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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 0f5d54e9f2d..cc849d9c94c 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);
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