text: /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  #ifndef BLKTRACE_H
  #define BLKTRACE_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 */
  	__BLK_TA_CGROUP = 1 << 8,	/* from a cgroup*/
  };
  
  /*
   * 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 */
  	__BLK_TN_CGROUP = __BLK_TA_CGROUP, /* from a cgroup */
  };
  
  
  /*
   * 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 nanoseconds */
  	__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 */
  	/* cgroup id will be stored here if exists */
  };
  
  /*
   * 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 BLKTRACESETUP
   */
  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 /* BLKTRACE_H */
  