kernfs: fix kernfs_node_from_dentry()

Currently kernfs_node_from_dentry() returns NULL for root dentry,
because root_dentry->d_op == NULL.

Due to this bug cgroupstats_build() returns -EINVAL for root cgroup.

  # mount -t cgroup -o cpuacct /cgroup
  # Documentation/accounting/getdelays -C /cgroup
  fatal reply error,  errno -22

With this fix:

  # Documentation/accounting/getdelays -C /cgroup
  sleeping 305, blocked 0, running 1, stopped 0, uninterruptible 1

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 3 insertions, 2 deletions

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index a0f99b7f84b2..8245d3b34894 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -500,7 +500,7 @@ const struct dentry_operations kernfs_dops = {
  */
 struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry)
 {
-        if (dentry->d_op == &kernfs_dops)
+        if (dentry->d_sb->s_op == &kernfs_sops)
                 return dentry->d_fsdata;
         return NULL;
 }
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index a91d7a1113d9..8be13b2a079b 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -65,6 +65,7 @@ struct kernfs_super_info {
 };
 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
 
+extern const struct super_operations kernfs_sops;
 extern struct kmem_cache *kernfs_node_cache;
 
 /*
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index e5b28b0ebc37..405279b5517b 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -39,7 +39,7 @@ static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry)
         return 0;
 }
 
-static const struct super_operations kernfs_sops = {
+const struct super_operations kernfs_sops = {
         .statfs         = simple_statfs,
         .drop_inode     = generic_delete_inode,
         .evict_inode    = kernfs_evict_inode,