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util: storage: add JSON backing volume parser 'raw' block driver

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The 'raw' block driver in Qemu is not directly interesting from
libvirt's perspective, but it can be layered above some other block
drivers and this may be interesting for the user.

The patch adds support for the 'raw' block driver. The driver is treated
simply as a pass-through and child driver in JSON is queried to get the
necessary information.

Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>
This commit is contained in:
Tomáš Golembiovský 2017-02-13 23:53:43 +01:00 committed by Peter Krempa
parent cb4adb43d6
commit e4c6d4ae55
2 changed files with 22 additions and 0 deletions
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16
src/util/virstoragefile.c
View File

@ -2647,6 +2647,11 @@ virStorageSourceParseBackingColon(virStorageSourcePtr src,
}
static int
virStorageSourceParseBackingJSONInternal(virStorageSourcePtr src,
virJSONValuePtr json);
static int
virStorageSourceParseBackingJSONPath(virStorageSourcePtr src,
virJSONValuePtr json,
@ -2963,6 +2968,16 @@ virStorageSourceParseBackingJSONRBD(virStorageSourcePtr src,
return -1;
}
static int
virStorageSourceParseBackingJSONRaw(virStorageSourcePtr src,
virJSONValuePtr json,
int opaque ATTRIBUTE_UNUSED)
{
/* There are no interesting attributes in raw driver.
* Treat it as pass-through.
*/
return virStorageSourceParseBackingJSONInternal(src, json);
}
struct virStorageSourceJSONDriverParser {
const char *drvname;
@ -2985,6 +3000,7 @@ static const struct virStorageSourceJSONDriverParser jsonParsers[] = {
{"sheepdog", virStorageSourceParseBackingJSONSheepdog, 0},
{"ssh", virStorageSourceParseBackingJSONSSH, 0},
{"rbd", virStorageSourceParseBackingJSONRBD, 0},
{"raw", virStorageSourceParseBackingJSONRaw, 0},
};

6
tests/virstoragetest.c
View File

@ -1496,6 +1496,12 @@ mymain(void)
"<source protocol='rbd' name='testshare'>\n"
" <host name='example.com'/>\n"
"</source>\n");
TEST_BACKING_PARSE("json:{ \"file\": { "
"\"driver\": \"raw\","
"\"file\": {"
"\"driver\": \"file\","
"\"filename\": \"/path/to/file\" } } }",
"<source file='/path/to/file'/>\n");
cleanup:
/* Final cleanup */