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    Subject[PATCH 0/9 v2] scope GFP_NOFS api
    Date
    Hi,
    I have posted the previous version here [1]. Since then I have added a
    support to suppress reclaim lockdep warnings (__GFP_NOLOCKDEP) to allow
    removing GFP_NOFS usage motivated by the lockdep false positives. On top
    of that I've tried to convert few KM_NOFS usages to use the new flag in
    the xfs code base. This would need a review from somebody familiar with
    xfs of course.

    Then I've added the new scope API to the jbd/ext transaction code +
    reverted some explicit GFP_NOFS usages which are covered by the scope one
    now. This also needs a deep review from ext developers. I have some more
    patches which remove more explicit GFP_NOFS users but that is not really
    ready yet. I would really appreciate if developers for other filesystems
    joined me here as well. Maybe ext parts can help to show how to start.
    Especially btrfs which uses GFP_NOFS a lot (and not with a good reason
    in many cases I suspect).

    The patchset is based on linux-next (next-20161214).

    I think the GFP_NOIO should be seeing the same clean up but that is not
    a part of this patchset.

    Any feedback is highly appreciated of course.

    Diffstat says
    fs/ext4/acl.c | 6 +++---
    fs/ext4/extents.c | 8 ++++----
    fs/ext4/resize.c | 4 ++--
    fs/ext4/xattr.c | 4 ++--
    fs/jbd2/journal.c | 7 +++++++
    fs/jbd2/transaction.c | 11 +++++++++++
    fs/xfs/kmem.c | 10 +++++-----
    fs/xfs/kmem.h | 6 +++++-
    fs/xfs/libxfs/xfs_btree.c | 2 +-
    fs/xfs/libxfs/xfs_da_btree.c | 4 ++--
    fs/xfs/xfs_aops.c | 6 +++---
    fs/xfs/xfs_buf.c | 10 +++++-----
    fs/xfs/xfs_dir2_readdir.c | 2 +-
    fs/xfs/xfs_trans.c | 12 ++++++------
    include/linux/gfp.h | 18 +++++++++++++++++-
    include/linux/jbd2.h | 2 ++
    include/linux/sched.h | 32 ++++++++++++++++++++++++++------
    kernel/locking/lockdep.c | 6 +++++-
    lib/radix-tree.c | 2 ++
    mm/page_alloc.c | 8 +++++---
    mm/vmscan.c | 6 +++---
    21 files changed, 117 insertions(+), 49 deletions(-)

    Shortlog:
    Michal Hocko (9):
    lockdep: allow to disable reclaim lockup detection
    xfs: introduce and use KM_NOLOCKDEP to silence reclaim lockdep false positives
    xfs: abstract PF_FSTRANS to PF_MEMALLOC_NOFS
    mm: introduce memalloc_nofs_{save,restore} API
    xfs: use memalloc_nofs_{save,restore} instead of memalloc_noio*
    jbd2: mark the transaction context with the scope GFP_NOFS context
    jbd2: make the whole kjournald2 kthread NOFS safe
    Revert "ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp"
    Revert "ext4: fix wrong gfp type under transaction"


    [1] http://lkml.kernel.org/r/1461671772-1269-1-git-send-email-mhocko@kernel.org


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