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| author | Vivek Goyal <vgoyal@redhat.com> | 2009-12-04 10:36:41 -0500 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-12-04 16:38:14 +0100 |
| commit | 9d6a986c0b276085f7944cd8ad65f4f82aff7536 (patch) | |
| tree | 1e72c813f4346ee329d5d427e214d183af78934f /block/blk-cgroup.c | |
| parent | b69f2292063d2caf37ca9aec7d63ded203701bf3 (diff) | |
| download | lwn-9d6a986c0b276085f7944cd8ad65f4f82aff7536.tar.gz lwn-9d6a986c0b276085f7944cd8ad65f4f82aff7536.zip | |
blkio: Export some symbols from blkio as its user CFQ can be a module
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>
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 73a5525cc0a2..4d4a277b2905 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -13,16 +13,33 @@ #include <linux/ioprio.h> #include <linux/seq_file.h> #include <linux/kdev_t.h> +#include <linux/module.h> #include "blk-cgroup.h" #include "cfq-iosched.h" struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; +EXPORT_SYMBOL_GPL(blkio_root_cgroup); + +bool blkiocg_css_tryget(struct blkio_cgroup *blkcg) +{ + if (!css_tryget(&blkcg->css)) + return false; + return true; +} +EXPORT_SYMBOL_GPL(blkiocg_css_tryget); + +void blkiocg_css_put(struct blkio_cgroup *blkcg) +{ + css_put(&blkcg->css); +} +EXPORT_SYMBOL_GPL(blkiocg_css_put); struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), struct blkio_cgroup, css); } +EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, unsigned long time, unsigned long sectors) @@ -30,6 +47,7 @@ void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, blkg->time += time; blkg->sectors += sectors; } +EXPORT_SYMBOL_GPL(blkiocg_update_blkio_group_stats); void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, struct blkio_group *blkg, void *key, dev_t dev) @@ -47,6 +65,7 @@ void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, #endif blkg->dev = dev; } +EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group); static void __blkiocg_del_blkio_group(struct blkio_group *blkg) { @@ -81,6 +100,7 @@ out: rcu_read_unlock(); return ret; } +EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); /* called under rcu_read_lock(). */ struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) @@ -97,6 +117,7 @@ struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) return NULL; } +EXPORT_SYMBOL_GPL(blkiocg_lookup_group); #define SHOW_FUNCTION(__VAR) \ static u64 blkiocg_##__VAR##_read(struct cgroup *cgroup, \ @@ -166,6 +187,7 @@ void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg, { blkg->dequeue += dequeue; } +EXPORT_SYMBOL_GPL(blkiocg_update_blkio_group_dequeue_stats); #endif struct cftype blkio_files[] = { |