| Message ID | 1602524605-481160-11-git-send-email-andrey.shinkevich@virtuozzo.com |
|---|---|
| State | New |
| Headers | show |
| Series | Apply COR-filter to the block-stream permanently | expand |
14.10.2020 18:02, Max Reitz wrote: > On 12.10.20 19:43, Andrey Shinkevich wrote: >> Avoid writing a filter JSON-name to QCOW2 image when the backing file >> is changed after the block stream job. >> >> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> >> --- >> block/stream.c | 9 +++++---- >> 1 file changed, 5 insertions(+), 4 deletions(-) >> >> diff --git a/block/stream.c b/block/stream.c >> index e0540ee..51462bd 100644 >> --- a/block/stream.c >> +++ b/block/stream.c >> @@ -65,6 +65,7 @@ static int stream_prepare(Job *job) >> BlockDriverState *bs = blk_bs(bjob->blk); >> BlockDriverState *unfiltered_bs = bdrv_skip_filters(bs); >> BlockDriverState *base = bdrv_filter_or_cow_bs(s->above_base); >> + BlockDriverState *base_unfiltered = bdrv_skip_filters(base); >> Error *local_err = NULL; >> int ret = 0; >> >> @@ -73,10 +74,10 @@ static int stream_prepare(Job *job) >> >> if (bdrv_cow_child(unfiltered_bs)) { >> const char *base_id = NULL, *base_fmt = NULL; >> - if (base) { >> - base_id = s->backing_file_str; >> - if (base->drv) { >> - base_fmt = base->drv->format_name; >> + if (base_unfiltered) { >> + base_id = base_unfiltered->filename; > > I think you have to leave this querying s->backing_file_str, and instead > change how qmp_block_stream() gets @base_name. block-stream has a > backing-file parameter that can override the string that should be used > here. > > (Or perhaps you can let qmp_block_stream() just set it to NULL if no > backing-file parameter is passed and then fall back to > base_unfiltered->filename only here. Probably better, actually, in case > base_unfiltered is changed during the job run.) > Agree with the way in brackets. If user set backing-file parameter we should handle it here. If backing-file is not set, we should use dynamically calculated unfiltered base in stream_prepare().
diff --git a/block/stream.c b/block/stream.c index e0540ee..51462bd 100644 --- a/block/stream.c +++ b/block/stream.c @@ -65,6 +65,7 @@ static int stream_prepare(Job *job) BlockDriverState *bs = blk_bs(bjob->blk); BlockDriverState *unfiltered_bs = bdrv_skip_filters(bs); BlockDriverState *base = bdrv_filter_or_cow_bs(s->above_base); + BlockDriverState *base_unfiltered = bdrv_skip_filters(base); Error *local_err = NULL; int ret = 0; @@ -73,10 +74,10 @@ static int stream_prepare(Job *job) if (bdrv_cow_child(unfiltered_bs)) { const char *base_id = NULL, *base_fmt = NULL; - if (base) { - base_id = s->backing_file_str; - if (base->drv) { - base_fmt = base->drv->format_name; + if (base_unfiltered) { + base_id = base_unfiltered->filename; + if (base_unfiltered->drv) { + base_fmt = base_unfiltered->drv->format_name; } } bdrv_set_backing_hd(unfiltered_bs, base, &local_err);
Avoid writing a filter JSON-name to QCOW2 image when the backing file is changed after the block stream job. Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> --- block/stream.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)