[PATCH v2 0/6] gfs2: Fix mmap + page fault deadlocks

[Andreas Gruenbacher]

Hi Linus et al.,

here's an update to the gfs2 mmap + page faults fix that implements
Linus's suggestion of disabling page faults while we're holding the
inode glock.

This passes fstests except for test generic/095, which fails due to an
independent bug in the iov_iter code.  I'm currently trying to get
initial feedback from Al and Christoph on that.

Any feedback would be welcome.

Thanks a lot,
Andreas

Andreas Gruenbacher (6):
  iov_iter: Introduce fault_in_iov_iter helper
  iomap: Fix iomap_dio_rw return value for page faults
  gfs2: Add wrapper for iomap_file_buffered_write
  gfs2: Fix mmap + page fault deadlocks for buffered I/O
  iov_iter: Introduce ITER_FLAG_FAST_ONLY flag
  gfs2: Fix mmap + page fault deadlocks for direct I/O

 fs/gfs2/file.c       | 79 ++++++++++++++++++++++++++++++++++++++++----
 fs/iomap/direct-io.c |  2 ++
 include/linux/mm.h   |  3 ++
 include/linux/uio.h  | 16 +++++++--
 lib/iov_iter.c       | 62 +++++++++++++++++++++++++++++++---
 mm/gup.c             | 68 ++++++++++++++++++++++++++++++++++++++
 6 files changed, 215 insertions(+), 15 deletions(-)

-- 
2.26.3