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Vladimir Sementsov-Ogievskiy 0fd05c8d80 qapi: blockdev-backup: add discard-source parameter 
Add a parameter that enables discard-after-copy. That is mostly useful
in "push backup with fleecing" scheme, when source is snapshot-access
format driver node, based on copy-before-write filter snapshot-access
API:

[guest]      [snapshot-access] ~~ blockdev-backup ~~> [backup target]
   |            |
   | root       | file
   v            v
[copy-before-write]
   |             |
   | file        | target
   v             v
[active disk]   [temp.img]

In this case discard-after-copy does two things:

 - discard data in temp.img to save disk space
 - avoid further copy-before-write operation in discarded area

Note that we have to declare WRITE permission on source in
copy-before-write filter, for discard to work. Still we can't take it
unconditionally, as it will break normal backup from RO source. So, we
have to add a parameter and pass it thorough bdrv_open flags.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Fiona Ebner <f.ebner@proxmox.com>
Tested-by: Fiona Ebner <f.ebner@proxmox.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20240313152822.626493-5-vsementsov@yandex-team.ru>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2024-05-28 15:52:15 +03:00
..
acpi.json qapi: Require descriptions and tagged sections to be indented 2024-02-26 10:43:56 +01:00
audio.json audio/pw: Pipewire->PipeWire case fix for user-visible text 2023-07-17 15:22:56 +04:00
authz.json qapi: Reformat doc comments to conform to current conventions 2023-05-10 10:01:01 +02:00
block-core.json qapi: blockdev-backup: add discard-source parameter 2024-05-28 15:52:15 +03:00
block-export.json qapi: Move error documentation to new "Errors" sections 2024-03-04 07:12:40 +01:00
block.json qapi: Refill doc comments to conform to current conventions 2024-03-26 06:36:08 +01:00
char.json qapi: Delete useless "Returns" sections 2024-03-04 07:12:40 +01:00
common.json qapi: document PCIe Gen5/Gen6 speeds since 9.0 2024-03-18 04:57:45 -04:00
compat.json qapi: Belatedly update CompatPolicy documentation for unstable 2023-10-19 07:02:29 +02:00
control.json qapi: Drop stray Arguments: line from qmp_capabilities docs 2024-03-26 06:36:08 +01:00
crypto.json qapi: Correct documentation indentation and whitespace 2024-03-26 06:36:08 +01:00
cryptodev.json spelling: information 2023-06-09 23:38:16 +03:00
cxl.json qapi: Refill doc comments to conform to current conventions 2024-03-26 06:36:08 +01:00
dump.json qapi: Correct documentation indentation and whitespace 2024-03-26 06:36:08 +01:00
ebpf.json qapi: Refill doc comments to conform to current conventions 2024-03-26 06:36:08 +01:00
error.json qapi: Reformat doc comments to conform to current conventions 2023-05-10 10:01:01 +02:00
introspect.json qapi: Drop redundant documentation of inherited members 2024-02-03 09:19:25 +01:00
job.json blockjob: introduce block-job-change QMP command 2023-10-31 18:20:25 +01:00
machine-common.json CPU topology: extend with s390 specifics 2023-10-20 07:16:53 +02:00
machine-target.json target/s390x: report deprecated-props in cpu-model-expansion reply 2024-05-10 08:34:20 +02:00
machine.json hw/core: Introduce module-id as the topology subindex 2024-04-25 12:48:12 +02:00
meson.build qapi/vfio: Add VFIO migration QAPI event 2024-05-16 16:59:19 +02:00
migration.json migration: Remove non-multifd compression 2024-05-08 09:20:59 -03:00
misc-target.json qapi: Delete useless "Returns" sections 2024-03-04 07:12:40 +01:00
misc.json qapi: Correct documentation indentation and whitespace 2024-03-26 06:36:08 +01:00
net.json qapi: Refill doc comments to conform to current conventions 2024-03-26 06:36:08 +01:00
opts-visitor.c qapi: Inline and remove QERR_INVALID_PARAMETER definition 2024-04-24 09:50:58 +02:00
pci.json qapi: Require descriptions and tagged sections to be indented 2024-02-26 10:43:56 +01:00
pragma.json qapi: document parameters of query-cpu-model-* QAPI commands 2024-03-26 06:36:08 +01:00
qapi-clone-visitor.c qapi: Make visitor functions taking Error ** return bool, not void 2020-07-10 15:18:08 +02:00
qapi-dealloc-visitor.c qapi: Make visitor functions taking Error ** return bool, not void 2020-07-10 15:18:08 +02:00
qapi-forward-visitor.c qapi: remove needless include 2022-03-22 14:46:18 +04:00
qapi-schema.json qapi/vfio: Add VFIO migration QAPI event 2024-05-16 16:59:19 +02:00
qapi-type-helpers.c qapi: New strv_from_str_list() 2024-03-04 07:12:40 +01:00
qapi-util.c qapi: Fix dangling references to docs/devel/qapi-code-gen.txt 2024-01-26 07:04:53 +01:00
qapi-visit-core.c qapi: Factor out compat_policy_input_ok() 2021-10-29 21:27:20 +02:00
qdev.json qapi: Delete useless "Returns" sections 2024-03-04 07:12:40 +01:00
qmp-dispatch.c monitor: use aio_co_reschedule_self() 2024-02-07 14:44:21 +01:00
qmp-event.c Replace qemu_gettimeofday() with g_get_real_time() 2022-04-06 10:50:37 +02:00
qmp-registry.c qapi: Generalize command policy checking 2021-10-29 18:24:46 +02:00
qobject-input-visitor.c qapi: Inline QERR_INVALID_PARAMETER_TYPE definition (constant value) 2024-04-24 09:50:58 +02:00
qobject-output-visitor.c qapi: Extend -compat to set policy for unstable interfaces 2021-10-29 21:28:01 +02:00
qom.json i386/sev: Add 'legacy-vm-type' parameter for SEV guest objects 2024-04-23 17:35:25 +02:00
replay.json qapi: Expand a few awkward abbreviations in documentation 2024-03-26 06:36:08 +01:00
rocker.json qapi: Require descriptions and tagged sections to be indented 2024-02-26 10:43:56 +01:00
run-state.json qapi: document leftover members in qapi/run-state.json 2024-03-26 06:36:08 +01:00
sockets.json qapi: Correct documentation indentation and whitespace 2024-03-26 06:36:08 +01:00
stats.json qapi: document leftover members in qapi/stats.json 2024-03-26 06:36:08 +01:00
string-input-visitor.c qapi: Inline QERR_INVALID_PARAMETER_TYPE definition (constant value) 2024-04-24 09:50:58 +02:00
string-output-visitor.c string-output-visitor: Fix (pseudo) struct handling 2024-01-26 11:16:58 +01:00
tpm.json qapi: Delete useless "Returns" sections 2024-03-04 07:12:40 +01:00
trace-events qapi: Generalize struct member policy checking 2021-10-29 18:23:09 +02:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
trace.json qapi: Require descriptions and tagged sections to be indented 2024-02-26 10:43:56 +01:00
transaction.json qapi: Delete useless "Returns" sections 2024-03-04 07:12:40 +01:00
ui.json qapi: document InputMultiTouchType 2024-03-26 06:36:08 +01:00
vfio.json qapi/vfio: Add VFIO migration QAPI event 2024-05-16 16:59:19 +02:00
virtio.json qapi: Refill doc comments to conform to current conventions 2024-03-26 06:36:08 +01:00
yank.json qapi/yank: Tweak @yank's error description for consistency 2024-03-04 07:12:40 +01:00