motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 15:23:53 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

commit: Allow users to request only format driver names in backing file format

Browse source 
Introduce a new flag 'backing-mask-protocol' for the block-commit QMP
command which instructs the internals to use 'raw' instead of the
protocol driver in case when a image is used without a dummy 'raw'
wrapper.

The flag is designed such that it can be always asserted by management
tools even when there isn't any update to backing files.

The flag will be used by libvirt so that the backing images still
reference the proper format even when libvirt will stop using the dummy
raw driver (raw driver with no other config). Libvirt needs this so that
the images stay compatible with older libvirt versions which didn't
expect that a protocol driver name can appear in the backing file format
field.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-ID: <2cb46e37093ce793ea1604abc8bbb90f4c8e434b.1701796348.git.pkrempa@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Krempa 2023-12-05 18:14:41 +01:00 • committed by Kevin Wolf
parent 014b99a8e4
commit 4b028cbe75
8 changed files with 58 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

6
block/commit.c
View file

@ -42,6 +42,7 @@ typedef struct CommitBlockJob {
bool base_read_only;
bool chain_frozen;
char *backing_file_str;
bool backing_mask_protocol;
} CommitBlockJob;
static int commit_prepare(Job *job)
@ -61,7 +62,8 @@ static int commit_prepare(Job *job)
/* FIXME: bdrv_drop_intermediate treats total failures and partial failures
* identically. Further work is needed to disambiguate these cases. */
return bdrv_drop_intermediate(s->commit_top_bs, s->base_bs,
s->backing_file_str);
s->backing_file_str,
s->backing_mask_protocol);
}
static void commit_abort(Job *job)
@ -254,6 +256,7 @@ void commit_start(const char *job_id, BlockDriverState *bs,
BlockDriverState *base, BlockDriverState *top,
int creation_flags, int64_t speed,
BlockdevOnError on_error, const char *backing_file_str,
bool backing_mask_protocol,
const char *filter_node_name, Error **errp)
{
CommitBlockJob *s;
@ -408,6 +411,7 @@ void commit_start(const char *job_id, BlockDriverState *bs,
blk_set_disable_request_queuing(s->top, true);
s->backing_file_str = g_strdup(backing_file_str);
s->backing_mask_protocol = backing_mask_protocol;
s->on_error = on_error;
trace_commit_start(bs, base, top, s);