qemu/block/meson.build
Vladimir Sementsov-Ogievskiy 1c14eaabdb block: introduce snapshot-access block driver
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>
2022-03-07 09:33:31 +01:00

152 lines
3.9 KiB
Meson

block_ss.add(genh)
block_ss.add(files(
'accounting.c',
'aio_task.c',
'amend.c',
'backup.c',
'copy-before-write.c',
'blkdebug.c',
'blklogwrites.c',
'blkverify.c',
'block-backend.c',
'block-copy.c',
'commit.c',
'copy-on-read.c',
'preallocate.c',
'progress_meter.c',
'create.c',
'crypto.c',
'dirty-bitmap.c',
'filter-compress.c',
'io.c',
'mirror.c',
'nbd.c',
'null.c',
'qapi.c',
'qcow2-bitmap.c',
'qcow2-cache.c',
'qcow2-cluster.c',
'qcow2-refcount.c',
'qcow2-snapshot.c',
'qcow2-threads.c',
'qcow2.c',
'quorum.c',
'raw-format.c',
'reqlist.c',
'snapshot.c',
'snapshot-access.c',
'throttle-groups.c',
'throttle.c',
'vhdx-endian.c',
'vhdx-log.c',
'vhdx.c',
'vmdk.c',
'vpc.c',
'write-threshold.c',
), zstd, zlib, gnutls)
softmmu_ss.add(when: 'CONFIG_TCG', if_true: files('blkreplay.c'))
if get_option('qcow1').allowed()
block_ss.add(files('qcow.c'))
endif
if get_option('vdi').allowed()
block_ss.add(files('vdi.c'))
endif
if get_option('cloop').allowed()
block_ss.add(files('cloop.c'))
endif
if get_option('bochs').allowed()
block_ss.add(files('bochs.c'))
endif
if get_option('vvfat').allowed()
block_ss.add(files('vvfat.c'))
endif
if get_option('dmg').allowed()
block_ss.add(files('dmg.c'))
endif
if get_option('qed').allowed()
block_ss.add(files(
'qed-check.c',
'qed-cluster.c',
'qed-l2-cache.c',
'qed-table.c',
'qed.c',
))
endif
if get_option('parallels').allowed()
block_ss.add(files('parallels.c', 'parallels-ext.c'))
endif
block_ss.add(when: 'CONFIG_WIN32', if_true: files('file-win32.c', 'win32-aio.c'))
block_ss.add(when: 'CONFIG_POSIX', if_true: [files('file-posix.c'), coref, iokit])
block_ss.add(when: libiscsi, if_true: files('iscsi-opts.c'))
block_ss.add(when: 'CONFIG_LINUX', if_true: files('nvme.c'))
if not get_option('replication').disabled()
block_ss.add(files('replication.c'))
endif
block_ss.add(when: libaio, if_true: files('linux-aio.c'))
block_ss.add(when: linux_io_uring, if_true: files('io_uring.c'))
block_modules = {}
modsrc = []
foreach m : [
[curl, 'curl', files('curl.c')],
[glusterfs, 'gluster', files('gluster.c')],
[libiscsi, 'iscsi', [files('iscsi.c'), libm]],
[libnfs, 'nfs', files('nfs.c')],
[libssh, 'ssh', files('ssh.c')],
[rbd, 'rbd', files('rbd.c')],
]
if m[0].found()
module_ss = ss.source_set()
module_ss.add(when: m[0], if_true: m[2])
if enable_modules
modsrc += module_ss.all_sources()
endif
block_modules += {m[1] : module_ss}
endif
endforeach
# those are not exactly regular block modules, so treat them apart
if get_option('dmg').allowed()
foreach m : [
[liblzfse, 'dmg-lzfse', liblzfse, 'dmg-lzfse.c'],
[libbzip2, 'dmg-bz2', [glib, libbzip2], 'dmg-bz2.c']
]
if m[0].found()
module_ss = ss.source_set()
module_ss.add(when: m[2], if_true: files(m[3]))
block_modules += {m[1] : module_ss}
endif
endforeach
endif
module_block_py = find_program('../scripts/modules/module_block.py')
module_block_h = custom_target('module_block.h',
output: 'module_block.h',
input: modsrc,
command: [module_block_py, '@OUTPUT0@', modsrc])
block_ss.add(module_block_h)
wrapper_py = find_program('../scripts/block-coroutine-wrapper.py')
block_gen_c = custom_target('block-gen.c',
output: 'block-gen.c',
input: files(
'../include/block/block-io.h',
'../include/block/block-global-state.h',
'coroutines.h'
),
command: [wrapper_py, '@OUTPUT@', '@INPUT@'])
block_ss.add(block_gen_c)
block_ss.add(files('stream.c'))
softmmu_ss.add(files('qapi-sysemu.c'))
subdir('export')
subdir('monitor')
modules += {'block': block_modules}