Hi all! 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).
v7: almost all: rebased on merged nbd.c and nbd-client.c (including patch subject) 01-04: add Eric's r-b 04: wording 05: new 06: rewrite to remove timer earlier 07: new 08: - rebase on 05 and 07 - drop "All rights reserved" - handle drain - improve handling aio context attach 09: move 249 -> 257 Vladimir Sementsov-Ogievskiy (9): block/nbd: split connection_co start out of nbd_client_connect block/nbd: use non-blocking io channel for nbd negotiation block/nbd: move from quit to state block/nbd: add cmdline and qapi parameter reconnect-delay block/nbd: refactor nbd connection parameters qemu-coroutine-sleep: introduce qemu_co_sleep_wake qemu/units: add SI decimal units block/nbd: nbd reconnect iotests: test nbd reconnect qapi/block-core.json | 11 +- include/block/nbd.h | 3 +- include/qemu/coroutine.h | 17 +- include/qemu/units.h | 7 + block/nbd.c | 531 +++++++++++++++++++++++++--------- block/null.c | 2 +- block/sheepdog.c | 2 +- nbd/client.c | 16 +- qemu-nbd.c | 2 +- tests/test-bdrv-drain.c | 6 +- tests/test-block-iothread.c | 2 +- util/qemu-coroutine-sleep.c | 47 ++- tests/qemu-iotests/257 | 63 ++++ tests/qemu-iotests/257.out | 10 + tests/qemu-iotests/group | 1 + tests/qemu-iotests/iotests.py | 4 + 16 files changed, 551 insertions(+), 173 deletions(-) create mode 100755 tests/qemu-iotests/257 create mode 100644 tests/qemu-iotests/257.out -- 2.18.0
