GFS2: Add sysfs link to device

This adds a link from the per-gfs2 sb sysfs directory to
the block device upon which the filesystem is mounted. The
link is called "device", strangely enough :-)

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index dda4bf1e9eb4..0d4f7e974e9f 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -16,6 +16,7 @@
 #include <linux/kobject.h>
 #include <asm/uaccess.h>
 #include <linux/gfs2_ondisk.h>
+#include <linux/genhd.h>
 
 #include "gfs2.h"
 #include "incore.h"
@@ -542,9 +543,17 @@ int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
         if (error)
                 goto fail_tune;
 
+        error = sysfs_create_link(&sdp->sd_kobj,
+                                  &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
+                                  "device");
+        if (error)
+                goto fail_lock_module;
+
         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
         return 0;
 
+fail_lock_module:
+        sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 fail_tune:
         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 fail_reg:
@@ -556,6 +565,7 @@ fail:
 
 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 {
+        sysfs_remove_link(&sdp->sd_kobj, "device");
         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
         kobject_put(&sdp->sd_kobj);