Question about reflink feature

DISCUSSION Darrick J. Wong 3 participants 3 messages Jul 25, 2018 – Jul 27, 2018 1 message not in the archive

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Darrick J. Wong

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2018-07-25 20:29 UTC #1 lore raw

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Quoted 9 lines · Xiao Yang

Hi Darrick,
Sorry to bother you.
Currently, all reflink tests for XFS in xfstests are skipped even if we use the lastest kernel and xfsprogs.
It seems that mkfs.xfs doesn't enable reflink by default, do you want to enable it by default in later
xfsprogs version?

It will be enabled by default when we've had a long enough period to test it and make sure it's stable for general use. That may happen some time in early 2019.

Quoted 2 lines

Shoud we enable it forcely by "mkfs.xfs -m reflink" in xfstests if mkfs.xfs supports it?

For now, yes.

--D

Quoted 5 lines

Thanks,
Xiao Yang

Xiao Yang

2018-07-27 02:54 UTC #2 lore raw

Hi Darrick,

Thanks for your explanation.

rmapbt, reflink and dedupe features will be enabled by default together?

Thanks
Xiao Yang

Quoted 28 lines · Darrick J. Wong

[add linux-xfs to cc]
Quoted 9 lines · Xiao Yang
Hi Darrick,
Sorry to bother you.
Currently, all reflink tests for XFS in xfstests are skipped even if we use the lastest kernel and xfsprogs.
It seems that mkfs.xfs doesn't enable reflink by default, do you want to enable it by default in later
xfsprogs version?
It will be enabled by default when we've had a long enough period to test it and make sure it's stable for general use. That may happen some time in early 2019.
Quoted 2 lines
Shoud we enable it forcely by "mkfs.xfs -m reflink" in xfstests if mkfs.xfs supports it?
For now, yes.
--D
Quoted 4 lines
Thanks,
Xiao Yang

Eric Sandeen

2018-07-27 05:34 UTC #3 lore raw

Quoted 5 lines · Xiao Yang

Hi Darrick,
Thanks for your explanation.
rmapbt, reflink and dedupe features will be enabled by default together?

dedup is not a "feature" of xfs by itself; rather there are userspace applications which can use clone_file_range (related to reflink) to do out of band deduplication from userspace.

I believe that rmapbt has a fair bit of performance overhead, and may not get enabled by default. Not certain about this though.

-Eric

Quoted 39 lines

Thanks
Xiao Yang
Quoted 28 lines · Darrick J. Wong
[add linux-xfs to cc]
Quoted 9 lines · Xiao Yang
Hi Darrick,
Sorry to bother you.
Currently, all reflink tests for XFS in xfstests are skipped even if we use the lastest kernel and xfsprogs.
It seems that mkfs.xfs doesn't enable reflink by default, do you want to enable it by default in later
xfsprogs version?
It will be enabled by default when we've had a long enough period to test it and make sure it's stable for general use. That may happen some time in early 2019.
Quoted 2 lines
Shoud we enable it forcely by "mkfs.xfs -m reflink" in xfstests if mkfs.xfs supports it?
For now, yes.
--D
Quoted 4 lines
Thanks,
Xiao Yang
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