the original fd was already closed.
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Moving bitmap reopening to the new callback which is called after
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permission modifications are commited fixes this as the file descriptor
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will be replaced with the correct one.
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The above problem manifests itself when reopening 'qcow2' format layer
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which uses a 'file-posix' file child which was opened with the
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'auto-read-only' property set.
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Signed-off-by: Peter Krempa <pkrempa@redhat.com>
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Message-Id: <db118dbafe1955afbc0a18d3dd220931074ce349.1582893284.git.pkrempa@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 65eb7c85a3e62529e2bad782e94d5a7b11dd5a92)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block/qcow2.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/block/qcow2.c b/block/qcow2.c
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index 7c18721..83b1fc0 100644
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--- a/block/qcow2.c
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+++ b/block/qcow2.c
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@@ -1881,6 +1881,11 @@ fail:
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static void qcow2_reopen_commit(BDRVReopenState *state)
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{
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qcow2_update_options_commit(state->bs, state->opaque);
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+ g_free(state->opaque);
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+}
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+
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+static void qcow2_reopen_commit_post(BDRVReopenState *state)
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+{
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if (state->flags & BDRV_O_RDWR) {
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Error *local_err = NULL;
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@@ -1895,7 +1900,6 @@ static void qcow2_reopen_commit(BDRVReopenState *state)
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bdrv_get_node_name(state->bs));
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}
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}
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- g_free(state->opaque);
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}
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static void qcow2_reopen_abort(BDRVReopenState *state)
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@@ -5492,6 +5496,7 @@ BlockDriver bdrv_qcow2 = {
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.bdrv_close = qcow2_close,
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.bdrv_reopen_prepare = qcow2_reopen_prepare,
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.bdrv_reopen_commit = qcow2_reopen_commit,
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+ .bdrv_reopen_commit_post = qcow2_reopen_commit_post,
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.bdrv_reopen_abort = qcow2_reopen_abort,
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.bdrv_join_options = qcow2_join_options,
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.bdrv_child_perm = bdrv_format_default_perms,
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--
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1.8.3.1
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