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[Qemu-devel] [PATCH v6 0/7] NBD reconnect
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH v6 0/7] NBD reconnect |
Date: |
Thu, 11 Apr 2019 20:27:02 +0300 |
Here is NBD reconnect. Previously, if connection failed all current
and future requests will fail. After the series, nbd-client driver
will try to reconnect unlimited times. During first @reconnect-delay
seconds of reconnecting all requests will wait for the connection,
and if it is established requests will be resent. After
@reconnect-delay period all requests will be failed (until successful
reconnect).
v4->v6:
(some preparing patches from v4 was merged as v5)
01: new
02: new
03: - drop unused things
- future states
- future s/break/continue/
04: - fix typos
- s/3.1/4.1/
- set 0 as default
05: new
06: - new states and s/break/continue/ moved here from 03
- drop NBDClientSession.receiving, as now in_flight
requests used instread
- add copyright
- go to NBD_CLIENT_CONNECTING_NOWAIT immediately if
reconnect_delay is 0 (so, reconnect_delay moved to
NBDClientSession)
- on close, do qemu_co_sleep_wake(client->connection_co),
to not wait for reconnect loop iteration
- handle state transition to QUIT during reconnect loop
(assert(nbd_client_connecting(s)) was bad idea)
- don't try to fail on protocol errors after
nbd_client_connect, as we can't distinguish them
- decrement in_flight around reconnect sleep to make
it possible to drain and exit during it
(v4 was based on something before in_flight logic
introduced into nbd-client)
- changed logic in nbd_client_attach_aio_context
07: - refactor, using log and qmp_log
- drop export name
- drop strange try/except
- add reconnect-delay option (as 0 is a default now)
Vladimir Sementsov-Ogievskiy (7):
block/nbd-client: split connection_co start out of nbd_client_connect
block/nbd-client: use non-blocking io channel for nbd negotiation
block/nbd-client: move from quit to state
block/nbd: add cmdline and qapi parameter reconnect-delay
qemu-coroutine-sleep: introduce qemu_co_sleep_wake
block/nbd-client: nbd reconnect
iotests: test nbd reconnect
qapi/block-core.json | 12 +-
block/nbd-client.h | 15 +-
include/block/nbd.h | 3 +-
include/qemu/coroutine.h | 6 +
block/nbd-client.c | 416 +++++++++++++++++++++++++---------
block/nbd.c | 16 +-
nbd/client.c | 16 +-
qemu-nbd.c | 2 +-
util/qemu-coroutine-sleep.c | 20 +-
tests/qemu-iotests/249 | 63 +++++
tests/qemu-iotests/249.out | 10 +
tests/qemu-iotests/group | 1 +
tests/qemu-iotests/iotests.py | 4 +
13 files changed, 468 insertions(+), 116 deletions(-)
create mode 100755 tests/qemu-iotests/249
create mode 100644 tests/qemu-iotests/249.out
--
2.18.0
- [Qemu-devel] [PATCH v6 0/7] NBD reconnect,
Vladimir Sementsov-Ogievskiy <=
- [Qemu-devel] [PATCH v6 4/7] block/nbd: add cmdline and qapi parameter reconnect-delay, Vladimir Sementsov-Ogievskiy, 2019/04/11
- [Qemu-devel] [PATCH v6 7/7] iotests: test nbd reconnect, Vladimir Sementsov-Ogievskiy, 2019/04/11
- [Qemu-devel] [PATCH v6 1/7] block/nbd-client: split connection_co start out of nbd_client_connect, Vladimir Sementsov-Ogievskiy, 2019/04/11
- [Qemu-devel] [PATCH v6 5/7] qemu-coroutine-sleep: introduce qemu_co_sleep_wake, Vladimir Sementsov-Ogievskiy, 2019/04/11
- [Qemu-devel] [PATCH v6 3/7] block/nbd-client: move from quit to state, Vladimir Sementsov-Ogievskiy, 2019/04/11
- [Qemu-devel] [PATCH v6 2/7] block/nbd-client: use non-blocking io channel for nbd negotiation, Vladimir Sementsov-Ogievskiy, 2019/04/11
- [Qemu-devel] [PATCH v6 6/7] block/nbd-client: nbd reconnect, Vladimir Sementsov-Ogievskiy, 2019/04/11
- Re: [Qemu-devel] [PATCH v6 0/7] NBD reconnect, Vladimir Sementsov-Ogievskiy, 2019/04/30