[GIT PULL] Btrfs update, part 2

[David Sterba]

Hi,

here's a separate fix that depends on changes that landed last week (the
iomap + iov_iter merged as c03098d4b9ad).

The fix itself is for a deadlock when direct/buffered IO is done on a
mmaped file and a fault happens (details in the patch). There's a fstest
generic/647 that triggers the problem and makes testing hard.

No merge conflicts. Please pull, thanks.

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The following changes since commit c03098d4b9ad76bca2966a8769dcfe59f7f85103:

  Merge tag 'gfs2-v5.15-rc5-mmap-fault' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2 (2021-11-02 12:25:03 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-5.16-deadlock-fix-tag

for you to fetch changes up to 51bd9563b6783de8315f38f7baed949e77c42311:

  btrfs: fix deadlock due to page faults during direct IO reads and writes (2021-11-09 13:46:07 +0100)

----------------------------------------------------------------
Filipe Manana (1):
      btrfs: fix deadlock due to page faults during direct IO reads and writes

 fs/btrfs/file.c | 139 +++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 123 insertions(+), 16 deletions(-)