Re: grub2 (1.97.1) on RAID0

[Felix Zielcke <fzielcke@z-51.de>]

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Am Donnerstag, den 12.11.2009, 12:40 +0100 schrieb André Fettouhi:
> That sucks big time! <Sad>
> 
> info@dupondje.be skrev:
> > To bad :)
> > Its not possible to use dmraid with Grub2 yet.
> >
> > I had to switch bad to grub1 because its not possible to get it working.
> > Hopefully some developper wants to implement this :)
> >
> > Sincerely,
> > Jean-Louis
> >

If you have some /dev/mapper/nvida_ pdc_ or isw_ device you can try
attached patch.
But it's a dirty way to implement it and not really tested.
I haven't checked it with recent releases but at the time I wrote it it
worked with my nvidia dmraid device.
isw_ devices seems to have different formats only one of them is
supported.
And pdc_ worked for Pavel but for someone else on IRC it didn't.



-- 
Felix Zielcke
Proud Debian Maintainer and GNU GRUB developer

[-- Attachment #2: dmraid.patch.5 --]
[-- Type: text/x-patch, Size: 5756 bytes --]

diff --git a/util/getroot.c b/util/getroot.c
index 120ab13..f1bfd4c 100644
--- a/util/getroot.c
+++ b/util/getroot.c
@@ -396,13 +396,38 @@ grub_guess_root_device (const char *dir)
 
   return os_dev;
 }
+int
+grub_util_is_dmraid (const char *os_dev)
+{
+  if (! strncmp (os_dev, "/dev/mapper/nvidia_", 19))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/isw_", 16))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/hpt37x_", 19))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/hpt45x_", 19))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/via_", 16))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/lsi_", 16))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/pdc_", 16))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/jmicron_", 20))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/asr_", 16))
+    return 1;
+  else if (! strncmp (os_dev, "/dev/mapper/sil_", 16))
+    return 1;
 
+  return 0;
+}
 int
 grub_util_get_dev_abstraction (const char *os_dev UNUSED)
 {
 #ifdef __linux__
   /* Check for LVM.  */
-  if (!strncmp (os_dev, "/dev/mapper/", 12))
+  if (!strncmp (os_dev, "/dev/mapper/", 12) && ! grub_util_is_dmraid (os_dev))
     return GRUB_DEV_ABSTRACTION_LVM;
 
   /* Check for RAID.  */
diff --git a/util/hostdisk.c b/util/hostdisk.c
index a06ecca..0d94ccd 100644
--- a/util/hostdisk.c
+++ b/util/hostdisk.c
@@ -25,6 +25,7 @@
 #include <grub/util/misc.h>
 #include <grub/util/hostdisk.h>
 #include <grub/misc.h>
+#include <grub/file.h>
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -819,6 +820,27 @@ convert_system_partition_to_system_disk (const char *os_dev)
 	  p[4] = '\0';
 	  return path;
 	}
+      /* If this is a Nvidia fake raid.  */
+      if (strncmp ("mapper/nvidia_", p, 14) == 0 && p[22] >= '0' && p[22] <= '9')
+	{
+	  p[sizeof ("mapper/nvidia_abcdefgh") - 1] = '\0';
+	  return path;
+	}
+      if (strncmp ("mapper/pdc_", p, 11) == 0 && p[20] >= '0' && p[20] <= '9')
+	{
+	  p[sizeof ("mapper/pdc_abcdefghi") - 1] = '\0';
+	  return path;
+	}
+      if (strncmp ("mapper/isw_", p, 11) == 0 && p[29] >= '0' && p[29] <= '9')
+	{
+	  p[sizeof ("mapper/isw_abcdefghij_Volume0") - 1] = '\0';
+	  return path;
+	}
+      if (strncmp ("mapper/isw_", p, 11) == 0 && p[27] >= '0' && p[27] <= '9')
+	{
+	  p[sizeof ("mapper/isw_abcdefghij_ARRAY") - 1] = '\0';
+	  return path;
+	}
     }
 
   return path;
@@ -869,6 +891,10 @@ device_is_wholedisk (const char *os_dev)
 
   if (os_dev[len - 1] < '0' || os_dev[len - 1] > '9')
     return 1;
+  if (strncmp ("/dev/mapper/isw_", os_dev, 16) == 0 && os_dev[34] == '\0')
+    return 1;
+  if (strncmp ("/dev/mapper/isw_", os_dev, 16) == 0 && os_dev[32] == '\0')
+    return 1;
   return 0;
 }
 #endif
@@ -935,7 +961,7 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
      does not count the extended partition and missing primary
      partitions.  Use same method as on Linux here.  */
   {
-    char *name;
+    char *name, *os_dev_uuid;
     grub_disk_t disk;
     int fd;
     struct hd_geometry hdg;
@@ -985,7 +1011,44 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
 
 	return 0;
       }
+    auto int find_partition_by_uuid (const char *name);
 
+    int find_partition_by_uuid (const char *name)
+    {
+      grub_device_t dev;
+
+      if (name[0] == 'f' && name[1] == 'd'
+	  && name[2] >= '0' && name[2] <= '9')
+	return 0;
+
+      dev = grub_device_open (name);
+      if (dev)
+	{
+	  grub_fs_t fs;
+
+	  fs = grub_fs_probe (dev);
+
+	  if (fs && fs->uuid)
+	    {
+	      char *uuid, *p;
+
+	      (fs->uuid) (dev, &uuid);
+	      if (grub_errno == GRUB_ERR_NONE && uuid)
+		{
+		  if (grub_strcasecmp (uuid, os_dev_uuid) == 0)
+		    {
+		      p = strchr (name, ',');
+		      dos_part = atoi (p);
+		      free (uuid);
+		      return 1;
+		    }
+		  free (uuid);
+		}
+	    }
+	  grub_device_close (dev);
+	}
+      return 0;
+    }
     name = make_device_name (drive, -1, -1);
 
     if (MAJOR (st.st_rdev) == FLOPPY_MAJOR)
@@ -1015,28 +1078,60 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
     if (hdg.start == 0 && device_is_wholedisk (os_dev))
       return name;
 
-    grub_util_info ("opening the device %s", name);
-    disk = grub_disk_open (name);
-    free (name);
-
-    if (! disk)
-      return 0;
 
-    grub_partition_iterate (disk, find_partition);
-    if (grub_errno != GRUB_ERR_NONE)
+    if (hdg.sectors == 0)
       {
-	grub_disk_close (disk);
-	return 0;
+	FILE *fp;
+	char *free_ptr, *p, *q;
+	int len = 512;
+
+	p = xmalloc (strlen (os_dev) + strlen ("blkid ") + 1);
+	strcpy (p, "blkid ");
+	strcat (p, os_dev);
+	fp = popen (p, "r");
+	free (p);
+	do {
+	  p = xmalloc (len);
+	  p = fgets (p, len, fp);
+	  if (! p)
+	    return 0;
+	  len *= 2;
+	} while (! strchr (p, '\n'));
+	free_ptr = p;
+	p = strstr (p , "UUID=");
+	if (! p)
+	  return 0;
+	p += strlen ("UUID=\"");
+	q = strchr (p, '\"');
+	if (q)
+	  *q = '\0';
+	os_dev_uuid = p;
+	pclose (fp);
+	grub_device_iterate (find_partition_by_uuid);
+	free (free_ptr);
       }
-
-    if (dos_part < 0)
+    else
       {
-	grub_disk_close (disk);
-	grub_error (GRUB_ERR_BAD_DEVICE,
-		    "cannot find the partition of `%s'", os_dev);
-	return 0;
-      }
+	grub_util_info ("opening the device %s", name);
+	disk = grub_disk_open (name);
+	free (name);
 
+	if (! disk)
+	  return 0;
+	grub_partition_iterate (disk, find_partition);
+	if (grub_errno != GRUB_ERR_NONE)
+	  {
+	    grub_disk_close (disk);
+	    return 0;
+	  }
+	if (dos_part < 0)
+	  {
+	    grub_disk_close (disk);
+	    grub_error (GRUB_ERR_BAD_DEVICE,
+			"cannot find the partition of `%s'", os_dev);
+	    return 0;
+	  }
+      }
     return make_device_name (drive, dos_part, bsd_part);
   }