Blame SOURCES/0327-ieee1275-powerpc-enables-device-mapper-discovery.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Diego Domingos <diegodo@br.ibm.com>
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Date: Mon, 14 Dec 2020 17:47:16 +0100
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Subject: [PATCH] ieee1275/powerpc: enables device mapper discovery
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this patch enables the device mapper discovery on ofpath.c. Currently,
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when we are dealing with a device like /dev/dm-* the ofpath returns null
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since there is no function implemented to handle this case.
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This patch implements a function that will look into /sys/block/dm-*
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devices and search recursively inside slaves directory to find the root
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disk.
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Signed-off-by: Diego Domingos <diegodo@br.ibm.com>
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---
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 grub-core/osdep/linux/ofpath.c | 64 +++++++++++++++++++++++++++++++++++++++++-
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 1 file changed, 63 insertions(+), 1 deletion(-)
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diff --git a/grub-core/osdep/linux/ofpath.c b/grub-core/osdep/linux/ofpath.c
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index 0f5d54e9f..cc849d9c9 100644
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--- a/grub-core/osdep/linux/ofpath.c
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+++ b/grub-core/osdep/linux/ofpath.c
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@@ -37,6 +37,7 @@
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 #include <fcntl.h>
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 #include <errno.h>
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 #include <ctype.h>
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+#include <dirent.h>
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 #ifdef __sparc__
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 typedef enum
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@@ -755,13 +756,74 @@ strip_trailing_digits (const char *p)
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   return new;
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 }
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+static char *
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+get_slave_from_dm(const char * device){
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+  char *curr_device, *tmp;
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+  char *directory;
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+  char *ret = NULL;
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+
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+  directory = grub_strdup (device);
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+  tmp = get_basename(directory);
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+  curr_device = grub_strdup (tmp);
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+  *tmp = '\0';
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+
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+  /* Recursively check for slaves devices so we can find the root device */
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+  while ((curr_device[0] == 'd') && (curr_device[1] == 'm') && (curr_device[2] == '-')){
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+    DIR *dp;
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+    struct dirent *ep;
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+    char* device_path;
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+
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+    device_path = grub_xasprintf ("/sys/block/%s/slaves", curr_device);
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+    dp = opendir(device_path);
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+    free(device_path);
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+
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+    if (dp != NULL)
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+    {
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+      ep = readdir (dp);
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+      while (ep != NULL){
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+
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+	/* avoid some system directories */
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+        if (!strcmp(ep->d_name,"."))
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+            goto next_dir;
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+        if (!strcmp(ep->d_name,".."))
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+            goto next_dir;
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+
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+	free (curr_device);
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+	free (ret);
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+	curr_device = grub_strdup (ep->d_name);
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+	ret = grub_xasprintf ("%s%s", directory, curr_device);
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+	break;
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+
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+        next_dir:
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+         ep = readdir (dp);
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+         continue;
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+      }
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+      closedir (dp);
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+    }
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+    else
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+      grub_util_warn (_("cannot open directory `%s'"), device_path);
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+  }
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+
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+  free (directory);
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+  free (curr_device);
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+
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+  return ret;
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+}
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+
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 char *
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 grub_util_devname_to_ofpath (const char *sys_devname)
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 {
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-  char *name_buf, *device, *devnode, *devicenode, *ofpath;
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+  char *name_buf, *device, *devnode, *devicenode, *ofpath, *realname;
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   name_buf = xrealpath (sys_devname);
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+  realname = get_slave_from_dm (name_buf);
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+  if (realname)
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+    {
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+      free (name_buf);
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+      name_buf = realname;
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+    }
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+
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   device = get_basename (name_buf);
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   devnode = strip_trailing_digits (name_buf);
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   devicenode = strip_trailing_digits (device);