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

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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
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6
blockdev.c
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@ -2420,6 +2420,8 @@ void qmp_block_commit(const char *job_id, const char *device,
const char *top_node,
const char *top,
const char *backing_file,
bool has_backing_mask_protocol,
bool backing_mask_protocol,
bool has_speed, int64_t speed,
bool has_on_error, BlockdevOnError on_error,
const char *filter_node_name,
@ -2450,6 +2452,9 @@ void qmp_block_commit(const char *job_id, const char *device,
if (has_auto_dismiss && !auto_dismiss) {
job_flags |= JOB_MANUAL_DISMISS;
}
if (!has_backing_mask_protocol) {
backing_mask_protocol = false;
}
/* Important Note:
* libvirt relies on the DeviceNotFound error class in order to probe for
@ -2591,6 +2596,7 @@ void qmp_block_commit(const char *job_id, const char *device,
}
commit_start(job_id, bs, base_bs, top_bs, job_flags,
speed, on_error, backing_file,
backing_mask_protocol,
filter_node_name, &local_err);
}
if (local_err != NULL) {