text: /*
   *      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/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 int 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 void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
  static void sd_print_result(const struct scsi_disk *, const char *, int);
  
  static DEFINE_SPINLOCK(sd_index_lock);
  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 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,
  			    SD_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;
  
  	if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
  			     SD_MAX_RETRIES, &data, &sshdr)) {
  		if (scsi_sense_valid(&sshdr))
  			sd_print_sense_hdr(sdkp, &sshdr);
  		return -EINVAL;
  	}
  	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;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EACCES;
  
  	sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
  
  	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)
  {
  	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;
  
  	sdp->allow_restart = simple_strtoul(buf, NULL, 10);
  
  	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 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,
  	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,
  		.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_device *sdev = data;
  	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_req(sdev, cdb,
  			send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
  			buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
  	return ret <= 0 ? ret : -EIO;
  }
  #endif /* CONFIG_BLK_SED_OPAL */
  
  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);
  		queue_flag_clear_unlocked(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));
  	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
  }
  
  static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
  {
  	struct scsi_device *sdp = cmd->device;
  	struct request *rq = cmd->request;
  	u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
  	u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
  	unsigned int data_len = 24;
  	char *buf;
  
  	rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
  	if (!rq->special_vec.bv_page)
  		return BLKPREP_DEFER;
  	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(sector, &buf[8]);
  	put_unaligned_be32(nr_sectors, &buf[16]);
  
  	cmd->allowed = SD_MAX_RETRIES;
  	cmd->transfersize = data_len;
  	rq->timeout = SD_TIMEOUT;
  	scsi_req(rq)->resid_len = data_len;
  
  	return scsi_init_io(cmd);
  }
  
  static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap)
  {
  	struct scsi_device *sdp = cmd->device;
  	struct request *rq = cmd->request;
  	u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
  	u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
  	u32 data_len = sdp->sector_size;
  
  	rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
  	if (!rq->special_vec.bv_page)
  		return BLKPREP_DEFER;
  	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(sector, &cmd->cmnd[2]);
  	put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
  
  	cmd->allowed = SD_MAX_RETRIES;
  	cmd->transfersize = data_len;
  	rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
  	scsi_req(rq)->resid_len = data_len;
  
  	return scsi_init_io(cmd);
  }
  
  static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap)
  {
  	struct scsi_device *sdp = cmd->device;
  	struct request *rq = cmd->request;
  	u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
  	u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
  	u32 data_len = sdp->sector_size;
  
  	rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
  	if (!rq->special_vec.bv_page)
  		return BLKPREP_DEFER;
  	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(sector, &cmd->cmnd[2]);
  	put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
  
  	cmd->allowed = SD_MAX_RETRIES;
  	cmd->transfersize = data_len;
  	rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
  	scsi_req(rq)->resid_len = data_len;
  
  	return scsi_init_io(cmd);
  }
  
  static int 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 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
  	u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
  	int ret;
  
  	if (!(rq->cmd_flags & REQ_NOUNMAP)) {
  		switch (sdkp->zeroing_mode) {
  		case SD_ZERO_WS16_UNMAP:
  			ret = sd_setup_write_same16_cmnd(cmd, true);
  			goto out;
  		case SD_ZERO_WS10_UNMAP:
  			ret = sd_setup_write_same10_cmnd(cmd, true);
  			goto out;
  		}
  	}
  
  	if (sdp->no_write_same)
  		return BLKPREP_INVALID;
  
  	if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
  		ret = sd_setup_write_same16_cmnd(cmd, false);
  	else
  		ret = sd_setup_write_same10_cmnd(cmd, false);
  
  out:
  	if (sd_is_zoned(sdkp) && ret == BLKPREP_OK)
  		return sd_zbc_write_lock_zone(cmd);
  
  	return ret;
  }
  
  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;
  
  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 int 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;
  	sector_t sector = blk_rq_pos(rq);
  	unsigned int nr_sectors = blk_rq_sectors(rq);
  	unsigned int nr_bytes = blk_rq_bytes(rq);
  	int ret;
  
  	if (sdkp->device->no_write_same)
  		return BLKPREP_INVALID;
  
  	BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
  
  	if (sd_is_zoned(sdkp)) {
  		ret = sd_zbc_write_lock_zone(cmd);
  		if (ret != BLKPREP_OK)
  			return ret;
  	}
  
  	sector >>= ilog2(sdp->sector_size) - 9;
  	nr_sectors >>= ilog2(sdp->sector_size) - 9;
  
  	rq->timeout = SD_WRITE_SAME_TIMEOUT;
  
  	if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
  		cmd->cmd_len = 16;
  		cmd->cmnd[0] = WRITE_SAME_16;
  		put_unaligned_be64(sector, &cmd->cmnd[2]);
  		put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
  	} else {
  		cmd->cmd_len = 10;
  		cmd->cmnd[0] = WRITE_SAME;
  		put_unaligned_be32(sector, &cmd->cmnd[2]);
  		put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
  	}
  
  	cmd->transfersize = sdp->sector_size;
  	cmd->allowed = SD_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_init_io(cmd);
  	rq->__data_len = nr_bytes;
  
  	if (sd_is_zoned(sdkp) && ret != BLKPREP_OK)
  		sd_zbc_write_unlock_zone(cmd);
  
  	return ret;
  }
  
  static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
  {
  	struct request *rq = cmd->request;
  
  	/* 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 = SD_MAX_RETRIES;
  
  	rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
  	return BLKPREP_OK;
  }
  
  static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
  {
  	struct request *rq = SCpnt->request;
  	struct scsi_device *sdp = SCpnt->device;
  	struct gendisk *disk = rq->rq_disk;
  	struct scsi_disk *sdkp = scsi_disk(disk);
  	sector_t block = blk_rq_pos(rq);
  	sector_t threshold;
  	unsigned int this_count = blk_rq_sectors(rq);
  	unsigned int dif, dix;
  	bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
  	int ret;
  	unsigned char protect;
  
  	if (zoned_write) {
  		ret = sd_zbc_write_lock_zone(SCpnt);
  		if (ret != BLKPREP_OK)
  			return ret;
  	}
  
  	ret = scsi_init_io(SCpnt);
  	if (ret != BLKPREP_OK)
  		goto out;
  	WARN_ON_ONCE(SCpnt != rq->special);
  
  	/* from here on until we're complete, any goto out
  	 * is used for a killable error condition */
  	ret = BLKPREP_KILL;
  
  	SCSI_LOG_HLQUEUE(1,
  		scmd_printk(KERN_INFO, SCpnt,
  			"%s: block=%llu, count=%d\n",
  			__func__, (unsigned long long)block, this_count));
  
  	if (!sdp || !scsi_device_online(sdp) ||
  	    block + blk_rq_sectors(rq) > get_capacity(disk)) {
  		SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
  						"Finishing %u sectors\n",
  						blk_rq_sectors(rq)));
  		SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
  						"Retry with 0x%p\n", SCpnt));
  		goto out;
  	}
  
  	if (sdp->changed) {
  		/*
  		 * quietly refuse to do anything to a changed disc until 
  		 * the changed bit has been reset
  		 */
  		/* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
  		goto out;
  	}
  
  	/*
  	 * Some SD card readers can't handle multi-sector accesses which touch
  	 * the last one or two hardware sectors.  Split accesses as needed.
  	 */
  	threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
  		(sdp->sector_size / 512);
  
  	if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
  		if (block < threshold) {
  			/* Access up to the threshold but not beyond */
  			this_count = threshold - block;
  		} else {
  			/* Access only a single hardware sector */
  			this_count = sdp->sector_size / 512;
  		}
  	}
  
  	SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
  					(unsigned long long)block));
  
  	/*
  	 * If we have a 1K hardware sectorsize, prevent access to single
  	 * 512 byte sectors.  In theory we could handle this - in fact
  	 * the scsi cdrom driver must be able to handle this because
  	 * we typically use 1K blocksizes, and cdroms typically have
  	 * 2K hardware sectorsizes.  Of course, things are simpler
  	 * with the cdrom, since it is read-only.  For performance
  	 * reasons, the filesystems should be able to handle this
  	 * and not force the scsi disk driver to use bounce buffers
  	 * for this.
  	 */
  	if (sdp->sector_size == 1024) {
  		if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
  			scmd_printk(KERN_ERR, SCpnt,
  				    "Bad block number requested\n");
  			goto out;
  		} else {
  			block = block >> 1;
  			this_count = this_count >> 1;
  		}
  	}
  	if (sdp->sector_size == 2048) {
  		if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
  			scmd_printk(KERN_ERR, SCpnt,
  				    "Bad block number requested\n");
  			goto out;
  		} else {
  			block = block >> 2;
  			this_count = this_count >> 2;
  		}
  	}
  	if (sdp->sector_size == 4096) {
  		if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
  			scmd_printk(KERN_ERR, SCpnt,
  				    "Bad block number requested\n");
  			goto out;
  		} else {
  			block = block >> 3;
  			this_count = this_count >> 3;
  		}
  	}
  	if (rq_data_dir(rq) == WRITE) {
  		SCpnt->cmnd[0] = WRITE_6;
  
  		if (blk_integrity_rq(rq))
  			sd_dif_prepare(SCpnt);
  
  	} else if (rq_data_dir(rq) == READ) {
  		SCpnt->cmnd[0] = READ_6;
  	} else {
  		scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
  		goto out;
  	}
  
  	SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
  					"%s %d/%u 512 byte blocks.\n",
  					(rq_data_dir(rq) == WRITE) ?
  					"writing" : "reading", this_count,
  					blk_rq_sectors(rq)));
  
  	dix = scsi_prot_sg_count(SCpnt);
  	dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
  
  	if (dif || dix)
  		protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
  	else
  		protect = 0;
  
  	if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
  		SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
  
  		if (unlikely(SCpnt->cmnd == NULL)) {
  			ret = BLKPREP_DEFER;
  			goto out;
  		}
  
  		SCpnt->cmd_len = SD_EXT_CDB_SIZE;
  		memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
  		SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
  		SCpnt->cmnd[7] = 0x18;
  		SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
  		SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
  
  		/* LBA */
  		SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
  		SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
  		SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
  		SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
  		SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
  		SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
  		SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
  		SCpnt->cmnd[19] = (unsigned char) block & 0xff;
  
  		/* Expected Indirect LBA */
  		SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
  		SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
  		SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
  		SCpnt->cmnd[23] = (unsigned char) block & 0xff;
  
  		/* Transfer length */
  		SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
  		SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
  		SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
  		SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
  	} else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
  		SCpnt->cmnd[0] += READ_16 - READ_6;
  		SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
  		SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
  		SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
  		SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
  		SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
  		SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
  		SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
  		SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
  		SCpnt->cmnd[9] = (unsigned char) block & 0xff;
  		SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
  		SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
  		SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
  		SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
  		SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
  	} else if ((this_count > 0xff) || (block > 0x1fffff) ||
  		   scsi_device_protection(SCpnt->device) ||
  		   SCpnt->device->use_10_for_rw) {
  		SCpnt->cmnd[0] += READ_10 - READ_6;
  		SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
  		SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
  		SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
  		SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
  		SCpnt->cmnd[5] = (unsigned char) block & 0xff;
  		SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
  		SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
  		SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
  	} else {
  		if (unlikely(rq->cmd_flags & REQ_FUA)) {
  			/*
  			 * 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, SCpnt,
  				    "FUA write on READ/WRITE(6) drive\n");
  			goto out;
  		}
  
  		SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
  		SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
  		SCpnt->cmnd[3] = (unsigned char) block & 0xff;
  		SCpnt->cmnd[4] = (unsigned char) this_count;
  		SCpnt->cmnd[5] = 0;
  	}
  	SCpnt->sdb.length = this_count * sdp->sector_size;
  
  	/*
  	 * 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.
  	 */
  	SCpnt->transfersize = sdp->sector_size;
  	SCpnt->underflow = this_count << 9;
  	SCpnt->allowed = SD_MAX_RETRIES;
  
  	/*
  	 * This indicates that the command is ready from our end to be
  	 * queued.
  	 */
  	ret = BLKPREP_OK;
   out:
  	if (zoned_write && ret != BLKPREP_OK)
  		sd_zbc_write_unlock_zone(SCpnt);
  
  	return ret;
  }
  
  static int 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 BLKPREP_INVALID;
  		}
  	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:
  		return sd_setup_read_write_cmnd(cmd);
  	case REQ_OP_ZONE_REPORT:
  		return sd_zbc_setup_report_cmnd(cmd);
  	case REQ_OP_ZONE_RESET:
  		return sd_zbc_setup_reset_cmnd(cmd);
  	default:
  		BUG();
  	}
  }
  
  static void sd_uninit_command(struct scsi_cmnd *SCpnt)
  {
  	struct request *rq = SCpnt->request;
  
  	if (SCpnt->flags & SCMD_ZONE_WRITE_LOCK)
  		sd_zbc_write_unlock_zone(SCpnt);
  
  	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
  		__free_page(rq->special_vec.bv_page);
  
  	if (SCpnt->cmnd != scsi_req(rq)->cmd) {
  		mempool_free(SCpnt->cmnd, sd_cdb_pool);
  		SCpnt->cmnd = NULL;
  		SCpnt->cmd_len = 0;
  	}
  }
  
  /**
   *	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 (sdev->removable || sdkp->write_prot)
  		check_disk_change(bdev);
  
  	/*
  	 * 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);
  	}
  
  	/*
  	 * XXX and what if there are packets in flight and this close()
  	 * XXX is followed by a "rmmod sd_mod"?
  	 */
  
  	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
   *	@arg: 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(struct block_device *bdev, fmode_t mode,
  		    unsigned int cmd, unsigned long arg)
  {
  	struct gendisk *disk = bdev->bd_disk;
  	struct scsi_disk *sdkp = scsi_disk(disk);
  	struct scsi_device *sdp = sdkp->device;
  	void __user *p = (void __user *)arg;
  	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);
  			if (error != -ENOTTY)
  				break;
  			error = scsi_ioctl(sdp, 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, SD_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, SD_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 */
  				/* 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);
  
  	revalidate_disk(sdkp->disk);
  }
  
  
  #ifdef CONFIG_COMPAT
  /* 
   * This gets directly called from VFS. When the ioctl 
   * is not recognized we go back to the other translation paths. 
   */
  static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
  			   unsigned int cmd, unsigned long arg)
  {
  	struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
  	int error;
  
  	error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
  			(mode & FMODE_NDELAY) != 0);
  	if (error)
  		return error;
  	       
  	/* 
  	 * Let the static ioctl translation table take care of it.
  	 */
  	if (!sdev->host->hostt->compat_ioctl)
  		return -ENOIOCTLCMD; 
  	return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
  }
  #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_device *sdev = scsi_disk(bdev->bd_disk)->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, SD_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,
  	.revalidate_disk	= sd_revalidate_disk,
  	.unlock_native_capacity	= sd_unlock_native_capacity,
  	.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:
  		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;
  	case REQ_OP_ZONE_REPORT:
  		if (!result) {
  			good_bytes = scsi_bufflen(SCpnt)
  				- scsi_get_resid(SCpnt);
  			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);
  			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->__data_len = blk_rq_bytes(req);
  					req->rq_flags |= RQF_QUIET;
  				}
  				break;
  			}
  		}
  		break;
  	default:
  		break;
  	}
  
   out:
  	if (sd_is_zoned(sdkp))
  		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)));
  
  	if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
  		sd_dif_complete(SCpnt, good_bytes);
  
  	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,
  						      SD_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) == 0) {
  			/* 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 */
  			/*
  			 * 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, SD_MAX_RETRIES,
  						 NULL);
  				spintime_expire = jiffies + 100 * HZ;
  				spintime = 1;
  			}
  			/* Wait 1 second for next try */
  			msleep(1000);
  			printk(".");
  
  		/*
  		 * 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("ready\n");
  		else
  			printk("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)
  		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
  
  /*
   * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
   * and the reported logical block size is bigger than 512 bytes. Note
   * that last_sector is a u64 and therefore logical_to_sectors() is not
   * applicable.
   */
  static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
  {
  	u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
  
  	if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
  		return false;
  
  	return true;
  }
  
  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, SD_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;
  	}
  
  	if (!sd_addressable_capacity(lba, sector_size)) {
  		sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
  			"kernel compiled with support for large block "
  			"devices.\n");
  		sdkp->capacity = 0;
  		return -EOVERFLOW;
  	}
  
  	/* 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, SD_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;
  	}
  
  	if (!sd_addressable_capacity(lba, sector_size)) {
  		sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
  			"kernel compiled with support for large block "
  			"devices.\n");
  		sdkp->capacity = 0;
  		return -EOVERFLOW;
  	}
  
  	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;
  			}
  		}
  	}
  
  	/* 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];
  
  	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));
  
  	if (sdkp->first_scan || old_capacity != sdkp->capacity) {
  		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);
  
  		sd_zbc_print_zones(sdkp);
  	}
  }
  
  /* called with buffer of length 512 */
  static inline int
  sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
  		 unsigned char *buffer, int len, struct scsi_mode_data *data,
  		 struct scsi_sense_hdr *sshdr)
  {
  	return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
  			       SD_TIMEOUT, SD_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(sdp, 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(sdp, 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 (!scsi_status_is_good(res))
  			res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
  
  		/*
  		 * Third attempt: ask 255 bytes, as we did earlier.
  		 */
  		if (!scsi_status_is_good(res))
  			res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
  					       &data, NULL);
  	}
  
  	if (!scsi_status_is_good(res)) {
  		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(sdp, dbd, modepage, buffer, first_len,
  			&data, &sshdr);
  
  	if (!scsi_status_is_good(res))
  		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(sdp, dbd, modepage, buffer, len,
  				&data, &sshdr);
  
  	if (scsi_status_is_good(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,
  			      SD_MAX_RETRIES, &data, &sshdr);
  
  	if (!scsi_status_is_good(res) || !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) {
  		queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
  		queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
  	}
  
  	if (sdkp->device->type == TYPE_ZBC) {
  		/* Host-managed */
  		q->limits.zoned = BLK_ZONED_HM;
  	} else {
  		sdkp->zoned = (buffer[8] >> 4) & 3;
  		if (sdkp->zoned == 1)
  			/* Host-aware */
  			q->limits.zoned = BLK_ZONED_HA;
  		else
  			/*
  			 * Treat drive-managed devices as
  			 * regular block devices.
  			 */
  			q->limits.zoned = BLK_ZONED_NONE;
  	}
  	if (blk_queue_is_zoned(q) && sdkp->first_scan)
  		sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
  		      q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
  
   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;
  }
  
  /**
   *	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);
  
  		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);
  
  	/*
  	 * Determine the device's preferred I/O size for reads and writes
  	 * unless the reported value is unreasonably small, large, or
  	 * garbage.
  	 */
  	if (sdkp->opt_xfer_blocks &&
  	    sdkp->opt_xfer_blocks <= dev_max &&
  	    sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
  	    logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
  		q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
  		rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
  	} else
  		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(disk, logical_to_sectors(sdp, sdkp->capacity));
  	sd_config_write_same(sdkp);
  	kfree(buffer);
  
   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;
  }
  
  /*
   * The asynchronous part of sd_probe
   */
  static void sd_probe_async(void *data, async_cookie_t cookie)
  {
  	struct scsi_disk *sdkp = data;
  	struct scsi_device *sdp;
  	struct gendisk *gd;
  	u32 index;
  	struct device *dev;
  
  	sdp = sdkp->device;
  	gd = sdkp->disk;
  	index = sdkp->index;
  	dev = &sdp->sdev_gendev;
  
  	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;
  	}
  
  	blk_pm_runtime_init(sdp->request_queue, dev);
  	device_add_disk(dev, gd);
  	if (sdkp->capacity)
  		sd_dif_config_host(sdkp);
  
  	sd_revalidate_disk(gd);
  
  	if (sdkp->security) {
  		sdkp->opal_dev = init_opal_dev(sdp, &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);
  	put_device(&sdkp->dev);
  }
  
  /**
   *	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;
  
  	do {
  		if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
  			goto out_put;
  
  		spin_lock(&sd_index_lock);
  		error = ida_get_new(&sd_index_ida, &index);
  		spin_unlock(&sd_index_lock);
  	} while (error == -EAGAIN);
  
  	if (error) {
  		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;
  	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 = dev;
  	sdkp->dev.class = &sd_disk_class;
  	dev_set_name(&sdkp->dev, "%s", dev_name(dev));
  
  	error = device_add(&sdkp->dev);
  	if (error)
  		goto out_free_index;
  
  	get_device(dev);
  	dev_set_drvdata(dev, sdkp);
  
  	get_device(&sdkp->dev);	/* prevent release before async_schedule */
  	async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
  
  	return 0;
  
   out_free_index:
  	spin_lock(&sd_index_lock);
  	ida_remove(&sd_index_ida, index);
  	spin_unlock(&sd_index_lock);
   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);
  	async_synchronize_full_domain(&scsi_sd_probe_domain);
  	device_del(&sdkp->dev);
  	del_gendisk(sdkp->disk);
  	sd_shutdown(dev);
  
  	sd_zbc_remove(sdkp);
  
  	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;
  	
  	spin_lock(&sd_index_lock);
  	ida_remove(&sd_index_ida, sdkp->index);
  	spin_unlock(&sd_index_lock);
  
  	disk->private_data = NULL;
  	put_disk(disk);
  	put_device(&sdkp->device->sdev_gendev);
  
  	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, SD_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;
  	}
  
  	err = scsi_register_driver(&sd_template.gendrv);
  	if (err)
  		goto err_out_driver;
  
  	return 0;
  
  err_out_driver:
  	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);
  	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);
  
  static 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);
  }
  
  static 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));
  }
  
  