Shyam_Iyer@xxxxxxxx wrote:
-----Original Message-----
From: Daniel P. Berrange [mailto:berrange@xxxxxxxxxx]
Sent: Tuesday, November 17, 2009 11:21 PM
To: Dave Allan
Cc: Bellad, Sudhir; libvir-list@xxxxxxxxxx; Iyer, Shyam; Domsch, Matt;
KM, Paniraja
Subject: Re: [libvirt] Re: [Patch v0.4] iSCSI Multi-IQN (Libvirt
Support)
On Mon, Nov 16, 2009 at 01:58:08PM -0500, Dave Allan wrote:
diff --git a/src/storage_backend_iscsi.c
b/src/storage_backend_iscsi.c
index b516add..1fb21a5 100644
--- a/src/storage_backend_iscsi.c
+++ b/src/storage_backend_iscsi.c
@@ -39,6 +39,10 @@
#include "storage_backend_iscsi.h"
#include "util.h"
#include "memory.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
#define VIR_FROM_THIS VIR_FROM_STORAGE
@@ -159,13 +163,54 @@ virStorageBackendISCSIConnection(virConnectPtr
conn,
const char *portal,
const char *action)
{
- const char *const cmdargv[] = {
- ISCSIADM, "--mode", "node", "--portal", portal,
- "--targetname", pool->def->source.devices[0].path, action,
NULL
- };
-
- if (virRun(conn, cmdargv, NULL) < 0)
- return -1;
+ DIR *dir;
+ struct dirent *entry;
+
+
+ if (pool->def->source.initiator.iqnname != NULL) {
What's the point of this loop? At best, it's unneeded complexity,
at
worst it will match multiple interface names which will create the
multiple sessions per pool scenario that I explicitly want to avoid.
Secondly, if you want to do some sort of validation of the iqn, why
are
you reading from a hardcoded directory? Can you use the output of
iscsiadm? That is likely to be a more stable interface than the
directory which I would expect is a compile time option to the iscsi
initiator.
I'm really wondering much the same here - I don't see the purpose
in iterating over this directory. The iqn given in the XML ought
to be able to be passed straight to iscsadm's -I parameter
Iscsiadm's -I parameter takes iface name as the parameter value and not
the iqn name.
So I believe this approach could be taken -
1) Get the iqn for the corresponding iface name using the following
command
#iscsiadm -m iface
Example output:
[root@localhost libvirt-0.7.1-15-org]# iscsiadm -m iface
default tcp,default,default,unknown
iser iser,default,default,unknown
bnx2i bnx2i,default,default,unknown
iface1 tcp,default,default,iqn.1994-05.com.fedora:iqnBellad
iface3 tcp,default,default,iqn.dell
iface0 tcp,unknown,unknown,iqn.1994-05.com.fedora:iqnSudhir
The last value is the initiator iqn name.
Oh, ok, that makes sense. If you use the output of iscsiadm and STREQ
on a portion of the output instead of strstr to match the iqn, that
should be fine. You should also break out of the loop once you've
matched the iqn.
Dave
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