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blockdev: 'blockdev-add' QMP command
For examples see the changes to qmp-commands.hx. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf
parent
2d246f01d3
commit
d26c9a1573
57
blockdev.c
57
blockdev.c
@ -38,6 +38,8 @@
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#include "qemu/option.h"
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#include "qemu/config-file.h"
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#include "qapi/qmp/types.h"
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#include "qapi-visit.h"
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#include "qapi/qmp-output-visitor.h"
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#include "sysemu/sysemu.h"
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#include "block/block_int.h"
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#include "qmp-commands.h"
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@ -2066,6 +2068,61 @@ void qmp_block_job_complete(const char *device, Error **errp)
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block_job_complete(job, errp);
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}
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void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
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{
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QmpOutputVisitor *ov = qmp_output_visitor_new();
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QObject *obj;
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QDict *qdict;
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DriveInfo *dinfo;
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Error *local_err = NULL;
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/* Require an ID in the top level */
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if (!options->has_id) {
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error_setg(errp, "Block device needs an ID");
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goto fail;
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}
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/* TODO Sort it out in raw-posix and drive_init: Reject aio=native with
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* cache.direct=false instead of silently switching to aio=threads, except
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* if called from drive_init.
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*
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* For now, simply forbidding the combination for all drivers will do. */
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if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
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bool direct = options->cache->has_direct && options->cache->direct;
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if (!options->has_cache && !direct) {
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error_setg(errp, "aio=native requires cache.direct=true");
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goto fail;
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}
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}
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visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
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&options, NULL, &local_err);
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if (error_is_set(&local_err)) {
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error_propagate(errp, local_err);
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goto fail;
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}
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obj = qmp_output_get_qobject(ov);
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qdict = qobject_to_qdict(obj);
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qdict_flatten(qdict);
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QemuOpts *opts = qemu_opts_from_qdict(&qemu_drive_opts, qdict, &local_err);
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if (error_is_set(&local_err)) {
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error_propagate(errp, local_err);
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goto fail;
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}
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dinfo = blockdev_init(opts, IF_NONE);
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if (!dinfo) {
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error_setg(errp, "Could not open image");
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goto fail;
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}
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fail:
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qmp_output_visitor_cleanup(ov);
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}
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static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
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{
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BlockJobInfoList **prev = opaque;
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236
qapi-schema.json
236
qapi-schema.json
@ -3952,3 +3952,239 @@
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##
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{ 'command': 'query-rx-filter', 'data': { '*name': 'str' },
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'returns': ['RxFilterInfo'] }
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##
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# @BlockdevDiscardOptions
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#
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# Determines how to handle discard requests.
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#
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# @ignore: Ignore the request
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# @unmap: Forward as an unmap request
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#
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# Since: 1.7
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##
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{ 'enum': 'BlockdevDiscardOptions',
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'data': [ 'ignore', 'unmap' ] }
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##
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# @BlockdevAioOptions
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#
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# Selects the AIO backend to handle I/O requests
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#
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# @threads: Use qemu's thread pool
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# @native: Use native AIO backend (only Linux and Windows)
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#
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# Since: 1.7
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##
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{ 'enum': 'BlockdevAioOptions',
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'data': [ 'threads', 'native' ] }
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##
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# @BlockdevCacheOptions
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#
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# Includes cache-related options for block devices
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#
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# @writeback: #optional enables writeback mode for any caches (default: true)
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# @direct: #optional enables use of O_DIRECT (bypass the host page cache;
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# default: false)
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# @no-flush: #optional ignore any flush requests for the device (default:
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# false)
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#
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# Since: 1.7
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##
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{ 'type': 'BlockdevCacheOptions',
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'data': { '*writeback': 'bool',
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'*direct': 'bool',
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'*no-flush': 'bool' } }
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##
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# @BlockdevOptionsBase
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#
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# Options that are available for all block devices, independent of the block
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# driver.
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#
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# @driver: block driver name
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# @id: #optional id by which the new block device can be referred to.
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# This is a required option on the top level of blockdev-add, and
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# currently not allowed on any other level.
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# @discard: #optional discard-related options (default: ignore)
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# @cache: #optional cache-related options
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# @aio: #optional AIO backend (default: threads)
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# @rerror: #optional how to handle read errors on the device
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# (default: report)
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# @werror: #optional how to handle write errors on the device
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# (default: enospc)
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# @read-only: #optional whether the block device should be read-only
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# (default: false)
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#
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# Since: 1.7
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##
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{ 'type': 'BlockdevOptionsBase',
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'data': { 'driver': 'str',
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'*id': 'str',
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'*discard': 'BlockdevDiscardOptions',
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'*cache': 'BlockdevCacheOptions',
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'*aio': 'BlockdevAioOptions',
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'*rerror': 'BlockdevOnError',
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'*werror': 'BlockdevOnError',
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'*read-only': 'bool' } }
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##
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# @BlockdevOptionsFile
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#
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# Driver specific block device options for the file backend and similar
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# protocols.
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#
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# @filename: path to the image file
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#
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# Since: 1.7
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##
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{ 'type': 'BlockdevOptionsFile',
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'data': { 'filename': 'str' } }
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##
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# @BlockdevOptionsVVFAT
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#
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# Driver specific block device options for the vvfat protocol.
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#
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# @dir: directory to be exported as FAT image
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# @fat-type: #optional FAT type: 12, 16 or 32
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# @floppy: #optional whether to export a floppy image (true) or
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# partitioned hard disk (false; default)
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# @rw: #optional whether to allow write operations (default: false)
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#
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# Since: 1.7
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##
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{ 'type': 'BlockdevOptionsVVFAT',
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'data': { 'dir': 'str', '*fat-type': 'int', '*floppy': 'bool',
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'*rw': 'bool' } }
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##
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# @BlockdevOptionsGenericFormat
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#
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# Driver specific block device options for image format that have no option
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# besides their data source.
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#
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# @file: reference to or definition of the data source block device
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#
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# Since: 1.7
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##
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{ 'type': 'BlockdevOptionsGenericFormat',
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'data': { 'file': 'BlockdevRef' } }
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##
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# @BlockdevOptionsGenericCOWFormat
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#
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# Driver specific block device options for image format that have no option
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# besides their data source and an optional backing file.
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#
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# @backing: #optional reference to or definition of the backing file block
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# device (if missing, taken from the image file content). It is
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# allowed to pass an empty string here in order to disable the
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# default backing file.
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#
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# Since: 1.7
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##
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{ 'type': 'BlockdevOptionsGenericCOWFormat',
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'base': 'BlockdevOptionsGenericFormat',
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'data': { '*backing': 'BlockdevRef' } }
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##
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# @BlockdevOptionsQcow2
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#
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# Driver specific block device options for qcow2.
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#
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# @lazy-refcounts: #optional whether to enable the lazy refcounts
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# feature (default is taken from the image file)
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#
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# @pass-discard-request: #optional whether discard requests to the qcow2
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# device should be forwarded to the data source
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#
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# @pass-discard-snapshot: #optional whether discard requests for the data source
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# should be issued when a snapshot operation (e.g.
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# deleting a snapshot) frees clusters in the qcow2 file
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#
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# @pass-discard-other: #optional whether discard requests for the data source
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# should be issued on other occasions where a cluster
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# gets freed
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#
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# Since: 1.7
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##
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{ 'type': 'BlockdevOptionsQcow2',
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'base': 'BlockdevOptionsGenericCOWFormat',
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'data': { '*lazy-refcounts': 'bool',
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'*pass-discard-request': 'bool',
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'*pass-discard-snapshot': 'bool',
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'*pass-discard-other': 'bool' } }
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##
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# @BlockdevOptions
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#
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# Options for creating a block device.
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#
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# Since: 1.7
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##
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{ 'union': 'BlockdevOptions',
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'base': 'BlockdevOptionsBase',
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'discriminator': 'driver',
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'data': {
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'file': 'BlockdevOptionsFile',
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'http': 'BlockdevOptionsFile',
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'https': 'BlockdevOptionsFile',
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'ftp': 'BlockdevOptionsFile',
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'ftps': 'BlockdevOptionsFile',
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'tftp': 'BlockdevOptionsFile',
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# TODO gluster: Wait for structured options
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# TODO iscsi: Wait for structured options
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# TODO nbd: Should take InetSocketAddress for 'host'?
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# TODO rbd: Wait for structured options
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# TODO sheepdog: Wait for structured options
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# TODO ssh: Should take InetSocketAddress for 'host'?
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'vvfat': 'BlockdevOptionsVVFAT',
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# TODO blkdebug: Wait for structured options
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# TODO blkverify: Wait for structured options
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'bochs': 'BlockdevOptionsGenericFormat',
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'cloop': 'BlockdevOptionsGenericFormat',
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'cow': 'BlockdevOptionsGenericCOWFormat',
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'dmg': 'BlockdevOptionsGenericFormat',
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'parallels': 'BlockdevOptionsGenericFormat',
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'qcow': 'BlockdevOptionsGenericCOWFormat',
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'qcow2': 'BlockdevOptionsQcow2',
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'qed': 'BlockdevOptionsGenericCOWFormat',
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'raw': 'BlockdevOptionsGenericFormat',
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'vdi': 'BlockdevOptionsGenericFormat',
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'vhdx': 'BlockdevOptionsGenericFormat',
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'vmdk': 'BlockdevOptionsGenericCOWFormat',
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'vpc': 'BlockdevOptionsGenericFormat'
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} }
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##
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# @BlockdevRef
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#
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# Reference to a block device.
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#
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# @definition: defines a new block device inline
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# @reference: references the ID of an existing block device. An
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# empty string means that no block device should be
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# referenced.
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#
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# Since: 1.7
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##
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{ 'union': 'BlockdevRef',
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'discriminator': {},
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'data': { 'definition': 'BlockdevOptions',
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'reference': 'str' } }
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##
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# @blockdev-add:
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#
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# Creates a new block device.
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#
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# @options: block device options for the new device
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#
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# Since: 1.7
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##
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{ 'command': 'blockdev-add', 'data': { 'options': 'BlockdevOptions' } }
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@ -3239,4 +3239,59 @@ Example:
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]
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}
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EQMP
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{
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.name = "blockdev-add",
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.args_type = "options:q",
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.mhandler.cmd_new = qmp_marshal_input_blockdev_add,
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},
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SQMP
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blockdev-add
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------------
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Add a block device.
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Arguments:
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- "options": block driver options
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Example (1):
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-> { "execute": "blockdev-add",
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"arguments": { "options" : { "driver": "qcow2",
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"file": { "driver": "file",
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"filename": "test.qcow2" } } } }
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<- { "return": {} }
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Example (2):
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-> { "execute": "blockdev-add",
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"arguments": {
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"options": {
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"driver": "qcow2",
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"id": "my_disk",
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"discard": "unmap",
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"cache": {
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"direct": true,
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"writeback": true
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},
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"file": {
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"driver": "file",
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"filename": "/tmp/test.qcow2"
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},
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"backing": {
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"driver": "raw",
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"file": {
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"driver": "file",
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"filename": "/dev/fdset/4"
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}
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}
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}
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}
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}
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<- { "return": {} }
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EQMP
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