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charset="utf-8" We are going to implement reconnect-on-open. Let's reuse existing reconnect loop. For this, do initial connect in connection coroutine. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/nbd.c | 94 ++++++++++++++++++++++++++++++----------------------- 1 file changed, 53 insertions(+), 41 deletions(-) diff --git a/block/nbd.c b/block/nbd.c index 4548046cd7..16f039b7dc 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -57,6 +57,7 @@ typedef struct { } NBDClientRequest; =20 typedef enum NBDClientState { + NBD_CLIENT_OPENING, NBD_CLIENT_CONNECTING_WAIT, NBD_CLIENT_CONNECTING_NOWAIT, NBD_CLIENT_CONNECTED, @@ -113,6 +114,7 @@ typedef struct BDRVNBDState { CoQueue free_sema; Coroutine *connection_co; Coroutine *teardown_co; + Coroutine *open_co; QemuCoSleepState *connection_co_sleep_ns_state; bool drained; bool wait_drained_end; @@ -140,8 +142,6 @@ typedef struct BDRVNBDState { NBDConnectThread *connect_thread; } BDRVNBDState; =20 -static QIOChannelSocket *nbd_establish_connection(SocketAddress *saddr, - Error **errp); static QIOChannelSocket *nbd_co_establish_connection(BlockDriverState *bs, Error **errp); static void nbd_co_establish_connection_cancel(BlockDriverState *bs, @@ -338,7 +338,8 @@ static void nbd_teardown_connection(BlockDriverState *b= s) static bool nbd_client_connecting(BDRVNBDState *s) { return s->state =3D=3D NBD_CLIENT_CONNECTING_WAIT || - s->state =3D=3D NBD_CLIENT_CONNECTING_NOWAIT; + s->state =3D=3D NBD_CLIENT_CONNECTING_NOWAIT || + s->state =3D=3D NBD_CLIENT_OPENING; } =20 static bool nbd_client_connecting_wait(BDRVNBDState *s) @@ -638,6 +639,7 @@ static coroutine_fn void nbd_co_reconnect_loop(BDRVNBDS= tate *s) { uint64_t timeout =3D 1 * NANOSECONDS_PER_SECOND; uint64_t max_timeout =3D 16 * NANOSECONDS_PER_SECOND; + bool initial_connect =3D s->state =3D=3D NBD_CLIENT_OPENING; =20 if (s->state =3D=3D NBD_CLIENT_CONNECTING_WAIT) { reconnect_delay_timer_init(s, qemu_clock_get_ns(QEMU_CLOCK_REALTIM= E) + @@ -646,6 +648,25 @@ static coroutine_fn void nbd_co_reconnect_loop(BDRVNBD= State *s) =20 nbd_reconnect_attempt(s); =20 + if (initial_connect) { + if (s->state =3D=3D NBD_CLIENT_CONNECTED) { + /* All good. Just kick nbd_open() to successfully return */ + if (s->open_co) { + aio_co_wake(s->open_co); + s->open_co =3D NULL; + } + aio_wait_kick(); + return; + } else { + /* + * Failed. Currently, reconnect on open is not allowed, so qui= t. + * nbd_open() will be kicked in the end of nbd_connection_entr= y() + */ + s->state =3D NBD_CLIENT_QUIT; + return; + } + } + while (nbd_client_connecting(s)) { if (s->drained) { bdrv_dec_in_flight(s->bs); @@ -758,6 +779,11 @@ static coroutine_fn void nbd_connection_entry(void *op= aque) s->ioc =3D NULL; } =20 + if (s->open_co) { + aio_co_wake(s->open_co); + s->open_co =3D NULL; + } + if (s->teardown_co) { aio_co_wake(s->teardown_co); } @@ -1746,26 +1772,6 @@ static void nbd_client_close(BlockDriverState *bs) nbd_teardown_connection(bs); } =20 -static QIOChannelSocket *nbd_establish_connection(SocketAddress *saddr, - Error **errp) -{ - ERRP_GUARD(); - QIOChannelSocket *sioc; - - sioc =3D qio_channel_socket_new(); - qio_channel_set_name(QIO_CHANNEL(sioc), "nbd-client"); - - qio_channel_socket_connect_sync(sioc, saddr, errp); - if (*errp) { - object_unref(OBJECT(sioc)); - return NULL; - } - - qio_channel_set_delay(QIO_CHANNEL(sioc), false); - - return sioc; -} - /* nbd_client_handshake takes ownership on sioc. On failure it is unref'ed= . */ static int nbd_client_handshake(BlockDriverState *bs, QIOChannelSocket *si= oc, Error **errp) @@ -2229,7 +2235,6 @@ static int nbd_open(BlockDriverState *bs, QDict *opti= ons, int flags, { int ret; BDRVNBDState *s =3D (BDRVNBDState *)bs->opaque; - QIOChannelSocket *sioc; =20 ret =3D nbd_process_options(bs, options, errp); if (ret < 0) { @@ -2239,23 +2244,7 @@ static int nbd_open(BlockDriverState *bs, QDict *opt= ions, int flags, s->bs =3D bs; qemu_co_mutex_init(&s->send_mutex); qemu_co_queue_init(&s->free_sema); - - /* - * establish TCP connection, return error if it fails - * TODO: Configurable retry-until-timeout behaviour. - */ - sioc =3D nbd_establish_connection(s->saddr, errp); - if (!sioc) { - return -ECONNREFUSED; - } - - ret =3D nbd_client_handshake(bs, sioc, errp); - if (ret < 0) { - nbd_clear_bdrvstate(s); - return ret; - } - /* successfully connected */ - s->state =3D NBD_CLIENT_CONNECTED; + s->state =3D NBD_CLIENT_OPENING; =20 nbd_init_connect_thread(s); =20 @@ -2263,6 +2252,29 @@ static int nbd_open(BlockDriverState *bs, QDict *opt= ions, int flags, bdrv_inc_in_flight(bs); aio_co_schedule(bdrv_get_aio_context(bs), s->connection_co); =20 + if (qemu_in_coroutine()) { + s->open_co =3D qemu_coroutine_self(); + qemu_coroutine_yield(); + } else { + BDRV_POLL_WHILE(bs, s->state =3D=3D NBD_CLIENT_OPENING); + } + + if (s->state !=3D NBD_CLIENT_CONNECTED && s->connect_status < 0) { + /* + * It's possible that state !=3D NBD_CLIENT_CONNECTED, but connect= _status + * is 0. This means that initial connecting succeed, but failed la= ter + * (during BDRV_POLL_WHILE). It's a rare case, but it happen in io= test + * 83. Let's don't care and just report success in this case: it n= ot + * much differs from the case when connection failed immediately a= fter + * succeeded open. + */ + assert(s->connect_err); + error_propagate(errp, s->connect_err); + s->connect_err =3D NULL; + nbd_clear_bdrvstate(s); + return s->connect_status; + } + return 0; } =20 --=20 2.21.3 From nobody Sun May 5 03:15:56 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1dmarc=pass fromdomain=virtuozzo.com); dmarc=pass(p=quarantine dis=none) header.from=virtuozzo.com ARC-Seal: i=2; a=rsa-sha256; t=1599474372; cv=pass; d=zohomail.com; s=zohoarc; b=fC0BFjja4D9ovpiWtZg/eGyzE1MVYBEqrRr811iPSGl4SZly/V7CUuHUS1EnGySp68uNTANXP/nWddvjMoDCD//jkh1r74Wt1B4/cNT0s6dJE0cRRiPMODWJ/2B29RlECyrHZORY4dE/VK1UC9YJHNjvY8nENQOYlRkAacXr9uY= ARC-Message-Signature: i=2; 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charset="utf-8" Note: currently, using new option with long timeout in qmp command blockdev-add is not good idea, as qmp interface is blocking, so, don't add it now, let's add it later after "monitor: Optionally run handlers in coroutines" series merged. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/nbd.c | 115 +++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 92 insertions(+), 23 deletions(-) diff --git a/block/nbd.c b/block/nbd.c index 16f039b7dc..8fea5ededb 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -125,12 +125,14 @@ typedef struct BDRVNBDState { bool wait_in_flight; =20 QEMUTimer *reconnect_delay_timer; + QEMUTimer *open_timer; =20 NBDClientRequest requests[MAX_NBD_REQUESTS]; NBDReply reply; BlockDriverState *bs; =20 /* Connection parameters */ + uint64_t open_timeout; uint32_t reconnect_delay; SocketAddress *saddr; char *export, *tlscredsid; @@ -304,7 +306,7 @@ static void coroutine_fn nbd_client_co_drain_end(BlockD= riverState *bs) } =20 =20 -static void nbd_teardown_connection(BlockDriverState *bs) +static void nbd_teardown_connection_async(BlockDriverState *bs) { BDRVNBDState *s =3D (BDRVNBDState *)bs->opaque; =20 @@ -324,6 +326,14 @@ static void nbd_teardown_connection(BlockDriverState *= bs) } nbd_co_establish_connection_cancel(bs, true); } +} + +static void nbd_teardown_connection(BlockDriverState *bs) +{ + BDRVNBDState *s =3D (BDRVNBDState *)bs->opaque; + + nbd_teardown_connection_async(bs); + if (qemu_in_coroutine()) { s->teardown_co =3D qemu_coroutine_self(); /* connection_co resumes us when it terminates */ @@ -473,6 +483,11 @@ nbd_co_establish_connection(BlockDriverState *bs, Erro= r **errp) s->wait_connect =3D true; qemu_coroutine_yield(); =20 + if (!s->connect_thread) { + error_setg(errp, "Connection attempt cancelled by other operation"= ); + return NULL; + } + qemu_mutex_lock(&thr->mutex); =20 switch (thr->state) { @@ -528,6 +543,12 @@ static void nbd_co_establish_connection_cancel(BlockDr= iverState *bs, bool wake =3D false; bool do_free =3D false; =20 + if (!thr) { + /* already detached or finished */ + assert(!s->wait_connect); + return; + } + qemu_mutex_lock(&thr->mutex); =20 if (thr->state =3D=3D CONNECT_THREAD_RUNNING) { @@ -623,10 +644,15 @@ static coroutine_fn void nbd_reconnect_attempt(BDRVNB= DState *s) bdrv_inc_in_flight(s->bs); =20 out: - s->connect_status =3D ret; - error_free(s->connect_err); - s->connect_err =3D NULL; - error_propagate(&s->connect_err, local_err); + if (s->connect_status =3D=3D -ETIMEDOUT) { + /* Don't rewrite timeout error by following cancel-provoked error = */ + error_free(local_err); + } else { + s->connect_status =3D ret; + error_free(s->connect_err); + s->connect_err =3D NULL; + error_propagate(&s->connect_err, local_err); + } =20 if (ret >=3D 0) { /* successfully connected */ @@ -635,11 +661,44 @@ out: } } =20 +static void open_timer_del(BDRVNBDState *s) +{ + if (s->open_timer) { + timer_del(s->open_timer); + timer_free(s->open_timer); + s->open_timer =3D NULL; + } +} + +static void open_timer_cb(void *opaque) +{ + BDRVNBDState *s =3D opaque; + + if (!s->connect_status) { + /* First attempt was not finished. We should set an error */ + s->connect_status =3D -ETIMEDOUT; + error_setg(&s->connect_err, "First connection attempt is cancelled= by " + "timeout"); + } + + nbd_teardown_connection_async(s->bs); + open_timer_del(s); +} + +static void open_timer_init(BDRVNBDState *s, uint64_t expire_time_ns) +{ + assert(!s->open_timer && s->state =3D=3D NBD_CLIENT_OPENING); + s->open_timer =3D aio_timer_new(bdrv_get_aio_context(s->bs), + QEMU_CLOCK_REALTIME, + SCALE_NS, + open_timer_cb, s); + timer_mod(s->open_timer, expire_time_ns); +} + static coroutine_fn void nbd_co_reconnect_loop(BDRVNBDState *s) { uint64_t timeout =3D 1 * NANOSECONDS_PER_SECOND; uint64_t max_timeout =3D 16 * NANOSECONDS_PER_SECOND; - bool initial_connect =3D s->state =3D=3D NBD_CLIENT_OPENING; =20 if (s->state =3D=3D NBD_CLIENT_CONNECTING_WAIT) { reconnect_delay_timer_init(s, qemu_clock_get_ns(QEMU_CLOCK_REALTIM= E) + @@ -648,23 +707,9 @@ static coroutine_fn void nbd_co_reconnect_loop(BDRVNBD= State *s) =20 nbd_reconnect_attempt(s); =20 - if (initial_connect) { - if (s->state =3D=3D NBD_CLIENT_CONNECTED) { - /* All good. Just kick nbd_open() to successfully return */ - if (s->open_co) { - aio_co_wake(s->open_co); - s->open_co =3D NULL; - } - aio_wait_kick(); - return; - } else { - /* - * Failed. Currently, reconnect on open is not allowed, so qui= t. - * nbd_open() will be kicked in the end of nbd_connection_entr= y() - */ - s->state =3D NBD_CLIENT_QUIT; - return; - } + if (s->state =3D=3D NBD_CLIENT_OPENING && !s->open_timeout) { + s->state =3D NBD_CLIENT_QUIT; + return; } =20 while (nbd_client_connecting(s)) { @@ -694,6 +739,16 @@ static coroutine_fn void nbd_co_reconnect_loop(BDRVNBD= State *s) } =20 reconnect_delay_timer_del(s); + open_timer_del(s); + + if (s->state =3D=3D NBD_CLIENT_CONNECTED) { + /* All good. Just kick nbd_open() to successfully return */ + if (s->open_co) { + aio_co_wake(s->open_co); + s->open_co =3D NULL; + } + aio_wait_kick(); + } } =20 static coroutine_fn void nbd_connection_entry(void *opaque) @@ -2164,6 +2219,14 @@ static QemuOptsList nbd_runtime_opts =3D { "future requests before a successful reconnect will " "immediately fail. Default 0", }, + { + .name =3D "open-timeout", + .type =3D QEMU_OPT_NUMBER, + .help =3D "In seconds. If zero, nbd driver tries to establish " + "connection only once, on fail open fails. If non-zero= , " + "nbd driver may do several attempts until success or " + "@open-timeout seconds passed. Default 0", + }, { /* end of list */ } }, }; @@ -2219,6 +2282,7 @@ static int nbd_process_options(BlockDriverState *bs, = QDict *options, } =20 s->reconnect_delay =3D qemu_opt_get_number(opts, "reconnect-delay", 0); + s->open_timeout =3D qemu_opt_get_number(opts, "open-timeout", 0); =20 ret =3D 0; =20 @@ -2252,6 +2316,11 @@ static int nbd_open(BlockDriverState *bs, QDict *opt= ions, int flags, bdrv_inc_in_flight(bs); aio_co_schedule(bdrv_get_aio_context(bs), s->connection_co); =20 + if (s->open_timeout) { + open_timer_init(s, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + + s->open_timeout * NANOSECONDS_PER_SECOND); + } + if (qemu_in_coroutine()) { s->open_co =3D qemu_coroutine_self(); qemu_coroutine_yield(); --=20 2.21.3 From nobody Sun May 5 03:15:56 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" Signed-off-by: Vladimir Sementsov-Ogievskiy Signed-off-by: Denis V. Lunev --- tests/qemu-iotests/306 | 46 +++++++++++++++++++++++++++++++++++ tests/qemu-iotests/306.out | 5 ++++ tests/qemu-iotests/group | 1 + tests/qemu-iotests/iotests.py | 11 +++++++++ 4 files changed, 63 insertions(+) create mode 100755 tests/qemu-iotests/306 create mode 100644 tests/qemu-iotests/306.out diff --git a/tests/qemu-iotests/306 b/tests/qemu-iotests/306 new file mode 100755 index 0000000000..4b8b4090be --- /dev/null +++ b/tests/qemu-iotests/306 @@ -0,0 +1,46 @@ +#!/usr/bin/env python3 +# +# Test nbd reconnect on open +# +# Copyright (c) 2020 Virtuozzo International GmbH +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# + +import time + +import iotests +from iotests import qemu_img_create, file_path, qemu_io_popen, qemu_nbd + +disk, nbd_sock =3D file_path('disk', 'nbd-sock') +qemu_img_create('-f', iotests.imgfmt, disk, '1M') + +client =3D qemu_io_popen('--image-opts', '-c', 'read 0 1M', + 'driver=3Dnbd,__virtuozzo_open-reconnect-attempts= =3D4,' + 'server.type=3Dunix,server.path=3D' + nbd_sock) + +time.sleep(2) + +qemu_nbd('-k', nbd_sock, '-f', iotests.imgfmt, disk) + +iotests.log(client.communicate()[0], filters=3D[iotests.filter_qemu_io]) + +client =3D qemu_io_popen('--image-opts', '-c', 'read 0 1M', + 'driver=3Dnbd,__virtuozzo_open-reconnect-attempts= =3D1,' + 'server.type=3Dunix,server.path=3D' + nbd_sock) + +time.sleep(1.5) + +iotests.log(client.communicate()[0], filters=3D[iotests.filter_qemu_io, + iotests.filter_testfiles]) diff --git a/tests/qemu-iotests/306.out b/tests/qemu-iotests/306.out new file mode 100644 index 0000000000..82c74b4a2d --- /dev/null +++ b/tests/qemu-iotests/306.out @@ -0,0 +1,5 @@ +read 1048576/1048576 bytes at offset 0 +1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) + +can't open: Failed to connect socket TEST_DIR/PID-nbd-sock: No such file o= r directory + diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group index 5cad015231..e2b479ffb1 100644 --- a/tests/qemu-iotests/group +++ b/tests/qemu-iotests/group @@ -313,3 +313,4 @@ 302 quick 303 rw quick 304 rw quick +306 rw auto quick diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py index e197c73ca5..7d8f53fe19 100644 --- a/tests/qemu-iotests/iotests.py +++ b/tests/qemu-iotests/iotests.py @@ -195,6 +195,17 @@ def qemu_io_log(*args): log(result, filters=3D[filter_testfiles, filter_qemu_io]) return result =20 +def qemu_io_popen(*args): + '''Run qemu-nbd in daemon mode and return the parent's exit code''' + default_args =3D qemu_io_args[:] + + if ('-f' in args or '--image-opts' in args) and '-f' in default_args: + ind =3D default_args.index('-f') + del default_args[ind:ind+2] + + return subprocess.Popen(default_args + list(args), stdout=3Dsubprocess= .PIPE, + stderr=3Dsubprocess.STDOUT) + def qemu_io_silent(*args): '''Run qemu-io and return the exit code, suppressing stdout''' args =3D qemu_io_args + list(args) --=20 2.21.3