pstore: Create a convenient mount point for pstore

Using /dev/pstore as a mount point for the pstore filesystem is slightly
awkward.  We don't normally mount filesystems in /dev/ and the /dev/pstore
file isn't created automatically by anything.  While this method will
still work, we can create a persistent mount point in sysfs.  This will
put pstore on par with things like cgroups and efivarfs.

Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 67de74ca85f4..e4bcb2cf055a 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -418,9 +418,25 @@ static struct file_system_type pstore_fs_type = {
         .kill_sb        = pstore_kill_sb,
 };
 
+static struct kobject *pstore_kobj;
+
 static int __init init_pstore_fs(void)
 {
-        return register_filesystem(&pstore_fs_type);
+        int err = 0;
+
+        /* Create a convenient mount point for people to access pstore */
+        pstore_kobj = kobject_create_and_add("pstore", fs_kobj);
+        if (!pstore_kobj) {
+                err = -ENOMEM;
+                goto out;
+        }
+
+        err = register_filesystem(&pstore_fs_type);
+        if (err < 0)
+                kobject_put(pstore_kobj);
+
+out:
+        return err;
 }
 module_init(init_pstore_fs)