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bh=Pmjkdb0+ERHWohcq8Mm7mZ2buw4kA6iUKxv1ovZ4H2g=; b=JDlZGzeJPcOm4lWti0VBHo9n88XxEWlBIPkJ8LAITXCJU1YVAPeQYrmTlC9Kviy6YBvGf1 4z8EWrVSKk2MrVPu+AKmXgiHe6+h0ky5+F2A2y0klDu1W9ZvuwoydfntYuq3qbgJhjAz66 7SX29TairvXwKm+6fYWYpfszTLhY1XI= X-MC-Unique: 7KsAzXWJPF-n56WG2qJj_A-1 From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Subject: [PATCH v2 5/7] block-copy: add QemuMutex lock for BlockCopyCallState list Date: Tue, 18 May 2021 12:07:55 +0200 Message-Id: <20210518100757.31243-6-eesposit@redhat.com> In-Reply-To: <20210518100757.31243-1-eesposit@redhat.com> References: <20210518100757.31243-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eesposit@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.205.24.124; envelope-from=eesposit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.374, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Emanuele Giuseppe Esposito , Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org, Max Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" As for BlockCopyTask, add a lock to protect BlockCopyCallState ret and sleep_state fields. Also move ret, finished and cancelled in the OUT fields of BlockCopyCallState. Here a QemuMutex is used to protect QemuCoSleep field, since it can be concurrently invoked also from outside threads. .finished, .cancelled and reads to .ret and .error_is_read will be protected in the following patch. .sleep state is handled in the series "coroutine: new sleep/wake API" Signed-off-by: Emanuele Giuseppe Esposito --- block/block-copy.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/block/block-copy.c b/block/block-copy.c index 3a949fab64..d5ed5932b0 100644 --- a/block/block-copy.c +++ b/block/block-copy.c @@ -55,13 +55,14 @@ typedef struct BlockCopyCallState { QLIST_ENTRY(BlockCopyCallState) list; =20 /* State */ - int ret; bool finished; - QemuCoSleep sleep; - bool cancelled; + QemuCoSleep sleep; /* TODO: protect API with a lock */ =20 /* OUT parameters */ + bool cancelled; + /* Fields protected by calls_lock in BlockCopyState */ bool error_is_read; + int ret; } BlockCopyCallState; =20 typedef struct BlockCopyTask { @@ -110,6 +111,7 @@ typedef struct BlockCopyState { BlockCopyMethod method; CoMutex tasks_lock; QLIST_HEAD(, BlockCopyTask) tasks; /* All tasks from all block-copy ca= lls */ + QemuMutex calls_lock; QLIST_HEAD(, BlockCopyCallState) calls; /* State fields that use a thread-safe API */ BdrvDirtyBitmap *copy_bitmap; @@ -289,6 +291,7 @@ void block_copy_state_free(BlockCopyState *s) } =20 ratelimit_destroy(&s->rate_limit); + qemu_mutex_destroy(&s->calls_lock); bdrv_release_dirty_bitmap(s->copy_bitmap); shres_destroy(s->mem); g_free(s); @@ -349,6 +352,7 @@ BlockCopyState *block_copy_state_new(BdrvChild *source,= BdrvChild *target, =20 ratelimit_init(&s->rate_limit); qemu_co_mutex_init(&s->tasks_lock); + qemu_mutex_init(&s->calls_lock); QLIST_INIT(&s->tasks); QLIST_INIT(&s->calls); =20 @@ -492,11 +496,14 @@ static coroutine_fn int block_copy_task_entry(AioTask= *task) =20 ret =3D block_copy_do_copy(t->s, t->offset, t->bytes, t->zeroes, &error_is_read); - if (ret < 0 && !t->call_state->ret) { - t->call_state->ret =3D ret; - t->call_state->error_is_read =3D error_is_read; - } else { - progress_work_done(t->s->progress, t->bytes); + + WITH_QEMU_LOCK_GUARD(&t->s->calls_lock) { + if (ret < 0 && !t->call_state->ret) { + t->call_state->ret =3D ret; + t->call_state->error_is_read =3D error_is_read; + } else { + progress_work_done(t->s->progress, t->bytes); + } } co_put_to_shres(t->s->mem, t->bytes); block_copy_task_end(t, ret); @@ -740,7 +747,9 @@ static int coroutine_fn block_copy_common(BlockCopyCall= State *call_state) { int ret; =20 + qemu_mutex_lock(&call_state->s->calls_lock); QLIST_INSERT_HEAD(&call_state->s->calls, call_state, list); + qemu_mutex_unlock(&call_state->s->calls_lock); =20 do { ret =3D block_copy_dirty_clusters(call_state); @@ -767,7 +776,9 @@ static int coroutine_fn block_copy_common(BlockCopyCall= State *call_state) call_state->cb(call_state->cb_opaque); } =20 + qemu_mutex_lock(&call_state->s->calls_lock); QLIST_REMOVE(call_state, list); + qemu_mutex_unlock(&call_state->s->calls_lock); =20 return ret; } --=20 2.30.2