struct scsi_device *sb_to_scsidev(struct super_block *sb) {
int rc = 0;
struct block_device *bdev = sb->s_bdev;
struct gendisk *gp = NULL;
struct scsi_disk *sdkp = NULL;
struct scsi_device *scsidev = NULL;
if(bdev)
{
if( (gp = bdev->bd_disk) != NULL)
{
if ((sdkp = scsi_disk_get(gp)) == NULL)
rc = ENXIO;
} else {
rc = ENODEV;
}
} else {
rc = ENODEV;
}
if (rc)
goto out;
if((scsidev = scsi_dev_get(sdkp)) == NULL)
rc = ENXIO;
out:
if (rc != 0)
printk("sb_to_scsidev failed! gendisk:%p scsi_disk:%p err:%d\n"
, gp, sdkp, rc);
return scsidev;
}
int pio_write_corefile(int offset) {
/*
* The original idea here is to write to the "alternate
* application partition". This has some problems though,
* spec. with developer boxes. For now, we're going to
* assume this won't be called from a dev build. (This is so
* broken it bothers me, we could write it to swap -32M -1M)
*
* The second broken thing here is we don't account for
* actual size of the memory of the box in question. We
* assume it's 32Meg. This is somewhat easily overcome by
* just checking the config variables. However, I'm loathe
* to do that at this point since having variable size input
* just risks adding a new bug to the system. (Something I don't
* want to do at this point in the release cycle)
*
* This is a *very basic* implementation of what we want to do.
* It starts at 0x80000000, goes for 32MB writing out to alternate
* application at either "offset 0", or "offset 1". Offset 0 is
* at the beginning of the partition. Offset 1 is 32MB into the
* partition. (ah, now you see why I don't want to deal with
* variable sizes)
*
* Cache flushing is not required as we're doing it PIO, which just
* pulls from cache. Of course, we're taking the kernel centric
* as opposed to hardware centric view of memory. This is reasonable
* because really, the core is just a bunch of kernel memory
* structures for the most part.
*
*/
struct block_device *bdev;
struct gendisk *gp;
struct scsi_disk *sdkp;
struct scsi_device *sdev;
struct ata_port *ap;
struct ata_device *dev;
int altpartition;
unsigned long secoffset = (CORE_SIZE / 512) * offset;
u32 csum; /* Currently unused */
static int core_written = 0;
/* Only 0 or 1 are valid offset values */
if(!(offset == 0 || offset == 1))
return -EINVAL;
/* If the root is sda4, then altap is sda7 and vice-versa */
if(ROOT_DEV == MKDEV(SCSI_DISK0_MAJOR, 4))
altpartition = 7;
else if(ROOT_DEV == MKDEV(SCSI_DISK0_MAJOR, 7))
altpartition = 4;
else
return -ENODEV;
if( (bdev = bdget(MKDEV(SCSI_DISK0_MAJOR, 0))) != NULL )
{
if( (gp = bdev->bd_disk) != NULL){
if ((sdkp = scsi_disk_get(gp)) == NULL){
return -ENXIO;
}
}
else{
return -ENODEV;
}
}
else{
return -ENODEV;
}
if((sdev = scsi_dev_get(sdkp)) == NULL)
{
return -ENXIO;
}
ap = ata_shost_to_port(sdev->host);
dev = ata_scsi_find_dev(ap, sdev);
if( ap == NULL || dev == NULL ){
return -ENXIO;
}
if(core_written != 0) {
printk("Core already written\n");
return -EINVAL;
}
core_written = 1;
/* Partition must be at least twice a CORE */
/* disk_get_part() increments ref count so need to release */
struct hd_struct *hd_info = disk_get_part(gp, altpartition);
if(hd_info->nr_sects < ((2 * CORE_SIZE) / 512)) {
/* release hd_info */
disk_put_part(hd_info);
return -ENODEV;
}
if(initdrive) {
/* Issue software reset, disable ide interrupts */
if(pio_reset(ap) < 0) {
/* release hd_info */
disk_put_part(hd_info);
return -ENODEV;
}
initdrive=0;
}
secoffset += hd_info->start_sect;
/* release hd_info */
disk_put_part(hd_info);
return pio_write_buffer(dev, ap, secoffset, (const u8*)CORE_START,
CORE_SIZE, &csum);
}
/* Returns number of sectors written */
int pio_write_buffer_to_swap(const u8* buf, unsigned int size, int secoffset,
u32 *csum) {
struct block_device *bdev = NULL;
struct gendisk *gp = NULL;
struct scsi_disk *sdkp = NULL;
struct scsi_device *sdev = NULL;
struct ata_port *ap = NULL;
struct ata_device *dev = NULL;
int written_sect;
unsigned long tsector;
if( (bdev = bdget(MKDEV(SWAPFS_MAJOR, SWAPFS_MINOR))) != NULL )
{
if( (gp = bdev->bd_disk) != NULL){
if ((sdkp = scsi_disk_get(gp)) == NULL){
return -ENXIO;
}
}
else{
return -ENODEV;
}
}
else{
return -ENODEV;
}
if((sdev = scsi_dev_get(sdkp)) == NULL)
{
return -ENXIO;
}
ap = ata_shost_to_port(sdev->host);
dev = ata_scsi_find_dev(ap, sdev);
if( ap == NULL || dev == NULL ){
return -ENXIO;
}
/*
* We adjust secoffset to write to the last 1MB of the device,
* this is because we don't want to rebuild swap mostly, and
* because we can use "lspanic" to grab the last tivo panic.
*
* We will track which one we've logged by bit-inverting
* the checksum.
*
*/
/* disk_get_part() increments ref count so need to release */
struct hd_struct *hd_info = disk_get_part(gp, SWAPFS_MINOR);
/* Partition must be at least 2 MB */
if(hd_info->nr_sects < (2* 1024 * 1024 / 512)){
goto HD_INFO_ERROR;
}
/* Offset by 1MB from end of partition */
secoffset += hd_info->nr_sects - (1 * 1024 * 1024 /512);
/* Make sure partition is sane size-wise */
if(hd_info->nr_sects < secoffset){
goto HD_INFO_ERROR;
}
if(hd_info->nr_sects - secoffset < ((size + 511)/512)) {
goto HD_INFO_ERROR;
}
if(initdrive) {
/* Issue software reset, disable ide interrupts */
if(pio_reset(ap) < 0) {
goto HD_INFO_ERROR;
}
initdrive=0;
}
tsector = hd_info->start_sect + secoffset;
written_sect = pio_write_buffer(dev, ap, tsector, buf, size, csum);
scsi_disk_put(sdkp);
/* release hd_info */
disk_put_part(hd_info);
return written_sect;
HD_INFO_ERROR:
/* release hd_info */
disk_put_part(hd_info);
return -ENODEV;
}
