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blktrace: factor out recording a blktrace event

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Factor out the recording of a blktrace event into its own function,
deduplicating the code.

This also enables recording different versions of the blktrace protocol
later on.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Johannes Thumshirn
2025-10-22 13:41:01 +02:00
committed by Jens Axboe
parent a65988a0ad
commit 472eca5383
1 changed files with 47 additions and 38 deletions
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85
kernel/trace/blktrace.c
View File

@@ -63,6 +63,34 @@ static int blk_probes_ref;
static void blk_register_tracepoints(void);
static void blk_unregister_tracepoints(void);
static void record_blktrace_event(struct blk_io_trace *t, pid_t pid, int cpu,
sector_t sector, int bytes, u32 what,
dev_t dev, int error, u64 cgid,
ssize_t cgid_len, void *pdu_data, int pdu_len)
{
/*
* These two are not needed in ftrace as they are in the
* generic trace_entry, filled by tracing_generic_entry_update,
* but for the trace_event->bin() synthesizer benefit we do it
* here too.
*/
t->cpu = cpu;
t->pid = pid;
t->sector = sector;
t->bytes = bytes;
t->action = what;
t->device = dev;
t->error = error;
t->pdu_len = pdu_len + cgid_len;
if (cgid_len)
memcpy((void *)t + sizeof(*t), &cgid, cgid_len);
if (pdu_len)
memcpy((void *)t + sizeof(*t) + cgid_len, pdu_data, pdu_len);
}
/*
* Send out a notify message.
*/
@@ -87,7 +115,12 @@ static void trace_note(struct blk_trace *bt, pid_t pid, int action,
if (!event)
return;
t = ring_buffer_event_data(event);
goto record_it;
record_blktrace_event(t, pid, cpu, 0, 0,
action | (cgid ? __BLK_TN_CGROUP : 0),
bt->dev, 0, cgid, cgid_len, (void *)data,
len);
trace_buffer_unlock_commit(blk_tr, buffer, event, trace_ctx);
return;
}
if (!bt->rchan)
@@ -97,18 +130,11 @@ static void trace_note(struct blk_trace *bt, pid_t pid, int action,
if (t) {
t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
t->time = ktime_to_ns(ktime_get());
record_it:
t->device = bt->dev;
t->action = action | (cgid ? __BLK_TN_CGROUP : 0);
t->pid = pid;
t->cpu = cpu;
t->pdu_len = len + cgid_len;
if (cgid_len)
memcpy((void *)t + sizeof(*t), &cgid, cgid_len);
memcpy((void *) t + sizeof(*t) + cgid_len, data, len);
if (blk_tracer)
trace_buffer_unlock_commit(blk_tr, buffer, event, trace_ctx);
record_blktrace_event(t, pid, cpu, 0, 0,
action | (cgid ? __BLK_TN_CGROUP : 0),
bt->dev, 0, cgid, cgid_len, (void *)data,
len);
}
}
@@ -263,7 +289,12 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
if (!event)
return;
t = ring_buffer_event_data(event);
goto record_it;
record_blktrace_event(t, pid, cpu, sector, bytes, what, bt->dev,
error, cgid, cgid_len, pdu_data, pdu_len);
trace_buffer_unlock_commit(blk_tr, buffer, event, trace_ctx);
return;
}
if (unlikely(tsk->btrace_seq != blktrace_seq))
@@ -282,32 +313,10 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
t->sequence = ++(*sequence);
t->time = ktime_to_ns(ktime_get());
record_it:
/*
* These two are not needed in ftrace as they are in the
* generic trace_entry, filled by tracing_generic_entry_update,
* but for the trace_event->bin() synthesizer benefit we do it
* here too.
*/
t->cpu = cpu;
t->pid = pid;
t->sector = sector;
t->bytes = bytes;
t->action = what;
t->device = bt->dev;
t->error = error;
t->pdu_len = pdu_len + cgid_len;
if (cgid_len)
memcpy((void *)t + sizeof(*t), &cgid, cgid_len);
if (pdu_len)
memcpy((void *)t + sizeof(*t) + cgid_len, pdu_data, pdu_len);
if (blk_tracer) {
trace_buffer_unlock_commit(blk_tr, buffer, event, trace_ctx);
return;
}
record_blktrace_event(t, pid, cpu, sector, bytes, what,
bt->dev, error, cgid, cgid_len,
pdu_data, pdu_len);
}
local_irq_restore(flags);