blktrace_api.h

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#ifndef BLKTRACE_H
#define BLKTRACE_H

#include <linux/blkdev.h>
#include <linux/relay.h>
#include <linux/compat.h>
#include <uapi/linux/blktrace_api.h>

#if defined(CONFIG_BLK_DEV_IO_TRACE)

#include <linux/sysfs.h>

struct blk_trace {
    int trace_state;
    struct rchan *rchan;
    unsigned long __percpu *sequence;
    unsigned char __percpu *msg_data;
    u16 act_mask;
    u64 start_lba;
    u64 end_lba;
    u32 pid;
    u32 dev;
    struct dentry *dir;
    struct dentry *dropped_file;
    struct dentry *msg_file;
    atomic_t dropped;
};

extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(struct request_queue *);
extern int do_blk_trace_setup(struct request_queue *q, char *name,
                  dev_t dev, struct block_device *bdev,
                  struct blk_user_trace_setup *buts);
extern __printf(2, 3)
void __trace_note_message(struct blk_trace *, const char *fmt, ...);

#define blk_add_trace_msg(q, fmt, ...)                  \
    do {                                \
        struct blk_trace *bt = (q)->blk_trace;          \
        if (unlikely(bt))                   \
            __trace_note_message(bt, fmt, ##__VA_ARGS__);   \
    } while (0)
#define BLK_TN_MAX_MSG      128

extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
                void *data, size_t len);
extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
               struct block_device *bdev,
               char __user *arg);
extern int blk_trace_startstop(struct request_queue *q, int start);
extern int blk_trace_remove(struct request_queue *q);
extern void blk_trace_remove_sysfs(struct device *dev);
extern int blk_trace_init_sysfs(struct device *dev);

extern struct attribute_group blk_trace_attr_group;

#else /* !CONFIG_BLK_DEV_IO_TRACE */
# define blk_trace_ioctl(bdev, cmd, arg)        (-ENOTTY)
# define blk_trace_shutdown(q)              do { } while (0)
# define do_blk_trace_setup(q, name, dev, bdev, buts)   (-ENOTTY)
# define blk_add_driver_data(q, rq, data, len)      do {} while (0)
# define blk_trace_setup(q, name, dev, bdev, arg)   (-ENOTTY)
# define blk_trace_startstop(q, start)          (-ENOTTY)
# define blk_trace_remove(q)                (-ENOTTY)
# define blk_add_trace_msg(q, fmt, ...)         do { } while (0)
# define blk_trace_remove_sysfs(dev)            do { } while (0)
static inline int blk_trace_init_sysfs(struct device *dev)
{
    return 0;
}

#endif /* CONFIG_BLK_DEV_IO_TRACE */

#ifdef CONFIG_COMPAT

struct compat_blk_user_trace_setup {
    char name[32];
    u16 act_mask;
    u32 buf_size;
    u32 buf_nr;
    compat_u64 start_lba;
    compat_u64 end_lba;
    u32 pid;
};
#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)

#endif

#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)

static inline int blk_cmd_buf_len(struct request *rq)
{
    return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
}

extern void blk_dump_cmd(char *buf, struct request *rq);
extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);

#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */

#endif