Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 245 insertions, 0 deletions

diff --git a/drivers/scsi/scsicam.c b/drivers/scsi/scsicam.c
new file mode 100644
index 000000000000..b78354fc4b17
--- /dev/null
+++ b/drivers/scsi/scsicam.c
@@ -0,0 +1,245 @@
+/*
+ * scsicam.c - SCSI CAM support functions, use for HDIO_GETGEO, etc.
+ *
+ * Copyright 1993, 1994 Drew Eckhardt
+ *      Visionary Computing 
+ *      (Unix and Linux consulting and custom programming)
+ *      drew@Colorado.EDU
+ *      +1 (303) 786-7975
+ *
+ * For more information, please consult the SCSI-CAM draft.
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/genhd.h>
+#include <linux/kernel.h>
+#include <linux/blkdev.h>
+#include <linux/buffer_head.h>
+#include <asm/unaligned.h>
+
+#include <scsi/scsicam.h>
+
+
+static int setsize(unsigned long capacity, unsigned int *cyls, unsigned int *hds,
+                   unsigned int *secs);
+
+unsigned char *scsi_bios_ptable(struct block_device *dev)
+{
+        unsigned char *res = kmalloc(66, GFP_KERNEL);
+        if (res) {
+                struct block_device *bdev = dev->bd_contains;
+                Sector sect;
+                void *data = read_dev_sector(bdev, 0, &sect);
+                if (data) {
+                        memcpy(res, data + 0x1be, 66);
+                        put_dev_sector(sect);
+                } else {
+                        kfree(res);
+                        res = NULL;
+                }
+        }
+        return res;
+}
+EXPORT_SYMBOL(scsi_bios_ptable);
+
+/*
+ * Function : int scsicam_bios_param (struct block_device *bdev, ector_t capacity, int *ip)
+ *
+ * Purpose : to determine the BIOS mapping used for a drive in a 
+ *      SCSI-CAM system, storing the results in ip as required
+ *      by the HDIO_GETGEO ioctl().
+ *
+ * Returns : -1 on failure, 0 on success.
+ *
+ */
+
+int scsicam_bios_param(struct block_device *bdev, sector_t capacity, int *ip)
+{
+        unsigned char *p;
+        int ret;
+
+        p = scsi_bios_ptable(bdev);
+        if (!p)
+                return -1;
+
+        /* try to infer mapping from partition table */
+        ret = scsi_partsize(p, (unsigned long)capacity, (unsigned int *)ip + 2,
+                               (unsigned int *)ip + 0, (unsigned int *)ip + 1);
+        kfree(p);
+
+        if (ret == -1) {
+                /* pick some standard mapping with at most 1024 cylinders,
+                   and at most 62 sectors per track - this works up to
+                   7905 MB */
+                ret = setsize((unsigned long)capacity, (unsigned int *)ip + 2,
+                       (unsigned int *)ip + 0, (unsigned int *)ip + 1);
+        }
+
+        /* if something went wrong, then apparently we have to return
+           a geometry with more than 1024 cylinders */
+        if (ret || ip[0] > 255 || ip[1] > 63) {
+                if ((capacity >> 11) > 65534) {
+                        ip[0] = 255;
+                        ip[1] = 63;
+                } else {
+                        ip[0] = 64;
+                        ip[1] = 32;
+                }
+
+                if (capacity > 65535*63*255)
+                        ip[2] = 65535;
+                else
+                        ip[2] = (unsigned long)capacity / (ip[0] * ip[1]);
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL(scsicam_bios_param);
+
+/*
+ * Function : static int scsi_partsize(unsigned char *buf, unsigned long 
+ *     capacity,unsigned int *cyls, unsigned int *hds, unsigned int *secs);
+ *
+ * Purpose : to determine the BIOS mapping used to create the partition
+ *      table, storing the results in *cyls, *hds, and *secs 
+ *
+ * Returns : -1 on failure, 0 on success.
+ *
+ */
+
+int scsi_partsize(unsigned char *buf, unsigned long capacity,
+               unsigned int *cyls, unsigned int *hds, unsigned int *secs)
+{
+        struct partition *p = (struct partition *)buf, *largest = NULL;
+        int i, largest_cyl;
+        int cyl, ext_cyl, end_head, end_cyl, end_sector;
+        unsigned int logical_end, physical_end, ext_physical_end;
+
+
+        if (*(unsigned short *) (buf + 64) == 0xAA55) {
+                for (largest_cyl = -1, i = 0; i < 4; ++i, ++p) {
+                        if (!p->sys_ind)
+                                continue;
+#ifdef DEBUG
+                        printk("scsicam_bios_param : partition %d has system \n",
+                               i);
+#endif
+                        cyl = p->cyl + ((p->sector & 0xc0) << 2);
+                        if (cyl > largest_cyl) {
+                                largest_cyl = cyl;
+                                largest = p;
+                        }
+                }
+        }
+        if (largest) {
+                end_cyl = largest->end_cyl + ((largest->end_sector & 0xc0) << 2);
+                end_head = largest->end_head;
+                end_sector = largest->end_sector & 0x3f;
+
+                if (end_head + 1 == 0 || end_sector == 0)
+                        return -1;
+
+#ifdef DEBUG
+                printk("scsicam_bios_param : end at h = %d, c = %d, s = %d\n",
+                       end_head, end_cyl, end_sector);
+#endif
+
+                physical_end = end_cyl * (end_head + 1) * end_sector +
+                    end_head * end_sector + end_sector;
+
+                /* This is the actual _sector_ number at the end */
+                logical_end = get_unaligned(&largest->start_sect)
+                    + get_unaligned(&largest->nr_sects);
+
+                /* This is for >1023 cylinders */
+                ext_cyl = (logical_end - (end_head * end_sector + end_sector))
+                    / (end_head + 1) / end_sector;
+                ext_physical_end = ext_cyl * (end_head + 1) * end_sector +
+                    end_head * end_sector + end_sector;
+
+#ifdef DEBUG
+                printk("scsicam_bios_param : logical_end=%d physical_end=%d ext_physical_end=%d ext_cyl=%d\n"
+                  ,logical_end, physical_end, ext_physical_end, ext_cyl);
+#endif
+
+                if ((logical_end == physical_end) ||
+                  (end_cyl == 1023 && ext_physical_end == logical_end)) {
+                        *secs = end_sector;
+                        *hds = end_head + 1;
+                        *cyls = capacity / ((end_head + 1) * end_sector);
+                        return 0;
+                }
+#ifdef DEBUG
+                printk("scsicam_bios_param : logical (%u) != physical (%u)\n",
+                       logical_end, physical_end);
+#endif
+        }
+        return -1;
+}
+EXPORT_SYMBOL(scsi_partsize);
+
+/*
+ * Function : static int setsize(unsigned long capacity,unsigned int *cyls,
+ *      unsigned int *hds, unsigned int *secs);
+ *
+ * Purpose : to determine a near-optimal int 0x13 mapping for a
+ *      SCSI disk in terms of lost space of size capacity, storing
+ *      the results in *cyls, *hds, and *secs.
+ *
+ * Returns : -1 on failure, 0 on success.
+ *
+ * Extracted from
+ *
+ * WORKING                                                    X3T9.2
+ * DRAFT                                                        792D
+ *
+ *
+ *                                                        Revision 6
+ *                                                         10-MAR-94
+ * Information technology -
+ * SCSI-2 Common access method
+ * transport and SCSI interface module
+ * 
+ * ANNEX A :
+ *
+ * setsize() converts a read capacity value to int 13h
+ * head-cylinder-sector requirements. It minimizes the value for
+ * number of heads and maximizes the number of cylinders. This
+ * will support rather large disks before the number of heads
+ * will not fit in 4 bits (or 6 bits). This algorithm also
+ * minimizes the number of sectors that will be unused at the end
+ * of the disk while allowing for very large disks to be
+ * accommodated. This algorithm does not use physical geometry. 
+ */
+
+static int setsize(unsigned long capacity, unsigned int *cyls, unsigned int *hds,
+                   unsigned int *secs)
+{
+        unsigned int rv = 0;
+        unsigned long heads, sectors, cylinders, temp;
+
+        cylinders = 1024L;      /* Set number of cylinders to max */
+        sectors = 62L;          /* Maximize sectors per track */
+
+        temp = cylinders * sectors;     /* Compute divisor for heads */
+        heads = capacity / temp;        /* Compute value for number of heads */
+        if (capacity % temp) {  /* If no remainder, done! */
+                heads++;        /* Else, increment number of heads */
+                temp = cylinders * heads;       /* Compute divisor for sectors */
+                sectors = capacity / temp;      /* Compute value for sectors per
+                                                   track */
+                if (capacity % temp) {  /* If no remainder, done! */
+                        sectors++;      /* Else, increment number of sectors */
+                        temp = heads * sectors;         /* Compute divisor for cylinders */
+                        cylinders = capacity / temp;    /* Compute number of cylinders */
+                }
+        }
+        if (cylinders == 0)
+                rv = (unsigned) -1;     /* Give error if 0 cylinders */
+
+        *cyls = (unsigned int) cylinders;       /* Stuff return values */
+        *secs = (unsigned int) sectors;
+        *hds = (unsigned int) heads;
+        return (rv);
+}