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!

1 files changed, 1722 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
new file mode 100644
index 00000000000..838aedf78a5
--- /dev/null
+++ b/drivers/s390/block/dasd_eckd.c
@@ -0,0 +1,1722 @@
+/* 
+ * File...........: linux/drivers/s390/block/dasd_eckd.c
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ *		    Horst Hummel <Horst.Hummel@de.ibm.com> 
+ *		    Carsten Otte <Cotte@de.ibm.com>
+ *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
+ *
+ * $Revision: 1.69 $
+ */
+
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/hdreg.h>	/* HDIO_GETGEO			    */
+#include <linux/bio.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <asm/debug.h>
+#include <asm/idals.h>
+#include <asm/ebcdic.h>
+#include <asm/io.h>
+#include <asm/todclk.h>
+#include <asm/uaccess.h>
+#include <asm/ccwdev.h>
+
+#include "dasd_int.h"
+#include "dasd_eckd.h"
+
+#ifdef PRINTK_HEADER
+#undef PRINTK_HEADER
+#endif				/* PRINTK_HEADER */
+#define PRINTK_HEADER "dasd(eckd):"
+
+#define ECKD_C0(i) (i->home_bytes)
+#define ECKD_F(i) (i->formula)
+#define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
+		    (i->factors.f_0x02.f1))
+#define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
+		    (i->factors.f_0x02.f2))
+#define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
+		    (i->factors.f_0x02.f3))
+#define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
+#define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
+#define ECKD_F6(i) (i->factor6)
+#define ECKD_F7(i) (i->factor7)
+#define ECKD_F8(i) (i->factor8)
+
+MODULE_LICENSE("GPL");
+
+static struct dasd_discipline dasd_eckd_discipline;
+
+struct dasd_eckd_private {
+	struct dasd_eckd_characteristics rdc_data;
+	struct dasd_eckd_confdata conf_data;
+	struct dasd_eckd_path path_data;
+	struct eckd_count count_area[5];
+	int init_cqr_status;
+	int uses_cdl;
+	struct attrib_data_t attrib;	/* e.g. cache operations */
+};
+
+/* The ccw bus type uses this table to find devices that it sends to
+ * dasd_eckd_probe */
+static struct ccw_device_id dasd_eckd_ids[] = {
+	{ CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), driver_info: 0x1},
+	{ CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), driver_info: 0x2},
+	{ CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), driver_info: 0x3},
+	{ CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), driver_info: 0x4},
+	{ CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), driver_info: 0x5},
+	{ CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), driver_info: 0x6},
+	{ CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), driver_info: 0x7},
+	{ CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), driver_info: 0x8},
+	{ CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), driver_info: 0x9},
+	{ CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), driver_info: 0xa},
+	{ /* end of list */ },
+};
+
+MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
+
+static struct ccw_driver dasd_eckd_driver; /* see below */
+
+/* initial attempt at a probe function. this can be simplified once
+ * the other detection code is gone */
+static int
+dasd_eckd_probe (struct ccw_device *cdev)
+{
+	int ret;
+
+	ret = dasd_generic_probe (cdev, &dasd_eckd_discipline);
+	if (ret)
+		return ret;
+	ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | CCWDEV_ALLOW_FORCE);
+	return 0;
+}
+
+static int
+dasd_eckd_set_online(struct ccw_device *cdev)
+{
+	return dasd_generic_set_online (cdev, &dasd_eckd_discipline);
+}
+
+static struct ccw_driver dasd_eckd_driver = {
+	.name        = "dasd-eckd",
+	.owner       = THIS_MODULE,
+	.ids         = dasd_eckd_ids,
+	.probe       = dasd_eckd_probe,
+	.remove      = dasd_generic_remove,
+	.set_offline = dasd_generic_set_offline,
+	.set_online  = dasd_eckd_set_online,
+	.notify      = dasd_generic_notify,
+};
+
+static const int sizes_trk0[] = { 28, 148, 84 };
+#define LABEL_SIZE 140
+
+static inline unsigned int
+round_up_multiple(unsigned int no, unsigned int mult)
+{
+	int rem = no % mult;
+	return (rem ? no - rem + mult : no);
+}
+
+static inline unsigned int
+ceil_quot(unsigned int d1, unsigned int d2)
+{
+	return (d1 + (d2 - 1)) / d2;
+}
+
+static inline int
+bytes_per_record(struct dasd_eckd_characteristics *rdc, int kl, int dl)
+{
+	unsigned int fl1, fl2, int1, int2;
+	int bpr;
+
+	switch (rdc->formula) {
+	case 0x01:
+		fl1 = round_up_multiple(ECKD_F2(rdc) + dl, ECKD_F1(rdc));
+		fl2 = round_up_multiple(kl ? ECKD_F2(rdc) + kl : 0,
+					ECKD_F1(rdc));
+		bpr = fl1 + fl2;
+		break;
+	case 0x02:
+		int1 = ceil_quot(dl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
+		int2 = ceil_quot(kl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
+		fl1 = round_up_multiple(ECKD_F1(rdc) * ECKD_F2(rdc) + dl +
+					ECKD_F6(rdc) + ECKD_F4(rdc) * int1,
+					ECKD_F1(rdc));
+		fl2 = round_up_multiple(ECKD_F1(rdc) * ECKD_F3(rdc) + kl +
+					ECKD_F6(rdc) + ECKD_F4(rdc) * int2,
+					ECKD_F1(rdc));
+		bpr = fl1 + fl2;
+		break;
+	default:
+		bpr = 0;
+		break;
+	}
+	return bpr;
+}
+
+static inline unsigned int
+bytes_per_track(struct dasd_eckd_characteristics *rdc)
+{
+	return *(unsigned int *) (rdc->byte_per_track) >> 8;
+}
+
+static inline unsigned int
+recs_per_track(struct dasd_eckd_characteristics * rdc,
+	       unsigned int kl, unsigned int dl)
+{
+	int dn, kn;
+
+	switch (rdc->dev_type) {
+	case 0x3380:
+		if (kl)
+			return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
+				       ceil_quot(dl + 12, 32));
+		else
+			return 1499 / (15 + ceil_quot(dl + 12, 32));
+	case 0x3390:
+		dn = ceil_quot(dl + 6, 232) + 1;
+		if (kl) {
+			kn = ceil_quot(kl + 6, 232) + 1;
+			return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
+				       9 + ceil_quot(dl + 6 * dn, 34));
+		} else
+			return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
+	case 0x9345:
+		dn = ceil_quot(dl + 6, 232) + 1;
+		if (kl) {
+			kn = ceil_quot(kl + 6, 232) + 1;
+			return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
+				       ceil_quot(dl + 6 * dn, 34));
+		} else
+			return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
+	}
+	return 0;
+}
+
+static inline void
+check_XRC (struct ccw1         *de_ccw,
+           struct DE_eckd_data *data,
+           struct dasd_device  *device)
+{
+        struct dasd_eckd_private *private;
+
+        private = (struct dasd_eckd_private *) device->private;
+
+        /* switch on System Time Stamp - needed for XRC Support */
+        if (private->rdc_data.facilities.XRC_supported) {
+                
+                data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
+                data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
+                
+                data->ep_sys_time = get_clock ();
+                
+                de_ccw->count = sizeof (struct DE_eckd_data);
+                de_ccw->flags |= CCW_FLAG_SLI;  
+        }
+
+        return;
+
+} /* end check_XRC */
+
+static inline void
+define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
+	      int totrk, int cmd, struct dasd_device * device)
+{
+	struct dasd_eckd_private *private;
+	struct ch_t geo, beg, end;
+
+	private = (struct dasd_eckd_private *) device->private;
+
+	ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
+	ccw->flags = 0;
+	ccw->count = 16;
+	ccw->cda = (__u32) __pa(data);
+
+	memset(data, 0, sizeof (struct DE_eckd_data));
+	switch (cmd) {
+	case DASD_ECKD_CCW_READ_HOME_ADDRESS:
+	case DASD_ECKD_CCW_READ_RECORD_ZERO:
+	case DASD_ECKD_CCW_READ:
+	case DASD_ECKD_CCW_READ_MT:
+	case DASD_ECKD_CCW_READ_CKD:
+	case DASD_ECKD_CCW_READ_CKD_MT:
+	case DASD_ECKD_CCW_READ_KD:
+	case DASD_ECKD_CCW_READ_KD_MT:
+	case DASD_ECKD_CCW_READ_COUNT:
+		data->mask.perm = 0x1;
+		data->attributes.operation = private->attrib.operation;
+		break;
+	case DASD_ECKD_CCW_WRITE:
+	case DASD_ECKD_CCW_WRITE_MT:
+	case DASD_ECKD_CCW_WRITE_KD:
+	case DASD_ECKD_CCW_WRITE_KD_MT:
+		data->mask.perm = 0x02;
+		data->attributes.operation = private->attrib.operation;
+                check_XRC (ccw, data, device);
+		break;
+	case DASD_ECKD_CCW_WRITE_CKD:
+	case DASD_ECKD_CCW_WRITE_CKD_MT:
+		data->attributes.operation = DASD_BYPASS_CACHE;
+                check_XRC (ccw, data, device);
+		break;
+	case DASD_ECKD_CCW_ERASE:
+	case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
+	case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
+		data->mask.perm = 0x3;
+		data->mask.auth = 0x1;
+		data->attributes.operation = DASD_BYPASS_CACHE;
+                check_XRC (ccw, data, device);
+		break;
+	default:
+		DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
+		break;
+	}
+
+	data->attributes.mode = 0x3;	/* ECKD */
+
+	if ((private->rdc_data.cu_type == 0x2105 ||
+	     private->rdc_data.cu_type == 0x2107 ||
+	     private->rdc_data.cu_type == 0x1750)
+	    && !(private->uses_cdl && trk < 2))
+		data->ga_extended |= 0x40; /* Regular Data Format Mode */
+
+	geo.cyl = private->rdc_data.no_cyl;
+	geo.head = private->rdc_data.trk_per_cyl;
+	beg.cyl = trk / geo.head;
+	beg.head = trk % geo.head;
+	end.cyl = totrk / geo.head;
+	end.head = totrk % geo.head;
+
+	/* check for sequential prestage - enhance cylinder range */
+	if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
+	    data->attributes.operation == DASD_SEQ_ACCESS) {
+		
+		if (end.cyl + private->attrib.nr_cyl < geo.cyl) 
+			end.cyl += private->attrib.nr_cyl;
+		else
+			end.cyl = (geo.cyl - 1);
+	}
+
+	data->beg_ext.cyl = beg.cyl;
+	data->beg_ext.head = beg.head;
+	data->end_ext.cyl = end.cyl;
+	data->end_ext.head = end.head;
+}
+
+static inline void
+locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
+	      int rec_on_trk, int no_rec, int cmd,
+	      struct dasd_device * device, int reclen)
+{
+	struct dasd_eckd_private *private;
+	int sector;
+	int dn, d;
+				
+	private = (struct dasd_eckd_private *) device->private;
+
+	DBF_DEV_EVENT(DBF_INFO, device,
+		  "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
+		  trk, rec_on_trk, no_rec, cmd, reclen);
+
+	ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
+	ccw->flags = 0;
+	ccw->count = 16;
+	ccw->cda = (__u32) __pa(data);
+
+	memset(data, 0, sizeof (struct LO_eckd_data));
+	sector = 0;
+	if (rec_on_trk) {
+		switch (private->rdc_data.dev_type) {
+		case 0x3390:
+			dn = ceil_quot(reclen + 6, 232);
+			d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
+			sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
+			break;
+		case 0x3380:
+			d = 7 + ceil_quot(reclen + 12, 32);
+			sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
+			break;
+		}
+	}
+	data->sector = sector;
+	data->count = no_rec;
+	switch (cmd) {
+	case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
+		data->operation.orientation = 0x3;
+		data->operation.operation = 0x03;
+		break;
+	case DASD_ECKD_CCW_READ_HOME_ADDRESS:
+		data->operation.orientation = 0x3;
+		data->operation.operation = 0x16;
+		break;
+	case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
+		data->operation.orientation = 0x1;
+		data->operation.operation = 0x03;
+		data->count++;
+		break;
+	case DASD_ECKD_CCW_READ_RECORD_ZERO:
+		data->operation.orientation = 0x3;
+		data->operation.operation = 0x16;
+		data->count++;
+		break;
+	case DASD_ECKD_CCW_WRITE:
+	case DASD_ECKD_CCW_WRITE_MT:
+	case DASD_ECKD_CCW_WRITE_KD:
+	case DASD_ECKD_CCW_WRITE_KD_MT:
+		data->auxiliary.last_bytes_used = 0x1;
+		data->length = reclen;
+		data->operation.operation = 0x01;
+		break;
+	case DASD_ECKD_CCW_WRITE_CKD:
+	case DASD_ECKD_CCW_WRITE_CKD_MT:
+		data->auxiliary.last_bytes_used = 0x1;
+		data->length = reclen;
+		data->operation.operation = 0x03;
+		break;
+	case DASD_ECKD_CCW_READ:
+	case DASD_ECKD_CCW_READ_MT:
+	case DASD_ECKD_CCW_READ_KD:
+	case DASD_ECKD_CCW_READ_KD_MT:
+		data->auxiliary.last_bytes_used = 0x1;
+		data->length = reclen;
+		data->operation.operation = 0x06;
+		break;
+	case DASD_ECKD_CCW_READ_CKD:
+	case DASD_ECKD_CCW_READ_CKD_MT:
+		data->auxiliary.last_bytes_used = 0x1;
+		data->length = reclen;
+		data->operation.operation = 0x16;
+		break;
+	case DASD_ECKD_CCW_READ_COUNT:
+		data->operation.operation = 0x06;
+		break;
+	case DASD_ECKD_CCW_ERASE:
+		data->length = reclen;
+		data->auxiliary.last_bytes_used = 0x1;
+		data->operation.operation = 0x0b;
+		break;
+	default:
+		DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
+	}
+	data->seek_addr.cyl = data->search_arg.cyl =
+		trk / private->rdc_data.trk_per_cyl;
+	data->seek_addr.head = data->search_arg.head =
+		trk % private->rdc_data.trk_per_cyl;
+	data->search_arg.record = rec_on_trk;
+}
+
+/*
+ * Returns 1 if the block is one of the special blocks that needs
+ * to get read/written with the KD variant of the command.
+ * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
+ * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
+ * Luckily the KD variants differ only by one bit (0x08) from the
+ * normal variant. So don't wonder about code like:
+ * if (dasd_eckd_cdl_special(blk_per_trk, recid))
+ *         ccw->cmd_code |= 0x8;
+ */
+static inline int
+dasd_eckd_cdl_special(int blk_per_trk, int recid)
+{
+	if (recid < 3)
+		return 1;
+	if (recid < blk_per_trk)
+		return 0;
+	if (recid < 2 * blk_per_trk)
+		return 1;
+	return 0;
+}
+
+/*
+ * Returns the record size for the special blocks of the cdl format.
+ * Only returns something useful if dasd_eckd_cdl_special is true
+ * for the recid.
+ */
+static inline int
+dasd_eckd_cdl_reclen(int recid)
+{
+	if (recid < 3)
+		return sizes_trk0[recid];
+	return LABEL_SIZE;
+}
+
+static int
+dasd_eckd_read_conf(struct dasd_device *device)
+{
+	void *conf_data;
+	int conf_len, conf_data_saved;
+	int rc;
+	__u8 lpm;
+	struct dasd_eckd_private *private;
+	struct dasd_eckd_path *path_data;
+
+	private = (struct dasd_eckd_private *) device->private;
+	path_data = (struct dasd_eckd_path *) &private->path_data;
+	path_data->opm = ccw_device_get_path_mask(device->cdev);
+	lpm = 0x80;
+	conf_data_saved = 0;
+
+	/* get configuration data per operational path */
+	for (lpm = 0x80; lpm; lpm>>= 1) {
+		if (lpm & path_data->opm){
+			rc = read_conf_data_lpm(device->cdev, &conf_data,
+						&conf_len, lpm);
+			if (rc && rc != -EOPNOTSUPP) {	/* -EOPNOTSUPP is ok */
+				MESSAGE(KERN_WARNING,
+					"Read configuration data returned "
+					"error %d", rc);
+				return rc;
+			}
+			if (conf_data == NULL) {
+				MESSAGE(KERN_WARNING, "%s", "No configuration "
+					"data retrieved");
+				continue;	/* no errror */
+			}
+			if (conf_len != sizeof (struct dasd_eckd_confdata)) {
+				MESSAGE(KERN_WARNING,
+					"sizes of configuration data mismatch"
+					"%d (read) vs %ld (expected)",
+					conf_len,
+					sizeof (struct dasd_eckd_confdata));
+				kfree(conf_data);
+				continue;	/* no errror */
+			}
+			/* save first valid configuration data */
+			if (!conf_data_saved){
+				memcpy(&private->conf_data, conf_data,
+				       sizeof (struct dasd_eckd_confdata));
+				conf_data_saved++;
+			}
+			switch (((char *)conf_data)[242] & 0x07){
+			case 0x02:
+				path_data->npm |= lpm;
+				break;
+			case 0x03:
+				path_data->ppm |= lpm;
+				break;
+			}
+			kfree(conf_data);
+		}
+	}
+	return 0;
+}
+
+
+static int
+dasd_eckd_check_characteristics(struct dasd_device *device)
+{
+	struct dasd_eckd_private *private;
+	void *rdc_data;
+	int rc;
+
+	private = (struct dasd_eckd_private *) device->private;
+	if (private == NULL) {
+		private = kmalloc(sizeof(struct dasd_eckd_private),
+				  GFP_KERNEL | GFP_DMA);
+		if (private == NULL) {
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "memory allocation failed for private "
+				    "data");
+			return -ENOMEM;
+		}
+		memset(private, 0, sizeof(struct dasd_eckd_private));
+		device->private = (void *) private;
+	}
+	/* Invalidate status of initial analysis. */
+	private->init_cqr_status = -1;
+	/* Set default cache operations. */
+	private->attrib.operation = DASD_NORMAL_CACHE;
+	private->attrib.nr_cyl = 0;
+
+	/* Read Device Characteristics */
+	rdc_data = (void *) &(private->rdc_data);
+	rc = read_dev_chars(device->cdev, &rdc_data, 64);
+	if (rc) {
+		DEV_MESSAGE(KERN_WARNING, device,
+			    "Read device characteristics returned error %d",
+			    rc);
+		return rc;
+	}
+
+	DEV_MESSAGE(KERN_INFO, device,
+		    "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
+		    private->rdc_data.dev_type,
+		    private->rdc_data.dev_model,
+		    private->rdc_data.cu_type,
+		    private->rdc_data.cu_model.model,
+		    private->rdc_data.no_cyl,
+		    private->rdc_data.trk_per_cyl,
+		    private->rdc_data.sec_per_trk);
+
+	/* Read Configuration Data */
+	rc = dasd_eckd_read_conf (device);
+	return rc;
+
+}
+
+static struct dasd_ccw_req *
+dasd_eckd_analysis_ccw(struct dasd_device *device)
+{
+	struct dasd_eckd_private *private;
+	struct eckd_count *count_data;
+	struct LO_eckd_data *LO_data;
+	struct dasd_ccw_req *cqr;
+	struct ccw1 *ccw;
+	int cplength, datasize;
+	int i;
+
+	private = (struct dasd_eckd_private *) device->private;
+
+	cplength = 8;
+	datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
+	cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
+				   cplength, datasize, device);
+	if (IS_ERR(cqr))
+		return cqr;
+	ccw = cqr->cpaddr;
+	/* Define extent for the first 3 tracks. */
+	define_extent(ccw++, cqr->data, 0, 2,
+		      DASD_ECKD_CCW_READ_COUNT, device);
+	LO_data = cqr->data + sizeof (struct DE_eckd_data);
+	/* Locate record for the first 4 records on track 0. */
+	ccw[-1].flags |= CCW_FLAG_CC;
+	locate_record(ccw++, LO_data++, 0, 0, 4,
+		      DASD_ECKD_CCW_READ_COUNT, device, 0);
+
+	count_data = private->count_area;
+	for (i = 0; i < 4; i++) {
+		ccw[-1].flags |= CCW_FLAG_CC;
+		ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
+		ccw->flags = 0;
+		ccw->count = 8;
+		ccw->cda = (__u32)(addr_t) count_data;
+		ccw++;
+		count_data++;
+	}
+
+	/* Locate record for the first record on track 2. */
+	ccw[-1].flags |= CCW_FLAG_CC;
+	locate_record(ccw++, LO_data++, 2, 0, 1,
+		      DASD_ECKD_CCW_READ_COUNT, device, 0);
+	/* Read count ccw. */
+	ccw[-1].flags |= CCW_FLAG_CC;
+	ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
+	ccw->flags = 0;
+	ccw->count = 8;
+	ccw->cda = (__u32)(addr_t) count_data;
+
+	cqr->device = device;
+	cqr->retries = 0;
+	cqr->buildclk = get_clock();
+	cqr->status = DASD_CQR_FILLED;
+	return cqr;
+}
+
+/*
+ * This is the callback function for the init_analysis cqr. It saves
+ * the status of the initial analysis ccw before it frees it and kicks
+ * the device to continue the startup sequence. This will call
+ * dasd_eckd_do_analysis again (if the devices has not been marked
+ * for deletion in the meantime).
+ */
+static void
+dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
+{
+	struct dasd_eckd_private *private;
+	struct dasd_device *device;
+
+	device = init_cqr->device;
+	private = (struct dasd_eckd_private *) device->private;
+	private->init_cqr_status = init_cqr->status;
+	dasd_sfree_request(init_cqr, device);
+	dasd_kick_device(device);
+}
+
+static int
+dasd_eckd_start_analysis(struct dasd_device *device)
+{
+	struct dasd_eckd_private *private;
+	struct dasd_ccw_req *init_cqr;
+
+	private = (struct dasd_eckd_private *) device->private;
+	init_cqr = dasd_eckd_analysis_ccw(device);
+	if (IS_ERR(init_cqr))
+		return PTR_ERR(init_cqr);
+	init_cqr->callback = dasd_eckd_analysis_callback;
+	init_cqr->callback_data = NULL;
+	init_cqr->expires = 5*HZ;
+	dasd_add_request_head(init_cqr);
+	return -EAGAIN;
+}
+
+static int
+dasd_eckd_end_analysis(struct dasd_device *device)
+{
+	struct dasd_eckd_private *private;
+	struct eckd_count *count_area;
+	unsigned int sb, blk_per_trk;
+	int status, i;
+
+	private = (struct dasd_eckd_private *) device->private;
+	status = private->init_cqr_status;
+	private->init_cqr_status = -1;
+	if (status != DASD_CQR_DONE) {
+		DEV_MESSAGE(KERN_WARNING, device, "%s",
+			    "volume analysis returned unformatted disk");
+		return -EMEDIUMTYPE;
+	}
+
+	private->uses_cdl = 1;
+	/* Calculate number of blocks/records per track. */
+	blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
+	/* Check Track 0 for Compatible Disk Layout */
+	count_area = NULL;
+	for (i = 0; i < 3; i++) {
+		if (private->count_area[i].kl != 4 ||
+		    private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
+			private->uses_cdl = 0;
+			break;
+		}
+	}
+	if (i == 3)
+		count_area = &private->count_area[4];
+
+	if (private->uses_cdl == 0) {
+		for (i = 0; i < 5; i++) {
+			if ((private->count_area[i].kl != 0) ||
+			    (private->count_area[i].dl !=
+			     private->count_area[0].dl))
+				break;
+		}
+		if (i == 5)
+			count_area = &private->count_area[0];
+	} else {
+		if (private->count_area[3].record == 1)
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "Trk 0: no records after VTOC!");
+	}
+	if (count_area != NULL && count_area->kl == 0) {
+		/* we found notthing violating our disk layout */
+		if (dasd_check_blocksize(count_area->dl) == 0)
+			device->bp_block = count_area->dl;
+	}
+	if (device->bp_block == 0) {
+		DEV_MESSAGE(KERN_WARNING, device, "%s",
+			    "Volume has incompatible disk layout");
+		return -EMEDIUMTYPE;
+	}
+	device->s2b_shift = 0;	/* bits to shift 512 to get a block */
+	for (sb = 512; sb < device->bp_block; sb = sb << 1)
+		device->s2b_shift++;
+
+	blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
+	device->blocks = (private->rdc_data.no_cyl *
+			  private->rdc_data.trk_per_cyl *
+			  blk_per_trk);
+
+	DEV_MESSAGE(KERN_INFO, device,
+		    "(%dkB blks): %dkB at %dkB/trk %s",
+		    (device->bp_block >> 10),
+		    ((private->rdc_data.no_cyl *
+		      private->rdc_data.trk_per_cyl *
+		      blk_per_trk * (device->bp_block >> 9)) >> 1),
+		    ((blk_per_trk * device->bp_block) >> 10), 
+		    private->uses_cdl ?
+		    "compatible disk layout" : "linux disk layout");
+
+	return 0;
+}
+
+static int
+dasd_eckd_do_analysis(struct dasd_device *device)
+{
+	struct dasd_eckd_private *private;
+
+	private = (struct dasd_eckd_private *) device->private;
+	if (private->init_cqr_status < 0)
+		return dasd_eckd_start_analysis(device);
+	else
+		return dasd_eckd_end_analysis(device);
+}
+
+static int
+dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
+{
+	struct dasd_eckd_private *private;
+
+	private = (struct dasd_eckd_private *) device->private;
+	if (dasd_check_blocksize(device->bp_block) == 0) {
+		geo->sectors = recs_per_track(&private->rdc_data,
+					      0, device->bp_block);
+	}
+	geo->cylinders = private->rdc_data.no_cyl;
+	geo->heads = private->rdc_data.trk_per_cyl;
+	return 0;
+}
+
+static struct dasd_ccw_req *
+dasd_eckd_format_device(struct dasd_device * device,
+			struct format_data_t * fdata)
+{
+	struct dasd_eckd_private *private;
+	struct dasd_ccw_req *fcp;
+	struct eckd_count *ect;
+	struct ccw1 *ccw;
+	void *data;
+	int rpt, cyl, head;
+	int cplength, datasize;
+	int i;
+
+	private = (struct dasd_eckd_private *) device->private;
+	rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
+	cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
+	head = fdata->start_unit % private->rdc_data.trk_per_cyl;
+
+	/* Sanity checks. */
+	if (fdata->start_unit >=
+	    (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
+		DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
+			    fdata->start_unit);
+		return ERR_PTR(-EINVAL);
+	}
+	if (fdata->start_unit > fdata->stop_unit) {
+		DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
+			    fdata->start_unit);
+		return ERR_PTR(-EINVAL);
+	}
+	if (dasd_check_blocksize(fdata->blksize) != 0) {
+		DEV_MESSAGE(KERN_WARNING, device,
+			    "Invalid blocksize %d...terminating!",
+			    fdata->blksize);
+		return ERR_PTR(-EINVAL);
+	}
+
+	/*
+	 * fdata->intensity is a bit string that tells us what to do:
+	 *   Bit 0: write record zero
+	 *   Bit 1: write home address, currently not supported
+	 *   Bit 2: invalidate tracks
+	 *   Bit 3: use OS/390 compatible disk layout (cdl)
+	 * Only some bit combinations do make sense.
+	 */
+	switch (fdata->intensity) {
+	case 0x00:	/* Normal format */
+	case 0x08:	/* Normal format, use cdl. */
+		cplength = 2 + rpt;
+		datasize = sizeof(struct DE_eckd_data) +
+			sizeof(struct LO_eckd_data) +
+			rpt * sizeof(struct eckd_count);
+		break;
+	case 0x01:	/* Write record zero and format track. */
+	case 0x09:	/* Write record zero and format track, use cdl. */
+		cplength = 3 + rpt;
+		datasize = sizeof(struct DE_eckd_data) +
+			sizeof(struct LO_eckd_data) +
+			sizeof(struct eckd_count) +
+			rpt * sizeof(struct eckd_count);
+		break;
+	case 0x04:	/* Invalidate track. */
+	case 0x0c:	/* Invalidate track, use cdl. */
+		cplength = 3;
+		datasize = sizeof(struct DE_eckd_data) +
+			sizeof(struct LO_eckd_data) +
+			sizeof(struct eckd_count);
+		break;
+	default:
+		DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
+			    fdata->intensity);
+		return ERR_PTR(-EINVAL);
+	}
+	/* Allocate the format ccw request. */
+	fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
+				   cplength, datasize, device);
+	if (IS_ERR(fcp))
+		return fcp;
+
+	data = fcp->data;
+	ccw = fcp->cpaddr;
+
+	switch (fdata->intensity & ~0x08) {
+	case 0x00: /* Normal format. */
+		define_extent(ccw++, (struct DE_eckd_data *) data,
+			      fdata->start_unit, fdata->start_unit,
+			      DASD_ECKD_CCW_WRITE_CKD, device);
+		data += sizeof(struct DE_eckd_data);
+		ccw[-1].flags |= CCW_FLAG_CC;
+		locate_record(ccw++, (struct LO_eckd_data *) data,
+			      fdata->start_unit, 0, rpt,
+			      DASD_ECKD_CCW_WRITE_CKD, device,
+			      fdata->blksize);
+		data += sizeof(struct LO_eckd_data);
+		break;
+	case 0x01: /* Write record zero + format track. */
+		define_extent(ccw++, (struct DE_eckd_data *) data,
+			      fdata->start_unit, fdata->start_unit,
+			      DASD_ECKD_CCW_WRITE_RECORD_ZERO,
+			      device);
+		data += sizeof(struct DE_eckd_data);
+		ccw[-1].flags |= CCW_FLAG_CC;
+		locate_record(ccw++, (struct LO_eckd_data *) data,
+			      fdata->start_unit, 0, rpt + 1,
+			      DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
+			      device->bp_block);
+		data += sizeof(struct LO_eckd_data);
+		break;
+	case 0x04: /* Invalidate track. */
+		define_extent(ccw++, (struct DE_eckd_data *) data,
+			      fdata->start_unit, fdata->start_unit,
+			      DASD_ECKD_CCW_WRITE_CKD, device);
+		data += sizeof(struct DE_eckd_data);
+		ccw[-1].flags |= CCW_FLAG_CC;
+		locate_record(ccw++, (struct LO_eckd_data *) data,
+			      fdata->start_unit, 0, 1,
+			      DASD_ECKD_CCW_WRITE_CKD, device, 8);
+		data += sizeof(struct LO_eckd_data);
+		break;
+	}
+	if (fdata->intensity & 0x01) {	/* write record zero */
+		ect = (struct eckd_count *) data;
+		data += sizeof(struct eckd_count);
+		ect->cyl = cyl;
+		ect->head = head;
+		ect->record = 0;
+		ect->kl = 0;
+		ect->dl = 8;
+		ccw[-1].flags |= CCW_FLAG_CC;
+		ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
+		ccw->flags = CCW_FLAG_SLI;
+		ccw->count = 8;
+		ccw->cda = (__u32)(addr_t) ect;
+		ccw++;
+	}
+	if ((fdata->intensity & ~0x08) & 0x04) {	/* erase track */
+		ect = (struct eckd_count *) data;
+		data += sizeof(struct eckd_count);
+		ect->cyl = cyl;
+		ect->head = head;
+		ect->record = 1;
+		ect->kl = 0;
+		ect->dl = 0;
+		ccw[-1].flags |= CCW_FLAG_CC;
+		ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
+		ccw->flags = CCW_FLAG_SLI;
+		ccw->count = 8;
+		ccw->cda = (__u32)(addr_t) ect;
+	} else {		/* write remaining records */
+		for (i = 0; i < rpt; i++) {
+			ect = (struct eckd_count *) data;
+			data += sizeof(struct eckd_count);
+			ect->cyl = cyl;
+			ect->head = head;
+			ect->record = i + 1;
+			ect->kl = 0;
+			ect->dl = fdata->blksize;
+			/* Check for special tracks 0-1 when formatting CDL */
+			if ((fdata->intensity & 0x08) &&
+			    fdata->start_unit == 0) {
+				if (i < 3) {
+					ect->kl = 4;
+					ect->dl = sizes_trk0[i] - 4;
+				} 
+			}
+			if ((fdata->intensity & 0x08) &&
+			    fdata->start_unit == 1) {
+				ect->kl = 44;
+				ect->dl = LABEL_SIZE - 44;
+			}
+			ccw[-1].flags |= CCW_FLAG_CC;
+			ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
+			ccw->flags = CCW_FLAG_SLI;
+			ccw->count = 8;
+			ccw->cda = (__u32)(addr_t) ect;
+			ccw++;
+		}
+	}
+	fcp->device = device;
+	fcp->retries = 2;	/* set retry counter to enable ERP */
+	fcp->buildclk = get_clock();
+	fcp->status = DASD_CQR_FILLED;
+	return fcp;
+}
+
+static dasd_era_t
+dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
+{
+	struct dasd_device *device = (struct dasd_device *) cqr->device;
+	struct ccw_device *cdev = device->cdev;
+
+	if (irb->scsw.cstat == 0x00 &&
+	    irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
+		return dasd_era_none;
+
+	switch (cdev->id.cu_type) {
+	case 0x3990:
+	case 0x2105:
+	case 0x2107:
+	case 0x1750:
+		return dasd_3990_erp_examine(cqr, irb);
+	case 0x9343:
+		return dasd_9343_erp_examine(cqr, irb);
+	case 0x3880:
+	default:
+		DEV_MESSAGE(KERN_WARNING, device, "%s",
+			    "default (unknown CU type) - RECOVERABLE return");
+		return dasd_era_recover;
+	}
+}
+
+static dasd_erp_fn_t
+dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
+{
+	struct dasd_device *device = (struct dasd_device *) cqr->device;
+	struct ccw_device *cdev = device->cdev;
+
+	switch (cdev->id.cu_type) {
+	case 0x3990:
+	case 0x2105:
+	case 0x2107:
+	case 0x1750:
+		return dasd_3990_erp_action;
+	case 0x9343:
+	case 0x3880:
+	default:
+		return dasd_default_erp_action;
+	}
+}
+
+static dasd_erp_fn_t
+dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
+{
+	return dasd_default_erp_postaction;
+}
+
+static struct dasd_ccw_req *
+dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
+{
+	struct dasd_eckd_private *private;
+	unsigned long *idaws;
+	struct LO_eckd_data *LO_data;
+	struct dasd_ccw_req *cqr;
+	struct ccw1 *ccw;
+	struct bio *bio;
+	struct bio_vec *bv;
+	char *dst;
+	unsigned int blksize, blk_per_trk, off;
+	int count, cidaw, cplength, datasize;
+	sector_t recid, first_rec, last_rec;
+	sector_t first_trk, last_trk;
+	unsigned int first_offs, last_offs;
+	unsigned char cmd, rcmd;
+	int i;
+
+	private = (struct dasd_eckd_private *) device->private;
+	if (rq_data_dir(req) == READ)
+		cmd = DASD_ECKD_CCW_READ_MT;
+	else if (rq_data_dir(req) == WRITE)
+		cmd = DASD_ECKD_CCW_WRITE_MT;
+	else
+		return ERR_PTR(-EINVAL);
+	/* Calculate number of blocks/records per track. */
+	blksize = device->bp_block;
+	blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
+	/* Calculate record id of first and last block. */
+	first_rec = first_trk = req->sector >> device->s2b_shift;
+	first_offs = sector_div(first_trk, blk_per_trk);
+	last_rec = last_trk =
+		(req->sector + req->nr_sectors - 1) >> device->s2b_shift;
+	last_offs = sector_div(last_trk, blk_per_trk);
+	/* Check struct bio and count the number of blocks for the request. */
+	count = 0;
+	cidaw = 0;
+	rq_for_each_bio(bio, req) {
+		bio_for_each_segment(bv, bio, i) {
+			if (bv->bv_len & (blksize - 1))
+				/* Eckd can only do full blocks. */
+				return ERR_PTR(-EINVAL);
+			count += bv->bv_len >> (device->s2b_shift + 9);
+#if defined(CONFIG_ARCH_S390X)
+			if (idal_is_needed (page_address(bv->bv_page),
+					    bv->bv_len))
+				cidaw += bv->bv_len >> (device->s2b_shift + 9);
+#endif
+		}
+	}
+	/* Paranoia. */
+	if (count != last_rec - first_rec + 1)
+		return ERR_PTR(-EINVAL);
+	/* 1x define extent + 1x locate record + number of blocks */
+	cplength = 2 + count;
+	/* 1x define extent + 1x locate record + cidaws*sizeof(long) */
+	datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
+		cidaw * sizeof(unsigned long);
+	/* Find out the number of additional locate record ccws for cdl. */
+	if (private->uses_cdl && first_rec < 2*blk_per_trk) {
+		if (last_rec >= 2*blk_per_trk)
+			count = 2*blk_per_trk - first_rec;
+		cplength += count;
+		datasize += count*sizeof(struct LO_eckd_data);
+	}
+	/* Allocate the ccw request. */
+	cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
+				   cplength, datasize, device);
+	if (IS_ERR(cqr))
+		return cqr;
+	ccw = cqr->cpaddr;
+	/* First ccw is define extent. */
+	define_extent(ccw++, cqr->data, first_trk, last_trk, cmd, device);
+	/* Build locate_record+read/write/ccws. */
+	idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
+	LO_data = (struct LO_eckd_data *) (idaws + cidaw);
+	recid = first_rec;
+	if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
+		/* Only standard blocks so there is just one locate record. */
+		ccw[-1].flags |= CCW_FLAG_CC;
+		locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
+			      last_rec - recid + 1, cmd, device, blksize);
+	}
+	rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
+		dst = page_address(bv->bv_page) + bv->bv_offset;
+		if (dasd_page_cache) {
+			char *copy = kmem_cache_alloc(dasd_page_cache,
+						      SLAB_DMA | __GFP_NOWARN);
+			if (copy && rq_data_dir(req) == WRITE)
+				memcpy(copy + bv->bv_offset, dst, bv->bv_len);
+			if (copy)
+				dst = copy + bv->bv_offset;
+		}
+		for (off = 0; off < bv->bv_len; off += blksize) {
+			sector_t trkid = recid;
+			unsigned int recoffs = sector_div(trkid, blk_per_trk);
+			rcmd = cmd;
+			count = blksize;
+			/* Locate record for cdl special block ? */
+			if (private->uses_cdl && recid < 2*blk_per_trk) {
+				if (dasd_eckd_cdl_special(blk_per_trk, recid)){
+					rcmd |= 0x8;
+					count = dasd_eckd_cdl_reclen(recid);
+					if (count < blksize)
+						memset(dst + count, 0xe5,
+						       blksize - count);
+				}
+				ccw[-1].flags |= CCW_FLAG_CC;
+				locate_record(ccw++, LO_data++,
+					      trkid, recoffs + 1,
+					      1, rcmd, device, count);
+			}
+			/* Locate record for standard blocks ? */
+			if (private->uses_cdl && recid == 2*blk_per_trk) {
+				ccw[-1].flags |= CCW_FLAG_CC;
+				locate_record(ccw++, LO_data++,
+					      trkid, recoffs + 1,
+					      last_rec - recid + 1,
+					      cmd, device, count);
+			}
+			/* Read/write ccw. */
+			ccw[-1].flags |= CCW_FLAG_CC;
+			ccw->cmd_code = rcmd;
+			ccw->count = count;
+			if (idal_is_needed(dst, blksize)) {
+				ccw->cda = (__u32)(addr_t) idaws;
+				ccw->flags = CCW_FLAG_IDA;
+				idaws = idal_create_words(idaws, dst, blksize);
+			} else {
+				ccw->cda = (__u32)(addr_t) dst;
+				ccw->flags = 0;
+			}
+			ccw++;
+			dst += blksize;
+			recid++;
+		}
+	}
+	cqr->device = device;
+	cqr->expires = 5 * 60 * HZ;	/* 5 minutes */
+	cqr->lpm = private->path_data.ppm;
+	cqr->retries = 256;
+	cqr->buildclk = get_clock();
+	cqr->status = DASD_CQR_FILLED;
+	return cqr;
+}
+
+static int
+dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
+{
+	struct dasd_eckd_private *private;
+	struct ccw1 *ccw;
+	struct bio *bio;
+	struct bio_vec *bv;
+	char *dst, *cda;
+	unsigned int blksize, blk_per_trk, off;
+	sector_t recid;
+	int i, status;
+
+	if (!dasd_page_cache)
+		goto out;
+	private = (struct dasd_eckd_private *) cqr->device->private;
+	blksize = cqr->device->bp_block;
+	blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
+	recid = req->sector >> cqr->device->s2b_shift;
+	ccw = cqr->cpaddr;
+	/* Skip over define extent & locate record. */
+	ccw++;
+	if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
+		ccw++;
+	rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
+		dst = page_address(bv->bv_page) + bv->bv_offset;
+		for (off = 0; off < bv->bv_len; off += blksize) {
+			/* Skip locate record. */
+			if (private->uses_cdl && recid <= 2*blk_per_trk)
+				ccw++;
+			if (dst) {
+				if (ccw->flags & CCW_FLAG_IDA)
+					cda = *((char **)((addr_t) ccw->cda));
+				else
+					cda = (char *)((addr_t) ccw->cda);
+				if (dst != cda) {
+					if (rq_data_dir(req) == READ)
+						memcpy(dst, cda, bv->bv_len);
+					kmem_cache_free(dasd_page_cache,
+					    (void *)((addr_t)cda & PAGE_MASK));
+				}
+				dst = NULL;
+			}
+			ccw++;
+			recid++;
+		}
+	}
+out:
+	status = cqr->status == DASD_CQR_DONE;
+	dasd_sfree_request(cqr, cqr->device);
+	return status;
+}
+
+static int
+dasd_eckd_fill_info(struct dasd_device * device,
+		    struct dasd_information2_t * info)
+{
+	struct dasd_eckd_private *private;
+
+	private = (struct dasd_eckd_private *) device->private;
+	info->label_block = 2;
+	info->FBA_layout = private->uses_cdl ? 0 : 1;
+	info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
+	info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
+	memcpy(info->characteristics, &private->rdc_data,
+	       sizeof(struct dasd_eckd_characteristics));
+	info->confdata_size = sizeof (struct dasd_eckd_confdata);
+	memcpy(info->configuration_data, &private->conf_data,
+	       sizeof (struct dasd_eckd_confdata));
+	return 0;
+}
+
+/*
+ * SECTION: ioctl functions for eckd devices.
+ */
+
+/*
+ * Release device ioctl.
+ * Buils a channel programm to releases a prior reserved 
+ * (see dasd_eckd_reserve) device.
+ */
+static int
+dasd_eckd_release(struct block_device *bdev, int no, long args)
+{
+	struct dasd_device *device;
+	struct dasd_ccw_req *cqr;
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	device = bdev->bd_disk->private_data;
+	if (device == NULL)
+		return -ENODEV;
+
+	cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
+				   1, 32, device);
+	if (IS_ERR(cqr)) {
+		DEV_MESSAGE(KERN_WARNING, device, "%s",
+			    "Could not allocate initialization request");
+		return PTR_ERR(cqr);
+	}
+	cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
+        cqr->cpaddr->flags |= CCW_FLAG_SLI;
+        cqr->cpaddr->count = 32;
+	cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
+	cqr->device = device;
+	clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
+	cqr->retries = 0;
+	cqr->expires = 2 * HZ;
+	cqr->buildclk = get_clock();
+	cqr->status = DASD_CQR_FILLED;
+
+	rc = dasd_sleep_on_immediatly(cqr);
+
+	dasd_sfree_request(cqr, cqr->device);
+	return rc;
+}
+
+/*
+ * Reserve device ioctl.
+ * Options are set to 'synchronous wait for interrupt' and
+ * 'timeout the request'. This leads to a terminate IO if 
+ * the interrupt is outstanding for a certain time. 
+ */
+static int
+dasd_eckd_reserve(struct block_device *bdev, int no, long args)
+{
+	struct dasd_device *device;
+	struct dasd_ccw_req *cqr;
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	device = bdev->bd_disk->private_data;
+	if (device == NULL)
+		return -ENODEV;
+
+	cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
+				   1, 32, device);
+	if (IS_ERR(cqr)) {
+		DEV_MESSAGE(KERN_WARNING, device, "%s",
+			    "Could not allocate initialization request");
+		return PTR_ERR(cqr);
+	}
+	cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
+        cqr->cpaddr->flags |= CCW_FLAG_SLI;
+        cqr->cpaddr->count = 32;
+	cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
+	cqr->device = device;
+	clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
+	cqr->retries = 0;
+	cqr->expires = 2 * HZ;
+	cqr->buildclk = get_clock();
+	cqr->status = DASD_CQR_FILLED;
+
+	rc = dasd_sleep_on_immediatly(cqr);
+
+	dasd_sfree_request(cqr, cqr->device);
+	return rc;
+}
+
+/*
+ * Steal lock ioctl - unconditional reserve device.
+ * Buils a channel programm to break a device's reservation. 
+ * (unconditional reserve)
+ */
+static int
+dasd_eckd_steal_lock(struct block_device *bdev, int no, long args)
+{
+	struct dasd_device *device;
+	struct dasd_ccw_req *cqr;
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	device = bdev->bd_disk->private_data;
+	if (device == NULL)
+		return -ENODEV;
+
+	cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
+				   1, 32, device);
+	if (IS_ERR(cqr)) {
+		DEV_MESSAGE(KERN_WARNING, device, "%s",
+			    "Could not allocate initialization request");
+		return PTR_ERR(cqr);
+	}
+	cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
+        cqr->cpaddr->flags |= CCW_FLAG_SLI;
+        cqr->cpaddr->count = 32;
+	cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
+	cqr->device = device;
+	clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
+	cqr->retries = 0;
+	cqr->expires = 2 * HZ;
+	cqr->buildclk = get_clock();
+	cqr->status = DASD_CQR_FILLED;
+
+	rc = dasd_sleep_on_immediatly(cqr);
+
+	dasd_sfree_request(cqr, cqr->device);
+	return rc;
+}
+
+/*
+ * Read performance statistics
+ */
+static int
+dasd_eckd_performance(struct block_device *bdev, int no, long args)
+{
+	struct dasd_device *device;
+	struct dasd_psf_prssd_data *prssdp;
+	struct dasd_rssd_perf_stats_t *stats;
+	struct dasd_ccw_req *cqr;
+	struct ccw1 *ccw;
+	int rc;
+
+	device = bdev->bd_disk->private_data;
+	if (device == NULL)
+		return -ENODEV;
+
+	cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
+				   1 /* PSF */  + 1 /* RSSD */ ,
+				   (sizeof (struct dasd_psf_prssd_data) +
+				    sizeof (struct dasd_rssd_perf_stats_t)),
+				   device);
+	if (IS_ERR(cqr)) {
+		DEV_MESSAGE(KERN_WARNING, device, "%s",
+			    "Could not allocate initialization request");
+		return PTR_ERR(cqr);
+	}
+	cqr->device = device;
+	cqr->retries = 0;
+	cqr->expires = 10 * HZ;
+
+	/* Prepare for Read Subsystem Data */
+	prssdp = (struct dasd_psf_prssd_data *) cqr->data;
+	memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
+	prssdp->order = PSF_ORDER_PRSSD;
+	prssdp->suborder = 0x01;	/* Perfomance Statistics */
+	prssdp->varies[1] = 0x01;	/* Perf Statistics for the Subsystem */
+
+	ccw = cqr->cpaddr;
+	ccw->cmd_code = DASD_ECKD_CCW_PSF;
+	ccw->count = sizeof (struct dasd_psf_prssd_data);
+	ccw->flags |= CCW_FLAG_CC;
+	ccw->cda = (__u32)(addr_t) prssdp;
+
+	/* Read Subsystem Data - Performance Statistics */
+	stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
+	memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
+
+	ccw++;
+	ccw->cmd_code = DASD_ECKD_CCW_RSSD;
+	ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
+	ccw->cda = (__u32)(addr_t) stats;
+
+	cqr->buildclk = get_clock();
+	cqr->status = DASD_CQR_FILLED;
+	rc = dasd_sleep_on(cqr);
+	if (rc == 0) {
+		/* Prepare for Read Subsystem Data */
+		prssdp = (struct dasd_psf_prssd_data *) cqr->data;
+		stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
+		rc = copy_to_user((long __user *) args, (long *) stats,
+				  sizeof(struct dasd_rssd_perf_stats_t));
+	}
+	dasd_sfree_request(cqr, cqr->device);
+	return rc;
+}
+
+/*
+ * Get attributes (cache operations)
+ * Returnes the cache attributes used in Define Extend (DE).
+ */
+static int
+dasd_eckd_get_attrib (struct block_device *bdev, int no, long args)
+{
+	struct dasd_device *device;
+        struct dasd_eckd_private *private;
+        struct attrib_data_t attrib;
+	int rc;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EACCES;
+        if (!args)
+                return -EINVAL;
+
+        device = bdev->bd_disk->private_data;
+        if (device == NULL)
+                return -ENODEV;
+
+        private = (struct dasd_eckd_private *) device->private;
+        attrib = private->attrib;
+
+        rc = copy_to_user((long __user *) args, (long *) &attrib,
+			  sizeof (struct attrib_data_t));
+
+	return rc;
+}
+
+/*
+ * Set attributes (cache operations)
+ * Stores the attributes for cache operation to be used in Define Extend (DE).
+ */
+static int
+dasd_eckd_set_attrib(struct block_device *bdev, int no, long args)
+{
+	struct dasd_device *device;
+	struct dasd_eckd_private *private;
+	struct attrib_data_t attrib;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+	if (!args)
+		return -EINVAL;
+
+	device = bdev->bd_disk->private_data;
+	if (device == NULL)
+		return -ENODEV;
+
+	if (copy_from_user(&attrib, (void __user *) args,
+			   sizeof (struct attrib_data_t))) {
+		return -EFAULT;
+	}
+	private = (struct dasd_eckd_private *) device->private;
+	private->attrib = attrib;
+
+	DEV_MESSAGE(KERN_INFO, device,
+		    "cache operation mode set to %x (%i cylinder prestage)",
+		    private->attrib.operation, private->attrib.nr_cyl);
+	return 0;
+}
+
+/*
+ * Print sense data and related channel program.
+ * Parts are printed because printk buffer is only 1024 bytes.
+ */
+static void
+dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
+		     struct irb *irb)
+{
+	char *page;
+	struct ccw1 *act, *end, *last;
+	int len, sl, sct, count;
+
+	page = (char *) get_zeroed_page(GFP_ATOMIC);
+	if (page == NULL) {
+		DEV_MESSAGE(KERN_ERR, device, " %s",
+			    "No memory to dump sense data");
+		return;
+	}
+	len = sprintf(page, KERN_ERR PRINTK_HEADER
+		      " I/O status report for device %s:\n",
+		      device->cdev->dev.bus_id);
+	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+		       " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
+		       irb->scsw.cstat, irb->scsw.dstat);
+	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+		       " device %s: Failing CCW: %p\n",
+		       device->cdev->dev.bus_id,
+		       (void *) (addr_t) irb->scsw.cpa);
+	if (irb->esw.esw0.erw.cons) {
+		for (sl = 0; sl < 4; sl++) {
+			len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+				       " Sense(hex) %2d-%2d:",
+				       (8 * sl), ((8 * sl) + 7));
+
+			for (sct = 0; sct < 8; sct++) {
+				len += sprintf(page + len, " %02x",
+					       irb->ecw[8 * sl + sct]);
+			}
+			len += sprintf(page + len, "\n");
+		}
+
+		if (irb->ecw[27] & DASD_SENSE_BIT_0) {
+			/* 24 Byte Sense Data */
+			len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+				       " 24 Byte: %x MSG %x, "
+				       "%s MSGb to SYSOP\n",
+				       irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
+				       irb->ecw[1] & 0x10 ? "" : "no");
+		} else {
+			/* 32 Byte Sense Data */
+			len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+				       " 32 Byte: Format: %x "
+				       "Exception class %x\n",
+				       irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
+		}
+	} else {
+	        len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+			       " SORRY - NO VALID SENSE AVAILABLE\n");
+	}
+	MESSAGE_LOG(KERN_ERR, "%s",
+		    page + sizeof(KERN_ERR PRINTK_HEADER));
+
+	/* dump the Channel Program */
+	/* print first CCWs (maximum 8) */
+	act = req->cpaddr;
+        for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
+	end = min(act + 8, last);
+	len = sprintf(page, KERN_ERR PRINTK_HEADER
+		      " Related CP in req: %p\n", req);
+	while (act <= end) {
+		len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+			       " CCW %p: %08X %08X DAT:",
+			       act, ((int *) act)[0], ((int *) act)[1]);
+		for (count = 0; count < 32 && count < act->count;
+		     count += sizeof(int))
+			len += sprintf(page + len, " %08X",
+				       ((int *) (addr_t) act->cda)
+				       [(count>>2)]);
+		len += sprintf(page + len, "\n");
+		act++;
+	}
+	MESSAGE_LOG(KERN_ERR, "%s",
+		    page + sizeof(KERN_ERR PRINTK_HEADER));
+
+	/* print failing CCW area */
+	len = 0;
+	if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
+		act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
+		len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
+	}
+	end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
+	while (act <= end) {
+		len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+			       " CCW %p: %08X %08X DAT:",
+			       act, ((int *) act)[0], ((int *) act)[1]);
+		for (count = 0; count < 32 && count < act->count;
+		     count += sizeof(int))
+			len += sprintf(page + len, " %08X",
+				       ((int *) (addr_t) act->cda)
+				       [(count>>2)]);
+		len += sprintf(page + len, "\n");
+		act++;
+	}
+
+	/* print last CCWs */
+	if (act <  last - 2) {
+		act = last - 2;
+		len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
+	}
+	while (act <= last) {
+		len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+			       " CCW %p: %08X %08X DAT:",
+			       act, ((int *) act)[0], ((int *) act)[1]);
+		for (count = 0; count < 32 && count < act->count;
+		     count += sizeof(int))
+			len += sprintf(page + len, " %08X",
+				       ((int *) (addr_t) act->cda)
+				       [(count>>2)]);
+		len += sprintf(page + len, "\n");
+		act++;
+	}
+	if (len > 0)
+		MESSAGE_LOG(KERN_ERR, "%s",
+			    page + sizeof(KERN_ERR PRINTK_HEADER));
+	free_page((unsigned long) page);
+}
+
+/*
+ * max_blocks is dependent on the amount of storage that is available
+ * in the static io buffer for each device. Currently each device has
+ * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
+ * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
+ * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
+ * addition we have one define extent ccw + 16 bytes of data and one
+ * locate record ccw + 16 bytes of data. That makes:
+ * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
+ * We want to fit two into the available memory so that we can immediately
+ * start the next request if one finishes off. That makes 249.5 blocks
+ * for one request. Give a little safety and the result is 240.
+ */
+static struct dasd_discipline dasd_eckd_discipline = {
+	.owner = THIS_MODULE,
+	.name = "ECKD",
+	.ebcname = "ECKD",
+	.max_blocks = 240,
+	.check_device = dasd_eckd_check_characteristics,
+	.do_analysis = dasd_eckd_do_analysis,
+	.fill_geometry = dasd_eckd_fill_geometry,
+	.start_IO = dasd_start_IO,
+	.term_IO = dasd_term_IO,
+	.format_device = dasd_eckd_format_device,
+	.examine_error = dasd_eckd_examine_error,
+	.erp_action = dasd_eckd_erp_action,
+	.erp_postaction = dasd_eckd_erp_postaction,
+	.build_cp = dasd_eckd_build_cp,
+	.free_cp = dasd_eckd_free_cp,
+	.dump_sense = dasd_eckd_dump_sense,
+	.fill_info = dasd_eckd_fill_info,
+};
+
+static int __init
+dasd_eckd_init(void)
+{
+	int ret;
+
+	dasd_ioctl_no_register(THIS_MODULE, BIODASDGATTR,
+			       dasd_eckd_get_attrib);
+	dasd_ioctl_no_register(THIS_MODULE, BIODASDSATTR,
+			       dasd_eckd_set_attrib);
+	dasd_ioctl_no_register(THIS_MODULE, BIODASDPSRD,
+			       dasd_eckd_performance);
+	dasd_ioctl_no_register(THIS_MODULE, BIODASDRLSE,
+			       dasd_eckd_release);
+	dasd_ioctl_no_register(THIS_MODULE, BIODASDRSRV,
+			       dasd_eckd_reserve);
+	dasd_ioctl_no_register(THIS_MODULE, BIODASDSLCK,
+			       dasd_eckd_steal_lock);
+
+	ASCEBC(dasd_eckd_discipline.ebcname, 4);
+
+	ret = ccw_driver_register(&dasd_eckd_driver);
+	if (ret) {
+		dasd_ioctl_no_unregister(THIS_MODULE, BIODASDGATTR,
+					 dasd_eckd_get_attrib);
+		dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSATTR,
+					 dasd_eckd_set_attrib);
+		dasd_ioctl_no_unregister(THIS_MODULE, BIODASDPSRD,
+					 dasd_eckd_performance);
+		dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRLSE,
+					 dasd_eckd_release);
+		dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRSRV,
+					 dasd_eckd_reserve);
+		dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSLCK,
+					 dasd_eckd_steal_lock);
+		return ret;
+	}
+
+	dasd_generic_auto_online(&dasd_eckd_driver);
+	return 0;
+}
+
+static void __exit
+dasd_eckd_cleanup(void)
+{
+	ccw_driver_unregister(&dasd_eckd_driver);
+
+	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDGATTR,
+				 dasd_eckd_get_attrib);
+	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSATTR,
+				 dasd_eckd_set_attrib);
+	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDPSRD,
+				 dasd_eckd_performance);
+	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRLSE,
+				 dasd_eckd_release);
+	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRSRV,
+				 dasd_eckd_reserve);
+	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSLCK,
+				 dasd_eckd_steal_lock);
+}
+
+module_init(dasd_eckd_init);
+module_exit(dasd_eckd_cleanup);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 4 
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -4
+ * c-argdecl-indent: 4
+ * c-label-offset: -4
+ * c-continued-statement-offset: 4
+ * c-continued-brace-offset: 0
+ * indent-tabs-mode: 1
+ * tab-width: 8
+ * End:
+ */