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[Qemu-devel] [PATCH 3/3] nbd: Follow the BDS' AIO context
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH 3/3] nbd: Follow the BDS' AIO context |
Date: |
Sat, 14 Jun 2014 00:30:41 +0200 |
Keep the NBD server always in the same AIO context as the exported BDS
by calling bdrv_add_aio_context_notifier() and implementing the required
callbacks.
Signed-off-by: Max Reitz <address@hidden>
---
nbd.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/nbd.c b/nbd.c
index c25eac7..ae466da 100644
--- a/nbd.c
+++ b/nbd.c
@@ -812,6 +812,34 @@ static void nbd_request_put(NBDRequest *req)
nbd_client_put(client);
}
+static void bs_aio_attached(AioContext *ctx, void *opaque)
+{
+ NBDExport *exp = opaque;
+ NBDClient *client;
+
+ TRACE("Export %s: Attaching clients to AIO context %p\n", exp->name, ctx);
+
+ exp->ctx = ctx;
+
+ QTAILQ_FOREACH(client, &exp->clients, next) {
+ nbd_set_handlers(client);
+ }
+}
+
+static void bs_aio_detach(void *opaque)
+{
+ NBDExport *exp = opaque;
+ NBDClient *client;
+
+ TRACE("Export %s: Detaching clients from AIO context %p\n", exp->name,
exp->ctx);
+
+ QTAILQ_FOREACH(client, &exp->clients, next) {
+ nbd_unset_handlers(client);
+ }
+
+ exp->ctx = NULL;
+}
+
NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset,
off_t size, uint32_t nbdflags,
void (*close)(NBDExport *))
@@ -826,6 +854,7 @@ NBDExport *nbd_export_new(BlockDriverState *bs, off_t
dev_offset,
exp->close = close;
exp->ctx = bdrv_get_aio_context(bs);
bdrv_ref(bs);
+ bdrv_add_aio_context_notifier(bs, bs_aio_attached, bs_aio_detach, exp);
return exp;
}
@@ -873,6 +902,8 @@ void nbd_export_close(NBDExport *exp)
nbd_export_set_name(exp, NULL);
nbd_export_put(exp);
if (exp->bs) {
+ bdrv_remove_aio_context_notifier(exp->bs, bs_aio_attached,
+ bs_aio_detach, exp);
bdrv_unref(exp->bs);
exp->bs = NULL;
}
--
2.0.0