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authorThomas Schwinge <tschwinge@gnu.org>2006-10-08 13:38:25 +0000
committerThomas Schwinge <tschwinge@gnu.org>2009-06-18 00:26:42 +0200
commitb07c6b082f978e1e9944f63670467d8ed0d9ea76 (patch)
tree51648ce1c4fc6e104aa024e47bf48d15203213a0 /linux/dev/drivers
parente5bfac069477a91c84a71f1f9a7c5175eb7d7cb3 (diff)
2006-10-08 Thomas Schwinge <tschwinge@gnu.org>
* linux/dev/drivers/scsi/sd.c: Move file... * linux/src/drivers/scsi/sd.c: ... here.
Diffstat (limited to 'linux/dev/drivers')
-rw-r--r--linux/dev/drivers/scsi/sd.c1691
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:
- */