From: Carlos Maiolino <cmaiolino@redhat.com>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: linux-fsdevel@vger.kernel.org, hch@lst.de, adilger@dilger.ca,
jaegeuk@kernel.org, miklos@szeredi.hu, rpeterso@redhat.com,
linux-xfs@vger.kernel.org
Subject: Re: [PATCH 8/9] Use FIEMAP for FIBMAP calls
Date: Mon, 5 Aug 2019 12:38:37 +0200 [thread overview]
Message-ID: <20190805103835.mcketlhcxyrtko5c@pegasus.maiolino.io> (raw)
In-Reply-To: <20190802152902.GI7138@magnolia>
> > >
> > > Why doesn't this function just call fiemap_fill_kernel_extent to fill
> > > out the onstack @extent structure? We've now implemented "fill out out
> > > a struct fiemap_extent" twice.
> >
> > fiemap_fill_{user, kernel}_extent() have different purposes, and the big
> > difference is one handles a userspace pointer memory and the other don't. IIRC
> > the original proposal was some sort of sharing a single function, but then
> > Christoph suggested a new design, using different functions as callbacks.
>
> It's harder for me to tell when I don't have a branch containing the
> final product to look at,
Good, I though I was the only one having issues with it :)
You can see the work here:
https://github.com/cmaiolino/linux/commits/FIEMAP_V5
^ This already includes changes addressing your concerns as we discussed int
this thread btw.
> but I'd have thought that _fill_kernel fills
> out an in-kernel fiemap extent; and then _fill_user would declare one on
> the stack, call _fill_kernel to set the fields, and then copy_to_user?
None of those functions will declare a fiemap_extent, the fiemap extent will be
declared before (in ioctl_fiemap() or bmap_fiemap()) calling either function and
then passed to the proper callback via fieinfo.fi_cb_data. This will be a user
or a kernel memory address, and the callbacks will handle the memory accordingly.
Cheers
--
Carlos
next prev parent reply other threads:[~2019-08-05 10:38 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-31 14:12 [PATCH 0/9 V4] New ->fiemap infrastructure and ->bmap removal Carlos Maiolino
2019-07-31 14:12 ` [PATCH 1/9] fs: Enable bmap() function to properly return errors Carlos Maiolino
2019-07-31 14:12 ` [PATCH 2/9] cachefiles: drop direct usage of ->bmap method Carlos Maiolino
2019-07-31 14:12 ` [PATCH 3/9] ecryptfs: drop direct calls to ->bmap Carlos Maiolino
2019-07-31 14:12 ` [PATCH 4/9] fibmap: Use bmap instead of ->bmap method in ioctl_fibmap Carlos Maiolino
2019-07-31 23:12 ` Darrick J. Wong
2019-08-02 9:19 ` Carlos Maiolino
2019-08-02 15:14 ` Darrick J. Wong
2019-08-05 10:27 ` Carlos Maiolino
2019-08-05 15:12 ` Darrick J. Wong
2019-08-06 5:38 ` Christoph Hellwig
2019-08-06 12:07 ` Carlos Maiolino
2019-08-06 14:48 ` Darrick J. Wong
2019-08-08 7:17 ` Carlos Maiolino
2019-08-06 12:02 ` Carlos Maiolino
2019-08-06 22:41 ` Luis Chamberlain
2019-08-07 14:42 ` Darrick J. Wong
2019-08-08 7:12 ` Carlos Maiolino
2019-08-08 18:53 ` Andreas Dilger
2019-08-19 10:10 ` Carlos Maiolino
2019-07-31 14:12 ` [PATCH 5/9] fs: Move start and length fiemap fields into fiemap_extent_info Carlos Maiolino
2019-07-31 23:28 ` Darrick J. Wong
2019-08-02 9:51 ` Carlos Maiolino
2019-08-02 15:15 ` Darrick J. Wong
2019-08-05 9:40 ` Carlos Maiolino
2019-08-06 5:39 ` Christoph Hellwig
2019-07-31 14:12 ` [PATCH 6/9] iomap: Remove length and start fields from iomap_fiemap Carlos Maiolino
2019-07-31 23:24 ` Darrick J. Wong
2019-07-31 14:12 ` [PATCH 7/9] fiemap: Use a callback to fill fiemap extents Carlos Maiolino
2019-07-31 23:26 ` Darrick J. Wong
2019-07-31 14:12 ` [PATCH 8/9] Use FIEMAP for FIBMAP calls Carlos Maiolino
2019-07-31 23:22 ` Darrick J. Wong
2019-07-31 23:31 ` Darrick J. Wong
2019-08-02 13:52 ` Carlos Maiolino
2019-08-06 5:41 ` Christoph Hellwig
2019-08-02 13:48 ` Carlos Maiolino
2019-08-02 15:29 ` Darrick J. Wong
2019-08-05 10:38 ` Carlos Maiolino [this message]
2019-08-06 5:46 ` Christoph Hellwig
2019-07-31 14:12 ` [PATCH 9/9] xfs: Get rid of ->bmap Carlos Maiolino
2019-07-31 23:30 ` Darrick J. Wong
2019-08-02 10:20 ` [PATCH 0/9 V4] New ->fiemap infrastructure and ->bmap removal Carlos Maiolino
2019-08-08 8:27 [PATCH 0/9 V5] " Carlos Maiolino
2019-08-08 8:27 ` [PATCH 8/9] Use FIEMAP for FIBMAP calls Carlos Maiolino
2019-08-09 1:56 ` kbuild test robot
2019-08-14 11:18 ` Christoph Hellwig
2019-08-20 13:01 ` Carlos Maiolino
2019-08-29 7:15 ` Christoph Hellwig
2019-09-10 12:28 ` Carlos Maiolino
2019-09-16 15:58 ` Darrick J. Wong
2019-09-11 13:43 [PATCH 0/9 V6] New ->fiemap infrastructure and ->bmap removal Carlos Maiolino
2019-09-11 13:43 ` [PATCH 8/9] Use FIEMAP for FIBMAP calls Carlos Maiolino
2019-09-16 17:44 ` Darrick J. Wong
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