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#ifndef IOCONTEXT_H
#define IOCONTEXT_H

#include <linux/radix-tree.h>
#include <linux/rcupdate.h>

struct cfq_queue;
struct cfq_io_context {
    void *key;

    struct cfq_queue *cfqq[2];

    struct io_context *ioc;

    unsigned long last_end_request;

    unsigned long ttime_total;
    unsigned long ttime_samples;
    unsigned long ttime_mean;

    struct list_head queue_list;
    struct hlist_node cic_list;

    void (*dtor)(struct io_context *); /* destructor */
    void (*exit)(struct io_context *); /* called on task exit */

    struct rcu_head rcu_head;
};

/*
 * I/O subsystem state of the associated processes.  It is refcounted
 * and kmalloc'ed. These could be shared between processes.
 */
struct io_context {
    atomic_long_t refcount;
    atomic_t nr_tasks;

    /* all the fields below are protected by this lock */
    spinlock_t lock;

    unsigned short ioprio;
    unsigned short ioprio_changed;

#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
    unsigned short cgroup_changed;
#endif

    /*
     * For request batching
     */
    int nr_batch_requests;     /* Number of requests left in the batch */
    unsigned long last_waited; /* Time last woken after wait for request */

    struct radix_tree_root radix_root;
    struct hlist_head cic_list;
    void __rcu *ioc_data;
};

static inline struct io_context *ioc_task_link(struct io_context *ioc)
{
    /*
     * if ref count is zero, don't allow sharing (ioc is going away, it's
     * a race).
     */
    if (ioc && atomic_long_inc_not_zero(&ioc->refcount)) {
        atomic_inc(&ioc->nr_tasks);
        return ioc;
    }

    return NULL;
}

struct task_struct;
#ifdef CONFIG_BLOCK
int put_io_context(struct io_context *ioc);
void exit_io_context(struct task_struct *task);
struct io_context *get_io_context(gfp_t gfp_flags, int node);
struct io_context *alloc_io_context(gfp_t gfp_flags, int node);
#else
static inline void exit_io_context(struct task_struct *task)
{
}

struct io_context;
static inline int put_io_context(struct io_context *ioc)
{
    return 1;
}
#endif

#endif
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