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Commit c39a90b1 authored by Tejun Heo's avatar Tejun Heo Committed by Greg Kroah-Hartman
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cgroup, blkcg: Prepare some symbols for module and !CONFIG_CGROUP usages 



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: default avatarkbuild test robot <lkp@intel.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 37d0897f

fs/fs-writeback.c

+1 −0
Original line number Diff line number Diff line
@@ -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