484 lines
12 KiB
C
484 lines
12 KiB
C
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_devinfo.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include "usb.h"
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#include "scsiglue.h"
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#include "transport.h"
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/* Host functions */
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/*
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* host_info()
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*/
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static const char *host_info(struct Scsi_Host *host)
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{
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/* pr_info("scsiglue --- host_info\n"); */
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return "SCSI emulation for USB Mass Storage devices";
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}
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/*
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* slave_alloc()
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*/
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static int slave_alloc(struct scsi_device *sdev)
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{
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struct us_data *us = host_to_us(sdev->host);
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/* pr_info("scsiglue --- slave_alloc\n"); */
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sdev->inquiry_len = 36;
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blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
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if (us->subclass == USB_SC_UFI)
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sdev->sdev_target->pdt_1f_for_no_lun = 1;
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return 0;
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}
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/*
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* slave_configure()
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*/
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static int slave_configure(struct scsi_device *sdev)
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{
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struct us_data *us = host_to_us(sdev->host);
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/* pr_info("scsiglue --- slave_configure\n"); */
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if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) {
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unsigned int max_sectors = 64;
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if (us->fflags & US_FL_MAX_SECTORS_MIN)
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max_sectors = PAGE_CACHE_SIZE >> 9;
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if (queue_max_sectors(sdev->request_queue) > max_sectors)
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blk_queue_max_hw_sectors(sdev->request_queue,
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max_sectors);
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}
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if (sdev->type == TYPE_DISK) {
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if (us->subclass != USB_SC_SCSI &&
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us->subclass != USB_SC_CYP_ATACB)
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sdev->use_10_for_ms = 1;
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sdev->use_192_bytes_for_3f = 1;
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if (us->fflags & US_FL_NO_WP_DETECT)
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sdev->skip_ms_page_3f = 1;
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sdev->skip_ms_page_8 = 1;
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if (us->fflags & US_FL_FIX_CAPACITY)
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sdev->fix_capacity = 1;
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if (us->fflags & US_FL_CAPACITY_HEURISTICS)
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sdev->guess_capacity = 1;
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if (sdev->scsi_level > SCSI_2)
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sdev->sdev_target->scsi_level = sdev->scsi_level = SCSI_2;
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sdev->retry_hwerror = 1;
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sdev->allow_restart = 1;
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sdev->last_sector_bug = 1;
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} else {
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sdev->use_10_for_ms = 1;
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}
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if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) &&
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sdev->scsi_level == SCSI_UNKNOWN)
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us->max_lun = 0;
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if (us->fflags & US_FL_NOT_LOCKABLE)
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sdev->lockable = 0;
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return 0;
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}
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/* This is always called with scsi_lock(host) held */
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/*
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* queuecommand()
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*/
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static int queuecommand_lck(struct scsi_cmnd *srb,
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void (*done)(struct scsi_cmnd *))
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{
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struct us_data *us = host_to_us(srb->device->host);
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/* pr_info("scsiglue --- queuecommand\n"); */
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/* check for state-transition errors */
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if (us->srb != NULL) {
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/* pr_info("Error in %s: us->srb = %p\n"
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__FUNCTION__, us->srb); */
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return SCSI_MLQUEUE_HOST_BUSY;
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}
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/* fail the command if we are disconnecting */
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if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
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pr_info("Fail command during disconnect\n");
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srb->result = DID_NO_CONNECT << 16;
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done(srb);
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return 0;
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}
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/* enqueue the command and wake up the control thread */
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srb->scsi_done = done;
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us->srb = srb;
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complete(&us->cmnd_ready);
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return 0;
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}
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static DEF_SCSI_QCMD(queuecommand)
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/***********************************************************************
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* Error handling functions
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***********************************************************************/
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/* Command timeout and abort */
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/*
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* command_abort()
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*/
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static int command_abort(struct scsi_cmnd *srb)
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{
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struct us_data *us = host_to_us(srb->device->host);
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/* pr_info("scsiglue --- command_abort\n"); */
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scsi_lock(us_to_host(us));
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if (us->srb != srb) {
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scsi_unlock(us_to_host(us));
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printk("-- nothing to abort\n");
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return FAILED;
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}
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set_bit(US_FLIDX_TIMED_OUT, &us->dflags);
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if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) {
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set_bit(US_FLIDX_ABORTING, &us->dflags);
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usb_stor_stop_transport(us);
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}
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scsi_unlock(us_to_host(us));
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/* Wait for the aborted command to finish */
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wait_for_completion(&us->notify);
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return SUCCESS;
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}
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/* This invokes the transport reset mechanism to reset the state of the
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* device.
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*/
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/*
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* device_reset()
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*/
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static int device_reset(struct scsi_cmnd *srb)
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{
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struct us_data *us = host_to_us(srb->device->host);
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int result;
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/* pr_info("scsiglue --- device_reset\n"); */
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/* lock the device pointers and do the reset */
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mutex_lock(&(us->dev_mutex));
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result = us->transport_reset(us);
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mutex_unlock(&us->dev_mutex);
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return result < 0 ? FAILED : SUCCESS;
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}
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/*
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* bus_reset()
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*/
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static int bus_reset(struct scsi_cmnd *srb)
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{
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struct us_data *us = host_to_us(srb->device->host);
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int result;
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/* pr_info("scsiglue --- bus_reset\n"); */
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result = usb_stor_port_reset(us);
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return result < 0 ? FAILED : SUCCESS;
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}
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/*
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* usb_stor_report_device_reset()
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*/
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void usb_stor_report_device_reset(struct us_data *us)
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{
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int i;
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struct Scsi_Host *host = us_to_host(us);
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/* pr_info("scsiglue --- usb_stor_report_device_reset\n"); */
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scsi_report_device_reset(host, 0, 0);
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if (us->fflags & US_FL_SCM_MULT_TARG) {
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for (i = 1; i < host->max_id; ++i)
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scsi_report_device_reset(host, 0, i);
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}
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}
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/*
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* usb_stor_report_bus_reset()
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*/
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void usb_stor_report_bus_reset(struct us_data *us)
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{
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struct Scsi_Host *host = us_to_host(us);
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/* pr_info("scsiglue --- usb_stor_report_bus_reset\n"); */
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scsi_lock(host);
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scsi_report_bus_reset(host, 0);
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scsi_unlock(host);
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}
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/***********************************************************************
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* /proc/scsi/ functions
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***********************************************************************/
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/* we use this macro to help us write into the buffer */
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#undef SPRINTF
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#define SPRINTF(args...) \
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do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)
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/*
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* proc_info()
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*/
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static int proc_info(struct Scsi_Host *host, char *buffer, char **start,
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off_t offset, int length, int inout)
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{
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struct us_data *us = host_to_us(host);
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char *pos = buffer;
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const char *string;
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/* pr_info("scsiglue --- proc_info\n"); */
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if (inout)
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return length;
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/* print the controller name */
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SPRINTF(" Host scsi%d: usb-storage\n", host->host_no);
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/* print product, vendor, and serial number strings */
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if (us->pusb_dev->manufacturer)
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string = us->pusb_dev->manufacturer;
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else if (us->unusual_dev->vendorName)
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string = us->unusual_dev->vendorName;
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else
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string = "Unknown";
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SPRINTF(" Vendor: %s\n", string);
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if (us->pusb_dev->product)
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string = us->pusb_dev->product;
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else if (us->unusual_dev->productName)
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string = us->unusual_dev->productName;
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else
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string = "Unknown";
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SPRINTF(" Product: %s\n", string);
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if (us->pusb_dev->serial)
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string = us->pusb_dev->serial;
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else
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string = "None";
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SPRINTF("Serial Number: %s\n", string);
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/* show the protocol and transport */
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SPRINTF(" Protocol: %s\n", us->protocol_name);
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SPRINTF(" Transport: %s\n", us->transport_name);
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/* show the device flags */
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if (pos < buffer + length) {
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pos += sprintf(pos, " Quirks:");
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#define US_FLAG(name, value) \
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if (us->fflags & value)\
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pos += sprintf(pos, " " #name);
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US_DO_ALL_FLAGS
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#undef US_FLAG
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*(pos++) = '\n';
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}
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/* Calculate start of next buffer, and return value. */
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*start = buffer + offset;
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if ((pos - buffer) < offset)
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return 0;
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else if ((pos - buffer - offset) < length)
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return pos - buffer - offset;
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else
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return length;
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}
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/***********************************************************************
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* Sysfs interface
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***********************************************************************/
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/* Output routine for the sysfs max_sectors file */
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/*
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* show_max_sectors()
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*/
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static ssize_t show_max_sectors(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct scsi_device *sdev = to_scsi_device(dev);
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/* pr_info("scsiglue --- ssize_t show_max_sectors\n"); */
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return sprintf(buf, "%u\n", queue_max_sectors(sdev->request_queue));
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}
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/* Input routine for the sysfs max_sectors file */
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/*
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* store_max_sectors()
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*/
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static ssize_t store_max_sectors(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct scsi_device *sdev = to_scsi_device(dev);
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unsigned short ms;
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/* pr_info("scsiglue --- ssize_t store_max_sectors\n"); */
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if (sscanf(buf, "%hu", &ms) > 0 && ms <= SCSI_DEFAULT_MAX_SECTORS) {
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blk_queue_max_hw_sectors(sdev->request_queue, ms);
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return strlen(buf);
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}
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return -EINVAL;
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}
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static DEVICE_ATTR(max_sectors, S_IRUGO | S_IWUSR, show_max_sectors, store_max_sectors);
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static struct device_attribute *sysfs_device_attr_list[] = {&dev_attr_max_sectors, NULL, };
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/* this defines our host template, with which we'll allocate hosts */
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/*
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* usb_stor_host_template()
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*/
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struct scsi_host_template usb_stor_host_template = {
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/* basic userland interface stuff */
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.name = "eucr-storage",
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.proc_name = "eucr-storage",
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.proc_info = proc_info,
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.info = host_info,
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/* command interface -- queued only */
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.queuecommand = queuecommand,
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/* error and abort handlers */
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.eh_abort_handler = command_abort,
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.eh_device_reset_handler = device_reset,
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.eh_bus_reset_handler = bus_reset,
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/* queue commands only, only one command per LUN */
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.can_queue = 1,
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.cmd_per_lun = 1,
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/* unknown initiator id */
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.this_id = -1,
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.slave_alloc = slave_alloc,
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.slave_configure = slave_configure,
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/* lots of sg segments can be handled */
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.sg_tablesize = SG_ALL,
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/* limit the total size of a transfer to 120 KB */
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.max_sectors = 240,
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/* merge commands... this seems to help performance, but
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* periodically someone should test to see which setting is more
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* optimal.
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*/
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.use_clustering = 1,
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/* emulated HBA */
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.emulated = 1,
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/* we do our own delay after a device or bus reset */
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.skip_settle_delay = 1,
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/* sysfs device attributes */
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.sdev_attrs = sysfs_device_attr_list,
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/* module management */
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.module = THIS_MODULE
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};
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/* To Report "Illegal Request: Invalid Field in CDB */
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unsigned char usb_stor_sense_invalidCDB[18] = {
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[0] = 0x70, /* current error */
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[2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */
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[7] = 0x0a, /* additional length */
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[12] = 0x24 /* Invalid Field in CDB */
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};
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/***********************************************************************
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* Scatter-gather transfer buffer access routines
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***********************************************************************/
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/*
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* usb_stor_access_xfer_buf()
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*/
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unsigned int usb_stor_access_xfer_buf(struct us_data *us, unsigned char *buffer,
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unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **sgptr,
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unsigned int *offset, enum xfer_buf_dir dir)
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{
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unsigned int cnt;
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/* pr_info("transport --- usb_stor_access_xfer_buf\n"); */
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struct scatterlist *sg = *sgptr;
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if (!sg)
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sg = scsi_sglist(srb);
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cnt = 0;
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while (cnt < buflen && sg) {
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struct page *page = sg_page(sg) +
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((sg->offset + *offset) >> PAGE_SHIFT);
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unsigned int poff = (sg->offset + *offset) & (PAGE_SIZE-1);
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unsigned int sglen = sg->length - *offset;
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if (sglen > buflen - cnt) {
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/* Transfer ends within this s-g entry */
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sglen = buflen - cnt;
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*offset += sglen;
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} else {
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/* Transfer continues to next s-g entry */
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*offset = 0;
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sg = sg_next(sg);
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}
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while (sglen > 0) {
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unsigned int plen = min(sglen,
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(unsigned int)PAGE_SIZE - poff);
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unsigned char *ptr = kmap(page);
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if (dir == TO_XFER_BUF)
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memcpy(ptr + poff, buffer + cnt, plen);
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else
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memcpy(buffer + cnt, ptr + poff, plen);
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kunmap(page);
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/* Start at the beginning of the next page */
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poff = 0;
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++page;
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cnt += plen;
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sglen -= plen;
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}
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}
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*sgptr = sg;
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/* Return the amount actually transferred */
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return cnt;
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}
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/*
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* Store the contents of buffer into srb's transfer
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* buffer and set the SCSI residue.
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*/
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/*
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* usb_stor_set_xfer_buf()
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*/
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void usb_stor_set_xfer_buf(struct us_data *us, unsigned char *buffer,
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unsigned int buflen, struct scsi_cmnd *srb, unsigned int dir)
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{
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unsigned int offset = 0;
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struct scatterlist *sg = NULL;
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/* pr_info("transport --- usb_stor_set_xfer_buf\n"); */
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/* TO_XFER_BUF = 0, FROM_XFER_BUF = 1 */
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buflen = min(buflen, scsi_bufflen(srb));
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buflen = usb_stor_access_xfer_buf(us, buffer, buflen, srb,
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&sg, &offset, dir);
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if (buflen < scsi_bufflen(srb))
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scsi_set_resid(srb, scsi_bufflen(srb) - buflen);
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}
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