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authorAllan Stephens <allan.stephens@windriver.com>2011-11-07 17:00:54 -0500
committerPaul Gortmaker <paul.gortmaker@windriver.com>2012-02-24 17:05:17 -0500
commitbc9f8143ecf96c17a56635d2ef4c3c6b6ec27947 (patch)
tree7fad37cb7c78e88cba4b59aba374194cead93f56 /net/tipc/name_table.c
parent75aba9af2410ae8fc70600d9dcda0651f20e091e (diff)
downloadlinux-bc9f8143ecf96c17a56635d2ef4c3c6b6ec27947.tar.bz2
tipc: Revert name table translation optimization
Restores name table translation using a non-zero domain that is "out of scope", which was broken by an earlier commit (5d9c54c1e9ececcf7e99c4f014f9bec7ee3a7def). Comments have now been added to the name table translation routine to make it clear that there are actually three possible outcomes to a translation request (found/not found/deferred), rather than just two (found/not found). Note that a straightforward revert of the earlier commit is not possible, as other changes to the name table translation logic have occurred since the incorrect optimization was made. Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'net/tipc/name_table.c')
-rw-r--r--net/tipc/name_table.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index c2224f98e64f..c6a1ae36952e 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -539,10 +539,17 @@ struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower,
}
/*
- * tipc_nametbl_translate - translate name to port id
+ * tipc_nametbl_translate - perform name translation
*
- * Note: on entry 'destnode' is the search domain used during translation;
- * on exit it passes back the node address of the matching port (if any)
+ * On entry, 'destnode' is the search domain used during translation.
+ *
+ * On exit:
+ * - if name translation is deferred to another node/cluster/zone,
+ * leaves 'destnode' unchanged (will be non-zero) and returns 0
+ * - if name translation is attempted and succeeds, sets 'destnode'
+ * to publishing node and returns port reference (will be non-zero)
+ * - if name translation is attempted and fails, sets 'destnode' to 0
+ * and returns 0
*/
u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
@@ -552,6 +559,7 @@ u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
struct publication *publ;
struct name_seq *seq;
u32 ref = 0;
+ u32 node = 0;
if (!tipc_in_scope(*destnode, tipc_own_addr))
return 0;
@@ -609,11 +617,12 @@ u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
}
ref = publ->ref;
- *destnode = publ->node;
+ node = publ->node;
no_match:
spin_unlock_bh(&seq->lock);
not_found:
read_unlock_bh(&tipc_nametbl_lock);
+ *destnode = node;
return ref;
}