LXR linux/include/linux/blktrace

   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#include <linux/list.h>
   9
  10#if defined(CONFIG_BLK_DEV_IO_TRACE)
  11
  12#include <linux/sysfs.h>
  13
  14struct blk_trace {
  15        int trace_state;
  16        struct rchan *rchan;
  17        unsigned long __percpu *sequence;
  18        unsigned char __percpu *msg_data;
  19        u16 act_mask;
  20        u64 start_lba;
  21        u64 end_lba;
  22        u32 pid;
  23        u32 dev;
  24        struct dentry *dir;
  25        struct dentry *dropped_file;
  26        struct dentry *msg_file;
  27        struct list_head running_list;
  28        atomic_t dropped;
  29};
  30
  31extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
  32extern void blk_trace_shutdown(struct request_queue *);
  33extern __printf(2, 3)
  34void __trace_note_message(struct blk_trace *, const char *fmt, ...);
  35
  36/**
  37 * blk_add_trace_msg - Add a (simple) message to the blktrace stream
  38 * @q:          queue the io is for
  39 * @fmt:        format to print message in
  40 * args...      Variable argument list for format
  41 *
  42 * Description:
  43 *     Records a (simple) message onto the blktrace stream.
  44 *
  45 *     NOTE: BLK_TN_MAX_MSG characters are output at most.
  46 *     NOTE: Can not use 'static inline' due to presence of var args...
  47 *
  48 **/
  49#define blk_add_trace_msg(q, fmt, ...)                                  \
  50        do {                                                            \
  51                struct blk_trace *bt = (q)->blk_trace;                  \
  52                if (unlikely(bt))                                       \
  53                        __trace_note_message(bt, fmt, ##__VA_ARGS__);   \
  54        } while (0)
  55#define BLK_TN_MAX_MSG          128
  56
  57static inline bool blk_trace_note_message_enabled(struct request_queue *q)
  58{
  59        struct blk_trace *bt = q->blk_trace;
  60        if (likely(!bt))
  61                return false;
  62        return bt->act_mask & BLK_TC_NOTIFY;
  63}
  64
  65extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
  66                                void *data, size_t len);
  67extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
  68                           struct block_device *bdev,
  69                           char __user *arg);
  70extern int blk_trace_startstop(struct request_queue *q, int start);
  71extern int blk_trace_remove(struct request_queue *q);
  72extern void blk_trace_remove_sysfs(struct device *dev);
  73extern int blk_trace_init_sysfs(struct device *dev);
  74
  75extern struct attribute_group blk_trace_attr_group;
  76
  77#else /* !CONFIG_BLK_DEV_IO_TRACE */
  78# define blk_trace_ioctl(bdev, cmd, arg)                (-ENOTTY)
  79# define blk_trace_shutdown(q)                          do { } while (0)
  80# define blk_add_driver_data(q, rq, data, len)          do {} while (0)
  81# define blk_trace_setup(q, name, dev, bdev, arg)       (-ENOTTY)
  82# define blk_trace_startstop(q, start)                  (-ENOTTY)
  83# define blk_trace_remove(q)                            (-ENOTTY)
  84# define blk_add_trace_msg(q, fmt, ...)                 do { } while (0)
  85# define blk_trace_remove_sysfs(dev)                    do { } while (0)
  86# define blk_trace_note_message_enabled(q)              (false)
  87static inline int blk_trace_init_sysfs(struct device *dev)
  88{
  89        return 0;
  90}
  91
  92#endif /* CONFIG_BLK_DEV_IO_TRACE */
  93
  94#ifdef CONFIG_COMPAT
  95
  96struct compat_blk_user_trace_setup {
  97        char name[BLKTRACE_BDEV_SIZE];
  98        u16 act_mask;
  99        u32 buf_size;
 100        u32 buf_nr;
 101        compat_u64 start_lba;
 102        compat_u64 end_lba;
 103        u32 pid;
 104};
 105#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
 106
 107#endif
 108
 109extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes);
 110
 111static inline sector_t blk_rq_trace_sector(struct request *rq)
 112{
 113        return blk_rq_is_passthrough(rq) ? 0 : blk_rq_pos(rq);
 114}
 115
 116static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq)
 117{
 118        return blk_rq_is_passthrough(rq) ? 0 : blk_rq_sectors(rq);
 119}
 120
 121#endif
 122