From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch changes ISCSI_OP_TEXT handling of SendTargets=[iqn.,eui.]
payloads to return explicit discovery information.
It adds checks to iscsit_process_text_cmd() and adds the special single
$TARGETNAME discovery case in iscsit_build_sendtargets_response() code.
Cc: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Cc: Mike Christie <michaelc@xxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target.c | 28 ++++++++++++++++++++++++++++
drivers/target/iscsi/iscsi_target_core.h | 1 +
2 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 0ce7a61..c1106bb 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -2021,6 +2021,9 @@ iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
}
if (!strncmp("=All", text_ptr, 4)) {
cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
+ } else if (!strncmp("=iqn.", text_ptr, 5) ||
+ !strncmp("=eui.", text_ptr, 5)) {
+ cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
} else {
pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
goto reject;
@@ -3403,6 +3406,7 @@ static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
struct iscsi_tpg_np *tpg_np;
int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
+ unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
SENDTARGETS_BUF_LIMIT);
@@ -3413,9 +3417,30 @@ static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
" response.\n");
return -ENOMEM;
}
+ /*
+ * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
+ * explicit case..
+ */
+ if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
+ text_ptr = strchr(text_in, '=');
+ if (!text_ptr) {
+ pr_err("Unable to locate '=' string in text_in:"
+ " %s\n", text_in);
+ return -EINVAL;
+ }
+ /*
+ * Skip over '=' character..
+ */
+ text_ptr += 1;
+ }
spin_lock(&tiqn_lock);
list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
+ if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
+ strcmp(tiqn->tiqn, text_ptr)) {
+ continue;
+ }
+
len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
len += 1;
@@ -3469,6 +3494,9 @@ static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
eob:
if (end_of_buf)
break;
+
+ if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
+ break;
}
spin_unlock(&tiqn_lock);
diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h
index ad46e73..3436a2c 100644
--- a/drivers/target/iscsi/iscsi_target_core.h
+++ b/drivers/target/iscsi/iscsi_target_core.h
@@ -134,6 +134,7 @@ enum cmd_flags_table {
ICF_OOO_CMDSN = 0x00000080,
ICF_REJECT_FAIL_CONN = 0x00000100,
IFC_SENDTARGETS_ALL = 0x00000200,
+ IFC_SENDTARGETS_SINGLE = 0x00000400,
};
/* struct iscsi_cmd->i_state */
--
1.7.2.5
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