1 files changed, 53 insertions, 0 deletions

diff --git a/block/genhd.c b/block/genhd.c
index b5664440896c..93a2cf654597 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -213,6 +213,59 @@ struct gendisk *get_gendisk(dev_t dev, int *part)
         return  kobj ? to_disk(kobj) : NULL;
 }
 
+/*
+ * print a full list of all partitions - intended for places where the root
+ * filesystem can't be mounted and thus to give the victim some idea of what
+ * went wrong
+ */
+void __init printk_all_partitions(void)
+{
+        int n;
+        struct gendisk *sgp;
+
+        mutex_lock(&block_subsys_lock);
+        /* For each block device... */
+        list_for_each_entry(sgp, &block_subsys.list, kobj.entry) {
+                char buf[BDEVNAME_SIZE];
+                /*
+                 * Don't show empty devices or things that have been surpressed
+                 */
+                if (get_capacity(sgp) == 0 ||
+                    (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
+                        continue;
+
+                /*
+                 * Note, unlike /proc/partitions, I am showing the numbers in
+                 * hex - the same format as the root= option takes.
+                 */
+                printk("%02x%02x %10llu %s",
+                        sgp->major, sgp->first_minor,
+                        (unsigned long long)get_capacity(sgp) >> 1,
+                        disk_name(sgp, 0, buf));
+                if (sgp->driverfs_dev != NULL &&
+                    sgp->driverfs_dev->driver != NULL)
+                        printk(" driver: %s\n",
+                                sgp->driverfs_dev->driver->name);
+                else
+                        printk(" (driver?)\n");
+
+                /* now show the partitions */
+                for (n = 0; n < sgp->minors - 1; ++n) {
+                        if (sgp->part[n] == NULL)
+                                continue;
+                        if (sgp->part[n]->nr_sects == 0)
+                                continue;
+                        printk("  %02x%02x %10llu %s\n",
+                                sgp->major, n + 1 + sgp->first_minor,
+                                (unsigned long long)sgp->part[n]->nr_sects >> 1,
+                                disk_name(sgp, n + 1, buf));
+                } /* partition subloop */
+        } /* Block device loop */
+
+        mutex_unlock(&block_subsys_lock);
+        return;
+}
+
 #ifdef CONFIG_PROC_FS
 /* iterator */
 static void *part_start(struct seq_file *part, loff_t *pos)