Commit 68c94e55 authored by Nikolay Borisov's avatar Nikolay Borisov Committed by David Sterba
Browse files

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: default avatarNikolay Borisov <nborisov@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 8e75fd89

fs/btrfs/disk-io.c

+1 −1
Original line number Diff line number Diff line
@@ -4040,8 +4040,8 @@ void close_ctree(struct btrfs_fs_info *fs_info) 
		btrfsic_unmount(fs_info->fs_devices);

#endif



	btrfs_close_devices(fs_info->fs_devices);

	btrfs_mapping_tree_free(&fs_info->mapping_tree);

	btrfs_close_devices(fs_info->fs_devices);



	percpu_counter_destroy(&fs_info->dirty_metadata_bytes);

	percpu_counter_destroy(&fs_info->delalloc_bytes);