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block: Pass bdrv_file_open() options to block drivers

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Specify -drive file.option=... on the command line to pass the option to
the protocol instead of the format driver.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2013-03-06 12:20:31 +01:00
parent 787e4a8500
commit 707ff8282b
1 changed files with 58 additions and 9 deletions
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67
block.c
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@ -676,7 +676,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
assert(drv != NULL);
assert(bs->file == NULL);
assert(options == NULL || bs->options != options);
assert(options != NULL && bs->options != options);
trace_bdrv_open_common(bs, filename, flags, drv->format_name);
@ -755,22 +755,48 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename,
BlockDriver *drv;
int ret;
QDECREF(options);
drv = bdrv_find_protocol(filename);
if (!drv) {
QDECREF(options);
return -ENOENT;
}
bs = bdrv_new("");
ret = bdrv_open_common(bs, NULL, filename, NULL, flags, drv);
if (ret < 0) {
bdrv_delete(bs);
return ret;
/* NULL means an empty set of options */
if (options == NULL) {
options = qdict_new();
}
bs = bdrv_new("");
bs->options = options;
options = qdict_clone_shallow(options);
ret = bdrv_open_common(bs, NULL, filename, options, flags, drv);
if (ret < 0) {
goto fail;
}
/* Check if any unknown options were used */
if (qdict_size(options) != 0) {
const QDictEntry *entry = qdict_first(options);
qerror_report(ERROR_CLASS_GENERIC_ERROR, "Block protocol '%s' doesn't "
"support the option '%s'",
drv->format_name, entry->key);
ret = -EINVAL;
goto fail;
}
QDECREF(options);
bs->growable = 1;
*pbs = bs;
return 0;
fail:
QDECREF(options);
if (!bs->drv) {
QDECREF(bs->options);
}
bdrv_delete(bs);
return ret;
}
int bdrv_open_backing_file(BlockDriverState *bs)
@ -810,6 +836,25 @@ int bdrv_open_backing_file(BlockDriverState *bs)
return 0;
}
static void extract_subqdict(QDict *src, QDict **dst, const char *start)
{
const QDictEntry *entry, *next;
const char *p;
*dst = qdict_new();
entry = qdict_first(src);
while (entry != NULL) {
next = qdict_next(src, entry);
if (strstart(entry->key, start, &p)) {
qobject_incref(entry->value);
qdict_put_obj(*dst, p, entry->value);
qdict_del(src, entry->key);
}
entry = next;
}
}
/*
* Opens a disk image (raw, qcow2, vmdk, ...)
*
@ -825,6 +870,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
/* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */
char tmp_filename[PATH_MAX + 1];
BlockDriverState *file = NULL;
QDict *file_options = NULL;
/* NULL means an empty set of options */
if (options == NULL) {
@ -896,7 +942,10 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
flags |= BDRV_O_ALLOW_RDWR;
}
ret = bdrv_file_open(&file, filename, NULL, bdrv_open_flags(bs, flags));
extract_subqdict(options, &file_options, "file.");
ret = bdrv_file_open(&file, filename, file_options,
bdrv_open_flags(bs, flags));
if (ret < 0) {
goto fail;
}