[PATCH v2 0/7] add sanity check for extent inline ref type

An invalid extent inline ref type could be read from a btrfs image and
it ends up with a panic[1], this set is to deal with the insane value
gracefully in patch 1-2 and clean up BUG() in the code in patch 3-6.

Patch 7 adds one more check to see if the ref is a valid shared one.

I'm not sure in the real world what may result in this corruption, but
I've seen several reports on the ML about __btrfs_free_extent saying
something was missing (or simply wrong), while testing this set with
btrfs-corrupt-block, I found that switching ref type could end up that
situation as well, eg. a data extent's ref type
(BTRFS_EXTENT_DATA_REF_KEY) is switched to (BTRFS_TREE_BLOCK_REF_KEY).
Hopefully this can give people more sights next time when that
happens.

[1]:https://www.spinics.net/lists/linux-btrfs/msg65646.html

v2:
- add enum type and return BTRFS_REF_TYPE_INVALID instead of -EINVAL.
- remove one more BUG_ON which is in __add_tree_block.
- add validation check for shared refs.
- improve btrfs_print_leaf to show which refs has something wrong.

Liu Bo (7):
  Btrfs: add a helper to retrive extent inline ref type
  Btrfs: convert to use btrfs_get_extent_inline_ref_type
  Btrfs: remove BUG() in btrfs_extent_inline_ref_size
  Btrfs: remove BUG() in print_extent_item
  Btrfs: remove BUG() in add_data_reference
  Btrfs: remove BUG_ON in __add_tree_block
  Btrfs: add one more sanity check for shared ref type

 fs/btrfs/backref.c     | 11 ++++--
 fs/btrfs/ctree.h       | 12 ++++++-
 fs/btrfs/extent-tree.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++----
 fs/btrfs/print-tree.c  | 28 ++++++++++++---
 fs/btrfs/relocation.c  | 29 +++++++++++++---
 5 files changed, 155 insertions(+), 18 deletions(-)

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2.9.4