[PATCH 0/6] add sanity check for extent inline ref type

[Liu Bo <bo.li.liu@oracle.com>]

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 3-5.

Patch 6 adds scrub support to detect the corruption, so users can be
noticed when they do scrub on a regular basis.

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

Liu Bo (6):
  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: add sanity check of extent item in scrub

 fs/btrfs/backref.c     |  9 +++++--
 fs/btrfs/ctree.h       |  5 +++-
 fs/btrfs/extent-tree.c | 68 ++++++++++++++++++++++++++++++++++++++++++++------
 fs/btrfs/print-tree.c  |  8 +++++-
 fs/btrfs/relocation.c  | 20 ++++++++++++---
 fs/btrfs/scrub.c       | 43 +++++++++++++++++++++++++++++++
 6 files changed, 139 insertions(+), 14 deletions(-)

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2.9.4