Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

14 files changed, 15489 insertions, 0 deletions

diff --git a/drivers/s390/scsi/Makefile b/drivers/s390/scsi/Makefile
new file mode 100644
index 00000000000..fc145307a7d
--- /dev/null
+++ b/drivers/s390/scsi/Makefile
@@ -0,0 +1,9 @@
+#
+# Makefile for the S/390 specific device drivers
+#
+
+zfcp-objs := zfcp_aux.o zfcp_ccw.o zfcp_scsi.o zfcp_erp.o zfcp_qdio.o \
+	     zfcp_fsf.o zfcp_sysfs_adapter.o zfcp_sysfs_port.o \
+	     zfcp_sysfs_unit.o zfcp_sysfs_driver.o
+
+obj-$(CONFIG_ZFCP) += zfcp.o
diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
new file mode 100644
index 00000000000..6a43322ccb0
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -0,0 +1,1977 @@
+/*
+ *
+ * linux/drivers/s390/scsi/zfcp_aux.c
+ *
+ * FCP adapter driver for IBM eServer zSeries
+ *
+ * (C) Copyright IBM Corp. 2002, 2004
+ *
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
+ *            Aron Zeh
+ *            Wolfgang Taphorn
+ *            Stefan Bader <stefan.bader@de.ibm.com>
+ *            Heiko Carstens <heiko.carstens@de.ibm.com>
+ *            Andreas Herrmann <aherrman@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define ZFCP_AUX_REVISION "$Revision: 1.145 $"
+
+#include "zfcp_ext.h"
+
+/* accumulated log level (module parameter) */
+static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
+static char *device;
+/*********************** FUNCTION PROTOTYPES *********************************/
+
+/* written against the module interface */
+static int __init  zfcp_module_init(void);
+
+/* FCP related */
+static void zfcp_ns_gid_pn_handler(unsigned long);
+
+/* miscellaneous */
+static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
+static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
+static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
+					      void __user *, size_t);
+static inline int zfcp_sg_list_copy_to_user(void __user *,
+					    struct zfcp_sg_list *, size_t);
+
+static int zfcp_cfdc_dev_ioctl(struct inode *, struct file *,
+	unsigned int, unsigned long);
+
+#define ZFCP_CFDC_IOC_MAGIC                     0xDD
+#define ZFCP_CFDC_IOC \
+	_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
+
+#ifdef CONFIG_COMPAT
+static struct ioctl_trans zfcp_ioctl_trans = {ZFCP_CFDC_IOC, (void*) sys_ioctl};
+#endif
+
+static struct file_operations zfcp_cfdc_fops = {
+	.ioctl = zfcp_cfdc_dev_ioctl
+};
+
+static struct miscdevice zfcp_cfdc_misc = {
+	.minor = ZFCP_CFDC_DEV_MINOR,
+	.name = ZFCP_CFDC_DEV_NAME,
+	.fops = &zfcp_cfdc_fops
+};
+
+/*********************** KERNEL/MODULE PARAMETERS  ***************************/
+
+/* declare driver module init/cleanup functions */
+module_init(zfcp_module_init);
+
+MODULE_AUTHOR("Heiko Carstens <heiko.carstens@de.ibm.com>, "
+	      "Andreas Herrman <aherrman@de.ibm.com>, "
+	      "Martin Peschke <mpeschke@de.ibm.com>, "
+	      "Raimund Schroeder <raimund.schroeder@de.ibm.com>, "
+	      "Wolfgang Taphorn <taphorn@de.ibm.com>, "
+	      "Aron Zeh <arzeh@de.ibm.com>, "
+	      "IBM Deutschland Entwicklung GmbH");
+MODULE_DESCRIPTION
+    ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
+MODULE_LICENSE("GPL");
+
+module_param(device, charp, 0);
+MODULE_PARM_DESC(device, "specify initial device");
+
+module_param(loglevel, uint, 0);
+MODULE_PARM_DESC(loglevel,
+		 "log levels, 8 nibbles: "
+		 "FC ERP QDIO CIO Config FSF SCSI Other, "
+		 "levels: 0=none 1=normal 2=devel 3=trace");
+
+#ifdef ZFCP_PRINT_FLAGS
+u32 flags_dump = 0;
+module_param(flags_dump, uint, 0);
+#endif
+
+/****************************************************************/
+/************** Functions without logging ***********************/
+/****************************************************************/
+
+void
+_zfcp_hex_dump(char *addr, int count)
+{
+	int i;
+	for (i = 0; i < count; i++) {
+		printk("%02x", addr[i]);
+		if ((i % 4) == 3)
+			printk(" ");
+		if ((i % 32) == 31)
+			printk("\n");
+	}
+	if (((i-1) % 32) != 31)
+		printk("\n");
+}
+
+/****************************************************************/
+/************** Uncategorised Functions *************************/
+/****************************************************************/
+
+#define ZFCP_LOG_AREA			ZFCP_LOG_AREA_OTHER
+
+static inline int
+zfcp_fsf_req_is_scsi_cmnd(struct zfcp_fsf_req *fsf_req)
+{
+	return ((fsf_req->fsf_command == FSF_QTCB_FCP_CMND) &&
+		!(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT));
+}
+
+void
+zfcp_cmd_dbf_event_fsf(const char *text, struct zfcp_fsf_req *fsf_req,
+		       void *add_data, int add_length)
+{
+	struct zfcp_adapter *adapter = fsf_req->adapter;
+	struct scsi_cmnd *scsi_cmnd;
+	int level = 3;
+	int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->dbf_lock, flags);
+	if (zfcp_fsf_req_is_scsi_cmnd(fsf_req)) {
+		scsi_cmnd = fsf_req->data.send_fcp_command_task.scsi_cmnd;
+		debug_text_event(adapter->cmd_dbf, level, "fsferror");
+		debug_text_event(adapter->cmd_dbf, level, text);
+		debug_event(adapter->cmd_dbf, level, &fsf_req,
+			    sizeof (unsigned long));
+		debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
+			    sizeof (u32));
+		debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
+			    sizeof (unsigned long));
+		debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
+			    min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
+		for (i = 0; i < add_length; i += ZFCP_CMD_DBF_LENGTH)
+			debug_event(adapter->cmd_dbf,
+				    level,
+				    (char *) add_data + i,
+				    min(ZFCP_CMD_DBF_LENGTH, add_length - i));
+	}
+	spin_unlock_irqrestore(&adapter->dbf_lock, flags);
+}
+
+/* XXX additionally log unit if available */
+/* ---> introduce new parameter for unit, see 2.4 code */
+void
+zfcp_cmd_dbf_event_scsi(const char *text, struct scsi_cmnd *scsi_cmnd)
+{
+	struct zfcp_adapter *adapter;
+	union zfcp_req_data *req_data;
+	struct zfcp_fsf_req *fsf_req;
+	int level = ((host_byte(scsi_cmnd->result) != 0) ? 1 : 5);
+	unsigned long flags;
+
+	adapter = (struct zfcp_adapter *) scsi_cmnd->device->host->hostdata[0];
+	req_data = (union zfcp_req_data *) scsi_cmnd->host_scribble;
+	fsf_req = (req_data ? req_data->send_fcp_command_task.fsf_req : NULL);
+	spin_lock_irqsave(&adapter->dbf_lock, flags);
+	debug_text_event(adapter->cmd_dbf, level, "hostbyte");
+	debug_text_event(adapter->cmd_dbf, level, text);
+	debug_event(adapter->cmd_dbf, level, &scsi_cmnd->result, sizeof (u32));
+	debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
+		    sizeof (unsigned long));
+	debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
+		    min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
+	if (likely(fsf_req)) {
+		debug_event(adapter->cmd_dbf, level, &fsf_req,
+			    sizeof (unsigned long));
+		debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
+			    sizeof (u32));
+	} else {
+		debug_text_event(adapter->cmd_dbf, level, "");
+		debug_text_event(adapter->cmd_dbf, level, "");
+	}
+	spin_unlock_irqrestore(&adapter->dbf_lock, flags);
+}
+
+void
+zfcp_in_els_dbf_event(struct zfcp_adapter *adapter, const char *text,
+		      struct fsf_status_read_buffer *status_buffer, int length)
+{
+	int level = 1;
+	int i;
+
+	debug_text_event(adapter->in_els_dbf, level, text);
+	debug_event(adapter->in_els_dbf, level, &status_buffer->d_id, 8);
+	for (i = 0; i < length; i += ZFCP_IN_ELS_DBF_LENGTH)
+		debug_event(adapter->in_els_dbf,
+			    level,
+			    (char *) status_buffer->payload + i,
+			    min(ZFCP_IN_ELS_DBF_LENGTH, length - i));
+}
+
+/**
+ * zfcp_device_setup - setup function
+ * @str: pointer to parameter string
+ *
+ * Parse "device=..." parameter string.
+ */
+static int __init
+zfcp_device_setup(char *str)
+{
+	char *tmp;
+
+	if (!str)
+		return 0;
+
+	tmp = strchr(str, ',');
+	if (!tmp)
+		goto err_out;
+	*tmp++ = '\0';
+	strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
+	zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
+
+	zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
+	if (*tmp++ != ',')
+		goto err_out;
+	if (*tmp == '\0')
+		goto err_out;
+
+	zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
+	if (*tmp != '\0')
+		goto err_out;
+	return 1;
+
+ err_out:
+	ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
+	return 0;
+}
+
+static void __init
+zfcp_init_device_configure(void)
+{
+	struct zfcp_adapter *adapter;
+	struct zfcp_port *port;
+	struct zfcp_unit *unit;
+
+	down(&zfcp_data.config_sema);
+	read_lock_irq(&zfcp_data.config_lock);
+	adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
+	if (adapter)
+		zfcp_adapter_get(adapter);
+	read_unlock_irq(&zfcp_data.config_lock);
+
+	if (adapter == NULL)
+		goto out_adapter;
+	port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
+	if (!port)
+		goto out_port;
+	unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
+	if (!unit)
+		goto out_unit;
+	up(&zfcp_data.config_sema);
+	ccw_device_set_online(adapter->ccw_device);
+	zfcp_erp_wait(adapter);
+	down(&zfcp_data.config_sema);
+	zfcp_unit_put(unit);
+ out_unit:
+	zfcp_port_put(port);
+ out_port:
+	zfcp_adapter_put(adapter);
+ out_adapter:
+	up(&zfcp_data.config_sema);
+	return;
+}
+
+static int __init
+zfcp_module_init(void)
+{
+
+	int retval = 0;
+
+	atomic_set(&zfcp_data.loglevel, loglevel);
+
+	/* initialize adapter list */
+	INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
+
+	/* initialize adapters to be removed list head */
+	INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
+
+	zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
+	if (!zfcp_transport_template)
+		return -ENODEV;
+
+	retval = register_ioctl32_conversion(zfcp_ioctl_trans.cmd,
+					     zfcp_ioctl_trans.handler);
+	if (retval != 0) {
+		ZFCP_LOG_INFO("registration of ioctl32 conversion failed\n");
+		goto out;
+	}
+
+	retval = misc_register(&zfcp_cfdc_misc);
+	if (retval != 0) {
+		ZFCP_LOG_INFO("registration of misc device "
+			      "zfcp_cfdc failed\n");
+		goto out_misc_register;
+	} else {
+		ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
+			       ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
+	}
+
+	/* Initialise proc semaphores */
+	sema_init(&zfcp_data.config_sema, 1);
+
+	/* initialise configuration rw lock */
+	rwlock_init(&zfcp_data.config_lock);
+
+	/* save address of data structure managing the driver module */
+	zfcp_data.scsi_host_template.module = THIS_MODULE;
+
+	/* setup dynamic I/O */
+	retval = zfcp_ccw_register();
+	if (retval) {
+		ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
+		goto out_ccw_register;
+	}
+
+	if (zfcp_device_setup(device))
+		zfcp_init_device_configure();
+
+	goto out;
+
+ out_ccw_register:
+	misc_deregister(&zfcp_cfdc_misc);
+ out_misc_register:
+	unregister_ioctl32_conversion(zfcp_ioctl_trans.cmd);
+ out:
+	return retval;
+}
+
+/*
+ * function:    zfcp_cfdc_dev_ioctl
+ *
+ * purpose:     Handle control file upload/download transaction via IOCTL
+ *		interface
+ *
+ * returns:     0           - Operation completed successfuly
+ *              -ENOTTY     - Unknown IOCTL command
+ *              -EINVAL     - Invalid sense data record
+ *              -ENXIO      - The FCP adapter is not available
+ *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
+ *              -ENOMEM     - Insufficient memory
+ *              -EFAULT     - User space memory I/O operation fault
+ *              -EPERM      - Cannot create or queue FSF request or create SBALs
+ *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
+ */
+static int
+zfcp_cfdc_dev_ioctl(struct inode *inode, struct file *file,
+                    unsigned int command, unsigned long buffer)
+{
+	struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
+	struct zfcp_adapter *adapter = NULL;
+	struct zfcp_fsf_req *fsf_req = NULL;
+	struct zfcp_sg_list *sg_list = NULL;
+	u32 fsf_command, option;
+	char *bus_id = NULL;
+	int retval = 0;
+
+	sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
+	if (sense_data == NULL) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
+	if (sg_list == NULL) {
+		retval = -ENOMEM;
+		goto out;
+	}
+	memset(sg_list, 0, sizeof(*sg_list));
+
+	if (command != ZFCP_CFDC_IOC) {
+		ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
+		retval = -ENOTTY;
+		goto out;
+	}
+
+	if ((sense_data_user = (void __user *) buffer) == NULL) {
+		ZFCP_LOG_INFO("sense data record is required\n");
+		retval = -EINVAL;
+		goto out;
+	}
+
+	retval = copy_from_user(sense_data, sense_data_user,
+				sizeof(struct zfcp_cfdc_sense_data));
+	if (retval) {
+		retval = -EFAULT;
+		goto out;
+	}
+
+	if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
+		ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
+			      ZFCP_CFDC_SIGNATURE);
+		retval = -EINVAL;
+		goto out;
+	}
+
+	switch (sense_data->command) {
+
+	case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
+		fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
+		option = FSF_CFDC_OPTION_NORMAL_MODE;
+		break;
+
+	case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
+		fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
+		option = FSF_CFDC_OPTION_FORCE;
+		break;
+
+	case ZFCP_CFDC_CMND_FULL_ACCESS:
+		fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
+		option = FSF_CFDC_OPTION_FULL_ACCESS;
+		break;
+
+	case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
+		fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
+		option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
+		break;
+
+	case ZFCP_CFDC_CMND_UPLOAD:
+		fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
+		option = 0;
+		break;
+
+	default:
+		ZFCP_LOG_INFO("invalid command code 0x%08x\n",
+			      sense_data->command);
+		retval = -EINVAL;
+		goto out;
+	}
+
+	bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
+	if (bus_id == NULL) {
+		retval = -ENOMEM;
+		goto out;
+	}
+	snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
+		(sense_data->devno >> 24),
+		(sense_data->devno >> 16) & 0xFF,
+		(sense_data->devno & 0xFFFF));
+
+	read_lock_irq(&zfcp_data.config_lock);
+	adapter = zfcp_get_adapter_by_busid(bus_id);
+	if (adapter)
+		zfcp_adapter_get(adapter);
+	read_unlock_irq(&zfcp_data.config_lock);
+
+	kfree(bus_id);
+
+	if (adapter == NULL) {
+		ZFCP_LOG_INFO("invalid adapter\n");
+		retval = -ENXIO;
+		goto out;
+	}
+
+	if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
+		retval = zfcp_sg_list_alloc(sg_list,
+					    ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
+		if (retval) {
+			retval = -ENOMEM;
+			goto out;
+		}
+	}
+
+	if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
+	    (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
+		retval = zfcp_sg_list_copy_from_user(
+			sg_list, &sense_data_user->control_file,
+			ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
+		if (retval) {
+			retval = -EFAULT;
+			goto out;
+		}
+	}
+
+	retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
+				       option, sg_list);
+	if (retval)
+		goto out;
+
+	if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
+	    (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
+		retval = -ENXIO;
+		goto out;
+	}
+
+	sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
+	memcpy(&sense_data->fsf_status_qual,
+	       &fsf_req->qtcb->header.fsf_status_qual,
+	       sizeof(union fsf_status_qual));
+	memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
+
+	retval = copy_to_user(sense_data_user, sense_data,
+		sizeof(struct zfcp_cfdc_sense_data));
+	if (retval) {
+		retval = -EFAULT;
+		goto out;
+	}
+
+	if (sense_data->command & ZFCP_CFDC_UPLOAD) {
+		retval = zfcp_sg_list_copy_to_user(
+			&sense_data_user->control_file, sg_list,
+			ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
+		if (retval) {
+			retval = -EFAULT;
+			goto out;
+		}
+	}
+
+ out:
+	if (fsf_req != NULL)
+		zfcp_fsf_req_cleanup(fsf_req);
+
+	if ((adapter != NULL) && (retval != -ENXIO))
+		zfcp_adapter_put(adapter);
+
+	if (sg_list != NULL) {
+		zfcp_sg_list_free(sg_list);
+		kfree(sg_list);
+	}
+
+	if (sense_data != NULL)
+		kfree(sense_data);
+
+	return retval;
+}
+
+
+/**
+ * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
+ * @sg_list: structure describing a scatter gather list
+ * @size: size of scatter-gather list
+ * Return: 0 on success, else -ENOMEM
+ *
+ * In sg_list->sg a pointer to the created scatter-gather list is returned,
+ * or NULL if we run out of memory. sg_list->count specifies the number of
+ * elements of the scatter-gather list. The maximum size of a single element
+ * in the scatter-gather list is PAGE_SIZE.
+ */
+static inline int
+zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
+{
+	struct scatterlist *sg;
+	unsigned int i;
+	int retval = 0;
+	void *address;
+
+	BUG_ON(sg_list == NULL);
+
+	sg_list->count = size >> PAGE_SHIFT;
+	if (size & ~PAGE_MASK)
+		sg_list->count++;
+	sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
+			      GFP_KERNEL);
+	if (sg_list->sg == NULL) {
+		sg_list->count = 0;
+		retval = -ENOMEM;
+		goto out;
+	}
+	memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
+
+	for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
+		sg->length = min(size, PAGE_SIZE);
+		sg->offset = 0;
+		address = (void *) get_zeroed_page(GFP_KERNEL);
+		if (address == NULL) {
+			sg_list->count = i;
+			zfcp_sg_list_free(sg_list);
+			retval = -ENOMEM;
+			goto out;
+		}
+		zfcp_address_to_sg(address, sg);
+		size -= sg->length;
+	}
+
+ out:
+	return retval;
+}
+
+
+/**
+ * zfcp_sg_list_free - free memory of a scatter-gather list
+ * @sg_list: structure describing a scatter-gather list
+ *
+ * Memory for each element in the scatter-gather list is freed.
+ * Finally sg_list->sg is freed itself and sg_list->count is reset.
+ */
+static inline void
+zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
+{
+	struct scatterlist *sg;
+	unsigned int i;
+
+	BUG_ON(sg_list == NULL);
+
+	for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
+		free_page((unsigned long) zfcp_sg_to_address(sg));
+
+	sg_list->count = 0;
+	kfree(sg_list->sg);
+}
+
+/**
+ * zfcp_sg_size - determine size of a scatter-gather list
+ * @sg: array of (struct scatterlist)
+ * @sg_count: elements in array
+ * Return: size of entire scatter-gather list
+ */
+size_t
+zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
+{
+	unsigned int i;
+	struct scatterlist *p;
+	size_t size;
+
+	size = 0;
+	for (i = 0, p = sg; i < sg_count; i++, p++) {
+		BUG_ON(p == NULL);
+		size += p->length;
+	}
+
+	return size;
+}
+
+
+/**
+ * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
+ * @sg_list: structure describing a scatter-gather list
+ * @user_buffer: pointer to buffer in user space
+ * @size: number of bytes to be copied
+ * Return: 0 on success, -EFAULT if copy_from_user fails.
+ */
+static inline int
+zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
+			    void __user *user_buffer,
+                            size_t size)
+{
+	struct scatterlist *sg;
+	unsigned int length;
+	void *zfcp_buffer;
+	int retval = 0;
+
+	BUG_ON(sg_list == NULL);
+
+	if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
+		return -EFAULT;
+
+	for (sg = sg_list->sg; size > 0; sg++) {
+		length = min((unsigned int)size, sg->length);
+		zfcp_buffer = zfcp_sg_to_address(sg);
+		if (copy_from_user(zfcp_buffer, user_buffer, length)) {
+			retval = -EFAULT;
+			goto out;
+		}
+		user_buffer += length;
+		size -= length;
+	}
+
+ out:
+	return retval;
+}
+
+
+/**
+ * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
+ * @user_buffer: pointer to buffer in user space
+ * @sg_list: structure describing a scatter-gather list
+ * @size: number of bytes to be copied
+ * Return: 0 on success, -EFAULT if copy_to_user fails
+ */
+static inline int
+zfcp_sg_list_copy_to_user(void __user  *user_buffer,
+			  struct zfcp_sg_list *sg_list,
+                          size_t size)
+{
+	struct scatterlist *sg;
+	unsigned int length;
+	void *zfcp_buffer;
+	int retval = 0;
+
+	BUG_ON(sg_list == NULL);
+
+	if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
+		return -EFAULT;
+
+	for (sg = sg_list->sg; size > 0; sg++) {
+		length = min((unsigned int) size, sg->length);
+		zfcp_buffer = zfcp_sg_to_address(sg);
+		if (copy_to_user(user_buffer, zfcp_buffer, length)) {
+			retval = -EFAULT;
+			goto out;
+		}
+		user_buffer += length;
+		size -= length;
+	}
+
+ out:
+	return retval;
+}
+
+
+#undef ZFCP_LOG_AREA
+
+/****************************************************************/
+/****** Functions for configuration/set-up of structures ********/
+/****************************************************************/
+
+#define ZFCP_LOG_AREA			ZFCP_LOG_AREA_CONFIG
+
+/**
+ * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
+ * @port: pointer to port to search for unit
+ * @fcp_lun: FCP LUN to search for
+ * Traverse list of all units of a port and return pointer to a unit
+ * with the given FCP LUN.
+ */
+struct zfcp_unit *
+zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
+{
+	struct zfcp_unit *unit;
+	int found = 0;
+
+	list_for_each_entry(unit, &port->unit_list_head, list) {
+		if ((unit->fcp_lun == fcp_lun) &&
+		    !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
+		{
+			found = 1;
+			break;
+		}
+	}
+	return found ? unit : NULL;
+}
+
+/**
+ * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
+ * @adapter: pointer to adapter to search for port
+ * @wwpn: wwpn to search for
+ * Traverse list of all ports of an adapter and return pointer to a port
+ * with the given wwpn.
+ */
+struct zfcp_port *
+zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
+{
+	struct zfcp_port *port;
+	int found = 0;
+
+	list_for_each_entry(port, &adapter->port_list_head, list) {
+		if ((port->wwpn == wwpn) &&
+		    !(atomic_read(&port->status) &
+		      (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
+			found = 1;
+			break;
+		}
+	}
+	return found ? port : NULL;
+}
+
+/**
+ * zfcp_get_port_by_did - find port in port list of adapter by d_id
+ * @adapter: pointer to adapter to search for port
+ * @d_id: d_id to search for
+ * Traverse list of all ports of an adapter and return pointer to a port
+ * with the given d_id.
+ */
+struct zfcp_port *
+zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
+{
+	struct zfcp_port *port;
+	int found = 0;
+
+	list_for_each_entry(port, &adapter->port_list_head, list) {
+		if ((port->d_id == d_id) &&
+		    !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
+		{
+			found = 1;
+			break;
+		}
+	}
+	return found ? port : NULL;
+}
+
+/**
+ * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
+ * @bus_id: bus_id to search for
+ * Traverse list of all adapters and return pointer to an adapter
+ * with the given bus_id.
+ */
+struct zfcp_adapter *
+zfcp_get_adapter_by_busid(char *bus_id)
+{
+	struct zfcp_adapter *adapter;
+	int found = 0;
+
+	list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
+		if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
+			     BUS_ID_SIZE) == 0) &&
+		    !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
+				      &adapter->status)){
+			found = 1;
+			break;
+		}
+	}
+	return found ? adapter : NULL;
+}
+
+/**
+ * zfcp_unit_enqueue - enqueue unit to unit list of a port.
+ * @port: pointer to port where unit is added
+ * @fcp_lun: FCP LUN of unit to be enqueued
+ * Return: pointer to enqueued unit on success, NULL on error
+ * Locks: config_sema must be held to serialize changes to the unit list
+ *
+ * Sets up some unit internal structures and creates sysfs entry.
+ */
+struct zfcp_unit *
+zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
+{
+	struct zfcp_unit *unit, *tmp_unit;
+	scsi_lun_t scsi_lun;
+	int found;
+
+	/*
+	 * check that there is no unit with this FCP_LUN already in list
+	 * and enqueue it.
+	 * Note: Unlike for the adapter and the port, this is an error
+	 */
+	read_lock_irq(&zfcp_data.config_lock);
+	unit = zfcp_get_unit_by_lun(port, fcp_lun);
+	read_unlock_irq(&zfcp_data.config_lock);
+	if (unit)
+		return NULL;
+
+	unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
+	if (!unit)
+		return NULL;
+	memset(unit, 0, sizeof (struct zfcp_unit));
+
+	/* initialise reference count stuff */
+	atomic_set(&unit->refcount, 0);
+	init_waitqueue_head(&unit->remove_wq);
+
+	unit->port = port;
+	unit->fcp_lun = fcp_lun;
+
+	/* setup for sysfs registration */
+	snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
+	unit->sysfs_device.parent = &port->sysfs_device;
+	unit->sysfs_device.release = zfcp_sysfs_unit_release;
+	dev_set_drvdata(&unit->sysfs_device, unit);
+
+	/* mark unit unusable as long as sysfs registration is not complete */
+	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
+
+	if (device_register(&unit->sysfs_device)) {
+		kfree(unit);
+		return NULL;
+	}
+
+	if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
+		device_unregister(&unit->sysfs_device);
+		return NULL;
+	}
+
+	zfcp_unit_get(unit);
+
+	scsi_lun = 0;
+	found = 0;
+	write_lock_irq(&zfcp_data.config_lock);
+	list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
+		if (tmp_unit->scsi_lun != scsi_lun) {
+			found = 1;
+			break;
+		}
+		scsi_lun++;
+	}
+	unit->scsi_lun = scsi_lun;
+	if (found)
+		list_add_tail(&unit->list, &tmp_unit->list);
+	else
+		list_add_tail(&unit->list, &port->unit_list_head);
+	atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
+	atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
+	write_unlock_irq(&zfcp_data.config_lock);
+
+	port->units++;
+	zfcp_port_get(port);
+
+	return unit;
+}
+
+void
+zfcp_unit_dequeue(struct zfcp_unit *unit)
+{
+	zfcp_unit_wait(unit);
+	write_lock_irq(&zfcp_data.config_lock);
+	list_del(&unit->list);
+	write_unlock_irq(&zfcp_data.config_lock);
+	unit->port->units--;
+	zfcp_port_put(unit->port);
+	zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
+	device_unregister(&unit->sysfs_device);
+}
+
+static void *
+zfcp_mempool_alloc(unsigned int __nocast gfp_mask, void *size)
+{
+	return kmalloc((size_t) size, gfp_mask);
+}
+
+static void
+zfcp_mempool_free(void *element, void *size)
+{
+	kfree(element);
+}
+
+/*
+ * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
+ * commands.
+ * It also genrates fcp-nameserver request/response buffer and unsolicited 
+ * status read fsf_req buffers.
+ *
+ * locks:       must only be called with zfcp_data.config_sema taken
+ */
+static int
+zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
+{
+	adapter->pool.fsf_req_erp =
+		mempool_create(ZFCP_POOL_FSF_REQ_ERP_NR,
+			       zfcp_mempool_alloc, zfcp_mempool_free, (void *)
+			       sizeof(struct zfcp_fsf_req_pool_element));
+
+	if (NULL == adapter->pool.fsf_req_erp)
+		return -ENOMEM;
+
+	adapter->pool.fsf_req_scsi =
+		mempool_create(ZFCP_POOL_FSF_REQ_SCSI_NR,
+			       zfcp_mempool_alloc, zfcp_mempool_free, (void *)
+			       sizeof(struct zfcp_fsf_req_pool_element));
+
+	if (NULL == adapter->pool.fsf_req_scsi)
+		return -ENOMEM;
+
+	adapter->pool.fsf_req_abort =
+		mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
+			       zfcp_mempool_alloc, zfcp_mempool_free, (void *)
+			       sizeof(struct zfcp_fsf_req_pool_element));
+
+	if (NULL == adapter->pool.fsf_req_abort)
+		return -ENOMEM;
+
+	adapter->pool.fsf_req_status_read =
+		mempool_create(ZFCP_POOL_STATUS_READ_NR,
+			       zfcp_mempool_alloc, zfcp_mempool_free,
+			       (void *) sizeof(struct zfcp_fsf_req));
+
+	if (NULL == adapter->pool.fsf_req_status_read)
+		return -ENOMEM;
+
+	adapter->pool.data_status_read =
+		mempool_create(ZFCP_POOL_STATUS_READ_NR,
+			       zfcp_mempool_alloc, zfcp_mempool_free,
+			       (void *) sizeof(struct fsf_status_read_buffer));
+
+	if (NULL == adapter->pool.data_status_read)
+		return -ENOMEM;
+
+	adapter->pool.data_gid_pn =
+		mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
+			       zfcp_mempool_alloc, zfcp_mempool_free, (void *)
+			       sizeof(struct zfcp_gid_pn_data));
+
+	if (NULL == adapter->pool.data_gid_pn)
+		return -ENOMEM;
+
+	return 0;
+}
+
+/**
+ * zfcp_free_low_mem_buffers - free memory pools of an adapter
+ * @adapter: pointer to zfcp_adapter for which memory pools should be freed
+ * locking:  zfcp_data.config_sema must be held
+ */
+static void
+zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
+{
+	if (adapter->pool.fsf_req_erp)
+		mempool_destroy(adapter->pool.fsf_req_erp);
+	if (adapter->pool.fsf_req_scsi)
+		mempool_destroy(adapter->pool.fsf_req_scsi);
+	if (adapter->pool.fsf_req_abort)
+		mempool_destroy(adapter->pool.fsf_req_abort);
+	if (adapter->pool.fsf_req_status_read)
+		mempool_des