linux/include/linux/blktrace_api.h
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   1#ifndef BLKTRACE_H
   2#define BLKTRACE_H
   3
   4#include <linux/blkdev.h>
   5#include <linux/relay.h>
   6#include <linux/compat.h>
   7#include <uapi/linux/blktrace_api.h>
   8
   9#if defined(CONFIG_BLK_DEV_IO_TRACE)
  10
  11#include <linux/sysfs.h>
  12
  13struct blk_trace {
  14        int trace_state;
  15        struct rchan *rchan;
  16        unsigned long __percpu *sequence;
  17        unsigned char __percpu *msg_data;
  18        u16 act_mask;
  19        u64 start_lba;
  20        u64 end_lba;
  21        u32 pid;
  22        u32 dev;
  23        struct dentry *dir;
  24        struct dentry *dropped_file;
  25        struct dentry *msg_file;
  26        atomic_t dropped;
  27};
  28
  29extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
  30extern void blk_trace_shutdown(struct request_queue *);
  31extern int do_blk_trace_setup(struct request_queue *q, char *name,
  32                              dev_t dev, struct block_device *bdev,
  33                              struct blk_user_trace_setup *buts);
  34extern __printf(2, 3)
  35void __trace_note_message(struct blk_trace *, const char *fmt, ...);
  36
  37/**
  38 * blk_add_trace_msg - Add a (simple) message to the blktrace stream
  39 * @q:          queue the io is for
  40 * @fmt:        format to print message in
  41 * args...      Variable argument list for format
  42 *
  43 * Description:
  44 *     Records a (simple) message onto the blktrace stream.
  45 *
  46 *     NOTE: BLK_TN_MAX_MSG characters are output at most.
  47 *     NOTE: Can not use 'static inline' due to presence of var args...
  48 *
  49 **/
  50#define blk_add_trace_msg(q, fmt, ...)                                  \
  51        do {                                                            \
  52                struct blk_trace *bt = (q)->blk_trace;                  \
  53                if (unlikely(bt))                                       \
  54                        __trace_note_message(bt, fmt, ##__VA_ARGS__);   \
  55        } while (0)
  56#define BLK_TN_MAX_MSG          128
  57
  58extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
  59                                void *data, size_t len);
  60extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
  61                           struct block_device *bdev,
  62                           char __user *arg);
  63extern int blk_trace_startstop(struct request_queue *q, int start);
  64extern int blk_trace_remove(struct request_queue *q);
  65extern void blk_trace_remove_sysfs(struct device *dev);
  66extern int blk_trace_init_sysfs(struct device *dev);
  67
  68extern struct attribute_group blk_trace_attr_group;
  69
  70#else /* !CONFIG_BLK_DEV_IO_TRACE */
  71# define blk_trace_ioctl(bdev, cmd, arg)                (-ENOTTY)
  72# define blk_trace_shutdown(q)                          do { } while (0)
  73# define do_blk_trace_setup(q, name, dev, bdev, buts)   (-ENOTTY)
  74# define blk_add_driver_data(q, rq, data, len)          do {} while (0)
  75# define blk_trace_setup(q, name, dev, bdev, arg)       (-ENOTTY)
  76# define blk_trace_startstop(q, start)                  (-ENOTTY)
  77# define blk_trace_remove(q)                            (-ENOTTY)
  78# define blk_add_trace_msg(q, fmt, ...)                 do { } while (0)
  79# define blk_trace_remove_sysfs(dev)                    do { } while (0)
  80static inline int blk_trace_init_sysfs(struct device *dev)
  81{
  82        return 0;
  83}
  84
  85#endif /* CONFIG_BLK_DEV_IO_TRACE */
  86
  87#ifdef CONFIG_COMPAT
  88
  89struct compat_blk_user_trace_setup {
  90        char name[32];
  91        u16 act_mask;
  92        u32 buf_size;
  93        u32 buf_nr;
  94        compat_u64 start_lba;
  95        compat_u64 end_lba;
  96        u32 pid;
  97};
  98#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
  99
 100#endif
 101
 102#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
 103
 104static inline int blk_cmd_buf_len(struct request *rq)
 105{
 106        return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
 107}
 108
 109extern void blk_dump_cmd(char *buf, struct request *rq);
 110extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
 111
 112#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
 113
 114#endif
 115
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