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block: Always pass driver name through options QDict

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The "driver" entry in the options QDict is now only missing if we're
opening an image with format probing.

We also catch cases now where both the drv argument and a "driver"
option is specified, e.g. by specifying -drive format=qcow2,driver=raw

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2014-05-27 10:50:29 +02:00
parent 5e5c4f63f4
commit 17b005f1d4
3 changed files with 45 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
block.c
View File

@ -1037,14 +1037,13 @@ static QDict *parse_json_filename(const char *filename, Error **errp)
* filename/flags pair to option QDict entries.
*/
static int bdrv_fill_options(QDict **options, const char **pfilename, int flags,
Error **errp)
BlockDriver *drv, Error **errp)
{
const char *filename = *pfilename;
const char *drvname;
bool protocol = flags & BDRV_O_PROTOCOL;
bool parse_filename = false;
Error *local_err = NULL;
BlockDriver *drv;
/* Parse json: pseudo-protocol */
if (filename && g_str_has_prefix(filename, "json:")) {
@ -1061,12 +1060,8 @@ static int bdrv_fill_options(QDict **options, const char **pfilename, int flags,
*pfilename = filename = NULL;
}
if (!protocol) {
return 0;
}
/* Fetch the file name from the options QDict if necessary */
if (filename) {
if (protocol && filename) {
if (!qdict_haskey(*options, "filename")) {
qdict_put(*options, "filename", qstring_from_str(filename));
parse_filename = true;
@ -1081,30 +1076,41 @@ static int bdrv_fill_options(QDict **options, const char **pfilename, int flags,
filename = qdict_get_try_str(*options, "filename");
drvname = qdict_get_try_str(*options, "driver");
if (!drvname) {
if (filename) {
drv = bdrv_find_protocol(filename, parse_filename);
if (!drv) {
error_setg(errp, "Unknown protocol");
if (drv) {
if (drvname) {
error_setg(errp, "Driver specified twice");
return -EINVAL;
}
drvname = drv->format_name;
qdict_put(*options, "driver", qstring_from_str(drvname));
} else {
if (!drvname && protocol) {
if (filename) {
drv = bdrv_find_protocol(filename, parse_filename);
if (!drv) {
error_setg(errp, "Unknown protocol");
return -EINVAL;
}
drvname = drv->format_name;
qdict_put(*options, "driver", qstring_from_str(drvname));
} else {
error_setg(errp, "Must specify either driver or file");
return -EINVAL;
}
drvname = drv->format_name;
qdict_put(*options, "driver", qstring_from_str(drvname));
} else {
error_setg(errp, "Must specify either driver or file");
return -EINVAL;
} else if (drvname) {
drv = bdrv_find_format(drvname);
if (!drv) {
error_setg(errp, "Unknown driver '%s'", drvname);
return -ENOENT;
}
}
}
drv = bdrv_find_format(drvname);
if (!drv) {
error_setg(errp, "Unknown driver '%s'", drvname);
return -ENOENT;
}
assert(drv || !protocol);
/* Driver-specific filename parsing */
if (drv->bdrv_parse_filename && parse_filename) {
if (drv && drv->bdrv_parse_filename && parse_filename) {
drv->bdrv_parse_filename(filename, *options, &local_err);
if (local_err) {
error_propagate(errp, local_err);
@ -1438,7 +1444,7 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
options = qdict_new();
}
ret = bdrv_fill_options(&options, &filename, flags, &local_err);
ret = bdrv_fill_options(&options, &filename, flags, drv, &local_err);
if (local_err) {
goto fail;
}
@ -1478,7 +1484,10 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
}
/* Find the right image format driver */
drv = NULL;
drvname = qdict_get_try_str(options, "driver");
assert(drvname || !(flags & BDRV_O_PROTOCOL));
if (drvname) {
drv = bdrv_find_format(drvname);
qdict_del(options, "driver");
@ -1487,19 +1496,14 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
ret = -EINVAL;
goto fail;
}
}
if (!drv) {
if (file) {
ret = find_image_format(file, filename, &drv, &local_err);
} else {
error_setg(errp, "Must specify either driver or file");
ret = -EINVAL;
} else if (file) {
ret = find_image_format(file, filename, &drv, &local_err);
if (ret < 0) {
goto fail;
}
}
if (!drv) {
} else {
error_setg(errp, "Must specify either driver or file");
ret = -EINVAL;
goto fail;
}

1
tests/qemu-iotests/051
View File

@ -92,6 +92,7 @@ echo
run_qemu -drive file="$TEST_IMG",format=foo
run_qemu -drive file="$TEST_IMG",driver=foo
run_qemu -drive file="$TEST_IMG",driver=raw,format=qcow2
echo
echo === Overriding backing file ===

5
tests/qemu-iotests/051.out
View File

@ -38,7 +38,10 @@ Testing: -drive file=TEST_DIR/t.qcow2,format=foo
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,format=foo: 'foo' invalid format
Testing: -drive file=TEST_DIR/t.qcow2,driver=foo
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=foo: could not open disk image TEST_DIR/t.qcow2: Invalid driver: 'foo'
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=foo: could not open disk image TEST_DIR/t.qcow2: Unknown driver 'foo'
Testing: -drive file=TEST_DIR/t.qcow2,driver=raw,format=qcow2
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=raw,format=qcow2: could not open disk image TEST_DIR/t.qcow2: Driver specified twice
=== Overriding backing file ===