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block: enable cache mode of empty cdrom

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enable cache mode even if cdrom is empty

Signed-off-by: wangjian161 <wangjian161@huawei.com>
This commit is contained in:
Chen Qun 2022-02-09 11:18:21 +08:00 committed by yezengruan
parent 95206472cc
commit 05acb1318d
1 changed files with 49 additions and 0 deletions
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49
block-enable-cache-mode-of-empty-cdrom.patch Normal file
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@ -0,0 +1,49 @@
From 21b172a3ce13c3b499e4265628f7d7c7e1189749 Mon Sep 17 00:00:00 2001
From: WangJian <wangjian161@huawei.com>
Date: Wed, 9 Feb 2022 11:18:21 +0800
Subject: [PATCH] block: enable cache mode of empty cdrom
enable cache mode even if cdrom is empty
Signed-off-by: wangjian161 <wangjian161@huawei.com>
---
blockdev.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/blockdev.c b/blockdev.c
index 10a73fa423..37e3ee6f26 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -492,6 +492,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
QDict *interval_dict = NULL;
QList *interval_list = NULL;
const char *id;
+ const char *cache;
BlockdevDetectZeroesOptions detect_zeroes =
BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
const char *throttling_group = NULL;
@@ -583,6 +584,21 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
+ if (!file || !*file) {
+ cache = qdict_get_try_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH);
+ if (cache && !strcmp(cache, "on")) {
+ bdrv_flags |= BDRV_O_NO_FLUSH;
+ }
+
+ cache = qdict_get_try_str(bs_opts, BDRV_OPT_CACHE_DIRECT);
+ if (cache && !strcmp(cache, "on")) {
+ bdrv_flags |= BDRV_O_NOCACHE;
+ }
+
+ qdict_del(bs_opts, BDRV_OPT_CACHE_NO_FLUSH);
+ qdict_del(bs_opts, BDRV_OPT_CACHE_DIRECT);
+ }
+
/* init */
if ((!file || !*file) && !qdict_size(bs_opts)) {
BlockBackendRootState *blk_rs;
--
2.27.0