qemu/block
Vladimir Sementsov-Ogievskiy 9c98f145df dirty-bitmaps: clean-up bitmaps loading and migration logic
This patch aims to bring the following behavior:

1. We don't load bitmaps, when started in inactive mode. It's the case
of incoming migration. In this case we wait for bitmaps migration
through migration channel (if 'dirty-bitmaps' capability is enabled) or
for invalidation (to load bitmaps from the image).

2. We don't remove persistent bitmaps on inactivation. Instead, we only
remove bitmaps after storing. This is the only way to restore bitmaps,
if we decided to resume source after [failed] migration with
'dirty-bitmaps' capability enabled (which means, that bitmaps were not
stored).

3. We load bitmaps on open and any invalidation, it's ok for all cases:
  - normal open
  - migration target invalidation with dirty-bitmaps capability
    (bitmaps are migrating through migration channel, the are not
     stored, so they should have IN_USE flag set and will be skipped
     when loading. However, it would fail if bitmaps are read-only[1])
  - migration target invalidation without dirty-bitmaps capability
    (normal load of the bitmaps, if migrated with shared storage)
  - source invalidation with dirty-bitmaps capability
    (skip because IN_USE)
  - source invalidation without dirty-bitmaps capability
    (bitmaps were dropped, reload them)

[1]: to accurately handle this, migration of read-only bitmaps is
     explicitly forbidden in this patch.

New mechanism for not storing bitmaps when migrate with dirty-bitmaps
capability is introduced: migration filed in BdrvDirtyBitmap.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: John Snow <jsnow@redhat.com>
2018-10-29 16:23:17 -04:00
..
accounting.c block/accounting: introduce latency histogram 2018-03-19 14:58:37 -05:00
backup.c block/backup: make function variables consistently named 2018-08-31 16:28:33 +02:00
blkdebug.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
blklogwrites.c block: Use BdrvChild to discard 2018-07-10 16:01:52 +02:00
blkreplay.c trivial: Make bios files and source files non-executable 2018-09-25 17:26:18 +02:00
blkverify.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
block-backend.c block-backend: Set werror/rerror defaults in blk_new() 2018-10-01 19:13:46 +02:00
bochs.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
cloop.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
commit.c block/commit: refactor commit to use job callbacks 2018-09-25 15:31:15 +02:00
copy-on-read.c block: drop empty .bdrv_close handlers 2018-08-15 12:50:39 +02:00
create.c jobs: utilize job_exit shim 2018-08-31 16:28:33 +02:00
crypto.c luks: Allow share-rw=on 2018-08-15 12:50:39 +02:00
crypto.h block/crypto: Simplify block_crypto_{open,create}_opts_init() 2018-06-29 14:20:56 +02:00
curl.c curl: Make sslverify=off disable host as well as peer verification. 2018-09-24 23:46:05 -04:00
dirty-bitmap.c dirty-bitmaps: clean-up bitmaps loading and migration logic 2018-10-29 16:23:17 -04:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
dmg.h block: remove "qemu/osdep.h" from header file 2017-12-18 17:07:02 +03:00
file-posix.c file-posix: Forbid trying to change unsupported options during reopen 2018-10-01 12:51:12 +02:00
file-win32.c block: Prefix file driver trace points with "file_" 2018-07-10 16:01:51 +02:00
gluster.c block: Fix typos in comments (found by codespell) 2018-07-23 16:50:43 +02:00
io.c block: Use a single global AioWait 2018-09-25 15:50:15 +02:00
iscsi-opts.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
iscsi.c block: Use warn_report() & friends to report warnings 2018-10-19 14:51:34 +02:00
linux-aio.c block/linux-aio: acquire AioContext before qemu_laio_process_completions 2018-09-25 15:50:15 +02:00
Makefile.objs block: Add blklogwrites 2018-07-05 10:29:19 +02:00
mirror.c block/mirror: conservative mirror_exit refactor 2018-09-25 15:31:15 +02:00
nbd-client.c nbd/client: Add x-dirty-bitmap to query bitmap from server 2018-07-02 15:27:38 -05:00
nbd-client.h nbd/client: Add x-dirty-bitmap to query bitmap from server 2018-07-02 15:27:38 -05:00
nbd.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
nfs.c block: Convert .bdrv_truncate callback to coroutine_fn 2018-06-29 14:20:56 +02:00
null.c block: drop empty .bdrv_close handlers 2018-08-15 12:50:39 +02:00
nvme.c nvme: correct locking around completion 2018-10-12 09:46:14 +08:00
parallels.c parallels: Switch to byte-based calls 2018-06-29 14:20:56 +02:00
parallels.h Clean up includes 2018-02-09 05:05:11 +01:00
qapi.c block/qapi: Fix memory leak in qmp_query_blockstats() 2018-08-15 12:50:39 +02:00
qcow.c qcow: fix a reference leak 2018-07-30 15:35:37 +02:00
qcow2-bitmap.c dirty-bitmaps: clean-up bitmaps loading and migration logic 2018-10-29 16:23:17 -04:00
qcow2-cache.c qcow2: Allow configuring the L2 slice size 2018-02-13 17:00:00 +01:00
qcow2-cluster.c qcow2: Free allocated clusters on write error 2018-06-29 14:20:56 +02:00
qcow2-refcount.c Block layer patches: 2018-07-10 17:28:29 +01:00
qcow2-snapshot.c block: use local path for local headers 2018-05-31 04:16:06 +03:00
qcow2.c dirty-bitmaps: clean-up bitmaps loading and migration logic 2018-10-29 16:23:17 -04:00
qcow2.h bloc/qcow2: drop dirty_bitmaps_loaded state variable 2018-10-29 16:23:15 -04:00
qed-check.c block: convert bdrv_check callback to coroutine_fn 2018-03-09 15:17:47 +01:00
qed-cluster.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-l2-cache.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-table.c block: convert bdrv_check callback to coroutine_fn 2018-03-09 15:17:47 +01:00
qed.c error: Fix use of error_prepend() with &error_fatal, &error_abort 2018-10-19 14:51:34 +02:00
qed.h qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
quorum.c qapi: Drop qapi_event_send_FOO()'s Error ** argument 2018-08-28 18:21:38 +02:00
raw-format.c block: drop empty .bdrv_close handlers 2018-08-15 12:50:39 +02:00
rbd.c block: Use warn_report() & friends to report warnings 2018-10-19 14:51:34 +02:00
replication.c replication: Switch to byte-based calls 2018-06-29 14:20:56 +02:00
sheepdog.c block: Use warn_report() & friends to report warnings 2018-10-19 14:51:34 +02:00
snapshot.c block: make .bdrv_close optional 2018-08-15 12:50:39 +02:00
ssh.c block: Convert .bdrv_truncate callback to coroutine_fn 2018-06-29 14:20:56 +02:00
stream.c block/stream: refactor stream to use job callbacks 2018-09-25 15:31:15 +02:00
throttle-groups.c throttle-groups: Don't allow timers without throttled requests 2018-08-15 12:50:39 +02:00
throttle.c block: Use BdrvChild to discard 2018-07-10 16:01:52 +02:00
trace-events block: Add copy offloading trace points 2018-07-10 16:01:52 +02:00
vdi.c vdi: Use definitions from "qemu/units.h" 2018-07-02 14:45:23 +02:00
vhdx-endian.c block: use local path for local headers 2018-05-31 04:16:06 +03:00
vhdx-log.c block: use local path for local headers 2018-05-31 04:16:06 +03:00
vhdx.c block: Fix typos in comments (found by codespell) 2018-07-23 16:50:43 +02:00
vhdx.h block: vhdx - update PAYLOAD_BLOCK_UNMAPPED value to match 1.00 spec 2014-12-12 15:42:22 +00:00
vmdk.c vmdk: align end of file to a sector boundary 2018-09-26 10:47:18 +08:00
vpc.c vpc: Fail open on bad header checksum 2018-10-19 14:55:46 +02:00
vvfat.c block/vvfat: Disable debug message by default 2018-07-23 16:50:43 +02:00
vxhs.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
win32-aio.c file-win32: Switch to byte-based callbacks 2018-05-15 16:11:41 +02:00
write-threshold.c qapi: Drop qapi_event_send_FOO()'s Error ** argument 2018-08-28 18:21:38 +02:00