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authorJens Axboe <axboe@fb.com>2017-02-17 14:08:19 -0700
committerJens Axboe <axboe@fb.com>2017-02-17 14:08:19 -0700
commit818551e2b2c662a1b26de6b4f7d6b8411a838d18 (patch)
treef38b4c951df4d33db81ae7b7765a56bce491c2a8 /kernel/trace
parent6010720da8aab51f33beee63b73cf88016e9b250 (diff)
parent7520872c0cf4d3df6d74242c6edfb9e70a47df4d (diff)
Merge branch 'for-4.11/next' into for-4.11/linus-merge
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/blktrace.c78
1 files changed, 21 insertions, 57 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 95cecbf67f5c..b2058a7f94bd 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -28,6 +28,8 @@
#include <linux/uaccess.h>
#include <linux/list.h>
+#include "../../block/blk.h"
+
#include <trace/events/block.h>
#include "trace_output.h"
@@ -292,9 +294,6 @@ record_it:
local_irq_restore(flags);
}
-static struct dentry *blk_tree_root;
-static DEFINE_MUTEX(blk_tree_mutex);
-
static void blk_trace_free(struct blk_trace *bt)
{
debugfs_remove(bt->msg_file);
@@ -433,9 +432,9 @@ static void blk_trace_setup_lba(struct blk_trace *bt,
/*
* Setup everything required to start tracing
*/
-int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
- struct block_device *bdev,
- struct blk_user_trace_setup *buts)
+static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
+ struct block_device *bdev,
+ struct blk_user_trace_setup *buts)
{
struct blk_trace *bt = NULL;
struct dentry *dir = NULL;
@@ -468,22 +467,15 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
ret = -ENOENT;
- mutex_lock(&blk_tree_mutex);
- if (!blk_tree_root) {
- blk_tree_root = debugfs_create_dir("block", NULL);
- if (!blk_tree_root) {
- mutex_unlock(&blk_tree_mutex);
- goto err;
- }
- }
- mutex_unlock(&blk_tree_mutex);
-
- dir = debugfs_create_dir(buts->name, blk_tree_root);
+ if (!blk_debugfs_root)
+ goto err;
+ dir = debugfs_lookup(buts->name, blk_debugfs_root);
+ if (!dir)
+ bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root);
if (!dir)
goto err;
- bt->dir = dir;
bt->dev = dev;
atomic_set(&bt->dropped, 0);
INIT_LIST_HEAD(&bt->running_list);
@@ -525,9 +517,12 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
if (atomic_inc_return(&blk_probes_ref) == 1)
blk_register_tracepoints();
- return 0;
+ ret = 0;
err:
- blk_trace_free(bt);
+ if (dir && !bt->dir)
+ dput(dir);
+ if (ret)
+ blk_trace_free(bt);
return ret;
}
@@ -712,15 +707,13 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
if (likely(!bt))
return;
- if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
+ if (blk_rq_is_passthrough(rq))
what |= BLK_TC_ACT(BLK_TC_PC);
- __blk_add_trace(bt, 0, nr_bytes, req_op(rq), rq->cmd_flags,
- what, rq->errors, rq->cmd_len, rq->cmd);
- } else {
+ else
what |= BLK_TC_ACT(BLK_TC_FS);
- __blk_add_trace(bt, blk_rq_pos(rq), nr_bytes, req_op(rq),
- rq->cmd_flags, what, rq->errors, 0, NULL);
- }
+
+ __blk_add_trace(bt, blk_rq_trace_sector(rq), nr_bytes, req_op(rq),
+ rq->cmd_flags, what, rq->errors, 0, NULL);
}
static void blk_add_trace_rq_abort(void *ignore,
@@ -972,11 +965,7 @@ void blk_add_driver_data(struct request_queue *q,
if (likely(!bt))
return;
- if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
- __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 0,
- BLK_TA_DRV_DATA, rq->errors, len, data);
- else
- __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 0,
+ __blk_add_trace(bt, blk_rq_trace_sector(rq), blk_rq_bytes(rq), 0, 0,
BLK_TA_DRV_DATA, rq->errors, len, data);
}
EXPORT_SYMBOL_GPL(blk_add_driver_data);
@@ -1752,31 +1741,6 @@ void blk_trace_remove_sysfs(struct device *dev)
#ifdef CONFIG_EVENT_TRACING
-void blk_dump_cmd(char *buf, struct request *rq)
-{
- int i, end;
- int len = rq->cmd_len;
- unsigned char *cmd = rq->cmd;
-
- if (rq->cmd_type != REQ_TYPE_BLOCK_PC) {
- buf[0] = '\0';
- return;
- }
-
- for (end = len - 1; end >= 0; end--)
- if (cmd[end])
- break;
- end++;
-
- for (i = 0; i < len; i++) {
- buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]);
- if (i == end && end != len - 1) {
- sprintf(buf, " ..");
- break;
- }
- }
-}
-
void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes)
{
int i = 0;