On Thu, Nov 17, 2016 at 10:06:48AM +0800, Qu Wenruo wrote:
> For fs support reflink, some of them (OK, btrfs again) doesn't split
> SHARED flag for extent fiemap reporting.
>
> For example:
> 0 4K 8K
> / File1: Extent 0 \
> / \
> |<- On disk Extent-->|
> | /
> | File2 /
> Extent: 0
>
> Fs supports explicit SHARED extent reporting should report fiemap like:
> File1: 2 extents
> Extent 0-4K: SHARED
> Extent 4-8K:
> File2: 1 extents
> Extent 0-4K: SHARED
>
> Fs doesn't support explicit reporting will report fiemap like:
> File1: 1 extent
> Extent 0-8K: SHARED
> File2: 1 extent
> Extent 0-4K: SHARED
How difficult /would/ it be to fix btrfs, anyway?
--D
>
> Test case like generic/372 require explicit reporting will cause false
> alert on btrfs.
>
> Add such runtime check for that requirememt.
>
> Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
> ---
> common/reflink | 44 ++++++++++++++++++++++++++++++++++++++++++++
> tests/generic/372 | 1 +
> 2 files changed, 45 insertions(+)
>
> diff --git a/common/reflink b/common/reflink
> index 8b34046..9ada2e8 100644
> --- a/common/reflink
> +++ b/common/reflink
> @@ -78,6 +78,50 @@ _require_scratch_reflink()
> _scratch_unmount
> }
>
> +# this test requires scratch fs to report explicit SHARED flag
> +# e.g.
> +# 0 4K 8K
> +# / File1: Extent 0 \
> +# / \
> +# |<- On disk Extent-->|
> +# | /
> +# | File2 /
> +# Extent: 0
> +# Fs supports explicit SHARED extent reporting should report fiemap like:
> +# File1: 2 extents
> +# Extent 0-4K: SHARED
> +# Extent 4-8K:
> +# File2: 1 extents
> +# Extent 0-4K: SHARED
> +#
> +# Fs doesn't support explicit reporting will report fiemap like:
> +# File1: 1 extent
> +# Extent 0-8K: SHARED
> +# File2: 1 extent
> +# Extent 0-4K: SHARED
> +_require_scratch_explicit_shared_extents()
> +{
> + _require_scratch
> + _require_fiemap
> + _require_scratch_reflink
> + _require_xfs_io_command "reflink"
> + local nr_extents
> +
> + _scratch_mkfs > /dev/null
> + _scratch_mount
> +
> + _pwrite_byte 0x61 0 128k $SCRATCH_MNT/file1
> + _reflink_range $SCRATCH_MNT/file1 0 $SCRATCH_MNT/file2 0 64k
> +
> + _scratch_cycle_mount
> +
> + nr_extents=$(_count_extents $SCRATCH_MNT/file1)
> + if [ $nr_extents -eq 1 ]; then
> + _notrun "Explicit SHARED flag reporting not support by filesystem type: $FSTYP"
> + fi
> + _scratch_unmount
> +}
> +
> # this test requires the test fs support dedupe...
> _require_test_dedupe()
> {
> diff --git a/tests/generic/372 b/tests/generic/372
> index 31dff20..51a3eca 100755
> --- a/tests/generic/372
> +++ b/tests/generic/372
> @@ -47,6 +47,7 @@ _supported_os Linux
> _supported_fs generic
> _require_scratch_reflink
> _require_fiemap
> +_require_scratch_explicit_shared_extents
>
> echo "Format and mount"
> _scratch_mkfs > $seqres.full 2>&1
> --
> 2.7.4
>
>
>
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