[PATCH 0/4] btrfs/220: make it compatible with older kernels

[Anand Jain <anand.jain@oracle.com>]

I found this test case fails on older kernels such as 5.4.17 as the
patches that brought the mount options changes aren't the candidate
for the backport because of ABI compliance.

So make this test case to check if the newer options such as [1]
are supported and tests the mount options along with the expected
output in /proc/self/mounts accordingly.

[1]
 mount options changes:
  new                   old
  discard=sync          discard
  rescue=nologreplay    nologreplay

 /proc/self/mounts output changes:
  new  old
  ""   clear_cache

Patch 1 improves the debug log provided by the _fail() for the
scratch_mount.

Patch 2,3,4 fixes discard, nologreplay and clear_cache, respectively
and,  they are separated into the individual patch to show the diff.
These may merge at the time of integration. I am ok.

This patchset is on top of Boris's patch [2]
[2]
 [PATCH] btrfs/220: fix clear_cache and inode_cache option tests
 https://patchwork.kernel.org/project/fstests/patch/409e4c73fefce666d151b043d6b2a0d821f8ef85.1610485406.git.boris@bur.io/

Anand Jain (4):
  rc: debug add _scratch_mount_options to the _scratch_mount
  btrfs/220: discard=sync support older kernel
  btrfs/220: nologreplay support older kernel
  btrfs/220: clear_cache fix for older kernel

 common/rc       |  2 +-
 tests/btrfs/220 | 59 +++++++++++++++++++++++++++++++++++++++----------
 2 files changed, 48 insertions(+), 13 deletions(-)

-- 
2.27.0