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Commit 43530c46 authored by Miao Xie's avatar Miao Xie Committed by Chris Mason
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Btrfs: fix unprotected device->bytes_used update 



We should update device->bytes_used in the lock context of
chunk_mutex, or we would get wrong data.

Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 5d778aae

fs/btrfs/volumes.c

+3 −1
Original line number Diff line number Diff line
@@ -4429,6 +4429,9 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 
	if (ret)

		goto error_del_extent;



	for (i = 0; i < map->num_stripes; i++)

		map->stripes[i].dev->bytes_used += stripe_size;



	free_extent_map(em);

	check_raid56_incompat_flag(extent_root->fs_info, type);
@@ -4500,7 +4503,6 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, 
		device = map->stripes[i].dev;

		dev_offset = map->stripes[i].physical;



		device->bytes_used += stripe_size;

		ret = btrfs_update_device(trans, device);

		if (ret)

			goto out;