Re: [PATCH 0/6][RFC] Introduce FALLOC_FL_ZERO_RANGE flag for fallocate

Dave Chinner
2014-02-18T08:33:48Z

On Tue, Feb 18, 2014 at 12:01:38PM +1100, Dave Chinner wrote:
> On Mon, Feb 17, 2014 at 04:08:17PM +0100, Lukas Czerner wrote:
> > Introduce new FALLOC_FL_ZERO_RANGE flag for fallocate. This has the same
> > functionality as xfs ioctl XFS_IOC_ZERO_RANGE.
> >
> > It can be used to convert a range of file to zeros preferably without
> > issuing data IO. Blocks should be preallocated for the regions that span
> > holes in the file, and the entire range is preferable converted to
> > unwritten extents - even though file system may choose to zero out the
> > extent or do whatever which will result in reading zeros from the range
> > while the range remains allocated for the file.
> >
> > This can be also used to preallocate blocks past EOF in the same way as
> > with fallocate. Flag FALLOC_FL_KEEP_SIZE which should cause the inode
> > size to remain the same.
> >
> > You can test this feature yourself using xfstests, of fallocate(1) however
> > you'll need patches for util_linux, xfsprogs and xfstests which you
> > can find here:
> >
> > http://people.redhat.com/lczerner/zero_range/
> >
> > I'll post the patches after we agree and merge the kernel functionality.
> >
> > I tested this mostly with a subset of xfstests using fsx and fsstress and
> > even with new generic/290 which is just a copy of xfs/290 usinz fzero
> > command for xfs_io instead of zero (which uses ioctl). I was testing on
> > x86_64 and ppc64 with block sizes of 1024, 2048 and 4096.
>
> You also want to convert xfs/242 to be a generic test - it uses the
> _generic_test_punch helper to test all the corner cases across
> different extent type transitions.
>
> > ./check generic/076 generic/232 generic/013 generic/070 generic/269 generic/083 generic/117 generic/068 generic/231 generic/127 generic/091 generic/075 generic/112 generic/263 generic/091 generic/075 generic/256 generic/255 generic/316 generic/300 generic/290;

FWIW. if that's a group of tests you consider good for testing
extent tree modifications, then can you create a test group for
these by adding "extent" to each of the tests in the group file?

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com