Re: [PATCH v2 00/18 stable-5.15.y] Fix mmap + page fault deadlocks

[Anand Jain <anand.jain@oracle.com>]

The patch order is incorrect, I am fixing this in v3. Sorry for the 
noise. Pls , ignore this.

Thx, Anand

On 12/04/2022 13:14, Anand Jain wrote:
> v2:
> Rebase on the latest stable-5.15.33.
> Adds the following commits to the v1 patchset as they fix issues in the
> merged commit.
> 
>    ca93e44bfb5f btrfs: fallback to blocking mode when doing async dio over multiple extents
>    fe673d3f5bf1 mm: gup: make fault_in_safe_writeable() use fixup_user_fault()
> 
> And this set drops the following patch as it is already in the
> stable-5.15.y.
> 
>    [PATCH 01/17 stable-5.15.y] powerpc/kvm: Fix kvm_use_magic_page
> 
> ------- original cover letter --------
> This set fixes a process hang issue in btrfs and gf2 filesystems. When we
> do a direct IO read or write when the buffer given by the user is
> memory-mapped to the file range we are going to do IO, we end up ending
> in a deadlock. This is triggered by the test case generic/647 from
> fstests.
> 
> This fix depends on the iov_iter and iomap changes introduced in the
> commit c03098d4b9ad ("Merge tag 'gfs2-v5.15-rc5-mmap-fault' of
> git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2") and they
> are part of this set for stable-5.15.y.
> 
> Please note that patch 2/18 (in v2) (was 3/17 in v1) in the patchset
> changes the prototype and renames an exported symbol as below. All its
> references are updated as well.
> 
> -EXPORT_SYMBOL(iov_iter_fault_in_readable);
> +EXPORT_SYMBOL(fault_in_iov_iter_readable);
> 
> Andreas Gruenbacher (14):
>    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
> 
> Filipe Manana (2):
>    btrfs: fix deadlock due to page faults during direct IO reads and
>      writes
>    btrfs: fallback to blocking mode when doing async dio over multiple
>      extents
> 
> Linus Torvalds (1):
>    mm: gup: make fault_in_safe_writeable() use fixup_user_fault()
> 
>   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                     | 142 ++++++++++--
>   fs/btrfs/inode.c                    |  28 +++
>   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                      |  98 +++++++--
>   mm/filemap.c                        |   4 +-
>   mm/gup.c                            | 120 +++++++++-
>   30 files changed, 920 insertions(+), 298 deletions(-)
>