patch-1.3.94 linux/arch/m68k/atari/atapart.c

• Lines: 159
• Date: Sat Mar 30 14:11:04 1996
• Orig file: v1.3.93/linux/arch/m68k/atari/atapart.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/atari/atapart.c linux/arch/m68k/atari/atapart.c
@@ -0,0 +1,158 @@
+/*
+ * linux/atari/atapart.c
+ *
+ * Atari partition checking driver for 680x0 Linux
+ * Written by Andreas Schwab (schwab@ls5.informatik.uni-dortmund.de)
+ *
+ * 5/3/94 Roman Hodek:
+ *   Added some sanity checks
+ *   Linux device names start from 1 not 0, so I changed the initial value
+ *   for i to 1.
+ *
+ * 10/09/94 Guenther Kelleter:
+ *   Added support for ICD/Supra partition info.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file README.legal in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/fs.h>
+#include <linux/genhd.h>
+#include <linux/kernel.h>
+
+#include <asm/atari_rootsec.h>
+
+/* ++guenther: this should be settable by the user ("make config")?.
+ */
+#define ICD_PARTS
+
+extern int current_minor;
+
+void
+atari_check_partition (struct gendisk *hd, unsigned int dev)
+{
+  int i, minor = current_minor, m_lim = current_minor + hd->max_p;
+  struct buffer_head *bh;
+  struct rootsector *rs;
+  struct partition_info *pi;
+  ulong extensect;
+#ifdef ICD_PARTS
+  int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
+#endif
+
+  bh = bread (dev, 0, 1024);
+  if (!bh)
+    {
+      printk (" unable to read block 0\n");
+      return;
+    }
+
+  rs = (struct rootsector *) bh->b_data;
+  printk ("  %s%c:", hd->major_name, 'a' + (minor >> hd->minor_shift));
+
+  pi = &rs->part[0];
+  for (i = 1; pi < &rs->part[4] && minor < m_lim; i++, minor++, pi++)
+    {
+      if (pi->flg & 1)
+  /* active partition */
+  {
+    if (memcmp (pi->id, "XGM", 3) == 0)
+      /* extension partition */
+      {
+        struct rootsector *xrs;
+        struct buffer_head *xbh;
+        ulong partsect;
+
+#ifdef ICD_PARTS
+        part_fmt = 1;
+#endif
+        partsect = extensect = pi->st;
+        while (1)
+      {
+        xbh = bread (dev, partsect / 2, 1024);
+        if (!xbh)
+          {
+            printk (" block %ld read failed\n", partsect);
+            return;
+          }
+        if (partsect & 1)
+          xrs = (struct rootsector *) &xbh->b_data[512];
+        else
+          xrs = (struct rootsector *) &xbh->b_data[0];
+
+		/* ++roman: sanity check: bit 0 of flg field must be set */
+		if (!(xrs->part[0].flg & 1)) {
+			printk( "\nFirst sub-partition in extended partition is not valid!\n" );
+			break;
+		}
+		
+        hd->part[minor].start_sect = partsect + xrs->part[0].st;
+        hd->part[minor].nr_sects = xrs->part[0].siz;
+        printk (" %s%c%d", hd->major_name,
+            'a' + (minor >> hd->minor_shift), i);
+
+		if (!(xrs->part[1].flg & 1)) {
+			/* end of linked partition list */
+			brelse( xbh );
+			break;
+		}
+		if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
+			printk( "\nID of extended partion is not XGM!\n" );
+			brelse( xbh );
+			break;
+		}
+		
+		partsect = xrs->part[1].st + extensect;
+        brelse (xbh);
+        i++;
+        minor++;
+        if (minor >= m_lim) {
+			printk( "\nMaximum number of partitions reached!\n" );
+			break;
+		}
+      }
+      }
+    else
+      {
+        /* we don't care about other id's */
+        hd->part[minor].start_sect = pi->st;
+        hd->part[minor].nr_sects = pi->siz;
+        printk (" %s%c%d", hd->major_name,
+            'a' + (minor >> hd->minor_shift), i);
+
+      }
+  }
+    }
+#ifdef ICD_PARTS
+  if ( part_fmt!=1 ) /* no extended partitions -> test ICD-format */
+  {
+    pi = &rs->icdpart[0];
+    /* sanity check: no ICD format if first partion invalid */
+    if (memcmp (pi->id, "GEM", 3) == 0 ||
+        memcmp (pi->id, "BGM", 3) == 0 ||
+        memcmp (pi->id, "RAW", 3) == 0 )
+    {
+      for (i = 1; pi < &rs->icdpart[8] && minor < m_lim; i++, minor++, pi++)
+      {
+        /* accept only GEM,BGM,RAW partitions */
+        if (pi->flg & 1 && 
+            (memcmp (pi->id, "GEM", 3) == 0 ||
+             memcmp (pi->id, "BGM", 3) == 0 ||
+             memcmp (pi->id, "RAW", 3) == 0) )
+        {
+          part_fmt = 2;
+          hd->part[minor].start_sect = pi->st;
+          hd->part[minor].nr_sects = pi->siz;
+          printk (" %s%c%d", hd->major_name,
+              'a' + (minor >> hd->minor_shift), i);
+        }
+      }
+    }
+  }
+#endif
+  brelse (bh);
+
+  printk ("\n");
+}
+