btrfsck --readonly exited with status code 0
[1/8] checking log skipped (none written)
[2/8] checking root items
[3/8] checking extents
[4/8] checking free space tree
[5/8] checking fs roots
[6/8] checking only csums items (without verifying data)
[7/8] checking root refs
[8/8] checking quota groups skipped (not enabled on this FS)
Opening filesystem to check...
Checking filesystem on /tmp/1211305790.img
UUID: c6b85f58-0c7e-41ca-a553-c8d9f94f6663
found 57344 bytes used, no error found
total csum bytes: 96
total tree bytes: 45056
total fs tree bytes: 16384
total extent tree bytes: 4096
btree space waste bytes: 33999
file data blocks allocated: 12288
 referenced 12288