blkcg: restructure blkio_group configruation setting
As part of userland interface restructuring, this patch updates per-blkio_group configuration setting. Instead of funneling everything through a master function which has hard-coded cases for each config file it may handle, the common part is factored into blkg_conf_prep() and blkg_conf_finish() and different configuration setters are implemented using the helpers. While this doesn't result in immediate LOC reduction, this enables further cleanups and more modular implementation. Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
parent
c4682aec9c
commit
3a8b31d396
@ -43,12 +43,6 @@ EXPORT_SYMBOL_GPL(blkio_root_cgroup);
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static struct blkio_policy_type *blkio_policy[BLKIO_NR_POLICIES];
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static struct blkio_policy_type *blkio_policy[BLKIO_NR_POLICIES];
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/* for encoding cft->private value on file */
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#define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val))
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/* What policy owns the file, proportional or throttle */
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#define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff)
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#define BLKIOFILE_ATTR(val) ((val) & 0xffff)
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struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
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struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
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{
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{
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return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id),
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return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id),
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@ -86,7 +80,7 @@ static inline void blkio_update_group_weight(struct blkio_group *blkg,
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}
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}
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static inline void blkio_update_group_bps(struct blkio_group *blkg, int plid,
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static inline void blkio_update_group_bps(struct blkio_group *blkg, int plid,
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u64 bps, int fileid)
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u64 bps, int rw)
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{
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{
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struct blkio_policy_type *blkiop;
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struct blkio_policy_type *blkiop;
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@ -96,21 +90,18 @@ static inline void blkio_update_group_bps(struct blkio_group *blkg, int plid,
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if (blkiop->plid != plid)
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if (blkiop->plid != plid)
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continue;
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continue;
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if (fileid == BLKIO_THROTL_read_bps_device
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if (rw == READ && blkiop->ops.blkio_update_group_read_bps_fn)
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&& blkiop->ops.blkio_update_group_read_bps_fn)
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blkiop->ops.blkio_update_group_read_bps_fn(blkg->q,
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blkiop->ops.blkio_update_group_read_bps_fn(blkg->q,
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blkg, bps);
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blkg, bps);
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if (fileid == BLKIO_THROTL_write_bps_device
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if (rw == WRITE && blkiop->ops.blkio_update_group_write_bps_fn)
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&& blkiop->ops.blkio_update_group_write_bps_fn)
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blkiop->ops.blkio_update_group_write_bps_fn(blkg->q,
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blkiop->ops.blkio_update_group_write_bps_fn(blkg->q,
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blkg, bps);
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blkg, bps);
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}
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}
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}
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}
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static inline void blkio_update_group_iops(struct blkio_group *blkg,
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static inline void blkio_update_group_iops(struct blkio_group *blkg, int plid,
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int plid, unsigned int iops,
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u64 iops, int rw)
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int fileid)
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{
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{
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struct blkio_policy_type *blkiop;
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struct blkio_policy_type *blkiop;
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@ -120,13 +111,11 @@ static inline void blkio_update_group_iops(struct blkio_group *blkg,
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if (blkiop->plid != plid)
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if (blkiop->plid != plid)
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continue;
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continue;
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if (fileid == BLKIO_THROTL_read_iops_device
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if (rw == READ && blkiop->ops.blkio_update_group_read_iops_fn)
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&& blkiop->ops.blkio_update_group_read_iops_fn)
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blkiop->ops.blkio_update_group_read_iops_fn(blkg->q,
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blkiop->ops.blkio_update_group_read_iops_fn(blkg->q,
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blkg, iops);
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blkg, iops);
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if (fileid == BLKIO_THROTL_write_iops_device
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if (rw == WRITE && blkiop->ops.blkio_update_group_write_iops_fn)
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&& blkiop->ops.blkio_update_group_write_iops_fn)
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blkiop->ops.blkio_update_group_write_iops_fn(blkg->q,
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blkiop->ops.blkio_update_group_write_iops_fn(blkg->q,
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blkg,iops);
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blkg,iops);
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}
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}
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@ -975,19 +964,40 @@ static int blkcg_print_avg_queue_size(struct cgroup *cgrp, struct cftype *cft,
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}
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}
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#endif /* CONFIG_DEBUG_BLK_CGROUP */
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#endif /* CONFIG_DEBUG_BLK_CGROUP */
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static int blkio_policy_parse_and_set(char *buf, enum blkio_policy_id plid,
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struct blkg_conf_ctx {
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int fileid, struct blkio_cgroup *blkcg)
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struct gendisk *disk;
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struct blkio_group *blkg;
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u64 v;
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};
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/**
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* blkg_conf_prep - parse and prepare for per-blkg config update
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* @blkcg: target block cgroup
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* @input: input string
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* @ctx: blkg_conf_ctx to be filled
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*
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* Parse per-blkg config update from @input and initialize @ctx with the
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* result. @ctx->blkg points to the blkg to be updated and @ctx->v the new
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* value. This function returns with RCU read locked and must be paired
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* with blkg_conf_finish().
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*/
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static int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input,
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struct blkg_conf_ctx *ctx)
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__acquires(rcu)
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{
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{
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struct gendisk *disk = NULL;
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struct gendisk *disk;
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struct blkio_group *blkg = NULL;
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struct blkio_group *blkg;
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struct blkg_policy_data *pd;
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char *buf, *s[4], *p, *major_s, *minor_s;
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char *s[4], *p, *major_s = NULL, *minor_s = NULL;
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unsigned long major, minor;
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unsigned long major, minor;
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int i = 0, ret = -EINVAL;
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int i = 0, ret = -EINVAL;
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int part;
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int part;
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dev_t dev;
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dev_t dev;
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u64 temp;
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u64 temp;
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buf = kstrdup(input, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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memset(s, 0, sizeof(s));
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memset(s, 0, sizeof(s));
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while ((p = strsep(&buf, " ")) != NULL) {
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while ((p = strsep(&buf, " ")) != NULL) {
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@ -1037,82 +1047,42 @@ static int blkio_policy_parse_and_set(char *buf, enum blkio_policy_id plid,
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if (IS_ERR(blkg)) {
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if (IS_ERR(blkg)) {
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ret = PTR_ERR(blkg);
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ret = PTR_ERR(blkg);
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goto out_unlock;
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rcu_read_unlock();
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}
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put_disk(disk);
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/*
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pd = blkg->pd[plid];
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* If queue was bypassing, we should retry. Do so after a
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* short msleep(). It isn't strictly necessary but queue
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switch (plid) {
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* can be bypassing for some time and it's always nice to
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case BLKIO_POLICY_PROP:
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* avoid busy looping.
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if ((temp < BLKIO_WEIGHT_MIN && temp > 0) ||
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*/
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temp > BLKIO_WEIGHT_MAX)
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if (ret == -EBUSY) {
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goto out_unlock;
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msleep(10);
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ret = restart_syscall();
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pd->conf.weight = temp;
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blkio_update_group_weight(blkg, plid, 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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pd->conf.bps[READ] = temp;
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blkio_update_group_bps(blkg, plid, temp ?: -1, fileid);
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break;
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case BLKIO_THROTL_write_bps_device:
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pd->conf.bps[WRITE] = temp;
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blkio_update_group_bps(blkg, plid, 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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pd->conf.iops[READ] = temp;
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blkio_update_group_iops(blkg, plid, 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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pd->conf.iops[WRITE] = temp;
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blkio_update_group_iops(blkg, plid, temp ?: -1, fileid);
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break;
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}
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}
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break;
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goto out;
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default:
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BUG();
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}
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}
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ret = 0;
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out_unlock:
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rcu_read_unlock();
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out:
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put_disk(disk);
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/*
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ctx->disk = disk;
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* If queue was bypassing, we should retry. Do so after a short
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ctx->blkg = blkg;
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* msleep(). It isn't strictly necessary but queue can be
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ctx->v = temp;
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* bypassing for some time and it's always nice to avoid busy
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ret = 0;
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* looping.
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out:
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*/
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kfree(buf);
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if (ret == -EBUSY) {
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msleep(10);
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return restart_syscall();
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}
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return ret;
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return ret;
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}
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}
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static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft,
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/**
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const char *buffer)
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* blkg_conf_finish - finish up per-blkg config update
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* @ctx: blkg_conf_ctx intiailized by blkg_conf_prep()
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*
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* Finish up after per-blkg config update. This function must be paired
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* with blkg_conf_prep().
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*/
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static void blkg_conf_finish(struct blkg_conf_ctx *ctx)
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__releases(rcu)
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{
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{
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int ret = 0;
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rcu_read_unlock();
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char *buf;
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put_disk(ctx->disk);
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struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
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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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buf = kstrdup(buffer, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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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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}
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/* for propio conf */
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/* for propio conf */
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@ -1140,6 +1110,32 @@ static int blkcg_print_weight(struct cgroup *cgrp, struct cftype *cft,
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return 0;
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return 0;
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}
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}
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static int blkcg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
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const char *buf)
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{
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struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
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struct blkg_policy_data *pd;
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struct blkg_conf_ctx ctx;
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int ret;
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ret = blkg_conf_prep(blkcg, buf, &ctx);
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if (ret)
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return ret;
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ret = -EINVAL;
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pd = ctx.blkg->pd[BLKIO_POLICY_PROP];
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if (pd && (!ctx.v || (ctx.v >= BLKIO_WEIGHT_MIN &&
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ctx.v <= BLKIO_WEIGHT_MAX))) {
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pd->conf.weight = ctx.v;
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blkio_update_group_weight(ctx.blkg, BLKIO_POLICY_PROP,
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ctx.v ?: blkcg->weight);
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ret = 0;
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}
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blkg_conf_finish(&ctx);
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return ret;
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}
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static int blkcg_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val)
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static int blkcg_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val)
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{
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{
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struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
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struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
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@ -1181,39 +1177,67 @@ static u64 blkg_prfill_conf_u64(struct seq_file *sf,
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static int blkcg_print_conf_u64(struct cgroup *cgrp, struct cftype *cft,
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static int blkcg_print_conf_u64(struct cgroup *cgrp, struct cftype *cft,
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struct seq_file *sf)
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struct seq_file *sf)
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{
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{
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int off;
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switch (BLKIOFILE_ATTR(cft->private)) {
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case BLKIO_THROTL_read_bps_device:
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off = offsetof(struct blkio_group_conf, bps[READ]);
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break;
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case BLKIO_THROTL_write_bps_device:
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off = offsetof(struct blkio_group_conf, bps[WRITE]);
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break;
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case BLKIO_THROTL_read_iops_device:
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off = offsetof(struct blkio_group_conf, iops[READ]);
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break;
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case BLKIO_THROTL_write_iops_device:
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off = offsetof(struct blkio_group_conf, iops[WRITE]);
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break;
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default:
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return -EINVAL;
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}
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blkcg_print_blkgs(sf, cgroup_to_blkio_cgroup(cgrp),
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blkcg_print_blkgs(sf, cgroup_to_blkio_cgroup(cgrp),
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blkg_prfill_conf_u64, BLKIO_POLICY_THROTL,
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blkg_prfill_conf_u64, BLKIO_POLICY_THROTL,
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off, false);
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cft->private, false);
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return 0;
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return 0;
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}
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}
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static int blkcg_set_conf_u64(struct cgroup *cgrp, struct cftype *cft,
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const char *buf, int rw,
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void (*update)(struct blkio_group *, int, u64, int))
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{
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struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
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struct blkg_policy_data *pd;
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struct blkg_conf_ctx ctx;
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int ret;
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ret = blkg_conf_prep(blkcg, buf, &ctx);
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if (ret)
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return ret;
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ret = -EINVAL;
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pd = ctx.blkg->pd[BLKIO_POLICY_THROTL];
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if (pd) {
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*(u64 *)((void *)&pd->conf + cft->private) = ctx.v;
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update(ctx.blkg, BLKIO_POLICY_THROTL, ctx.v ?: -1, rw);
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ret = 0;
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}
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blkg_conf_finish(&ctx);
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return ret;
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}
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static int blkcg_set_conf_bps_r(struct cgroup *cgrp, struct cftype *cft,
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const char *buf)
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{
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return blkcg_set_conf_u64(cgrp, cft, buf, READ, blkio_update_group_bps);
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}
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static int blkcg_set_conf_bps_w(struct cgroup *cgrp, struct cftype *cft,
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const char *buf)
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{
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return blkcg_set_conf_u64(cgrp, cft, buf, WRITE, blkio_update_group_bps);
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}
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static int blkcg_set_conf_iops_r(struct cgroup *cgrp, struct cftype *cft,
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const char *buf)
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{
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return blkcg_set_conf_u64(cgrp, cft, buf, READ, blkio_update_group_iops);
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}
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static int blkcg_set_conf_iops_w(struct cgroup *cgrp, struct cftype *cft,
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const char *buf)
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{
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return blkcg_set_conf_u64(cgrp, cft, buf, WRITE, blkio_update_group_iops);
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}
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#endif
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#endif
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struct cftype blkio_files[] = {
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struct cftype blkio_files[] = {
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{
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{
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.name = "weight_device",
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.name = "weight_device",
|
||||||
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
|
|
||||||
BLKIO_PROP_weight_device),
|
|
||||||
.read_seq_string = blkcg_print_weight_device,
|
.read_seq_string = blkcg_print_weight_device,
|
||||||
.write_string = blkiocg_file_write,
|
.write_string = blkcg_set_weight_device,
|
||||||
.max_write_len = 256,
|
.max_write_len = 256,
|
||||||
},
|
},
|
||||||
{
|
{
|
||||||
@ -1276,37 +1300,33 @@ struct cftype blkio_files[] = {
|
|||||||
#ifdef CONFIG_BLK_DEV_THROTTLING
|
#ifdef CONFIG_BLK_DEV_THROTTLING
|
||||||
{
|
{
|
||||||
.name = "throttle.read_bps_device",
|
.name = "throttle.read_bps_device",
|
||||||
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
|
.private = offsetof(struct blkio_group_conf, bps[READ]),
|
||||||
BLKIO_THROTL_read_bps_device),
|
|
||||||
.read_seq_string = blkcg_print_conf_u64,
|
.read_seq_string = blkcg_print_conf_u64,
|
||||||
.write_string = blkiocg_file_write,
|
.write_string = blkcg_set_conf_bps_r,
|
||||||
.max_write_len = 256,
|
.max_write_len = 256,
|
||||||
},
|
},
|
||||||
|
|
||||||
{
|
{
|
||||||
.name = "throttle.write_bps_device",
|
.name = "throttle.write_bps_device",
|
||||||
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
|
.private = offsetof(struct blkio_group_conf, bps[WRITE]),
|
||||||
BLKIO_THROTL_write_bps_device),
|
|
||||||
.read_seq_string = blkcg_print_conf_u64,
|
.read_seq_string = blkcg_print_conf_u64,
|
||||||
.write_string = blkiocg_file_write,
|
.write_string = blkcg_set_conf_bps_w,
|
||||||
.max_write_len = 256,
|
.max_write_len = 256,
|
||||||
},
|
},
|
||||||
|
|
||||||
{
|
{
|
||||||
.name = "throttle.read_iops_device",
|
.name = "throttle.read_iops_device",
|
||||||
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
|
.private = offsetof(struct blkio_group_conf, iops[READ]),
|
||||||
BLKIO_THROTL_read_iops_device),
|
|
||||||
.read_seq_string = blkcg_print_conf_u64,
|
.read_seq_string = blkcg_print_conf_u64,
|
||||||
.write_string = blkiocg_file_write,
|
.write_string = blkcg_set_conf_iops_r,
|
||||||
.max_write_len = 256,
|
.max_write_len = 256,
|
||||||
},
|
},
|
||||||
|
|
||||||
{
|
{
|
||||||
.name = "throttle.write_iops_device",
|
.name = "throttle.write_iops_device",
|
||||||
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
|
.private = offsetof(struct blkio_group_conf, iops[WRITE]),
|
||||||
BLKIO_THROTL_write_iops_device),
|
|
||||||
.read_seq_string = blkcg_print_conf_u64,
|
.read_seq_string = blkcg_print_conf_u64,
|
||||||
.write_string = blkiocg_file_write,
|
.write_string = blkcg_set_conf_iops_w,
|
||||||
.max_write_len = 256,
|
.max_write_len = 256,
|
||||||
},
|
},
|
||||||
{
|
{
|
||||||
|
@ -50,19 +50,6 @@ enum blkg_state_flags {
|
|||||||
BLKG_empty,
|
BLKG_empty,
|
||||||
};
|
};
|
||||||
|
|
||||||
/* cgroup files owned by proportional weight policy */
|
|
||||||
enum blkcg_file_name_prop {
|
|
||||||
BLKIO_PROP_weight_device,
|
|
||||||
};
|
|
||||||
|
|
||||||
/* cgroup files owned by throttle policy */
|
|
||||||
enum blkcg_file_name_throtl {
|
|
||||||
BLKIO_THROTL_read_bps_device,
|
|
||||||
BLKIO_THROTL_write_bps_device,
|
|
||||||
BLKIO_THROTL_read_iops_device,
|
|
||||||
BLKIO_THROTL_write_iops_device,
|
|
||||||
};
|
|
||||||
|
|
||||||
struct blkio_cgroup {
|
struct blkio_cgroup {
|
||||||
struct cgroup_subsys_state css;
|
struct cgroup_subsys_state css;
|
||||||
unsigned int weight;
|
unsigned int weight;
|
||||||
|
Loading…
x
Reference in New Issue
Block a user