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[SCSI] libiscsi: handle param allocation failures 

If we could not allocate the initiator name or some other id like
the hwaddress or netdev, then userspace could deal with the failure
by just running in a dregraded mode.

Now we want to be able to switch values for the params and we
want some feedback, so this patch will check if a string like
the initiatorname could not be allocated and return an error.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Mike Christie 2009-05-13 17:57:40 -05:00 committed by James Bottomley
parent 184b57c630
commit 5700b1af93
1 changed files with 33 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
drivers/scsi/libiscsi.c
View File

@ -2656,6 +2656,23 @@ int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
}
EXPORT_SYMBOL_GPL(iscsi_conn_bind);
static int iscsi_switch_str_param(char **param, char *new_val_buf)
{
char *new_val;
if (*param) {
if (!strcmp(*param, new_val_buf))
return 0;
}
new_val = kstrdup(new_val_buf, GFP_NOIO);
if (!new_val)
return -ENOMEM;
kfree(*param);
*param = new_val;
return 0;
}
int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
enum iscsi_param param, char *buf, int buflen)
@ -2728,38 +2745,15 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
sscanf(buf, "%u", &conn->exp_statsn);
break;
case ISCSI_PARAM_USERNAME:
kfree(session->username);
session->username = kstrdup(buf, GFP_KERNEL);
if (!session->username)
return -ENOMEM;
break;
return iscsi_switch_str_param(&session->username, buf);
case ISCSI_PARAM_USERNAME_IN:
kfree(session->username_in);
session->username_in = kstrdup(buf, GFP_KERNEL);
if (!session->username_in)
return -ENOMEM;
break;
return iscsi_switch_str_param(&session->username_in, buf);
case ISCSI_PARAM_PASSWORD:
kfree(session->password);
session->password = kstrdup(buf, GFP_KERNEL);
if (!session->password)
return -ENOMEM;
break;
return iscsi_switch_str_param(&session->password, buf);
case ISCSI_PARAM_PASSWORD_IN:
kfree(session->password_in);
session->password_in = kstrdup(buf, GFP_KERNEL);
if (!session->password_in)
return -ENOMEM;
break;
return iscsi_switch_str_param(&session->password_in, buf);
case ISCSI_PARAM_TARGET_NAME:
/* this should not change between logins */
if (session->targetname)
break;
session->targetname = kstrdup(buf, GFP_KERNEL);
if (!session->targetname)
return -ENOMEM;
break;
return iscsi_switch_str_param(&session->targetname, buf);
case ISCSI_PARAM_TPGT:
sscanf(buf, "%d", &session->tpgt);
break;
@ -2767,25 +2761,11 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
sscanf(buf, "%d", &conn->persistent_port);
break;
case ISCSI_PARAM_PERSISTENT_ADDRESS:
/*
* this is the address returned in discovery so it should
* not change between logins.
*/
if (conn->persistent_address)
break;
conn->persistent_address = kstrdup(buf, GFP_KERNEL);
if (!conn->persistent_address)
return -ENOMEM;
break;
return iscsi_switch_str_param(&conn->persistent_address, buf);
case ISCSI_PARAM_IFACE_NAME:
if (!session->ifacename)
session->ifacename = kstrdup(buf, GFP_KERNEL);
break;
return iscsi_switch_str_param(&session->ifacename, buf);
case ISCSI_PARAM_INITIATOR_NAME:
if (!session->initiatorname)
session->initiatorname = kstrdup(buf, GFP_KERNEL);
break;
return iscsi_switch_str_param(&session->initiatorname, buf);
default:
return -ENOSYS;
}
@ -2856,10 +2836,7 @@ int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
len = sprintf(buf, "%s\n", session->ifacename);
break;
case ISCSI_PARAM_INITIATOR_NAME:
if (!session->initiatorname)
len = sprintf(buf, "%s\n", "unknown");
else
len = sprintf(buf, "%s\n", session->initiatorname);
len = sprintf(buf, "%s\n", session->initiatorname);
break;
default:
return -ENOSYS;
@ -2925,29 +2902,16 @@ int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
switch (param) {
case ISCSI_HOST_PARAM_NETDEV_NAME:
if (!ihost->netdev)
len = sprintf(buf, "%s\n", "default");
else
len = sprintf(buf, "%s\n", ihost->netdev);
len = sprintf(buf, "%s\n", ihost->netdev);
break;
case ISCSI_HOST_PARAM_HWADDRESS:
if (!ihost->hwaddress)
len = sprintf(buf, "%s\n", "default");
else
len = sprintf(buf, "%s\n", ihost->hwaddress);
len = sprintf(buf, "%s\n", ihost->hwaddress);
break;
case ISCSI_HOST_PARAM_INITIATOR_NAME:
if (!ihost->initiatorname)
len = sprintf(buf, "%s\n", "unknown");
else
len = sprintf(buf, "%s\n", ihost->initiatorname);
len = sprintf(buf, "%s\n", ihost->initiatorname);
break;
case ISCSI_HOST_PARAM_IPADDRESS:
if (!strlen(ihost->local_address))
len = sprintf(buf, "%s\n", "unknown");
else
len = sprintf(buf, "%s\n",
ihost->local_address);
len = sprintf(buf, "%s\n", ihost->local_address);
break;
default:
return -ENOSYS;
@ -2964,17 +2928,11 @@ int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
switch (param) {
case ISCSI_HOST_PARAM_NETDEV_NAME:
if (!ihost->netdev)
ihost->netdev = kstrdup(buf, GFP_KERNEL);
break;
return iscsi_switch_str_param(&ihost->netdev, buf);
case ISCSI_HOST_PARAM_HWADDRESS:
if (!ihost->hwaddress)
ihost->hwaddress = kstrdup(buf, GFP_KERNEL);
break;
return iscsi_switch_str_param(&ihost->hwaddress, buf);
case ISCSI_HOST_PARAM_INITIATOR_NAME:
if (!ihost->initiatorname)
ihost->initiatorname = kstrdup(buf, GFP_KERNEL);
break;
return iscsi_switch_str_param(&ihost->initiatorname, buf);
default:
return -ENOSYS;
}