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grub2/grub2-1.99-handle-more-dmraid.patch
Peter Jones dfcf823ef8 Handle dmraid better. 
Resolves: rhbz#742226
2011-11-07 11:41:53 -05:00

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From: Colin Watson <cjwatson@ubuntu.com>
Subject: Improve devmapper support
Date: 2011-05-18 07:35:47 +0000
=== modified file 'grub-core/kern/emu/getroot.c'
--- a/grub-core/kern/emu/getroot.c 2011-04-21 09:26:29 +0000
+++ b/grub-core/kern/emu/getroot.c 2011-05-18 07:35:47 +0000
@@ -34,6 +34,10 @@
#include <stdint.h>
#include <grub/util/misc.h>
+#ifdef HAVE_DEVICE_MAPPER
+# include <libdevmapper.h>
+#endif
+
#ifdef __GNU__
#include <hurd.h>
#include <hurd/lookup.h>
@@ -634,32 +638,65 @@
}
static int
-grub_util_is_dmraid (const char *os_dev)
+grub_util_is_lvm (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;
- else if (! strncmp (os_dev, "/dev/mapper/ddf1_", 17))
- return 1;
-
- return 0;
+ if ((strncmp ("/dev/mapper/", os_dev, 12) != 0))
+ return 0;
+
+#ifdef HAVE_DEVICE_MAPPER
+ {
+ struct dm_tree *tree;
+ uint32_t maj, min;
+ struct dm_tree_node *node = NULL;
+ const char *node_uuid;
+ struct stat st;
+
+ if (stat (os_dev, &st) < 0)
+ return 0;
+
+ tree = dm_tree_create ();
+ if (! tree)
+ {
+ grub_printf ("Failed to create tree\n");
+ grub_dprintf ("hostdisk", "dm_tree_create failed\n");
+ return 0;
+ }
+
+ maj = major (st.st_rdev);
+ min = minor (st.st_rdev);
+
+ if (! dm_tree_add_dev (tree, maj, min))
+ {
+ grub_dprintf ("hostdisk", "dm_tree_add_dev failed\n");
+ dm_tree_free (tree);
+ return 0;
+ }
+
+ node = dm_tree_find_node (tree, maj, min);
+ if (! node)
+ {
+ grub_dprintf ("hostdisk", "dm_tree_find_node failed\n");
+ dm_tree_free (tree);
+ return 0;
+ }
+ node_uuid = dm_tree_node_get_uuid (node);
+ if (! node_uuid)
+ {
+ grub_dprintf ("hostdisk", "%s has no DM uuid\n", os_dev);
+ dm_tree_free (tree);
+ return 0;
+ }
+ if (strncmp (node_uuid, "LVM-", 4) != 0)
+ {
+ dm_tree_free (tree);
+ return 0;
+ }
+ dm_tree_free (tree);
+ return 1;
+ }
+#else
+ return 1;
+#endif /* HAVE_DEVICE_MAPPER */
}
int
@@ -671,13 +708,11 @@
return GRUB_DEV_ABSTRACTION_NONE;
/* Check for LVM. */
- if (!strncmp (os_dev, "/dev/mapper/", 12)
- && ! grub_util_is_dmraid (os_dev)
- && strncmp (os_dev, "/dev/mapper/mpath", 17) != 0)
+ if (grub_util_is_lvm (os_dev))
return GRUB_DEV_ABSTRACTION_LVM;
/* Check for RAID. */
- if (!strncmp (os_dev, "/dev/md", 7))
+ if (!strncmp (os_dev, "/dev/md", 7) && ! grub_util_device_is_mapped (os_dev))
return GRUB_DEV_ABSTRACTION_RAID;
#endif
=== modified file 'grub-core/kern/emu/hostdisk.c'
--- a/grub-core/kern/emu/hostdisk.c 2011-05-09 16:59:35 +0000
+++ b/grub-core/kern/emu/hostdisk.c 2011-05-18 07:35:47 +0000
@@ -24,6 +24,7 @@
#include <grub/err.h>
#include <grub/emu/misc.h>
#include <grub/emu/hostdisk.h>
+#include <grub/emu/getroot.h>
#include <grub/misc.h>
#include <grub/i18n.h>
#include <grub/list.h>
@@ -331,18 +332,23 @@
return GRUB_ERR_NONE;
}
+int
+grub_util_device_is_mapped (const char *dev)
+{
#ifdef HAVE_DEVICE_MAPPER
-static int
-device_is_mapped (const char *dev)
-{
struct stat st;
+ if (!grub_device_mapper_supported ())
+ return 0;
+
if (stat (dev, &st) < 0)
return 0;
return dm_is_dm_major (major (st.st_rdev));
+#else
+ return 0;
+#endif /* HAVE_DEVICE_MAPPER */
}
-#endif /* HAVE_DEVICE_MAPPER */
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
/* FIXME: geom actually gives us the whole container hierarchy.
@@ -418,7 +424,7 @@
# endif /* !defined(HAVE_DIOCGDINFO) */
# ifdef HAVE_DEVICE_MAPPER
- if (grub_device_mapper_supported () && device_is_mapped (dev)) {
+ if (grub_util_device_is_mapped (dev)) {
struct dm_task *task = NULL;
grub_uint64_t start, length;
char *target_type, *params, *space;
@@ -1149,6 +1155,54 @@
return ret;
}
+#ifdef HAVE_DEVICE_MAPPER
+static int
+grub_util_get_dm_node_linear_info (const char *dev,
+ int *maj, int *min)
+{
+ struct dm_task *dmt;
+ void *next = NULL;
+ uint64_t length, start;
+ char *target, *params;
+ char *ptr;
+ int major, minor;
+
+ dmt = dm_task_create(DM_DEVICE_TABLE);
+ if (!dmt)
+ return 0;
+
+ if (!dm_task_set_name(dmt, dev))
+ return 0;
+ dm_task_no_open_count(dmt);
+ if (!dm_task_run(dmt))
+ return 0;
+ next = dm_get_next_target(dmt, next, &start, &length,
+ &target, &params);
+ if (grub_strcmp (target, "linear") != 0)
+ return 0;
+ major = grub_strtoul (params, &ptr, 10);
+ if (grub_errno)
+ {
+ grub_errno = GRUB_ERR_NONE;
+ return 0;
+ }
+ if (*ptr != ':')
+ return 0;
+ ptr++;
+ minor = grub_strtoul (ptr, 0, 10);
+ if (grub_errno)
+ {
+ grub_errno = GRUB_ERR_NONE;
+ return 0;
+ }
+ if (maj)
+ *maj = major;
+ if (min)
+ *min = minor;
+ return 1;
+}
+#endif
+
static char *
convert_system_partition_to_system_disk (const char *os_dev, struct stat *st)
{
@@ -1325,9 +1379,39 @@
node = NULL;
goto devmapper_out;
}
- else if (strncmp (node_uuid, "DMRAID-", 7) != 0)
- {
+ if (strncmp (node_uuid, "LVM-", 4) == 0)
+ {
+ grub_dprintf ("hostdisk", "%s is an LVM\n", path);
+ node = NULL;
+ goto devmapper_out;
+ }
+ if (strncmp (node_uuid, "mpath-", 6) == 0)
+ {
+ /* Multipath partitions have partN-mpath-* UUIDs, and are
+ linear mappings so are handled by
+ grub_util_get_dm_node_linear_info. Multipath disks are not
+ linear mappings and must be handled specially. */
+ grub_dprintf ("hostdisk", "%s is a multipath disk\n", path);
+ mapper_name = dm_tree_node_get_name (node);
+ goto devmapper_out;
+ }
+ if (strncmp (node_uuid, "DMRAID-", 7) != 0)
+ {
+ int major, minor;
+ const char *node_name;
grub_dprintf ("hostdisk", "%s is not DM-RAID\n", path);
+
+ if ((node_name = dm_tree_node_get_name (node))
+ && grub_util_get_dm_node_linear_info (node_name,
+ &major, &minor))
+ {
+ if (tree)
+ dm_tree_free (tree);
+ free (path);
+ char *ret = grub_find_device (NULL, (major << 8) | minor);
+ return ret;
+ }
+
node = NULL;
goto devmapper_out;
}
=== modified file 'include/grub/emu/misc.h'
--- a/include/grub/emu/misc.h 2010-12-02 13:26:46 +0000
+++ b/include/grub/emu/misc.h 2011-05-18 07:35:47 +0000
@@ -54,6 +54,8 @@
char *grub_make_system_path_relative_to_its_root (const char *path)
__attribute__ ((warn_unused_result));
+int
+grub_util_device_is_mapped (const char *dev);
void * EXPORT_FUNC(xmalloc) (grub_size_t size) __attribute__ ((warn_unused_result));
void * EXPORT_FUNC(xrealloc) (void *ptr, grub_size_t size) __attribute__ ((warn_unused_result));
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