[PATCH 0/2] btrfs: fix a regression with concurrent DIO writes and fsync on the same fd

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

Fix a recent regression when doing concurrent direct IO writes and fsync
using the same fd from multiple threads. This was reported recently by a
couple users when using QEMU, as well as syzbot. The fix is the first
patch in the series, the second one is just an improvement for some
assertions. Details in the change logs of each patch.

Filipe Manana (2):
  btrfs: fix race between direct IO write and fsync when using same fd
  btrfs: add and use helper to verify the calling task has locked the inode

 fs/btrfs/btrfs_inode.h  |  8 ++++++++
 fs/btrfs/ctree.h        |  1 -
 fs/btrfs/direct-io.c    | 16 +++-------------
 fs/btrfs/file.c         |  9 +++++++--
 fs/btrfs/ordered-data.c |  2 +-
 fs/btrfs/transaction.h  |  6 ++++++
 fs/btrfs/tree-log.c     |  2 +-
 fs/btrfs/verity.c       |  6 +++---
 fs/btrfs/xattr.c        |  2 +-
 9 files changed, 30 insertions(+), 22 deletions(-)

-- 
2.43.0