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block: Pass parent_is_format to .inherit_options()
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We plan to unify the generic .inherit_options() functions.  The
resulting common function will need to decide whether to force-enable
format probing, force-disable it, or leave it as-is.  To make this
decision, it will need to know whether the parent node is a format node
or not (because we never want format probing if the parent is a format
node already (except for the backing chain)).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200513110544.176672-9-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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@XanClic @kevmw
XanClic authored and kevmw committed May 18, 2020
1 parent 272c02e commit 3cdc69d
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Showing 4 changed files with 30 additions and 13 deletions.
37 changes: 27 additions & 10 deletions block.c
View file
Expand Up @@ -1154,7 +1154,7 @@ static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options,
* Returns the options and flags that bs->file should get if a protocol driver
* is expected, based on the given options and flags for the parent BDS
*/
static void bdrv_inherited_options(BdrvChildRole role,
static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options)
{
Expand Down Expand Up @@ -1205,10 +1205,12 @@ const BdrvChildClass child_file = {
* flags for the parent BDS
*/
static void bdrv_inherited_fmt_options(BdrvChildRole role,
bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options)
{
child_file.inherit_options(role, child_flags, child_options,
child_file.inherit_options(role, parent_is_format,
child_flags, child_options,
parent_flags, parent_options);

*child_flags &= ~(BDRV_O_PROTOCOL | BDRV_O_NO_IO);
Expand Down Expand Up @@ -1289,7 +1291,7 @@ static void bdrv_backing_detach(BdrvChild *c)
* Returns the options and flags that bs->backing should get, based on the
* given options and flags for the parent BDS
*/
static void bdrv_backing_options(BdrvChildRole role,
static void bdrv_backing_options(BdrvChildRole role, bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options)
{
Expand Down Expand Up @@ -3173,8 +3175,22 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
bs->explicit_options = qdict_clone_shallow(options);

if (child_class) {
bool parent_is_format;

if (parent->drv) {
parent_is_format = parent->drv->is_format;
} else {
/*
* parent->drv is not set yet because this node is opened for
* (potential) format probing. That means that @parent is going
* to be a format node.
*/
parent_is_format = true;
}

bs->inherits_from = parent;
child_class->inherit_options(child_role, &flags, options,
child_class->inherit_options(child_role, parent_is_format,
&flags, options,
parent->open_flags, parent->options);
}

Expand Down Expand Up @@ -3203,7 +3219,7 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
flags, options);
/* Let bdrv_backing_options() override "read-only" */
qdict_del(options, BDRV_OPT_READ_ONLY);
bdrv_backing_options(0, &flags, options, flags, options);
bdrv_backing_options(0, true, &flags, options, flags, options);
}

bs->open_flags = flags;
Expand Down Expand Up @@ -3488,6 +3504,7 @@ static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue,
QDict *options,
const BdrvChildClass *klass,
BdrvChildRole role,
bool parent_is_format,
QDict *parent_options,
int parent_flags,
bool keep_old_opts)
Expand Down Expand Up @@ -3543,7 +3560,7 @@ static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue,
/* Inherit from parent node */
if (parent_options) {
flags = 0;
klass->inherit_options(role, &flags, options,
klass->inherit_options(role, parent_is_format, &flags, options,
parent_flags, parent_options);
} else {
flags = bdrv_get_flags(bs);
Expand Down Expand Up @@ -3635,8 +3652,8 @@ static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue,
}

bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options,
child->klass, child->role, options, flags,
child_keep_old);
child->klass, child->role, bs->drv->is_format,
options, flags, child_keep_old);
}

return bs_queue;
Expand All @@ -3646,8 +3663,8 @@ BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
BlockDriverState *bs,
QDict *options, bool keep_old_opts)
{
return bdrv_reopen_queue_child(bs_queue, bs, options, NULL, 0, NULL, 0,
keep_old_opts);
return bdrv_reopen_queue_child(bs_queue, bs, options, NULL, 0, false,
NULL, 0, keep_old_opts);
}

/*
Expand Down
2 changes: 1 addition & 1 deletion block/block-backend.c
View file
Expand Up @@ -120,7 +120,7 @@ static QTAILQ_HEAD(, BlockBackend) block_backends =
static QTAILQ_HEAD(, BlockBackend) monitor_block_backends =
QTAILQ_HEAD_INITIALIZER(monitor_block_backends);

static void blk_root_inherit_options(BdrvChildRole role,
static void blk_root_inherit_options(BdrvChildRole role, bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options)
{
Expand Down
2 changes: 1 addition & 1 deletion block/vvfat.c
View file
Expand Up @@ -3128,7 +3128,7 @@ static BlockDriver vvfat_write_target = {
.bdrv_co_pwritev = write_target_commit,
};

static void vvfat_qcow_options(BdrvChildRole role,
static void vvfat_qcow_options(BdrvChildRole role, bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options)
{
Expand Down
2 changes: 1 addition & 1 deletion include/block/block_int.h
View file
Expand Up @@ -677,7 +677,7 @@ struct BdrvChildClass {
* non-BDS parents. */
bool parent_is_bds;

void (*inherit_options)(BdrvChildRole role,
void (*inherit_options)(BdrvChildRole role, bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options);

Expand Down

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