mirror of
https://github.com/xemu-project/xemu.git
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1c14eaabdb
The new block driver simply utilizes snapshot-access API of underlying block node. In further patches we want to use it like this: [guest] [NBD export] | | | root | root v file v [copy-before-write]<------[snapshot-access] | | | file | target v v [active-disk] [temp.img] This way, NBD client will be able to read snapshotted state of active disk, when active disk is continued to be written by guest. This is known as "fleecing", and currently uses another scheme based on qcow2 temporary image which backing file is active-disk. New scheme comes with benefits - see next commit. The other possible application is exporting internal snapshots of qcow2, like this: [guest] [NBD export] | | | root | root v file v [qcow2]<---------[snapshot-access] For this, we'll need to implement snapshot-access API handlers in qcow2 driver, and improve snapshot-access block driver (and API) to make it possible to select snapshot by name. Another thing to improve is size of snapshot. Now for simplicity we just use size of bs->file, which is OK for backup, but for qcow2 snapshots export we'll need to imporve snapshot-access API to get size of snapshot. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20220303194349.2304213-12-vsementsov@virtuozzo.com> [hreitz: Rebased on block GS/IO split] Signed-off-by: Hanna Reitz <hreitz@redhat.com>
152 lines
3.9 KiB
Meson
152 lines
3.9 KiB
Meson
block_ss.add(genh)
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block_ss.add(files(
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'accounting.c',
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'aio_task.c',
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'amend.c',
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'backup.c',
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'copy-before-write.c',
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'blkdebug.c',
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'blklogwrites.c',
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'blkverify.c',
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'block-backend.c',
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'block-copy.c',
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'commit.c',
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'copy-on-read.c',
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'preallocate.c',
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'progress_meter.c',
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'create.c',
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'crypto.c',
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'dirty-bitmap.c',
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'filter-compress.c',
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'io.c',
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'mirror.c',
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'nbd.c',
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'null.c',
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'qapi.c',
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'qcow2-bitmap.c',
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'qcow2-cache.c',
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'qcow2-cluster.c',
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'qcow2-refcount.c',
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'qcow2-snapshot.c',
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'qcow2-threads.c',
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'qcow2.c',
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'quorum.c',
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'raw-format.c',
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'reqlist.c',
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'snapshot.c',
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'snapshot-access.c',
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'throttle-groups.c',
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'throttle.c',
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'vhdx-endian.c',
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'vhdx-log.c',
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'vhdx.c',
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'vmdk.c',
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'vpc.c',
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'write-threshold.c',
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), zstd, zlib, gnutls)
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softmmu_ss.add(when: 'CONFIG_TCG', if_true: files('blkreplay.c'))
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if get_option('qcow1').allowed()
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block_ss.add(files('qcow.c'))
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endif
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if get_option('vdi').allowed()
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block_ss.add(files('vdi.c'))
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endif
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if get_option('cloop').allowed()
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block_ss.add(files('cloop.c'))
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endif
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if get_option('bochs').allowed()
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block_ss.add(files('bochs.c'))
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endif
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if get_option('vvfat').allowed()
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block_ss.add(files('vvfat.c'))
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endif
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if get_option('dmg').allowed()
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block_ss.add(files('dmg.c'))
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endif
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if get_option('qed').allowed()
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block_ss.add(files(
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'qed-check.c',
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'qed-cluster.c',
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'qed-l2-cache.c',
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'qed-table.c',
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'qed.c',
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))
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endif
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if get_option('parallels').allowed()
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block_ss.add(files('parallels.c', 'parallels-ext.c'))
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endif
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block_ss.add(when: 'CONFIG_WIN32', if_true: files('file-win32.c', 'win32-aio.c'))
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block_ss.add(when: 'CONFIG_POSIX', if_true: [files('file-posix.c'), coref, iokit])
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block_ss.add(when: libiscsi, if_true: files('iscsi-opts.c'))
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block_ss.add(when: 'CONFIG_LINUX', if_true: files('nvme.c'))
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if not get_option('replication').disabled()
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block_ss.add(files('replication.c'))
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endif
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block_ss.add(when: libaio, if_true: files('linux-aio.c'))
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block_ss.add(when: linux_io_uring, if_true: files('io_uring.c'))
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block_modules = {}
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modsrc = []
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foreach m : [
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[curl, 'curl', files('curl.c')],
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[glusterfs, 'gluster', files('gluster.c')],
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[libiscsi, 'iscsi', [files('iscsi.c'), libm]],
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[libnfs, 'nfs', files('nfs.c')],
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[libssh, 'ssh', files('ssh.c')],
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[rbd, 'rbd', files('rbd.c')],
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]
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if m[0].found()
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module_ss = ss.source_set()
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module_ss.add(when: m[0], if_true: m[2])
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if enable_modules
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modsrc += module_ss.all_sources()
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endif
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block_modules += {m[1] : module_ss}
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endif
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endforeach
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# those are not exactly regular block modules, so treat them apart
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if get_option('dmg').allowed()
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foreach m : [
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[liblzfse, 'dmg-lzfse', liblzfse, 'dmg-lzfse.c'],
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[libbzip2, 'dmg-bz2', [glib, libbzip2], 'dmg-bz2.c']
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]
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if m[0].found()
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module_ss = ss.source_set()
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module_ss.add(when: m[2], if_true: files(m[3]))
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block_modules += {m[1] : module_ss}
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endif
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endforeach
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endif
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module_block_py = find_program('../scripts/modules/module_block.py')
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module_block_h = custom_target('module_block.h',
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output: 'module_block.h',
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input: modsrc,
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command: [module_block_py, '@OUTPUT0@', modsrc])
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block_ss.add(module_block_h)
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wrapper_py = find_program('../scripts/block-coroutine-wrapper.py')
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block_gen_c = custom_target('block-gen.c',
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output: 'block-gen.c',
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input: files(
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'../include/block/block-io.h',
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'../include/block/block-global-state.h',
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'coroutines.h'
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),
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command: [wrapper_py, '@OUTPUT@', '@INPUT@'])
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block_ss.add(block_gen_c)
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block_ss.add(files('stream.c'))
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softmmu_ss.add(files('qapi-sysemu.c'))
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subdir('export')
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subdir('monitor')
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modules += {'block': block_modules}
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