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btrfs: publish device membership in sysfs 

Now that we have the infrastructure for per-super attributes, we can
publish device membership in /sys/fs/btrfs/<fsid>/devices. The information
is published as symlinks to the block devices.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Jeff Mahoney 2013-11-01 13:07:05 -04:00 committed by Chris Mason
parent 6ab0a2029c
commit 29e5be240a
2 changed files with 33 additions and 0 deletions
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1
fs/btrfs/ctree.h
View File

@ -1530,6 +1530,7 @@ struct btrfs_fs_info {
struct kobject super_kobj;
struct kobject *space_info_kobj;
struct kobject *device_dir_kobj;
struct completion kobj_unregister;
int do_barriers;
int closing;

32
fs/btrfs/sysfs.c
View File

@ -23,11 +23,13 @@
#include <linux/buffer_head.h>
#include <linux/kobject.h>
#include <linux/bug.h>
#include <linux/genhd.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "sysfs.h"
#include "volumes.h"
static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
@ -374,6 +376,8 @@ static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
{
sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
kobject_del(fs_info->device_dir_kobj);
kobject_put(fs_info->device_dir_kobj);
kobject_del(fs_info->space_info_kobj);
kobject_put(fs_info->space_info_kobj);
kobject_del(&fs_info->super_kobj);
@ -507,6 +511,30 @@ static int add_unknown_feature_attrs(struct btrfs_fs_info *fs_info)
return 0;
}
static int add_device_membership(struct btrfs_fs_info *fs_info)
{
int error = 0;
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
struct btrfs_device *dev;
fs_info->device_dir_kobj = kobject_create_and_add("devices",
&fs_info->super_kobj);
if (!fs_info->device_dir_kobj)
return -ENOMEM;
list_for_each_entry(dev, &fs_devices->devices, dev_list) {
struct hd_struct *disk = dev->bdev->bd_part;
struct kobject *disk_kobj = &part_to_dev(disk)->kobj;
error = sysfs_create_link(fs_info->device_dir_kobj,
disk_kobj, disk_kobj->name);
if (error)
break;
}
return error;
}
/* /sys/fs/btrfs/ entry */
static struct kset *btrfs_kset;
@ -528,6 +556,10 @@ int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
if (error)
goto failure;
error = add_device_membership(fs_info);
if (error)
goto failure;
fs_info->space_info_kobj = kobject_create_and_add("allocation",
&fs_info->super_kobj);
if (!fs_info->space_info_kobj) {