[PATCH 00/21] blktrace: Add user-space support for zoned command tracing

[PATCH 00/21] blktrace: Add user-space support for zoned command tracing

[Johannes Thumshirn]

This patch series extends the user-space blktrace tools to support the new
trace events for zoned block device commands introduced in the corresponding
kernel patch series.

The updates include:

- Introduction of a new ioctl requesting the v2 version of the trace
- Definitions for new zoned operation trace events.
- Parsing support in blkparse for these events.
- Display of the new events with clear labeling (e.g., ZO, ZA, ZR).
- Backward-compatible changes that do not affect existing functionality.

These changes complement the kernel patches and allow full visibility into
zone management commands in blktrace output, enabling better analysis and
debugging of zoned storage workloads.

The updated blktrace utility will first issue the BLKTRACESETUP2 ioctl and if
it fails transpartently fall back to BLKTRACESETUP allowing backwards
compatibility.

Feedback and testing on additional device types are appreciated.

Johannes Thumshirn (21):
  fix comment for struct blk_trace_setup:
  add definitions for BLKTRACESETUP2
  call BLKTRACESETUP2 ioctl per default to setup a trace
  blktrace: change size of action to 64 bits
  blktrace: add definitions for blk_io_trace2
  blktrace: support protocol version 8
  blkparse: pass magic to get_magic
  blkparse: read 'magic' first
  blkparse: factor out reading of a singe blk_io_trace event
  blkparse: skip unsupported protocol versions
  blkparse: make get_pdulen() take the pdu_len
  blkiomon: read 'magic' first
  blktrace: pass magic to CHECK_MAGIC macro
  blktrace: pass magic to verify_trace
  blktrace: rename trace_to_cpu to bit_trace_to_cpu
  blkparse: use blk_io_trace2 internally
  blkparse: natively parse blk_io_trace2
  blkparse: parse zone (un)plug actions
  blkparse: add zoned commands to fill_rwbs()
  blkparse: parse zone management commands
  blkparse: parse zone append completions

 act_mask.c     |   4 +-
 blkiomon.c     |  15 +-
 blkparse.c     | 450 ++++++++++++++++++++++++++++++++++---------------
 blkparse_fmt.c | 105 +++++++++---
 blkrawverify.c |  14 +-
 blktrace.c     |  40 ++++-
 blktrace.h     |  64 +++++--
 blktrace_api.h |  54 +++++-
 8 files changed, 560 insertions(+), 186 deletions(-)

-- 
2.51.0

[PATCH 01/21] fix comment for struct blk_trace_setup:

[Johannes Thumshirn]

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blktrace_api.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/blktrace_api.h b/blktrace_api.h
index 8c760b8..172b4c2 100644
--- a/blktrace_api.h
+++ b/blktrace_api.h
@@ -127,7 +127,7 @@ struct blk_io_cgroup_payload {
 };
 
 /*
- * User setup structure passed with BLKSTARTTRACE
+ * User setup structure passed with BLKTRACESETUP
  */
 struct blk_user_trace_setup {
 	char name[32];			/* output */
-- 
2.51.0

Re: [PATCH 01/21] fix comment for struct blk_trace_setup:

[Chaitanya Kulkarni]

On 9/9/25 04:07, Johannes Thumshirn wrote:
> Signed-off-by: Johannes Thumshirn<johannes.thumshirn@wdc.com>
> ---
>   blktrace_api.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/blktrace_api.h b/blktrace_api.h
> index 8c760b8..172b4c2 100644
> --- a/blktrace_api.h
> +++ b/blktrace_api.h
> @@ -127,7 +127,7 @@ struct blk_io_cgroup_payload {
>   };
>   
>   /*
> - * User setup structure passed with BLKSTARTTRACE
> + * User setup structure passed with BLKTRACESETUP
>    */
>   struct blk_user_trace_setup {
>   	char name[32];			/* output */
> -- 2.51.0

Looks good.

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>

-ck

[PATCH 02/21] add definitions for BLKTRACESETUP2

[Johannes Thumshirn]

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blktrace_api.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/blktrace_api.h b/blktrace_api.h
index 172b4c2..9f435a5 100644
--- a/blktrace_api.h
+++ b/blktrace_api.h
@@ -139,9 +139,24 @@ struct blk_user_trace_setup {
 	__u32 pid;
 };
 
+/*
+ * User setup structure passed with BLKTRACESETUP2
+ */
+struct blk_user_trace_setup2 {
+	char name[32];			/* output */
+	__u64 act_mask;			/* input */
+	__u32 buf_size;			/* input */
+	__u32 buf_nr;			/* input */
+	__u64 start_lba;
+	__u64 end_lba;
+	__u32 pid;
+	__u32 reserved;			/* for futute use */
+};
+
 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
 #define BLKTRACESTART _IO(0x12,116)
 #define BLKTRACESTOP _IO(0x12,117)
 #define BLKTRACETEARDOWN _IO(0x12,118)
+#define BLKTRACESETUP2 _IOWR(0x12, 142, struct blk_user_trace_setup2)
 
 #endif
-- 
2.51.0

Re: [PATCH 02/21] add definitions for BLKTRACESETUP2

[Chaitanya Kulkarni]

On 9/9/25 04:07, Johannes Thumshirn wrote:
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> ---
>   blktrace_api.h | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
>
> diff --git a/blktrace_api.h b/blktrace_api.h
> index 172b4c2..9f435a5 100644
> --- a/blktrace_api.h
> +++ b/blktrace_api.h
> @@ -139,9 +139,24 @@ struct blk_user_trace_setup {
>   	__u32 pid;
>   };
>   
> +/*
> + * User setup structure passed with BLKTRACESETUP2
> + */
> +struct blk_user_trace_setup2 {
> +	char name[32];			/* output */
> +	__u64 act_mask;			/* input */
> +	__u32 buf_size;			/* input */
> +	__u32 buf_nr;			/* input */
> +	__u64 start_lba;
> +	__u64 end_lba;
> +	__u32 pid;
> +	__u32 reserved;			/* for futute use */
> +};
> +
>   #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
>   #define BLKTRACESTART _IO(0x12,116)
>   #define BLKTRACESTOP _IO(0x12,117)
>   #define BLKTRACETEARDOWN _IO(0x12,118)
> +#define BLKTRACESETUP2 _IOWR(0x12, 142, struct blk_user_trace_setup2)
>   
>   #endif

This definitely needs a commit log explaining why you need setup2 struct and
what kind of problem it is solving.

-ck

Re: [PATCH 02/21] add definitions for BLKTRACESETUP2

[Johannes Thumshirn]

On 9/19/25 9:53 AM, Chaitanya Kulkarni wrote:
> On 9/9/25 04:07, Johannes Thumshirn wrote:
>> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
>> ---
>>    blktrace_api.h | 15 +++++++++++++++
>>    1 file changed, 15 insertions(+)
>>
>> diff --git a/blktrace_api.h b/blktrace_api.h
>> index 172b4c2..9f435a5 100644
>> --- a/blktrace_api.h
>> +++ b/blktrace_api.h
>> @@ -139,9 +139,24 @@ struct blk_user_trace_setup {
>>    	__u32 pid;
>>    };
>>    
>> +/*
>> + * User setup structure passed with BLKTRACESETUP2
>> + */
>> +struct blk_user_trace_setup2 {
>> +	char name[32];			/* output */
>> +	__u64 act_mask;			/* input */
>> +	__u32 buf_size;			/* input */
>> +	__u32 buf_nr;			/* input */
>> +	__u64 start_lba;
>> +	__u64 end_lba;
>> +	__u32 pid;
>> +	__u32 reserved;			/* for futute use */
>> +};
>> +
>>    #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
>>    #define BLKTRACESTART _IO(0x12,116)
>>    #define BLKTRACESTOP _IO(0x12,117)
>>    #define BLKTRACETEARDOWN _IO(0x12,118)
>> +#define BLKTRACESETUP2 _IOWR(0x12, 142, struct blk_user_trace_setup2)
>>    
>>    #endif
> This definitely needs a commit log explaining why you need setup2 struct and
> what kind of problem it is solving.

Whoopsie, you're 100% right!

[PATCH 03/21] call BLKTRACESETUP2 ioctl per default to setup a trace

[Johannes Thumshirn]

Call BLKTRACESETUP2 ioctl per default and if the kernel does not support
this ioctl because it is too old, fall back to calling BLKTRACESETUP.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blktrace.c | 40 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/blktrace.c b/blktrace.c
index 038b2cb..72562fd 100644
--- a/blktrace.c
+++ b/blktrace.c
@@ -279,7 +279,7 @@ static int max_cpus;
 static int ncpus;
 static cpu_set_t *online_cpus;
 static int pagesize;
-static int act_mask = ~0U;
+static unsigned long long act_mask = ~0U;
 static int kill_running_trace;
 static int stop_watch;
 static int piped_output;
@@ -1067,6 +1067,36 @@ static void close_client_connections(void)
 	}
 }
 
+static int setup_buts2(void)
+{
+	struct list_head *p;
+	int ret = 0;
+
+	__list_for_each(p, &devpaths) {
+		struct blk_user_trace_setup2 buts2;
+		struct devpath *dpp = list_entry(p, struct devpath, head);
+
+		memset(&buts2, 0, sizeof(buts2));
+		buts2.buf_size = buf_size;
+		buts2.buf_nr = buf_nr;
+		buts2.act_mask = act_mask;
+
+		if (ioctl(dpp->fd, BLKTRACESETUP2, &buts2) >= 0) {
+			dpp->ncpus = max_cpus;
+			dpp->buts_name = strdup(buts2.name);
+			dpp->setup_done = 1;
+			if (dpp->stats)
+				free(dpp->stats);
+			dpp->stats = calloc(dpp->ncpus, sizeof(*dpp->stats));
+			memset(dpp->stats, 0, dpp->ncpus * sizeof(*dpp->stats));
+		} else {
+			ret++;
+		}
+	}
+
+	return ret;
+}
+
 static int setup_buts(void)
 {
 	struct list_head *p;
@@ -2684,9 +2714,11 @@ static int run_tracers(void)
 	if (net_mode == Net_client)
 		printf("blktrace: connecting to %s\n", hostname);
 
-	if (setup_buts()) {
-		done = 1;
-		return 1;
+	if (setup_buts2()) {
+		if (setup_buts()) {
+			done = 1;
+			return 1;
+		}
 	}
 
 	if (use_tracer_devpaths()) {
-- 
2.51.0

Re: [PATCH 03/21] call BLKTRACESETUP2 ioctl per default to setup a trace

[Chaitanya Kulkarni]

On 9/9/25 04:07, Johannes Thumshirn wrote:

Call BLKTRACESETUP2 ioctl per default and if the kernel does not support
this ioctl because it is too old, fall back to calling BLKTRACESETUP.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
  blktrace.c | 40 ++++++++++++++++++++++++++++++++++++----
  1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/blktrace.c b/blktrace.c
index 038b2cb..72562fd 100644
--- a/blktrace.c
+++ b/blktrace.c
@@ -279,7 +279,7 @@ static int max_cpus;
  static int ncpus;
  static cpu_set_t *online_cpus;
  static int pagesize;
-static int act_mask = ~0U;
+static unsigned long long act_mask = ~0U;

~0ULL ?

  static int kill_running_trace;
  static int stop_watch;
  static int piped_output;
@@ -1067,6 +1067,36 @@ static void close_client_connections(void)
  	}
  }
  
+static int setup_buts2(void)
+{
+	struct list_head *p;
+	int ret = 0;
+
+	__list_for_each(p, &devpaths) {
+		struct blk_user_trace_setup2 buts2;
+		struct devpath *dpp = list_entry(p, struct devpath, head);
+
+		memset(&buts2, 0, sizeof(buts2));
+		buts2.buf_size = buf_size;
+		buts2.buf_nr = buf_nr;
+		buts2.act_mask = act_mask;
+

1. Original code (BLKTRACESETUP)
struct blk_user_trace_setup {
     char name[32];    /* output */
     __u16 act_mask;   /* input */
     ...
};
static int act_mask = ~0U;   /* global */

In handle_args():

     int act_mask_tmp;
     if (act_mask_tmp != 0)
         act_mask = act_mask_tmp;

     Later in setup_buts():
     buts.act_mask = act_mask;

Here everything lines up:
     handle_args() -> int act_mask_tmp
     act_mask (global) -> int
     buts.act_mask -> __u16

No truncation issues as long as the mask fits in 16 bits
(which it always did in the original design).

2. New code (BLKTRACESETUP2)
struct blk_user_trace_setup2 {
     char name[32];   /* output */
     __u64 act_mask;  /* input */
     ...
};

static unsigned long long act_mask = ~0U;  /* global changed */
     In handle_args() (still unchanged):

     int act_mask_tmp;
     if (act_mask_tmp != 0)
         act_mask = act_mask_tmp;

     Later in setup_buts2():
     buts2.act_mask = act_mask;

Here is the issue:
     handle_args() still uses int act_mask_tmp.
     global act_mask is now unsigned long long.
     buts2.act_mask is __u64.

above truncation of bits can lead to compiler/tools warnings ?

also if in the future|act_mask| uses bits above 31, they could
never be set because the input path (|int act_mask_tmp|) can’t
represent them ?

-ck

[PATCH 04/21] blktrace: change size of action to 64 bits

[Johannes Thumshirn]

In order to add the zoned commands to blktrace's actions, the storage size
needs to be increased to 64bits.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 act_mask.c     |  4 ++--
 blkparse.c     |  2 +-
 blkparse_fmt.c | 15 ++++++++-------
 blkrawverify.c | 10 +++++-----
 blktrace.h     |  2 +-
 5 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/act_mask.c b/act_mask.c
index 8f1b8d7..510c7e0 100644
--- a/act_mask.c
+++ b/act_mask.c
@@ -42,7 +42,7 @@ int find_mask_map(char *string)
 	return -1;
 }
 
-int valid_act_opt(int x)
+unsigned long long valid_act_opt(unsigned long long x)
 {
-	return (1 <= x) && (x < (1 << BLK_TC_SHIFT));
+	return (1ull <= x) && (x < (1ull << BLK_TC_SHIFT));
 }
diff --git a/blkparse.c b/blkparse.c
index d6aaa8b..c720af6 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -299,7 +299,7 @@ static int per_device_and_cpu_stats = 1;
 static int track_ios;
 static int ppi_hash_by_pid = 1;
 static int verbose;
-static unsigned int act_mask = -1U;
+static unsigned long long act_mask = -1U;
 static int stats_printed;
 static int bin_output_msgs = 1;
 int data_is_native = -1;
diff --git a/blkparse_fmt.c b/blkparse_fmt.c
index 9b83d1d..02c5a3c 100644
--- a/blkparse_fmt.c
+++ b/blkparse_fmt.c
@@ -8,6 +8,7 @@
 #include <unistd.h>
 #include <ctype.h>
 #include <time.h>
+#include <stdbool.h>
 
 #include "blktrace.h"
 
@@ -52,13 +53,13 @@ int add_format_spec(char *option)
 
 static inline void fill_rwbs(char *rwbs, struct blk_io_trace *t)
 {
-	int w = t->action & BLK_TC_ACT(BLK_TC_WRITE);
-	int a = t->action & BLK_TC_ACT(BLK_TC_AHEAD);
-	int s = t->action & BLK_TC_ACT(BLK_TC_SYNC);
-	int m = t->action & BLK_TC_ACT(BLK_TC_META);
-	int d = t->action & BLK_TC_ACT(BLK_TC_DISCARD);
-	int f = t->action & BLK_TC_ACT(BLK_TC_FLUSH);
-	int u = t->action & BLK_TC_ACT(BLK_TC_FUA);
+	bool w = !!(t->action & BLK_TC_ACT(BLK_TC_WRITE));
+	bool a = !!(t->action & BLK_TC_ACT(BLK_TC_AHEAD));
+	bool s = !!(t->action & BLK_TC_ACT(BLK_TC_SYNC));
+	bool m = !!(t->action & BLK_TC_ACT(BLK_TC_META));
+	bool d = !!(t->action & BLK_TC_ACT(BLK_TC_DISCARD));
+	bool f = !!(t->action & BLK_TC_ACT(BLK_TC_FLUSH));
+	bool u = !!(t->action & BLK_TC_ACT(BLK_TC_FUA));
 	int i = 0;
 
 	if (f)
diff --git a/blkrawverify.c b/blkrawverify.c
index ed5d258..9c5d595 100644
--- a/blkrawverify.c
+++ b/blkrawverify.c
@@ -55,7 +55,7 @@ static struct trace_info traces[] = {
 #define N_TRACES (sizeof(traces) / sizeof(struct trace_info))
 
 struct act_info {
-	__u32 val;
+	__u64 val;
 	char *string;
 };
 
@@ -80,12 +80,12 @@ static struct act_info acts[] = {
 };
 #define N_ACTS (sizeof(acts) / sizeof(struct act_info))
 
-static char *act_to_str(__u32 action)
+static char *act_to_str(__u64 action)
 {
 	static char buf[1024];
 	unsigned int i;
-	unsigned int act = action & 0xffff;
-	unsigned int trace = (action >> BLK_TC_SHIFT) & 0xffff;
+	unsigned long long act = action & 0xffffffff;
+	unsigned long long trace = (action >> BLK_TC_SHIFT) & 0xffffffff;
 
 	if (act < N_ACTS) {
 		sprintf(buf, "%s ", acts[act].string);
@@ -97,7 +97,7 @@ static char *act_to_str(__u32 action)
 			}
 	}
 	else
-		sprintf(buf, "Invalid action=%08x", action);
+		sprintf(buf, "Invalid action=%016llx", action);
 
 	return buf;
 }
diff --git a/blktrace.h b/blktrace.h
index 944fc08..74dfb48 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -144,7 +144,7 @@ extern void set_all_format_specs(char *);
 extern int add_format_spec(char *);
 extern void process_fmt(char *, struct per_cpu_info *, struct blk_io_trace *,
 			unsigned long long, int, unsigned char *);
-extern int valid_act_opt(int);
+extern unsigned long long valid_act_opt(unsigned long long);
 extern int find_mask_map(char *);
 extern char *find_process_name(pid_t);
 
-- 
2.51.0

[PATCH 05/21] blktrace: add definitions for blk_io_trace2

[Johannes Thumshirn]

Add 'struct blk_io_trace2' which represents the extended version of the
blktrace protocol.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blktrace_api.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/blktrace_api.h b/blktrace_api.h
index 9f435a5..bbf075f 100644
--- a/blktrace_api.h
+++ b/blktrace_api.h
@@ -27,8 +27,19 @@ enum {
 	BLK_TC_END	= 1 << 15,	/* we've run out of bits! */
 };
 
+enum blktrace_cat2 {
+	BLK_TC_ZONE_APPEND      = 1 << 1ull,    /* zone append */
+	BLK_TC_ZONE_RESET       = 1 << 2ull,    /* zone reset */
+	BLK_TC_ZONE_RESET_ALL   = 1 << 3ull,    /* zone reset all */
+	BLK_TC_ZONE_FINISH      = 1 << 4ull,    /* zone finish */
+	BLK_TC_ZONE_OPEN        = 1 << 5ull,    /* zone open */
+	BLK_TC_ZONE_CLOSE       = 1 << 6ull,    /* zone close */
+};
+
 #define BLK_TC_SHIFT		(16)
 #define BLK_TC_ACT(act)		((act) << BLK_TC_SHIFT)
+#define BLK_TC_SHIFT2           (32)
+#define BLK_TC_ACT2(act)        ((__u64)(act) << BLK_TC_SHIFT2)
 
 /*
  * Basic trace actions
@@ -51,6 +62,7 @@ enum {
 	__BLK_TA_REMAP,			/* bio was remapped */
 	__BLK_TA_ABORT,			/* request aborted */
 	__BLK_TA_DRV_DATA,		/* binary driver data */
+	__BLK_TA_ZONE_MGMT,		/* zone management command was issued */
 	__BLK_TA_CGROUP = 1 << 8,
 };
 
@@ -85,12 +97,20 @@ enum blktrace_notify {
 #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_TA_ZONE_APPEND      (__BLK_TA_COMPLETE |\
+				 BLK_TC_ACT2(BLK_TC_ZONE_APPEND))
+#define BLK_TA_ZONE_MGMT        __BLK_TA_ZONE_MGMT
+#define BLK_TA_ZONE_PLUG        (__BLK_TA_ZONE_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_ZONE_UNPLUG      (__BLK_TA_ZONE_UNPLUG |\
+				 BLK_TC_ACT(BLK_TC_QUEUE))
+
 #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
+#define BLK_IO_TRACE2_VERSION	0x08
 
 /*
  * The trace itself
@@ -118,6 +138,21 @@ struct blk_io_trace_remap {
 	__u64 sector_from;
 };
 
+struct blk_io_trace2 {
+	__u32 magic;            /* MAGIC << 8 | BLK_IO_TRACE2_VERSION */
+	__u32 sequence;         /* event number */
+	__u64 time;             /* in nanoseconds */
+	__u64 sector;           /* disk offset */
+	__u32 bytes;            /* transfer length */
+	__u32 pid;              /* who did it */
+	__u64 action;           /* what happened */
+	__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 */
+};
+
 /*
  * Payload with originating cgroup info
  */
-- 
2.51.0

[PATCH 06/21] blktrace: support protocol version 8

[Johannes Thumshirn]

Also support protocol version 8 in conjunction with protocol version 7.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blktrace.h | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/blktrace.h b/blktrace.h
index 74dfb48..3305fa0 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -69,6 +69,7 @@ extern struct timespec abs_start_time;
 
 #define CHECK_MAGIC(t)		(((t)->magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
 #define SUPPORTED_VERSION	(0x07)
+#define SUPPORTED_VERSION2	(0x08)
 
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 #define be16_to_cpu(x)		__bswap_16(x)
@@ -90,13 +91,17 @@ extern struct timespec abs_start_time;
 
 static inline int verify_trace(struct blk_io_trace *t)
 {
+	u8 version;
+
 	if (!CHECK_MAGIC(t)) {
 		fprintf(stderr, "bad trace magic %x\n", t->magic);
 		return 1;
 	}
-	if ((t->magic & 0xff) != SUPPORTED_VERSION) {
-		fprintf(stderr, "unsupported trace version %x\n", 
-			t->magic & 0xff);
+
+	version = t->magic & 0xff;
+	if (version != SUPPORTED_VERSION &&
+	    version != SUPPORTED_VERSION2) {
+		fprintf(stderr, "unsupported trace version %x\n", version);
 		return 1;
 	}
 
-- 
2.51.0

[PATCH 07/21] blkparse: pass magic to get_magic

[Johannes Thumshirn]

Pass the magic value to get_magic() instead of the whole 'struct
blk_io_trace'.

This is a preparation for distinguishing between two different types of
blktrace protocol versions in blkparse.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/blkparse.c b/blkparse.c
index c720af6..03df2a7 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2420,12 +2420,12 @@ static inline __u16 get_pdulen(struct blk_io_trace *bit)
 	return __bswap_16(bit->pdu_len);
 }
 
-static inline __u32 get_magic(struct blk_io_trace *bit)
+static inline __u32 get_magic(__u32 magic)
 {
 	if (data_is_native)
-		return bit->magic;
+		return magic;
 
-	return __bswap_32(bit->magic);
+	return __bswap_32(magic);
 }
 
 static int read_events(int fd, int always_block, int *fdblock)
@@ -2458,7 +2458,7 @@ static int read_events(int fd, int always_block, int *fdblock)
 		if (data_is_native == -1 && check_data_endianness(bit->magic))
 			break;
 
-		magic = get_magic(bit);
+		magic = get_magic(bit->magic);
 		if ((magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
 			fprintf(stderr, "Bad magic %x\n", magic);
 			break;
@@ -2604,7 +2604,7 @@ static int ms_prime(struct ms_stream *msp)
 		if (data_is_native == -1 && check_data_endianness(bit->magic))
 			goto err;
 
-		magic = get_magic(bit);
+		magic = get_magic(bit->magic);
 		if ((magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
 			fprintf(stderr, "Bad magic %x\n", magic);
 			goto err;
-- 
2.51.0

[PATCH 08/21] blkparse: read 'magic' first

[Johannes Thumshirn]

Read the 'magic' portion of 'struct blk_io_trace' first when reading the
tracefile and only if all magic checks succeed, read the rest of the
trace.

This is a preparation of supporting multiple trace protocol versions.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c | 44 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/blkparse.c b/blkparse.c
index 03df2a7..8381e20 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2438,14 +2438,13 @@ static int read_events(int fd, int always_block, int *fdblock)
 		struct trace *t;
 		int pdu_len, should_block, ret;
 		__u32 magic;
-
-		bit = bit_alloc();
+		void *p;
 
 		should_block = !events || always_block;
 
-		ret = read_data(fd, bit, sizeof(*bit), should_block, fdblock);
+		ret = read_data(fd, &magic, sizeof(magic), should_block,
+				fdblock);
 		if (ret) {
-			bit_free(bit);
 			if (!events && ret < 0)
 				events = ret;
 			break;
@@ -2455,15 +2454,28 @@ static int read_events(int fd, int always_block, int *fdblock)
 		 * look at first trace to check whether we need to convert
 		 * data in the future
 		 */
-		if (data_is_native == -1 && check_data_endianness(bit->magic))
+		if (data_is_native == -1 && check_data_endianness(magic))
 			break;
 
-		magic = get_magic(bit->magic);
+		magic = get_magic(magic);
 		if ((magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
 			fprintf(stderr, "Bad magic %x\n", magic);
 			break;
 		}
 
+		bit = bit_alloc();
+		bit->magic = magic;
+		p = (void *) ((u8 *)bit + sizeof(magic));
+
+		ret = read_data(fd, p, sizeof(*bit) - sizeof(magic),
+				should_block, fdblock);
+		if (ret) {
+			bit_free(bit);
+			if (!events && ret < 0)
+				events = ret;
+			break;
+		}
+
 		pdu_len = get_pdulen(bit);
 		if (pdu_len) {
 			void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
@@ -2596,20 +2608,30 @@ static int ms_prime(struct ms_stream *msp)
 	int ret, pdu_len, ndone = 0;
 
 	for (i = 0; !is_done() && pci->fd >= 0 && i < rb_batch; i++) {
-		bit = bit_alloc();
-		ret = read_data(pci->fd, bit, sizeof(*bit), 1, &pci->fdblock);
+		void *p;
+
+		ret = read_data(pci->fd, &magic, sizeof(magic), 1,
+				&pci->fdblock);
 		if (ret)
 			goto err;
 
-		if (data_is_native == -1 && check_data_endianness(bit->magic))
+		if (data_is_native == -1 && check_data_endianness(magic))
 			goto err;
 
-		magic = get_magic(bit->magic);
+		magic = get_magic(magic);
 		if ((magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
 			fprintf(stderr, "Bad magic %x\n", magic);
 			goto err;
 
 		}
+		bit = bit_alloc();
+		bit->magic = magic;
+		p = (void *) ((u8 *)bit + sizeof(magic));
+
+		ret = read_data(pci->fd, p, sizeof(*bit) - sizeof(magic), 1,
+				&pci->fdblock);
+		if (ret)
+			goto err;
 
 		pdu_len = get_pdulen(bit);
 		if (pdu_len) {
@@ -2639,6 +2661,7 @@ static int ms_prime(struct ms_stream *msp)
 			handle_notify(bit);
 			output_binary(bit, sizeof(*bit) + bit->pdu_len);
 			bit_free(bit);
+			bit = NULL;
 
 			i -= 1;
 			continue;
@@ -2659,6 +2682,7 @@ static int ms_prime(struct ms_stream *msp)
 		}
 
 		ndone++;
+		bit = NULL;
 	}
 
 	return ndone;
-- 
2.51.0

[PATCH 09/21] blkparse: factor out reading of a singe blk_io_trace event

[Johannes Thumshirn]

Factor out reading a single blk_io_trace event. This de-duplicates code
and also prepares for expansion with new trace protocol versions.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c | 78 ++++++++++++++++++++++++------------------------------
 1 file changed, 34 insertions(+), 44 deletions(-)

diff --git a/blkparse.c b/blkparse.c
index 8381e20..5d5cd48 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2428,6 +2428,34 @@ static inline __u32 get_magic(__u32 magic)
 	return __bswap_32(magic);
 }
 
+static int read_one_bit(int fd, struct blk_io_trace *bit, int block,
+			int *fdblock)
+{
+	int ret;
+	int pdu_len;
+	void *p = (void *) ((u8 *)bit + sizeof(__u32));
+
+	ret = read_data(fd, p, sizeof(*bit) - sizeof(__u32), block, fdblock);
+	if (ret)
+		return ret;
+
+	pdu_len = get_pdulen(bit);
+	if (pdu_len) {
+		void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
+
+		ret = read_data(fd, ptr + sizeof(*bit), pdu_len, 1, fdblock);
+		if (ret) {
+			free(ptr);
+			return ret;
+		}
+		bit = ptr;
+	}
+
+	trace_to_cpu(bit);
+
+	return 0;
+}
+
 static int read_events(int fd, int always_block, int *fdblock)
 {
 	struct per_dev_info *pdi = NULL;
@@ -2436,9 +2464,8 @@ static int read_events(int fd, int always_block, int *fdblock)
 	while (!is_done() && events < rb_batch) {
 		struct blk_io_trace *bit;
 		struct trace *t;
-		int pdu_len, should_block, ret;
+		int should_block, ret;
 		__u32 magic;
-		void *p;
 
 		should_block = !events || always_block;
 
@@ -2465,33 +2492,14 @@ static int read_events(int fd, int always_block, int *fdblock)
 
 		bit = bit_alloc();
 		bit->magic = magic;
-		p = (void *) ((u8 *)bit + sizeof(magic));
 
-		ret = read_data(fd, p, sizeof(*bit) - sizeof(magic),
-				should_block, fdblock);
-		if (ret) {
-			bit_free(bit);
-			if (!events && ret < 0)
-				events = ret;
+		ret = read_one_bit(fd, bit, 1, fdblock);
+		if (ret)
 			break;
-		}
-
-		pdu_len = get_pdulen(bit);
-		if (pdu_len) {
-			void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
-
-			if (read_data(fd, ptr + sizeof(*bit), pdu_len, 1, fdblock)) {
-				bit_free(ptr);
-				break;
-			}
-
-			bit = ptr;
-		}
-
-		trace_to_cpu(bit);
 
 		if (verify_trace(bit)) {
 			bit_free(bit);
+			bit = NULL;
 			continue;
 		}
 
@@ -2605,10 +2613,9 @@ static int ms_prime(struct ms_stream *msp)
 	struct per_dev_info *pdi = msp->pdi;
 	struct per_cpu_info *pci = get_cpu_info(pdi, msp->cpu);
 	struct blk_io_trace *bit = NULL;
-	int ret, pdu_len, ndone = 0;
+	int ret, ndone = 0;
 
 	for (i = 0; !is_done() && pci->fd >= 0 && i < rb_batch; i++) {
-		void *p;
 
 		ret = read_data(pci->fd, &magic, sizeof(magic), 1,
 				&pci->fdblock);
@@ -2626,28 +2633,11 @@ static int ms_prime(struct ms_stream *msp)
 		}
 		bit = bit_alloc();
 		bit->magic = magic;
-		p = (void *) ((u8 *)bit + sizeof(magic));
 
-		ret = read_data(pci->fd, p, sizeof(*bit) - sizeof(magic), 1,
-				&pci->fdblock);
+		ret = read_one_bit(pci->fd, bit, 1, &pci->fdblock);
 		if (ret)
 			goto err;
 
-		pdu_len = get_pdulen(bit);
-		if (pdu_len) {
-			void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
-			ret = read_data(pci->fd, ptr + sizeof(*bit), pdu_len,
-							     1, &pci->fdblock);
-			if (ret) {
-				free(ptr);
-				bit = NULL;
-				goto err;
-			}
-
-			bit = ptr;
-		}
-
-		trace_to_cpu(bit);
 		if (verify_trace(bit))
 			goto err;
 
-- 
2.51.0

[PATCH 10/21] blkparse: skip unsupported protocol versions

[Johannes Thumshirn]

Skip unsupported protocol versions for now.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c | 136 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 76 insertions(+), 60 deletions(-)

diff --git a/blkparse.c b/blkparse.c
index 5d5cd48..0873c13 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2462,10 +2462,10 @@ static int read_events(int fd, int always_block, int *fdblock)
 	unsigned int events = 0;
 
 	while (!is_done() && events < rb_batch) {
-		struct blk_io_trace *bit;
 		struct trace *t;
 		int should_block, ret;
 		__u32 magic;
+		u8 version;
 
 		should_block = !events || always_block;
 
@@ -2489,42 +2489,50 @@ static int read_events(int fd, int always_block, int *fdblock)
 			fprintf(stderr, "Bad magic %x\n", magic);
 			break;
 		}
+		version = magic & 0xff;
+		if (version == SUPPORTED_VERSION) {
+			struct blk_io_trace *bit;
+			bit = bit_alloc();
+			bit->magic = magic;
 
-		bit = bit_alloc();
-		bit->magic = magic;
+			ret = read_one_bit(fd, bit, 1, fdblock);
+			if (ret)
+				break;
 
-		ret = read_one_bit(fd, bit, 1, fdblock);
-		if (ret)
-			break;
+			/*
+			 * not a real trace, so grab and handle it here
+			 */
+			if (bit->action & BLK_TC_ACT(BLK_TC_NOTIFY) &&
+			    (bit->action & ~__BLK_TN_CGROUP) != BLK_TN_MESSAGE) {
+				handle_notify(bit);
+				output_binary(bit, sizeof(*bit) + bit->pdu_len);
+				continue;
+			}
 
-		if (verify_trace(bit)) {
-			bit_free(bit);
-			bit = NULL;
-			continue;
-		}
+			if (verify_trace(bit)) {
+				bit_free(bit);
+				bit = NULL;
+				continue;
+			}
 
-		/*
-		 * not a real trace, so grab and handle it here
-		 */
-		if (bit->action & BLK_TC_ACT(BLK_TC_NOTIFY) && (bit->action & ~__BLK_TN_CGROUP) != BLK_TN_MESSAGE) {
-			handle_notify(bit);
-			output_binary(bit, sizeof(*bit) + bit->pdu_len);
-			continue;
-		}
+			t = t_alloc();
+			memset(t, 0, sizeof(*t));
+			t->bit = bit;
+			t->read_sequence = read_sequence;
 
-		t = t_alloc();
-		memset(t, 0, sizeof(*t));
-		t->bit = bit;
-		t->read_sequence = read_sequence;
+			t->next = trace_list;
+			trace_list = t;
 
-		t->next = trace_list;
-		trace_list = t;
+			if (!pdi || pdi->dev != bit->device)
+				pdi = get_dev_info(bit->device);
 
-		if (!pdi || pdi->dev != bit->device)
-			pdi = get_dev_info(bit->device);
+			if (bit->time > pdi->last_read_time)
+				pdi->last_read_time = bit->time;
+		} else {
+			fprintf(stderr, "unsupported version %d\n", version);
+			continue;
+		}
 
-		if (bit->time > pdi->last_read_time)
-			pdi->last_read_time = bit->time;
 
 		events++;
 	}
@@ -2616,6 +2624,7 @@ static int ms_prime(struct ms_stream *msp)
 	int ret, ndone = 0;
 
 	for (i = 0; !is_done() && pci->fd >= 0 && i < rb_batch; i++) {
+		u8 version;
 
 		ret = read_data(pci->fd, &magic, sizeof(magic), 1,
 				&pci->fdblock);
@@ -2631,46 +2640,53 @@ static int ms_prime(struct ms_stream *msp)
 			goto err;
 
 		}
-		bit = bit_alloc();
-		bit->magic = magic;
+		version = magic & 0xff;
+		if (version == SUPPORTED_VERSION) {
+			bit = bit_alloc();
+			bit->magic = magic;
 
-		ret = read_one_bit(pci->fd, bit, 1, &pci->fdblock);
-		if (ret)
-			goto err;
+			ret = read_one_bit(pci->fd, bit, 1, &pci->fdblock);
+			if (ret)
+				goto err;
 
-		if (verify_trace(bit))
-			goto err;
+			if (verify_trace(bit))
+				goto err;
 
-		if (bit->cpu != pci->cpu) {
-			fprintf(stderr, "cpu %d trace info has error cpu %d\n",
-				pci->cpu, bit->cpu);
-			continue;
-		}
+			if (bit->cpu != pci->cpu) {
+				fprintf(stderr,
+					"cpu %d trace info has error cpu %d\n",
+					pci->cpu, bit->cpu);
+				continue;
+			}
 
-		if (bit->action & BLK_TC_ACT(BLK_TC_NOTIFY) && (bit->action & ~__BLK_TN_CGROUP) != BLK_TN_MESSAGE) {
-			handle_notify(bit);
-			output_binary(bit, sizeof(*bit) + bit->pdu_len);
-			bit_free(bit);
-			bit = NULL;
+			if (bit->action & BLK_TC_ACT(BLK_TC_NOTIFY) &&
+			    (bit->action & ~__BLK_TN_CGROUP) != BLK_TN_MESSAGE) {
+				handle_notify(bit);
+				output_binary(bit, sizeof(*bit) + bit->pdu_len);
+				bit_free(bit);
+				bit = NULL;
 
-			i -= 1;
-			continue;
-		}
+				i -= 1;
+				continue;
+			}
 
-		if (bit->time > pdi->last_read_time)
-			pdi->last_read_time = bit->time;
+			if (bit->time > pdi->last_read_time)
+				pdi->last_read_time = bit->time;
 
-		t = t_alloc();
-		memset(t, 0, sizeof(*t));
-		t->bit = bit;
+			t = t_alloc();
+			memset(t, 0, sizeof(*t));
+			t->bit = bit;
 
-		if (msp->first == NULL)
-			msp->first = msp->last = t;
-		else {
-			msp->last->next = t;
-			msp->last = t;
+			if (msp->first == NULL)
+				msp->first = msp->last = t;
+			else {
+				msp->last->next = t;
+				msp->last = t;
+			}
+		} else {
+			fprintf(stderr, "unsupported version %d\n", version);
+			continue;
 		}
-
 		ndone++;
 		bit = NULL;
 	}
-- 
2.51.0

[PATCH 11/21] blkparse: make get_pdulen() take the pdu_len

[Johannes Thumshirn]

Directly pass in the pdu_len into get_pdulen() and only care about the
byte swapping in get_pdulen().

This enables us to use the function for different versions of the
protocol.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/blkparse.c b/blkparse.c
index 0873c13..3609ca9 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2412,12 +2412,12 @@ static int read_data(int fd, void *buffer, int bytes, int block, int *fdblock)
 	return 0;
 }
 
-static inline __u16 get_pdulen(struct blk_io_trace *bit)
+static inline __u16 get_pdulen(__u16 pdu_len)
 {
 	if (data_is_native)
-		return bit->pdu_len;
+		return pdu_len;
 
-	return __bswap_16(bit->pdu_len);
+	return __bswap_16(pdu_len);
 }
 
 static inline __u32 get_magic(__u32 magic)
@@ -2439,7 +2439,7 @@ static int read_one_bit(int fd, struct blk_io_trace *bit, int block,
 	if (ret)
 		return ret;
 
-	pdu_len = get_pdulen(bit);
+	pdu_len = get_pdulen(bit->pdu_len);
 	if (pdu_len) {
 		void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
 
-- 
2.51.0

[PATCH 12/21] blkiomon: read 'magic' first

[Johannes Thumshirn]

Similar to blkparse, read the 'magic' portion of 'struct blk_io_trace'
first when reading the trace.

This is a preparation of supporting multiple trace protocol versions.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkiomon.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/blkiomon.c b/blkiomon.c
index f8b0c9d..05f2d00 100644
--- a/blkiomon.c
+++ b/blkiomon.c
@@ -460,19 +460,28 @@ static int blkiomon_do_fifo(void)
 	bit = &t->bit;
 
 	while (up) {
+		__u32 magic;
+
+		if (fread(&magic, sizeof(magic), 1, ifp) != 1) {
+			if (!feof(ifp))
+				fprintf(stderr,
+					"blkiomon: could not read trace");
+			break;
+		}
 		if (fread(bit, sizeof(*bit), 1, ifp) != 1) {
 			if (!feof(ifp))
 				fprintf(stderr,
 					"blkiomon: could not read trace");
 			break;
 		}
+		bit->magic = magic;
 		if (ferror(ifp)) {
 			clearerr(ifp);
 			fprintf(stderr, "blkiomon: error while reading trace");
 			break;
 		}
 
-		if (data_is_native == -1 && check_data_endianness(bit->magic)) {
+		if (data_is_native == -1 && check_data_endianness(magic)) {
 			fprintf(stderr, "blkiomon: endianess problem\n");
 			break;
 		}
-- 
2.51.0

[PATCH 13/21] blktrace: pass magic to CHECK_MAGIC macro

[Johannes Thumshirn]

Pass only the magic number itself to the CHECK_MAGIC() macro.

This enables support for multiple versions.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkrawverify.c | 2 +-
 blktrace.h     | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/blkrawverify.c b/blkrawverify.c
index 9c5d595..cc5b06e 100644
--- a/blkrawverify.c
+++ b/blkrawverify.c
@@ -183,7 +183,7 @@ static int process(FILE **fp, char *devname, char *file, unsigned int cpu)
 
 		trace_to_cpu(bit);
 
-		if (!CHECK_MAGIC(bit)) {
+		if (!CHECK_MAGIC(bit->magic)) {
 			INC_BAD("bad trace");
 			continue;
 		}
diff --git a/blktrace.h b/blktrace.h
index 3305fa0..81a5b51 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -67,7 +67,7 @@ extern FILE *ofp;
 extern int data_is_native;
 extern struct timespec abs_start_time;
 
-#define CHECK_MAGIC(t)		(((t)->magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
+#define CHECK_MAGIC(magic)		(((magic) & 0xffffff00) == BLK_IO_TRACE_MAGIC)
 #define SUPPORTED_VERSION	(0x07)
 #define SUPPORTED_VERSION2	(0x08)
 
@@ -93,7 +93,7 @@ static inline int verify_trace(struct blk_io_trace *t)
 {
 	u8 version;
 
-	if (!CHECK_MAGIC(t)) {
+	if (!CHECK_MAGIC(t->magic)) {
 		fprintf(stderr, "bad trace magic %x\n", t->magic);
 		return 1;
 	}
-- 
2.51.0

[PATCH 14/21] blktrace: pass magic to verify_trace

[Johannes Thumshirn]

Pass magic to verify_trace(), this will enable verification of multiple
supported versions.

Singed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkiomon.c | 2 +-
 blkparse.c | 4 ++--
 blktrace.h | 8 ++++----
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/blkiomon.c b/blkiomon.c
index 05f2d00..373947e 100644
--- a/blkiomon.c
+++ b/blkiomon.c
@@ -488,7 +488,7 @@ static int blkiomon_do_fifo(void)
 
 		/* endianess */
 		trace_to_cpu(bit);
-		if (verify_trace(bit)) {
+		if (verify_trace(bit->magic)) {
 			fprintf(stderr, "blkiomon: bad trace\n");
 			break;
 		}
diff --git a/blkparse.c b/blkparse.c
index 3609ca9..cc62dcf 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2509,7 +2509,7 @@ static int read_events(int fd, int always_block, int *fdblock)
 				continue;
 			}
 
-			if (verify_trace(bit)) {
+			if (verify_trace(bit->magic)) {
 				bit_free(bit);
 				bit = NULL;
 				continue;
@@ -2649,7 +2649,7 @@ static int ms_prime(struct ms_stream *msp)
 			if (ret)
 				goto err;
 
-			if (verify_trace(bit))
+			if (verify_trace(bit->magic))
 				goto err;
 
 			if (bit->cpu != pci->cpu) {
diff --git a/blktrace.h b/blktrace.h
index 81a5b51..68c67f2 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -89,16 +89,16 @@ extern struct timespec abs_start_time;
 #error "Bad arch"
 #endif
 
-static inline int verify_trace(struct blk_io_trace *t)
+static inline int verify_trace(__u32 magic)
 {
 	u8 version;
 
-	if (!CHECK_MAGIC(t->magic)) {
-		fprintf(stderr, "bad trace magic %x\n", t->magic);
+	if (!CHECK_MAGIC(magic)) {
+		fprintf(stderr, "bad trace magic %x\n", magic);
 		return 1;
 	}
 
-	version = t->magic & 0xff;
+	version = magic & 0xff;
 	if (version != SUPPORTED_VERSION &&
 	    version != SUPPORTED_VERSION2) {
 		fprintf(stderr, "unsupported trace version %x\n", version);
-- 
2.51.0

[PATCH 15/21] blktrace: rename trace_to_cpu to bit_trace_to_cpu

[Johannes Thumshirn]

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkiomon.c     | 2 +-
 blkparse.c     | 2 +-
 blkrawverify.c | 2 +-
 blktrace.h     | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/blkiomon.c b/blkiomon.c
index 373947e..9defa2c 100644
--- a/blkiomon.c
+++ b/blkiomon.c
@@ -487,7 +487,7 @@ static int blkiomon_do_fifo(void)
 		}
 
 		/* endianess */
-		trace_to_cpu(bit);
+		bit_trace_to_cpu(bit);
 		if (verify_trace(bit->magic)) {
 			fprintf(stderr, "blkiomon: bad trace\n");
 			break;
diff --git a/blkparse.c b/blkparse.c
index cc62dcf..068c4b2 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2451,7 +2451,7 @@ static int read_one_bit(int fd, struct blk_io_trace *bit, int block,
 		bit = ptr;
 	}
 
-	trace_to_cpu(bit);
+	bit_trace_to_cpu(bit);
 
 	return 0;
 }
diff --git a/blkrawverify.c b/blkrawverify.c
index cc5b06e..8e863cb 100644
--- a/blkrawverify.c
+++ b/blkrawverify.c
@@ -181,7 +181,7 @@ static int process(FILE **fp, char *devname, char *file, unsigned int cpu)
 		if (data_is_native == -1)
 			check_data_endianness(bit->magic);
 
-		trace_to_cpu(bit);
+		bit_trace_to_cpu(bit);
 
 		if (!CHECK_MAGIC(bit->magic)) {
 			INC_BAD("bad trace");
diff --git a/blktrace.h b/blktrace.h
index 68c67f2..08ac28b 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -108,7 +108,7 @@ static inline int verify_trace(__u32 magic)
 	return 0;
 }
 
-static inline void trace_to_cpu(struct blk_io_trace *t)
+static inline void bit_trace_to_cpu(struct blk_io_trace *t)
 {
 	if (data_is_native)
 		return;
-- 
2.51.0

[PATCH 16/21] blkparse: use blk_io_trace2 internally

[Johannes Thumshirn]

Use 'struct blk_io_trace2' as internal representation for a captured
blktrace.

This implies the conversion of 'struct blk_io_trace' into 'struct
blk_io_trace2' when reading the trace from the binary file.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c     | 131 +++++++++++++++++++++++++++----------------------
 blkparse_fmt.c |  16 +++---
 blktrace.h     |  23 ++++++++-
 3 files changed, 103 insertions(+), 67 deletions(-)

diff --git a/blkparse.c b/blkparse.c
index 068c4b2..1237c02 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -243,7 +243,7 @@ static struct option l_opts[] = {
  * for sorting the displayed output
  */
 struct trace {
-	struct blk_io_trace *bit;
+	struct blk_io_trace2 *bit;
 	struct rb_node rb_node;
 	struct trace *next;
 	unsigned long read_sequence;
@@ -257,7 +257,7 @@ static struct trace *trace_list;
 /*
  * allocation cache
  */
-static struct blk_io_trace *bit_alloc_list;
+static struct blk_io_trace2 *bit_alloc_list;
 static struct trace *t_alloc_list;
 
 /*
@@ -332,7 +332,7 @@ static int have_drv_data = 0;
 #define CPU_IDX(cpu)	((cpu) / CPUS_PER_LONG)
 #define CPU_BIT(cpu)	((cpu) & (CPUS_PER_LONG - 1))
 
-static void io_warn_unless(struct blk_io_trace *t, int condition,
+static void io_warn_unless(struct blk_io_trace2 *t, int condition,
 			   const char *fmt, ...)
 {
 	va_list ap;
@@ -613,7 +613,7 @@ static struct process_pid_map *add_ppm_hash(pid_t pid, const char *name)
 	return ppm;
 }
 
-static void handle_notify(struct blk_io_trace *bit)
+static void handle_notify(struct blk_io_trace2 *bit)
 {
 	void	*payload = (caddr_t) bit + sizeof(*bit);
 	__u32	two32[2];
@@ -802,25 +802,25 @@ static inline struct trace *t_alloc(void)
 	return malloc(sizeof(*t));
 }
 
-static inline void bit_free(struct blk_io_trace *bit)
+static inline void bit_free(struct blk_io_trace2 *bit)
 {
 	if (bit_alloc_cache < 1024 && !bit->pdu_len) {
 		/*
 		 * abuse a 64-bit field for a next pointer for the free item
 		 */
 		bit->time = (__u64) (unsigned long) bit_alloc_list;
-		bit_alloc_list = (struct blk_io_trace *) bit;
+		bit_alloc_list = (struct blk_io_trace2 *) bit;
 		bit_alloc_cache++;
 	} else
 		free(bit);
 }
 
-static inline struct blk_io_trace *bit_alloc(void)
+static inline struct blk_io_trace2 *bit_alloc(void)
 {
-	struct blk_io_trace *bit = bit_alloc_list;
+	struct blk_io_trace2 *bit = bit_alloc_list;
 
 	if (bit) {
-		bit_alloc_list = (struct blk_io_trace *) (unsigned long) \
+		bit_alloc_list = (struct blk_io_trace2 *) (unsigned long) \
 				 bit->time;
 		bit_alloc_cache--;
 		return bit;
@@ -1041,7 +1041,7 @@ static struct io_track *find_track(struct per_dev_info *pdi, pid_t pid,
 }
 
 static void log_track_frontmerge(struct per_dev_info *pdi,
-				 struct blk_io_trace *t)
+				 struct blk_io_trace2 *t)
 {
 	struct io_track *iot;
 
@@ -1062,7 +1062,7 @@ static void log_track_frontmerge(struct per_dev_info *pdi,
 	track_rb_insert(pdi, iot);
 }
 
-static void log_track_getrq(struct per_dev_info *pdi, struct blk_io_trace *t)
+static void log_track_getrq(struct per_dev_info *pdi, struct blk_io_trace2 *t)
 {
 	struct io_track *iot;
 	struct io_track_req *req;
@@ -1081,7 +1081,7 @@ static void log_track_getrq(struct per_dev_info *pdi, struct blk_io_trace *t)
  * for md/dm setups, the interesting cycle is Q -> C. So track queueing
  * time here, as dispatch time
  */
-static void log_track_queue(struct per_dev_info *pdi, struct blk_io_trace *t)
+static void log_track_queue(struct per_dev_info *pdi, struct blk_io_trace2 *t)
 {
 	struct io_track *iot;
 	struct io_track_req *req;
@@ -1096,7 +1096,7 @@ static void log_track_queue(struct per_dev_info *pdi, struct blk_io_trace *t)
 	req->dispatch_time = t->time;
 }
 
-static void log_track_split(struct per_dev_info *pdi, struct blk_io_trace *t)
+static void log_track_split(struct per_dev_info *pdi, struct blk_io_trace2 *t)
 {
 	struct io_track *iot, *split;
 
@@ -1118,7 +1118,7 @@ static void log_track_split(struct per_dev_info *pdi, struct blk_io_trace *t)
  * return time between rq allocation and insertion
  */
 static unsigned long long log_track_insert(struct per_dev_info *pdi,
-					   struct blk_io_trace *t)
+					   struct blk_io_trace2 *t)
 {
 	unsigned long long elapsed;
 	struct io_track *iot;
@@ -1153,7 +1153,7 @@ static unsigned long long log_track_insert(struct per_dev_info *pdi,
  * return time between queue and issue
  */
 static unsigned long long log_track_issue(struct per_dev_info *pdi,
-					  struct blk_io_trace *t)
+					  struct blk_io_trace2 *t)
 {
 	unsigned long long elapsed = -1ULL;
 	struct io_track *iot;
@@ -1191,7 +1191,7 @@ static unsigned long long log_track_issue(struct per_dev_info *pdi,
 	return elapsed;
 }
 
-static void fixup_complete(struct per_dev_info *pdi, struct blk_io_trace *t)
+static void fixup_complete(struct per_dev_info *pdi, struct blk_io_trace2 *t)
 {
 	struct io_track *iot;
 	__u64 start_sector;
@@ -1214,7 +1214,7 @@ static void fixup_complete(struct per_dev_info *pdi, struct blk_io_trace *t)
  * return time between dispatch and complete
  */
 static unsigned long long log_track_complete(struct per_dev_info *pdi,
-					     struct blk_io_trace *t)
+					     struct blk_io_trace2 *t)
 {
 	unsigned long long elapsed = -1ULL;
 	struct io_track *iot, *next;
@@ -1288,7 +1288,7 @@ static char *get_dev_name(struct per_dev_info *pdi, char *buffer, int size)
 	return buffer;
 }
 
-static void check_time(struct per_dev_info *pdi, struct blk_io_trace *bit)
+static void check_time(struct per_dev_info *pdi, struct blk_io_trace2 *bit)
 {
 	unsigned long long this = bit->time;
 	unsigned long long last = pdi->last_reported_time;
@@ -1297,7 +1297,7 @@ static void check_time(struct per_dev_info *pdi, struct blk_io_trace *bit)
 	pdi->last_reported_time = this;
 }
 
-static inline void __account_m(struct io_stats *ios, struct blk_io_trace *t,
+static inline void __account_m(struct io_stats *ios, struct blk_io_trace2 *t,
 			       int rw)
 {
 	if (rw) {
@@ -1311,7 +1311,7 @@ static inline void __account_m(struct io_stats *ios, struct blk_io_trace *t,
 	}
 }
 
-static inline void account_m(struct blk_io_trace *t, struct per_cpu_info *pci,
+static inline void account_m(struct blk_io_trace2 *t, struct per_cpu_info *pci,
 			     int rw)
 {
 	__account_m(&pci->io_stats, t, rw);
@@ -1324,7 +1324,7 @@ static inline void account_m(struct blk_io_trace *t, struct per_cpu_info *pci,
 }
 
 static inline void __account_pc_queue(struct io_stats *ios,
-				      struct blk_io_trace *t, int rw)
+				      struct blk_io_trace2 *t, int rw)
 {
 	if (rw) {
 		ios->qwrites_pc++;
@@ -1337,7 +1337,7 @@ static inline void __account_pc_queue(struct io_stats *ios,
 	}
 }
 
-static inline void account_pc_queue(struct blk_io_trace *t,
+static inline void account_pc_queue(struct blk_io_trace2 *t,
 				    struct per_cpu_info *pci, int rw)
 {
 	__account_pc_queue(&pci->io_stats, t, rw);
@@ -1363,7 +1363,7 @@ static inline void __account_pc_issue(struct io_stats *ios, int rw,
 	}
 }
 
-static inline void account_pc_issue(struct blk_io_trace *t,
+static inline void account_pc_issue(struct blk_io_trace2 *t,
 				    struct per_cpu_info *pci, int rw)
 {
 	__account_pc_issue(&pci->io_stats, rw, t->bytes);
@@ -1376,7 +1376,7 @@ static inline void account_pc_issue(struct blk_io_trace *t,
 }
 
 static inline void __account_pc_requeue(struct io_stats *ios,
-					struct blk_io_trace *t, int rw)
+					struct blk_io_trace2 *t, int rw)
 {
 	if (rw) {
 		ios->wrqueue_pc++;
@@ -1389,7 +1389,7 @@ static inline void __account_pc_requeue(struct io_stats *ios,
 	}
 }
 
-static inline void account_pc_requeue(struct blk_io_trace *t,
+static inline void account_pc_requeue(struct blk_io_trace2 *t,
 				      struct per_cpu_info *pci, int rw)
 {
 	__account_pc_requeue(&pci->io_stats, t, rw);
@@ -1409,7 +1409,7 @@ static inline void __account_pc_c(struct io_stats *ios, int rw)
 		ios->creads_pc++;
 }
 
-static inline void account_pc_c(struct blk_io_trace *t,
+static inline void account_pc_c(struct blk_io_trace2 *t,
 				struct per_cpu_info *pci, int rw)
 {
 	__account_pc_c(&pci->io_stats, rw);
@@ -1421,7 +1421,7 @@ static inline void account_pc_c(struct blk_io_trace *t,
 	}
 }
 
-static inline void __account_queue(struct io_stats *ios, struct blk_io_trace *t,
+static inline void __account_queue(struct io_stats *ios, struct blk_io_trace2 *t,
 				   int rw)
 {
 	if (rw) {
@@ -1435,7 +1435,7 @@ static inline void __account_queue(struct io_stats *ios, struct blk_io_trace *t,
 	}
 }
 
-static inline void account_queue(struct blk_io_trace *t,
+static inline void account_queue(struct blk_io_trace2 *t,
 				 struct per_cpu_info *pci, int rw)
 {
 	__account_queue(&pci->io_stats, t, rw);
@@ -1460,7 +1460,7 @@ static inline void __account_c(struct io_stats *ios, int rw, int bytes)
 	}
 }
 
-static inline void account_c(struct blk_io_trace *t, struct per_cpu_info *pci,
+static inline void account_c(struct blk_io_trace2 *t, struct per_cpu_info *pci,
 			     int rw, int bytes)
 {
 	__account_c(&pci->io_stats, rw, bytes);
@@ -1486,7 +1486,7 @@ static inline void __account_issue(struct io_stats *ios, int rw,
 	}
 }
 
-static inline void account_issue(struct blk_io_trace *t,
+static inline void account_issue(struct blk_io_trace2 *t,
 				 struct per_cpu_info *pci, int rw)
 {
 	__account_issue(&pci->io_stats, rw, t->bytes);
@@ -1506,7 +1506,7 @@ static inline void __account_unplug(struct io_stats *ios, int timer)
 		ios->io_unplugs++;
 }
 
-static inline void account_unplug(struct blk_io_trace *t,
+static inline void account_unplug(struct blk_io_trace2 *t,
 				  struct per_cpu_info *pci, int timer)
 {
 	__account_unplug(&pci->io_stats, timer);
@@ -1519,7 +1519,7 @@ static inline void account_unplug(struct blk_io_trace *t,
 }
 
 static inline void __account_requeue(struct io_stats *ios,
-				     struct blk_io_trace *t, int rw)
+				     struct blk_io_trace2 *t, int rw)
 {
 	if (rw) {
 		ios->wrqueue++;
@@ -1532,7 +1532,7 @@ static inline void __account_requeue(struct io_stats *ios,
 	}
 }
 
-static inline void account_requeue(struct blk_io_trace *t,
+static inline void account_requeue(struct blk_io_trace2 *t,
 				   struct per_cpu_info *pci, int rw)
 {
 	__account_requeue(&pci->io_stats, t, rw);
@@ -1545,31 +1545,31 @@ static inline void account_requeue(struct blk_io_trace *t,
 }
 
 static void log_complete(struct per_dev_info *pdi, struct per_cpu_info *pci,
-			 struct blk_io_trace *t, char *act)
+			 struct blk_io_trace2 *t, char *act)
 {
 	process_fmt(act, pci, t, log_track_complete(pdi, t), 0, NULL);
 }
 
 static void log_insert(struct per_dev_info *pdi, struct per_cpu_info *pci,
-		       struct blk_io_trace *t, char *act)
+		       struct blk_io_trace2 *t, char *act)
 {
 	process_fmt(act, pci, t, log_track_insert(pdi, t), 0, NULL);
 }
 
-static void log_queue(struct per_cpu_info *pci, struct blk_io_trace *t,
+static void log_queue(struct per_cpu_info *pci, struct blk_io_trace2 *t,
 		      char *act)
 {
 	process_fmt(act, pci, t, -1, 0, NULL);
 }
 
 static void log_issue(struct per_dev_info *pdi, struct per_cpu_info *pci,
-		      struct blk_io_trace *t, char *act)
+		      struct blk_io_trace2 *t, char *act)
 {
 	process_fmt(act, pci, t, log_track_issue(pdi, t), 0, NULL);
 }
 
 static void log_merge(struct per_dev_info *pdi, struct per_cpu_info *pci,
-		      struct blk_io_trace *t, char *act)
+		      struct blk_io_trace2 *t, char *act)
 {
 	if (act[0] == 'F')
 		log_track_frontmerge(pdi, t);
@@ -1577,38 +1577,38 @@ static void log_merge(struct per_dev_info *pdi, struct per_cpu_info *pci,
 	process_fmt(act, pci, t, -1ULL, 0, NULL);
 }
 
-static void log_action(struct per_cpu_info *pci, struct blk_io_trace *t,
+static void log_action(struct per_cpu_info *pci, struct blk_io_trace2 *t,
 			char *act)
 {
 	process_fmt(act, pci, t, -1ULL, 0, NULL);
 }
 
-static void log_generic(struct per_cpu_info *pci, struct blk_io_trace *t,
+static void log_generic(struct per_cpu_info *pci, struct blk_io_trace2 *t,
 			char *act)
 {
 	process_fmt(act, pci, t, -1ULL, 0, NULL);
 }
 
-static void log_unplug(struct per_cpu_info *pci, struct blk_io_trace *t,
+static void log_unplug(struct per_cpu_info *pci, struct blk_io_trace2 *t,
 		      char *act)
 {
 	process_fmt(act, pci, t, -1ULL, 0, NULL);
 }
 
-static void log_split(struct per_cpu_info *pci, struct blk_io_trace *t,
+static void log_split(struct per_cpu_info *pci, struct blk_io_trace2 *t,
 		      char *act)
 {
 	process_fmt(act, pci, t, -1ULL, 0, NULL);
 }
 
-static void log_pc(struct per_cpu_info *pci, struct blk_io_trace *t, char *act)
+static void log_pc(struct per_cpu_info *pci, struct blk_io_trace2 *t, char *act)
 {
 	unsigned char *buf = (unsigned char *) t + sizeof(*t);
 
 	process_fmt(act, pci, t, -1ULL, t->pdu_len, buf);
 }
 
-static void dump_trace_pc(struct blk_io_trace *t, struct per_dev_info *pdi,
+static void dump_trace_pc(struct blk_io_trace2 *t, struct per_dev_info *pdi,
 			  struct per_cpu_info *pci)
 {
 	int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
@@ -1657,7 +1657,7 @@ static void dump_trace_pc(struct blk_io_trace *t, struct per_dev_info *pdi,
 	}
 }
 
-static void dump_trace_fs(struct blk_io_trace *t, struct per_dev_info *pdi,
+static void dump_trace_fs(struct blk_io_trace2 *t, struct per_dev_info *pdi,
 			  struct per_cpu_info *pci)
 {
 	int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
@@ -1737,12 +1737,12 @@ static void dump_trace_fs(struct blk_io_trace *t, struct per_dev_info *pdi,
 			/* dump to binary file only */
 			break;
 		default:
-			fprintf(stderr, "Bad fs action %x\n", t->action);
+			fprintf(stderr, "Bad fs action %llx\n", t->action);
 			break;
 	}
 }
 
-static void dump_trace(struct blk_io_trace *t, struct per_cpu_info *pci,
+static void dump_trace(struct blk_io_trace2 *t, struct per_cpu_info *pci,
 		       struct per_dev_info *pdi)
 {
 	if (text_output) {
@@ -2162,7 +2162,7 @@ static void find_genesis(void)
 	}
 }
 
-static inline int check_stopwatch(struct blk_io_trace *bit)
+static inline int check_stopwatch(struct blk_io_trace2 *bit)
 {
 	if (bit->time < stopwatch_end &&
 	    bit->time >= stopwatch_start)
@@ -2185,7 +2185,7 @@ static int sort_entries(unsigned long long *youngest)
 
 	*youngest = 0;
 	while ((t = trace_list) != NULL) {
-		struct blk_io_trace *bit = t->bit;
+		struct blk_io_trace2 *bit = t->bit;
 
 		trace_list = t->next;
 
@@ -2264,7 +2264,7 @@ static int check_cpu_map(struct per_dev_info *pdi)
 
 static int check_sequence(struct per_dev_info *pdi, struct trace *t, int force)
 {
-	struct blk_io_trace *bit = t->bit;
+	struct blk_io_trace2 *bit = t->bit;
 	unsigned long expected_sequence;
 	struct per_cpu_info *pci;
 	struct trace *__t;
@@ -2315,7 +2315,7 @@ static void show_entries_rb(int force)
 {
 	struct per_dev_info *pdi = NULL;
 	struct per_cpu_info *pci = NULL;
-	struct blk_io_trace *bit;
+	struct blk_io_trace2 *bit;
 	struct rb_node *n;
 	struct trace *t;
 
@@ -2428,12 +2428,22 @@ static inline __u32 get_magic(__u32 magic)
 	return __bswap_32(magic);
 }
 
-static int read_one_bit(int fd, struct blk_io_trace *bit, int block,
+static int read_one_bit(int fd, struct blk_io_trace2 **bit2, int block,
 			int *fdblock)
 {
+	struct blk_io_trace2 *new = *bit2;
+	struct blk_io_trace *bit;
 	int ret;
 	int pdu_len;
-	void *p = (void *) ((u8 *)bit + sizeof(__u32));
+	void *p;
+
+	bit = malloc(sizeof(*bit));
+	if (!bit)
+		return -1;
+
+	bit->magic = new->magic;
+
+	p = (void *) ((u8 *)bit + sizeof(__u32));
 
 	ret = read_data(fd, p, sizeof(*bit) - sizeof(__u32), block, fdblock);
 	if (ret)
@@ -2449,9 +2459,14 @@ static int read_one_bit(int fd, struct blk_io_trace *bit, int block,
 			return ret;
 		}
 		bit = ptr;
+
+		new = realloc(*bit2, sizeof(struct blk_io_trace2) + pdu_len);
 	}
 
 	bit_trace_to_cpu(bit);
+	bit_to_bit2(bit, new);
+	free(bit);
+	*bit2 = new;
 
 	return 0;
 }
@@ -2491,11 +2506,11 @@ static int read_events(int fd, int always_block, int *fdblock)
 		}
 		version = magic & 0xff;
 		if (version == SUPPORTED_VERSION) {
-			struct blk_io_trace *bit;
+			struct blk_io_trace2 *bit;
 			bit = bit_alloc();
 			bit->magic = magic;
 
-			ret = read_one_bit(fd, bit, 1, fdblock);
+			ret = read_one_bit(fd, &bit, 1, fdblock);
 			if (ret)
 				break;
 
@@ -2620,7 +2635,7 @@ static int ms_prime(struct ms_stream *msp)
 	struct trace *t;
 	struct per_dev_info *pdi = msp->pdi;
 	struct per_cpu_info *pci = get_cpu_info(pdi, msp->cpu);
-	struct blk_io_trace *bit = NULL;
+	struct blk_io_trace2 *bit = NULL;
 	int ret, ndone = 0;
 
 	for (i = 0; !is_done() && pci->fd >= 0 && i < rb_batch; i++) {
@@ -2645,7 +2660,7 @@ static int ms_prime(struct ms_stream *msp)
 			bit = bit_alloc();
 			bit->magic = magic;
 
-			ret = read_one_bit(pci->fd, bit, 1, &pci->fdblock);
+			ret = read_one_bit(pci->fd, &bit, 1, &pci->fdblock);
 			if (ret)
 				goto err;
 
@@ -2767,7 +2782,7 @@ static int handle(struct ms_stream *msp)
 	struct trace *t;
 	struct per_dev_info *pdi;
 	struct per_cpu_info *pci;
-	struct blk_io_trace *bit;
+	struct blk_io_trace2 *bit;
 
 	t = ms_peek(msp);
 
diff --git a/blkparse_fmt.c b/blkparse_fmt.c
index 02c5a3c..f93addb 100644
--- a/blkparse_fmt.c
+++ b/blkparse_fmt.c
@@ -51,7 +51,7 @@ int add_format_spec(char *option)
 	return 0;
 }
 
-static inline void fill_rwbs(char *rwbs, struct blk_io_trace *t)
+static inline void fill_rwbs(char *rwbs, struct blk_io_trace2 *t)
 {
 	bool w = !!(t->action & BLK_TC_ACT(BLK_TC_WRITE));
 	bool a = !!(t->action & BLK_TC_ACT(BLK_TC_AHEAD));
@@ -146,16 +146,16 @@ static char *dump_pdu(unsigned char *pdu_buf, int pdu_len)
 	return p;
 }
 
-#define pdu_start(t)	(((void *) (t) + sizeof(struct blk_io_trace)))
+#define pdu_start(t)	(((void *) (t) + sizeof(struct blk_io_trace2)))
 
-static unsigned int get_pdu_int(struct blk_io_trace *t)
+static unsigned int get_pdu_int(struct blk_io_trace2 *t)
 {
 	__u64 *val = pdu_start(t);
 
 	return be64_to_cpu(*val);
 }
 
-static void get_pdu_remap(struct blk_io_trace *t, struct blk_io_trace_remap *r)
+static void get_pdu_remap(struct blk_io_trace2 *t, struct blk_io_trace_remap *r)
 {
 	struct blk_io_trace_remap *__r = pdu_start(t);
 	__u64 sector_from = __r->sector_from;
@@ -166,7 +166,7 @@ static void get_pdu_remap(struct blk_io_trace *t, struct blk_io_trace_remap *r)
 }
 
 static void print_field(char *act, struct per_cpu_info *pci,
-			struct blk_io_trace *t, unsigned long long elapsed,
+			struct blk_io_trace2 *t, unsigned long long elapsed,
 			int pdu_len, unsigned char *pdu_buf, char field,
 			int minus, int has_w, int width)
 {
@@ -275,7 +275,7 @@ static void print_field(char *act, struct per_cpu_info *pci,
 }
 
 static char *parse_field(char *act, struct per_cpu_info *pci,
-			 struct blk_io_trace *t, unsigned long long elapsed,
+			 struct blk_io_trace2 *t, unsigned long long elapsed,
 			 int pdu_len, unsigned char *pdu_buf,
 			 char *primary_format)
 {
@@ -302,7 +302,7 @@ static char *parse_field(char *act, struct per_cpu_info *pci,
 }
 
 static void process_default(char *act, struct per_cpu_info *pci,
-			    struct blk_io_trace *t, unsigned long long elapsed,
+			    struct blk_io_trace2 *t, unsigned long long elapsed,
 			    int pdu_len, unsigned char *pdu_buf)
 {
 	struct blk_io_trace_remap r = { .device_from = 0, };
@@ -436,7 +436,7 @@ static void process_default(char *act, struct per_cpu_info *pci,
 
 }
 
-void process_fmt(char *act, struct per_cpu_info *pci, struct blk_io_trace *t,
+void process_fmt(char *act, struct per_cpu_info *pci, struct blk_io_trace2 *t,
 		 unsigned long long elapsed, int pdu_len,
 		 unsigned char *pdu_buf)
 {
diff --git a/blktrace.h b/blktrace.h
index 08ac28b..196b3c9 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -6,6 +6,7 @@
 #include <byteswap.h>
 #include <endian.h>
 #include <sys/types.h>
+#include <string.h>
 
 #include "blktrace_api.h"
 #include "rbtree.h"
@@ -108,6 +109,26 @@ static inline int verify_trace(__u32 magic)
 	return 0;
 }
 
+static inline void bit_to_bit2(struct blk_io_trace *old,
+			       struct blk_io_trace2 *new)
+{
+	new->magic	= old->magic;
+	new->sequence	= old->sequence;
+	new->time	= old->time;
+	new->sector	= old->sector;
+	new->bytes	= old->bytes;
+	new->action	= 0 | old->action;
+	new->pid	= old->pid;
+	new->device	= old->device;
+	new->cpu	= old->cpu;
+	new->error	= old->error;
+	new->pdu_len	= old->pdu_len;
+
+	if (new->pdu_len)
+		memcpy(((u8 *) new + sizeof(*new)), ((u8 *)old + sizeof(*old)),
+		       old->pdu_len);
+}
+
 static inline void bit_trace_to_cpu(struct blk_io_trace *t)
 {
 	if (data_is_native)
@@ -147,7 +168,7 @@ static inline int check_data_endianness(u32 magic)
 
 extern void set_all_format_specs(char *);
 extern int add_format_spec(char *);
-extern void process_fmt(char *, struct per_cpu_info *, struct blk_io_trace *,
+extern void process_fmt(char *, struct per_cpu_info *, struct blk_io_trace2 *,
 			unsigned long long, int, unsigned char *);
 extern unsigned long long valid_act_opt(unsigned long long);
 extern int find_mask_map(char *);
-- 
2.51.0

[PATCH 17/21] blkparse: natively parse blk_io_trace2

[Johannes Thumshirn]

Natively parse 'struct blk_io_trace2' from a blktrace binary.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 blktrace.h |  18 +++++++++
 2 files changed, 130 insertions(+)

diff --git a/blkparse.c b/blkparse.c
index 1237c02..e702356 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2471,6 +2471,37 @@ static int read_one_bit(int fd, struct blk_io_trace2 **bit2, int block,
 	return 0;
 }
 
+static int read_one_bit2(int fd, struct blk_io_trace2 **bit2, int block,
+			 int *fdblock)
+{
+	struct blk_io_trace2 *new = *bit2;
+	int ret;
+	int pdu_len;
+	void *p;
+
+	p = (void *) ((u8 *)new + sizeof(__u32));
+
+	ret = read_data(fd, p, sizeof(*new) - sizeof(__u32), block, fdblock);
+	if (ret)
+		return ret;
+
+	pdu_len = get_pdulen(new->pdu_len);
+	if (pdu_len) {
+		void *ptr = realloc(new, sizeof(*new) + pdu_len);
+
+		ret = read_data(fd, ptr + sizeof(*new), pdu_len, 1, fdblock);
+		if (ret) {
+			free(ptr);
+			return ret;
+		}
+		new = ptr;
+	}
+
+	bit2_trace_to_cpu(new);
+	*bit2 = new;
+
+	return 0;
+}
 static int read_events(int fd, int always_block, int *fdblock)
 {
 	struct per_dev_info *pdi = NULL;
@@ -2538,6 +2569,44 @@ static int read_events(int fd, int always_block, int *fdblock)
 			t->next = trace_list;
 			trace_list = t;
 
+			if (!pdi || pdi->dev != bit->device)
+				pdi = get_dev_info(bit->device);
+
+			if (bit->time > pdi->last_read_time)
+				pdi->last_read_time = bit->time;
+		} else if (version == SUPPORTED_VERSION2) {
+			struct blk_io_trace2 *bit;
+			bit = bit_alloc();
+			bit->magic = magic;
+
+			ret = read_one_bit2(fd, &bit, 1, fdblock);
+			if (ret)
+				break;
+
+			/*
+			 * not a real trace, so grab and handle it here
+			 */
+			if (bit->action & BLK_TC_ACT(BLK_TC_NOTIFY) &&
+			    (bit->action & ~__BLK_TN_CGROUP) != BLK_TN_MESSAGE) {
+				handle_notify(bit);
+				output_binary(bit, sizeof(*bit) + bit->pdu_len);
+				continue;
+			}
+
+			if (verify_trace(bit->magic)) {
+				bit_free(bit);
+				bit = NULL;
+				continue;
+			}
+
+			t = t_alloc();
+			memset(t, 0, sizeof(*t));
+			t->bit = bit;
+			t->read_sequence = read_sequence;
+
+			t->next = trace_list;
+			trace_list = t;
+
 			if (!pdi || pdi->dev != bit->device)
 				pdi = get_dev_info(bit->device);
 
@@ -2698,6 +2767,49 @@ static int ms_prime(struct ms_stream *msp)
 				msp->last->next = t;
 				msp->last = t;
 			}
+		} else if (version == SUPPORTED_VERSION2) {
+			bit = bit_alloc();
+			bit->magic = magic;
+
+			ret = read_one_bit2(pci->fd, &bit, 1, &pci->fdblock);
+			if (ret)
+				goto err;
+
+			if (verify_trace(bit->magic))
+				goto err;
+
+			if (bit->cpu != pci->cpu) {
+				fprintf(stderr,
+					"cpu %d trace info has error cpu %d\n",
+					pci->cpu, bit->cpu);
+				continue;
+			}
+
+			if (bit->action & BLK_TC_ACT(BLK_TC_NOTIFY) &&
+			    (bit->action & ~__BLK_TN_CGROUP) != BLK_TN_MESSAGE) {
+				handle_notify(bit);
+				output_binary(bit, sizeof(*bit) + bit->pdu_len);
+				bit_free(bit);
+				bit = NULL;
+
+				i -= 1;
+				continue;
+			}
+
+			if (bit->time > pdi->last_read_time)
+				pdi->last_read_time = bit->time;
+
+			t = t_alloc();
+			memset(t, 0, sizeof(*t));
+			t->bit = bit;
+
+			if (msp->first == NULL)
+				msp->first = msp->last = t;
+			else {
+				msp->last->next = t;
+				msp->last = t;
+			}
+
 		} else {
 			fprintf(stderr, "unsupported version %d\n", version);
 			continue;
diff --git a/blktrace.h b/blktrace.h
index 196b3c9..ba06237 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -129,6 +129,24 @@ static inline void bit_to_bit2(struct blk_io_trace *old,
 		       old->pdu_len);
 }
 
+static inline void bit2_trace_to_cpu(struct blk_io_trace2 *t)
+{
+	if (data_is_native)
+		return;
+
+	t->magic	= be32_to_cpu(t->magic);
+	t->sequence	= be32_to_cpu(t->sequence);
+	t->time		= be64_to_cpu(t->time);
+	t->sector	= be64_to_cpu(t->sector);
+	t->bytes	= be32_to_cpu(t->bytes);
+	t->action	= be64_to_cpu(t->action);
+	t->pid		= be32_to_cpu(t->pid);
+	t->device	= be32_to_cpu(t->device);
+	t->cpu		= be32_to_cpu(t->cpu);
+	t->error	= be16_to_cpu(t->error);
+	t->pdu_len	= be16_to_cpu(t->pdu_len);
+}
+
 static inline void bit_trace_to_cpu(struct blk_io_trace *t)
 {
 	if (data_is_native)
-- 
2.51.0

[PATCH 18/21] blkparse: parse zone (un)plug actions

[Johannes Thumshirn]

Parse Zone Write Plugging plug and unplug actions in blkparse.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c     |  7 +++++++
 blkparse_fmt.c | 19 +++++++++++++++++++
 blktrace_api.h |  2 ++
 3 files changed, 28 insertions(+)

diff --git a/blkparse.c b/blkparse.c
index e702356..1a372e5 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -1722,6 +1722,13 @@ static void dump_trace_fs(struct blk_io_trace2 *t, struct per_dev_info *pdi,
 			account_unplug(t, pci, 1);
 			log_unplug(pci, t, "UT");
 			break;
+		case __BLK_TA_ZONE_PLUG:
+			log_action(pci, t, "ZP");
+			break;
+		case __BLK_TA_ZONE_UNPLUG:
+			account_unplug(t, pci, 0);
+			log_unplug(pci, t, "ZU");
+			break;
 		case __BLK_TA_SPLIT:
 			log_track_split(pdi, t);
 			log_split(pci, t, "X");
diff --git a/blkparse_fmt.c b/blkparse_fmt.c
index f93addb..a5f721f 100644
--- a/blkparse_fmt.c
+++ b/blkparse_fmt.c
@@ -301,6 +301,22 @@ static char *parse_field(char *act, struct per_cpu_info *pci,
 	return p;
 }
 
+static void process_zoned(char *act, struct blk_io_trace2 *t,
+			  unsigned long long elapsed, char *name)
+{
+	switch (act[1]) {
+	case 'P': /* Zone Plug */
+		fprintf(ofp, "[%s]\n", name);
+		break;
+	case 'U': /* Zone Unplug */
+		fprintf(ofp, "[%s] %u\n", name, get_pdu_int(t));
+		break;
+	default:
+		fprintf(stderr, "Unknown zoned action %c\n", act[1]);
+		break;
+	}
+}
+
 static void process_default(char *act, struct per_cpu_info *pci,
 			    struct blk_io_trace2 *t, unsigned long long elapsed,
 			    int pdu_len, unsigned char *pdu_buf)
@@ -429,6 +445,9 @@ static void process_default(char *act, struct per_cpu_info *pci,
 		fprintf(ofp, "%*s\n", pdu_len, pdu_buf);
 		break;
 
+	case 'Z':	/* Zoned command */
+		process_zoned(act, t, elapsed, name);
+		break;
 	default:
 		fprintf(stderr, "Unknown action %c\n", act[0]);
 		break;
diff --git a/blktrace_api.h b/blktrace_api.h
index bbf075f..3966e1a 100644
--- a/blktrace_api.h
+++ b/blktrace_api.h
@@ -62,6 +62,8 @@ enum {
 	__BLK_TA_REMAP,			/* bio was remapped */
 	__BLK_TA_ABORT,			/* request aborted */
 	__BLK_TA_DRV_DATA,		/* binary driver data */
+	__BLK_TA_ZONE_PLUG,		/* zone write plug was plugged */
+	__BLK_TA_ZONE_UNPLUG,		/* zone write plug was unplugged */
 	__BLK_TA_ZONE_MGMT,		/* zone management command was issued */
 	__BLK_TA_CGROUP = 1 << 8,
 };
-- 
2.51.0

[PATCH 19/21] blkparse: add zoned commands to fill_rwbs()

[Johannes Thumshirn]

Parse zoned commands in blkparse.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse_fmt.c | 34 ++++++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/blkparse_fmt.c b/blkparse_fmt.c
index a5f721f..467c8c5 100644
--- a/blkparse_fmt.c
+++ b/blkparse_fmt.c
@@ -60,19 +60,45 @@ static inline void fill_rwbs(char *rwbs, struct blk_io_trace2 *t)
 	bool d = !!(t->action & BLK_TC_ACT(BLK_TC_DISCARD));
 	bool f = !!(t->action & BLK_TC_ACT(BLK_TC_FLUSH));
 	bool u = !!(t->action & BLK_TC_ACT(BLK_TC_FUA));
+	bool za = !!(t->action & BLK_TC_ACT2(BLK_TC_ZONE_APPEND));
+	bool zr = !!(t->action & BLK_TC_ACT2(BLK_TC_ZONE_RESET));
+	bool zra = !!(t->action & BLK_TC_ACT2(BLK_TC_ZONE_RESET_ALL));
+	bool zf = !!(t->action & BLK_TC_ACT2(BLK_TC_ZONE_FINISH));
+	bool zo = !!(t->action & BLK_TC_ACT2(BLK_TC_ZONE_OPEN));
+	bool zc = !!(t->action & BLK_TC_ACT2(BLK_TC_ZONE_CLOSE));
 	int i = 0;
 
 	if (f)
 		rwbs[i++] = 'F'; /* flush */
 
-	if (d)
+	if (d) {
 		rwbs[i++] = 'D';
-	else if (w)
+	} else if (za) {
+		rwbs[i++] = 'Z';
+		rwbs[i++] = 'A';
+	} else if (zr) {
+		rwbs[i++] = 'Z';
+		rwbs[i++] = 'R';
+	} else if (zra) {
+		rwbs[i++] = 'Z';
+		rwbs[i++] = 'R';
+		rwbs[i++] = 'A';
+	} else if (zf) {
+		rwbs[i++] = 'Z';
+		rwbs[i++] = 'F';
+	} else if (zo) {
+		rwbs[i++] = 'Z';
+		rwbs[i++] = 'O';
+	} else if (zc) {
+		rwbs[i++] = 'Z';
+		rwbs[i++] = 'C';
+	} else if (w) {
 		rwbs[i++] = 'W';
-	else if (t->bytes)
+	} else if (t->bytes) {
 		rwbs[i++] = 'R';
-	else
+	} else {
 		rwbs[i++] = 'N';
+	}
 
 	if (u)
 		rwbs[i++] = 'F'; /* fua */
-- 
2.51.0

[PATCH 20/21] blkparse: parse zone management commands

[Johannes Thumshirn]

Parse management commands in blkparse.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/blkparse.c b/blkparse.c
index 1a372e5..1e3718b 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -1651,6 +1651,9 @@ static void dump_trace_pc(struct blk_io_trace2 *t, struct per_dev_info *pdi,
 		case __BLK_TA_INSERT:
 			log_pc(pci, t, "I");
 			break;
+		case __BLK_TA_ZONE_MGMT:
+			log_action(pci, t, "ZM");
+			break;
 		default:
 			fprintf(stderr, "Bad pc action %x\n", act);
 			break;
@@ -1729,6 +1732,9 @@ static void dump_trace_fs(struct blk_io_trace2 *t, struct per_dev_info *pdi,
 			account_unplug(t, pci, 0);
 			log_unplug(pci, t, "ZU");
 			break;
+		case __BLK_TA_ZONE_MGMT:
+			log_action(pci, t, "ZM");
+			break;
 		case __BLK_TA_SPLIT:
 			log_track_split(pdi, t);
 			log_split(pci, t, "X");
-- 
2.51.0

[PATCH 21/21] blkparse: parse zone append completions

[Johannes Thumshirn]

Parse completion of Zone Append commands in blkparse.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 blkparse_fmt.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/blkparse_fmt.c b/blkparse_fmt.c
index 467c8c5..725ddbe 100644
--- a/blkparse_fmt.c
+++ b/blkparse_fmt.c
@@ -331,6 +331,27 @@ static void process_zoned(char *act, struct blk_io_trace2 *t,
 			  unsigned long long elapsed, char *name)
 {
 	switch (act[1]) {
+	case 'A':	/* Zone Append */
+		if (elapsed != -1ULL) {
+			if (t_sec(t))
+				fprintf(ofp, "%llu + %u (%8llu) [%d]\n",
+					(unsigned long long) t->sector,
+					t_sec(t), elapsed, t->error);
+			else
+				fprintf(ofp, "%llu (%8llu) [%d]\n",
+					(unsigned long long) t->sector,
+					elapsed, t->error);
+		} else {
+			if (t_sec(t))
+				fprintf(ofp, "%llu + %u [%d]\n",
+					(unsigned long long) t->sector,
+					t_sec(t), t->error);
+			else
+				fprintf(ofp, "%llu [%d]\n",
+					(unsigned long long) t->sector,
+					t->error);
+		}
+		break;
 	case 'P': /* Zone Plug */
 		fprintf(ofp, "[%s]\n", name);
 		break;
-- 
2.51.0

Re: [PATCH 00/21] blktrace: Add user-space support for zoned command tracing

[Masami Hiramatsu]

Hi Johannes,

On Tue,  9 Sep 2025 13:07:02 +0200
Johannes Thumshirn <johannes.thumshirn@wdc.com> wrote:

> This patch series extends the user-space blktrace tools to support the new
> trace events for zoned block device commands introduced in the corresponding
> kernel patch series.

I guess this series are patches against for user-space blktrace tool

https://git.kernel.dk/?p=blktrace.git

And the updates depends on the kernel side update of your series;

https://lore.kernel.org/all/20250909110611.75559-1-johannes.thumshirn@wdc.com/

Right?
I'm not sure how the blktrace tool development is managed, but please make
sure this series is not for the kernel. (ah, both has blktrace: tag, hmmm)

Thank you,

> 
> The updates include:
> 
> - Introduction of a new ioctl requesting the v2 version of the trace
> - Definitions for new zoned operation trace events.
> - Parsing support in blkparse for these events.
> - Display of the new events with clear labeling (e.g., ZO, ZA, ZR).
> - Backward-compatible changes that do not affect existing functionality.
> 
> These changes complement the kernel patches and allow full visibility into
> zone management commands in blktrace output, enabling better analysis and
> debugging of zoned storage workloads.
> 
> The updated blktrace utility will first issue the BLKTRACESETUP2 ioctl and if
> it fails transpartently fall back to BLKTRACESETUP allowing backwards
> compatibility.
> 
> Feedback and testing on additional device types are appreciated.
> 
> Johannes Thumshirn (21):
>   fix comment for struct blk_trace_setup:
>   add definitions for BLKTRACESETUP2
>   call BLKTRACESETUP2 ioctl per default to setup a trace
>   blktrace: change size of action to 64 bits
>   blktrace: add definitions for blk_io_trace2
>   blktrace: support protocol version 8
>   blkparse: pass magic to get_magic
>   blkparse: read 'magic' first
>   blkparse: factor out reading of a singe blk_io_trace event
>   blkparse: skip unsupported protocol versions
>   blkparse: make get_pdulen() take the pdu_len
>   blkiomon: read 'magic' first
>   blktrace: pass magic to CHECK_MAGIC macro
>   blktrace: pass magic to verify_trace
>   blktrace: rename trace_to_cpu to bit_trace_to_cpu
>   blkparse: use blk_io_trace2 internally
>   blkparse: natively parse blk_io_trace2
>   blkparse: parse zone (un)plug actions
>   blkparse: add zoned commands to fill_rwbs()
>   blkparse: parse zone management commands
>   blkparse: parse zone append completions
> 
>  act_mask.c     |   4 +-
>  blkiomon.c     |  15 +-
>  blkparse.c     | 450 ++++++++++++++++++++++++++++++++++---------------
>  blkparse_fmt.c | 105 +++++++++---
>  blkrawverify.c |  14 +-
>  blktrace.c     |  40 ++++-
>  blktrace.h     |  64 +++++--
>  blktrace_api.h |  54 +++++-
>  8 files changed, 560 insertions(+), 186 deletions(-)
> 
> -- 
> 2.51.0
> 


-- 
Masami Hiramatsu (Google) <mhiramat@kernel.org>

Re: [PATCH 00/21] blktrace: Add user-space support for zoned command tracing

[Johannes Thumshirn]

On 9/14/25 11:18 AM, Masami Hiramatsu wrote:
> Hi Johannes,
>
> On Tue,  9 Sep 2025 13:07:02 +0200
> Johannes Thumshirn <johannes.thumshirn@wdc.com> wrote:
>
>> This patch series extends the user-space blktrace tools to support the new
>> trace events for zoned block device commands introduced in the corresponding
>> kernel patch series.
> I guess this series are patches against for user-space blktrace tool
>
> https://git.kernel.dk/?p=blktrace.git
>
> And the updates depends on the kernel side update of your series;
>
> https://lore.kernel.org/all/20250909110611.75559-1-johannes.thumshirn@wdc.com/
>
> Right?
> I'm not sure how the blktrace tool development is managed, but please make
> sure this series is not for the kernel. (ah, both has blktrace: tag, hmmm)

You're right. I'll add a subject prefix for v2 so they can be better 
distinguished.

Thanks,
     Johannes