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From cc9208123465166b5217d41f9a20e4b652463475 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Wed, 18 Jul 2018 22:55:01 +0200
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Subject: [PATCH 243/268] nbd/server: refactor NBDExportMetaContexts
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20180718225511.14878-26-jsnow@redhat.com>
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Patchwork-id: 81413
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 25/35] nbd/server: refactor NBDExportMetaContexts
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Bugzilla: 1207657
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Use NBDExport pointer instead of just export name: there is no need to
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store a duplicated name in the struct; moreover, NBDExport will be used
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further.
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Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Message-Id: <20180609151758.17343-3-vsementsov@virtuozzo.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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[eblake: commit message grammar tweak]
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Signed-off-by: Eric Blake <eblake@redhat.com>
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(cherry picked from commit af736e546717d832168dd332a328bfcf74a0ab3d)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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nbd/server.c | 23 +++++++++++------------
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1 file changed, 11 insertions(+), 12 deletions(-)
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diff --git a/nbd/server.c b/nbd/server.c
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index 942c016..26cc41a 100644
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--- a/nbd/server.c
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+++ b/nbd/server.c
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@@ -88,7 +88,7 @@ static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
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* as selected by NBD_OPT_SET_META_CONTEXT. Also used for
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* NBD_OPT_LIST_META_CONTEXT. */
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typedef struct NBDExportMetaContexts {
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- char export_name[NBD_MAX_NAME_SIZE + 1];
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+ NBDExport *exp;
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bool valid; /* means that negotiation of the option finished without
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errors */
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bool base_allocation; /* export base:allocation context (block status) */
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@@ -399,10 +399,9 @@ static int nbd_negotiate_handle_list(NBDClient *client, Error **errp)
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return nbd_negotiate_send_rep(client, NBD_REP_ACK, errp);
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}
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-static void nbd_check_meta_export_name(NBDClient *client)
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+static void nbd_check_meta_export(NBDClient *client)
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{
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- client->export_meta.valid &= !strcmp(client->exp->name,
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- client->export_meta.export_name);
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+ client->export_meta.valid &= client->exp == client->export_meta.exp;
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}
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/* Send a reply to NBD_OPT_EXPORT_NAME.
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@@ -456,7 +455,7 @@ static int nbd_negotiate_handle_export_name(NBDClient *client,
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QTAILQ_INSERT_TAIL(&client->exp->clients, client, next);
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nbd_export_get(client->exp);
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- nbd_check_meta_export_name(client);
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+ nbd_check_meta_export(client);
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return 0;
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}
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@@ -650,7 +649,7 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint16_t myflags,
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client->exp = exp;
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QTAILQ_INSERT_TAIL(&client->exp->clients, client, next);
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nbd_export_get(client->exp);
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- nbd_check_meta_export_name(client);
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+ nbd_check_meta_export(client);
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rc = 1;
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}
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return rc;
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@@ -835,7 +834,7 @@ static int nbd_negotiate_meta_queries(NBDClient *client,
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NBDExportMetaContexts *meta, Error **errp)
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{
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int ret;
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- NBDExport *exp;
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+ char export_name[NBD_MAX_NAME_SIZE + 1];
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NBDExportMetaContexts local_meta;
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uint32_t nb_queries;
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int i;
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@@ -854,15 +853,15 @@ static int nbd_negotiate_meta_queries(NBDClient *client,
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memset(meta, 0, sizeof(*meta));
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- ret = nbd_opt_read_name(client, meta->export_name, NULL, errp);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ ret = nbd_opt_read_name(client, export_name, NULL, errp);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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if (ret <= 0) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
return ret;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- exp = nbd_export_find(meta->export_name);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- if (exp == NULL) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ meta->exp = nbd_export_find(export_name);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ if (meta->exp == NULL) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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return nbd_opt_drop(client, NBD_REP_ERR_UNKNOWN, errp,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- "export '%s' not present", meta->export_name);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ "export '%s' not present", export_name);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
ret = nbd_opt_read(client, &nb_queries, sizeof(nb_queries), errp);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
@@ -871,7 +870,7 @@ static int nbd_negotiate_meta_queries(NBDClient *client,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
cpu_to_be32s(&nb_queries);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
trace_nbd_negotiate_meta_context(nbd_opt_lookup(client->opt),
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- meta->export_name, nb_queries);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ export_name, nb_queries);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
if (client->opt == NBD_OPT_LIST_META_CONTEXT && !nb_queries) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
/* enable all known contexts */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
1.8.3.1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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