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

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Message-Id: <20210718223932.2703330-1-agruenba@redhat.com>
Date:   Mon, 19 Jul 2021 00:39:26 +0200
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        cluster-devel@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com,
        Andreas Gruenbacher <agruenba@...hat.com>
Subject: [PATCH v2 0/6] gfs2: Fix mmap + page fault deadlocks

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