On 01/15/2014 08:25 PM, David Sterba wrote:
Help during debugging to export various interesting infromation and
tunables without the need of extra mount options or ioctls.
Usage:
* declare your variable in sysfs.h, and include where you need it
* define the variable in sysfs.c and make it visible via
debugfs_create_TYPE
Depends on CONFIG_DEBUG_FS.
Signed-off-by: David Sterba <dste...@suse.cz>
---
fs/btrfs/sysfs.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index ba94b277e98d..d0023196e996 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -24,6 +24,7 @@
#include <linux/kobject.h>
#include <linux/bug.h>
#include <linux/genhd.h>
+#include <linux/debugfs.h>
#include "ctree.h"
#include "disk-io.h"
@@ -593,6 +594,12 @@ static int add_device_membership(struct btrfs_fs_info
*fs_info)
/* /sys/fs/btrfs/ entry */
static struct kset *btrfs_kset;
+/* /sys/kernel/debug/btrfs */
+static struct dentry *btrfs_debugfs_root_dentry;
+
+/* Debugging tunables and exported data */
+u64 btrfs_debugfs_test;
+
int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
{
int error;
@@ -636,6 +643,18 @@ failure:
return error;
}
+static int btrfs_init_debugfs(void)
+{
+#ifdef CONFIG_DEBUG_FS
+ btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
+ if (!btrfs_debugfs_root_dentry)
+ return -ENOMEM;
+
+ debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry,
+ &btrfs_debugfs_test);
+#endif
Need to return a value.
Josef
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