btrfs: add simple debugfs interface
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 <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
parent
ace0105076
commit
1bae30982b
@ -24,6 +24,7 @@
|
|||||||
#include <linux/kobject.h>
|
#include <linux/kobject.h>
|
||||||
#include <linux/bug.h>
|
#include <linux/bug.h>
|
||||||
#include <linux/genhd.h>
|
#include <linux/genhd.h>
|
||||||
|
#include <linux/debugfs.h>
|
||||||
|
|
||||||
#include "ctree.h"
|
#include "ctree.h"
|
||||||
#include "disk-io.h"
|
#include "disk-io.h"
|
||||||
@ -599,6 +600,12 @@ static int add_device_membership(struct btrfs_fs_info *fs_info)
|
|||||||
/* /sys/fs/btrfs/ entry */
|
/* /sys/fs/btrfs/ entry */
|
||||||
static struct kset *btrfs_kset;
|
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 btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
|
||||||
{
|
{
|
||||||
int error;
|
int error;
|
||||||
@ -642,27 +649,41 @@ failure:
|
|||||||
return error;
|
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
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
int btrfs_init_sysfs(void)
|
int btrfs_init_sysfs(void)
|
||||||
{
|
{
|
||||||
int ret;
|
int ret;
|
||||||
|
|
||||||
btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
|
btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
|
||||||
if (!btrfs_kset)
|
if (!btrfs_kset)
|
||||||
return -ENOMEM;
|
return -ENOMEM;
|
||||||
|
|
||||||
init_feature_attrs();
|
ret = btrfs_init_debugfs();
|
||||||
|
if (ret)
|
||||||
ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
|
||||||
if (ret) {
|
|
||||||
kset_unregister(btrfs_kset);
|
|
||||||
return ret;
|
return ret;
|
||||||
}
|
|
||||||
|
|
||||||
return 0;
|
init_feature_attrs();
|
||||||
|
ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
||||||
|
|
||||||
|
return ret;
|
||||||
}
|
}
|
||||||
|
|
||||||
void btrfs_exit_sysfs(void)
|
void btrfs_exit_sysfs(void)
|
||||||
{
|
{
|
||||||
sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
||||||
kset_unregister(btrfs_kset);
|
kset_unregister(btrfs_kset);
|
||||||
|
debugfs_remove_recursive(btrfs_debugfs_root_dentry);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -1,6 +1,11 @@
|
|||||||
#ifndef _BTRFS_SYSFS_H_
|
#ifndef _BTRFS_SYSFS_H_
|
||||||
#define _BTRFS_SYSFS_H_
|
#define _BTRFS_SYSFS_H_
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Data exported through sysfs
|
||||||
|
*/
|
||||||
|
extern u64 btrfs_debugfs_test;
|
||||||
|
|
||||||
enum btrfs_feature_set {
|
enum btrfs_feature_set {
|
||||||
FEAT_COMPAT,
|
FEAT_COMPAT,
|
||||||
FEAT_COMPAT_RO,
|
FEAT_COMPAT_RO,
|
||||||
|
Loading…
Reference in New Issue
Block a user