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cgroup, blkcg: Prepare some symbols for module and !CONFIG_CGROUP usages

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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>
This commit is contained in:
Tejun Heo 2019-06-27 13:39:48 -07:00 • committed by Greg Kroah-Hartman
parent 55753eb667
commit f510fa515d
1 changed files with 1 additions and 0 deletions
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fs/fs-writeback.c
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@ -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