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blkcg: use q and plid instead of opaque void * for blkio_group association

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blkgio_group is association between a block cgroup and a queue for a
given policy.  Using opaque void * for association makes things
confusing and hinders factoring of common code.  Use request_queue *
and, if necessary, policy id instead.

This will help block cgroup API cleanup.

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 13:15:03 -08:00
committed by Jens Axboe
parent 0a5a7d0e32
commit ca32aefc7f
5 changed files with 70 additions and 71 deletions
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block/blk-throttle.c
+23 -27
View File
@@ -252,7 +252,7 @@ static void throtl_init_add_tg_lists(struct throtl_data *td,
__throtl_tg_fill_dev_details(td, tg);
/* Add group onto cgroup list */
blkiocg_add_blkio_group(blkcg, &tg->blkg, (void *)td,
blkiocg_add_blkio_group(blkcg, &tg->blkg, td->queue,
tg->blkg.dev, BLKIO_POLICY_THROTL);
tg->bps[READ] = blkcg_get_read_bps(blkcg, tg->blkg.dev);
@@ -288,7 +288,6 @@ static struct
throtl_grp *throtl_find_tg(struct throtl_data *td, struct blkio_cgroup *blkcg)
{
struct throtl_grp *tg = NULL;
void *key = td;
/*
* This is the common case when there are no blkio cgroups.
@@ -297,7 +296,8 @@ throtl_grp *throtl_find_tg(struct throtl_data *td, struct blkio_cgroup *blkcg)
if (blkcg == &blkio_root_cgroup)
tg = td->root_tg;
else
tg = tg_of_blkg(blkiocg_lookup_group(blkcg, key));
tg = tg_of_blkg(blkiocg_lookup_group(blkcg, td->queue,
BLKIO_POLICY_THROTL));
__throtl_tg_fill_dev_details(td, tg);
return tg;
@@ -1012,22 +1012,22 @@ static bool throtl_release_tgs(struct throtl_data *td, bool release_root)
* no new IO will come in this group. So get rid of this group as soon as
* any pending IO in the group is finished.
*
* This function is called under rcu_read_lock(). key is the rcu protected
* pointer. That means "key" is a valid throtl_data pointer as long as we are
* rcu read lock.
* This function is called under rcu_read_lock(). @q is the rcu protected
* pointer. That means @q is a valid request_queue pointer as long as we
* are rcu read lock.
*
* "key" was fetched from blkio_group under blkio_cgroup->lock. That means
* @q was fetched from blkio_group under blkio_cgroup->lock. That means
* it should not be NULL as even if queue was going away, cgroup deltion
* path got to it first.
*/
void throtl_unlink_blkio_group(void *key, struct blkio_group *blkg)
void throtl_unlink_blkio_group(struct request_queue *q,
struct blkio_group *blkg)
{
unsigned long flags;
struct throtl_data *td = key;
spin_lock_irqsave(td->queue->queue_lock, flags);
throtl_destroy_tg(td, tg_of_blkg(blkg));
spin_unlock_irqrestore(td->queue->queue_lock, flags);
spin_lock_irqsave(q->queue_lock, flags);
throtl_destroy_tg(q->td, tg_of_blkg(blkg));
spin_unlock_irqrestore(q->queue_lock, flags);
}
static bool throtl_clear_queue(struct request_queue *q)
@@ -1054,52 +1054,48 @@ static void throtl_update_blkio_group_common(struct throtl_data *td,
}
/*
* For all update functions, key should be a valid pointer because these
* For all update functions, @q should be a valid pointer because these
* update functions are called under blkcg_lock, that means, blkg is
* valid and in turn key is valid. queue exit path can not race because
* valid and in turn @q is valid. queue exit path can not race because
* of blkcg_lock
*
* Can not take queue lock in update functions as queue lock under blkcg_lock
* is not allowed. Under other paths we take blkcg_lock under queue_lock.
*/
static void throtl_update_blkio_group_read_bps(void *key,
static void throtl_update_blkio_group_read_bps(struct request_queue *q,
struct blkio_group *blkg, u64 read_bps)
{
struct throtl_data *td = key;
struct throtl_grp *tg = tg_of_blkg(blkg);
tg->bps[READ] = read_bps;
throtl_update_blkio_group_common(td, tg);
throtl_update_blkio_group_common(q->td, tg);
}
static void throtl_update_blkio_group_write_bps(void *key,
static void throtl_update_blkio_group_write_bps(struct request_queue *q,
struct blkio_group *blkg, u64 write_bps)
{
struct throtl_data *td = key;
struct throtl_grp *tg = tg_of_blkg(blkg);
tg->bps[WRITE] = write_bps;
throtl_update_blkio_group_common(td, tg);
throtl_update_blkio_group_common(q->td, tg);
}
static void throtl_update_blkio_group_read_iops(void *key,
static void throtl_update_blkio_group_read_iops(struct request_queue *q,
struct blkio_group *blkg, unsigned int read_iops)
{
struct throtl_data *td = key;
struct throtl_grp *tg = tg_of_blkg(blkg);
tg->iops[READ] = read_iops;
throtl_update_blkio_group_common(td, tg);
throtl_update_blkio_group_common(q->td, tg);
}
static void throtl_update_blkio_group_write_iops(void *key,
static void throtl_update_blkio_group_write_iops(struct request_queue *q,
struct blkio_group *blkg, unsigned int write_iops)
{
struct throtl_data *td = key;
struct throtl_grp *tg = tg_of_blkg(blkg);
tg->iops[WRITE] = write_iops;
throtl_update_blkio_group_common(td, tg);
throtl_update_blkio_group_common(q->td, tg);
}
static void throtl_shutdown_wq(struct request_queue *q)
@@ -1306,7 +1302,7 @@ void blk_throtl_exit(struct request_queue *q)
spin_unlock_irq(q->queue_lock);
/*
* Wait for tg->blkg->key accessors to exit their grace periods.
* Wait for tg->blkg->q accessors to exit their grace periods.
* Do this wait only if there are other undestroyed groups out
* there (other than root group). This can happen if cgroup deletion
* path claimed the responsibility of cleaning up a group before