2 * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 #include <linux/kernel.h>
19 #include <linux/blkdev.h>
20 #include <linux/blktrace_api.h>
21 #include <linux/percpu.h>
22 #include <linux/init.h>
23 #include <linux/mutex.h>
24 #include <linux/debugfs.h>
25 #include <linux/time.h>
26 #include <linux/uaccess.h>
28 #include <trace/events/block.h>
30 #include "trace_output.h"
32 #ifdef CONFIG_BLK_DEV_IO_TRACE
34 static unsigned int blktrace_seq __read_mostly
= 1;
36 static struct trace_array
*blk_tr
;
37 static bool blk_tracer_enabled __read_mostly
;
39 /* Select an alternative, minimalistic output than the original one */
40 #define TRACE_BLK_OPT_CLASSIC 0x1
42 static struct tracer_opt blk_tracer_opts
[] = {
43 /* Default disable the minimalistic output */
44 { TRACER_OPT(blk_classic
, TRACE_BLK_OPT_CLASSIC
) },
48 static struct tracer_flags blk_tracer_flags
= {
50 .opts
= blk_tracer_opts
,
53 /* Global reference count of probes */
54 static atomic_t blk_probes_ref
= ATOMIC_INIT(0);
56 static void blk_register_tracepoints(void);
57 static void blk_unregister_tracepoints(void);
60 * Send out a notify message.
62 static void trace_note(struct blk_trace
*bt
, pid_t pid
, int action
,
63 const void *data
, size_t len
)
65 struct blk_io_trace
*t
;
66 struct ring_buffer_event
*event
= NULL
;
68 int cpu
= smp_processor_id();
69 bool blk_tracer
= blk_tracer_enabled
;
73 event
= trace_buffer_lock_reserve(blk_tr
, TRACE_BLK
,
78 t
= ring_buffer_event_data(event
);
85 t
= relay_reserve(bt
->rchan
, sizeof(*t
) + len
);
87 t
->magic
= BLK_IO_TRACE_MAGIC
| BLK_IO_TRACE_VERSION
;
88 t
->time
= ktime_to_ns(ktime_get());
95 memcpy((void *) t
+ sizeof(*t
), data
, len
);
98 trace_buffer_unlock_commit(blk_tr
, event
, 0, pc
);
103 * Send out a notify for this process, if we haven't done so since a trace
106 static void trace_note_tsk(struct blk_trace
*bt
, struct task_struct
*tsk
)
108 tsk
->btrace_seq
= blktrace_seq
;
109 trace_note(bt
, tsk
->pid
, BLK_TN_PROCESS
, tsk
->comm
, sizeof(tsk
->comm
));
112 static void trace_note_time(struct blk_trace
*bt
)
118 getnstimeofday(&now
);
119 words
[0] = now
.tv_sec
;
120 words
[1] = now
.tv_nsec
;
122 local_irq_save(flags
);
123 trace_note(bt
, 0, BLK_TN_TIMESTAMP
, words
, sizeof(words
));
124 local_irq_restore(flags
);
127 void __trace_note_message(struct blk_trace
*bt
, const char *fmt
, ...)
134 if (unlikely(bt
->trace_state
!= Blktrace_running
&&
135 !blk_tracer_enabled
))
138 local_irq_save(flags
);
139 buf
= per_cpu_ptr(bt
->msg_data
, smp_processor_id());
141 n
= vscnprintf(buf
, BLK_TN_MAX_MSG
, fmt
, args
);
144 trace_note(bt
, 0, BLK_TN_MESSAGE
, buf
, n
);
145 local_irq_restore(flags
);
147 EXPORT_SYMBOL_GPL(__trace_note_message
);
149 static int act_log_check(struct blk_trace
*bt
, u32 what
, sector_t sector
,
152 if (((bt
->act_mask
<< BLK_TC_SHIFT
) & what
) == 0)
154 if (sector
&& (sector
< bt
->start_lba
|| sector
> bt
->end_lba
))
156 if (bt
->pid
&& pid
!= bt
->pid
)
163 * Data direction bit lookup
165 static const u32 ddir_act
[2] = { BLK_TC_ACT(BLK_TC_READ
),
166 BLK_TC_ACT(BLK_TC_WRITE
) };
168 /* The ilog2() calls fall out because they're constant */
169 #define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \
170 (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name))
173 * The worker for the various blk_add_trace*() types. Fills out a
174 * blk_io_trace structure and places it in a per-cpu subbuffer.
176 static void __blk_add_trace(struct blk_trace
*bt
, sector_t sector
, int bytes
,
177 int rw
, u32 what
, int error
, int pdu_len
, void *pdu_data
)
179 struct task_struct
*tsk
= current
;
180 struct ring_buffer_event
*event
= NULL
;
181 struct blk_io_trace
*t
;
182 unsigned long flags
= 0;
183 unsigned long *sequence
;
186 bool blk_tracer
= blk_tracer_enabled
;
188 if (unlikely(bt
->trace_state
!= Blktrace_running
&& !blk_tracer
))
191 what
|= ddir_act
[rw
& WRITE
];
192 what
|= MASK_TC_BIT(rw
, BARRIER
);
193 what
|= MASK_TC_BIT(rw
, SYNCIO
);
194 what
|= MASK_TC_BIT(rw
, AHEAD
);
195 what
|= MASK_TC_BIT(rw
, META
);
196 what
|= MASK_TC_BIT(rw
, DISCARD
);
199 if (act_log_check(bt
, what
, sector
, pid
))
201 cpu
= raw_smp_processor_id();
204 tracing_record_cmdline(current
);
206 pc
= preempt_count();
207 event
= trace_buffer_lock_reserve(blk_tr
, TRACE_BLK
,
208 sizeof(*t
) + pdu_len
,
212 t
= ring_buffer_event_data(event
);
217 * A word about the locking here - we disable interrupts to reserve
218 * some space in the relay per-cpu buffer, to prevent an irq
219 * from coming in and stepping on our toes.
221 local_irq_save(flags
);
223 if (unlikely(tsk
->btrace_seq
!= blktrace_seq
))
224 trace_note_tsk(bt
, tsk
);
226 t
= relay_reserve(bt
->rchan
, sizeof(*t
) + pdu_len
);
228 sequence
= per_cpu_ptr(bt
->sequence
, cpu
);
230 t
->magic
= BLK_IO_TRACE_MAGIC
| BLK_IO_TRACE_VERSION
;
231 t
->sequence
= ++(*sequence
);
232 t
->time
= ktime_to_ns(ktime_get());
235 * These two are not needed in ftrace as they are in the
236 * generic trace_entry, filled by tracing_generic_entry_update,
237 * but for the trace_event->bin() synthesizer benefit we do it
248 t
->pdu_len
= pdu_len
;
251 memcpy((void *) t
+ sizeof(*t
), pdu_data
, pdu_len
);
254 trace_buffer_unlock_commit(blk_tr
, event
, 0, pc
);
259 local_irq_restore(flags
);
262 static struct dentry
*blk_tree_root
;
263 static DEFINE_MUTEX(blk_tree_mutex
);
265 static void blk_trace_free(struct blk_trace
*bt
)
267 debugfs_remove(bt
->msg_file
);
268 debugfs_remove(bt
->dropped_file
);
269 debugfs_remove(bt
->dir
);
270 relay_close(bt
->rchan
);
271 free_percpu(bt
->sequence
);
272 free_percpu(bt
->msg_data
);
276 static void blk_trace_cleanup(struct blk_trace
*bt
)
279 if (atomic_dec_and_test(&blk_probes_ref
))
280 blk_unregister_tracepoints();
283 int blk_trace_remove(struct request_queue
*q
)
285 struct blk_trace
*bt
;
287 bt
= xchg(&q
->blk_trace
, NULL
);
291 if (bt
->trace_state
!= Blktrace_running
)
292 blk_trace_cleanup(bt
);
296 EXPORT_SYMBOL_GPL(blk_trace_remove
);
298 static int blk_dropped_open(struct inode
*inode
, struct file
*filp
)
300 filp
->private_data
= inode
->i_private
;
305 static ssize_t
blk_dropped_read(struct file
*filp
, char __user
*buffer
,
306 size_t count
, loff_t
*ppos
)
308 struct blk_trace
*bt
= filp
->private_data
;
311 snprintf(buf
, sizeof(buf
), "%u\n", atomic_read(&bt
->dropped
));
313 return simple_read_from_buffer(buffer
, count
, ppos
, buf
, strlen(buf
));
316 static const struct file_operations blk_dropped_fops
= {
317 .owner
= THIS_MODULE
,
318 .open
= blk_dropped_open
,
319 .read
= blk_dropped_read
,
322 static int blk_msg_open(struct inode
*inode
, struct file
*filp
)
324 filp
->private_data
= inode
->i_private
;
329 static ssize_t
blk_msg_write(struct file
*filp
, const char __user
*buffer
,
330 size_t count
, loff_t
*ppos
)
333 struct blk_trace
*bt
;
335 if (count
>= BLK_TN_MAX_MSG
)
338 msg
= kmalloc(count
+ 1, GFP_KERNEL
);
342 if (copy_from_user(msg
, buffer
, count
)) {
348 bt
= filp
->private_data
;
349 __trace_note_message(bt
, "%s", msg
);
355 static const struct file_operations blk_msg_fops
= {
356 .owner
= THIS_MODULE
,
357 .open
= blk_msg_open
,
358 .write
= blk_msg_write
,
362 * Keep track of how many times we encountered a full subbuffer, to aid
363 * the user space app in telling how many lost events there were.
365 static int blk_subbuf_start_callback(struct rchan_buf
*buf
, void *subbuf
,
366 void *prev_subbuf
, size_t prev_padding
)
368 struct blk_trace
*bt
;
370 if (!relay_buf_full(buf
))
373 bt
= buf
->chan
->private_data
;
374 atomic_inc(&bt
->dropped
);
378 static int blk_remove_buf_file_callback(struct dentry
*dentry
)
380 struct dentry
*parent
= dentry
->d_parent
;
381 debugfs_remove(dentry
);
384 * this will fail for all but the last file, but that is ok. what we
385 * care about is the top level buts->name directory going away, when
386 * the last trace file is gone. Then we don't have to rmdir() that
387 * manually on trace stop, so it nicely solves the issue with
388 * force killing of running traces.
391 debugfs_remove(parent
);
395 static struct dentry
*blk_create_buf_file_callback(const char *filename
,
396 struct dentry
*parent
,
398 struct rchan_buf
*buf
,
401 return debugfs_create_file(filename
, mode
, parent
, buf
,
402 &relay_file_operations
);
405 static struct rchan_callbacks blk_relay_callbacks
= {
406 .subbuf_start
= blk_subbuf_start_callback
,
407 .create_buf_file
= blk_create_buf_file_callback
,
408 .remove_buf_file
= blk_remove_buf_file_callback
,
411 static void blk_trace_setup_lba(struct blk_trace
*bt
,
412 struct block_device
*bdev
)
414 struct hd_struct
*part
= NULL
;
417 part
= bdev
->bd_part
;
420 bt
->start_lba
= part
->start_sect
;
421 bt
->end_lba
= part
->start_sect
+ part
->nr_sects
;
429 * Setup everything required to start tracing
431 int do_blk_trace_setup(struct request_queue
*q
, char *name
, dev_t dev
,
432 struct block_device
*bdev
,
433 struct blk_user_trace_setup
*buts
)
435 struct blk_trace
*old_bt
, *bt
= NULL
;
436 struct dentry
*dir
= NULL
;
439 if (!buts
->buf_size
|| !buts
->buf_nr
)
442 strncpy(buts
->name
, name
, BLKTRACE_BDEV_SIZE
);
443 buts
->name
[BLKTRACE_BDEV_SIZE
- 1] = '\0';
446 * some device names have larger paths - convert the slashes
447 * to underscores for this to work as expected
449 for (i
= 0; i
< strlen(buts
->name
); i
++)
450 if (buts
->name
[i
] == '/')
453 bt
= kzalloc(sizeof(*bt
), GFP_KERNEL
);
458 bt
->sequence
= alloc_percpu(unsigned long);
462 bt
->msg_data
= __alloc_percpu(BLK_TN_MAX_MSG
, __alignof__(char));
468 mutex_lock(&blk_tree_mutex
);
469 if (!blk_tree_root
) {
470 blk_tree_root
= debugfs_create_dir("block", NULL
);
471 if (!blk_tree_root
) {
472 mutex_unlock(&blk_tree_mutex
);
476 mutex_unlock(&blk_tree_mutex
);
478 dir
= debugfs_create_dir(buts
->name
, blk_tree_root
);
485 atomic_set(&bt
->dropped
, 0);
488 bt
->dropped_file
= debugfs_create_file("dropped", 0444, dir
, bt
,
490 if (!bt
->dropped_file
)
493 bt
->msg_file
= debugfs_create_file("msg", 0222, dir
, bt
, &blk_msg_fops
);
497 bt
->rchan
= relay_open("trace", dir
, buts
->buf_size
,
498 buts
->buf_nr
, &blk_relay_callbacks
, bt
);
502 bt
->act_mask
= buts
->act_mask
;
504 bt
->act_mask
= (u16
) -1;
506 blk_trace_setup_lba(bt
, bdev
);
508 /* overwrite with user settings */
510 bt
->start_lba
= buts
->start_lba
;
512 bt
->end_lba
= buts
->end_lba
;
515 bt
->trace_state
= Blktrace_setup
;
518 old_bt
= xchg(&q
->blk_trace
, bt
);
520 (void) xchg(&q
->blk_trace
, old_bt
);
524 if (atomic_inc_return(&blk_probes_ref
) == 1)
525 blk_register_tracepoints();
533 int blk_trace_setup(struct request_queue
*q
, char *name
, dev_t dev
,
534 struct block_device
*bdev
,
537 struct blk_user_trace_setup buts
;
540 ret
= copy_from_user(&buts
, arg
, sizeof(buts
));
544 ret
= do_blk_trace_setup(q
, name
, dev
, bdev
, &buts
);
548 if (copy_to_user(arg
, &buts
, sizeof(buts
)))
553 EXPORT_SYMBOL_GPL(blk_trace_setup
);
555 int blk_trace_startstop(struct request_queue
*q
, int start
)
558 struct blk_trace
*bt
= q
->blk_trace
;
564 * For starting a trace, we can transition from a setup or stopped
565 * trace. For stopping a trace, the state must be running
569 if (bt
->trace_state
== Blktrace_setup
||
570 bt
->trace_state
== Blktrace_stopped
) {
573 bt
->trace_state
= Blktrace_running
;
579 if (bt
->trace_state
== Blktrace_running
) {
580 bt
->trace_state
= Blktrace_stopped
;
581 relay_flush(bt
->rchan
);
588 EXPORT_SYMBOL_GPL(blk_trace_startstop
);
591 * blk_trace_ioctl: - handle the ioctls associated with tracing
592 * @bdev: the block device
593 * @cmd: the ioctl cmd
594 * @arg: the argument data, if any
597 int blk_trace_ioctl(struct block_device
*bdev
, unsigned cmd
, char __user
*arg
)
599 struct request_queue
*q
;
601 char b
[BDEVNAME_SIZE
];
603 q
= bdev_get_queue(bdev
);
607 mutex_lock(&bdev
->bd_mutex
);
612 ret
= blk_trace_setup(q
, b
, bdev
->bd_dev
, bdev
, arg
);
617 ret
= blk_trace_startstop(q
, start
);
619 case BLKTRACETEARDOWN
:
620 ret
= blk_trace_remove(q
);
627 mutex_unlock(&bdev
->bd_mutex
);
632 * blk_trace_shutdown: - stop and cleanup trace structures
633 * @q: the request queue associated with the device
636 void blk_trace_shutdown(struct request_queue
*q
)
639 blk_trace_startstop(q
, 0);
649 * blk_add_trace_rq - Add a trace for a request oriented action
650 * @q: queue the io is for
651 * @rq: the source request
655 * Records an action against a request. Will log the bio offset + size.
658 static void blk_add_trace_rq(struct request_queue
*q
, struct request
*rq
,
661 struct blk_trace
*bt
= q
->blk_trace
;
662 int rw
= rq
->cmd_flags
& 0x03;
667 if (blk_discard_rq(rq
))
668 rw
|= (1 << BIO_RW_DISCARD
);
670 if (blk_pc_request(rq
)) {
671 what
|= BLK_TC_ACT(BLK_TC_PC
);
672 __blk_add_trace(bt
, 0, blk_rq_bytes(rq
), rw
,
673 what
, rq
->errors
, rq
->cmd_len
, rq
->cmd
);
675 what
|= BLK_TC_ACT(BLK_TC_FS
);
676 __blk_add_trace(bt
, blk_rq_pos(rq
), blk_rq_bytes(rq
), rw
,
677 what
, rq
->errors
, 0, NULL
);
681 static void blk_add_trace_rq_abort(struct request_queue
*q
, struct request
*rq
)
683 blk_add_trace_rq(q
, rq
, BLK_TA_ABORT
);
686 static void blk_add_trace_rq_insert(struct request_queue
*q
, struct request
*rq
)
688 blk_add_trace_rq(q
, rq
, BLK_TA_INSERT
);
691 static void blk_add_trace_rq_issue(struct request_queue
*q
, struct request
*rq
)
693 blk_add_trace_rq(q
, rq
, BLK_TA_ISSUE
);
696 static void blk_add_trace_rq_requeue(struct request_queue
*q
,
699 blk_add_trace_rq(q
, rq
, BLK_TA_REQUEUE
);
702 static void blk_add_trace_rq_complete(struct request_queue
*q
,
705 blk_add_trace_rq(q
, rq
, BLK_TA_COMPLETE
);
709 * blk_add_trace_bio - Add a trace for a bio oriented action
710 * @q: queue the io is for
711 * @bio: the source bio
715 * Records an action against a bio. Will log the bio offset + size.
718 static void blk_add_trace_bio(struct request_queue
*q
, struct bio
*bio
,
721 struct blk_trace
*bt
= q
->blk_trace
;
726 __blk_add_trace(bt
, bio
->bi_sector
, bio
->bi_size
, bio
->bi_rw
, what
,
727 !bio_flagged(bio
, BIO_UPTODATE
), 0, NULL
);
730 static void blk_add_trace_bio_bounce(struct request_queue
*q
, struct bio
*bio
)
732 blk_add_trace_bio(q
, bio
, BLK_TA_BOUNCE
);
735 static void blk_add_trace_bio_complete(struct request_queue
*q
, struct bio
*bio
)
737 blk_add_trace_bio(q
, bio
, BLK_TA_COMPLETE
);
740 static void blk_add_trace_bio_backmerge(struct request_queue
*q
,
743 blk_add_trace_bio(q
, bio
, BLK_TA_BACKMERGE
);
746 static void blk_add_trace_bio_frontmerge(struct request_queue
*q
,
749 blk_add_trace_bio(q
, bio
, BLK_TA_FRONTMERGE
);
752 static void blk_add_trace_bio_queue(struct request_queue
*q
, struct bio
*bio
)
754 blk_add_trace_bio(q
, bio
, BLK_TA_QUEUE
);
757 static void blk_add_trace_getrq(struct request_queue
*q
,
758 struct bio
*bio
, int rw
)
761 blk_add_trace_bio(q
, bio
, BLK_TA_GETRQ
);
763 struct blk_trace
*bt
= q
->blk_trace
;
766 __blk_add_trace(bt
, 0, 0, rw
, BLK_TA_GETRQ
, 0, 0, NULL
);
771 static void blk_add_trace_sleeprq(struct request_queue
*q
,
772 struct bio
*bio
, int rw
)
775 blk_add_trace_bio(q
, bio
, BLK_TA_SLEEPRQ
);
777 struct blk_trace
*bt
= q
->blk_trace
;
780 __blk_add_trace(bt
, 0, 0, rw
, BLK_TA_SLEEPRQ
,
785 static void blk_add_trace_plug(struct request_queue
*q
)
787 struct blk_trace
*bt
= q
->blk_trace
;
790 __blk_add_trace(bt
, 0, 0, 0, BLK_TA_PLUG
, 0, 0, NULL
);
793 static void blk_add_trace_unplug_io(struct request_queue
*q
)
795 struct blk_trace
*bt
= q
->blk_trace
;
798 unsigned int pdu
= q
->rq
.count
[READ
] + q
->rq
.count
[WRITE
];
799 __be64 rpdu
= cpu_to_be64(pdu
);
801 __blk_add_trace(bt
, 0, 0, 0, BLK_TA_UNPLUG_IO
, 0,
802 sizeof(rpdu
), &rpdu
);
806 static void blk_add_trace_unplug_timer(struct request_queue
*q
)
808 struct blk_trace
*bt
= q
->blk_trace
;
811 unsigned int pdu
= q
->rq
.count
[READ
] + q
->rq
.count
[WRITE
];
812 __be64 rpdu
= cpu_to_be64(pdu
);
814 __blk_add_trace(bt
, 0, 0, 0, BLK_TA_UNPLUG_TIMER
, 0,
815 sizeof(rpdu
), &rpdu
);
819 static void blk_add_trace_split(struct request_queue
*q
, struct bio
*bio
,
822 struct blk_trace
*bt
= q
->blk_trace
;
825 __be64 rpdu
= cpu_to_be64(pdu
);
827 __blk_add_trace(bt
, bio
->bi_sector
, bio
->bi_size
, bio
->bi_rw
,
828 BLK_TA_SPLIT
, !bio_flagged(bio
, BIO_UPTODATE
),
829 sizeof(rpdu
), &rpdu
);
834 * blk_add_trace_remap - Add a trace for a remap operation
835 * @q: queue the io is for
836 * @bio: the source bio
837 * @dev: target device
838 * @from: source sector
841 * Device mapper or raid target sometimes need to split a bio because
842 * it spans a stripe (or similar). Add a trace for that action.
845 static void blk_add_trace_remap(struct request_queue
*q
, struct bio
*bio
,
846 dev_t dev
, sector_t from
)
848 struct blk_trace
*bt
= q
->blk_trace
;
849 struct blk_io_trace_remap r
;
854 r
.device_from
= cpu_to_be32(dev
);
855 r
.device_to
= cpu_to_be32(bio
->bi_bdev
->bd_dev
);
856 r
.sector_from
= cpu_to_be64(from
);
858 __blk_add_trace(bt
, bio
->bi_sector
, bio
->bi_size
, bio
->bi_rw
,
859 BLK_TA_REMAP
, !bio_flagged(bio
, BIO_UPTODATE
),
864 * blk_add_driver_data - Add binary message with driver-specific data
865 * @q: queue the io is for
867 * @data: driver-specific data
868 * @len: length of driver-specific data
871 * Some drivers might want to write driver-specific data per request.
874 void blk_add_driver_data(struct request_queue
*q
,
876 void *data
, size_t len
)
878 struct blk_trace
*bt
= q
->blk_trace
;
883 if (blk_pc_request(rq
))
884 __blk_add_trace(bt
, 0, blk_rq_bytes(rq
), 0,
885 BLK_TA_DRV_DATA
, rq
->errors
, len
, data
);
887 __blk_add_trace(bt
, blk_rq_pos(rq
), blk_rq_bytes(rq
), 0,
888 BLK_TA_DRV_DATA
, rq
->errors
, len
, data
);
890 EXPORT_SYMBOL_GPL(blk_add_driver_data
);
892 static void blk_register_tracepoints(void)
896 ret
= register_trace_block_rq_abort(blk_add_trace_rq_abort
);
898 ret
= register_trace_block_rq_insert(blk_add_trace_rq_insert
);
900 ret
= register_trace_block_rq_issue(blk_add_trace_rq_issue
);
902 ret
= register_trace_block_rq_requeue(blk_add_trace_rq_requeue
);
904 ret
= register_trace_block_rq_complete(blk_add_trace_rq_complete
);
906 ret
= register_trace_block_bio_bounce(blk_add_trace_bio_bounce
);
908 ret
= register_trace_block_bio_complete(blk_add_trace_bio_complete
);
910 ret
= register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge
);
912 ret
= register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge
);
914 ret
= register_trace_block_bio_queue(blk_add_trace_bio_queue
);
916 ret
= register_trace_block_getrq(blk_add_trace_getrq
);
918 ret
= register_trace_block_sleeprq(blk_add_trace_sleeprq
);
920 ret
= register_trace_block_plug(blk_add_trace_plug
);
922 ret
= register_trace_block_unplug_timer(blk_add_trace_unplug_timer
);
924 ret
= register_trace_block_unplug_io(blk_add_trace_unplug_io
);
926 ret
= register_trace_block_split(blk_add_trace_split
);
928 ret
= register_trace_block_remap(blk_add_trace_remap
);
932 static void blk_unregister_tracepoints(void)
934 unregister_trace_block_remap(blk_add_trace_remap
);
935 unregister_trace_block_split(blk_add_trace_split
);
936 unregister_trace_block_unplug_io(blk_add_trace_unplug_io
);
937 unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer
);
938 unregister_trace_block_plug(blk_add_trace_plug
);
939 unregister_trace_block_sleeprq(blk_add_trace_sleeprq
);
940 unregister_trace_block_getrq(blk_add_trace_getrq
);
941 unregister_trace_block_bio_queue(blk_add_trace_bio_queue
);
942 unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge
);
943 unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge
);
944 unregister_trace_block_bio_complete(blk_add_trace_bio_complete
);
945 unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce
);
946 unregister_trace_block_rq_complete(blk_add_trace_rq_complete
);
947 unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue
);
948 unregister_trace_block_rq_issue(blk_add_trace_rq_issue
);
949 unregister_trace_block_rq_insert(blk_add_trace_rq_insert
);
950 unregister_trace_block_rq_abort(blk_add_trace_rq_abort
);
952 tracepoint_synchronize_unregister();
956 * struct blk_io_tracer formatting routines
959 static void fill_rwbs(char *rwbs
, const struct blk_io_trace
*t
)
962 int tc
= t
->action
>> BLK_TC_SHIFT
;
964 if (t
->action
== BLK_TN_MESSAGE
) {
969 if (tc
& BLK_TC_DISCARD
)
971 else if (tc
& BLK_TC_WRITE
)
978 if (tc
& BLK_TC_AHEAD
)
980 if (tc
& BLK_TC_BARRIER
)
982 if (tc
& BLK_TC_SYNC
)
984 if (tc
& BLK_TC_META
)
991 const struct blk_io_trace
*te_blk_io_trace(const struct trace_entry
*ent
)
993 return (const struct blk_io_trace
*)ent
;
996 static inline const void *pdu_start(const struct trace_entry
*ent
)
998 return te_blk_io_trace(ent
) + 1;
1001 static inline u32
t_action(const struct trace_entry
*ent
)
1003 return te_blk_io_trace(ent
)->action
;
1006 static inline u32
t_bytes(const struct trace_entry
*ent
)
1008 return te_blk_io_trace(ent
)->bytes
;
1011 static inline u32
t_sec(const struct trace_entry
*ent
)
1013 return te_blk_io_trace(ent
)->bytes
>> 9;
1016 static inline unsigned long long t_sector(const struct trace_entry
*ent
)
1018 return te_blk_io_trace(ent
)->sector
;
1021 static inline __u16
t_error(const struct trace_entry
*ent
)
1023 return te_blk_io_trace(ent
)->error
;
1026 static __u64
get_pdu_int(const struct trace_entry
*ent
)
1028 const __u64
*val
= pdu_start(ent
);
1029 return be64_to_cpu(*val
);
1032 static void get_pdu_remap(const struct trace_entry
*ent
,
1033 struct blk_io_trace_remap
*r
)
1035 const struct blk_io_trace_remap
*__r
= pdu_start(ent
);
1036 __u64 sector_from
= __r
->sector_from
;
1038 r
->device_from
= be32_to_cpu(__r
->device_from
);
1039 r
->device_to
= be32_to_cpu(__r
->device_to
);
1040 r
->sector_from
= be64_to_cpu(sector_from
);
1043 typedef int (blk_log_action_t
) (struct trace_iterator
*iter
, const char *act
);
1045 static int blk_log_action_classic(struct trace_iterator
*iter
, const char *act
)
1048 unsigned long long ts
= iter
->ts
;
1049 unsigned long nsec_rem
= do_div(ts
, NSEC_PER_SEC
);
1050 unsigned secs
= (unsigned long)ts
;
1051 const struct blk_io_trace
*t
= te_blk_io_trace(iter
->ent
);
1055 return trace_seq_printf(&iter
->seq
,
1056 "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ",
1057 MAJOR(t
->device
), MINOR(t
->device
), iter
->cpu
,
1058 secs
, nsec_rem
, iter
->ent
->pid
, act
, rwbs
);
1061 static int blk_log_action(struct trace_iterator
*iter
, const char *act
)
1064 const struct blk_io_trace
*t
= te_blk_io_trace(iter
->ent
);
1067 return trace_seq_printf(&iter
->seq
, "%3d,%-3d %2s %3s ",
1068 MAJOR(t
->device
), MINOR(t
->device
), act
, rwbs
);
1071 static int blk_log_dump_pdu(struct trace_seq
*s
, const struct trace_entry
*ent
)
1073 const unsigned char *pdu_buf
;
1077 pdu_buf
= pdu_start(ent
);
1078 pdu_len
= te_blk_io_trace(ent
)->pdu_len
;
1083 /* find the last zero that needs to be printed */
1084 for (end
= pdu_len
- 1; end
>= 0; end
--)
1089 if (!trace_seq_putc(s
, '('))
1092 for (i
= 0; i
< pdu_len
; i
++) {
1094 ret
= trace_seq_printf(s
, "%s%02x",
1095 i
== 0 ? "" : " ", pdu_buf
[i
]);
1100 * stop when the rest is just zeroes and indicate so
1101 * with a ".." appended
1103 if (i
== end
&& end
!= pdu_len
- 1)
1104 return trace_seq_puts(s
, " ..) ");
1107 return trace_seq_puts(s
, ") ");
1110 static int blk_log_generic(struct trace_seq
*s
, const struct trace_entry
*ent
)
1112 char cmd
[TASK_COMM_LEN
];
1114 trace_find_cmdline(ent
->pid
, cmd
);
1116 if (t_action(ent
) & BLK_TC_ACT(BLK_TC_PC
)) {
1119 ret
= trace_seq_printf(s
, "%u ", t_bytes(ent
));
1122 ret
= blk_log_dump_pdu(s
, ent
);
1125 return trace_seq_printf(s
, "[%s]\n", cmd
);
1128 return trace_seq_printf(s
, "%llu + %u [%s]\n",
1129 t_sector(ent
), t_sec(ent
), cmd
);
1130 return trace_seq_printf(s
, "[%s]\n", cmd
);
1134 static int blk_log_with_error(struct trace_seq
*s
,
1135 const struct trace_entry
*ent
)
1137 if (t_action(ent
) & BLK_TC_ACT(BLK_TC_PC
)) {
1140 ret
= blk_log_dump_pdu(s
, ent
);
1142 return trace_seq_printf(s
, "[%d]\n", t_error(ent
));
1146 return trace_seq_printf(s
, "%llu + %u [%d]\n",
1148 t_sec(ent
), t_error(ent
));
1149 return trace_seq_printf(s
, "%llu [%d]\n",
1150 t_sector(ent
), t_error(ent
));
1154 static int blk_log_remap(struct trace_seq
*s
, const struct trace_entry
*ent
)
1156 struct blk_io_trace_remap r
= { .device_from
= 0, };
1158 get_pdu_remap(ent
, &r
);
1159 return trace_seq_printf(s
, "%llu + %u <- (%d,%d) %llu\n",
1160 t_sector(ent
), t_sec(ent
),
1161 MAJOR(r
.device_from
), MINOR(r
.device_from
),
1162 (unsigned long long)r
.sector_from
);
1165 static int blk_log_plug(struct trace_seq
*s
, const struct trace_entry
*ent
)
1167 char cmd
[TASK_COMM_LEN
];
1169 trace_find_cmdline(ent
->pid
, cmd
);
1171 return trace_seq_printf(s
, "[%s]\n", cmd
);
1174 static int blk_log_unplug(struct trace_seq
*s
, const struct trace_entry
*ent
)
1176 char cmd
[TASK_COMM_LEN
];
1178 trace_find_cmdline(ent
->pid
, cmd
);
1180 return trace_seq_printf(s
, "[%s] %llu\n", cmd
, get_pdu_int(ent
));
1183 static int blk_log_split(struct trace_seq
*s
, const struct trace_entry
*ent
)
1185 char cmd
[TASK_COMM_LEN
];
1187 trace_find_cmdline(ent
->pid
, cmd
);
1189 return trace_seq_printf(s
, "%llu / %llu [%s]\n", t_sector(ent
),
1190 get_pdu_int(ent
), cmd
);
1193 static int blk_log_msg(struct trace_seq
*s
, const struct trace_entry
*ent
)
1196 const struct blk_io_trace
*t
= te_blk_io_trace(ent
);
1198 ret
= trace_seq_putmem(s
, t
+ 1, t
->pdu_len
);
1200 return trace_seq_putc(s
, '\n');
1205 * struct tracer operations
1208 static void blk_tracer_print_header(struct seq_file
*m
)
1210 if (!(blk_tracer_flags
.val
& TRACE_BLK_OPT_CLASSIC
))
1212 seq_puts(m
, "# DEV CPU TIMESTAMP PID ACT FLG\n"
1216 static void blk_tracer_start(struct trace_array
*tr
)
1218 blk_tracer_enabled
= true;
1221 static int blk_tracer_init(struct trace_array
*tr
)
1224 blk_tracer_start(tr
);
1228 static void blk_tracer_stop(struct trace_array
*tr
)
1230 blk_tracer_enabled
= false;
1233 static void blk_tracer_reset(struct trace_array
*tr
)
1235 blk_tracer_stop(tr
);
1238 static const struct {
1240 int (*print
)(struct trace_seq
*s
, const struct trace_entry
*ent
);
1242 [__BLK_TA_QUEUE
] = {{ "Q", "queue" }, blk_log_generic
},
1243 [__BLK_TA_BACKMERGE
] = {{ "M", "backmerge" }, blk_log_generic
},
1244 [__BLK_TA_FRONTMERGE
] = {{ "F", "frontmerge" }, blk_log_generic
},
1245 [__BLK_TA_GETRQ
] = {{ "G", "getrq" }, blk_log_generic
},
1246 [__BLK_TA_SLEEPRQ
] = {{ "S", "sleeprq" }, blk_log_generic
},
1247 [__BLK_TA_REQUEUE
] = {{ "R", "requeue" }, blk_log_with_error
},
1248 [__BLK_TA_ISSUE
] = {{ "D", "issue" }, blk_log_generic
},
1249 [__BLK_TA_COMPLETE
] = {{ "C", "complete" }, blk_log_with_error
},
1250 [__BLK_TA_PLUG
] = {{ "P", "plug" }, blk_log_plug
},
1251 [__BLK_TA_UNPLUG_IO
] = {{ "U", "unplug_io" }, blk_log_unplug
},
1252 [__BLK_TA_UNPLUG_TIMER
] = {{ "UT", "unplug_timer" }, blk_log_unplug
},
1253 [__BLK_TA_INSERT
] = {{ "I", "insert" }, blk_log_generic
},
1254 [__BLK_TA_SPLIT
] = {{ "X", "split" }, blk_log_split
},
1255 [__BLK_TA_BOUNCE
] = {{ "B", "bounce" }, blk_log_generic
},
1256 [__BLK_TA_REMAP
] = {{ "A", "remap" }, blk_log_remap
},
1259 static enum print_line_t
print_one_line(struct trace_iterator
*iter
,
1262 struct trace_seq
*s
= &iter
->seq
;
1263 const struct blk_io_trace
*t
;
1267 blk_log_action_t
*log_action
;
1269 t
= te_blk_io_trace(iter
->ent
);
1270 what
= t
->action
& ((1 << BLK_TC_SHIFT
) - 1);
1271 long_act
= !!(trace_flags
& TRACE_ITER_VERBOSE
);
1272 log_action
= classic
? &blk_log_action_classic
: &blk_log_action
;
1274 if (t
->action
== BLK_TN_MESSAGE
) {
1275 ret
= log_action(iter
, long_act
? "message" : "m");
1277 ret
= blk_log_msg(s
, iter
->ent
);
1281 if (unlikely(what
== 0 || what
>= ARRAY_SIZE(what2act
)))
1282 ret
= trace_seq_printf(s
, "Unknown action %x\n", what
);
1284 ret
= log_action(iter
, what2act
[what
].act
[long_act
]);
1286 ret
= what2act
[what
].print(s
, iter
->ent
);
1289 return ret
? TRACE_TYPE_HANDLED
: TRACE_TYPE_PARTIAL_LINE
;
1292 static enum print_line_t
blk_trace_event_print(struct trace_iterator
*iter
,
1295 return print_one_line(iter
, false);
1298 static int blk_trace_synthesize_old_trace(struct trace_iterator
*iter
)
1300 struct trace_seq
*s
= &iter
->seq
;
1301 struct blk_io_trace
*t
= (struct blk_io_trace
*)iter
->ent
;
1302 const int offset
= offsetof(struct blk_io_trace
, sector
);
1303 struct blk_io_trace old
= {
1304 .magic
= BLK_IO_TRACE_MAGIC
| BLK_IO_TRACE_VERSION
,
1308 if (!trace_seq_putmem(s
, &old
, offset
))
1310 return trace_seq_putmem(s
, &t
->sector
,
1311 sizeof(old
) - offset
+ t
->pdu_len
);
1314 static enum print_line_t
1315 blk_trace_event_print_binary(struct trace_iterator
*iter
, int flags
)
1317 return blk_trace_synthesize_old_trace(iter
) ?
1318 TRACE_TYPE_HANDLED
: TRACE_TYPE_PARTIAL_LINE
;
1321 static enum print_line_t
blk_tracer_print_line(struct trace_iterator
*iter
)
1323 if (!(blk_tracer_flags
.val
& TRACE_BLK_OPT_CLASSIC
))
1324 return TRACE_TYPE_UNHANDLED
;
1326 return print_one_line(iter
, true);
1329 static int blk_tracer_set_flag(u32 old_flags
, u32 bit
, int set
)
1331 /* don't output context-info for blk_classic output */
1332 if (bit
== TRACE_BLK_OPT_CLASSIC
) {
1334 trace_flags
&= ~TRACE_ITER_CONTEXT_INFO
;
1336 trace_flags
|= TRACE_ITER_CONTEXT_INFO
;
1341 static struct tracer blk_tracer __read_mostly
= {
1343 .init
= blk_tracer_init
,
1344 .reset
= blk_tracer_reset
,
1345 .start
= blk_tracer_start
,
1346 .stop
= blk_tracer_stop
,
1347 .print_header
= blk_tracer_print_header
,
1348 .print_line
= blk_tracer_print_line
,
1349 .flags
= &blk_tracer_flags
,
1350 .set_flag
= blk_tracer_set_flag
,
1353 static struct trace_event trace_blk_event
= {
1355 .trace
= blk_trace_event_print
,
1356 .binary
= blk_trace_event_print_binary
,
1359 static int __init
init_blk_tracer(void)
1361 if (!register_ftrace_event(&trace_blk_event
)) {
1362 pr_warning("Warning: could not register block events\n");
1366 if (register_tracer(&blk_tracer
) != 0) {
1367 pr_warning("Warning: could not register the block tracer\n");
1368 unregister_ftrace_event(&trace_blk_event
);
1375 device_initcall(init_blk_tracer
);
1377 static int blk_trace_remove_queue(struct request_queue
*q
)
1379 struct blk_trace
*bt
;
1381 bt
= xchg(&q
->blk_trace
, NULL
);
1385 if (atomic_dec_and_test(&blk_probes_ref
))
1386 blk_unregister_tracepoints();
1393 * Setup everything required to start tracing
1395 static int blk_trace_setup_queue(struct request_queue
*q
,
1396 struct block_device
*bdev
)
1398 struct blk_trace
*old_bt
, *bt
= NULL
;
1401 bt
= kzalloc(sizeof(*bt
), GFP_KERNEL
);
1405 bt
->msg_data
= __alloc_percpu(BLK_TN_MAX_MSG
, __alignof__(char));
1409 bt
->dev
= bdev
->bd_dev
;
1410 bt
->act_mask
= (u16
)-1;
1412 blk_trace_setup_lba(bt
, bdev
);
1414 old_bt
= xchg(&q
->blk_trace
, bt
);
1415 if (old_bt
!= NULL
) {
1416 (void)xchg(&q
->blk_trace
, old_bt
);
1421 if (atomic_inc_return(&blk_probes_ref
) == 1)
1422 blk_register_tracepoints();
1431 * sysfs interface to enable and configure tracing
1434 static ssize_t
sysfs_blk_trace_attr_show(struct device
*dev
,
1435 struct device_attribute
*attr
,
1437 static ssize_t
sysfs_blk_trace_attr_store(struct device
*dev
,
1438 struct device_attribute
*attr
,
1439 const char *buf
, size_t count
);
1440 #define BLK_TRACE_DEVICE_ATTR(_name) \
1441 DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \
1442 sysfs_blk_trace_attr_show, \
1443 sysfs_blk_trace_attr_store)
1445 static BLK_TRACE_DEVICE_ATTR(enable
);
1446 static BLK_TRACE_DEVICE_ATTR(act_mask
);
1447 static BLK_TRACE_DEVICE_ATTR(pid
);
1448 static BLK_TRACE_DEVICE_ATTR(start_lba
);
1449 static BLK_TRACE_DEVICE_ATTR(end_lba
);
1451 static struct attribute
*blk_trace_attrs
[] = {
1452 &dev_attr_enable
.attr
,
1453 &dev_attr_act_mask
.attr
,
1455 &dev_attr_start_lba
.attr
,
1456 &dev_attr_end_lba
.attr
,
1460 struct attribute_group blk_trace_attr_group
= {
1462 .attrs
= blk_trace_attrs
,
1465 static const struct {
1469 { BLK_TC_READ
, "read" },
1470 { BLK_TC_WRITE
, "write" },
1471 { BLK_TC_BARRIER
, "barrier" },
1472 { BLK_TC_SYNC
, "sync" },
1473 { BLK_TC_QUEUE
, "queue" },
1474 { BLK_TC_REQUEUE
, "requeue" },
1475 { BLK_TC_ISSUE
, "issue" },
1476 { BLK_TC_COMPLETE
, "complete" },
1477 { BLK_TC_FS
, "fs" },
1478 { BLK_TC_PC
, "pc" },
1479 { BLK_TC_AHEAD
, "ahead" },
1480 { BLK_TC_META
, "meta" },
1481 { BLK_TC_DISCARD
, "discard" },
1482 { BLK_TC_DRV_DATA
, "drv_data" },
1485 static int blk_trace_str2mask(const char *str
)
1489 char *buf
, *s
, *token
;
1491 buf
= kstrdup(str
, GFP_KERNEL
);
1497 token
= strsep(&s
, ",");
1504 for (i
= 0; i
< ARRAY_SIZE(mask_maps
); i
++) {
1505 if (strcasecmp(token
, mask_maps
[i
].str
) == 0) {
1506 mask
|= mask_maps
[i
].mask
;
1510 if (i
== ARRAY_SIZE(mask_maps
)) {
1520 static ssize_t
blk_trace_mask2str(char *buf
, int mask
)
1525 for (i
= 0; i
< ARRAY_SIZE(mask_maps
); i
++) {
1526 if (mask
& mask_maps
[i
].mask
) {
1527 p
+= sprintf(p
, "%s%s",
1528 (p
== buf
) ? "" : ",", mask_maps
[i
].str
);
1536 static struct request_queue
*blk_trace_get_queue(struct block_device
*bdev
)
1538 if (bdev
->bd_disk
== NULL
)
1541 return bdev_get_queue(bdev
);
1544 static ssize_t
sysfs_blk_trace_attr_show(struct device
*dev
,
1545 struct device_attribute
*attr
,
1548 struct hd_struct
*p
= dev_to_part(dev
);
1549 struct request_queue
*q
;
1550 struct block_device
*bdev
;
1551 ssize_t ret
= -ENXIO
;
1554 bdev
= bdget(part_devt(p
));
1556 goto out_unlock_kernel
;
1558 q
= blk_trace_get_queue(bdev
);
1562 mutex_lock(&bdev
->bd_mutex
);
1564 if (attr
== &dev_attr_enable
) {
1565 ret
= sprintf(buf
, "%u\n", !!q
->blk_trace
);
1566 goto out_unlock_bdev
;
1569 if (q
->blk_trace
== NULL
)
1570 ret
= sprintf(buf
, "disabled\n");
1571 else if (attr
== &dev_attr_act_mask
)
1572 ret
= blk_trace_mask2str(buf
, q
->blk_trace
->act_mask
);
1573 else if (attr
== &dev_attr_pid
)
1574 ret
= sprintf(buf
, "%u\n", q
->blk_trace
->pid
);
1575 else if (attr
== &dev_attr_start_lba
)
1576 ret
= sprintf(buf
, "%llu\n", q
->blk_trace
->start_lba
);
1577 else if (attr
== &dev_attr_end_lba
)
1578 ret
= sprintf(buf
, "%llu\n", q
->blk_trace
->end_lba
);
1581 mutex_unlock(&bdev
->bd_mutex
);
1589 static ssize_t
sysfs_blk_trace_attr_store(struct device
*dev
,
1590 struct device_attribute
*attr
,
1591 const char *buf
, size_t count
)
1593 struct block_device
*bdev
;
1594 struct request_queue
*q
;
1595 struct hd_struct
*p
;
1597 ssize_t ret
= -EINVAL
;
1602 if (attr
== &dev_attr_act_mask
) {
1603 if (sscanf(buf
, "%llx", &value
) != 1) {
1604 /* Assume it is a list of trace category names */
1605 ret
= blk_trace_str2mask(buf
);
1610 } else if (sscanf(buf
, "%llu", &value
) != 1)
1616 p
= dev_to_part(dev
);
1617 bdev
= bdget(part_devt(p
));
1619 goto out_unlock_kernel
;
1621 q
= blk_trace_get_queue(bdev
);
1625 mutex_lock(&bdev
->bd_mutex
);
1627 if (attr
== &dev_attr_enable
) {
1629 ret
= blk_trace_setup_queue(q
, bdev
);
1631 ret
= blk_trace_remove_queue(q
);
1632 goto out_unlock_bdev
;
1636 if (q
->blk_trace
== NULL
)
1637 ret
= blk_trace_setup_queue(q
, bdev
);
1640 if (attr
== &dev_attr_act_mask
)
1641 q
->blk_trace
->act_mask
= value
;
1642 else if (attr
== &dev_attr_pid
)
1643 q
->blk_trace
->pid
= value
;
1644 else if (attr
== &dev_attr_start_lba
)
1645 q
->blk_trace
->start_lba
= value
;
1646 else if (attr
== &dev_attr_end_lba
)
1647 q
->blk_trace
->end_lba
= value
;
1651 mutex_unlock(&bdev
->bd_mutex
);
1657 return ret
? ret
: count
;
1660 int blk_trace_init_sysfs(struct device
*dev
)
1662 return sysfs_create_group(&dev
->kobj
, &blk_trace_attr_group
);
1665 #endif /* CONFIG_BLK_DEV_IO_TRACE */
1667 #ifdef CONFIG_EVENT_TRACING
1669 void blk_dump_cmd(char *buf
, struct request
*rq
)
1672 int len
= rq
->cmd_len
;
1673 unsigned char *cmd
= rq
->cmd
;
1675 if (!blk_pc_request(rq
)) {
1680 for (end
= len
- 1; end
>= 0; end
--)
1685 for (i
= 0; i
< len
; i
++) {
1686 buf
+= sprintf(buf
, "%s%02x", i
== 0 ? "" : " ", cmd
[i
]);
1687 if (i
== end
&& end
!= len
- 1) {
1688 sprintf(buf
, " ..");
1694 void blk_fill_rwbs(char *rwbs
, u32 rw
, int bytes
)
1700 else if (rw
& 1 << BIO_RW_DISCARD
)
1707 if (rw
& 1 << BIO_RW_AHEAD
)
1709 if (rw
& 1 << BIO_RW_BARRIER
)
1711 if (rw
& 1 << BIO_RW_SYNCIO
)
1713 if (rw
& 1 << BIO_RW_META
)
1719 void blk_fill_rwbs_rq(char *rwbs
, struct request
*rq
)
1721 int rw
= rq
->cmd_flags
& 0x03;
1724 if (blk_discard_rq(rq
))
1725 rw
|= (1 << BIO_RW_DISCARD
);
1727 bytes
= blk_rq_bytes(rq
);
1729 blk_fill_rwbs(rwbs
, rw
, bytes
);
1732 #endif /* CONFIG_EVENT_TRACING */