patch-1.3.5 linux/drivers/scsi/sd.c
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- Lines: 2427
- Date:
Thu Jun 29 12:37:45 1995
- Orig file:
v1.3.4/linux/drivers/scsi/sd.c
- Orig date:
Fri Jun 16 22:02:55 1995
diff -u --recursive --new-file v1.3.4/linux/drivers/scsi/sd.c linux/drivers/scsi/sd.c
@@ -1,19 +1,19 @@
/*
- * sd.c Copyright (C) 1992 Drew Eckhardt
- * Copyright (C) 1993, 1994, 1995 Eric Youngdale
+ * 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
+ * Linux scsi disk driver
+ * Initial versions: Drew Eckhardt
+ * Subsequent revisions: Eric Youngdale
*
- * <drew@colorado.edu>
+ * <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.
+ * Modified by Eric Youngdale eric@aib.com to support loadable
+ * low-level scsi drivers.
*/
#include <linux/fs.h>
@@ -35,20 +35,20 @@
#include <linux/genhd.h>
/*
-static const char RCSid[] = "$Header:";
-*/
+ * static const char RCSid[] = "$Header:";
+ */
#define MAX_RETRIES 5
/*
- * Time out in seconds for disks and Magneto-opticals (which are slower).
+ * Time out in seconds for disks and Magneto-opticals (which are slower).
*/
-#define SD_TIMEOUT 600
+#define SD_TIMEOUT 700
#define SD_MOD_TIMEOUT 750
-#define CLUSTERABLE_DEVICE(SC) (SC->host->hostt->use_clustering && \
- SC->device->type != TYPE_MOD)
+#define CLUSTERABLE_DEVICE(SC) (SC->host->use_clustering && \
+ SC->device->type != TYPE_MOD)
struct hd_struct * sd;
int revalidate_scsidisk(int dev, int maxusage);
@@ -56,7 +56,7 @@
Scsi_Disk * rscsi_disks = NULL;
static int * sd_sizes;
static int * sd_blocksizes;
-static int * sd_hardsizes; /* Hardware sector size */
+static int * sd_hardsizes; /* Hardware sector size */
extern int sd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
@@ -73,1112 +73,1160 @@
static int sd_detect(Scsi_Device *);
static void sd_detach(Scsi_Device *);
-struct Scsi_Device_Template sd_template = {NULL, "disk", "sd", TYPE_DISK,
- SCSI_DISK_MAJOR, 0, 0, 0, 1,
- sd_detect, sd_init,
- sd_finish, sd_attach, sd_detach};
+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(MINOR(inode->i_rdev));
-
- if(target >= sd_template.dev_max || !rscsi_disks[target].device)
- return -ENXIO; /* No such device */
+ int target;
+ target = DEVICE_NR(MINOR(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);
-/* 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(!rscsi_disks[target].device->access_count)
+ if(!rscsi_disks[target].device->access_count)
sd_ioctl(inode, NULL, SCSI_IOCTL_DOORLOCK, 0);
- };
- /*
- * 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;
+ };
- rscsi_disks[target].device->access_count++;
- if (rscsi_disks[target].device->host->hostt->usage_count)
- (*rscsi_disks[target].device->host->hostt->usage_count)++;
- return 0;
+ /*
+ * 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;
+
+ 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;
- sync_dev(inode->i_rdev);
-
- target = DEVICE_NR(MINOR(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(rscsi_disks[target].device->removable) {
- if(!rscsi_disks[target].device->access_count)
+ int target;
+ sync_dev(inode->i_rdev);
+
+ target = DEVICE_NR(MINOR(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(void);
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 */
+ 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 */
+ 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 (void)
{
- int i;
-
- for (i = 0; i < sd_template.dev_max; ++i)
- if(rscsi_disks[i].device)
+ 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;
+ /* 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 on of several actions based on success or failure.
-*/
+ * 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 on 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 result = SCpnt->result;
+ int this_count = SCpnt->bufflen >> 9;
+
#ifdef DEBUG
- printk("sd%c : rw_intr(%d, %d)\n", 'a' + MINOR(SCpnt->request.dev), SCpnt->host->host_no, result);
+ printk("sd%c : rw_intr(%d, %d)\n", 'a' + MINOR(SCpnt->request.dev),
+ SCpnt->host->host_no, result);
#endif
+
+ /*
+ * 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.
+ */
-/*
- 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 (!result) {
-
+ if (!result) {
+
#ifdef DEBUG
- printk("sd%c : %d sectors remain.\n", 'a' + MINOR(SCpnt->request.dev), SCpnt->request.nr_sectors);
- printk("use_sg is %d\n ",SCpnt->use_sg);
+ printk("sd%c : %d sectors remain.\n", 'a' + MINOR(SCpnt->request.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++) {
+ 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);
+ 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);
- };
- };
- scsi_free(SCpnt->buffer, SCpnt->sglist_len); /* Free list of scatter-gather pointers */
- } else {
- if (SCpnt->buffer != SCpnt->request.buffer) {
+ 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)
- {
+ 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.dev));
+ printk("sd%c : handling page request, no buffer\n",
+ 'a' + MINOR(SCpnt->request.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, this_count);
- requeue_sd_request(SCpnt);
- return;
- }
-
-/* Free up any indirection buffers we allocated for DMA purposes. */
+ /*
+ * 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, this_count);
+ requeue_sd_request(SCpnt);
+ return;
+ }
+
+ /* 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++) {
+ 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,
+ 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);
+ 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 */
+ 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);
+ 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);
+ 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.
+ */
-/*
- 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) {
+ 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.
-*/
+ /*
+ * 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.dev)].remap
- {
+ {
result = 0;
- }
+ }
else
-
#endif
- }
-
- if ((SCpnt->sense_buffer[0] & 0x7f) == 0x70) {
+ }
+
+ if ((SCpnt->sense_buffer[0] & 0x7f) == 0x70) {
if ((SCpnt->sense_buffer[2] & 0xf) == UNIT_ATTENTION) {
- if(rscsi_disks[DEVICE_NR(SCpnt->request.dev)].device->removable) {
- /* detected disc change. set a bit and quietly refuse */
- /* further access. */
-
- rscsi_disks[DEVICE_NR(SCpnt->request.dev)].device->changed = 1;
- SCpnt = end_scsi_request(SCpnt, 0, this_count);
- requeue_sd_request(SCpnt);
- return;
- }
+ if(rscsi_disks[DEVICE_NR(SCpnt->request.dev)].device->removable) {
+ /* detected disc change. set a bit and quietly refuse
+ * further access.
+ */
+ rscsi_disks[DEVICE_NR(SCpnt->request.dev)].device->changed = 1;
+ SCpnt = end_scsi_request(SCpnt, 0, this_count);
+ 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 have read past the end
-of the disk.
-*/
+ }
+
+
+ /* 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 have read
+ * past the end of the disk.
+ */
- if (SCpnt->sense_buffer[2] == ILLEGAL_REQUEST) {
+ if (SCpnt->sense_buffer[2] == ILLEGAL_REQUEST) {
if (rscsi_disks[DEVICE_NR(SCpnt->request.dev)].ten) {
- rscsi_disks[DEVICE_NR(SCpnt->request.dev)].ten = 0;
- requeue_sd_request(SCpnt);
- result = 0;
+ rscsi_disks[DEVICE_NR(SCpnt->request.dev)].ten = 0;
+ requeue_sd_request(SCpnt);
+ result = 0;
} else {
+ /* ???? */
}
- }
- } /* driver byte != 0 */
- if (result) {
- printk("SCSI disk error : host %d id %d lun %d return code = %x\n",
- rscsi_disks[DEVICE_NR(SCpnt->request.dev)].device->host->host_no,
- rscsi_disks[DEVICE_NR(SCpnt->request.dev)].device->id,
- rscsi_disks[DEVICE_NR(SCpnt->request.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;
}
+ } /* 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.dev)].device->host->host_no,
+ rscsi_disks[DEVICE_NR(SCpnt->request.dev)].device->channel,
+ rscsi_disks[DEVICE_NR(SCpnt->request.dev)].device->id,
+ rscsi_disks[DEVICE_NR(SCpnt->request.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.
-*/
+ * 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;
- struct request * req = NULL;
- unsigned long flags;
- int flag = 0;
-
- save_flags(flags);
- while (1==1){
- cli();
- if (CURRENT != NULL && CURRENT->dev == -1) {
- restore_flags(flags);
- return;
- };
-
- INIT_SCSI_REQUEST;
-
+ Scsi_Cmnd * SCpnt = NULL;
+ struct request * req = NULL;
+ unsigned long flags;
+ int flag = 0;
+
+ save_flags(flags);
+ while (1==1){
+ cli();
+ if (CURRENT != NULL && CURRENT->dev == -1) {
+ restore_flags(flags);
+ return;
+ };
+
+ INIT_SCSI_REQUEST;
+
+ /* 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.
+ */
-/* 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(MINOR(CURRENT->dev))].device, 0);
- else SCpnt = NULL;
+ if (flag++ == 0)
+ SCpnt = allocate_device(&CURRENT,
+ rscsi_disks[DEVICE_NR(MINOR(CURRENT->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);
- /*
- * 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 and 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 and
+ * slip in a request in between somewhere.
+ */
-/* This is a performance enhancement. We dig down into the request list and
- try and 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 and 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(MINOR(req->dev))].device);
- if(SCpnt) break;
- req1 = req;
- req = req->next;
- };
- if (SCpnt && req->dev == -1) {
- 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 */
+ 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(MINOR(req->dev))].device);
+ if(SCpnt) break;
+ req1 = req;
+ req = req->next;
+ };
+ if (SCpnt && req->dev == -1) {
+ 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, 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.dev <= 0) {
- do_sd_request();
- return;
- }
-
- dev = MINOR(SCpnt->request.dev);
- block = SCpnt->request.sector;
- this_count = 0;
-
-#ifdef DEBUG
- printk("Doing sd request, dev = %d, block = %d\n", dev, block);
-#endif
-
- if (dev >= (sd_template.dev_max << 4) ||
- !rscsi_disks[DEVICE_NR(dev)].device ||
- block + SCpnt->request.nr_sectors > sd[dev].nr_sects)
- {
- SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
- goto repeat;
- }
-
- block += sd[dev].start_sect;
- dev = DEVICE_NR(dev);
-
- 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;
- }
+ int dev, 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.dev <= 0) {
+ do_sd_request();
+ return;
+ }
+
+ dev = MINOR(SCpnt->request.dev);
+ block = SCpnt->request.sector;
+ this_count = 0;
#ifdef DEBUG
- printk("sd%c : real dev = /dev/sd%c, block = %d\n", 'a' + MINOR(SCpnt->request.dev), dev, block);
+ printk("Doing sd request, dev = %d, block = %d\n", dev, block);
#endif
-
+
+ if (dev >= (sd_template.dev_max << 4) ||
+ !rscsi_disks[DEVICE_NR(dev)].device ||
+ block + SCpnt->request.nr_sectors > sd[dev].nr_sects)
+ {
+ SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
+ goto repeat;
+ }
+
+ block += sd[dev].start_sect;
+ dev = DEVICE_NR(dev);
+
+ if (rscsi_disks[dev].device->changed)
+ {
/*
- * 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.
+ * quietly refuse to do anything to a changed disc until the changed
+ * bit has been reset
*/
- 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;
+ /* 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' + MINOR(SCpnt->request.dev), 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)
+
+ 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(!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(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)
+ };
+ 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) {
+
+ 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;
+ ((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--;
+ 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 */
- count = 512;/* scsi_malloc can only allocate in chunks of 512 bytes*/
- while( count < (SCpnt->use_sg * sizeof(struct scatterlist)))
+ SCpnt->use_sg = count; /* Number of chains */
+ count = 512;/* scsi_malloc can only allocate in chunks of 512 bytes */
+ while( count < (SCpnt->use_sg * sizeof(struct scatterlist)))
count = count << 1;
- 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);
- memset(sgpnt, 0, count); /* Zero so it is easy to fill */
- if (!sgpnt) {
+ 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 */
+ SCpnt->use_sg = 0; /* No memory left - bail out */
this_count = SCpnt->request.current_nr_sectors;
buff = SCpnt->request.buffer;
- } else {
+ } 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 and 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 */
+
+ 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 and 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 scatter-gather 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);
+ 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;
+ SCpnt->use_sg = count;
+ this_count = counted -= bh->b_size >> 9;
+ break;
+ };
+
};
-
- /* 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 */
+
+ /* 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_count = counted; /* This is actually how many we are going to transfer */
-
- 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");
+
+ /* 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 &&
+ 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;
+ buff = bounce_buffer;
else
- buff = (char *) scsi_malloc(this_count << 9);
+ 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.");
+ 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);
- };
+ memcpy(buff, (char *)SCpnt->request.buffer, this_count << 9);
};
+ };
#ifdef DEBUG
- printk("sd%c : %s %d/%d 512 byte blocks.\n", 'a' + MINOR(SCpnt->request.dev),
- (SCpnt->request.cmd == WRITE) ? "writing" : "reading",
- this_count, SCpnt->request.nr_sectors);
+ printk("sd%c : %s %d/%d 512 byte blocks.\n",
+ 'a' + MINOR(SCpnt->request.dev),
+ (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);
+
+ 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(dev_t full_dev){
- int retval;
- int target;
- struct inode inode;
- int flag = 0;
-
- target = DEVICE_NR(MINOR(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 */
- retval = sd_ioctl(&inode, NULL, SCSI_IOCTL_TEST_UNIT_READY, 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].device->changed = 1;
- return 1; /* This will force a flush, if called from
- check_disk_change */
- };
-
- retval = rscsi_disks[target].device->changed;
- if(!flag) rscsi_disks[target].device->changed = 0;
- return retval;
+ int retval;
+ int target;
+ struct inode inode;
+ int flag = 0;
+
+ target = DEVICE_NR(MINOR(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 */
+ retval = sd_ioctl(&inode, NULL, SCSI_IOCTL_TEST_UNIT_READY, 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].device->changed = 1;
+ return 1; /* This will force a flush, if called from
+ * check_disk_change */
+ };
+
+ 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->dev = 0xfffe; /* Busy, but indicate request done */
-
- if (req->sem != NULL) {
- up(req->sem);
- }
+ struct request * req;
+
+ req = &SCpnt->request;
+ req->dev = 0xfffe; /* 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 */
- if (current == task[0]){
- do{
- cmd[0] = TEST_UNIT_READY;
- cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
- memset ((void *) &cmd[2], 0, 8);
- SCpnt->request.dev = 0xffff; /* Mark as really busy again */
- SCpnt->cmd_len = 0;
- SCpnt->sense_buffer[0] = 0;
- SCpnt->sense_buffer[2] = 0;
-
- scsi_do_cmd (SCpnt,
- (void *) cmd, (void *) buffer,
- 512, sd_init_done, SD_TIMEOUT,
- MAX_RETRIES);
-
- while(SCpnt->request.dev != 0xfffe) barrier();
-
- the_result = SCpnt->result;
-
- /* 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) {
- int time1;
- if(!spintime){
- printk( "sd%c: Spinning up disk...", 'a' + i );
- 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->request.dev = 0xffff; /* Mark as really busy again */
- SCpnt->cmd_len = 0;
- SCpnt->sense_buffer[0] = 0;
- SCpnt->sense_buffer[2] = 0;
-
- scsi_do_cmd (SCpnt,
- (void *) cmd, (void *) buffer,
- 512, sd_init_done, SD_TIMEOUT,
- MAX_RETRIES);
-
- while(SCpnt->request.dev != 0xfffe) barrier();
-
- spintime = jiffies;
- };
-
- time1 = jiffies;
- while(jiffies < time1 + HZ); /* 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" );
- }
- }; /* current == task[0] */
-
-
- 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->request.dev = 0xffff; /* Mark as really busy again */
- SCpnt->cmd_len = 0;
- SCpnt->sense_buffer[0] = 0;
- SCpnt->sense_buffer[2] = 0;
-
- scsi_do_cmd (SCpnt,
- (void *) cmd, (void *) buffer,
- 8, sd_init_done, SD_TIMEOUT,
- MAX_RETRIES);
+ unsigned char cmd[10];
+ unsigned char *buffer;
+ unsigned long spintime;
+ int the_result, retries;
+ Scsi_Cmnd * SCpnt;
- if (current == task[0])
- while(SCpnt->request.dev != 0xfffe) barrier();
- else
- if (SCpnt->request.dev != 0xfffe){
- struct semaphore sem = MUTEX_LOCKED;
- SCpnt->request.sem = &sem;
- down(&sem);
- /* Hmm.. Have to ask about this one.. */
- while (SCpnt->request.dev != 0xfffe) schedule();
- };
-
- the_result = SCpnt->result;
- retries--;
-
- } while(the_result && retries);
-
- SCpnt->request.dev = -1; /* 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)
+ /* 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 */
+ if (current->pid == 0){
+ 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->request.dev = 0xffff; /* Mark as really busy again */
+ SCpnt->cmd_len = 0;
+ SCpnt->sense_buffer[0] = 0;
+ SCpnt->sense_buffer[2] = 0;
+
+ scsi_do_cmd (SCpnt,
+ (void *) cmd, (void *) buffer,
+ 512, sd_init_done, SD_TIMEOUT,
+ MAX_RETRIES);
+
+ while(SCpnt->request.dev != 0xfffe) barrier();
+
+ 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) {
+ int time1;
+ if(!spintime){
+ printk( "sd%c: Spinning up disk...", 'a' + i );
+ 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 */
+ /* Mark as really busy again */
+ SCpnt->request.dev = 0xffff;
+ SCpnt->cmd_len = 0;
+ SCpnt->sense_buffer[0] = 0;
+ SCpnt->sense_buffer[2] = 0;
+
+ scsi_do_cmd (SCpnt,
+ (void *) cmd, (void *) buffer,
+ 512, sd_init_done, SD_TIMEOUT,
+ MAX_RETRIES);
+
+ while(SCpnt->request.dev != 0xfffe)
+ barrier();
+
+ spintime = jiffies;
+ };
+
+ time1 = jiffies;
+ while(jiffies < time1 + HZ); /* 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" );
+ }
+ }; /* current->pid == 0 */
+
+
+ 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->request.dev = 0xffff; /* Mark as really busy again */
+ SCpnt->cmd_len = 0;
+ SCpnt->sense_buffer[0] = 0;
+ SCpnt->sense_buffer[2] = 0;
+
+ scsi_do_cmd (SCpnt,
+ (void *) cmd, (void *) buffer,
+ 8, sd_init_done, SD_TIMEOUT,
+ MAX_RETRIES);
+
+ if (current->pid == 0)
+ while(SCpnt->request.dev != 0xfffe)
+ barrier();
+ else
+ if (SCpnt->request.dev != 0xfffe){
+ struct semaphore sem = MUTEX_LOCKED;
+ SCpnt->request.sem = &sem;
+ down(&sem);
+ /* Hmm.. Have to ask about this one.. */
+ while (SCpnt->request.dev != 0xfffe)
+ schedule();
+ };
+
+ the_result = SCpnt->result;
+ retries--;
+
+ } while(the_result && retries);
+
+ SCpnt->request.dev = -1; /* 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)
{
- printk ("sd%c : READ CAPACITY failed.\n"
- "sd%c : status = %x, message = %02x, host = %d, driver = %02x \n",
- 'a' + i, 'a' + i,
- status_byte(the_result),
- msg_byte(the_result),
- host_byte(the_result),
- driver_byte(the_result)
- );
- if (driver_byte(the_result) & DRIVER_SENSE)
- printk("sd%c : extended sense code = %1x \n", 'a' + i, SCpnt->sense_buffer[2] & 0xf);
- else
- printk("sd%c : sense not available. \n", 'a' + i);
-
- printk("sd%c : block size assumed to be 512 bytes, disk size 1GB. \n", 'a' + i);
- 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;
-
+ printk ("sd%c : READ CAPACITY failed.\n"
+ "sd%c : status = %x, message = %02x, host = %d, driver = %02x \n",
+ 'a' + i, 'a' + i,
+ status_byte(the_result),
+ msg_byte(the_result),
+ host_byte(the_result),
+ driver_byte(the_result)
+ );
+ if (driver_byte(the_result) & DRIVER_SENSE)
+ printk("sd%c : extended sense code = %1x \n",
+ 'a' + i, SCpnt->sense_buffer[2] & 0xf);
+ else
+ printk("sd%c : sense not available. \n", 'a' + i);
+
+ printk("sd%c : block size assumed to be 512 bytes, disk size 1GB. \n",
+ 'a' + i);
+ 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
+ else
{
- rscsi_disks[i].capacity = (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 != 512 &&
- rscsi_disks[i].sector_size != 1024 &&
- rscsi_disks[i].sector_size != 256)
+ rscsi_disks[i].capacity = (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 != 512 &&
+ rscsi_disks[i].sector_size != 1024 &&
+ rscsi_disks[i].sector_size != 256)
{
- printk ("sd%c : unsupported sector size %d.\n",
- 'a' + i, rscsi_disks[i].sector_size);
- 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--;
- return i;
- };
+ printk ("sd%c : unsupported sector size %d.\n",
+ 'a' + i, rscsi_disks[i].sector_size);
+ 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--;
+ return i;
+ };
}
{
- /*
- The msdos fs need 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;
- int hard_sector = rscsi_disks[i].sector_size;
- /* There is 16 minor allocated for each devices */
- for (m=i<<4; m<((i+1)<<4); m++){
- sd_hardsizes[m] = hard_sector;
- }
- printk ("SCSI Hardware sector size is %d bytes on device sd%c\n"
- ,hard_sector,i+'a');
+ /*
+ * The msdos fs need 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;
+ int hard_sector = rscsi_disks[i].sector_size;
+ /* There is 16 minor allocated for each devices */
+ for (m=i<<4; m<((i+1)<<4); m++){
+ sd_hardsizes[m] = hard_sector;
+ }
+ printk ("SCSI Hardware sector size is %d bytes on device sd%c\n",
+ hard_sector,i+'a');
}
- if(rscsi_disks[i].sector_size == 1024)
- rscsi_disks[i].capacity <<= 1; /* Change this into 512 byte sectors */
- if(rscsi_disks[i].sector_size == 256)
- rscsi_disks[i].capacity >>= 1; /* Change this into 512 byte sectors */
+ 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 */
}
-
- rscsi_disks[i].ten = 1;
- rscsi_disks[i].remap = 1;
- scsi_free(buffer, 512);
- return i;
+
+ 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.
-*/
+ * The sd_init() function looks at all SCSI drives present, determines
+ * their size, and reads partition table entries for them.
+ */
static void sd_init()
{
- int i;
- static int sd_registered = 0;
-
- if (sd_template.dev_noticed == 0) return;
-
- if(!sd_registered) {
+ int i;
+ static int sd_registered = 0;
+
+ if (sd_template.dev_noticed == 0) return;
+
+ if(!sd_registered) {
if (register_blkdev(MAJOR_NR,"sd",&sd_fops)) {
- printk("Unable to get major %d for SCSI disk\n",MAJOR_NR);
- return;
+ printk("Unable to get major %d for SCSI disk\n",MAJOR_NR);
+ return;
}
sd_registered++;
- }
-
- /* We do not support attaching loadable devices yet. */
- if(rscsi_disks) return;
-
- 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) *
+ }
+
+ /* We do not support attaching loadable devices yet. */
+ if(rscsi_disks) return;
+
+ 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);
- 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(struct hd_struct), 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;
-
+
+ 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;
+
}
static void sd_finish()
{
- int i;
-
- blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
-
- 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)
- {
- i = sd_init_onedisk(i);
- if (scsi_loadable_module_flag
- && !rscsi_disks[i].has_part_table) {
- sd_sizes[i << 4] = rscsi_disks[i].capacity;
- revalidate_scsidisk(i << 4, 0);
- }
- 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;
- /* 64 sector read-ahead */
- else
- read_ahead[MAJOR_NR] = 4; /* 4 sector read-ahead */
-
- return;
+ int i;
+
+ blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
+
+ 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)
+ {
+ i = sd_init_onedisk(i);
+ if (scsi_loadable_module_flag
+ && !rscsi_disks[i].has_part_table) {
+ sd_sizes[i << 4] = rscsi_disks[i].capacity;
+ revalidate_scsidisk(i << 4, 0);
+ }
+ 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;
+ /* 64 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;
-
- printk("Detected scsi disk sd%c at scsi%d, id %d, lun %d\n",
- 'a'+ (sd_template.dev_noticed++),
- SDp->host->host_no , SDp->id, SDp->lun);
-
- return 1;
-
+ if(SDp->type != TYPE_DISK && SDp->type != TYPE_MOD) return 0;
+
+ printk("Detected scsi disk sd%c at scsi%d, channel %d, id %d, lun %d\n",
+ 'a'+ (sd_template.dev_noticed++),
+ SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
+
+ 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) {
+ 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;
+ }
+
+ 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
@@ -1188,111 +1236,177 @@
#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.
+ * 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(int dev, int maxusage){
- int target, major;
- struct gendisk * gdev;
- unsigned long flags;
- int max_p;
- int start;
- int i;
-
- target = DEVICE_NR(MINOR(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;
- major = MAJOR_NR << 8;
-
- for (i=max_p - 1; i >=0 ; i--) {
- sync_dev(major | start | i);
- invalidate_inodes(major | start | i);
- invalidate_buffers(major | start | i);
- gdev->part[start+i].start_sect = 0;
- gdev->part[start+i].nr_sects = 0;
- };
-
+ int target, major;
+ struct gendisk * gdev;
+ unsigned long flags;
+ int max_p;
+ int start;
+ int i;
+
+ target = DEVICE_NR(MINOR(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;
+ major = MAJOR_NR << 8;
+
+ for (i=max_p - 1; i >=0 ; i--) {
+ sync_dev(major | start | i);
+ invalidate_inodes(major | start | i);
+ invalidate_buffers(major | start | i);
+ gdev->part[start+i].start_sect = 0;
+ gdev->part[start+i].nr_sects = 0;
+ };
+
#ifdef MAYBE_REINIT
- MAYBE_REINIT;
+ MAYBE_REINIT;
#endif
-
- gdev->part[start].nr_sects = CAPACITY;
- resetup_one_dev(gdev, target);
-
- DEVICE_BUSY = 0;
- return 0;
+
+ gdev->part[start].nr_sects = CAPACITY;
+ resetup_one_dev(gdev, target);
+
+ DEVICE_BUSY = 0;
+ return 0;
}
static int fop_revalidate_scsidisk(dev_t dev){
- return revalidate_scsidisk(dev, 0);
+ return revalidate_scsidisk(dev, 0);
}
static void sd_detach(Scsi_Device * SDp)
{
- Scsi_Disk * dpnt;
- int i;
- int max_p;
- int major;
- 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;
- major = MAJOR_NR << 8;
+ Scsi_Disk * dpnt;
+ int i;
+ int max_p;
+ int major;
+ 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;
+ major = MAJOR_NR << 8;
+
+ for (i=max_p - 1; i >=0 ; i--) {
+ sync_dev(major | start | i);
+ invalidate_inodes(major | start | i);
+ invalidate_buffers(major | start | i);
+ sd_gendisk.part[start+i].start_sect = 0;
+ sd_gendisk.part[start+i].nr_sects = 0;
+ sd_sizes[start+i] = 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;
+}
- for (i=max_p - 1; i >=0 ; i--) {
- sync_dev(major | start | i);
- invalidate_inodes(major | start | i);
- invalidate_buffers(major | start | i);
- sd_gendisk.part[start+i].start_sect = 0;
- sd_gendisk.part[start+i].nr_sects = 0;
- sd_sizes[start+i] = 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;
+#ifdef MODULE
+#include <linux/module.h>
+#include <linux/version.h>
+
+char kernel_version[] = UTS_RELEASE;
+
+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;
+
+ if (MOD_IN_USE) {
+ printk(KERN_INFO __FILE__ ": module is in use, remove rejected\n");
+ return;
}
- return;
+ scsi_unregister_module(MODULE_SCSI_DEV, &sd_template);
+ unregister_blkdev(SCSI_GENERIC_MAJOR, "sd");
+ 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 follow Linus's tabbing style.
+ * 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: 8
+ * c-indent-level: 4
* c-brace-imaginary-offset: 0
- * c-brace-offset: -8
- * c-argdecl-indent: 8
- * c-label-offset: -8
- * c-continued-statement-offset: 8
+ * 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:
*/
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov
with Sam's (original) version of this