2006-10-08 Thomas Schwinge <tschwinge@gnu.org>

* linux/dev/drivers/scsi/sd.c: Move file...
	* linux/src/drivers/scsi/sd.c: ... here.

1 files changed, 0 insertions, 1691 deletions

diff --git a/linux/dev/drivers/scsi/sd.c b/linux/dev/drivers/scsi/sd.c
deleted file mode 100644
index d5f1524..0000000
--- a/linux/dev/drivers/scsi/sd.c
+++ /dev/null
@@ -1,1691 +0,0 @@
-/*
- *      sd.c Copyright (C) 1992 Drew Eckhardt 
- *           Copyright (C) 1993, 1994, 1995 Eric Youngdale
- *
- *      Linux scsi disk driver
- *              Initial versions: Drew Eckhardt 
- *              Subsequent revisions: Eric Youngdale
- *
- *      <drew@colorado.edu>
- *
- *       Modified by Eric Youngdale ericy@cais.com to
- *       add scatter-gather, multiple outstanding request, and other
- *       enhancements.
- *
- *       Modified by Eric Youngdale eric@aib.com to support loadable
- *       low-level scsi drivers.
- */
-
-#include <linux/module.h>
-#ifdef MODULE
-/*
- * This is a variable in scsi.c that is set when we are processing something
- * after boot time.  By definition, this is true when we are a loadable module
- * ourselves.
- */
-#define MODULE_FLAG 1
-#else
-#define MODULE_FLAG scsi_loadable_module_flag
-#endif /* MODULE */
-
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-
-#include <asm/system.h>
-
-#define MAJOR_NR SCSI_DISK_MAJOR
-#include <linux/blk.h>
-#include "scsi.h"
-#include "hosts.h"
-#include "sd.h"
-#include <scsi/scsi_ioctl.h>
-#include "constants.h"
-
-#include <linux/genhd.h>
-
-/*
- *  static const char RCSid[] = "$Header:";
- */
-
-#define MAX_RETRIES 5
-
-/*
- *  Time out in seconds for disks and Magneto-opticals (which are slower).
- */
-
-#define SD_TIMEOUT (20 * HZ)
-#define SD_MOD_TIMEOUT (25 * HZ)
-
-#define CLUSTERABLE_DEVICE(SC) (SC->host->use_clustering && \
-				SC->device->type != TYPE_MOD)
-
-struct hd_struct * sd;
-
-Scsi_Disk * rscsi_disks = NULL;
-static int * sd_sizes;
-static int * sd_blocksizes;
-static int * sd_hardsizes;              /* Hardware sector size */
-
-extern int sd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
-
-static int check_scsidisk_media_change(kdev_t);
-static int fop_revalidate_scsidisk(kdev_t);
-
-static int sd_init_onedisk(int);
-
-static void requeue_sd_request (Scsi_Cmnd * SCpnt);
-
-static int sd_init(void);
-static void sd_finish(void);
-static int sd_attach(Scsi_Device *);
-static int sd_detect(Scsi_Device *);
-static void sd_detach(Scsi_Device *);
-
-struct Scsi_Device_Template sd_template = 
-{ NULL, "disk", "sd", NULL, TYPE_DISK, 
-      SCSI_DISK_MAJOR, 0, 0, 0, 1,
-      sd_detect, sd_init,
-      sd_finish, sd_attach, sd_detach
-};
-
-static int sd_open(struct inode * inode, struct file * filp)
-{
-    int target;
-    target =  DEVICE_NR(inode->i_rdev);
-    
-    if(target >= sd_template.dev_max || !rscsi_disks[target].device)
-	return -ENXIO;   /* No such device */
-    
-    /* 
-     * Make sure that only one process can do a check_change_disk at one time.
-     * This is also used to lock out further access when the partition table 
-     * is being re-read. 
-     */
-    
-    while (rscsi_disks[target].device->busy)
-        barrier();   
-    if(rscsi_disks[target].device->removable) {
-	check_disk_change(inode->i_rdev);
-	
-	/*
-	 * If the drive is empty, just let the open fail.
-	 */
-	if ( !rscsi_disks[target].ready )
-	    return -ENXIO;
-
-	/*
-	 * Similarly, 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.
-	 */
-	if ( (rscsi_disks[target].write_prot) && (filp->f_mode & 2) )
-	    return -EROFS;
-    }
-
-    /*
-     * See if we are requesting a non-existent partition.  Do this
-     * after checking for disk change.
-     */
-    if(sd_sizes[MINOR(inode->i_rdev)] == 0)
-	return -ENXIO;
-    
-    if(rscsi_disks[target].device->removable)
-	if(!rscsi_disks[target].device->access_count)
-	    sd_ioctl(inode, NULL, SCSI_IOCTL_DOORLOCK, 0);
-
-    rscsi_disks[target].device->access_count++;
-    if (rscsi_disks[target].device->host->hostt->usage_count)
-	(*rscsi_disks[target].device->host->hostt->usage_count)++;
-    if(sd_template.usage_count) (*sd_template.usage_count)++;
-    return 0;
-}
-
-static void sd_release(struct inode * inode, struct file * file)
-{
-    int target;
-    fsync_dev(inode->i_rdev);
-    
-    target =  DEVICE_NR(inode->i_rdev);
-    
-    rscsi_disks[target].device->access_count--;
-    if (rscsi_disks[target].device->host->hostt->usage_count)
-	(*rscsi_disks[target].device->host->hostt->usage_count)--;
-    if(sd_template.usage_count) (*sd_template.usage_count)--;
-    
-    if(rscsi_disks[target].device->removable) {
-	if(!rscsi_disks[target].device->access_count)
-	    sd_ioctl(inode, NULL, SCSI_IOCTL_DOORUNLOCK, 0);
-    }
-}
-
-static void sd_geninit(struct gendisk *);
-
-static struct file_operations sd_fops = {
-    NULL,                        /* lseek - default */
-    block_read,                  /* read - general block-dev read */
-    block_write,                 /* write - general block-dev write */
-    NULL,                        /* readdir - bad */
-    NULL,                        /* select */
-    sd_ioctl,                    /* ioctl */
-    NULL,                        /* mmap */
-    sd_open,                     /* open code */
-    sd_release,                  /* release */
-    block_fsync,                 /* fsync */
-    NULL,                        /* fasync */
-    check_scsidisk_media_change, /* Disk change */
-    fop_revalidate_scsidisk      /* revalidate */
-};
-
-static struct gendisk sd_gendisk = {
-    MAJOR_NR,                    /* Major number */
-    "sd",                        /* Major name */
-    4,                           /* Bits to shift to get real from partition */
-    1 << 4,                      /* Number of partitions per real */
-    0,                           /* maximum number of real */
-    sd_geninit,                  /* init function */
-    NULL,                        /* hd struct */
-    NULL,                        /* block sizes */
-    0,                           /* number */
-    NULL,                        /* internal */
-    NULL                         /* next */
-};
-
-static void sd_geninit (struct gendisk *ignored)
-{
-    int i;
-    
-    for (i = 0; i < sd_template.dev_max; ++i)
-	if(rscsi_disks[i].device) 
-	    sd[i << 4].nr_sects = rscsi_disks[i].capacity;
-#if 0
-    /* No longer needed - we keep track of this as we attach/detach */
-    sd_gendisk.nr_real = sd_template.dev_max;
-#endif
-}
-
-/*
- * rw_intr is the interrupt routine for the device driver.
- * It will be notified on the end of a SCSI read / write, and
- * will take one of several actions based on success or failure.
- */
-
-static void rw_intr (Scsi_Cmnd *SCpnt)
-{
-    int result = SCpnt->result;
-    int this_count = SCpnt->bufflen >> 9;
-    int good_sectors = (result == 0 ? this_count : 0);
-    int block_sectors = 1;
-    
-#ifdef DEBUG
-    printk("sd%c : rw_intr(%d, %d)\n", 'a' + MINOR(SCpnt->request.rq_dev), 
-	   SCpnt->host->host_no, result);
-#endif
-
-    /*
-      Handle MEDIUM ERRORs that indicate partial success.  Since this is a
-      relatively rare error condition, no care is taken to avoid unnecessary
-      additional work such as memcpy's that could be avoided.
-    */
-
-    if (driver_byte(result) != 0 &&		    /* An error occurred */
-	SCpnt->sense_buffer[0] == 0xF0 &&	    /* Sense data is valid */
-	SCpnt->sense_buffer[2] == MEDIUM_ERROR)
-      {
-	long error_sector = (SCpnt->sense_buffer[3] << 24) |
-			    (SCpnt->sense_buffer[4] << 16) |
-			    (SCpnt->sense_buffer[5] << 8) |
-			    SCpnt->sense_buffer[6];
-	int sector_size =
-	  rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].sector_size;
-	if (SCpnt->request.bh != NULL)
-	  block_sectors = SCpnt->request.bh->b_size >> 9;
-	if (sector_size == 1024)
-	  {
-	    error_sector <<= 1;
-	    if (block_sectors < 2) block_sectors = 2;
-	  }
-	else if (sector_size == 256)
-	  error_sector >>= 1;
-	error_sector -= sd[MINOR(SCpnt->request.rq_dev)].start_sect;
-	error_sector &= ~ (block_sectors - 1);
-	good_sectors = error_sector - SCpnt->request.sector;
-	if (good_sectors < 0 || good_sectors >= this_count)
-	  good_sectors = 0;
-      }
-    
-    /*
-     * Handle RECOVERED ERRORs that indicate success after recovery action
-     * by the target device.
-     */
-
-    if (SCpnt->sense_buffer[0] == 0xF0 &&	    /* Sense data is valid */
-	SCpnt->sense_buffer[2] == RECOVERED_ERROR)
-      {
-	printk("scsidisk recovered I/O error: dev %s, sector %lu, absolute sector %lu\n",
-	       kdevname(SCpnt->request.rq_dev), SCpnt->request.sector, 
-	       SCpnt->request.sector + sd[MINOR(SCpnt->request.rq_dev)].start_sect);
-	good_sectors = this_count;
-	result = 0;
-      }
-
-    /*
-     * First case : we assume that the command succeeded.  One of two things 
-     * will happen here.  Either we will be finished, or there will be more
-     * sectors that we were unable to read last time.
-     */
-
-    if (good_sectors > 0) {
-	
-#ifdef DEBUG
-	printk("sd%c : %d sectors remain.\n", 'a' + MINOR(SCpnt->request.rq_dev),
-	       SCpnt->request.nr_sectors);
-	printk("use_sg is %d\n ",SCpnt->use_sg);
-#endif
-	if (SCpnt->use_sg) {
-	    struct scatterlist * sgpnt;
-	    int i;
-	    sgpnt = (struct scatterlist *) SCpnt->buffer;
-	    for(i=0; i<SCpnt->use_sg; i++) {
-#ifdef DEBUG
-		printk(":%x %x %d\n",sgpnt[i].alt_address, sgpnt[i].address, 
-		       sgpnt[i].length);
-#endif
-		if (sgpnt[i].alt_address) {
-		    if (SCpnt->request.cmd == READ)
-			memcpy(sgpnt[i].alt_address, sgpnt[i].address, 
-			       sgpnt[i].length);
-		    scsi_free(sgpnt[i].address, sgpnt[i].length);
-		}
-	    }
-
-	    /* Free list of scatter-gather pointers */
-	    scsi_free(SCpnt->buffer, SCpnt->sglist_len);  
-	} else {
-	    if (SCpnt->buffer != SCpnt->request.buffer) {
-#ifdef DEBUG
-		printk("nosg: %x %x %d\n",SCpnt->request.buffer, SCpnt->buffer,
-		       SCpnt->bufflen);
-#endif  
-		if (SCpnt->request.cmd == READ)
-		    memcpy(SCpnt->request.buffer, SCpnt->buffer,
-			   SCpnt->bufflen);
-		scsi_free(SCpnt->buffer, SCpnt->bufflen);
-	    }
-	}
-	/*
-	 * If multiple sectors are requested in one buffer, then
-	 * they will have been finished off by the first command.
-	 * If not, then we have a multi-buffer command.
-	 */
-	if (SCpnt->request.nr_sectors > this_count)
-	{
-	    SCpnt->request.errors = 0;
-	    
-	    if (!SCpnt->request.bh)
-	    {
-#ifdef DEBUG
-		printk("sd%c : handling page request, no buffer\n",
-		       'a' + MINOR(SCpnt->request.rq_dev));
-#endif
-		/*
-		 * The SCpnt->request.nr_sectors field is always done in 
-		 * 512 byte sectors, even if this really isn't the case.
-		 */
-		panic("sd.c: linked page request (%lx %x)",
-		      SCpnt->request.sector, this_count);
-	    }
-	}
-	SCpnt = end_scsi_request(SCpnt, 1, good_sectors);
-	if (result == 0)
-	  {
-	    requeue_sd_request(SCpnt);
-	    return;
-	  }
-    }
-    
-    if (good_sectors == 0) {
-
-    /* Free up any indirection buffers we allocated for DMA purposes. */
-    if (SCpnt->use_sg) {
-	struct scatterlist * sgpnt;
-	int i;
-	sgpnt = (struct scatterlist *) SCpnt->buffer;
-	for(i=0; i<SCpnt->use_sg; i++) {
-#ifdef DEBUG
-	    printk("err: %x %x %d\n",SCpnt->request.buffer, SCpnt->buffer,
-		   SCpnt->bufflen);
-#endif
-	    if (sgpnt[i].alt_address) {
-		scsi_free(sgpnt[i].address, sgpnt[i].length);
-	    }
-	}
-	scsi_free(SCpnt->buffer, SCpnt->sglist_len);  /* Free list of scatter-gather pointers */
-    } else {
-#ifdef DEBUG
-	printk("nosgerr: %x %x %d\n",SCpnt->request.buffer, SCpnt->buffer,
-	       SCpnt->bufflen);
-#endif
-	if (SCpnt->buffer != SCpnt->request.buffer)
-	    scsi_free(SCpnt->buffer, SCpnt->bufflen);
-    }
-    }
-
-    /*
-     * Now, if we were good little boys and girls, Santa left us a request
-     * sense buffer.  We can extract information from this, so we
-     * can choose a block to remap, etc.
-     */
-
-    if (driver_byte(result) != 0) {
-	if (suggestion(result) == SUGGEST_REMAP) {
-#ifdef REMAP
-	    /*
-	     * Not yet implemented.  A read will fail after being remapped,
-	     * a write will call the strategy routine again.
-	     */
-	    if rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].remap
-	    {
-		result = 0;
-	    }
-	    else
-#endif
-	}
-	
-	if ((SCpnt->sense_buffer[0] & 0x7f) == 0x70) {
-	    if ((SCpnt->sense_buffer[2] & 0xf) == UNIT_ATTENTION) {
-		if(rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].device->removable) {
-		    /* detected disc change.  set a bit and quietly refuse
-		     * further access.
-		     */  
-		    rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].device->changed = 1;
-		    SCpnt = end_scsi_request(SCpnt, 0, this_count);
-		    requeue_sd_request(SCpnt);
-		    return;
-		}
-                else
-                {
-                    /*
-                     * Must have been a power glitch, or a bus reset.
-                     * Could not have been a media change, so we just retry
-                     * the request and see what happens.
-                     */
-                    requeue_sd_request(SCpnt);
-                    return;
-                }
-	    }
-	}
-	
-	
-	/* If we had an ILLEGAL REQUEST returned, then we may have
-	 * performed an unsupported command.  The only thing this should be 
-	 * would be a ten byte read where only a six byte read was supported.
-	 * Also, on a system where READ CAPACITY failed, we have read past
-	 * the end of the disk. 
-	 */
-
-	if (SCpnt->sense_buffer[2] == ILLEGAL_REQUEST) {
-	    if (rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].ten) {
-		rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].ten = 0;
-		requeue_sd_request(SCpnt);
-		result = 0;
-	    } else {
-		/* ???? */
-	    }
-	}
-
-	if (SCpnt->sense_buffer[2] == MEDIUM_ERROR) {
-	    printk("scsi%d: MEDIUM ERROR on channel %d, id %d, lun %d, CDB: ",
-		   SCpnt->host->host_no, (int) SCpnt->channel, 
-		   (int) SCpnt->target, (int) SCpnt->lun);
-	    print_command(SCpnt->cmnd);
-	    print_sense("sd", SCpnt);
-	    SCpnt = end_scsi_request(SCpnt, 0, block_sectors);
-	    requeue_sd_request(SCpnt);
-	    return;
-	 }
-    }  /* driver byte != 0 */
-    if (result) {
-	printk("SCSI disk error : host %d channel %d id %d lun %d return code = %x\n",
-	       rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].device->host->host_no,
-	       rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].device->channel,
-	   rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].device->id,
-	     rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)].device->lun, result);
-	
-	if (driver_byte(result) & DRIVER_SENSE)
-	    print_sense("sd", SCpnt);
-	SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.current_nr_sectors);
-	requeue_sd_request(SCpnt);
-	return;
-    }
-}
-
-/*
- * requeue_sd_request() is the request handler function for the sd driver.
- * Its function in life is to take block device requests, and translate
- * them to SCSI commands.
- */
-
-static void do_sd_request (void)
-{
-    Scsi_Cmnd * SCpnt = NULL;
-    Scsi_Device * SDev;
-    struct request * req = NULL;
-    unsigned long flags;
-    int flag = 0;
-    
-    save_flags(flags);
-    while (1==1){
-	cli();
-	if (CURRENT != NULL && CURRENT->rq_status == RQ_INACTIVE) {
-	    restore_flags(flags);
-	    return;
-	}
-	
-	INIT_SCSI_REQUEST;
-        SDev = rscsi_disks[DEVICE_NR(CURRENT->rq_dev)].device;
-        
-        /*
-         * I am not sure where the best place to do this is.  We need
-         * to hook in a place where we are likely to come if in user
-         * space.
-         */
-        if( SDev->was_reset )
-        {
-	    /*
-	     * We need to relock the door, but we might
-	     * be in an interrupt handler.  Only do this
-	     * from user space, since we do not want to
-	     * sleep from an interrupt.
-	     */
-	    if( SDev->removable && !intr_count )
-	    {
-                scsi_ioctl(SDev, SCSI_IOCTL_DOORLOCK, 0);
-		/* scsi_ioctl may allow CURRENT to change, so start over. */
-		SDev->was_reset = 0;
-		continue;
-	    }
-	    SDev->was_reset = 0;
-        }
-		
-	/* We have to be careful here. allocate_device will get a free pointer,
-	 * but there is no guarantee that it is queueable.  In normal usage, 
-	 * we want to call this, because other types of devices may have the 
-	 * host all tied up, and we want to make sure that we have at least 
-	 * one request pending for this type of device. We can also come 
-	 * through here while servicing an interrupt, because of the need to 
-	 * start another command. If we call allocate_device more than once, 
-	 * then the system can wedge if the command is not queueable. The 
-	 * request_queueable function is safe because it checks to make sure 
-	 * that the host is able to take another command before it returns
-	 * a pointer.  
-	 */
-
-	if (flag++ == 0)
-	    SCpnt = allocate_device(&CURRENT,
-			   rscsi_disks[DEVICE_NR(CURRENT->rq_dev)].device, 0); 
-	else SCpnt = NULL;
-	
-	/*
-	 * The following restore_flags leads to latency problems.  FIXME.
-	 * Using a "sti()" gets rid of the latency problems but causes
-	 * race conditions and crashes.
-	 */
-	restore_flags(flags);
-
-	/* This is a performance enhancement. We dig down into the request 
-	 * list and try to find a queueable request (i.e. device not busy, 
-	 * and host able to accept another command. If we find one, then we 
-	 * queue it. This can make a big difference on systems with more than 
-	 * one disk drive.  We want to have the interrupts off when monkeying 
-	 * with the request list, because otherwise the kernel might try to 
-	 * slip in a request in between somewhere. 
-	 */
-
-	if (!SCpnt && sd_template.nr_dev > 1){
-	    struct request *req1;
-	    req1 = NULL;
-	    cli();
-	    req = CURRENT;
-	    while(req){
-		SCpnt = request_queueable(req, 
-                                   rscsi_disks[DEVICE_NR(req->rq_dev)].device);
-		if(SCpnt) break;
-		req1 = req;
-		req = req->next;
-	    }
-	    if (SCpnt && req->rq_status == RQ_INACTIVE) {
-		if (req == CURRENT) 
-		    CURRENT = CURRENT->next;
-		else
-		    req1->next = req->next;
-	    }
-	    restore_flags(flags);
-	}
-	
-	if (!SCpnt) return; /* Could not find anything to do */
-	
-	/* Queue command */
-	requeue_sd_request(SCpnt);
-    }  /* While */
-}    
-
-static void requeue_sd_request (Scsi_Cmnd * SCpnt)
-{
-    int dev, devm, block, this_count;
-    unsigned char cmd[10];
-    int bounce_size, contiguous;
-    int max_sg;
-    struct buffer_head * bh, *bhp;
-    char * buff, *bounce_buffer;
-    
- repeat:
-    
-    if(!SCpnt || SCpnt->request.rq_status == RQ_INACTIVE) {
-	do_sd_request();
-	return;
-    }
-    
-    devm =  MINOR(SCpnt->request.rq_dev);
-    dev = DEVICE_NR(SCpnt->request.rq_dev);
-
-    block = SCpnt->request.sector;
-    this_count = 0;
-
-#ifdef DEBUG
-    printk("Doing sd request, dev = %d, block = %d\n", devm, block);
-#endif
-    
-    if (devm >= (sd_template.dev_max << 4) || 
-	!rscsi_disks[dev].device ||
-	block + SCpnt->request.nr_sectors > sd[devm].nr_sects)
-    {
-	SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
-	goto repeat;
-    }
-    
-    block += sd[devm].start_sect;
-    
-    if (rscsi_disks[dev].device->changed)
-    {
-	/*
-	 * quietly refuse to do anything to a changed disc until the changed 
-	 * bit has been reset
-	 */
-	/* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
-	SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
-	goto repeat;
-    }
-    
-#ifdef DEBUG
-    printk("sd%c : real dev = /dev/sd%c, block = %d\n", 
-	   'a' + devm, dev, block);
-#endif
-    
-    /*
-     * If we have a 1K hardware sectorsize, prevent access to single
-     * 512 byte sectors.  In theory we could handle this - in fact
-     * the scsi cdrom driver must be able to handle this because
-     * we typically use 1K blocksizes, and cdroms typically have
-     * 2K hardware sectorsizes.  Of course, things are simpler
-     * with the cdrom, since it is read-only.  For performance
-     * reasons, the filesystems should be able to handle this
-     * and not force the scsi disk driver to use bounce buffers
-     * for this.
-     */
-    if (rscsi_disks[dev].sector_size == 1024)
-	if((block & 1) || (SCpnt->request.nr_sectors & 1)) {
-	    printk("sd.c:Bad block number requested");
-	    SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
-	    goto repeat;
-	}
-    
-    switch (SCpnt->request.cmd)
-    {
-    case WRITE :
-	if (!rscsi_disks[dev].device->writeable)
-	{
-	    SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
-	    goto repeat;
-	}
-	cmd[0] = WRITE_6;
-	break;
-    case READ :
-	cmd[0] = READ_6;
-	break;
-    default :
-	panic ("Unknown sd command %d\n", SCpnt->request.cmd);
-    }
-    
-    SCpnt->this_count = 0;
-    
-    /* If the host adapter can deal with very large scatter-gather
-     * requests, it is a waste of time to cluster 
-     */
-    contiguous = (!CLUSTERABLE_DEVICE(SCpnt) ? 0 :1);
-    bounce_buffer = NULL;
-    bounce_size = (SCpnt->request.nr_sectors << 9);
-    
-    /* First see if we need a bounce buffer for this request. If we do, make 
-     * sure that we can allocate a buffer. Do not waste space by allocating 
-     * a bounce buffer if we are straddling the 16Mb line 
-     */ 
-    if (contiguous && SCpnt->request.bh &&
-	((long) SCpnt->request.bh->b_data) 
-	+ (SCpnt->request.nr_sectors << 9) - 1 > ISA_DMA_THRESHOLD 
-	&& SCpnt->host->unchecked_isa_dma) {
-	if(((long) SCpnt->request.bh->b_data) > ISA_DMA_THRESHOLD)
-	    bounce_buffer = (char *) scsi_malloc(bounce_size);
-	if(!bounce_buffer) contiguous = 0;
-    }
-    
-    if(contiguous && SCpnt->request.bh && SCpnt->request.bh->b_reqnext)
-	for(bh = SCpnt->request.bh, bhp = bh->b_reqnext; bhp; bh = bhp, 
-	    bhp = bhp->b_reqnext) {
-	    if(!CONTIGUOUS_BUFFERS(bh,bhp)) { 
-		if(bounce_buffer) scsi_free(bounce_buffer, bounce_size);
-		contiguous = 0;
-		break;
-	    } 
-	}
-    if (!SCpnt->request.bh || contiguous) {
-	
-	/* case of page request (i.e. raw device), or unlinked buffer */
-	this_count = SCpnt->request.nr_sectors;
-	buff = SCpnt->request.buffer;
-	SCpnt->use_sg = 0;
-	
-    } else if (SCpnt->host->sg_tablesize == 0 ||
-	       (need_isa_buffer && dma_free_sectors <= 10)) {
-	
-	/* Case of host adapter that cannot scatter-gather.  We also
-	 * come here if we are running low on DMA buffer memory.  We set
-	 * a threshold higher than that we would need for this request so
-	 * we leave room for other requests.  Even though we would not need
-	 * it all, we need to be conservative, because if we run low enough
-	 * we have no choice but to panic. 
-	 */
-	if (SCpnt->host->sg_tablesize != 0 &&
-	    need_isa_buffer && 
-	    dma_free_sectors <= 10)
-	    printk("Warning: SCSI DMA buffer space running low.  Using non scatter-gather I/O.\n");
-	
-	this_count = SCpnt->request.current_nr_sectors;
-	buff = SCpnt->request.buffer;
-	SCpnt->use_sg = 0;
-	
-    } else {
-	
-	/* Scatter-gather capable host adapter */
-	struct scatterlist * sgpnt;
-	int count, this_count_max;
-	int counted;
-	
-	bh = SCpnt->request.bh;
-	this_count = 0;
-	this_count_max = (rscsi_disks[dev].ten ? 0xffff : 0xff);
-	count = 0;
-	bhp = NULL;
-	while(bh) {
-	    if ((this_count + (bh->b_size >> 9)) > this_count_max) break;
-	    if(!bhp || !CONTIGUOUS_BUFFERS(bhp,bh) ||
-	       !CLUSTERABLE_DEVICE(SCpnt) ||
-	       (SCpnt->host->unchecked_isa_dma &&
-		((unsigned long) bh->b_data-1) == ISA_DMA_THRESHOLD)) {
-		if (count < SCpnt->host->sg_tablesize) count++;
-		else break;
-	    }
-	    this_count += (bh->b_size >> 9);
-	    bhp = bh;
-	    bh = bh->b_reqnext;
-	}
-#if 0
-	if(SCpnt->host->unchecked_isa_dma &&
-	   ((unsigned int) SCpnt->request.bh->b_data-1) == ISA_DMA_THRESHOLD) count--;
-#endif
-	SCpnt->use_sg = count;  /* Number of chains */
-	/* scsi_malloc can only allocate in chunks of 512 bytes */
-	count  = (SCpnt->use_sg * sizeof(struct scatterlist) + 511) & ~511;
-
-	SCpnt->sglist_len = count;
-	max_sg = count / sizeof(struct scatterlist);
-	if(SCpnt->host->sg_tablesize < max_sg) 
-	    max_sg = SCpnt->host->sg_tablesize;
-	sgpnt = (struct scatterlist * ) scsi_malloc(count);
-	if (!sgpnt) {
-	    printk("Warning - running *really* short on DMA buffers\n");
-	    SCpnt->use_sg = 0;    /* No memory left - bail out */
-	    this_count = SCpnt->request.current_nr_sectors;
-	    buff = SCpnt->request.buffer;
-	} else {
-	    memset(sgpnt, 0, count);  /* Zero so it is easy to fill, but only
-				       * if memory is available 
-				       */
-	    buff = (char *) sgpnt;
-	    counted = 0;
-	    for(count = 0, bh = SCpnt->request.bh, bhp = bh->b_reqnext;
-		count < SCpnt->use_sg && bh; 
-		count++, bh = bhp) {
-		
-		bhp = bh->b_reqnext;
-		
-		if(!sgpnt[count].address) sgpnt[count].address = bh->b_data;
-		sgpnt[count].length += bh->b_size;
-		counted += bh->b_size >> 9;
-		
-		if (((long) sgpnt[count].address) + sgpnt[count].length - 1 > 
-		    ISA_DMA_THRESHOLD && (SCpnt->host->unchecked_isa_dma) &&
-		    !sgpnt[count].alt_address) {
-		    sgpnt[count].alt_address = sgpnt[count].address;
-		    /* We try to avoid exhausting the DMA pool, since it is 
-		     * easier to control usage here. In other places we might 
-		     * have a more pressing need, and we would be screwed if 
-		     * we ran out */
-		    if(dma_free_sectors < (sgpnt[count].length >> 9) + 10) {
-			sgpnt[count].address = NULL;
-		    } else {
-			sgpnt[count].address = 
-			    (char *) scsi_malloc(sgpnt[count].length);
-		    }
-		    /* If we start running low on DMA buffers, we abort the 
-		     * scatter-gather operation, and free all of the memory 
-		     * we have allocated.  We want to ensure that all scsi 
-		     * operations are able to do at least a non-scatter/gather
-		     * operation */
-		    if(sgpnt[count].address == NULL){ /* Out of dma memory */
-#if 0
-			printk("Warning: Running low on SCSI DMA buffers");
-			/* Try switching back to a non s-g operation. */
-			while(--count >= 0){
-			    if(sgpnt[count].alt_address) 
-				scsi_free(sgpnt[count].address, 
-					  sgpnt[count].length);
-			}
-			this_count = SCpnt->request.current_nr_sectors;
-			buff = SCpnt->request.buffer;
-			SCpnt->use_sg = 0;
-			scsi_free(sgpnt, SCpnt->sglist_len);
-#endif
-			SCpnt->use_sg = count;
-			this_count = counted -= bh->b_size >> 9;
-			break;
-		    }		    
-		}
-		
-		/* Only cluster buffers if we know that we can supply DMA 
-		 * buffers large enough to satisfy the request. Do not cluster
-		 * a new request if this would mean that we suddenly need to 
-		 * start using DMA bounce buffers */
-		if(bhp && CONTIGUOUS_BUFFERS(bh,bhp) 
-		   && CLUSTERABLE_DEVICE(SCpnt)) {
-		    char * tmp;
-		    
-		    if (((long) sgpnt[count].address) + sgpnt[count].length +
-			bhp->b_size - 1 > ISA_DMA_THRESHOLD && 
-			(SCpnt->host->unchecked_isa_dma) &&
-			!sgpnt[count].alt_address) continue;
-		    
-		    if(!sgpnt[count].alt_address) {count--; continue; }
-		    if(dma_free_sectors > 10)
-			tmp = (char *) scsi_malloc(sgpnt[count].length 
-						   + bhp->b_size);
-		    else {
-			tmp = NULL;
-			max_sg = SCpnt->use_sg;
-		    }
-		    if(tmp){
-			scsi_free(sgpnt[count].address, sgpnt[count].length);
-			sgpnt[count].address = tmp;
-			count--;
-			continue;
-		    }
-		    
-		    /* If we are allowed another sg chain, then increment 
-		     * counter so we can insert it.  Otherwise we will end 
-		     up truncating */
-		    
-		    if (SCpnt->use_sg < max_sg) SCpnt->use_sg++;
-		}  /* contiguous buffers */
-	    } /* for loop */
-	    
-	    /* This is actually how many we are going to transfer */
-	    this_count = counted; 
-	    
-	    if(count < SCpnt->use_sg || SCpnt->use_sg 
-	       > SCpnt->host->sg_tablesize){
-		bh = SCpnt->request.bh;
-		printk("Use sg, count %d %x %d\n", 
-		       SCpnt->use_sg, count, dma_free_sectors);
-		printk("maxsg = %x, counted = %d this_count = %d\n", 
-		       max_sg, counted, this_count);
-		while(bh){
-		    printk("[%p %lx] ", bh->b_data, bh->b_size);
-		    bh = bh->b_reqnext;
-		}
-		if(SCpnt->use_sg < 16)
-		    for(count=0; count<SCpnt->use_sg; count++)
-			printk("{%d:%p %p %d}  ", count,
-			       sgpnt[count].address,
-			       sgpnt[count].alt_address,
-			       sgpnt[count].length);
-		panic("Ooops");
-	    }
-	    
-	    if (SCpnt->request.cmd == WRITE)
-		for(count=0; count<SCpnt->use_sg; count++)
-		    if(sgpnt[count].alt_address)
-			memcpy(sgpnt[count].address, sgpnt[count].alt_address, 
-			       sgpnt[count].length);
-	}  /* Able to malloc sgpnt */
-    }  /* Host adapter capable of scatter-gather */
-    
-    /* Now handle the possibility of DMA to addresses > 16Mb */
-    
-    if(SCpnt->use_sg == 0){
-	if (((long) buff) + (this_count << 9) - 1 > ISA_DMA_THRESHOLD && 
-	    (SCpnt->host->unchecked_isa_dma)) {
-	    if(bounce_buffer)
-		buff = bounce_buffer;
-	    else
-		buff = (char *) scsi_malloc(this_count << 9);
-	    if(buff == NULL) {  /* Try backing off a bit if we are low on mem*/
-		this_count = SCpnt->request.current_nr_sectors;
-		buff = (char *) scsi_malloc(this_count << 9);
-		if(!buff) panic("Ran out of DMA buffers.");
-	    }
-	    if (SCpnt->request.cmd == WRITE)
-		memcpy(buff, (char *)SCpnt->request.buffer, this_count << 9);
-	}
-    }
-#ifdef DEBUG
-    printk("sd%c : %s %d/%d 512 byte blocks.\n", 
-	   'a' + devm,
-	   (SCpnt->request.cmd == WRITE) ? "writing" : "reading",
-	   this_count, SCpnt->request.nr_sectors);
-#endif
-    
-    cmd[1] = (SCpnt->lun << 5) & 0xe0;
-    
-    if (rscsi_disks[dev].sector_size == 1024){
-	if(block & 1) panic("sd.c:Bad block number requested");
-	if(this_count & 1) panic("sd.c:Bad block number requested");
-	block = block >> 1;
-	this_count = this_count >> 1;
-    }
-    
-    if (rscsi_disks[dev].sector_size == 256){
-	block = block << 1;
-	this_count = this_count << 1;
-    }
-    
-    if (((this_count > 0xff) ||  (block > 0x1fffff)) && rscsi_disks[dev].ten)
-    {
-	if (this_count > 0xffff)
-	    this_count = 0xffff;
-	
-	cmd[0] += READ_10 - READ_6 ;
-	cmd[2] = (unsigned char) (block >> 24) & 0xff;
-	cmd[3] = (unsigned char) (block >> 16) & 0xff;
-	cmd[4] = (unsigned char) (block >> 8) & 0xff;
-	cmd[5] = (unsigned char) block & 0xff;
-	cmd[6] = cmd[9] = 0;
-	cmd[7] = (unsigned char) (this_count >> 8) & 0xff;
-	cmd[8] = (unsigned char) this_count & 0xff;
-    }
-    else
-    {
-	if (this_count > 0xff)
-	    this_count = 0xff;
-	
-	cmd[1] |= (unsigned char) ((block >> 16) & 0x1f);
-	cmd[2] = (unsigned char) ((block >> 8) & 0xff);
-	cmd[3] = (unsigned char) block & 0xff;
-	cmd[4] = (unsigned char) this_count;
-	cmd[5] = 0;
-    }
-    
-    /*
-     * We shouldn't disconnect in the middle of a sector, so with a dumb 
-     * host adapter, it's safe to assume that we can at least transfer 
-     * this many bytes between each connect / disconnect.  
-     */
-    
-    SCpnt->transfersize = rscsi_disks[dev].sector_size;
-    SCpnt->underflow = this_count << 9; 
-    scsi_do_cmd (SCpnt, (void *) cmd, buff, 
-		 this_count * rscsi_disks[dev].sector_size,
-		 rw_intr, 
-		 (SCpnt->device->type == TYPE_DISK ? 
-		  SD_TIMEOUT : SD_MOD_TIMEOUT),
-		 MAX_RETRIES);
-}
-
-static int check_scsidisk_media_change(kdev_t full_dev){
-    int retval;
-    int target;
-    struct inode inode;
-    int flag = 0;
-    
-    target =  DEVICE_NR(full_dev);
-    
-    if (target >= sd_template.dev_max ||
-	!rscsi_disks[target].device) {
-	printk("SCSI disk request error: invalid device.\n");
-	return 0;
-    }
-    
-    if(!rscsi_disks[target].device->removable) return 0;
-    
-    inode.i_rdev = full_dev;  /* This is all we really need here */
-
-    /* Using Start/Stop enables differentiation between drive with
-     * no cartridge loaded - NOT READY, drive with changed cartridge -
-     * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
-     * This also handles drives that auto spin down. eg iomega jaz 1GB
-     * as this will spin up the drive.
-     */
-    retval = sd_ioctl(&inode, NULL, SCSI_IOCTL_START_UNIT, 0);
-    
-    if(retval){ /* Unable to test, unit probably not ready.  This usually
-		 * means there is no disc in the drive.  Mark as changed,
-		 * and we will figure it out later once the drive is
-		 * available again.  */
-	
-	rscsi_disks[target].ready = 0;
-	rscsi_disks[target].device->changed = 1;
-	return 1; /* This will force a flush, if called from
-		   * check_disk_change */
-    }
-    
-    /* 
-     * for removable scsi disk ( FLOPTICAL ) we have to recognise the
-     * presence of disk in the drive. This is kept in the Scsi_Disk
-     * struct and tested at open !  Daniel Roche ( dan@lectra.fr ) 
-     */
-    
-    rscsi_disks[target].ready = 1;	/* FLOPTICAL */
-
-    retval = rscsi_disks[target].device->changed;
-    if(!flag) rscsi_disks[target].device->changed = 0;
-    return retval;
-}
-
-static void sd_init_done (Scsi_Cmnd * SCpnt)
-{
-    struct request * req;
-    
-    req = &SCpnt->request;
-    req->rq_status = RQ_SCSI_DONE; /* Busy, but indicate request done */
-    
-    if (req->sem != NULL) {
-	up(req->sem);
-    }
-}
-
-static int sd_init_onedisk(int i)
-{
-    unsigned char cmd[10];
-    unsigned char *buffer;
-    unsigned long spintime;
-    int the_result, retries;
-    Scsi_Cmnd * SCpnt;
-    
-    /* We need to retry the READ_CAPACITY because a UNIT_ATTENTION is 
-     * considered a fatal error, and many devices report such an error 
-     * just after a scsi bus reset. 
-     */
-    
-    SCpnt = allocate_device(NULL, rscsi_disks[i].device, 1);
-    buffer = (unsigned char *) scsi_malloc(512);
-    
-    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;
-	    while(retries < 3)
-	    {
-		cmd[0] = TEST_UNIT_READY;
-		cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
-		memset ((void *) &cmd[2], 0, 8);
-		SCpnt->cmd_len = 0;
-		SCpnt->sense_buffer[0] = 0;
-		SCpnt->sense_buffer[2] = 0;
-
-		{
-		    struct semaphore sem = MUTEX_LOCKED;
-		    /* Mark as really busy again */
-		    SCpnt->request.rq_status = RQ_SCSI_BUSY;
-		    SCpnt->request.sem = &sem;
-		    scsi_do_cmd (SCpnt,
-				 (void *) cmd, (void *) buffer,
-				 512, sd_init_done,  SD_TIMEOUT,
-				 MAX_RETRIES);
-		    down(&sem);
-		}
-
-		the_result = SCpnt->result;
-		retries++;
-		if(   the_result == 0
-		   || SCpnt->sense_buffer[2] != UNIT_ATTENTION)
-		    break;
-	    }
-	    
-	    /* Look for non-removable devices that return NOT_READY.  
-	     * Issue command to spin up drive for these cases. */
-	    if(the_result && !rscsi_disks[i].device->removable && 
-	       SCpnt->sense_buffer[2] == NOT_READY) {
-		unsigned long time1;
-		if(!spintime){
-#ifdef MACH
-                    printk( "sd%d: Spinning up disk...", i);
-#else
-		    printk( "sd%c: Spinning up disk...", 'a' + i );
-#endif
-		    cmd[0] = START_STOP;
-		    cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
-		    cmd[1] |= 1;  /* Return immediately */
-		    memset ((void *) &cmd[2], 0, 8);
-		    cmd[4] = 1; /* Start spin cycle */
-		    SCpnt->cmd_len = 0;
-		    SCpnt->sense_buffer[0] = 0;
-		    SCpnt->sense_buffer[2] = 0;
-		    
-		    {
-		    	struct semaphore sem = MUTEX_LOCKED;
-			/* Mark as really busy again */
-			SCpnt->request.rq_status = RQ_SCSI_BUSY; 
-		    	SCpnt->request.sem = &sem;
-			scsi_do_cmd (SCpnt,
-				     (void *) cmd, (void *) buffer,
-				     512, sd_init_done,  SD_TIMEOUT,
-				     MAX_RETRIES);
-			down(&sem);
-		    }
-		    
-		    spintime = jiffies;
-		}
-		
-		time1 = jiffies + HZ;
-		while(jiffies < time1); /* Wait 1 second for next try */
-		printk( "." );
-	    }
-	} while(the_result && spintime && spintime+100*HZ > jiffies);
-	if (spintime) {
-	    if (the_result)
-		printk( "not responding...\n" );
-	    else
-		printk( "ready\n" );
-	}
-    
-    retries = 3;
-    do {
-	cmd[0] = READ_CAPACITY;
-	cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
-	memset ((void *) &cmd[2], 0, 8);
-	memset ((void *) buffer, 0, 8);
-	SCpnt->cmd_len = 0;
-	SCpnt->sense_buffer[0] = 0;
-	SCpnt->sense_buffer[2] = 0;
-
-	{
-	    struct semaphore sem = MUTEX_LOCKED;
-	    /* Mark as really busy again */
-	    SCpnt->request.rq_status = RQ_SCSI_BUSY;
-	    SCpnt->request.sem = &sem;
-	    scsi_do_cmd (SCpnt,
-			 (void *) cmd, (void *) buffer,
-			 8, sd_init_done,  SD_TIMEOUT,
-			 MAX_RETRIES);
-	    down(&sem);	/* sleep until it is ready */
-	}
-	
-	the_result = SCpnt->result;
-	retries--;
-	
-    } while(the_result && retries);
-    
-    SCpnt->request.rq_status = RQ_INACTIVE;  /* Mark as not busy */
-    
-    wake_up(&SCpnt->device->device_wait); 
-    
-    /* Wake up a process waiting for device */
-    
-    /*
-     * The SCSI standard says: 
-     * "READ CAPACITY is necessary for self configuring software"
-     *  While not mandatory, support of READ CAPACITY is strongly encouraged.
-     *  We used to die if we couldn't successfully do a READ CAPACITY.
-     *  But, now we go on about our way.  The side effects of this are
-     *
-     *  1. We can't know block size with certainty. I have said "512 bytes 
-     *     is it" as this is most common.
-     *
-     *  2. Recovery from when some one attempts to read past the end of the 
-     *     raw device will be slower.
-     */
-    
-    if (the_result)
-    {
-#ifdef MACH
-	printk ("sd%d : READ CAPACITY failed.\n"
-		"sd%d : status = %x, message = %02x, host = %d, driver = %02x \n",
-                i, i,
-#else
-	printk ("sd%c : READ CAPACITY failed.\n"
-		"sd%c : status = %x, message = %02x, host = %d, driver = %02x \n",
-		'a' + i, 'a' + i,
-#endif
-		status_byte(the_result),
-		msg_byte(the_result),
-		host_byte(the_result),
-		driver_byte(the_result)
-		);
-	if (driver_byte(the_result)  & DRIVER_SENSE)
-#ifdef MACH
-	    printk("sd%d : extended sense code = %1x \n", 
-		   i, SCpnt->sense_buffer[2] & 0xf);
-#else
-	    printk("sd%c : extended sense code = %1x \n", 
-		   'a' + i, SCpnt->sense_buffer[2] & 0xf);
-#endif
-	else
-#ifdef MACH
-	    printk("sd%d : sense not available. \n", i);
-#else
-	    printk("sd%c : sense not available. \n", 'a' + i);
-#endif
-
-#ifdef MACH
-	printk("sd%d : block size assumed to be 512 bytes, disk size 1GB.  \n",
-	       i);
-#else
-	printk("sd%c : block size assumed to be 512 bytes, disk size 1GB.  \n",
-	       'a' + i);
-#endif
-	rscsi_disks[i].capacity = 0x1fffff;
-	rscsi_disks[i].sector_size = 512;
-	
-	/* Set dirty bit for removable devices if not ready - sometimes drives
-	 * will not report this properly. */
-	if(rscsi_disks[i].device->removable && 
-	   SCpnt->sense_buffer[2] == NOT_READY)
-	    rscsi_disks[i].device->changed = 1;
-	
-    }
-    else
-    {
-	/*
-	 * FLOPTICAL , if read_capa is ok , drive is assumed to be ready 
-	 */
-	rscsi_disks[i].ready = 1;
-
-	rscsi_disks[i].capacity = 1 + ((buffer[0] << 24) |
-				       (buffer[1] << 16) |
-				       (buffer[2] << 8) |
-				       buffer[3]);
-	
-	rscsi_disks[i].sector_size = (buffer[4] << 24) |
-	    (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
-
-	if (rscsi_disks[i].sector_size == 0) {
-	  rscsi_disks[i].sector_size = 512;
-#ifdef MACH
-	  printk("sd%d : sector size 0 reported, assuming 512.\n", i);
-#else
-	  printk("sd%c : sector size 0 reported, assuming 512.\n", 'a' + i);
-#endif
-	}
- 
-	
-	if (rscsi_disks[i].sector_size != 512 &&
-	    rscsi_disks[i].sector_size != 1024 &&
-	    rscsi_disks[i].sector_size != 256)
-	{
-#ifdef MACH
-	    printk ("sd%d : unsupported sector size %d.\n",
-		    i, rscsi_disks[i].sector_size);
-#else
-	    printk ("sd%c : unsupported sector size %d.\n",
-		    'a' + i, rscsi_disks[i].sector_size);
-#endif
-	    if(rscsi_disks[i].device->removable){
-		rscsi_disks[i].capacity = 0;
-	    } else {
-		printk ("scsi : deleting disk entry.\n");
-		rscsi_disks[i].device = NULL;
-		sd_template.nr_dev--;
-		sd_gendisk.nr_real--;
-		return i;
-	    }
-	}
-    {
-	/*
-	 * The msdos fs needs to know the hardware sector size
-	 * So I have created this table. See ll_rw_blk.c
-	 * Jacques Gelinas (Jacques@solucorp.qc.ca)
-	 */
-	int m, mb;
-        int sz_quot, sz_rem;
-	int hard_sector = rscsi_disks[i].sector_size;
-	/* There are 16 minors allocated for each major device */
-	for (m=i<<4; m<((i+1)<<4); m++){
-	    sd_hardsizes[m] = hard_sector;
-	}
-        mb = rscsi_disks[i].capacity / 1024 * hard_sector / 1024;
-        /* sz = div(m/100, 10);  this seems to not be in the libr */
-        m = (mb + 50) / 100;
-        sz_quot = m / 10;
-        sz_rem = m - (10 * sz_quot);
-#ifdef MACH
-	printk ("SCSI device sd%d: hdwr sector= %d bytes."
-               " Sectors= %d [%d MB] [%d.%1d GB]\n",
-		i, hard_sector, rscsi_disks[i].capacity, 
-                mb, sz_quot, sz_rem);
-#else
-	printk ("SCSI device sd%c: hdwr sector= %d bytes."
-               " Sectors= %d [%d MB] [%d.%1d GB]\n",
-		i+'a', hard_sector, rscsi_disks[i].capacity, 
-                mb, sz_quot, sz_rem);
-#endif
-    }
-	if(rscsi_disks[i].sector_size == 1024)
-	    rscsi_disks[i].capacity <<= 1;  /* Change into 512 byte sectors */
-	if(rscsi_disks[i].sector_size == 256)
-	    rscsi_disks[i].capacity >>= 1;  /* Change into 512 byte sectors */
-    }
-    
-
-    /*
-     * Unless otherwise specified, this is not write protected.
-     */
-    rscsi_disks[i].write_prot = 0;
-    if ( rscsi_disks[i].device->removable && rscsi_disks[i].ready ) {
-	/* FLOPTICAL */
-
-	/* 
-	 *	for removable scsi disk ( FLOPTICAL ) we have to recognise  
-	 * the Write Protect Flag. This flag is kept in the Scsi_Disk struct
-	 * and tested at open !
-	 * Daniel Roche ( dan@lectra.fr )
-	 */
-	
-	memset ((void *) &cmd[0], 0, 8);
-	cmd[0] = MODE_SENSE;
-	cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
-	cmd[2] = 1;	 /* page code 1 ?? */
-	cmd[4] = 12;
-	SCpnt->cmd_len = 0;
-	SCpnt->sense_buffer[0] = 0;
-	SCpnt->sense_buffer[2] = 0;
-
-	/* same code as READCAPA !! */
-	{
-	    struct semaphore sem = MUTEX_LOCKED;
-	    SCpnt->request.rq_status = RQ_SCSI_BUSY;  /* Mark as really busy again */
-	    SCpnt->request.sem = &sem;
-	    scsi_do_cmd (SCpnt,
-			 (void *) cmd, (void *) buffer,
-			 512, sd_init_done,  SD_TIMEOUT,
-			 MAX_RETRIES);
-	    down(&sem);
-	}
-	
-	the_result = SCpnt->result;
-	SCpnt->request.rq_status = RQ_INACTIVE;  /* Mark as not busy */
-	wake_up(&SCpnt->device->device_wait); 
-	
-	if ( the_result ) {
-#ifdef MACH
-	    printk ("sd%d: test WP failed, assume Write Protected\n",i);
-#else
-	    printk ("sd%c: test WP failed, assume Write Protected\n",i+'a');
-#endif
-	    rscsi_disks[i].write_prot = 1;
-	} else {
-	    rscsi_disks[i].write_prot = ((buffer[2] & 0x80) != 0);
-#ifdef MACH
-	    printk ("sd%d: Write Protect is %s\n",i,
-	            rscsi_disks[i].write_prot ? "on" : "off");
-#else
-	    printk ("sd%c: Write Protect is %s\n",i+'a',
-	            rscsi_disks[i].write_prot ? "on" : "off");
-#endif
-	}
-	
-    }	/* check for write protect */
- 
-    rscsi_disks[i].ten = 1;
-    rscsi_disks[i].remap = 1;
-    scsi_free(buffer, 512);
-    return i;
-}
-
-/*
- * The sd_init() function looks at all SCSI drives present, determines
- * their size, and reads partition table entries for them.
- */
-
-static int sd_registered = 0;
-
-static int sd_init()
-{
-    int i;
-    
-    if (sd_template.dev_noticed == 0) return 0;
-    
-    if(!sd_registered) {
-	  if (register_blkdev(MAJOR_NR,"sd",&sd_fops)) {
-	      printk("Unable to get major %d for SCSI disk\n",MAJOR_NR);
-	      return 1;
-	  }
-	  sd_registered++;
-      }
-    
-    /* We do not support attaching loadable devices yet. */
-    if(rscsi_disks) return 0;
-    
-    sd_template.dev_max = sd_template.dev_noticed + SD_EXTRA_DEVS;
-    
-    rscsi_disks = (Scsi_Disk *) 
-	scsi_init_malloc(sd_template.dev_max * sizeof(Scsi_Disk), GFP_ATOMIC);
-    memset(rscsi_disks, 0, sd_template.dev_max * sizeof(Scsi_Disk));
-    
-    sd_sizes = (int *) scsi_init_malloc((sd_template.dev_max << 4) * 
-					sizeof(int), GFP_ATOMIC);
-    memset(sd_sizes, 0, (sd_template.dev_max << 4) * sizeof(int));
-    
-    sd_blocksizes = (int *) scsi_init_malloc((sd_template.dev_max << 4) * 
-					     sizeof(int), GFP_ATOMIC);
-    
-    sd_hardsizes = (int *) scsi_init_malloc((sd_template.dev_max << 4) * 
-					    sizeof(int), GFP_ATOMIC);
-    
-    for(i=0;i<(sd_template.dev_max << 4);i++){
-	sd_blocksizes[i] = 1024;
-	sd_hardsizes[i] = 512;
-    }
-    blksize_size[MAJOR_NR] = sd_blocksizes;
-    hardsect_size[MAJOR_NR] = sd_hardsizes;
-    sd = (struct hd_struct *) scsi_init_malloc((sd_template.dev_max << 4) *
-					       sizeof(struct hd_struct),
-					       GFP_ATOMIC);
-    
-    
-    sd_gendisk.max_nr = sd_template.dev_max;
-    sd_gendisk.part = sd;
-    sd_gendisk.sizes = sd_sizes;
-    sd_gendisk.real_devices = (void *) rscsi_disks;
-    return 0;
-}
-
-static void sd_finish(void)
-{
-    struct gendisk *gendisk;
-    int i;
-
-    blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
-    
-    for (gendisk = gendisk_head; gendisk != NULL; gendisk = gendisk->next)
-      if (gendisk == &sd_gendisk)
-	break;
-    if (gendisk == NULL)
-      {
-	sd_gendisk.next = gendisk_head;
-	gendisk_head = &sd_gendisk;
-      }
-    
-    for (i = 0; i < sd_template.dev_max; ++i)
-	if (!rscsi_disks[i].capacity && 
-	    rscsi_disks[i].device)
-	{
-	    if (MODULE_FLAG
-		&& !rscsi_disks[i].has_part_table) {
-		sd_sizes[i << 4] = rscsi_disks[i].capacity;
-		/* revalidate does sd_init_onedisk via MAYBE_REINIT*/
-		revalidate_scsidisk(MKDEV(MAJOR_NR, i << 4), 0);
-	    }
-	    else
-	    	i=sd_init_onedisk(i);
-	    rscsi_disks[i].has_part_table = 1;
-	}
-    
-    /* If our host adapter is capable of scatter-gather, then we increase
-     * the read-ahead to 16 blocks (32 sectors).  If not, we use
-     * a two block (4 sector) read ahead. 
-     */
-    if(rscsi_disks[0].device && rscsi_disks[0].device->host->sg_tablesize)
-	read_ahead[MAJOR_NR] = 120;  /* 120 sector read-ahead */
-    else
-	read_ahead[MAJOR_NR] = 4;  /* 4 sector read-ahead */
-
-    return;
-}
-
-static int sd_detect(Scsi_Device * SDp){
-    if(SDp->type != TYPE_DISK && SDp->type != TYPE_MOD) return 0;
-
-#ifdef MACH
-    printk("Detected scsi %sdisk sd%d at scsi%d, channel %d, id %d, lun %d\n", 
-           SDp->removable ? "removable " : "",
-	   sd_template.dev_noticed++,
-	   SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
-#else
-    printk("Detected scsi %sdisk sd%c at scsi%d, channel %d, id %d, lun %d\n", 
-           SDp->removable ? "removable " : "",
-	   'a'+ (sd_template.dev_noticed++),
-	   SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
-#endif
-    
-    return 1;
-}
-
-static int sd_attach(Scsi_Device * SDp){
-    Scsi_Disk * dpnt;
-    int i;
-    
-    if(SDp->type != TYPE_DISK && SDp->type != TYPE_MOD) return 0;
-    
-    if(sd_template.nr_dev >= sd_template.dev_max) {
-	SDp->attached--;
-	return 1;
-    }
-    
-    for(dpnt = rscsi_disks, i=0; i<sd_template.dev_max; i++, dpnt++) 
-	if(!dpnt->device) break;
-    
-    if(i >= sd_template.dev_max) panic ("scsi_devices corrupt (sd)");
-    
-    SDp->scsi_request_fn = do_sd_request;
-    rscsi_disks[i].device = SDp;
-    rscsi_disks[i].has_part_table = 0;
-    sd_template.nr_dev++;
-    sd_gendisk.nr_real++;
-    return 0;
-}
-
-#define DEVICE_BUSY rscsi_disks[target].device->busy
-#define USAGE rscsi_disks[target].device->access_count
-#define CAPACITY rscsi_disks[target].capacity
-#define MAYBE_REINIT  sd_init_onedisk(target)
-#define GENDISK_STRUCT sd_gendisk
-
-/* This routine is called to flush all partitions and partition tables
- * for a changed scsi disk, and then re-read the new partition table.
- * If we are revalidating a disk because of a media change, then we
- * enter with usage == 0.  If we are using an ioctl, we automatically have
- * usage == 1 (we need an open channel to use an ioctl :-), so this
- * is our limit.
- */
-int revalidate_scsidisk(kdev_t dev, int maxusage){
-    int target;
-    struct gendisk * gdev;
-    unsigned long flags;
-    int max_p;
-    int start;
-    int i;
-    
-    target =  DEVICE_NR(dev);
-    gdev = &GENDISK_STRUCT;
-    
-    save_flags(flags);
-    cli();
-    if (DEVICE_BUSY || USAGE > maxusage) {
-	restore_flags(flags);
-	printk("Device busy for revalidation (usage=%d)\n", USAGE);
-	return -EBUSY;
-    }
-    DEVICE_BUSY = 1;
-    restore_flags(flags);
-    
-    max_p = gdev->max_p;
-    start = target << gdev->minor_shift;
-    
-    for (i=max_p - 1; i >=0 ; i--) {
-	int minor = start+i;
-	kdev_t devi = MKDEV(MAJOR_NR, minor);
-	sync_dev(devi);
-	invalidate_inodes(devi);
-	invalidate_buffers(devi);
-	gdev->part[minor].start_sect = 0;
-	gdev->part[minor].nr_sects = 0;
-        /*
-         * Reset the blocksize for everything so that we can read
-         * the partition table.
-         */
-        blksize_size[MAJOR_NR][minor] = 1024;
-    }
-    
-#ifdef MAYBE_REINIT
-    MAYBE_REINIT;
-#endif
-    
-    gdev->part[start].nr_sects = CAPACITY;
-    resetup_one_dev(gdev, target);
-    
-    DEVICE_BUSY = 0;
-    return 0;
-}
-
-static int fop_revalidate_scsidisk(kdev_t dev){
-    return revalidate_scsidisk(dev, 0);
-}
-
-
-static void sd_detach(Scsi_Device * SDp)
-{
-    Scsi_Disk * dpnt;
-    int i;
-    int max_p;
-    int start;
-    
-    for(dpnt = rscsi_disks, i=0; i<sd_template.dev_max; i++, dpnt++) 
-	if(dpnt->device == SDp) {
-	    
-	    /* If we are disconnecting a disk driver, sync and invalidate 
-	     * everything */
-	    max_p = sd_gendisk.max_p;
-	    start = i << sd_gendisk.minor_shift;
-	    
-	    for (i=max_p - 1; i >=0 ; i--) {
-		int minor = start+i;
-		kdev_t devi = MKDEV(MAJOR_NR, minor);
-		sync_dev(devi);
-		invalidate_inodes(devi);
-		invalidate_buffers(devi);
-		sd_gendisk.part[minor].start_sect = 0;
-		sd_gendisk.part[minor].nr_sects = 0;
-		sd_sizes[minor] = 0;
-	    }
-	    
-	    dpnt->has_part_table = 0;
-	    dpnt->device = NULL;
-	    dpnt->capacity = 0;
-	    SDp->attached--;
-	    sd_template.dev_noticed--;
-	    sd_template.nr_dev--;
-	    sd_gendisk.nr_real--;
-	    return;
-	}
-    return;
-}
-
-#ifdef MODULE
-
-int init_module(void) {
-    sd_template.usage_count = &mod_use_count_;
-    return scsi_register_module(MODULE_SCSI_DEV, &sd_template);
-}
-
-void cleanup_module( void) 
-{
-    struct gendisk * prev_sdgd;
-    struct gendisk * sdgd;
-    
-    scsi_unregister_module(MODULE_SCSI_DEV, &sd_template);
-    unregister_blkdev(SCSI_DISK_MAJOR, "sd");
-    sd_registered--;
-    if( rscsi_disks != NULL )
-    {
-	scsi_init_free((char *) rscsi_disks,
-		       (sd_template.dev_noticed + SD_EXTRA_DEVS) 
-		       * sizeof(Scsi_Disk));
-	
-	scsi_init_free((char *) sd_sizes, sd_template.dev_max * sizeof(int));
-	scsi_init_free((char *) sd_blocksizes, sd_template.dev_max * sizeof(int));
-	scsi_init_free((char *) sd_hardsizes, sd_template.dev_max * sizeof(int));
-	scsi_init_free((char *) sd, 
-		       (sd_template.dev_max << 4) * sizeof(struct hd_struct));
-	/*
-	 * Now remove sd_gendisk from the linked list
-	 */
-	sdgd = gendisk_head;
-	prev_sdgd = NULL;
-	while(sdgd != &sd_gendisk)
-	{
-	    prev_sdgd = sdgd;
-	    sdgd = sdgd->next;
-	}
-	
-	if(sdgd != &sd_gendisk)
-	    printk("sd_gendisk not in disk chain.\n");
-	else {
-	    if(prev_sdgd != NULL)
-		prev_sdgd->next = sdgd->next;
-	    else
-		gendisk_head = sdgd->next;
-	}
-    }
-    
-    blksize_size[MAJOR_NR] = NULL;
-    blk_dev[MAJOR_NR].request_fn = NULL;
-    blk_size[MAJOR_NR] = NULL;  
-    hardsect_size[MAJOR_NR] = NULL;
-    read_ahead[MAJOR_NR] = 0;
-    sd_template.dev_max = 0;
-}
-#endif /* MODULE */
-
-/*
- * Overrides for Emacs so that we almost follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-indent-level: 4
- * c-brace-imaginary-offset: 0
- * c-brace-offset: -4
- * c-argdecl-indent: 4
- * c-label-offset: -4
- * c-continued-statement-offset: 4
- * c-continued-brace-offset: 0
- * indent-tabs-mode: nil
- * tab-width: 8
- * End:
- */