Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3846 insertions, 0 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
new file mode 100644
index 000000000..58f66176b
--- /dev/null
+++ b/drivers/scsi/sd.c
@@ -0,0 +1,3846 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *      sd.c Copyright (C) 1992 Drew Eckhardt
+ *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
+ *
+ *      Linux scsi disk driver
+ *              Initial versions: Drew Eckhardt
+ *              Subsequent revisions: Eric Youngdale
+ *	Modification history:
+ *       - Drew Eckhardt <drew@colorado.edu> original
+ *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
+ *         outstanding request, and other enhancements.
+ *         Support loadable low-level scsi drivers.
+ *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
+ *         eight major numbers.
+ *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
+ *	 - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
+ *	   sd_init and cleanups.
+ *	 - Alex Davis <letmein@erols.com> Fix problem where partition info
+ *	   not being read in sd_open. Fix problem where removable media 
+ *	   could be ejected after sd_open.
+ *	 - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
+ *	 - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
+ *	   <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
+ *	   Support 32k/1M disks.
+ *
+ *	Logging policy (needs CONFIG_SCSI_LOGGING defined):
+ *	 - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
+ *	 - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
+ *	 - entering sd_ioctl: SCSI_LOG_IOCTL level 1
+ *	 - entering other commands: SCSI_LOG_HLQUEUE level 3
+ *	Note: when the logging level is set by the user, it must be greater
+ *	than the level indicated above to trigger output.	
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bio.h>
+#include <linux/genhd.h>
+#include <linux/hdreg.h>
+#include <linux/errno.h>
+#include <linux/idr.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/blk-pm.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/string_helpers.h>
+#include <linux/async.h>
+#include <linux/slab.h>
+#include <linux/sed-opal.h>
+#include <linux/pm_runtime.h>
+#include <linux/pr.h>
+#include <linux/t10-pi.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsicam.h>
+
+#include "sd.h"
+#include "scsi_priv.h"
+#include "scsi_logging.h"
+
+MODULE_AUTHOR("Eric Youngdale");
+MODULE_DESCRIPTION("SCSI disk (sd) driver");
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
+
+#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
+#define SD_MINORS	16
+#else
+#define SD_MINORS	0
+#endif
+
+static void sd_config_discard(struct scsi_disk *, unsigned int);
+static void sd_config_write_same(struct scsi_disk *);
+static int  sd_revalidate_disk(struct gendisk *);
+static void sd_unlock_native_capacity(struct gendisk *disk);
+static int  sd_probe(struct device *);
+static int  sd_remove(struct device *);
+static void sd_shutdown(struct device *);
+static int sd_suspend_system(struct device *);
+static int sd_suspend_runtime(struct device *);
+static int sd_resume(struct device *);
+static void sd_rescan(struct device *);
+static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
+static void sd_uninit_command(struct scsi_cmnd *SCpnt);
+static int sd_done(struct scsi_cmnd *);
+static void sd_eh_reset(struct scsi_cmnd *);
+static int sd_eh_action(struct scsi_cmnd *, int);
+static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
+static void scsi_disk_release(struct device *cdev);
+
+static DEFINE_IDA(sd_index_ida);
+
+/* This semaphore is used to mediate the 0->1 reference get in the
+ * face of object destruction (i.e. we can't allow a get on an
+ * object after last put) */
+static DEFINE_MUTEX(sd_ref_mutex);
+
+static struct kmem_cache *sd_cdb_cache;
+static mempool_t *sd_cdb_pool;
+static mempool_t *sd_page_pool;
+
+static const char *sd_cache_types[] = {
+	"write through", "none", "write back",
+	"write back, no read (daft)"
+};
+
+static void sd_set_flush_flag(struct scsi_disk *sdkp)
+{
+	bool wc = false, fua = false;
+
+	if (sdkp->WCE) {
+		wc = true;
+		if (sdkp->DPOFUA)
+			fua = true;
+	}
+
+	blk_queue_write_cache(sdkp->disk->queue, wc, fua);
+}
+
+static ssize_t
+cache_type_store(struct device *dev, struct device_attribute *attr,
+		 const char *buf, size_t count)
+{
+	int ct, rcd, wce, sp;
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct scsi_device *sdp = sdkp->device;
+	char buffer[64];
+	char *buffer_data;
+	struct scsi_mode_data data;
+	struct scsi_sense_hdr sshdr;
+	static const char temp[] = "temporary ";
+	int len;
+
+	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
+		/* no cache control on RBC devices; theoretically they
+		 * can do it, but there's probably so many exceptions
+		 * it's not worth the risk */
+		return -EINVAL;
+
+	if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
+		buf += sizeof(temp) - 1;
+		sdkp->cache_override = 1;
+	} else {
+		sdkp->cache_override = 0;
+	}
+
+	ct = sysfs_match_string(sd_cache_types, buf);
+	if (ct < 0)
+		return -EINVAL;
+
+	rcd = ct & 0x01 ? 1 : 0;
+	wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
+
+	if (sdkp->cache_override) {
+		sdkp->WCE = wce;
+		sdkp->RCD = rcd;
+		sd_set_flush_flag(sdkp);
+		return count;
+	}
+
+	if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
+			    sdkp->max_retries, &data, NULL))
+		return -EINVAL;
+	len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
+		  data.block_descriptor_length);
+	buffer_data = buffer + data.header_length +
+		data.block_descriptor_length;
+	buffer_data[2] &= ~0x05;
+	buffer_data[2] |= wce << 2 | rcd;
+	sp = buffer_data[0] & 0x80 ? 1 : 0;
+	buffer_data[0] &= ~0x80;
+
+	/*
+	 * Ensure WP, DPOFUA, and RESERVED fields are cleared in
+	 * received mode parameter buffer before doing MODE SELECT.
+	 */
+	data.device_specific = 0;
+
+	if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
+			     sdkp->max_retries, &data, &sshdr)) {
+		if (scsi_sense_valid(&sshdr))
+			sd_print_sense_hdr(sdkp, &sshdr);
+		return -EINVAL;
+	}
+	sd_revalidate_disk(sdkp->disk);
+	return count;
+}
+
+static ssize_t
+manage_start_stop_show(struct device *dev, struct device_attribute *attr,
+		       char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct scsi_device *sdp = sdkp->device;
+
+	return sprintf(buf, "%u\n", sdp->manage_start_stop);
+}
+
+static ssize_t
+manage_start_stop_store(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct scsi_device *sdp = sdkp->device;
+	bool v;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	if (kstrtobool(buf, &v))
+		return -EINVAL;
+
+	sdp->manage_start_stop = v;
+
+	return count;
+}
+static DEVICE_ATTR_RW(manage_start_stop);
+
+static ssize_t
+allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%u\n", sdkp->device->allow_restart);
+}
+
+static ssize_t
+allow_restart_store(struct device *dev, struct device_attribute *attr,
+		    const char *buf, size_t count)
+{
+	bool v;
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct scsi_device *sdp = sdkp->device;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
+		return -EINVAL;
+
+	if (kstrtobool(buf, &v))
+		return -EINVAL;
+
+	sdp->allow_restart = v;
+
+	return count;
+}
+static DEVICE_ATTR_RW(allow_restart);
+
+static ssize_t
+cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	int ct = sdkp->RCD + 2*sdkp->WCE;
+
+	return sprintf(buf, "%s\n", sd_cache_types[ct]);
+}
+static DEVICE_ATTR_RW(cache_type);
+
+static ssize_t
+FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%u\n", sdkp->DPOFUA);
+}
+static DEVICE_ATTR_RO(FUA);
+
+static ssize_t
+protection_type_show(struct device *dev, struct device_attribute *attr,
+		     char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%u\n", sdkp->protection_type);
+}
+
+static ssize_t
+protection_type_store(struct device *dev, struct device_attribute *attr,
+		      const char *buf, size_t count)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	unsigned int val;
+	int err;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	err = kstrtouint(buf, 10, &val);
+
+	if (err)
+		return err;
+
+	if (val <= T10_PI_TYPE3_PROTECTION)
+		sdkp->protection_type = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(protection_type);
+
+static ssize_t
+protection_mode_show(struct device *dev, struct device_attribute *attr,
+		     char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct scsi_device *sdp = sdkp->device;
+	unsigned int dif, dix;
+
+	dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
+	dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
+
+	if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
+		dif = 0;
+		dix = 1;
+	}
+
+	if (!dif && !dix)
+		return sprintf(buf, "none\n");
+
+	return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
+}
+static DEVICE_ATTR_RO(protection_mode);
+
+static ssize_t
+app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%u\n", sdkp->ATO);
+}
+static DEVICE_ATTR_RO(app_tag_own);
+
+static ssize_t
+thin_provisioning_show(struct device *dev, struct device_attribute *attr,
+		       char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%u\n", sdkp->lbpme);
+}
+static DEVICE_ATTR_RO(thin_provisioning);
+
+/* sysfs_match_string() requires dense arrays */
+static const char *lbp_mode[] = {
+	[SD_LBP_FULL]		= "full",
+	[SD_LBP_UNMAP]		= "unmap",
+	[SD_LBP_WS16]		= "writesame_16",
+	[SD_LBP_WS10]		= "writesame_10",
+	[SD_LBP_ZERO]		= "writesame_zero",
+	[SD_LBP_DISABLE]	= "disabled",
+};
+
+static ssize_t
+provisioning_mode_show(struct device *dev, struct device_attribute *attr,
+		       char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
+}
+
+static ssize_t
+provisioning_mode_store(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct scsi_device *sdp = sdkp->device;
+	int mode;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	if (sd_is_zoned(sdkp)) {
+		sd_config_discard(sdkp, SD_LBP_DISABLE);
+		return count;
+	}
+
+	if (sdp->type != TYPE_DISK)
+		return -EINVAL;
+
+	mode = sysfs_match_string(lbp_mode, buf);
+	if (mode < 0)
+		return -EINVAL;
+
+	sd_config_discard(sdkp, mode);
+
+	return count;
+}
+static DEVICE_ATTR_RW(provisioning_mode);
+
+/* sysfs_match_string() requires dense arrays */
+static const char *zeroing_mode[] = {
+	[SD_ZERO_WRITE]		= "write",
+	[SD_ZERO_WS]		= "writesame",
+	[SD_ZERO_WS16_UNMAP]	= "writesame_16_unmap",
+	[SD_ZERO_WS10_UNMAP]	= "writesame_10_unmap",
+};
+
+static ssize_t
+zeroing_mode_show(struct device *dev, struct device_attribute *attr,
+		  char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
+}
+
+static ssize_t
+zeroing_mode_store(struct device *dev, struct device_attribute *attr,
+		   const char *buf, size_t count)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	int mode;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	mode = sysfs_match_string(zeroing_mode, buf);
+	if (mode < 0)
+		return -EINVAL;
+
+	sdkp->zeroing_mode = mode;
+
+	return count;
+}
+static DEVICE_ATTR_RW(zeroing_mode);
+
+static ssize_t
+max_medium_access_timeouts_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
+}
+
+static ssize_t
+max_medium_access_timeouts_store(struct device *dev,
+				 struct device_attribute *attr, const char *buf,
+				 size_t count)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	int err;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
+
+	return err ? err : count;
+}
+static DEVICE_ATTR_RW(max_medium_access_timeouts);
+
+static ssize_t
+max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
+}
+
+static ssize_t
+max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct scsi_device *sdp = sdkp->device;
+	unsigned long max;
+	int err;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
+		return -EINVAL;
+
+	err = kstrtoul(buf, 10, &max);
+
+	if (err)
+		return err;
+
+	if (max == 0)
+		sdp->no_write_same = 1;
+	else if (max <= SD_MAX_WS16_BLOCKS) {
+		sdp->no_write_same = 0;
+		sdkp->max_ws_blocks = max;
+	}
+
+	sd_config_write_same(sdkp);
+
+	return count;
+}
+static DEVICE_ATTR_RW(max_write_same_blocks);
+
+static ssize_t
+zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	if (sdkp->device->type == TYPE_ZBC)
+		return sprintf(buf, "host-managed\n");
+	if (sdkp->zoned == 1)
+		return sprintf(buf, "host-aware\n");
+	if (sdkp->zoned == 2)
+		return sprintf(buf, "drive-managed\n");
+	return sprintf(buf, "none\n");
+}
+static DEVICE_ATTR_RO(zoned_cap);
+
+static ssize_t
+max_retries_store(struct device *dev, struct device_attribute *attr,
+		  const char *buf, size_t count)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct scsi_device *sdev = sdkp->device;
+	int retries, err;
+
+	err = kstrtoint(buf, 10, &retries);
+	if (err)
+		return err;
+
+	if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) {
+		sdkp->max_retries = retries;
+		return count;
+	}
+
+	sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n",
+		    SD_MAX_RETRIES);
+	return -EINVAL;
+}
+
+static ssize_t
+max_retries_show(struct device *dev, struct device_attribute *attr,
+		 char *buf)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+	return sprintf(buf, "%d\n", sdkp->max_retries);
+}
+
+static DEVICE_ATTR_RW(max_retries);
+
+static struct attribute *sd_disk_attrs[] = {
+	&dev_attr_cache_type.attr,
+	&dev_attr_FUA.attr,
+	&dev_attr_allow_restart.attr,
+	&dev_attr_manage_start_stop.attr,
+	&dev_attr_protection_type.attr,
+	&dev_attr_protection_mode.attr,
+	&dev_attr_app_tag_own.attr,
+	&dev_attr_thin_provisioning.attr,
+	&dev_attr_provisioning_mode.attr,
+	&dev_attr_zeroing_mode.attr,
+	&dev_attr_max_write_same_blocks.attr,
+	&dev_attr_max_medium_access_timeouts.attr,
+	&dev_attr_zoned_cap.attr,
+	&dev_attr_max_retries.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(sd_disk);
+
+static struct class sd_disk_class = {
+	.name		= "scsi_disk",
+	.owner		= THIS_MODULE,
+	.dev_release	= scsi_disk_release,
+	.dev_groups	= sd_disk_groups,
+};
+
+static const struct dev_pm_ops sd_pm_ops = {
+	.suspend		= sd_suspend_system,
+	.resume			= sd_resume,
+	.poweroff		= sd_suspend_system,
+	.restore		= sd_resume,
+	.runtime_suspend	= sd_suspend_runtime,
+	.runtime_resume		= sd_resume,
+};
+
+static struct scsi_driver sd_template = {
+	.gendrv = {
+		.name		= "sd",
+		.owner		= THIS_MODULE,
+		.probe		= sd_probe,
+		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
+		.remove		= sd_remove,
+		.shutdown	= sd_shutdown,
+		.pm		= &sd_pm_ops,
+	},
+	.rescan			= sd_rescan,
+	.init_command		= sd_init_command,
+	.uninit_command		= sd_uninit_command,
+	.done			= sd_done,
+	.eh_action		= sd_eh_action,
+	.eh_reset		= sd_eh_reset,
+};
+
+/*
+ * Dummy kobj_map->probe function.
+ * The default ->probe function will call modprobe, which is
+ * pointless as this module is already loaded.
+ */
+static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
+{
+	return NULL;
+}
+
+/*
+ * Device no to disk mapping:
+ * 
+ *       major         disc2     disc  p1
+ *   |............|.............|....|....| <- dev_t
+ *    31        20 19          8 7  4 3  0
+ * 
+ * Inside a major, we have 16k disks, however mapped non-
+ * contiguously. The first 16 disks are for major0, the next
+ * ones with major1, ... Disk 256 is for major0 again, disk 272 
+ * for major1, ... 
+ * As we stay compatible with our numbering scheme, we can reuse 
+ * the well-know SCSI majors 8, 65--71, 136--143.
+ */
+static int sd_major(int major_idx)
+{
+	switch (major_idx) {
+	case 0:
+		return SCSI_DISK0_MAJOR;
+	case 1 ... 7:
+		return SCSI_DISK1_MAJOR + major_idx - 1;
+	case 8 ... 15:
+		return SCSI_DISK8_MAJOR + major_idx - 8;
+	default:
+		BUG();
+		return 0;	/* shut up gcc */
+	}
+}
+
+static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
+{
+	struct scsi_disk *sdkp = NULL;
+
+	mutex_lock(&sd_ref_mutex);
+
+	if (disk->private_data) {
+		sdkp = scsi_disk(disk);
+		if (scsi_device_get(sdkp->device) == 0)
+			get_device(&sdkp->dev);
+		else
+			sdkp = NULL;
+	}
+	mutex_unlock(&sd_ref_mutex);
+	return sdkp;
+}
+
+static void scsi_disk_put(struct scsi_disk *sdkp)
+{
+	struct scsi_device *sdev = sdkp->device;
+
+	mutex_lock(&sd_ref_mutex);
+	put_device(&sdkp->dev);
+	scsi_device_put(sdev);
+	mutex_unlock(&sd_ref_mutex);
+}
+
+#ifdef CONFIG_BLK_SED_OPAL
+static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
+		size_t len, bool send)
+{
+	struct scsi_disk *sdkp = data;
+	struct scsi_device *sdev = sdkp->device;
+	u8 cdb[12] = { 0, };
+	int ret;
+
+	cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
+	cdb[1] = secp;
+	put_unaligned_be16(spsp, &cdb[2]);
+	put_unaligned_be32(len, &cdb[6]);
+
+	ret = scsi_execute(sdev, cdb, send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
+		buffer, len, NULL, NULL, SD_TIMEOUT, sdkp->max_retries, 0,
+		RQF_PM, NULL);
+	return ret <= 0 ? ret : -EIO;
+}
+#endif /* CONFIG_BLK_SED_OPAL */
+
+/*
+ * Look up the DIX operation based on whether the command is read or
+ * write and whether dix and dif are enabled.
+ */
+static unsigned int sd_prot_op(bool write, bool dix, bool dif)
+{
+	/* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
+	static const unsigned int ops[] = {	/* wrt dix dif */
+		SCSI_PROT_NORMAL,		/*  0	0   0  */
+		SCSI_PROT_READ_STRIP,		/*  0	0   1  */
+		SCSI_PROT_READ_INSERT,		/*  0	1   0  */
+		SCSI_PROT_READ_PASS,		/*  0	1   1  */
+		SCSI_PROT_NORMAL,		/*  1	0   0  */
+		SCSI_PROT_WRITE_INSERT,		/*  1	0   1  */
+		SCSI_PROT_WRITE_STRIP,		/*  1	1   0  */
+		SCSI_PROT_WRITE_PASS,		/*  1	1   1  */
+	};
+
+	return ops[write << 2 | dix << 1 | dif];
+}
+
+/*
+ * Returns a mask of the protection flags that are valid for a given DIX
+ * operation.
+ */
+static unsigned int sd_prot_flag_mask(unsigned int prot_op)
+{
+	static const unsigned int flag_mask[] = {
+		[SCSI_PROT_NORMAL]		= 0,
+
+		[SCSI_PROT_READ_STRIP]		= SCSI_PROT_TRANSFER_PI |
+						  SCSI_PROT_GUARD_CHECK |
+						  SCSI_PROT_REF_CHECK |
+						  SCSI_PROT_REF_INCREMENT,
+
+		[SCSI_PROT_READ_INSERT]		= SCSI_PROT_REF_INCREMENT |
+						  SCSI_PROT_IP_CHECKSUM,
+
+		[SCSI_PROT_READ_PASS]		= SCSI_PROT_TRANSFER_PI |
+						  SCSI_PROT_GUARD_CHECK |
+						  SCSI_PROT_REF_CHECK |
+						  SCSI_PROT_REF_INCREMENT |
+						  SCSI_PROT_IP_CHECKSUM,
+
+		[SCSI_PROT_WRITE_INSERT]	= SCSI_PROT_TRANSFER_PI |
+						  SCSI_PROT_REF_INCREMENT,
+
+		[SCSI_PROT_WRITE_STRIP]		= SCSI_PROT_GUARD_CHECK |
+						  SCSI_PROT_REF_CHECK |
+						  SCSI_PROT_REF_INCREMENT |
+						  SCSI_PROT_IP_CHECKSUM,
+
+		[SCSI_PROT_WRITE_PASS]		= SCSI_PROT_TRANSFER_PI |
+						  SCSI_PROT_GUARD_CHECK |
+						  SCSI_PROT_REF_CHECK |
+						  SCSI_PROT_REF_INCREMENT |
+						  SCSI_PROT_IP_CHECKSUM,
+	};
+
+	return flag_mask[prot_op];
+}
+
+static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
+					   unsigned int dix, unsigned int dif)
+{
+	struct bio *bio = scmd->request->bio;
+	unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
+	unsigned int protect = 0;
+
+	if (dix) {				/* DIX Type 0, 1, 2, 3 */
+		if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
+			scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
+
+		if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
+			scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
+	}
+
+	if (dif != T10_PI_TYPE3_PROTECTION) {	/* DIX/DIF Type 0, 1, 2 */
+		scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
+
+		if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
+			scmd->prot_flags |= SCSI_PROT_REF_CHECK;
+	}
+
+	if (dif) {				/* DIX/DIF Type 1, 2, 3 */
+		scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
+
+		if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
+			protect = 3 << 5;	/* Disable target PI checking */
+		else
+			protect = 1 << 5;	/* Enable target PI checking */
+	}
+
+	scsi_set_prot_op(scmd, prot_op);
+	scsi_set_prot_type(scmd, dif);
+	scmd->prot_flags &= sd_prot_flag_mask(prot_op);
+
+	return protect;
+}
+
+static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
+{
+	struct request_queue *q = sdkp->disk->queue;
+	unsigned int logical_block_size = sdkp->device->sector_size;
+	unsigned int max_blocks = 0;
+
+	q->limits.discard_alignment =
+		sdkp->unmap_alignment * logical_block_size;
+	q->limits.discard_granularity =
+		max(sdkp->physical_block_size,
+		    sdkp->unmap_granularity * logical_block_size);
+	sdkp->provisioning_mode = mode;
+
+	switch (mode) {
+
+	case SD_LBP_FULL:
+	case SD_LBP_DISABLE:
+		blk_queue_max_discard_sectors(q, 0);
+		blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
+		return;
+
+	case SD_LBP_UNMAP:
+		max_blocks = min_not_zero(sdkp->max_unmap_blocks,
+					  (u32)SD_MAX_WS16_BLOCKS);
+		break;
+
+	case SD_LBP_WS16:
+		if (sdkp->device->unmap_limit_for_ws)
+			max_blocks = sdkp->max_unmap_blocks;
+		else
+			max_blocks = sdkp->max_ws_blocks;
+
+		max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
+		break;
+
+	case SD_LBP_WS10:
+		if (sdkp->device->unmap_limit_for_ws)
+			max_blocks = sdkp->max_unmap_blocks;
+		else
+			max_blocks = sdkp->max_ws_blocks;
+
+		max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
+		break;
+
+	case SD_LBP_ZERO:
+		max_blocks = min_not_zero(sdkp->max_ws_blocks,
+					  (u32)SD_MAX_WS10_BLOCKS);
+		break;
+	}
+
+	blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
+	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
+}
+
+static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
+{
+	struct scsi_device *sdp = cmd->device;
+	struct request *rq = cmd->request;
+	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
+	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
+	unsigned int data_len = 24;
+	char *buf;
+
+	rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
+	if (!rq->special_vec.bv_page)
+		return BLK_STS_RESOURCE;
+	clear_highpage(rq->special_vec.bv_page);
+	rq->special_vec.bv_offset = 0;
+	rq->special_vec.bv_len = data_len;
+	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
+
+	cmd->cmd_len = 10;
+	cmd->cmnd[0] = UNMAP;
+	cmd->cmnd[8] = 24;
+
+	buf = page_address(rq->special_vec.bv_page);
+	put_unaligned_be16(6 + 16, &buf[0]);
+	put_unaligned_be16(16, &buf[2]);
+	put_unaligned_be64(lba, &buf[8]);
+	put_unaligned_be32(nr_blocks, &buf[16]);
+
+	cmd->allowed = sdkp->max_retries;
+	cmd->transfersize = data_len;
+	rq->timeout = SD_TIMEOUT;
+
+	return scsi_alloc_sgtables(cmd);
+}
+
+static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
+		bool unmap)
+{
+	struct scsi_device *sdp = cmd->device;
+	struct request *rq = cmd->request;
+	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
+	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
+	u32 data_len = sdp->sector_size;
+
+	rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
+	if (!rq->special_vec.bv_page)
+		return BLK_STS_RESOURCE;
+	clear_highpage(rq->special_vec.bv_page);
+	rq->special_vec.bv_offset = 0;
+	rq->special_vec.bv_len = data_len;
+	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
+
+	cmd->cmd_len = 16;
+	cmd->cmnd[0] = WRITE_SAME_16;
+	if (unmap)
+		cmd->cmnd[1] = 0x8; /* UNMAP */
+	put_unaligned_be64(lba, &cmd->cmnd[2]);
+	put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
+
+	cmd->allowed = sdkp->max_retries;
+	cmd->transfersize = data_len;
+	rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
+
+	return scsi_alloc_sgtables(cmd);
+}
+
+static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
+		bool unmap)
+{
+	struct scsi_device *sdp = cmd->device;
+	struct request *rq = cmd->request;
+	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
+	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
+	u32 data_len = sdp->sector_size;
+
+	rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
+	if (!rq->special_vec.bv_page)
+		return BLK_STS_RESOURCE;
+	clear_highpage(rq->special_vec.bv_page);
+	rq->special_vec.bv_offset = 0;
+	rq->special_vec.bv_len = data_len;
+	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
+
+	cmd->cmd_len = 10;
+	cmd->cmnd[0] = WRITE_SAME;
+	if (unmap)
+		cmd->cmnd[1] = 0x8; /* UNMAP */
+	put_unaligned_be32(lba, &cmd->cmnd[2]);
+	put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
+
+	cmd->allowed = sdkp->max_retries;
+	cmd->transfersize = data_len;
+	rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
+
+	return scsi_alloc_sgtables(cmd);
+}
+
+static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
+{
+	struct request *rq = cmd->request;
+	struct scsi_device *sdp = cmd->device;
+	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
+	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
+
+	if (!(rq->cmd_flags & REQ_NOUNMAP)) {
+		switch (sdkp->zeroing_mode) {
+		case SD_ZERO_WS16_UNMAP:
+			return sd_setup_write_same16_cmnd(cmd, true);
+		case SD_ZERO_WS10_UNMAP:
+			return sd_setup_write_same10_cmnd(cmd, true);
+		}
+	}
+
+	if (sdp->no_write_same) {
+		rq->rq_flags |= RQF_QUIET;
+		return BLK_STS_TARGET;
+	}
+
+	if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
+		return sd_setup_write_same16_cmnd(cmd, false);
+
+	return sd_setup_write_same10_cmnd(cmd, false);
+}
+
+static void sd_config_write_same(struct scsi_disk *sdkp)
+{
+	struct request_queue *q = sdkp->disk->queue;
+	unsigned int logical_block_size = sdkp->device->sector_size;
+
+	if (sdkp->device->no_write_same) {
+		sdkp->max_ws_blocks = 0;
+		goto out;
+	}
+
+	/* Some devices can not handle block counts above 0xffff despite
+	 * supporting WRITE SAME(16). Consequently we default to 64k
+	 * blocks per I/O unless the device explicitly advertises a
+	 * bigger limit.
+	 */
+	if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
+		sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
+						   (u32)SD_MAX_WS16_BLOCKS);
+	else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
+		sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
+						   (u32)SD_MAX_WS10_BLOCKS);
+	else {
+		sdkp->device->no_write_same = 1;
+		sdkp->max_ws_blocks = 0;
+	}
+
+	if (sdkp->lbprz && sdkp->lbpws)
+		sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
+	else if (sdkp->lbprz && sdkp->lbpws10)
+		sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
+	else if (sdkp->max_ws_blocks)
+		sdkp->zeroing_mode = SD_ZERO_WS;
+	else
+		sdkp->zeroing_mode = SD_ZERO_WRITE;
+
+	if (sdkp->max_ws_blocks &&
+	    sdkp->physical_block_size > logical_block_size) {
+		/*
+		 * Reporting a maximum number of blocks that is not aligned
+		 * on the device physical size would cause a large write same
+		 * request to be split into physically unaligned chunks by
+		 * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
+		 * even if the caller of these functions took care to align the
+		 * large request. So make sure the maximum reported is aligned
+		 * to the device physical block size. This is only an optional
+		 * optimization for regular disks, but this is mandatory to
+		 * avoid failure of large write same requests directed at
+		 * sequential write required zones of host-managed ZBC disks.
+		 */
+		sdkp->max_ws_blocks =
+			round_down(sdkp->max_ws_blocks,
+				   bytes_to_logical(sdkp->device,
+						    sdkp->physical_block_size));
+	}
+
+out:
+	blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
+					 (logical_block_size >> 9));
+	blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
+					 (logical_block_size >> 9));
+}
+
+/**
+ * sd_setup_write_same_cmnd - write the same data to multiple blocks
+ * @cmd: command to prepare
+ *
+ * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
+ * the preference indicated by the target device.
+ **/
+static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
+{
+	struct request *rq = cmd->request;
+	struct scsi_device *sdp = cmd->device;
+	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+	struct bio *bio = rq->bio;
+	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
+	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
+	unsigned int nr_bytes = blk_rq_bytes(rq);
+	blk_status_t ret;
+
+	if (sdkp->device->no_write_same)
+		return BLK_STS_TARGET;
+
+	BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
+
+	rq->timeout = SD_WRITE_SAME_TIMEOUT;
+
+	if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) {
+		cmd->cmd_len = 16;
+		cmd->cmnd[0] = WRITE_SAME_16;
+		put_unaligned_be64(lba, &cmd->cmnd[2]);
+		put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
+	} else {
+		cmd->cmd_len = 10;
+		cmd->cmnd[0] = WRITE_SAME;
+		put_unaligned_be32(lba, &cmd->cmnd[2]);
+		put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
+	}
+
+	cmd->transfersize = sdp->sector_size;
+	cmd->allowed = sdkp->max_retries;
+
+	/*
+	 * For WRITE SAME the data transferred via the DATA OUT buffer is
+	 * different from the amount of data actually written to the target.
+	 *
+	 * We set up __data_len to the amount of data transferred via the
+	 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
+	 * to transfer a single sector of data first, but then reset it to
+	 * the amount of data to be written right after so that the I/O path
+	 * knows how much to actually write.
+	 */
+	rq->__data_len = sdp->sector_size;
+	ret = scsi_alloc_sgtables(cmd);
+	rq->__data_len = nr_bytes;
+
+	return ret;
+}
+
+static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
+{
+	struct request *rq = cmd->request;
+	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+
+	/* flush requests don't perform I/O, zero the S/G table */
+	memset(&cmd->sdb, 0, sizeof(cmd->sdb));
+
+	cmd->cmnd[0] = SYNCHRONIZE_CACHE;
+	cmd->cmd_len = 10;
+	cmd->transfersize = 0;
+	cmd->allowed = sdkp->max_retries;
+
+	rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
+	return BLK_STS_OK;
+}
+
+static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
+				       sector_t lba, unsigned int nr_blocks,
+				       unsigned char flags)
+{
+	cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
+	if (unlikely(cmd->cmnd == NULL))
+		return BLK_STS_RESOURCE;
+
+	cmd->cmd_len = SD_EXT_CDB_SIZE;
+	memset(cmd->cmnd, 0, cmd->cmd_len);
+
+	cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
+	cmd->cmnd[7]  = 0x18; /* Additional CDB len */
+	cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
+	cmd->cmnd[10] = flags;
+	put_unaligned_be64(lba, &cmd->cmnd[12]);
+	put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
+	put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
+
+	return BLK_STS_OK;
+}
+
+static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
+				       sector_t lba, unsigned int nr_blocks,
+				       unsigned char flags)
+{
+	cmd->cmd_len  = 16;
+	cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
+	cmd->cmnd[1]  = flags;
+	cmd->cmnd[14] = 0;
+	cmd->cmnd[15] = 0;
+	put_unaligned_be64(lba, &cmd->cmnd[2]);
+	put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
+
+	return BLK_STS_OK;
+}
+
+static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
+				       sector_t lba, unsigned int nr_blocks,
+				       unsigned char flags)
+{
+	cmd->cmd_len = 10;
+	cmd->cmnd[0] = write ? WRITE_10 : READ_10;
+	cmd->cmnd[1] = flags;
+	cmd->cmnd[6] = 0;
+	cmd->cmnd[9] = 0;
+	put_unaligned_be32(lba, &cmd->cmnd[2]);
+	put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
+
+	return BLK_STS_OK;
+}
+
+static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
+				      sector_t lba, unsigned int nr_blocks,
+				      unsigned char flags)
+{
+	/* Avoid that 0 blocks gets translated into 256 blocks. */
+	if (WARN_ON_ONCE(nr_blocks == 0))
+		return BLK_STS_IOERR;
+
+	if (unlikely(flags & 0x8)) {
+		/*
+		 * This happens only if this drive failed 10byte rw
+		 * command with ILLEGAL_REQUEST during operation and
+		 * thus turned off use_10_for_rw.
+		 */
+		scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
+		return BLK_STS_IOERR;
+	}
+
+	cmd->cmd_len = 6;
+	cmd->cmnd[0] = write ? WRITE_6 : READ_6;
+	cmd->cmnd[1] = (lba >> 16) & 0x1f;
+	cmd->cmnd[2] = (lba >> 8) & 0xff;
+	cmd->cmnd[3] = lba & 0xff;
+	cmd->cmnd[4] = nr_blocks;
+	cmd->cmnd[5] = 0;
+
+	return BLK_STS_OK;
+}
+
+static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
+{
+	struct request *rq = cmd->request;
+	struct scsi_device *sdp = cmd->device;
+	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+	sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
+	sector_t threshold;
+	unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
+	unsigned int mask = logical_to_sectors(sdp, 1) - 1;
+	bool write = rq_data_dir(rq) == WRITE;
+	unsigned char protect, fua;
+	blk_status_t ret;
+	unsigned int dif;
+	bool dix;
+
+	ret = scsi_alloc_sgtables(cmd);
+	if (ret != BLK_STS_OK)
+		return ret;
+
+	ret = BLK_STS_IOERR;
+	if (!scsi_device_online(sdp) || sdp->changed) {
+		scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
+		goto fail;
+	}
+
+	if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) {
+		scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
+		goto fail;
+	}
+
+	if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
+		scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
+		goto fail;
+	}
+
+	/*
+	 * Some SD card readers can't handle accesses which touch the
+	 * last one or two logical blocks. Split accesses as needed.
+	 */
+	threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
+
+	if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
+		if (lba < threshold) {
+			/* Access up to the threshold but not beyond */
+			nr_blocks = threshold - lba;
+		} else {
+			/* Access only a single logical block */
+			nr_blocks = 1;
+		}
+	}
+
+	if (req_op(rq) == REQ_OP_ZONE_APPEND) {
+		ret = sd_zbc_prepare_zone_append(cmd, &lba, nr_blocks);
+		if (ret)
+			goto fail;
+	}
+
+	fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
+	dix = scsi_prot_sg_count(cmd);
+	dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
+
+	if (dif || dix)
+		protect = sd_setup_protect_cmnd(cmd, dix, dif);
+	else
+		protect = 0;
+
+	if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
+		ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
+					 protect | fua);
+	} else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
+		ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
+					 protect | fua);
+	} else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
+		   sdp->use_10_for_rw || protect) {
+		ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
+					 protect | fua);
+	} else {
+		ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
+					protect | fua);
+	}
+
+	if (unlikely(ret != BLK_STS_OK))
+		goto fail;
+
+	/*
+	 * We shouldn't disconnect in the middle of a sector, so with a dumb
+	 * host adapter, it's safe to assume that we can at least transfer
+	 * this many bytes between each connect / disconnect.
+	 */
+	cmd->transfersize = sdp->sector_size;
+	cmd->underflow = nr_blocks << 9;
+	cmd->allowed = sdkp->max_retries;
+	cmd->sdb.length = nr_blocks * sdp->sector_size;
+
+	SCSI_LOG_HLQUEUE(1,
+			 scmd_printk(KERN_INFO, cmd,
+				     "%s: block=%llu, count=%d\n", __func__,
+				     (unsigned long long)blk_rq_pos(rq),
+				     blk_rq_sectors(rq)));
+	SCSI_LOG_HLQUEUE(2,
+			 scmd_printk(KERN_INFO, cmd,
+				     "%s %d/%u 512 byte blocks.\n",
+				     write ? "writing" : "reading", nr_blocks,
+				     blk_rq_sectors(rq)));
+
+	/*
+	 * This indicates that the command is ready from our end to be queued.
+	 */
+	return BLK_STS_OK;
+fail:
+	scsi_free_sgtables(cmd);
+	return ret;
+}
+
+static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
+{
+	struct request *rq = cmd->request;
+
+	switch (req_op(rq)) {
+	case REQ_OP_DISCARD:
+		switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
+		case SD_LBP_UNMAP:
+			return sd_setup_unmap_cmnd(cmd);
+		case SD_LBP_WS16:
+			return sd_setup_write_same16_cmnd(cmd, true);
+		case SD_LBP_WS10:
+			return sd_setup_write_same10_cmnd(cmd, true);
+		case SD_LBP_ZERO:
+			return sd_setup_write_same10_cmnd(cmd, false);
+		default:
+			return BLK_STS_TARGET;
+		}
+	case REQ_OP_WRITE_ZEROES:
+		return sd_setup_write_zeroes_cmnd(cmd);
+	case REQ_OP_WRITE_SAME:
+		return sd_setup_write_same_cmnd(cmd);
+	case REQ_OP_FLUSH:
+		return sd_setup_flush_cmnd(cmd);
+	case REQ_OP_READ:
+	case REQ_OP_WRITE:
+	case REQ_OP_ZONE_APPEND:
+		return sd_setup_read_write_cmnd(cmd);
+	case REQ_OP_ZONE_RESET:
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
+						   false);
+	case REQ_OP_ZONE_RESET_ALL:
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
+						   true);
+	case REQ_OP_ZONE_OPEN:
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
+	case REQ_OP_ZONE_CLOSE:
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
+	case REQ_OP_ZONE_FINISH:
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
+	default:
+		WARN_ON_ONCE(1);
+		return BLK_STS_NOTSUPP;
+	}
+}
+
+static void sd_uninit_command(struct scsi_cmnd *SCpnt)
+{
+	struct request *rq = SCpnt->request;
+	u8 *cmnd;
+
+	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
+		mempool_free(rq->special_vec.bv_page, sd_page_pool);
+
+	if (SCpnt->cmnd != scsi_req(rq)->cmd) {
+		cmnd = SCpnt->cmnd;
+		SCpnt->cmnd = NULL;
+		SCpnt->cmd_len = 0;
+		mempool_free(cmnd, sd_cdb_pool);
+	}
+}
+
+static bool sd_need_revalidate(struct block_device *bdev,
+		struct scsi_disk *sdkp)
+{
+	if (sdkp->device->removable || sdkp->write_prot) {
+		if (bdev_check_media_change(bdev))
+			return true;
+	}
+
+	/*
+	 * Force a full rescan after ioctl(BLKRRPART).  While the disk state has
+	 * nothing to do with partitions, BLKRRPART is used to force a full
+	 * revalidate after things like a format for historical reasons.
+	 */
+	return test_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
+}
+
+/**
+ *	sd_open - open a scsi disk device
+ *	@bdev: Block device of the scsi disk to open
+ *	@mode: FMODE_* mask
+ *
+ *	Returns 0 if successful. Returns a negated errno value in case 
+ *	of error.
+ *
+ *	Note: This can be called from a user context (e.g. fsck(1) )
+ *	or from within the kernel (e.g. as a result of a mount(1) ).
+ *	In the latter case @inode and @filp carry an abridged amount
+ *	of information as noted above.
+ *
+ *	Locking: called with bdev->bd_mutex held.
+ **/
+static int sd_open(struct block_device *bdev, fmode_t mode)
+{
+	struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
+	struct scsi_device *sdev;
+	int retval;
+
+	if (!sdkp)
+		return -ENXIO;
+
+	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
+
+	sdev = sdkp->device;
+
+	/*
+	 * If the device is in error recovery, wait until it is done.
+	 * If the device is offline, then disallow any access to it.
+	 */
+	retval = -ENXIO;
+	if (!scsi_block_when_processing_errors(sdev))
+		goto error_out;
+
+	if (sd_need_revalidate(bdev, sdkp))
+		sd_revalidate_disk(bdev->bd_disk);
+
+	/*
+	 * If the drive is empty, just let the open fail.
+	 */
+	retval = -ENOMEDIUM;
+	if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
+		goto error_out;
+
+	/*
+	 * If the device has the write protect tab set, have the open fail
+	 * if the user expects to be able to write to the thing.
+	 */
+	retval = -EROFS;
+	if (sdkp->write_prot && (mode & FMODE_WRITE))
+		goto error_out;
+
+	/*
+	 * It is possible that the disk changing stuff resulted in
+	 * the device being taken offline.  If this is the case,
+	 * report this to the user, and don't pretend that the
+	 * open actually succeeded.
+	 */
+	retval = -ENXIO;
+	if (!scsi_device_online(sdev))
+		goto error_out;
+
+	if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
+		if (scsi_block_when_processing_errors(sdev))
+			scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
+	}
+
+	return 0;
+
+error_out:
+	scsi_disk_put(sdkp);
+	return retval;	
+}
+
+/**
+ *	sd_release - invoked when the (last) close(2) is called on this
+ *	scsi disk.
+ *	@disk: disk to release
+ *	@mode: FMODE_* mask
+ *
+ *	Returns 0. 
+ *
+ *	Note: may block (uninterruptible) if error recovery is underway
+ *	on this disk.
+ *
+ *	Locking: called with bdev->bd_mutex held.
+ **/
+static void sd_release(struct gendisk *disk, fmode_t mode)
+{
+	struct scsi_disk *sdkp = scsi_disk(disk);
+	struct scsi_device *sdev = sdkp->device;
+
+	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
+
+	if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
+		if (scsi_block_when_processing_errors(sdev))
+			scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
+	}
+
+	scsi_disk_put(sdkp);
+}
+
+static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+	struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
+	struct scsi_device *sdp = sdkp->device;
+	struct Scsi_Host *host = sdp->host;
+	sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
+	int diskinfo[4];
+
+	/* default to most commonly used values */
+	diskinfo[0] = 0x40;	/* 1 << 6 */
+	diskinfo[1] = 0x20;	/* 1 << 5 */
+	diskinfo[2] = capacity >> 11;
+
+	/* override with calculated, extended default, or driver values */
+	if (host->hostt->bios_param)
+		host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
+	else
+		scsicam_bios_param(bdev, capacity, diskinfo);
+
+	geo->heads = diskinfo[0];
+	geo->sectors = diskinfo[1];
+	geo->cylinders = diskinfo[2];
+	return 0;
+}
+
+/**
+ *	sd_ioctl - process an ioctl
+ *	@bdev: target block device
+ *	@mode: FMODE_* mask
+ *	@cmd: ioctl command number
+ *	@p: this is third argument given to ioctl(2) system call.
+ *	Often contains a pointer.
+ *
+ *	Returns 0 if successful (some ioctls return positive numbers on
+ *	success as well). Returns a negated errno value in case of error.
+ *
+ *	Note: most ioctls are forward onto the block subsystem or further
+ *	down in the scsi subsystem.
+ **/
+static int sd_ioctl_common(struct block_device *bdev, fmode_t mode,
+			   unsigned int cmd, void __user *p)
+{
+	struct gendisk *disk = bdev->bd_disk;
+	struct scsi_disk *sdkp = scsi_disk(disk);
+	struct scsi_device *sdp = sdkp->device;
+	int error;
+    
+	SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
+				    "cmd=0x%x\n", disk->disk_name, cmd));
+
+	error = scsi_verify_blk_ioctl(bdev, cmd);
+	if (error < 0)
+		return error;
+
+	/*
+	 * If we are in the middle of error recovery, don't let anyone
+	 * else try and use this device.  Also, if error recovery fails, it
+	 * may try and take the device offline, in which case all further
+	 * access to the device is prohibited.
+	 */
+	error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
+			(mode & FMODE_NDELAY) != 0);
+	if (error)
+		goto out;
+
+	if (is_sed_ioctl(cmd))
+		return sed_ioctl(sdkp->opal_dev, cmd, p);
+
+	/*
+	 * Send SCSI addressing ioctls directly to mid level, send other
+	 * ioctls to block level and then onto mid level if they can't be
+	 * resolved.
+	 */
+	switch (cmd) {
+		case SCSI_IOCTL_GET_IDLUN:
+		case SCSI_IOCTL_GET_BUS_NUMBER:
+			error = scsi_ioctl(sdp, cmd, p);
+			break;
+		default:
+			error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
+			break;
+	}
+out:
+	return error;
+}
+
+static void set_media_not_present(struct scsi_disk *sdkp)
+{
+	if (sdkp->media_present)
+		sdkp->device->changed = 1;
+
+	if (sdkp->device->removable) {
+		sdkp->media_present = 0;
+		sdkp->capacity = 0;
+	}
+}
+
+static int media_not_present(struct scsi_disk *sdkp,
+			     struct scsi_sense_hdr *sshdr)
+{
+	if (!scsi_sense_valid(sshdr))
+		return 0;
+
+	/* not invoked for commands that could return deferred errors */
+	switch (sshdr->sense_key) {
+	case UNIT_ATTENTION:
+	case NOT_READY:
+		/* medium not present */
+		if (sshdr->asc == 0x3A) {
+			set_media_not_present(sdkp);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+/**
+ *	sd_check_events - check media events
+ *	@disk: kernel device descriptor
+ *	@clearing: disk events currently being cleared
+ *
+ *	Returns mask of DISK_EVENT_*.
+ *
+ *	Note: this function is invoked from the block subsystem.
+ **/
+static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
+{
+	struct scsi_disk *sdkp = scsi_disk_get(disk);
+	struct scsi_device *sdp;
+	int retval;
+
+	if (!sdkp)
+		return 0;
+
+	sdp = sdkp->device;
+	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
+
+	/*
+	 * If the device is offline, don't send any commands - just pretend as
+	 * if the command failed.  If the device ever comes back online, we
+	 * can deal with it then.  It is only because of unrecoverable errors
+	 * that we would ever take a device offline in the first place.
+	 */
+	if (!scsi_device_online(sdp)) {
+		set_media_not_present(sdkp);
+		goto out;
+	}
+
+	/*
+	 * Using TEST_UNIT_READY enables differentiation between drive with
+	 * no cartridge loaded - NOT READY, drive with changed cartridge -
+	 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
+	 *
+	 * Drives that auto spin down. eg iomega jaz 1G, will be started
+	 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
+	 * sd_revalidate() is called.
+	 */
+	if (scsi_block_when_processing_errors(sdp)) {
+		struct scsi_sense_hdr sshdr = { 0, };
+
+		retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, sdkp->max_retries,
+					      &sshdr);
+
+		/* failed to execute TUR, assume media not present */
+		if (host_byte(retval)) {
+			set_media_not_present(sdkp);
+			goto out;
+		}
+
+		if (media_not_present(sdkp, &sshdr))
+			goto out;
+	}
+
+	/*
+	 * For removable scsi disk we have to recognise the presence
+	 * of a disk in the drive.
+	 */
+	if (!sdkp->media_present)
+		sdp->changed = 1;
+	sdkp->media_present = 1;
+out:
+	/*
+	 * sdp->changed is set under the following conditions:
+	 *
+	 *	Medium present state has changed in either direction.
+	 *	Device has indicated UNIT_ATTENTION.
+	 */
+	retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
+	sdp->changed = 0;
+	scsi_disk_put(sdkp);
+	return retval;
+}
+
+static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
+{
+	int retries, res;
+	struct scsi_device *sdp = sdkp->device;
+	const int timeout = sdp->request_queue->rq_timeout
+		* SD_FLUSH_TIMEOUT_MULTIPLIER;
+	struct scsi_sense_hdr my_sshdr;
+
+	if (!scsi_device_online(sdp))
+		return -ENODEV;
+
+	/* caller might not be interested in sense, but we need it */
+	if (!sshdr)
+		sshdr = &my_sshdr;
+
+	for (retries = 3; retries > 0; --retries) {
+		unsigned char cmd[10] = { 0 };
+
+		cmd[0] = SYNCHRONIZE_CACHE;
+		/*
+		 * Leave the rest of the command zero to indicate
+		 * flush everything.
+		 */
+		res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
+				timeout, sdkp->max_retries, 0, RQF_PM, NULL);
+		if (res == 0)
+			break;
+	}
+
+	if (res) {
+		sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
+
+		if (driver_byte(res) == DRIVER_SENSE)
+			sd_print_sense_hdr(sdkp, sshdr);
+
+		/* we need to evaluate the error return  */
+		if (scsi_sense_valid(sshdr) &&
+			(sshdr->asc == 0x3a ||	/* medium not present */
+			 sshdr->asc == 0x20 ||	/* invalid command */
+			 (sshdr->asc == 0x74 && sshdr->ascq == 0x71)))	/* drive is password locked */
+				/* this is no error here */
+				return 0;
+
+		switch (host_byte(res)) {
+		/* ignore errors due to racing a disconnection */
+		case DID_BAD_TARGET:
+		case DID_NO_CONNECT:
+			return 0;
+		/* signal the upper layer it might try again */
+		case DID_BUS_BUSY:
+		case DID_IMM_RETRY:
+		case DID_REQUEUE:
+		case DID_SOFT_ERROR:
+			return -EBUSY;
+		default:
+			return -EIO;
+		}
+	}
+	return 0;
+}
+
+static void sd_rescan(struct device *dev)
+{
+	struct scsi_disk *sdkp = dev_get_drvdata(dev);
+	int ret;
+
+	ret = sd_revalidate_disk(sdkp->disk);
+	revalidate_disk_size(sdkp->disk, ret == 0);
+}
+
+static int sd_ioctl(struct block_device *bdev, fmode_t mode,
+		    unsigned int cmd, unsigned long arg)
+{
+	void __user *p = (void __user *)arg;
+	int ret;
+
+	ret = sd_ioctl_common(bdev, mode, cmd, p);
+	if (ret != -ENOTTY)
+		return ret;
+
+	return scsi_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
+}
+
+#ifdef CONFIG_COMPAT
+static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
+			   unsigned int cmd, unsigned long arg)
+{
+	void __user *p = compat_ptr(arg);
+	int ret;
+
+	ret = sd_ioctl_common(bdev, mode, cmd, p);
+	if (ret != -ENOTTY)
+		return ret;
+
+	return scsi_compat_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
+}
+#endif
+
+static char sd_pr_type(enum pr_type type)
+{
+	switch (type) {
+	case PR_WRITE_EXCLUSIVE:
+		return 0x01;
+	case PR_EXCLUSIVE_ACCESS:
+		return 0x03;
+	case PR_WRITE_EXCLUSIVE_REG_ONLY:
+		return 0x05;
+	case PR_EXCLUSIVE_ACCESS_REG_ONLY:
+		return 0x06;
+	case PR_WRITE_EXCLUSIVE_ALL_REGS:
+		return 0x07;
+	case PR_EXCLUSIVE_ACCESS_ALL_REGS:
+		return 0x08;
+	default:
+		return 0;
+	}
+};
+
+static int sd_pr_command(struct block_device *bdev, u8 sa,
+		u64 key, u64 sa_key, u8 type, u8 flags)
+{
+	struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
+	struct scsi_device *sdev = sdkp->device;
+	struct scsi_sense_hdr sshdr;
+	int result;
+	u8 cmd[16] = { 0, };
+	u8 data[24] = { 0, };
+
+	cmd[0] = PERSISTENT_RESERVE_OUT;
+	cmd[1] = sa;
+	cmd[2] = type;
+	put_unaligned_be32(sizeof(data), &cmd[5]);
+
+	put_unaligned_be64(key, &data[0]);
+	put_unaligned_be64(sa_key, &data[8]);
+	data[20] = flags;
+
+	result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
+			&sshdr, SD_TIMEOUT, sdkp->max_retries, NULL);
+
+	if (driver_byte(result) == DRIVER_SENSE &&
+	    scsi_sense_valid(&sshdr)) {
+		sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
+		scsi_print_sense_hdr(sdev, NULL, &sshdr);
+	}
+
+	return result;
+}
+
+static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
+		u32 flags)
+{
+	if (flags & ~PR_FL_IGNORE_KEY)
+		return -EOPNOTSUPP;
+	return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
+			old_key, new_key, 0,
+			(1 << 0) /* APTPL */);
+}
+
+static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
+		u32 flags)
+{
+	if (flags)
+		return -EOPNOTSUPP;
+	return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
+}
+
+static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
+{
+	return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
+}
+
+static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
+		enum pr_type type, bool abort)
+{
+	return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
+			     sd_pr_type(type), 0);
+}
+
+static int sd_pr_clear(struct block_device *bdev, u64 key)
+{
+	return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
+}
+
+static const struct pr_ops sd_pr_ops = {
+	.pr_register	= sd_pr_register,
+	.pr_reserve	= sd_pr_reserve,
+	.pr_release	= sd_pr_release,
+	.pr_preempt	= sd_pr_preempt,
+	.pr_clear	= sd_pr_clear,
+};
+
+static const struct block_device_operations sd_fops = {
+	.owner			= THIS_MODULE,
+	.open			= sd_open,
+	.release		= sd_release,
+	.ioctl			= sd_ioctl,
+	.getgeo			= sd_getgeo,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl		= sd_compat_ioctl,
+#endif
+	.check_events		= sd_check_events,
+	.unlock_native_capacity	= sd_unlock_native_capacity,
+	.report_zones		= sd_zbc_report_zones,
+	.pr_ops			= &sd_pr_ops,
+};
+
+/**
+ *	sd_eh_reset - reset error handling callback
+ *	@scmd:		sd-issued command that has failed
+ *
+ *	This function is called by the SCSI midlayer before starting
+ *	SCSI EH. When counting medium access failures we have to be
+ *	careful to register it only only once per device and SCSI EH run;
+ *	there might be several timed out commands which will cause the
+ *	'max_medium_access_timeouts' counter to trigger after the first
+ *	SCSI EH run already and set the device to offline.
+ *	So this function resets the internal counter before starting SCSI EH.
+ **/
+static void sd_eh_reset(struct scsi_cmnd *scmd)
+{
+	struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
+
+	/* New SCSI EH run, reset gate variable */
+	sdkp->ignore_medium_access_errors = false;
+}
+
+/**
+ *	sd_eh_action - error handling callback
+ *	@scmd:		sd-issued command that has failed
+ *	@eh_disp:	The recovery disposition suggested by the midlayer
+ *
+ *	This function is called by the SCSI midlayer upon completion of an
+ *	error test command (currently TEST UNIT READY). The result of sending
+ *	the eh command is passed in eh_disp.  We're looking for devices that
+ *	fail medium access commands but are OK with non access commands like
+ *	test unit ready (so wrongly see the device as having a successful
+ *	recovery)
+ **/
+static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
+{
+	struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
+	struct scsi_device *sdev = scmd->device;
+
+	if (!scsi_device_online(sdev) ||
+	    !scsi_medium_access_command(scmd) ||
+	    host_byte(scmd->result) != DID_TIME_OUT ||
+	    eh_disp != SUCCESS)
+		return eh_disp;
+
+	/*
+	 * The device has timed out executing a medium access command.
+	 * However, the TEST UNIT READY command sent during error
+	 * handling completed successfully. Either the device is in the
+	 * process of recovering or has it suffered an internal failure
+	 * that prevents access to the storage medium.
+	 */
+	if (!sdkp->ignore_medium_access_errors) {
+		sdkp->medium_access_timed_out++;
+		sdkp->ignore_medium_access_errors = true;
+	}
+
+	/*
+	 * If the device keeps failing read/write commands but TEST UNIT
+	 * READY always completes successfully we assume that medium
+	 * access is no longer possible and take the device offline.
+	 */
+	if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
+		scmd_printk(KERN_ERR, scmd,
+			    "Medium access timeout failure. Offlining disk!\n");
+		mutex_lock(&sdev->state_mutex);
+		scsi_device_set_state(sdev, SDEV_OFFLINE);
+		mutex_unlock(&sdev->state_mutex);
+
+		return SUCCESS;
+	}
+
+	return eh_disp;
+}
+
+static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
+{
+	struct request *req = scmd->request;
+	struct scsi_device *sdev = scmd->device;
+	unsigned int transferred, good_bytes;
+	u64 start_lba, end_lba, bad_lba;
+
+	/*
+	 * Some commands have a payload smaller than the device logical
+	 * block size (e.g. INQUIRY on a 4K disk).
+	 */
+	if (scsi_bufflen(scmd) <= sdev->sector_size)
+		return 0;
+
+	/* Check if we have a 'bad_lba' information */
+	if (!scsi_get_sense_info_fld(scmd->sense_buffer,
+				     SCSI_SENSE_BUFFERSIZE,
+				     &bad_lba))
+		return 0;
+
+	/*
+	 * If the bad lba was reported incorrectly, we have no idea where
+	 * the error is.
+	 */
+	start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
+	end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
+	if (bad_lba < start_lba || bad_lba >= end_lba)
+		return 0;
+
+	/*
+	 * resid is optional but mostly filled in.  When it's unused,
+	 * its value is zero, so we assume the whole buffer transferred
+	 */
+	transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
+
+	/* This computation should always be done in terms of the
+	 * resolution of the device's medium.
+	 */
+	good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
+
+	return min(good_bytes, transferred);
+}
+
+/**
+ *	sd_done - bottom half handler: called when the lower level
+ *	driver has completed (successfully or otherwise) a scsi command.
+ *	@SCpnt: mid-level's per command structure.
+ *
+ *	Note: potentially run from within an ISR. Must not block.
+ **/
+static int sd_done(struct scsi_cmnd *SCpnt)
+{
+	int result = SCpnt->result;
+	unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
+	unsigned int sector_size = SCpnt->device->sector_size;
+	unsigned int resid;
+	struct scsi_sense_hdr sshdr;
+	struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
+	struct request *req = SCpnt->request;
+	int sense_valid = 0;
+	int sense_deferred = 0;
+
+	switch (req_op(req)) {
+	case REQ_OP_DISCARD:
+	case REQ_OP_WRITE_ZEROES:
+	case REQ_OP_WRITE_SAME:
+	case REQ_OP_ZONE_RESET:
+	case REQ_OP_ZONE_RESET_ALL:
+	case REQ_OP_ZONE_OPEN:
+	case REQ_OP_ZONE_CLOSE:
+	case REQ_OP_ZONE_FINISH:
+		if (!result) {
+			good_bytes = blk_rq_bytes(req);
+			scsi_set_resid(SCpnt, 0);
+		} else {
+			good_bytes = 0;
+			scsi_set_resid(SCpnt, blk_rq_bytes(req));
+		}
+		break;
+	default:
+		/*
+		 * In case of bogus fw or device, we could end up having
+		 * an unaligned partial completion. Check this here and force
+		 * alignment.
+		 */
+		resid = scsi_get_resid(SCpnt);
+		if (resid & (sector_size - 1)) {
+			sd_printk(KERN_INFO, sdkp,
+				"Unaligned partial completion (resid=%u, sector_sz=%u)\n",
+				resid, sector_size);
+			scsi_print_command(SCpnt);
+			resid = min(scsi_bufflen(SCpnt),
+				    round_up(resid, sector_size));
+			scsi_set_resid(SCpnt, resid);
+		}
+	}
+
+	if (result) {
+		sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
+		if (sense_valid)
+			sense_deferred = scsi_sense_is_deferred(&sshdr);
+	}
+	sdkp->medium_access_timed_out = 0;
+
+	if (driver_byte(result) != DRIVER_SENSE &&
+	    (!sense_valid || sense_deferred))
+		goto out;
+
+	switch (sshdr.sense_key) {
+	case HARDWARE_ERROR:
+	case MEDIUM_ERROR:
+		good_bytes = sd_completed_bytes(SCpnt);
+		break;
+	case RECOVERED_ERROR:
+		good_bytes = scsi_bufflen(SCpnt);
+		break;
+	case NO_SENSE:
+		/* This indicates a false check condition, so ignore it.  An
+		 * unknown amount of data was transferred so treat it as an
+		 * error.
+		 */
+		SCpnt->result = 0;
+		memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
+		break;
+	case ABORTED_COMMAND:
+		if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
+			good_bytes = sd_completed_bytes(SCpnt);
+		break;
+	case ILLEGAL_REQUEST:
+		switch (sshdr.asc) {
+		case 0x10:	/* DIX: Host detected corruption */
+			good_bytes = sd_completed_bytes(SCpnt);
+			break;
+		case 0x20:	/* INVALID COMMAND OPCODE */
+		case 0x24:	/* INVALID FIELD IN CDB */
+			switch (SCpnt->cmnd[0]) {
+			case UNMAP:
+				sd_config_discard(sdkp, SD_LBP_DISABLE);
+				break;
+			case WRITE_SAME_16:
+			case WRITE_SAME:
+				if (SCpnt->cmnd[1] & 8) { /* UNMAP */
+					sd_config_discard(sdkp, SD_LBP_DISABLE);
+				} else {
+					sdkp->device->no_write_same = 1;
+					sd_config_write_same(sdkp);
+					req->rq_flags |= RQF_QUIET;
+				}
+				break;
+			}
+		}
+		break;
+	default:
+		break;
+	}
+
+ out:
+	if (sd_is_zoned(sdkp))
+		good_bytes = sd_zbc_complete(SCpnt, good_bytes, &sshdr);
+
+	SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
+					   "sd_done: completed %d of %d bytes\n",
+					   good_bytes, scsi_bufflen(SCpnt)));
+
+	return good_bytes;
+}
+
+/*
+ * spinup disk - called only in sd_revalidate_disk()
+ */
+static void
+sd_spinup_disk(struct scsi_disk *sdkp)
+{
+	unsigned char cmd[10];
+	unsigned long spintime_expire = 0;
+	int retries, spintime;
+	unsigned int the_result;
+	struct scsi_sense_hdr sshdr;
+	int sense_valid = 0;
+
+	spintime = 0;
+
+	/* Spin up drives, as required.  Only do this at boot time */
+	/* Spinup needs to be done for module loads too. */
+	do {
+		retries = 0;
+
+		do {
+			cmd[0] = TEST_UNIT_READY;
+			memset((void *) &cmd[1], 0, 9);
+
+			the_result = scsi_execute_req(sdkp->device, cmd,
+						      DMA_NONE, NULL, 0,
+						      &sshdr, SD_TIMEOUT,
+						      sdkp->max_retries, NULL);
+
+			/*
+			 * If the drive has indicated to us that it
+			 * doesn't have any media in it, don't bother
+			 * with any more polling.
+			 */
+			if (media_not_present(sdkp, &sshdr))
+				return;
+
+			if (the_result)
+				sense_valid = scsi_sense_valid(&sshdr);
+			retries++;
+		} while (retries < 3 && 
+			 (!scsi_status_is_good(the_result) ||
+			  ((driver_byte(the_result) == DRIVER_SENSE) &&
+			  sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
+
+		if (driver_byte(the_result) != DRIVER_SENSE) {
+			/* no sense, TUR either succeeded or failed
+			 * with a status error */
+			if(!spintime && !scsi_status_is_good(the_result)) {
+				sd_print_result(sdkp, "Test Unit Ready failed",
+						the_result);
+			}
+			break;
+		}
+
+		/*
+		 * The device does not want the automatic start to be issued.
+		 */
+		if (sdkp->device->no_start_on_add)
+			break;
+
+		if (sense_valid && sshdr.sense_key == NOT_READY) {
+			if (sshdr.asc == 4 && sshdr.ascq == 3)
+				break;	/* manual intervention required */
+			if (sshdr.asc == 4 && sshdr.ascq == 0xb)
+				break;	/* standby */
+			if (sshdr.asc == 4 && sshdr.ascq == 0xc)
+				break;	/* unavailable */
+			if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
+				break;	/* sanitize in progress */
+			/*
+			 * Issue command to spin up drive when not ready
+			 */
+			if (!spintime) {
+				sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
+				cmd[0] = START_STOP;
+				cmd[1] = 1;	/* Return immediately */
+				memset((void *) &cmd[2], 0, 8);
+				cmd[4] = 1;	/* Start spin cycle */
+				if (sdkp->device->start_stop_pwr_cond)
+					cmd[4] |= 1 << 4;
+				scsi_execute_req(sdkp->device, cmd, DMA_NONE,
+						 NULL, 0, &sshdr,
+						 SD_TIMEOUT, sdkp->max_retries,
+						 NULL);
+				spintime_expire = jiffies + 100 * HZ;
+				spintime = 1;
+			}
+			/* Wait 1 second for next try */
+			msleep(1000);
+			printk(KERN_CONT ".");
+
+		/*
+		 * Wait for USB flash devices with slow firmware.
+		 * Yes, this sense key/ASC combination shouldn't
+		 * occur here.  It's characteristic of these devices.
+		 */
+		} else if (sense_valid &&
+				sshdr.sense_key == UNIT_ATTENTION &&
+				sshdr.asc == 0x28) {
+			if (!spintime) {
+				spintime_expire = jiffies + 5 * HZ;
+				spintime = 1;
+			}
+			/* Wait 1 second for next try */
+			msleep(1000);
+		} else {
+			/* we don't understand the sense code, so it's
+			 * probably pointless to loop */
+			if(!spintime) {
+				sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
+				sd_print_sense_hdr(sdkp, &sshdr);
+			}
+			break;
+		}
+				
+	} while (spintime && time_before_eq(jiffies, spintime_expire));
+
+	if (spintime) {
+		if (scsi_status_is_good(the_result))
+			printk(KERN_CONT "ready\n");
+		else
+			printk(KERN_CONT "not responding...\n");
+	}
+}
+
+/*
+ * Determine whether disk supports Data Integrity Field.
+ */
+static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+	struct scsi_device *sdp = sdkp->device;
+	u8 type;
+	int ret = 0;
+
+	if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
+		sdkp->protection_type = 0;
+		return ret;
+	}
+
+	type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
+
+	if (type > T10_PI_TYPE3_PROTECTION)
+		ret = -ENODEV;
+	else if (scsi_host_dif_capable(sdp->host, type))
+		ret = 1;
+
+	if (sdkp->first_scan || type != sdkp->protection_type)
+		switch (ret) {
+		case -ENODEV:
+			sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
+				  " protection type %u. Disabling disk!\n",
+				  type);
+			break;
+		case 1:
+			sd_printk(KERN_NOTICE, sdkp,
+				  "Enabling DIF Type %u protection\n", type);
+			break;
+		case 0:
+			sd_printk(KERN_NOTICE, sdkp,
+				  "Disabling DIF Type %u protection\n", type);
+			break;
+		}
+
+	sdkp->protection_type = type;
+
+	return ret;
+}
+
+static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
+			struct scsi_sense_hdr *sshdr, int sense_valid,
+			int the_result)
+{
+	if (driver_byte(the_result) == DRIVER_SENSE)
+		sd_print_sense_hdr(sdkp, sshdr);
+	else
+		sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
+
+	/*
+	 * Set dirty bit for removable devices if not ready -
+	 * sometimes drives will not report this properly.
+	 */
+	if (sdp->removable &&
+	    sense_valid && sshdr->sense_key == NOT_READY)
+		set_media_not_present(sdkp);
+
+	/*
+	 * We used to set media_present to 0 here to indicate no media
+	 * in the drive, but some drives fail read capacity even with
+	 * media present, so we can't do that.
+	 */
+	sdkp->capacity = 0; /* unknown mapped to zero - as usual */
+}
+
+#define RC16_LEN 32
+#if RC16_LEN > SD_BUF_SIZE
+#error RC16_LEN must not be more than SD_BUF_SIZE
+#endif
+
+#define READ_CAPACITY_RETRIES_ON_RESET	10
+
+static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
+						unsigned char *buffer)
+{
+	unsigned char cmd[16];
+	struct scsi_sense_hdr sshdr;
+	int sense_valid = 0;
+	int the_result;
+	int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
+	unsigned int alignment;
+	unsigned long long lba;
+	unsigned sector_size;
+
+	if (sdp->no_read_capacity_16)
+		return -EINVAL;
+
+	do {
+		memset(cmd, 0, 16);
+		cmd[0] = SERVICE_ACTION_IN_16;
+		cmd[1] = SAI_READ_CAPACITY_16;
+		cmd[13] = RC16_LEN;
+		memset(buffer, 0, RC16_LEN);
+
+		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
+					buffer, RC16_LEN, &sshdr,
+					SD_TIMEOUT, sdkp->max_retries, NULL);
+
+		if (media_not_present(sdkp, &sshdr))
+			return -ENODEV;
+
+		if (the_result) {
+			sense_valid = scsi_sense_valid(&sshdr);
+			if (sense_valid &&
+			    sshdr.sense_key == ILLEGAL_REQUEST &&
+			    (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
+			    sshdr.ascq == 0x00)
+				/* Invalid Command Operation Code or
+				 * Invalid Field in CDB, just retry
+				 * silently with RC10 */
+				return -EINVAL;
+			if (sense_valid &&
+			    sshdr.sense_key == UNIT_ATTENTION &&
+			    sshdr.asc == 0x29 && sshdr.ascq == 0x00)
+				/* Device reset might occur several times,
+				 * give it one more chance */
+				if (--reset_retries > 0)
+					continue;
+		}
+		retries--;
+
+	} while (the_result && retries);
+
+	if (the_result) {
+		sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
+		read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
+		return -EINVAL;
+	}
+
+	sector_size = get_unaligned_be32(&buffer[8]);
+	lba = get_unaligned_be64(&buffer[0]);
+
+	if (sd_read_protection_type(sdkp, buffer) < 0) {
+		sdkp->capacity = 0;
+		return -ENODEV;
+	}
+
+	/* Logical blocks per physical block exponent */
+	sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
+
+	/* RC basis */
+	sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
+
+	/* Lowest aligned logical block */
+	alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
+	blk_queue_alignment_offset(sdp->request_queue, alignment);
+	if (alignment && sdkp->first_scan)
+		sd_printk(KERN_NOTICE, sdkp,
+			  "physical block alignment offset: %u\n", alignment);
+
+	if (buffer[14] & 0x80) { /* LBPME */
+		sdkp->lbpme = 1;
+
+		if (buffer[14] & 0x40) /* LBPRZ */
+			sdkp->lbprz = 1;
+
+		sd_config_discard(sdkp, SD_LBP_WS16);
+	}
+
+	sdkp->capacity = lba + 1;
+	return sector_size;
+}
+
+static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
+						unsigned char *buffer)
+{
+	unsigned char cmd[16];
+	struct scsi_sense_hdr sshdr;
+	int sense_valid = 0;
+	int the_result;
+	int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
+	sector_t lba;
+	unsigned sector_size;
+
+	do {
+		cmd[0] = READ_CAPACITY;
+		memset(&cmd[1], 0, 9);
+		memset(buffer, 0, 8);
+
+		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
+					buffer, 8, &sshdr,
+					SD_TIMEOUT, sdkp->max_retries, NULL);
+
+		if (media_not_present(sdkp, &sshdr))
+			return -ENODEV;
+
+		if (the_result) {
+			sense_valid = scsi_sense_valid(&sshdr);
+			if (sense_valid &&
+			    sshdr.sense_key == UNIT_ATTENTION &&
+			    sshdr.asc == 0x29 && sshdr.ascq == 0x00)
+				/* Device reset might occur several times,
+				 * give it one more chance */
+				if (--reset_retries > 0)
+					continue;
+		}
+		retries--;
+
+	} while (the_result && retries);
+
+	if (the_result) {
+		sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
+		read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
+		return -EINVAL;
+	}
+
+	sector_size = get_unaligned_be32(&buffer[4]);
+	lba = get_unaligned_be32(&buffer[0]);
+
+	if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
+		/* Some buggy (usb cardreader) devices return an lba of
+		   0xffffffff when the want to report a size of 0 (with
+		   which they really mean no media is present) */
+		sdkp->capacity = 0;
+		sdkp->physical_block_size = sector_size;
+		return sector_size;
+	}
+
+	sdkp->capacity = lba + 1;
+	sdkp->physical_block_size = sector_size;
+	return sector_size;
+}
+
+static int sd_try_rc16_first(struct scsi_device *sdp)
+{
+	if (sdp->host->max_cmd_len < 16)
+		return 0;
+	if (sdp->try_rc_10_first)
+		return 0;
+	if (sdp->scsi_level > SCSI_SPC_2)
+		return 1;
+	if (scsi_device_protection(sdp))
+		return 1;
+	return 0;
+}
+
+/*
+ * read disk capacity
+ */
+static void
+sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+	int sector_size;
+	struct scsi_device *sdp = sdkp->device;
+
+	if (sd_try_rc16_first(sdp)) {
+		sector_size = read_capacity_16(sdkp, sdp, buffer);
+		if (sector_size == -EOVERFLOW)
+			goto got_data;
+		if (sector_size == -ENODEV)
+			return;
+		if (sector_size < 0)
+			sector_size = read_capacity_10(sdkp, sdp, buffer);
+		if (sector_size < 0)
+			return;
+	} else {
+		sector_size = read_capacity_10(sdkp, sdp, buffer);
+		if (sector_size == -EOVERFLOW)
+			goto got_data;
+		if (sector_size < 0)
+			return;
+		if ((sizeof(sdkp->capacity) > 4) &&
+		    (sdkp->capacity > 0xffffffffULL)) {
+			int old_sector_size = sector_size;
+			sd_printk(KERN_NOTICE, sdkp, "Very big device. "
+					"Trying to use READ CAPACITY(16).\n");
+			sector_size = read_capacity_16(sdkp, sdp, buffer);
+			if (sector_size < 0) {
+				sd_printk(KERN_NOTICE, sdkp,
+					"Using 0xffffffff as device size\n");
+				sdkp->capacity = 1 + (sector_t) 0xffffffff;
+				sector_size = old_sector_size;
+				goto got_data;
+			}
+			/* Remember that READ CAPACITY(16) succeeded */
+			sdp->try_rc_10_first = 0;
+		}
+	}
+
+	/* Some devices are known to return the total number of blocks,
+	 * not the highest block number.  Some devices have versions
+	 * which do this and others which do not.  Some devices we might
+	 * suspect of doing this but we don't know for certain.
+	 *
+	 * If we know the reported capacity is wrong, decrement it.  If
+	 * we can only guess, then assume the number of blocks is even
+	 * (usually true but not always) and err on the side of lowering
+	 * the capacity.
+	 */
+	if (sdp->fix_capacity ||
+	    (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
+		sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
+				"from its reported value: %llu\n",
+				(unsigned long long) sdkp->capacity);
+		--sdkp->capacity;
+	}
+
+got_data:
+	if (sector_size == 0) {
+		sector_size = 512;
+		sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
+			  "assuming 512.\n");
+	}
+
+	if (sector_size != 512 &&
+	    sector_size != 1024 &&
+	    sector_size != 2048 &&
+	    sector_size != 4096) {
+		sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
+			  sector_size);
+		/*
+		 * The user might want to re-format the drive with
+		 * a supported sectorsize.  Once this happens, it
+		 * would be relatively trivial to set the thing up.
+		 * For this reason, we leave the thing in the table.
+		 */
+		sdkp->capacity = 0;
+		/*
+		 * set a bogus sector size so the normal read/write
+		 * logic in the block layer will eventually refuse any
+		 * request on this device without tripping over power
+		 * of two sector size assumptions
+		 */
+		sector_size = 512;
+	}
+	blk_queue_logical_block_size(sdp->request_queue, sector_size);
+	blk_queue_physical_block_size(sdp->request_queue,
+				      sdkp->physical_block_size);
+	sdkp->device->sector_size = sector_size;
+
+	if (sdkp->capacity > 0xffffffff)
+		sdp->use_16_for_rw = 1;
+
+}
+
+/*
+ * Print disk capacity
+ */
+static void
+sd_print_capacity(struct scsi_disk *sdkp,
+		  sector_t old_capacity)
+{
+	int sector_size = sdkp->device->sector_size;
+	char cap_str_2[10], cap_str_10[10];
+
+	if (!sdkp->first_scan && old_capacity == sdkp->capacity)
+		return;
+
+	string_get_size(sdkp->capacity, sector_size,
+			STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
+	string_get_size(sdkp->capacity, sector_size,
+			STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
+
+	sd_printk(KERN_NOTICE, sdkp,
+		  "%llu %d-byte logical blocks: (%s/%s)\n",
+		  (unsigned long long)sdkp->capacity,
+		  sector_size, cap_str_10, cap_str_2);
+
+	if (sdkp->physical_block_size != sector_size)
+		sd_printk(KERN_NOTICE, sdkp,
+			  "%u-byte physical blocks\n",
+			  sdkp->physical_block_size);
+}
+
+/* called with buffer of length 512 */
+static inline int
+sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage,
+		 unsigned char *buffer, int len, struct scsi_mode_data *data,
+		 struct scsi_sense_hdr *sshdr)
+{
+	return scsi_mode_sense(sdkp->device, dbd, modepage, buffer, len,
+			       SD_TIMEOUT, sdkp->max_retries, data,
+			       sshdr);
+}
+
+/*
+ * read write protect setting, if possible - called only in sd_revalidate_disk()
+ * called with buffer of length SD_BUF_SIZE
+ */
+static void
+sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+	int res;
+	struct scsi_device *sdp = sdkp->device;
+	struct scsi_mode_data data;
+	int old_wp = sdkp->write_prot;
+
+	set_disk_ro(sdkp->disk, 0);
+	if (sdp->skip_ms_page_3f) {
+		sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
+		return;
+	}
+
+	if (sdp->use_192_bytes_for_3f) {
+		res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 192, &data, NULL);
+	} else {
+		/*
+		 * First attempt: ask for all pages (0x3F), but only 4 bytes.
+		 * We have to start carefully: some devices hang if we ask
+		 * for more than is available.
+		 */
+		res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 4, &data, NULL);
+
+		/*
+		 * Second attempt: ask for page 0 When only page 0 is
+		 * implemented, a request for page 3F may return Sense Key
+		 * 5: Illegal Request, Sense Code 24: Invalid field in
+		 * CDB.
+		 */
+		if (res < 0)
+			res = sd_do_mode_sense(sdkp, 0, 0, buffer, 4, &data, NULL);
+
+		/*
+		 * Third attempt: ask 255 bytes, as we did earlier.
+		 */
+		if (res < 0)
+			res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 255,
+					       &data, NULL);
+	}
+
+	if (res < 0) {
+		sd_first_printk(KERN_WARNING, sdkp,
+			  "Test WP failed, assume Write Enabled\n");
+	} else {
+		sdkp->write_prot = ((data.device_specific & 0x80) != 0);
+		set_disk_ro(sdkp->disk, sdkp->write_prot);
+		if (sdkp->first_scan || old_wp != sdkp->write_prot) {
+			sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
+				  sdkp->write_prot ? "on" : "off");
+			sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
+		}
+	}
+}
+
+/*
+ * sd_read_cache_type - called only from sd_revalidate_disk()
+ * called with buffer of length SD_BUF_SIZE
+ */
+static void
+sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+	int len = 0, res;
+	struct scsi_device *sdp = sdkp->device;
+
+	int dbd;
+	int modepage;
+	int first_len;
+	struct scsi_mode_data data;
+	struct scsi_sense_hdr sshdr;
+	int old_wce = sdkp->WCE;
+	int old_rcd = sdkp->RCD;
+	int old_dpofua = sdkp->DPOFUA;
+
+
+	if (sdkp->cache_override)
+		return;
+
+	first_len = 4;
+	if (sdp->skip_ms_page_8) {
+		if (sdp->type == TYPE_RBC)
+			goto defaults;
+		else {
+			if (sdp->skip_ms_page_3f)
+				goto defaults;
+			modepage = 0x3F;
+			if (sdp->use_192_bytes_for_3f)
+				first_len = 192;
+			dbd = 0;
+		}
+	} else if (sdp->type == TYPE_RBC) {
+		modepage = 6;
+		dbd = 8;
+	} else {
+		modepage = 8;
+		dbd = 0;
+	}
+
+	/* cautiously ask */
+	res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, first_len,
+			&data, &sshdr);
+
+	if (res < 0)
+		goto bad_sense;
+
+	if (!data.header_length) {
+		modepage = 6;
+		first_len = 0;
+		sd_first_printk(KERN_ERR, sdkp,
+				"Missing header in MODE_SENSE response\n");
+	}
+
+	/* that went OK, now ask for the proper length */
+	len = data.length;
+
+	/*
+	 * We're only interested in the first three bytes, actually.
+	 * But the data cache page is defined for the first 20.
+	 */
+	if (len < 3)
+		goto bad_sense;
+	else if (len > SD_BUF_SIZE) {
+		sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
+			  "data from %d to %d bytes\n", len, SD_BUF_SIZE);
+		len = SD_BUF_SIZE;
+	}
+	if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
+		len = 192;
+
+	/* Get the data */
+	if (len > first_len)
+		res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len,
+				&data, &sshdr);
+
+	if (!res) {
+		int offset = data.header_length + data.block_descriptor_length;
+
+		while (offset < len) {
+			u8 page_code = buffer[offset] & 0x3F;
+			u8 spf       = buffer[offset] & 0x40;
+
+			if (page_code == 8 || page_code == 6) {
+				/* We're interested only in the first 3 bytes.
+				 */
+				if (len - offset <= 2) {
+					sd_first_printk(KERN_ERR, sdkp,
+						"Incomplete mode parameter "
+							"data\n");
+					goto defaults;
+				} else {
+					modepage = page_code;
+					goto Page_found;
+				}
+			} else {
+				/* Go to the next page */
+				if (spf && len - offset > 3)
+					offset += 4 + (buffer[offset+2] << 8) +
+						buffer[offset+3];
+				else if (!spf && len - offset > 1)
+					offset += 2 + buffer[offset+1];
+				else {
+					sd_first_printk(KERN_ERR, sdkp,
+							"Incomplete mode "
+							"parameter data\n");
+					goto defaults;
+				}
+			}
+		}
+
+		sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
+		goto defaults;
+
+	Page_found:
+		if (modepage == 8) {
+			sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
+			sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
+		} else {
+			sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
+			sdkp->RCD = 0;
+		}
+
+		sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
+		if (sdp->broken_fua) {
+			sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
+			sdkp->DPOFUA = 0;
+		} else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
+			   !sdkp->device->use_16_for_rw) {
+			sd_first_printk(KERN_NOTICE, sdkp,
+				  "Uses READ/WRITE(6), disabling FUA\n");
+			sdkp->DPOFUA = 0;
+		}
+
+		/* No cache flush allowed for write protected devices */
+		if (sdkp->WCE && sdkp->write_prot)
+			sdkp->WCE = 0;
+
+		if (sdkp->first_scan || old_wce != sdkp->WCE ||
+		    old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
+			sd_printk(KERN_NOTICE, sdkp,
+				  "Write cache: %s, read cache: %s, %s\n",
+				  sdkp->WCE ? "enabled" : "disabled",
+				  sdkp->RCD ? "disabled" : "enabled",
+				  sdkp->DPOFUA ? "supports DPO and FUA"
+				  : "doesn't support DPO or FUA");
+
+		return;
+	}
+
+bad_sense:
+	if (scsi_sense_valid(&sshdr) &&
+	    sshdr.sense_key == ILLEGAL_REQUEST &&
+	    sshdr.asc == 0x24 && sshdr.ascq == 0x0)
+		/* Invalid field in CDB */
+		sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
+	else
+		sd_first_printk(KERN_ERR, sdkp,
+				"Asking for cache data failed\n");
+
+defaults:
+	if (sdp->wce_default_on) {
+		sd_first_printk(KERN_NOTICE, sdkp,
+				"Assuming drive cache: write back\n");
+		sdkp->WCE = 1;
+	} else {
+		sd_first_printk(KERN_ERR, sdkp,
+				"Assuming drive cache: write through\n");
+		sdkp->WCE = 0;
+	}
+	sdkp->RCD = 0;
+	sdkp->DPOFUA = 0;
+}
+
+/*
+ * The ATO bit indicates whether the DIF application tag is available
+ * for use by the operating system.
+ */
+static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+	int res, offset;
+	struct scsi_device *sdp = sdkp->device;
+	struct scsi_mode_data data;
+	struct scsi_sense_hdr sshdr;
+
+	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
+		return;
+
+	if (sdkp->protection_type == 0)
+		return;
+
+	res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
+			      sdkp->max_retries, &data, &sshdr);
+
+	if (res < 0 || !data.header_length ||
+	    data.length < 6) {
+		sd_first_printk(KERN_WARNING, sdkp,
+			  "getting Control mode page failed, assume no ATO\n");
+
+		if (scsi_sense_valid(&sshdr))
+			sd_print_sense_hdr(sdkp, &sshdr);
+
+		return;
+	}
+
+	offset = data.header_length + data.block_descriptor_length;
+
+	if ((buffer[offset] & 0x3f) != 0x0a) {
+		sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
+		return;
+	}
+
+	if ((buffer[offset + 5] & 0x80) == 0)
+		return;
+
+	sdkp->ATO = 1;
+
+	return;
+}
+
+/**
+ * sd_read_block_limits - Query disk device for preferred I/O sizes.
+ * @sdkp: disk to query
+ */
+static void sd_read_block_limits(struct scsi_disk *sdkp)
+{
+	unsigned int sector_sz = sdkp->device->sector_size;
+	const int vpd_len = 64;
+	unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
+
+	if (!buffer ||
+	    /* Block Limits VPD */
+	    scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
+		goto out;
+
+	blk_queue_io_min(sdkp->disk->queue,
+			 get_unaligned_be16(&buffer[6]) * sector_sz);
+
+	sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
+	sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
+
+	if (buffer[3] == 0x3c) {
+		unsigned int lba_count, desc_count;
+
+		sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
+
+		if (!sdkp->lbpme)
+			goto out;
+
+		lba_count = get_unaligned_be32(&buffer[20]);
+		desc_count = get_unaligned_be32(&buffer[24]);
+
+		if (lba_count && desc_count)
+			sdkp->max_unmap_blocks = lba_count;
+
+		sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
+
+		if (buffer[32] & 0x80)
+			sdkp->unmap_alignment =
+				get_unaligned_be32(&buffer[32]) & ~(1 << 31);
+
+		if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
+
+			if (sdkp->max_unmap_blocks)
+				sd_config_discard(sdkp, SD_LBP_UNMAP);
+			else
+				sd_config_discard(sdkp, SD_LBP_WS16);
+
+		} else {	/* LBP VPD page tells us what to use */
+			if (sdkp->lbpu && sdkp->max_unmap_blocks)
+				sd_config_discard(sdkp, SD_LBP_UNMAP);
+			else if (sdkp->lbpws)
+				sd_config_discard(sdkp, SD_LBP_WS16);
+			else if (sdkp->lbpws10)
+				sd_config_discard(sdkp, SD_LBP_WS10);
+			else
+				sd_config_discard(sdkp, SD_LBP_DISABLE);
+		}
+	}
+
+ out:
+	kfree(buffer);
+}
+
+/**
+ * sd_read_block_characteristics - Query block dev. characteristics
+ * @sdkp: disk to query
+ */
+static void sd_read_block_characteristics(struct scsi_disk *sdkp)
+{
+	struct request_queue *q = sdkp->disk->queue;
+	unsigned char *buffer;
+	u16 rot;
+	const int vpd_len = 64;
+
+	buffer = kmalloc(vpd_len, GFP_KERNEL);
+
+	if (!buffer ||
+	    /* Block Device Characteristics VPD */
+	    scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
+		goto out;
+
+	rot = get_unaligned_be16(&buffer[4]);
+
+	if (rot == 1) {
+		blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
+		blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
+	}
+
+	if (sdkp->device->type == TYPE_ZBC) {
+		/* Host-managed */
+		blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HM);
+	} else {
+		sdkp->zoned = (buffer[8] >> 4) & 3;
+		if (sdkp->zoned == 1) {
+			/* Host-aware */
+			blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HA);
+		} else {
+			/* Regular disk or drive managed disk */
+			blk_queue_set_zoned(sdkp->disk, BLK_ZONED_NONE);
+		}
+	}
+
+	if (!sdkp->first_scan)
+		goto out;
+
+	if (blk_queue_is_zoned(q)) {
+		sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
+		      q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
+	} else {
+		if (sdkp->zoned == 1)
+			sd_printk(KERN_NOTICE, sdkp,
+				  "Host-aware SMR disk used as regular disk\n");
+		else if (sdkp->zoned == 2)
+			sd_printk(KERN_NOTICE, sdkp,
+				  "Drive-managed SMR disk\n");
+	}
+
+ out:
+	kfree(buffer);
+}
+
+/**
+ * sd_read_block_provisioning - Query provisioning VPD page
+ * @sdkp: disk to query
+ */
+static void sd_read_block_provisioning(struct scsi_disk *sdkp)
+{
+	unsigned char *buffer;
+	const int vpd_len = 8;
+
+	if (sdkp->lbpme == 0)
+		return;
+
+	buffer = kmalloc(vpd_len, GFP_KERNEL);
+
+	if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
+		goto out;
+
+	sdkp->lbpvpd	= 1;
+	sdkp->lbpu	= (buffer[5] >> 7) & 1;	/* UNMAP */
+	sdkp->lbpws	= (buffer[5] >> 6) & 1;	/* WRITE SAME(16) with UNMAP */
+	sdkp->lbpws10	= (buffer[5] >> 5) & 1;	/* WRITE SAME(10) with UNMAP */
+
+ out:
+	kfree(buffer);
+}
+
+static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+	struct scsi_device *sdev = sdkp->device;
+
+	if (sdev->host->no_write_same) {
+		sdev->no_write_same = 1;
+
+		return;
+	}
+
+	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
+		/* too large values might cause issues with arcmsr */
+		int vpd_buf_len = 64;
+
+		sdev->no_report_opcodes = 1;
+
+		/* Disable WRITE SAME if REPORT SUPPORTED OPERATION
+		 * CODES is unsupported and the device has an ATA
+		 * Information VPD page (SAT).
+		 */
+		if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
+			sdev->no_write_same = 1;
+	}
+
+	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
+		sdkp->ws16 = 1;
+
+	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
+		sdkp->ws10 = 1;
+}
+
+static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+	struct scsi_device *sdev = sdkp->device;
+
+	if (!sdev->security_supported)
+		return;
+
+	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
+			SECURITY_PROTOCOL_IN) == 1 &&
+	    scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
+			SECURITY_PROTOCOL_OUT) == 1)
+		sdkp->security = 1;
+}
+
+/*
+ * Determine the device's preferred I/O size for reads and writes
+ * unless the reported value is unreasonably small, large, not a
+ * multiple of the physical block size, or simply garbage.
+ */
+static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
+				      unsigned int dev_max)
+{
+	struct scsi_device *sdp = sdkp->device;
+	unsigned int opt_xfer_bytes =
+		logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
+
+	if (sdkp->opt_xfer_blocks == 0)
+		return false;
+
+	if (sdkp->opt_xfer_blocks > dev_max) {
+		sd_first_printk(KERN_WARNING, sdkp,
+				"Optimal transfer size %u logical blocks " \
+				"> dev_max (%u logical blocks)\n",
+				sdkp->opt_xfer_blocks, dev_max);
+		return false;
+	}
+
+	if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
+		sd_first_printk(KERN_WARNING, sdkp,
+				"Optimal transfer size %u logical blocks " \
+				"> sd driver limit (%u logical blocks)\n",
+				sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
+		return false;
+	}
+
+	if (opt_xfer_bytes < PAGE_SIZE) {
+		sd_first_printk(KERN_WARNING, sdkp,
+				"Optimal transfer size %u bytes < " \
+				"PAGE_SIZE (%u bytes)\n",
+				opt_xfer_bytes, (unsigned int)PAGE_SIZE);
+		return false;
+	}
+
+	if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
+		sd_first_printk(KERN_WARNING, sdkp,
+				"Optimal transfer size %u bytes not a " \
+				"multiple of physical block size (%u bytes)\n",
+				opt_xfer_bytes, sdkp->physical_block_size);
+		return false;
+	}
+
+	sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
+			opt_xfer_bytes);
+	return true;
+}
+
+/**
+ *	sd_revalidate_disk - called the first time a new disk is seen,
+ *	performs disk spin up, read_capacity, etc.
+ *	@disk: struct gendisk we care about
+ **/
+static int sd_revalidate_disk(struct gendisk *disk)
+{
+	struct scsi_disk *sdkp = scsi_disk(disk);
+	struct scsi_device *sdp = sdkp->device;
+	struct request_queue *q = sdkp->disk->queue;
+	sector_t old_capacity = sdkp->capacity;
+	unsigned char *buffer;
+	unsigned int dev_max, rw_max;
+
+	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
+				      "sd_revalidate_disk\n"));
+
+	/*
+	 * If the device is offline, don't try and read capacity or any
+	 * of the other niceties.
+	 */
+	if (!scsi_device_online(sdp))
+		goto out;
+
+	buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
+	if (!buffer) {
+		sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
+			  "allocation failure.\n");
+		goto out;
+	}
+
+	sd_spinup_disk(sdkp);
+
+	/*
+	 * Without media there is no reason to ask; moreover, some devices
+	 * react badly if we do.
+	 */
+	if (sdkp->media_present) {
+		sd_read_capacity(sdkp, buffer);
+
+		/*
+		 * set the default to rotational.  All non-rotational devices
+		 * support the block characteristics VPD page, which will
+		 * cause this to be updated correctly and any device which
+		 * doesn't support it should be treated as rotational.
+		 */
+		blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
+		blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
+
+		if (scsi_device_supports_vpd(sdp)) {
+			sd_read_block_provisioning(sdkp);
+			sd_read_block_limits(sdkp);
+			sd_read_block_characteristics(sdkp);
+			sd_zbc_read_zones(sdkp, buffer);
+		}
+
+		sd_print_capacity(sdkp, old_capacity);
+
+		sd_read_write_protect_flag(sdkp, buffer);
+		sd_read_cache_type(sdkp, buffer);
+		sd_read_app_tag_own(sdkp, buffer);
+		sd_read_write_same(sdkp, buffer);
+		sd_read_security(sdkp, buffer);
+	}
+
+	/*
+	 * We now have all cache related info, determine how we deal
+	 * with flush requests.
+	 */
+	sd_set_flush_flag(sdkp);
+
+	/* Initial block count limit based on CDB TRANSFER LENGTH field size. */
+	dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
+
+	/* Some devices report a maximum block count for READ/WRITE requests. */
+	dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
+	q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
+
+	if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
+		q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
+		rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
+	} else {
+		q->limits.io_opt = 0;
+		rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
+				      (sector_t)BLK_DEF_MAX_SECTORS);
+	}
+
+	/* Do not exceed controller limit */
+	rw_max = min(rw_max, queue_max_hw_sectors(q));
+
+	/*
+	 * Only update max_sectors if previously unset or if the current value
+	 * exceeds the capabilities of the hardware.
+	 */
+	if (sdkp->first_scan ||
+	    q->limits.max_sectors > q->limits.max_dev_sectors ||
+	    q->limits.max_sectors > q->limits.max_hw_sectors)
+		q->limits.max_sectors = rw_max;
+
+	sdkp->first_scan = 0;
+
+	set_capacity_revalidate_and_notify(disk,
+		logical_to_sectors(sdp, sdkp->capacity), false);
+	sd_config_write_same(sdkp);
+	kfree(buffer);
+
+	/*
+	 * For a zoned drive, revalidating the zones can be done only once
+	 * the gendisk capacity is set. So if this fails, set back the gendisk
+	 * capacity to 0.
+	 */
+	if (sd_zbc_revalidate_zones(sdkp))
+		set_capacity_revalidate_and_notify(disk, 0, false);
+
+ out:
+	return 0;
+}
+
+/**
+ *	sd_unlock_native_capacity - unlock native capacity
+ *	@disk: struct gendisk to set capacity for
+ *
+ *	Block layer calls this function if it detects that partitions
+ *	on @disk reach beyond the end of the device.  If the SCSI host
+ *	implements ->unlock_native_capacity() method, it's invoked to
+ *	give it a chance to adjust the device capacity.
+ *
+ *	CONTEXT:
+ *	Defined by block layer.  Might sleep.
+ */
+static void sd_unlock_native_capacity(struct gendisk *disk)
+{
+	struct scsi_device *sdev = scsi_disk(disk)->device;
+
+	if (sdev->host->hostt->unlock_native_capacity)
+		sdev->host->hostt->unlock_native_capacity(sdev);
+}
+
+/**
+ *	sd_format_disk_name - format disk name
+ *	@prefix: name prefix - ie. "sd" for SCSI disks
+ *	@index: index of the disk to format name for
+ *	@buf: output buffer
+ *	@buflen: length of the output buffer
+ *
+ *	SCSI disk names starts at sda.  The 26th device is sdz and the
+ *	27th is sdaa.  The last one for two lettered suffix is sdzz
+ *	which is followed by sdaaa.
+ *
+ *	This is basically 26 base counting with one extra 'nil' entry
+ *	at the beginning from the second digit on and can be
+ *	determined using similar method as 26 base conversion with the
+ *	index shifted -1 after each digit is computed.
+ *
+ *	CONTEXT:
+ *	Don't care.
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
+{
+	const int base = 'z' - 'a' + 1;
+	char *begin = buf + strlen(prefix);
+	char *end = buf + buflen;
+	char *p;
+	int unit;
+
+	p = end - 1;
+	*p = '\0';
+	unit = base;
+	do {
+		if (p == begin)
+			return -EINVAL;
+		*--p = 'a' + (index % unit);
+		index = (index / unit) - 1;
+	} while (index >= 0);
+
+	memmove(begin, p, end - p);
+	memcpy(buf, prefix, strlen(prefix));
+
+	return 0;
+}
+
+/**
+ *	sd_probe - called during driver initialization and whenever a
+ *	new scsi device is attached to the system. It is called once
+ *	for each scsi device (not just disks) present.
+ *	@dev: pointer to device object
+ *
+ *	Returns 0 if successful (or not interested in this scsi device 
+ *	(e.g. scanner)); 1 when there is an error.
+ *
+ *	Note: this function is invoked from the scsi mid-level.
+ *	This function sets up the mapping between a given 
+ *	<host,channel,id,lun> (found in sdp) and new device name 
+ *	(e.g. /dev/sda). More precisely it is the block device major 
+ *	and minor number that is chosen here.
+ *
+ *	Assume sd_probe is not re-entrant (for time being)
+ *	Also think about sd_probe() and sd_remove() running coincidentally.
+ **/
+static int sd_probe(struct device *dev)
+{
+	struct scsi_device *sdp = to_scsi_device(dev);
+	struct scsi_disk *sdkp;
+	struct gendisk *gd;
+	int index;
+	int error;
+
+	scsi_autopm_get_device(sdp);
+	error = -ENODEV;
+	if (sdp->type != TYPE_DISK &&
+	    sdp->type != TYPE_ZBC &&
+	    sdp->type != TYPE_MOD &&
+	    sdp->type != TYPE_RBC)
+		goto out;
+
+#ifndef CONFIG_BLK_DEV_ZONED
+	if (sdp->type == TYPE_ZBC)
+		goto out;
+#endif
+	SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
+					"sd_probe\n"));
+
+	error = -ENOMEM;
+	sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
+	if (!sdkp)
+		goto out;
+
+	gd = alloc_disk(SD_MINORS);
+	if (!gd)
+		goto out_free;
+
+	index = ida_alloc(&sd_index_ida, GFP_KERNEL);
+	if (index < 0) {
+		sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
+		goto out_put;
+	}
+
+	error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
+	if (error) {
+		sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
+		goto out_free_index;
+	}
+
+	sdkp->device = sdp;
+	sdkp->driver = &sd_template;
+	sdkp->disk = gd;
+	sdkp->index = index;
+	sdkp->max_retries = SD_MAX_RETRIES;
+	atomic_set(&sdkp->openers, 0);
+	atomic_set(&sdkp->device->ioerr_cnt, 0);
+
+	if (!sdp->request_queue->rq_timeout) {
+		if (sdp->type != TYPE_MOD)
+			blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
+		else
+			blk_queue_rq_timeout(sdp->request_queue,
+					     SD_MOD_TIMEOUT);
+	}
+
+	device_initialize(&sdkp->dev);
+	sdkp->dev.parent = get_device(dev);
+	sdkp->dev.class = &sd_disk_class;
+	dev_set_name(&sdkp->dev, "%s", dev_name(dev));
+
+	error = device_add(&sdkp->dev);
+	if (error) {
+		put_device(&sdkp->dev);
+		goto out;
+	}
+
+	dev_set_drvdata(dev, sdkp);
+
+	gd->major = sd_major((index & 0xf0) >> 4);
+	gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
+
+	gd->fops = &sd_fops;
+	gd->private_data = &sdkp->driver;
+	gd->queue = sdkp->device->request_queue;
+
+	/* defaults, until the device tells us otherwise */
+	sdp->sector_size = 512;
+	sdkp->capacity = 0;
+	sdkp->media_present = 1;
+	sdkp->write_prot = 0;
+	sdkp->cache_override = 0;
+	sdkp->WCE = 0;
+	sdkp->RCD = 0;
+	sdkp->ATO = 0;
+	sdkp->first_scan = 1;
+	sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
+
+	sd_revalidate_disk(gd);
+
+	gd->flags = GENHD_FL_EXT_DEVT;
+	if (sdp->removable) {
+		gd->flags |= GENHD_FL_REMOVABLE;
+		gd->events |= DISK_EVENT_MEDIA_CHANGE;
+		gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
+	}
+
+	blk_pm_runtime_init(sdp->request_queue, dev);
+	if (sdp->rpm_autosuspend) {
+		pm_runtime_set_autosuspend_delay(dev,
+			sdp->host->hostt->rpm_autosuspend_delay);
+	}
+	device_add_disk(dev, gd, NULL);
+	if (sdkp->capacity)
+		sd_dif_config_host(sdkp);
+
+	sd_revalidate_disk(gd);
+
+	if (sdkp->security) {
+		sdkp->opal_dev = init_opal_dev(sdkp, &sd_sec_submit);
+		if (sdkp->opal_dev)
+			sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
+	}
+
+	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
+		  sdp->removable ? "removable " : "");
+	scsi_autopm_put_device(sdp);
+
+	return 0;
+
+ out_free_index:
+	ida_free(&sd_index_ida, index);
+ out_put:
+	put_disk(gd);
+ out_free:
+	kfree(sdkp);
+ out:
+	scsi_autopm_put_device(sdp);
+	return error;
+}
+
+/**
+ *	sd_remove - called whenever a scsi disk (previously recognized by
+ *	sd_probe) is detached from the system. It is called (potentially
+ *	multiple times) during sd module unload.
+ *	@dev: pointer to device object
+ *
+ *	Note: this function is invoked from the scsi mid-level.
+ *	This function potentially frees up a device name (e.g. /dev/sdc)
+ *	that could be re-used by a subsequent sd_probe().
+ *	This function is not called when the built-in sd driver is "exit-ed".
+ **/
+static int sd_remove(struct device *dev)
+{
+	struct scsi_disk *sdkp;
+	dev_t devt;
+
+	sdkp = dev_get_drvdata(dev);
+	devt = disk_devt(sdkp->disk);
+	scsi_autopm_get_device(sdkp->device);
+
+	async_synchronize_full_domain(&scsi_sd_pm_domain);
+	device_del(&sdkp->dev);
+	del_gendisk(sdkp->disk);
+	sd_shutdown(dev);
+
+	free_opal_dev(sdkp->opal_dev);
+
+	blk_register_region(devt, SD_MINORS, NULL,
+			    sd_default_probe, NULL, NULL);
+
+	mutex_lock(&sd_ref_mutex);
+	dev_set_drvdata(dev, NULL);
+	put_device(&sdkp->dev);
+	mutex_unlock(&sd_ref_mutex);
+
+	return 0;
+}
+
+/**
+ *	scsi_disk_release - Called to free the scsi_disk structure
+ *	@dev: pointer to embedded class device
+ *
+ *	sd_ref_mutex must be held entering this routine.  Because it is
+ *	called on last put, you should always use the scsi_disk_get()
+ *	scsi_disk_put() helpers which manipulate the semaphore directly
+ *	and never do a direct put_device.
+ **/
+static void scsi_disk_release(struct device *dev)
+{
+	struct scsi_disk *sdkp = to_scsi_disk(dev);
+	struct gendisk *disk = sdkp->disk;
+	struct request_queue *q = disk->queue;
+
+	ida_free(&sd_index_ida, sdkp->index);
+
+	/*
+	 * Wait until all requests that are in progress have completed.
+	 * This is necessary to avoid that e.g. scsi_end_request() crashes
+	 * due to clearing the disk->private_data pointer. Wait from inside
+	 * scsi_disk_release() instead of from sd_release() to avoid that
+	 * freezing and unfreezing the request queue affects user space I/O
+	 * in case multiple processes open a /dev/sd... node concurrently.
+	 */
+	blk_mq_freeze_queue(q);
+	blk_mq_unfreeze_queue(q);
+
+	disk->private_data = NULL;
+	put_disk(disk);
+	put_device(&sdkp->device->sdev_gendev);
+
+	sd_zbc_release_disk(sdkp);
+
+	kfree(sdkp);
+}
+
+static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
+{
+	unsigned char cmd[6] = { START_STOP };	/* START_VALID */
+	struct scsi_sense_hdr sshdr;
+	struct scsi_device *sdp = sdkp->device;
+	int res;
+
+	if (start)
+		cmd[4] |= 1;	/* START */
+
+	if (sdp->start_stop_pwr_cond)
+		cmd[4] |= start ? 1 << 4 : 3 << 4;	/* Active or Standby */
+
+	if (!scsi_device_online(sdp))
+		return -ENODEV;
+
+	res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
+			SD_TIMEOUT, sdkp->max_retries, 0, RQF_PM, NULL);
+	if (res) {
+		sd_print_result(sdkp, "Start/Stop Unit failed", res);
+		if (driver_byte(res) == DRIVER_SENSE)
+			sd_print_sense_hdr(sdkp, &sshdr);
+		if (scsi_sense_valid(&sshdr) &&
+			/* 0x3a is medium not present */
+			sshdr.asc == 0x3a)
+			res = 0;
+	}
+
+	/* SCSI error codes must not go to the generic layer */
+	if (res)
+		return -EIO;
+
+	return 0;
+}
+
+/*
+ * Send a SYNCHRONIZE CACHE instruction down to the device through
+ * the normal SCSI command structure.  Wait for the command to
+ * complete.
+ */
+static void sd_shutdown(struct device *dev)
+{
+	struct scsi_disk *sdkp = dev_get_drvdata(dev);
+
+	if (!sdkp)
+		return;         /* this can happen */
+
+	if (pm_runtime_suspended(dev))
+		return;
+
+	if (sdkp->WCE && sdkp->media_present) {
+		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
+		sd_sync_cache(sdkp, NULL);
+	}
+
+	if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
+		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
+		sd_start_stop_device(sdkp, 0);
+	}
+}
+
+static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
+{
+	struct scsi_disk *sdkp = dev_get_drvdata(dev);
+	struct scsi_sense_hdr sshdr;
+	int ret = 0;
+
+	if (!sdkp)	/* E.g.: runtime suspend following sd_remove() */
+		return 0;
+
+	if (sdkp->WCE && sdkp->media_present) {
+		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
+		ret = sd_sync_cache(sdkp, &sshdr);
+
+		if (ret) {
+			/* ignore OFFLINE device */
+			if (ret == -ENODEV)
+				return 0;
+
+			if (!scsi_sense_valid(&sshdr) ||
+			    sshdr.sense_key != ILLEGAL_REQUEST)
+				return ret;
+
+			/*
+			 * sshdr.sense_key == ILLEGAL_REQUEST means this drive
+			 * doesn't support sync. There's not much to do and
+			 * suspend shouldn't fail.
+			 */
+			ret = 0;
+		}
+	}
+
+	if (sdkp->device->manage_start_stop) {
+		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
+		/* an error is not worth aborting a system sleep */
+		ret = sd_start_stop_device(sdkp, 0);
+		if (ignore_stop_errors)
+			ret = 0;
+	}
+
+	return ret;
+}
+
+static int sd_suspend_system(struct device *dev)
+{
+	return sd_suspend_common(dev, true);
+}
+
+static int sd_suspend_runtime(struct device *dev)
+{
+	return sd_suspend_common(dev, false);
+}
+
+static int sd_resume(struct device *dev)
+{
+	struct scsi_disk *sdkp = dev_get_drvdata(dev);
+	int ret;
+
+	if (!sdkp)	/* E.g.: runtime resume at the start of sd_probe() */
+		return 0;
+
+	if (!sdkp->device->manage_start_stop)
+		return 0;
+
+	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
+	ret = sd_start_stop_device(sdkp, 1);
+	if (!ret)
+		opal_unlock_from_suspend(sdkp->opal_dev);
+	return ret;
+}
+
+/**
+ *	init_sd - entry point for this driver (both when built in or when
+ *	a module).
+ *
+ *	Note: this function registers this driver with the scsi mid-level.
+ **/
+static int __init init_sd(void)
+{
+	int majors = 0, i, err;
+
+	SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
+
+	for (i = 0; i < SD_MAJORS; i++) {
+		if (register_blkdev(sd_major(i), "sd") != 0)
+			continue;
+		majors++;
+		blk_register_region(sd_major(i), SD_MINORS, NULL,
+				    sd_default_probe, NULL, NULL);
+	}
+
+	if (!majors)
+		return -ENODEV;
+
+	err = class_register(&sd_disk_class);
+	if (err)
+		goto err_out;
+
+	sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
+					 0, 0, NULL);
+	if (!sd_cdb_cache) {
+		printk(KERN_ERR "sd: can't init extended cdb cache\n");
+		err = -ENOMEM;
+		goto err_out_class;
+	}
+
+	sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
+	if (!sd_cdb_pool) {
+		printk(KERN_ERR "sd: can't init extended cdb pool\n");
+		err = -ENOMEM;
+		goto err_out_cache;
+	}
+
+	sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
+	if (!sd_page_pool) {
+		printk(KERN_ERR "sd: can't init discard page pool\n");
+		err = -ENOMEM;
+		goto err_out_ppool;
+	}
+
+	err = scsi_register_driver(&sd_template.gendrv);
+	if (err)
+		goto err_out_driver;
+
+	return 0;
+
+err_out_driver:
+	mempool_destroy(sd_page_pool);
+
+err_out_ppool:
+	mempool_destroy(sd_cdb_pool);
+
+err_out_cache:
+	kmem_cache_destroy(sd_cdb_cache);
+
+err_out_class:
+	class_unregister(&sd_disk_class);
+err_out:
+	for (i = 0; i < SD_MAJORS; i++)
+		unregister_blkdev(sd_major(i), "sd");
+	return err;
+}
+
+/**
+ *	exit_sd - exit point for this driver (when it is a module).
+ *
+ *	Note: this function unregisters this driver from the scsi mid-level.
+ **/
+static void __exit exit_sd(void)
+{
+	int i;
+
+	SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
+
+	scsi_unregister_driver(&sd_template.gendrv);
+	mempool_destroy(sd_cdb_pool);
+	mempool_destroy(sd_page_pool);
+	kmem_cache_destroy(sd_cdb_cache);
+
+	class_unregister(&sd_disk_class);
+
+	for (i = 0; i < SD_MAJORS; i++) {
+		blk_unregister_region(sd_major(i), SD_MINORS);
+		unregister_blkdev(sd_major(i), "sd");
+	}
+}
+
+module_init(init_sd);
+module_exit(exit_sd);
+
+void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
+{
+	scsi_print_sense_hdr(sdkp->device,
+			     sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
+}
+
+void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
+{
+	const char *hb_string = scsi_hostbyte_string(result);
+	const char *db_string = scsi_driverbyte_string(result);
+
+	if (hb_string || db_string)
+		sd_printk(KERN_INFO, sdkp,
+			  "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
+			  hb_string ? hb_string : "invalid",
+			  db_string ? db_string : "invalid");
+	else
+		sd_printk(KERN_INFO, sdkp,
+			  "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
+			  msg, host_byte(result), driver_byte(result));
+}