From cc9208123465166b5217d41f9a20e4b652463475 Mon Sep 17 00:00:00 2001

From: John Snow <jsnow@redhat.com>

Date: Wed, 18 Jul 2018 22:55:01 +0200

Subject: [PATCH 243/268] nbd/server: refactor NBDExportMetaContexts

RH-Author: John Snow <jsnow@redhat.com>

Message-id: <20180718225511.14878-26-jsnow@redhat.com>

Patchwork-id: 81413

O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 25/35] nbd/server: refactor NBDExportMetaContexts

Bugzilla: 1207657

RH-Acked-by: Eric Blake <eblake@redhat.com>

RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

RH-Acked-by: Fam Zheng <famz@redhat.com>

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Use NBDExport pointer instead of just export name: there is no need to

store a duplicated name in the struct; moreover, NBDExport will be used

further.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Message-Id: <20180609151758.17343-3-vsementsov@virtuozzo.com>

Reviewed-by: Eric Blake <eblake@redhat.com>

[eblake: commit message grammar tweak]

Signed-off-by: Eric Blake <eblake@redhat.com>

(cherry picked from commit af736e546717d832168dd332a328bfcf74a0ab3d)

Signed-off-by: John Snow <jsnow@redhat.com>

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

---

 nbd/server.c | 23 +++++++++++------------

 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/nbd/server.c b/nbd/server.c

index 942c016..26cc41a 100644

--- a/nbd/server.c

+++ b/nbd/server.c

@@ -88,7 +88,7 @@ static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);

  * as selected by NBD_OPT_SET_META_CONTEXT. Also used for

  * NBD_OPT_LIST_META_CONTEXT. */

 typedef struct NBDExportMetaContexts {

-    char export_name[NBD_MAX_NAME_SIZE + 1];

+    NBDExport *exp;

     bool valid; /* means that negotiation of the option finished without

                    errors */

     bool base_allocation; /* export base:allocation context (block status) */

@@ -399,10 +399,9 @@ static int nbd_negotiate_handle_list(NBDClient *client, Error **errp)

     return nbd_negotiate_send_rep(client, NBD_REP_ACK, errp);

 }

-static void nbd_check_meta_export_name(NBDClient *client)

+static void nbd_check_meta_export(NBDClient *client)

 {

-    client->export_meta.valid &= !strcmp(client->exp->name,

-                                         client->export_meta.export_name);

+    client->export_meta.valid &= client->exp == client->export_meta.exp;

 }

 /* Send a reply to NBD_OPT_EXPORT_NAME.

@@ -456,7 +455,7 @@ static int nbd_negotiate_handle_export_name(NBDClient *client,

     QTAILQ_INSERT_TAIL(&client->exp->clients, client, next);

     nbd_export_get(client->exp);

-    nbd_check_meta_export_name(client);

+    nbd_check_meta_export(client);

     return 0;

 }

@@ -650,7 +649,7 @@ static int nbd_negotiate_handle_info(NBDClient *client, uint16_t myflags,

         client->exp = exp;

         QTAILQ_INSERT_TAIL(&client->exp->clients, client, next);

         nbd_export_get(client->exp);

-        nbd_check_meta_export_name(client);

+        nbd_check_meta_export(client);

         rc = 1;

     }

     return rc;

@@ -835,7 +834,7 @@ static int nbd_negotiate_meta_queries(NBDClient *client,

                                       NBDExportMetaContexts *meta, Error **errp)

 {

     int ret;

-    NBDExport *exp;

+    char export_name[NBD_MAX_NAME_SIZE + 1];

     NBDExportMetaContexts local_meta;

     uint32_t nb_queries;

     int i;

@@ -854,15 +853,15 @@ static int nbd_negotiate_meta_queries(NBDClient *client,

     memset(meta, 0, sizeof(*meta));

-    ret = nbd_opt_read_name(client, meta->export_name, NULL, errp);

+    ret = nbd_opt_read_name(client, export_name, NULL, errp);

     if (ret <= 0) {

         return ret;

     }

-    exp = nbd_export_find(meta->export_name);

-    if (exp == NULL) {

+    meta->exp = nbd_export_find(export_name);

+    if (meta->exp == NULL) {

         return nbd_opt_drop(client, NBD_REP_ERR_UNKNOWN, errp,

-                            "export '%s' not present", meta->export_name);

+                            "export '%s' not present", export_name);

     }

     ret = nbd_opt_read(client, &nb_queries, sizeof(nb_queries), errp);

@@ -871,7 +870,7 @@ static int nbd_negotiate_meta_queries(NBDClient *client,

     }

     cpu_to_be32s(&nb_queries);

     trace_nbd_negotiate_meta_context(nbd_opt_lookup(client->opt),

-                                     meta->export_name, nb_queries);

+                                     export_name, nb_queries);

     if (client->opt == NBD_OPT_LIST_META_CONTEXT && !nb_queries) {

         /* enable all known contexts */

-- 

1.8.3.1