[GIT PULL] Btrfs corruption fix

[Chris Mason]

Hi Linus,

I'm testing a pull with more fixes, but wanted to get this one out so
Greg can pick it up.  The corruption isn't easy to hit, you have to do a
readonly snapshot and have orphans in the snapshot.  But my review and
testing missed the bug.  Filipe has added a better xfstest to cover it.

Please pull:

git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git for-linus

Chris Mason (1) commits (+33/-36):
    Revert "Btrfs: race free update of commit root for ro snapshots"

Total: (1) commits (+33/-36)

 fs/btrfs/inode.c | 36 ------------------------------------
 fs/btrfs/ioctl.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 36 deletions(-)
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