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blkcg: kill blkio_policy_node

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Now that blkcg configuration lives in blkg's, blkio_policy_node is no
longer necessary.  Kill it.

blkio_policy_parse_and_set() now fails if invoked for missing device
and functions to print out configurations are updated to print from
blkg's.

cftype_blkg_same_policy() is dropped along with other policy functions
for consistency.  Its one line is open coded in the only user -
blkio_read_blkg_stats().

-v2: Update to reflect the retry-on-bypass logic change of the
     previous patch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2012-03-05 13:15:08 -08:00
committed by Jens Axboe
parent e56da7e287
commit 4bfd482e73
2 changed files with 59 additions and 410 deletions
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block/blk-cgroup.c
+59 -378
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File diff suppressed because it is too large Load Diff
block/blk-cgroup.h
-32
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@@ -112,7 +112,6 @@ struct blkio_cgroup {
unsigned int weight;
spinlock_t lock;
struct hlist_head blkg_list;
struct list_head policy_list; /* list of blkio_policy_node */
};
struct blkio_group_stats {
@@ -182,37 +181,6 @@ struct blkio_group {
struct blkio_group_stats_cpu __percpu *stats_cpu;
};
struct blkio_policy_node {
struct list_head node;
dev_t dev;
/* This node belongs to max bw policy or porportional weight policy */
enum blkio_policy_id plid;
/* cgroup file to which this rule belongs to */
int fileid;
union {
unsigned int weight;
/*
* Rate read/write in terms of bytes per second
* Whether this rate represents read or write is determined
* by file type "fileid".
*/
u64 bps;
unsigned int iops;
} val;
};
extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
dev_t dev);
extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
dev_t dev);
extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
dev_t dev);
extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg,
dev_t dev);
extern unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg,
dev_t dev);
typedef struct blkio_group *(blkio_alloc_group_fn)(struct request_queue *q,
struct blkio_cgroup *blkcg);
typedef void (blkio_link_group_fn)(struct request_queue *q,