Display all possible partitions when the root filesystem failed to mount

[sfrench/cifs-2.6.git] / block / genhd.c

diff --git a/block/genhd.c b/block/genhd.c
index 457fdac4c17d98db97cebd0c6910e23f4f97399f..93a2cf654597c25502da7fb128745c11c01581c9 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -5,6 +5,7 @@
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/genhd.h>
+#include <linux/kdev_t.h>
 #include <linux/kernel.h>
 #include <linux/blkdev.h>
 #include <linux/init.h>
@@ -16,7 +17,7 @@
 #include <linux/buffer_head.h>
 #include <linux/mutex.h>
 
-struct subsystem block_subsys;
+struct kset block_subsys;
 static DEFINE_MUTEX(block_subsys_lock);
 
 /*
@@ -212,6 +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)
@@ -220,7 +274,7 @@ static void *part_start(struct seq_file *part, loff_t *pos)
        loff_t l = *pos;
 
        mutex_lock(&block_subsys_lock);
-       list_for_each(p, &block_subsys.kset.list)
+       list_for_each(p, &block_subsys.list)
                if (!l--)
                        return list_entry(p, struct gendisk, kobj.entry);
        return NULL;
@@ -230,7 +284,7 @@ static void *part_next(struct seq_file *part, void *v, loff_t *pos)
 {
        struct list_head *p = ((struct gendisk *)v)->kobj.entry.next;
        ++*pos;
-       return p==&block_subsys.kset.list ? NULL : 
+       return p==&block_subsys.list ? NULL :
                list_entry(p, struct gendisk, kobj.entry);
 }
 
@@ -245,7 +299,7 @@ static int show_partition(struct seq_file *part, void *v)
        int n;
        char buf[BDEVNAME_SIZE];
 
-       if (&sgp->kobj.entry == block_subsys.kset.list.next)
+       if (&sgp->kobj.entry == block_subsys.list.next)
                seq_puts(part, "major minor  #blocks  name\n\n");
 
        /* Don't show non-partitionable removeable devices or empty devices */
@@ -564,7 +618,7 @@ static void *diskstats_start(struct seq_file *part, loff_t *pos)
        struct list_head *p;
 
        mutex_lock(&block_subsys_lock);
-       list_for_each(p, &block_subsys.kset.list)
+       list_for_each(p, &block_subsys.list)
                if (!k--)
                        return list_entry(p, struct gendisk, kobj.entry);
        return NULL;
@@ -574,7 +628,7 @@ static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos)
 {
        struct list_head *p = ((struct gendisk *)v)->kobj.entry.next;
        ++*pos;
-       return p==&block_subsys.kset.list ? NULL :
+       return p==&block_subsys.list ? NULL :
                list_entry(p, struct gendisk, kobj.entry);
 }