Re: [PATCH 00/12] block/bio, fs: convert put_page() to put_user_page*()

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On 7/24/19 12:25 PM, john.hubbard@xxxxxxxxx wrote:
> From: John Hubbard <jhubbard@xxxxxxxxxx>
> 
> Hi,
> 
> This is mostly Jerome's work, converting the block/bio and related areas
> to call put_user_page*() instead of put_page(). Because I've changed
> Jerome's patches, in some cases significantly, I'd like to get his
> feedback before we actually leave him listed as the author (he might
> want to disown some or all of these).
> 

Could you add some background to the commit log for people don't have the context..
Why this converting? What's the main differences?

Regards, -Bob

> I added a new patch, in order to make this work with Christoph Hellwig's
> recent overhaul to bio_release_pages(): "block: bio_release_pages: use
> flags arg instead of bool".
> 
> I've started the series with a patch that I've posted in another
> series ("mm/gup: add make_dirty arg to put_user_pages_dirty_lock()"[1]),
> because I'm not sure which of these will go in first, and this allows each
> to stand alone.
> 
> Testing: not much beyond build and boot testing has been done yet. And
> I'm not set up to even exercise all of it (especially the IB parts) at
> run time.
> 
> Anyway, changes here are:
> 
> * Store, in the iov_iter, a "came from gup (get_user_pages)" parameter.
>   Then, use the new iov_iter_get_pages_use_gup() to retrieve it when
>   it is time to release the pages. That allows choosing between put_page()
>   and put_user_page*().
> 
> * Pass in one more piece of information to bio_release_pages: a "from_gup"
>   parameter. Similar use as above.
> 
> * Change the block layer, and several file systems, to use
>   put_user_page*().
> 
> [1] https://urldefense.proofpoint.com/v2/url?u=https-3A__lore.kernel.org_r_20190724012606.25844-2D2-2Djhubbard-40nvidia.com&d=DwIDaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=1ktT0U2YS_I8Zz2o-MS1YcCAzWZ6hFGtyTgvVMGM7gI&m=FpFhv2rjbKCAYGmO6Hy8WJAottr1Qz_mDKDLObQ40FU&s=q-_mX3daEr22WbdZMElc_ZbD8L9oGLD7U0xLeyJ661Y&e= 
>     And please note the correction email that I posted as a follow-up,
>     if you're looking closely at that patch. :) The fixed version is
>     included here.
> 
> John Hubbard (3):
>   mm/gup: add make_dirty arg to put_user_pages_dirty_lock()
>   block: bio_release_pages: use flags arg instead of bool
>   fs/ceph: fix a build warning: returning a value from void function
> 
> Jérôme Glisse (9):
>   iov_iter: add helper to test if an iter would use GUP v2
>   block: bio_release_pages: convert put_page() to put_user_page*()
>   block_dev: convert put_page() to put_user_page*()
>   fs/nfs: convert put_page() to put_user_page*()
>   vhost-scsi: convert put_page() to put_user_page*()
>   fs/cifs: convert put_page() to put_user_page*()
>   fs/fuse: convert put_page() to put_user_page*()
>   fs/ceph: convert put_page() to put_user_page*()
>   9p/net: convert put_page() to put_user_page*()
> 
>  block/bio.c                                |  81 ++++++++++++---
>  drivers/infiniband/core/umem.c             |   5 +-
>  drivers/infiniband/hw/hfi1/user_pages.c    |   5 +-
>  drivers/infiniband/hw/qib/qib_user_pages.c |   5 +-
>  drivers/infiniband/hw/usnic/usnic_uiom.c   |   5 +-
>  drivers/infiniband/sw/siw/siw_mem.c        |   8 +-
>  drivers/vhost/scsi.c                       |  13 ++-
>  fs/block_dev.c                             |  22 +++-
>  fs/ceph/debugfs.c                          |   2 +-
>  fs/ceph/file.c                             |  62 ++++++++---
>  fs/cifs/cifsglob.h                         |   3 +
>  fs/cifs/file.c                             |  22 +++-
>  fs/cifs/misc.c                             |  19 +++-
>  fs/direct-io.c                             |   2 +-
>  fs/fuse/dev.c                              |  22 +++-
>  fs/fuse/file.c                             |  53 +++++++---
>  fs/nfs/direct.c                            |  10 +-
>  include/linux/bio.h                        |  22 +++-
>  include/linux/mm.h                         |   5 +-
>  include/linux/uio.h                        |  11 ++
>  mm/gup.c                                   | 115 +++++++++------------
>  net/9p/trans_common.c                      |  14 ++-
>  net/9p/trans_common.h                      |   3 +-
>  net/9p/trans_virtio.c                      |  18 +++-
>  24 files changed, 357 insertions(+), 170 deletions(-)
> 




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