NetApp specific hardware handler to filter out vendor-specific
sense code.
Signed-off-by: Martin George <marting@xxxxxxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/device_handler/Kconfig | 6 +
drivers/scsi/device_handler/Makefile | 1 +
drivers/scsi/device_handler/scsi_dh_ontap.c | 157 +++++++++++++++++++++++++++
3 files changed, 164 insertions(+), 0 deletions(-)
create mode 100644 drivers/scsi/device_handler/scsi_dh_ontap.c
diff --git a/drivers/scsi/device_handler/Kconfig b/drivers/scsi/device_handler/Kconfig
index 6707025..841e0e4 100644
--- a/drivers/scsi/device_handler/Kconfig
+++ b/drivers/scsi/device_handler/Kconfig
@@ -31,6 +31,12 @@ config SCSI_DH_EMC
help
If you have a EMC CLARiiON select y. Otherwise, say N.
+config SCSI_DH_ONTAP
+ tristate "NetApp Device Handler"
+ depends on SCSI_DH
+ help
+ If you have a NetApp controller select y. Otherwise, say N.
+
config SCSI_DH_ALUA
tristate "SPC-3 ALUA Device Handler (EXPERIMENTAL)"
depends on SCSI_DH && EXPERIMENTAL
diff --git a/drivers/scsi/device_handler/Makefile b/drivers/scsi/device_handler/Makefile
index e1d2ea0..abfb9db 100644
--- a/drivers/scsi/device_handler/Makefile
+++ b/drivers/scsi/device_handler/Makefile
@@ -5,4 +5,5 @@ obj-$(CONFIG_SCSI_DH) += scsi_dh.o
obj-$(CONFIG_SCSI_DH_RDAC) += scsi_dh_rdac.o
obj-$(CONFIG_SCSI_DH_HP_SW) += scsi_dh_hp_sw.o
obj-$(CONFIG_SCSI_DH_EMC) += scsi_dh_emc.o
+obj-$(CONFIG_SCSI_DH_ONTAP) += scsi_dh_ontap.o
obj-$(CONFIG_SCSI_DH_ALUA) += scsi_dh_alua.o
diff --git a/drivers/scsi/device_handler/scsi_dh_ontap.c b/drivers/scsi/device_handler/scsi_dh_ontap.c
new file mode 100644
index 0000000..175d657
--- /dev/null
+++ b/drivers/scsi/device_handler/scsi_dh_ontap.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2008 NetApp, Inc., All Rights Reserved
+ * Author: Martin George available at marting@xxxxxxxxxx
+ *
+ * This file is released under the GPL.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License v2 for more details.
+ */
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_dh.h>
+
+#define ONTAP_NAME "ontap"
+
+#define ONTAP_STATE_ACTIVE 0
+#define ONTAP_STATE_PASSIVE 1
+
+struct ontap_dh_data {
+ /* To add more members here later */
+ unsigned char state;
+};
+
+static inline struct ontap_dh_data *get_ontap_data(struct scsi_device *sdev)
+{
+ struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
+
+ BUG_ON(scsi_dh_data == NULL);
+ return ((struct ontap_dh_data *) scsi_dh_data->buf);
+}
+
+static int ontap_prep_fn(struct scsi_device *sdev, struct request *req)
+{
+ struct ontap_dh_data *h = get_ontap_data(sdev);
+ int ret = BLKPREP_OK;
+
+ if (h->state != ONTAP_STATE_ACTIVE) {
+ ret = BLKPREP_KILL;
+ req->cmd_flags |= REQ_QUIET;
+ }
+ return ret;
+}
+
+static int ontap_check_sense(struct scsi_device *sdev,
+ struct scsi_sense_hdr *sense_hdr)
+{
+ struct ontap_dh_data *h = get_ontap_data(sdev);
+
+ switch (sense_hdr->sense_key) {
+ case HARDWARE_ERROR:
+ if (sense_hdr->asc == 0x5D && sense_hdr->ascq == 0x12) {
+ /* Failed write on NetApp controller
+ * Fail the IO */
+ h->state = ONTAP_STATE_PASSIVE;
+ return FAILED;
+ }
+ break;
+ }
+
+ /* Do not care what scsi-ml does */
+ return SCSI_RETURN_NOT_HANDLED;
+}
+
+const struct scsi_dh_devlist ontap_dev_list[] = {
+ {"NETAPP", "LUN"},
+ {NULL, NULL},
+};
+
+static int ontap_bus_attach(struct scsi_device *sdev);
+static void ontap_bus_detach(struct scsi_device *sdev);
+
+static struct scsi_device_handler ontap_dh = {
+ .name = ONTAP_NAME,
+ .module = THIS_MODULE,
+ .devlist = ontap_dev_list,
+ .attach = ontap_bus_attach,
+ .detach = ontap_bus_detach,
+ .check_sense = ontap_check_sense,
+ .prep_fn = ontap_prep_fn,
+};
+
+static int ontap_bus_attach(struct scsi_device *sdev)
+{
+ struct scsi_dh_data *scsi_dh_data;
+ struct ontap_dh_data *h;
+ unsigned long flags;
+ int i, found = 0;
+
+ scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
+ + sizeof(*h) , GFP_KERNEL);
+ if (!scsi_dh_data) {
+ sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
+ ONTAP_NAME);
+ return -ENOMEM;
+ }
+
+ scsi_dh_data->scsi_dh = &ontap_dh;
+ h = (struct ontap_dh_data *) scsi_dh_data->buf;
+ h->state = ONTAP_STATE_ACTIVE;
+
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ sdev->scsi_dh_data = scsi_dh_data;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+
+ sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", ONTAP_NAME);
+
+ try_module_get(THIS_MODULE);
+
+ return 0;
+}
+
+static void ontap_bus_detach(struct scsi_device *sdev)
+{
+ struct scsi_dh_data *scsi_dh_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ scsi_dh_data = sdev->scsi_dh_data;
+ sdev->scsi_dh_data = NULL;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+
+ sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
+ ONTAP_NAME);
+
+ kfree(scsi_dh_data);
+ module_put(THIS_MODULE);
+}
+
+static int __init ontap_init(void)
+{
+ int r;
+
+ r = scsi_register_device_handler(&ontap_dh);
+ if (r != 0)
+ printk(KERN_ERR "%s: Failed to register scsi device handler.",
+ ONTAP_NAME);
+ return r;
+}
+
+static void __exit ontap_exit(void)
+{
+ scsi_unregister_device_handler(&ontap_dh);
+}
+
+module_init(ontap_init);
+module_exit(ontap_exit);
+
+MODULE_DESCRIPTION("NetApp controller driver");
+MODULE_AUTHOR("Martin George <marting@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
1.5.2.4
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