Commit 9b0eb69b authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

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



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.

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>
parent fd112c74

block/blk-cgroup.c

+1 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ struct blkcg blkcg_root; 
EXPORT_SYMBOL_GPL(blkcg_root);



struct cgroup_subsys_state * const blkcg_root_css = &blkcg_root.css;

EXPORT_SYMBOL_GPL(blkcg_root_css);



static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];

fs/fs-writeback.c

+3 −0
Original line number Diff line number Diff line
@@ -270,6 +270,7 @@ 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
@@ -582,6 +583,7 @@ void wbc_attach_and_unlock_inode(struct writeback_control *wbc, 
	if (unlikely(wb_dying(wbc->wb)))

		inode_switch_wbs(inode, wbc->wb_id);

}

EXPORT_SYMBOL_GPL(wbc_attach_and_unlock_inode);



/**

 * wbc_detach_inode - disassociate wbc from inode and perform foreign detection
@@ -701,6 +703,7 @@ void wbc_detach_inode(struct writeback_control *wbc) 
	wb_put(wbc->wb);

	wbc->wb = NULL;

}

EXPORT_SYMBOL_GPL(wbc_detach_inode);



/**

 * wbc_account_io - account IO issued during writeback

include/linux/cgroup.h

+1 −0
Original line number Diff line number Diff line
@@ -699,6 +699,7 @@ void cgroup_path_from_kernfs_id(const union kernfs_node_id *id, 
struct cgroup_subsys_state;

struct cgroup;



static inline void css_get(struct cgroup_subsys_state *css) {}

static inline void css_put(struct cgroup_subsys_state *css) {}

static inline int cgroup_attach_task_all(struct task_struct *from,

					 struct task_struct *t) { return 0; }