[PATCH 0/2] btrfs-progs: only allow certain commands to ignore transid errors

[Qu Wenruo <wqu@suse.com>]

There is a bug in reddit (well, really the last place I expect to see
bug reports), that btrfstune -u fails due to transid error, but it also
leaves CHANGING_FSID flag to the super block, prevent btrfs-check to
properly check the fs.

The problem is, all commands in btrfs-progs can ignore transid error,
but there are only very limited usage of such ability.

Btrfstune definitely should not utilize this feature.

This patchset will introduce a new open ctree flag to explicitly
indicate we want to ignore transid errors.

Currently only there are only 3 tools using this feature:

- btrfs-check
  It may fix transid error (at least for the specific test case)

- btrfs-restore
  It wants to ignore all errors.

- btrfs-image
  To make fsck/002 happy.

Also add a test case for btrfstune, to make sure btrfstune can rejects
the fs when an obvious transid mismatch is detected during open_ctree().

Qu Wenruo (2):
  btrfs-progs: introduce OPEN_CTREE_ALLOW_TRANSID_MISMATCH flag
  btrfs-progs: misc-tests: add new test case to make sure btrfstune
    rejects corrupted fs

 check/main.c                                     |  3 ++-
 cmds/restore.c                                   |  3 ++-
 image/main.c                                     | 11 +++++++----
 kernel-shared/ctree.h                            |  1 +
 kernel-shared/disk-io.c                          | 11 +++++++++--
 kernel-shared/disk-io.h                          |  6 ++++++
 .../default_case.img                             |  1 +
 .../049-btrfstune-transid-mismatch/test.sh       | 16 ++++++++++++++++
 8 files changed, 44 insertions(+), 8 deletions(-)
 create mode 120000 tests/misc-tests/049-btrfstune-transid-mismatch/default_case.img
 create mode 100755 tests/misc-tests/049-btrfstune-transid-mismatch/test.sh

-- 
2.33.0