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block: Use CAFs in bdrv_refresh_filename() 

bdrv_refresh_filename() and the kind of related bdrv_dirname() should
look to the primary child when they wish to copy the underlying file's
filename.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2019-06-12 17:43:03 +02:00 committed by Kevin Wolf
parent 66b129ac5e
commit 52f72d6fb6
1 changed files with 21 additions and 8 deletions
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29
block.c
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@ -6822,6 +6822,7 @@ void bdrv_refresh_filename(BlockDriverState *bs)
{
BlockDriver *drv = bs->drv;
BdrvChild *child;
BlockDriverState *primary_child_bs;
QDict *opts;
bool backing_overridden;
bool generate_json_filename; /* Whether our default implementation should
@ -6891,20 +6892,30 @@ void bdrv_refresh_filename(BlockDriverState *bs)
qobject_unref(bs->full_open_options);
bs->full_open_options = opts;
primary_child_bs = bdrv_primary_bs(bs);
if (drv->bdrv_refresh_filename) {
/* Obsolete information is of no use here, so drop the old file name
* information before refreshing it */
bs->exact_filename[0] = '\0';
drv->bdrv_refresh_filename(bs);
} else if (bs->file) {
/* Try to reconstruct valid information from the underlying file */
} else if (primary_child_bs) {
/*
* Try to reconstruct valid information from the underlying
* file -- this only works for format nodes (filter nodes
* cannot be probed and as such must be selected by the user
* either through an options dict, or through a special
* filename which the filter driver must construct in its
* .bdrv_refresh_filename() implementation).
*/
bs->exact_filename[0] = '\0';
/*
* We can use the underlying file's filename if:
* - it has a filename,
* - the current BDS is not a filter,
* - the file is a protocol BDS, and
* - opening that file (as this BDS's format) will automatically create
* the BDS tree we have right now, that is:
@ -6913,11 +6924,11 @@ void bdrv_refresh_filename(BlockDriverState *bs)
* - no non-file child of this BDS has been overridden by the user
* Both of these conditions are represented by generate_json_filename.
*/
if (bs->file->bs->exact_filename[0] &&
bs->file->bs->drv->bdrv_file_open &&
!generate_json_filename)
if (primary_child_bs->exact_filename[0] &&
primary_child_bs->drv->bdrv_file_open &&
!drv->is_filter && !generate_json_filename)
{
strcpy(bs->exact_filename, bs->file->bs->exact_filename);
strcpy(bs->exact_filename, primary_child_bs->exact_filename);
}
}
@ -6937,6 +6948,7 @@ void bdrv_refresh_filename(BlockDriverState *bs)
char *bdrv_dirname(BlockDriverState *bs, Error **errp)
{
BlockDriver *drv = bs->drv;
BlockDriverState *child_bs;
if (!drv) {
error_setg(errp, "Node '%s' is ejected", bs->node_name);
@ -6947,8 +6959,9 @@ char *bdrv_dirname(BlockDriverState *bs, Error **errp)
return drv->bdrv_dirname(bs, errp);
}
if (bs->file) {
return bdrv_dirname(bs->file->bs, errp);
child_bs = bdrv_primary_bs(bs);
if (child_bs) {
return bdrv_dirname(child_bs, errp);
}
bdrv_refresh_filename(bs);