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[PATCH 3/5] block/prl-xml: add bdrv_probe
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH 3/5] block/prl-xml: add bdrv_probe |
Date: |
Fri, 13 Nov 2020 15:58:46 +0300 |
From: Klim Kireev <klim.kireev@virtuozzo.com>
This commit adds bdrv_probe implementation.
It checks the filename (it must be DiskDescriptor.xml).
Then it checks correctness of the xml file using libxml2.
Signed-off-by: Klim Kireev <klim.kireev@virtuozzo.com>
---
block/prl-xml.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/block/prl-xml.c b/block/prl-xml.c
index 5ab32bb6ab..023651342c 100644
--- a/block/prl-xml.c
+++ b/block/prl-xml.c
@@ -467,6 +467,30 @@ fail:
return ret;
}
+static int prl_probe_xml(const uint8_t *data, int buf_size,
+ const char *filename)
+{
+ xmlDoc *doc = NULL;
+ xmlNodePtr root;
+
+ if (strcmp(basename(filename), PRL_XML_FILENAME) != 0) {
+ return 0;
+ }
+
+ doc = xmlReadFile(filename, NULL, XML_PARSE_NOERROR | XML_PARSE_NOWARNING);
+ if (doc == NULL) {
+ return 0;
+ }
+
+ root = xmlDocGetRootElement(doc);
+ if (root == NULL) {
+ return 0;
+ }
+
+ xmlFreeDoc(doc);
+ return 100;
+}
+
static coroutine_fn int
prl_co_readv(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
@@ -499,6 +523,7 @@ static coroutine_fn int prl_co_flush_to_os(BlockDriverState
*bs)
static BlockDriver bdrv_prl_xml = {
.format_name = "prl-xml",
.instance_size = sizeof(BDRVPrlXmlState),
+ .bdrv_probe = prl_probe_xml,
.bdrv_open = prl_open_xml,
.bdrv_co_readv = prl_co_readv,
.bdrv_co_writev = prl_co_writev,
--
2.21.3