A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 18:51:56 -04:00
Code Issues Projects Releases Packages Wiki Activity

blkcg: replace blkcg_policy->cpd_size with ->cpd_alloc/free_fn() methods

Browse source 
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 <[email protected]>
Cc: Vivek Goyal <[email protected]>
Cc: Arianna Avanzini <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2015-08-18 14:55:16 -07:00 • committed by Jens Axboe
commit e4a9bde958
3 changed files with 52 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

39
block/blk-cgroup.c
View file

@ -817,11 +817,15 @@ static void blkcg_css_free(struct cgroup_subsys_state *css)
int i;
mutex_lock(&blkcg_pol_mutex);
list_del(&blkcg->all_blkcgs_node);
mutex_unlock(&blkcg_pol_mutex);
for (i = 0; i < BLKCG_MAX_POLS; i++)
kfree(blkcg->cpd[i]);
if (blkcg->cpd[i])
blkcg_policy[i]->cpd_free_fn(blkcg->cpd[i]);
mutex_unlock(&blkcg_pol_mutex);
kfree(blkcg);
}
@ -854,11 +858,10 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
* check if the policy requires any specific per-cgroup
* data: if it does, allocate and initialize it.
*/
if (!pol || !pol->cpd_size)
if (!pol || !pol->cpd_alloc_fn)
continue;
BUG_ON(blkcg->cpd[i]);
cpd = kzalloc(pol->cpd_size, GFP_KERNEL);
cpd = pol->cpd_alloc_fn(GFP_KERNEL);
if (!cpd) {
ret = ERR_PTR(-ENOMEM);
goto free_pd_blkcg;
@ -866,7 +869,8 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
blkcg->cpd[i] = cpd;
cpd->blkcg = blkcg;
cpd->plid = i;
pol->cpd_init_fn(cpd);
if (pol->cpd_init_fn)
pol->cpd_init_fn(cpd);
}
spin_lock_init(&blkcg->lock);
@ -882,7 +886,8 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
free_pd_blkcg:
for (i--; i >= 0; i--)
kfree(blkcg->cpd[i]);
if (blkcg->cpd[i])
blkcg_policy[i]->cpd_free_fn(blkcg->cpd[i]);
free_blkcg:
kfree(blkcg);
mutex_unlock(&blkcg_pol_mutex);
@ -1159,11 +1164,11 @@ int blkcg_policy_register(struct blkcg_policy *pol)
blkcg_policy[pol->plid] = pol;
/* allocate and install cpd's */
if (pol->cpd_size) {
if (pol->cpd_alloc_fn) {
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {
struct blkcg_policy_data *cpd;
cpd = kzalloc(pol->cpd_size, GFP_KERNEL);
cpd = pol->cpd_alloc_fn(GFP_KERNEL);
if (!cpd) {
mutex_unlock(&blkcg_pol_mutex);
goto err_free_cpds;
@ -1186,10 +1191,12 @@ int blkcg_policy_register(struct blkcg_policy *pol)
return 0;
err_free_cpds:
if (pol->cpd_size) {
if (pol->cpd_alloc_fn) {
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {
kfree(blkcg->cpd[pol->plid]);
blkcg->cpd[pol->plid] = NULL;
if (blkcg->cpd[pol->plid]) {
pol->cpd_free_fn(blkcg->cpd[pol->plid]);
blkcg->cpd[pol->plid] = NULL;
}
}
}
blkcg_policy[pol->plid] = NULL;
@ -1222,10 +1229,12 @@ void blkcg_policy_unregister(struct blkcg_policy *pol)
/* remove cpds and unregister */
mutex_lock(&blkcg_pol_mutex);
if (pol->cpd_size) {
if (pol->cpd_alloc_fn) {
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {
kfree(blkcg->cpd[pol->plid]);
blkcg->cpd[pol->plid] = NULL;
if (blkcg->cpd[pol->plid]) {
pol->cpd_free_fn(blkcg->cpd[pol->plid]);
blkcg->cpd[pol->plid] = NULL;
}
}
}
blkcg_policy[pol->plid] = NULL;