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Release 4.12 include/linux/blk-cgroup.h

Directory: include/linux
#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/percpu_counter.h>
#include <linux/seq_file.h>
#include <linux/radix-tree.h>
#include <linux/blkdev.h>
#include <linux/atomic.h>

/* percpu_counter batch for blkg_[rw]stats, per-cpu drift doesn't matter */

#define BLKG_STAT_CPU_BATCH	(INT_MAX / 2)

/* Max limits for throttle policy */

#define THROTL_IOPS_MAX		UINT_MAX

#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	__rcu		*blkg_hint;
	
struct hlist_head		blkg_list;

	
struct blkcg_policy_data	*cpd[BLKCG_MAX_POLS];

	
struct list_head		all_blkcgs_node;
#ifdef CONFIG_CGROUP_WRITEBACK
	
struct list_head		cgwb_list;
#endif
};

/*
 * blkg_[rw]stat->aux_cnt is excluded for local stats but included for
 * recursive.  Used to carry stats of dead children, and, for blkg_rwstat,
 * to carry result values from read and sum operations.
 */

struct blkg_stat {
	
struct percpu_counter		cpu_cnt;
	
atomic64_t			aux_cnt;
};


struct blkg_rwstat {
	
struct percpu_counter		cpu_cnt[BLKG_RWSTAT_NR];
	
atomic64_t			aux_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 blkg:policy pair is
 * represented by a blkg_policy_data which is allocated and freed by each
 * policy's pd_alloc/free_fn() methods.  A policy can allocate private data
 * area by allocating larger data structure which embeds blkg_policy_data
 * at the beginning.
 */

struct blkg_policy_data {
	/* the blkg and policy id this per-policy data belongs to */
	
struct blkcg_gq			*blkg;
	
int				plid;
};

/*
 * Policies that need to keep per-blkcg data which is independent from any
 * request_queue associated to it should implement cpd_alloc/free_fn()
 * methods.  A policy can allocate private data area by allocating larger
 * data structure which embeds blkcg_policy_data at the beginning.
 * cpd_init() is invoked to let each policy handle per-blkcg data.
 */

struct blkcg_policy_data {
	/* the blkcg and policy id this per-policy data belongs to */
	
struct blkcg			*blkcg;
	
int				plid;
};

/* 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;

	/*
         * Each blkg gets congested separately and the congestion state is
         * propagated to the matching bdi_writeback_congested.
         */
	
struct bdi_writeback_congested	*wb_congested;

	/* 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_rwstat		stat_bytes;
	
struct blkg_rwstat		stat_ios;

	
struct blkg_policy_data		*pd[BLKCG_MAX_POLS];

	
struct rcu_head			rcu_head;
};


typedef struct blkcg_policy_data *(blkcg_pol_alloc_cpd_fn)(gfp_t gfp);

typedef void (blkcg_pol_init_cpd_fn)(struct blkcg_policy_data *cpd);

typedef void (blkcg_pol_free_cpd_fn)(struct blkcg_policy_data *cpd);

typedef void (blkcg_pol_bind_cpd_fn)(struct blkcg_policy_data *cpd);

typedef struct blkg_policy_data *(blkcg_pol_alloc_pd_fn)(gfp_t gfp, int node);

typedef void (blkcg_pol_init_pd_fn)(struct blkg_policy_data *pd);

typedef void (blkcg_pol_online_pd_fn)(struct blkg_policy_data *pd);

typedef void (blkcg_pol_offline_pd_fn)(struct blkg_policy_data *pd);

typedef void (blkcg_pol_free_pd_fn)(struct blkg_policy_data *pd);

typedef void (blkcg_pol_reset_pd_stats_fn)(struct blkg_policy_data *pd);


struct blkcg_policy {
	
int				plid;
	/* cgroup files for the policy */
	
struct cftype			*dfl_cftypes;
	
struct cftype			*legacy_cftypes;

	/* operations */
	
blkcg_pol_alloc_cpd_fn		*cpd_alloc_fn;
	
blkcg_pol_init_cpd_fn		*cpd_init_fn;
	
blkcg_pol_free_cpd_fn		*cpd_free_fn;
	
blkcg_pol_bind_cpd_fn		*cpd_bind_fn;

	
blkcg_pol_alloc_pd_fn		*pd_alloc_fn;
	
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_free_pd_fn		*pd_free_fn;
	
blkcg_pol_reset_pd_stats_fn	*pd_reset_stats_fn;
};

extern struct blkcg blkcg_root;
extern struct cgroup_subsys_state * const blkcg_root_css;

struct blkcg_gq *blkg_lookup_slowpath(struct blkcg *blkcg,
				      struct request_queue *q, bool update_hint);
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);

const char *blkg_dev_name(struct blkcg_gq *blkg);
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);
int blkg_print_stat_bytes(struct seq_file *sf, void *v);
int blkg_print_stat_ios(struct seq_file *sf, void *v);
int blkg_print_stat_bytes_recursive(struct seq_file *sf, void *v);
int blkg_print_stat_ios_recursive(struct seq_file *sf, void *v);

u64 blkg_stat_recursive_sum(struct blkcg_gq *blkg,
			    struct blkcg_policy *pol, int off);
struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkcg_gq *blkg,
					     struct blkcg_policy *pol, int off);


struct blkg_conf_ctx {
	
struct gendisk			*disk;
	
struct blkcg_gq			*blkg;
	
char				*body;
};

int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
		   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; }

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static inline struct blkcg *task_blkcg(struct task_struct *tsk) { return css_to_blkcg(task_css(tsk, io_cgrp_id)); }

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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); }

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static inline struct cgroup_subsys_state * task_get_blkcg_css(struct task_struct *task) { return task_get_css(task, io_cgrp_id); }

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/** * 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); }

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/** * __blkg_lookup - internal version of blkg_lookup() * @blkcg: blkcg of interest * @q: request_queue of interest * @update_hint: whether to update lookup hint with the result or not * * This is internal version and shouldn't be used by policy * implementations. Looks up blkgs for the @blkcg - @q pair regardless of * @q's bypass state. If @update_hint is %true, the caller should be * holding @q->queue_lock and lookup hint is updated on success. */
static inline struct blkcg_gq *__blkg_lookup(struct blkcg *blkcg, struct request_queue *q, bool update_hint) { struct blkcg_gq *blkg; if (blkcg == &blkcg_root) return q->root_blkg; blkg = rcu_dereference(blkcg->blkg_hint); if (blkg && blkg->q == q) return blkg; return blkg_lookup_slowpath(blkcg, q, update_hint); }

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/** * blkg_lookup - lookup blkg for the specified blkcg - q pair * @blkcg: blkcg of interest * @q: request_queue of interest * * Lookup blkg for the @blkcg - @q pair. This function should be called * under RCU read lock and is guaranteed to return %NULL if @q is bypassing * - see blk_queue_bypass_start() for details. */
static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, struct request_queue *q) { WARN_ON_ONCE(!rcu_read_lock_held()); if (unlikely(blk_queue_bypass(q))) return NULL; return __blkg_lookup(blkcg, q, false); }

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/** * 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; }

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static inline struct blkcg_policy_data *blkcg_to_cpd(struct blkcg *blkcg, struct blkcg_policy *pol) { return blkcg ? blkcg->cpd[pol->plid] : NULL; }

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/** * 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; }

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static inline struct blkcg *cpd_to_blkcg(struct blkcg_policy_data *cpd) { return cpd ? cpd->blkcg : NULL; }

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/** * 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) { return cgroup_path(blkg->blkcg->css.cgroup, buf, buflen); }

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/** * 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); }

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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); }

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/** * 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(blkcg, q); if (unlikely(!blkg)) goto root_rl; blkg_get(blkg); rcu_read_unlock(); return &blkg->rl; root_rl: rcu_read_unlock(); return &q->root_rl; }

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/** * 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) { if (rl->blkg->blkcg != &blkcg_root) blkg_put(rl->blkg); }

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/** * 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; }

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/** * 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; }

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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 int blkg_stat_init(struct blkg_stat *stat, gfp_t gfp) { int ret; ret = percpu_counter_init(&stat->cpu_cnt, 0, gfp); if (ret) return ret; atomic64_set(&stat->aux_cnt, 0); return 0; }

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static inline void blkg_stat_exit(struct blkg_stat *stat) { percpu_counter_destroy(&stat->cpu_cnt); }

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/** * blkg_stat_add - add a value to a blkg_stat * @stat: target blkg_stat * @val: value to add * * Add @val to @stat. The caller must ensure that IRQ on the same CPU * don't re-enter this function for the same counter. */
static inline void blkg_stat_add(struct blkg_stat *stat, uint64_t val) { __percpu_counter_add(&stat->cpu_cnt, val, BLKG_STAT_CPU_BATCH); }

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/** * blkg_stat_read - read the current value of a blkg_stat * @stat: blkg_stat to read */
static inline uint64_t blkg_stat_read(struct blkg_stat *stat) { return percpu_counter_sum_positive(&stat->cpu_cnt); }

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/** * blkg_stat_reset - reset a blkg_stat * @stat: blkg_stat to reset */
static inline void blkg_stat_reset(struct blkg_stat *stat) { percpu_counter_set(&stat->cpu_cnt, 0); atomic64_set(&stat->aux_cnt, 0); }

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/** * blkg_stat_add_aux - add a blkg_stat into another's aux count * @to: the destination blkg_stat * @from: the source * * Add @from's count including the aux one to @to's aux count. */
static inline void blkg_stat_add_aux(struct blkg_stat *to, struct blkg_stat *from) { atomic64_add(blkg_stat_read(from) + atomic64_read(&from->aux_cnt), &to->aux_cnt); }

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static inline int blkg_rwstat_init(struct blkg_rwstat *rwstat, gfp_t gfp) { int i, ret; for (i = 0; i < BLKG_RWSTAT_NR; i++) { ret = percpu_counter_init(&rwstat->cpu_cnt[i], 0, gfp); if (ret) { while (--i >= 0) percpu_counter_destroy(&rwstat->cpu_cnt[i]); return ret; } atomic64_set(&rwstat->aux_cnt[i], 0); } return 0; }

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static inline void blkg_rwstat_exit(struct blkg_rwstat *rwstat) { int i; for (i = 0; i < BLKG_RWSTAT_NR; i++) percpu_counter_destroy(&rwstat->cpu_cnt[i]); }

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/** * blkg_rwstat_add - add a value to a blkg_rwstat * @rwstat: target blkg_rwstat * @op: REQ_OP and flags * @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, unsigned int op, uint64_t val) { struct percpu_counter *cnt; if (op_is_write(op)) cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_WRITE]; else cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_READ]; __percpu_counter_add(cnt, val, BLKG_STAT_CPU_BATCH); if (op_is_sync(op)) cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_SYNC]; else cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_ASYNC]; __percpu_counter_add(cnt, val, BLKG_STAT_CPU_BATCH); }

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/** * 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 in the aux counts. */
static inline struct blkg_rwstat blkg_rwstat_read(struct blkg_rwstat *rwstat) { struct blkg_rwstat result; int i; for (i = 0; i < BLKG_RWSTAT_NR; i++) atomic64_set(&result.aux_cnt[i], percpu_counter_sum_positive(&rwstat->cpu_cnt[i])); return result; }

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/** * 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 atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_READ]) + atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_WRITE]); }

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/** * blkg_rwstat_reset - reset a blkg_rwstat * @rwstat: blkg_rwstat to reset */
static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat) { int i; for (i = 0; i < BLKG_RWSTAT_NR; i++) { percpu_counter_set(&rwstat->cpu_cnt[i], 0); atomic64_set(&rwstat->aux_cnt[i], 0); } }

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/** * blkg_rwstat_add_aux - add a blkg_rwstat into another's aux count * @to: the destination blkg_rwstat * @from: the source * * Add @from's count including the aux one to @to's aux count. */
static inline void blkg_rwstat_add_aux(struct blkg_rwstat *to, struct blkg_rwstat *from) { struct blkg_rwstat v = blkg_rwstat_read(from); int i; for (i = 0; i < BLKG_RWSTAT_NR; i++) atomic64_add(atomic64_read(&v.aux_cnt[i]) + atomic64_read(&from->aux_cnt[i]), &to->aux_cnt[i]); }

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Tejun Heo75100.00%3100.00%
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#ifdef CONFIG_BLK_DEV_THROTTLING extern bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg, struct bio *bio); #else
static inline bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg, struct bio *bio) { return false; }

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#endif
static inline bool blkcg_bio_issue_check(struct request_queue *q, struct bio *bio) { struct blkcg *blkcg; struct blkcg_gq *blkg; bool throtl = false; rcu_read_lock(); blkcg = bio_blkcg(bio); blkg = blkg_lookup(blkcg, q); if (unlikely(!blkg)) { spin_lock_irq(q->queue_lock); blkg = blkg_lookup_create(blkcg, q); if (IS_ERR(blkg)) blkg = NULL; spin_unlock_irq(q->queue_lock); } throtl = blk_throtl_bio(q, blkg, bio); if (!throtl) { blkg = blkg ?: q->root_blkg; blkg_rwstat_add(&blkg->stat_bytes, bio->bi_opf, bio->bi_iter.bi_size); blkg_rwstat_add(&blkg->stat_ios, bio->bi_opf, 1); } rcu_read_unlock(); return !throtl; }

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Tejun Heo15998.76%266.67%
Jens Axboe21.24%133.33%
Total161100.00%3100.00%

#else /* CONFIG_BLK_CGROUP */ struct blkcg { }; struct blkg_policy_data { }; struct blkcg_policy_data { }; struct blkcg_gq { }; struct blkcg_policy { }; #define blkcg_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL))
static inline struct cgroup_subsys_state * task_get_blkcg_css(struct task_struct *task) { return NULL; }

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#ifdef CONFIG_BLOCK
static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; }

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static inline int blkcg_init_queue(struct request_queue *q) { return 0; }

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static inline void blkcg_drain_queue(struct request_queue *q) { }

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static inline void blkcg_exit_queue(struct request_queue *q) { }

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Tejun Heo11100.00%1100.00%
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static inline int blkcg_policy_register(struct blkcg_policy *pol) { return 0; }

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Tejun Heo960.00%266.67%
Vivek Goyal640.00%133.33%
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static inline void blkcg_policy_unregister(struct blkcg_policy *pol) { }

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Vivek Goyal872.73%150.00%
Tejun Heo327.27%150.00%
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static inline int blkcg_activate_policy(struct request_queue *q, const struct blkcg_policy *pol) { return 0; }

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static inline void blkcg_deactivate_policy(struct request_queue *q, const struct blkcg_policy *pol) { }

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static inline struct blkcg *bio_blkcg(struct bio *bio) { return NULL; }

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static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg, struct blkcg_policy *pol) { return NULL; }

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static inline struct blkcg_gq *pd_to_blkg(struct blkg_policy_data *pd) { return NULL; }

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static inline char *blkg_path(struct blkcg_gq *blkg) { return NULL; }

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Tejun Heo16.25%150.00%
Total16100.00%2100.00%


static inline void blkg_get(struct blkcg_gq *blkg) { }

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static inline void blkg_put(struct blkcg_gq *blkg) { }

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static inline struct request_list *blk_get_rl(struct request_queue *q, struct bio *bio) { return &q->root_rl; }

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static inline void blk_put_rl(struct request_list *rl) { }

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static inline void blk_rq_set_rl(struct request *rq, struct request_list *rl) { }

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static inline struct request_list *blk_rq_rl(struct request *rq) { return &rq->q->root_rl; }

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static inline bool blkcg_bio_issue_check(struct request_queue *q, struct bio *bio) { return true; }

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Tejun Heo20100.00%1100.00%
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#define blk_queue_for_each_rl(rl, q) \ for ((rl) = &(q)->root_rl; (rl); (rl) = NULL) #endif /* CONFIG_BLOCK */ #endif /* CONFIG_BLK_CGROUP */ #endif /* _BLK_CGROUP_H */

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Tejun Heo254191.30%7280.00%
Vivek Goyal1093.92%77.78%
Arianna Avanzini642.30%11.11%
Peter Zijlstra341.22%11.11%
Divyesh Shah130.47%22.22%
Jens Axboe90.32%22.22%
Christoph Hellwig60.22%22.22%
Michael Christie60.22%22.22%
Bart Van Assche10.04%11.11%
Total2783100.00%90100.00%
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