From: Omar Sandoval <osandov@xxxxxx>
When I added the blk-mq debugging information to debugfs, I didn't
notice that blktrace also creates a "block" directory in debugfs. Make
them use the same dentry, now created in the core block code. Based on a
patch from Jens.
Signed-off-by: Omar Sandoval <osandov@xxxxxx>
---
block/blk-core.c | 9 +++++++++
block/blk-mq-debugfs.c | 12 +++---------
block/blk-mq.c | 2 --
block/blk-mq.h | 5 -----
block/blk.h | 4 ++++
kernel/trace/blktrace.c | 18 +++++-------------
6 files changed, 21 insertions(+), 29 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 02833ce5664e..16d3b06c743c 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -33,6 +33,7 @@
#include <linux/ratelimit.h>
#include <linux/pm_runtime.h>
#include <linux/blk-cgroup.h>
+#include <linux/debugfs.h>
#define CREATE_TRACE_POINTS
#include <trace/events/block.h>
@@ -42,6 +43,10 @@
#include "blk-mq-sched.h"
#include "blk-wbt.h"
+#ifdef CONFIG_DEBUG_FS
+struct dentry *blk_debugfs_root;
+#endif
+
EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap);
EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap);
EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete);
@@ -3482,5 +3487,9 @@ int __init blk_dev_init(void)
blk_requestq_cachep = kmem_cache_create("request_queue",
sizeof(struct request_queue), 0, SLAB_PANIC, NULL);
+#ifdef CONFIG_DEBUG_FS
+ blk_debugfs_root = debugfs_create_dir("block", NULL);
+#endif
+
return 0;
}
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 5cd2b435a9f5..0cd29b99068c 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -19,6 +19,7 @@
#include <linux/debugfs.h>
#include <linux/blk-mq.h>
+#include "blk.h"
#include "blk-mq.h"
#include "blk-mq-tag.h"
@@ -28,8 +29,6 @@ struct blk_mq_debugfs_attr {
const struct file_operations *fops;
};
-static struct dentry *block_debugfs_root;
-
static int blk_mq_debugfs_seq_open(struct inode *inode, struct file *file,
const struct seq_operations *ops)
{
@@ -641,10 +640,10 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
int blk_mq_debugfs_register(struct request_queue *q, const char *name)
{
- if (!block_debugfs_root)
+ if (!blk_debugfs_root)
return -ENOENT;
- q->debugfs_dir = debugfs_create_dir(name, block_debugfs_root);
+ q->debugfs_dir = debugfs_create_dir(name, blk_debugfs_root);
if (!q->debugfs_dir)
goto err;
@@ -749,8 +748,3 @@ void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
debugfs_remove_recursive(q->mq_debugfs_dir);
q->mq_debugfs_dir = NULL;
}
-
-void blk_mq_debugfs_init(void)
-{
- block_debugfs_root = debugfs_create_dir("block", NULL);
-}
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 60dac10228fe..ff70219c5afd 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2827,8 +2827,6 @@ void blk_mq_enable_hotplug(void)
static int __init blk_mq_init(void)
{
- blk_mq_debugfs_init();
-
cpuhp_setup_state_multi(CPUHP_BLK_MQ_DEAD, "block/mq:dead", NULL,
blk_mq_hctx_notify_dead);
diff --git a/block/blk-mq.h b/block/blk-mq.h
index b52abd62b1b0..24b2256186f3 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -85,16 +85,11 @@ extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
* debugfs helpers
*/
#ifdef CONFIG_BLK_DEBUG_FS
-void blk_mq_debugfs_init(void);
int blk_mq_debugfs_register(struct request_queue *q, const char *name);
void blk_mq_debugfs_unregister(struct request_queue *q);
int blk_mq_debugfs_register_hctxs(struct request_queue *q);
void blk_mq_debugfs_unregister_hctxs(struct request_queue *q);
#else
-static inline void blk_mq_debugfs_init(void)
-{
-}
-
static inline int blk_mq_debugfs_register(struct request_queue *q,
const char *name)
{
diff --git a/block/blk.h b/block/blk.h
index 9a716b5925a4..22283b05fe33 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -14,6 +14,10 @@
/* Max future timer expiry for timeouts */
#define BLK_MAX_TIMEOUT (5 * HZ)
+#ifdef CONFIG_DEBUG_FS
+extern struct dentry *blk_debugfs_root;
+#endif
+
struct blk_flush_queue {
unsigned int flush_queue_delayed:1;
unsigned int flush_pending_idx:1;
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 83d3b5b58f53..38052f625a0f 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 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
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);
@@ -468,17 +467,10 @@ static 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);
+ if (!blk_debugfs_root)
+ goto err;
- dir = debugfs_create_dir(buts->name, blk_tree_root);
+ dir = debugfs_create_dir(buts->name, blk_debugfs_root);
if (!dir)
goto err;
--
2.11.0
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