[PATCH v0 2/4] Add hook for sysfs to btrfs.

@@ -36,6 +36,7 @@
 #include "async-thread.h"
 #include "check-integrity.h"
 #include "rcu-string.h"
+#include "sysfs.h"
 
 static int init_first_rw_device(struct btrfs_trans_handle *trans,
 				struct btrfs_root *root,

@@ -405,6 +406,8 @@ static noinline int device_list_add(const char *path,
 		}
 	}
 
+	btrfs_sysfs_add_device(device);
+
 	if (found_transid > fs_devices->latest_trans) {
 		fs_devices->latest_devid = devid;
 		fs_devices->latest_trans = found_transid;

@@ -458,6 +461,9 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
 		INIT_LIST_HEAD(&device->dev_alloc_list);
 
 		list_add(&device->dev_list, &fs_devices->devices);
+		
+		btrfs_sysfs_add_device(device);
+		
 		device->fs_devices = fs_devices;
 		fs_devices->num_devices++;
 	}

@@ -576,7 +582,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
 		new_device->in_fs_metadata = 0;
 		new_device->can_discard = 0;
 		list_replace_rcu(&device->dev_list, &new_device->dev_list);
-
+		//btrfs_sysfs_remove_device(device);
 		call_rcu(&device->rcu, free_device);
 	}
 	mutex_unlock(&fs_devices->device_list_mutex);

@@ -1430,6 +1436,9 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
 
 	cur_devices = device->fs_devices;
 	mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
+	
+	btrfs_sysfs_remove_device(device);
+	
 	list_del_rcu(&device->dev_list);
 
 	device->fs_devices->num_devices--;

@@ -1744,6 +1753,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
 	 */
 	mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
 	list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices);
+	btrfs_sysfs_add_device(device);
 	list_add(&device->dev_alloc_list,
 		 &root->fs_info->fs_devices->alloc_list);
 	root->fs_info->fs_devices->num_devices++;

@@ -4306,6 +4316,9 @@ static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
 	spin_lock_init(&device->io_lock);
 	INIT_LIST_HEAD(&device->dev_alloc_list);
 	memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE);
+	
+	btrfs_sysfs_add_device(device);
+	
 	return device;
 }