From: Tejun Heo tj@kernel.org
commit 9b0eb69b75bccada2d341d7e7ca342f0cb1c9a6a upstream.
btrfs is going to use css_put() and wbc helpers to improve cgroup writeback support. Add dummy css_get() definition and export wbc helpers to prepare for module and !CONFIG_CGROUP builds.
[only backport the export of __inode_attach_wb for stable kernels - gregkh]
Reported-by: kbuild test robot lkp@intel.com Reviewed-by: Jan Kara jack@suse.cz Signed-off-by: Tejun Heo tj@kernel.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- fs/fs-writeback.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 027e50419f17..fe1604ad9023 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -269,6 +269,7 @@ void __inode_attach_wb(struct inode *inode, struct page *page) if (unlikely(cmpxchg(&inode->i_wb, NULL, wb))) wb_put(wb); } +EXPORT_SYMBOL_GPL(__inode_attach_wb);
/** * locked_inode_to_wb_and_lock_list - determine a locked inode's wb and lock it