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block: Keep "driver" in bs->options

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Instead of passing a separate drv argument to bdrv_open_common(), just
make sure that a "driver" option is set in the QDict. This also means
that a "driver" entry is consistently present in bs->options now.

This is another step towards keeping all options in the QDict (which is
the represenation of the blockdev-add QMP command).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2015-04-24 16:38:02 +02:00
parent 4cdd01d32e
commit 62392ebb09
1 changed files with 40 additions and 17 deletions
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57
block.c
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@ -817,6 +817,11 @@ static QemuOptsList bdrv_runtime_opts = {
.type = QEMU_OPT_STRING,
.help = "Node name of the block device node",
},
{
.name = "driver",
.type = QEMU_OPT_STRING,
.help = "Block driver to use for the node",
},
{ /* end of list */ }
},
};
@ -827,18 +832,31 @@ static QemuOptsList bdrv_runtime_opts = {
* Removes all processed options from *options.
*/
static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
QDict *options, int flags, BlockDriver *drv, Error **errp)
QDict *options, int flags, Error **errp)
{
int ret, open_flags;
const char *filename;
const char *driver_name = NULL;
const char *node_name = NULL;
QemuOpts *opts;
BlockDriver *drv;
Error *local_err = NULL;
assert(drv != NULL);
assert(bs->file == NULL);
assert(options != NULL && bs->options != options);
opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto fail_opts;
}
driver_name = qemu_opt_get(opts, "driver");
drv = bdrv_find_format(driver_name);
assert(drv != NULL);
if (file != NULL) {
filename = file->bs->filename;
} else {
@ -848,19 +866,12 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
if (drv->bdrv_needs_filename && !filename) {
error_setg(errp, "The '%s' block driver requires a file name",
drv->format_name);
return -EINVAL;
}
trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name);
opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto fail_opts;
}
trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name);
node_name = qemu_opt_get(opts, "node-name");
bdrv_assign_node_name(bs, node_name, &local_err);
if (local_err) {
@ -1477,11 +1488,14 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
goto fail;
}
bs->open_flags = flags;
bs->options = options;
options = qdict_clone_shallow(options);
/* Find the right image format driver */
drvname = qdict_get_try_str(options, "driver");
if (drvname) {
drv = bdrv_find_format(drvname);
qdict_del(options, "driver");
if (!drv) {
error_setg(errp, "Unknown driver: '%s'", drvname);
ret = -EINVAL;
@ -1497,10 +1511,6 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
qdict_del(options, "backing");
}
bs->open_flags = flags;
bs->options = options;
options = qdict_clone_shallow(options);
/* Open image file without format layer */
if ((flags & BDRV_O_PROTOCOL) == 0) {
if (flags & BDRV_O_RDWR) {
@ -1528,6 +1538,19 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
if (ret < 0) {
goto fail;
}
/*
* This option update would logically belong in bdrv_fill_options(),
* but we first need to open bs->file for the probing to work, while
* opening bs->file already requires the (mostly) final set of options
* so that cache mode etc. can be inherited.
*
* Adding the driver later is somewhat ugly, but it's not an option
* that would ever be inherited, so it's correct. We just need to make
* sure to update both bs->options (which has the full effective
* options for bs) and options (which has file.* already removed).
*/
qdict_put(bs->options, "driver", qstring_from_str(drv->format_name));
qdict_put(options, "driver", qstring_from_str(drv->format_name));
} else if (!drv) {
error_setg(errp, "Must specify either driver or file");
ret = -EINVAL;
@ -1541,7 +1564,7 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
assert(!(flags & BDRV_O_PROTOCOL) || !file);
/* Open the image */
ret = bdrv_open_common(bs, file, options, flags, drv, &local_err);
ret = bdrv_open_common(bs, file, options, flags, &local_err);
if (ret < 0) {
goto fail;
}