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Commit f190aa47 authored by Anand Jain's avatar Anand Jain Committed by David Sterba
Browse files

Btrfs: add helper for closing one device 



Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
[reworded subject and changelog]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 097efc96

fs/btrfs/volumes.c

+36 −30
Original line number Diff line number Diff line
@@ -764,36 +764,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) 


	mutex_lock(&fs_devices->device_list_mutex);

	list_for_each_entry_safe(device, tmp, &fs_devices->devices, dev_list) {

		struct btrfs_device *new_device;

		struct rcu_string *name;



		if (device->bdev)

			fs_devices->open_devices--;



		if (device->writeable &&

		    device->devid != BTRFS_DEV_REPLACE_DEVID) {

			list_del_init(&device->dev_alloc_list);

			fs_devices->rw_devices--;

		}



		if (device->missing)

			fs_devices->missing_devices--;



		new_device = btrfs_alloc_device(NULL, &device->devid,

						device->uuid);

		BUG_ON(IS_ERR(new_device)); /* -ENOMEM */



		/* Safe because we are under uuid_mutex */

		if (device->name) {

			name = rcu_string_strdup(device->name->str, GFP_NOFS);

			BUG_ON(!name); /* -ENOMEM */

			rcu_assign_pointer(new_device->name, name);

		}



		list_replace_rcu(&device->dev_list, &new_device->dev_list);

		new_device->fs_devices = device->fs_devices;



		call_rcu(&device->rcu, free_device);

		btrfs_close_one_device(device);

	}

	mutex_unlock(&fs_devices->device_list_mutex);
@@ -6834,3 +6805,38 @@ void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info) 
		fs_devices = fs_devices->seed;

	}

}



void btrfs_close_one_device(struct btrfs_device *device)

{

	struct btrfs_fs_devices *fs_devices = device->fs_devices;

	struct btrfs_device *new_device;

	struct rcu_string *name;



	if (device->bdev)

		fs_devices->open_devices--;



	if (device->writeable &&

	    device->devid != BTRFS_DEV_REPLACE_DEVID) {

		list_del_init(&device->dev_alloc_list);

		fs_devices->rw_devices--;

	}



	if (device->missing)

		fs_devices->missing_devices--;



	new_device = btrfs_alloc_device(NULL, &device->devid,

					device->uuid);

	BUG_ON(IS_ERR(new_device)); /* -ENOMEM */



	/* Safe because we are under uuid_mutex */

	if (device->name) {

		name = rcu_string_strdup(device->name->str, GFP_NOFS);

		BUG_ON(!name); /* -ENOMEM */

		rcu_assign_pointer(new_device->name, name);

	}



	list_replace_rcu(&device->dev_list, &new_device->dev_list);

	new_device->fs_devices = device->fs_devices;



	call_rcu(&device->rcu, free_device);

}

fs/btrfs/volumes.h

+1 −0
Original line number Diff line number Diff line
@@ -547,5 +547,6 @@ static inline void unlock_chunks(struct btrfs_root *root) 
struct list_head *btrfs_get_fs_uuids(void);

void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);

void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);

void btrfs_close_one_device(struct btrfs_device *device);



#endif