root/include/uapi/linux/blktrace_api.h

INCLUDED FROM

#ifndef _UAPIBLKTRACE_H
#define _UAPIBLKTRACE_H

#include <linux/types.h>

/*
 * Trace categories
 */
enum blktrace_cat {
        BLK_TC_READ     = 1 << 0,       /* reads */
        BLK_TC_WRITE    = 1 << 1,       /* writes */
        BLK_TC_FLUSH    = 1 << 2,       /* flush */
        BLK_TC_SYNC     = 1 << 3,       /* sync IO */
        BLK_TC_SYNCIO   = BLK_TC_SYNC,
        BLK_TC_QUEUE    = 1 << 4,       /* queueing/merging */
        BLK_TC_REQUEUE  = 1 << 5,       /* requeueing */
        BLK_TC_ISSUE    = 1 << 6,       /* issue */
        BLK_TC_COMPLETE = 1 << 7,       /* completions */
        BLK_TC_FS       = 1 << 8,       /* fs requests */
        BLK_TC_PC       = 1 << 9,       /* pc requests */
        BLK_TC_NOTIFY   = 1 << 10,      /* special message */
        BLK_TC_AHEAD    = 1 << 11,      /* readahead */
        BLK_TC_META     = 1 << 12,      /* metadata */
        BLK_TC_DISCARD  = 1 << 13,      /* discard requests */
        BLK_TC_DRV_DATA = 1 << 14,      /* binary per-driver data */
        BLK_TC_FUA      = 1 << 15,      /* fua requests */

        BLK_TC_END      = 1 << 15,      /* we've run out of bits! */
};

#define BLK_TC_SHIFT            (16)
#define BLK_TC_ACT(act)         ((act) << BLK_TC_SHIFT)

/*
 * Basic trace actions
 */
enum blktrace_act {
        __BLK_TA_QUEUE = 1,             /* queued */
        __BLK_TA_BACKMERGE,             /* back merged to existing rq */
        __BLK_TA_FRONTMERGE,            /* front merge to existing rq */
        __BLK_TA_GETRQ,                 /* allocated new request */
        __BLK_TA_SLEEPRQ,               /* sleeping on rq allocation */
        __BLK_TA_REQUEUE,               /* request requeued */
        __BLK_TA_ISSUE,                 /* sent to driver */
        __BLK_TA_COMPLETE,              /* completed by driver */
        __BLK_TA_PLUG,                  /* queue was plugged */
        __BLK_TA_UNPLUG_IO,             /* queue was unplugged by io */
        __BLK_TA_UNPLUG_TIMER,          /* queue was unplugged by timer */
        __BLK_TA_INSERT,                /* insert request */
        __BLK_TA_SPLIT,                 /* bio was split */
        __BLK_TA_BOUNCE,                /* bio was bounced */
        __BLK_TA_REMAP,                 /* bio was remapped */
        __BLK_TA_ABORT,                 /* request aborted */
        __BLK_TA_DRV_DATA,              /* driver-specific binary data */
};

/*
 * Notify events.
 */
enum blktrace_notify {
        __BLK_TN_PROCESS = 0,           /* establish pid/name mapping */
        __BLK_TN_TIMESTAMP,             /* include system clock */
        __BLK_TN_MESSAGE,               /* Character string message */
};


/*
 * Trace actions in full. Additionally, read or write is masked
 */
#define BLK_TA_QUEUE            (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_BACKMERGE        (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_FRONTMERGE       (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_GETRQ            (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_SLEEPRQ          (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_REQUEUE          (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
#define BLK_TA_ISSUE            (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
#define BLK_TA_COMPLETE         (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
#define BLK_TA_PLUG             (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_UNPLUG_IO        (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_UNPLUG_TIMER     (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_INSERT           (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_SPLIT            (__BLK_TA_SPLIT)
#define BLK_TA_BOUNCE           (__BLK_TA_BOUNCE)
#define BLK_TA_REMAP            (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_ABORT            (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA))

#define BLK_TN_PROCESS          (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
#define BLK_TN_TIMESTAMP        (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
#define BLK_TN_MESSAGE          (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))

#define BLK_IO_TRACE_MAGIC      0x65617400
#define BLK_IO_TRACE_VERSION    0x07

/*
 * The trace itself
 */
struct blk_io_trace {
        __u32 magic;            /* MAGIC << 8 | version */
        __u32 sequence;         /* event number */
        __u64 time;             /* in microseconds */
        __u64 sector;           /* disk offset */
        __u32 bytes;            /* transfer length */
        __u32 action;           /* what happened */
        __u32 pid;              /* who did it */
        __u32 device;           /* device number */
        __u32 cpu;              /* on what cpu did it happen */
        __u16 error;            /* completion error */
        __u16 pdu_len;          /* length of data after this trace */
};

/*
 * The remap event
 */
struct blk_io_trace_remap {
        __be32 device_from;
        __be32 device_to;
        __be64 sector_from;
};

enum {
        Blktrace_setup = 1,
        Blktrace_running,
        Blktrace_stopped,
};

#define BLKTRACE_BDEV_SIZE      32

/*
 * User setup structure passed with BLKTRACESTART
 */
struct blk_user_trace_setup {
        char name[BLKTRACE_BDEV_SIZE];  /* output */
        __u16 act_mask;                 /* input */
        __u32 buf_size;                 /* input */
        __u32 buf_nr;                   /* input */
        __u64 start_lba;
        __u64 end_lba;
        __u32 pid;
};

#endif /* _UAPIBLKTRACE_H */