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 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *      sd.c Copyright (C) 1992 Drew Eckhardt
  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
  *
  *      Linux scsi disk driver
  *              Initial versions: Drew Eckhardt
  *              Subsequent revisions: Eric Youngdale
  *  Modification history:
  *       - Drew Eckhardt <drew@colorado.edu> original
  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
  *         outstanding request, and other enhancements.
  *         Support loadable low-level scsi drivers.
  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
  *         eight major numbers.
  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  *   - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
  *     sd_init and cleanups.
  *   - Alex Davis <letmein@erols.com> Fix problem where partition info
  *     not being read in sd_open. Fix problem where removable media 
  *     could be ejected after sd_open.
  *   - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  *   - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
  *     <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
  *     Support 32k/1M disks.
  *
  *  Logging policy (needs CONFIG_SCSI_LOGGING defined):
  *   - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  *   - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  *   - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  *   - entering other commands: SCSI_LOG_HLQUEUE level 3
  *  Note: when the logging level is set by the user, it must be greater
  *  than the level indicated above to trigger output.   
  */
 
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/bio.h>
 #include <linux/hdreg.h>
 #include <linux/errno.h>
 #include <linux/idr.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/blk-pm.h>
 #include <linux/delay.h>
 #include <linux/major.h>
 #include <linux/mutex.h>
 #include <linux/string_helpers.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);
 
 #define SD_MINORS   16
 
 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_system(struct device *);
 static int sd_resume_runtime(struct device *);
 static void sd_rescan(struct device *);
 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 static int sd_done(struct scsi_cmnd *);
 static void sd_eh_reset(struct scsi_cmnd *);
 static int sd_eh_action(struct scsi_cmnd *, int);
 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 static void scsi_disk_release(struct device *cdev);
 
 static DEFINE_IDA(sd_index_ida);
 
 static struct kmem_cache *sd_cdb_cache;
 static mempool_t *sd_page_pool;
 static struct lock_class_key sd_bio_compl_lkclass;
 
 static const char *sd_cache_types[] = {
     "write through", "none", "write back",
     "write back, no read (daft)"
 };
 
 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 {
     bool wc = false, fua = false;
 
     if (sdkp->WCE) {
         wc = true;
         if (sdkp->DPOFUA)
             fua = true;
     }
 
     blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 }
 
 static ssize_t
 cache_type_store(struct device *dev, struct device_attribute *attr,
          const char *buf, size_t count)
 {
     int ct, rcd, wce, sp;
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     struct scsi_device *sdp = sdkp->device;
     char buffer[64];
     char *buffer_data;
     struct scsi_mode_data data;
     struct scsi_sense_hdr sshdr;
     static const char temp[] = "temporary ";
     int len;
 
     if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
         /* no cache control on RBC devices; theoretically they
          * can do it, but there's probably so many exceptions
          * it's not worth the risk */
         return -EINVAL;
 
     if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
         buf += sizeof(temp) - 1;
         sdkp->cache_override = 1;
     } else {
         sdkp->cache_override = 0;
     }
 
     ct = sysfs_match_string(sd_cache_types, buf);
     if (ct < 0)
         return -EINVAL;
 
     rcd = ct & 0x01 ? 1 : 0;
     wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 
     if (sdkp->cache_override) {
         sdkp->WCE = wce;
         sdkp->RCD = rcd;
         sd_set_flush_flag(sdkp);
         return count;
     }
 
     if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
                 sdkp->max_retries, &data, NULL))
         return -EINVAL;
     len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
           data.block_descriptor_length);
     buffer_data = buffer + data.header_length +
         data.block_descriptor_length;
     buffer_data[2] &= ~0x05;
     buffer_data[2] |= wce << 2 | rcd;
     sp = buffer_data[0] & 0x80 ? 1 : 0;
     buffer_data[0] &= ~0x80;
 
     /*
      * Ensure WP, DPOFUA, and RESERVED fields are cleared in
      * received mode parameter buffer before doing MODE SELECT.
      */
     data.device_specific = 0;
 
     if (scsi_mode_select(sdp, 1, sp, buffer_data, len, SD_TIMEOUT,
                  sdkp->max_retries, &data, &sshdr)) {
         if (scsi_sense_valid(&sshdr))
             sd_print_sense_hdr(sdkp, &sshdr);
         return -EINVAL;
     }
     sd_revalidate_disk(sdkp->disk);
     return count;
 }
 
 static ssize_t
 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
                char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     struct scsi_device *sdp = sdkp->device;
 
     return sprintf(buf, "%u\n", sdp->manage_start_stop);
 }
 
 static ssize_t
 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
             const char *buf, size_t count)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     struct scsi_device *sdp = sdkp->device;
     bool v;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EACCES;
 
     if (kstrtobool(buf, &v))
         return -EINVAL;
 
     sdp->manage_start_stop = v;
 
     return count;
 }
 static DEVICE_ATTR_RW(manage_start_stop);
 
 static ssize_t
 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 }
 
 static ssize_t
 allow_restart_store(struct device *dev, struct device_attribute *attr,
             const char *buf, size_t count)
 {
     bool v;
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     struct scsi_device *sdp = sdkp->device;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EACCES;
 
     if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
         return -EINVAL;
 
     if (kstrtobool(buf, &v))
         return -EINVAL;
 
     sdp->allow_restart = v;
 
     return count;
 }
 static DEVICE_ATTR_RW(allow_restart);
 
 static ssize_t
 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     int ct = sdkp->RCD + 2*sdkp->WCE;
 
     return sprintf(buf, "%s\n", sd_cache_types[ct]);
 }
 static DEVICE_ATTR_RW(cache_type);
 
 static ssize_t
 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%u\n", sdkp->DPOFUA);
 }
 static DEVICE_ATTR_RO(FUA);
 
 static ssize_t
 protection_type_show(struct device *dev, struct device_attribute *attr,
              char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%u\n", sdkp->protection_type);
 }
 
 static ssize_t
 protection_type_store(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     unsigned int val;
     int err;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EACCES;
 
     err = kstrtouint(buf, 10, &val);
 
     if (err)
         return err;
 
     if (val <= T10_PI_TYPE3_PROTECTION)
         sdkp->protection_type = val;
 
     return count;
 }
 static DEVICE_ATTR_RW(protection_type);
 
 static ssize_t
 protection_mode_show(struct device *dev, struct device_attribute *attr,
              char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     struct scsi_device *sdp = sdkp->device;
     unsigned int dif, dix;
 
     dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
     dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 
     if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
         dif = 0;
         dix = 1;
     }
 
     if (!dif && !dix)
         return sprintf(buf, "none\n");
 
     return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 }
 static DEVICE_ATTR_RO(protection_mode);
 
 static ssize_t
 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%u\n", sdkp->ATO);
 }
 static DEVICE_ATTR_RO(app_tag_own);
 
 static ssize_t
 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
                char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%u\n", sdkp->lbpme);
 }
 static DEVICE_ATTR_RO(thin_provisioning);
 
 /* sysfs_match_string() requires dense arrays */
 static const char *lbp_mode[] = {
     [SD_LBP_FULL]       = "full",
     [SD_LBP_UNMAP]      = "unmap",
     [SD_LBP_WS16]       = "writesame_16",
     [SD_LBP_WS10]       = "writesame_10",
     [SD_LBP_ZERO]       = "writesame_zero",
     [SD_LBP_DISABLE]    = "disabled",
 };
 
 static ssize_t
 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
                char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 }
 
 static ssize_t
 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
             const char *buf, size_t count)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     struct scsi_device *sdp = sdkp->device;
     int mode;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EACCES;
 
     if (sd_is_zoned(sdkp)) {
         sd_config_discard(sdkp, SD_LBP_DISABLE);
         return count;
     }
 
     if (sdp->type != TYPE_DISK)
         return -EINVAL;
 
     mode = sysfs_match_string(lbp_mode, buf);
     if (mode < 0)
         return -EINVAL;
 
     sd_config_discard(sdkp, mode);
 
     return count;
 }
 static DEVICE_ATTR_RW(provisioning_mode);
 
 /* sysfs_match_string() requires dense arrays */
 static const char *zeroing_mode[] = {
     [SD_ZERO_WRITE]     = "write",
     [SD_ZERO_WS]        = "writesame",
     [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
     [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 };
 
 static ssize_t
 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
           char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 }
 
 static ssize_t
 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
            const char *buf, size_t count)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     int mode;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EACCES;
 
     mode = sysfs_match_string(zeroing_mode, buf);
     if (mode < 0)
         return -EINVAL;
 
     sdkp->zeroing_mode = mode;
 
     return count;
 }
 static DEVICE_ATTR_RW(zeroing_mode);
 
 static ssize_t
 max_medium_access_timeouts_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 }
 
 static ssize_t
 max_medium_access_timeouts_store(struct device *dev,
                  struct device_attribute *attr, const char *buf,
                  size_t count)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     int err;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EACCES;
 
     err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 
     return err ? err : count;
 }
 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 
 static ssize_t
 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
                char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 }
 
 static ssize_t
 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
                 const char *buf, size_t count)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     struct scsi_device *sdp = sdkp->device;
     unsigned long max;
     int err;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EACCES;
 
     if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
         return -EINVAL;
 
     err = kstrtoul(buf, 10, &max);
 
     if (err)
         return err;
 
     if (max == 0)
         sdp->no_write_same = 1;
     else if (max <= SD_MAX_WS16_BLOCKS) {
         sdp->no_write_same = 0;
         sdkp->max_ws_blocks = max;
     }
 
     sd_config_write_same(sdkp);
 
     return count;
 }
 static DEVICE_ATTR_RW(max_write_same_blocks);
 
 static ssize_t
 zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     if (sdkp->device->type == TYPE_ZBC)
         return sprintf(buf, "host-managed\n");
     if (sdkp->zoned == 1)
         return sprintf(buf, "host-aware\n");
     if (sdkp->zoned == 2)
         return sprintf(buf, "drive-managed\n");
     return sprintf(buf, "none\n");
 }
 static DEVICE_ATTR_RO(zoned_cap);
 
 static ssize_t
 max_retries_store(struct device *dev, struct device_attribute *attr,
           const char *buf, size_t count)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
     struct scsi_device *sdev = sdkp->device;
     int retries, err;
 
     err = kstrtoint(buf, 10, &retries);
     if (err)
         return err;
 
     if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) {
         sdkp->max_retries = retries;
         return count;
     }
 
     sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n",
             SD_MAX_RETRIES);
     return -EINVAL;
 }
 
 static ssize_t
 max_retries_show(struct device *dev, struct device_attribute *attr,
          char *buf)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     return sprintf(buf, "%d\n", sdkp->max_retries);
 }
 
 static DEVICE_ATTR_RW(max_retries);
 
 static struct attribute *sd_disk_attrs[] = {
     &dev_attr_cache_type.attr,
     &dev_attr_FUA.attr,
     &dev_attr_allow_restart.attr,
     &dev_attr_manage_start_stop.attr,
     &dev_attr_protection_type.attr,
     &dev_attr_protection_mode.attr,
     &dev_attr_app_tag_own.attr,
     &dev_attr_thin_provisioning.attr,
     &dev_attr_provisioning_mode.attr,
     &dev_attr_zeroing_mode.attr,
     &dev_attr_max_write_same_blocks.attr,
     &dev_attr_max_medium_access_timeouts.attr,
     &dev_attr_zoned_cap.attr,
     &dev_attr_max_retries.attr,
     NULL,
 };
 ATTRIBUTE_GROUPS(sd_disk);
 
 static struct class sd_disk_class = {
     .name       = "scsi_disk",
     .owner      = THIS_MODULE,
     .dev_release    = scsi_disk_release,
     .dev_groups = sd_disk_groups,
 };
 
 static const struct dev_pm_ops sd_pm_ops = {
     .suspend        = sd_suspend_system,
     .resume         = sd_resume_system,
     .poweroff       = sd_suspend_system,
     .restore        = sd_resume_system,
     .runtime_suspend    = sd_suspend_runtime,
     .runtime_resume     = sd_resume_runtime,
 };
 
 static struct scsi_driver sd_template = {
     .gendrv = {
         .name       = "sd",
         .owner      = THIS_MODULE,
         .probe      = sd_probe,
         .probe_type = PROBE_PREFER_ASYNCHRONOUS,
         .remove     = sd_remove,
         .shutdown   = sd_shutdown,
         .pm     = &sd_pm_ops,
     },
     .rescan         = sd_rescan,
     .init_command       = sd_init_command,
     .uninit_command     = sd_uninit_command,
     .done           = sd_done,
     .eh_action      = sd_eh_action,
     .eh_reset       = sd_eh_reset,
 };
 
 /*
  * Don't request a new module, as that could deadlock in multipath
  * environment.
  */
 static void sd_default_probe(dev_t devt)
 {
 }
 
 /*
  * 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 */
     }
 }
 
 #ifdef CONFIG_BLK_SED_OPAL
 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
         size_t len, bool send)
 {
     struct scsi_disk *sdkp = data;
     struct scsi_device *sdev = sdkp->device;
     u8 cdb[12] = { 0, };
     int ret;
 
     cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
     cdb[1] = secp;
     put_unaligned_be16(spsp, &cdb[2]);
     put_unaligned_be32(len, &cdb[6]);
 
     ret = scsi_execute(sdev, cdb, send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
         buffer, len, NULL, NULL, SD_TIMEOUT, sdkp->max_retries, 0,
         RQF_PM, NULL);
     return ret <= 0 ? ret : -EIO;
 }
 #endif /* CONFIG_BLK_SED_OPAL */
 
 /*
  * Look up the DIX operation based on whether the command is read or
  * write and whether dix and dif are enabled.
  */
 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
 {
     /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
     static const unsigned int ops[] = { /* wrt dix dif */
         SCSI_PROT_NORMAL,       /*  0   0   0  */
         SCSI_PROT_READ_STRIP,       /*  0   0   1  */
         SCSI_PROT_READ_INSERT,      /*  0   1   0  */
         SCSI_PROT_READ_PASS,        /*  0   1   1  */
         SCSI_PROT_NORMAL,       /*  1   0   0  */
         SCSI_PROT_WRITE_INSERT,     /*  1   0   1  */
         SCSI_PROT_WRITE_STRIP,      /*  1   1   0  */
         SCSI_PROT_WRITE_PASS,       /*  1   1   1  */
     };
 
     return ops[write << 2 | dix << 1 | dif];
 }
 
 /*
  * Returns a mask of the protection flags that are valid for a given DIX
  * operation.
  */
 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
 {
     static const unsigned int flag_mask[] = {
         [SCSI_PROT_NORMAL]      = 0,
 
         [SCSI_PROT_READ_STRIP]      = SCSI_PROT_TRANSFER_PI |
                           SCSI_PROT_GUARD_CHECK |
                           SCSI_PROT_REF_CHECK |
                           SCSI_PROT_REF_INCREMENT,
 
         [SCSI_PROT_READ_INSERT]     = SCSI_PROT_REF_INCREMENT |
                           SCSI_PROT_IP_CHECKSUM,
 
         [SCSI_PROT_READ_PASS]       = SCSI_PROT_TRANSFER_PI |
                           SCSI_PROT_GUARD_CHECK |
                           SCSI_PROT_REF_CHECK |
                           SCSI_PROT_REF_INCREMENT |
                           SCSI_PROT_IP_CHECKSUM,
 
         [SCSI_PROT_WRITE_INSERT]    = SCSI_PROT_TRANSFER_PI |
                           SCSI_PROT_REF_INCREMENT,
 
         [SCSI_PROT_WRITE_STRIP]     = SCSI_PROT_GUARD_CHECK |
                           SCSI_PROT_REF_CHECK |
                           SCSI_PROT_REF_INCREMENT |
                           SCSI_PROT_IP_CHECKSUM,
 
         [SCSI_PROT_WRITE_PASS]      = SCSI_PROT_TRANSFER_PI |
                           SCSI_PROT_GUARD_CHECK |
                           SCSI_PROT_REF_CHECK |
                           SCSI_PROT_REF_INCREMENT |
                           SCSI_PROT_IP_CHECKSUM,
     };
 
     return flag_mask[prot_op];
 }
 
 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
                        unsigned int dix, unsigned int dif)
 {
     struct request *rq = scsi_cmd_to_rq(scmd);
     struct bio *bio = rq->bio;
     unsigned int prot_op = sd_prot_op(rq_data_dir(rq), 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);
         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));
 }
 
 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 {
     struct scsi_device *sdp = cmd->device;
     struct request *rq = scsi_cmd_to_rq(cmd);
     struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
     u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
     u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
     unsigned int data_len = 24;
     char *buf;
 
     rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
     if (!rq->special_vec.bv_page)
         return BLK_STS_RESOURCE;
     clear_highpage(rq->special_vec.bv_page);
     rq->special_vec.bv_offset = 0;
     rq->special_vec.bv_len = data_len;
     rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 
     cmd->cmd_len = 10;
     cmd->cmnd[0] = UNMAP;
     cmd->cmnd[8] = 24;
 
     buf = bvec_virt(&rq->special_vec);
     put_unaligned_be16(6 + 16, &buf[0]);
     put_unaligned_be16(16, &buf[2]);
     put_unaligned_be64(lba, &buf[8]);
     put_unaligned_be32(nr_blocks, &buf[16]);
 
     cmd->allowed = sdkp->max_retries;
     cmd->transfersize = data_len;
     rq->timeout = SD_TIMEOUT;
 
     return scsi_alloc_sgtables(cmd);
 }
 
 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
         bool unmap)
 {
     struct scsi_device *sdp = cmd->device;
     struct request *rq = scsi_cmd_to_rq(cmd);
     struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
     u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
     u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
     u32 data_len = sdp->sector_size;
 
     rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
     if (!rq->special_vec.bv_page)
         return BLK_STS_RESOURCE;
     clear_highpage(rq->special_vec.bv_page);
     rq->special_vec.bv_offset = 0;
     rq->special_vec.bv_len = data_len;
     rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 
     cmd->cmd_len = 16;
     cmd->cmnd[0] = WRITE_SAME_16;
     if (unmap)
         cmd->cmnd[1] = 0x8; /* UNMAP */
     put_unaligned_be64(lba, &cmd->cmnd[2]);
     put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 
     cmd->allowed = sdkp->max_retries;
     cmd->transfersize = data_len;
     rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 
     return scsi_alloc_sgtables(cmd);
 }
 
 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
         bool unmap)
 {
     struct scsi_device *sdp = cmd->device;
     struct request *rq = scsi_cmd_to_rq(cmd);
     struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
     u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
     u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
     u32 data_len = sdp->sector_size;
 
     rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
     if (!rq->special_vec.bv_page)
         return BLK_STS_RESOURCE;
     clear_highpage(rq->special_vec.bv_page);
     rq->special_vec.bv_offset = 0;
     rq->special_vec.bv_len = data_len;
     rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 
     cmd->cmd_len = 10;
     cmd->cmnd[0] = WRITE_SAME;
     if (unmap)
         cmd->cmnd[1] = 0x8; /* UNMAP */
     put_unaligned_be32(lba, &cmd->cmnd[2]);
     put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 
     cmd->allowed = sdkp->max_retries;
     cmd->transfersize = data_len;
     rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 
     return scsi_alloc_sgtables(cmd);
 }
 
 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 {
     struct request *rq = scsi_cmd_to_rq(cmd);
     struct scsi_device *sdp = cmd->device;
     struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
     u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
     u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 
     if (!(rq->cmd_flags & REQ_NOUNMAP)) {
         switch (sdkp->zeroing_mode) {
         case SD_ZERO_WS16_UNMAP:
             return sd_setup_write_same16_cmnd(cmd, true);
         case SD_ZERO_WS10_UNMAP:
             return sd_setup_write_same10_cmnd(cmd, true);
         }
     }
 
     if (sdp->no_write_same) {
         rq->rq_flags |= RQF_QUIET;
         return BLK_STS_TARGET;
     }
 
     if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
         return sd_setup_write_same16_cmnd(cmd, false);
 
     return sd_setup_write_same10_cmnd(cmd, false);
 }
 
 static void sd_config_write_same(struct scsi_disk *sdkp)
 {
     struct request_queue *q = sdkp->disk->queue;
     unsigned int logical_block_size = sdkp->device->sector_size;
 
     if (sdkp->device->no_write_same) {
         sdkp->max_ws_blocks = 0;
         goto out;
     }
 
     /* Some devices can not handle block counts above 0xffff despite
      * supporting WRITE SAME(16). Consequently we default to 64k
      * blocks per I/O unless the device explicitly advertises a
      * bigger limit.
      */
     if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
         sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
                            (u32)SD_MAX_WS16_BLOCKS);
     else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
         sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
                            (u32)SD_MAX_WS10_BLOCKS);
     else {
         sdkp->device->no_write_same = 1;
         sdkp->max_ws_blocks = 0;
     }
 
     if (sdkp->lbprz && sdkp->lbpws)
         sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
     else if (sdkp->lbprz && sdkp->lbpws10)
         sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
     else if (sdkp->max_ws_blocks)
         sdkp->zeroing_mode = SD_ZERO_WS;
     else
         sdkp->zeroing_mode = SD_ZERO_WRITE;
 
     if (sdkp->max_ws_blocks &&
         sdkp->physical_block_size > logical_block_size) {
         /*
          * Reporting a maximum number of blocks that is not aligned
          * on the device physical size would cause a large write same
          * request to be split into physically unaligned chunks by
          * __blkdev_issue_write_zeroes() even if the caller of this
          * functions took care to align the large request. So make sure
          * the maximum reported is aligned to the device physical block
          * size. This is only an optional optimization for regular
          * disks, but this is mandatory to avoid failure of large write
          * same requests directed at sequential write required zones of
          * host-managed ZBC disks.
          */
         sdkp->max_ws_blocks =
             round_down(sdkp->max_ws_blocks,
                    bytes_to_logical(sdkp->device,
                             sdkp->physical_block_size));
     }
 
 out:
     blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
                      (logical_block_size >> 9));
 }
 
 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
 {
     struct request *rq = scsi_cmd_to_rq(cmd);
     struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
 
     /* flush requests don't perform I/O, zero the S/G table */
     memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 
     cmd->cmnd[0] = SYNCHRONIZE_CACHE;
     cmd->cmd_len = 10;
     cmd->transfersize = 0;
     cmd->allowed = sdkp->max_retries;
 
     rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
     return BLK_STS_OK;
 }
 
 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
                        sector_t lba, unsigned int nr_blocks,
                        unsigned char flags)
 {
     cmd->cmd_len = SD_EXT_CDB_SIZE;
     cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
     cmd->cmnd[7]  = 0x18; /* Additional CDB len */
     cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
     cmd->cmnd[10] = flags;
     put_unaligned_be64(lba, &cmd->cmnd[12]);
     put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
     put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
 
     return BLK_STS_OK;
 }
 
 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
                        sector_t lba, unsigned int nr_blocks,
                        unsigned char flags)
 {
     cmd->cmd_len  = 16;
     cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
     cmd->cmnd[1]  = flags;
     cmd->cmnd[14] = 0;
     cmd->cmnd[15] = 0;
     put_unaligned_be64(lba, &cmd->cmnd[2]);
     put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 
     return BLK_STS_OK;
 }
 
 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
                        sector_t lba, unsigned int nr_blocks,
                        unsigned char flags)
 {
     cmd->cmd_len = 10;
     cmd->cmnd[0] = write ? WRITE_10 : READ_10;
     cmd->cmnd[1] = flags;
     cmd->cmnd[6] = 0;
     cmd->cmnd[9] = 0;
     put_unaligned_be32(lba, &cmd->cmnd[2]);
     put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 
     return BLK_STS_OK;
 }
 
 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
                       sector_t lba, unsigned int nr_blocks,
                       unsigned char flags)
 {
     /* Avoid that 0 blocks gets translated into 256 blocks. */
     if (WARN_ON_ONCE(nr_blocks == 0))
         return BLK_STS_IOERR;
 
     if (unlikely(flags & 0x8)) {
         /*
          * This happens only if this drive failed 10byte rw
          * command with ILLEGAL_REQUEST during operation and
          * thus turned off use_10_for_rw.
          */
         scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
         return BLK_STS_IOERR;
     }
 
     cmd->cmd_len = 6;
     cmd->cmnd[0] = write ? WRITE_6 : READ_6;
     cmd->cmnd[1] = (lba >> 16) & 0x1f;
     cmd->cmnd[2] = (lba >> 8) & 0xff;
     cmd->cmnd[3] = lba & 0xff;
     cmd->cmnd[4] = nr_blocks;
     cmd->cmnd[5] = 0;
 
     return BLK_STS_OK;
 }
 
 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
 {
     struct request *rq = scsi_cmd_to_rq(cmd);
     struct scsi_device *sdp = cmd->device;
     struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
     sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
     sector_t threshold;
     unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
     unsigned int mask = logical_to_sectors(sdp, 1) - 1;
     bool write = rq_data_dir(rq) == WRITE;
     unsigned char protect, fua;
     blk_status_t ret;
     unsigned int dif;
     bool dix;
 
     ret = scsi_alloc_sgtables(cmd);
     if (ret != BLK_STS_OK)
         return ret;
 
     ret = BLK_STS_IOERR;
     if (!scsi_device_online(sdp) || sdp->changed) {
         scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
         goto fail;
     }
 
     if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->q->disk)) {
         scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
         goto fail;
     }
 
     if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
         scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
         goto fail;
     }
 
     /*
      * Some SD card readers can't handle accesses which touch the
      * last one or two logical blocks. Split accesses as needed.
      */
     threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
 
     if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
         if (lba < threshold) {
             /* Access up to the threshold but not beyond */
             nr_blocks = threshold - lba;
         } else {
             /* Access only a single logical block */
             nr_blocks = 1;
         }
     }
 
     if (req_op(rq) == REQ_OP_ZONE_APPEND) {
         ret = sd_zbc_prepare_zone_append(cmd, &lba, nr_blocks);
         if (ret)
             goto fail;
     }
 
     fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
     dix = scsi_prot_sg_count(cmd);
     dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
 
     if (dif || dix)
         protect = sd_setup_protect_cmnd(cmd, dix, dif);
     else
         protect = 0;
 
     if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
         ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
                      protect | fua);
     } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
         ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
                      protect | fua);
     } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
            sdp->use_10_for_rw || protect) {
         ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
                      protect | fua);
     } else {
         ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
                     protect | fua);
     }
 
     if (unlikely(ret != BLK_STS_OK))
         goto fail;
 
     /*
      * We shouldn't disconnect in the middle of a sector, so with a dumb
      * host adapter, it's safe to assume that we can at least transfer
      * this many bytes between each connect / disconnect.
      */
     cmd->transfersize = sdp->sector_size;
     cmd->underflow = nr_blocks << 9;
     cmd->allowed = sdkp->max_retries;
     cmd->sdb.length = nr_blocks * sdp->sector_size;
 
     SCSI_LOG_HLQUEUE(1,
              scmd_printk(KERN_INFO, cmd,
                      "%s: block=%llu, count=%d\n", __func__,
                      (unsigned long long)blk_rq_pos(rq),
                      blk_rq_sectors(rq)));
     SCSI_LOG_HLQUEUE(2,
              scmd_printk(KERN_INFO, cmd,
                      "%s %d/%u 512 byte blocks.\n",
                      write ? "writing" : "reading", nr_blocks,
                      blk_rq_sectors(rq)));
 
     /*
      * This indicates that the command is ready from our end to be queued.
      */
     return BLK_STS_OK;
 fail:
     scsi_free_sgtables(cmd);
     return ret;
 }
 
 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
 {
     struct request *rq = scsi_cmd_to_rq(cmd);
 
     switch (req_op(rq)) {
     case REQ_OP_DISCARD:
         switch (scsi_disk(rq->q->disk)->provisioning_mode) {
         case SD_LBP_UNMAP:
             return sd_setup_unmap_cmnd(cmd);
         case SD_LBP_WS16:
             return sd_setup_write_same16_cmnd(cmd, true);
         case SD_LBP_WS10:
             return sd_setup_write_same10_cmnd(cmd, true);
         case SD_LBP_ZERO:
             return sd_setup_write_same10_cmnd(cmd, false);
         default:
             return BLK_STS_TARGET;
         }
     case REQ_OP_WRITE_ZEROES:
         return sd_setup_write_zeroes_cmnd(cmd);
     case REQ_OP_FLUSH:
         return sd_setup_flush_cmnd(cmd);
     case REQ_OP_READ:
     case REQ_OP_WRITE:
     case REQ_OP_ZONE_APPEND:
         return sd_setup_read_write_cmnd(cmd);
     case REQ_OP_ZONE_RESET:
         return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
                            false);
     case REQ_OP_ZONE_RESET_ALL:
         return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
                            true);
     case REQ_OP_ZONE_OPEN:
         return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
     case REQ_OP_ZONE_CLOSE:
         return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
     case REQ_OP_ZONE_FINISH:
         return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
     default:
         WARN_ON_ONCE(1);
         return BLK_STS_NOTSUPP;
     }
 }
 
 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
 {
     struct request *rq = scsi_cmd_to_rq(SCpnt);
 
     if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
         mempool_free(rq->special_vec.bv_page, sd_page_pool);
 }
 
 static bool sd_need_revalidate(struct block_device *bdev,
         struct scsi_disk *sdkp)
 {
     if (sdkp->device->removable || sdkp->write_prot) {
         if (bdev_check_media_change(bdev))
             return true;
     }
 
     /*
      * Force a full rescan after ioctl(BLKRRPART).  While the disk state has
      * nothing to do with partitions, BLKRRPART is used to force a full
      * revalidate after things like a format for historical reasons.
      */
     return test_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
 }
 
 /**
  *  sd_open - open a scsi disk device
  *  @bdev: Block device of the scsi disk to open
  *  @mode: FMODE_* mask
  *
  *  Returns 0 if successful. Returns a negated errno value in case 
  *  of error.
  *
  *  Note: This can be called from a user context (e.g. fsck(1) )
  *  or from within the kernel (e.g. as a result of a mount(1) ).
  *  In the latter case @inode and @filp carry an abridged amount
  *  of information as noted above.
  *
  *  Locking: called with bdev->bd_disk->open_mutex held.
  **/
 static int sd_open(struct block_device *bdev, fmode_t mode)
 {
     struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
     struct scsi_device *sdev = sdkp->device;
     int retval;
 
     if (scsi_device_get(sdev))
         return -ENXIO;
 
     SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
 
     /*
      * If the device is in error recovery, wait until it is done.
      * If the device is offline, then disallow any access to it.
      */
     retval = -ENXIO;
     if (!scsi_block_when_processing_errors(sdev))
         goto error_out;
 
     if (sd_need_revalidate(bdev, sdkp))
         sd_revalidate_disk(bdev->bd_disk);
 
     /*
      * If the drive is empty, just let the open fail.
      */
     retval = -ENOMEDIUM;
     if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
         goto error_out;
 
     /*
      * If the device has the write protect tab set, have the open fail
      * if the user expects to be able to write to the thing.
      */
     retval = -EROFS;
     if (sdkp->write_prot && (mode & FMODE_WRITE))
         goto error_out;
 
     /*
      * It is possible that the disk changing stuff resulted in
      * the device being taken offline.  If this is the case,
      * report this to the user, and don't pretend that the
      * open actually succeeded.
      */
     retval = -ENXIO;
     if (!scsi_device_online(sdev))
         goto error_out;
 
     if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
         if (scsi_block_when_processing_errors(sdev))
             scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
     }
 
     return 0;
 
 error_out:
     scsi_device_put(sdev);
     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_disk->open_mutex held.
  **/
 static void sd_release(struct gendisk *disk, fmode_t mode)
 {
     struct scsi_disk *sdkp = scsi_disk(disk);
     struct scsi_device *sdev = sdkp->device;
 
     SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
 
     if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
         if (scsi_block_when_processing_errors(sdev))
             scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
     }
 
     scsi_device_put(sdev);
 }
 
 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));
 
     if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
         return -ENOIOCTLCMD;
 
     /*
      * 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)
         return error;
 
     if (is_sed_ioctl(cmd))
         return sed_ioctl(sdkp->opal_dev, cmd, p);
     return scsi_ioctl(sdp, mode, cmd, p);
 }
 
 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 = disk->private_data;
     struct scsi_device *sdp;
     int retval;
     bool disk_changed;
 
     if (!sdkp)
         return 0;
 
     sdp = sdkp->device;
     SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
 
     /*
      * If the device is offline, don't send any commands - just pretend as
      * if the command failed.  If the device ever comes back online, we
      * can deal with it then.  It is only because of unrecoverable errors
      * that we would ever take a device offline in the first place.
      */
     if (!scsi_device_online(sdp)) {
         set_media_not_present(sdkp);
         goto out;
     }
 
     /*
      * Using TEST_UNIT_READY enables differentiation between drive with
      * no cartridge loaded - NOT READY, drive with changed cartridge -
      * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
      *
      * Drives that auto spin down. eg iomega jaz 1G, will be started
      * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
      * sd_revalidate() is called.
      */
     if (scsi_block_when_processing_errors(sdp)) {
         struct scsi_sense_hdr sshdr = { 0, };
 
         retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, sdkp->max_retries,
                           &sshdr);
 
         /* failed to execute TUR, assume media not present */
         if (retval < 0 || 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.
      */
     disk_changed = sdp->changed;
     sdp->changed = 0;
     return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
 }
 
 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
 {
     int retries, res;
     struct scsi_device *sdp = sdkp->device;
     const int timeout = sdp->request_queue->rq_timeout
         * SD_FLUSH_TIMEOUT_MULTIPLIER;
     struct scsi_sense_hdr my_sshdr;
 
     if (!scsi_device_online(sdp))
         return -ENODEV;
 
     /* caller might not be interested in sense, but we need it */
     if (!sshdr)
         sshdr = &my_sshdr;
 
     for (retries = 3; retries > 0; --retries) {
         unsigned char cmd[10] = { 0 };
 
         cmd[0] = SYNCHRONIZE_CACHE;
         /*
          * Leave the rest of the command zero to indicate
          * flush everything.
          */
         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
                 timeout, sdkp->max_retries, 0, RQF_PM, NULL);
         if (res == 0)
             break;
     }
 
     if (res) {
         sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
 
         if (res < 0)
             return res;
 
         if (scsi_status_is_check_condition(res) &&
             scsi_sense_valid(sshdr)) {
             sd_print_sense_hdr(sdkp, sshdr);
 
             /* we need to evaluate the error return  */
             if (sshdr->asc == 0x3a ||   /* medium not present */
                 sshdr->asc == 0x20 ||   /* invalid command */
                 (sshdr->asc == 0x74 && sshdr->ascq == 0x71))    /* drive is password locked */
                 /* this is no error here */
                 return 0;
         }
 
         switch (host_byte(res)) {
         /* ignore errors due to racing a disconnection */
         case DID_BAD_TARGET:
         case DID_NO_CONNECT:
             return 0;
         /* signal the upper layer it might try again */
         case DID_BUS_BUSY:
         case DID_IMM_RETRY:
         case DID_REQUEUE:
         case DID_SOFT_ERROR:
             return -EBUSY;
         default:
             return -EIO;
         }
     }
     return 0;
 }
 
 static void sd_rescan(struct device *dev)
 {
     struct scsi_disk *sdkp = dev_get_drvdata(dev);
 
     sd_revalidate_disk(sdkp->disk);
 }
 
 static int sd_get_unique_id(struct gendisk *disk, u8 id[16],
         enum blk_unique_id type)
 {
     struct scsi_device *sdev = scsi_disk(disk)->device;
     const struct scsi_vpd *vpd;
     const unsigned char *d;
     int ret = -ENXIO, len;
 
     rcu_read_lock();
     vpd = rcu_dereference(sdev->vpd_pg83);
     if (!vpd)
         goto out_unlock;
 
     ret = -EINVAL;
     for (d = vpd->data + 4; d < vpd->data + vpd->len; d += d[3] + 4) {
         /* we only care about designators with LU association */
         if (((d[1] >> 4) & 0x3) != 0x00)
             continue;
         if ((d[1] & 0xf) != type)
             continue;
 
         /*
          * Only exit early if a 16-byte descriptor was found.  Otherwise
          * keep looking as one with more entropy might still show up.
          */
         len = d[3];
         if (len != 8 && len != 12 && len != 16)
             continue;
         ret = len;
         memcpy(id, d + 4, len);
         if (len == 16)
             break;
     }
 out_unlock:
     rcu_read_unlock();
     return ret;
 }
 
 static char sd_pr_type(enum pr_type type)
 {
     switch (type) {
     case PR_WRITE_EXCLUSIVE:
         return 0x01;
     case PR_EXCLUSIVE_ACCESS:
         return 0x03;
     case PR_WRITE_EXCLUSIVE_REG_ONLY:
         return 0x05;
     case PR_EXCLUSIVE_ACCESS_REG_ONLY:
         return 0x06;
     case PR_WRITE_EXCLUSIVE_ALL_REGS:
         return 0x07;
     case PR_EXCLUSIVE_ACCESS_ALL_REGS:
         return 0x08;
     default:
         return 0;
     }
 };
 
 static int sd_pr_command(struct block_device *bdev, u8 sa,
         u64 key, u64 sa_key, u8 type, u8 flags)
 {
     struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
     struct scsi_device *sdev = sdkp->device;
     struct scsi_sense_hdr sshdr;
     int result;
     u8 cmd[16] = { 0, };
     u8 data[24] = { 0, };
 
     cmd[0] = PERSISTENT_RESERVE_OUT;
     cmd[1] = sa;
     cmd[2] = type;
     put_unaligned_be32(sizeof(data), &cmd[5]);
 
     put_unaligned_be64(key, &data[0]);
     put_unaligned_be64(sa_key, &data[8]);
     data[20] = flags;
 
     result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
             &sshdr, SD_TIMEOUT, sdkp->max_retries, NULL);
 
     if (scsi_status_is_check_condition(result) &&
         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 void scsi_disk_free_disk(struct gendisk *disk)
 {
     struct scsi_disk *sdkp = scsi_disk(disk);
 
     put_device(&sdkp->disk_dev);
 }
 
 static const struct block_device_operations sd_fops = {
     .owner          = THIS_MODULE,
     .open           = sd_open,
     .release        = sd_release,
     .ioctl          = sd_ioctl,
     .getgeo         = sd_getgeo,
     .compat_ioctl       = blkdev_compat_ptr_ioctl,
     .check_events       = sd_check_events,
     .unlock_native_capacity = sd_unlock_native_capacity,
     .report_zones       = sd_zbc_report_zones,
     .get_unique_id      = sd_get_unique_id,
     .free_disk      = scsi_disk_free_disk,
     .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(scsi_cmd_to_rq(scmd)->q->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(scsi_cmd_to_rq(scmd)->q->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 = scsi_cmd_to_rq(scmd);
     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 request *req = scsi_cmd_to_rq(SCpnt);
     struct scsi_disk *sdkp = scsi_disk(req->q->disk);
     int sense_valid = 0;
     int sense_deferred = 0;
 
     switch (req_op(req)) {
     case REQ_OP_DISCARD:
     case REQ_OP_WRITE_ZEROES:
     case REQ_OP_ZONE_RESET:
     case REQ_OP_ZONE_RESET_ALL:
     case REQ_OP_ZONE_OPEN:
     case REQ_OP_ZONE_CLOSE:
     case REQ_OP_ZONE_FINISH:
         if (!result) {
             good_bytes = blk_rq_bytes(req);
             scsi_set_resid(SCpnt, 0);
         } else {
             good_bytes = 0;
             scsi_set_resid(SCpnt, blk_rq_bytes(req));
         }
         break;
     default:
         /*
          * In case of bogus fw or device, we could end up having
          * an unaligned partial completion. Check this here and force
          * alignment.
          */
         resid = scsi_get_resid(SCpnt);
         if (resid & (sector_size - 1)) {
             sd_printk(KERN_INFO, sdkp,
                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
                 resid, sector_size);
             scsi_print_command(SCpnt);
             resid = min(scsi_bufflen(SCpnt),
                     round_up(resid, sector_size));
             scsi_set_resid(SCpnt, resid);
         }
     }
 
     if (result) {
         sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
         if (sense_valid)
             sense_deferred = scsi_sense_is_deferred(&sshdr);
     }
     sdkp->medium_access_timed_out = 0;
 
     if (!scsi_status_is_check_condition(result) &&
         (!sense_valid || sense_deferred))
         goto out;
 
     switch (sshdr.sense_key) {
     case HARDWARE_ERROR:
     case MEDIUM_ERROR:
         good_bytes = sd_completed_bytes(SCpnt);
         break;
     case RECOVERED_ERROR:
         good_bytes = scsi_bufflen(SCpnt);
         break;
     case NO_SENSE:
         /* This indicates a false check condition, so ignore it.  An
          * unknown amount of data was transferred so treat it as an
          * error.
          */
         SCpnt->result = 0;
         memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
         break;
     case ABORTED_COMMAND:
         if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
             good_bytes = sd_completed_bytes(SCpnt);
         break;
     case ILLEGAL_REQUEST:
         switch (sshdr.asc) {
         case 0x10:  /* DIX: Host detected corruption */
             good_bytes = sd_completed_bytes(SCpnt);
             break;
         case 0x20:  /* INVALID COMMAND OPCODE */
         case 0x24:  /* INVALID FIELD IN CDB */
             switch (SCpnt->cmnd[0]) {
             case UNMAP:
                 sd_config_discard(sdkp, SD_LBP_DISABLE);
                 break;
             case WRITE_SAME_16:
             case WRITE_SAME:
                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
                     sd_config_discard(sdkp, SD_LBP_DISABLE);
                 } else {
                     sdkp->device->no_write_same = 1;
                     sd_config_write_same(sdkp);
                     req->rq_flags |= RQF_QUIET;
                 }
                 break;
             }
         }
         break;
     default:
         break;
     }
 
  out:
     if (sd_is_zoned(sdkp))
         good_bytes = sd_zbc_complete(SCpnt, good_bytes, &sshdr);
 
     SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
                        "sd_done: completed %d of %d bytes\n",
                        good_bytes, scsi_bufflen(SCpnt)));
 
     return good_bytes;
 }
 
 /*
  * spinup disk - called only in sd_revalidate_disk()
  */
 static void
 sd_spinup_disk(struct scsi_disk *sdkp)
 {
     unsigned char cmd[10];
     unsigned long spintime_expire = 0;
     int retries, spintime;
     unsigned int the_result;
     struct scsi_sense_hdr sshdr;
     int sense_valid = 0;
 
     spintime = 0;
 
     /* Spin up drives, as required.  Only do this at boot time */
     /* Spinup needs to be done for module loads too. */
     do {
         retries = 0;
 
         do {
             bool media_was_present = sdkp->media_present;
 
             cmd[0] = TEST_UNIT_READY;
             memset((void *) &cmd[1], 0, 9);
 
             the_result = scsi_execute_req(sdkp->device, cmd,
                               DMA_NONE, NULL, 0,
                               &sshdr, SD_TIMEOUT,
                               sdkp->max_retries, NULL);
 
             /*
              * If the drive has indicated to us that it
              * doesn't have any media in it, don't bother
              * with any more polling.
              */
             if (media_not_present(sdkp, &sshdr)) {
                 if (media_was_present)
                     sd_printk(KERN_NOTICE, sdkp, "Media removed, stopped polling\n");
                 return;
             }
 
             if (the_result)
                 sense_valid = scsi_sense_valid(&sshdr);
             retries++;
         } while (retries < 3 &&
              (!scsi_status_is_good(the_result) ||
               (scsi_status_is_check_condition(the_result) &&
               sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
 
         if (!scsi_status_is_check_condition(the_result)) {
             /* no sense, TUR either succeeded or failed
              * with a status error */
             if(!spintime && !scsi_status_is_good(the_result)) {
                 sd_print_result(sdkp, "Test Unit Ready failed",
                         the_result);
             }
             break;
         }
 
         /*
          * The device does not want the automatic start to be issued.
          */
         if (sdkp->device->no_start_on_add)
             break;
 
         if (sense_valid && sshdr.sense_key == NOT_READY) {
             if (sshdr.asc == 4 && sshdr.ascq == 3)
                 break;  /* manual intervention required */
             if (sshdr.asc == 4 && sshdr.ascq == 0xb)
                 break;  /* standby */
             if (sshdr.asc == 4 && sshdr.ascq == 0xc)
                 break;  /* unavailable */
             if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
                 break;  /* sanitize in progress */
             /*
              * Issue command to spin up drive when not ready
              */
             if (!spintime) {
                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
                 cmd[0] = START_STOP;
                 cmd[1] = 1; /* Return immediately */
                 memset((void *) &cmd[2], 0, 8);
                 cmd[4] = 1; /* Start spin cycle */
                 if (sdkp->device->start_stop_pwr_cond)
                     cmd[4] |= 1 << 4;
                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
                          NULL, 0, &sshdr,
                          SD_TIMEOUT, sdkp->max_retries,
                          NULL);
                 spintime_expire = jiffies + 100 * HZ;
                 spintime = 1;
             }
             /* Wait 1 second for next try */
             msleep(1000);
             printk(KERN_CONT ".");
 
         /*
          * Wait for USB flash devices with slow firmware.
          * Yes, this sense key/ASC combination shouldn't
          * occur here.  It's characteristic of these devices.
          */
         } else if (sense_valid &&
                 sshdr.sense_key == UNIT_ATTENTION &&
                 sshdr.asc == 0x28) {
             if (!spintime) {
                 spintime_expire = jiffies + 5 * HZ;
                 spintime = 1;
             }
             /* Wait 1 second for next try */
             msleep(1000);
         } else {
             /* we don't understand the sense code, so it's
              * probably pointless to loop */
             if(!spintime) {
                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
                 sd_print_sense_hdr(sdkp, &sshdr);
             }
             break;
         }
                 
     } while (spintime && time_before_eq(jiffies, spintime_expire));
 
     if (spintime) {
         if (scsi_status_is_good(the_result))
             printk(KERN_CONT "ready\n");
         else
             printk(KERN_CONT "not responding...\n");
     }
 }
 
 /*
  * Determine whether disk supports Data Integrity Field.
  */
 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
 {
     struct scsi_device *sdp = sdkp->device;
     u8 type;
 
     if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
         sdkp->protection_type = 0;
         return 0;
     }
 
     type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
 
     if (type > T10_PI_TYPE3_PROTECTION) {
         sd_printk(KERN_ERR, sdkp, "formatted with unsupported"  \
               " protection type %u. Disabling disk!\n",
               type);
         sdkp->protection_type = 0;
         return -ENODEV;
     }
 
     sdkp->protection_type = type;
 
     return 0;
 }
 
 static void sd_config_protection(struct scsi_disk *sdkp)
 {
     struct scsi_device *sdp = sdkp->device;
 
     if (!sdkp->first_scan)
         return;
 
     sd_dif_config_host(sdkp);
 
     if (!sdkp->protection_type)
         return;
 
     if (!scsi_host_dif_capable(sdp->host, sdkp->protection_type)) {
         sd_printk(KERN_NOTICE, sdkp,
               "Disabling DIF Type %u protection\n",
               sdkp->protection_type);
         sdkp->protection_type = 0;
     }
 
     sd_printk(KERN_NOTICE, sdkp, "Enabling DIF Type %u protection\n",
           sdkp->protection_type);
 }
 
 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 (sense_valid)
         sd_print_sense_hdr(sdkp, sshdr);
     else
         sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
 
     /*
      * Set dirty bit for removable devices if not ready -
      * sometimes drives will not report this properly.
      */
     if (sdp->removable &&
         sense_valid && sshdr->sense_key == NOT_READY)
         set_media_not_present(sdkp);
 
     /*
      * We used to set media_present to 0 here to indicate no media
      * in the drive, but some drives fail read capacity even with
      * media present, so we can't do that.
      */
     sdkp->capacity = 0; /* unknown mapped to zero - as usual */
 }
 
 #define RC16_LEN 32
 #if RC16_LEN > SD_BUF_SIZE
 #error RC16_LEN must not be more than SD_BUF_SIZE
 #endif
 
 #define READ_CAPACITY_RETRIES_ON_RESET  10
 
 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
                         unsigned char *buffer)
 {
     unsigned char cmd[16];
     struct scsi_sense_hdr sshdr;
     int sense_valid = 0;
     int the_result;
     int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
     unsigned int alignment;
     unsigned long long lba;
     unsigned sector_size;
 
     if (sdp->no_read_capacity_16)
         return -EINVAL;
 
     do {
         memset(cmd, 0, 16);
         cmd[0] = SERVICE_ACTION_IN_16;
         cmd[1] = SAI_READ_CAPACITY_16;
         cmd[13] = RC16_LEN;
         memset(buffer, 0, RC16_LEN);
 
         the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
                     buffer, RC16_LEN, &sshdr,
                     SD_TIMEOUT, sdkp->max_retries, NULL);
 
         if (media_not_present(sdkp, &sshdr))
             return -ENODEV;
 
         if (the_result > 0) {
             sense_valid = scsi_sense_valid(&sshdr);
             if (sense_valid &&
                 sshdr.sense_key == ILLEGAL_REQUEST &&
                 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
                 sshdr.ascq == 0x00)
                 /* Invalid Command Operation Code or
                  * Invalid Field in CDB, just retry
                  * silently with RC10 */
                 return -EINVAL;
             if (sense_valid &&
                 sshdr.sense_key == UNIT_ATTENTION &&
                 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
                 /* Device reset might occur several times,
                  * give it one more chance */
                 if (--reset_retries > 0)
                     continue;
         }
         retries--;
 
     } while (the_result && retries);
 
     if (the_result) {
         sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
         read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
         return -EINVAL;
     }
 
     sector_size = get_unaligned_be32(&buffer[8]);
     lba = get_unaligned_be64(&buffer[0]);
 
     if (sd_read_protection_type(sdkp, buffer) < 0) {
         sdkp->capacity = 0;
         return -ENODEV;
     }
 
     /* Logical blocks per physical block exponent */
     sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
 
     /* RC basis */
     sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
 
     /* Lowest aligned logical block */
     alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
     blk_queue_alignment_offset(sdp->request_queue, alignment);
     if (alignment && sdkp->first_scan)
         sd_printk(KERN_NOTICE, sdkp,
               "physical block alignment offset: %u\n", alignment);
 
     if (buffer[14] & 0x80) { /* LBPME */
         sdkp->lbpme = 1;
 
         if (buffer[14] & 0x40) /* LBPRZ */
             sdkp->lbprz = 1;
 
         sd_config_discard(sdkp, SD_LBP_WS16);
     }
 
     sdkp->capacity = lba + 1;
     return sector_size;
 }
 
 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
                         unsigned char *buffer)
 {
     unsigned char cmd[16];
     struct scsi_sense_hdr sshdr;
     int sense_valid = 0;
     int the_result;
     int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
     sector_t lba;
     unsigned sector_size;
 
     do {
         cmd[0] = READ_CAPACITY;
         memset(&cmd[1], 0, 9);
         memset(buffer, 0, 8);
 
         the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
                     buffer, 8, &sshdr,
                     SD_TIMEOUT, sdkp->max_retries, NULL);
 
         if (media_not_present(sdkp, &sshdr))
             return -ENODEV;
 
         if (the_result > 0) {
             sense_valid = scsi_sense_valid(&sshdr);
             if (sense_valid &&
                 sshdr.sense_key == UNIT_ATTENTION &&
                 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
                 /* Device reset might occur several times,
                  * give it one more chance */
                 if (--reset_retries > 0)
                     continue;
         }
         retries--;
 
     } while (the_result && retries);
 
     if (the_result) {
         sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
         read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
         return -EINVAL;
     }
 
     sector_size = get_unaligned_be32(&buffer[4]);
     lba = get_unaligned_be32(&buffer[0]);
 
     if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
         /* Some buggy (usb cardreader) devices return an lba of
            0xffffffff when the want to report a size of 0 (with
            which they really mean no media is present) */
         sdkp->capacity = 0;
         sdkp->physical_block_size = sector_size;
         return sector_size;
     }
 
     sdkp->capacity = lba + 1;
     sdkp->physical_block_size = sector_size;
     return sector_size;
 }
 
 static int sd_try_rc16_first(struct scsi_device *sdp)
 {
     if (sdp->host->max_cmd_len < 16)
         return 0;
     if (sdp->try_rc_10_first)
         return 0;
     if (sdp->scsi_level > SCSI_SPC_2)
         return 1;
     if (scsi_device_protection(sdp))
         return 1;
     return 0;
 }
 
 /*
  * read disk capacity
  */
 static void
 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
 {
     int sector_size;
     struct scsi_device *sdp = sdkp->device;
 
     if (sd_try_rc16_first(sdp)) {
         sector_size = read_capacity_16(sdkp, sdp, buffer);
         if (sector_size == -EOVERFLOW)
             goto got_data;
         if (sector_size == -ENODEV)
             return;
         if (sector_size < 0)
             sector_size = read_capacity_10(sdkp, sdp, buffer);
         if (sector_size < 0)
             return;
     } else {
         sector_size = read_capacity_10(sdkp, sdp, buffer);
         if (sector_size == -EOVERFLOW)
             goto got_data;
         if (sector_size < 0)
             return;
         if ((sizeof(sdkp->capacity) > 4) &&
             (sdkp->capacity > 0xffffffffULL)) {
             int old_sector_size = sector_size;
             sd_printk(KERN_NOTICE, sdkp, "Very big device. "
                     "Trying to use READ CAPACITY(16).\n");
             sector_size = read_capacity_16(sdkp, sdp, buffer);
             if (sector_size < 0) {
                 sd_printk(KERN_NOTICE, sdkp,
                     "Using 0xffffffff as device size\n");
                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
                 sector_size = old_sector_size;
                 goto got_data;
             }
             /* Remember that READ CAPACITY(16) succeeded */
             sdp->try_rc_10_first = 0;
         }
     }
 
     /* Some devices are known to return the total number of blocks,
      * not the highest block number.  Some devices have versions
      * which do this and others which do not.  Some devices we might
      * suspect of doing this but we don't know for certain.
      *
      * If we know the reported capacity is wrong, decrement it.  If
      * we can only guess, then assume the number of blocks is even
      * (usually true but not always) and err on the side of lowering
      * the capacity.
      */
     if (sdp->fix_capacity ||
         (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
         sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
                 "from its reported value: %llu\n",
                 (unsigned long long) sdkp->capacity);
         --sdkp->capacity;
     }
 
 got_data:
     if (sector_size == 0) {
         sector_size = 512;
         sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
               "assuming 512.\n");
     }
 
     if (sector_size != 512 &&
         sector_size != 1024 &&
         sector_size != 2048 &&
         sector_size != 4096) {
         sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
               sector_size);
         /*
          * The user might want to re-format the drive with
          * a supported sectorsize.  Once this happens, it
          * would be relatively trivial to set the thing up.
          * For this reason, we leave the thing in the table.
          */
         sdkp->capacity = 0;
         /*
          * set a bogus sector size so the normal read/write
          * logic in the block layer will eventually refuse any
          * request on this device without tripping over power
          * of two sector size assumptions
          */
         sector_size = 512;
     }
     blk_queue_logical_block_size(sdp->request_queue, sector_size);
     blk_queue_physical_block_size(sdp->request_queue,
                       sdkp->physical_block_size);
     sdkp->device->sector_size = sector_size;
 
     if (sdkp->capacity > 0xffffffff)
         sdp->use_16_for_rw = 1;
 
 }
 
 /*
  * Print disk capacity
  */
 static void
 sd_print_capacity(struct scsi_disk *sdkp,
           sector_t old_capacity)
 {
     int sector_size = sdkp->device->sector_size;
     char cap_str_2[10], cap_str_10[10];
 
     if (!sdkp->first_scan && old_capacity == sdkp->capacity)
         return;
 
     string_get_size(sdkp->capacity, sector_size,
             STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
     string_get_size(sdkp->capacity, sector_size,
             STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
 
     sd_printk(KERN_NOTICE, sdkp,
           "%llu %d-byte logical blocks: (%s/%s)\n",
           (unsigned long long)sdkp->capacity,
           sector_size, cap_str_10, cap_str_2);
 
     if (sdkp->physical_block_size != sector_size)
         sd_printk(KERN_NOTICE, sdkp,
               "%u-byte physical blocks\n",
               sdkp->physical_block_size);
 }
 
 /* called with buffer of length 512 */
 static inline int
 sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage,
          unsigned char *buffer, int len, struct scsi_mode_data *data,
          struct scsi_sense_hdr *sshdr)
 {
     /*
      * If we must use MODE SENSE(10), make sure that the buffer length
      * is at least 8 bytes so that the mode sense header fits.
      */
     if (sdkp->device->use_10_for_ms && len < 8)
         len = 8;
 
     return scsi_mode_sense(sdkp->device, dbd, modepage, buffer, len,
                    SD_TIMEOUT, sdkp->max_retries, data,
                    sshdr);
 }
 
 /*
  * read write protect setting, if possible - called only in sd_revalidate_disk()
  * called with buffer of length SD_BUF_SIZE
  */
 static void
 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
 {
     int res;
     struct scsi_device *sdp = sdkp->device;
     struct scsi_mode_data data;
     int old_wp = sdkp->write_prot;
 
     set_disk_ro(sdkp->disk, 0);
     if (sdp->skip_ms_page_3f) {
         sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
         return;
     }
 
     if (sdp->use_192_bytes_for_3f) {
         res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 192, &data, NULL);
     } else {
         /*
          * First attempt: ask for all pages (0x3F), but only 4 bytes.
          * We have to start carefully: some devices hang if we ask
          * for more than is available.
          */
         res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 4, &data, NULL);
 
         /*
          * Second attempt: ask for page 0 When only page 0 is
          * implemented, a request for page 3F may return Sense Key
          * 5: Illegal Request, Sense Code 24: Invalid field in
          * CDB.
          */
         if (res < 0)
             res = sd_do_mode_sense(sdkp, 0, 0, buffer, 4, &data, NULL);
 
         /*
          * Third attempt: ask 255 bytes, as we did earlier.
          */
         if (res < 0)
             res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 255,
                            &data, NULL);
     }
 
     if (res < 0) {
         sd_first_printk(KERN_WARNING, sdkp,
               "Test WP failed, assume Write Enabled\n");
     } else {
         sdkp->write_prot = ((data.device_specific & 0x80) != 0);
         set_disk_ro(sdkp->disk, sdkp->write_prot);
         if (sdkp->first_scan || old_wp != sdkp->write_prot) {
             sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
                   sdkp->write_prot ? "on" : "off");
             sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
         }
     }
 }
 
 /*
  * sd_read_cache_type - called only from sd_revalidate_disk()
  * called with buffer of length SD_BUF_SIZE
  */
 static void
 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
 {
     int len = 0, res;
     struct scsi_device *sdp = sdkp->device;
 
     int dbd;
     int modepage;
     int first_len;
     struct scsi_mode_data data;
     struct scsi_sense_hdr sshdr;
     int old_wce = sdkp->WCE;
     int old_rcd = sdkp->RCD;
     int old_dpofua = sdkp->DPOFUA;
 
 
     if (sdkp->cache_override)
         return;
 
     first_len = 4;
     if (sdp->skip_ms_page_8) {
         if (sdp->type == TYPE_RBC)
             goto defaults;
         else {
             if (sdp->skip_ms_page_3f)
                 goto defaults;
             modepage = 0x3F;
             if (sdp->use_192_bytes_for_3f)
                 first_len = 192;
             dbd = 0;
         }
     } else if (sdp->type == TYPE_RBC) {
         modepage = 6;
         dbd = 8;
     } else {
         modepage = 8;
         dbd = 0;
     }
 
     /* cautiously ask */
     res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, first_len,
             &data, &sshdr);
 
     if (res < 0)
         goto bad_sense;
 
     if (!data.header_length) {
         modepage = 6;
         first_len = 0;
         sd_first_printk(KERN_ERR, sdkp,
                 "Missing header in MODE_SENSE response\n");
     }
 
     /* that went OK, now ask for the proper length */
     len = data.length;
 
     /*
      * We're only interested in the first three bytes, actually.
      * But the data cache page is defined for the first 20.
      */
     if (len < 3)
         goto bad_sense;
     else if (len > SD_BUF_SIZE) {
         sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
               "data from %d to %d bytes\n", len, SD_BUF_SIZE);
         len = SD_BUF_SIZE;
     }
     if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
         len = 192;
 
     /* Get the data */
     if (len > first_len)
         res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len,
                 &data, &sshdr);
 
     if (!res) {
         int offset = data.header_length + data.block_descriptor_length;
 
         while (offset < len) {
             u8 page_code = buffer[offset] & 0x3F;
             u8 spf       = buffer[offset] & 0x40;
 
             if (page_code == 8 || page_code == 6) {
                 /* We're interested only in the first 3 bytes.
                  */
                 if (len - offset <= 2) {
                     sd_first_printk(KERN_ERR, sdkp,
                         "Incomplete mode parameter "
                             "data\n");
                     goto defaults;
                 } else {
                     modepage = page_code;
                     goto Page_found;
                 }
             } else {
                 /* Go to the next page */
                 if (spf && len - offset > 3)
                     offset += 4 + (buffer[offset+2] << 8) +
                         buffer[offset+3];
                 else if (!spf && len - offset > 1)
                     offset += 2 + buffer[offset+1];
                 else {
                     sd_first_printk(KERN_ERR, sdkp,
                             "Incomplete mode "
                             "parameter data\n");
                     goto defaults;
                 }
             }
         }
 
         sd_first_printk(KERN_WARNING, 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_WARNING, sdkp,
                 "Assuming drive cache: write through\n");
         sdkp->WCE = 0;
     }
     sdkp->RCD = 0;
     sdkp->DPOFUA = 0;
 }
 
 /*
  * The ATO bit indicates whether the DIF application tag is available
  * for use by the operating system.
  */
 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
 {
     int res, offset;
     struct scsi_device *sdp = sdkp->device;
     struct scsi_mode_data data;
     struct scsi_sense_hdr sshdr;
 
     if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
         return;
 
     if (sdkp->protection_type == 0)
         return;
 
     res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
                   sdkp->max_retries, &data, &sshdr);
 
     if (res < 0 || !data.header_length ||
         data.length < 6) {
         sd_first_printk(KERN_WARNING, sdkp,
               "getting Control mode page failed, assume no ATO\n");
 
         if (scsi_sense_valid(&sshdr))
             sd_print_sense_hdr(sdkp, &sshdr);
 
         return;
     }
 
     offset = data.header_length + data.block_descriptor_length;
 
     if ((buffer[offset] & 0x3f) != 0x0a) {
         sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
         return;
     }
 
     if ((buffer[offset + 5] & 0x80) == 0)
         return;
 
     sdkp->ATO = 1;
 
     return;
 }
 
 /**
  * sd_read_block_limits - Query disk device for preferred I/O sizes.
  * @sdkp: disk to query
  */
 static void sd_read_block_limits(struct scsi_disk *sdkp)
 {
     struct scsi_vpd *vpd;
 
     rcu_read_lock();
 
     vpd = rcu_dereference(sdkp->device->vpd_pgb0);
     if (!vpd || vpd->len < 16)
         goto out;
 
     sdkp->min_xfer_blocks = get_unaligned_be16(&vpd->data[6]);
     sdkp->max_xfer_blocks = get_unaligned_be32(&vpd->data[8]);
     sdkp->opt_xfer_blocks = get_unaligned_be32(&vpd->data[12]);
 
     if (vpd->len >= 64) {
         unsigned int lba_count, desc_count;
 
         sdkp->max_ws_blocks = (u32)get_unaligned_be64(&vpd->data[36]);
 
         if (!sdkp->lbpme)
             goto out;
 
         lba_count = get_unaligned_be32(&vpd->data[20]);
         desc_count = get_unaligned_be32(&vpd->data[24]);
 
         if (lba_count && desc_count)
             sdkp->max_unmap_blocks = lba_count;
 
         sdkp->unmap_granularity = get_unaligned_be32(&vpd->data[28]);
 
         if (vpd->data[32] & 0x80)
             sdkp->unmap_alignment =
                 get_unaligned_be32(&vpd->data[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:
     rcu_read_unlock();
 }
 
 /**
  * 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;
     struct scsi_vpd *vpd;
     u16 rot;
     u8 zoned;
 
     rcu_read_lock();
     vpd = rcu_dereference(sdkp->device->vpd_pgb1);
 
     if (!vpd || vpd->len < 8) {
         rcu_read_unlock();
             return;
     }
 
     rot = get_unaligned_be16(&vpd->data[4]);
     zoned = (vpd->data[8] >> 4) & 3;
     rcu_read_unlock();
 
     if (rot == 1) {
         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
         blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
     }
 
     if (sdkp->device->type == TYPE_ZBC) {
         /* Host-managed */
         disk_set_zoned(sdkp->disk, BLK_ZONED_HM);
     } else {
         sdkp->zoned = zoned;
         if (sdkp->zoned == 1) {
             /* Host-aware */
             disk_set_zoned(sdkp->disk, BLK_ZONED_HA);
         } else {
             /* Regular disk or drive managed disk */
             disk_set_zoned(sdkp->disk, BLK_ZONED_NONE);
         }
     }
 
     if (!sdkp->first_scan)
         return;
 
     if (blk_queue_is_zoned(q)) {
         sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
               q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
     } else {
         if (sdkp->zoned == 1)
             sd_printk(KERN_NOTICE, sdkp,
                   "Host-aware SMR disk used as regular disk\n");
         else if (sdkp->zoned == 2)
             sd_printk(KERN_NOTICE, sdkp,
                   "Drive-managed SMR disk\n");
     }
 }
 
 /**
  * sd_read_block_provisioning - Query provisioning VPD page
  * @sdkp: disk to query
  */
 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
 {
     struct scsi_vpd *vpd;
 
     if (sdkp->lbpme == 0)
         return;
 
     rcu_read_lock();
     vpd = rcu_dereference(sdkp->device->vpd_pgb2);
 
     if (!vpd || vpd->len < 8) {
         rcu_read_unlock();
         return;
     }
 
     sdkp->lbpvpd    = 1;
     sdkp->lbpu  = (vpd->data[5] >> 7) & 1; /* UNMAP */
     sdkp->lbpws = (vpd->data[5] >> 6) & 1; /* WRITE SAME(16) w/ UNMAP */
     sdkp->lbpws10   = (vpd->data[5] >> 5) & 1; /* WRITE SAME(10) w/ UNMAP */
     rcu_read_unlock();
 }
 
 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) {
         struct scsi_vpd *vpd;
 
         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).
          */
         rcu_read_lock();
         vpd = rcu_dereference(sdev->vpd_pg89);
         if (vpd)
             sdev->no_write_same = 1;
         rcu_read_unlock();
     }
 
     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;
 }
 
 static inline sector_t sd64_to_sectors(struct scsi_disk *sdkp, u8 *buf)
 {
     return logical_to_sectors(sdkp->device, get_unaligned_be64(buf));
 }
 
 /**
  * sd_read_cpr - Query concurrent positioning ranges
  * @sdkp:   disk to query
  */
 static void sd_read_cpr(struct scsi_disk *sdkp)
 {
     struct blk_independent_access_ranges *iars = NULL;
     unsigned char *buffer = NULL;
     unsigned int nr_cpr = 0;
     int i, vpd_len, buf_len = SD_BUF_SIZE;
     u8 *desc;
 
     /*
      * We need to have the capacity set first for the block layer to be
      * able to check the ranges.
      */
     if (sdkp->first_scan)
         return;
 
     if (!sdkp->capacity)
         goto out;
 
     /*
      * Concurrent Positioning Ranges VPD: there can be at most 256 ranges,
      * leading to a maximum page size of 64 + 256*32 bytes.
      */
     buf_len = 64 + 256*32;
     buffer = kmalloc(buf_len, GFP_KERNEL);
     if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb9, buffer, buf_len))
         goto out;
 
     /* We must have at least a 64B header and one 32B range descriptor */
     vpd_len = get_unaligned_be16(&buffer[2]) + 4;
     if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) {
         sd_printk(KERN_ERR, sdkp,
               "Invalid Concurrent Positioning Ranges VPD page\n");
         goto out;
     }
 
     nr_cpr = (vpd_len - 64) / 32;
     if (nr_cpr == 1) {
         nr_cpr = 0;
         goto out;
     }
 
     iars = disk_alloc_independent_access_ranges(sdkp->disk, nr_cpr);
     if (!iars) {
         nr_cpr = 0;
         goto out;
     }
 
     desc = &buffer[64];
     for (i = 0; i < nr_cpr; i++, desc += 32) {
         if (desc[0] != i) {
             sd_printk(KERN_ERR, sdkp,
                 "Invalid Concurrent Positioning Range number\n");
             nr_cpr = 0;
             break;
         }
 
         iars->ia_range[i].sector = sd64_to_sectors(sdkp, desc + 8);
         iars->ia_range[i].nr_sectors = sd64_to_sectors(sdkp, desc + 16);
     }
 
 out:
     disk_set_independent_access_ranges(sdkp->disk, iars);
     if (nr_cpr && sdkp->nr_actuators != nr_cpr) {
         sd_printk(KERN_NOTICE, sdkp,
               "%u concurrent positioning ranges\n", nr_cpr);
         sdkp->nr_actuators = nr_cpr;
     }
 
     kfree(buffer);
 }
 
 static bool sd_validate_min_xfer_size(struct scsi_disk *sdkp)
 {
     struct scsi_device *sdp = sdkp->device;
     unsigned int min_xfer_bytes =
         logical_to_bytes(sdp, sdkp->min_xfer_blocks);
 
     if (sdkp->min_xfer_blocks == 0)
         return false;
 
     if (min_xfer_bytes & (sdkp->physical_block_size - 1)) {
         sd_first_printk(KERN_WARNING, sdkp,
                 "Preferred minimum I/O size %u bytes not a " \
                 "multiple of physical block size (%u bytes)\n",
                 min_xfer_bytes, sdkp->physical_block_size);
         sdkp->min_xfer_blocks = 0;
         return false;
     }
 
     sd_first_printk(KERN_INFO, sdkp, "Preferred minimum I/O size %u bytes\n",
             min_xfer_bytes);
     return true;
 }
 
 /*
  * Determine the device's preferred I/O size for reads and writes
  * unless the reported value is unreasonably small, large, not a
  * multiple of the physical block size, or simply garbage.
  */
 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
                       unsigned int dev_max)
 {
     struct scsi_device *sdp = sdkp->device;
     unsigned int opt_xfer_bytes =
         logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
     unsigned int min_xfer_bytes =
         logical_to_bytes(sdp, sdkp->min_xfer_blocks);
 
     if (sdkp->opt_xfer_blocks == 0)
         return false;
 
     if (sdkp->opt_xfer_blocks > dev_max) {
         sd_first_printk(KERN_WARNING, sdkp,
                 "Optimal transfer size %u logical blocks " \
                 "> dev_max (%u logical blocks)\n",
                 sdkp->opt_xfer_blocks, dev_max);
         return false;
     }
 
     if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
         sd_first_printk(KERN_WARNING, sdkp,
                 "Optimal transfer size %u logical blocks " \
                 "> sd driver limit (%u logical blocks)\n",
                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
         return false;
     }
 
     if (opt_xfer_bytes < PAGE_SIZE) {
         sd_first_printk(KERN_WARNING, sdkp,
                 "Optimal transfer size %u bytes < " \
                 "PAGE_SIZE (%u bytes)\n",
                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
         return false;
     }
 
     if (min_xfer_bytes && opt_xfer_bytes % min_xfer_bytes) {
         sd_first_printk(KERN_WARNING, sdkp,
                 "Optimal transfer size %u bytes not a " \
                 "multiple of preferred minimum block " \
                 "size (%u bytes)\n",
                 opt_xfer_bytes, min_xfer_bytes);
         return false;
     }
 
     if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
         sd_first_printk(KERN_WARNING, sdkp,
                 "Optimal transfer size %u bytes not a " \
                 "multiple of physical block size (%u bytes)\n",
                 opt_xfer_bytes, sdkp->physical_block_size);
         return false;
     }
 
     sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
             opt_xfer_bytes);
     return true;
 }
 
 /**
  *  sd_revalidate_disk - called the first time a new disk is seen,
  *  performs disk spin up, read_capacity, etc.
  *  @disk: struct gendisk we care about
  **/
 static int sd_revalidate_disk(struct gendisk *disk)
 {
     struct scsi_disk *sdkp = scsi_disk(disk);
     struct scsi_device *sdp = sdkp->device;
     struct request_queue *q = sdkp->disk->queue;
     sector_t old_capacity = sdkp->capacity;
     unsigned char *buffer;
     unsigned int dev_max, rw_max;
 
     SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
                       "sd_revalidate_disk\n"));
 
     /*
      * If the device is offline, don't try and read capacity or any
      * of the other niceties.
      */
     if (!scsi_device_online(sdp))
         goto out;
 
     buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
     if (!buffer) {
         sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
               "allocation failure.\n");
         goto out;
     }
 
     sd_spinup_disk(sdkp);
 
     /*
      * Without media there is no reason to ask; moreover, some devices
      * react badly if we do.
      */
     if (sdkp->media_present) {
         sd_read_capacity(sdkp, buffer);
 
         /*
          * set the default to rotational.  All non-rotational devices
          * support the block characteristics VPD page, which will
          * cause this to be updated correctly and any device which
          * doesn't support it should be treated as rotational.
          */
         blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
         blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
 
         if (scsi_device_supports_vpd(sdp)) {
             sd_read_block_provisioning(sdkp);
             sd_read_block_limits(sdkp);
             sd_read_block_characteristics(sdkp);
             sd_zbc_read_zones(sdkp, buffer);
             sd_read_cpr(sdkp);
         }
 
         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);
         sd_config_protection(sdkp);
     }
 
     /*
      * We now have all cache related info, determine how we deal
      * with flush requests.
      */
     sd_set_flush_flag(sdkp);
 
     /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
     dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
 
     /* Some devices report a maximum block count for READ/WRITE requests. */
     dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
     q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
 
     if (sd_validate_min_xfer_size(sdkp))
         blk_queue_io_min(sdkp->disk->queue,
                  logical_to_bytes(sdp, sdkp->min_xfer_blocks));
     else
         blk_queue_io_min(sdkp->disk->queue, 0);
 
     if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
         q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
         rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
     } else {
         q->limits.io_opt = 0;
         rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
                       (sector_t)BLK_DEF_MAX_SECTORS);
     }
 
     /*
      * Limit default to SCSI host optimal sector limit if set. There may be
      * an impact on performance for when the size of a request exceeds this
      * host limit.
      */
     rw_max = min_not_zero(rw_max, sdp->host->opt_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_and_notify(disk, logical_to_sectors(sdp, sdkp->capacity));
     sd_config_write_same(sdkp);
     kfree(buffer);
 
     /*
      * For a zoned drive, revalidating the zones can be done only once
      * the gendisk capacity is set. So if this fails, set back the gendisk
      * capacity to 0.
      */
     if (sd_zbc_revalidate_zones(sdkp))
         set_capacity_and_notify(disk, 0);
 
  out:
     return 0;
 }
 
 /**
  *  sd_unlock_native_capacity - unlock native capacity
  *  @disk: struct gendisk to set capacity for
  *
  *  Block layer calls this function if it detects that partitions
  *  on @disk reach beyond the end of the device.  If the SCSI host
  *  implements ->unlock_native_capacity() method, it's invoked to
  *  give it a chance to adjust the device capacity.
  *
  *  CONTEXT:
  *  Defined by block layer.  Might sleep.
  */
 static void sd_unlock_native_capacity(struct gendisk *disk)
 {
     struct scsi_device *sdev = scsi_disk(disk)->device;
 
     if (sdev->host->hostt->unlock_native_capacity)
         sdev->host->hostt->unlock_native_capacity(sdev);
 }
 
 /**
  *  sd_format_disk_name - format disk name
  *  @prefix: name prefix - ie. "sd" for SCSI disks
  *  @index: index of the disk to format name for
  *  @buf: output buffer
  *  @buflen: length of the output buffer
  *
  *  SCSI disk names starts at sda.  The 26th device is sdz and the
  *  27th is sdaa.  The last one for two lettered suffix is sdzz
  *  which is followed by sdaaa.
  *
  *  This is basically 26 base counting with one extra 'nil' entry
  *  at the beginning from the second digit on and can be
  *  determined using similar method as 26 base conversion with the
  *  index shifted -1 after each digit is computed.
  *
  *  CONTEXT:
  *  Don't care.
  *
  *  RETURNS:
  *  0 on success, -errno on failure.
  */
 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
 {
     const int base = 'z' - 'a' + 1;
     char *begin = buf + strlen(prefix);
     char *end = buf + buflen;
     char *p;
     int unit;
 
     p = end - 1;
     *p = '\0';
     unit = base;
     do {
         if (p == begin)
             return -EINVAL;
         *--p = 'a' + (index % unit);
         index = (index / unit) - 1;
     } while (index >= 0);
 
     memmove(begin, p, end - p);
     memcpy(buf, prefix, strlen(prefix));
 
     return 0;
 }
 
 /**
  *  sd_probe - called during driver initialization and whenever a
  *  new scsi device is attached to the system. It is called once
  *  for each scsi device (not just disks) present.
  *  @dev: pointer to device object
  *
  *  Returns 0 if successful (or not interested in this scsi device 
  *  (e.g. scanner)); 1 when there is an error.
  *
  *  Note: this function is invoked from the scsi mid-level.
  *  This function sets up the mapping between a given 
  *  <host,channel,id,lun> (found in sdp) and new device name 
  *  (e.g. /dev/sda). More precisely it is the block device major 
  *  and minor number that is chosen here.
  *
  *  Assume sd_probe is not re-entrant (for time being)
  *  Also think about sd_probe() and sd_remove() running coincidentally.
  **/
 static int sd_probe(struct device *dev)
 {
     struct scsi_device *sdp = to_scsi_device(dev);
     struct scsi_disk *sdkp;
     struct gendisk *gd;
     int index;
     int error;
 
     scsi_autopm_get_device(sdp);
     error = -ENODEV;
     if (sdp->type != TYPE_DISK &&
         sdp->type != TYPE_ZBC &&
         sdp->type != TYPE_MOD &&
         sdp->type != TYPE_RBC)
         goto out;
 
     if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && sdp->type == TYPE_ZBC) {
         sdev_printk(KERN_WARNING, sdp,
                 "Unsupported ZBC host-managed device.\n");
         goto out;
     }
 
     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 = blk_mq_alloc_disk_for_queue(sdp->request_queue,
                      &sd_bio_compl_lkclass);
     if (!gd)
         goto out_free;
 
     index = ida_alloc(&sd_index_ida, GFP_KERNEL);
     if (index < 0) {
         sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
         goto out_put;
     }
 
     error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
     if (error) {
         sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
         goto out_free_index;
     }
 
     sdkp->device = sdp;
     sdkp->disk = gd;
     sdkp->index = index;
     sdkp->max_retries = SD_MAX_RETRIES;
     atomic_set(&sdkp->openers, 0);
     atomic_set(&sdkp->device->ioerr_cnt, 0);
 
     if (!sdp->request_queue->rq_timeout) {
         if (sdp->type != TYPE_MOD)
             blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
         else
             blk_queue_rq_timeout(sdp->request_queue,
                          SD_MOD_TIMEOUT);
     }
 
     device_initialize(&sdkp->disk_dev);
     sdkp->disk_dev.parent = get_device(dev);
     sdkp->disk_dev.class = &sd_disk_class;
     dev_set_name(&sdkp->disk_dev, "%s", dev_name(dev));
 
     error = device_add(&sdkp->disk_dev);
     if (error) {
         put_device(&sdkp->disk_dev);
         goto out;
     }
 
     dev_set_drvdata(dev, sdkp);
 
     gd->major = sd_major((index & 0xf0) >> 4);
     gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
     gd->minors = SD_MINORS;
 
     gd->fops = &sd_fops;
     gd->private_data = sdkp;
 
     /* 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);
 
     if (sdp->removable) {
         gd->flags |= GENHD_FL_REMOVABLE;
         gd->events |= DISK_EVENT_MEDIA_CHANGE;
         gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
     }
 
     blk_pm_runtime_init(sdp->request_queue, dev);
     if (sdp->rpm_autosuspend) {
         pm_runtime_set_autosuspend_delay(dev,
             sdp->host->hostt->rpm_autosuspend_delay);
     }
 
     error = device_add_disk(dev, gd, NULL);
     if (error) {
         put_device(&sdkp->disk_dev);
         put_disk(gd);
         goto out;
     }
 
     if (sdkp->security) {
         sdkp->opal_dev = init_opal_dev(sdkp, &sd_sec_submit);
         if (sdkp->opal_dev)
             sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
     }
 
     sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
           sdp->removable ? "removable " : "");
     scsi_autopm_put_device(sdp);
 
     return 0;
 
  out_free_index:
     ida_free(&sd_index_ida, index);
  out_put:
     put_disk(gd);
  out_free:
     kfree(sdkp);
  out:
     scsi_autopm_put_device(sdp);
     return error;
 }
 
 /**
  *  sd_remove - called whenever a scsi disk (previously recognized by
  *  sd_probe) is detached from the system. It is called (potentially
  *  multiple times) during sd module unload.
  *  @dev: pointer to device object
  *
  *  Note: this function is invoked from the scsi mid-level.
  *  This function potentially frees up a device name (e.g. /dev/sdc)
  *  that could be re-used by a subsequent sd_probe().
  *  This function is not called when the built-in sd driver is "exit-ed".
  **/
 static int sd_remove(struct device *dev)
 {
     struct scsi_disk *sdkp = dev_get_drvdata(dev);
 
     scsi_autopm_get_device(sdkp->device);
 
     device_del(&sdkp->disk_dev);
     del_gendisk(sdkp->disk);
     sd_shutdown(dev);
 
     put_disk(sdkp->disk);
     return 0;
 }
 
 static void scsi_disk_release(struct device *dev)
 {
     struct scsi_disk *sdkp = to_scsi_disk(dev);
 
     ida_free(&sd_index_ida, sdkp->index);
     sd_zbc_free_zone_info(sdkp);
     put_device(&sdkp->device->sdev_gendev);
     free_opal_dev(sdkp->opal_dev);
 
     kfree(sdkp);
 }
 
 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
 {
     unsigned char cmd[6] = { START_STOP };  /* START_VALID */
     struct scsi_sense_hdr sshdr;
     struct scsi_device *sdp = sdkp->device;
     int res;
 
     if (start)
         cmd[4] |= 1;    /* START */
 
     if (sdp->start_stop_pwr_cond)
         cmd[4] |= start ? 1 << 4 : 3 << 4;  /* Active or Standby */
 
     if (!scsi_device_online(sdp))
         return -ENODEV;
 
     res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
             SD_TIMEOUT, sdkp->max_retries, 0, RQF_PM, NULL);
     if (res) {
         sd_print_result(sdkp, "Start/Stop Unit failed", res);
         if (res > 0 && scsi_sense_valid(&sshdr)) {
             sd_print_sense_hdr(sdkp, &sshdr);
             /* 0x3a is medium not present */
             if (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) {
         if (!sdkp->device->silence_suspend)
             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) {
         if (!sdkp->device->silence_suspend)
             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)
 {
     if (pm_runtime_suspended(dev))
         return 0;
 
     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;
 }
 
 static int sd_resume_system(struct device *dev)
 {
     if (pm_runtime_suspended(dev))
         return 0;
 
     return sd_resume(dev);
 }
 
 static int sd_resume_runtime(struct device *dev)
 {
     struct scsi_disk *sdkp = dev_get_drvdata(dev);
     struct scsi_device *sdp;
 
     if (!sdkp)  /* E.g.: runtime resume at the start of sd_probe() */
         return 0;
 
     sdp = sdkp->device;
 
     if (sdp->ignore_media_change) {
         /* clear the device's sense data */
         static const u8 cmd[10] = { REQUEST_SENSE };
 
         if (scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL,
                  NULL, sdp->request_queue->rq_timeout, 1, 0,
                  RQF_PM, NULL))
             sd_printk(KERN_NOTICE, sdkp,
                   "Failed to clear sense data\n");
     }
 
     return sd_resume(dev);
 }
 
 /**
  *  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", sd_default_probe))
             continue;
         majors++;
     }
 
     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_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
     if (!sd_page_pool) {
         printk(KERN_ERR "sd: can't init discard page pool\n");
         err = -ENOMEM;
         goto err_out_cache;
     }
 
     err = scsi_register_driver(&sd_template.gendrv);
     if (err)
         goto err_out_driver;
 
     return 0;
 
 err_out_driver:
     mempool_destroy(sd_page_pool);
 
 err_out_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_page_pool);
     kmem_cache_destroy(sd_cdb_cache);
 
     class_unregister(&sd_disk_class);
 
     for (i = 0; i < SD_MAJORS; i++)
         unregister_blkdev(sd_major(i), "sd");
 }
 
 module_init(init_sd);
 module_exit(exit_sd);
 
 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
 {
     scsi_print_sense_hdr(sdkp->device,
                  sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
 }
 
 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
 {
     const char *hb_string = scsi_hostbyte_string(result);
 
     if (hb_string)
         sd_printk(KERN_INFO, sdkp,
               "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
               hb_string ? hb_string : "invalid",
               "DRIVER_OK");
     else
         sd_printk(KERN_INFO, sdkp,
               "%s: Result: hostbyte=0x%02x driverbyte=%s\n",
               msg, host_byte(result), "DRIVER_OK");
 }