mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 17:53:56 +08:00
blkcg: kill blkio_policy_node
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:
parent
e56da7e287
commit
4bfd482e73
@ -59,54 +59,6 @@ struct cgroup_subsys blkio_subsys = {
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};
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EXPORT_SYMBOL_GPL(blkio_subsys);
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static inline void blkio_policy_insert_node(struct blkio_cgroup *blkcg,
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struct blkio_policy_node *pn)
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{
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list_add(&pn->node, &blkcg->policy_list);
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}
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static inline bool cftype_blkg_same_policy(struct cftype *cft,
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struct blkio_group *blkg)
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{
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enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
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if (blkg->plid == plid)
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return 1;
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return 0;
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}
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/* Determines if policy node matches cgroup file being accessed */
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static inline bool pn_matches_cftype(struct cftype *cft,
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struct blkio_policy_node *pn)
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{
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enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
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int fileid = BLKIOFILE_ATTR(cft->private);
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return (plid == pn->plid && fileid == pn->fileid);
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}
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/* Must be called with blkcg->lock held */
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static inline void blkio_policy_delete_node(struct blkio_policy_node *pn)
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{
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list_del(&pn->node);
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}
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/* Must be called with blkcg->lock held */
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static struct blkio_policy_node *
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blkio_policy_search_node(const struct blkio_cgroup *blkcg, dev_t dev,
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enum blkio_policy_id plid, int fileid)
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{
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struct blkio_policy_node *pn;
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list_for_each_entry(pn, &blkcg->policy_list, node) {
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if (pn->dev == dev && pn->plid == plid && pn->fileid == fileid)
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return pn;
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}
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return NULL;
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}
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struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
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{
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return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id),
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@ -854,10 +806,8 @@ static uint64_t blkio_get_stat(struct blkio_group *blkg,
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return disk_total;
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}
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static int blkio_policy_parse_and_set(char *buf,
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struct blkio_policy_node *newpn,
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enum blkio_policy_id plid, int fileid,
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struct blkio_cgroup *blkcg)
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static int blkio_policy_parse_and_set(char *buf, enum blkio_policy_id plid,
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int fileid, struct blkio_cgroup *blkcg)
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{
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struct gendisk *disk = NULL;
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struct blkio_group *blkg = NULL;
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@ -905,78 +855,51 @@ static int blkio_policy_parse_and_set(char *buf,
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if (strict_strtoull(s[1], 10, &temp))
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goto out;
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/* For rule removal, do not check for device presence. */
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disk = get_gendisk(dev, &part);
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if ((!disk || part) && temp) {
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ret = -ENODEV;
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if (!disk || part)
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goto out;
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}
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rcu_read_lock();
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if (disk && !part) {
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spin_lock_irq(disk->queue->queue_lock);
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blkg = blkg_lookup_create(blkcg, disk->queue, plid, false);
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spin_unlock_irq(disk->queue->queue_lock);
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spin_lock_irq(disk->queue->queue_lock);
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blkg = blkg_lookup_create(blkcg, disk->queue, plid, false);
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spin_unlock_irq(disk->queue->queue_lock);
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if (IS_ERR(blkg)) {
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ret = PTR_ERR(blkg);
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if (ret == -EBUSY)
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goto out_unlock;
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blkg = NULL;
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}
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if (IS_ERR(blkg)) {
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ret = PTR_ERR(blkg);
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goto out_unlock;
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}
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newpn->dev = dev;
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switch (plid) {
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case BLKIO_POLICY_PROP:
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if ((temp < BLKIO_WEIGHT_MIN && temp > 0) ||
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temp > BLKIO_WEIGHT_MAX)
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goto out_unlock;
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newpn->plid = plid;
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newpn->fileid = fileid;
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newpn->val.weight = temp;
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if (blkg)
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blkg->conf.weight = temp;
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blkg->conf.weight = temp;
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blkio_update_group_weight(blkg, temp ?: blkcg->weight);
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break;
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case BLKIO_POLICY_THROTL:
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switch(fileid) {
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case BLKIO_THROTL_read_bps_device:
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if (blkg)
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blkg->conf.bps[READ] = temp;
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newpn->plid = plid;
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newpn->fileid = fileid;
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newpn->val.bps = temp;
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blkg->conf.bps[READ] = temp;
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blkio_update_group_bps(blkg, temp ?: -1, fileid);
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break;
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case BLKIO_THROTL_write_bps_device:
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if (blkg)
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blkg->conf.bps[WRITE] = temp;
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newpn->plid = plid;
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newpn->fileid = fileid;
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newpn->val.bps = temp;
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blkg->conf.bps[WRITE] = temp;
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blkio_update_group_bps(blkg, temp ?: -1, fileid);
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break;
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case BLKIO_THROTL_read_iops_device:
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if (temp > THROTL_IOPS_MAX)
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goto out_unlock;
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if (blkg)
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blkg->conf.iops[READ] = temp;
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newpn->plid = plid;
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newpn->fileid = fileid;
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newpn->val.iops = (unsigned int)temp;
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blkg->conf.iops[READ] = temp;
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blkio_update_group_iops(blkg, temp ?: -1, fileid);
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break;
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case BLKIO_THROTL_write_iops_device:
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if (temp > THROTL_IOPS_MAX)
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goto out_unlock;
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if (blkg)
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blkg->conf.iops[WRITE] = temp;
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newpn->plid = plid;
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newpn->fileid = fileid;
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newpn->val.iops = (unsigned int)temp;
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blkg->conf.iops[WRITE] = temp;
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blkio_update_group_iops(blkg, temp ?: -1, fileid);
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break;
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}
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break;
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@ -1002,212 +925,12 @@ out:
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return ret;
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}
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unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
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dev_t dev)
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{
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struct blkio_policy_node *pn;
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unsigned long flags;
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unsigned int weight;
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spin_lock_irqsave(&blkcg->lock, flags);
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pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP,
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BLKIO_PROP_weight_device);
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if (pn)
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weight = pn->val.weight;
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else
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weight = blkcg->weight;
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spin_unlock_irqrestore(&blkcg->lock, flags);
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return weight;
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}
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EXPORT_SYMBOL_GPL(blkcg_get_weight);
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uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev)
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{
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struct blkio_policy_node *pn;
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unsigned long flags;
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uint64_t bps = -1;
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spin_lock_irqsave(&blkcg->lock, flags);
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pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
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BLKIO_THROTL_read_bps_device);
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if (pn)
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bps = pn->val.bps;
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spin_unlock_irqrestore(&blkcg->lock, flags);
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return bps;
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}
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uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev)
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{
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struct blkio_policy_node *pn;
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unsigned long flags;
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uint64_t bps = -1;
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spin_lock_irqsave(&blkcg->lock, flags);
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pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
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BLKIO_THROTL_write_bps_device);
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if (pn)
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bps = pn->val.bps;
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spin_unlock_irqrestore(&blkcg->lock, flags);
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return bps;
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}
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unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev)
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{
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struct blkio_policy_node *pn;
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unsigned long flags;
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unsigned int iops = -1;
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spin_lock_irqsave(&blkcg->lock, flags);
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pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
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BLKIO_THROTL_read_iops_device);
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if (pn)
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iops = pn->val.iops;
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spin_unlock_irqrestore(&blkcg->lock, flags);
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return iops;
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}
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unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev)
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{
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struct blkio_policy_node *pn;
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unsigned long flags;
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unsigned int iops = -1;
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spin_lock_irqsave(&blkcg->lock, flags);
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pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
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BLKIO_THROTL_write_iops_device);
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if (pn)
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iops = pn->val.iops;
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spin_unlock_irqrestore(&blkcg->lock, flags);
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return iops;
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}
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/* Checks whether user asked for deleting a policy rule */
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static bool blkio_delete_rule_command(struct blkio_policy_node *pn)
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{
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switch(pn->plid) {
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case BLKIO_POLICY_PROP:
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if (pn->val.weight == 0)
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return 1;
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break;
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case BLKIO_POLICY_THROTL:
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switch(pn->fileid) {
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case BLKIO_THROTL_read_bps_device:
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case BLKIO_THROTL_write_bps_device:
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if (pn->val.bps == 0)
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return 1;
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break;
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case BLKIO_THROTL_read_iops_device:
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case BLKIO_THROTL_write_iops_device:
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if (pn->val.iops == 0)
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return 1;
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}
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break;
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default:
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BUG();
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}
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return 0;
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}
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static void blkio_update_policy_rule(struct blkio_policy_node *oldpn,
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struct blkio_policy_node *newpn)
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{
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switch(oldpn->plid) {
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case BLKIO_POLICY_PROP:
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oldpn->val.weight = newpn->val.weight;
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break;
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case BLKIO_POLICY_THROTL:
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switch(newpn->fileid) {
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case BLKIO_THROTL_read_bps_device:
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case BLKIO_THROTL_write_bps_device:
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oldpn->val.bps = newpn->val.bps;
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break;
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case BLKIO_THROTL_read_iops_device:
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case BLKIO_THROTL_write_iops_device:
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oldpn->val.iops = newpn->val.iops;
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}
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break;
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default:
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BUG();
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}
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}
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/*
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* Some rules/values in blkg have changed. Propagate those to respective
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* policies.
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*/
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static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg,
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struct blkio_group *blkg, struct blkio_policy_node *pn)
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{
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struct blkio_group_conf *conf = &blkg->conf;
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switch(pn->plid) {
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case BLKIO_POLICY_PROP:
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blkio_update_group_weight(blkg, conf->weight ?: blkcg->weight);
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break;
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case BLKIO_POLICY_THROTL:
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switch(pn->fileid) {
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case BLKIO_THROTL_read_bps_device:
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blkio_update_group_bps(blkg, conf->bps[READ] ?: -1,
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pn->fileid);
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break;
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case BLKIO_THROTL_write_bps_device:
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blkio_update_group_bps(blkg, conf->bps[WRITE] ?: -1,
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pn->fileid);
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break;
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case BLKIO_THROTL_read_iops_device:
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blkio_update_group_iops(blkg, conf->iops[READ] ?: -1,
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pn->fileid);
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break;
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case BLKIO_THROTL_write_iops_device:
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blkio_update_group_iops(blkg, conf->iops[WRITE] ?: -1,
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pn->fileid);
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break;
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}
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break;
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default:
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BUG();
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}
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}
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/*
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* A policy node rule has been updated. Propagate this update to all the
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* block groups which might be affected by this update.
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*/
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static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg,
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struct blkio_policy_node *pn)
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{
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struct blkio_group *blkg;
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struct hlist_node *n;
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spin_lock(&blkio_list_lock);
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spin_lock_irq(&blkcg->lock);
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hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
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if (pn->dev != blkg->dev || pn->plid != blkg->plid)
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continue;
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blkio_update_blkg_policy(blkcg, blkg, pn);
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}
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spin_unlock_irq(&blkcg->lock);
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spin_unlock(&blkio_list_lock);
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}
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static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft,
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const char *buffer)
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{
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int ret = 0;
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char *buf;
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struct blkio_policy_node *newpn, *pn;
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struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
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int keep_newpn = 0;
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enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
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int fileid = BLKIOFILE_ATTR(cft->private);
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@ -1215,69 +938,42 @@ static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft,
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if (!buf)
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return -ENOMEM;
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newpn = kzalloc(sizeof(*newpn), GFP_KERNEL);
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if (!newpn) {
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ret = -ENOMEM;
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goto free_buf;
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}
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ret = blkio_policy_parse_and_set(buf, newpn, plid, fileid, blkcg);
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if (ret)
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goto free_newpn;
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spin_lock_irq(&blkcg->lock);
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pn = blkio_policy_search_node(blkcg, newpn->dev, plid, fileid);
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if (!pn) {
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if (!blkio_delete_rule_command(newpn)) {
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blkio_policy_insert_node(blkcg, newpn);
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keep_newpn = 1;
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}
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spin_unlock_irq(&blkcg->lock);
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goto update_io_group;
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}
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if (blkio_delete_rule_command(newpn)) {
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blkio_policy_delete_node(pn);
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kfree(pn);
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spin_unlock_irq(&blkcg->lock);
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goto update_io_group;
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}
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spin_unlock_irq(&blkcg->lock);
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blkio_update_policy_rule(pn, newpn);
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update_io_group:
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blkio_update_policy_node_blkg(blkcg, newpn);
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free_newpn:
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if (!keep_newpn)
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kfree(newpn);
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free_buf:
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ret = blkio_policy_parse_and_set(buf, plid, fileid, blkcg);
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kfree(buf);
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return ret;
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}
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static void
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blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn)
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static void blkio_print_group_conf(struct cftype *cft, struct blkio_group *blkg,
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struct seq_file *m)
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{
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switch(pn->plid) {
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int fileid = BLKIOFILE_ATTR(cft->private);
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int rw = WRITE;
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switch (blkg->plid) {
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case BLKIO_POLICY_PROP:
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if (pn->fileid == BLKIO_PROP_weight_device)
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seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev),
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MINOR(pn->dev), pn->val.weight);
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if (blkg->conf.weight)
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seq_printf(m, "%u:%u\t%u\n", MAJOR(blkg->dev),
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MINOR(blkg->dev), blkg->conf.weight);
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break;
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case BLKIO_POLICY_THROTL:
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switch(pn->fileid) {
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switch (fileid) {
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case BLKIO_THROTL_read_bps_device:
|
||||
rw = READ;
|
||||
case BLKIO_THROTL_write_bps_device:
|
||||
seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev),
|
||||
MINOR(pn->dev), pn->val.bps);
|
||||
if (blkg->conf.bps[rw])
|
||||
seq_printf(m, "%u:%u\t%llu\n",
|
||||
MAJOR(blkg->dev),
|
||||
MINOR(blkg->dev),
|
||||
blkg->conf.bps[rw]);
|
||||
break;
|
||||
case BLKIO_THROTL_read_iops_device:
|
||||
rw = READ;
|
||||
case BLKIO_THROTL_write_iops_device:
|
||||
seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev),
|
||||
MINOR(pn->dev), pn->val.iops);
|
||||
if (blkg->conf.iops[rw])
|
||||
seq_printf(m, "%u:%u\t%u\n",
|
||||
MAJOR(blkg->dev),
|
||||
MINOR(blkg->dev),
|
||||
blkg->conf.iops[rw]);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
@ -1287,20 +983,17 @@ blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn)
|
||||
}
|
||||
|
||||
/* cgroup files which read their data from policy nodes end up here */
|
||||
static void blkio_read_policy_node_files(struct cftype *cft,
|
||||
struct blkio_cgroup *blkcg, struct seq_file *m)
|
||||
static void blkio_read_conf(struct cftype *cft, struct blkio_cgroup *blkcg,
|
||||
struct seq_file *m)
|
||||
{
|
||||
struct blkio_policy_node *pn;
|
||||
struct blkio_group *blkg;
|
||||
struct hlist_node *n;
|
||||
|
||||
if (!list_empty(&blkcg->policy_list)) {
|
||||
spin_lock_irq(&blkcg->lock);
|
||||
list_for_each_entry(pn, &blkcg->policy_list, node) {
|
||||
if (!pn_matches_cftype(cft, pn))
|
||||
continue;
|
||||
blkio_print_policy_node(m, pn);
|
||||
}
|
||||
spin_unlock_irq(&blkcg->lock);
|
||||
}
|
||||
spin_lock_irq(&blkcg->lock);
|
||||
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
|
||||
if (BLKIOFILE_POLICY(cft->private) == blkg->plid)
|
||||
blkio_print_group_conf(cft, blkg, m);
|
||||
spin_unlock_irq(&blkcg->lock);
|
||||
}
|
||||
|
||||
static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft,
|
||||
@ -1316,7 +1009,7 @@ static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft,
|
||||
case BLKIO_POLICY_PROP:
|
||||
switch(name) {
|
||||
case BLKIO_PROP_weight_device:
|
||||
blkio_read_policy_node_files(cft, blkcg, m);
|
||||
blkio_read_conf(cft, blkcg, m);
|
||||
return 0;
|
||||
default:
|
||||
BUG();
|
||||
@ -1328,7 +1021,7 @@ static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft,
|
||||
case BLKIO_THROTL_write_bps_device:
|
||||
case BLKIO_THROTL_read_iops_device:
|
||||
case BLKIO_THROTL_write_iops_device:
|
||||
blkio_read_policy_node_files(cft, blkcg, m);
|
||||
blkio_read_conf(cft, blkcg, m);
|
||||
return 0;
|
||||
default:
|
||||
BUG();
|
||||
@ -1352,7 +1045,7 @@ static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg,
|
||||
rcu_read_lock();
|
||||
hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) {
|
||||
if (blkg->dev) {
|
||||
if (!cftype_blkg_same_policy(cft, blkg))
|
||||
if (BLKIOFILE_POLICY(cft->private) != blkg->plid)
|
||||
continue;
|
||||
if (pcpu)
|
||||
cgroup_total += blkio_get_stat_cpu(blkg, cb,
|
||||
@ -1451,11 +1144,10 @@ static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft,
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val)
|
||||
static int blkio_weight_write(struct blkio_cgroup *blkcg, int plid, u64 val)
|
||||
{
|
||||
struct blkio_group *blkg;
|
||||
struct hlist_node *n;
|
||||
struct blkio_policy_node *pn;
|
||||
|
||||
if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX)
|
||||
return -EINVAL;
|
||||
@ -1464,14 +1156,10 @@ static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val)
|
||||
spin_lock_irq(&blkcg->lock);
|
||||
blkcg->weight = (unsigned int)val;
|
||||
|
||||
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
|
||||
pn = blkio_policy_search_node(blkcg, blkg->dev,
|
||||
BLKIO_POLICY_PROP, BLKIO_PROP_weight_device);
|
||||
if (pn)
|
||||
continue;
|
||||
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
|
||||
if (blkg->plid == plid && !blkg->conf.weight)
|
||||
blkio_update_group_weight(blkg, blkcg->weight);
|
||||
|
||||
blkio_update_group_weight(blkg, blkcg->weight);
|
||||
}
|
||||
spin_unlock_irq(&blkcg->lock);
|
||||
spin_unlock(&blkio_list_lock);
|
||||
return 0;
|
||||
@ -1510,7 +1198,7 @@ blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
|
||||
case BLKIO_POLICY_PROP:
|
||||
switch(name) {
|
||||
case BLKIO_PROP_weight:
|
||||
return blkio_weight_write(blkcg, val);
|
||||
return blkio_weight_write(blkcg, plid, val);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
@ -1691,7 +1379,6 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)
|
||||
struct blkio_group *blkg;
|
||||
struct request_queue *q;
|
||||
struct blkio_policy_type *blkiop;
|
||||
struct blkio_policy_node *pn, *pntmp;
|
||||
|
||||
rcu_read_lock();
|
||||
do {
|
||||
@ -1723,11 +1410,6 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)
|
||||
spin_unlock(&blkio_list_lock);
|
||||
} while (1);
|
||||
|
||||
list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) {
|
||||
blkio_policy_delete_node(pn);
|
||||
kfree(pn);
|
||||
}
|
||||
|
||||
free_css_id(&blkio_subsys, &blkcg->css);
|
||||
rcu_read_unlock();
|
||||
if (blkcg != &blkio_root_cgroup)
|
||||
@ -1754,7 +1436,6 @@ done:
|
||||
spin_lock_init(&blkcg->lock);
|
||||
INIT_HLIST_HEAD(&blkcg->blkg_list);
|
||||
|
||||
INIT_LIST_HEAD(&blkcg->policy_list);
|
||||
return &blkcg->css;
|
||||
}
|
||||
|
||||
|
@ -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,
|
||||
|
Loading…
Reference in New Issue
Block a user