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| author | Tejun Heo <tj@kernel.org> | 2012-03-05 21:15:04 (GMT) |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-03-06 20:27:22 (GMT) |
| commit | 035d10b2fa7e5f7e9bf9465dbc39c35affd5ac32 (patch) | |
| tree | 6a712eb1b505e8163d28f8709980e581a08b572c /block/blk-cgroup.c | |
| parent | ca32aefc7f2539ed88d42763330d54ee3e61769a (diff) | |
| download | linux-fsl-qoriq-035d10b2fa7e5f7e9bf9465dbc39c35affd5ac32.tar.xz | |
blkcg: add blkio_policy[] array and allow one policy per policy ID
Block cgroup policies are maintained in a linked list and,
theoretically, multiple policies sharing the same policy ID are
allowed.
This patch temporarily restricts one policy per plid and adds
blkio_policy[] array which indexes registered policy types by plid.
Both the restriction and blkio_policy[] array are transitional and
will be removed once API cleanup is complete.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 5e50ca1..f1b08d3c 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -29,6 +29,8 @@ static LIST_HEAD(blkio_list); struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; EXPORT_SYMBOL_GPL(blkio_root_cgroup); +static struct blkio_policy_type *blkio_policy[BLKIO_NR_POLICIES]; + static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *, struct cgroup *); static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *, @@ -1694,7 +1696,11 @@ static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, void blkio_policy_register(struct blkio_policy_type *blkiop) { spin_lock(&blkio_list_lock); + + BUG_ON(blkio_policy[blkiop->plid]); + blkio_policy[blkiop->plid] = blkiop; list_add_tail(&blkiop->list, &blkio_list); + spin_unlock(&blkio_list_lock); } EXPORT_SYMBOL_GPL(blkio_policy_register); @@ -1702,7 +1708,11 @@ EXPORT_SYMBOL_GPL(blkio_policy_register); void blkio_policy_unregister(struct blkio_policy_type *blkiop) { spin_lock(&blkio_list_lock); + + BUG_ON(blkio_policy[blkiop->plid] != blkiop); + blkio_policy[blkiop->plid] = NULL; list_del_init(&blkiop->list); + spin_unlock(&blkio_list_lock); } EXPORT_SYMBOL_GPL(blkio_policy_unregister); |