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authorTejun Heo <tj@kernel.org>2015-08-18 14:55:16 -0700
committerJens Axboe <axboe@fb.com>2015-08-18 15:49:17 -0700
commite4a9bde9589fdc51283755cdd75d47b27ca7c6fb (patch)
treecc26b9cdba09e6571342f16182cafee5e82852b0 /block/cfq-iosched.c
parent814376483e7d85b69a70634633f1f9d01c6ee0cf (diff)
blkcg: replace blkcg_policy->cpd_size with ->cpd_alloc/free_fn() methods
Each active policy has a cpd (blkcg_policy_data) on each blkcg. The cpd's were allocated by blkcg core and each policy could request to allocate extra space at the end by setting blkcg_policy->cpd_size larger than the size of cpd. This is a bit unusual but blkg (blkcg_gq) policy data used to be handled this way too so it made sense to be consistent; however, blkg policy data switched to alloc/free callbacks. This patch makes similar changes to cpd handling. blkcg_policy->cpd_alloc/free_fn() are added to replace ->cpd_size. As cpd allocation is now done from policy side, it can simply allocate a larger area which embeds cpd at the beginning. As ->cpd_alloc_fn() may be able to perform all necessary initializations, this patch makes ->cpd_init_fn() optional. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Arianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index dd6ea9ee6245..a4429b366820 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1568,6 +1568,16 @@ static void cfqg_stats_init(struct cfqg_stats *stats)
#endif
}
+static struct blkcg_policy_data *cfq_cpd_alloc(gfp_t gfp)
+{
+ struct cfq_group_data *cgd;
+
+ cgd = kzalloc(sizeof(*cgd), GFP_KERNEL);
+ if (!cgd)
+ return NULL;
+ return &cgd->cpd;
+}
+
static void cfq_cpd_init(struct blkcg_policy_data *cpd)
{
struct cfq_group_data *cgd = cpd_to_cfqgd(cpd);
@@ -1581,6 +1591,11 @@ static void cfq_cpd_init(struct blkcg_policy_data *cpd)
}
}
+static void cfq_cpd_free(struct blkcg_policy_data *cpd)
+{
+ kfree(cpd_to_cfqgd(cpd));
+}
+
static struct blkg_policy_data *cfq_pd_alloc(gfp_t gfp, int node)
{
struct cfq_group *cfqg;
@@ -4649,10 +4664,12 @@ static struct elevator_type iosched_cfq = {
#ifdef CONFIG_CFQ_GROUP_IOSCHED
static struct blkcg_policy blkcg_policy_cfq = {
- .cpd_size = sizeof(struct cfq_group_data),
.cftypes = cfq_blkcg_files,
+ .cpd_alloc_fn = cfq_cpd_alloc,
.cpd_init_fn = cfq_cpd_init,
+ .cpd_free_fn = cfq_cpd_free,
+
.pd_alloc_fn = cfq_pd_alloc,
.pd_init_fn = cfq_pd_init,
.pd_offline_fn = cfq_pd_offline,