[v9,00/17] gfs2: Fix mmap + page fault deadlocks

Here's another update of this patch queue on top of v5.15-rc5.  Changes:

 * Fix a bug in the do_promote changes of "gfs2: Clean up function
   may_grant" (find_first_holder needs to be called inside the restart
   loop).

 * Add a comment explaining __iomap_dio_rw's new done_before argument
   per request of Darrick J. Wong.

 * Use untagged_addr() in fault_in_safe_writeable as per comment from
   Catalin Marinas.


I've pushed is patch set here:

  https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/log/?h=for-next.mmap-fault
  b01b2d72da25c000aeb124bc78daf3fb998be2b6


These changes are from October 25, so they've had some exposure in
for-next.  As Stephen Rothwell points out, there's a minor merge
conflict between commit:

  bb523b406c84 ("gup: Turn fault_in_pages_{readable,writeable} into fault_in_{readable,writeable}")

from this patch set and the following two commits in mainline:

  fcfb7163329c ("x86/fpu/signal: Move xstate clearing out of copy_fpregs_to_sigframe()")
  a2a8fd9a3efd ("x86/fpu/signal: Change return code of restore_fpregs_from_user() to boolean")


Thanks,
Andreas

Andreas Gruenbacher (16):
  iov_iter: Fix iov_iter_get_pages{,_alloc} page fault return value
  powerpc/kvm: Fix kvm_use_magic_page
  gup: Turn fault_in_pages_{readable,writeable} into
    fault_in_{readable,writeable}
  iov_iter: Turn iov_iter_fault_in_readable into
    fault_in_iov_iter_readable
  iov_iter: Introduce fault_in_iov_iter_writeable
  gfs2: Add wrapper for iomap_file_buffered_write
  gfs2: Clean up function may_grant
  gfs2: Move the inode glock locking to gfs2_file_buffered_write
  gfs2: Eliminate ip->i_gh
  gfs2: Fix mmap + page fault deadlocks for buffered I/O
  iomap: Fix iomap_dio_rw return value for user copies
  iomap: Support partial direct I/O on user copy failures
  iomap: Add done_before argument to iomap_dio_rw
  gup: Introduce FOLL_NOFAULT flag to disable page faults
  iov_iter: Introduce nofault flag to disable page faults
  gfs2: Fix mmap + page fault deadlocks for direct I/O

Bob Peterson (1):
  gfs2: Introduce flag for glock holder auto-demotion

 arch/powerpc/kernel/kvm.c           |   3 +-
 arch/powerpc/kernel/signal_32.c     |   4 +-
 arch/powerpc/kernel/signal_64.c     |   2 +-
 arch/x86/kernel/fpu/signal.c        |   7 +-
 drivers/gpu/drm/armada/armada_gem.c |   7 +-
 fs/btrfs/file.c                     |   7 +-
 fs/btrfs/ioctl.c                    |   5 +-
 fs/erofs/data.c                     |   2 +-
 fs/ext4/file.c                      |   5 +-
 fs/f2fs/file.c                      |   2 +-
 fs/fuse/file.c                      |   2 +-
 fs/gfs2/bmap.c                      |  60 +----
 fs/gfs2/file.c                      | 252 +++++++++++++++++++--
 fs/gfs2/glock.c                     | 330 +++++++++++++++++++++-------
 fs/gfs2/glock.h                     |  20 ++
 fs/gfs2/incore.h                    |   4 +-
 fs/iomap/buffered-io.c              |   2 +-
 fs/iomap/direct-io.c                |  29 ++-
 fs/ntfs/file.c                      |   2 +-
 fs/ntfs3/file.c                     |   2 +-
 fs/xfs/xfs_file.c                   |   6 +-
 fs/zonefs/super.c                   |   4 +-
 include/linux/iomap.h               |  11 +-
 include/linux/mm.h                  |   3 +-
 include/linux/pagemap.h             |  58 +----
 include/linux/uio.h                 |   4 +-
 lib/iov_iter.c                      | 103 +++++++--
 mm/filemap.c                        |   4 +-
 mm/gup.c                            | 139 +++++++++++-
 29 files changed, 793 insertions(+), 286 deletions(-)