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blkio: Export some symbols from blkio as its user CFQ can be a module

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o blkio controller is inside the kernel and cfq makes use of interfaces
  exported by blkio. CFQ can be a module too, hence export symbols used
  by CFQ.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Vivek Goyal
2009-12-04 10:36:41 -05:00
committed by Jens Axboe
parent b69f229206
commit 9d6a986c0b
3 changed files with 27 additions and 2 deletions
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block/cfq-iosched.c
+2 -2
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@@ -961,7 +961,7 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
unsigned int major, minor;
/* Do we need to take this reference */
if (!css_tryget(&blkcg->css))
if (!blkiocg_css_tryget(blkcg))
return NULL;;
cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key));
@@ -994,7 +994,7 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list);
done:
css_put(&blkcg->css);
blkiocg_css_put(blkcg);
return cfqg;
}