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From 4118dc26c6ad7a69c11522d25ead648ffdf0088e Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Wed, 3 Apr 2019 18:18:43 +0200
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Subject: [PATCH 138/163] nbd: change error checking order for bitmaps
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20190403181857.9693-8-jsnow@redhat.com>
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Patchwork-id: 85414
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 07/21] nbd: change error checking order for bitmaps
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Bugzilla: 1677073
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
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Check that the bitmap is not in use prior to it checking if it is
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not enabled/recording guest writes. The bitmap being busy was likely
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at the behest of the user, so this error has a greater chance of being
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understood by the user.
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Signed-off-by: John Snow <jsnow@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Message-id: 20190223000614.13894-6-jsnow@redhat.com
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Signed-off-by: John Snow <jsnow@redhat.com>
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(cherry picked from commit 3b78a92776bf1199b6864f2f38d9d341fb741f36)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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nbd/server.c | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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diff --git a/nbd/server.c b/nbd/server.c
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index 0910d09..de21c64 100644
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--- a/nbd/server.c
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+++ b/nbd/server.c
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@@ -1510,6 +1510,11 @@ NBDExport *nbd_export_new(BlockDriverState *bs, uint64_t dev_offset,
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goto fail;
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}
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+ if (bdrv_dirty_bitmap_user_locked(bm)) {
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+ error_setg(errp, "Bitmap '%s' is in use", bitmap);
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+ goto fail;
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+ }
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+
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if ((nbdflags & NBD_FLAG_READ_ONLY) && bdrv_is_writable(bs) &&
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bdrv_dirty_bitmap_enabled(bm)) {
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error_setg(errp,
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@@ -1518,11 +1523,6 @@ NBDExport *nbd_export_new(BlockDriverState *bs, uint64_t dev_offset,
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goto fail;
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}
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- if (bdrv_dirty_bitmap_user_locked(bm)) {
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- error_setg(errp, "Bitmap '%s' is in use", bitmap);
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- goto fail;
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- }
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-
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bdrv_dirty_bitmap_set_qmp_locked(bm, true);
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exp->export_bitmap = bm;
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exp->export_bitmap_context = g_strdup_printf("qemu:dirty-bitmap:%s",
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--
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1.8.3.1
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