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Re: [PATCH v6 0/3] fallocate for block devices to provide zero-out

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On Fri, Mar 4, 2016 at 4:55 PM, Darrick J. Wong <darrick.wong@oracle.com> wrote:
>
> This is a redesign of the patch series that fixes various interface
> problems with the existing "zero out this part of a block device"
> code.  BLKZEROOUT2 is gone.

I replied to two of the patches with small nits, but on the whole I
like it. The only nit that I think is serious is that you shouldn't be
requiring people to have to use FALLOC_FL_KEEP_SIZE.

If anything, you might just change that logic to say: If
FALLOC_FL_KEEP_SIZE is set, then we truncate the hole punching/zeroing
to the size of the device. So people could do something like

  fallocate(fd,
        FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
        0, ~0);

to trim the whole device (and if FALLOC_FL_KEEP_SIZE isn't set, then
the above would be an error simply because the requested hole was
bigger than the device)

            Linus

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[PATCH v6 0/3] fallocate for block devices to provide zero-out "Darrick J. Wong" <darrick.wong@oracle.com> - 2016-03-05 02:00 +0100
  [PATCH 3/3] block: implement (some of) fallocate for block devices "Darrick J. Wong" <darrick.wong@oracle.com> - 2016-03-05 02:00 +0100
    Re: [PATCH 3/3] block: implement (some of) fallocate for block devices Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-05 04:10 +0100
      Re: [PATCH 3/3] block: implement (some of) fallocate for block  devices Christoph Hellwig <hch@infradead.org> - 2016-03-05 22:00 +0100
    Re: [PATCH 3/3] block: implement (some of) fallocate for block devices Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-05 04:20 +0100
      Re: [PATCH 3/3] block: implement (some of) fallocate for block  devices Christoph Hellwig <hch@infradead.org> - 2016-03-05 22:00 +0100
  [PATCH 1/3] block: invalidate the page cache when issuing  BLKZEROOUT. "Darrick J. Wong" <darrick.wong@oracle.com> - 2016-03-05 02:00 +0100
    Re: [PATCH 1/3] block: invalidate the page cache when issuing  BLKZEROOUT. Christoph Hellwig <hch@infradead.org> - 2016-03-15 08:40 +0100
  [PATCH 2/3] block: require write_same and discard requests align to  logical block size "Darrick J. Wong" <darrick.wong@oracle.com> - 2016-03-05 02:00 +0100
    Re: [PATCH 2/3] block: require write_same and discard requests align  to logical block size Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-05 04:10 +0100
    Re: [PATCH 2/3] block: require write_same and discard requests align  to logical block size Christoph Hellwig <hch@infradead.org> - 2016-03-15 08:40 +0100
  Re: [PATCH v6 0/3] fallocate for block devices to provide zero-out Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-05 04:20 +0100

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