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

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Hi,

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.

The first patch is still a fix to the existing BLKZEROOUT ioctl to
invalidate the page cache if the zeroing command to the underlying
device succeeds.

The second patch changes the internal block device functions to reject
attempts to discard or zeroout that are not aligned to the logical
block size.  Previously, we only checked that the start/len parameters
were 512-byte aligned, which caused kernel BUG_ONs for unaligned IOs
to 4k-LBA devices.

The third patch creates an fallocate handler for block devices, wires
up the FALLOC_FL_PUNCH_HOLE flag to zeroing-discard, and connects
FALLOC_FL_ZERO_RANGE to write-same so that we can have a consistent
fallocate interface between files and block devices.

Test cases[1] for the new block device fallocate will have been
submitted to the xfstests list as generic/70[5-7], though the
numbering will change to a lower number when the API and the tests are
accepted upstream.

Comments and questions are, as always, welcome.  Patches are against
4.5-rc6.

--D

[1] https://github.com/djwong/xfstests/commit/fdc0980ef01076dfb246fd1db2511227e9f67a3f

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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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