Em Wed, 15 Apr 2020 08:41:44 -0700
"Darrick J. Wong" <darrick.wong@xxxxxxxxxx> escreveu:
> [add ira weiny to cc]
>
> On Wed, Apr 15, 2020 at 04:32:25PM +0200, Mauro Carvalho Chehab wrote:
> > - Add a SPDX header;
> > - Adjust document title;
> > - Some whitespace fixes and new line breaks;
> > - Add it to filesystems/index.rst.
> >
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
> > ---
> > Documentation/admin-guide/ext4.rst | 2 +-
> > Documentation/filesystems/{dax.txt => dax.rst} | 9 +++++++--
> > Documentation/filesystems/ext2.rst | 2 +-
> > Documentation/filesystems/index.rst | 1 +
> > 4 files changed, 10 insertions(+), 4 deletions(-)
> > rename Documentation/filesystems/{dax.txt => dax.rst} (97%)
> >
> > diff --git a/Documentation/admin-guide/ext4.rst b/Documentation/admin-guide/ext4.rst
> > index 9443fcef1876..103bcc345bad 100644
> > --- a/Documentation/admin-guide/ext4.rst
> > +++ b/Documentation/admin-guide/ext4.rst
> > @@ -392,7 +392,7 @@ When mounting an ext4 filesystem, the following option are accepted:
> >
> > dax
> > Use direct access (no page cache). See
> > - Documentation/filesystems/dax.txt. Note that this option is
> > + Documentation/filesystems/dax.rst. Note that this option is
> > incompatible with data=journal.
> >
> > Data Mode
> > diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.rst
> > similarity index 97%
> > rename from Documentation/filesystems/dax.txt
> > rename to Documentation/filesystems/dax.rst
> > index 735f3859b19f..5838144f80f0 100644
> > --- a/Documentation/filesystems/dax.txt
> > +++ b/Documentation/filesystems/dax.rst
>
> Err, this will collide with the work that Ira's doing on DAX for 5.8[1].
> Can the dax.txt conversion wait?
Well, I can re-schedule it to 5.9. Or, if you merge the dax changes
at linux-next, I can rebase my patch on the top of it.
>
> --D
>
> [1] https://lore.kernel.org/linux-xfs/20200415152942.GS6742@magnolia/T/#m804562299416d865d8829caa82589a522b2080a5
>
> > @@ -1,5 +1,8 @@
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +=======================
> > Direct Access for files
> > ------------------------
> > +=======================
> >
> > Motivation
> > ----------
> > @@ -46,6 +49,7 @@ stall the CPU for an extended period, you should also not attempt to
> > implement direct_access.
> >
> > These block devices may be used for inspiration:
> > +
> > - brd: RAM backed block device driver
> > - dcssblk: s390 dcss block device driver
> > - pmem: NVDIMM persistent memory driver
> > @@ -55,6 +59,7 @@ Implementation Tips for Filesystem Writers
> > ------------------------------------------
> >
> > Filesystem support consists of
> > +
> > - adding support to mark inodes as being DAX by setting the S_DAX flag in
> > i_flags
> > - implementing ->read_iter and ->write_iter operations which use dax_iomap_rw()
> > @@ -127,6 +132,6 @@ by adding optional struct page support for pages under the control of
> > the driver (see CONFIG_NVDIMM_PFN in drivers/nvdimm for an example of
> > how to do this). In the non struct page cases O_DIRECT reads/writes to
> > those memory ranges from a non-DAX file will fail (note that O_DIRECT
> > -reads/writes _of a DAX file_ do work, it is the memory that is being
> > +reads/writes _of a DAX ``file_`` do work, it is the memory that is being
> > accessed that is key here). Other things that will not work in the
> > non struct page case include RDMA, sendfile() and splice().
> > diff --git a/Documentation/filesystems/ext2.rst b/Documentation/filesystems/ext2.rst
> > index d83dbbb162e2..fa416b7a5802 100644
> > --- a/Documentation/filesystems/ext2.rst
> > +++ b/Documentation/filesystems/ext2.rst
> > @@ -24,7 +24,7 @@ check=none, nocheck (*) Don't do extra checking of bitmaps on mount
> > (check=normal and check=strict options removed)
> >
> > dax Use direct access (no page cache). See
> > - Documentation/filesystems/dax.txt.
> > + Documentation/filesystems/dax.rst.
> >
> > debug Extra debugging information is sent to the
> > kernel syslog. Useful for developers.
> > diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst
> > index c4f95f76ba6a..8e3ccb4ed483 100644
> > --- a/Documentation/filesystems/index.rst
> > +++ b/Documentation/filesystems/index.rst
> > @@ -24,6 +24,7 @@ algorithms work.
> > splice
> > locking
> > directory-locking
> > + dax
> >
> > automount-support
> >
> > --
> > 2.25.2
> >
Thanks,
Mauro
