Lines Matching defs:bt
34 static void trace_note(struct blk_trace *bt, pid_t pid, int action,
39 t = relay_reserve(bt->rchan, sizeof(*t) + len);
45 t->device = bt->dev;
58 static void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk)
61 trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm));
64 static void trace_note_time(struct blk_trace *bt)
75 trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words));
79 static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
82 if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
84 if (sector < bt->start_lba || sector > bt->end_lba)
86 if (bt->pid && pid != bt->pid)
119 void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
129 if (unlikely(bt->trace_state != Blktrace_running))
139 if (unlikely(act_log_check(bt, what, sector, pid)))
153 trace_note_tsk(bt, tsk);
155 t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len);
158 sequence = per_cpu_ptr(bt->sequence, cpu);
167 t->device = bt->dev;
225 static void blk_trace_cleanup(struct blk_trace *bt)
227 relay_close(bt->rchan);
228 debugfs_remove(bt->dropped_file);
229 blk_remove_tree(bt->dir);
230 free_percpu(bt->sequence);
231 kfree(bt);
236 struct blk_trace *bt;
238 bt = xchg(&q->blk_trace, NULL);
239 if (!bt)
242 if (bt->trace_state == Blktrace_setup ||
243 bt->trace_state == Blktrace_stopped)
244 blk_trace_cleanup(bt);
259 struct blk_trace *bt = filp->private_data;
262 snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped));
280 struct blk_trace *bt;
285 bt = buf->chan->private_data;
286 atomic_inc(&bt->dropped);
319 struct blk_trace *old_bt, *bt = NULL;
344 bt = kzalloc(sizeof(*bt), GFP_KERNEL);
345 if (!bt)
348 bt->sequence = alloc_percpu(unsigned long);
349 if (!bt->sequence)
357 bt->dir = dir;
358 bt->dev = bdev->bd_dev;
359 atomic_set(&bt->dropped, 0);
362 bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, &blk_dropped_fops);
363 if (!bt->dropped_file)
366 bt->rchan = relay_open("trace", dir, buts.buf_size, buts.buf_nr, &blk_relay_callbacks, bt);
367 if (!bt->rchan)
370 bt->act_mask = buts.act_mask;
371 if (!bt->act_mask)
372 bt->act_mask = (u16) -1;
374 bt->start_lba = buts.start_lba;
375 bt->end_lba = buts.end_lba;
376 if (!bt->end_lba)
377 bt->end_lba = -1ULL;
379 bt->pid = buts.pid;
380 bt->trace_state = Blktrace_setup;
383 old_bt = xchg(&q->blk_trace, bt);
393 if (bt) {
394 if (bt->dropped_file)
395 debugfs_remove(bt->dropped_file);
396 free_percpu(bt->sequence);
397 if (bt->rchan)
398 relay_close(bt->rchan);
399 kfree(bt);
406 struct blk_trace *bt;
409 if ((bt = q->blk_trace) == NULL)
418 if (bt->trace_state == Blktrace_setup ||
419 bt->trace_state == Blktrace_stopped) {
422 bt->trace_state = Blktrace_running;
424 trace_note_time(bt);
428 if (bt->trace_state == Blktrace_running) {
429 bt->trace_state = Blktrace_stopped;
430 relay_flush(bt->rchan);