diff options
Diffstat (limited to 'block/blk-cgroup.h')
-rw-r--r-- | block/blk-cgroup.h | 603 |
1 files changed, 0 insertions, 603 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h deleted file mode 100644 index c567865..0000000 --- a/block/blk-cgroup.h +++ /dev/null @@ -1,603 +0,0 @@ -#ifndef _BLK_CGROUP_H -#define _BLK_CGROUP_H -/* - * Common Block IO controller cgroup interface - * - * Based on ideas and code from CFQ, CFS and BFQ: - * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> - * - * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> - * Paolo Valente <paolo.valente@unimore.it> - * - * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> - * Nauman Rafique <nauman@google.com> - */ - -#include <linux/cgroup.h> -#include <linux/u64_stats_sync.h> -#include <linux/seq_file.h> -#include <linux/radix-tree.h> -#include <linux/blkdev.h> -#include <linux/atomic.h> - -/* Max limits for throttle policy */ -#define THROTL_IOPS_MAX UINT_MAX - -/* CFQ specific, out here for blkcg->cfq_weight */ -#define CFQ_WEIGHT_MIN 10 -#define CFQ_WEIGHT_MAX 1000 -#define CFQ_WEIGHT_DEFAULT 500 - -#ifdef CONFIG_BLK_CGROUP - -enum blkg_rwstat_type { - BLKG_RWSTAT_READ, - BLKG_RWSTAT_WRITE, - BLKG_RWSTAT_SYNC, - BLKG_RWSTAT_ASYNC, - - BLKG_RWSTAT_NR, - BLKG_RWSTAT_TOTAL = BLKG_RWSTAT_NR, -}; - -struct blkcg_gq; - -struct blkcg { - struct cgroup_subsys_state css; - spinlock_t lock; - - struct radix_tree_root blkg_tree; - struct blkcg_gq *blkg_hint; - struct hlist_head blkg_list; - - /* TODO: per-policy storage in blkcg */ - unsigned int cfq_weight; /* belongs to cfq */ - unsigned int cfq_leaf_weight; -}; - -struct blkg_stat { - struct u64_stats_sync syncp; - uint64_t cnt; -}; - -struct blkg_rwstat { - struct u64_stats_sync syncp; - uint64_t cnt[BLKG_RWSTAT_NR]; -}; - -/* - * A blkcg_gq (blkg) is association between a block cgroup (blkcg) and a - * request_queue (q). This is used by blkcg policies which need to track - * information per blkcg - q pair. - * - * There can be multiple active blkcg policies and each has its private - * data on each blkg, the size of which is determined by - * blkcg_policy->pd_size. blkcg core allocates and frees such areas - * together with blkg and invokes pd_init/exit_fn() methods. - * - * Such private data must embed struct blkg_policy_data (pd) at the - * beginning and pd_size can't be smaller than pd. - */ -struct blkg_policy_data { - /* the blkg and policy id this per-policy data belongs to */ - struct blkcg_gq *blkg; - int plid; - - /* used during policy activation */ - struct list_head alloc_node; -}; - -/* association between a blk cgroup and a request queue */ -struct blkcg_gq { - /* Pointer to the associated request_queue */ - struct request_queue *q; - struct list_head q_node; - struct hlist_node blkcg_node; - struct blkcg *blkcg; - - /* all non-root blkcg_gq's are guaranteed to have access to parent */ - struct blkcg_gq *parent; - - /* request allocation list for this blkcg-q pair */ - struct request_list rl; - - /* reference count */ - atomic_t refcnt; - - /* is this blkg online? protected by both blkcg and q locks */ - bool online; - - struct blkg_policy_data *pd[BLKCG_MAX_POLS]; - - struct rcu_head rcu_head; -}; - -typedef void (blkcg_pol_init_pd_fn)(struct blkcg_gq *blkg); -typedef void (blkcg_pol_online_pd_fn)(struct blkcg_gq *blkg); -typedef void (blkcg_pol_offline_pd_fn)(struct blkcg_gq *blkg); -typedef void (blkcg_pol_exit_pd_fn)(struct blkcg_gq *blkg); -typedef void (blkcg_pol_reset_pd_stats_fn)(struct blkcg_gq *blkg); - -struct blkcg_policy { - int plid; - /* policy specific private data size */ - size_t pd_size; - /* cgroup files for the policy */ - struct cftype *cftypes; - - /* operations */ - blkcg_pol_init_pd_fn *pd_init_fn; - blkcg_pol_online_pd_fn *pd_online_fn; - blkcg_pol_offline_pd_fn *pd_offline_fn; - blkcg_pol_exit_pd_fn *pd_exit_fn; - blkcg_pol_reset_pd_stats_fn *pd_reset_stats_fn; -}; - -extern struct blkcg blkcg_root; - -struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, struct request_queue *q); -struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg, - struct request_queue *q); -int blkcg_init_queue(struct request_queue *q); -void blkcg_drain_queue(struct request_queue *q); -void blkcg_exit_queue(struct request_queue *q); - -/* Blkio controller policy registration */ -int blkcg_policy_register(struct blkcg_policy *pol); -void blkcg_policy_unregister(struct blkcg_policy *pol); -int blkcg_activate_policy(struct request_queue *q, - const struct blkcg_policy *pol); -void blkcg_deactivate_policy(struct request_queue *q, - const struct blkcg_policy *pol); - -void blkcg_print_blkgs(struct seq_file *sf, struct blkcg *blkcg, - u64 (*prfill)(struct seq_file *, - struct blkg_policy_data *, int), - const struct blkcg_policy *pol, int data, - bool show_total); -u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v); -u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd, - const struct blkg_rwstat *rwstat); -u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, int off); -u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd, - int off); - -u64 blkg_stat_recursive_sum(struct blkg_policy_data *pd, int off); -struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkg_policy_data *pd, - int off); - -struct blkg_conf_ctx { - struct gendisk *disk; - struct blkcg_gq *blkg; - u64 v; -}; - -int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, - const char *input, struct blkg_conf_ctx *ctx); -void blkg_conf_finish(struct blkg_conf_ctx *ctx); - - -static inline struct blkcg *css_to_blkcg(struct cgroup_subsys_state *css) -{ - return css ? container_of(css, struct blkcg, css) : NULL; -} - -static inline struct blkcg *task_blkcg(struct task_struct *tsk) -{ - return css_to_blkcg(task_css(tsk, blkio_cgrp_id)); -} - -static inline struct blkcg *bio_blkcg(struct bio *bio) -{ - if (bio && bio->bi_css) - return css_to_blkcg(bio->bi_css); - return task_blkcg(current); -} - -/** - * blkcg_parent - get the parent of a blkcg - * @blkcg: blkcg of interest - * - * Return the parent blkcg of @blkcg. Can be called anytime. - */ -static inline struct blkcg *blkcg_parent(struct blkcg *blkcg) -{ - return css_to_blkcg(blkcg->css.parent); -} - -/** - * blkg_to_pdata - get policy private data - * @blkg: blkg of interest - * @pol: policy of interest - * - * Return pointer to private data associated with the @blkg-@pol pair. - */ -static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg, - struct blkcg_policy *pol) -{ - return blkg ? blkg->pd[pol->plid] : NULL; -} - -/** - * pdata_to_blkg - get blkg associated with policy private data - * @pd: policy private data of interest - * - * @pd is policy private data. Determine the blkg it's associated with. - */ -static inline struct blkcg_gq *pd_to_blkg(struct blkg_policy_data *pd) -{ - return pd ? pd->blkg : NULL; -} - -/** - * blkg_path - format cgroup path of blkg - * @blkg: blkg of interest - * @buf: target buffer - * @buflen: target buffer length - * - * Format the path of the cgroup of @blkg into @buf. - */ -static inline int blkg_path(struct blkcg_gq *blkg, char *buf, int buflen) -{ - char *p; - - p = cgroup_path(blkg->blkcg->css.cgroup, buf, buflen); - if (!p) { - strncpy(buf, "<unavailable>", buflen); - return -ENAMETOOLONG; - } - - memmove(buf, p, buf + buflen - p); - return 0; -} - -/** - * blkg_get - get a blkg reference - * @blkg: blkg to get - * - * The caller should be holding an existing reference. - */ -static inline void blkg_get(struct blkcg_gq *blkg) -{ - WARN_ON_ONCE(atomic_read(&blkg->refcnt) <= 0); - atomic_inc(&blkg->refcnt); -} - -void __blkg_release_rcu(struct rcu_head *rcu); - -/** - * blkg_put - put a blkg reference - * @blkg: blkg to put - */ -static inline void blkg_put(struct blkcg_gq *blkg) -{ - WARN_ON_ONCE(atomic_read(&blkg->refcnt) <= 0); - if (atomic_dec_and_test(&blkg->refcnt)) - call_rcu(&blkg->rcu_head, __blkg_release_rcu); -} - -struct blkcg_gq *__blkg_lookup(struct blkcg *blkcg, struct request_queue *q, - bool update_hint); - -/** - * blkg_for_each_descendant_pre - pre-order walk of a blkg's descendants - * @d_blkg: loop cursor pointing to the current descendant - * @pos_css: used for iteration - * @p_blkg: target blkg to walk descendants of - * - * Walk @c_blkg through the descendants of @p_blkg. Must be used with RCU - * read locked. If called under either blkcg or queue lock, the iteration - * is guaranteed to include all and only online blkgs. The caller may - * update @pos_css by calling css_rightmost_descendant() to skip subtree. - * @p_blkg is included in the iteration and the first node to be visited. - */ -#define blkg_for_each_descendant_pre(d_blkg, pos_css, p_blkg) \ - css_for_each_descendant_pre((pos_css), &(p_blkg)->blkcg->css) \ - if (((d_blkg) = __blkg_lookup(css_to_blkcg(pos_css), \ - (p_blkg)->q, false))) - -/** - * blkg_for_each_descendant_post - post-order walk of a blkg's descendants - * @d_blkg: loop cursor pointing to the current descendant - * @pos_css: used for iteration - * @p_blkg: target blkg to walk descendants of - * - * Similar to blkg_for_each_descendant_pre() but performs post-order - * traversal instead. Synchronization rules are the same. @p_blkg is - * included in the iteration and the last node to be visited. - */ -#define blkg_for_each_descendant_post(d_blkg, pos_css, p_blkg) \ - css_for_each_descendant_post((pos_css), &(p_blkg)->blkcg->css) \ - if (((d_blkg) = __blkg_lookup(css_to_blkcg(pos_css), \ - (p_blkg)->q, false))) - -/** - * blk_get_rl - get request_list to use - * @q: request_queue of interest - * @bio: bio which will be attached to the allocated request (may be %NULL) - * - * The caller wants to allocate a request from @q to use for @bio. Find - * the request_list to use and obtain a reference on it. Should be called - * under queue_lock. This function is guaranteed to return non-%NULL - * request_list. - */ -static inline struct request_list *blk_get_rl(struct request_queue *q, - struct bio *bio) -{ - struct blkcg *blkcg; - struct blkcg_gq *blkg; - - rcu_read_lock(); - - blkcg = bio_blkcg(bio); - - /* bypass blkg lookup and use @q->root_rl directly for root */ - if (blkcg == &blkcg_root) - goto root_rl; - - /* - * Try to use blkg->rl. blkg lookup may fail under memory pressure - * or if either the blkcg or queue is going away. Fall back to - * root_rl in such cases. - */ - blkg = blkg_lookup_create(blkcg, q); - if (unlikely(IS_ERR(blkg))) - goto root_rl; - - blkg_get(blkg); - rcu_read_unlock(); - return &blkg->rl; -root_rl: - rcu_read_unlock(); - return &q->root_rl; -} - -/** - * blk_put_rl - put request_list - * @rl: request_list to put - * - * Put the reference acquired by blk_get_rl(). Should be called under - * queue_lock. - */ -static inline void blk_put_rl(struct request_list *rl) -{ - /* root_rl may not have blkg set */ - if (rl->blkg && rl->blkg->blkcg != &blkcg_root) - blkg_put(rl->blkg); -} - -/** - * blk_rq_set_rl - associate a request with a request_list - * @rq: request of interest - * @rl: target request_list - * - * Associate @rq with @rl so that accounting and freeing can know the - * request_list @rq came from. - */ -static inline void blk_rq_set_rl(struct request *rq, struct request_list *rl) -{ - rq->rl = rl; -} - -/** - * blk_rq_rl - return the request_list a request came from - * @rq: request of interest - * - * Return the request_list @rq is allocated from. - */ -static inline struct request_list *blk_rq_rl(struct request *rq) -{ - return rq->rl; -} - -struct request_list *__blk_queue_next_rl(struct request_list *rl, - struct request_queue *q); -/** - * blk_queue_for_each_rl - iterate through all request_lists of a request_queue - * - * Should be used under queue_lock. - */ -#define blk_queue_for_each_rl(rl, q) \ - for ((rl) = &(q)->root_rl; (rl); (rl) = __blk_queue_next_rl((rl), (q))) - -static inline void blkg_stat_init(struct blkg_stat *stat) -{ - u64_stats_init(&stat->syncp); -} - -/** - * blkg_stat_add - add a value to a blkg_stat - * @stat: target blkg_stat - * @val: value to add - * - * Add @val to @stat. The caller is responsible for synchronizing calls to - * this function. - */ -static inline void blkg_stat_add(struct blkg_stat *stat, uint64_t val) -{ - u64_stats_update_begin(&stat->syncp); - stat->cnt += val; - u64_stats_update_end(&stat->syncp); -} - -/** - * blkg_stat_read - read the current value of a blkg_stat - * @stat: blkg_stat to read - * - * Read the current value of @stat. This function can be called without - * synchroniztion and takes care of u64 atomicity. - */ -static inline uint64_t blkg_stat_read(struct blkg_stat *stat) -{ - unsigned int start; - uint64_t v; - - do { - start = u64_stats_fetch_begin_irq(&stat->syncp); - v = stat->cnt; - } while (u64_stats_fetch_retry_irq(&stat->syncp, start)); - - return v; -} - -/** - * blkg_stat_reset - reset a blkg_stat - * @stat: blkg_stat to reset - */ -static inline void blkg_stat_reset(struct blkg_stat *stat) -{ - stat->cnt = 0; -} - -/** - * blkg_stat_merge - merge a blkg_stat into another - * @to: the destination blkg_stat - * @from: the source - * - * Add @from's count to @to. - */ -static inline void blkg_stat_merge(struct blkg_stat *to, struct blkg_stat *from) -{ - blkg_stat_add(to, blkg_stat_read(from)); -} - -static inline void blkg_rwstat_init(struct blkg_rwstat *rwstat) -{ - u64_stats_init(&rwstat->syncp); -} - -/** - * blkg_rwstat_add - add a value to a blkg_rwstat - * @rwstat: target blkg_rwstat - * @rw: mask of REQ_{WRITE|SYNC} - * @val: value to add - * - * Add @val to @rwstat. The counters are chosen according to @rw. The - * caller is responsible for synchronizing calls to this function. - */ -static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat, - int rw, uint64_t val) -{ - u64_stats_update_begin(&rwstat->syncp); - - if (rw & REQ_WRITE) - rwstat->cnt[BLKG_RWSTAT_WRITE] += val; - else - rwstat->cnt[BLKG_RWSTAT_READ] += val; - if (rw & REQ_SYNC) - rwstat->cnt[BLKG_RWSTAT_SYNC] += val; - else - rwstat->cnt[BLKG_RWSTAT_ASYNC] += val; - - u64_stats_update_end(&rwstat->syncp); -} - -/** - * blkg_rwstat_read - read the current values of a blkg_rwstat - * @rwstat: blkg_rwstat to read - * - * Read the current snapshot of @rwstat and return it as the return value. - * This function can be called without synchronization and takes care of - * u64 atomicity. - */ -static inline struct blkg_rwstat blkg_rwstat_read(struct blkg_rwstat *rwstat) -{ - unsigned int start; - struct blkg_rwstat tmp; - - do { - start = u64_stats_fetch_begin_irq(&rwstat->syncp); - tmp = *rwstat; - } while (u64_stats_fetch_retry_irq(&rwstat->syncp, start)); - - return tmp; -} - -/** - * blkg_rwstat_total - read the total count of a blkg_rwstat - * @rwstat: blkg_rwstat to read - * - * Return the total count of @rwstat regardless of the IO direction. This - * function can be called without synchronization and takes care of u64 - * atomicity. - */ -static inline uint64_t blkg_rwstat_total(struct blkg_rwstat *rwstat) -{ - struct blkg_rwstat tmp = blkg_rwstat_read(rwstat); - - return tmp.cnt[BLKG_RWSTAT_READ] + tmp.cnt[BLKG_RWSTAT_WRITE]; -} - -/** - * blkg_rwstat_reset - reset a blkg_rwstat - * @rwstat: blkg_rwstat to reset - */ -static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat) -{ - memset(rwstat->cnt, 0, sizeof(rwstat->cnt)); -} - -/** - * blkg_rwstat_merge - merge a blkg_rwstat into another - * @to: the destination blkg_rwstat - * @from: the source - * - * Add @from's counts to @to. - */ -static inline void blkg_rwstat_merge(struct blkg_rwstat *to, - struct blkg_rwstat *from) -{ - struct blkg_rwstat v = blkg_rwstat_read(from); - int i; - - u64_stats_update_begin(&to->syncp); - for (i = 0; i < BLKG_RWSTAT_NR; i++) - to->cnt[i] += v.cnt[i]; - u64_stats_update_end(&to->syncp); -} - -#else /* CONFIG_BLK_CGROUP */ - -struct cgroup; -struct blkcg; - -struct blkg_policy_data { -}; - -struct blkcg_gq { -}; - -struct blkcg_policy { -}; - -static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; } -static inline int blkcg_init_queue(struct request_queue *q) { return 0; } -static inline void blkcg_drain_queue(struct request_queue *q) { } -static inline void blkcg_exit_queue(struct request_queue *q) { } -static inline int blkcg_policy_register(struct blkcg_policy *pol) { return 0; } -static inline void blkcg_policy_unregister(struct blkcg_policy *pol) { } -static inline int blkcg_activate_policy(struct request_queue *q, - const struct blkcg_policy *pol) { return 0; } -static inline void blkcg_deactivate_policy(struct request_queue *q, - const struct blkcg_policy *pol) { } - -static inline struct blkcg *bio_blkcg(struct bio *bio) { return NULL; } - -static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg, - struct blkcg_policy *pol) { return NULL; } -static inline struct blkcg_gq *pd_to_blkg(struct blkg_policy_data *pd) { return NULL; } -static inline char *blkg_path(struct blkcg_gq *blkg) { return NULL; } -static inline void blkg_get(struct blkcg_gq *blkg) { } -static inline void blkg_put(struct blkcg_gq *blkg) { } - -static inline struct request_list *blk_get_rl(struct request_queue *q, - struct bio *bio) { return &q->root_rl; } -static inline void blk_put_rl(struct request_list *rl) { } -static inline void blk_rq_set_rl(struct request *rq, struct request_list *rl) { } -static inline struct request_list *blk_rq_rl(struct request *rq) { return &rq->q->root_rl; } - -#define blk_queue_for_each_rl(rl, q) \ - for ((rl) = &(q)->root_rl; (rl); (rl) = NULL) - -#endif /* CONFIG_BLK_CGROUP */ -#endif /* _BLK_CGROUP_H */ |