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btrfs: Transpose btrfs_close_devices/btrfs_mapping_tree_free in close_ctree
Following the introduction of the alloc_state tree, some of the callees of btrfs_mapping_tree_free will have to interact with the btrfs_device of the constituent devices. Enable this by moving the code responsible for freeing devices after the last user (btrfs_mapping_tree_free). Otherwise the kernel could crash due to use-after-free. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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@ -4040,8 +4040,8 @@ void close_ctree(struct btrfs_fs_info *fs_info)
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btrfsic_unmount(fs_info->fs_devices);
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#endif
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btrfs_close_devices(fs_info->fs_devices);
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btrfs_mapping_tree_free(&fs_info->mapping_tree);
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btrfs_close_devices(fs_info->fs_devices);
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percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
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percpu_counter_destroy(&fs_info->delalloc_bytes);
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